WO2017158753A1 - 測定装置および材料試験機 - Google Patents
測定装置および材料試験機 Download PDFInfo
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- WO2017158753A1 WO2017158753A1 PCT/JP2016/058264 JP2016058264W WO2017158753A1 WO 2017158753 A1 WO2017158753 A1 WO 2017158753A1 JP 2016058264 W JP2016058264 W JP 2016058264W WO 2017158753 A1 WO2017158753 A1 WO 2017158753A1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D3/00—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups
- G01D3/028—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups mitigating undesired influences, e.g. temperature, pressure
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/16—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/16—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge
- G01B7/18—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge using change in resistance
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/16—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge
- G01B7/24—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge using change in magnetic properties
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
- G01N3/06—Special adaptations of indicating or recording means
- G01N3/066—Special adaptations of indicating or recording means with electrical indicating or recording means
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
- G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
- G01D5/16—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying resistance
- G01D5/165—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying resistance by relative movement of a point of contact or actuation and a resistive track
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
- G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
- G01D5/20—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature
- G01D5/22—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature differentially influencing two coils
- G01D5/225—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature differentially influencing two coils by influencing the mutual induction between the two coils
- G01D5/2258—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature differentially influencing two coils by influencing the mutual induction between the two coils by a movable ferromagnetic element, e.g. core
- G01D5/2266—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature differentially influencing two coils by influencing the mutual induction between the two coils by a movable ferromagnetic element, e.g. core specially adapted circuits therefor
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0017—Tensile
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
Definitions
- This invention relates to a measuring apparatus and a material testing machine equipped with a detector for converting a physical quantity into an electrical signal.
- a material testing machine that performs material testing includes a load mechanism that applies a test load to the test piece, a test force detector that measures the test force applied to the test piece by the load mechanism, and a displacement meter that detects displacement generated in the test piece.
- a plurality of detectors that convert physical quantities such as forces and displacements into electrical signals are arranged. By connecting these detectors to a testing machine controller that controls the entire material testing machine via an amplifier, a physical quantity measurement system in material testing is configured (see Patent Document 1).
- This type of detector is often excited by an AC voltage, and in a receiving circuit that receives the electrical signal output from the detector, it is measured from a carrier signal modulated according to a physical quantity such as force or variation. By extracting only the signal, a signal corresponding to a change in the physical quantity is obtained.
- a detection circuit that receives an output signal of the detector and extracts a physical quantity component is provided in a control device of the material testing machine, and the detector and the amplifier are connected by a multi-core shielded wire.
- stray capacitance between core wires and between core wire and shield has been known to cause measurement errors in physical quantities.
- Patent Document 2 proposes a carrier-type strain measurement method that compensates for the effects of stray capacitance between cables. Has been.
- Equation (2) The definition range of Equation (2) is from ⁇ to + ⁇ , but in the amplifier side circuit that receives the output signal of the detector, in order to shorten the measurement interval, convolution integration with the correlation function is performed for each carrier period. And the resistance component A is extracted. That is, only the component whose phase matches sin ⁇ t in equation (1) is obtained for one period. At this time, the Fourier transform F s ( ⁇ ) is expressed by the following equation (3).
- the capacitance component B disappears by this equation (4), and only the resistance component A can be extracted. That is, the resistance component A is extracted by the following equation (5).
- the resistance component A has been obtained using Equation (5). For this reason, when the sampling frequency required in the material test is increased and a higher frequency component is to be detected, it is necessary to increase the frequency of the driving wave of the detector, that is, the carrier frequency.
- some detectors such as a differential transformer type detector, have a frequency range of the driving wave determined from the viewpoint of measurement accuracy depending on the measurement method. There was a problem that it could not be raised beyond.
- the carrier frequency is increased, the influence of the stray capacitance between the cables increases, and there is a problem that the reliability of the measured value decreases.
- the present invention has been made to solve the above-described problems, and can extract even frequency components exceeding the carrier frequency, which is a driving signal of the detector, and can grasp the fluctuation of the physical quantity detected by the detector in more detail.
