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Element level damage evaluation using system identification

机译:使用系统识别评估元件级损坏

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Evaluation of the state of damage to existing structures is becoming increasingly important to engineers. Nondestructive damage evaluation (NDE) procedures are being developed. A novel NDE procedure is proposed here to identify defects in existing structures at the element level. It is a time domain system identification technique to estimate the stiffness and damping parameters of structural elements excited by unknown or unmeasured excitation forces. The excitation forces could be of any type, including seismic loading. Rayleigh damping, i.e., the damping is proportional to the mass and stiffness, is assumed in developing the equation of motion. This introduces a source of nonlinearity in the syste midentification algorithm. An efficient solution algorithm is proposed. The procedure is verified with an example. It is shown that the method is accurate, efficient and robust. It can be used to detect defects at the element level of a structure.
机译:对于工程师来说,评估现有结构的损坏状态变得越来越重要。正在开发非破坏性损坏评估(NDE)程序。本文提出了一种新颖的NDE程序,以在元素级别识别现有结构中的缺陷。估计由未知或未测量的激励力激励的结构元件的刚度和阻尼参数是一种时域系统识别技术。激发力可以是任何类型,包括地震载荷。瑞利阻尼,即阻尼与质量和刚度成正比,是在制定运动方程式时假定的。这引入了系统中间化算法中的非线性源。提出了一种有效的求解算法。通过一个示例验证了该过程。结果表明,该方法准确,高效,鲁棒。它可用于检测结构元素级别的缺陷。

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