Identification of nonlinear normal modes of engineering structures under broadband forcing

被引：39
|
作者：
Noel, Jean-Philippe [1 ]
Renson, L. [1 ]
Grappasonni, C. [1 ]
Kerschen, G. [1 ]
机构：
[1] Univ Liege, Aerosp & Mech Engn Dept, Space Struct & Syst Lab, 1 Chemin Chevreuils B52-3, B-4000 Liege, Belgium
来源：
MECHANICAL SYSTEMS AND SIGNAL PROCESSING | 2016年 / 74卷
基金：
欧洲研究理事会;
关键词：
Nonlinear normal modes; Experimental data; Broadband excitation; Nonlinear system identification; Numerical continuation; FREQUENCY-DOMAIN METHOD; SYSTEM-IDENTIFICATION; MODAL-ANALYSIS; VIBRATING STRUCTURES; PART I; COMPUTATION; TIME; APPROPRIATION;
D O I：
10.1016/j.ymssp.2015.04.016
中图分类号：
TH [机械、仪表工业];
学科分类号：
0802 ;
摘要：
The objective of the present paper is to develop a two-step methodology integrating system identification and numerical continuation for the experimental extraction of nonlinear normal modes (NNMs) under broadband forcing. The first step processes acquired input and output data to derive an experimental state-space model of the structure. The second step converts this state-space model into a model in modal space from which NNMs are computed using shooting and pseudo-arclength continuation. The method is demonstrated using noisy synthetic data simulated on a cantilever beam with a hardening-softening nonlinearity at its free end. (C) 2015 Elsevier Ltd. All rights reserved.
引用
收藏
页码：95 / 110
页数：16
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