Dynamics Modeling And Simulation Of Gasoline Engine's Crankshaft Using Kerosene As A Substitute Fuel

To prevent the accidental damage of the crankshaft of Hirth 3203E gasoline engine when having a heavy load test using kerosene, the strength and torsional vibration of the crankshaft were analyzed in this thesis. The following works were mainly studied.1. 3D CAD models of the engine's main components were built by UG, and rigid-flexible coupling multi-body dynamical model of crankshaft system was built by ADAMS.2. A modal analysis of the crankshaft was carried out by applying ANSYS software, and the intrinsic vibration frequencies and modes of the first 10 steps were got, which gave reference for analysis of torsional vibration.3. According to the experimental data, the relationship between torsional vibration and the intrinsic vibration frequencies was simulated and discussed. The simulation results showed that the crankshaft's torsional vibration frequencies were around 460Hz, the crankshaft's twist angle was smaller when using kerosene than using gasoline.4. According to the experimental data, the force and stress of the crankshaft were calculated, and the stress nephograms were obtained. The results showed that the stress concentration points were concentrated in the fillets between the main journal and the crank web side and between the crankpin and the crank web side. The maximum of the crankshaft stress using kerosene was smaller than the stress using gasoline in the same rpm and load.5. According to the pressure indicator graph simulated by GT-Power, the force and stress of the crankshaft using kerosene were calculated in the largest RPM and load. The conclusion in part speed and load was verified after compared with the data using gasoline. The simulation results showed that the crankshaft strength of the original gasoline engine can meet the demand of using the kerosene as the substitute fuel.The research work in this thesis was very helpful to the project of using kerosene as a substitute fuel in Hirth 3203E gasoline Engine, and also proposed a new method to study the strength and the torsional vibration of crankshaft.