Affiliation of Author(s):航空学院

Journal:Zhendong Gongcheng Xuebao

Abstract:In the modal analysis of a structure excited by both the artificial force and the ambient noise, the precision of modal parameter estimation can be improved by making full use of the noise responses.In this paper, a method of modal parameter identification with consideration of noise excitation based on the non-parametric noise model is presented. Applying Hilbert transformation to the power spectrum density(PSD) of the noise response can yield a new function named analogous frequency response function (AFRF), which can be combined with the frequency response function obtained through artificial excitation to identify modal parameters through the ploy-reference least-squares complex frequency-domain (poly-LSCF) algorithm.The presented method is validated by a simulation example of an aircraft wing model and a practical modal test for a plane model. Compared with the traditional methods based on the experimental modal analysis without consideration of ambient excitation, the new method is simpler, more effective and of higher precision in the identification of modal parameters. © 2018, Nanjing Univ. of Aeronautics an Astronautics. All right reserved.

ISSN No.:1004-4523

Translation or Not:no

Date of Publication:2018-06-01

Co-author:Xia, Zun-Ping

Correspondence Author:王彤