Uncertainty And Reliability In Aircraft Design
And Optimization
Author(s)
S. Hern´andez, J. D´ıaz, M. Cid, A. Baldomir & L. Romera
Abstract
Aircraft engineering is subjected to many classes of uncertainties due to the lack
of proper definition of loads, behaviour of new materials or even due to the
inaccuracies produced during manufacturing. Because of that, the most advanced
methods of analysis and optimization need to be used during the dimensioning
of aircraft structures. One way to increase the safety level of a design could be
to increase the safety coefficients for load values or material strength, but this
approach would lead to an unacceptable amount of material for the aircraft. More
proper approaches can be applied using probabilistic analysis during the design
phase. In that case, some of the parameters, such as loads, material properties
of manufacturing tolerances are defined as random variables and a probabilistic
analysis is carried out to identify the safety of the design. This approach can be
also enhanced by introducing the concept of design optimization. In that case the
optimum solution for an aircraft structure is obtained even considering the random
nature of some of the design variables. In this paper these methodologies will be
described and some examples of aircraft structures will be presented to show the
potential in real problems.
Keywords: uncertainty quantification, reliability based design optimization.
1 Introduction
Reliability is related with the probability of verifying a certain condition. This is
known as the probability of failure. In a probabilistic analysis, the uncertainties
in the basic magnitudes of the structure are considered directly in the analysis,
changing from fixed quantities to random variables (RV). The limit state function
defines if a design belongs to the failure domain, where the limit state is not
Keywords
uncertainty quantification, reliability based design optimization.
Related Book
Other papers in this volume
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