一种改进的矩阵束模态参数估计方法

摘要

Being a commonly used modal parameter estimation algorithm, matrix pencil’ s numerical performance can be easily affected by noise. This paper introduced random decrement technology into matrix pencil algorithm. The results and their analysis showed preliminarily that this method can improve its accuracy and has some advanta-ges compared with other preprocessing method such as band-pass filter.%矩阵束是一种常用的系统模态参数估计方法，在观测信号信噪比较低的情况下较难取得理想的结果。通过引入随机减量技术来改善实测信号的品质，进而得到了一种改进的矩阵束方法，并应用蒙特卡罗方法对信噪比变化、算法参数影响等计算性能进行了统计分析。经与传统方法对比，文中所给出的改进矩阵束方法可以有效地提高模态参数估计的精度。