1 汇报安排

题 目：参加ASME 2015 IMECE国际会议总结报告会

时 间： 2015年11月23日（周一）下午 16:00–17:00

地 点： 兴庆校区中心三楼一层轴承所会议室

报 告 人：博1115班 王风涛 学号：4111001047

博1015班 李 猛 学号：4110001071

指导教师：景敏卿教授

2 参加国际会议信息

会议名称：ASME 2015 International Mechanical Engineering Congress & Exposition

会议日期：November 13-19, 2015

会议地点：Houston, USA

会议简介：ASME's International Mechanical Engineering Congress and Exposition (IMECE) is the largest interdisciplinary mechanical engineering conference in the world. IMECE plays a significant role in stimulating innovation from basic discovery to translational application. It fosters new collaborations that engage stakeholders and partners not only from academia, but also from national laboratories, industry, research settings, and funding bodies. Among the 4,000 attendees from 75+ countries are mechanical engineers in advanced manufacturing, aerospace, advanced energy, fluids engineering, heat transfer, design engineering, materials and energy recovery, applied mechanics, power, rail transportation, nanotechnology, bioengineering, internal combustion engines, environmental engineering, and more.

3 参会论文信息

Title: DYNAMIC ANALYSIS OF A CYLINDRICAL ROLLER BEARING WITH TIME-VARYING LOCALIZED DEFECTS ON RACEWAYS

Author: Fengtao Wang, Li Chen, Heng Liu, Minqing Jing, Wei Chen, Tonghai Wu

Abstract—An existing defect on the bearing raceway may evolve with the interactions between the bearing elements, and the evolutions of the defect may be divided into different stages. In this study, a dynamic model for a cylindrical roller bearing with localized defects on raceways is developed to investigate vibration character of the bearing in these stages. The coupling of centrifugal forces, gravity forces and the slipping of the roller are considered. The half sine function and step function are used to construct time-varying models of defects in different stages, which is reflected on the local deflection. The system dynamic equations are solved by the fourth-order Runge-Kutta integration method with variable steps. Time domains and frequency domains are used to analyze dynamic responses of the bearing in every defect stage, which can be used as a reference of fault diagnosis. An experimental comparison in the previous study is carried out to validate the proposed model.

Title: PROFILING A CYLINDRICAL ROLLER BEARING OIL-FILM THICKNESS DISTRIBUTION WITH ULTRASOUND

Author: Meng Li, Li Chen, Minqing Jing, Heng Liu, Yi Liu, Shemiao Qi

Abstract—The rollers and raceways in cylindrical roller bearings are separated by an extremely thin lubricant film over a narrow region, which is critical to performance. The ultrasound method has been applied successfully to a range of bearings including journal and ball bearings. But the actual maximum speed that can be measured is limited by the repetition frequency of the ultrasonic pulse. Otherwise, a single measurement point cannot image the thickness distribution of the cylindrical roller bearing. This paper describes the measurement of lubricant-film thickness distribution in a roller bearing by moving the ultrasound transducer. A new ultrasonic pulser-receiver is used to get enough effective measurement points. For a range of loads and speeds, the oil-film thicknesses of four positions along the roller are measured. The influences of the rotating speed and radial load on the film thickness measurement are consistent with the theoretical predictions. The limits of the PRR used in measurements are discussed and the averaging effect of the transducer focal zone size is observed.

欢迎有兴趣的同学届时参加。