Research On The Chassis Structure Design And Car Body Suspension System Of Mine Passenger Vehicle

With the increase of mining depth,a large number of mine passenger vehicles are used to transport underground workers.The long-term operation in the environment of low frequency and large vibration amplitude will seriously affect the health of drivers and passengers.With the continuous improvement of people’s requirements for working environment,vibration and noise reduction of mine passenger vehicles have become a hot research direction.Reasonable chassis assembly and car body are of great significance to improve the vibration performance of mine passenger vehicles.In this paper,a mine passenger vehicle as the research object,according to the relevant technical requirements of the mine passenger vehicle,based on the principle of structural mechanics,vehicle development technology was obtained.Based on the existing technical resources and research means,the vibration isolation test of the suspension system of the former mine passenger vehicle under idle condition was carried out.In this way,the model selection and structure design of chassis assembly and car assembly were studied independently,and the design scheme of chassis assembly and car assembly was determined.According to the requirements of the design scheme,the power module and suspension module were designed to match.The three-dimensional model of the new frame module and the new car body module was established.Corresponding constraints were added to the three working conditions of the new frame module(bending,torsion and braking)and the two working conditions of the new car body module(lateral and vertical),and the maximum stress and displacement nephogram were solved under the corresponding working conditions.The strength analysis of the new frame module and the new car body module was carried out.The unconstrained modal simulation analysis of the original and new frame modules was carried out by using finite element software,and the first six modal natural frequencies were compared to verify the rationality of the design of the new frame module and the new car body module.A quasi-zero stiffness suspension system was proposed,and the negative stiffness analytical model was established based on the equivalent magnetic charge method.The mechanism of negative magnetic stiffness was analyzed,and the suspension system was designed according to the optimized stiffness.The influence of the vertical stiffness of suspension before and after optimization on the vibration amplitude of the observation point at the passive end of suspension was studied.The results show that the quasi-zero-stiffness suspension system has large bearing capacity under static force and small dynamic stiffness under excitation force.The magnetic ring negative stiffness mechanism is beneficial to realize the "high static and low dynamic" characteristics of the suspension system,which has important application value for the design of new suspension system.