Waveform reproduction control method of electro-hydraulic servo system based on Kalman filter

Abstract

The invention discloses a waveform reproduction control method of an electro-hydraulic servo system based on a Kalman filter, comprising the following steps of: setting a reference signal; utilizing single-step prediction Kalman filtering algorithm to adjust the weight number of a Kalman filter I, identifying frequency response function of the electro-hydraulic servo system, and constructing a filter IV on the basis of identification result; delaying the reference signal; utilizing the single-step prediction Kalman filtering algorithm to adjust the weight number of a Kalman filter II, identifying impedance function of the Kalman filter I, and constructing a filter III on the basis of identification result; and using the filter III to filter the reference signal, and taking the output signal as a position input signal of the electro-hydraulic servo system. The method utilizes the convergence property of the single-step prediction Kalman filtering algorithm to ensure the identification convergence of the frequency response function and the impedance function of the system when the characteristics of the electro-hydraulic servo system and a test piece are changed, thus guaranteeing the on-line iterative convergence property of a reference waveform.

Description

technical field [0001] The invention relates to a vibration simulation experiment method in the mechanical field, in particular to a waveform reproduction control method of an electro-hydraulic servo system based on a Kalman 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. Environmental vibration conditions are gene...

AI Technical Summary

Problems solved by technology

The essence of the existing algorithm is an offline 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 output waveform of the system being compared with the reference waveform. There is a large deviation, which greatly reduces the accuracy of waveform reproduction and affects the quantitative evaluation of the reliability of the tested product in a vibration environment

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