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Scooter segment growth is tremendously increasing in India. The increased competition challenges automotive manufacturers to deliver the high quality and high reliable product to the market. Higher reliability involves increased durability testing which involves time and cost. Stress testing a part of durability is initially conducted on prototype vehicles for structural design validation and then later on production units to ensure its structural integrity. The obtained data from the tests can be used for future structural design improvements. Scooters with small tires, suspension limitations transfers more loads to structure, challenges engineers to design robust structure without compromising on weight much. It is necessary to look at Real World Usage Pattern (RWUP) and to create a stress life cycle block for simulation of accelerated testing, thereby optimizing the testing time and the development costs.

Motorcycle segment is growing very fast in India and companies are paying more attention to ride comfort performance of their vehicles, as it is a potential factor for success. The spring and damper characteristics of the suspension needs to be optimised for desired ride quality. Achieving a very good level of ride comfort on rough and smooth terrains combined with an equally good level of handling in the speed range of 20 km/h to 120 km/h is a challenging task as the roads have a mix of both high undulations as well as smooth and flat surfaces on highways. Inverted telescopic front suspension is one of the options engineers look at, to enhance the ride comfort of motorcycles without compromising on the handling behaviour too much. This paper focuses on the optimization of inverted telescopic suspension system in frequency domain. A quarter car model of suspension system is used to describe the dynamic performances such as ride comfort, road holding and working space on roads.