JP4299100B2 - Viscoelasticity measuring device and viscoelasticity measuring method - Google Patents

Description

  The present invention relates to a viscoelasticity measuring apparatus and a viscoelasticity measuring method for measuring a viscoelasticity of a sample using a giant magnetostrictive element, and in particular, one sample holding part of a pair of sample holding parts for holding a sample is desired. The present invention relates to a viscoelasticity analyzer and a viscoelasticity measuring method for analyzing a stress acting on the other sample holding part by deformation of a sample when it is vibrated with a waveform and measuring an index value related to the viscoelasticity of the sample.

  The viscoelasticity of an industrial material in a fluidized state is an important physical property index for appropriate process control and quality control of the industrial material. Almost all industrial materials in the fluid state are viscoelastic bodies that exhibit intermediate properties between ideal elastic bodies and Newtonian fluids.

  In normal quality evaluation, when an industrial material is in a solid or semi-solid state, a compression tensile test is performed in which the material is regarded as an ideal elastic body, and when the industrial material is fluid, the material is regarded as a Newtonian fluid. Viscosity measurement is performed (see Patent Document 1 and Patent Document 2). In quality control, the viscosity measured by viscosity measurement is effective as a physical property index for low-viscosity liquids, but is insufficient as a physical property index for medium-high viscosity liquids and structural liquids. Patent Document 1 describes a technique for measuring a nonlinear elastic modulus of a viscoelastic body, and Patent Document 2 describes a technique for measuring a nonlinear complex elastic modulus and a nonlinear complex compliance.

  The principle of dynamic viscoelasticity measurement, which is said to be optimal for quality evaluation of viscoelastic materials, will be described. In dynamic viscoelasticity measurement, stress from a material is detected by a load cell while applying a sinusoidal waveform to the material, and the storage elastic modulus and loss elastic modulus are indicators of dynamic viscoelasticity from the strain waveform and the stress waveform. Measure. Thereby, various information necessary for advanced quality control regarding the characteristics of the material can be obtained. Specifically, it is possible to obtain information on a wide range of properties related to physical properties such as viscosity, elasticity, and structural properties of materials. From the obtained information, time change (time change) characteristics and temperature change characteristics (temperature dispersion, strain dispersion, Advanced analysis such as frequency dispersion). The dynamic viscoelasticity measurement is a nondestructive measurement because it is measured by micro deformation, and both solid and liquid materials are measured.

  The conventional apparatus used for dynamic viscoelasticity measurement is very expensive, such as tens of millions of yen, and has been used for limited purposes such as research. That is, it has been difficult to widely fix the apparatus and the viscoelasticity obtained by the apparatus as a standard for quality evaluation of materials in general companies.

  Therefore, the present inventor has eagerly studied to commercialize an apparatus capable of measuring dynamic viscoelasticity with high accuracy at a low price. As a result, the present inventor is an ultra-compact and inexpensive power source having a characteristic of generating a large driving force. We focused on using magnetostrictive elements. The giant magnetostrictive element is a magnetostrictive material having a property of being deformed by a magnetic field change and a property of generating a magnetic field by the deformation. Since giant magnetostrictive elements have such properties, their use as transducers, actuators, sensors, vibration generators, micromanipulations, and the like are currently being investigated (Patent Document 3, Patent Document 4, Patent Document 5, and Patent Document). 6).

  However, the giant magnetostrictive element has a special property of hysteresis characteristics. The hysteresis characteristic is also called a hysteresis phenomenon, and refers to a phenomenon that depends on the history of the state in which a thing has passed in the past, without being determined only by the conditions under which it is currently placed. The hysteresis characteristic changes under the influence of a temperature change of the giant magnetostrictive element or a pressure change applied to the giant magnetostrictive element. The relationship between the command value given to the giant magnetostrictive element and the displacement of the giant magnetostrictive element deformed by the command value is non-linear.

  Therefore, when generating a sinusoidal vibration necessary for dynamic viscoelasticity measurement using a giant magnetostrictive element, it is very difficult to control it due to the hysteresis characteristic of the giant magnetostrictive element. Further, since the giant magnetostrictive element is mainly produced by a sintered alloy method, its magnetostrictive characteristics are not completely uniform. For these reasons, most measuring instruments using giant magnetostrictive elements have not been put into practical use or commercialized in industrial terms.

  Under such circumstances, a method for controlling a giant magnetostrictive element in consideration of hysteresis characteristics is currently being studied. For example, a method of controlling a giant magnetostrictive element using an inverse model based on the Preisach model has been studied (see Patent Document 3, Non-Patent Document 1, Non-Patent Document 2, and Non-Patent Document 3). In these methods, for each temperature condition of the giant magnetostrictive element that affects the hysteresis characteristics for each giant magnetostrictive element to be used, a database for calculating a command value for the position change using an inverse model based on the Preisach model is previously stored. The command value is created, a command value that takes into account the positional shift caused by the hysteresis characteristic is obtained by referring to the database, and the command value is input to the giant magnetostrictive element. That is, a command value for outputting the target displacement amount of the giant magnetostrictive element can be obtained by an inverse model based on the Preisach model, and the giant magnetostrictive element can be controlled in consideration of hysteresis characteristics.

JP-A-9-304268 Japanese Patent Laid-Open No. 11-201893 JP 2002-127003 A Japanese Patent Laid-Open No. 11-173968 Japanese Patent No. 3151153 International Publication No. 00/13008 Pamphlet Kenji Asano, “Study on High Functional Devices-Research on Control of Giant Magnetostrictive Actuator-”, Research Report No. 27, Ibaraki Prefectural Industrial Technology Center, p. 5-7, 1999 Kenji Asano, Katsuo Koishikawa, Hidenori Yasu, “Study on High Functional Devices -Study on Control of Giant Magnetostrictive Actuator-”, Research Report No. 28, Ibaraki Prefectural Industrial Technology Center, p. 7-8, 2000 An Hidenori, Katsuo Koishikawa, Kenji Asano, “Study on High Functional Devices -Study on Heat Generation Countermeasures for Giant Magnetostrictive Actuators-”, Research Report No. 28, Ibaraki Prefectural Industrial Technology Center, p. 5-6, 2000

However, in the case of a method of controlling a giant magnetostrictive element using an inverse model based on the Preisach model, a command to change the position for each temperature condition of the giant magnetostrictive element that affects the hysteresis characteristics for each giant magnetostrictive element used. There is a problem that it is necessary to create a database for determining values, and the creation of the database requires a lot of time and cost.
Further, in the case of a method for controlling a giant magnetostrictive element using a database, a high speed processing computer is required, so that there is a problem that the apparatus becomes expensive and large.

  As described above, it is difficult to commercialize measuring instruments using giant magnetostrictive elements, in particular viscoelasticity measuring devices using giant magnetostrictive elements, and fix dynamic viscoelasticity measurement to quality control of materials in general companies. It was not realistic.

  The present invention has been made in view of the above problems, and an object thereof is to provide a viscoelasticity measuring apparatus and a viscoelasticity measuring method that can use a giant magnetostrictive element and can reduce the size of the apparatus at low cost. .

In order to achieve such an object, the viscoelasticity measuring apparatus according to the present invention detects a stress of the sample by applying a vibration having a predetermined waveform to the sample to be measured, and an index value relating to the viscoelasticity of the sample. In the viscoelasticity measuring apparatus for calculating the magnetostrictive element, a giant magnetostrictive element that is displaced by a change in magnetic field, a giant magnetostrictive element displacing means that applies a magnetic field to the giant magnetostrictive element, and a displacement of the giant magnetostrictive element is transmitted to the sample. Displacement transmitting means, displacement amount detecting means for detecting the amount of displacement transmitted to the specimen in the vicinity of the specimen, and the giant magnetostrictive element displacing means based on a target control value for generating the predetermined waveform and control means for controlling said control means based on the control value to control the super-magnetostrictive element displacing unit, that performs feedback control so that the target control value the control value is predetermined Special To.

  This device with such characteristics has the characteristic of generating a large driving force, and uses a small and inexpensive giant magnetostrictive element as a power source, so it is compared with conventional materials such as fluid materials, gel materials, plastic pieces, etc. Thus, the range of the measurement object can be expanded to a harder sample. Since this apparatus uses a giant magnetostrictive element, the entire apparatus can be reduced in size and price.

  In addition, since this apparatus can use a general personal computer for the control value calculation means and the control means, the apparatus can be made small and inexpensive. In this apparatus, the user can freely change the parts that realize each component, and the cost of the entire apparatus can be easily reduced. In the present apparatus, the performance of the entire apparatus can be easily improved by changing the components for realizing each constituent means to the latest ones or high performance ones.

  In addition, since this apparatus calculates a control value that is a target for generating a predetermined waveform based on the displacement detected by the displacement detection means, there is a variation in the machining accuracy of the parts that realize each constituent means. Even in such a case, vibration having a predetermined waveform can be applied to the sample. This apparatus can give a vibration having a predetermined waveform to the sample without having to adjust the parts even if the parts realizing each constituent means are replaced. Even if there is a variation in the quality of the giant magnetostrictive element, this apparatus can give a vibration having a predetermined waveform to the sample without being affected by the variation.

  In addition, the present apparatus can always give a vibration having a predetermined waveform to the sample even if the temperature condition affecting the hysteresis characteristics of the giant magnetostrictive element changes during the measurement. Thereby, the index value regarding the viscoelasticity of the sample under various measurement conditions can be obtained by changing the measurement conditions such as the amplitude of the waveform, the frequency of the waveform, the sample temperature, and the outside air temperature during measurement.

