Vibration testing system under low air pressure environment

Abstract

The invention relates to the field of vibration testing equipment, and specifically relates to and discloses a vibration testing system under a low air pressure environment. The vibration testing system comprises a vibrating table and a test chamber. The vibrating table comprises a vibrating table casing, and a moving coil arranged on the vibrating table casing. The test chamber is fixedly arranged over the moving coil. An enclosed cavity is arranged inside the test chamber. The enclosed cavity of the test chamber is connected to a vacuum pump. The lower part of the vibrating table casing is also provided with an enclosed cavity. The enclosed cavity in the vibrating table casing is also connected to a vacuum pump. By use of the vibration testing system, the pressure inside the vibrating table is equal to the pressure inside the test chamber. That is, the upper side and the lower side of the moving coil are subjected to the same air pressure, so that stress at the upper side of the moving coil and stress at the lower side of the moving coil are balanced and the moving coil is always kept at an equilibrium position. By use of the vibration testing system, reliable operation of the vibrating table and the test chamber under a low air pressure environment is achieved; the temperature, humidity and vibration environment simulation will not be influenced. A four-index integrated vibration testing system is provided.

Description

technical field [0001] The invention relates to a vibration test device, in particular to a vibration test system working reliably in a low-pressure environment. Background technique [0002] At present, the test technology of electric vibration table and three comprehensive test chambers (simulating temperature, humidity, vibration environment) has been very mature, but the test of simulated specimens in low pressure environment can only be carried out in a closed vacuum tank. Simulation under temperature and humidity conditions cannot be carried out. [0003] It can be said that although the above-mentioned vacuum tank can meet the requirements of the low-pressure test, it simulates a single environment after all, which is inconsistent with the composite environment in which the test piece itself is located, that is, the test state is not real. Therefore, it is necessary to develop a four-integrated environmental test system, that is, a system that integrates the four det...

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Problems solved by technology

However, in this patent document, the air pressure in the cavity of the table body and the air pressure in the table test chamber cannot be kept consistent in real time, and it is necessary to inflate and pump air continuously to ensure the center position of the movi

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