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A Model for motorcycle is established with the motorcycle dynamics software BikeSim, and the simulations on motorcycle ride comfort are conducted under two conditions of B-grade road stochastic and pulse excitations. Then with minimizing the acceleration root-mean-square values of both pitching and vertical vibrations as objectives, the characteristic parameters of suspension as design variables, and iSIGHT as platform integrating BikeSim and MATLAB, a multi-objective optimization is performed with Pareto frontier obtained. The results of comparison between the curves and data of pitching and vertical vibrations before optimization and related simulation results before optimization indicate that the ride comfort of motorcycle is improved. [ABSTRACT FROM AUTHOR]

A 4 DOFs dynamics model for a car with semi-active suspension is established, a LQG controller for semi-active suspension is designed by applying optimal control theory, and a simulation on system model is conducted under Matlab/Simulink environment. With body vertical acceleration, pitch angular acceleration, suspension dynamic deflection, tire dynamic displacement and suspension control force as the performance evaluation indicators of vehicle LQG control, the weighting coefficient for each indicator is determined with both analytic hierarchy process (AHP) and improved analytic hierarchy process (IAHP) respectively. The results show that compared with passive suspension, adopting semi-active suspension can effectively enhance the ride comfort of vehicle, and compared with AHP, using IAHP can more easily determine weighting coefficients, resulting in handier design of LQG controller. [ABSTRACT FROM AUTHOR]