Impact of aeroelastic tailoring on flutter performance of variable ribs’ orientation for different wing box model planforms

For over the past decades, the basic layout of the wing-box configuration was found relatively similar and has not been drastically changed. Nevertheless, with recent advancement in additive manufacturing technology, a much complex structural design can now be manufactured with an efficiency that ca...

Full description

Saved in:

Bibliographic Details
Main Author:	Chan, Ying Nee
Format:	Thesis
Language:	English
Published:	2021
Subjects:	Airplanes - Wings Aeroelasticity
Online Access:	http://psasir.upm.edu.my/id/eprint/104155/1/GS50247%20-%20Chan%20Ying%20Nee%20-%20IR.pdf
Tags:	Add Tag No Tags, Be the first to tag this record!

id	my-upm-ir.104155
record_format	uketd_dc
spelling	my-upm-ir.1041552023-07-14T08:27:15Z Impact of aeroelastic tailoring on flutter performance of variable ribs’ orientation for different wing box model planforms 2021-05 Chan, Ying Nee For over the past decades, the basic layout of the wing-box configuration was found relatively similar and has not been drastically changed. Nevertheless, with recent advancement in additive manufacturing technology, a much complex structural design can now be manufactured with an efficiency that cannot be acquired by the conventional manufacturing process. From the conducted literature reviews, the variable ribs’ orientation concept turns out to be one of the possible options whereby several previous studies have shown that significant improvement in aeroelastic characteristics can be acquired without any increment in weight. Nevertheless, the previous works were limited to an equally ribs spacing as well as for a certain type of wing-box planforms. Hence, the current effort is to provide a much wider overview on this concept by considering a various type of wing-box planforms including the case of increasing rib’s spacing. Three variants of wing-box planforms were considered in the current work, namely untapered-unswept, untapered-sweptback, and tapered-sweptback configurations. In addition, an equal and increasing rib’s spacing arrangement for a total of 10 and 13 ribs were also taken into account. A programming routine was developed and integrated with the finite element solver, hence allowing the parametric study to be conducted in a much systematically manner. Finite element solutions of flutter analysis and normal mode analysis have been employed, with the flutter speed parameter serves as a sole cost function for the parametric investigation. Further insight was also made with respect to the variation in modal characteristics as well as the distribution in strain energy. The finding shows that the variable ribs’ orientation concept enables significant impact to any modes that incorporate with torsional characteristic, regardless of whether it is dominant or subdominant in torsional shape. As a result, the frequency gap between the flutter modes can be altered hence enables the possibility to further delay the flutter speed. Significant improvement in flutter speed was acquired within a range of 91%-93% for untapered-unswept cases, 78%-92% for untapered-sweptback cases and 56%-78% for tapered-sweptback cases when compared to their respective baseline wing-box planforms. In addition, it was also found that for all the considered cases, the optimal rib’s orientations were characterized by a zigzag profile. Airplanes - Wings Aeroelasticity 2021-05 Thesis http://psasir.upm.edu.my/id/eprint/104155/ http://psasir.upm.edu.my/id/eprint/104155/1/GS50247%20-%20Chan%20Ying%20Nee%20-%20IR.pdf text en public masters Universiti Putra Malaysia Airplanes - Wings Aeroelasticity Harmin, Mohammad Yazdi
institution	Universiti Putra Malaysia
collection	PSAS Institutional Repository
language	English
advisor	Harmin, Mohammad Yazdi
topic	Airplanes - Wings Aeroelasticity
spellingShingle	Airplanes - Wings Aeroelasticity Chan, Ying Nee Impact of aeroelastic tailoring on flutter performance of variable ribs’ orientation for different wing box model planforms
description	For over the past decades, the basic layout of the wing-box configuration was found relatively similar and has not been drastically changed. Nevertheless, with recent advancement in additive manufacturing technology, a much complex structural design can now be manufactured with an efficiency that cannot be acquired by the conventional manufacturing process. From the conducted literature reviews, the variable ribs’ orientation concept turns out to be one of the possible options whereby several previous studies have shown that significant improvement in aeroelastic characteristics can be acquired without any increment in weight. Nevertheless, the previous works were limited to an equally ribs spacing as well as for a certain type of wing-box planforms. Hence, the current effort is to provide a much wider overview on this concept by considering a various type of wing-box planforms including the case of increasing rib’s spacing. Three variants of wing-box planforms were considered in the current work, namely untapered-unswept, untapered-sweptback, and tapered-sweptback configurations. In addition, an equal and increasing rib’s spacing arrangement for a total of 10 and 13 ribs were also taken into account. A programming routine was developed and integrated with the finite element solver, hence allowing the parametric study to be conducted in a much systematically manner. Finite element solutions of flutter analysis and normal mode analysis have been employed, with the flutter speed parameter serves as a sole cost function for the parametric investigation. Further insight was also made with respect to the variation in modal characteristics as well as the distribution in strain energy. The finding shows that the variable ribs’ orientation concept enables significant impact to any modes that incorporate with torsional characteristic, regardless of whether it is dominant or subdominant in torsional shape. As a result, the frequency gap between the flutter modes can be altered hence enables the possibility to further delay the flutter speed. Significant improvement in flutter speed was acquired within a range of 91%-93% for untapered-unswept cases, 78%-92% for untapered-sweptback cases and 56%-78% for tapered-sweptback cases when compared to their respective baseline wing-box planforms. In addition, it was also found that for all the considered cases, the optimal rib’s orientations were characterized by a zigzag profile.
format	Thesis
qualification_level	Master's degree
author	Chan, Ying Nee
author_facet	Chan, Ying Nee
author_sort	Chan, Ying Nee
title	Impact of aeroelastic tailoring on flutter performance of variable ribs’ orientation for different wing box model planforms
title_short	Impact of aeroelastic tailoring on flutter performance of variable ribs’ orientation for different wing box model planforms
title_full	Impact of aeroelastic tailoring on flutter performance of variable ribs’ orientation for different wing box model planforms
title_fullStr	Impact of aeroelastic tailoring on flutter performance of variable ribs’ orientation for different wing box model planforms
title_full_unstemmed	Impact of aeroelastic tailoring on flutter performance of variable ribs’ orientation for different wing box model planforms
title_sort	impact of aeroelastic tailoring on flutter performance of variable ribs’ orientation for different wing box model planforms
granting_institution	Universiti Putra Malaysia
publishDate	2021
url	http://psasir.upm.edu.my/id/eprint/104155/1/GS50247%20-%20Chan%20Ying%20Nee%20-%20IR.pdf
_version_	1776100412996190208

Impact of aeroelastic tailoring on flutter performance of variable ribs’ orientation for different wing box model planforms

Similar Items