Energy optimal control of servo-pneumatic cylinders through nonlinear static feedback linearization

Wang, J. and Gordon, T. (2012) Energy optimal control of servo-pneumatic cylinders through nonlinear static feedback linearization. Journal of Dynamic Systems, Measurement and Control, Transactions of the ASME, 134 (5). n/a. ISSN 0022-0434

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Although pneumatic actuators are widely used in industry, they have two major weaknesses-nonlinearities associated with compressibility of air and low energy efficiency. The former limits its applicability whenever accurate positioning is required, and the latter has a negative impact on users through increased energy costs. This paper addresses these issues with the aim of developing a widely applicable servo control strategy, which combines improved tracking accuracy and energy efficiency. A detailed actuator system model is linearized through nonlinear input-output feedback linearization, and the energy optimal velocity profile is derived. Simulation and experimental studies indicate that energy efficiency improvements of 3-7 are possible, while tracking accuracy can be ensured. The method is suitable for real-time implementation and is cost effective; it requires the implementation of an improved velocity profile, while hardware components do not need to be altered. © 2012 American Society of Mechanical Engineers.

Keywords:Actuator system, Energy cost, Energy efficiency improvements, Energy optimal control, Experimental studies, Hardware components, Input-output feedback linearization, IS costs, Nonlinear statics, Optimal controls, Optimal velocity, Real-time implementations, Servo control, Tracking accuracy, Tracking controls, Velocity profiles, Energy efficiency, Nonlinear systems, Pneumatic actuators, Pneumatic equipment, Real time control, Feedback linearization
Subjects:H Engineering > H660 Control Systems
H Engineering > H330 Automotive Engineering
Divisions:College of Science > School of Engineering
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ID Code:11644
Deposited On:23 Aug 2013 10:34

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