Dynamic Modeling And Simulation Of Motorcycle Powertrain System

Motorcycle as a flexible and convenient vehicle,from the perspective of urban commuter,motorcycle has the advantages of low fuel consumption,small parking area,less exhaust pollution and so on.Especially now,the city road traffic jam is serious,the parking lot is short,the motorcycle has shown its advantage in this aspect.However,due to policy reasons,many cities have a "traffic prohibited motorcycle" order,which to a certain extent has affected the development of the motorcycle industry.Each year,the representatives of the two associations will also propose relevant proposals.I believe that the motorcycle industry will have a good development in the future.As the core component of a motorcycle,the powertrain system is the most direct embodiment of the technical level of the motorcycle industry.Although China is a big country for motorcycle production and consumption,it lacks of the technological innovation and has not opened up new directions for development.There is still a big gap in the manufacturing industry.This article mainly focuses on the establishment of a virtual prototype based on Pro/E for a certain Yamaha motorcycle powertrain and dynamic simulation and analysis of the engine and transmission in the multi-body dynamics simulation software RecurDyn.Provide evaluation basis and optimization suggestions.The main contents of the study are as follows:The dissertation elaborates the working principle of the motorcycle powertrain,analyzes the structure of a certain type of prototype machine as well as the performance and index parameters,and builds the powertrain system based on Pro/E modeling software.Focused on the analysis of the modeling of the drum mechanism and the valve spring,described the simplification of the prototype in RecurDyn software and the process of model optimization.To prepare for the following dynamic simulation analyse.Based on the multi-body dynamics simulation software RecurDyn,a partial and integral multi-body dynamics model simulation analysis of the engine and the transmission mechanism was performed.The engine was simulated under different speed conditions,and the transmission mechanism was completely simulated the transformation process from 0 to 5 positions.The model coupling and overall simulation of the engine and the transmission mechanism were completed,and the output shaft speed curve corresponding to the engine speed curve and the gear shifting mechanism 0-5 gear positions was obtained.The simulation results are consistent with the actual working conditions and are also the provide support for the following finite elements analysis and rigid-flexible coupling dynamics.Mesh the crankshafts,gears,and shift forks with RecurDyn's own meshing tools.Through the fatigue durability analysis module of RecurDyn,the fatigue durability analysis of each component was performed based on the stress and strain data of the crankshaft,gears,and shift forks,and the theoretical service life was obtained and compared with the service life data of the physical prototype.The work of this paper shows that the use of RecurDyn software for virtual prototype simulation and dynamics analysis can achieve the optimal design of the system,which is not only intuitive but also improves work efficiency and reduces research costs.Specific to this article,it provides an effective method for the development of the motorcycle industry powertrain,and has a positive significance for realizing the technological innovation of the motorcycle industry.