Multidisciplinary optimization of composite wings using refined structural and aeroelastic analysis methodologies

Ratneshwar Jha, Aditi Chattopadhyay

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

An integrated multidisciplinary procedure has been developed for structural and aeroelastic optimization of composite wings based on refined analysis techniques. A refined higher-order theory is used to analyze a composite box beam, which represents the load carrying member of the wing. Unsteady aerodynamic computations are performed using a panel code based on the constant-pressure lifting surface method. Flutter/divergence dynamic pressure is obtained by the Laplace domain method through rational function approximation of unsteady aerodynamic loads. The objective of the optimization procedure is to minimize wing structural weight with constraints on flutter/divergence speed and stresses at the root due to the static load. Composite ply orientations and laminate thicknesses are used as design variables. The Kreisselmeier-Steinhauser function approach is used to efficiently integrate the objective function and constraints into a single envelope function. The resulting unconstrained optimization problem is solved using the Davidon-Fletcher-Powell algorithm. Numerical results are presented showing significant improvements, after optimization, compared to a reference design.

Original languageEnglish (US)
Pages (from-to)59-78
Number of pages20
JournalEngineering Optimization
Volume32
Issue number1
StatePublished - 1999

Fingerprint

Flutter
Composite
Aerodynamics
Optimization
Methodology
Divergence
Composite materials
Rational Approximation
Laminates
Unconstrained Optimization
Function Approximation
Laplace
Aerodynamic loads
Rational function
Flutter (aerodynamics)
Envelope
Rational functions
Objective function
Integrate
Roots

ASJC Scopus subject areas

  • Management Science and Operations Research
  • Engineering (miscellaneous)

Cite this

Multidisciplinary optimization of composite wings using refined structural and aeroelastic analysis methodologies. / Jha, Ratneshwar; Chattopadhyay, Aditi.

In: Engineering Optimization, Vol. 32, No. 1, 1999, p. 59-78.

Research output: Contribution to journalArticle

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