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Research on Constellation Refueling Based on Formation Flying

Author: FengQuanSheng
Tutor: XuBo
School: Nanjing University of Aeronautics and Astronautics
Course: Navigation,Guidance and Control
Keywords: Supplier worker formation flying constellation refueling fuel transferred fuel utilization genetic algorithm
CLC: V526
Type: Master's thesis
Year: 2011
Downloads: 14
Quote: 0
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Abstract


In this paper, some sticking points of the key techniques in constellation refueling based on formation flying, such as co-planar refueling with time constraint, non-planar refueling with time constraint, single supplier refueling and double suppliers refueling, are studied. Research works in this thesis are summarized as follows:1. Unlike the spacecraft refueling based on traditional rendezvous and docking, a new scheme called constellation refueling based on formation flying is proposed in this paper, and the theory foundation of constellation refueling based on formation flying is also systematically expounded.2. Two challenges for the optimal refueling scheduling for constellation have been addressed. The first one is to select the worker that needs to be refueled first, and the other one is to determine the refueling sequence for the rest of workers. Besides, algorithms for selecting the first refueled worker for both co-planar and non-planar are also presented.3. The model of constellation refueling based on formation flying is built. The trajectory design of the supplier is presented first, and then both the fuel consumed for the supplier to perform orbit maneuvers and the fuel transferred to the workers are all optimized by genetic algorithm for the purpose of maximizing the utilization ratio of fuel of the single supplier refueling strategy.4. To solve the problem of limited refuel ability afforded by single supplier, double supplier refueling strategy is introduced. The model of double supplier refueling based on formation flying is built first on the foundation of single supplier refueling, and then genetic algorithm is used for optimizing both the fuel consumed for the supplier to perform orbit maneuvers and the fuel transferred to the workers in order to maximize the utilization ratio of fuel of the double supplier refueling strategy.5. Realize the bidirectional solution to constellation refueling: given the initial mass of the supplier, determining the maximum fuel transferred to the worker using genetic algorithm; given the fuel transferred to the worker, determining the minimum initial mass of the supplier using genetic algorithm.6. Many cases for constellation refueling based on formation flying, such as the supplier locates on the same plane with constellation or not, refueling period is time restricted or not, are studied, and corresponding solution for each case is provided. The relationship between the utilization ratio of fuel and the fuel transferred, refueling period, fuel ratio of the supplier and the orbit altitude of the workerare also analyzed in detail.

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