Accession Number : ADP010490


Title :   Methode d'Identification des Forces Aerodynamiques Instationnaires sur les Essais en Vol, Validation Experimentale (Method of Mathematical Identification of Unsteady Airloads From Flight Measurements, Experimental Validation)


Corporate Author : AVIATION MARCEL DASSAULT CEDEX (FRANCE)


Personal Author(s) : Petiau, C ; Garrigues, E ; Nicot,


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/p010490.pdf


Report Date : May 2000


Pagination or Media Count : 8


Abstract : Since the end of the 7Oies we have developed, within the frame of our ELFINI software, original techniques for mathematical model identification, in particular for calibration of dynamic Finite Element models from ground vibration tests and of steady aeroelastic loads from flight tests. Now we have tackled calibration of unsteady airloads from flight vibration tests. Mathematically speaking, we keep the same approach, which differs notably from classical least square methods (minimization of a calculation - measurement distance in function of calibration parameters). We prefer to use a quadratic optimization type approach with the minimization of a distance between calibration parameters and their theoretical or presumed values, constraining the solution to satisfy measurement reconstitution by the model at a given accuracy. Among advantages of this technique, the principal is to get rid of ill-observable parameters.


Descriptors :   *MATHEMATICAL MODELS , *FLIGHT TESTING , *MEASUREMENT , *FINITE ELEMENT ANALYSIS , *AEROELASTICITY , COMPUTER PROGRAMS , GROUND LEVEL , STEADY STATE , VIBRATION , EXPERIMENTAL DATA , SYMPOSIA , OPTIMIZATION , VALIDATION , DYNAMICS , PARAMETERS , LOADS(FORCES) , TEST METHODS , ACCURACY , IDENTIFICATION , LEAST SQUARES METHOD , QUADRATIC EQUATIONS , CALIBRATION , RANGE(DISTANCE)


Subject Categories : Aerodynamics
      Numerical Mathematics
      Operations Research


Distribution Statement : APPROVED FOR PUBLIC RELEASE