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Considering dynamic Pareto frontiers in decision making

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Abstract

Considering how the resolution of conflicts changes over time is an aspect of multiobjective optimization that is not commonly explored. These considerations embody changes in both the preferences that dictate the selection of Pareto designs, and changes in the Pareto frontier itself over time, or s-Pareto frontier when a set of disparate design concepts are considered. As such, this paper explores the idea of dynamic s-Pareto frontiers and preferences. Specifically, this paper presents a dynamic multiobjective optimization problem formulation that provides a framework of identifying the s-Pareto frontier for a series of time steps. The application of the presented dynamic formulation is illustrated through a simple aircraft design example. Through this example it was observed that the identification of the dynamic s-Pareto frontier enabled the observation of the impact of design decisions on the offset of selected designs from the identified dynamic frontier. By measuring and minimizing the aircraft design offset, the selected aircraft design offset was improved by an average of roughly 60 % from the next best selected alternative identified using traditional selection methods.

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Abbreviations

μ :

Vector of design objectives

x :

Vector of design variables/objects

y :

Vector of independent design objects

z :

Vector of dependent design objects

n [ ] :

indicates the number of [ ]

[ ] l :

indicates the lower limit of [ ]

[ ] u :

indicates the upper limit of [ ]

[ ] :

indicates the optimal value of [ ]

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Acknowledgements

Funding for this research was provided by the National Science Foundation Grant 0954580.

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Correspondence to Christopher A. Mattson.

Appendix A: Dynamic s-Pareto formulation inputs

Appendix A: Dynamic s-Pareto formulation inputs

For the aircraft example given in this paper there are three concepts. The variable values for these different concepts are presented in Tables 6, 7 and 8, and were selected using data provided in Heintz (2002) for various aircraft and wing configurations. The units and descriptions of these variables are given in Table 4. The rows of the tables at each time-step are the values of the diagonal matrix (\(w^{(k^{(t)})}\)) and design object limits (\(x^{(k^{(t)})}_{l}\), \(x^{(k^{(t)})}_{u}\)) for the corresponding concept. For example, the rows corresponding to χ i,i , x l , and x u for Concept 1 at t=1 represent the \(\chi^{(1^{(1)})}_{i,i}\) values of Eq. (5), \(x^{(1^{(1)})}_{l}\) values of Eq. (3), and \(x^{(1^{(1)})}_{u}\) values of Eq. (3), respectively.

Table 6 Values of the design object identifiers and limits for aircraft Concept 1 (k=1)
Table 7 Values of the design object identifiers and limits for aircraft Concept 2 (k=2)
Table 8 Values of the design object identifiers and limits for aircraft Concept 3 (k=3)

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Lewis, P.K., Tackett, M.W.P. & Mattson, C.A. Considering dynamic Pareto frontiers in decision making. Optim Eng 15, 837–854 (2014). https://doi.org/10.1007/s11081-013-9238-2

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