- An object of the present invention is to provide a measuring device and a material testing machine.
- the invention according to claim 1 is a measuring device for measuring a change in a physical quantity generated in an object to be measured, a detector for converting the change in the physical quantity generated in the object to be measured into an electric signal and outputting the electric signal;
- a sensor amplifier that provides a sine wave having a predetermined period for driving the detector to the detector and that receives a signal output from the detector, wherein the sensor amplifier receives the sensor amplifier from the detector.
- a reception circuit that extracts a component of a physical quantity measured by the detector from a reception signal input to the reception signal, the reception circuit as a correlation function that extracts a resistance component converted from the physical quantity from the reception signal, A function including a component synchronized with a sine wave having a predetermined period and an odd harmonic component thereof is used.
- the receiving circuit uses g (t) as a received signal and G s ( ⁇ ) as one round in a carrier period of g (t). when the Fourier transform of the time, using a function including a predetermined period of the component to be synchronized with the sine wave component of the odd harmonics, extracts the resistance component a s by the following equation.
- the invention described in claim 3 is a material testing machine that includes a load mechanism that applies a test force to the test piece and executes a material test, and includes the measuring device according to claim 1 or 2.
- the measuring device includes a load cell as a detector for detecting a test force applied to the test piece, or the test It is a measuring device including a displacement meter as a detector for detecting a displacement generated in a piece.
- a sine wave having a predetermined period is used as a correlation function for extracting a resistance component converted from a physical quantity from the received signal.
- a function that includes a component that is synchronized with the odd-numbered harmonic component frequency components that exceed the carrier frequency, which is the drive signal of the detector, can be extracted, and fluctuations in physical quantities detected by the detector can be further detailed. It becomes possible to capture.
- the sampling frequency required for physical quantity measurement is increased, there is no need to increase the carrier frequency, so the effect on the measured value of the stray capacitance between cables does not increase, and the reliability of the measured value may be impaired. Absent.
- test data can be acquired at the sampling frequency required for the material test, the accuracy of the measured value of the test force by the load cell and the measured value of the elongation by the displacement meter in the material test.
- the automatic control of the operation of the material testing machine by the test force control and the displacement control can be executed smoothly.
- FIG. 2 is a block diagram illustrating a functional configuration of an FPGA 60.
- FIG. It is a graph which shows a received signal. It is a graph which shows the calculation result obtained by signal processing using conventional formula (5). It is a graph which shows the calculation result of Formula (8). It is a graph which shows a received signal. It is a graph which shows the calculation result obtained by signal processing using conventional formula (5). It is a graph which shows the calculation result of Formula (8). It is a graph which shows a capacity
- FIG. 1 is a schematic diagram of a material testing machine.
- This material testing machine is composed of a testing machine main body 1 and a control device 2.
- the testing machine main body 1 is movable along a table 16, a pair of screw rods 11 and 12 that are erected on the table 16 so as to be vertically oriented, and the screw rods 11 and 12.
- the load cell 14 and the displacement meter 15 are provided.
- the crosshead 13 is connected to a pair of screw rods 11 and 12 via nuts (ball nuts) (not shown).
- Worm speed reducers 32 and 33 in the load mechanism 30 are connected to lower ends of the screw rods 11 and 12.
- the worm speed reducers 32 and 33 are connected to a servo motor 31 that is a drive source of the load mechanism 30, and the rotation of the servo motor 31 is transferred to the pair of screw rods 11 and 12 via the worm speed reducers 32 and 33. It is configured to be transmitted.
- the crosshead 13 moves up and down along these screw rods 11 and 12.
- the upper grip 21 for holding the upper end of the test piece 10 is attached to the cross head 13.
- the table 16 is provided with a lower gripping tool 22 for gripping the lower end portion of the test piece 10.
- the test force tensile test
- the test piece 10 is applied to the test piece 10 by raising the crosshead 13 while holding both ends of the test piece 10 with the upper gripping tool 21 and the lower gripping tool 22. Force).
