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- W789600583 abstract "Gear rattle is caused by engine torsional vibration (engine order response) imparted to thetransmission components, further causing the gears to oscillate within their functionalbacklashes. These oscillations lead to the repetitive impact of gear teeth, which lead tonoisy responses, referred to as gear rattle. The lack of in-depth research into the effect oflubricant on gear rattle has been identified as a deficiency in the previous research inrattle. The aim ofthe current work is to address this shortcoming.The thesis outlines a new approach in investigating the problem of idle gear rattle. Theapproach is based on the assumption that under idling condition the teeth-pair impactloads are sufficiently low and the gear speeds are sufficiently high to permit theformation of a hydrodynamic lubricant film between the mating gear teeth. This filmacts as a non-linear spring-damper that couples the driver and the driven gears.A torsional single-degree of freedom model is used in the development of the theory. Themodel is then expanded into a seven-degree of freedom torsional model and finally intoan Il-degree of freedom model that also includes the lateral vibrations of the supportingshafts. The Il-degree of freedom model is based on a real life transmission that is alsoused in experimental studies to validate the model.It is found that lubricant viscosity and bearing clearance (lubricant resistance in squeeze)play important roles in determining the dynamics of the system and its propensity torattle. At low temperatures, the lateral vibrations of the shafts, carrying the gears interferewith the gear teeth impact action. The severity of rattle is determined by the relationshipbetween the entraining and squeeze film actions of the hydrodynamic film. When thelatter dominates, the system can rattle more severely.The numerical results are found to correlate well with the experimental findings obtainedfrom vehicle tests in a semi-anechoic chamber and also with those from a transmissiontest rig in the powertrain laboratory." @default.
- W789600583 created "2016-06-24" @default.
- W789600583 creator A5060124428 @default.
- W789600583 date "2007-01-01" @default.
- W789600583 modified "2023-09-27" @default.
- W789600583 title "Combined numerical and experimental investigation of transmission idle gear rattle" @default.
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