In-line Engine Crankshaft Inertia Force Analysis And Its Balance

Engine is the source of power of the automobile. When it functions, all the movingparts will generate vibration and noise. These vibration and noise will directly affect theservice life and the work performance of the engine and the vehicle. As the main part ofthe engine power output assembly, the crank connecting rod mechanism will createunbalanced inertia force and unbalanced inertia torque in the movement, these forces andtorques will product vibration and noise when they transferred to the vehicle, which is theimportant factors that affect engine and vehicle harshness (NVH). In this study of crankconnecting rod mechanism, we will use of computer simulation and develop simulationsoftware. Through the simulation analysis of the engine crankshaft stress distributioncombining with the related parameters optimization, we can get the crankshaft stress datequickly. According to the results of the simulation we can design balancing mechanism, inorder to reduce the engine vibration. The study of the engine vibration noise reduction isof great significance.Based on the crank connecting rod mechanism as the study object, throughkinematics analysis, Fourier series analysis and dynamic analysis of the institutions, wewill establish the mathematical analysis model of the institution, and then extend themodel to different number of cylinders of in-line engine, analyze engine crank connectingrod mechanism’s inertial force and inertial moment with these models. Make use ofMATLAB language write programming to translate any of above models into thesimulation models. Run the simulation of engine crank rod system models with itsparameters and save the simulation results. According to the balance principle and thesimulation results to design different balancing mechanism’s parameters and verified theeffect of equilibrium, and compare balance methods with each other.On these basis, using MATLAB GUI software module as a platform to thecorresponding simulation program code and simulation interface integration, realize themutual interface and data transfer switch, finally develop an engine inertia force andmoment of inertia and its balance simulation system which can running independence without MATLAB software.