Evaluating response of simple oscillators to a particular kind of time–frequency non-separable evolutionary stochastic processes

Evaluating response of simple oscillators to a particular kind of time–frequency non-separable evolutionary stochastic processes
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评估简单振荡器对特定类型时频不可分离演化随机过程的响应

DOI:
10.1016/j.probengmech.2020.103076
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发表时间:
2020-07
影响因子:
2.6
通讯作者:
Huajun Li
Huajun Li
中科院分区:
工程技术3区
文献类型:
--
作者:
Qian-Ying Cao;Sau-Lon James Hu;Huajun Li

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摘要 本文开发了一种拉普拉斯频率方法,用于推导简单振荡器的响应演化功率谱密度 (EPSD) 的精确闭式解,该简单振荡器受到演化随机过程的影响,该过程以特定类型的时频 ( t , ω ) 不可分离 EPSD 为特征:SF ( t , ω ) = t 2 λ e − 2 γ ( ω ) t Φ ( ω ) 。所提出的拉普拉斯频率方法还为响应 EPSD 提供了深入的物理知识。尽管可以通过对响应 EPSD 对频率进行积分来轻松评估瞬态均方响应,但均方响应的封闭式解并不总是可能的。蒙特卡罗模拟验证了基于数值积分计算的均方响应的正确性。
Abstract This article develops a Laplace-frequency method to derive the exact closed-form solution for the response evolutionary power spectral density (EPSD) of a simple oscillator subjected to an evolutionary stochastic process characterized by a particular kind of time–frequency ( t , ω ) non-separable EPSD: S F ( t , ω ) = t 2 λ e − 2 γ ( ω ) t Φ ( ω ) . The proposed Laplace-frequency method also gains insightful physics for the response EPSD. Although the transient mean square response can be easily evaluated by taking the integral of the response EPSD with respect to the frequency, a closed-form solution for the mean square response is not always possible. The correctness of the computed mean square response based on numerical integration has been verified by Monte Carlo simulations.
DOI: 10.1115/1.3167169
发表时间: 1983-12
期刊: Journal of Applied Mechanics
影响因子: --
作者:
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