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The diesel power train (engine and transmission) is the most significant mass contributor in a three- wheeled vehicle. High idling vibrations from the engine get transmitted to the structure and the body panels through the engine mounts. Isolation of these vibrations by proper design of rubber mounts is the most effective engineering approach to improve ride quality of vehicle. In the present study, a mathematical model of the powertrain and mount system is developed; with the engine and transmission being assumed to behave as a rigid body (6 degrees-of-freedom) and the compliance comes from the mounts. As a first step, the modes and natural frequencies are obtained. Following this the response to unbalanced inertial forces for an excitation frequency range of 20-60 Hz (1200-3600 rpm) has been obtained. The model is validated by comparing its results with results of previous published research work.

In recent years graphical dynamic system simulation has become very important in the design and development stage, as new strategies can be examined without expensive measurements. This paper describes the development of a real time simulation model for a turbocharged diesel engine and an automatic transmission of a tracked vehicle using graphical programming environment in Matlab/Simulink. This work is part of a vehicle simulation model which is under development. A Mean Value Engine Model (MVEM) is used for simulation of engine dynamics. A Torque Converter (TC) is used as a fluid coupling between the engine and the transmission gearbox. This model is used to predict the dynamic response, both in steady and transient operation. Various illustrative studies have been conducted to demonstrate the capability of the model to predict the transient system response.