Vibration Analysis And Optimization Of Engine Mounting System Of Mine Dump Truck

With the continuous development of mining dump truck,the performance of ride and comfort continue to increase,so the NVH performance of mining dump truck is particularly important,it is one of the important indexes of evaluating ride and comfort.Large tub of engine weighs 10 tons or more,by connecting the mounting bracket and the frame,this kind of structure caused by the suspension system is different from the structure of the traditional ones.At present, such a structure for mounting system for analysis and optimization of relevant literature is at a less.This study provide a basis for the dump truck parameters suspension rigidity,it has a great value in engineering application.Based on the large mining equipment as the research object,establishing the motion differential equations of engine mounting system.Through the related paramet ers of powertrain mount system,establishing the finite element model of mining equipments suspension system,and experimenting the modal analysis and random vibration analysis on it respectively.In order to reduce the vibration transmissibility and improve the NVH performance effectively,based on the APDL of ANSYS software of finite element optimization techniques in this paper,the stiffness of engine mounting system is optimized,the optimization results succeed to avoid the resonance frequency of the system,and the response amplitude has fallen dramatically,providing a reference for the design of a large tub suspension system.The main contents of this paper consists of the following components:(1)Introduced the research background and significance of this topic,the development of large-scale mining dump truck, present situation of the development of the engine mounting system.At the end of the section,the full text research technique route is given.(2)Expounding thetheory of the vibration of the engine mounting system,establishing the motion differential equations of engine mounting system,determining the arrangement form and installation Angle of the rubber mount.(3)This paper introduces the methods of parameters for engine mounting system,giving the corresponding experimental data parameters,establishing the finite element model of mining equipments and providing the parameters basis for the modal analysis.(4)Establishing a finite element model of the mine dump truck suspension systems.According to the main excitation frequency,modal analysis was carried out on the vehicle system,high frequency modal analysis and random vibration analysis was carried out on the engine mounting bracket.It is concluded that the engine in the low frequency of 5Hz,and the high frequency 163 Hz and 250 Hz or so appear obvious resonance phenomenon.(5)Based on the APDL of ANSYS software of finite element optimization technology of rubber suspension stiffness optimization,three groups of optimization results are obtained,choosing the results which meet the requirements of the experiment by artificial judgment,seting the front and rear suspension dynamic stiffness values.(6)Modal analysis was carried out on the vehicle system again, and so was the high frequency modal analysis and random vibration analysis on the engine mounting bracket.To compare with the front and rear optimization of response amplitude of the engine mounting system,verify the feasibility of this topic by using optimization method.