摘要
频散曲线和波结构是钢轨导波检测时设计检测方法和分析回波波形的基础。首先介绍了半解析有限元计算任意截面弹性波导中导波传播的频散曲线和波结构的基本方法。然后应用该方法求解了U60型钢轨中垂直振动模态的导波频散曲线和波结构,并讨论了频散曲线和波结构在钢轨轨头缺陷导波检测中的应用。最后采用模态力锤实验及时频联合分析的方法验证了频散曲线数值计算结果。钢轨轨头横向裂纹垂直振动模态导波检测的有限元数值模拟和实验表明该模式导波是检测钢轨轨头缺陷的有效检测模式波型。
While rails being inspected by guided waves techniques, dispersion curves and wave structures act as the basis for designing tools and analyzing waveforms. This paper, first, introduces a basic way for calculating dispersion curves and wave structures for guided waves propagation in elastic waveguides of arbitrary cross--section with a semi-analytical finite element method （SAFEM）. Then the guided waves dispersion curves and wave structures of vertically vibrating modes in U60 rail are obtained by using semi-analytical finite element method and their applications in guided wave inspection for railhead defect are discussed. Finally, instrumented hammer experimental work and jointed time-frequency analysis are carried out to verify the dispersion curves＇ numerical results. Finite element method （FEM） modeling and experimental investigations of railhead transverse defect detection shows that the guided waves in rail＇s vertically vibrating mode are quite fit for inspecting defects in railhead.
出处
《振动工程学报》
EI
CSCD
北大核心
2014年第4期598-604,共7页
Journal of Vibration Engineering
基金
国家自然科学基金资助项目(10964008
51265044)
江西省自然科学基金资助项目(20114BAB202008)
