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Multidisciplinary design optimization using multiobjective formulation techniquesThis report addresses the development of a multidisciplinary optimization procedure using an efficient semi-analytical sensitivity analysis technique and multilevel decomposition for the design of aerospace vehicles. A semi-analytical sensitivity analysis procedure is developed for calculating computational grid sensitivities and aerodynamic design sensitivities. Accuracy and efficiency of the sensitivity analysis procedure is established through comparison of the results with those obtained using a finite difference technique. The developed sensitivity analysis technique are then used within a multidisciplinary optimization procedure for designing aerospace vehicles. The optimization problem, with the integration of aerodynamics and structures, is decomposed into two levels. Optimization is performed for improved aerodynamic performance at the first level and improved structural performance at the second level. Aerodynamic analysis is performed by solving the three-dimensional parabolized Navier Stokes equations. A nonlinear programming technique and an approximate analysis procedure are used for optimization. The proceduredeveloped is applied to design the wing of a high speed aircraft. Results obtained show significant improvements in the aircraft aerodynamic and structural performance when compared to a reference or baseline configuration. The use of the semi-analytical sensitivity technique provides significant computational savings.
Document ID
19960001205
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Chattopadhyay, Aditi (Arizona State Univ. Tempe, AZ, United States)
Pagaldipti, Narayanan S. (Arizona State Univ. Tempe, AZ, United States)
Date Acquired
September 6, 2013
Publication Date
August 1, 1995
Subject Category
Aerodynamics
Report/Patent Number
NASA-CR-199290
NAS 1.26:199290
Accession Number
96N11212
Funding Number(s)
CONTRACT_GRANT: NCA2-778
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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