Abstract
Determining the modes of load on powertrain is considered as a significant problem that related to vehicle design. The modes of powertrain are determined by studying torsional dynamics of powertrain. It costs many efforts and time to solve this problem by traditional methods because the powertrain is complex with many types of part and component. Today, the vehicle calculation and designing were resolved by many advanced software. The paper presents research content of simulation of powertrain torsional dynamics by the Matlab Simulink software in order to determine the moving loads of powertrain in different working conditions (such as departing, braking suddenly, engaging clutch suddenly) and considers the factors influenced on its dynamic. The study started at analyzing mechanics and torsional dynamics model in each block of powertrain and the whole powertrain, then establishing mathematical equations and building Matlab Simulink subsystems to simulate torsional dynamics of every block of powertrain such as shafts, gears, gearbox, clutch and cardan shaft. The Matlab Simulink model which simulates the whole powertrain is connected by the subsystems. For running the modeling program, the factors, input parameters and working loads were got from a real vehicle. The output parameters were torques, displacement, velocities and acceleration of rotation over whole powertrain. The simulation results show visually torsional vibration of powertrain.
Keywords: powertrain, torsional dynamics, simulation, Matlab Simulink