Aerodynamic Optimization Of A Biplane
Configuration Using Differential Evolution
Author(s)
R. W. Derksen & A. G. Kraj
Abstract
This paper presents our work on designing a biplane configuration that has a
minimum drag to lift ratio. This problem is a mixed optimization problem in that
both discrete and continuous variables are used. Fourteen parameters were used
to fully describe the biplane configuration and calculate performance.
Performance calculations were based on Munk’s general biplane theory. Each
wing required six parameters; airfoil profile type, span, tip and root chord
lengths, angle of attack, and sweep angle. Two parameters were used to define
the horizontal stagger and vertical gap between the two planes. The airfoil
profile types were stored in an indexed database which allowed us to obtain the
section’s aerodynamic characteristics. Our analysis showed that differential
evolution found the optimum solution quickly. The characteristics of the
resultant optimum solution will be discussed in detail, along with our
observations of how the process needs to be adjusted for optimum performance.
Keywords: aerodynamic design, optimization, biplanes, aerodynamic
configuration.
1 Introduction
The following sections will provide a brief review of the state-of-the-art of
aerodynamic optimization. This will be followed by a discussion of the
advantages and disadvantages of the biplane configuration. The introductory
comments will conclude with the motivation for doing this work.
1.1 The practice of aerodynamic optimization
A quest for performance has been a key component in the development of
aviation from the start. A great deal of this was motivated by high performance
Keywords
aerodynamic design, optimization, biplanes, aerodynamic
configuration.
Related Book
Other papers in this volume
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