共查询到16条相似文献,搜索用时 234 毫秒
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平面柔性连杆3-RRR并联机器人动力学建模 总被引:1,自引:1,他引:0
为了描述包含柔性连杆的平面柔性3-RRR并联机器人的运动学、动力学特性,需要建立机器人的弹性动力学模型.采用一种适用于刚体、柔体混合的复杂机械系统有限元建模方法,通过分析柔性连杆与刚性动平台的运动学耦舍关系,推导出单元弹性广义坐标相对于系统弹性广义坐标的转换矩阵,利用运动弹性动力学理论,建立了平面柔性3-RRR并联机器人的弹性动力学方程.避免了采用运动学、动力学约束方程的弊端,缩小了方程的规模,缩短了计算时间.用SAMCEF软件验证了模型的准确性.计算实例表明,该模型反映了机器人的弹性振动特性,杆件的弹性变形对机器人的运动误差具有重要影响. 相似文献
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用ADAMS2007建立了一种新型3RRC型并联机器人机构的参数化运动模型,并对该并联机器人机构进行了初步的位置、运动学、动力学分析,获得了有关运动学及动力学特性曲线,还通过Madab软件计算、分析、比较,验证了用ADAMS软件进行动力学仿真分析的可靠性,最后对该模型进行了动力学优化设计,为新型三平移并联机器人机构的应用打下基础。 相似文献
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用三维软件对2-PRR并联机构进行了设计及建模,在ANSYS中对连杆构件用柔性化处理替换了原来的刚性体,通过计算分析了其动力学模态特性。在ADAMS中对2-PRR并联机构进行了运动学和动力学仿真,验证了该机构的正、逆解,并得到了驱动滑块上的驱动力矩变化特性曲线。研究结论为并联机构在雕铣机床和平面抓取机器人中的设计和选用提供了理论依据。所研究的2-PRR并联机构已经在平面雕铣、机器人平面抓取、农业采摘等装备上得到应用。并联机构的动力学分析(正、逆两类问题)是并联机构在机器人、机床动力分析、整机动态设计、动力学尺度综合、控制器参数整定和伺服电机选配的理论基础。 相似文献
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为了描述平面5R柔性并联机器人的运动学和动力学特性,需要建立机器人的运动微分方程。针对刚性活动平台和柔性杆件的运动学耦合特点,改进了一套适用于刚体、柔性体耦合的有限元建模方法,推导出单元弹性广义坐标相对于系统弹性广义坐标的转换矩阵,综合考虑了科氏阻尼、离心刚度和几何非线性的影响,利用运动弹性动力学理论,建立了平面5R柔性并联机器人的运动微分方程,避免了采用运动学和动力学约束方程的弊端,提高了建模精度。计算实例表明,该方程反映了机器人的弹性振动特性,杆件的弹性变形对机器人的运动误差具有重要影响。 相似文献
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弹性机构强度可靠性和运动可靠性是工业机器人、空间操作臂等领域最为关注的问题,而精确实用的可靠性分析方法是解决此问题的关键。本文在弹性机构动力学有限元分析的基础上,引入构件尺寸和运动副摩擦等随机变量,获得弹性机构随机动态应力的时间历程;将蒙特卡罗法(Monte-Carlo,MC)与人工神经网络结合(artificial neural network,ANN),形成了基于小样本对弹性机构动态强度可靠性进行计算的ANN-MC方法;将该方法用于曲柄滑块机构的动态强度可靠性计算,获得其动态强度可靠性为99.10%。本文方法不仅节省了计算时间,而且提高了动态可靠度求解精度。 相似文献
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This paper presents a finite element-based method for dynamic modeling of parallel robots with flexible links and rigid moving platform. The elastic displacements of flexible links are investigated while considering the coupling effects between links due to the structural flexibility. The kinematic constraint conditions and dynamic constraint conditions for elastic displacements are presented. Considering the effects of distributed mass, lumped mass, shearing deformation, bending deformation, tensile deformation and lateral displacements, the Kineto-Elasto dynamics (KED) theory and Lagrange formula are used to derive the dynamic equations of planar flexible-links parallel robots. The dynamic behavior of the flexible-links planar parallel robot is well illustrated through numerical simulation of a planar 3-RRR parallel robot. Compared with the results of finite element software SAMCEF, the numerical simulation results show good coherence of the proposed method. The flexibility of links is demonstrated to have a significant impact on the position error and orientation error of the flexible-links planar parallel robot. 相似文献
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Jong Hwi Seo Hong Jae Yim Jae Chul Hwang Yong Won Choi Dong Il Kim 《Journal of Mechanical Science and Technology》2008,22(4):722-730
The objective of the present study is to develop a design methodology for the large scale heavy duty robot to meet the design
requirements of vibration and stress levels in structural components resulting from exposure of system modules to LCD (Liquid
Crystal Display) processing environments. Vibrations of the component structures significantly influence the motion accuracy
and fatigue damage. To analyze and design a heavy duty robot for LCD transfer, FE and multi-body dynamic simulation techniques
have been used. The links of a robot are modeled as flexible bodies using modal coordinates. Nonlinear mechanical properties
such as friction, compliance of reducers and bearings were considered in the flexible multi-body dynamics model. Various design
proposals are investigated to improve structural design performances by using the dynamic simulation model. Design sensitivity
analyses with respect to vibration and stresses are carried out to search an optimal design. An example of an 8G (8th-Generation)
LTR (LCD Transfer Robot) is illustrated to demonstrate the proposed methodology. Finally, the results are verified by real
experiments including vibration testing. 相似文献