Over the past years, more and more concentration has been attended on developing novel control algorithms to stabilize or regulate the practical plant. In this note, a novel technique is presented to improve the control performance by modulating the output error using a sine function. This nonlinear feedback signal is sent to the original control law instead of the output error itself, which is the derivation between the system output and the reference signal. That is the so-called nonlinear feed-back control technique. By virtue of the describing function and the robust control theory, the theoretical analysis shows that the minor control efforts are required to obtain the same control performance due to the merit of the nonlinear feedback scheme. Simulation experiment based on “YULONG” vessel is presented to illustrate the effectiveness of the proposed algorithm.
Zhang, Xian-Ku; Zhang, Guo-Qing; and Chen, Xiu-Jia
"A NOVEL NONLINEAR FEEDBACK CONTROL AND ITS APPLICATION TO COURSE-KEEPING AUTOPILOT,"
Journal of Marine Science and Technology: Vol. 24:
2, Article 13.
Available at: https://jmstt.ntou.edu.tw/journal/vol24/iss2/13