共查询到18条相似文献,搜索用时 93 毫秒
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采用牛顿-欧拉法建立了空间并联机构的动力学方程,用于研究4-UPS-UPU五自由度空间并联机构的刚体动力学建模。分析了4-UPS-UPU并联机构的支链受力和动平台受力情况,基于牛顿-欧拉法推导出了该并联机构的刚体动力学方程。利用Matlab分别对动平台在空载和加载条件下的驱动力进行理论计算,得到了该机构5个驱动杆的驱动力。最后,利用ADAMS对4-UPS-UPU并联机构虚拟样机进行了动力学仿真分析。结果表明:并联机构在Z轴为0.95m的平面内按半径为0.01m的圆轨迹运动时,驱动杆1受力最大,空载时最大值达-760.6N,加载时最大值达-889.7N。理论计算结果和虚拟样机仿真结果基本一致,验证了理论模型的正确性。该项研究为4-UPS-UPU五自由度并联机构物理样机的制造奠定了理论基础,也为其他空间并联机构刚体动力学建模提供了思路。 相似文献
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3-RPS并联机器人动力学分析及控制 总被引:1,自引:0,他引:1
运用牛顿—欧拉方法建立3-RPS并联机器人机构的逆动力学模型。通过使用Simmechanics将并联机器人物理模型导入Matlab/Simulink中,利用Simulink对机构进行动力学仿真以及验证机构的逆动力学模型。针对并联机器人的建模不确定性,提出一种基于不确定性系统的鲁棒控制方案,即分别通过基于标称模型设计系统的计算力矩控制器,来镇定标称系统;通过构建Lyapunov函数来构建系统的鲁棒补偿控制器,来消除由于建模不确定性引起的跟踪误差。通过将控制模型导入Simulink中对其控制效果进行验证,其具有较低的稳态误差精度,效果优于计算力矩控制策略。 相似文献
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6-UPS型并联机构的刚体动力学模型 总被引:15,自引:0,他引:15
建立了6-UPS型并联机构的动力学模型。为了能使动力学模型包含所有构件的重力和惯性力,以6-UPS并联机构的支链为研究对象,运用D-H方法建立了各构件的坐标系,推导了支链的运动学反解的解析方程,并给出了各个构件的速度、加速度与动平台的速度、加速度的映射关系。然后用牛顿-欧拉方法推导了6-UPS并联机构的动力学模型,为支链中各个构件支反力的求解和整个机构的动力学分析奠定了基础。最后以并联机床为例,运用动力学模型进行了实际计算并绘制了连杆驱动力的变化曲线。 相似文献
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《计算机集成制造系统》2014,(7)
为了研究三维转动两维移动4-UPS-RPS空间五自由度并联机构的刚体动力学问题,采用牛顿—欧拉法和虚拟样机仿真相结合的刚体动力学分析方法,分析了该并联机构的运动学,包括位置反解、并联机构驱动杆线速度和角速度,以及并联机构摆动杆和伸缩杆质心处线速度和角加速度;采用牛顿—欧拉法建立了4-UPS-RPS空间并联机构的刚体动力学模型,利用MATLAB对空载和有载荷条件下的算例进行了理论计算,分别求解出机构五个驱动杆的驱动力,利用ADAMS进行了机构虚拟样机的动力学仿真分析,验证了理论计算的正确性。该研究为4-UPS-RPS空间五自由度并联机构的设计制造和控制奠定了理论基础。 相似文献
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Yunn-Lin Hwang 《The International Journal of Advanced Manufacturing Technology》2006,29(5-6):598-604
The main objective of this paper is to develop a recursive formulation for the flexible dynamic manufacturing analysis of
open-loop robotic systems. The nonlinear generalized Newton-Euler equations are used for flexible bodies that undergo large
translational and rotational displacements. These equations are formulated in terms of a set of time invariant scalars, vectors
and matrices that depend on the spatial coordinates as well as the assumed displacement fields. These time invariant quantities
represent the dynamic manufacturing couplings between the rigid body motion and elastic deformation. This formulation applies
recursive procedures with the generalized Newton-Euler equations for flexible bodies to obtain a large, loosely coupled system
equation describing motion in flexible manufacturing systems. The techniques used to solve the system equations can be implemented
in any computer system. The algorithms presented in this investigation are illustrated using cylindrical joints for open-loop
robotic systems, which can be easily extended to revolute, slider and rigid joints. The recursive Newton-Euler formulation
developed in this paper is demonstrated with a robotic system using cylindrical mechanical joints. 相似文献