- the control device 2 is composed of a computer, a sequencer, and peripheral devices thereof.
- a CPU that executes logical operations, a ROM that stores an operation program necessary for controlling the device, data and the like are temporarily stored during control.
- a control panel 40 for controlling the entire apparatus.
- the control device 2 displays a load amplifier 41a which is a sensor amplifier for the load cell, a strain amplifier 41b which is a sensor amplifier for the displacement meter 15, and a displacement amount and a test force detected by the load cell 14 and the displacement meter 15.
- a display 48 is provided.
- the test force acting on the test piece 10 gripped at both ends by the upper gripping tool 21 and the lower gripping tool 22 is detected by the load cell 14 and applied to the control panel 40 via the load amplifier 41a. Entered. Further, the displacement generated in the test piece 10 is measured by the displacement meter 15 and input to the control panel 40 through the strain amplifier 41b.
- test force data and displacement amount data from the load cell 14 and the displacement meter 15 are taken in, and data processing is executed by the CPU. Further, in the control panel 40, the rotational drive of the servo motor 31 is feedback-controlled by using the test force and the displacement amount input as digital data by the operation of a control program stored in a digital circuit or ROM. .
- FIG. 2 is a schematic diagram illustrating the structure of each detector.
- FIG. 3 is a schematic configuration diagram of the measurement circuit.
- FIG. 4 is a block diagram illustrating a functional configuration of an FPGA (Field Programmable Gate Array) 60.
- the measurement circuit shown in FIG. 3 is the same for any detector shown in FIG. 2, so that the measurement circuit of the measurement apparatus will be described as a configuration of the load amplifier 41a and the strain amplifier 41b.
- the sensor amplifier 41 is referred to.
- the load cell 14 is a strain gauge type detector that measures the test force by using the change in the electrical resistance of the strain gauge. As shown in FIG. 2A, strain gauges R1 to R4 having the same resistance value are connected. Equipped with a bridge circuit.
- the displacement meter 15 includes a strain gauge displacement meter, a differential transformer displacement meter, and a potentiometer displacement meter depending on the measurement method, and is selected according to the content of the test. Similar to the load cell 14, the strain gauge displacement meter includes a bridge circuit shown in FIG. As shown in FIG. 2B, the differential transformer displacement meter includes a primary coil T1, secondary coils T2A and T2B, and an iron core MC that moves in conjunction with the elongation of the test piece 10. A detector that obtains a voltage output corresponding to the displacement by utilizing a difference according to the position of the iron core MC between the induced voltage of the secondary coil T2A and the secondary coil T2B generated when the coil is excited It is. Further, as shown in FIG.
- the potentiometer type displacement meter is a detector that includes a resistor TR and a wiper WP and converts a relative displacement amount of the resistor TR and the wiper WP into a voltage output.
- the Sig- of the potentiometer displacement meter is connected to the signal ground.
- the input ends EX + and EX ⁇ and the output ends Sig + and Sig ⁇ of each detector shown in FIG. 2 are connected to corresponding connection ends of the cable unit 24, respectively.
- the sensor amplifier 41 includes an instrumentation amplifier 56, an LPF (low-pass filter) 57, an ADC (analog / digital converter) 58, a DAC (digital / analog converter) 51, operational amplifiers 52 and 54, power amplifiers 53 and 55, and an FPGA 60. With digital circuit. Waveform data to be sent from the FPGA 60 to the DAC 51 is stored in the FPGA 60, and a detection circuit 61 that extracts a signal component of a test force value and an extension value from the signal input from the ADC 58, an offset subtractor 68, and gain multiplication A device 69 is constructed as a logic circuit. The detection circuit 61 extracts a resistance component proportional to the test force and the displacement by using Equation (8) described later.
- the offset subtracter 68 subtracts the offset value indicating the steady state at the start of the test of the test force value and the elongation value from the digital data that has passed through the detection circuit 61.
- the gain multiplier 69 is for adjusting the gain difference according to the detector.
