基于遗传算法优化变分模态分解方法联合冲击谱的冲击载荷重构方法研究
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1.中广核研究院有限公司 系统工程与改造中心;2.大连理工大学 工业装备结构分析优化与CAE软件全国重点实验室

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基金项目:

基于相位共轭方法的多目标噪声源在复杂声场中分离和识别研究


Research on reconstruction method of impact load based on genetic algorithm optimized variational modal decomposition method and impact spectrum
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Affiliation:

1.System Engineering and Transformation Center t, China Nuclear Power Technology Research Institute, Shenzhen;2.State Key Laboratory of Structural Analysis, Optimization and CAE Software for Industrial Equipment, Dalian University of Technology, Dalian 116024, Liaoning, P.R.China

Fund Project:

Study on Separation and Identification of Multitarget Noise Sources in Complex Sound Field Based on Phase Conjugation Method

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    摘要:

    【目的】海上浮式装置在受到其他船舶碰撞时,将形成复杂的冲击环境,鉴于海上浮式装置的力学分析严苛性,如不对碰撞所形成的冲击载荷进行分析、优化,过高的分析频率将对后续的工作带来极大的困难。【方法】采用提出基于遗传算法优化变分模态分解(Variational Modal Decomposition, VMD方法)联合冲击谱(Shock Response Spectrum,SRS)的冲击载荷重构方法。首先针对具体冲击响应信号,利用遗传算法优化 VMD 参数,冲击载荷进行分解,随后通过与原始载荷冲击谱对比,确定截止频率,最后基于载荷截止频率,对冲击载荷进行重构。【结果和结论】通过结构动力学响应计算验证,基于遗传算法优化变分模态分解方法联合冲击谱的冲击载荷重构方法,可以在进行结构动力响应前可靠地对冲击载荷进行重构。

    Abstract:

    When the floating device at sea collides with other ships, it will form a complex impact environment. Given the strict mechanical analysis of the floating device at sea, if the impact load formed by the collision is not analyzed and optimized, the high analysis frequency will bring great difficulties to the subsequent work. In this paper, a Shock load reconstruction method based on a genetic algorithm-optimized Variational Modal Decomposition (VMD) and Shock Response Spectrum (SRS) is proposed. Firstly, aiming at the specific impact response signal, the genetic algorithm is used to optimize the VMD parameters, and the impact load is decomposed. Then the cut-off frequency is determined by comparing it with the original load impact spectrum. Through the calculation of structural dynamic response, the impact load reconstruction method based on genetic algorithm optimized VMD method and impact spectrum can reliably reconstruct the impact load before the structural dynamic response.

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  • 收稿日期:2023-03-17
  • 最后修改日期:2023-04-18
  • 录用日期:2023-04-19
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