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由于液压系统的特点以及Stewart平台的结构特性,使液压驱动Stewart平台得到越来越广泛的应用。针对液压驱动Stewart平台,联合平台的运动学和动力学,构建了整个位姿系统的模型;研究了平台的位姿控制策略,并进行了频率特性分析和仿真分析,验证了控制策略的有效性。 相似文献
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位姿水平的冗余自由度机械臂运动学逆解算法 总被引:1,自引:0,他引:1
本文通过分析七自由度机械臂构造特点,用曲面几何理论得到肘关节在笛卡尔空间中的点集,参考各关节角运动范围,可以求出冗余自由度机械臂逆运动学的全部构型解,从而可以方便地实现实现机械臂的全局优化。此方法既提高了解的精度,又减少了运算量,同时为速度解的解算提供了便利条件和新的思路。 相似文献
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液压驱动的多冗余机械臂用常规方法很难实现实时、精确的自动化控制,提出了一种基于几何理论的数值迭代算法,能快速地求解出多冗余机械臂的运动学逆解,并利用此算法对混凝土泵车的臂架系统进行了模拟仿真,仿真结果表明,此算法符合泵车臂架系统的实时自动化控制。 相似文献
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液压驱动机械臂运动控制系统是一种时变且强耦合的非线性控制系统,在面对复杂的作业场景中需要更为精确的运动规划,针对液压驱动机械臂运动控制系统运动轨迹控制精度问题,在液压驱动机械臂运动学模型基础上,对传感器输出信号进行双闭环平均值滤波处理,通过对机械臂逆运动学进行求解,采用动态规划控制算法对液压驱动机械臂进行运动轨迹的最优控制,最后在液压驱动机械臂集成测试环境中验证算法的可靠性和准确性,实验结果表明,采用动态规划算法能够快速提升液压机械臂的运动控制精确度,满足机械臂的实时控制需求。 相似文献
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电液比例控制用输入的电信号来调制液压参数,使之连续成比例的变化,具有控制原理简单、控制精度高、抗污染能力强、价格适中等特点,受到人们的普遍重视。综述了电液比例控制技术的国内外发展现状及发展趋势。通过对配电带电作业机器人作业平台的高空作业车举升臂系统的分析与研究,提出了电液比例技术适用于高空作业车举升臂液压驱动系统。 相似文献
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针对液压机械手的电液比例系统存在较大程度的系统参数变化和负载干扰等特点,一般控制方法难以全部满足性能要求。常规PID控制方法虽然算法简单、可靠性好、鲁棒性高,但由于参数整定繁杂,往往造成参数整定不良、性能欠佳、适用性能差。为了改善这些缺陷,将模糊控制理论与PID控制理论相结合,设计了模糊PID控制器,实现了对PID参数的在线整定。利用MATLAB/Simulink进行仿真,比较常规PID控制与模糊PID控制下电液比例系统的控制效果,发现模糊PID控制器较好地克服了系统的非线性和负载干扰的影响,提高了系统的稳定性和动态性能。 相似文献
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为了满足某液压机器人对于特殊工况下的混凝土振捣需求,设计了基于导纳算法的柔顺控制器.以电液比例阀控缸系统为研究对象,建立了系统的动态数学模型,并利用 MATLAB 、 AMESim 和 Simcenter3D 软件各自优势,搭建了一种多学科融合的机电液一体化联合仿真平台,对电液比例阀控缸系统进行了弹簧阻尼负载和刚性碰撞 2 种不同工况下的多算法联合对比仿真分析.结果表明,设计的导纳柔顺控制器使得电液比例系统具备了对环境刚度的快速响应能力,导纳算法可根据实际负载力对内环位置控制器的位移信号进行及时修正,有效避免剧烈的刚性碰撞,体现良好的柔顺性和鲁棒性. 相似文献
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ZHOU Hua ZHANG Zengmeng GAO Yuan'an YANG Huayong 《机械工程学报(英文版)》2010,23(4):418-427
Water-assisted injection molding(WAIM), an innovative process to mold plastic parts with hollow sections, is characterized with intermittent, periodic process and large pressure and flow rate variation. Energy savings and injection pressure control can not be attained based on conventional valve control system. Moreover, the injection water can not be supplied directly by water hydraulic proportional control system. Poor efficiency and control performance are presented by current trial systems, which pressurize injection water by compressed air. In this paper, a novel water hydraulic system is developed applying an accumulator for energy saving. And a new differential pressure control method is proposed by using pressure cylinder and water hydraulic proportional pressure relief valve for back pressure control. Aiming at design of linear controller for injection water pressure regulation, a linear load model is approximately built through computational fluid dynamics(CFD) simulation on two-phase flow cavity filling process with variable temperature and viscosity, and a linear model of pressure control system is built with the load model and linearization of water hydraulic components. According to the simulation, model based feedback is brought forward to compensate the pressure decrease during accumulator discharge and eliminate the derivative element of the system. Meanwhile, the steady-state error can be reduced and the capacity of resisting disturbance can be enhanced, by closed-loop control of load pressure with integral compensation. Through the developed experimental system in the State Key Lab of Fluid Power Transmission and Control, Zhejiang University, China, the static characteristic of the water hydraulic proportional relief valve was tested and output pressure control of the system in Acrylonitrile Butadiene Styrene(ABS) parts molding experiments was also studied. The experiment results show that the dead band and hysteresis of the water hydraulic proportional pressure relief valve are large, but the control precision and linearity can be improved with feed-forward compensation. With the experimental results of injection water pressure control, the applicability of this WAIM system and the effect of its linear controller are verified. The novel proposed process of WAIM pressure control and study on characteristics of control system contribute to the application of water hydraulic proportional control and WAIM technology. 相似文献
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步进式加热炉电液比例液压系统的设计 总被引:2,自引:0,他引:2
步进炉作为高速线材、棒材、及板材轧线的主要设备之一,炉底机械驱动部分为电液比例液压系统。对步进炉炉底机械电液比例系统及典型回路进行分析,该技术以其高效率和性价比将得到广泛应用,值得进一步推广。 相似文献
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