JP7475076B2 - Vibration capability prediction and evaluation device, vibration capability prediction and evaluation method, and vibration capability prediction and evaluation program for vibration testing - Google Patents

Description

The present invention relates to a vibration capacity prediction and evaluation device, a vibration capacity prediction and evaluation method, and a vibration capacity prediction and evaluation program that can select an appropriate vibration test device and quickly and reliably determine whether or not a vibration test can be performed when performing vibration tests such as vibration characteristic tests and durability tests of industrial products.

Conventionally, vibration testing has been carried out using vibration testing equipment to perform vibration characteristic tests and durability tests on industrial products such as aerospace equipment, automotive equipment, electronics products, and precision instruments.

A vibration testing apparatus 100 for performing vibration testing has, for example, a movable portion 102 on which a test subject T is mounted, and a fixed portion 114 having a magnetic path member 116, as shown in FIG.
The fixed portion 114 includes a magnetic path member 116 made of a magnetically permeable material such as iron, and an excitation coil 118 that generates a magnetic flux flowing through the magnetic path member 116. The excitation coil 118 causes a constant magnetic flux to flow through the magnetic path member 116 by applying a DC voltage from a constant voltage source (not shown).

On the other hand, the movable part 102 includes a test stand 104 on which the test subject T is mounted, a movable part support spring 106 that connects the movable part 102 to the fixed part 114 and holds the movable part 102 in a movable state, and a drive coil 108 that is inserted into the gap of the magnetic path member 116.

The drive coil 108 is attached so as to be perpendicular to the magnetic field (static magnetic field) generated by the excitation coil 118, and the movable part 102 can be vibrated by passing an alternating current through the drive coil 108. The magnitude of the vibration (excitation force) generated can be controlled by changing the magnitude of the alternating current passed through the drive coil 108.

When performing a random vibration test on the test subject T using such a vibration test device 100, the AC current applied to the drive coil 108 is applied to the drive coil 108 as an electrical signal based on a PSD (power spectral density) profile corresponding to the vibration test pattern given to the test subject T. Also, when performing a sine vibration test or a shock vibration test, an AC current is applied to the drive coil 108 as an electrical signal based on information related to the vibration test pattern.

The acceleration, velocity, excitation force, displacement, etc. generated by the vibration test device 100 are acquired using an acceleration pickup 105 provided on the test stand 104.

In the case of random vibration testing, the PSD profile of the test conditions is a spectral density function that indicates the acceleration per unit frequency width, but if the distribution is uneven, it is not possible to grasp the excitation force generated by the vibration testing device 100. For this reason, it is not possible to immediately grasp what specifications of the vibration testing device should be used to perform the vibration test, or whether the vibration testing can be performed with the vibration testing device that one owns.

In addition, in the case of sine vibration testing and shock vibration testing, just like random vibration testing, the current and voltage that need to be applied to the vibration testing equipment differ depending on the frequency band required for the vibration testing, and it is difficult to determine the exact current and voltage required for the vibration testing, so it was not possible to immediately determine whether the vibration testing could be performed with the vibration testing equipment that one owns.

For this reason, conventionally, for example, by setting the capacity of the test conditions to 50% and operating each vibration test device 100, vibration specifications such as maximum excitation force, maximum acceleration, and maximum displacement are calculated from the values of the applied voltage and current input to the drive coil 108 of the vibration test device 100, and the calculated vibration specifications are compared with the specifications of the actual vibration test device to select a vibration test device and determine whether the desired vibration test can be performed with the vibration test device owned.

In view of the current situation, the present invention aims to provide a vibration capacity prediction and evaluation device, a vibration capacity prediction and evaluation method, and a vibration capacity prediction and evaluation program that can predict the vibration specifications required for a vibration test based on information about the test object and information about the vibration test pattern, and can quickly and reliably select a vibration test device and quickly and reliably determine whether a vibration test can be performed with an existing vibration test device.

