January 9, 2018 Journal article Open Access

Bertolazzi, Enrico; Biral, Francesco; Ragni, Matteo

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    "description": "<p>The GTOC9 competition requires the design of a sequence of missions to remove debris from the LEO orbit. A mission is a sequence of transfer of the spacecraft from one debris&nbsp;to another. Both missions and transfer must fulfill a set of constraints. The work presents the procedures to develop a solution for the GTOC9 problem (i.e the mission sequence) that does not violate constraints.The solution is obtained through an evolutionary algorithm that combines pre-computed basic missions stored in a database. The main objective of the algorithm is to minimize the overall cost of the solution, in order to maximize the competition<br>\nscore. The database of pre-computed missions is derived by connecting transfers stored in a database of transfers, through a combinatorial approach that considers the problem constraints. The database of transfer is formulated through<br>\nthe solution of a constrained minimization problem upon the control action (the magnitude of the overall impulsive velocity changes <span class=\"math-tex\">\\(\\Delta\\)</span>V ). Only a subset of all possible transfers (selected on the basis of acceptable <span class=\"math-tex\">\\(\\Delta\\)</span> V ), enters in the database.</p>", 
    "license": {
      "id": "CC-BY-4.0"
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    "title": "GTOC 9: Results from University of Trento (team ELFMAN)", 
    "journal": {
      "issue": "11", 
      "pages": "79-90", 
      "title": "Acta Futura"
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        "affiliation": "DEPARTMENT OF INDUSTRIAL ENGINEERING, UNIVERSITY OF TRENTO", 
        "name": "Bertolazzi, Enrico"
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        "affiliation": "DEPARTMENT OF INDUSTRIAL ENGINEERING, UNIVERSITY OF TRENTO", 
        "name": "Biral, Francesco"
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        "affiliation": "DEPARTMENT OF INDUSTRIAL ENGINEERING, UNIVERSITY OF TRENTO", 
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