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A platform for research: civil engineering, architecture and urbanism
Pile foundation damage position distinguishing method based on wavelet coefficient phase angle changes
The invention relates to a pile foundation damage position distinguishing method based on wavelet coefficient phase angle changes, and belongs to the technical field of structural health monitoring. The damage distinguishing method comprises the steps that reflected wave component signals within the interested frequency band range are extracted from pile foundation reflected wave signals through the analytical mode decomposition theorem; the signals are demodulated through recursive Hilbert transform, and therefore complete separation of an amplitude function and a frequency modulation function is achieved; continuous wavelet transform is conducted on the demodulated pure frequency modulation signals, and a mapping graph of a wavelet coefficient phase angle on the time frequency plane is drawn; and a corresponding phase angle change point is found on the mapping graph, and therefore the damage position of a pile body is determined. According to the pile foundation damage position distinguishing method based on the wavelet coefficient phase angle changes, pile foundation damage suspected points can be effectively judged, and convenience is provided for subsequent damage position checking.
本发明涉及一种基于小波系数相位角变化的桩基损伤位置判别方法，属于结构健康监测技术领域。该损伤识别方法包括：通过解析模态分解定理从桩基反射波信号中提取感兴趣频带范围内的反射波分量信号；采用递归希尔伯特变换对信号进行解调，从而实现了幅值函数和调频函数的完全分离；对解调后的纯调频信号进行连续小波变换，并绘出小波系数相位角在时频面上的映射图；在映射图上找出相应的相位角变化点并由此确定桩身的损伤位置。本发明能够有效判断桩基损伤疑似点，为后续的损伤位置排查提供了便利。
Pile foundation damage position distinguishing method based on wavelet coefficient phase angle changes
The invention relates to a pile foundation damage position distinguishing method based on wavelet coefficient phase angle changes, and belongs to the technical field of structural health monitoring. The damage distinguishing method comprises the steps that reflected wave component signals within the interested frequency band range are extracted from pile foundation reflected wave signals through the analytical mode decomposition theorem; the signals are demodulated through recursive Hilbert transform, and therefore complete separation of an amplitude function and a frequency modulation function is achieved; continuous wavelet transform is conducted on the demodulated pure frequency modulation signals, and a mapping graph of a wavelet coefficient phase angle on the time frequency plane is drawn; and a corresponding phase angle change point is found on the mapping graph, and therefore the damage position of a pile body is determined. According to the pile foundation damage position distinguishing method based on the wavelet coefficient phase angle changes, pile foundation damage suspected points can be effectively judged, and convenience is provided for subsequent damage position checking.
本发明涉及一种基于小波系数相位角变化的桩基损伤位置判别方法，属于结构健康监测技术领域。该损伤识别方法包括：通过解析模态分解定理从桩基反射波信号中提取感兴趣频带范围内的反射波分量信号；采用递归希尔伯特变换对信号进行解调，从而实现了幅值函数和调频函数的完全分离；对解调后的纯调频信号进行连续小波变换，并绘出小波系数相位角在时频面上的映射图；在映射图上找出相应的相位角变化点并由此确定桩身的损伤位置。本发明能够有效判断桩基损伤疑似点，为后续的损伤位置排查提供了便利。
Pile foundation damage position distinguishing method based on wavelet coefficient phase angle changes
基于小波系数相位角变化的桩基损伤位置判别方法
LIU JINGLIANG (author) / LIN CHENGXU (author) / YU XIANYING (author) / WU JINFU (author) / PAN JINGJING (author) / LUO YONGPENG (author) / WANG SIFAN (author) / YU ANHUA (author)
2020-10-27
Patent
Electronic Resource
Chinese
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