Optimization Design Of Powertrain Mounting System Of Mine Dump Truck And Analysis Of Ride Comfort

With the development of technology for mining dump truck, people’srequirement on its riding comfort is increasing, and the vibration and noiseperformance have been the important standard to measure whether the mining dumptruck is good or not.Powertrain is the main excitation source of mining dump truckwhich often results in passenger’s uncomfortable. Mounting system connects theengine with the frame of mining dump truck, mainly isolating the mining dump truckfrom both vibration and noise generated by the engine. Choosing appropriateparameters can improve the mining dump truck’s comfort and NVH (Noise,Vibration and Harshness) performance, improve the stress and motion state betweenthe powertrain and the frame and reduce the movement interference among parts,thus ensuring its safety and reliability.The SF33900-type mining dump truck is selected as the research object in thispaper, firstly, vibration theory of the engine mounting system is introduced briefly;secondly, a six-DOF rigid body dynamic model and mathematical model of thepowertrain mounting system are built up and carried on the robust optimizationdesign. Finally，based on multi-body dynamics simulation model with the powertrainand vehicle system, the vehicle’s ride comfort is analyzed and optimized. Maincontents of this paper are as follow:1. This paper summarizes the status research of domestic and foreign mountingsystem; studies the fundamental theory and design method of the powertrainmounting system of mining dump truck; summarizes the design requirements ofpowertrain mounting system; presents the design process of the powertrain mountingsystem of mining dump truck.2. Concerning the characteristics of electric drive truck powertrain structure,based on vibration theory, a six-DOF rigid body dynamic model and mathematicalmodel of engine mounting system are built up.Model analysis is carried out and thevibration isolation performance of the mounting system is simulated in the typicalconditions of the powertrain. The results show that the vibration isolationperformance of the suspension system is poor.3. The frame as supporting parts of the powertrain, the distribution of naturalfrequency of the powertrain must be isolated from it. Based on finite element method, the model of the mining dump truck’s frame by taking shell unit as basic unit is setup, the mode vibration model and proper frequency of the frame are calculated bymode analysis.4. This paper analyzed the sensitivity of the energy distribution of powertrianmounting system to the stiffness parameters to identify the impact of the suspensionstatic stiffness parameters. In order to improve the vibration isolating characteristicsof suspension system, set the natural frequencies of mount system and modaldecoupling as target, considering the uncertainty of parameters, this paper setsparameters as random variable with normal distribution feature and uses6sigmarobust optimization to design the mounting system. The result showed that thepowertrain mounting system can still keep high robustness when the parameters hada±10%variation around their nominal values.5. In addition, a full powertrain-vehicle model is proposed to get true reflectionof the vibration isolation performance of suspension. The secondary general rotationdesign is selected to optimize the design of the experiment to obtain mining dumptruck response surface model; the vehicle ride comfort is optimizated and thecontrast analysis of ride comfort performance before and after is made.