Further, the viscoelasticity measuring apparatus according to the present invention is the viscoelasticity measuring apparatus described above, wherein the control means is a predetermined displacement amount / represented by the displacement amount detected by the displacement amount detection means and the predetermined waveform. The displacement amount calculated from the time relational expression is compared to determine whether the displacement amount detected by the displacement amount detection unit is acceptable, and the displacement amount is determined by the tolerance determination unit. If the displacement amount detected by the detection means is determined to be unacceptable, the displacement amount detected by the displacement amount detecting means, the control value based on the control value and the predetermined displacement-time relationship And a control value correcting means for correcting, wherein the giant magnetostrictive element displacing means is controlled based on the control value corrected by the control value correcting means.

  The control means of this apparatus having such a feature allows the detected displacement amount to be compared by comparing the detected displacement amount with a displacement amount calculated from a predetermined displacement amount / time relational expression representing a predetermined waveform. If the detected displacement amount is determined to be unacceptable, the detected displacement amount, the calculated control value, and the control value calculated based on a predetermined displacement amount / time relational expression And the giant magnetostrictive element displacing means is controlled based on the corrected control value, so that an appropriate control value for applying a predetermined waveform of vibration can be calculated. As a result, it is possible to obtain an appropriate control value for giving a vibration having a predetermined waveform without using a database. Therefore, it is possible to easily realize downsizing and cost reduction of the entire apparatus.

Further, according viscoelasticity measuring apparatus in the present invention, in a viscoelasticity measuring apparatus described above, the control value correcting means, the displacement amount detected by the displacement amount detecting means and the control value based on the control value and the displacement A control value / displacement amount relational expression creating means for creating a control value / displacement quantity relational expression representing the relationship between the quantity, the control value / displacement quantity relational expression created by the control value / displacement quantity relational expression creating means, A control value / time relational expression creating means for creating a control value / time relational expression representing the relationship between the control value and time as a target for generating the predetermined waveform based on the determined displacement / time relational expression; The control means controls the giant magnetostrictive element displacement means based on a control value calculated from the control value / time relational expression created by the control value / time relational expression creation means. .

  The control value correction means of this apparatus having such a feature creates and creates a control value / displacement amount relational expression representing the relationship between the control value and the displacement amount based on the detected displacement amount and the calculated control value. Creates a control value / time relational expression that represents the relationship between the control value and time as a target for generating a predetermined waveform based on the control value / displacement quantity relational expression and a predetermined displacement amount / time relational expression. Since the means controls the giant magnetostrictive element displacement means based on the control value calculated from the created control value / time relational expression, an appropriate control value for giving a predetermined waveform vibration is used using an existing mathematical method. Can be calculated.

The viscoelasticity measuring apparatus according to the present invention is the viscoelasticity measuring apparatus described above , wherein the waveform is any one of a sine waveform, a triangular waveform, a rectangular waveform, and a waveform obtained by combining the sine waveforms having different frequencies. It is characterized by being one.

  This device with such characteristics can give samples vibrations of various waveforms such as sinusoidal waveforms, triangular waveforms, rectangular waveforms, and composite waveforms of sinusoidal waveforms with different frequencies. It is possible to obtain an index value related to viscoelasticity. Specifically, this device can measure dynamic viscoelasticity in the case of a sine waveform, can measure the elastic modulus at various deformation rates by constant speed deformation measurement in the case of a triangular waveform, and creep in the case of a rectangular waveform. Viscoelasticity can be measured by recovery measurement. In the case of a waveform in which sinusoidal waveforms having different frequencies are combined, this apparatus can measure viscoelasticity at multiple frequencies by Fourier transform. This device can perform advanced physical property analysis by changing the frequency of each waveform. This apparatus can measure viscoelasticity by stress relaxation measurement when the amount of displacement is fixed.

The viscoelasticity measuring device according to the present invention is the viscoelasticity measuring device described above , wherein the stress detection unit detects the stress of the sample, the displacement amount detected by the displacement amount detection unit, and the stress detection. Viscoelasticity calculating means for analyzing the stress detected by the means and calculating the index value relating to the viscoelasticity of the sample.

  This apparatus having such a feature detects the stress of the sample and analyzes the detected displacement and the detected stress to calculate an index value related to the viscoelasticity of the sample. Highly accurate viscoelasticity measurement can be performed while applying a predetermined waveform of vibration.

The viscoelasticity measuring apparatus according to the present invention is the viscoelasticity measuring apparatus described above , wherein the giant magnetostrictive element displacing means includes a current supply means for supplying a current, and the current supplied from the current supply means. And a magnetic field generating means for generating a magnetic field when input, wherein the magnetostrictive element is displaced by applying the magnetic field generated by the magnetic field generating means, and the current value supplied from the current supplying means is detected. Current control means for controlling, and the control value is the current value.

  The giant magnetostrictive element displacing means of the present apparatus having such characteristics further comprises a current supply means for supplying current and a magnetic field generating means for generating a magnetic field by inputting the current supplied from the current supply means. The device is characterized in that it is displaced by applying a magnetic field generated by the magnetic field generation means, and this apparatus is equipped with a current detection means for detecting the current value supplied from the current supply means, and the control value is a current value, so that it can be easily obtained. The giant magnetostrictive element displacing means can be realized by using such a thing. Thereby, this apparatus can be made inexpensive.

The viscoelasticity measuring apparatus according to the present invention is the viscoelasticity measuring apparatus described above , wherein the giant magnetostrictive element displacing means includes a magnetic field generating means for generating a magnetic field and a moving means for moving the magnetic field generating means. And a distance detecting means for detecting a distance between the giant magnetostrictive element and the magnetic field generating means as a detection value, wherein the magnetic field generated by the magnetic field generating means is applied to the giant magnetostrictive element and displaced. And the control value is the detected value.

  The giant magnetostrictive element displacing means of the present apparatus having such characteristics further includes a magnetic field generating means for generating a magnetic field and a moving means for moving the magnetic field generating means, and is displaced by applying a magnetic field generated by the magnetic field generating means to the giant magnetostrictive element. The apparatus includes distance detection means for detecting the distance between the giant magnetostrictive element and the magnetic field generation means as a detection value, and the control value is a detection value. Giant magnetostrictive element displacement means can be realized. Thereby, this apparatus can be made inexpensive.

The present invention also relates to a viscoelasticity measuring method. The viscoelasticity measuring method according to the present invention detects a stress of the sample by applying a vibration having a predetermined waveform to the sample to be measured, and detects the viscosity of the sample. In a viscoelasticity measuring method for calculating an index value relating to elasticity, a giant magnetostrictive element that is displaced by a change in a magnetic field is displaced using a control value for generating the predetermined waveform, and the displacement of the giant magnetostrictive element is in the vicinity of a sample. The detected displacement amount is compared with the displacement amount calculated from the predetermined displacement amount / time relational expression representing the predetermined waveform to determine whether the detected displacement amount is acceptable. , when the amount of the detected displacement is determined to be unacceptable, based on the detected displacement amount and the control value, and generates a control value-displacement relation formula showing a relationship between the control value and the displacement amount was prepared The above control value / displacement relational expression And a control value / time relational expression representing a relation between a control value and a time as a target for generating the predetermined waveform based on the predetermined displacement / time relational expression, and the created control value -Displace the giant magnetostrictive element based on the control value calculated from the time relational expression, detect the displacement amount of the giant magnetostrictive element again, calculate the control value, and the calculated control value is a predetermined target control value The calculation of the control value is repeated until

  This method with such characteristics has the characteristic of generating a large driving force, and uses a small and inexpensive giant magnetostrictive element as a power source, so it is compared with conventional methods such as fluid materials, gel materials, plastic pieces, etc. Thus, the range of the measurement object can be expanded to a harder sample. According to this method, since the giant magnetostrictive element is used, the entire apparatus based on this method can be reduced in size and cost.

  Further, according to the present method, a general personal computer can be used to realize the calculation of the control value and the calculation of the control value until the target control value is reached. The device can be made small and inexpensive. According to this method, the user can freely change each component constituting the device based on this method, and the cost of the entire device can be easily reduced. According to this method, it is possible to easily improve the performance of the entire device by changing each component constituting the device based on this method to the latest or high-performance component.

  In addition, according to this method, a control value that is a target for generating a predetermined waveform is calculated based on the detected amount of displacement, so that there is a variation in the machining accuracy of each component constituting the apparatus based on this method. Even in such a case, vibration having a predetermined waveform can be applied to the sample. According to this method, even if each part constituting the apparatus based on this method is replaced, it is possible to give a vibration having a predetermined waveform to the sample without adjusting the part. According to this method, even if there is a variation in the quality of the giant magnetostrictive element, it is possible to give a vibration having a predetermined waveform to the sample without being affected by the variation.

  Further, according to this method, even if the temperature condition affecting the hysteresis characteristics of the giant magnetostrictive element changes during measurement, it is possible to always give a vibration having a predetermined waveform to the sample. Thereby, the index value regarding the viscoelasticity of the sample under various measurement conditions can be obtained by changing the measurement conditions such as the amplitude of the waveform, the frequency of the waveform, the sample temperature, and the outside air temperature during measurement.

  Since the present invention uses a small and inexpensive giant magnetostrictive element as a power source to generate a large driving force, even a harder sample such as a fluid material, a gel-like material, a plastic piece, etc. The range of the measurement object can be expanded. Since the present invention uses a giant magnetostrictive element, the entire apparatus according to the present invention can be reduced in size and price.

  Further, according to the present invention, since a general personal computer can be used for the control value calculation means and the control means, the apparatus based on the present invention can be made small and inexpensive. According to the present invention, the user can freely change the parts that realize each component of the apparatus according to the present invention, and the price of the entire apparatus can be easily reduced. According to the present invention, it is possible to easily improve the performance of the entire apparatus by changing the components for realizing each component of the apparatus based on the present invention to the latest or high-performance parts.

  Further, according to the present invention, even if there is a variation in the machining accuracy of the parts that realize each component of the apparatus based on the present invention, it is possible to give a vibration having a predetermined waveform to the sample. According to the present invention, it is possible to give a vibration having a desired waveform to a sample without having to adjust the components even if the components realizing each component means of the apparatus according to the present invention are replaced. According to the present invention, even if the quality of the giant magnetostrictive element varies, the sample can be vibrated with a predetermined waveform without being affected by the variation.

