JPH04264226A - Shaking tester - Google Patents

Abstract

PURPOSE:To apply accurate vibration to a supply product by setting a actively controllabel cylinder between a frame base and a floor surface parallel with an air spring to suppress vibration of a shaker itself at the time of low frequency shaking. CONSTITUTION:At the time of high frequency vibration, vibration is generated in a shaker body 2 by reaction of shaking and transmitted to a floor surface 6 through a frame base 4. To prevent this, air springs 5a and 5b are arranged between the frame base 4 and the floor surface 6 to suppress vibration and a sample 1 is shaken through a shaking table 3. At the time of low frequency shaking, to suppress vibration of the apparatus itself under the influence of the air springs 5a and 5b with low rigidity, the pressure of air to be sent to a cylinder 7 is controlled actively. In other words, the vibration generated during a shaking test is detected with a sensor 9 mounted on the frame base 4 and controls a flow rate adjuster 10 to adjust a flow rate of the air which flows into the cylinder 7 from a pressure generator 8.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrodynamic vibration testing device capable of applying vibration to a test device.

0002

[Prior Art] Fig. 2 is a front view showing a conventional example of a vibration exciter with a frame equipped with an air spring. The product 1 is fixed on the vibration table 3 of the vibration exciter main body 2. The vibration exciter main body 2 is held by a pedestal 4, and this pedestal 4 is supported by air springs 5a, 5.
It is installed on the floor surface 6 via b.

Next, the operation will be explained. In general, a vibration test using an electrodynamic vibrator is performed by applying an excitation force generated in the vibrator body 2 according to Fleming's left-hand rule to the specimen 1 via the vibration table 3. During vibration, vibration is generated in the vibration exciter main body 2 due to the reaction force. When the test device is a single unit (without air springs 5a and 5b), the vibration due to the reaction force is transmitted to the floor 6 via the pedestal 4, and the vibration transmitted to the floor is transmitted to precision equipment, etc. Air springs 5a with low rigidity are not used between the pedestal 4 and the floor 6 to avoid adverse effects or discomfort to people.
, 5b, the vibration transmission during high vibration in the high frequency range is reduced.

0004

[Problems to be Solved by the Invention] As mentioned above, in the conventional vibration exciter, the device itself is supported by an air spring with low rigidity, so when excitation is performed at low frequency, the device itself is affected by the influence of the air spring. Since low frequency vibrations are generated, there is a problem in that it is impossible to apply accurate vibrations to the sample.

[0005] This invention was made in order to solve the above-mentioned problems, and its purpose is to obtain a vibrator that can give accurate vibrations to a specimen during low-frequency vibration. .

[0006]

[Means for Solving the Problems] The vibration test device according to the present invention has a cylinder that can be controlled by active control installed between the pedestal and the floor in parallel with an air spring, This is designed to suppress the vibration of the vibration device itself.

[0007]

[Function] The vibration testing device according to the present invention suppresses the generation of vibration in the vibration device itself through active vibration damping, so that it is possible to accurately apply a predetermined vibration to the sample.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, numerals 1 to 6 are similar to the conventional device described above. 7 is a cylinder placed in the center between the pedestal 4 and the floor 6, 8 is a pressure generator for creating pressure to give vertical force to this cylinder, and the flow rate of air pressure sent to the cylinder 7 is The flow rate is adjusted by a flow rate regulator 10 according to the vibration of the pedestal 4 detected by a displacement sensor 9 attached to the pedestal 4. Note that 11 is a controller for performing active control.

Next, its operation will be explained. The cylinder 7 can freely apply vertical vibration to the vibration device itself by controlling the flow regulator 10 using the pressure air generated by the pressure generator 8 as a driving source. Here, the displacement sensor 9 attached to the pedestal 4 measures the vibrations generated during the vibration test.
is detected and sent to the controller 11. The controller 11 processes this vibration waveform, controls the flow regulator 10 so that the vibration of the pedestal 4 is reduced, and can control the vertical force of the cylinder 7. Therefore, by performing control based on active control from vibration detection by the displacement sensor 9 which is the input to the force generated by the cylinder 7 which is the output, it is possible to suppress the vibration of the vibration device itself. .

0010

[Effects of the Invention] As described above, according to the present invention, since the vibration of the exciter itself is suppressed by using a cylinder under active control, the resonance phenomenon does not occur during low frequency excitation, and the accuracy is high. This has the effect of making it possible to conduct a vibration test.

[Brief explanation of the drawing]

FIG. 1 is a front view showing a vibration testing apparatus according to an embodiment of the present invention.

FIG. 2 is a front view of a conventional vibration testing device.

[Explanation of symbols]

1 Sample product 2 Vibrator body ４　　　　　　　　　　　　 5a, 5b Air spring 7 Cylinder 8 Pressure generator 9 Displacement sensor 10 Flow rate regulator 11 Controller

Claims (1)

[Claims] Claim 1: A vibration testing device in which a specimen is mounted on a vibration exciter held on a pedestal and subjected to vibration, in which an air spring is installed between the pedestal and the floor under active control. A vibration testing device characterized by being equipped with a controllable pneumatic cylinder.