No abstract

The paper is concerned with basic mechanical properties directly affecting ballistic resistance in relation to the ambient temperature changes. Possible decrease in the material ballistic resistance may eventually lead to the increase in logistic processes-related expenditures, e.g. when acquiring property and services upon combat damage to the military vehicle material. In the experiment, a critical ambient temperature was determined, at which degradation processes, considerably decreasing the ballistic resistance of the material tested, are highly probable to occur. The experiment was supplemented with a chemical analysis using EDS and transmission electron microscopy of selected specimens, where modifications in measured material characteristics were detected, which are influencing the live cycle of the material.

The Czech Republic, as a member of international organizations (NATO, EU, UNO), with respect to current global security neighborhood, employs the units of the army both at its own state territory and outside the Czech Republic, in multinational forces operations. The article focuses on Linear and Angular issues in perspective Artillery Fire Control System called PVNPG-14M. The issue of automated command, control, and information systems is of high importance in the solving of asymmetrical operations tasks today and in the upcoming future. The authors define appropriate Linear and Angular variables for common use by soldiers of the Army of the Czech Republic. Final assessment of the particular issues is determined by analysis. The The article contains theoretical justification and establishes a practical rule for use.

This article examines autonomous reconnaissance in a complex urban environment using unmanned aerial vehicles (UAVs). Environments with many buildings and other types of obstacles and/or an uneven terrain are harder to be explored as occlusion of objects of interest may often occur. First, in this article, the problem of autonomous reconnaissance in a complex urban environment via a swarm of UAVs is formulated. Then, the algorithm based on the metaheuristic approach is proposed for a solution. This solution lies in deploying a number of waypoints in the area of interest to be explored, from which the monitoring is performed, and planning the routes for available UAVs among these waypoints so that the monitored area is as large as possible and the operation as short as possible. In the last part of this article, two types of main experiments based on computer simulations are designed to verify the proposed algorithms. The first type focuses on comparing the results achieved on the benchmark instances with the optimal solutions. The second one presents and discusses the results obtained from a number of scenarios, which are based on typical reconnaissance operations in real environments.

Mechanical components in military vehicles, such as shafts, gears, stubs, forming groups and subgroups, are exposed to extreme service load while in operation in consequence of the environment. Within NATO, the Armed Forces of the Czech Republic deploy military vehicles in demanding mountainous terrain (e.g. in Afghanistan), or in the past, in areas with high dustiness and relative humidity (e.g. in Iraq), which results in shortening of the life cycles of these components and the increase in the financial means expended on the recovery of the vehicles operability. This paper is concerned with proposing a heat treatment of the material of military vehicles components that is supposed to extend the material service life and enhance the corrosion resistance. The experiment is complemented with a tensile test and chemical composition, microhardness and microstructure analyses.