噪声与振动控制 ›› 2013, Vol. 33 ›› Issue (3): 21-25.DOI: 10.3969/j.issn.1006-1335.2013.03.005

• 2.振动理论与数值解法 • 上一篇    下一篇

最小二乘复频域法实复系数矩阵的分析

许志杰,吴运新   

  1. ( 中南大学  机电工程学院,  长沙  410083 )
  • 收稿日期:2012-07-06 修回日期:2012-11-13 出版日期:2013-06-18 发布日期:2013-06-18
  • 通讯作者: 许志杰

Analysis of Real and Complex Coefficient Matrices Using Least-square Complex Frequency Domain Method

Xu   

  • Received:2012-07-06 Revised:2012-11-13 Online:2013-06-18 Published:2013-06-18
  • Contact: Xu

摘要: 最小二乘复频域法是近年来提出的频域模态识别的方法,该方法在强阻尼、弱阻尼下都具有很好的识别结果。依据最小二乘复频域法的理论与方法,其系数矩阵有两种形式:实系数矩阵形式、复系数矩阵形式。利用Matlab对最小二乘复频域法进行编程,并编制交互式的软件界面。指出最小二乘复频域法在两种系数矩阵下的参数设置,以及系统极点的求解修正公式。通过对铝板的实验分析,表明在两种系数矩阵下分析结果的一致性,并且复系数矩阵具有更好的数值条件,同时验证了程序的正确性。

关键词: 振动与波, 模态识别, 最小二乘复频域法, 系数矩阵, 稳态图, 交互界面

Abstract: Least-squares complex frequency-domain (LSCF) method developed to be implemented in modal parameter estimation recent years. An expect result was received either in the system of weak damping or heavy damping. An User Interface was designed based on Matlab consisting of the LSCF method. Different parameters were set based on different coefficient matrixes and solution modification of the pole of the system was given. A test was used to validate the consistency of the different coefficient matrixes and that the User Interface was correct.

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