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.