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Control of magnetic levitation positioning stage with an eddy current damper
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作者 王伟明 闪明才 +1 位作者 马树元 唐水源 《Journal of Beijing Institute of Technology》 EI CAS 2012年第3期315-320,共6页
To enhance the system damping,a permanent magnet set which served as an eddy current damper was added to the magnetic levitation positioning stage which consists of a moving table,four Halbach permanent magnetic array... To enhance the system damping,a permanent magnet set which served as an eddy current damper was added to the magnetic levitation positioning stage which consists of a moving table,four Halbach permanent magnetic arrays,four stators and displacement sensors.The dynamics model of this stage was a complex nonlinear,strong coupling system which made the control strategy to be a focus research.The nonlinear controller of the system was proposed based on the theory of differential geometry.Both simulation and experimental results show that either the decoupling control of the movement can be realized in horizontal and vertical directions,and the control performance was improved by the damper,verifying the validity and efficiency of this method. 展开更多
关键词 magnetic levitation(maglev) positioning stage eddy current damper nonlinear control feedback linearization
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智能阀门定位器流量特性非线性修正及控制 被引量:2
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作者 王庭康 《铜业工程》 CAS 2018年第1期87-89,94,共4页
智能阀门定位器因具有控制精度高,可靠性强等优点,被广泛应用于工业流量控制领域中。智能阀门定位器包括线性、等比、快开和自主设定等流量特性。作者通过曲线拟合的方法,得到了智能型阀门定位器的流量特性函数。经实验发现,定位器误差... 智能阀门定位器因具有控制精度高,可靠性强等优点,被广泛应用于工业流量控制领域中。智能阀门定位器包括线性、等比、快开和自主设定等流量特性。作者通过曲线拟合的方法,得到了智能型阀门定位器的流量特性函数。经实验发现,定位器误差主要来源于反馈机械自身的非线性因素。因此,通过研究阀门定位器的非线性修正和控制,对开关控制算法进行优化,有效地缩短了调整时间,进一步提高了阀门定位器的流量控制精度。 展开更多
关键词 智能阀门定位器 流量特性 位置反馈 非线性修正 控制算法
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Adaptive sliding mode control of the A-axis used for blisk manufacturing 被引量:7
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作者 Zhao Pengbing Shi Yaoyao 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2014年第3期708-715,共8页
As a key assembly in the 5-axis CNC machine tools, positioning precision of the A-axis directly affects the machining accuracy and surface quality of the parts. First of all, mechanical structure and control system of... As a key assembly in the 5-axis CNC machine tools, positioning precision of the A-axis directly affects the machining accuracy and surface quality of the parts. First of all, mechanical structure and control system of the A-axis are designed. Then, considering the influence of nonlin- ear friction, backlash, unmodeled dynamics, uncertain cutting force and other external disturbance on the control precision of the A-axis, an adaptive sliding mode control (ASMC) based on extended state observer (ESO) is proposed. ESO is employed to estimate the state variables of the unknown system and an adaptive law is adopted to compensate for the input dead-zone caused by friction, backlash and other nonlinear characteristics. Finally, stability of the closed-loop system is guaran- teed by the Lyapunov theory. Positioning experiments illustrate the perfect estimation of ESO and the stronger anti-interference and robustness of ASMC, which can improve the control precision of the A-axis by about 40 times. Processing experiments show that the ASMC can reduce the waviness, averaKe error and roughness of the nrocessed surface by 35.63%, 31.31% and 30.35%, respectively. 展开更多
关键词 A-axis Blisk processing nonlinear compensation positioning control Sliding mode control
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