JP7430433B2 - Excitation ability prediction evaluation device, excitation ability prediction evaluation method, and excitation ability prediction evaluation program in vibration testing - Google Patents

Description

The present invention quickly and reliably selects an appropriate vibration test device and quickly and reliably determines whether or not it is possible to conduct a vibration test when performing vibration tests such as vibration characteristic tests and durability tests on industrial products. The present invention relates to a vibration ability prediction and evaluation device, a vibration ability prediction and evaluation method, and a vibration ability prediction and evaluation program.

2. Description of the Related Art Conventionally, vibration tests have been performed using a vibration test apparatus in order to perform vibration characteristic tests and durability tests on industrial products such as aerospace equipment, automobile equipment, electronic products, and precision equipment.

A vibration test apparatus 100 for performing a vibration test includes, for example, as shown in FIG. 3, a movable part 102 on which a test object T is mounted, and a fixed part 114 having a magnetic path member 116. .
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 magnetic flux flowing through the magnetic path member 116. The excitation coil 118 is applied with a DC voltage from a constant voltage source (not shown), thereby causing a constant magnetic flux to flow through the magnetic path member 116 .

On the other hand, the movable part 102 includes a test stand 104 on which the test object T is mounted, a movable part support spring 106 that connects the movable part 102 and the fixed part 114 to hold the movable part 102 in a movable state, and a magnetic path. The driving coil 108 is inserted into the gap of the 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 by passing an alternating current through the drive coil 108, the movable part 102 can be vibrated. Note that by changing the magnitude of the alternating current flowing through the drive coil 108, the magnitude of the generated vibration (excitation force) can be controlled.

When performing a random vibration test on the test object T using such a vibration test apparatus 100, the alternating current applied to the drive coil 108 has a PSD (power spectral density) according to the vibration test pattern applied to the test object T. It is applied to the drive coil 108 as an electrical signal based on the profile. Also, when performing a sine vibration test or a shock vibration test, an alternating current is applied to the drive coil 108 as an electric signal based on information regarding the vibration test pattern.

Note that the acceleration, velocity, excitation force, displacement, etc. generated by the vibration testing apparatus 100 are configured to be acquired using an acceleration pickup 105 provided on the test stand 104.

In the case of a random vibration test, the PSD profile of the test condition is a spectral density function that indicates acceleration per unit frequency width, but if the distribution is uneven, the excitation force generated by the vibration test device 100 may be I can't figure it out. For this reason, it was not possible to immediately know what specs of vibration testing equipment should be used to conduct vibration testing, or whether vibration testing could be performed with the vibration testing equipment that they owned.

Also, in the case of sine vibration tests and shock vibration tests, the current and voltage that need to be applied to the vibration test equipment differ depending on the frequency band required for the vibration test, just like the random vibration test. Because it is difficult to ascertain the correct current and voltage, it was not possible to immediately determine whether the vibration test equipment that they owned could perform vibration tests.

For this reason, conventionally, for example, by setting the capacity of the test condition to 50% and operating each vibration testing apparatus 100, the values of the applied voltage and applied current input to the drive coil 108 of the vibration testing apparatus 100 are determined. By calculating excitation specifications such as maximum excitation force, maximum acceleration, and maximum displacement, and comparing the calculated excitation specifications with the specifications of the actual vibration test equipment, you can select a vibration test equipment, We are determining whether the desired vibration test can be performed with the vibration test equipment we own.

In view of the current situation, the present invention predicts the excitation specifications necessary for a vibration test based on information about the test object and information about the vibration test pattern, and quickly and reliably adjusts the vibration test equipment. An excitation ability prediction and evaluation device, an excitation ability prediction and evaluation method, and an excitation ability prediction that allow you to make selections and quickly and reliably judge whether or not it is possible to conduct vibration tests with your own vibration test equipment. The purpose is to provide an evaluation program.

