基于应变脉冲响应协方差的损伤识别方法研究
发布时间：2018-09-10 14:34
【摘要】：基于振动参数的结构损伤识别,是近年来土木工程的热点研究课题,振动参数包括频率、振型、频响函数、模态应变能、应变响应和加速度响应等,当结构损伤时,损伤位置附近将产生应力重分布,从而引起应变的变化,因此对比损伤前后的应变或者应变响应参数,可以用来识别结构损伤.提出了一种应变脉冲响应协方差参数,它是应变脉冲响应在时间区间上的能量积分;推导并证明了该参数是结构模态参数(频率,位移模态,应变模态,阻尼等)的函数,可用来表征结构状态.相比于传统的模态参数识别方法,可以保留更高阶的模态参数,而且避免了模态识别可能引起的误差;基于简支钢梁的多种损伤工况,研究和展示了该参数的特性,通过数值模拟发现,该参数能简单直观地判定损伤发生和识别损伤位置,无需建立结构分析模型,只需比较结构损伤前后的应变脉冲响应协方差参数即可;该参数简便易算,具有较好的抗噪性能,对结构损伤敏感,而且对结构刚度减少呈现一致变化特性,所以适合实际工程结构的健康监测和损伤识别.
[Abstract]:Structural damage identification based on vibration parameters is a hot research topic in civil engineering in recent years. Vibration parameters include frequency, mode shape, frequency response function, modal strain energy, strain response and acceleration response. The stress redistribution will occur near the damage location, which will cause strain change. Therefore, comparing the strain or strain response parameters before and after damage, it can be used to identify the structural damage. In this paper, a strain pulse response covariance parameter is proposed, which is the energy integral of the strain pulse response in the time interval, and the parameter is derived and proved to be a function of the structural modal parameters (frequency, displacement mode, strain mode, damping, etc.). It can be used to characterize the structural state. Compared with the traditional modal parameter identification method, the modal parameters of higher order can be retained and the errors caused by modal identification can be avoided. By numerical simulation, it is found that this parameter can be used to determine the damage occurrence and identify the damage location simply and intuitively. It is not necessary to establish a structural analysis model, but only to compare the parameters of the strain pulse response covariance before and after the damage, and the parameters are simple and easy to calculate. It is suitable for the health monitoring and damage identification of practical engineering structures because of its good anti-noise performance, sensitive to structural damage and uniform variation to the reduction of structural stiffness.
【作者单位】： 暨南大学力学与建筑工程学院;
【基金】：国家自然科学青年基金(51208230) 教育部博士点新教师基金(11612438)资助项目
【分类号】：TU317
[Abstract]:Structural damage identification based on vibration parameters is a hot research topic in civil engineering in recent years. Vibration parameters include frequency, mode shape, frequency response function, modal strain energy, strain response and acceleration response. The stress redistribution will occur near the damage location, which will cause strain change. Therefore, comparing the strain or strain response parameters before and after damage, it can be used to identify the structural damage. In this paper, a strain pulse response covariance parameter is proposed, which is the energy integral of the strain pulse response in the time interval, and the parameter is derived and proved to be a function of the structural modal parameters (frequency, displacement mode, strain mode, damping, etc.). It can be used to characterize the structural state. Compared with the traditional modal parameter identification method, the modal parameters of higher order can be retained and the errors caused by modal identification can be avoided. By numerical simulation, it is found that this parameter can be used to determine the damage occurrence and identify the damage location simply and intuitively. It is not necessary to establish a structural analysis model, but only to compare the parameters of the strain pulse response covariance before and after the damage, and the parameters are simple and easy to calculate. It is suitable for the health monitoring and damage identification of practical engineering structures because of its good anti-noise performance, sensitive to structural damage and uniform variation to the reduction of structural stiffness.
【作者单位】： 暨南大学力学与建筑工程学院;
【基金】：国家自然科学青年基金(51208230) 教育部博士点新教师基金(11612438)资助项目
【分类号】：TU317
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