Research the influence of road surface conditions on vibration and safety of Semi Trailer vehicle dynamics

Purpose: Depending on the road surface profile, moving speed, transport weight, etc., the vehicle's body acceleration and dynamic load coefficient change as it moves. This study's goal is to ascertain the result of the road surface's influence on the vehicle, calculate the average vehicle body displacement acceleration and dynamic load coefficient, and validate your findings through testing. To confirm the simulation model's accuracy, experimental and theoretical simulation results are compared.. Methods: The Neuton-Euler approach and the multi-body system structure separation method are used in the paper to create dynamic equations using theoretical research methods [1]. Simulations are carried out using Matlab Simulink software to examine and assess the dynamics. Results: According to ISO 8608:2016 standard [2], theoretical research results have determined the average acceleration of the vehicle body, dynamic load coefficient, horizontal sway angle, and longitudinal sway angle when the vehicle moves on profiles C, D , E, F. Experiments show that there is an error of 7.4% and 8.1% when measuring the average acceleration and dynamic load coefficient k{\dj}max when the vehicle moves at a speed of 50 km/h on the road surface C compared to theory.