1.轨道交通钢轨无损探伤技术的发展及展望
主讲人：章罕 总经理
邀请人：杨新文 教授
时间：2019年09月19日（周四）9:00—11:00
地点：通达馆103
主讲人简介：
章罕教授，本科毕业于同济大学应用物理专业，硕士毕业于中国科学院声学研究所，博士毕业于Iowa State University，近几年来主要从事轨道结构超声波无损检测研究。他是科技部创新型领军人才，国侨办“重点华人华侨创业团队”领军人才，曾获上海铁路局科学技术“一等奖” 1项 ，侨联“创新创业”杰出人才贡献奖1项，爱荷华州立大学优秀论文奖1项；他是美国声学协会会员，美国无损检测协会会员，合肥“228”产业创新团队带头人，安徽省“115”产业创新团队带头人。
主讲内容简介：
轨道交通钢轨探伤是铁路工务运营维护中的一个关键环节，是钢轨防断的一个核心技术。特别是随着铁路的提速和轴重的增加，钢轨承受更大的载荷，给钢轨探伤带来更大的挑战。本报告将讲述钢轨无损探伤的原理，国内外钢轨探伤设备的发展以及钢轨探伤的管理规范。特别是针对国内铁路运输繁忙，列车运营间隔短，铁路安全性要求高等研发的新型钢轨无损探伤技术与设备。针对国内高速发展的城市轨道交通，在钢轨探伤的基础上，利用人工智能、机器视觉等技术进一步发展综合运维设备，提高轨道交通运维的效率及可靠性。
2.Modelling of the sound radiation from the railway track
主讲人：Dr. Xianying Zhang
邀请人：杨新文 教授
时间：2019年09月19日（周四）9:00—11:00
地点：通达馆103
主讲人简介：
Dr Xianying Zhang is a research fellow in the Institute of Sound and Vibration Research (ISVR) at the University of Southampton, UK, where she received her PhD degree in 2016. She has a variety of research interests in the structural vibration and sound radiation from aircraft, submarine and railway tracks including the passive and active control of noise from these structural vibrations. Her current research is on the dynamic properties of railway tracks and seeking mitigation measures to reduce the railway noise. She is the reviewers for the Journal of Sound and Vibration, Applied Acoustics, Acta Mechanica and Japan Society of Applied Physics.
主讲内容简介：
The most important source of railway noise in most situations is rolling noise. In order to implement strategies of noise control in the system, it is necessary to understand the mechanisms of sound generation. A new engineering model has been proposed to predict the sound radiation from the rails and sleepers. In particular, the updated model for the rail radiation is based on a weighted average of the results obtained by using 2D boundary element method (BEM) models, allowing for the fact that the rail is either attached to a rigid ground (concrete sleeper) or located above an absorptive ground (ballast bed). For the improved sleeper radiation model, results from a 3D BEM model are used including three sleepers and an absorptive ballast surface. Besides, the ballast absorption and ballast vibration are studied; their influence on the sound power radiated from the track is evaluated. The new models for the rail and sleeper radiation have been combined with the TWINS model to predict the sound radiation from operational tracks and comparisons have been made with field measurements.
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