基于结构阻尼的机械结合部动力学模型研究

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振动与冲击 ›› 2010, Vol. 29 ›› Issue (8) : 204-208.

论文

基于结构阻尼的机械结合部动力学模型研究

黎定仕;张以都;王鹏

作者信息 +

Dynamic Model of Machine Joints Based on Structural Damping

LI Ding-shi;ZHANG Yi-du;WANG Peng

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文章历史 +

摘要

机械结合部的阻尼由连接界面之间的相对滑动产生，为结构阻尼，因此提出了一种基于结构阻尼的结合部动力学模型。该模型通过刚度和结构阻尼对机械结合部进行等效，模拟结合部的动力学特性。为了对模型进行验证，设计了一组试验进行研究。首先利用DASP系统对试验件进行模态试验，得到模态参数和模态振型，然后根据模态试验数据识别机械结合部动力学参数。基于新模型的有限元复特征值分析结果与模态试验分析结果误差较小，表明结合部动力学模型在设置适宜的参数时，能够模拟机械结合部的动力学特性，验证了模型的可行性。

Abstract

The damping of machine joints, which is a structural damping, results from joint surfaces rubbing with each other. A machine joints model based on structural damping was advanced. The dynamic characteristics of machine joints were simulated by the model with equivalent stiffness and structural damping. Experiments were performed to verify the new model. Modal testing of the specimen was carried out with the help of DASP system. The parameters of the model were identified based on the data from complex eigenvalue analysis and modal testing. The small errors between the results of FEM model with the identified parameters and those of the modal testing show that the machine joints model is capable of describing the dynamic characteristics of machine joints when feasible parameters of the model are set up.

导出引用

黎定仕;张以都;王鹏. 基于结构阻尼的机械结合部动力学模型研究[J]. 振动与冲击, 2010, 29(8): 204-208

LI Ding-shi;ZHANG Yi-du;WANG Peng. Dynamic Model of Machine Joints Based on Structural Damping [J]. Journal of Vibration and Shock, 2010, 29(8): 204-208