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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.

A sports segment two wheelers should never compromise in styling, performance and safety. One of the styling and performance improving feature is adding fairing to the vehicle with the headlamp fixed in it. The headlamp will not rotate with the steering system causing visibility issues to the rider during cornering. In order to correct these visibility issues, a self adaptive front lighting mechanism has been constructed to rotate the headlamp about its vertical and longitudinal axes during cornering based on the steering angle and the vehicle lean angle. Visibility area has been increased significantly towards the inner side of the corner. This system works mechanically to make it affordable in Indian market.

Optimization of motorcycle ride characteristics is vital for achieving good ride comfort over different terrains. Ride characteristics in typical commuter motorcycle on Indian roads are mainly governed by suspension elements like helical spring and hydraulic damper. Damper force velocity characteristics are most significant for achieving best motorcycle ride behavior. A broad simulation of vehicle ride characteristics and optimization is available but there is a need for a holistic approach for deriving damper force velocity characteristics with dual slope (low speed and high speed damping) and identification of its optimum changeover damper velocity. This paper presents an objective methodology, based on analytical simulation and real time measurement, developed in order to derive optimum dual slope damper force velocity properties in terms of vehicle ride comfort.

Motorcycle segment is growing very fast in India. The average riding speeds are much less owing to the road conditions and traffic. The roads have a mix of both high undulations as well as smooth and flat surfaces on highways. Achieving a very good level of ride comfort on such rough & smooth terrains combined with an equally good level of handling in the speed range of 20 to 80 Kmph is a highly challenging task. Monoshock rear suspension is one of the options engineers can look at, to enhance the handling behavior of motorcycles without compromising on the ride comfort too much. Our work is aimed at building a generic analytical model of typical mono shock motorcycle rear suspension that will enhance the understanding of system kinematics and extending its application for optimizing the design towards a better performance of the complete motorcycle. Both direct mount and linkage mount monoshock suspensions are studied.