Multi-Objective Optimization of Stiffened, Fiber-Reinforced Composite Fuselages for Mechanical and Vibro-Acoustic Requirements

Serhat, Gokhan; Faria, Tiago Goncalves; Basdogan, Ipek

doi:10.2514/6.2016-3509

Cited by 4 publications

(3 citation statements)

References 18 publications

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“…As a remedy, the lamination parameters approach was introduced to determine globally optimal laminate configurations [ 19 ]. This formulation method also provides convex solutions for various quantities such as natural frequencies, buckling load, and effective stiffness [ 20 , 21 , 22 ] except for certain metrics such as the forced vibration responses [ 23 , 24 ].…”

Section: Introductionmentioning

confidence: 99%

Concurrent Lamination and Tapering Optimization of Cantilever Composite Plates under Shear

Serhat

2021

Materials

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The operational performance of cantilever composite structures can benefit from both stiffness tailoring and geometric design, yet, this potential has not been fully utilized in existing studies. The present study addresses this problem by simultaneously optimizing layer and taper angles of cantilever laminates. The design objective is selected as minimizing the average deflection of the tip edge subjected to shear loads while keeping the length and total volume constant. The plate stiffness properties are described by lamination parameters to eliminate the possible solution dependency on the initial assumptions regarding laminate configuration. The responses are computed via finite element analyses, while optimal design variables are determined using genetic algorithms. The results demonstrate that the plate aspect ratio significantly influences the effectiveness of stiffness tailoring and tapering as well as the optimal layer and taper angles. In addition, concurrent exploitation of the lamination characteristics and plate geometry is shown to be essential for achieving maximum performance. Moreover, individual and simultaneous optimization of layer and taper angles produce different optimal results, indicating the possible drawback of using sequential approaches in similar composite design problems.

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Section: Introductionmentioning

confidence: 99%

Concurrent Lamination and Tapering Optimization of Cantilever Composite Plates under Shear

Serhat

2021

Materials

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“…As a remedy, lamination parameters have been introduced to describe the overall stiffness properties with intermediate variables [12]. This technique was also shown to provide convex solutions for certain responses such as the fundamental frequency of plates [13][14][15]. Lamination parameters have been widely used for maximizing the fundamental frequency of flat [16][17][18] and curved [19,20] laminated panels, as well as their eigenfrequency separation [10,21].…”

Section: Introductionmentioning

confidence: 99%

Design of Circular Composite Cylinders for Optimal Natural Frequencies

Serhat

2021

Materials

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This study concerns optimizing the eigenfrequencies of circular cylindrical laminates. The stiffness properties are described by lamination parameters to avoid potential solution dependency on the initial assumptions of the laminate configurations. In the lamination parameter plane, novel response contours are obtained for the first and second natural frequencies as well as their difference. The influence of cylinder length, radius, thickness, and boundary conditions on the responses is investigated. The lamination parameters yielding the maximum response values are determined, and the first two mode shapes are shown for the optimum points. The results demonstrate that the maximum fundamental frequency points of the laminated cylinders mostly lie at the inner lamination parameter domain, unlike the singly curved composite panels. In addition, the second eigenfrequency shows a nonconvex response surface containing multiple local maxima for several cases. Moreover, the frequency difference contours appear as highly irregular, which is unconventional for free vibration responses.

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“…The most significant system parameters are selected to be ply angles of the host laminated plate, piezo-patch thickness, area, and the piezoceramic material. There are some studies in the literature that focus on the selection of the composite plate ply angle to maximize the fundamental frequency of the host plate composite plate (Narita, 2003;Narita and Hodgkinson, 2005;Serhat et al, 2016). Piezoelectric parameters such as thickness, area, and material are also known to be effective on the shunt damping performance of the system (Behrens et al, 2003;Berardengo et al, 2015;Correˆa de Godoy and Trindade, 2011;Ducarne et al, 2012;Trindade and Benjeddou, 2009).…”

Section: Introductionmentioning

confidence: 99%

An investigation of the electromechanical coupling and broadband shunt damping in composite plates with integrated piezo-patches

Gozum

Aghakhani

Basdogan

2019

Journal of Intelligent Material Systems and Structures

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The popularity of laminated composite plate-like structures is increasing in various engineering applications. Piezoelectric patches with electrical circuit elements can be integrated into these structures for shunt damping applications. For analyzing the shunt damping performance of these systems, precise modeling tools are required, which consider the two-way electromechanical coupling between the piezo-patches and the host plate. This study aims to identify the system parameters which affect the electromechanical coupling coefficient, a metric for measuring the effectiveness of mechanical-to-electrical energy conversion. For that purpose, a thorough investigation is performed to determine the critical system parameters and their combined effects on the electromechanical coupling coefficient of laminated composite plates with surface-bonded piezo-patches. First, the first four natural frequencies of the electromechanical system are obtained using the Rayleigh–Ritz method for various patch sizes. Then, the electromechanical coupling coefficient variations for a different set of system parameters are presented. Later, to demonstrate the applicability of the developed methodology for a broader frequency range, four independently shunted piezo-pairs are attached to the plate. The contours of electromechanical coupling coefficient values with respect to ply angle and patch-pair size are presented for the first four modes. Finally, the vibration amplitudes are successfully reduced for these modes using the optimal system parameters.

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Multi-Objective Optimization of Stiffened, Fiber-Reinforced Composite Fuselages for Mechanical and Vibro-Acoustic Requirements

Cited by 4 publications

References 18 publications

Concurrent Lamination and Tapering Optimization of Cantilever Composite Plates under Shear

Concurrent Lamination and Tapering Optimization of Cantilever Composite Plates under Shear

Design of Circular Composite Cylinders for Optimal Natural Frequencies

An investigation of the electromechanical coupling and broadband shunt damping in composite plates with integrated piezo-patches

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