- an FPGA is used as an element for realizing a logic circuit that processes a digital signal.
- another PLD Programmable Logic Device
- a microcomputer may be used.
- the receiving circuit is constituted by the analog circuits up to the instrumentation amplifier 56, the LPF 57 and the ADC 58, and the detection circuit 61 of the FPGA 60, the offset subtractor 68 and the gain multiplier 69.
- the detector and the sensor amplifier 41 are connected by a cable unit 24.
- the cable unit 24 includes a nonvolatile memory 25 that stores information on the type of each detector and related information (model, full scale, etc.).
- the waveform signal of the drive voltage input to the input terminals EX + and EX ⁇ of each detector is transmitted.
- the waveform generated from the DAC 51 is input to the operational amplifiers 52 and 54, converted into a drive waveform that is subject to plus or minus around zero volts, amplified by the power amplifiers 53 and 55, and supplied to the detector as an excitation signal.
- the signals output from the detector output terminals Sig + and Sig ⁇ are input to the instrumentation amplifier 56, and the difference is extracted. Then, after the component exceeding the Nyquist frequency of the ADC 58 is removed by the LPF 57, it is converted into a digital signal by the ADC 58 and input to the FPGA 60.
- the test force value or the elongation value (displacement amount) of the test piece 10 is displayed on the display 48 via the control panel 40.
- the detector is driven by a sine wave having a predetermined period, and Fourier transform is used to extract force and displacement components from the received signal.
- the received signal g (t) is expressed by the following equation (6), and its Fourier transform G s ( ⁇ ) is defined by the equation (7).
- the resistance component A s which is proportional to the magnitude of the displacement occurring in the test force or specimen 10 is given to the test piece 10.
- the signal for driving the detector is a single frequency sine wave, but the signal output from the detector is a signal whose drive signal is amplitude-modulated by a change in the state of the detector (here, a displacement). Become. Therefore, the signal output from the detector includes a displacement frequency in addition to the frequency of the drive signal.
- the resistance component A is written as a function of time with A (t) for the following reason.
- the resistance component A is a component whose phase difference with respect to the drive signal to the detector is zero, but it means that the magnitude of this value changing with time cannot be ignored.
- the calculation means of the present invention A s is A s because it is not possible to reproduce completely g (t) is not the function of g (t) or t.
- Equation (6) A (t) is a resistance component and B is a capacitance component. Further, 2k + 1 in Equation (7) and Equation (8) is the order of the harmonic.
- FIG. 5 is a graph showing a received signal
- FIG. 6 is a graph showing a calculation result obtained by signal processing using the conventional equation (5)
- FIG. 7 is a graph showing the calculation result of Expression (8).
- the vertical axis of the graph indicates displacement (mm: millimeter)
- the horizontal axis indicates time (ms: millisecond)
- the measurement points are indicated by white circles.
- the received signal in FIG. 5 assumes a waveform when the core MC of the differential transformer displacement meter moves from 0 to 1 mm (millimeter) within a certain time (10 milliseconds) and returns to the 0 position again. is doing.
- the assumed waveform of FIG. 6 is the received signal f (t) in the conventional equation (1)
- the calculation of the resistance component A obtained by the conventional equation (5) uses the conventional equation (3). For this reason, it is performed only once per cycle of the carrier frequency. For this reason, when the carrier frequency is 2 kHz, calculation is performed only every 500 microseconds even if the sampling frequency is 100 kHz. Therefore, in the conventional signal processing method, as shown in FIG. 6, the measurement points of displacement are sparse.
- the calculation according to the equations (7) and (8) is performed.
- a calculation result is obtained every sampling period (10 microseconds). That is, 50 times as many measurement points as in the prior art can be obtained. Therefore, the graph showing the change in displacement over a fixed time is a smooth graph with continuous measurement points as shown in FIG.
- FIG. 8 to 10 show waveforms when amplitude modulation is performed with a rectangular wave.
- FIG. 8 is a graph showing a received signal
- FIG. 9 is a graph showing a calculation result obtained by signal processing using the conventional equation (5).
