共查询到18条相似文献,搜索用时 140 毫秒
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基于足端轨迹规划算法的液压四足机器人步态控制策略 总被引:17,自引:0,他引:17
设计一种液压四足机器人仿生机构,通过设定相应的坐标系为机器人进行运动学建模,并对行走过程中单腿的相位关系进行了分析。针对行走过程中足端的拖地、滑动和接触冲击等问题,提出一种零冲击的足端轨迹规划改进算法,并实现了步态规划算法设计。步态规划根据步态中各腿间的相位关系,借助四足机器人运动学模型进行逆运动学解算,求出各腿的关节角度函数,利用机构的几何关系得到各液压缸伸缩量控制函数,对试验样机各腿进行伺服驱动控制,从而实现液压四足机器人的步态规划行走。仿真试验结果表明,在该策略驱动控制下液压四足机器人行走过程连续平稳,样机足端轨迹较为平滑,躯干起伏较小,证明了该足端轨迹规划方法用于四足机器人步态设计的合理性和有效性。 相似文献
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《机械设计与制造》2015,(8)
介绍了一种液压驱动跳跃六足机器人的模型,分别进行了该机器人侧面双腿和正面双腿竖直跳跃运动学分析与动力学分析。采用D-H法,提出了一种液压驱动六足跳跃机器人模型,并建立了其着地和腾空两阶段的运动学分析模型;采用拉格朗日方程分析其动力学,得到了该机器人结构在运动过程中各关节的输出力矩特性。最后基于Adams软件对双腿跳跃六足机构和其质心轨迹进行了仿真,分析了其跃障能力,优化了两种跳跃方式的跳跃倾角,并比较了这两种跳跃方式效率,仿真结果验证了六足机构的运动平稳性,较好的越障能力,侧腿跳效率更优,获得侧面和正面双腿跳跃的最佳倾角,为后续研究工作提供了理论支撑。 相似文献
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以四足机器人关节驱动器 液压驱动单元为研究对象,依据液压驱动单元的结构组成原理,采用机理建模的方法,建立其力控系统数学模型,该模型包含了基于辨识得到的伺服阀三阶传递函数、伺服阀的压力 流量非线性环节、伺服缸两腔容积变化因素等。建立液压驱动单元力控系统框图,并利用MATLAB/Simulink平台建立其仿真模型,采用实验测试与仿真分析相结合的方法,研究不同工作参数和不同给定信号下的液压驱动单元力控性能。研究结果表明:比例增益、供油压力、力阶跃量及正弦频率等参数均会对液压驱动单元的力控性能产生影响,该研究工作对四足机器人各关节高性能的力控方法研究提供了理论和实验基础。 相似文献
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Force control compensation method with variable load stiffness and damping of the hydraulic drive unit force control system 总被引:1,自引:0,他引:1
Each joint of hydraulic drive quadruped robot is driven by the hydraulic drive unit (HDU), and the contacting between the robot foot end and the ground is complex and variable, which increases the difficulty of force control inevitably. In the recent years, although many scholars researched some control methods such as disturbance rejection control, parameter self-adaptive control, impedance control and so on, to improve the force control performance of HDU, the robustness of the force control still needs improving. Therefore, how to simulate the complex and variable load characteristics of the environment structure and how to ensure HDU having excellent force control performance with the complex and variable load characteristics are key issues to be solved in this paper. The force control system mathematic model of HDU is established by the mechanism modeling method, and the theoretical models of a novel force control compensation method and a load characteristics simulation method under different environment structures are derived, considering the dynamic characteristics of the load stiffness and the load damping under different environment structures. Then, simulation effects of the variable load stiffness and load damping under the step and sinusoidal load force are analyzed experimentally on the HDU force control performance test platform, which provides the foundation for the force control compensation experiment research. In addition, the optimized PID control parameters are designed to make the HDU have better force control performance with suitable load stiffness and load damping, under which the force control compensation method is introduced, and the robustness of the force control system with several constant load characteristics and the variable load characteristics respectively are comparatively analyzed by experiment. The research results indicate that if the load characteristics are known, the force control compensation method presented in this paper has positive compensation effects on the load characteristics variation, i.e., this method decreases the effects of the load characteristics variation on the force control performance and enhances the force control system robustness with the constant PID parameters, thereby, the online PID parameters tuning control method which is complex needs not be adopted. All the above research provides theoretical and experimental foundation for the force control method of the quadruped robot joints with high robustness. 相似文献
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Design and simulation for a hydraulic actuated quadruped robot 总被引:1,自引:0,他引:1
Rong Xuewen Li Yibin Ruan Jiuhong Li Bin 《Journal of Mechanical Science and Technology》2012,26(4):1171-1177
This paper describes the mechanical configuration of a quadruped robot firstly. Each of the four legs consists of three rotary
joints. All joints of the robot are actuated by linear hydraulic servo cylinders. Then it deduces the forward and inverse
kinematic equations for four legs with D-H transformation matrices. Furthermore, it gives a composite foot trajectory composed
of cubic curve and straight line, which greatly reduces the velocity and acceleration fluctuations of the torso along forward
and vertical directions. Finally, dynamics cosimulation is given with MSC.ADAMS and MATLAB. The results of co-simulation provide
important guidance to mechanism design and parameters preference for the linear hydraulic servo cylinders. 相似文献
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基于螺旋理论的冗余液压驱动四足机器人运动学分析 总被引:1,自引:0,他引:1
四足机器人的各种研究大多基于四条腿弯曲方向一致展开的。对于液压驱动且具有冗余度的四足机器人,静止姿态下,其前面两条腿与后面两条腿成对称弯曲状。为了研究这种机器人单腿运动和躯体运动状态,文中建立了基于螺旋理论的液压驱动四足机器人运动学模型,包括给出了单腿串联运动学逆解和躯体并联运动学正解。然后根据机器人行走过程设计出后面两条腿的髋关节与膝关节摆幅角度,通过建立的运动学模型,得到前面两条腿的关节变量及躯体姿态。最后通过MATLAB数值仿真和ADAMS虚拟样机实验,对机器人在一种行走方案下的躯体运动姿态进行仿真对比,验证了所建运动学模型的可靠性。 相似文献
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液压四足机器人机身扰动抑制及实验研究 总被引:2,自引:0,他引:2
针对液压四足机器人在运动过程中的机身扰动较大的问题,提出基于运动学和虚拟模型的液压四足机器人机身扰动抑制策略。分析机器人机身扰动产生的机理及其影响,建立四足机器人整机运动学方程,根据机器人实时姿态反馈抑制机身扰动。同时在机器人机身横滚和俯仰自由度上引入弹簧阻尼虚拟元件,通过调整虚拟力的大小控制机身姿态。面向机器人对角小跑步态,对机器人摆动相和支撑相进行足端轨迹规划。通过液压四足机器人平台进行实验验证,实验结果表明,该扰动抑制策略能够根据机器人的机身姿态调整关节角度,机器人机身起伏小,机器人实际运动轨迹与理论运动轨迹接近,验证了所提方法的有效性。 相似文献