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Identification and Modeling Method for Pneumatic Position Servo System


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Identification and Modeling Method for Pneumatic Position Servo System
BAI Yan-hong12LI Xiao-ning1
1.School of Mechanical Engineering,NUST,Nanjing 210094,China;2.School of ElectronicsInformation Engineering,Taiyuan University of Science and Technology,Taiyuan 030024,China
proportional flow valve pneumat ic position servo system system identifica tion m athematic mode l
Due to the strong nonlinearities o f the pneumatic position servo system, it is d ifficult to estab lish linearizedmathem aticmode l o f the system that can reveal the system behav iors more precise ly. To so lve the prob lem, a system identificat ionmethod based on the / gray box0 is used to establish the linearized mathemat icmodel o f the pneumatic rotary actuator angu lar position servo system w ith proportional flow valves as the control devices. Considering tha t the dynam ics o f the pressure difference is independent of the frict ion, a three-order space state linear model is formed through combining the approx imate linearization dynam ic equation of the pressure differencew ith the mot ion equat ion, and its param eters are obta ined by a closed-loop appo inted-point identif ication method. The resu lts ind icate that themodel established by the proposedmodelingmethod can reflect the characteristics o f the real system and that the feasib ility of the method is conf irmed.


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Last Update: 2007-12-30