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Statistical high-order moment-based structural damage identification method and device under wave excitation
The invention discloses a statistical high-order moment-based structural damage identification method and device under wave excitation. The method comprises the following steps: obtaining structural dynamic response signals (displacement, speed or acceleration) under wave excitation in a structural intact state and a current state; based on an empirical mode decomposition method and a structural resonance theoretical solution, extracting an effective component of the dynamic response signal by adopting a primary function statistical similarity method; calculating high-order moment statistics of effective components of the dynamic response signals in the intact state and the current state; normalizing the high-order moment statistics, and removing the influence of the excitation size; and judging whether a certain point of the structure is damaged or not according to the difference between the high-order moment statistics of the intact state and the current state. The method can effectively solve the problems of effective component identification and extraction of complex structure response signals under wave excitation, and structural local damage identification.
本发明公开了一种基于统计高阶矩的波浪激励下结构损伤识别方法及装置，包括：获取结构完好状态和当前状态的波浪激励下结构动力响应信号（位移、速度或加速度）；基于经验模态分解方法以及结构共振理论解，采用基函数统计相似度方法提取动力响应信号有效分量；计算完好状态和当前状态下动力响应信号有效分量的高阶矩统计量；对高阶矩统计量进行正规化，去除激励大小的影响；用完好状态和当前状态的高阶矩统计量差异大小判断结构某点是否存在损伤。本发明能够有效解决波浪激励下复杂结构响应信号有效分量识别与提取，以及结构局部损伤识别问题。
Statistical high-order moment-based structural damage identification method and device under wave excitation
The invention discloses a statistical high-order moment-based structural damage identification method and device under wave excitation. The method comprises the following steps: obtaining structural dynamic response signals (displacement, speed or acceleration) under wave excitation in a structural intact state and a current state; based on an empirical mode decomposition method and a structural resonance theoretical solution, extracting an effective component of the dynamic response signal by adopting a primary function statistical similarity method; calculating high-order moment statistics of effective components of the dynamic response signals in the intact state and the current state; normalizing the high-order moment statistics, and removing the influence of the excitation size; and judging whether a certain point of the structure is damaged or not according to the difference between the high-order moment statistics of the intact state and the current state. The method can effectively solve the problems of effective component identification and extraction of complex structure response signals under wave excitation, and structural local damage identification.
本发明公开了一种基于统计高阶矩的波浪激励下结构损伤识别方法及装置，包括：获取结构完好状态和当前状态的波浪激励下结构动力响应信号（位移、速度或加速度）；基于经验模态分解方法以及结构共振理论解，采用基函数统计相似度方法提取动力响应信号有效分量；计算完好状态和当前状态下动力响应信号有效分量的高阶矩统计量；对高阶矩统计量进行正规化，去除激励大小的影响；用完好状态和当前状态的高阶矩统计量差异大小判断结构某点是否存在损伤。本发明能够有效解决波浪激励下复杂结构响应信号有效分量识别与提取，以及结构局部损伤识别问题。
Statistical high-order moment-based structural damage identification method and device under wave excitation
基于统计高阶矩的波浪激励下结构损伤识别方法及装置
WANG QIMING (author) / ZHU RUIHU (author) / ZHENG JINHAI (author)
2022-11-01
Patent
Electronic Resource
Chinese
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