Analiza slijetanja svemirske letjelice s ljudskom posadnom po povratku iz orbite

undergraduate thesis

• Title (english): Analysis of crewed spaceplane landing after re-entry from orbit
• Author: Lora Hadviger
• Mentor: Milan Vrdoljak (mentor)
• Granter: University of Zagreb; Faculty of Mechanical Engineering and Naval Architecture; Zagreb
• Defense date and country: 2024-02-29, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Aviation, Rocket and Space Technology

Abstract

Zadatak je rada analiza slijetanja svermirske letjelice HL-20 s konfiguracijom nosećeg tijela po povratku iz orbite. Aerodinamički koeficijenti letjelice oblikovani su prema podacima izmjerenim za model letjelice u zračnom tunelu te su modelirani kao funkcije napadnog kuta i kuta klizanja metodom „nadogradnje“ koeficijenata (engl. Coefficient build-up method) te su nadograđeni inkrementalnim koeficijentima koji predstavljaju utjecaj položaja kontrolnih površina (zakrilca i kormilo visine), podvozja i utjecaja tla. Prema dobivenim aerodinamičkim koeficijentima, dimenzijama i zadanim parametrima letjelice prilagođen je model slijetanja materijalne točke u programskom jeziku MATLAB. U MATLAB-u je potom provedena analiza slijetanja prilagođenog modela. Analiza je provedena za četiri faze slijetanja letjelice. Analizirane su promjene visine, kuta propinjanja i brzine letjelice u ovisnosti o vremenu i koordinati x, te promjene napadnog kuta, otklona visine kormila, kutne brzine, normalnog opterećenja i koeficijenata 𝐶𝐿, 𝐶𝐷, 𝐶𝑍, 𝐶𝑋 i 𝐶𝑚 u ovisnosti o vremenu.

Abstract (english)

purpose of this paper is to analyze the landing of the HL-20 lifting-body spacecraft upon it's return from the orbit. The aerodynamic coefficients of the spacecraft are formed based on data measured for a model of the spacecraft in a wind tunnel and are modeled as functions of angle of attack and sideslip angle using the coefficient build-up method. Incremental coefficients representing the influence of control surface positions (flaps and elevator), landing gear, and ground effect are then added. Based on the obtained aerodynamic coefficients, dimensions and specified parameters of the spacecraft, a material point landing model was adapted using the MATLAB programming language. Subsequently, an analysis of the adapted model's landing was performed in MATLAB. The analysis was carried out for four phases of the spacecraft's landing. Changes in altitude, pitch angle, and spacecraft velocity were analyzed with respect to time and x-coordinate, as well as changes in angle of attack, elevator deflection, angular velocity, normal load factor, and coefficients 𝐶𝐿, 𝐶𝐷, 𝐶𝑍, 𝐶𝑋 i 𝐶𝑚 with respect to time.

• Keywords: slijetanje; svemirska letjelica HL-20; aerodinamički koeficijenti; kontrolne površine; podvozje; utjecaj tla; model slijetanja materijalne točke
• Keywords (english): landing; HL-20 spacecraft; aerodynamic coefficients; control surfaces; landing gear; ground effect; material point landing model
• Language: croatian
• URN:NBN: urn:nbn:hr:235:233139
• Study programme: Title: Aeronautical Studies; Study programme type: university; Study level: undergraduate; Academic / professional title: sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka zrakoplovnog inženjerstva (sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka zrakoplovnog inženjerstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2024-03-01 12:55:55