题目：Transient Thermal Effects and Risk of Seizure of Tilting-pad Journal Bearings

时间：2019年12月9日 9:40

地点：机械与动力工程学院 F210会议室

报告人：Prof. Michel Fillon（法国普瓦捷大学、Tribology International（二区）主编、Mechanics & Industry副主编、Lubricants 副主编）

邀请人：孟祥慧 教授（现代设计研究所）、崔毅 研究员（内燃机研究所）

Biography

Dr. Michel Fillon received his Ph.D degree in Mechanical Engineering in 1985. He is currently a CNRS Director of Research at the Pprime Institute. From 2002 to 2010, he has been Manager of the "Lubricated Contact Mechanics" team and then, Director of Department "Mécanique des Solides" of the Pprime Institute in 2010 & 2011. His current research interests are both experimental and theoretical investigations of hydrodynamic journal and thrust bearings.

He is a Fellow of ASME and of STLE. From 2006 to 2008, he was the Chair of Research Committee of ASME Tribology Division. He is a member of Board of Directors of STLE since 2016. He is also co-Editor-in-Chief of "Tribology International", Associate Editor-in-Chief of "Mechanics & Industry" (EDP Sciences), Associate Editor of "Lubricants" and Editorial member of several other journals. He has been an Associate Editor of ASME Journal of Tribology from 2003 to 2009. He was also the AMPC Chair of 73rd STLE Annual Meeting, May 20-24, 2018, Minneapolis, USA.

Abstract

Nowadays, tilting-pad journal bearings are used under more and more severely demanding operating conditions. Three limits of safe operation were defined: the hydrodynamic limit, the mechanical limit and the thermal limit. It is crucial to determine the hydrodynamic limit of safe operation during start-up for a tilting-pad journal bearing. During start-up, the rapid increase of the temperature in the bearing solids leads to the thermal expansion of both the pads and the shaft. The operating bearing clearance decreases and, when it tends toward zero, seizure occurs. The evolution of the main characteristics (temperature, pressure, film thickness and displacements) versus time is analyzed when a seizure occurs.