  Further, according to the present invention, even if the temperature condition that affects the hysteresis characteristics of the giant magnetostrictive element changes during the measurement, the sample can always be vibrated with a predetermined waveform. Thereby, the index value regarding the viscoelasticity of the sample under various measurement conditions can be obtained by changing the measurement conditions such as the amplitude of the waveform, the frequency of the waveform, the sample temperature, and the outside air temperature during measurement.

  In addition, according to the present invention, it is possible to obtain an appropriate control value for applying a predetermined waveform vibration without using a database, so that the entire apparatus according to the present invention can be easily reduced in size and price. can do. According to the present invention, it is possible to calculate an appropriate control value for applying a predetermined waveform of vibration using an existing mathematical method.

  Further, according to the present invention, vibrations of various waveforms such as a sine waveform, a triangular waveform, a rectangular waveform, or a waveform obtained by combining sine waveforms with different frequencies can be applied to the sample, and the viscosity of the sample with various waveforms can be applied. An index value relating to elasticity can be obtained. Specifically, according to the present invention, dynamic viscoelasticity can be measured in the case of a sinusoidal waveform, and the elastic modulus at various deformation speeds can be measured by a constant speed deformation measurement in the case of a triangular waveform. Can measure viscoelasticity by creep recovery measurement. According to the present invention, in the case of a waveform obtained by combining sinusoidal waveforms having different frequencies, it is possible to measure viscoelasticity at multiple frequencies by Fourier transform. According to the present invention, advanced physical property analysis can be performed by changing the frequency of each waveform. According to the present invention, when the amount of displacement is fixed, viscoelasticity can be measured by stress relaxation measurement.

  Hereinafter, embodiments (first embodiment and second embodiment) of the present invention will be described in detail. Note that the present invention is not limited to the embodiments.

[First Embodiment]
Hereinafter, a first embodiment of a viscoelasticity measuring apparatus of the present invention will be described with reference to the drawings. The viscoelasticity measuring apparatus according to the first embodiment uses the displacement of the giant magnetostrictive element to vibrate one sample holding part of a pair of sample holding parts holding a sample with a predetermined waveform. It has a function of measuring an index value relating to viscoelasticity of a sample by analyzing a stress acting on the other sample holding portion due to the deformation of the sample. In other words, the giant magnetostrictive element that is displaced by a change in the magnetic field is displaced using a control value for generating a predetermined waveform, and the displacement of the giant magnetostrictive element is detected in the vicinity of the sample, and based on the detected amount of displacement. Calculate a target control value for generating a predetermined waveform, displace the giant magnetostrictive element based on the calculated control value, calculate the control value by detecting the displacement of the giant magnetostrictive element again, and calculate The calculation of the control value is repeated until the obtained control value becomes a predetermined target control value.

  FIG. 1 is a diagram showing an overall configuration of the viscoelasticity measuring apparatus according to the first embodiment. The viscoelasticity measuring apparatus 10 according to the first embodiment includes a giant magnetostrictive element 100 having a property of being displaced by a change in a magnetic field, a sample holding unit 102 and a sample holding unit disposed so as to sandwich a sample 101 that is a target of viscoelasticity measurement. Unit 103, current supply unit 104 that supplies current, magnetic field generation unit 105 that generates a magnetic field by inputting the current supplied from current supply unit 104, and displacement of giant magnetostrictive element 100 is transmitted to sample holding unit 102. Displacement transmitting section 106, displacement amount detecting section 107 for detecting the amount of displacement of the sample holding section 102, stress detecting section 108 for detecting a force acting on the sample holding section 103 from the sample 101 as a stress value, and a current supplying section A current detection unit 109 that detects the current value supplied from 104, a function of controlling the displacement amount of the giant magnetostrictive element 100, and a function of measuring an index value related to the viscoelasticity of the sample 101. A computer 20, in constructed.

  The sample holding unit 102 is attached to the displacement transmitting unit 106 via the rod 110, and the sample holding unit 103 is attached to the stress detecting unit 108 via the rod 111. The magnetic field generator 105 is disposed so as to surround the outer periphery of the giant magnetostrictive element 100.

  The giant magnetostrictive element 100 is a ferromagnetic material that has a property of being deformed by a change in the magnetic field and a property of generating a magnetic field by the deformation. The sample 101 is an industrial material such as a fluid material, a gel material, or a plastic piece. As the sample holding unit 102 and the sample holding unit 103, a flat plate capable of holding the sample 101 can be used.

  The current supply unit 104 can use a variable current power supply device. The magnetic field generator 105 can be a coil that generates a magnetic field by inputting a current.

  The displacement transmitting unit 106 is configured to amplify the displacement of the giant magnetostrictive element 100 and transmit the amplified displacement to the sample holding unit 102 to vibrate the sample holding unit 102 in a shearing direction, an expansion / contraction direction, or the like. More specifically, as shown in the drawing, this is a configuration using the principle of leverage that is used as a general mechanical amplification transmission means.

  Further, the displacement amount detection unit 107 can use a strain gauge or the like that can detect the displacement amount of the sample holding unit 102. The stress detection unit 108 can use a load cell or the like that can detect a force acting on the sample holding unit 103 from the sample 101 as a stress value. The current detection unit 109 detects the current value supplied from the current supply unit 104.

  Further, the computer 20 has a function of controlling the displacement amount of the giant magnetostrictive element 100 based on at least the current value detected by the current detection unit 109 and the displacement amount detected by the displacement amount detection unit 107, and the displacement amount detection unit 107. A function of analyzing the detected displacement amount and the stress value detected by the stress detection unit 108 to measure an index value related to the viscoelasticity of the sample 101 is provided.

  In addition to the configuration of the viscoelasticity measuring apparatus 10, a configuration for controlling the temperature of the sample 101 may be provided. Specifically, the temperature of the sample 101 is detected by a thermocouple, the target temperature is calculated by comparing the detected temperature with a preset temperature, and a heater disposed in the vicinity of the sample 101 is controlled. The sample temperature may be maintained at a preset temperature. Thereby, the index value regarding the viscoelasticity of the sample under the set temperature condition can be obtained.

Here, the configuration of the computer 20 will be described with reference to FIG.
FIG. 2 is a block diagram showing the configuration of the computer 20. The computer 20 includes a control unit 201 such as a CPU that comprehensively controls the entire computer 20, a storage unit 202 that stores various databases, tables, files, and the like, and an input / output interface that connects the computer 20 to each unit described later. Unit 203, a clock generation unit 204 for measuring the system time, and an input unit 205 and an output unit 206 connected to the computer 20 main body via the input / output interface unit 203. Connected via bus. Further, the computer 20 may be communicably connected to a network via a communication device such as a router and a wired or wireless communication line such as a dedicated line.

  The storage unit 202 is a storage unit, and for example, a memory device such as a RAM or a ROM, a fixed disk device such as a hard disk, a flexible disk, an optical disk, or the like can be used.

  The input / output interface unit 203 connects the current supply unit 104, the displacement amount detection unit 107, the stress detection unit 108, the current detection unit 109, the input unit 205, and the output unit 206 to the computer 20. Here, as the output unit 206, a monitor, a printer, a speaker, or the like can be used (hereinafter, the output unit 206 is described as a monitor). As the input unit 205, a keyboard, a mouse, a microphone, or the like can be used.

  Moreover, the control part 201 is roughly provided with the giant magnetostrictive element control part 201a, the viscoelasticity measurement part 201b, and the measurement result output part 201c as shown in the figure. The control unit 201 has an internal memory for storing a control program such as an OS (Operating System), a program defining various processing procedures, and necessary data, and performs various processes based on these programs. Performs information processing for execution.

  Here, the giant magnetostrictive element control unit 201a includes an allowable determination unit 201a-1, a current / displacement amount relational expression creating unit 201a-2, and a target current / time relational expression creating unit 201a-3, and is configured to detect current. The displacement amount of the giant magnetostrictive element 100 is controlled based on the current value detected by the unit 109 and the displacement amount detected by the displacement amount detection unit 107. The allowable determination unit 201a-1 compares the displacement amount VA detected by the displacement amount detection unit 107 with a predetermined displacement amount VB, and determines whether or not the displacement amount VA is allowable (allowable range). . The displacement amount VB is a displacement amount calculated by a predetermined target displacement amount / time relational expression, and the target displacement amount / time relational expression is a target displacement amount for periodically oscillating with a predetermined waveform. And an expression representing the relationship of time. The current / displacement amount relational expression creating unit 201a-2 determines the current value detected by the current detection unit 109 and the current value detected by the current detection unit 109 when the allowable amount determination unit 201a-1 determines that the displacement amount VA is unacceptable (not within the allowable range). Based on the displacement amount VA, a current / displacement amount relational expression representing the relationship between the current value and the displacement amount is created. Specifically, the current / displacement relational expression creating unit 201a-2 determines a coefficient of a predetermined current / displacement relational expression based on the current value detected by the current detection unit 109 and the displacement VA, A current / displacement relational expression may be created. The target current / time relational expression creating unit 201a-3 is based on the predetermined target displacement / time relational expression and the current / displacement relational expression created by the current / displacement relational expression creating unit 201a-2. A target current / time relational expression representing a relation between a target current value and time for periodically oscillating with a waveform is created.

  Further, the viscoelasticity measuring unit 201b analyzes the displacement value VA and the stress value detected by the stress detecting unit 108, and measures the index value related to the viscoelasticity of the sample 101. Here, as an index value of the first embodiment, a loss elastic modulus representing viscosity and a storage elastic modulus representing elasticity are used.

  Further, the measurement result output unit 201 c outputs the index value measured by the viscoelasticity measurement unit 201 b to the output unit 206.

