Research on a novel vibration evaluation of motorbike's suspension using multi-body dynamic model under different road surfaces

This study has contributed a new method in analyzing the vibration responses of a motorbike suspension with damping ratio xs using a multi-body dynamic model (MBD). The special feature of this method is that the MBD model can represent the system's behaviors without establishing dynamic equations. This method requires establishing tight kinematic constraints between the model's elements in the XY plane at the connection positions such as road - wheel, wheel - guiding element - suspension - motor's frame in Matlab Simmechanics environment. The results are evaluated based on various response indices such as acceleration, relative displacement, road holding ability, and comfort level according to the cases of operating under harmonic, transient, and random excitations. The MBD model responses in operating cases tends to be consistent with reality and can be applied in the design process of motorcycle suspension based on the evaluation of the influences of xs.