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The classical natural coordinate modeling method which removes the Euler angles and Euler parameters from the governing equations is particularly suitable for the sensitivity analysis and optimization of multibody systems. However, the formulation has so many principles in choosing the generalized coordinates that it hinders the implementation of modeling automation, A first order direct sensitivity analysis approach to multibody systems formulated with novel natural coordinates is presented. Firstly, a new selection method for natural coordinate is developed. The method introduces 12 coordinates to describe the position and orientation of a spatial object. On the basis of the proposed natural coordinates, rigid constraint conditions, the basic constraint elements as well as the initial conditions for the governing equations are derived. Considering the characteristics of the governing equations, the newly proposed generalized-ct integration method is used and the corresponding algorithm flowchart is discussed. The objective function, the detailed analysis process of first order direct sensitivity analysis and related solving strategy are provided based on the previous modeling system Finally, in order to verify the validity and accuracy of the method presented, the sensitivity analysis of a planar spinner-slider mechanism and a spatial crank-slider mechanism are conducted. The test results agree well with that of the finite difference method, and the maximum absolute deviation of the results is less than 3%. The proposed approach is not only convenient for automatic modeling, but also helpful for the reduction of the complexity of sensitivity analysis, which provides a practical and effective way to obtain sensitivity for the optimization problems of multibody systems. 相似文献
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平面3R操作臂动力学分析 总被引:1,自引:0,他引:1
操作臂是搬运机器人的关键部分,机器人作业主要依赖于操作臂的运动.针对采用D-H法建立运动学模型的平面三自由度旋转关节操作臂,在其运动规划基础上应用牛顿-欧拉法求解动力学方程.该方法建立在相邻连杆之间约束力和力矩的分析之上,具有方便直观、易于迭代求解的特点.在求出动力学方程后,将操作臂设计方案初始参数带入方程,验证了方程... 相似文献
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D. V. Kuz’min 《Journal of Machinery Manufacture and Reliability》2007,36(1):76-79
Dynamic equations of a holonomic system in generalized coordinates with distributed link masses are obtained with the connected graph method. It is shown that these equations are identical to the equations obtained from the dynamic equations of this system in the Lagrange form. The structure of these equations is analogous to the structure of the equations of dynamics of a holonomic system with localized masses. They can be used as a mathematical base for algorithms for producing equations of multilink mechanism dynamics. 相似文献
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六自由度并行机器人动力学模型及仿真 总被引:2,自引:0,他引:2
采用一种广泛应用于串行机器人动力学建模的方法──自然正交补(NOC)法, 结合d’Alembert虚功原理,推导出了不含约束力的六自由度并行机器人动力学模 型,并将它写成机器人动力学模型的一般形式,从而证明了在广义力对应的广义坐 标下,其惯性阵是对称、正定的。以此模型为基础,对一个典型运动进行了动力学仿 真,仿真结果验证了此模型的有效性。 相似文献
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柔性多体动力学在工程机械设计中的应用研究 总被引:3,自引:0,他引:3
将刚柔耦合多体机械系统动力学建模方法应用于工程机械的动力学建模,获得了一组依赖于广义坐标的微分/代数方程组,此即为多体机械系统动力学模型。求解该方程组,可获得机械系统的运动学参量;再引入有限单元网格划分,通过形函数可建立系统运动学参量与系统结构应变之间的关系;该应变关系可用来计算系统结构的动应力和疲劳寿命。文中给出了实现以上思想的基本程序框图,编制了程序DAMSI,并以门座式起重机为实例,说明了本文提出的方法的可行性。 相似文献