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Quality of Ride is one of the Important performance parameters of automotive vehicles, especially in the passanger vehicles. In this paper, the guidelines of ISO:2631-1997 and BS: 68441-1987 are applied on vehicles to assess the ride quality of vehicles objectively. Vibration inputs in terms of acceleration are acquired at 3 locations in 12 axes. These are then processed using the frequency weighting functions. The analysis gives a single number called “Overall Ride Value” which is proportional to passenger discomfort in vehicle. The axes which are principal sources of discomfort and the frequency range, which is most responsible for discomfort, are identified. The present work also includes experiments conducted to see the effect of variation in load, road surface, and vehicle speed on ride quality. The data obtained by this procedure can be used for assessment and comparison of ride quality characteristics of vehicles in detail.

Chassis of automotive vehicles are modified for a number of specialist roles for certain typical applications. Modification of standard chassis for such roles result in increase of payload, axle load, and shifting of position of centre of gravity as compared to original vehicle. These changes have effect on performance parameters of vehicle including dynamic stability and handling. The testing of the modified vehicles for parameter of handling and stability was being done so far at VRDE in the classical method i.e. subjective evaluation by opinion of the expert driver. With the dedicated instrumentation procured now evaluation of the handling and stability characteristics of a vehicle modified for the bullet proof vehicle role was carried out objectively, generally following the ISO test procedures. This study clearly revealed the limitation of roll over stability of the modified vehicle, necessitating some design modification to the suspension system and tyre system of the vehicle.