标题：Adaptive Stabilization for Feedforward Nonlinear Systems with Unknown Control Direction
作者：Shang Fang; Liu Yun-gang; Zhang Mei; Zhang Xian-fu
作者机构：[Shang Fang; Zhang Mei] Shandong Jianzhu Univ, Sch Informat & Elect Engn, Shandong Prov Key Lab Intelligent Buildings Techn, Jinan 250101, Peoples R C 更多
会议名称：32nd Chinese Control Conference (CCC)
会议日期：JUL 26-28, 2013
来源：2013 32ND CHINESE CONTROL CONFERENCE (CCC)
关键词：Feedforward Nonlinear System; Unknown Control Direction; Adaptive; Control
摘要：This paper investigates the global adaptive stabilization by state feedback for a class of feedforward nonlinear systems with completely unknown control coefficient. To the best of our knowledge, none of the work for the problem has been published up to now. Since the control direction, i.e., the sign of the control coefficient, is unknown, the Nussbaum gain function is used to deal with it. For control convenience, a suitable state transformation is first introduced for the original system. Then, the state feedback controller is proposed based on an appropriate Nussbaum-type function. It is shown that the state of the original system converges to zero while the other sates of the closed-loop system are globally bounded. Finally, a simulation example is given to illustrate the correctness of the theoretical results.