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Seat system resonant frequencies play an important role in seat design and ride dynamics. So NVH performance of the seats should be assessed from the viewpoint of tactile, acoustic and visual sense. Tactile response is the response of sub-systems, which is induced when the human body contacts steering wheel, footrest or seats. Acoustic response is the behavior of the seat system at the cavity resonance frequencies and visual sense is what we perceive under actual operating conditions. The objective of the present work is to conduct and correlate experimental modal test with FE modal test to identify tactile vibrations. Then the identified main seat modes will be used to set the mode map (seat target) at the stage of full vehicle level. This work will present a practical approach in understanding varied methods and techniques for determining resonant characteristics and for subsequent refinement of FE model.

The world is facing a twin crisis of environmental degradation and fossil fuel depletion. Alternative fuels are seems to be a promising solution for low exhaust emissions. Liquefied Petroleum Gas (LPG) is a prominent alternative fuel with well developed distributed infrastructure and increasing number of Gasoline engines are now being converted to run on LPG considering the fuel economy and low exhaust emissions. This paper describes the bi-fuel (LPG/Gasoline) concept on a single cylinder engine. Air cooled Direct Injection (DI) diesel engine converted to operate on gasoline engine with electronic ignition system and it is having feature to change the spark ignition timing w.r.t. speed. The compression ratio was also reduced suitable to SI operation. CFD analysis was performed to review and subsequently to increase the cooling capacity of the engine.

Design of an efficient cooling system for new generation engines has become a critical task, which requires to be handled optimally at the design stage itself. This approach helps in minimizing the optimization trials, saving time and cost for finalization of patterns and castings. Study of water jacket core in the engine cylinder head and block is of complex nature. Shape, size and location of transfer holes play a vital role in judging the eddies formation and hot spots. It is required to eliminate the hot spots, thus improving cooling efficiency and durability of the component. Use of CFD technique is found to be an effective design tool while dealing with such kind of complex flow problems. In this paper, effective utilization of FIRE CFD code is described for water jacket design of a modular two-cylinder diesel engine being developed from scratch.