Abstract
The vehicle drive line system is subjected to torsional vibration from different sources of the system such as; engine fluctuating torque, Hook’s joint and the final drive. However, the essential source is the friction torque induced in the friction elements, during their engagement. In the automatic transmission system, the planetary gear set includes several friction elements such as; clutch, band brakes, and one way clutch. During the engagement, severe torsional vibration is induced by friction which is noticeable by the passengers in the form of what so called vehicle shunt. In present paper, a torsional vibration model for Drive Line (DL) system includes three different configurations of automatic transmission is constructed. A computer program using MATLAB subroutines is implemented to obtain the system response. Effect of system parameters on the dynamic behavior and stability has been investigated. The system damping and the trend of the friction coefficient have an essential effect on the dynamic behavior and stability of the system. The system response is now predictable with change of the system parameters which opens up the opportunity in future to control the vibration level.
Highlights
Vehicle transmission noise and vibration constitute a serious problem in the driveline system [1,2], which is concerned in the present study
The system response is predictable with change of the system parameters which opens up the opportunity in future to control the vibration level
The overall equivalent torsional vibration model consists of idealizing the complete Drive Line (DL) system as a set of inertia discs linked together by torsional, linear and massless, springs which reproduce the dynamic behavior of all constituent parts [3]
Summary
Vehicle transmission noise and vibration constitute a serious problem in the driveline system [1,2], which is concerned in the present study. Investigation of the torsional vibration characteristics of a transmission is simplified if the actual system is firstly replaced by a dynamically equivalent one. Certain parts in the transmission revolve without transmitting torque. These parts are not subjected to torsional load and considered as inertias only. The overall equivalent torsional vibration model consists of idealizing the complete DL system as a set of inertia discs linked together by torsional, linear and massless, springs which reproduce the dynamic behavior of all constituent parts [3]. The interest of this paper is to model and investigate the main sources of excitation of the torsional vibrations of a DL system includes in an automatic transmission. The effect of the system design parameters on its dynamic behavior and stability is concerned
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