Multi-input multi-output continuous sine frequency sweep vibration test method and test system

Abstract

The present invention provides a multiple-input-multiple-output continuous sine scanning frequency vibration test method and system. The method comprises the following steps of: identifying an inversemultistep prediction model of a multiple-input-multiple-output continuous sine scanning frequency vibration test system, and setting parameters of the multiple-input-multiple-output continuous sine scanning frequency vibration test; performing low-degree trial test; and recovering a normal degree to complete the multiple-input-multiple-output continuous sine scanning frequency vibration test. Themultiple-input-multiple-output continuous sine scanning frequency vibration test method and system achieve the generation of continuous sine scanning frequency excitation signals to achieve continuous transformation of the scanning frequency signal frequency and perform control of the amplitude and the phase of response signals. Through the test method and the test system, a more accurate test result is obtained so as to provide more efficient reference data for development and production of tested products.

Description

technical field [0001] The invention relates to the technical field of vibration testing, in particular to a multi-input multi-output continuous sinusoidal sweep vibration testing method and testing system. Background technique [0002] Vibration environment test is an important basis for testing product reliability. Rotating mechanisms are widely used in products such as aerospace, automobiles, ships, and household appliances. When these rotating mechanisms start and stop, they will inevitably excite the whole structure with sweeping vibration. Therefore, the sine frequency sweep test, as an important means to confirm product reliability, has a position that cannot be ignored in the product development process. Existing multi-input multi-output sinusoidal frequency sweep test systems are generally based on frequency domain algorithms and generate excitation signals through frequency response functions. However, the frequency response function is based on the assumption of...

AI Technical Summary

Problems solved by technology

However, the frequency response function is based on the assumption of steady-state response, and the excitation frequency changes in real time during the sine frequency sweep process, which does not satisfy this assumption

Due to some limitations in the implementation of the frequency domain method, the multi-input multi-output sine frequency sweep test is often carried out in a step-by-step manner, but the step-by-step sweep destroys the continuity of the sweep process

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