Abstract
A new control technique is proposed to realize accurate acceleration tracking for repetitive desired acceleration waveforms in an electrohydraulic vibration testing machine. In the proposed algorithm for iterative waveform reformation, the control signal sequence for next operation is determined by utilizing the information of the frequency-response function of the servo mechanism as well as the tracking error obtained from the past operations. It is theoretically clarified first that the stability limit of the iterative reforming process and the convergence speed of the tracking error are predominantly decided by the estimation accuracy of the frequency-response function. Experiments show that nearly perfect tracking can be achieved by using the proposed technique for iterative waveform reformation utilizing the adaptively estimated information of the frequency-response function regardless of kinds of desired waveforms even under operating conditions subjected to inherent highly nonlinearities.
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