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Identification of nonlinear normal modes of engineering structures under broadband forcing

机译:宽带强迫下工程结构的非线性法线模式识别

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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.
机译:本文的目的是开发一种将系统识别和数值连续化相结合的两步法,用于在宽带强迫下实验提取非线性法线模(NNM)。第一步处理获取的输入和输出数据,以得出结构的实验状态空间模型。第二步将该状态空间模型转换为模态空间中的模型,使用射击和伪弧长连续性从中计算NNM。该方法使用在悬臂梁上模拟的噪声合成数据进行了演示,该悬臂梁的自由端具有硬化-软化非线性。

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  • 来源
    《Mechanical systems and signal processing》 |2016年第6期|95-110|共16页
  • 作者单位

    Space Structures and Systems Laboratory, Aerospace and Mechanical Engineering Department, University of Liege, 1, Chemin des chevreuils (B52/3), 4000 Liege, Belgium;

    Space Structures and Systems Laboratory, Aerospace and Mechanical Engineering Department, University of Liege, 1, Chemin des chevreuils (B52/3), 4000 Liege, Belgium;

    Space Structures and Systems Laboratory, Aerospace and Mechanical Engineering Department, University of Liege, 1, Chemin des chevreuils (B52/3), 4000 Liege, Belgium;

    Space Structures and Systems Laboratory, Aerospace and Mechanical Engineering Department, University of Liege, 1, Chemin des chevreuils (B52/3), 4000 Liege, Belgium;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Nonlinear normal modes; Experimental data; Broadband excitation; Nonlinear system identification; Numerical continuation;

    机译:非线性法线模式;实验数据;宽带激励;非线性系统识别;数值连续;

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