QFT/Hinfinity Controller Deign of an MIMO Suspension System

• Main Authors: Lin, Bao-Tung, 林保童
• Other Authors: Teng, Ching-Cheng
• Format: Others
• Language: en_US
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/95107172884095861646

博士 === 國立交通大學 === 電控工程研究所 === 98 === This dissertation uses a combined design method for the quarter-model vehicle suspension system to design a controller for the multi-input multi-out (MIMO) control algorithm. This research calculates the controller parameters of the quarter-model suspension system by the mixed-sensitivity standard regular structure. The controller of the main structure containing three weighting functions, sensitivity weighting function , control effort weighting function , and complementary weighting function . The sensitivity weighting function, weighted for low frequency, shapes sensitivity function . Choosing to be small inside the desired control bandwidth to achieve good disturbance attenuation (i.e., performance), and choosing to be small outside the control bandwidth, help to ensure a good stability margin (i.e., robustness). A control effort weighting function confines the system gain at high frequency, to suppress sensor noise disturbance, and adjusts the gain decay speed at high frequency. The combined techniques copy a 2-degree-of-freedom (2DOF) system. This dissertation proposes two-types of design methodologies. The first design method describes the robust control method, by which the 1-degree-of-freedom (1DOF) structure designs the controller. The second design method adds a pre-filter into the 1DOF, or the 2DOF structure. The current study uses this structure to outcome tracking by the classical control theory, and applies the combined design procedures in the vehicle quarter-model suspension system, such that displacement of the MIMO suspension system lies in the given boundaries. Keywords: QFT/ robustness, Weighting function, MIMO system