基于Wigner-Ville分布交叉项的独塔自锚式悬索桥损伤识别试验研究

发布时间：2017-12-26 18:14

本文关键词：基于Wigner-Ville分布交叉项的独塔自锚式悬索桥损伤识别试验研究　出处：《振动与冲击》2016年06期 　论文类型：期刊论文

【摘要】：为研究以Wigner-Ville分布的交叉项作为指标进行损伤识别效果,探究完整的提取交叉项方法,通过对二重余弦信号的Wigner-Ville分布推导,获得主项与交叉项的位置关系及交叉项震荡特性;据此设计相应的提取方法,将Wigner-Ville分布中各频率段正负能量分别沿时间轴积分,将正负能量之和绝对值作商,通过设定阈值进行筛选获得交叉项能量分布;以工程实例为研究对象,通过对比无、有损状态下对应测点交叉项能量差的突异点识别损伤位置与程度。试验结果表明,交叉项可作为损伤识别指标,且效果显著。
[Abstract]:As the research in the cross Wigner-Ville distribution as an index for the damage identification results, to explore the complete extraction of cross term method, Wigner-Ville distribution through the derivation of the double cosine signal, obtaining the main terms and cross terms of position relationship and cross shock characteristics; method of extracting the corresponding design accordingly, integral to each frequency distribution of Wigner-Ville in positive and negative energy respectively along the time axis, the positive and the negative energy and absolute values for business, to obtain the cross energy distribution of screening by setting the threshold; according to the practical engineering as the research object, by contrast, no damage under the condition of corresponding measuring point cross energy difference of the process to identify the damage location and degree of difference. The test results show that the cross term can be used as the damage identification index, and the effect is significant.
【作者单位】：北京工业大学工程抗震与结构诊治北京市重点实验室;
【基金】：国家自然科学基金资助项目(51378037);国家自然科学基金资助项目(51378039)
【分类号】：U446
【正文快照】： 健康监测重点即识别结构损伤,而因损伤不断累积会导致结构体系发生灾难性破坏造成严重的财产损失及安全隐患。因此对结构损伤定位、评估损伤程度已成为研究新课题。损伤部位的振动信号往往会发生突异,有效分析找到信号的突异点与程度是结构损伤识别的关键[1-3]。时频分析的主

【相似文献】