Random vibration control method for electro-hydraulic acceleration servo system

Abstract

The invention discloses a random vibration control method for an electro-hydraulic acceleration servo system. The random vibration control method comprises the following steps of designing a filter by using a density reference signal of an acceleration power spectrum; generating a white noise signal through a white noise generator; taking an output signal of the filter as an input signal of linear convolution; calculating impedance of the electro-hydraulic acceleration servo system; performing inverse fourier transformation; taking an output signal of the linear convolution as an input signal of the electro-hydraulic acceleration servo system and the impedance calculation. All the steps in the method can be implemented through software programming, and the method is higher in instantaneity. According to the random vibration control method, the impedance of the electro-hydraulic acceleration servo system is directly calculated on line by dividing G1(f) from G2(f) instead of depending on a frequency response function. The real-time on-line compensation for the density reference signal of the acceleration power spectrum is realized by the overlap-save method, so that the control precision of a random vibration simulation experiment is improved.

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 acceleration servo system. Background technique [0002] Vibration environment simulation test is a basic test method in modern engineering technology. It is widely used in defense industries such as aviation, aerospace, weapons, ships, and nuclear industries, as well as civil industries such as automobiles and construction. By reproducing the vibration environment conditions of the test piece or structure in the laboratory, to assess the ability of the test piece to maintain its original performance in the vibration environment, to study its structural reliability and operational reliability, and to test the performance of the test piece It provides an important experimental basis for technical improvement. [0003] Most of the vibration forms experienced by the specimen in the working e...

AI Technical Summary

Problems solved by technology

The identification result of the frequency response function has a deviation compared with the real frequency response function of the electro-hydraulic servo system, and the identification of the impedance function of the electro-hydraulic servo system based on the biased frequency response function will inevitably introduce more deviations, resulting in a decrease in the identification accuracy of the impedance function , thus affecting the control accuracy of the random vibration simulation system

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