A Medium-sized Truck Analysis Design Research And Improvement

Virtual prototype as a new technology, in various fields showed huge technical advantage. This paper apply mechanical system dynamics automatic analysis software (ADAMS), a type of car double front axle system and steering system as the research object, and establish including body, steering wheel, circulation ball type redirector, front axle and double double rocker, suspension, king pin, steering wheel, double front axle system multi-body model of double front axle, existing car steering system design optimization design. On the basis of the virtual model and simulation results, the steering system some kinematical analysis, interference analysis and dynamics analysis check, and by using ADAMS software to double rocker mechanism for the optimization design. By changing the suspension and steering system of the geometric parameter, had a lot of kinematics and dynamics simulation calculation. Got the performance parameters and wheel positioning parameters results curve. Thus for the automotive design and manufacturing to provide the theory basis.Double front axle to car in the social role of increasingly significant, the market demand increases, but related technical research, less related theory in-depth and perfect. In this context, the subject of double front axle to vehicles to system with a comprehensive research. In this paper the turning of the theory to double front axle, steering system structure model and optimization, the dynamic analysis of the steering system. This paper firstly to many bridge theory domestic and international situation, summarizes the main research work of the past and the results; Also pointed out to more bridge has been solved, still face the difficulties and problems. Secondly introduces double front axle to vehicles to institutions and steering theory: key clarify double front axle in the process of steering car ideal kinematic features, and derived the steering wheel Angle the relationship between. Then establish a double front axle steering system of whole mathematical model and its optimization model. For convenience of analysis and modeling will steering system into steering trapezoidal, vertical arm. Knuckle arm has been bars, double swinging rod organization three parts, from part to establish a complete whole mathematical model; Through analysis the double front axle to the car to process, and analyses the double front axle to car in process of steering the inner and outer of idealized Angle and the difference between the actual operation, and connecting with the constraint conditions improved the original optimal objective function is extended, a simple effective feasibility scheme. After two degrees car model of linear theory applied to the front axle to cars, to double double front axle to car kinematical analysis. Mainly by the Newtonian mechanics principle as the foundation, based on the parameters of the dynamic relationship between geometry, with car, in the process of steering the Y axis direction stress and go around the vehicle coordinate system the z axis of torque balance as the breakthrough point is derived to double the kinematics of car front axle differential equations; And the suitable popularization also apply to more than that of kinematics differential axis vehicles equations.This paper based on the kinematics differential equations is derived to double front axle vehicle yaw-rate, at the same time to the expression of the yaw angles gain of objects to investigate the front axle to steady turning performance.Many turn to the car of the truss shaft reasonable matching is very important, not only the same axis between two wheels corner should match each other, but the different steering shaft with side wheels of the corner between should also be a good match. This is more cars and a single axle shaft to turn to the fundamental difference between cars. In this paper to build cars for example, analyzed shaft to mathematical model of car, and the two steering shaft of the rocker mechanism between the motion analysis, based on this optimization design, and the simulation results verify the validity of this method.