The present invention has been invented to solve the problems of the conventional technology as described above, and the vibration capability prediction and evaluation device of the present invention is a vibration capability prediction and evaluation device that predicts and evaluates the vibration capability required in a vibration test, and is a means for predicting and evaluating the vibration capability based on the mass of the test subject and information on the vibration test conditions, and is equipped with a calculation means for calculating the output current effective value or the output voltage effective value as the vibration capability based on a value obtained by multiplying the difference between a first transfer characteristic, which is the transfer characteristic of the mass of only the movable part on which the test subject can be mounted, and a second transfer characteristic, which is the transfer characteristic when a load of a predetermined mass is mounted on the movable part, measured in advance for each of one or more vibration test devices in all frequency ranges, by the ratio of the mass of the test subject to the predetermined mass, and information on the vibration test conditions.

In such a vibration capacity prediction and evaluation device, the calculation means can be configured to determine whether or not it is possible to perform the vibration test based on the specifications of the vibration test device and the calculated vibration capacity.

In this case, a storage means may be provided for storing the specifications of the vibration testing device.
The vibration testing apparatus may further comprise a storage means for storing data relating to changes in the transmission characteristics of the vibration testing apparatus.

The vibration capability prediction and evaluation method of the present invention is a vibration capability prediction and evaluation method for predicting and evaluating the vibration capability required in a vibration test, and includes a step of predicting and evaluating the vibration capability based on the mass of the test subject and information on the vibration test conditions, and includes a step of calculating an output current effective value or an output voltage effective value as the vibration capability based on a value obtained by multiplying the difference between a first transfer characteristic, which is the transfer characteristic of the mass of only the movable part on which the test subject can be mounted, and a second transfer characteristic, which is the transfer characteristic when a load of a predetermined mass is mounted on the movable part, measured in advance for each of one or more vibration test devices in all frequency ranges, by the ratio of the mass of the test subject to the predetermined mass, and information on the vibration test conditions.

In this vibration capacity prediction and evaluation method, it is possible to determine whether or not the vibration test can be performed based on the specifications of the vibration test device and the calculated vibration capacity.

The vibration capacity prediction and evaluation program of the present invention is a program for executing any of the vibration capacity prediction and evaluation methods described above by a computer.

Furthermore, a computer-readable recording medium having such a program recorded thereon is also included as an aspect of the present invention.

According to the present invention, it is possible to predict the excitation specifications required for a vibration test based on information about the test object and information about the vibration test conditions, and to easily compare the specifications with those of multiple vibration test devices. This makes it possible to quickly and reliably select a vibration test device and determine whether the desired vibration test can be performed with the vibration test device that is owned.

FIG. 1 is a schematic diagram for explaining a configuration for predicting and evaluating the vibration capability of a vibration testing apparatus using a vibration capability predictive evaluation apparatus of the present invention. FIG. 2 is a flow chart for explaining a flow for obtaining a judgment result as to whether or not a vibration test can be performed using the vibration excitation capability prediction and evaluation device of this embodiment. FIG. 3 is a schematic diagram for explaining an example of a vibration testing device.

Hereinafter, embodiments (examples) of the present invention will be described in more detail with reference to the drawings.
FIG. 1 is a schematic diagram for explaining a configuration for predicting and evaluating the vibration capability of a vibration testing apparatus using a vibration capability predictive evaluation apparatus of the present invention.

The vibration test device 100 used in this embodiment has a similar configuration to the conventional vibration test device 100 described above, so the same components are given the same reference numerals and detailed descriptions thereof are omitted. Note that in this embodiment, an electrodynamic vibration test device is given as an example of the vibration test device 100, but an induction type vibration test device can also be used in the same way.

In addition, in this embodiment, a random vibration test using the vibration test device 100 is described as an example, but other vibration tests, such as sine vibration tests and shock vibration tests, can also be performed in the same way.

