Investigation of movement of the off-road vehicles under roadless conditions

The popularity of hybrid power trains has been increasing in off-road vehicles in the recent years. These vehicles operate under difficult road conditions. The aim of the reported work is to define the influence of hybrid power train during movement under difficult conditions

Dynamic processes of a vehicle moving over step – shaped obstacles

The study presents the development and analysis of a dynamic model, which simulates the loads induced on a tire of a vehicle as well as its suspension elements including their deformations when passing over a step-shaped obstacle. The possibilities of application of the quarter- and half-car models are considered. The models are used to analyze the influence of vehicle mass and suspension parameters on dynamic loads with the aim to provide recommendations and requirements for the development of active suspensions enabling to reduce dynamic loads generated when crossing over the considered obstacles

Coupling of energy flows from internal combustion engine and electrical motor in hybrid vehicle

Dynamical model of the hybrid electrical vehicle transmission with internal combustion engine and electrical motor driving the rear and the front wheels accordingly is developed. Particular elements in it are described using classical transmission elements. The model is used for the analysis of acceleration process when the engine and motor operate in non stationary regimes and transmission elements are in transition regimes of motion. Non linear models for clutch and wheel-road interaction description are used. The gear box control algorithm was developed and the vehicle prototype was constructed and tested. The experimental results proved the model validity. The difference in numerical and experimental results for the acceleration at 400 m. distance does not exceed 10 %. The model could be the background for the simplified control algorithm development with no mechanical link between the transmissions. Numerical modeling and experimental research show the functionality of the algorithm. The performed numerical modeling revealed that different from commonly used criteria for velocity ratios selection in the gear box are necessar

Evaluation of the strength anisotropy for railway wheels

The results of experimental investigation of railway wheel failures and strength anisotropy due to rolling contact fatigue are presented. The results indicate that plasticity acts to concentrate regions of intense hardening near the edges of contact. The determination of overall mechanical properties of small-scale volumes frequently relies on the indentation technique. Strength characteristics of the wheel material were investigated by dynamic indentation method and portable dynamic indentation tester was used for hardness measurements. It was found that some characteristic force values of the instrumented hardness test are very well correlated to tensile strengt

Investigation of movement of the off-road vehicles under roadless conditions

The popularity of hybrid power trains has been increasing in off-road vehicles in the recent years. These vehicles operate under difficult road conditions. The aim of the reported work is to define the influence of hybrid power train during movement under difficult conditions

Evaluation of the strength anisotropy for railway wheels

The results of experimental investigation of railway wheel failures and strength anisotropy due to rolling contact fatigue are presented. The results indicate that plasticity acts to concentrate regions of intense hardening near the edges of contact. The determination of overall mechanical properties of small-scale volumes frequently relies on the indentation technique. Strength characteristics of the wheel material were investigated by dynamic indentation method and portable dynamic indentation tester was used for hardness measurements. It was found that some characteristic force values of the instrumented hardness test are very well correlated to tensile strengt

Investigation of movement of the off-road vehicles under roadless conditions

The popularity of hybrid power trains has been increasing in off-road vehicles in the recent years. These vehicles operate under difficult road conditions. The aim of the reported work is to define the influence of hybrid power train during movement under difficult conditions

Coupling of energy flows from internal combustion engine and electrical motor in hybrid vehicle

Dynamical model of the hybrid electrical vehicle transmission with internal combustion engine and electrical motor driving the rear and the front wheels accordingly is developed. Particular elements in it are described using classical transmission elements. The model is used for the analysis of acceleration process when the engine and motor operate in non stationary regimes and transmission elements are in transition regimes of motion. Non linear models for clutch and wheel-road interaction description are used. The gear box control algorithm was developed and the vehicle prototype was constructed and tested. The experimental results proved the model validity. The difference in numerical and experimental results for the acceleration at 400 m. distance does not exceed 10 %. The model could be the background for the simplified control algorithm development with no mechanical link between the transmissions. Numerical modeling and experimental research show the functionality of the algorithm. The performed numerical modeling revealed that different from commonly used criteria for velocity ratios selection in the gear box are necessar

Evaluation of the strength anisotropy for railway wheels

The results of experimental investigation of railway wheel failures and strength anisotropy due to rolling contact fatigue are presented. The results indicate that plasticity acts to concentrate regions of intense hardening near the edges of contact. The determination of overall mechanical properties of small-scale volumes frequently relies on the indentation technique. Strength characteristics of the wheel material were investigated by dynamic indentation method and portable dynamic indentation tester was used for hardness measurements. It was found that some characteristic force values of the instrumented hardness test are very well correlated to tensile strengt

Coupling of energy flows from internal combustion engine and electrical motor in hybrid vehicle

Dynamical model of the hybrid electrical vehicle transmission with internal combustion engine and electrical motor driving the rear and the front wheels accordingly is developed. Particular elements in it are described using classical transmission elements. The model is used for the analysis of acceleration process when the engine and motor operate in non stationary regimes and transmission elements are in transition regimes of motion. Non linear models for clutch and wheel-road interaction description are used. The gear box control algorithm was developed and the vehicle prototype was constructed and tested. The experimental results proved the model validity. The difference in numerical and experimental results for the acceleration at 400 m. distance does not exceed 10 %. The model could be the background for the simplified control algorithm development with no mechanical link between the transmissions. Numerical modeling and experimental research show the functionality of the algorithm. The performed numerical modeling revealed that different from commonly used criteria for velocity ratios selection in the gear box are necessar