國立虎尾科技大學 |

Evaluation of Effective Elastic Properties of Honeycomb Sandwich Structures by Optimization Involving Modal Behavior = Dinamik Davranışı Kapsayacak Şekilde Optimizasyon ile Balpeteği Sandviç Yapıların Etkin Malzeme Özelliklerinin Bulunması /

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Evaluation of Effective Elastic Properties of Honeycomb Sandwich Structures by Optimization Involving Modal Behavior/ Okan Çınar.
Reminder of title:	Dinamik Davranışı Kapsayacak Şekilde Optimizasyon ile Balpeteği Sandviç Yapıların Etkin Malzeme Özelliklerinin Bulunması /
Author:	Çınar, Okan,
Description:	1 electronic resource (148 pages)
Notes:	Source: Masters Abstracts International, Volume: 86-05.
Contained By:	Masters Abstracts International86-05.
Subject:	Honey. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=31664483
ISBN:	9798342534260

Evaluation of Effective Elastic Properties of Honeycomb Sandwich Structures by Optimization Involving Modal Behavior = Dinamik Davranışı Kapsayacak Şekilde Optimizasyon ile Balpeteği Sandviç Yapıların Etkin Malzeme Özelliklerinin Bulunması /
Çınar, Okan,

Evaluation of Effective Elastic Properties of Honeycomb Sandwich Structures by Optimization Involving Modal BehaviorDinamik Davranışı Kapsayacak Şekilde Optimizasyon ile Balpeteği Sandviç Yapıların Etkin Malzeme Özelliklerinin Bulunması / [electronic resource] =Okan Çınar. - 1 electronic resource (148 pages)

Source: Masters Abstracts International, Volume: 86-05.

This thesis aims to develop an alternative approach which estimates the effective elastic properties of 2D orthotropic equivalent model of the honeycomb core material. For this purpose, 3D detailed finite element (FE) model of honeycomb structure, with the actual cell geometry and the face sheets, is used as the reference structure. Effective elastic properties of the equivalent 2D orthotropic model, representing the honeycomb core, are determined by means optimization. The objective function of the optimization is defined as the minimization of the error function expressed as the difference of the natural frequency results of certain number of modes of the reference 3D detailed FE model and the equivalent model of the sandwich structure with the honeycomb core. The effective material properties of the 2D orthotropic equivalent model of the honeycomb core are used as the design variables to optimize. The genetic algorithm that available in MATLAB Optimization Toolbox is used as optimizer, and MSC Nastran is used as the finite element solver to perform the modal analysis of the sandwich plates with honeycomb material as the core. Optimizer and the finite element solver are coupled by means of an interface code which is developed in the MATLAB environment. The studies in the literature, in which the effective material properties of the orthotropic equivalent model are estimated analytically, are also used for comparison purposes. Moreover, the effective material properties predicted analytically are used as the initial population of the optimization in genetic algorithm. The results show that developed approach predicts more accurate orthotropic effective material properties for the honeycomb than the present analytical models predict.

English

ISBN: 9798342534260Subjects--Topical Terms:

1026689
Honey.

Evaluation of Effective Elastic Properties of Honeycomb Sandwich Structures by Optimization Involving Modal Behavior = Dinamik Davranışı Kapsayacak Şekilde Optimizasyon ile Balpeteği Sandviç Yapıların Etkin Malzeme Özelliklerinin Bulunması /
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520 # $a This thesis aims to develop an alternative approach which estimates the effective elastic properties of 2D orthotropic equivalent model of the honeycomb core material. For this purpose, 3D detailed finite element (FE) model of honeycomb structure, with the actual cell geometry and the face sheets, is used as the reference structure. Effective elastic properties of the equivalent 2D orthotropic model, representing the honeycomb core, are determined by means optimization. The objective function of the optimization is defined as the minimization of the error function expressed as the difference of the natural frequency results of certain number of modes of the reference 3D detailed FE model and the equivalent model of the sandwich structure with the honeycomb core. The effective material properties of the 2D orthotropic equivalent model of the honeycomb core are used as the design variables to optimize. The genetic algorithm that available in MATLAB Optimization Toolbox is used as optimizer, and MSC Nastran is used as the finite element solver to perform the modal analysis of the sandwich plates with honeycomb material as the core. Optimizer and the finite element solver are coupled by means of an interface code which is developed in the MATLAB environment. The studies in the literature, in which the effective material properties of the orthotropic equivalent model are estimated analytically, are also used for comparison purposes. Moreover, the effective material properties predicted analytically are used as the initial population of the optimization in genetic algorithm. The results show that developed approach predicts more accurate orthotropic effective material properties for the honeycomb than the present analytical models predict.
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