摘要
为了准确、快速检测出钢轨中的损伤及其损伤位置和程度,提出了基于应变模态变化率的钢轨损伤检测方法。以五跨钢轨为例,通过数值仿真分析和实验室足尺模型测试表明:基于频率的变化可判断钢轨发生损伤,但无法确定损伤的位置及程度;基于应变模态的变化和基于应变模态变化率的变化可判断钢轨发生损伤、确定损伤的位置和程度;损伤程度对于损伤识别的影响较大,损伤程度越大,损伤单元的应变模态变化率就越大,钢轨的前两阶应变模态变化率可以确定损伤的发生、位置及损伤程度。
In order to quickly and accurately detect the rail damage and the position and extent of damage, a new rail damage detection method which is based on the rate of change of strain mode is put forward. Taking five cross rail as an example, through the numerical simulation analysis and laboratory model test, the results show that: Based on the frequency change, it can determine the rail damage occurs, but is unable to determine the location and extent of damage; based on strain modal changes,it can determine the rail damage, the location and extent of injury; based on strain modal changes in the rate of change, it can determine the rail damage, the location and extent of injury; injury severity influences damage identification greatly.Injury severity is greater, the rate of change of strain mode of the injuried element is bigger. The two order strain mode change rate of the rail can determine injury occurrence, damage location and damage degree.
出处
《振动．测试与诊断》
EI
CSCD
北大核心
2012年第5期723-729,859,共7页
Journal of Vibration,Measurement & Diagnosis
基金
国家自然科学基金资助项目(编号:51078320)
铁道部重大科研资助项目(编号:2011G009)
关键词
钢轨损伤
应变模态变化率
损伤位置
损伤程度
rail damage,rate of change of strain mode,damage location,damage degree
