Vibration Refinement of Two Wheeler Sub Chassis and Aesthetic Parts Due to Engine Unbalanced Excitation Forces

Two wheeler is important and essential transportation mode in many of the countries across the globe. Designing a motorcycle with better riding comfort and minimal vibration are thus a major challenge for engineers now a day. Engine and road excitations are two source of vibration acting on motor bike or scooter both. These vibrations are transmitted to the chassis, sub chassis, aesthetic parts and then to the rider and pillion. Unwanted vibrations will create discomfort to the rider/pillion and produce noise. Hence, these need to be minimized. This study is focus on diagnosis and control of output vibration response of sub chassis/aesthetic parts due to engine unbalanced excitation force. There are numerous parameter of motor bike/scooter that governs the vibration response of sub chassis/aesthetic parts. Engine unbalanced inertia force characteristics and their transmission to rider and pillion has been studied and reported here. Environmental benefit demands for a complete noise, vibration and harshness (NVH) refinement for lesser pollution especially that of an engine, chassis, sub chassis and aesthetic parts. The objective of current study is to develop an analytical approach to predict output vibration response of sub chassis/ aesthetic parts in isolation of engine and chassis as they are mostly common from mass production model. Semi implicit procedure based on simulation and testing has been developed. Developed procedure is well supported mathematically and validated through physical testing measurement.