Study of Output Feedback Integral Variable Structure System

• Main Authors: Lin, Tsong Ming, 林聰明
• Other Authors: Hong Chin Ming
• Format: Others
• Language: zh-TW
• Published: 1996
• Online Access: http://ndltd.ncl.edu.tw/handle/28948921173657762779

碩士 === 國立臺灣師範大學 === 工業教育學系 === 84 === The purpose of this thesis is to study the design method of output feedback integral variable structure system. Integral variable stucture system has feature of no steady state error. It suppresses the variation of parameters and external disturbance by means of designing a boundary layer, adopts a complicated control law which is not easy to operate. This thesis adopts output feedback method, takes the difference between system output and integrator output, builds a different sliding function, also raises a nonlinear continuous control law to overcome this problem.This sliding function can generate shifting sliding surface to proceed continuous sliding mode control. The time that state point reaches sliding surface will be reduced. The magnitude of nonlinear continuous control law is proportional to the distance between state point and sliding surface. The speed that state point reaches sliding surface will be accelerated. It decreases the influence of variation of parameters and external disturbance when system is in reaching mode. When state point goes into final sliding surface, it becomes small so as to alleviate the chattering phenomena in sliding mode.It gets followig conclusions by digital simulation: The hitting time is reduced. Though it makes the settling time is increased a little by continuous sliding mode, but output is asymptotically stable and no steady state error. System is more insensitive to variation of parameters and external disturbance. As for multi-input/ multi-output condition, the proposed method also can be applied.