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| DOI： |
| Received:June 28, 2005Revised:March 18, 2006 |
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| Coordinating optimization-based sliding mode variable structure control for electro-hydraulic servo system |
| Yong YANG, An LUO, Hua HAN |
| (College of Information Science and Engineering, Central South University, Changsha Hunan 410083, China; Changsha University of Science and Technology, Changsha Hunan 410076, China; College of Electric and Information Engineering, Hunan University, Changsha Hunan 410082, China) |
| Abstract: |
| A sliding mode variable structure control (SMVSC) based on a coordinating optimization algorithm has been developed. Steady state error and control switching frequency are used to constitute the system performance indexes in the coordinating optimization, while the tuning rate of boundary layer width (BLW) is employed as the optimization parameter. Based on the mathematical relationship between the BLW and steady-state error, an optimized BLW tuning rate is added to the nonlinear control term of SMVSC. Simulation experiment results applied to the positioning control of an electro-hydraulic servo system show the comprehensive superiority in dynamical and static state performance by using the proposed controller is better than that by using SMVSC without optimized BLW tuning rate. This succeeds in coordinately considering both chattering reduction and high-precision control realization in SMVSC. |
| Key words: Sliding mode variable structure control(SMVSC) Varying boundary layer Chattering reduction Steady-state performance Coordinating optimization(CO) Electro-hydraulic servo system (EHSS) |
