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Optimization of a Two Shaft Generic Turbofan Engine

Tröltzsch, Anke and Siggel, Martin and Becker, Richard-Gregor (2018) Optimization of a Two Shaft Generic Turbofan Engine. 6th European Seminar on Computing (ESCO), 3.-8. Juni 2018, Pilsen, Tschechien.

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Abstract

We would like to present our software package ECDFO (Equality-Constrained Derivative-Free Optimization) which applies a model-based trust-region SQP algorithm. ECDFO was extended to handle bound constraints as this is essential if we want to apply the optimizer to real-life applications. Derivative-free optimization algorithms are widely used in practice for several reasons: the explicit evaluation of the derivatives may be impossible, very time-consuming or very inexact. The algorithm ECDFO has shown competitive performance on analytical test problems, compared to other publicly available derivative-free optimization software packages. Here, the software package ECDFO is applied to the optimization of an aero engine performance model of a two shaft generic turbofan engine. The objective is to minimize the thrust specific fuel consumption with respect to several thermodynamic design parameters and, subject to several bound- and equality-constraints. In order to provide some insight into the optimization problem, results of a parametric study on the problem conducted prior to the optimization are presented briefly. The simulation of the aero engine performance model is performed by the simulation code GTlab-Performance, developed at the German Aerospace Center (DLR). The optimization package ECDFO is compared to the two publicly available optimization codes ALGENCAN (Augmented Lagrangian Line Search Method using Finite Differences Gradients) and ALPSO (Augmented Lagrange Multiplier Particle Swarm Optimizer as a purely derivative-free optimization method). Convergence histories of the objective function and the non-linear constraints are presented.

Item URL in elib:https://elib.dlr.de/121549/
Document Type:Conference or Workshop Item (Speech)
Title:Optimization of a Two Shaft Generic Turbofan Engine
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Tröltzsch, Ankeanke.troeltzsch (at) dlr.deUNSPECIFIED
Siggel, Martinmartin.siggel (at) dlr.deUNSPECIFIED
Becker, Richard-GregorRichard.Becker (at) dlr.deUNSPECIFIED
Date:June 2018
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Derivative-free optimization, application, turbofan engine
Event Title:6th European Seminar on Computing (ESCO)
Event Location:Pilsen, Tschechien
Event Type:international Conference
Event Dates:3.-8. Juni 2018
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Technology
DLR - Research area:Raumfahrt
DLR - Program:R SY - Technik für Raumfahrtsysteme
DLR - Research theme (Project):R - Vorhaben SISTEC
Location: Köln-Porz
Institutes and Institutions:Institut of Simulation and Software Technology > High Performance Computing
Institute of Propulsion Technology > Engine
Deposited By: Tröltzsch, Anke
Deposited On:03 Dec 2018 18:01
Last Modified:03 Dec 2018 18:01

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