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The spectral density of the nonlinear damping model: single DOF case

机译:非线性阻尼模型的频谱密度:单自由度情况

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摘要

An analytical method of computing the frequency response of single degree of freedom (DOF) oscillators with nonlinear damping is described. The author proposes an energy-type nonlinear damping model and the corresponding stationary probability density with white noise input can be obtained explicitly. A theorem is presented which gives an interesting result, in terms of the Krylov-Bogoliubov approximation, concerning the modeling and identification of nonlinear internal damping in flexible structures. This analysis also serves as a contribution to random vibration theory by providing a method of computing the first- and second-order statistics (steady-state probability density, correlation function, and spectral density) of nonlinearity damped oscillators with white noise input.
机译:描述了一种计算具有非线性阻尼的单自由度(DOF)振荡器的频率响应的解析方法。作者提出了一种能量类型的非线性阻尼模型,可以明确地获得与白噪声输入对应的平稳概率密度。提出了一个定理,根据Krylov-Bogoliubov逼近,该定理给出了有关柔性结构中非线性内部阻尼的建模和识别的有趣结果。通过提供一种计算带有白噪声输入的非线性阻尼振荡器的一阶和二阶统计量(稳态概率密度,相关函数和频谱密度)的方法,该分析还为随机振动理论做出了贡献。

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