Research On Front Independent Suspension Of The Minig Truck

As an important transportation tool of earth stone, mining truck is widely used in mining, metallurgy, construction, chemical engineering, municipal and other industries, which has a huge consumption demand. For a long time, the earth-moved transportation equipment required for open-air mining engineering has mainly been imported, because of the weakness of basic industries in our country. However, mining trucks produced independently by domestic companies simply meet functional demands, whose chassis structure is simple and ride comfort is poor. Therefore, it is of great practical significance to develop and design the core competitive products early with accurate handling performance and good ride comfort.Firstly, guide mechanism hardpoint coordinates of front axle double wishbone suspension and disconnected steering trapezoidal mechanism are designed, studied and optimized by means of MATLAB in this paper. Moreover, front axle dynamic model is established in ADAMS/Car and the simulations of wheel travelling and steering kinematics are carried out. Then, irrational wheel alignment parameters are optimized with Insight module so as to reduce the variation in the process of wheel jounce and rebound, and steering trapezoid mechanism meets Ackerman cornering relation well. Eventually, three-dimensional models of front double wishbone suspension and steering system are accomplished in CATIA.Next, filtered white noise time domain model is selected as the road input simulation signal. According to the common driving conditions of mining trucks, road simulation models in B, C and D class are established. Furthermore, linear and nonlinear mathematical models of the hydro-pneumatic spring are constructed. Time domain and frequency domain models of half suspension are set up in Simulink and dynamic simulation is carried out. Compared with that of the linear suspension, the evaluation index of nonlinear suspension is better. Besides, suspension system and the road have two resonance peak frequencies.Then, force conditions of knuckle and lower control arm are analyzed. ANSYS finite element model is established and analyses of static force and modal are made, the results of stress and strain indicate that strength and rigidity meet the requirements, meanwhile natural frequency avoides resonance frequency caused by uneven road surface excitation.Finally, rear suspension, body, powertrain and tire subsystems dynamic analysis models of the mining truck are separately built in ADAMS/Car. Afterwards,these subsystems are assembled with six-cylinder testrig. What’s more, full vehicle dynamic model of the mining truck is set up. Subsequently, simulation experiments of random road excitation and pulse excitation are carried out. Consequently, the analyses show that the absolute values of vibration accelerations in front axle suspended mass and vehicle center of mass are less than the specified values. In conclusion, ride comfort meets the evaluation criteria.