Abstract
A concept design methodology for monotonous, tapered thin-walled structures (wing/fuselage/ship/bridge) is presented including modules for: model generation; loads; primary (longitudinal) and secondary (transverse) strength calculations; structural feasibility (buckling/fatigue/ultimate strength criteria); design optimization modules based on ES/GA/FFE; graphics. A method for primary strength calculation is presented in detail. It provides the dominant response field for design feasibility assessment. Bending and torsion of the structure are modelled with the accuracy required for concept design. A ‘2.5D-FEM’ model is developed by coupling a 1D-FEM model along the ‘monotonity’ axis and a 2D-FEM model(s) transverse to it. The shear flow and stiffness characteristics of the cross-section for bending and pure/restrained torsion are given, based upon the warping field of the cross-section. Examples: aircraft wing and ship hull.
Highlights
IntroductionThe concept design methodology for monotonous, tapered, thin-walled structures (wing/fuselage/ship/bridge) is presented
The concept design methodology for monotonous, tapered, thin-walled structures is presented
It contains: (A) response and feasibility analysis modules (FIN-CREST), (B) decision making-synthesis modules (DeMak) and (C) interaction/visualization programs (MAESTRO MM/MG and DeVIEW) that irerate in the design cycle
Summary
The concept design methodology for monotonous, tapered, thin-walled structures (wing/fuselage/ship/bridge) is presented. The problem solution is based on the OCTOPUS program [1, 2] It contains: (A) response and feasibility analysis modules (FIN-CREST), (B) decision making-synthesis modules (DeMak) and (C) interaction/visualization programs (MAESTRO MM/MG and DeVIEW) that irerate in the design cycle. Modules 6 and 7c (GAZ) are used for calculating the sensitivity of the structural response with respect to the design variables, based on the global strength module FIN/LTOR [7]. Constraints: User given Minimal dimensions Library of criteria (see 4) Objectives: minimal weight, minimal cost, maximal safety Decision making procedure using a) Global MODM optimization program GLO b) Local MADM optimization module LOC c) Coordination module GAZ a) VB Environment, b) Program MG, c) DeVIEW graphic tool
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