  Here, the control unit 201 roughly includes a giant magnetostrictive element control unit 201a, a viscoelasticity measurement unit 201b, and a measurement result output unit 201c. However, the viscoelasticity measurement unit 201b is not limited to this case. The measurement result output unit 201c may be realized by a control unit of another computer. That is, control of the giant magnetostrictive element and measurement of viscoelasticity may be realized by separate computers. The computer provided with the giant magnetostrictive element control unit 201a can be used as an apparatus for controlling the giant magnetostrictive element with various measuring instruments that use the giant magnetostrictive element.

  In the above configuration, (1-1) the basic concept of the first embodiment, (1-2) the vibration operation of the sample holder 102, (1-3) detection of the displacement amount, the current value, and the stress value, The operation will be described in the order of (1-4) displacement control of the giant magnetostrictive element, (1-5) viscoelasticity measurement, and (1-6) measurement result output. In the following description, the sample holder 102 is a flat plate A, and the sample holder 103 is a flat plate B.

(1-1) Basic concept of the first embodiment In general, a measurement apparatus using a giant magnetostrictive element transmits a displacement of the giant magnetostrictive element so that vibration applied to the sample has a desired sine waveform. Based on the idea of directly controlling the displacement of the giant magnetostrictive element and displacing the giant magnetostrictive element with a desired sine waveform. However, the method of displacement of the giant magnetostrictive element differs depending on whether it is expanded or contracted, and there is a hysteresis characteristic that the manner of displacement changes depending on the temperature condition of the giant magnetostrictive element or the pressure condition applied to the giant magnetostrictive element. It is difficult to control the displacement directly with high accuracy. Even if the giant magnetostrictive element is directly controlled with high precision so that the giant magnetostrictive element is displaced with a desired sinusoidal waveform, the desired sinusoidal vibration is applied to the sample due to the effect of transmission accuracy in the process of transmitting the displacement. Is difficult to add.

  The present inventor does not directly control the displacement of the giant magnetostrictive element in order to transmit the displacement of the giant magnetostrictive element to make the vibration applied to the specimen into a desired sinusoidal waveform, but desires a sample holder for holding the specimen. We focused on vibrating with a sinusoidal waveform. The present invention is based on the idea of controlling the displacement of the giant magnetostrictive element with high accuracy by determining a target current value for vibrating the sample holder with a desired sine waveform. Specifically, the present invention detects the amount of displacement of the sample holder, detects the current value to be supplied, and the equation representing the relationship between the amount of displacement and the current value and the sample holder vibrates in a desired sine waveform. The target current value for the sample holder to vibrate with a desired sine waveform is determined based on the expression representing the relationship between the target displacement amount and time and the detected displacement amount and the detected current value, The displacement of the giant magnetostrictive element is accurately controlled.

(1-2) Vibration Operation of Sample Holding Unit 102 (Plate A) First, the user places the sample 101 between the flat plate A and the flat plate B, and supplies current via the input unit 205 of the computer 20. An optimal current value supplied in advance by the unit 104 is set.

  When the optimal current value is set, the control unit 201 of the computer 20 outputs the set current value to the current supply unit 104 via the input / output interface unit 203. That is, the control unit 201 of the computer 20 controls the current supply unit 104 so that a current value having a set waveform is output.

  When the current value is output, the current supply unit 104 supplies a current corresponding to the current value input from the computer 20 to the magnetic field generation unit 105. The magnetic field generation unit 105 generates a magnetic field with the current supplied from the current supply unit 104.

  When the magnetic field generator 105 generates a magnetic field, the giant magnetostrictive element 100 is displaced in response to the magnetic field generated by the magnetic field generator 105. The displacement transmitting unit 106 amplifies the displacement of the giant magnetostrictive element 100 and transmits the amplified displacement to the flat plate A. As a result, the flat plate A vibrates in the shearing direction, the expansion and contraction direction, and the sample 101 is deformed by the vibration of the flat plate A. Here, the displacement transmission part 106 is a structure using the principle of leverage, which is used as a general mechanical amplification transmission means.

(1-3) Detection of Displacement Amount, Current Value, and Stress Value The current detection unit 109 detects the current value supplied by the current supply unit 104 over time, and outputs the detected current value to the computer 20. When a current value is input to the computer 20 via the input / output interface unit 203, the control unit 201 acquires the system time from the clock generation unit 204, and correlates the input current value with the acquired time. And stored in a predetermined storage area of the storage unit 202.

  On the other hand, the displacement amount detection unit 107 detects the displacement amount VA of the flat plate A over time, and outputs the displacement amount VA to the computer 20. When the displacement amount VA is input to the computer 20 via the input / output interface unit 203, the control unit 201 acquires the system time from the clock generation unit 204, and the input displacement amount VA and the acquired time are mutually obtained. And stored in a predetermined storage area of the storage unit 202.

  Further, the stress detection unit 108 detects a stress value acting on the flat plate B with time, and outputs the detected stress value to the computer 20. When a stress value is input to the computer 20 via the input / output interface unit 203, the control unit 201 acquires the system time from the clock generation unit 204, and correlates the input stress value with the acquired time. And stored in a predetermined storage area of the storage unit 202.

(1-4) Control of Displacement of Giant Magnetostrictive Element Next, control of displacement of the giant magnetostrictive element, which is a main part of the present invention, will be described.
The giant magnetostrictive element control unit 201a of the control unit 201 determines the displacement amount of the giant magnetostrictive element 100 based on the current value and the displacement amount VA detected by the current detection unit 109 so that the flat plate A periodically vibrates in a sine waveform. Control (giant magnetostrictive element control processing). Here, the details of the giant magnetostrictive element control process for controlling the displacement of the giant magnetostrictive element will be described.

FIG. 3 is a flowchart showing an example of the giant magnetostrictive element control process performed by the giant magnetostrictive element control unit 201a.
First, the allowable determination unit 201a-1 of the giant magnetostrictive element control unit 201a compares the displacement amount VA with the predetermined displacement amount VB to determine whether the displacement amount VA is allowable (step SA). -1). Specifically, it is determined whether the displacement amount VA is acceptable based on the standard error between the displacement amount VA and the predetermined displacement amount VB. Here, the displacement amount VB is a displacement amount calculated by a predetermined target displacement amount / time relational expression, and the target displacement amount / time relational expression is a target for periodically oscillating with a predetermined waveform. It is a formula showing the relationship between displacement amount and time.

  When it is determined that the determination result in step SA-2 is not within the allowable range (step SA-2: NO), the current / displacement amount relational expression creating unit 201a-2 detects the current value and the displacement amount detected by the current detection unit 109. Based on the VA, a current / displacement relational expression representing the relationship between the current value and the displacement is created, and the created current / displacement relational expression is stored in a predetermined storage area of the storage unit 202 (step SA-3). . Specifically, based on the current value detected by the current detector 109 and the displacement VA, a coefficient of a predetermined current / displacement relation is determined, and a current / displacement relation is created and created. The current / displacement relational expression is stored in a predetermined storage area of the storage unit 202. Here, as the predetermined current / displacement amount relational expression, an expression representing the relation between the current value and the displacement amount derived using the Levenberg-Marquardt method can be used. This method is based on the Levenberg-Marquardt algorithm that combines the steepest descent method with first-order convergence and the Gauss-Newton method with second-order convergence. It is a least square optimization method. Specifically, it is expressed using a nonlinear function model (a plurality of coefficients “α1, α2, α3,..., Αn” (n is a natural number)) given to the relationship of the data set (X, Y). Non-linear function: Y = f (X)) is determined to obtain a non-linear regression equation. When this method is used, a function (approximate expression) that approximately represents a nonlinear relationship such as a relationship between a current value and a displacement amount at the time of magnetostrictive behavior (displacement) of the giant magnetostrictive element 100 can be efficiently obtained. In order to consider the hysteresis characteristics of the giant magnetostrictive element 100, the phase difference between the waveform of the current value and the waveform of the displacement amount VA is taken into consideration, and the current value is increased (that is, when the giant magnetostrictive element 100 is extended) and the current. A current / displacement amount relational expression corresponding to each time the value decreases (that is, when the giant magnetostrictive element 100 contracts) may be created.

  The target current / time relational expression creating unit 201a-3 periodically generates the flat plate A in a sine waveform based on the predetermined target displacement / time relational expression and the current / displacement relational expression created in step SA-3. A target current / time relational expression representing a relation between current and time as a target for vibration is created, and the target current / time relational expression is stored in a predetermined storage area of the storage unit 202 (step SA-4). More specifically, the target current / time relational expression is created by deleting the displacement from the current / displacement relational expression and the target displacement / time relational expression, and the target current / time relational expression is stored in a predetermined storage unit 202. Store in the area.

  The giant magnetostrictive element control unit 201a controls the current supply unit 104 so that an optimal current value is output based on the target current / time relational expression created in step SA-4 (step SA-5). The giant magnetostrictive element control unit 201a executes the giant magnetostrictive element control process (steps SA-1 to SA-5) until the flat plate A periodically vibrates with a desired sine waveform. Specifically, when the optimum current value output in step SA-5 is reflected in the vibration of the flat plate A through (1-2) each vibration operation of the sample holding unit 102, the allowable determination unit 201a-. 1 performs the same determination as in step SA-1. When it is determined that the determination result in step SA-2 is within the allowable range (step SA-2: YES), the giant magnetostrictive element control unit 201a ends the process, and otherwise (step SA-2: NO). Each unit of the giant magnetostrictive element control unit 201a performs the processing of Step SA-3 to Step SA-5. Thereby, the flat plate A came to vibrate periodically with a desired sine waveform. Thus, the giant magnetostrictive element control process performed by the giant magnetostrictive element control unit 201a is completed.

