共查询到9条相似文献,搜索用时 15 毫秒
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FUZZY GLOBAL SLIDING MODE CONTROL BASED ON GENETIC ALGORITHM AND ITS APPLICATION FOR FLIGHT SIMULATOR SERVO SYSTEM 总被引:4,自引:0,他引:4
LIU Jinkun School of Automation Science & Electrical Engineering Beihang University Beijing China HE Yuzhu Department of System Engineering of Engineering Technology Beihang University B eijing China 《机械工程学报(英文版)》2007,20(3):13-17
To alleviate the chattering problem, a new type of fuzzy global sliding mode controller (FGSMC) is presented. In this controller, the switching gain is estimated by fuzzy logic system based on the reachable conditions of sliding mode controller(SMC), and genetic algorithm (GA) is used to optimize scaling factor of the switching gain, thus the switch chattering of SMC can be alleviated. Moreover, global sliding mode is realized by designing an exponential dynamic sliding surface. Simulation and real-time application for flight simulator servo system with Lugre friction are given to indicate that the proposed controller can guarantee high robust performance all the time and can alleviate chattering phenomenon effectively. 相似文献
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基于模糊控制器的无静差跟踪控制方法研究* 总被引:5,自引:0,他引:5
提出了一种基于模糊控制器的无差跟踪控制设计方法,试验结果证明了该方法具有优良的控制特性,达到消除数控伺服系统静差的目的,实现无差跟踪控制,满足机床内联传动链的要求。 相似文献
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气压伺服系统高性能鲁棒控制器的设计 总被引:1,自引:1,他引:1
2自由度控制器越来越在伺服控制中显示其优越性。2自由度控制利用反馈控制来保证稳定性,利用前馈保证轨迹跟踪性能。首先辨识得到了气压系统的闭环传递函数。基于闭环系统辨识模型设计了零相位误差前馈控制器(ZPETC),ZPETC将闭环系统带宽拓宽为100 rad/s左右。系统的干扰抑制能力、鲁棒稳定性由控制器中反馈环节保证。设计了基于干扰观测器的内环反馈控制;外环反馈仍为位置反馈环节。与PID控制比较,整个控制器在试验中得到了良好的轨迹跟踪精度。 相似文献
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电液伺服阀动态相频特性CAT数据处理误差分析 总被引:4,自引:0,他引:4
在计算机辅助测试(CAT)条件下,对电液伺服阀频率响应特性测试数据进行了离散化处理。该处理过程产生了电液伺服阀频率响应特性测试的数据处理误差,误差的大小与数据的离散化程度有关。通过深入分析数据的离散化程度与伺服阀动态相频特性测试误差的关系,指出提高伺服阀频率响应特性测试精度的方法,并用试验验证了理论分析的正确性。 相似文献
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通过直线伺服鲁棒跟踪控制方法提高轮廓加工精度 总被引:2,自引:0,他引:2
为了减小零件加工的轮廓误差,提出了一种采用直线伺服驱动的零相位跟踪控制器(ZPETC)和干扰观测器 (DOB)相结合的鲁棒跟踪控制策略。零相位误差跟踪控制器作为前馈跟踪控制器,提高了快速性,使系统实现准确跟踪;基于干扰观测器的鲁棒反馈控制器补偿了外部扰动、未建模动态、系统参数变化和机械非线性等不确定因素,并根据预测到的干扰信息对各轴进行补偿以消除干扰对系统的影响,从而保证了系统的强鲁棒性能。仿真结果表明所提出的控制方案是有效的,既能实现完好跟踪,又有较强的鲁棒性能,从而提高了轮廓加工精度。 相似文献
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LIU Rong PAN Huachen CHEN Ying Institute of Mechatronic Engineering Hangzhou Dianzi University Hangzhou China 《机械工程学报(英文版)》2007,20(3):50-53
A hybrid control strategy has been designed and developed for the electro-hydraulic posi-tion servo control system with generalized Pulse code modulation (GPCM), which is suitable for the area where the work condition is poor and a large flow rate is required. It is difficult to control the GPCM system because the system is discrete. With consideration of the stability and speediness of the GPCM position servo control system, a control strategy is developed through the theoretical and ex-perimental analyses. The control strategy integrates the merits of Bang-Bang control, PID control and fuzzy control. With this hybrid control strategy, the electro hydraulic control system has good per-formances, and the servo control is carried out with GPCM through on-off valves. 相似文献
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为使精密直线位移装置控制系统的输出响应能够准确而且快速地跟踪输入指令,同时消除由直接驱动带来的负载扰动、切削力波动等因素对系统性能造成的不利影响,针对用于非圆截面零件数控车削的精密直线位移系统,提出一种基于最少拍无波纹控制的零相位误差跟踪控制(Zero phase error tracking control,ZPETC)方案.该方案既能消除不稳定零点导致的系统相位误差,又能提高系统的响应速度.仿真结果表明,基于最少拍无波纹控制的ZPETC方法,有效地改善系统的跟踪性能.系统对于正弦信号的稳态跟踪误差可以达到±0.5 μm,其阶跃响应准确且速度快.与一般精密直线位移装置的控制方法相比,此方法能提高系统的跟踪精度,同时具有良好的抗干扰能力,具有广泛的应用前景. 相似文献