Hybrid Surrogate-Based Rubber Engine Model for Aircraft Multidisciplinary Design Optimization

Häßy, Jannik; Schmeink, Jens; Becker, Richard-Gregor; Reitenbach, Stanislaus; Vieweg, Maximilian; Bekemeyer, Philipp; Merle, Andrei

doi:10.2514/6.2020-3186

Cited by 2 publications

(9 citation statements)

References 16 publications

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“…Seitz et al [17] created a purely surrogate-based rubber engine model that can provide the continuous operational performance over the flight envelope for each engine individually. Häßy et al [18], author of this paper, presented a concept for a hybrid surrogate-based approach that combines aspects of 'direct-integration' with a 'surrogate-based' concept. This hybrid concept uses surrogate models to store design information for a range of different engine designs.…”

Section: B State Of the Artmentioning

confidence: 99%

“…The purpose of this publication is to present the application of the hybrid surrogate-based rubber engine approach that was proposed by Häßy et al in [18]. Therefore, a rubberized generic geared turbofan with an entry into service in 2035 is integrated into a collaborative workflow for OAD to equip a long-haul, wide-body aircraft with different suitably sized engines from a multidimensional design space.…”

Section: Objectives and Research Questionsmentioning

confidence: 99%

“…A hybrid surrogate-based rubber engine approach is employed according to the description in [18] and as depicted in Fig. 1.…”

Section: A Rubber Engine Conceptmentioning

confidence: 99%

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The Virtual Propulsion Expert: Application of a Hybrid Surrogate-Based Rubber Engine Model in Aircraft Design

Häßy

2023

AIAA AVIATION 2023 Forum

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An aircraft is a complex system of systems. The engine, as a subsystem, strongly influences the design of other subsystems in a complex interplay by its performance characteristics, dimensions and mass. The ability to reliably model the overall aircraft and to find optimal designs within a short period of time is critical in the conceptual design phase to provide the basis for sound decision making. However, this is difficult to achieve since simplified engine models may lead to unreasonable results and more sophisticated models usually require the consultation of a propulsion expert. Therefore, a hybrid surrogate-based rubber engine approach is demonstrated that facilitates the exchange of disciplinary knowledge and enables the convenient integration of detailed engine models into multidisciplinary processes for overall aircraft design. A rubberized generic geared turbofan with an entry into service in 2035 is created to equip a long-haul, wide-body aircraft with different suitably sized engines from a multidimensional design space. In order to generate the training data for the surrogate-based rubber engine model, a multidisciplinary process for conceptual engine design is employed, which combines a multi point thermodynamic cycle analysis with flow path sizing, a basic aerodynamic analysis of turbomachinery, mass estimation on the level of single engine parts and a model to predict engine emissions. With the rubber engine model integrated into the aircraft design process, the off-design performance of individual engines is provided on-demand via tabulated maps, which are calculated in-the-loop. For a long-haul aircraft configuration, a bypass ratio of 14 is identified as optimal in terms of mission fuel considering snow ball effects. For growing bypass ratios, the thrust lapse increases leading to higher combustor inlet temperature and pressure at cruise operation. As a result, nitrogen oxide emissions increase with BPR for an assumed rich-burn quick-quench lean-burn (RQL) combustor and counteract savings in carbon dioxide and water emissions leading to minimum climate impact for a bypass ratio of 11. The minimum direct operating costs are realized for a bypass ratio of 12.

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Section: B State Of the Artmentioning

confidence: 99%

Section: Objectives and Research Questionsmentioning

confidence: 99%

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The Virtual Propulsion Expert: Application of a Hybrid Surrogate-Based Rubber Engine Model in Aircraft Design

Häßy

2023

AIAA AVIATION 2023 Forum

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“…In order to cover the most important coupling influences between the aircraft and the engine during the MDO, not only performance parameters like the fuel consumption but also the engine dimensions, weight and center of gravity have to be provided. Therefore, an engine design methodology has been developed that combines thermodynamic cycle analysis with a knowledge-based procedure for geometry modeling and a semi-empirical part-based method for engine weight estimation [28]. The design of the thermodynamic cycle is performed within an iterative process considering technological constraints as well as requirements arising from the overall aircraft design, e.g.…”

Section: Fig 24 Representation Of Load Introduction Areas Of the Xrf1...mentioning

confidence: 99%

“…The combination of the geometry and the weight of parts leads to the center of gravity of the engine. In order to integrate the engine design into the MDO process, the approach of a hybrid surrogate-based rubber engine model was pursued [28]. The rubber engine model covers a range of engine designs for different combinations of design variables and requirements.…”

Section: Fig 24 Representation Of Load Introduction Areas Of the Xrf1...mentioning

confidence: 99%

Overview of Collaborative Multi-Fidelity Multidisciplinary Design Optimization Activities in the DLR Project VicToria

Goertz

Abu-Zurayk

Ilić

et al. 2020

Aiaa Aviation 2020 Forum

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Hybrid Surrogate-Based Rubber Engine Model for Aircraft Multidisciplinary Design Optimization

Cited by 2 publications

References 16 publications

The Virtual Propulsion Expert: Application of a Hybrid Surrogate-Based Rubber Engine Model in Aircraft Design

The Virtual Propulsion Expert: Application of a Hybrid Surrogate-Based Rubber Engine Model in Aircraft Design

Overview of Collaborative Multi-Fidelity Multidisciplinary Design Optimization Activities in the DLR Project VicToria

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