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Investigation on Selection of Optimal Mother Wavelet in Mode Shape based Damage Detection Exercise

机译：基于模式形状的损伤检测锻炼中最优母体小波选择的研究

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The materials of the structures in use are always subjected to degradation in its characteristics over the period of time. The reduction in stiffness is always associated with such degradation. The analysis of vibration response of such materials with appropriate signal processing techniques has always led to the solution of damage identification exercises. The aim of the paper is to evaluate the performance of mode shape based technique along with wavelet transform through simulated model of structure- a cantilever, in damage identification exercise. A small transverse cut of wire thickness is introduced in cantilever beam. Depth of wire cut is varied to intensify the damage at various locations. Number of flexural modes are extracted from finite element modal analysis. Spatial continuous wavelet analysis is carried on number of modes. Effectiveness of different biorthogonal and reverse biorthogonal mother wavelets is studied to investigate the efficacy of the method. The proper selection of analysing mother wavelet influences the desired information extraction and its amplification process. The most suitable mother wavelet is recommended considering the nature of variation of wavelet coefficients.
机译：在使用中的结构中的材料总是在一段时间内进行其特征的降解。刚度的降低总是与这种降解相关的。具有适当信号处理技术的这种材料的振动响应分析始终导致损坏识别锻炼的解决方案。本文的目的是通过模拟结构模型 - 悬臂进行损伤识别运动，评估基于模式的技术基于技术的技术以及小波变换的性能。在悬臂梁中引入了线厚的小横切切割。电线切割深度变化，以强化各个位置的损坏。从有限元模态分析中提取弯曲模式的数量。空间连续小波分析载于模式数。研究了不同双正交和反向双正交母小波的有效性，研究了方法的功效。正确选择分析母小波对所需的信息提取及其放大过程影响。考虑到小波系数的变化性质，建议最合适的母亲小波。

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