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Modelling aileron and spoiler deflections with the linear frequency domain method (LFD) for subsonic flight conditions

Kuharaaj Govindan (Department of Transport Aircraft, German Aerospace Center (DLR), Braunschweig, Germany)
Niko Bier (Department of Transport Aircraft, German Aerospace Center (DLR), Braunschweig, Germany)

International Journal of Numerical Methods for Heat & Fluid Flow

ISSN: 0961-5539

Article publication date: 5 December 2022

12

Abstract

Purpose

This study aims to predict dynamic responses of aileron and spoiler control surfaces in subsonic flight via the use of surrogate models. The prepared reduced order models prove useful when quick estimations for a large number of variations are required.

Design/methodology/approach

The linear frequency domain (LFD) method was used for the simulation study. Each surrogate contained a database of 100 control surface dynamic responses over a spectrum of 200 harmonics computed with LFD. To interpolate new results, the DLR surrogate modelling toolbox, SMARTy, was used. The database’s samples were prepared in a Halton sequence, making interpolation reliable. The surrogate’s parameter space was the Mach number, Reynold’s number, angle of attack, control surface deflection angle and the control surface chord length.

Findings

The LFD method proved effective for the mentioned purpose: the surrogates were accurate, up to 15% of relative error, in reproducing dynamic responses of aileron and spoiler deflections at low speed, within the limitations of flow field linearity, as well as surrogate prediction capability. The restrictions of the surrogate, and the reasoning thereof, are also presented in detail in the study. Future load alleviation studies are a potential of the findings here.

Originality/value

LFD is an innovative technique for load prediction and alleviation studies. This paper provides a reference for engineers wishing to use the method for the two mentioned control surfaces, or the like.

Keywords

Acknowledgements

This work has been funded by the German Ministry of Economic Affairs and Climate Action (BMWK) on decision of the German Parliament in the frame of the INTELWI project (funding reference no. 20A1903L).

Thank you also to colleagues Ruben Seidler and Markus Widhalm for their time during consultations. Their valuable advice in regards to their work with the LFD method was of great help and is much appreciated.

Citation

Govindan, K. and Bier, N. (2022), "Modelling aileron and spoiler deflections with the linear frequency domain method (LFD) for subsonic flight conditions", International Journal of Numerical Methods for Heat & Fluid Flow, Vol. ahead-of-print No. ahead-of-print. https://doi.org/10.1108/HFF-09-2022-0519

Publisher

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Emerald Publishing Limited

Copyright © 2022, Emerald Publishing Limited

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