Vibration Isolation Optimization Of Mining Truck's Cabin Suspension System Based On TPA

Mining truck,in the large-scale mining area as a major means of transport applications more and more common in improving the transport efficiency,at the same time,due to large road roughness and high-power diesel engine vibration,resulting in large noise generated by the car,seriously affected the driver's ride comfort.Therefore,to improve the vibration of the car cab noise and improve the ride comfort of the cab,it become an indispensable consideration in the design process of the tub.This paper takes a self-developed mining truck suspension system as the research object,based on TPA technology to optimize the Mining Truck's Cabin suspension system for vibration isolation,through the cab finite element model and the suspension system model to establish the cab transmission path analysis model.The transfer function of the four suspension points of the cab suspension system is analyzed respectively.Then,the contribution path of the suspension system and the contribution of the suspension point excitation are analyzed.Through the contribution analysis to find out the factors that have great influence on the vibration and noise of the cab,the cab suspension system is optimized to improve the acoustic comfort of the cab.The main contents are as follows:(1)In this paper,the finite element model of rubber suspension is established first.The constitutive model is analyzed by ABAQUS software under three kinds of strain states and three maximum stress levels.The material parameters of each constitutive model are obtained.The Mooney-Rivlin model was used to simulate the material properties,limit and boundary conditions of the rubber superelastic materials.The axial,radial and torsional rigidity of the rubber structures were simulated.Compared with the experimental curve,the simulation curve shows that the simulation curve is in good agreement with the test curve within the allowable range of the error,which proves the correctness of the modeling and analysis method of rubber structure.(2)The finite element model of the cab structure and the finite element model of the acoustic cavity are established.The structural mode and the acoustic mode are analyzed to understand the vibration characteristics of the cab and the sound pressure distribution of the acoustic cavity.Through the sound pressure cloud can be seen,the sound pressure distribution is symmetrical,while the zero sound pressure line in the driver near the ears,thus verifying the cab structure design rationality.Then,the acoustic transfer function analysis and acoustic response analysis of the four suspension points of the cab are carried out respectively.It can be seen that the response of the noise caused by the noise of the cab is given,which lays the foundation for the analysis of the transmission path of the cab suspension system.(3)According to the theory of transfer path analysis,the path contribution of the cab suspension system is analyzed in the Transfer Path Analysis module of LMS.Virtual.lab Noise&Vibration.By considering the transmission path phase and amplitude contribution analysis comprehensively,.the main transmission path which affects the vibration of the cab is found.To improve the vibration noise level in the vehicle,the vibration isolation performance of the cab suspension should be improved,especially in the Z direction Vibration isolation performance.And then through the transmission path related contribution analysis.The influence of the transmission characteristics and the suspension excitation on the cab structure is analyzed,and the influence of the vibration of the cab is mainly caused by the excitation at the suspension.(4)In the LMS Virtual.Lab Optimization module,the three-way stiffness of the suspension is chosen as the design variable,and the acceleration root mean square(RMS)at the cab seat rail is taken as the optimization target.The design variables are sampled by the combination of three levels of all factors and Latin hypercube test design,based on the DOE test design results,a response surface(RSM)model between design variables and optimization targets is established.Finally,the response surface model is optimized by using the Seq.Quadratic Prog optimization algorithm.After verification,the peak value of the noise level of the cab noise after the suspension optimization is obviously reduced,and the NVH performance of the cab is improved.