The present invention was invented in order to solve the problems in the prior art as described above, and the excitation ability prediction and evaluation device of the present invention is capable of evaluating the excitation ability required in a vibration test using a vibration testing device. This is a vibration excitation ability predictive evaluation device that performs predictive evaluation, and performs vibration excitation for all pre-registered vibration test devices based on the mass of the test object and information regarding vibration test conditions for each vibration test device. A means for predicting and evaluating performance, the first transfer characteristic being the transfer characteristic of the first mass and the transfer characteristic of the second mass, which are measured in advance for each of one or more vibration test devices in all frequency ranges. The vibration excitation ability is determined based on the difference between the second transfer characteristic, which is the transfer characteristic, multiplied by the ratio of the mass of the test object to the second mass, and information regarding the vibration test conditions. Calculate the output current effective value or output voltage effective value as follows, and perform the vibration test for each of all the vibration test devices based on the specifications of the vibration test device and the calculated excitation capacity. and calculation means for determining whether or not it is possible.

The vibration ability prediction evaluation method of the present invention is a vibration ability prediction evaluation method that predicts and evaluates the vibration ability required in a vibration test using a vibration test device, and is a method for predicting and evaluating vibration ability for all vibration test devices registered in advance. , a means for predicting and evaluating the excitation ability of each vibration test device based on the mass of the test object and information regarding the vibration test conditions, and for each vibration test device in advance in all frequency ranges. The difference between the first transfer characteristic, which is the transfer characteristic of the first mass, and the second transfer characteristic, which is the transfer characteristic of the second mass, measured in a calculation step of calculating an output current effective value or an output voltage effective value as the excitation capacity based on the value multiplied by the mass ratio of and a determination step of determining whether or not the vibration test can be performed based on the specifications of the vibration test device and the calculated vibration excitation capacity.

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

Further, a computer-readable recording medium on which such a program is recorded is also included as an aspect of the present invention.

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

FIG. 1 is a schematic diagram for explaining the configuration for predictively evaluating the excitation ability of a vibration testing device using the excitation ability prediction and evaluation device of the present invention. FIG. 2 is a flowchart for explaining the flow of obtaining a determination result as to whether or not a vibration test can be performed using the vibration ability 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 based on the drawings.
FIG. 1 is a schematic diagram for explaining the configuration for predictively evaluating the excitation ability of a vibration testing device using the excitation ability prediction and evaluation device of the present invention.

Since the vibration testing apparatus 100 used in this embodiment has a similar configuration to the conventional vibration testing apparatus 100 described above, the same constituent members are given the same reference numerals and detailed explanation thereof will be omitted. In this embodiment, an electrodynamic type vibration tester is used as an example of the vibration tester 100, but an induction type vibration tester can be used in the same manner.

Further, in this embodiment, a random vibration test using the vibration testing apparatus 100 is explained as an example, but other vibration tests such as a sine vibration test and a shock vibration test can be similarly performed. can.

The vibration ability prediction and evaluation device 10 of this embodiment is constituted by a computer system having input/output means 12, calculation means 14, and storage means 16. Note that the computer system may be a standalone computer, or may be a client server system, a web system, or the like.

The storage means 16 of the vibration ability prediction and evaluation device 10 stores a vibration ability prediction evaluation program for predictively evaluating the vibration ability of the vibration testing device 100, as will be described later. The excitation ability of the vibration test apparatus 100 is configured to be calculated based on vibration test conditions including information regarding the vibration test pattern and information regarding the vibration test pattern.

Furthermore, in the vibration ability prediction and evaluation device 10 of the present embodiment, specifications of the vibration testing device 100, data regarding the transfer characteristics of the vibration testing device 100 acquired in advance, and the like are stored in the storage unit 16. However, it is also possible to configure the vibration testing apparatus 100 so that the specifications and data regarding the transfer characteristics are inputted by the user using the input/output means 12 (for example, a keyboard, a mouse, etc.).

Specifications of the vibration testing apparatus 100 include, for example, the maximum excitation force in the vertical and horizontal directions, the frequency range, the maximum acceleration, the maximum speed, the maximum displacement, the maximum loading mass, the weight and size of the test stand 104, etc. I can do it. On the other hand, data regarding the transfer characteristics of the vibration testing apparatus 100 can be acquired as follows.

First, a vibration test is performed under predetermined vibration conditions without placing anything on the test stand 104 of the vibration test apparatus 100, that is, with no load (mass m0). Obtain the excitation force and acceleration generated in the vibration test, and obtain the transfer characteristics during the vibration test.

Next, a vibration test is performed under the same vibration conditions with a load of an arbitrary mass m1 placed on the test stand 104 of the vibration test apparatus 100, and the transfer characteristics at this time are obtained. Here, the transfer characteristics include, for example, the output voltage transfer rate (output voltage PSD/test target acceleration PSD), which is the ratio between the actually measured output voltage PSD and the test target acceleration PSD, and the actually measured output current PSD and the test target acceleration PSD. The output current transfer rate (output current PSD/test target acceleration PSD) which is the ratio of

In this way, by performing a vibration test under the same excitation conditions in the state of mass m0 and mass m1, a change occurs in the transfer characteristics in accordance with the difference in mass. Therefore, the transfer characteristics are: output voltage transfer ratio VTm0 when no load is applied, output voltage transfer ratio VTm1 when a load of arbitrary mass m1 is mounted, output current transfer coefficient CTm0 when no load is mounted, and output voltage transfer ratio when a load of arbitrary mass m1 is mounted. The output current transfer rate CTm1 is acquired for each vibration test device 100, and is stored in the vibration ability prediction evaluation device 10 in association with the vibration test device 100 and the transfer characteristics.

Further, as the transfer characteristic, it is preferable to obtain a damping constant or the like unique to the vibration testing apparatus 100 in advance. For example, the damping constant can be calculated from the displacement at the time when the signal input is stopped after inputting a sine vibration signal to the vibration testing apparatus 100, and the displacement after a predetermined time has elapsed after the signal input is stopped. . However, if there is no 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 such that all of the vibration testing apparatuses that are to obtain the transfer characteristics can vibrate under the same conditions.

Using the vibration ability prediction and evaluation device 10 configured as described above, the user can determine whether or not it is possible to perform a vibration test on any test object T under any vibration conditions in the following manner. Able to make judgments.

FIG. 2 is a flowchart for explaining the flow of obtaining a determination result as to whether or not a vibration test can be performed using the vibration ability prediction and evaluation device 10 of this embodiment.

First, the user selects the vibration testing apparatus 100 that performs predictive evaluation of vibration ability (S1). In this embodiment, the specifications of each vibration testing device 100 are stored in advance in the excitation ability prediction and evaluation device 10, and the specifications of each vibration testing device 100 are stored using the input/output means from among the specifications displayed on the display means of the excitation ability prediction and evaluation device 10. Although the configuration is such that the specifications of the vibration testing device 100 that performs the predictive evaluation of the vibration ability can be input to the vibration ability prediction and evaluation device 10 using an input/output means.

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

The test conditions input in S3 and the calculation of the excitation capacity performed in S4 differ depending on the random vibration test, sine vibration test, and shock vibration test. Specifically, the test conditions are input as follows. , the calculation of the excitation capacity is performed.

(1) In case of random vibration test When performing a random vibration test, a test target acceleration PSD profile is input as a test condition.

The target output voltage PSD, output voltage effective value Erms, target output current PSD, and output current effective value Irms in a state where the test object T with mass m is placed on the test stand 104 are calculated by the following formulas (1) and (2), respectively. ), (3), and (4).

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,

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

Represented by

Note that the output voltage effective value E ₁ rms and the output current effective value Irms are determined by the root mean square value. Further, Δf is a unit frequency width in PSD.

The vibration ability prediction evaluation device 10 calculates the target output voltage PSD and While calculating the target output current PSD, the output voltage effective value Erms and the output current effective value Irms are calculated based on the effective value calculation formulas (2) and (4).

Furthermore, an effective acceleration value, a velocity peak value, and a displacement peak-to-peak value are calculated from the test target acceleration PSD. The effective acceleration value, effective velocity value, and effective displacement value can be calculated from the test target acceleration PSD using known calculation formulas. The speed peak value can be obtained by multiplying the effective speed value by a conversion coefficient determined by a damping constant or the like obtained in advance. Further, the displacement peak-to-peak value can be obtained by multiplying the displacement effective value by a conversion coefficient determined by a damping constant or the like obtained in advance.

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

With the test object T having mass mr placed on the test stand 104, the target output voltage effective value Ef1rms and target output current effective value If1rms at an arbitrary frequency f1 [Hz] are calculated by the following formula (5), ( 6), (7), and (8).

