• ## SCHEMATISATION THE STUDY PROCESS OF MULTIBODY ROAD VEHICLE MODELS DESCRIBING RIDE COMFORT – PART II. METHODS OF MATRIX MECHANICS

The objective of this study is investigation possibilities to obtain main parameters of road vehicle ride comfort using formal matrix approach. The automobile is modeled as a dynamic system consist masses interconnected by springs and dampers with linear characteristics. The procedure is applied about four to eight wheel models. The engine, transmission, passengers and loads are presented like a simple masses suspended on a single springs. In the paper are written the main principles of calculation procedure for formal modeling typical vehicle dynamic system.

• ## SCHEMATISATION THE STUDY PROCESS OF MULTIBODY ROAD VEHICLE MODELS DESCRIBING RIDE COMFORT – PART I. METHODS OF CLASSICAL MECHANICS

The objective of this study is investigation possibilities to obtain main parameters of road vehicle ride comfort using formal matrix approach. The automobile is modeled as a dynamic system made of masses interconnected by springs and dampers with linear characteristics. The procedure is applied about four to eight wheel models. The engine, transmission, passengers and loads are presented like a simple masses suspended on a single springs. In the paper are written the main principles of calculation procedure for formal modeling typical vehicle dynamic system.

• ## INVESTIGATION MODELS FOR VEHICLE DIRECTIONAL STABILITY- II part

The paper presents a plane mathematical model of two degrees of freedom for vehicle directional stability. This model includes the lateral and yaw motions of the vehicle body. As a result, the model can be used for the analysis of the tire lateral stiffness and tire slip angle on vehicle directional stability. The behavior of vehicle stability has been simulated with MATLAB software. The results give the possibility to investigate the vehicle directional stability and the laterals dynamics process.

• ## INVESTIGATION MODELS FOR VEHICLE DIRECTIONAL STABILITY- I part

The vehicle directional stability depends on various factors, such as tire construction, their lateral stiffness, the rapport HL, the pressure and etc. The study presents a research of the influence of lateral stiffness of the suspension system and tire on vehicle stability.
Three types of vehicle models were used by considering the degrees of freedom. The lateral tire-road forces are modeled using Pacejka’s magic formula. The behavior of car stability has been simulated with MATLAB software. The results give the possibility to investigate the vehicle directional stability and the laterals dynamics process.

• ## ABOUT THE RESEARCHING TRAFFIC INTENSITY OF CROSSROAD KOSTA AVRAMIKOV STREET AND RODOPI STREET IN THE TOWN OF SMOLIAN

This article renders the results from researching the traffic intensity of the vehicles and the pedestrians through the crossroad in the town of Smolian, direction Kosta Avramikov str – Rodopi str and vice versa.