摘要
采用LMS Test.Lab对螺栓结合部进行模态实验分析,获得了系统的六阶固有频率和振型,为有限元仿真中模态分析做参照。利用ANSYS Workbench对有限元模型中弹簧的参数进行设置并进行模态分析,计算出六阶振型和固有频率。对比仿真计算的结果和实验测得的结果,识别出螺栓结合部的动刚度。通过对比螺栓预紧力矩为55N·m时识别结果和实验测试的结果(误差在10%以内),证明了该方法的正确性。本识别方法精度高,识别过程简单,为机械结构中螺栓结合部动刚度的求解提供了一种思路。
It introduces the modal analysis test on bolt joints by using LMS Test.Lab, and six natural frequencies and vibration shapes are obtained, which are used as a reference of modal analysis in finite element simulation. The parameters of the springs are set and modal analysis is calculated by using ANSYS Workbench, then six order vibration mode and nature frequencies are calculated. The dynamic stiffness of the bolt joints are identified after comparing the results of the simulation calculations and the experimental results. When the bolts pre-tightening torque is 55N ·m, comparison of the recognition results and the experimental results （error within 10%） proves the correctness of the method. The identification method has high precision and simple identification process, which provides an idea of solving dynamic stiffness for the bolt joints in mechanical structure.
出处
《机械设计与制造》
北大核心
2015年第2期1-3,7,共4页
Machinery Design & Manufacture
基金
清华大学预研项目-MCH63卧式加工中心动态精度辅助设计研究(20080916)