  In the above-described giant magnetostrictive element control unit 201a, the waveform that periodically vibrates the flat plate A (the target waveform of the flat plate A) is set to a sine waveform. A waveform, a triangular waveform, a rectangular waveform, or the like may be set. Thereby, the flat plate A can be periodically vibrated with various waveforms, and the index value of the sample 101 in each waveform can be measured. In addition, the giant magnetostrictive element control unit 201a acquires an optimal current value corresponding to the displacement VA from a database stored in advance in a predetermined storage area of the storage unit 202, and outputs the acquired current value. The current supply unit 104 may be controlled. Here, the data base includes a target displacement amount for the flat plate A to periodically vibrate in a sinusoidal waveform for each temperature condition that affects the hysteresis characteristics for each giant magnetostrictive element 100 to be used, and The current value is stored in association with each other.

(1-5) Viscoelasticity measurement After the above-described giant magnetostrictive element control process is repeated once or a plurality of times and the flat plate A periodically oscillates in a sinusoidal waveform, the viscoelasticity measurement unit 201b detects the displacement VA. The stress value detected by the stress detection unit 108 is analyzed to measure the loss elastic modulus and storage elastic modulus of the sample 101, and the measured loss elastic modulus and storage elastic modulus are stored in a predetermined storage area of the storage unit 202. . Specifically, the storage elastic modulus and the loss elastic modulus are measured using the phase difference between the waveform of the displacement VA and the waveform of the stress value, the amplitude of the waveform of the displacement VA, and the amplitude of the waveform of the stress value.

(1-6) Measurement Result Output The measurement result output unit 201c outputs the storage elastic modulus and loss elastic modulus measured by the viscoelasticity measuring unit 201b to the monitor.
This completes the description of the operation of the viscoelasticity measuring apparatus 10.

  In the viscoelasticity measurement apparatus (viscoelasticity measurement apparatus 10) of the first embodiment, the displacement amount of the sample holding unit 102 is detected by the displacement amount detection unit 107, and the current value supplied by the current supply unit 104 is detected by the current detection unit 109. To detect. The viscoelasticity measuring device 10 represents the relationship between the displacement amount and the current value based on the detected current value and the detected displacement amount when it is determined that the displacement amount detected by the allowable determination unit 201a-1 is not within the allowable range. An expression is created by the current / displacement amount relational expression creating unit 201a-2. The viscoelasticity measuring apparatus 10 creates an expression representing a target current value and time relationship for the sample holding unit 102 to vibrate with a desired sine waveform by the target current / time relational expression creating unit 201a-3, A target current value for the holding unit 102 to vibrate with a desired sine waveform is determined. As a result, the viscoelasticity measuring apparatus 10 can accurately control the displacement of the giant magnetostrictive element 100 based on the target current value, and can vibrate the sample holder 102 with a desired sine waveform. The viscoelasticity measuring apparatus 10 can perform viscoelasticity measurement with a desired sinusoidal waveform, and can accurately measure index values relating to viscoelasticity such as storage elastic modulus and loss elastic modulus.

  In addition, the viscoelasticity measuring apparatus 10 can change the displacement of the sample holder 102 into a desired sinusoidal waveform without being affected by various effects such as parts to be used and the environment, and can perform viscoelasticity measurement with high accuracy. Specifically, (a1) when the temperature condition during measurement that affects the hysteresis characteristics of the giant magnetostrictive element 100 changes, (b1) when there is a variation (variation) in the quality of the giant magnetostrictive element 100 to be used, (c1 ) When there is a variation (variation) in the processing accuracy of each component of this apparatus, it will be described in detail separately.

  (A1) When the temperature conditions at the time of measurement that affect the hysteresis characteristics of the giant magnetostrictive element 100 change, the viscoelasticity measuring device 10 can use the sample holder in the temperature conditions at that time even if the temperature conditions change during the measurement. Since the displacement amount 102 is controlled to a desired sine waveform, viscoelasticity measurement with high accuracy can always be performed under the desired sine waveform. The viscoelasticity measuring apparatus 10 according to the first embodiment does not focus on making the displacement amount of the giant magnetostrictive element 100 having hysteresis characteristics into a desired sine waveform, but changes the displacement amount of the sample holder 102 into a desired sine waveform. Therefore, even if the giant magnetostrictive element 100 has hysteresis characteristics, the sample holder 102 can be controlled to have a desired sine waveform and desired vibration can be applied to the sample. The viscoelasticity measuring apparatus 10 having such characteristics can be used for measuring viscoelasticity of a sample under various measurement conditions such as a sinusoidal amplitude, a sinusoidal frequency, a sample temperature, and an outside air temperature. For example, the viscoelasticity measuring device 10 can easily measure the viscoelasticity of the sample at each temperature by setting the temperature during measurement to various temperatures such as 20 degrees and 30 degrees.

  (B1) When there is a variation (variation) in the quality of the giant magnetostrictive element 100 to be used, the viscoelasticity measuring apparatus 10 focuses on making the displacement amount of the sample holder 102 a desired sine waveform. Even if the quality of the giant magnetostrictive element 100 varies, it can be controlled without being affected by the variation, and the vibration of the displacement waveform in units of μm necessary for the viscoelasticity measurement can be given to the sample. Since the conventional control method is based on the premise that the quality of the giant magnetostrictive element is always strictly maintained, in the case of a measuring device based on the conventional control method, if the giant magnetostrictive element to be used is replaced, it will correspond to that element. Database information needs to be corrected.

  (C1) When there is a variation in the processing accuracy of each component of the present apparatus, the viscoelasticity measuring apparatus 10 focuses on making the displacement of the sample holder 102 into a desired sine waveform. Even if there is a variation in the processing accuracy of parts, the sample holder 102 can be controlled with a desired sine waveform to give a desired vibration to the sample. The viscoelasticity measuring device 10 controls the sample holding unit 102 with a desired sine waveform and gives a desired vibration to the sample without the need for adjusting the components as in the past even if each component used is replaced. be able to. Thereby, each component of this apparatus can be changed freely, and the price reduction of this whole apparatus can be implement | achieved easily. Further, by changing each component of the apparatus to the latest one or a high-performance one, it is possible to easily improve the performance of the entire apparatus. Since the device based on the conventional control method is based on the premise that the quality of the giant magnetostrictive element is always strictly maintained, it is easily affected by variations in the processing accuracy of each component, and each device for creating a desired sine waveform Adjustment of the component parts is very difficult.

Further, when viscoelasticity measurement is always performed under the same environmental conditions, the viscoelasticity measurement apparatus 10 can immediately perform measurement using the previously obtained target current / time relational expression. As a result, it is possible to reproduce the desired vibration without having to re-create the target current / time relational expression for making the sample holder 102 have the desired vibration, and it is possible to immediately perform highly accurate viscoelasticity measurement. .
The viscoelasticity measuring apparatus 10 controls the current supply unit 104 to output the current value calculated by the previously obtained target current / time relational expression as an initial value, and after the sample holding unit 102 has a desired vibration. Measurement may be performed, or a new target current / time relational expression may be created without using the previously obtained target current / time relational expression, and the measurement may be performed after the sample holder 102 has a desired vibration. That is, the giant magnetostrictive element control process described in FIG. 3 is executed as an initialization process at the very beginning of the day, a target current / time relational expression is created, and measurement is performed using the obtained target current / time relational expression. The measurement may be performed by executing the giant magnetostrictive element control process of FIG. 3 every time.

The viscoelasticity measuring apparatus 10 is suitable for evaluating mechanical properties such as fluid materials and gel materials in quality control, new product development, and the like. The viscoelasticity measuring device 10 is low in price (about 1/10) as compared with a conventional device used for viscoelasticity measurement, and can perform viscoelasticity measurement with high accuracy. Since the viscoelasticity measuring apparatus 10 can use a general personal computer for controlling the displacement of the giant magnetostrictive element and measuring the viscoelasticity of the sample (calculating index values related to the viscoelasticity), this apparatus is made inexpensive. be able to. Since the viscoelasticity measuring apparatus 10 uses a giant magnetostrictive element that generates a large driving force, the range of the measurement object can be expanded to a sample that is harder than the conventional one. The viscoelasticity measuring apparatus 10 has high expandability that can be used in all manufacturing industries mainly in the chemical and food industries that handle fluid materials and products, gel-like materials and products, and the like. Contributes to improvement and stabilization.
This is the end of the description of the first embodiment.

[Second Embodiment]
Hereinafter, 2nd Embodiment of the viscoelasticity measuring apparatus of this invention is described with reference to figures. Here, the viscoelasticity measuring apparatus according to the second embodiment periodically vibrates one sample holding portion of a pair of sample holding portions holding a sample with a predetermined waveform using the displacement of the giant magnetostrictive element. It has a function of analyzing the stress acting on the other sample holding portion due to deformation of the sample and measuring an index value related to the viscoelasticity of the sample. In the description of the second embodiment, the description of the same components as those in the first embodiment is omitted.

  FIG. 4 is a diagram showing an overall configuration of the viscoelasticity measuring apparatus according to the second embodiment. The viscoelasticity measuring apparatus 30 according to the second embodiment includes a giant magnetostrictive element 100 having a property of being displaced by a change in a magnetic field, a sample holding unit 102 and a sample holding unit disposed so as to sandwich a sample 101 that is a target of viscoelasticity measurement. Acting on the sample holder 103 from the sample 101, the displacement transmitting unit 106 for transmitting the displacement of the giant magnetostrictive element 100 to the sample holder 102, the displacement detecting unit 107 for detecting the displacement of the sample holder 102 A stress detecting unit 108 that detects a force to be generated as a stress value, a magnetic field generating unit 112 that generates a magnetic field, a moving unit 113 that moves the magnetic field generating unit 112, and a distance between the giant magnetostrictive element 100 and the magnetic field generating unit 112. Is detected as a detection value (hereinafter referred to as a distance value), a displacement control function of the giant magnetostrictive element 100, and an index value relating to the viscoelasticity of the sample 101 A computer 40 provided with a constant function, in constructed.

