Proposal of unmanned ground vehicle powered by fuel cell

The presented article deals with the design of an unmanned ground vehicle (UGV) with electric drive, using a fuel cell as a source of electricity. The introduction describes the principle of the fuel cell, followed by the design of the UGV propulsion system. The UGV design, taking into account specific technical parameters, is processed into a model in the simulation environment MATLAB / Simulink / Simscape. Simulation results are presented in graphical form of selected physical quantities over time.

Performance characteristics of steel 1.2842 after nitridation

The paper deals with the change in mechanical properties and wear of 1.2842 universal tool steel after plasma nitriding, which is widely used to produce cutting tools with good durability and low operating costs. Plasma nitriding was performed at a temperature of 500 °C for 10-hour period in a standard N2 /H2 atmosphere with 1:3 gases ratio. Microstructure, phase structure, thickness of a nitriding layer and surface roughness of samples were measured with optical microscopes and a profilometer. Verification of a chemical composition was carried out on the BAS TASMAN Q4 device. Wear resistance was measured on a universal TRIBOLAB UTM 3 tribometer, through a, “pin on disc“ method. The results of experiments have shown that plasma nitriding process, significantly improves the mechanical and tribological properties of selected materials.

Experimental determination of continuous cooling transformation diagram for high strength steel X153CrMoV12

The article is a continuation of the article ,DILATOMETRIC ANALYSIS OF COOLING CURVES FOR HIGH STRENGTH STEEL X153CrMoV12”, which deals with the phase transformations of tool steel X153CrMoV12. The experimental data obtained was used to evaluate the resulting CCT diagram, which consists of seven dilation curves. All experimental samples from dilatometric analyses were then subjected to microstructural analysis and hardness measurements to characterize the microstructure and hardness for each heat treatment mode tested. AFM microscopy was also used to study the carbides present in steels and their size and shape for all selected cooling modes.

Analysis of Current Trends in the Development of DSLs and the Possibility of Using them in the Field of Information Security

Use of an appropriate DSL can significantly reduce development time. This is due to the fact that DSLs are limited to the use of terms relating to the explicit domain, which makes them much easier for programmers to understand and learn. Despite these and other advantages of DSLs over GPLs, programmers will only exceptionally turn to DSLs in development process. Therefore, in this article, we will look closer on what DSLs are, when it is appropriate to use them in a project and when not. In the last part of this article, we will focus on the possibilities of using DSLs in the field of information security.

The role and the risks of explosive ordnance decontamination in Hungary

The work of the experts of explosive ordnance disposal is very demanding in Hungary. Thousands of explosive remnants of war are still waiting for disarming in the soil. This public duty demands highly trained professionals who are able to meet the requirements of this lethal profession. The statistics are important to receive a complete picture about the background of projectiles and bombs. These military ordnances endanger everybody’s live in their close distance. To understand the features of these dangerous devices, first the threats hidden inside their main parts must be identified. This may help us to make the explosive ordnance disposal tasks safer and to understand the possibilities during render safe procedures.

Stress prediction analysis during hot working of 100MnCrW4 steel

This paper deals with the analysis and the possibility of using a constitutive model based on the Arrhenius equationfor tool steel 100MnCrW4. Experimental measurements were performed on a DIL 805 dilatometer in the range of strain rate 0.001 s-1 for 10 s -1 and temperature from 800 to 1200 °C. Using constitutive equations, material parameters and activation energy were derived, which can be subsequently applied to other models selated to hot behavior of deformation. The experimental data were compared to the ones obtained by the predictive model with the correlation coefficient R = 0.97885 and the parameter MAPE = 17.28 % which means a very good level of prediction.

Tribodiagnostic Control of Motor Oil (MO) Properties in IVECO Crossway Buses

Within the Project VV1 "Design and application of tribodiagnostic methodologies for operation and maintenance of ground equipment of the Armed Forces of the Slovak Republic in the years 2018 - 2020, she was performed motor oil (MO) sampling series and property measurement series (MO) PETRONAS URANIA FE LS, SAE 5W-30, (O-1178), in IVECO CROSSWAY vehicles. The aim was to perform on the basis of the performed experimental measurements experimental verification of parameters of operating substances and materials of newly introduced ground military equipment.

Active Thermografy as a Method for Non-destructive Testing of Polymer Composite Materials

Infrared (IR) thermography is a method for imaging thermal fields on the target surfaces in real time. It is a noncontact and non-destructive method of obtaining thermogram of tested material surface or inside of it. We can divide the IR thermographic testing methods into two basic groups – passive and active thermography. This article introduces a basic overview of IR active thermography.

Dilatometric analysis tool steel X153CrMoV12

The article deals with phase transformations and austenitizing behavior of the X155CrMoV12 tool steel. Dilatation analyses of a series of samples were performed at various cooling rates, chosen in the range from 10 °C·s-1 to 0.1 °C·s-1. Acquired experimental data were used for evaluation of dilatometric curves in order to map the temperature ranges of phase transformations of the austenite to pearlite, bainite or martensite. All experimental samples from dilatometric analyses were then subjected to microstructural analyses and hardness measurements to characterize the microstructure and hardness for every tested heat treatment regime. The second part of this article, entitled "EXPERIMENTAL DETERMINATION OF CONTINUOUS COOLING TRANSFORMATION DIAGRAM FOR HIGH STRENGTH STEEL X153CRMOV12", deals with these analyses of the cooling curve microstructure.

Strength Calculation of UAV‘s Wing Connector Tube

The use of unmanned vehicles - both civilian and military - is clearly a technological trend today. It is reasonable to assume that this trend will continue in the future. Especially in the military field, an unmanned vehicle can be considered a benefit, especially in applications where the use of "standard" equipment is difficult or impossible. This is especially true of Unmanned Aerial Vehicle (UAV). The flight itself represents a number of different types of stress affecting the design of the unmanned aircraft. Therefore, the design of such a device must be subjected in the first step to a computational strength analysis and subsequently to a real stress test. Our paper deals with the strength analysis of the most exposed structural element - the wing connector. Proper sizing of the wing connector is therefore crucial for the successful operation of the UAV.