The Study Of The Mounting System For One Kind Of Military Off-Road Vehicles

Research and development of off-road vehicles with high mobility will be contributed to enhance military mechanical and mobile capability. There have no such type of off-road vehicles in the domestic army at present. It is necessary to develop the first vehicle systems with high mobility in our country for increasing the army militancy. To meet practical demand of off-road vehicles we must solve some technical problems including the design of mounting systems, sealing performance of main reducing gear and slope climbing characteristics of whole vehicle. Some huge impact to the bodywork instances will occur, such as the accessory crazed on bodywork floor system, frame ruptured, cushion destroyed on bodywork counting system, etc. Therefore, research of the mounting system is necessary.Under the support of "the Tenth-Five-Year Plan" army project, the systemic research on the mounting system of off-road vehicles is developed in this thesis. The failure mode and stress status of body mounting system is firstly analyzed. The corresponding modification method is proposed. The whole layout strategy of body mounting system is determined based on kinetic analysis. The optimal structure parameter is achieved using FEA and experimental method. The results show that the improved mounting system could meet the practical requirement. The major conclusion is following: 1. There exist several failure problems of body mounting system during the process of 30000km road test. The analysis result shows that the accessory craze on bodywork floor system, frame rupture and cushion destroyed on bodywork counting system will occur during the test. The optimal structure parameter could be used for solve above mentioned failure problems.2. Based on isolation principle the vibration source, noise and vibration transmissibility of body mounting system is analyzed. The simplified kinetic model of mounting system is developed to determine the precise position of front and rear mount. By applying weight distribution principle the isolation design, layout selection, structure design and load distribution of body mounting system are proposed in this part of thesis.3. The optimal design of body mounting system of off-road vehicles is developed. The 20% vibration transmissibility is selected as the optimal design strategy. By using the improved structure parameter of mounting system, the FEA model of off-road vehicle is used for analyze the structure stiffness, stress and vibration modal of Body-In-White, frame and whole vehicle. The road test results show that the improved mounting system could meet the practical requirement.