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This paper presents a mathematical approach for creating a vehicle model incorporating the characteristics of tires, suspension, forces acting at the tire/road interface, suspension forces, wind forces and gravitational forces. The model has been made for a middle class limousine. Two sets of equations, one set for the translatory motion and the other set for rotational motion have been derived. Torques, forces and angular or longitudinal velocities have been chosen as variables to act as interface between different sub - models. The complexity of the vehicle model created has been optimized for vehicle dynamics simulation. All the forces have been found in the undercarriage co-ordinate system. While substituting them in the equations of motion they are multiplied with the transformation matrix for the transformation from the undercarriage to the inertial co-ordinate system.

The design of Automotive Suspension has been a compromise between the three conflicting parameters of road holding, load carrying and passenger comfort. For the past three decades, the introduction of increasingly sophisticated electronically controlled components into automotive suspension, redefines the boundary of the compromises. In this paper, the first part describes the various suspension systems. The second part describes the road disturbances caused by the road followed by the need and history of preview system. It is also specified the necessary hardware required for the system along with two different preview sensor configurations. It is also explained how to generate the road surface from preview sensor. From the various literature results, it is conclude that active suspension with preview control will suit Indian road conditions.

A comprehensive analysis of combustion, heat release, heat transfer and performance of a low heat rejection diesel engine was carried out for its potential development over the conventional diesel engine. A model for the prediction of combustion and heat release has been formulated and developed, based on the two zone combustion modelling concept of WHITEHOUSE.N.D/WAY.R.J., and BALUWAMY.N. The combustion model takes into consideration on a zonal basis, the details of spray formation under non-swirl and swirling conditions, spray wall interaction, heat transfer, preparation and reaction rates. The penetration, deflection and growth of the spray are calculated based on the momentum added due to entrainment under swirl and non-swirl conditions. The combustion parameters were calculated based on the first law of thermodynamics using energy and enthalpy coefficients. The gas-wall heat transfer calculations are based on ANNAND.W.J.D, ANNAND.