Analiza ravnotežnog atmosferskog leta raketoplana s ljudskom posadom u fazi spuštanja i prilaza slijetanju

undergraduate thesis

• Title (english): Analysis of trimmed atmospheric flight for crewed spacecraft in descent and landing approach phase
• Author: Roko Jokić
• 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; Aircraft Construction and Design

Abstract

U ovom radu odrađena je analiza ravnotežnog atmosferskog leta svemirske letjelice Raketoplan slične konceptualnoj letjelici HL-20 koju je NASA istraživala tijekom 1980-ih i 1990-ih godina. Letjelica koristi koncept nosećeg tijela (eng. lifting-body), gdje je sami trup aviona aerodinamički napravljen tako da sam proizvodi uzgon, šta joj omogućava da ne mora imati velika krila. Konkretno analiza proučava ravnotežno spuštanje i prilaz slijetanju, te je podjeljena u te dvije faze. Aerodinamički koeficijenti korišteni u analizi su dobiveni testiranjem modela u dva različita Američka aerotunela te su objavljeni od strane NASA-e. Visine i profil brzine odabrani su kako bi najsličnije odgovarali misiji koju bi letjelica odrađivala u stvarnosti. U obzir je uzet i utjecaj atmosfere, odnosno visine na kojoj se letjelica nalazi. Utjecaji kuta klizanja, kao i utjecaji stlačivosti su zanemareni. Pretpostavljeno je da se spuštanje vrši bez skretanja i valjanja pa je zanemaren utjecaj kormila pravca na aerodinamiku. Promatran je samo uzdužni model aerodinamike sa nelinearnim aerodinamičkim koeficijentima. Promatrana je izvedivost ravnotežnog leta s raznim konfiguracijama upravljačkih površina, u obe faze spuštanja. Provedena je i linearna analiza te se ispitala njena primjenjivost na ovakav problem.

Abstract (english)

In this work, an analysis of the trimmed atmospheric flight of a space vehicle, the Raketoplan, similar to the HL-20 spacecraft that NASA researched during the 1990s, has been conducted. Spacecraft is constructed using the lifting body concept, meaning that spacecraft's fuselage alone produces lift, which makes need for large wings obsolete. Specifically, the analysis examines descent in trim and approach to landing. The aerodynamic coefficients used in the analysis were obtained through testing models in two different American wind tunnels and were published by NASA. Altitudes and velocity profiles were selected to closely match the mission the spacecraft would perform in reality. The influence of the atmosphere, or the altitude at which the spacecraft is located, was also taken into account. It is assumed that the descent is conducted without pitch and roll, thus neglecting the influence of the rudder on aerodynamics. Only the longitudinal model of aerodynamics with nonlinear aerodynamic coefficients is considered. The feasibility of trimmed flight is observed with various configurations of control surfaces in both descent phases. Linear analysis has also been conducted to examine its applicability to this problem.

• Keywords: svemirska letjelica; ravnotežni let; prilaz slijetanju; nelinearni aerodinamički model
• Keywords (english): spacecraft; trimmed flight; landing approach; nonlinear aerodynamic model
• Language: croatian
• URN:NBN: urn:nbn:hr:235:153206
• 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: 2024-02-23 13:08:16