JP2001174362A - Vibration tester - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vibration tester capable of enlarging the maximum loading size of a sample while maintaining the vibration frequency to be tested in a high range. SOLUTION: Plural vibration units 2 formed by fitting a vibration base 2b to an oscillator 2a are arranged so that the vibration bases 2b can be moved in opposite directions. A sample is loaded so as to be stretched between the vibration bases 2b. With this structure, since dimension of the vibration base can be reduced in comparison with a conventional one, vibration frequency to be tested is maintained in a high range, while the maximum loading size of the sample can be enlarged.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration tester for performing a vibration test on a comparatively large specimen at a higher vibration and lower running cost than before.

[0002]

2. Description of the Related Art Generally, in order to improve the reliability of industrial products, various vibration tests are performed on prototypes and products under very severe conditions. Of these, a relatively large test sample was conventionally performed using, for example, a vibration tester 100 shown in FIG.

A vibration tester 100 includes a vibration table 101 having a substantially square shape on which a sample is placed, four vibration vibrators 102 connected to both ends of two opposing sides of the vibration table 101, And a vibration control device 103 for controlling the machine 102. Shaking table 101 and four shakers 1
Numeral 02 is installed on a foundation 110, and the vibration control device 103 is installed in a vibration control room at a position away from the foundation 110. In other words, the vibration control device 103 controls the vibrations of the vibrators 102 and 102 facing each other to have phases opposite to each other, thereby causing the vibration table 101 to vibrate in the horizontal direction together with the sample. For this reason, the vibration tester 100 can perform a vibration test on a larger object as compared with a vibration tester having only one vibrator.

[0004]

In the vibration tester 100 having the above-described structure, the vibration table 101 needs to be at least as large as the sample, so that it is inevitably large. When the shaking table 101 becomes large, the shaker 10
2 is a vibration table 1 even when high frequency vibration is applied to the vibration table 101.
01, vibration is not transmitted to the sample. For this reason, it is difficult for the conventional vibration tester to increase the maximum mounting size of the test sample while maintaining the testable vibration frequency in a high state. For example, a vibration table of 1 square meter (almost the test sample) Is equal to 10)
The limit was about 00 hertz.

In view of the above circumstances, an object of the present invention is to provide a vibration testing machine capable of increasing the maximum mounting size of a test sample while maintaining a high testable vibration frequency. .

[0006]

In order to solve the above-mentioned problems, the present invention provides a vibrator (2)
The vibration tester (1) for vibrating the vibration table (2b) according to a) and performing a vibration test of the specimen on the vibration table includes:
A plurality of vibration units each having a vibration table attached to a vibrator are arranged in a direction in which the vibration tables abut each other.

[0007] The vibration tester according to the present invention can perform a vibration test on an object larger than the vibration table by mounting the sample on a plurality of vibration tables. For this reason, it is possible to increase the maximum mounting amount of the specimen without increasing the size of the shaking table. Therefore, it is possible to increase the maximum mounting size of the test sample while maintaining the testable vibration frequency in a high state. Also, compared to the above-described conventional large-sized vibration test machine, vibration of higher frequency can be applied to the test sample.

Further, the total area, that is, the total weight of the shaking table is smaller than that of the above-described conventional large-sized vibration testing machine, so that the total energy consumed by the vibrator is reduced. Therefore, running costs are also reduced.

[0009] These effects are naturally obtained not only when the vibration direction of the shaker is vertical but also in the horizontal direction.

Further, when the test sample is small, the test sample is placed on only one shaking table, and only the vibration unit is moved, so that a vibration test machine for performing a vibration test of the small test sample is provided. It can also be used.

According to the present invention, the vibration unit may be movably disposed. in this case,
Move the vibration unit according to the size of the sample,
It is also possible to perform a vibration test of a larger specimen at a high vibration frequency.

