首页> 外文会议>2002 ASME International Mechanical Engineering Congress and Exposition , Nov 17-22, 2002, New Orleans, Louisiana >A TIME DOMAIN TECHNIQUE FOR DEFECT IDENTIFICATION BASED ON A CONTINUOUS DAMAGE MODEL
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A TIME DOMAIN TECHNIQUE FOR DEFECT IDENTIFICATION BASED ON A CONTINUOUS DAMAGE MODEL

机译:基于连续损伤模型的时域缺陷识别技术

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摘要

A technique for a non-destructive detection, location and severity determination of structural defects by means of a time domain technique is presented. Since damage in a structure causes changes in the physical coefficients of elastic modulus and damping parameters, the response of an undamaged and a damaged structure to the same input excitation is different, and this can be used in a damage identification strategy. The present work uses a continuous damage model to describe the current integrity state of a structure. In order to determine this state of structural damage the minimization of an error function is desired, such a function is basically the difference between the time response of the structural model and the real structure one to the same input excitation. The effectiveness of the proposed technique is assessed on a beam like structure, where displacements, accelerations or strains may considered as being measured at a subset of the system degrees of freedom. In order to furnish realism to performed simulations, the corrupting effects of signal filtering and sampling are considered. The analysis of the results for different levels of signal-to-noise ratio is also carried on.
机译:提出了一种通过时域技术对结构缺陷进行无损检测,定位和严重性确定的技术。由于结构的损坏导致弹性模量和阻尼参数的物理系数发生变化,因此未损坏和损坏的结构对相同输入激励的响应是不同的,因此可以用于损坏识别策略。本工作使用连续损伤模型来描述结构的当前完整性状态。为了确定这种结构损坏的状态,需要最小化误差函数,该函数基本上是结构模型和实际结构对相同输入激励的时间响应之间的差异。拟议技术的有效性是在类似梁的结构上评估的,在该结构中,位移,加速度或应变可以视为是在系统自由度的子集上测量的。为了提供逼真的模拟效果,考虑了信号滤波和采样的破坏效果。还对不同信噪比水平的结果进行了分析。

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