The vibration performance prediction and evaluation device 10 of this embodiment is configured by a computer system having an input/output means 12, a calculation means 14, and a storage means 16. The computer system may be a stand-alone computer, or may be a client-server system, a WEB system, or the like.

The storage means 16 of the vibration capacity prediction evaluation device 10 stores a vibration capacity prediction evaluation program for predicting and evaluating the vibration capacity of the vibration test device 100 as described below, and is configured to calculate the vibration capacity of the vibration test device 100 based on vibration test conditions including information about the test subject input by the user and information about the vibration test pattern.

In addition, the vibration performance prediction and evaluation device 10 of this embodiment stores the specifications of the vibration test device 100 and data related to the transfer characteristics of the vibration test device 100 acquired in advance in the storage means 16. However, the specifications of the vibration test device 100 and data related to the transfer characteristics can also be configured so that the user can input the data using the input/output means 12 (e.g., a keyboard, a mouse, etc.).

Specifications of the vibration testing device 100 may include, for example, the maximum excitation force and frequency range in the vertical and horizontal directions, the maximum acceleration, the maximum speed, the maximum displacement, the maximum load mass, and the weight and size of the test stand 104. On the other hand, data regarding the transmission characteristics of the vibration testing device 100 can be obtained as follows.

First, a vibration test is performed under specified vibration conditions without placing anything on the test stand 104 of the vibration test device 100, i.e., in an unloaded state (mass m0), and the acceleration pickup 105 is used to obtain the vibration force and acceleration generated on the test stand 104, thereby obtaining the transmission characteristics during the vibration test.

Next, a vibration test is performed under the same vibration conditions with a load of any mass m1 placed on the test stand 104 of the vibration test device 100, and the transfer characteristics at this time are obtained. Here, examples of transfer characteristics that can be used include the output voltage transfer ratio (output voltage PSD/test target acceleration PSD), which is the ratio between the measured output voltage PSD and the test target acceleration PSD, and the output current transfer ratio (output current PSD/test target acceleration PSD), which is the ratio between the measured output current PSD and the test target acceleration PSD.

In this way, by performing a vibration test under the same vibration conditions with masses m0 and m1, the transfer characteristics change according to the difference in mass. Therefore, the transfer characteristics, output voltage transfer ratio VTm0 at no load, output voltage transfer ratio VTm1 when a load of any mass m1 is mounted, output current transfer ratio CTm0 at no load, and output current transfer ratio CTm1 when a load of any mass m1 is mounted, are obtained for each vibration test device 100, and the vibration test device 100 and the transfer characteristics are associated and stored in the vibration performance prediction and evaluation device 10.

In addition, it is preferable to obtain the damping constant specific to the vibration testing device 100 in advance as a transfer characteristic. For example, the damping constant can be calculated from the displacement at the time when the signal input is stopped after a sine vibration signal is input to the vibration testing device 100, and the displacement after a predetermined time has elapsed since the signal input was stopped. However, if there is not a large difference in the damping constant of each vibration testing device, it is not necessary to obtain the damping constant for each vibration testing device.

The excitation conditions for obtaining the transfer characteristics in this way are preferably set so that all vibration test devices for which the transfer characteristics are to be obtained can be excited under the same conditions.

Using the vibration capability prediction and evaluation device 10 configured in this manner, a user can determine whether or not a vibration test can be performed under any vibration conditions on any test subject T, as follows:

Figure 2 is a flowchart for explaining the process for obtaining a judgment result as to whether or not a vibration test can be performed using the vibration capability prediction and evaluation device 10 of this embodiment.

First, the user selects the vibration testing device 100 for which the vibration capacity is to be predicted and evaluated (S1). In this embodiment, the specifications of each vibration testing device 100 are stored in advance in the vibration capacity prediction and evaluation device 10, and the user is configured to use the input/output means to select from among those displayed on the display means of the vibration capacity prediction and evaluation device 10. However, the specifications of the vibration testing device 100 for which the vibration capacity is to be predicted and evaluated can also be input to the vibration capacity prediction and evaluation device 10 using the input/output means.