In the vibration tester according to the second aspect, an air discharge port (2c) is provided at the bottom of the vibration unit to reduce the discharge pressure of the air discharged from the air discharge port. If the vibration unit is configured to float and move, the vibration unit can be easily moved. Here, the air discharged from the air discharge port may be supplied from a pump incorporated in the vibration unit, or may be supplied from outside the vibration unit.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A vibration tester 1 according to an embodiment of the present invention will be described below in detail with reference to the drawings. 1 is a schematic plan view of the vibration tester 1, FIG. 2 is a schematic side view of the same, and FIG. 3 is a schematic plan view illustrating a part of the functions of the vibration tester 1.

As shown in FIGS. 1 and 2, the vibration test machine 1 includes four vibration units 2 movably installed on a foundation 110 and a control unit for controlling a vibrator 2a of these vibration units 2. It is schematically configured by a device (not shown). Here, the configuration and functions of the control device are substantially the same as those in the related art, and thus description thereof is omitted.

The vibration unit 2 has a configuration in which a vibration table 2b is attached to a lateral output portion of a vibrator 2a for applying vibration in a horizontal direction in a state of protruding sideways. Here, the vibration unit 2
An air discharge port 2c (see FIG. 2) is provided at the bottom of the oscillating unit 2. By discharging air supplied from an air pressure supply means (not shown) at a constant pressure from the air discharge port 2c, the vibration unit 2 floats. Let me move. For this reason, the movement of the vibration unit 2 can be performed easily and quietly.

Each of the vibration units 2 is located at each vertex of one rectangle, and the vibration tables 2b are arranged so as to abut each other in a direction facing each other along the long side. These vibration units 2 apply the same vibration to the specimen 3 by causing the vibration units 2 facing each other to vibrate in opposite phases according to an instruction from the control unit.

According to the vibration testing machine 1 having such a configuration,
By mounting the sample 3 on the shaking table 2b, a vibration test of the sample 3 larger than the shaking table 2b can be performed. Therefore, by making the shaking table smaller than before, it is possible to apply a vibration having a higher frequency to the large sample 3 (for example, even the sample 3 of 1 square meter can have up to about 2000 Hz). Also, the total size of the shaking table is smaller than in the past, and less energy is required for the vibration, so that the running cost can be reduced.

As shown in the schematic plan view of FIG. 3, each of the vibration units 2 can be moved up, down, left and right on the base 110 to adjust the vertical and horizontal intervals according to the size of the sample 3. it can. For this reason, it is possible to perform a vibration test of a large sample 3 at a high frequency, which has conventionally been difficult to perform a vibration test.

Further, when the sample 3 is small, only one vibration unit 2 is activated and used, so that not only a large sample but also a small sample 3 can be handled. Also, the running cost in that case can be suppressed to the same level as that of a conventional small-sized vibration testing machine.

The present invention is not limited to the above-described embodiment, but can be arbitrarily modified without departing from the spirit of the invention.

[0021]

As described above, according to the present invention, it is possible to increase the maximum mounting size of the test sample while maintaining the testable vibration frequency in a high state. Also, compared to the above-described conventional large-sized vibration test machine, vibration of higher frequency can be applied to the test sample. Further, the total area, that is, the total weight of the shaking table is smaller than that of the conventional large-sized vibration testing machine, so that the total energy consumed by the vibrator is reduced. Therefore, running costs are also reduced.

[Brief description of the drawings]

FIG. 1 is a schematic plan view of a large-scale vibration tester according to an embodiment of the present invention.

FIG. 2 is a schematic side view of the same.

FIG. 3 is a schematic plan view illustrating one of the functions of the vibration testing machine.

FIG. 4 is a schematic perspective view illustrating an example of a conventional large vibration testing machine.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Vibration test machine 2 Vibration unit 2a Shaker 2b Shaking table 2c Air outlet

Claims (3)

[Claims] 1. A vibration tester for vibrating a shaking table by a vibrator and performing a vibration test of a specimen on the shaking table, wherein a plurality of vibration units each having a vibrating table attached to the vibrator are provided. A vibration testing machine characterized in that they are arranged in the direction in which they abut each other. 2. The vibration testing machine according to claim 1, wherein the vibration unit is movably arranged. 3. The vibration testing machine according to claim 2, wherein an air outlet is provided at a bottom portion of the vibration unit, and the vibration unit is floated and moved by utilizing a discharge pressure of air discharged from the air outlet. A vibration testing machine characterized in that: