Elastic Waves of a Single Elasto-Hydrodynamically Lubricated Contact

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• 作者：S. Schnabel ; P. Marklund ; R. Larsson
• 关键词：EHL contact ; EHL ; Hertz contact ; Elastic waves ; Acoustic emission ; Green’s function ; Ball impact ; Bouncing ball
• 刊名：Tribology Letters
• 出版年：2017
• 出版时间：March 2017
• 年：2017
• 卷：65
• 期：1
• 全文大小：2187KB
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Tribology, Corrosion and Coatings; Surfaces and Interfaces, Thin Films; Theoretical and Applied Mechanics; Physical Chemistry; Nanotechnology;
• 出版者：Springer US
• ISSN：1573-2711
• 卷排序：65

文摘

Elastic waves are widely used for condition monitoring of rolling element bearings through vibration or acoustic emission measurements. While vibration signals are understood to a high degree due to many scientific investigations as well as a long history of usage in the field, acoustic emission signals of rolling element bearings are poorly understood. Therefore, this investigation presents simulation studies and measurements of a single elasto-hydrodynamically lubricated (EHL) contact. In this investigation the EHL contact is a ball bouncing on a lubricated plate. The simulation based on Green’s function and the measurements based on a accelerometer to some extent agree. A shift of zero frequencies towards higher frequencies when compared to Hertzian reference measurements was determined for an infinite plate setup. Taking boundary restrictions into account, elastic waves of a Hertzian contact and an EHL contact only differ by a damping of higher resonances which is most likely caused by the EHL film.