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Nonlinear Normal Modes of Nonconservative Systems

机译:非线性常规非直线正常模式

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Linear modal analysis is a mature tool enjoying various applications ranging from bridges to satellites. Nevertheless, modal analysis fails in the presence of nonlinear dynamical phenomena and the development of a practical nonlinear analog of modal analysis is a current research topic. Recently, numerical techniques (e.g., harmonic balance, continuation of periodic solutions) were developed for the computation of nonlinear normal modes (NNMs). Because these methods are limited to conservative systems, the present study targets the computation of NNMs for nonconservative systems. Their definition as invariant manifolds in phase space is considered. Specifically, a new finite element technique is proposed to solve the set of partial differential equations governing the manifold geometry.
机译:线性模态分析是一种成熟的工具,享受各种应用范围从桥梁到卫星的应用。然而,模态分析在非线性动力学现象存在下失败,并且模态分析的实际非线性模拟的发展是当前的研究主题。最近,开发了用于计算非线性正常模式(NNMS)的数值技术(例如,谐波平衡,连续解决方案的延续)。因为这些方法仅限于保守系统,所以本研究靶向NNMS用于非可供性系统。考虑将其定义作为相位空间中的不变歧管。具体地,提出了一种新的有限元技术来解决控制歧管几何形状的局部微分方程集。

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