Simulation of passenger movement dynamics in a vehicle

Abstract

A feature of the braking dynamics of a road train is the occurrence of shock loads between its links, which under certain conditions can significantly impair its stability. At the same time, there is a significant increase in dynamic loads on the support-coupling device, the destruction of which can lead to an emergency situation. It is suggested to use computer modeling in addition to bench tests to diagnose the condition of traction and coupling devices. It makes it possible not only to duplicate field tests, but also to reduce their costs, to apply methods of theoretical forecasting and determination of the strength of units of traction and coupling devices of trailers and towed vehicles. In the case of a semi-trailer, the impact of the tractor is modeled taking into account the initial lateral stiffness of the pivot pin, which indicates the elasticity of the suspension, tires, chassis and support-coupling device of the tractor-trailer on the level of the ground surface. The load on the finger of the hinged-coupling device during computer modeling was estimated by the amount of stress concentration on the surface of the finger. The greatest local stresses were observed in the area of the finger's phalanx, and the maximum deformation of the finger did not exceed 0.061 mm. Bench tests with the same tensile test force as in the calculation method showed that the difference in the values obtained by these two methods was 10-3 mm, which is included in the permissible measurement error (± 1.6•10-3 mm). The combination of bench tests and computer modeling is also relevant at the design and testing stages of agricultural, forestry and special purpose vehicles and machines.