平稳随机载荷的灵敏度分析识别方法

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振动与冲击 ›› 2022, Vol. 41 ›› Issue (23) : 300-306.

论文

平稳随机载荷的灵敏度分析识别方法

夏鹏1,2，杨特1，王乐1,杨智春1

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Identification of stationary random dynamic load based on sensitivity analysis

XIA Peng1,2, YANG Te1, WANG Le1, YANG Zhichun1

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摘要

提出了一种基于灵敏度分析的平稳随机动载荷分段时域识别分析技术。将平稳随机动载荷样本分为若干小段，把每一小段内的平稳随机动载荷表示为正弦级数叠加的形式，通过灵敏度迭代分析来确定相应正弦级数的幅值，从而确定该时间段内结构所受的平稳随机动载荷。最后将各个时间段组合，即得到平稳随机动载荷样本的识别结果。实验结果表明，灵敏度分析识别方法能够很好地识别出作用在结构上的随机动载荷，并具有良好的抗噪性。
关键词：结构动力学；灵敏度分析；载荷识别；随机动载荷

Abstract

We propose a segmented time-domain identification method for stationary random dynamic load by sensitivity analysis. The stationary random load sample is divided into several segments, and the dynamic load in each segment is expressed as the superposition of sine-series. The amplitude of the corresponding sine-series term is determined by the sensitivity iterative analysis, so as to obtain the stationary random dynamic load of each segment. The stationary random dynamic load samples are obtained by combining all the identified dynamic load segments. The experimental results show that the proposed sensitivity analysis identification method can well identify the stationary random load acting on the structure, and has a good anti-noise performance.
Key words: structural dynamic load, sensitivity analysis, load identification, stationary random load

关键词

结构动力学 / 灵敏度分析 / 载荷识别 / 随机动载荷

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夏鹏1,2，杨特1，王乐1,杨智春1. 平稳随机载荷的灵敏度分析识别方法[J]. 振动与冲击, 2022, 41(23): 300-306

XIA Peng1,2, YANG Te1, WANG Le1, YANG Zhichun1. Identification of stationary random dynamic load based on sensitivity analysis[J]. Journal of Vibration and Shock, 2022, 41(23): 300-306

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