Approximate function for unsteady aerodynamic kernel function of aeroelastic lifting surfaces

Approximate function for unsteady aerodynamic kernel function of aeroelastic lifting surfaces

Prediction of unsteady aerodynamic loads is still the most challenging tasks in flutter aeroelastic analysis. Generally, the numerical estimation of steady and unsteady aerodynamics of thin lifting surface is conducted based on an integral equation relating aerodynamic pressure and normal wash ve...

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Main Authors: Sulaeman, Erwin, Ahmed, Layeeq
Format: Article
Language:English
Published: IIUM Press 2014
Subjects:
TL500 Aeronautics
Online Access:http://irep.iium.edu.my/41696/
http://irep.iium.edu.my/41696/
http://irep.iium.edu.my/41696/1/504-2058-4-PB.pdf
id iium-41696
recordtype eprints
spelling iium-416962015-02-16T02:56:11Z http://irep.iium.edu.my/41696/ Approximate function for unsteady aerodynamic kernel function of aeroelastic lifting surfaces Sulaeman, Erwin Ahmed, Layeeq TL500 Aeronautics Prediction of unsteady aerodynamic loads is still the most challenging tasks in flutter aeroelastic analysis. Generally, the numerical estimation of steady and unsteady aerodynamics of thin lifting surface is conducted based on an integral equation relating aerodynamic pressure and normal wash velocity. The present work attempts to increase the accuracy of the prediction by using an approximate approach to evaluate kernel function occurring in the integral equation in the form of cylindrical function. Following previous approximation approaches by other researchers to solve the cylindrical function for planar lifting surfaces, this paper extends such approaches to non planar lifting surfaces. To increase the accuracy of the method, the integration region of the kernel function is divided into two parts – near and far regions, where a nonlinear regression curve fitting technique is adapted to estimate the denominator part of the cylindrical function of each region IIUM Press 2014 Article PeerReviewed application/pdf en http://irep.iium.edu.my/41696/1/504-2058-4-PB.pdf Sulaeman, Erwin and Ahmed, Layeeq (2014) Approximate function for unsteady aerodynamic kernel function of aeroelastic lifting surfaces. IIUM Engineering Journal, 15 (1). pp. 71-79. ISSN 1511-788X (P) 2289-7860 (O) http://journals.iium.edu.my/ejournal/index.php/iiumej/index
repository_type Digital Repository
institution_category Local University
institution International Islamic University Malaysia
building IIUM Repository
collection Online Access
language English
topic TL500 Aeronautics
spellingShingle TL500 Aeronautics
Sulaeman, Erwin
Ahmed, Layeeq
Approximate function for unsteady aerodynamic kernel function of aeroelastic lifting surfaces
description Prediction of unsteady aerodynamic loads is still the most challenging tasks in flutter aeroelastic analysis. Generally, the numerical estimation of steady and unsteady aerodynamics of thin lifting surface is conducted based on an integral equation relating aerodynamic pressure and normal wash velocity. The present work attempts to increase the accuracy of the prediction by using an approximate approach to evaluate kernel function occurring in the integral equation in the form of cylindrical function. Following previous approximation approaches by other researchers to solve the cylindrical function for planar lifting surfaces, this paper extends such approaches to non planar lifting surfaces. To increase the accuracy of the method, the integration region of the kernel function is divided into two parts – near and far regions, where a nonlinear regression curve fitting technique is adapted to estimate the denominator part of the cylindrical function of each region
format Article
author Sulaeman, Erwin
Ahmed, Layeeq
author_facet Sulaeman, Erwin
Ahmed, Layeeq
author_sort Sulaeman, Erwin
title Approximate function for unsteady aerodynamic kernel function of aeroelastic lifting surfaces
title_short Approximate function for unsteady aerodynamic kernel function of aeroelastic lifting surfaces
title_full Approximate function for unsteady aerodynamic kernel function of aeroelastic lifting surfaces
title_fullStr Approximate function for unsteady aerodynamic kernel function of aeroelastic lifting surfaces
title_full_unstemmed Approximate function for unsteady aerodynamic kernel function of aeroelastic lifting surfaces
title_sort approximate function for unsteady aerodynamic kernel function of aeroelastic lifting surfaces
publisher IIUM Press
publishDate 2014
url http://irep.iium.edu.my/41696/
http://irep.iium.edu.my/41696/
http://irep.iium.edu.my/41696/1/504-2058-4-PB.pdf
first_indexed 2023-09-18T20:59:38Z
last_indexed 2023-09-18T20:59:38Z
_version_ 1777410536395243520

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