摘要
通过钢梁损伤试验,验证基于小波包能量谱的结构损伤预警方法在实际结构上应用的有效性。对钢梁进行完好工况和三个损伤工况的动力响应测试,对得到的响应进行小波包分解,考察损伤前后各个特征频带的能量变化。试验结果显示,损伤预警指标ERV和ERVD能够对三种损伤工况做出有效预警;同一工况的多次测试得到的损伤预警指标ERVD虽有变化但变化不大。基于小波包能量谱的结构损伤预警指标对结构损伤具有敏感性、对测试噪声具有鲁棒性,可以用于实际结构损伤预警。
Through a steel beam damage experiment, the validity of structural damage alarming method based wavelet packet energy spectrum was proved. This experiment had four cases, one was an initial case and others were three damage cases. Dynamic responses of a steel beam were measured and decomposed using wavelet packet and energy changes of characteristic frequency bands were investigated. Experimental results revealed that three damage cases could be alarmed by the damage alarming indices ERV and ERVD and that ERVD varied slightly with different measurements of the same damage case. The structural damage alarming indices based on wavelet packet energy spectrum were sensitive to damage and robust to noise and they could be used in actual structures.
出处
《振动与冲击》
EI
CSCD
北大核心
2009年第4期4-9,共6页
Journal of Vibration and Shock
基金
国家杰出青年科学基金项目(50725828)
国家863计划资助项目(2006AA04Z416)
国家自然科学基金重点项目(50538020)
东南大学科技基金资助项目(XJ2008310)
东南大学优秀博士学位论文基金资助项目(0705)
关键词
小波包能量谱
结构损伤预警
损伤敏感性
噪声鲁棒性
wavelet packet energy spectrum
structural damage alarming
sensitive to damages
robust to noise