Next, the mass mr of the test object T is input using the input/output means as information about the test object (S2). Furthermore, the test conditions required for the vibration test are input using the input/output means as information about the vibration test conditions (S3). The vibration capability prediction and evaluation device 10 calculates the vibration capability based on the input test conditions (S4).

The test conditions entered in S3 and the calculation of the vibration capacity performed in S4 differ depending on whether the test is a random vibration test, a sine vibration test, or a shock vibration test. Specifically, the test conditions are entered as follows, and the vibration capacity is calculated.

(1) In the Case of Random Vibration Test When a random vibration test is performed, a test target acceleration PSD profile is input as a test condition.

When a test object T of mass mr is placed on the test stand 104, the target output voltage PSD and output voltage effective value Erms, and the target output current PSD and output current effective value Irms have the relationships shown in the following equations (1), (2), (3), and (4), respectively.

ここで、

であり、出力電圧実効値Ｅrmsは、

によって表される。

here,

and the output voltage effective value Erms is

It is represented by:

ここで、

であり、出力電流実効値Ｉrmsは、

によって表される。

here,

and the output current effective value Irms is

It is represented by:

The output voltage effective value E ₁ rms and the output current effective value Irms are calculated using the root mean square value, and Δf is the unit frequency width in the PSD.

The vibration performance prediction evaluation device 10 calculates the target output voltage PSD and the target output current PSD based on the input information about the test object, the information about the vibration test pattern as the vibration test conditions, and the transfer characteristic equations (1) and (3), and calculates the output voltage effective value Erms and the output current effective value Irms based on the effective value calculation equations (2) and (4).

In addition, the acceleration effective value, velocity peak value, and displacement peak-to-peak value are calculated from the test target acceleration PSD. The acceleration effective value, velocity effective value, and displacement effective value can be calculated from the test target acceleration PSD using known formulas. The velocity peak value can be obtained by multiplying the velocity effective value by a conversion coefficient determined by a damping constant, etc. obtained in advance. In addition, the displacement peak-to-peak value can be obtained by multiplying the displacement effective value by a conversion coefficient determined by a damping constant, etc. obtained in advance.

(2) In the case of a sine vibration test When a sine vibration test is performed, the test target acceleration, target speed, and target displacement at each frequency for the vibration test are input as the test conditions.

When a test object T of mass mr is placed on the test stand 104, the target output voltage effective value Ef1rms and the target output current effective value If1rms at an arbitrary frequency f1 [Hz] have the relationships shown in the following equations (5), (6), (7), and (8), respectively.

ここで、

であり、振動試験に必要な最大出力電圧実効値Ｅrmsは、

によって表される。

here,

The maximum output voltage effective value Erms required for vibration testing is

It is represented by:

ここで、

であり、振動試験に必要な最大出力電流実効値Ｉrmsは、

によって表される。

here,

The maximum output current effective value Irms required for vibration testing is

It is represented by:

Note that E(f) and I(f) in (6) and (8) are functions of frequency f shown in transfer characteristic equations (5) and (7), and the maximum voltage Erms and maximum current Irms required for excitation are the maximum values of transfer characteristic equations (5) and (7) in the frequency range of the test conditions.

The vibration performance prediction and evaluation device 10 calculates the target output voltage and target output current corresponding to each frequency of the test conditions based on the input information about the test object, the information about the vibration test pattern or vibration conditions as the vibration test conditions, and the transfer characteristic equations (5) and (7), and calculates the maximum voltage and current effective value Erms and maximum output current effective value Irms required for the test based on the calculation equations (6) and (8) to calculate the maximum values of the voltage and current in the frequency range of the test conditions.

In addition, the acceleration peak value, velocity peak value, and peak-to-peak displacement value in the frequency range of the test conditions are calculated from the vibration test pattern or vibration conditions. The acceleration, velocity, and peak-to-peak displacement values can be calculated from the frequency of the test conditions, and can be obtained by determining the maximum acceleration, maximum velocity, and maximum peak-to-peak displacement values in the frequency range of the test conditions.