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 the vibration test 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 the vibration test is

Represented by

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

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

Further, from the vibration test pattern or vibration conditions, the acceleration peak value, velocity peak value, and displacement peak-to-peak value in the frequency range of the test conditions are calculated. Acceleration, velocity, and displacement peak-to-peak values can be calculated from the frequency of the test conditions, and the maximum values of acceleration, velocity, and displacement peak-to-peak values can be calculated within the frequency range of the test conditions. It can be obtained by

(3) In the case of a shock vibration test When using a half-sine wave as a shock vibration test, the operating time of the test condition with the test object T with mass mr placed on the test stand 104 is converted into a sine wave. The target output voltage effective value Ef1rms and the target output effective value If1rms at that frequency f1 have the relationships as shown in the following equations (9), (10), (11), and (12), respectively. have

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 the vibration test 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

Represented by

The excitation ability prediction evaluation device 10 inputs information regarding the test object, information regarding the maximum acceleration and duration of the test waveform of the test conditions as the vibration test conditions, and transfer characteristic equations (9) and (11). Based on the equations (10) and (12), calculate the target output voltage and target output current corresponding to the frequency of the sine wave calculated from the action time, and calculate the maximum output voltage effective value Erms required for the test based on formulas (10) and (12). and calculate the maximum output current effective value Irms.

In addition, the velocity peak value and displacement peak-to-peak value necessary for the test conditions are calculated from the maximum acceleration and action time of the test waveform. Utilizing the fact that the velocity peak value and the displacement peak-to-peak value are functions that depend on the action time, calculation formulas showing the relationship between the velocity peak value and the action time, and the displacement peak-to-peak value and the action time are calculated in advance. It can be calculated using the calculation formula.

The vibration testing device stores the vibration ability (acceleration effective value, velocity peak value, displacement peak-to-peak value, output voltage effective value, output current effective value) thus calculated in the vibration ability prediction and evaluation device 10. By comparing with the limit values (maximum acceleration, maximum speed, maximum displacement, maximum voltage value, maximum current value) in the specifications of the vibration testing device 100 (S5), it was found that the excitation ability exceeded the limit values in the specifications of the vibration testing device 100. In this case, it is determined that the desired vibration test cannot be performed, and the vibration ability prediction and evaluation device 10 notifies the user of this using the input/output means 12 (for example, a display or a printer) (S6). It is composed of

By using the vibration ability prediction and evaluation device 10 configured as described above, the user can select the vibration test device to perform the desired vibration test, as well as obtain information regarding the test object to be subjected to the vibration test and the desired vibration. By simply inputting information regarding the vibration test pattern for the test, it is possible to quickly and reliably determine whether or not the desired vibration test can be performed by the selected vibration test device.

In addition, in this embodiment, by calculating the excitation capacity only for the selected vibration test apparatus and comparing the calculated excitation capacity with the limit value in the specifications of the selected vibration test apparatus, the desired vibration test apparatus can be obtained. It is determined whether or not it is possible to perform a vibration test, but for example, the vibration ability is calculated for all the vibration test devices registered in the vibration ability prediction and evaluation device 10, and the calculated vibration ability and By comparing the limit values in the specifications of each vibration test device, a vibration test device capable of performing the desired vibration test is selected from among the vibration test devices registered in the vibration ability prediction evaluation device 10. It can also be configured as follows.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited thereto. For example, various changes can be made to the above embodiments without departing from the purpose of the present invention.

In addition, for example, magnetic tape (digital data storage (DDS), etc.), magnetic disk (hard disk drive (HDD), flexible disk (FD), etc.), optical disk (compact disk ( Computer-readable recording media such as CDs), digital versatile discs (DVDs), Blu-ray discs (BDs), etc.), magneto-optical discs (MOs), and flash memory (SSDs (Solid State Drives), memory cards, USB memories, etc.) are also books. Included as an aspect of the invention.

