Research And Development Of Double Wishbone Independent Suspension System For Heavy Off-road Vehicle

With more and more fields such as fire trucks,military vehicles,mining vehicles and so on,the demand for high performance of heavy vehicles with large tonnage has been put forward.The domestic heavy off-road vehicles in the past can not run under extreme terrain conditions,the average speed of off-road vehicles is low,the vehicles are difficult to control,and the drivers are easy to fatigue,which can not meet the requirements of use.It is urgent to develop high-performance vehicles with good performance.Heavy off-road vehicles.Suspension system is the core component of the vehicle,which plays a decisive role in the ride comfort,cross-country and stability of the vehicle.Whether its design is reasonable or not directly affects the performance of heavy vehicles.Based on the project of "Development of Independent Suspension System for a Heavy-duty and High-mobility Off-road Vehicle",this paper develops a double-wishbone long-range variable stiffness coil spring independent suspension,which improves the ride comfort,stability and off-road performance of the heavy-duty off-road vehicle.Firstly,the structure of suspension system is designed.The matching value of bias-frequency damping ratio and suspension stroke are designed with simulation software.The parameters of elastic element and damping element are calculated and analyzed.Secondly,the suspension system1/2 of the former bridge is modeled and dynamic analysis is carried out,taking into account the rationality of space layout and the relevant parameters of steering system,the hard point coordinates of suspension system are optimized,and the simulation model of vehicle positioning parameters of single bridge 1/2 is established,and the rationality of wheel positioning parameters is analyzed.Thirdly,the vehicle model is established in ADAMS software by combining tire model,road model and dynamic model provided by steering system.The vehicle longitudinal angular vibration,handling stability and ride comfort are simulated and analyzed,and the suspension system design is reasonable.Finally,the cross-country performance,ride comfort and operation stability of the test prototype vehicle are tested,which verifies that the performance of the high-powered heavy-duty off-road vehicle with the suspension can meet the use requirements.