应变片贴片位置对轮轨横向水平力测试精度的影响

摘要

采用应变片测试技术中的剪力法进行轮轨横向水平力测试.结合加载条件等因素,通过试验研究应变片的粘贴位置对测试精度的影响,为提高横向水平力测试精度提供依据.经过理论分析,并进行现场实测,通过改变应变片在钢轨轨底上缘的贴片位置,建立轮轨横向水平力测试精度的评价方式,探索非横向水平力因素对测试的影响规律.最终根据实测数据分析得出:在运用应变片测试技术中的剪力法测试钢轨横向水平力时,最佳贴片位置为距离轨底边缘1.5～2.5 cm处.%Strain gauge testing is widely applied in railway scene to measure the wheel and railway horizontal force. By taking the load condition into consideration, the influence of different sites of strain gauge on the testing precision is introduced, the figures from practical test are analyzed to seek the best site and provide a basis for improving the testing precision. In experiential tests, by changing the sites of strain gauge on top of the rail base, an evaluation system of testing precision is established and the regulation of influences is obtained. Based on the above analysis, a conclusion is draw that the best site of strain gauge is from 1.5 to 2. 5 cm between the bottom and the top of the rail track.