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Elements of Nonlinear System Identification of Broad Applicability

机译:广泛应用的非线性系统辨识要素

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摘要

Linear modal analysis in the time and frequency domains is well established. Yet, as mechanical systems become increasingly more complex, incorporating electromechanical components or biological and biomimetic elements, the likelihood exists that their dynamics will be strongly nonlinear and nonstationary. Examples of sources of strong nonlinearity, some of which are realized even for small amplitudes of vibration) include local buckling, plastic deformations, clearance and backlash, hysteresis, friction-induced oscillations, and vibro-impact motions. Such effects cannot be accurately addressed by linear modal analysis, since standard techniques, such as the classical FT, and well-established concepts such as normal mode, natural frequency, and modal space cannot be applied to the identification of nonlinear and nonstationary dynamic regimes.
机译:在时域和频域中的线性模态分析已得到很好的建立。然而,随着机械系统变得越来越复杂,并结合了机电组件或生物和仿生元素,它们的动力学可能会呈现出强烈的非线性和非平稳性。强非线性源的示例包括局部屈曲,塑性变形,游隙和游隙,磁滞,摩擦引起的振荡以及振动冲击运动,其中一些甚至在很小的振动幅度下也可以实现。由于标准技术(例如经典FT)和行之有效的概念(例如正常模式,固有频率和模式空间)无法应用于非线性和非平稳动态范围的识别,因此无法通过线性模态分析来准确解决此类影响。

著录项

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  • 作者

    A.F. Vakakis;

  • 作者单位

    Depatment of Mechanical Science and Engineering University of Illinois at Urbana-Champaign Urbana, USA;

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  • 原文格式 PDF
  • 正文语种 eng
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