- FIG. 10 is a graph showing the calculation result of Expression (8).
- the vertical axis of the graph indicates displacement (mm)
- the horizontal axis indicates time (ms)
- measurement points are indicated by white circles.
- the resistance component A is calculated once per cycle of the carrier frequency. As shown in FIG. 9, the measurement points of displacement are sparse.
- Equation (8) the measurement results as shown in the graphs of FIGS. 7 and 10 become smoother as the number of n is increased (the order is increased) in Equation (8).
- FIG. 11 is a graph showing the capacitance component.
- FIG. 12 shows the calculation result of Expression (8).
- the vertical axis of the graph indicates displacement (mm)
- the horizontal axis indicates time (ms)
- measurement points are indicated by white circles.
- the received signal Since the capacitive component is a component that is not proportional to the displacement and is parasitic in the circuit, the received signal has a waveform as shown in FIG.
- FIG. 13 is a graph showing the correlation function used in Equation (8).
- the vertical axis of the graph is the correlation function
- the horizontal axis is the time (ms).
- the correlation functions in the case where n in Equation (8) is 1, 3, and 5 are indicated by different line types.
- the correlation function used in the conventional equation (5) is the same, and therefore, the conventional correlation function is illustrated in the graph as an example.
- n in Equation (8) is selected from 2 to 5 (odd order harmonics up to 3 to 9) from the range of the sampling frequency required in the type of detector and the material test. Is preferred.
- a function including not only a component synchronized with a sine wave (carrier frequency) of a predetermined period but also a component of the odd-order harmonic in the correlation function of Expression (8) it is possible to obtain a calculation result of the resistance component a s at short time intervals.
- the measurement result can be obtained for each sampling period of the sampling frequency required for the material test. There is no need to increase the carrier frequency to capture 10 fast changes. Since the carrier frequency can be determined as an appropriate frequency according to the type of detector, even if it is a material testing machine including any displacement meter 15 having different measurement methods as shown in FIGS. 2 (a) to (c), It becomes possible to acquire test data at the sampling frequency required for material testing.
Abstract
Description
2 制御装置
10 試験片
11 ねじ棹
12 ねじ棹
13 クロスヘッド
14 ロードセル
15 変位計
16 テーブル
21 上つかみ具
22 下つかみ具
24 ケーブルユニット
25 不揮発性メモリ
30 負荷機構
31 サーボモータ
32 ウォーム減速機
33 ウォーム減速機
40 制御盤
41 センサアンプ
48 表示器
51 DAC
52 オペアンプ
53 パワーアンプ
54 オペアンプ
55 パワーアンプ
56 計装アンプ
57 LPF
58 ADC
60 FPGA
61 検波回路
68 オフセット減算器
69 ゲイン調整器
Claims (4)
- 被測定物に生じた物理量の変化を測定する測定装置であって、
前記被測定物に生じた物理量の変化を電気信号に変換して出力する検出器と、
前記検出器を駆動する所定の周期の正弦波を前記検出器に与えるとともに、前記検出器から出力される信号を受信するセンサアンプと、
を備え、
前記センサアンプは、
前記検出器から前記センサアンプに入力された受信信号から前記検出器で測定する物理量の成分を抽出する受信回路を有し、
前記受信回路は、
前記受信信号から前記物理量から変換された抵抗成分を抽出する相関関数として、前記所定の周期の正弦波に同期する成分とその奇数次高調波の成分とを含む関数を用いることを特徴とする測定装置。 - 試験片に試験力を与える負荷機構を備え、材料試験を実行する材料試験機であって、
請求項1または請求項2に記載の測定装置を備えることを特徴とする材料試験機。 - 請求項3に記載の材料試験機において、
前記測定装置は、前記試験片に与えられた試験力を検出する検出器としてロードセルを含む測定装置、または、前記試験片に生じた変位を検出する検出器として変位計を含む測定装置である材料試験機。
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2018505130A JP6516063B2 (ja) | 2016-03-16 | 2016-03-16 | 測定装置および材料試験機 |
