الفهرس Only 14 pages are availabe for public view
 |  | from | 122 |  |  |
| | | from | 122 | | |
Abstract
One of the most important sources of noise and vibrations associated with
vehicles is the vibration of driveline system. Most driveline systems include;
manual transmission or automatic transmission systems. In this study, the
torsional vibrations of vehicle driveline of both manual and automatic
transmission systems are considered.
In the literature, the torsional vibration modeling of driveline with manual
transmission includes all torsional vibration excitation sources without
considering the effect of synchronizer torque on the system is presented.
However the synchronizer torque is an essential source of torsional vibration of
the driveline system. In the previous literature of automatic transmission, there
is a shortage study of torsional vibrations of entire driveline system which
includes the automatic transmission with the torsional vibration sources such as
clutches, band brakes, and one way clutches.
The main source of excitation of torsional vibration of the driveline system is
the engine fluctuating torque. A computer program using MATLAB subroutines
has been developed to obtain this torque fluctuation for different engine
parameters for subsequent use in the modeling.
A mathematical model of torsional vibration for vehicle driveline system with
manual transmission, including the effect of non-linear sources in the driveline
system such as non-linear spring stiffness and synchronizer torque on the system
torsional vibrations have been investigated. The model showed that; the
instabilities commonly referred to a shunt or shuffle (longitudinal fluctuation)
could occur during clutch engagement.
A mathematical model of torsional vibration for vehicle driveline system with
three different types of automatic transmission has been constructed. The model
includes the effect of non-linear sources in the driveline system such as the
coefficient of friction in the system of clutches, brakes and one way clutches and
the engagement force. The system torsional vibration has been investigated. The
results showed that; instabilities commonly referred to a shunt or shuffle could
occur during the friction elements engagement due to torsional vibration of the
system.
A computer program using MATLAB subroutines has been developed to
simulate the drivelines mathematical models and generate the results
considering the effect of components nonlinearities.
Finally, a comparison and discussion of the results between the two techniques
of drivelines; manual and automatic transmission systems, have been presented.
Also, a comparison between three different techniques of automatic transmission
systems has been investigated.