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Disserta??o Final (Corre??es) - Eduardo Mendes.pdf: 20884254 bytes, checksum: 2f9c97501da8a0259ee7afa7dee7506d (MD5)
Previous issue date: 2016-08-25 / In this research we studied evasive maneuvers to avoid collisions in an environment with debris, enabling missions to the space. When a collision occurs, usually the space vehicle is completely damaged and destroyed, thus ensuring that the satellite avoids this collision will preserve the objective of the mission. In this study, we will see how a space vehicle can perform an evasive maneuver through thedriveline under the effect of the atmospheric drag force, whose efficiency will be established through the settings of technological parameters, which are the amount of fuel in the space vehicle and the ability to eject the propellant through the propulsion system. The purpose of the evasive maneuver is to avoid the collision but to keep the vehicle in its nominal orbit. At first we found several initial conditions of collision with the space vehicle under the influence of Earth's gravitational force, to ensure that there would be a collision between objects, from that on, the propulsion force was applied, after that, considering only the effect of atmospheric drag on the objects and right after the two collisional objects were brought under the effect of both forces, the force of the atmospheric drag and the propulsion together. In search of the most economical maneuver, from the point of view of fuel consumption, maneuvers were performed with lower propulsion drive time, and at different times of the trajectory of the vehicle and also at random times with the use of the propulsion force . The maneuvers were found through numerical simulations for each mathematical model of disturbances added to the orbital dynamics under the influence of the gravitational force. / Neste trabalho, fizemos o estudo de manobras evasivas para evitar colis?es em ambiente de detritos, viabilizando as miss?es espaciais. Quando ocorre uma colis?o, normalmente o ve?culo espacial fica totalmente danificado e destru?do, portanto, garantir ao sat?lite o desvio da colis?o, preservar? o objetivo da miss?o. Neste estudo, veremos como um ve?culo espacial pode executar uma manobra evasiva, atrav?s do sistema propulsor, sob o efeito da for?a de arrasto atmosf?rico, cuja efici?ncia ser? estabelecida atrav?s das configura??es dos par?metros tecnol?gicos, sendo estes, a quantidade de combust?vel do ve?culo espacial e a capacidade de ejetar propelente pelo sistema propulsor. O objetivo da manobra evasiva ? evitar a colis?o, mas, mantendo o ve?culo em sua ?rbita nominal. A princ?pio foi encontrado um conjunto de condi??es iniciais de colis?o com o ve?culo espacial sob o efeito da for?a gravitacional da Terra, para garantir que haveria a colis?o entre os objetos e, a partir disto, foi aplicada a for?a de propuls?o, depois considerando somente o efeito do arrasto atmosf?rico sobre os objetos e logo ap?s, o ve?culo espacial e o detrito foram postos sob o efeito de ambas da for?a de propuls?o e do arrasto atmosf?rico, juntas. Em busca da manobra mais econ?mica, do ponto de vista do consumo de combust?vel, foram executadas manobras com tempo de acionamento de propuls?o menor, e em diferentes momentos da trajet?ria do ve?culo e tamb?m por tempos aleat?rios de acionamento de for?a de propuls?o. As manobras foram determinadas atrav?s de simula??es num?ricas para cada modelo matem?tico das perturba??es adicionadas ? din?mica orbital sob o efeito da for?a gravitacional.
| Identifer | oai:union.ndltd.org:IBICT/oai:tede2.uefs.br:8080:tede/450 |
| Date | 25 August 2016 |
| Creators | Oliveira, Eduardo Mendes |
| Contributors | Jesus, Ant?nio Delson Concei??o de |
| Publisher | Universidade Estadual de Feira de Santana, Mestrado em Computa??o Aplicada, UEFS, Brasil, DEPARTAMENTO DE TECNOLOGIA |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Format | application/pdf |
| Source | reponame:Biblioteca Digital de Teses e Dissertações da UEFS, instname:Universidade Estadual de Feira de Santana, instacron:UEFS |
| Rights | info:eu-repo/semantics/openAccess |
| Relation | 303317282311144204, 600, 600, 600, 4335108523020347051, 1231144342511031835 |
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