Advances in numerical ditching simulation of flexible aircraft models

Siemann, Martin; Schwinn, Dominik; Scherer, Julian; Kohlgrüber, Dieter

doi:10.1080/13588265.2017.1359462

Cited by 20 publications

(6 citation statements)

References 16 publications

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“…At DLR, ditching is investigated with numerical computational methods which are favorable in terms of kinematic and structural analysis. In the past, the tool AC-Ditch was developed for the automated pre-processing of FSI (Fluid-Structure Interaction) models for ditching computations with a coupled SPH-FE (Smoothed Particle Hydrodynamics -Finite Element) approach using a proprietary explicit FE code [12]. The integration of functionalities from this tool into the PANDORA environment and required extensions for the automatic generation of generic codeindependent ditching models for calculations with diverse FSI numerical approaches are presented in this section.…”

Section: Framework For the Virtual Structural Analysis Of Aircraft St...mentioning

confidence: 99%

Automatic tool-based pre-processing of generic structural models for water impact simulations in the aircraft pre-design

Muñoz

Petsch

Kohlgrüber

et al. 2022

IOP Conf. Ser.: Mater. Sci. Eng.

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The integration of automated tool capabilities for the generation of models for transient dynamic calculations in the scope of the aircraft pre-design is described in this paper. The Python-based DLR framework PANDORA, initially developed for the modelling and the sizing of aircraft structures in multidisciplinary process chains, is considered for this work. The focus lays on the generation of suitable numerical models for the water impact simulation. To enable this, the internal tool database was extended to consider additional features such as contact definitions, mesh-free formulations, enhanced connection models and specific control options. The generation of the CPACS-based FE aircraft model was extended by means of discretisation and additional structural components. The generation of the water domain was also included according to user defined inputs like pool dimensions, initial conditions and the selection of an appropriate fluid modelling approach. In addition, a feature to launch a simulation directly within the framework was included. Finally, options to retrieve and visualize results from finished water impact simulations were also integrated, allowing to display contour and time history plots.

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Section: Framework For the Virtual Structural Analysis Of Aircraft St...mentioning

confidence: 99%

Automatic tool-based pre-processing of generic structural models for water impact simulations in the aircraft pre-design

Muñoz

Petsch

Kohlgrüber

et al. 2022

IOP Conf. Ser.: Mater. Sci. Eng.

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show abstract

“…Stretchable electronic devices [ 1 ] have exploited wide applications in the fields of aerospace [ 2 , 3 , 4 , 5 ], biomedicine [ 6 , 7 ], intelligent wear [ 8 ], etc., which helps to tackle many challenges in engineering and becomes the research focus at present. There are two approaches to achieve the stretchability of electronic devices.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Behaviors of the Origami-Inspired Horseshoe-Shaped Solar Arrays

et al. 2022

Micromachines

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The importance of flexibility has been widely noticed and concerned in the design and application of space solar arrays. Inspired by origami structures, we introduce an approach to realizing stretchable and bendable solar arrays via horseshoe-shaped substrate design. The structure has the ability to combine rigid solar cells and soft substrates skillfully, which can prevent damage during deformations. The finite deformation theory is adapted to find the analytic model of the horseshoe-shaped structure via simplified beam theory. In order to solve the mechanical model, the shooting method, a numerical method to solve ordinary differential equation (ODE) is employed. Finite element analyses (FEA) are also performed to verify the developed theoretical model. The influences of the geometric parameters on deformations and forces are analyzed to achieve the optimal design of the structures. The stretching tests of horseshoe-shaped samples manufactured by three-dimensional (3D) printing are implemented, whose results shows a good agreement with those from theoretical predictions. The developed models can serve as the guidelines for the design of flexible solar arrays in spacecraft.

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“…In [7] and [8] some problems related to helicopter ditching are examined. The use of computational approaches for the design and certification of aircraft at ditching is of course very attractive, and significant steps forward have been taken recently [9,10,11,12,13]. Nonetheless, a further enhancement of the capabilities of those tools to reproduce both the hydrodynamics and the strong fluid-structure interaction [34], where significant fluid-structure interaction aspects are highlighted.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of the fluid-structure interaction during the water impact of thin aluminium plates at high horizontal speed

Spinosa

Iafrati

2021

International Journal of Impact Engineering

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The water impact of an inclined flat plate and at high horizontal velocity is experimentally investigated with focus on the fluid-structure interaction aspects. Several test conditions have been examined by varying the vertical to horizontal velocity ratio, the pitch angle and the plate thickness. Measurements are performed in terms of strains, loads and local pressure. The study highlights the significant changes in the strains and, more in general, in the structural behaviour when varying the plate stiffness and the test conditions. For some of the test presented, permanent deformation are also found. The strong fluid-structure interaction is analysed by comparing the simultaneous measurements of strains and pressures, and it is shown that the deformation of the plate leads to a reduction of the pressure peak and to a corresponding pressure rise behind it. The variation in the shape of the spray root caused by the structural deformation are discussed based on both pressure measurements and underwater images. Despite the reduction of the pressure peak intensity, it is shown that the structural deformation leads to an increase in the total loading up to 50% for the test conditions examined in this study. It is also observed that in presence of large structural deformations the hydrodynamic loads do not obey to the scaling that works in the case of the thick plates, and some practical conclusions about the scaling of tests in presence of a strong fluid-structure interaction are provided.

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Advances in numerical ditching simulation of flexible aircraft models

Cited by 20 publications

References 16 publications

Automatic tool-based pre-processing of generic structural models for water impact simulations in the aircraft pre-design

Automatic tool-based pre-processing of generic structural models for water impact simulations in the aircraft pre-design

Mechanical Behaviors of the Origami-Inspired Horseshoe-Shaped Solar Arrays

Experimental investigation of the fluid-structure interaction during the water impact of thin aluminium plates at high horizontal speed

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