An Advanced Multibody Model for the Analysis of Motorcycle Dynamics

摘要

This work presents the latest improvement of the non-linear and fully parametric motorcycle multibody software developed at D1MEG in several years.The model includes both rigid and flexible bodies,different kind of suspension linkages (such as paralever and swingarm for the rear frame,telescopic fork,telelever,and duolever for the front),a special model for the road-tire interaction and a transmission model which includes the compliance as well.The mathematical model has been entirely derived in a symbolic form,then it was implemented in a Fortran program named FastBike.The developed software makes it possible to carry out three different kind of simulations:steady state simulations,stability and frequency domain simulations and time domain simulations.It is worth highlighting that,due to the intrinsic instability of two wheeled vehicles,time simulations cannot be performed in open loop.Therefore,a virtual rider which includes a vehicle tracking with look ahead strategy and a self-tuning strategy has been developed.Some simulation examples are illustrated and discussed,and comparison between experimental tests are given.