Integrated Aerodynamic/Structural/Dynamic Analyses of Aircrafts with Large Shape Changes

Abstract Origami designs have attracted significant attention from researchers seeking to develop new types of deployable structures due to their ability to undergo large and complex yet predictable shape changes. The Kresling pattern, which is based on a natural accumulation of folds and creases during the twist-buckling of a thin-walled cylinder, offers a great example for the design of deployable systems that expand uniaxially into tubes or booms. However, much remains to be understood regarding the characteristics of Kresling-based deployable systems, and their dynamics during the deployment process remain largely unexplored. Hence this research investigates the deployment of Kresling origami-inspired structures, employing a full six-degree-of-freedom truss-based model to study their dynamics under different conditions. Results show that tuning the initial rotation angle of a structure gives rise to several qualitatively distinct mechanical properties and stability characteristics, each of which has different implications for the design of the deployable systems. Dynamic analyses reveal the robustness of Kresling structures to out-of-axis perturbations while remaining compliant in the axial direction. These findings suggest that Kresling-based designs can form the basis for the development of new types of deployable structures and systems with tunable performance.

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High-speed visualization of time-varying data in large-scale structural dynamic analyses with a GPU

Automation in Construction ◽

10.1016/j.autcon.2014.02.020 ◽

2014 ◽

Vol 42 ◽

pp. 90-99 ◽

Cited By ~ 1

Author(s):

Zhen Xu ◽

Xinzheng Lu ◽

Hong Guan ◽

Aizhu Ren

Keyword(s):

High Speed ◽

Large Scale ◽

Time Varying ◽

Structural Dynamic ◽

Dynamic Analyses

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Analysis of Spent Nuclear Fuel Multipurpose Canister Dynamics During Rail Transportation

Volume 8: Operations, Applications, and Components ◽

10.1115/pvp2020-21705 ◽

2020 ◽

Author(s):

Kevin Kadooka ◽

Nicholas Klymyshyn

Keyword(s):

Nuclear Fuel ◽

Degrees Of Freedom ◽

Spent Nuclear Fuel ◽

The United States ◽

Department Of Energy ◽

Rail Transportation ◽

Element Analysis ◽

Structural Dynamic ◽

Loading Direction ◽

Dynamic Analyses

Abstract The primary mode of spent nuclear fuel transportation within the United States will be by railcar. One such system is the Atlas railcar, which is designed to transport 17 different spent nuclear fuel cask systems, including bare fuel systems and canister fuel systems. In the latter configuration, multipurpose canisters containing spent nuclear fuel may be placed within an overpack for storage, or within a cask for transportation. Compared to bare fuel systems, canister fuel systems have additional degrees of freedom for motion during transportation, because clearance between the cask and canister allows for some motion of the canister to occur relative to the cask. This work investigates the effect of canister motion on the shock and vibration imparted to the spent nuclear fuel within. Structural dynamic analyses have been conducted to identify the effects of canister to cask clearance, presence and type of dunnage, and loading direction and frequency. This modeling study calculates anticipated cask motion, canister motion, and spent nuclear fuel structural dynamic response to normal conditions of transportation railcar motion using finite element analysis methods that were developed to model the rail segment of the ENSA/DOE (Equipos Nucleares S.A., U.S. Department of Energy) multimodal transportation test of 2017.

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Design of Structures That Adapt to Loads through Large Shape Changes

Journal of Structural Engineering ◽

10.1061/(asce)st.1943-541x.0002604 ◽

2020 ◽

Vol 146 (5) ◽

pp. 04020068 ◽

Cited By ~ 6

Author(s):

Arka P. Reksowardojo ◽

Gennaro Senatore ◽

Ian F. C. Smith

Keyword(s):

Shape Changes ◽

Large Shape

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Automatic shape optimization of three-dimensional shell structures with large shape changes

Computers & Structures ◽

10.1016/0045-7949(93)90135-z ◽

1993 ◽

Vol 49 (1) ◽

pp. 167-178 ◽

Cited By ~ 19

Author(s):

A.A. Gates ◽

M.L. Accorsi

Keyword(s):

Shape Optimization ◽

Three Dimensional ◽

Shell Structures ◽

Shape Changes ◽

Large Shape

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Shape Memory Alloy Morphing Airfoil Sections

Advances in Science and Technology ◽

10.4028/www.scientific.net/ast.101.112 ◽

2016 ◽

Vol 101 ◽

pp. 112-120

Author(s):

Dimitris Saravanos ◽

Theodoros Machairas ◽

Alex Solomou ◽

Anargyros Karakalas

Keyword(s):

Shape Memory ◽

Geometrical Nonlinearity ◽

Turbine Blades ◽

Aerodynamic Load ◽

Weight Restrictions ◽

Wind Turbine Blades ◽

Structural Shape ◽

Single Target ◽

Shape Changes ◽

Large Shape

Shape memory alloys (SMA) provide common solid state actuators with reliable and unique characteristics. Their special behavior is based on a reversible phase transformation and can provide high power density, induced strain and block force which render them indispensable for use in morphing structures that require large shape changes while space and weight restrictions are imposed. Yet, their implementation into morphing structures faces challenges related to their complex multi-disciplinary behavior, their interaction with the passive structural components, geometrical nonlinearity due to large shape changes, the lack of experimental data, and above all, the lack of modelling tools which can robustly simulate the complex thermomechanical behavior and make feasible their design. We briefly review the material characterization process, the developed modelling tools which can simulate the complex thermomechanical response of morphing structures with SMA actuators which can undergo large shape changes under severe geometric nonlinearity, and the testing of prototype morphing components. The design and validation of two morphing structural concepts for curvature control are presented. A morphing strip capable to deform towards a single target shape is initially presented. Subsequently, a morphing airfoil concept implementing an articulated mechanism capable to achieve multiple target shapes for aerodynamic load control is presented. The challenging task to continuously adapt the structural shape to time varying demands, dictates the use of antagonistic actuator configurations to maximize and control the range of morphing. The previously mentioned morphing airfoil configuration is used to alleviate the aerodynamic fatigue loads in wind turbine blades and aircraft wings.

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