A Random Wave Reproduction Control Method for Electro-hydraulic Acceleration Servo System

A technology of servo system and control method, which is applied in the field of electro-hydraulic acceleration servo system control and random wave reproduction control of electro-hydraulic acceleration servo system. Convergence and the effect of improving control accuracy

Active Publication Date: 2021-06-29
DALIAN MARITIME UNIVERSITY
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Problems solved by technology

The frequency domain method can identify resonance peaks and resonance valleys in the impedance characteristics, but when the system characteristics change, the method described in the patent is difficult to ensure the convergence of the impedance identification results, which in turn affects the control accuracy of the waveform reproduction under the system time-varying condition

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  • A Random Wave Reproduction Control Method for Electro-hydraulic Acceleration Servo System
  • A Random Wave Reproduction Control Method for Electro-hydraulic Acceleration Servo System
  • A Random Wave Reproduction Control Method for Electro-hydraulic Acceleration Servo System

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Embodiment Construction

[0032] The present invention will be further described below in conjunction with the accompanying drawings. Such as figure 1 As shown, a random wave reproduction control method of an electro-hydraulic acceleration servo system includes the following steps:

[0033] A. Set the initial value of the number of iterations n, let n=1.

[0034] B. Assuming that the acceleration time-domain random wave reference signal is R(t), R(t) is transformed into R(f) through the Fourier transform module A1, and R(f) is the Fourier of the acceleration time-domain random wave reference signal The leaf transform signal is the acceleration frequency domain reference signal.

[0035] C. Combine R(f), D n-1 (f), C n-1 (f) and Z n-1 (f) input to the acceleration drive signal generation module 9, calculate the frequency domain drive signal D during the nth iteration n (f), the calculation formula is:

[0036]

[0037] Symbols in the formula Indicates the Hadamard product; D n-1 (f) is the ...

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Abstract

The invention discloses a random wave reproduction control method of an electro-hydraulic acceleration servo system, which identifies the impedance characteristics of the electro-hydraulic acceleration servo system based on a frequency domain method, and can ensure accurate identification of resonance peaks and resonance valley frequency bands in the impedance characteristics of the electro-hydraulic acceleration servo system , thereby ensuring the control accuracy of the waveform reproduction of the resonant peak or resonant valley frequency band. Moreover, the present invention corrects the impedance in real time according to the input and output characteristics of the electro-hydraulic acceleration servo system under the time-varying condition, and the correction calculation method can ensure the convergence of the impedance correction result, thus improving the waveform reproduction under the time-varying condition of the electro-hydraulic acceleration servo system control precision. The invention can control the time-domain peak value error between the acceleration output signal and the acceleration reference signal of the electro-hydraulic acceleration servo system within 15%. The operating cycle of the invention is less than 1 ms, which can meet the experimental requirements of random wave reproduction of the electro-hydraulic acceleration servo system, and is easy to realize by computer digital control.

Description

technical field [0001] The invention relates to a control method of an electro-hydraulic acceleration servo system in the mechanical field, in particular to a random wave reproduction control method of an electro-hydraulic acceleration servo system. Background technique [0002] The purpose of the vibration simulation experiment is to assess the structural reliability and operational reliability of the test piece under vibration excitation. It is currently widely used in aviation, aerospace, automobile, construction and other industrial fields and departments. The electro-hydraulic vibration table is easy to realize the vibration excitation of low frequency, large displacement and large thrust. It has a firm structure and a large load capacity. It is often used in vibration simulation experiments of large structures or specimens. The electro-hydraulic acceleration servo system is the core technology of the electro-hydraulic vibration table. With the help of the electro-hydr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05B13/04
Inventor 关广丰徐显桩熊伟王海涛马文琦
Owner DALIAN MARITIME UNIVERSITY
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