Vojnotehnicki glasnik / Military Technical Courier

261-271

Authors: Stanojević Petar, Mišković Vasilije

(not available in English) Kreirana metodologija može se koristiti u rešavanju problema projektovanja - reprojektovanja logističkih i sličnih OTS kod kojih je ubrzavanje informacionih i drugih tokova kljucni faktor uspeha [9]. Rezultati dobijeni korišćenjem ove metodologije pri rešavanju problema u praksi dali su zadovoljavajuće rezultate [17]. Ciljevi koji se mogu postići primenom ove metodologije su: povećanje efikasnosti i efektivnosti izvršenja usluge održavanja; veća raspoloživost proizvoda koji su potrebni korisniku; povećanje odgovornosti prema zahtevima korisnika; povećanje kvaliteta i pouzdanosti usluge (nije direktno već indirektno merljivo) i smanjenje troškova poslovanja. Celokupna metodologija zasnovana je na permanentnom traženju racionalnijih rešenja kojima se procesi pojednostavljuju i ubrzavaju. To preferira rešenja sa većom integracijom medu sličnim i zavisnim procesima, jer se kroz postupke kvantifikacije pokazalo da su takva rešenja principijelno uspešnija. Integracija informacionih tokova i delova sistema zahtevaće, verovatno, i promene u ponašanju zaposlenih i stvaranje partnerskih odnosa sa internim i eksternim okruženjem. Dobre rezultate može doneti podizanje mesta u hijerarhiji OTS namenjenog za šefa logističke funkcije (i SOd-a) i njegovo izjednačavanje po značaju sa funkcijama osnovnih delatnosti i razvoja, jer se time odnosi pretvaraju u partnerske, naglašava se značaj pravilne eksploatacije TS i korišćenja drugih materijalnih sredstava, a procesi, pogotovo razvojni ubrzavaju, jer se smanjuje obim potrebne koordinacije. Doseg primene ove metodologije na celinu SOd-a, logističkog ili sličnih OTS može se prikazati okvirom C na slici 2 (prikazana u I delu rada). Primenom ove metodologije ne mogu se reSiti svi problemi koje nameću starost organizacije ili vlasnički odnosi i odnosi moci u OTS. Takođe, ova metodologija se uz poteškoće može primeniti na projektovanje organizacija u kojima su osnovni procesi dugoročnog karaktera (npr. razvojno-istraživačke), jer se usredsređuje na osnovne materijalne i informacione tokove u sistemu od kojih zavisi efikasno i brzo pretvaranje inputa u output, kao i na uzimanje u obzir uticaja ostalih situacionih faktora.

283-294

Authors: Čabarkapa Obrad

The one-factor experiment design has been applied in the analysis of all input parameters occurring in the two phase flow process in automatic rifle barrels. The parameters predominantly influencing input characteristics have been chosen afterwards. A complete factor experiment plan is given for 24 chosen parameters, with the analysis of each particular parameter as well as of their effects on output characteristics. Parameter effects are ranked regression polynomials with regression coefficients are determined and average value deviation limits are given by dispersion and regression analyses. The complete analysis is carried out for the maximum pressure of powder gases and the muzzle velocity as two significant output characteristics of all arms. Based on calculation results, tabular and graphical 3D presentation of flow parameters is given as a function of projectile time and trajectory.

305-313

Authors: Pantić Mladen

The definition, classification and designation of elements of planetary gear trains were carried out and their basic characteristics were given in the paper the bases of kinematics of planetary gear trains were presented and possibilities of lock-up modes were analyzed from the special aspect of power circulation. The analysis of basic parameters of planetary gearboxes of some contemporary high speed tracked vehicles was performed and the kinematics schemes of gearboxes were shown. The basic elements of methodology for the creation of optimal kinematics scheme of compound planetary gear trains were described and the obtained optimal solution of the kinematic scheme was analyzed.

328-339

Authors: Lukić Tomislav

Conversion of laser radiation energy into radiated sample heat is the essence of laser application for metal processing. Energy and space-time characteristics of laser beam as well as material properties affect significantly processing results. Applying certain simplifications as well as classical methods, predominantly theories of thermal conductivity electrodynamics and fluid dynamics, there is a relatively easy way to acquire simple formulae for fast engineering calculations and estimations. On the basis of thus obtained conclusions, this paper points out some characteristics of laser radiation interaction with materials, typical for most common application areas such as heat treatment, cutting, drilling welding, marking, etc.