›› 2010, Vol. 30 ›› Issue (5): 1-8.

• 研究探讨 •    下一篇

基于频响函数模型修正影响因素的仿真

 丁继锋, 韩增尧, 庞世伟   

  1. 中国空间技术研究院
  • 收稿日期:2009-09-15 修回日期:2010-03-19 出版日期:2010-10-25 发布日期:2010-10-25
  • 作者简介:丁继锋 1980年生,2006年获西北工业大学飞行器设计专业硕士学位,现为中国空间技术研究院总体部博士研究生,主要研究方向为结构动力学建模及模型修正技术。

Critical Factors in Frequency Response Function Based Model Updating Using a Simulated Example

 Ding  Jifeng, Han  Zengyao, Pang  Shiwei   

  1. China Academy of Space Technology
  • Received:2009-09-15 Revised:2010-03-19 Online:2010-10-25 Published:2010-10-25

摘要:     首先推导了基于频响函数模型修正的理论公式,在此基础上通过平面桁架模型修正的仿真算例,比较研究了基于频响函数模型修正方法具体实现过程中数据测量噪声、频率点选择以及频段选择等因素对修正结果的影响。研究表明,频率点的选择是基于频响函数模型修正的关键因素,合理的频率点选择既能够减小计算量,降低修正方程的条件数,同时还能够抑制测量噪声的影响;此外,提高实测数据的精度,增加修正频段的宽度也是改善模型修正效果的有效手段。

关键词: 频率响应函数, 模型修正, 频率点选择, 测量噪声, 修正频段

Abstract:     The basic theory of the frequency response function (FRF) based updating method was presented, and then the influences of the measured noise, the selection of frequency point and frequency band on the updating result were studied by using a simulated truss structure model. The conclusions show that:First, frequency selection is a key to the success of the updating, and appropriate selection of frequency point can decrease computational costs, improve the condition of the sensitivity matrix and resist the effect of measured noise; secondly, improving the accuracy of the measured data and increasing frequency band used in the updating are effective ways to get better updated model.

Key words: Frequency response function, Model updating, Frequency point selection, Measured noise, Revision frequency band