Method and apparatus for keeping low pressure and vibration composite testing vibration table surface center

Abstract

A method for keeping center of a vibration table for low air-pressure and vibration combined test and a device thereof relate to the field of mechanics environment test equipment. In the device, the inner space of an electric vibration table is designed to a sealed rigid air chamber, and the table is positioned at a vibration center of a vertical vibration test or horizontal vibration test and is supported by floating balance between the air pressure of a low air-pressure test box arranged on one end of the table and the air pressure of a rigid air chamber arranged on the other end of the table. A measuring device is used for detecting the distance and direction of the table static and dynamic deflection from the theoretical vibration center position, and an aeration passage and two exhausting passages aerate and exhaust the rigid air chamber to keep the table at the vibration center position during the test. The method and the device are applicable to the vertical vibration combined test and the horizontal vibration combined test, the vibration table can be automatically always kept at the vibration center position during the combined test, in particular when the test low air pressure is in aeration state, the vibration table can also be always kept at the vibration center position.

Description

technical field [0001] The invention relates to a composite environment vibration test equipment in the mechanical environment test equipment, in particular to a method for maintaining the center position of a vibrating table in a low air pressure and vibration composite test equipment and a device for realizing the method. The method and device can automatically keep the vibrating table always at the center of the displacement during the compound test, especially when the test low pressure is in a changing state, it can also keep the vibrating table always at the center of the displacement. Background technique [0002] An electrodynamic shaker is a test device that simulates a vibrational environment. The low-pressure test chamber is a test equipment that simulates a low-pressure environment. In the past, due to the limitation of test equipment, the vibration simulation test and low air pressure simulation test of test products (such as electronic components, instruments ...

AI Technical Summary

Problems solved by technology

In the low air pressure and vibration composite test, since the air pressure in the low air pressure test chamber changes within the range of ≤ 1 atmospheric pressure, the test product, table 2 and moving coil 3 will move upward under the action of external air pressure, making the vibration working table 2 The vertical direction deviates from the vibration center position upwards, resulting in the failure of the composite test to proceed normally

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