Method for controlling random vibration of electrohydraulic servo system based on RLS filters

Abstract

The invention discloses a method for controlling the random vibration of an electrohydraulic servo system based on RLS filters, which comprises the following steps: converting an acceleration power spectral density reference signal into an acceleration time domain driving signal; taking an acceleration input signal of the electrohydraulic servo system as that of an RLS filter I; online regulating weights of the RLS filter I and an RLS filter II in real time by using an RLS adaptive filter algorithm and performing identification on a frequency response function of the electrohydraulic servo system and an impedance function of the RLS filter I respectively; and constructing a filter III based on the identification result of the impedance function of the RLS filter II, filtering the acceleration time domain driving signal and taking an output signal of the filtration as the acceleration input signal of the electrohydraulic system. The convergence property of the RLS adaptive filter algorithm adopted by the method guarantees the convergence property of the real-time online iteration of acceleration power spectral density when the characteristics of the electrohydraulic servo system and a test piece are changed.

Description

technical field [0001] The invention relates to a vibration simulation experiment method in the mechanical field, in particular to a random vibration control method of an electro-hydraulic servo system based on an RLS filter. Background technique [0002] Vibration simulation is a kind of environmental simulation and simulation experiment, and it is widely used in defense industry fields such as aviation, aerospace, nuclear industry and civil industry sectors such as automobile and construction. The purpose of the vibration test is to assess the ability of the product to maintain its original performance under vibration excitation, that is, to study and test the structural reliability and operational reliability of the product under vibration conditions. From the perspective of experiment type, vibration simulation experiments can be divided into three types: random vibration, sinusoidal vibration and waveform reproduction. The vibration conditions of the environment are ge...

AI Technical Summary

Problems solved by technology

The essence of the existing algorithm is an off-line iterative algorithm. When the parameters of the electro-hydraulic servo system or the characteristics of the specimen change during the experiment, the convergence of the iterative algorithm cannot be guaranteed, and even the iteration diverges, resulting in the power spectral density output signal of the system and the power Compared with the spectral density reference signal, there is a large deviation, which greatly reduces the accuracy of power spectral density reproduction and affects the quantitative evaluation of the reliability of the tested product in a vibration environment

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