A multi-level set gradient based algorithm for buckling optimization of blended composite structures

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

Abstract

An approach is presented for the optimization of stiffened composite skins, which guarantees the continuity (blending) of plies over all individual panels. To fulfill design guidelines with respect to symmetry, balance, contiguity, disorientation and percentage rule of the layup, first a stacking sequence table is generated. Next, a novel multi-level set gradient based method is introduced for the global optimization of the location of ply drops. The method aims to turn the discrete optimization problem associated with the integer number of plies into a continuous one. It gives the optimum thickness distribution over the structure in relation to the specific table of stacking sequence. The proposed method is applied to the optimization of the layup of a composite stiffened skin of a structure resembling a wing, considering constraints on the local buckling load. During gradient based buckling optimization it is crucial to take switching of the critical buckling mode into account. An effective method is presented to achieve this and the point of implementation is discussed in detail. Optimum design of a stiffened structure resembling the upper panel of a wing torsion box subjected to different in-plane normal and shear loads is optimized subjected to no local buckling constraint.
Original languageEnglish
Title of host publication5th Aircraft Structural Design Conference
Place of PublicationManchester
PublisherRoyal Aeronautical Society
Pages-
Publication statusPublished - 2016

Publication series

Name
PublisherRoyal Aeronautical Society

Fingerprint

Composite structures
Buckling
Skin
Composite materials
Global optimization
Torsional stress

Keywords

  • METIS-320057
  • IR-102766

Cite this

Farzan Nasab, F., Geijselaers, H. J. M., & de Boer, A. (2016). A multi-level set gradient based algorithm for buckling optimization of blended composite structures. In 5th Aircraft Structural Design Conference (pp. -). Manchester: Royal Aeronautical Society.
Farzan Nasab, Farshad ; Geijselaers, Hubertus J.M. ; de Boer, Andries. / A multi-level set gradient based algorithm for buckling optimization of blended composite structures. 5th Aircraft Structural Design Conference. Manchester : Royal Aeronautical Society, 2016. pp. -
@inproceedings{9a07d5f3da0e4d1b851fc013642472a1,
title = "A multi-level set gradient based algorithm for buckling optimization of blended composite structures",
abstract = "An approach is presented for the optimization of stiffened composite skins, which guarantees the continuity (blending) of plies over all individual panels. To fulfill design guidelines with respect to symmetry, balance, contiguity, disorientation and percentage rule of the layup, first a stacking sequence table is generated. Next, a novel multi-level set gradient based method is introduced for the global optimization of the location of ply drops. The method aims to turn the discrete optimization problem associated with the integer number of plies into a continuous one. It gives the optimum thickness distribution over the structure in relation to the specific table of stacking sequence. The proposed method is applied to the optimization of the layup of a composite stiffened skin of a structure resembling a wing, considering constraints on the local buckling load. During gradient based buckling optimization it is crucial to take switching of the critical buckling mode into account. An effective method is presented to achieve this and the point of implementation is discussed in detail. Optimum design of a stiffened structure resembling the upper panel of a wing torsion box subjected to different in-plane normal and shear loads is optimized subjected to no local buckling constraint.",
keywords = "METIS-320057, IR-102766",
author = "{Farzan Nasab}, Farshad and Geijselaers, {Hubertus J.M.} and {de Boer}, Andries",
year = "2016",
language = "English",
publisher = "Royal Aeronautical Society",
pages = "--",
booktitle = "5th Aircraft Structural Design Conference",
address = "United Kingdom",

}

Farzan Nasab, F, Geijselaers, HJM & de Boer, A 2016, A multi-level set gradient based algorithm for buckling optimization of blended composite structures. in 5th Aircraft Structural Design Conference. Royal Aeronautical Society, Manchester, pp. -.

A multi-level set gradient based algorithm for buckling optimization of blended composite structures. / Farzan Nasab, Farshad; Geijselaers, Hubertus J.M.; de Boer, Andries.

5th Aircraft Structural Design Conference. Manchester : Royal Aeronautical Society, 2016. p. -.

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

TY - GEN

T1 - A multi-level set gradient based algorithm for buckling optimization of blended composite structures

AU - Farzan Nasab, Farshad

AU - Geijselaers, Hubertus J.M.

AU - de Boer, Andries

PY - 2016

Y1 - 2016

N2 - An approach is presented for the optimization of stiffened composite skins, which guarantees the continuity (blending) of plies over all individual panels. To fulfill design guidelines with respect to symmetry, balance, contiguity, disorientation and percentage rule of the layup, first a stacking sequence table is generated. Next, a novel multi-level set gradient based method is introduced for the global optimization of the location of ply drops. The method aims to turn the discrete optimization problem associated with the integer number of plies into a continuous one. It gives the optimum thickness distribution over the structure in relation to the specific table of stacking sequence. The proposed method is applied to the optimization of the layup of a composite stiffened skin of a structure resembling a wing, considering constraints on the local buckling load. During gradient based buckling optimization it is crucial to take switching of the critical buckling mode into account. An effective method is presented to achieve this and the point of implementation is discussed in detail. Optimum design of a stiffened structure resembling the upper panel of a wing torsion box subjected to different in-plane normal and shear loads is optimized subjected to no local buckling constraint.

AB - An approach is presented for the optimization of stiffened composite skins, which guarantees the continuity (blending) of plies over all individual panels. To fulfill design guidelines with respect to symmetry, balance, contiguity, disorientation and percentage rule of the layup, first a stacking sequence table is generated. Next, a novel multi-level set gradient based method is introduced for the global optimization of the location of ply drops. The method aims to turn the discrete optimization problem associated with the integer number of plies into a continuous one. It gives the optimum thickness distribution over the structure in relation to the specific table of stacking sequence. The proposed method is applied to the optimization of the layup of a composite stiffened skin of a structure resembling a wing, considering constraints on the local buckling load. During gradient based buckling optimization it is crucial to take switching of the critical buckling mode into account. An effective method is presented to achieve this and the point of implementation is discussed in detail. Optimum design of a stiffened structure resembling the upper panel of a wing torsion box subjected to different in-plane normal and shear loads is optimized subjected to no local buckling constraint.

KW - METIS-320057

KW - IR-102766

M3 - Conference contribution

SP - -

BT - 5th Aircraft Structural Design Conference

PB - Royal Aeronautical Society

CY - Manchester

ER -

Farzan Nasab F, Geijselaers HJM, de Boer A. A multi-level set gradient based algorithm for buckling optimization of blended composite structures. In 5th Aircraft Structural Design Conference. Manchester: Royal Aeronautical Society. 2016. p. -