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Random waveform reproduction control method for valve-controlled cylinder electro-hydraulic position servo system

An electro-hydraulic position servo and control method technology, which is applied in the mechanical field, can solve problems that affect the waveform control accuracy, and it is difficult to ensure the convergence of impedance identification results, so as to achieve the effect of ensuring convergence and improving control accuracy

Active Publication Date: 2019-05-21
DALIAN MARITIME UNIVERSITY
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  • Claims
  • Application Information

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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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  • Random waveform reproduction control method for valve-controlled cylinder electro-hydraulic position servo system
  • Random waveform reproduction control method for valve-controlled cylinder electro-hydraulic position servo system
  • Random waveform reproduction control method for valve-controlled cylinder electro-hydraulic position 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 waveform reproduction control method of a valve-controlled cylinder electro-hydraulic position servo system includes the following steps:

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

[0034] B. Set the position time-domain random wave reference signal as R(t), transform R(t) into R(f) through the Fourier transform module A1, and R(f) is the Fourier of the position time-domain random wave reference signal The leaf transform signal is the position 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 position driving signal generating module 9, and calculate the frequency domain driving 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 th...

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Abstract

The invention discloses a random waveform reproduction control method for a valve-controlled cylinder electro-hydraulic position servo system. On the basis of a frequency domain method, the impedancecharacteristic of the valve-controlled cylinder electro-hydraulic position servo system is identified, so that the accurate identification of the resonant peak and resonant valley frequency bands in the impedance characteristic of the valve-controlled cylinder electro-hydraulic position servo system can be ensured and thus the control precision of the waveform reproduction of the resonant peak orresonant valley frequency band is ensured. Moreover, the impedance is corrected in real time based on the input and output characteristics under the time-varying condition of the valve-controlled cylinder electro-hydraulic position servo system. With the correction calculation method, the convergence of the impedance correction result is ensured, so that the control precision of the waveform reproduction under the time-varying condition of the valve-controlled cylinder electro-hydraulic position servo system is improved. Therefore, the time domain peak error of the position output signal and the position reference signal of the valve-controlled cylinder electro-hydraulic position servo system can be controlled within 10%. And thus the experimental requirements for random wave reproductionof the valve-controlled cylinder electro-hydraulic position servo system can be met and the method is easy to realize by using the computer numerical control.

Description

technical field [0001] The invention relates to a control method of an electro-hydraulic position servo system in the mechanical field, in particular to a random waveform reproduction control method of a valve-controlled cylinder electro-hydraulic position 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. Valve-controlled cylinder electro-hydraulic position servo system is the core technology of electro-hydraulic vibration table....

Claims

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Application Information

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Patent Type & Authority Applications(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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