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At present, vehicle testing in laboratory is one of the important phase to quicken the product validation process. In the early phase of laboratory testing it is required to evaluate the strength of the vehicle structure through physical rig setup which represents the consumer’s usage. Two and Multiple poster input excitation are among the laboratory rig testing to represent the actual road are used to predict the durability of vehicle components. The road inputs through the poster are known as drive files, a feedback controlled system which reproduces the track or real road recorded specimen’s accelerations, displacements and strains in laboratory. Derivation of drive files in poster testing requires iteration of physical specimen to exactly replicate the actual road. This paper discusses about generation of drive files as inputs for poster actuation with virtual model(as a substitute for actual model)which is applicable in areas of vehicle durability and ride comfort studies.

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 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.