EBF3PanelOpt: An optimization framework for curvilinear blade-stiffened panels

Mulani, Sameer B.; Slemp, Wesley C. H.; Kapania, Rakesh K.

doi:10.1016/j.tws.2012.09.008

Cited by 98 publications

(32 citation statements)

References 17 publications

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“…The B-spline can maintain the smoothness of the shell surface and thus reduce the risk of fuel leak. Also, as a result of its simplicity and flexibility, the B-spline shape has been applied to the design of curvilinear stiffeners [32].…”

Section: Generatrix Optimization Framework For Low Imperfection Sensimentioning

confidence: 99%

Generatrix shape optimization of stiffened shells for low imperfection sensitivity

Wang

Hao

et al. 2014

Sci. China Technol. Sci.

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According to previous studies, stiffened shells with convex hyperbolic generatrix shape are less sensitive to imperfections. In this study, the effects of generatrix shape on the performances of elastic and plastic buckling in stiffened shells are investigated. Then, a more general description of generatrix shape is proposed, which can simply be expressed as a convex B-spline curve (controlled by four key points). An optimization framework of stiffened shells with a convex B-spline generatrix is established, with optimization objective being measured in terms of nominal collapse load, which can be expressed as a weighted sum of geometrically imperfect shells. The effectiveness of the proposed framework is demonstrated by a detailed comparison of the optimum designs for the B-spline and hyperbolic generatrix shapes. The decrease of imperfection sensitivity allows for a significant weight saving, which is particularly important in the development of future heavy-lift launch vehicles. stiffened shell, collapse, imperfection sensitivity, generatrix shape, optimization Citation:Wang B, Hao P, Li G, et al. Generatrix shape optimization of stiffened shells for low imperfection sensitivity.

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Section: Generatrix Optimization Framework For Low Imperfection Sensimentioning

confidence: 99%

Generatrix shape optimization of stiffened shells for low imperfection sensitivity

Wang

Hao

et al. 2014

Sci. China Technol. Sci.

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“…[18][19][20][21][22][23][24][25] Our well established development of curvilinear blade-stiffened panel framework is discussed. [26][27][28][29][30][31][32][33][34] Currently, EBF3PanelOpt framework allows the user to perform multi-objective design optimization of flat multi-sided panels with straight/curved edges having curvilinear, blade and 'T' stiffeners. In the case of T-stiffened panels [35][36] , the additional option is provided to apply compression directly to the stiffeners.…”

Section: Ebf3panelopt Frameworkmentioning

confidence: 99%

“…Using maximum constraint value might display a discontinuous behavior. The von Mises stresses for all elements aggregated using Kreisselmeier and Steinhauser (KS) criteria 33 .…”

Section: A Structural Optimizationmentioning

confidence: 99%

EBF3PanelOpt: A Computational Design Environment for Panels Fabricated by Additive Manufacturing

Kapania

Mulani

Tamijani

et al. 2013

51st AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition

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We have developed an optimization framework, EBF3PanelOpt to design stiffened panels with curvilinear stiffeners. The curvilinear stiffening tries to utilize the larger design space created by such additive manufacturing techniques like Electron Beam Free Form Fabrication, Friction Stir Welding, and Selective Laser Sintering. Structural loads of future aerospace vehicles may not be well characterized using our knowledge-based databases, so medium-fidelity modeling capabilities of software, Msc.Patran (geometry and meshing), and Msc.Nastran (finite element analysis) are integrated in EBF3PanelOpt. The EBF3PanelOpt minimizes the mass of the stiffened panel with the constraints on buckling, von Mises stress and crippling of the stiffeners. The panel/stiffener geometry is parameterized using design variables that include variables for orientation and shape of the stiffeners, the thicknesses and height of the stiffeners, and the plate thickness. The plate can have uniform thickness or non-uniform thicknesses for the pockets created by the stiffeners. The EBF3PanelOpt is enhanced to have curvilinear T stiffeners with or without axial loads in addition to loads through plate Both the vibro-acoustic and structural optimization are supported using multi-objective optimization in EBF3PanelOpt. To enhance the computational efficiency, an improved surrogate model built using artificial neural network and kriging is utilized. To quantify the uncertainty in the design variables or parameters, reliability analysis is supported in EBF3PanelOpt.

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“…Stiffening structures is a techno-economic compromise that offer weight saving by using less manufactured material against subjected load conditions, it is more practical to use additional stiffeners than just increasing of thickness of the plate [1,2]. The common way to optimize stiffened panel's performances in aerospace application has to start with calculating the critical loading, more the structure is needed to carry loads more it has to be better reinforced [3,4]. It is significant to give a structural design that handle the listed issues.…”

Section: Introductionmentioning

confidence: 99%

Topology Optimization and Design Guidelines of Sub-Stiffened Panels in Aerospace Applications

Layachi

Bennaceur

2017

MATEC Web Conf.

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Abstract. The present work is a proposed optimization model of grid sub-stiffened panels for aerospace applications, having a better knowledge about the stability analysis of conventional grid sub-stiffened panels against loading and different mode of failure occurring lead us thinking about the topology optimization. In a first stage, we will analyse the stability performance of such structures against specific mechanical loading and conclude some techniques to introduce a topology optimization through PSO algorithm of some design variables. The aim is the better exploitation of the sub-stiffened panel along the plan so that the area less stressed due the charging will be extruded in mass for the enhancement of the concept of looking for better performance with a structure already saved in weight.

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EBF3PanelOpt: An optimization framework for curvilinear blade-stiffened panels

Cited by 98 publications

References 17 publications

Generatrix shape optimization of stiffened shells for low imperfection sensitivity

Generatrix shape optimization of stiffened shells for low imperfection sensitivity

EBF3PanelOpt: A Computational Design Environment for Panels Fabricated by Additive Manufacturing

Topology Optimization and Design Guidelines of Sub-Stiffened Panels in Aerospace Applications

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