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Buses are commonly used mode of transport in less motorized countries. With growth in economy, the numbers of buses have increased tremendously both in rural and urban areas. With increased number of buses, the issue of safety of passengers and the crew assumes special importance. A large number of bus accidents involve rollovers and falling into ditches or downhill sides. Therefore, the structural integrity of buses is critically important. In order to provide buses with minimal rollover resistant superstructure, Economic Commission for Europe, Regulation Number 66 (ECE R - 66) was issued in the early eighties. Type approval can be granted on the basis of rollover test on complete vehicle or body section or pendulum test on body section or by calculations. This paper includes the numerical simulation of rollover test of a full bus body according to ECE R-66. It also includes similar simulation of a representative bus section and validation with the experimental rollover test.

The demands resulting from stringent noise legislations are increasing rapidly. It has become necessary to establish optimum design methods for low noise engines. In this paper, a methodology for structure borne engine noise control using the combination of experimental and computer aided techniques is presented. Sensitivity analysis for noise reduction is carried out for various structural modifications. The major structural improvements include addition of ribs, stiffening plate and crankcase shape modifications. The final models were validated using experimental analysis techniques.