• CN:11-2187/TH
  • ISSN:0577-6686

›› 2014, Vol. 50 ›› Issue (8): 1-9.

• 论文 •    下一篇



  1. 上海交通大学机械系统与振动国家重点实验室;上海电气电站设备有限公司
  • 出版日期:2014-04-20 发布日期:2014-04-20

Dynamic Stiffness Measurement and Dynamic Behaviors Prediction of Bearing Support in Heavy Dynamic Balancing Machine

ZHOU Shengtong; LI Hongguang; LIU Yan; JING Bo   

  1. State Key Laboratory of Mechanical System and Vibration, Shanghai Jiao Tong University;Shanghai Electric Power Generation Equipment Co., Ltd.
  • Online:2014-04-20 Published:2014-04-20

摘要: 重型动平衡机摆架的动力学性能直接影响动平衡试验的安全和精度。从探讨动平衡机摆架动力性能出发,依据摆架特殊结构形式和试验目的,设计基于锤击法的动刚度试验并测得八条动刚度数据。依据这些试验动刚度数据,从动平衡机摆架的结构形式、服役状况和工作环境等方面剖析摆架的动刚度情况,发现其动力性能在工作范围内并没有明显的退化现象。根据有限的试验动刚度数据得到摆架的多个共振频率。之后,通过简单的模型更新技术并依据试验共振频率构建用于辅助预计摆架共振振型的有限元模型。从摆架有限元模态信息、动刚度信息和静态变形信息以及试验动刚度数据角度预计摆架共振振型,并对其方法的合理性给予论述。

关键词: 摆架;动刚度;锤击法;有限元模型;模型更新

Abstract: The dynamic performance of bearing support in heavy dynamic balancing machine is directly related to the safety and accuracy of balancing test. For investigating the dynamic behaviors of bearing support, an impact excitation dynamic stiffness test is first planed according to the special structure style of the bearing support with the testing objectives in mind, and eight dynamic stiffness curves are also measured. In the basis of these data, the actual dynamic stiffness states of bearing support are analyzed from the aspects of its configure style, service time and working condition, and find that there are no obvious performance degradation for bearing support in its working frequency range. After this, several resonance frequencies of bearing support are further identified though finding valleys of the limited dynamic stiffness curves. A model updated finite element model is established from these resonance frequencies for assisting to predict the resonance shapes of bearing support. The resonance shapes are reasonably figured out from the modal, dynamic stiffness and static deformation information calculated from the finite element model together with the experimental dynamic stiffness data, and the rationality of the way of dynamic behaviors prediction is also discussed.

Key words: bearing support;dynamic stiffness;impact excitation test;finite element model;model updating technology