Circuit implementation and control of car shock absorber in testing machine hydraulic system

• Main Authors: Lin Chieh-Feng, 林杰鋒
• Other Authors: Yau Her-Terng
• Format: Others
• Language: zh-TW
• Published: 2017
• Online Access: http://ndltd.ncl.edu.tw/handle/m677vh

碩士 === 國立勤益科技大學 === 電機工程系 === 105 === In this paper, dynamic analysis and control of a hydraulic system for an automotive shock absorber testing machine is studied. There exists nonlinear phenomenon i.e., chaotic motion, in a hydraulic system, which leads to complicated motion behaviors. This non-periodic motion will then result in unstable system and damage. It is therefore crucial to control and maintain system stability. In this study, a nonlinear hydraulic system model is built by using nonlinear dynamics. Analysis is carried out on a simulated hydraulic system by deriving dynamic equations. Two different control methods are used to improve the chaos phenomena occurring in the system. A PID controller is adopted in the first method, in which a PSO algorithm is used to determine the optimal PID parameters for the nonlinear system. The second method employs Sliding Mode Control (SMC). The two control methods are observed for feasibility and implemented with circuits so that the data matches that of the actual hydraulic system.