Structural Design Process Improvement Using Evolutionary Finite Element Models

2006 ◽  
Vol 43 (1) ◽  
pp. 172-181 ◽  
Author(s):  
Robert M. Taylor ◽  
Terrence A. Weisshaar ◽  
Vladimir Sarukhanov
Keyword(s):  
Finite Element ◽  
Design Process ◽  
Process Improvement ◽  
Structural Design ◽  
Finite Element Models

Numerical Investigation on Behaviors of Stiffened Large Suction Cap for Offshore Suction Cofferdam

2020 ◽  
Author(s):  
Jeongsoo Kim ◽  
Yeon-Ju Jeong ◽  
Min-Su Park ◽  
Sunghoon Song
Keyword(s):  
Finite Element ◽  
Structural Design ◽  
Nonlinear Finite Element ◽  
Finite Element Models ◽  
Suction Pressure ◽  
Sheet Pile ◽  
Large Size ◽  
Critical Issues ◽  
Stress And Deformation ◽  
Pile Type

Abstract This study introduces a large offshore cofferdam installed by suction, unlike conventional ones such as a sheet-pile type, and proposes an effective suction cap for the cofferdam. In structural design view of the cofferdam, there are several critical issues due to its large size. This study conducted structural analyses of stiffened caps for large offshore suction cofferdam using fully nonlinear finite element models, and analyzed changes in behaviors of the cap due to stiffener arrangements to provide design insights. For finite element models, the diameter and the thickness of the suction cap (circular plate only) are 20m and 0.07m, respectively. Suction pressure on the cap was assumed to be 100kPa, all parts of the cofferdam except the cap are considered as boundary conditions. By investigating conventional suction anchors, several stiffener arrangement patterns on the cap of suction cofferdam were derived, and each arrangement was estimated by comparing stress and deformation of the cap. Also, reaction distributions on the edge of the cap were investigated to analyze effects of the stiffener arrangement on the interface behaviors between cap and cofferdam.

scholarly journals Structural analysis by interval approach

2008 ◽  
pp. 869-880
Author(s):  
Franck Massa ◽  
Karine Mourier-Ruffin ◽  
Bertrand Lallemand ◽  
Thierry Tison
Keyword(s):  
Sensitivity Analysis ◽  
Finite Element ◽  
Structural Analysis ◽  
Design Process ◽  
Structural Design ◽  
Numerical Models ◽  
Test Case ◽  
Design Phase ◽  
Deterministic Analysis ◽  
Interval Approach

Finite element simulations are well established in industry and are an essential part of the design phase for mechanical structures. Although numerical models have become more and more complex and realistic, the results can still be relatively far from observed reality. Nowadays, use of deterministic analysis is limited due to the existence of several kinds of imperfections in the different steps of the structural design process. This paper presents a general non-probabilistic methodology that uses interval sets to propagate the imperfections. This methodology incorporates sensitivity analysis and reanalysis techniques. Numerical interval results for a test case were compared to experimental interval results to demonstrate the capabilities of the proposed methodology.

Coevolutionary and genetic algorithm based building spatial and structural design

2015 ◽  
Vol 29 (4) ◽  
pp. 351-370 ◽  
Author(s):  
Hèrm Hofmeyer ◽  
Juan Manuel Davila Delgado
Keyword(s):  
Genetic Algorithm ◽  
Finite Element Method ◽  
Finite Element ◽  
Design Process ◽  
Process Simulation ◽  
Structural Design ◽  
The Finite Element Method ◽  
Design Modification ◽  
Spatial Design ◽  
Element Method

AbstractIn this article, two methods to develop and optimize accompanying building spatial and structural designs are compared. The first, a coevolutionary method, applies deterministic procedures, inspired by realistic design processes, to cyclically add a suitable structural design to the input of a spatial design, evaluate and improve the structural design via the finite element method and topology optimization, adjust the spatial design according to the improved structural design, and modify the spatial design such that the initial spatial requirements are fulfilled. The second method uses a genetic algorithm that works on a population of accompanying building spatial and structural designs, using the finite element method for evaluation. If specific performance indicators and spatial requirements are used (i.e., total strain energy, spatial volume, and number of spaces), both methods provide optimized building designs; however, the coevolutionary method yields even better designs in a faster and more direct manner, whereas the genetic algorithm based method provides more design variants. Both methods show that collaborative design, for example, via design modification in one domain (here spatial) to optimize the design in another domain (here structural) can be as effective as monodisciplinary optimization; however, it may need adjustments to avoid the designs becoming progressively unrealistic. Designers are informed of the merits and disadvantages of design process simulation and design instance exploration, whereas scientists learn from a first fully operational and automated method for design process simulation, which is verified with a genetic algorithm and subject to future improvements and extensions in the community.