(3) In the case of shock vibration testing, when a half-sine wave is used for the shock vibration testing, the frequency f1 is calculated when the test subject T with mass mr is placed on the test stand 104 and converted into a sine wave from the action time of the test conditions. The target output voltage effective value Ef1rms and the target output effective value If1rms at that frequency f1 have the relationships shown in the following equations (9), (10), (11), and (12), respectively.

ここで、

であり、振動試験に必要な最大出力電圧実効値Ｅrmsは、

によって表される。

here,

The maximum output voltage effective value Erms required for vibration testing is

It is represented by:

ここで、

であり、試験に必要な最大出力電流実効値Ｉrmsは、

によって表される。

here,

The maximum output current effective value Irms required for the test is

It is represented by:

The vibration performance prediction evaluation device 10 calculates the target output voltage and target output current corresponding to the frequency of the sine wave calculated from the action time based on the input information about the test object, information about the maximum acceleration and action time of the test waveform of the vibration test conditions as the test conditions, and the transfer characteristic equations (9) and (11), and calculates the maximum output voltage effective value Erms and maximum output current effective value Irms required for the test based on the calculation equations (10) and (12).

The required test conditions for the velocity peak value and peak-to-peak displacement value are calculated from the maximum acceleration and action time of the test waveform. Taking advantage of the fact that the velocity peak value and peak-to-peak displacement value are functions that depend on the action time, a formula is created in advance that shows the relationship between the velocity peak value and action time, and the peak-to-peak displacement value and action time, and the formula is used to calculate the values.

The vibration capacity calculated in this manner (effective acceleration value, peak velocity value, peak-to-peak displacement value, effective output voltage value, effective output current value) is compared (S5) with the limit values (maximum acceleration, maximum velocity, maximum displacement, maximum voltage value, maximum current value) in the specifications of the vibration testing device 100 stored in the vibration capacity prediction evaluation device 10. If the vibration capacity exceeds the limit values in the specifications of the vibration testing device 100, it is determined that the desired vibration test cannot be performed, and the vibration capacity prediction evaluation device 10 is configured to notify this fact using the input/output means 12 (e.g., a display, printer, etc.) (S6).

By using the vibration performance prediction and evaluation device 10 configured in this manner, the user can quickly and reliably determine whether the desired vibration test can be performed using the selected vibration test device simply by selecting the vibration test device on which the desired vibration test is to be performed and inputting information about the test subject on which the vibration test is to be performed and information about the vibration test pattern for the desired vibration test.

In this embodiment, the vibration capacity is calculated only for the selected vibration test device, and the calculated vibration capacity is compared with the limit value in the specifications of the selected vibration test device to determine whether or not the desired vibration test can be performed. However, it is also possible to calculate the vibration capacity for all vibration test devices registered in the vibration capacity prediction evaluation device 10, and compare the calculated vibration capacity with the limit value in the specifications of each vibration test device to select a vibration test device capable of performing the desired vibration test from among the vibration test devices registered in the vibration capacity prediction evaluation device 10.

The above describes a preferred embodiment of the present invention, but the present invention is not limited to this. For example, various modifications can be made to the above example without departing from the scope of the present invention.

In addition, the present invention also includes computer-readable recording media, such as magnetic tapes (digital data storage (DDS) and the like), magnetic disks (hard disk drives (HDD), flexible disks (FD), and the like), optical disks (compact disks (CD), digital versatile disks (DVD), Blu-ray disks (BD), and the like), magneto-optical disks (MO), flash memories (solid state drives (SSD), memory cards, USB memories, and the like), on which the vibration capability prediction evaluation program described above is recorded.

