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Special phenomena of nonlinear systems in structural dynamics

机译:非线性系统在结构动力学中的特殊现象

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摘要

In modern structural design, more and more nonlinear computation methods are used. In the past, it was possible to consider nonlinearities using analytical solutions only with great effort and only for very few cases. Today, with powerful computers and modern finite element codes, these nonlinear analyses are no longer a problem. For the assessment of the results of such a computation, however, the software user must have a certain mechanical background, in order to understand the behavior of the structure being examined. Especially in structural dynamics, some special phenomena arise with nonlinear systems that are not predicted from linear theory. Some of these phenomena are presented here in relation to a simple example, Duffing's oscillator (a mass-spring system).
机译:在现代结构设计中,越来越多的非线性计算方法被使用。过去,仅在极少数情况下就可以使用解析解决方案来考虑非线性问题。如今,借助功能强大的计算机和现代有限元代码,这些非线性分析已不再是一个问题。但是,为了评估这种计算的结果,软件用户必须具有一定的机械背景,以便了解所检查结构的行为。尤其是在结构动力学中,非线性系统会出现一些无法通过线性理论预测的特殊现象。这些现象中的一些是与一个简单的例子Duffing的振荡器(质量弹簧系统)有关的。

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