Research On Suspension System Of Forest Fire Truck Based On Dynamics Simulation And Optimization

In recent years, forest fires occur frequently, the development of forest fire-fighting equipment especially forest fire vehicle has been paid more and more attention to by people. Forest fire trucks have developed from single simply to functional diversification. So the need of its quality has been higher and higher. As a sort of professional vehicles which deliver forest fire personnel and equipment, forest fire suppression personnel carriers not only require good through performance, but also require more greatly riding comfort than other types of forest fire vehicles.Based on multi-body system dynamics theory, this paper was taking forest fire suppression personnel carriers as the research object. The front and rear suspension consisted of the longitudinal leaf spring. First, the evaluation method of vehicle riding comfort was introduced and the riding comfort test was held under the highway road and forest road in the testing field according to the relevant technical requirements. The total weighted RMS acceleration value located under the driver’s seat were respectively0.854m/s2and1.797m/s2.The results showed that the riding comfort of forest fire vehicle needs to be improved when driven through the forest pavement. Then with the vehicle’s actual structure parameters, the vehicle multi-body dynamics simulation model was established in the virtual prototype simulation analysis software ADAMS, including front and rear suspension system, chassis system, tires system, power transmission system, braking system, steering system, etc. The modeling of the steel plate spring independent suspension was emphasized, and the modeling principle and process were introduced in detail. The test and simulation for partial frequency of suspension was carried on, which verified the validity of the whole vehicle model. Then the effects of the suspension on ride comfort of the vehicle was analyzed, and the function, which took the front and rear suspensions’stiffness and absorbers’damping as design variables and the total weighted RMS acceleration value located under the driver’s seat as the target variable, was established to optimize the design of elastic elements and damping elements in suspension. Finally, the riding comfort simulation for the optimized model was conducted under A grade and F grade road surface conditions, the simulation results showed that the total weighted RMS acceleration value was reduced to0.684m/s2and1.263m/s2, the riding comfort was improved.