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S8 Engenharia Aeroespacial |
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Title:
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AIRPLANE CONCEPTUAL DESIGN IMPROVEMENT THROUGH SIMPLIFIED MULTIDISCIPLINARY OPTIMIZATION USING ANALYTIC MODELS
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Summary :
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A NUMERICAL OPTIMIZATION PROCEDURE IS PROPOSED TO OBTAIN THE BEST AIRPLANE CONFIGURATION IN THE CONCEPTUAL DESIGN PHASE OF A SUBSONIC JET TRANSPORT AIRCRAFT. IN ORDER TO DETERMINE THE "OPTIMAL AIRCRAFT" AND THE CORRESPONDING "OPTIMAL TRAJECTORY" THAT MINIMIZES A COMBINATION OF MISSION PARAMETERS, SOME MODELS FOR ESTIMATING THE AIRCRAFT PERFORMANCE HAVE BEEN SELECTED AND IMPLEMENTED. TWO DEGREES OF FREEDOM PERFORMANCE MODELS FOR CLIMB, CRUISE AND DESCENT FLIGHT PHASES ARE USED TO ESTIMATE THE AIRCRAFT FUEL CONSUMPTION AND TIME ELAPSED TO PERFORM A TYPICAL MISSION. EMPIRICAL MODELS ARE USED TO EVALUATE THE TAKEOFF AND LANDING FIELD LENGTHS WHICH ARE CONSIDERED AS OPTIMIZATION CONSTRAINTS. TO OBTAIN AN ACCURATE PREDICTION OF THE AIRPLANE DRAG, A COMPREHENSIVE MODEL HAS BEEN SELECTED DUE TO ITS CAPABILITY OF HANDLING CHANGES IN GEOMETRIC AND AERODYNAMIC DATA. EMPIRICAL METHODS WERE APPLIED TO CORRECT AIRCRAFT EMPTY WEIGHT DUE TO THE CHANGES IN DESIGN PARAMETERS. THE OPTIMIZATION CRITERIA ADOPTED IN THIS WORK ARE BASED ON LINEAR COMBINATIONS OF ESTIMATED TIME AND FUEL SPENT TO FLY A TYPICAL MISSION. THE MATHEMATICAL OPTIMIZATION IS DONE USING A COMMERCIAL CODE WHICH EMPLOYS A GRADIENT METHOD. THE RESULTS PRESENTED SHOW REASONABLE OBJECTIVE FUNCTION REDUCTION THROUGH OPTIMIZATION OF THE DESIGN AND TRAJECTORY PARAMETERS. |
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Author :
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Diniz, Paulo M. F.
Lourenção, Paulo T. M.
Rios Neto, Atair 0
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Paper View :
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