摘要
机械波沿波导结构传播过程中,遇到裂缝、支撑等结构不连续会产生反射和透射现象。基于波幅分解法的反射系数预计结果是不连续位置的函数,只有已知不连续位置的情况下可以准确预计反射系数。提出的广义反射系数模型可以在未知不连续位置的条件下测得反射系数。通过拟合采用两种方法获得的反射系数,可以识别出不连续位置。为了验证该不连续位置识别方法的有效性,以梁为例分别对附加质量和裂缝两种不连续进行位置识别。试验结果表明,位置识别误差分别为0%和0.06%。
As waves propagate along the waveguide,wave reflections and transmissions will occur when waves are incident upon discontinuities.Based on wave reflection characteristics,a discontinuity locating method is proposed.In order to obtain the amplitudes of the reflection coefficients,a measurement model and a generalized model of the reflection coefficients are developed.It is possible to identify the position of the discontinuities by matching the reflections of the measurement model and generalized model.The effectiveness of the discontinuity locating method is validated by two experiments to locate an added discontinuity and a crack in the beam,with locating errors of 0% and 0.06%,respectively.
出处
《振动．测试与诊断》
EI
CSCD
北大核心
2014年第5期905-908,979,共4页
Journal of Vibration,Measurement & Diagnosis
基金
国家国际科技合作专项资助项目(2012DFG01790)
