A control method for non-stationary random vibration test

Abstract

The invention discloses a method for controlling a non-stationary random vibration test. The method comprises the steps of setting test parameters; setting non-stationary random reference signals; performing automatic system check; identifying a transfer function; performing vibration control over a uniaxial periodic cycle: within a single frame time period, respectively executing the steps of calculating a normalization control power spectrum; performing correction calculation to obtain a normalization driving spectrum; performing phase randomization and inverse fast Fourier transform (IFFT) on the normalization driving spectrum, and performing frame lap joint to obtain true random signals; performing calculation update to obtain current driving root mean square gain; and multiplying the driving root mean square gain by driving frame data after the lap joint to calculate and obtain driving output signals of the current frame. Compared with conventional random vibration test control, through the method, not only can the satisfactory spectrum control of the non-stationary random vibration be obtained, but also the non-stationary random signal root mean square can be stably controlled to vary with a time curve, and it is effective and feasible to adopt the control method to implement non-stationary random vibration test control.

Description

technical field [0001] The invention relates to a non-stationary random vibration test control method with electric or hydraulic vibration table (with products), vibration excitation system and vibration exciter as control objects, especially suitable for simulating vehicles (including ground, air and sea) Vehicle) in the non-stationary random vibration environment under unstable working conditions, and the product functionality and reliability assessment vibration test control carried out belongs to the field of automatic control technology. Background technique [0002] Random vibration test is a necessary measure to test product reliability, expose structural material and process defects, and analyze mechanical vibration characteristics. It is an important means to solve various mechanical and structural vibration problems; random vibration test is also a must for military equipment environmental tests One of the projects, it has played a huge role in product assessment; ...

AI Technical Summary

Problems solved by technology

However, there are still few literatures on the control of non-stationary random vibration experiments.

[0005] After searching patent and non-patent literature, there is no published relevant literature on the control method of non-stationary random vibration test, let alone related products used in applications

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