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- W2740413181 abstract "ao Paulo - Brasil Abstract: One of the most flexible parts of the powertrain, in terms of design, is the clutch disk, because it is much less expensive than the engine, the gearbox and the differential gear, and a fine tuning of its parameters may reduce the severity of many NVH phenomena. Two of those phenomena are the Shuffle and the Clunk. Both of them occur when the powertrain is subjected to extreme torque variations, which means that the mean torque, provided by the engine, varies suddenly due to the driving style or any other behavior presented by the conductor, in which they need the vehicle to respond immediately. For this reason, in this work a numerical investigation is performed in order to understand how the parameters of the pre-damper affect the dynamics of the powertrain concerning these two phenomena. A model with 12 degrees of freedom is built, considering nonlinearities on the clutch disk, on the driving gear pairs of the transmission and also on the differential gear. First, this 12 DOF model is linearised, and a sensitivity analysis of the clutch stiffness shows the influence of this parameter on the natural frequencies and mode shapes of this system, given that one of the modes is directly associated to the Shuffle phenomenon. Then, 18 clutch disks with different pre-damper specifications are modelled and simulated in the same dynamic model of powertrain in order to evaluate the sensibility of the Clunk phenomenon to each parameter, and also estimate in which driving gear pair the impacts are more severe. Results show that the input gear pair of the gearbox is more likely to present high acceleration when subjected to sudden torque reversals. The other gear pairs also present significant impacts that occur all at the same instant of time, although their acceleration levels are too low to indicate the occurrence of Clunk. The variation of hysteresis levels on the pre-damper show the expected results, as the time that the system takes to cease vibration increases with the increase of hysteresis. However, changes in the width of the pre-damper show that, concerning teeth impacts, too wide or too thick pre-dampers tend to make the system more prone to more intense impacts." @default.
- W2740413181 created "2017-08-08" @default.
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- W2740413181 date "2013-01-01" @default.
- W2740413181 modified "2023-09-23" @default.
- W2740413181 title "On the Influence of the Clutch Disk's Pre-Damper Parameters on Shuffle and Clunk Phenomena in Powertrains" @default.
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