Dynamics of Multibody Systems With Spherical Clearance Joints
Dynamics of Multibody Systems With Spherical Clearance Joints
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DOI：
10.1115/detc2005-84392
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
P. Flores;J. Ambrósio;J. Claro;H. Lankarani
中科院分区：
文献类型：
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作者：
P. Flores;J. Ambrósio;J. Claro;H. Lankarani
研究了空间多体系统中球间隙副的影响。该方法是基于笛卡尔坐标系，作为动态的关节元件建模为碰撞体和接触力控制。的影响和接触所描述的一个连续的接触力模型，占接触表面的几何和机械特性。的接触力的影响机构之间的弹性伪渗透的功能，再加上一个非线性的粘弹性因素，代表在冲击过程中的能量耗散进行评估。一个空间四杆机构作为一个说明性的例子，并提出了一些数值结果，被开发的方法在其演示过程中讨论的效率。研究结果表明，在空间多体系统建模中引入间隙节点对部件位置的预测有显著影响，并使节点处的加速度峰值和反作用力矩峰值显著增加。此外，当模拟中包括间隙连接时，系统的响应明显倾向于非周期性。
This work deals with a methodology to assess the influence of the spherical clearance joints in spatial multibody systems. The methodology is based on the Cartesian coordinates, being the dynamics of the joint elements modeled as impacting bodies and controlled by contact forces. The impacts and contacts are described by a continuous contact force model that accounts for geometric and mechanical characteristics of the contacting surfaces. The contact force is evaluated as function of the elastic pseudo-penetration between the impacting bodies, coupled with a nonlinear viscous-elastic factor representing the energy dissipation during the impact process. A spatial four bar mechanism is used as an illustrative example and some numerical results are presented, being the efficiency of the developed methodology discussed in the process of their presentation. The results obtained show that the inclusion of clearance joints in the modelization of spatial multibody systems significantly influences the prediction of components’ position and drastically increases the peaks in acceleration and reaction moments at the joints. Moreover, the system’s response clearly tends to be nonperiodic when a clearance joint is included in the simulation.Copyright © 2005 by ASME