  The sample holding unit 102 is attached to the displacement transmitting unit 106 via the rod 110, and the sample holding unit 103 is attached to the stress detecting unit 108 via the rod 111. The magnetic field generator 112 is disposed in the vicinity of the giant magnetostrictive element 100.

  The magnetic field generator 112 can use a permanent magnet or the like. The moving unit 113 moves the magnetic field generating unit 112.

  The distance detection unit 114 detects a distance value between the giant magnetostrictive element 100 and the magnetic field generation unit 112.

  Further, the computer 40 has a function of controlling the displacement amount of the giant magnetostrictive element 100 based on at least the distance value detected by the distance detection unit 114 and the displacement amount detected by the displacement amount detection unit 107, and the displacement amount detection unit 107. A function of analyzing the detected displacement amount and the stress value detected by the stress detection unit 108 to measure an index value related to the viscoelasticity of the sample 101 is provided.

  In addition to the configuration of the viscoelasticity measuring device 30, a configuration for controlling the temperature of the sample 101 may be provided. Specifically, the temperature of the sample 101 is detected by a thermocouple, the target temperature is calculated by comparing the detected temperature with a preset temperature, and a heater disposed in the vicinity of the sample 101 is controlled. The sample temperature may be maintained at a preset temperature. Thereby, the index value regarding the viscoelasticity of the sample under the set temperature condition can be obtained.

Here, the configuration of the computer 40 will be described with reference to FIG.
FIG. 5 is a diagram illustrating a configuration of the computer 40. The computer 40 includes a control unit 401 such as a CPU that comprehensively controls the entire computer 40, a storage unit 402 that stores various databases, tables, files, and the like, and an input / output interface that connects the computer 40 to each unit described later. Unit 403, a clock generation unit 404 that measures the system time, and an input unit 405 and an output unit 406 that are connected to the main body of the computer 40 via the input / output interface unit 403. Connected via bus. Further, the computer 40 may be communicably connected to a network via a communication device such as a router and a wired or wireless communication line such as a dedicated line.

  The storage unit 402 is a storage unit, and for example, a memory device such as a RAM or a ROM, a fixed disk device such as a hard disk, a flexible disk, an optical disk, or the like can be used.

  The input / output interface unit 403 connects the displacement amount detection unit 107, the stress detection unit 108, the movement unit 113, the distance detection unit 114, the input unit 405 and the output unit 406 to the computer 40. Here, as the output unit 406, a monitor, a printer, a speaker, or the like can be used (hereinafter, the output unit 406 is described as a monitor). As the input unit 405, a keyboard, a mouse, a microphone, or the like can be used.

  Moreover, the control part 401 is roughly provided with the giant magnetostrictive element control part 401a, the viscoelasticity measurement part 401b, and the measurement result output part 401c as shown in the figure. The control unit 401 has a control program such as an OS (Operating System), a program that defines various processing procedures, and an internal memory for storing necessary data, and performs various processes based on these programs. Performs information processing for execution.

  Here, the giant magnetostrictive element control unit 401a includes an allowable determination unit 401a-1, a distance / displacement amount relational expression creating part 401a-2, and a target distance / time relational expression creating part 401a-3. The displacement amount of the giant magnetostrictive element 100 is controlled based on the distance value detected by the unit 114 and the displacement amount detected by the displacement amount detection unit 107. The allowable determination unit 401a-1 compares the displacement amount VA detected by the displacement amount detection unit 107 with a predetermined displacement amount VB, and determines whether or not the displacement amount VA is allowable (allowable range). . The displacement amount VB is a displacement amount calculated by a predetermined target displacement amount / time relational expression, and the target displacement amount / time relational expression is a target displacement amount for periodically oscillating with a predetermined waveform. And an expression representing the relationship of time. The distance / displacement amount relational expression creation unit 401a-2 determines the distance value detected by the distance detection unit 114 and the distance value detected by the distance detection unit 114 when the allowable determination unit 401a-1 determines that the displacement amount VA is unacceptable (not within the allowable range). Based on the displacement amount VA, a distance / displacement amount relational expression representing the relationship between the distance value and the displacement amount is created. Specifically, the distance / displacement amount relational expression creating unit 401a-2 determines a coefficient of a predetermined distance / displacement amount relational expression based on the distance value detected by the distance detection unit 114 and the displacement amount VA, A distance / displacement relational expression may be created. The target distance / time relational expression creating unit 401a-3 is based on a predetermined target displacement / time relational expression and a distance / displacement relational expression created by the distance / displacement relational relation creating unit 401a-2. A target distance / time relational expression representing a relationship between a target distance value and time for periodically oscillating with a waveform is created.

  Further, the viscoelasticity measuring unit 401b analyzes the displacement value VA and the stress value detected by the stress detecting unit 108, and measures an index value related to the viscoelasticity of the sample 101. Here, as an index value of the second embodiment, a loss elastic modulus representing viscosity and a storage elastic modulus representing elasticity are used.

  The measurement result output unit 401 c outputs the index value measured by the viscoelasticity measurement unit 401 b to the output unit 406.

  The control unit 401 roughly includes a giant magnetostrictive element control unit 401a, a viscoelasticity measurement unit 401b, and a measurement result output unit 401c. However, the viscoelasticity measurement unit 401b and the measurement result output unit 401c are not limited to this case. The measurement result output unit 401c may be realized by a control unit of another computer. That is, control of the giant magnetostrictive element and measurement of viscoelasticity may be realized by separate computers. In addition, the computer including the giant magnetostrictive element control unit 401a can be used as an apparatus for controlling the giant magnetostrictive element with various measuring instruments using the giant magnetostrictive element.

  In the above configuration, (2-1) Basic concept of the second embodiment, (2-2) Vibration operation of the sample holding unit 102, (2-3) Detection of displacement, distance value, and stress value, The operation will be described in the order of (2-4) displacement control of the giant magnetostrictive element, (2-5) viscoelasticity measurement, and (2-6) measurement result output. In the following description, the sample holder 102 is a flat plate A, and the sample holder 103 is a flat plate B.

(2-1) Basic concept of the second embodiment In general, a measurement apparatus using a giant magnetostrictive element transmits a displacement of the giant magnetostrictive element to make a vibration applied to the sample into a desired sine waveform. Based on the idea of directly controlling the displacement of the giant magnetostrictive element and displacing the giant magnetostrictive element with a desired sine waveform. However, the method of displacement of the giant magnetostrictive element differs depending on whether it is expanded or contracted, and there is a hysteresis characteristic that the manner of displacement changes depending on the temperature condition of the giant magnetostrictive element or the pressure condition applied to the giant magnetostrictive element. It is difficult to control the displacement directly with high accuracy. Even if the giant magnetostrictive element is directly controlled with high precision so that the giant magnetostrictive element is displaced with a desired sinusoidal waveform, the desired sinusoidal vibration is applied to the sample due to the effect of transmission accuracy in the process of transmitting the displacement. Is difficult to add.

  The present inventor does not directly control the displacement of the giant magnetostrictive element in order to transmit the displacement of the giant magnetostrictive element to make the vibration applied to the specimen into a desired sinusoidal waveform, but desires a sample holder for holding the specimen. We focused on vibrating with a sinusoidal waveform. The present invention is based on the concept of accurately controlling the displacement of the giant magnetostrictive element by determining the distance value between the giant magnetostrictive element and the magnetic field generating part, which is a target for vibrating the sample holder with a desired sine waveform. Is based. Specifically, the present invention detects the amount of displacement of the sample holder, detects the distance value between the giant magnetostrictive element and the magnetic field generator, and represents the relationship between the amount of displacement and the distance value and the sample holder. The target for the sample holder to vibrate with the desired sine waveform based on the expression representing the relationship between the displacement amount and the time to be vibrated with the desired sine waveform, the detected displacement amount and the detected distance value Is determined so as to accurately control the displacement of the giant magnetostrictive element.

(2-2) Vibration Operation of Sample Holding Unit 102 (Plate A) First, the user places the sample 101 between the flat plate A and the flat plate B, and moves the moving unit via the input unit 405 of the computer 40. 113 sets an optimum distance value for moving the magnetic field generator 112 in advance. That is, an optimum distance value between the giant magnetostrictive element 100 and the magnetic field generator 112 is set.

  When the optimum distance value is set, the control unit 401 of the computer 40 outputs the set distance value to the moving unit 113 via the input / output interface unit 403. That is, the control unit 401 of the computer 40 controls the moving unit 113 so that the set distance value is output.

  When the distance value is output, the moving unit 113 moves the magnetic field generating unit 112 by the distance value input from the computer 40. The magnetic field generator 112 always generates a magnetic field.

  The giant magnetostrictive element 100 is displaced in response to the magnetic field generated by the magnetic field generator 112. The displacement transmitting unit 106 amplifies the displacement of the giant magnetostrictive element 100 and transmits the amplified displacement to the flat plate A. As a result, the flat plate A vibrates in the shearing direction, the expansion and contraction direction, and the sample 101 is deformed by the vibration of the flat plate A. Here, the displacement transmission part 106 is a structure using the principle of leverage, which is used as a general mechanical amplification transmission means.

(2-3) Detection of Displacement Amount, Distance Value, and Stress Value The distance detection unit 114 detects the distance value between the giant magnetostrictive element 100 and the magnetic field generation unit 112 over time, and the detected distance value is a computer. Output to 40. When a distance value is input to the computer 40 via the input / output interface unit 403, the control unit 401 acquires the system time from the clock generation unit 404, and correlates the input distance value with the acquired time. And stored in a predetermined storage area of the storage unit 402.

  On the other hand, the displacement amount detection unit 107 detects the displacement amount VA of the flat plate A over time, and outputs the displacement amount VA to the computer 40. When the displacement amount VA is input to the computer 40 via the input / output interface unit 403, the control unit 401 acquires the system time from the clock generation unit 404, and the input displacement amount VA and the acquired time are mutually obtained. And stored in a predetermined storage area of the storage unit 402.

