主讲人：David Thompson 教授
邀请人：杨新文 教授
时间：2019年6月18日（周二）13:30-15:00
地点：学院楼327会议室
主讲人简介
David Thompson has a degree in Mathematics from the University of Cambridge and a PhD from the Institute of Sound and Vibration Research (ISVR), University of Southampton, UK. He worked at British Rail Research in Derby, UK and TNO in the Netherlands before joining ISVR in 1996 where he is now Professor of Railway Noise and Vibration and head of the Dynamics Research Group. His research covers all aspects of railway noise and vibration. He is the main author of the TWINS program for rolling noise. He has written over 170 journal papers and over 250 conference papers; his book on Railway Noise and Vibration was published by Elsevier in 2008 and has since been translated into Chinese. He is a Subject Editor for Journal of Sound and Vibration and a regular reviewer for many journals. In 2018 he was awarded the Rayleigh Medal by the Institute of Acoustics for outstanding contributions to acoustics.
主讲内容简介
Curve squeal is an intense tonal noise occurring when a rail vehicle negotiates a sharp curve. This lecture addresses the different squeal phenomena and the approaches used to model squeal noise; both time-domain and frequency-domain approaches are discussed and compared. Supporting measurements using test rigs and field tests are also summarised. A particular aspect that is addressed is the excitation mechanism. Two mechanisms have mainly been considered in previous publications. In many early papers the squeal was supposed to be generated by the so-called falling friction characteristic in which the friction coefficient reduces with increasing sliding velocity. More recently the mode coupling mechanism has been raised as an alternative which can exist for constant friction. Moreover, recent evidence is presented for a third mechanism in which squeal can occur from a single wheel mode coupled to the rail under constant friction conditions, even if the rail exhibits no modes. Finally, a short review is given of mitigation measures and some suggestions are offered for why these are not always successful.
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