Elastic supporting device

Abstract

The invention relates to the technical field of noise tests, in particular to an elastic supporting device. The elastic supporting device comprises an air compressor, wherein the air outlet of the aircompressor is fixedly connected with a left air pipe, the right end of the left air pipe is fixedly connected with a pressure reducing valve, and the portion, located on the right side of the air compressor, of the bottom of the pressure reducing valve is fixedly connected with a fixing frame; the right side of the pressure reducing valve is fixedly connected with the right air pipe; and the right side of the fixing frame is provided with a rigid supporting base, wherein the top of the rigid supporting base is fixedly connected with a lower switching frame. According to the elastic supportingdevice, the rigid supporting frame, the air compressor, air springs, the left air pipe and the right air pipe are arranged, so that the problem that in a current noise test, a tested product needs tobe elastically supported so that free-free boundary conditions of the tested product in a flying state can be simulated, namely, the supporting frequency of the tested product is smaller than 1 / 4 ofthe starting frequency of the test, but through a traditional rubber pad supporting mode, it is difficult for the supporting frequency to drop to 10 Hz or below, which leads to inaccuracy in experimental data can be solved.

Description

technical field [0001] The invention relates to the technical field of noise testing, in particular to an elastic support device. Background technique [0002] The aircraft will experience severe engine jet noise and aerodynamic noise during launch and flight, which will cause vibration of the aircraft structure and equipment, and may cause damage. The noise test simulates the noise environment in the flight state by imposing noise loads on the aircraft, and can obtain the vibration response of structures, instruments and equipment and their connections, and assess their adaptability to the noise environment. According to different types of acoustic excitation, noise tests can usually be divided into reverberation chamber noise tests that generate diffuse sound fields and traveling wave tube noise tests that generate grazing incidence sound fields. The former is suitable for vehicles, power equipment and other high-intensity sound sources, etc. Equipment or structures opera...

AI Technical Summary

Problems solved by technology

[0003] At present, in the noise test, it is necessary to elastically support the tested product to simulate its free-free boundary condition in the flight state, that is, the support frequency of the test product is less than 1 / 4 of the initial frequency of the test, and the traditional rubber pad support way, it is difficult to lower the support frequency below 10Hz, resulting in inaccurate experimental data, so an elastic support device is needed to improve this problem

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