The Study On Optimization Of Powertrain Mounting System Of YC6K520 Mining Vehicle

The power assembly of mining dump truck includes engine,transmission and clutch.The engine is the power output source of the whole truck.The internal rotation,fuel combustion and piston movement of the engine are the main excitation sources of vehicle vibration and noise.The powertrain mounting system is a buffer system installed between the powertrain and the frame.Its functions are as follows:to support the total amount of engine assembly;to cushion the external impact and prevent the collision between the engine and the surrounding parts;to isolate the excitation caused by the uneven road surface and the engine itself,so as to avoid the occurrence of the frame and the powertrain.Resonance.Whether the mounting system design is good or not is related to the vehicle’s driving flexibility.In this paper,the vibration theory of powertrain mounting system is studied,the vibration isolation principle of powertrain mounting system is given,and the vibration test of mine dump truck with idle vibration problem in this paper is carried out.Based on the experimental results,the direction of optimal design of power train of mine dump truck is determined,and the parameters of power train of mine dump truck are given.The dynamic model of powertrain mounting system is established in ADAMSThe basic principle of optimum design of powertrain mounting system is analyzed,and the matching criterion of natural frequency of the mounting system and the decoupling requirement of the mounting system in optimum design are emphasized.Based on the energy decoupling method,the design of the powertrain mounting system with the maximum mode decoupling rate and the stiffness value of the mounting system is established.Variable multi-objective optimization model is optimized by multi-objective genetic algorithm,and the whole optimization process is integrated in the Isight software platform.The optimal stiffness values of four-point and six-point mounts of the powertrain mounting system of mine dump truck,and the optimized modal frequencies and modal decoupling rates are given respectively Vibration test of the optimized powertrain mounting system is carried out to verify the feasibility of the optimization design of the powertrain mounting system,and solve the problems of idle vibration and steering wheel jitter during the use of the mine car with Pengxiang.The research content of this topic can provide theoretical basis and method for dynamic modeling and optimal design of powertrain mounting system,and help to improve vehicle NVH performance.