Study On Hydro-Mechanic Differential Turning Performance Analysis And Parameters Matching Of Tracked Vehicle

The hydro-mechanic differential turning system is a new-style turning mode using hydro-mechanic continuously variable transmission theory, effectively improves the turning performance of trackle vehicle, possessing widely developing promise well. The designing theory and ways, transmission characteristic model establishment and simulation of turning system, turning performance of vehicle, parameters matching of turning system are finished adopting theory analysis, simulation calculation, test research and etc in this paper.The development actuality of tracked vehicle and its turning system are introduced. The structure, working principle, turning performance and application and study actuality of hydro-mechanic differential turning system are emphatically discussed. The study contents and issue being solved are put forward.The hydro-mechanic transmission characteristic of output distributing transmission and input distributing transmission are theoretically analyzed. Combine to the turning demand of tracked vehicle, the hydro-mechanic differential turning system transmission scheme is decided, which has the simple structure, speed decrease and torque increase characteristic, adapt to the farm tracked vehicle.The hydro-mechanic differential turning manoeuvre system of certain tracked vehicle is provided. The turning performance of tracked vehicle can be fulfilled.The system rotate speed,torque,power and efficiency characteristic are theoretically analyzed. The formula of turning system and its parameters is given. The power transfering rule and efficiency calculation under different working conditions of this system are qualitatively studied. The maths and simulation models of dynamic characteristic of hydro-mechanic differential turning system are established. The system parameters influencing system dynamic characteristic are simulated. The theory base of design, parameters matching and optimization of hydro-mechanic differential turning system of tracked vehicle is provided by these simulation results.By analyzing turning kinematics of track vehicle, the calculating formula of turning radius and turning angular velocity considering track slip are educed. The hydro-mechanic differential turning trace model of tracked vehicle is established by coordinates switch. The turning trace simulation results can be used to turning resistance analysis. The hydro-mechanic differential turning dynamic model of tracked vehicle is established. The evaluation indexes of stable and dynamic turning performance are given out. The influence of design parameters and using parameters to stable and dynamic turning performance of tracked vehicle are studied using Newton-Raphson iterative method and simulation. This can help to actural vehicle using research.The parameter matching of hydro-mechanic differential turning system of tracked vehicle is induced to multi-goal, multi-parameters, nonlinear optimization question. The genetic algorithm is efficient way to solve this question. The maths models of parameter matching of hydro-mechanic differential turning system are established using genetic algorithm and the matching flow is put forward. The parameters matching of hydro-mechanic differential turning system of DFH1302R farm tracked vehicle is achieved and the matching result is satisified. The matching way can be used to design hydro-mechanic differential turning system.On different working conditions, the characteristic of hydro-mechanic differential turning system and turning performance test of tracked vehicle are performed. Basing test data, the theorictial research results meet turning requirment of tracked vehicle.