SCIDAR - A Digital Archive of the University of Kragujevac

The increment of the people mobility makes vehicles an unavoidable part of everyday life. Due to the vehicle drive, vehicle speed adjustment to the road conditions, comes to the formation of the non-exhaust particles. Particles which form due to the wear of tires and wear of brakes are very harmful for the people health, as well as for the environment. The size of particles can go from 0.1 µm to 10 µm, and as smaller is the aerodynamic diameter of particle, the more dangerous is for the peopl...

In order to determine the best injection parameters for hydrogen, an experimental work was performed. The test engine was equipped with the installation for the hydrogen supply, and it was tested how the injection timing and number of injection influence on the performances of the IC engine. As the control parameters were taken the indicating power as well as the indicating work of the engine. It was determined that the injection parameters, significantly influence on the engine working cycle...

The gas fuels are from many aspects more convenient for use than a liquid fuels. First of all, the gas fuels are already in gaseous aggregate state, so in is not necessary the vaporization, the mixing is easier, and by that the formation of homogenous mixture is much easier, than in the case of liquid fuels. Also, the gas fuels are considered as more perspective fuels, due their chemical composition. In most cases, the gas fuels have less carbon in their chemical composition, which is good fr...

In order for the experimental work to be successful, it is necessary a serious preparation, as well as time for experimental work execution. Also, experimental work is usually demands high costs for equipment, materials and engaged people. However, one is for sure, the experimental work cannot be replaced, but the numerical approach can be a good tool, at least for the first stages of the product development, in order to reduce the experimental work costs. In the paper was performed numerical...

The ecology is one of the most important subjects during the past years. The IC engines are usually considered as main culprits for the environmental pollution. Because of this, the automotive engineers are looking for the adequate alternative. Mostly are considering electric vehicles. However, the electric vehicles are just emission dislocation, and not it removal. The best possible solution are maybe hybrid vehicles. However, this vehicles are also having IC engines, so maybe a good option ...

The two most common methods for solving contact problems using the finite element method are the Lagrange multiplier method and the penalty method. The Lagrange multiplier method treats contact forces as independent variables (Lagrange multipliers), and the contact non-penetration conditions are exactly satisfied. The penalty method satisfies contact conditions using penalty parameters, and the contact non-penetration conditions are approximately satisfied. The aim of this study is a co...

Road transport is one of the most dangerous methods of goods transport. Driver errors and poor traffic conditions can cause traffic accidents, which can have a negative impact on people’s health, the environment, and infrastructure. The main influence on the level of the consequences is the chemical composition and amount of the transported substance. This paper presents the causes of traffic accidents during the transport of dangerous goods. In addition, how traffic accidents during the tran...

Brakes are one of the basic safety systems on a vehicle. During the operation of the vehicle, the brakes allow the vehicle to slow down, i.e., to adapt to traffic conditions or to stop, if necessary. However, in all conditions mentioned, emissions of brake wear products occur, which are very harmful to the environment because they can contain heavy metals. Working parameters of braking process are responsible for the intensity of brake wear, which can be tested in laboratory or road condition...

Braking system is one part of the equation that leads to the desired deceleration of the vehicle. Vehicle dynamics are equally important and should optimize to achieve maximum deceleration of the vehicle. Whether the driver brakes and stops the vehicle in an emergency, it must be able to stop safely. This means that he does not harm himself or other traffic participants. Velocity makes braking more difficult because higher velocities require higher braking forces. When they are moving at high...