基于双线性频率分离的梁类结构呼吸裂纹定位方法*

doi:10.16731/j.cnki.1671-3133.2024.03.019

现代制造工程 ›› 2024, Vol. 522 ›› Issue (3): 140-147.doi: 10.16731/j.cnki.1671-3133.2024.03.019

• 设备设计/诊断维修/再制造 • 上一篇下一篇

基于双线性频率分离的梁类结构呼吸裂纹定位方法^*

蒋阳, 鲁志文, 冯科伟

武汉科技大学机械自动化学院,武汉 430081

收稿日期:2023-07-24 出版日期:2024-03-18 发布日期:2024-05-31
通讯作者: 鲁志文,博士,副教授,主要研究方向为旋转机械系统动力学及故障诊断、结构健康监测等。E-mail:luzhiwen@wust.edu.cn
作者简介:蒋阳,硕士研究生,主要研究方向为旋转机械系统动力学及故障诊断、结构健康监测等。E-mail:229218139@qq.com;冯科伟,硕士研究生,主要研究方向为旋转机械系统动力学及故障诊断、结构健康监测等。E-mail:fengkewei@wust.edu.cn
基金资助:
* 国家自然科学基金项目(51905388)

Respiratory crack location method for beam structures based on bilinear frequency separation

JIANG Yang, LU Zhiwen, FENG Kewei

College of Mechanical Automation,Wuhan University of Science and Technology,Wuhan 430081,China

Received:2023-07-24 Online:2024-03-18 Published:2024-05-31

摘要/Abstract

摘要： 针对梁类结构早期呼吸裂纹定位问题,基于含呼吸裂纹梁不同测点位置双线性程度的差异,提出了一种双线性频率分离的梁类结构呼吸裂纹定位方法。利用零点搜索、信号分割等技术将不同空间位置的结构响应,分解为双线性效应对应的正响应和负响应分量,分别反映了结构在裂纹张开状态及闭合状态下的动力学行为。不同测点分裂分量频率成分的差异与裂纹位置及深度有关,为此构造了双线性频率成分间的距离损伤指标,实现裂纹的定位。通过对裂纹位置、裂纹深度、激励频率和幅值、固有结构形状及噪声等影响因素的数值研究,表明了方法的有效性,可为实际工程应用提供理论依据。

关键词: 裂纹定位, 双线性特性, 零点搜索, 呼吸裂纹, 信号分割

Abstract: Aiming at the problem of early respiratory crack location of beam structures,based on the difference of bilinear degree of different measuring points of beams with respiratory cracks,a bilinear frequency separation method for respiratory crack location of beam structures was proposed. By using the techniques of zero search and signal segmentation,the structural responses of different spatial positions were decomposed into positive and negative response components corresponding to bilinear effects,which reflect the dynamic behavior of the structure in the crack opening state and closed state,respectively. The difference of frequency components of split components at different measuring points is related to the location and depth of cracks,so the distance damage index of bilinear frequency components was constructed to realize the location of cracks. The numerical study of the influencing factors such as crack location,crack depth,excitation frequency and amplitude,natural structure shape and noise shows the effectiveness of the method and can provide a theoretical basis for practical engineering applications.

Key words: crack location, bilinear characteristics, zero search, respiratory crack, signal segmentation

中图分类号:

TH113

蒋阳, 鲁志文, 冯科伟. 基于双线性频率分离的梁类结构呼吸裂纹定位方法^*[J]. 现代制造工程, 2024, 522(3): 140-147.

JIANG Yang, LU Zhiwen, FENG Kewei. Respiratory crack location method for beam structures based on bilinear frequency separation[J]. Modern Manufacturing Engineering, 2024, 522(3): 140-147.

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基于双线性频率分离的梁类结构呼吸裂纹定位方法^*

Respiratory crack location method for beam structures based on bilinear frequency separation

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