Extremum seeking-based online identification of spatially cyclic disturbances for rotating systems

作     者：Qingquan liu Xin Huo Kang-Zhi Liu Minghui Chu Aijing Wu 

作者机构：Control and Simulation Center Harbin Institute of Technology Harbin 150080 P.R. China Department of Electrical and Electronic Engineering Chiba University Chiba 263-8522 Japan 

出 版 物：《IFAC-PapersOnLine》 

年 卷 期：2023年第56卷第2期

页      面：8764-8769页

主　　题：Spatially cyclic disturbance Extremum seeking (ES) Envelope curve Online identification Identification for control 

摘      要：Spatially cyclic disturbances widely exist in rotating systems. They seriously affect the position and velocity tracking accuracy of the system. The precondition of rejecting disturbances is to obtain their related information. However, such disturbances are difficult to estimate since their time periods are generally time-varying and change with the velocity. In this paper, an extremum seeking (ES) based online identification method of spatially cyclic disturbance is proposed. The construction method of performance function is put forward, where it includes a band-pass filter and a notch filter. Besides, the envelope curve is used to outline the amplitude of periodic function in real-time. Further, the extreme value analysis of the ES-based identifier is derived. This method is independent of system parameters. The simulation results validate that the spatial cycle and amplitude of such disturbance can be accurately identified online during one operation, even if the system is still in a transient state.