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Vehicle frame evaluation at early stages of product development cycle is essential to reduce product turnaround time to market. In conventional approach of virtual validation it is required to evaluate the strength of the vehicle structure to account for the standard Service Load Analysis (SLA) loading conditions. But this paper describes on the strength analysis of scooter frame with derivation of critical static load cases. The critical load cases are extracted from the load-time history while the vehicle was simulated on durability virtual test rigs which is equivalent to proving ground tests. This methodology gives the better accuracy in prediction of stress levels and avoids the overdesign of components based on traditional validation technique. There is significant drop in stress levels using the critical load case approach as compared to conventional load case method.

Two wheelers are widely used as a medium of transportation in Asia. The increased competition challenges automotive manufacturers' to deliver the high quality product to the market. Better acoustic performance of vehicle conveys the impression of a superior quality to the customer. The better acoustic performance of the vehicle gives the competitive edge to the manufacturers. This is putting pressure on the automotive manufactures' to achieve the superior NVH performance of the vehicle. In a two wheeler, apart from the power train noise, transmission noise and exhaust tonal quality; the structure-borne rattle noise threatens to achieve the better acoustic performance of the vehicle. Because of the presence of audible structure borne rattle noise in a motorcycle can convey the impression of poor quality to the customer. In this paper, the focus is on experimental methodology for evaluation and elimination of structure-borne rattle noise in motorcycle.