  Further, the stress detection unit 108 detects a stress value acting on the flat plate B with time, and outputs the detected stress value to the computer 40. When a stress value is input to the computer 40 via the input / output interface unit 403, the control unit 401 acquires the system time from the clock generation unit 404, and correlates the input stress value with the acquired time. And stored in a predetermined storage area of the storage unit 402.

(2-4) Displacement Control of Giant Magnetostrictive Element Next, control of displacement of the giant magnetostrictive element, which is a main part of the present invention, will be described.
The giant magnetostrictive element control unit 401a of the control unit 401 determines the displacement amount of the giant magnetostrictive element 100 based on the distance value and the displacement amount VA detected by the distance detection unit 114 so that the flat plate A periodically vibrates with a sine waveform. Control (giant magnetostrictive element control processing). Here, the details of the giant magnetostrictive element control process for controlling the displacement of the giant magnetostrictive element will be described.

FIG. 6 is a flowchart illustrating an example of a giant magnetostrictive element control process performed by the giant magnetostrictive element control unit 401a.
First, the allowable determination unit 401a-1 of the giant magnetostrictive element control unit 401a compares the displacement amount VA of the flat plate A detected by the displacement amount detection unit 107 with a predetermined displacement amount VB, and the displacement amount VA is allowable. (Step SB-1). Specifically, it is determined whether the displacement amount VA is acceptable based on the standard error between the displacement amount VA and the predetermined displacement amount VB. Here, the displacement amount VB is a displacement amount calculated by a predetermined target displacement amount / time relational expression, and the target displacement amount / time relational expression is a target for periodically oscillating with a predetermined waveform. It is a formula showing the relationship between displacement amount and time.

  When it is determined that the determination result in step SB-2 is not within the allowable range (step SB-2: NO), the distance / displacement amount relational expression creating unit 401a-2 detects the distance value and the displacement amount detected by the distance detection unit 114. Based on the VA, a distance / displacement amount relational expression representing the relationship between the distance value and the displacement amount is created, and the created distance / displacement quantity relational expression is stored in a predetermined storage area of the storage unit 402 (step SB-3). . Specifically, based on the distance value detected by the distance detection unit 114 and the displacement amount VA, a coefficient of a predetermined distance / displacement amount relational expression is determined, and a distance / displacement amount relational expression is created and created. The distance / displacement relational expression is stored in a predetermined storage area of the storage unit 402. Here, as the predetermined distance / displacement amount relational expression, an expression representing the relation between the distance value and the displacement amount derived by using the Levenberg-Marquardt method described in the first embodiment can be used. When this method is used, a function (approximate expression) that approximately represents a non-linear relationship such as a relationship between a distance value and a displacement amount at the time of magnetostrictive behavior (displacement) of the giant magnetostrictive element 100 can be efficiently obtained. In order to consider the hysteresis characteristics of the giant magnetostrictive element 100, the phase difference between the waveform of the distance value and the waveform of the displacement VA is taken into consideration, respectively, when the giant magnetostrictive element 100 is expanded and when the giant magnetostrictive element 100 is contracted. A distance / displacement relational expression corresponding to may be created.

  The target distance / time relational expression creating unit 401a-3 periodically generates the flat plate A with a sine waveform based on the predetermined target displacement / time relational expression and the distance / displacement relational expression created in step SB-3. A target distance / time relational expression representing a relation between a target distance value for vibration and time is created, and the target distance / time relational expression is stored in a predetermined storage area of the storage unit 402 (step SB-4). Specifically, the target distance / time relational expression is created by deleting the displacement amount from the distance / displacement quantity relational expression and the target displacement amount / time relational expression. Store in the area.

  The giant magnetostrictive element control unit 401a controls the moving unit 113 so that the optimum distance value is output based on the target distance / time relational expression created in step SB-4 (step SB-5). The giant magnetostrictive element control unit 401a executes the giant magnetostrictive element control process (step SB-1 to step SB-5) until the flat plate A periodically vibrates with a desired sine waveform. Specifically, when the optimum distance value output in step SB-5 is reflected in the vibration of the flat plate A through (2-2) the vibration operation of the sample holding unit 102, the allowable determination unit 401a-. 1 performs the same determination as in step SB-1. When it is determined that the determination result of step SB-2 is within the allowable range (step SB-2: YES), the giant magnetostrictive element control unit 401a ends the process, and otherwise (step SB-2: NO). Each part of the giant magnetostrictive element control unit 401a performs the processing of Step SB-3 to Step SB-5. Thereby, the flat plate A came to vibrate periodically with a desired sine waveform. Thus, the giant magnetostrictive element control process performed by the giant magnetostrictive element control unit 401a is completed.

  In the above-described giant magnetostrictive element control unit 401a, the waveform that periodically vibrates the flat plate A (the target waveform of the flat plate A) is set to a sine waveform. A waveform, a triangular waveform, a rectangular waveform, or the like may be set. Thereby, the flat plate A can be periodically vibrated with various waveforms, and the index value of the sample 101 in each waveform can be measured. In addition, the giant magnetostrictive element control unit 401a acquires an optimum distance value corresponding to the displacement amount VA from a database stored in advance in a predetermined storage area of the storage unit 402, and outputs the acquired distance value. The moving unit 113 may be controlled. Here, the data base includes a target displacement amount for the flat plate A to periodically vibrate in a sinusoidal waveform for each temperature condition that affects the hysteresis characteristics for each giant magnetostrictive element 100 to be used, and Stores distance values in association with each other.

(2-5) Viscoelasticity measurement After the above-described giant magnetostrictive element control process is repeated once or a plurality of times and the flat plate A periodically oscillates in a sinusoidal waveform, the viscoelasticity measurement unit 401b receives the displacement VA. The stress value detected by the stress detection unit 108 is analyzed to measure the loss elastic modulus and storage elastic modulus of the sample 101, and the measured loss elastic modulus and storage elastic modulus are stored in a predetermined storage area of the storage unit 402. . Specifically, the storage elastic modulus and the loss elastic modulus are measured using the phase difference between the waveform of the displacement VA and the waveform of the stress value, the amplitude of the waveform of the displacement VA, and the amplitude of the waveform of the stress value.

(2-6) Measurement Result Output The measurement result output unit 401c outputs the storage elastic modulus and loss elastic modulus measured by the viscoelasticity measuring unit 401b to the monitor.
This completes the description of the operation of the viscoelasticity measuring device 30.

  In the viscoelasticity measurement apparatus (viscoelasticity measurement apparatus 30) of the second embodiment, the displacement amount of the sample holding unit 102 is detected by the displacement amount detection unit 107, and the distance value between the giant magnetostrictive element 100 and the magnetic field generation unit 112 is detected. Is detected by the distance detection unit 114. The viscoelasticity measuring device 30 represents the relationship between the displacement amount and the distance value based on the detected distance value and the detected displacement amount when it is determined that the displacement amount detected by the allowable determination unit 401a-1 is not within the allowable range. The formula is created by the distance / displacement amount relation formula creating section 401a-2. The viscoelasticity measuring apparatus 30 creates an expression representing the relationship between a target distance value and time for the sample holding unit 102 to vibrate with a desired sine waveform by using the target distance / time relational expression creating unit 401a-3. A target distance value for the holding unit 102 to vibrate with a desired sine waveform is determined. As a result, the viscoelasticity measuring device 30 can accurately control the displacement of the giant magnetostrictive element 100 based on the target distance value, and can vibrate the sample holder 102 with a desired sine waveform. The viscoelasticity measuring device 30 can perform viscoelasticity measurement with a desired sinusoidal waveform, and can accurately measure index values relating to viscoelasticity such as storage elastic modulus and loss elastic modulus.

  Further, like the viscoelasticity measuring apparatus 10 of the first embodiment described above, the viscoelasticity measuring apparatus 30 changes the displacement of the sample holding unit 102 to a desired sine waveform without being affected by various factors such as parts to be used and the environment. It is possible to measure viscoelasticity with high accuracy. Specifically, (a2) when the measurement temperature conditions that affect the hysteresis characteristics of the giant magnetostrictive element 100 change, (b2) when there is a variation (variation) in the quality of the giant magnetostrictive element 100 used, (c2 ) In the case where there is a variation (variation) in the processing accuracy of each component of this apparatus, it will be described in detail separately.

  (A2) When the temperature condition at the time of measurement that affects the hysteresis characteristics of the giant magnetostrictive element 100 changes, the viscoelasticity measuring device 30 can use the sample holding unit under the temperature condition at that time even if the temperature condition changes during the measurement. Since the displacement amount 102 is controlled to a desired sine waveform, viscoelasticity measurement with high accuracy can always be performed under the desired sine waveform. The viscoelasticity measuring apparatus 30 according to the second embodiment does not focus on making the displacement amount of the giant magnetostrictive element 100 having hysteresis characteristics into a desired sine waveform, but changes the displacement amount of the sample holder 102 into a desired sine waveform. Therefore, even if the giant magnetostrictive element 100 has hysteresis characteristics, the sample holder 102 can be controlled to have a desired sine waveform and desired vibration can be applied to the sample. The viscoelasticity measuring apparatus 30 having such a feature can be used for measuring viscoelasticity of a sample under various measurement conditions such as a sinusoidal amplitude, a sinusoidal frequency, a sample temperature, and an outside air temperature. For example, the viscoelasticity measuring device 30 can easily measure the viscoelasticity of the sample at each temperature by setting the temperature at the time of measurement to various temperatures such as 20 degrees and 30 degrees.

