机械系统静态特性的有限元耦合分析研究

Analysis and Research of Static Deformation of Mechanical Joints

机械系统由多个零部件组成,零件与零件之间是边界非线性的接触问题。在求解了接触问题之后,才能求解机械系统。机床设备对精度的要求非常高,在求解接触问题时必须要考虑零件表面不完整性和工况等综合因素对整机性能的影响。由于接触表面层表现出了与零件本体材料显著不同的力学特性,使得接触问题变得更加复杂。因此,在研究机械系统的性能时,需要将接触问题和接触表面层的非线性特性耦合起来求解。重点研究了耦合求解算法,也就是把结合面的非线性接触刚度作为罚参数引入罚函数有限元算法中来处理接触问题。最后通过实验进行了多次检测,验证了耦合分析结果与实验结果基本一致,验证了机械系统有限元耦合分析算法的有效性。

A machine system is composed of many parts.The no linear boundary contact prob-lems exist in a machine system.After solving those contact problems,the machine system’s character-istics can be obtained.When solving those contact problems,it must consider the influence of the sur-face incomplete character on the global characteris-tic of some machine tools which demand very high precision.The contact problems become much more complicated,because the contact surface layers dis-play a different mechanical behavior from the part body.So it needs to couple the contact problem with the no linear characteristic parameters on＆amp;nbsp;j oint surface when solving the global characteristic of a machine system.This paper focuses on the re-search of coupling algorithm.And the no linear contact stiffness was introduced into the penalty function method as a penalty parameter to solve the contact problem.By lots of experiments,it proved that the result of the coupling analysis pro-gram is approach to the experiment ’s result at last,and it proved that the coupling analysis meth-od is effective.