CN201680065251.5A CN108351285B (zh) | 2016-03-16 | 2016-03-16 | 测量装置及材料试验机 |
EP16894371.0A EP3431958B1 (en) | 2016-03-16 | 2016-03-16 | Measurement device and material tester |
PCT/JP2016/058264 WO2017158753A1 (ja) | 2016-03-16 | 2016-03-16 | 測定装置および材料試験機 |
US16/061,406 US11360008B2 (en) | 2016-03-16 | 2016-03-16 | Measurement device and material, tester |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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PCT/JP2016/058264 WO2017158753A1 (ja) | 2016-03-16 | 2016-03-16 | 測定装置および材料試験機 |
Publications (1)
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WO2017158753A1 true WO2017158753A1 (ja) | 2017-09-21 |
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US (1) | US11360008B2 (ja) |
EP (1) | EP3431958B1 (ja) |
JP (1) | JP6516063B2 (ja) |
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EP3575771A1 (en) * | 2018-05-30 | 2019-12-04 | Shimadzu Corporation | Material testing machine |
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WO2020129283A1 (ja) * | 2018-12-21 | 2020-06-25 | 株式会社島津製作所 | 材料試験機、及び材料試験機の制御方法 |
Citations (3)
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JPH06273191A (ja) * | 1993-03-18 | 1994-09-30 | Mitsutoyo Corp | 変位検出装置 |
JPH09222336A (ja) * | 1996-02-19 | 1997-08-26 | Ribetsukusu:Kk | 検出器用検波方式とサーボ制御システム |
US5774366A (en) * | 1995-06-22 | 1998-06-30 | Beckwith; Robert W. | Method for obtaining the fundamental and odd harmonic components of AC signals |
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JPH0817552A (ja) * | 1994-06-30 | 1996-01-19 | Mitsubishi Electric Corp | 避雷器の劣化検出装置 |
US6377845B1 (en) * | 2000-07-25 | 2002-04-23 | Datascope Investment Corp. | Method and device for sensing impedance respiration |
JP3792229B2 (ja) | 2004-01-08 | 2006-07-05 | 株式会社東京測器研究所 | 搬送波型ひずみ測定方法 |
JP4697433B2 (ja) | 2006-02-17 | 2011-06-08 | 株式会社島津製作所 | 材料試験機 |
JP4807207B2 (ja) * | 2006-09-22 | 2011-11-02 | 株式会社島津製作所 | 測定装置および材料試験機 |
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- 2016-03-16 WO PCT/JP2016/058264 patent/WO2017158753A1/ja active Application Filing
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Patent Citations (3)
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JPH06273191A (ja) * | 1993-03-18 | 1994-09-30 | Mitsutoyo Corp | 変位検出装置 |
US5774366A (en) * | 1995-06-22 | 1998-06-30 | Beckwith; Robert W. | Method for obtaining the fundamental and odd harmonic components of AC signals |
JPH09222336A (ja) * | 1996-02-19 | 1997-08-26 | Ribetsukusu:Kk | 検出器用検波方式とサーボ制御システム |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
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EP3575771A1 (en) * | 2018-05-30 | 2019-12-04 | Shimadzu Corporation | Material testing machine |
JP2019207192A (ja) * | 2018-05-30 | 2019-12-05 | 株式会社島津製作所 | 材料試験機 |
US10876940B2 (en) | 2018-05-30 | 2020-12-29 | Shimadzu Corporation | Material testing machine with a control device for cable disconnection warning |
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JPWO2017158753A1 (ja) | 2018-07-26 |
JP6516063B2 (ja) | 2019-05-22 |
CN108351285A (zh) | 2018-07-31 |
EP3431958A1 (en) | 2019-01-23 |
US20200264081A1 (en) | 2020-08-20 |
EP3431958A4 (en) | 2019-10-23 |
US11360008B2 (en) | 2022-06-14 |
EP3431958B1 (en) | 2021-02-24 |
CN108351285B (zh) | 2021-09-24 |
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