REFERENCE SIGNS LIST 10 Vibration capability prediction and evaluation device 12 Input/output means 14 Calculation means 16 Storage means 100 Vibration test device 102 Movable part 104 Test stand 105 Acceleration pickup 106 Movable part support spring 108 Drive coil 114 Fixed part 116 Magnetic path member 118 Excitation coil

Claims (12)

A vibration capability predictive evaluation device that predicts and evaluates the vibration capability required in a vibration test,
a calculation means for predicting and evaluating a vibration capability based on a mass of a test object and information on vibration test conditions, the calculation means calculating an output current effective value or an output voltage effective value as the vibration capability based on a value obtained by multiplying a difference between a first transfer characteristic, which is a transfer characteristic of the mass of only a movable part on which the test object can be mounted, and a second transfer characteristic, which is a transfer characteristic when a load of a predetermined mass is mounted on the movable part, measured in advance for one or more vibration test apparatuses in all frequency ranges, by a ratio of the mass of the test object to the predetermined mass, and information on the vibration test conditions;
A vibration capability prediction and evaluation device comprising: the calculation means is configured to calculate the output voltage effective value based on a value obtained by subtracting the output voltage transmission ratio when the mass of only the movable part is the first transmission characteristic from the output voltage transmission ratio when the load of the predetermined mass is mounted on the movable part as the second transmission characteristic, and multiplying the result by a ratio of the mass of the test object to the predetermined mass, and adding the result to the output voltage transmission ratio when the mass of only the movable part is the first transmission characteristic, and information on the vibration test conditions.
The vibration capability prediction and evaluation device according to claim 1 . 3. The vibration excitation capability prediction and evaluation device according to claim 1, wherein the calculation means is configured to calculate the output current effective value based on a value obtained by subtracting the output current transfer ratio when the mass of only the movable part is the first transfer characteristic from the output current transfer ratio when the load of the predetermined mass is mounted on the movable part as the second transfer characteristic, and multiplying the result by a ratio of the mass of the test object to the predetermined mass, and adding the result to the output current transfer ratio when the mass of only the movable part is the first transfer characteristic, and information on the vibration test conditions. an input means for inputting information regarding the mass of the test object and the vibration test conditions;
The vibration capability prediction and evaluation device according to any one of claims 1 to 3, further comprising: A display for displaying the predicted and evaluated excitation capacity;
The vibration capability prediction and evaluation device according to any one of claims 1 to 4, further comprising: The calculation means includes:
6. The vibration capability prediction and evaluation device according to claim 1, further comprising: a vibration testing device that is configured to determine whether or not the vibration test can be performed based on the specifications of the vibration testing device and the calculated vibration capability. The vibration performance prediction and evaluation device according to claim 6, further comprising a storage means for storing the specifications of the vibration test device. The vibration performance prediction and evaluation device according to any one of claims 1 to 7, characterized in that it is provided with a storage means for storing the first transfer characteristic and the second transfer characteristic of the vibration test device. A vibration capability predictive evaluation method for predicting and evaluating a vibration capability required in a vibration test, comprising the steps of:
a step of predicting and evaluating a vibration capability based on a mass of a test object and information on vibration test conditions, the step comprising: calculating an output current effective value or an output voltage effective value as the vibration capability based on a value obtained by multiplying a difference between a first transfer characteristic, which is a transfer characteristic of the mass of only a movable part on which the test object can be mounted, and a second transfer characteristic, which is a transfer characteristic when a load of a predetermined mass is mounted on the movable part, measured in advance for each of one or more vibration test apparatuses in all frequency ranges, by a ratio of the mass of the test object to the predetermined mass, and on information on the vibration test conditions;
A vibration capability prediction and evaluation method including: The vibration capacity prediction and evaluation method according to claim 9, characterized in that it is determined whether or not the vibration test can be performed based on the specifications of the vibration test device and the calculated vibration capacity. A program for causing a computer to execute the vibration capability prediction and evaluation method according to claim 9 or 10. A computer-readable recording medium having the program according to claim 11 recorded thereon.

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