10 Excitation ability prediction 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 (15)

A vibration ability prediction and evaluation device that predicts and evaluates vibration ability required in a vibration test using a vibration test device,
It is a means for predicting and evaluating the excitation ability of all pre-registered vibration test devices based on the mass of the test object and information regarding the vibration test conditions for each vibration test device, and The difference between the first transfer characteristic, which is the transfer characteristic of the first mass, and the second transfer characteristic, which is the transfer characteristic of the second mass, measured in advance by one or more vibration test devices in the range. is multiplied by the ratio of the mass of the test object to the second mass, and information regarding the vibration test conditions, calculate the effective output current value or the effective output voltage value as the excitation capacity. , a calculation means for determining whether or not the vibration test can be performed for each of all the vibration test devices based on the specifications of the vibration test device and the calculated vibration excitation capacity;
A vibration ability prediction evaluation device comprising: The calculation means compares the calculated excitation capacity with a limit value in the specifications of the vibration test apparatus for each of all the vibration test apparatuses, and determines that the calculated excitation capacity is less than or equal to the limit value. In a certain case, the vibration testing device determines that it is possible to perform the vibration test, and if the calculated vibration excitation capacity exceeds the limit value, the vibration testing device performs the vibration test. is judged to be impossible,
The vibration ability prediction evaluation device according to claim 1. output means for notifying the result of the determination when the vibration testing device is determined by the calculation means to be unable to perform the vibration test;
The vibration ability prediction evaluation device according to claim 2, further comprising: The calculation means calculates, in all the frequency ranges, the output voltage transfer rate of the first mass as the first transfer characteristic from the output voltage transfer rate when the second mass is loaded as the second transfer characteristic. Add a value obtained by subtracting the output voltage transfer rate when a load is mounted, multiplied by the ratio of the mass of the test object to the second mass, to the output voltage transfer rate when the first mass is loaded. configured to calculate the effective value of the output voltage based on the obtained value and information regarding the vibration test conditions;
The vibration ability prediction and evaluation device according to any one of claims 1 to 3. The output voltage transfer rate when the first mass is loaded is the output voltage transfer rate when there is no load,
The vibration ability prediction evaluation device according to claim 4. The calculation means calculates the output current transfer rate of the first mass as the first transfer characteristic from the output current transfer rate when the second mass is loaded as the second transfer characteristic in all the frequency ranges. Add a value obtained by subtracting the output current transfer rate when the load is mounted, multiplied by the ratio of the mass of the test object to the second mass, to the output current transfer rate when the first mass is loaded. The excitation ability prediction and evaluation device according to any one of claims 1 to 5, wherein the device is configured to calculate the effective value of the output current based on the obtained value and information regarding the vibration test conditions. The output current transfer rate when the first mass is loaded is the output current transfer rate when there is no load,
The vibration ability prediction evaluation device according to claim 6. input means for inputting the mass of the test object and information regarding the vibration test conditions;
The vibration ability prediction and evaluation device according to any one of claims 1 to 7, further comprising: The vibration ability prediction and evaluation device according to any one of claims 1 to 8, further comprising storage means for storing specifications of the vibration test device. 10. The vibration ability prediction and evaluation device according to claim 9, wherein the storage means stores the first transfer characteristic and the second transfer characteristic of the vibration testing device. A method for predicting and evaluating the excitation ability required in a vibration test using a vibration test device, the method comprising:
A process of predicting and evaluating the excitation ability of all pre-registered vibration test devices based on the mass of the test object and information regarding the vibration test conditions for each vibration test device. The difference between the first transfer characteristic, which is the transfer characteristic of the first mass, and the second transfer characteristic, which is the transfer characteristic of the second mass, measured in advance by one or more vibration test devices in the range. is multiplied by the ratio of the mass of the test object to the second mass, and information regarding the vibration test conditions, calculate an effective value of output current or effective value of output voltage as the excitation capacity. calculation process,
A determination step of determining whether or not the vibration test can be performed for each of all the vibration test devices based on the specifications of the vibration test device and the calculated vibration excitation capacity;
A method for predicting and evaluating vibration ability, including The judgment step is to compare the calculated excitation capacity with a limit value in the specifications of the vibration test apparatus for each of all the vibration test apparatuses, and to determine whether the calculated excitation capacity is equal to or less than the limit value. In a certain case, the vibration testing device determines that it is possible to perform the vibration test, and if the calculated vibration excitation capacity exceeds the limit value, the vibration testing device performs the vibration test. is judged to be impossible,
The method for predicting and evaluating vibration ability according to claim 11. an output step of notifying the result of the determination when the vibration test device is determined to be unable to perform the vibration test in the calculation step;
The method for predicting and evaluating vibration ability according to claim 12, further comprising: A program for causing a computer to execute the method for predicting and evaluating vibration ability according to any one of claims 11 to 13. A computer readable recording medium recording the program according to claim 14.

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