Research on the Detail Design of Aircraft Wings

2014 ◽  
Vol 472 ◽  
pp. 394-397
Author(s):  
Guo Chun Liu
Keyword(s):  
Finite Element ◽  
Design Process ◽  
Finite Element Methods ◽  
Structural Design ◽  
Buckling Analysis ◽  
Design Approach ◽  
Aircraft Wings ◽  
Detail Design ◽  
Design Requirements

Due to the lack of the wings detail design progress and the limitation of ordinary detail design ways for the complicated design of wings, while a new wing detail design process was proposed based on traditional wing structural design approach, including two parts: the sub-components design and the particular design. The process involves taking loads on initial proofing structure, structural design, FEM (Finite Element Methods) analysis, and buckling analysis, etc. In the particular design, the structural loads were calculated by the corresponding deformation based on the initial proofing design. The detail components are designed based on the new design process which meets to all the design requirements. It shows that the new design process is feasible and available.

Design and optimisation of the external load bearing carry through structure of a columned multi bubble fuselage

2013 ◽  
Vol 117 (1187) ◽  
pp. 97-108
Author(s):  
S. H. Cho ◽  
C. Bil ◽  
R. Adams
Keyword(s):  
Finite Element ◽  
Structural Design ◽  
Membrane Structure ◽  
Finite Element Models ◽  
Design Domain ◽  
Inner Membrane ◽  
And Topology ◽  
Bending Loads ◽  
Design Challenge ◽  
The Given

Abstract The blended wing-body configuration holds a major structural design challenge at the centre-body where the structure must support both wing bending loads and internal cabin pressure. A membrane approach is proposed which decouples the loads to allow their resistance by two independent structures: an inner membrane for cabin pressure and an outer structure to resist wing loads. A columned multi-bubble fuselage is proposed for the inner membrane structure, which are multispherical configuration to efficiently withstand the pressure loads. Considering this configuration, the carry-through structure can be designed and optimised. Finite element results show a significant reduction of stress level in this design over that for a conventional multi-bubble fuselage. Up to 30% weight reduction is achieved for a military cargo application that requires an extensive area with no structural interruption. For the outer carry-through structure, the topology and shape optimisations of finite element models were performed on the given design domain. The results from the shape and topology optimisations were complementary demonstrating a consistent design approach. The optimisation theory is briefly presented along with the results.

scholarly journals Structural design of floodways under extreme flood loading

2020 ◽  
Vol 11 (4) ◽  
pp. 535-555
Author(s):  
Isaac Greene ◽  
Weena Lokuge ◽  
Warna Karunasena
Keyword(s):  
Finite Element ◽  
Design Process ◽  
Structural Design ◽  
Design Guidelines ◽  
Flood Events ◽  
Worst Case ◽  
Content Type ◽  
Design Charts ◽  
Hydraulic Design ◽  
Extreme Flood

Purpose Current methods for floodway design are predominately based on hydrological and hydraulic design principles. The purpose of this paper is to investigate a finite element methods approach for the inclusion of a simplified structural design method into floodway design procedures. Design/methodology/approach This research uses a three-dimensional finite element method to investigate numerically the different parameters, geometric configurations and loading combinations which cause floodway vulnerability during extreme flood events. The worst-case loading scenario is then used as the basis for design from which several structural design charts are deduced. These charts enable design bending moments and shear forces to be extracted and the cross-sectional area of steel and concrete to be designed in accordance with the relevant design codes for strength, serviceability and durability. Findings It was discovered that the analysed floodway structure is most vulnerable when impacted by a 4-tonne boulder, a 900 mm cut-off wall depth and with no downstream rock protection. Design charts were created, forming a simplified structural design process to strengthen the current hydraulic design approach provided in current floodway design guidelines. This developed procedure is demonstrated through application with an example floodway structural design. Originality/value The deduced structural design process will ensure floodway structures have adequate structural resilience, aiding in reduced maintenance and periods of unserviceability in the wake of extreme flood events.

scholarly journals Replacing Detonation by Compressed Balloon Approaches in Finite Element Models

2020 ◽  
Vol 2020 ◽  
pp. 1-16
Author(s):  
Pierre Legrand ◽  
S. Kerampran ◽  
M. Arrigoni
Keyword(s):  
Finite Element ◽  
Energy Balance ◽  
Structural Design ◽  
Ideal Gas ◽  
Finite Element Models ◽  
Arbitrary Lagrangian Eulerian ◽  
Detonation Products ◽  
Blast Effects ◽  
Blast Wave Propagation ◽  
Explosive Event

The evaluation of blast effects from malicious or accidental detonation of an explosive device is really challenging especially on large buildings. Indeed, the time and space scales of the explosion together with the chemical reactions and fluid mechanics make the numerical model really difficult to achieve acceptable structural design. Nevertheless, finite element methods and especially Arbitrary Lagrangian Eulerian (ALE) have been extensively used in the past few decades with some simplifications. Among them, the replacement of the explosive event by a compressed balloon of detonation products has been proven useful in numerous different situations. Unfortunately, the ALE algorithm does not achieve a proper energy balance through the numerical integration of the discrete scheme; this important drawback is not compensated by the use of the classical compressed balloon approach. The paper focuses on increasing the radius of the equivalent ideal gas balloon in order to achieve better energy balance and thus better results at later stages of the blast wave propagation.

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