Effect of Suspension System Stiffness on Dynamic Load Three Axle Vehicle

3-axle trucks play an important role in the freight transport network in Vietnam due to their high transport capacity. In the working process, Dynamic loads greatly affect the axle house, road, and vehicle dynamic safety. This paper presents the survey results on the influence of suspension system stiffness on the dynamic load of a 3-axle truck when the vehicle goes through a random bumpy road according to ISO 8608:2016 standard. The purpose of the study is to build and simulate the vehicle’s dynamics model to determine the dynamic load acting on the road. A dynamic model of a 3-axle truck is simulated using Matlab/Simulink. Dynamic loads generated by the excitation from the road surface bump to the wheels through the suspension. The model is applied to study the vibration and noise and analyze the structural durability of vehicles.