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Frontal crash is the most common type of accidents in passenger vehicles which results in severe injuries or fatalities. During frontal crash, some frontal vehicle body has plastic deformation and absorbs impact energy. Hence vehicle crashworthiness is important consideration for safety aspect. The crash box is one of the most important parts in vehicle frontal structure assembly which absorb crash energy during impact. In case of frontal crash accident, crash box is expected to be collapsed by absorbing crash energy prior to the other parts so that the damage to the main cabin frame and occupant injury can be minimized. The main objective of this work is to design and optimize the crash box of passenger vehicle to enhance energy absorption. The modeling of the crash box is done in CATIA V5 and simulations are carried out by using ANSYS. The results show significant improvement in the energy absorption with new design of the crash box and it is validated experimentally on UTM.

A three-wheeler is a symbol of mobility at low cost for a common man in India. Due to high loading compared to its 2-wheeler counterpart, the 3-wheeler emit higher emissions and serious efforts are being made by the manufacturer to minimize the emissions. ARAI and Emitec have undertaken a Technology Demonstrator Project to investigate the application of metallic substrates and Emitubes for a typical carburetted 2-stroke 3-seater 3-wheeler with an aim to introduce a cost effective practically viable option of reducing exhaust emissions to meet INDIA 2000 emission norms. Now-a-days, there are 3-wheelers available which are offering lower emissions levels. It was the intention of the authors, not to use such a clean vehicle for a better demonstration of the efficiency of current catalyst technology. Here, a 3-wheeler manufactured in 1996 has been selected, for which a converter is designed employing a software developed by Emitec.

The paper describe investigations on the vibration characteristics of a gasoline engine due to piston slap and a diesel engine due to combustion. Engine parameters and vibration data were recorded and time series signals were obtained. The effect of speed, load and other engine parameters on vibration is investigated. Vibration due to piston slap is analysed with reference to major-minor thrust relationship, cylinder to cylinder variation, piston-slap force diagram and vibration-frequency curves. The experimental results suggest that all reciprocating engines would exhibit a complex vibration pattern due to piston slap at harmonic series of discrete frequencies, and the reason for this is analysed. The vibration transmitted by engine structure in response to the in-cylinder pressure development is termed here as ‘Vibration due to Combustion’ and is assessed from the spectrum of the Combustion Pressure curves and their derivatives in terms of time.