Method for selecting the damping characteristics of the pneumohydraulic suspension system of a wheeled vehicle

BACKGROUND: In the process of developing suspension systems for modern high-speed wheeled and tracked vehicles, having the selected optimal elastic characteristic curve of the suspension system, its unsatisfactory damping characteristic curve can have a significant negative impact on the overall operation of the suspension unit. Therefore, the search for a method for obtaining the optimal damping characteristic curve is a relevant task.

AIMS: Description the method for selecting the damping characteristic curve of a single-level pneumohydraulic spring for a wheeled vehicle considering the motion along tracks with a harmonic profile and a rough cobblestone road.

METHODS: The damping characteristic curve of the spring is selected using simulation mathematical modeling in the MATLAB/Simulink software, which makes it possible to take into account the nonlinearity of the suspension characteristics. In the process of building the characteristic curve, the limit values of the forces at the front wheels tires are fixed for the sections of the characteristic curve that operate with the valves of the pneumohydraulic spring turned off. Accelerations at the driver's seat and the pressure in the spring chamber are fixed for the sections of the characteristic curve that operate with the valves are turned on.

RESULTS: The results of the selection of an optimized damping characteristic curve showed an improved contact of the wheels with the surface and an increase in the stability of the vehicle, a decrease in vibration accelerations at low disturbance frequencies.

CONCLUSIONS: The practical value of the study lies in the possibility of using this method to develop suspension systems for new wheeled and tracked vehicles.