The Engine Crank Linkage Multibody System Dynamics Simulation Study

It is useful to correctly predict the NVH in order to enhance the engine noise and vibration performance, to cut down the development time and costs, to improve the ability of competition over the market. Meanwhile, the correct excitation analysis is the base of engine NVH predition and low noise design. The dessertation focuses on the key issues in the engine excitations.Because the influences of the part's elasticity and hydrodynamic lubrication were not considered in the traditional paticle force analysis and multibody dynamic theory, it does not meet the demand of accurate analysis for the excitation. Based on the influences of the parts'elasticity and lubrication, the shaft machanism dynamic performance were simulated by multibody dynamic method. The research contents are as follows.1. To build the parameter model of the 90,V8 diesel engine shaft,using the PRO/E software. To fulfill the assembly of the shaft and the fast automatic parameter model.2. To build the shaft multi body dynamic simulating model in ADAMS. To build the multi flexible body dynamic model, focused on the main slender member. The influences of parts'elasticity are researched.3. To establish the crank linkage mechanism dynamic model which considers the oil film lubrication, focused on the main bearing. To compare the results of the two different models under different bearing clearances.4. To acquire the simulating results of crank linkage mechanism ,considering various effects.The results illustrate that the incentive loads change more gentle and more real reflect the status of mechanism working. So, the multi system dynamic model and simulation is an effective method which couples the main parts'flexibility and lubrication. It estabishs the foundation for the further engine structural dynamic response analysis.