On the Source of the Systematic Error of the Pressure Measurement Film Applied to Wheel–Rail Normal Contact Measurements
On the Source of the Systematic Error of the Pressure Measurement Film Applied to Wheel–Rail Normal Contact Measurements
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DOI：
10.1115/1.4037358
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发表时间：
2018-03
影响因子：
2.5
通讯作者：
Jagoba Lekue;F. Dörner;C. Schindler
中科院分区：
文献类型：
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作者：
Jagoba Lekue;F. Dörner;C. Schindler
本文介绍了测量轮轨接触面积时压力测量膜系统误差的研究工作。特别是，对不同胶片类型所显示的不同误差值进行了解释。建立了一个有限元模型，假设不仅薄膜，而且它上面的微胶囊也会改变结果。通过定义具有元件失效和缺失行为的微胶囊，提高了现有薄膜模型的性能。新模型能够再现实验中系统误差所表现出的趋势。模拟结果证实，某一薄膜类型的测量误差不仅与薄膜本身有关，还与失效压力，尤其是胶囊的直径有关。
This paper presents research activities regarding the systematic error of the pressure measurement film when measuring the area of the wheel–rail contact. In particular, an explanation for the different error values shown by the different film types was sought. A finite element model was created based on the assumption that not only the film, but also the microcapsules on top of it alter the results. The performance of the existing film models was enhanced by defining microcapsules with element failure and deletion behaviors. The new model was capable of reproducing the trend shown by the systematic error in the experiments. The simulation results confirmed that the measurement error of a certain film type is not only caused by the film itself, but also depends on the failure pressure and especially the diameter of the capsules.