极低静压模拟系统非对称模糊自调整PID控制  

Asymmetric Self-tuning Fuzzy PID Control for Utmost Low Static Pressure Simulator

作　　者：李罡[1] 李宝仁[1] 杨钢[1] 杜经民[1] 

机构地区：[1]华中科技大学机械学院FESTO气动中心,湖北武汉430074

出　　处：《液压与气动》2015年第10期64-68,共5页Chinese Hydraulics & Pneumatics

摘　　要：极低静压模拟系统以真空泵为负压源,由于真空泵抽气能力随模拟压力降低呈非线性降低,导致系统具有强非线性和非对称性。针对线性控制器难以克服非对称性影响,且不能够获得大范围性能一致性的难题,提出一种非对称模糊自调整PID控制策略。该控制方法根据系统特性,结合模糊逻辑构建非对称模糊自调整机构对PID控制器参数在线调整,以适应系统特性的非线性变化。仿真结果表明:该控制方法可以克服系统非对称性,在大范围内获得良好的控制性能。The negative pressure source of the utmost low static pressure simulator （ULSPS） is a vacuum pump, as the extraction capability of the vacuum pump nonlinear reducing with the pressure of the simulator; the ULSPS is strongly nonlinear and asymmetric. A new asymmetric self-tuning fuzzy PID controller is proposed to deal with the difficulty that the control precision of the linear controller is poor due to the strong asymmetry. The new controller is combined with the feature of the ULSPS and the fuzzy logic to tune the parameters of the PID controller online. The simulation results show that the proposed controller can overcome the nonlinearity, and the control performance is good in wide-range.

关 键 词：极低静压模拟 非对称性 非线性 模糊自调整 

分 类 号：TH138[机械工程—机械制造及自动化]