A random vibration control method of electro-hydraulic servo system based on rls filter

Abstract

The invention discloses a random vibration control method of an electro-hydraulic servo system based on an RLS filter, comprising the following steps: converting an acceleration power spectral density reference signal into an acceleration time-domain driving signal; and using the acceleration input signal of the electro-hydraulic servo system as an RLS The acceleration input signal of filter I; the weights of RLS filter I and RLS filter II are adjusted online in real time by using the RLS adaptive filtering algorithm, and the frequency response function of the electro-hydraulic servo system and the impedance function of RLS filter I are identified respectively; based on Based on the identification results of the impedance function of the RLS filter II, the filter III is constructed, and the acceleration time-domain driving signal is filtered, and its output signal is used as the acceleration input signal of the electro-hydraulic servo system. The convergence of the RLS self-adaptive filtering algorithm adopted in the invention ensures the convergence of the real-time online iteration of the acceleration power spectrum density when the characteristics of the electro-hydraulic servo system and the characteristics of the test piece change.

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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