Vojnotehnicki glasnik / Military Technical Courier

555-570

Authors: Debeljković Dragutin Lj., Jovanović Mića B., Milinković Stevan A.

Singular systems are those the dynamics of which is governed by a mixture Of algebraic and differential equations. In that sense the algebraic equations represent the constraints to the solution of the differential part. These systems are also known as descriptor, semi-state and generalized systems. They appear as a linear approximation of systems models, or linear system models in many applications such as electrical networks, aircraft dynamics, neutral delay systems, large-scale systems, interconnected systems economics, optimization problems, feedback systems, robotics, etc. The basic dynamic analysis in time domain is devoted to the question of stability in the sense of Lyapunov as well as in the sense of finite time stability. Besides that, it is of particular interest to maintain the systems characteristics under the action of undesirable perturbations. This question is in the connection with the problems treated well by the modern concept of stability robustness within the area of control engineering.

580-594

Authors: Ristić Zoran, Ilić Slobodan, Davidović Mile

A numerical solution of a model for the hydraulic recoil brake in the artillery weapon is presented. A program solution and an algorithm for the identification of dynamic recoil brake parameters and the recoil process simulation have been worked out in the procedure of numerical modeling. The analysis of the influence of hydraulic brake input parameters on the level of estimated parameters has been performed as well as the optimization of estimated parameters to according to defined limitations.

612-621

Authors: Građin Zoran B.

Influences of up-to-date design trends and ecology requirements on working conditions of actual lubricants in internal combustion engines were considered in the paper. Designs with reduced dimensions and designs with high thermal and mechanical efficiency are favourised in IC engine development. The increase of diesel engine break power for commercial trucks is continuing. At the same time, requirements for further increase of reliability and lifetime are established. Additionally, demands for further emission reduction require low oil consumption (0,5 g/kWh and lower), even for charging diesel engines. All this implies that very high thermal loads can be expected. The trend of the lubricant use decrease appeared in developed countries in the early 1990s. This is not surprising, because the ecotoxicological impact of lubricants became a big problem. Thus, an intensive research for new principles of lubrication, based on new lubricants and new friction materials, is in progress.

638-650

Authors: Brčić Krsta

The topic of this paper is using the programmable logic controller (PLC) connected with a PC in order to control equipment in training areas. PLCs are typically designed to withstand high amounts of impact and vibration in industry. Personal computer technology is an extraordinary powerful platform for innovators in finding the solution to the problem of automatic control. Such systems can provide economical full featured monitoring and control solution. In order to explain the problem, we will show one example of a target control system in an infantry training area.