Force appropriation of nonlinear structures.

Force appropriation of nonlinear structures.
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DOI:
10.1098/rspa.2017.0880
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发表时间:
2018-06
期刊:
Proceedings. Mathematical, physical, and engineering sciences
影响因子:
--
通讯作者:
Neild SA
Neild SA
中科院分区:
其他
文献类型:
--
作者:
Renson L;Hill TL;Ehrhardt DA;Barton DAW;Neild SA

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非线性简正模态(NNM)被广泛用作建立非线性结构数学模型和理解其动力学的工具。NNM可以通过系统响应和所施加的激励之间的相位正交条件来实验地识别。本文表明,这种常用的正交条件可以得到的结果是显着不同的真实NNM,特别是当施加到系统的激励是有限的一个输入力,在实践中经常使用。所研究的系统是一个固支-固支交叉梁,具有两个密集的模态。本文表明,该地区的正交条件是(中)准确的,可以定性地捕获通过分析系统的模式之间的能量转移,导致讨论的适当数量的输入力和它们的位置在整个结构。
Nonlinear normal modes (NNMs) are widely used as a tool for developing mathematical models of nonlinear structures and understanding their dynamics. NNMs can be identified experimentally through a phase quadrature condition between the system response and the applied excitation. This paper demonstrates that this commonly used quadrature condition can give results that are significantly different from the true NNM, in particular, when the excitation applied to the system is limited to one input force, as is frequently used in practice. The system studied is a clamped–clamped cross-beam with two closely spaced modes. This paper shows that the regions where the quadrature condition is (in)accurate can be qualitatively captured by analysing transfer of energy between the modes of the system, leading to a discussion of the appropriate number of input forces and their locations across the structure.
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发表时间: 2006-04-01
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影响因子: 2.2
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