Analiza utjecaja nesigurnosti procjene aerodinamičkih koeficijenata na padne točke topničkog projektila

undergraduate thesis

• Title (english): Analysis of uncertainty influence of aerodynamic coefficients estimation on artillery projectile impact points
• Author: Anđelko Potrebica
• Mentor: Milan Vrdoljak (mentor)
• Mentor: Zvonko Trzun (komentor)
• Committee member: Matija Hoić (predsjednik povjerenstva)
• Committee member: Milan Vrdoljak (član povjerenstva)
• Committee member: Goran Šagi (član povjerenstva)
• Granter: University of Zagreb; (Croatian Defence Academy "Dr. Franjo Tuđman"); Zagreb
• Defense date and country: 2024-09-10, Croatia
• Scientific / art field, discipline and subdiscipline: SOCIAL SCIENCES; Security and Defense Science
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Aviation, Rocket and Space Technology

Abstract

Cilj ovog rada je analizirati utjecaj rasipanja aerodinamičkih koeficijenta na padne točke. Simulacije koje prikazuju rasipanje padne točke topničkog projektila vršile su se u programu Matlab. Topnički projektil koji je korišten u simulacijama je projektil sličan projektilu TF-462. Kao početni korak odabrani su aerodinamički koeficijenti koji će se promatrati u simulaciji a, to su: Cmσ, CLσ i CD. U sljedećem koraku procijenjeno je njihovo rasipanje na temelju iskustva. Nakon definiranja početnih uvjeta simulacije definirane su slučajne vrijednosti promatranih aerodinamičkih koeficijenata kao funkcije Machovog broja. Tako je omogućeno zasebno razmatranje utjecaja rasipanja odabranog aerodinamičkog koeficijenta, ali je omogućeno i razmatranje Monte-Carlo simulacije analiziranjem različitih kombinacija rasipanih aerodinamičkih koeficijenata. Ta opcija nam dopušta da koristimo Monte-Carlo metodu te nam dopušta da analiziramo različite kombinacije kod kojih se aerodinamički koeficijenti rasipaju ili ne. Pomoću dobivenih rezultata izračunate su: standardne devijacije, očekivane vrijednosti po pravcu i dometu i CEP za sve analize. Dobiveni rezultati prikazani su dijagramima te su komentirani odgovarajući zaključci.

Abstract (english)

The aim of this paper is to analyze the influence of the dispersion of aerodynamic coefficients on the drop points. The simulations showing the dispersion of the artillery projectile drop point were performed in the Matlab program. The artillery projectile used in the simulations is a projectile similar to the TF-462 projectile. As an initial step, the aerodynamic coefficients that will be observed in the simulation were selected, namely: Cmσ, CLσ i CD. In the next step, their dissipation was estimated based on experience. After defining the initial conditions of the simulation, the random values of the observed aerodynamic coefficients were defined as a function of the Mach number. Thus, it is possible to separately consider the influence of the spread of the selected aerodynamic coefficient, but it is also possible to consider the Monte-Carlo simulation by analyzing different combinations of the spread aerodynamic coefficients. This option allows us to use the Monte-Carlo method and allows us to analyze different combinations where the aerodynamic coefficients dissipate or not. Using the obtained results, the following were calculated: standard deviations, expected values per direction and range and CEP for all analyses. The obtained results are presented in diagrams and the corresponding conclusions are commented.

• Keywords: MPMM; aerodinamički gradijenti; Monte-Carlo metoda; topnički projektil; očekivana pogreška; CEP
• Keywords (english): MPMM; aerodynamic gradients; Monte-Carlo method; artillery projectile; expected error; CEP
• Language: croatian
• URN:NBN: urn:nbn:hr:249:137093
• Study programme: Title: Military Engineering; Study programme type: university; Study level: undergraduate; Academic / professional title: sveučilišni/a prvostupnik/ prvostupnica inženjer/inženjerka vojnog inženjerstva (sveučilišni/a prvostupnik/ prvostupnica inženjer/inženjerka vojnog inženjerstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Closed access
• Created on: 2024-10-23 14:36:51