报告题目：Wheel-rail impact at an insulated rail joint: impact vibration, noise and transient contact solutions                  

主讲人：杨震

讲座时间：2017年4月26日（星期三）16：00

讲座地点：九里校区逸夫馆X4223

主讲人简介：

杨震，内蒙古呼和浩特人。本科（2005-2009）毕业于北京理工大学交通工程专业，硕士（2009-2012）毕业于同济大学轨道工程专业。从2012年9月起至今，在荷兰代尔夫特理工大学结构工程系攻读博士学位，主要研究方向为轮轨动态接触以及动力学仿真。

讲座内容简介：

Due to the significant discontinuities in stiffness and geometry, the insulated rail joint (IRJ) is considered as one of the weakest parts of railway track structures.When a train runs over an IRJ, a wheel-rail impact occurs. This may consequently lead to impact vibration and noise andaccelerate track deterioration. This presentation proposesan explicit finite element wheel-IRJ dynamic interaction modelto study wheel-rail impacts at a typical IRJ in the Dutch railway network. The dynamic behaviour of the IRJ sub-model and theimpact vibration and noise simulated by the wheel-IRJ interaction model are validated against a comprehensive hammer test and a pass-by measurement, respectively.The study connects the dominant frequencies of the wheel-IRJ impact vibration and noise with the dynamic behaviour of the target IRJ, which may further contribute to the mitigation of impact vibration and noise at IRJs as well as to train-borne detection of deterioration types of IRJs. Transient impact contact solutions calculated by the proposed wheel-IRJ dynamic interaction model, including evolutions of the contact patch area, stress magnitude and direction within contact patch, micro-slip distributions, and railhead nodal vibration velocities in the vicinity of the joint during the wheel-IRJ impact,are also presented.

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