  (B2) When there is a variation (variation) in the quality of the giant magnetostrictive element 100 to be used, the viscoelasticity measuring device 30 focuses on making the displacement amount of the sample holder 102 a desired sine waveform. Even if the quality of the giant magnetostrictive element 100 varies, it can be controlled without being affected by the variation, and the vibration of the displacement waveform in units of μm necessary for the viscoelasticity measurement can be given to the sample. Since the conventional control method is based on the premise that the quality of the giant magnetostrictive element is always strictly maintained, in the case of a measuring device based on the conventional control method, if the giant magnetostrictive element to be used is replaced, it will correspond to that element. Database information needs to be corrected.

  (C2) When there is a variation in the processing accuracy of each component of the present apparatus, the viscoelasticity measuring apparatus 30 focuses on making the displacement of the sample holder 102 into a desired sine waveform. Even if there is a variation in the processing accuracy of parts, the sample holder 102 can be controlled with a desired sine waveform to give a desired vibration to the sample. The viscoelasticity measuring device 30 controls the sample holder 102 with a desired sine waveform and gives a desired vibration to the sample without having to adjust the components as in the past even if each component used is replaced. be able to. Thereby, each component of this apparatus can be changed freely and the cost reduction of the whole apparatus can be implement | achieved easily. Further, by changing each component of the apparatus to the latest one or a high-performance one, it is possible to easily improve the performance of the entire apparatus. Since the device based on the conventional control method is based on the premise that the quality of the giant magnetostrictive element is always strictly maintained, it is easily affected by variations in the processing accuracy of each component, and each device for creating a desired sine waveform Adjustment of the component parts is very difficult.

Further, when viscoelasticity measurement is always performed under the same environmental conditions, the viscoelasticity measuring device 30 can immediately perform measurement using the previously obtained target distance / time relational expression. As a result, the desired vibration can be reproduced without having to re-create the target distance / time relational expression for making the sample holder 102 the desired vibration, and the highly accurate viscoelasticity measurement can be performed immediately. .
The viscoelasticity measuring device 30 controls the moving unit 113 to output the distance value calculated by the previously obtained target distance / time relational expression as an initial value, and the measurement is performed after the sample holding unit 102 has a desired vibration. Alternatively, a new target distance / time relational expression may be created without using the previously obtained target distance / time relational expression, and measurement may be performed after the sample holder 102 has a desired vibration. That is, the giant magnetostrictive element control process described in FIG. 6 is executed as an initialization process at the very beginning of the day, a target distance / time relational expression is created, and measurement is performed using the obtained target distance / time relational expression. The measurement may be performed by executing the giant magnetostrictive element control process of FIG. 6 every time.

The viscoelasticity measuring device 30 is suitable for evaluating mechanical properties such as fluid materials and gel materials in quality control, new product development, and the like. The viscoelasticity measuring device 30 is lower in price (about 1/10) than a conventional device used for viscoelasticity measurement, and can perform viscoelasticity measurement with high accuracy. Since the viscoelasticity measuring device 30 can use a general personal computer for controlling the displacement of the giant magnetostrictive element and measuring the viscoelasticity of the sample (calculating the index value related to the viscoelasticity), this device is made inexpensive. be able to. Since the viscoelasticity measuring device 30 uses a giant magnetostrictive element that generates a large driving force, the range of the measurement object can be expanded to a sample that is harder than before. The viscoelasticity measuring device 30 has high extensibility that it can be used in all manufacturing industries mainly in the chemical and food industries that handle fluid materials and products, gel-like materials and products, etc. Contributes to improvement and stabilization.
This is the end of the description of the second embodiment.

  As described above, the viscoelasticity measuring apparatus and the viscoelasticity measuring method according to the present invention particularly include one sample holding part of a pair of sample holding parts for holding a sample by using the displacement of the giant magnetostrictive element. An index value relating to the viscoelasticity of the sample can be measured by analyzing the stress acting on the other sample holding portion from the sample when periodically oscillating with a predetermined waveform.

  Furthermore, the viscoelasticity measuring device and the viscoelasticity measuring method according to the present invention include chemicals for handling cosmetics, paints such as paint and ink, fluid materials and products such as toothpaste, gel-like materials and products, It can be widely implemented in all manufacturing industries centering on foods and pharmaceuticals, and is extremely useful.

It is a figure showing the whole viscoelasticity measuring device composition of a 1st embodiment. 2 is a block diagram showing a configuration of a computer 20. FIG. It is a flowchart which shows an example of the current control process performed in the giant magnetostrictive element control part 201a. It is a figure which shows the whole structure of the viscoelasticity measuring apparatus of 2nd Embodiment. 2 is a block diagram showing a configuration of a computer 40. FIG. It is a flowchart which shows an example of the distance control process performed in the giant magnetostrictive element control part 401a.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10, 30 Viscoelasticity measuring apparatus 100 Giant magnetostrictive element 101 Sample 102, 103 Sample holding part 104 Current supply part 105, 112 Magnetic field generation part 106 Displacement transmission part 107 Displacement amount detection part 108 Stress detection part 109 Current detection part 110, 111 Rod 113 Moving unit 114 Distance detecting unit 20 Computer 201 Control unit
201a Giant magnetostrictive element controller
201a-1 Acceptable determination unit
201a-2 Current / displacement relational expression creation unit
201a-3 Target current / time relational expression creation unit
201b Viscoelasticity measurement unit
201c Measurement result output unit 202 Storage unit 203 Input / output interface unit 204 Clock generation unit 205 Input unit 206 Output unit 40 Computer 401 Control unit
401a Giant magnetostrictive element controller
401a-1 Acceptable determination unit
401a-2 Distance / displacement relation creation unit
401a-3 Target distance / time relational expression creation unit
401b Viscoelasticity measurement unit
401c Measurement result output unit 402 Storage unit 403 Input / output interface unit 404 Clock generation unit 405 Input unit 406 Output unit

Claims (6)

In a viscoelasticity measuring device that applies a predetermined waveform of vibration to a sample to be measured to detect the stress of the sample, and calculates an index value related to the viscoelasticity of the sample,
A giant magnetostrictive element that is displaced by a change in the magnetic field;
Giant magnetostrictive element displacing means for displacing the giant magnetostrictive element by applying a magnetic field;
Displacement transmitting means for transmitting the displacement of the giant magnetostrictive element to the sample;
A displacement amount detecting means for detecting a displacement amount transmitted to the sample in the vicinity of the sample;
Control means for controlling the giant magnetostrictive element displacing means based on a target control value for generating the predetermined waveform ;
With
The control means includes
The displacement detected by the displacement detection means can be allowed by comparing the displacement detected by the displacement detection means with a displacement calculated from a predetermined displacement / time relational expression representing the predetermined waveform. An acceptable determination means for determining whether or not
If the displacement amount detected by the displacement amount detecting means in the acceptable determining means is determined to be unacceptable, based on the displacement amount detected by the displacement amount detecting means and the control value, the control value and the displacement amount A control value / displacement relation expression creating means for creating a control value / displacement relation expression expressing the relationship between
A control value that is a target for generating the predetermined waveform based on the control value / displacement amount relational expression created by the control value / displacement amount relational expression creating means and the predetermined displacement amount / time relational expression And a control value / time relational expression creating means for creating a control value / time relational expression representing the relationship between the time and
Further comprising
The control means controls the giant magnetostrictive element displacement means based on a control value calculated from the control value / time relational expression created by the control value / time relational expression creation means, and the control value is a predetermined target. Performing feedback control so as to obtain a control value;
Viscoelasticity measuring device characterized by. The above waveform is
A sine waveform, a triangular waveform, a rectangular waveform, or a waveform obtained by combining the above sine waveforms with different frequencies,
The viscoelasticity measuring device according to claim 1. Stress detecting means for detecting the stress of the sample;
Viscoelasticity calculating means for analyzing the displacement detected by the displacement detecting means and the stress detected by the stress detecting means to calculate the index value relating to the viscoelasticity of the sample;
The viscoelasticity measuring device according to claim 1, wherein the viscoelasticity measuring device is provided. The giant magnetostrictive element displacing means is:
Current supply means for supplying current;
Magnetic field generation means for generating a magnetic field by inputting the current supplied from the current supply means;
Further comprising
Displacing the giant magnetostrictive element by applying a magnetic field generated by the magnetic field generating means;
Features
Current detection means for detecting a current value supplied from the current supply means;
With
The control value is the current value;
The viscoelasticity measuring device according to any one of claims 1 to 3. The giant magnetostrictive element displacing means is:
Magnetic field generating means for generating a magnetic field;
Moving means for moving the magnetic field generating means;
Further comprising
Displacing the giant magnetostrictive element by applying a magnetic field generated by the magnetic field generating means;
Features
Distance detecting means for detecting a distance between the giant magnetostrictive element and the magnetic field generating means as a detection value;
With
The control value is the detected value;
The viscoelasticity measuring device according to any one of claims 1 to 3. In a viscoelasticity measuring method for applying a predetermined waveform of vibration to a sample to be measured to detect the stress of the sample and calculating an index value related to the viscoelasticity of the sample,
A giant magnetostrictive element that is displaced by a change in a magnetic field is displaced using a control value for generating the predetermined waveform, the displacement of the giant magnetostrictive element is detected in the vicinity of the sample, and the detected displacement and the predetermined waveform are detected. Is compared with a displacement amount calculated from a predetermined displacement amount / time relational expression indicating whether or not the detected displacement amount is acceptable, and the detected displacement amount is determined to be unacceptable. and if the detected displacement and based on the control value, and generates a control value-displacement relation formula showing a relationship between the control value and the displacement amount, it determined the control value was created and displacement relation and the previously Based on the displacement / time relational expression, a control value / time relational expression that represents the relationship between the target control value and time for generating the predetermined waveform is created, and from the created control value / time relational expression Based on the calculated control value Displacing the element, again, repeating the calculation of the control value to detect the displacement amount of the super-magnetostrictive element to calculate the control value, calculated control value is predetermined target control value,
A method for measuring viscoelasticity.

Images