Main Question Research On Reducing Resistance And Increasing Speed For Amphibious Vehicle

High speed is one of the indexes to estimate amphibious vehicle`s performance. In order to advance the speed of amphibious vehicle of China when sailing in water, the strategy of reducing wheels` resistance and increasing speed is proposed, and design a scheme of retracting and deploying wheels.The scheme takes into account vehicle`s space configuration, wheels` deployed state, movement intervene, and security when running on land synthetically. The retracted mode, orientation mode, and prevent wheels from being retracted by mistake when vehicle running on land are all calculated, so wheels can be retracted smoothly and fleetly, and vehicle can run security and stability. The force that retracts wheels is supplied by hydraulic system; design the hydraulic circuit system, by setting the parameters of the hydraulic components and simulating to test the stability of hydraulic system. Displacements of spring and absorber upper ends are restricted by guide way to ensure the security and stability of vehicle. Resistance is reduced caused by wheels as much as possible by optimizeing suspension configuration parameter. Drive shafts and anti-roll bar with low arms are adopted appropriate joint to avoid movement intervene when retracting wheels, and keep wheels` retract and deploy successfully. The change of pressure is received by pressure detector after vehicle into water to control wheels retracting function, and ensure vehicle security running on land.Resistance variety of amphibious vehicles in wheels` retracting and deploying are analyzed using Fluent. Conbine with vehicle`s factual work condition, numerical simulation is carried through by VOF multiphase. Because the bodywork configuration is complexity, and turbulent was severity around it, flows are compartmentalized by using mixed grid to track flow field fully, and using parallel computation to enhance computing speed. In order to improve water loading of amphibious vehicle head, a new anti-wave board shape is designed based on bionics, and using simulating to analyze diversion water function.Simulation is carried through to contrast performance change when suspension is optimization. Firstly, by comparing the simulation results with real vehicle test results of previous vehicle to test the validity of multi-body dynamics model; secondly, simulate the handling stability and riding of previous vehicle and vehicle which suspension optimized, and by changing some parameters of vehicle that suspension optimized, let it remain previous vehicle`s performance basically.