Efficient virtual reality design of quiet underwater shells

Akl, W.; Baz, A.

doi:10.1007/s10055-005-0004-4

Cited by 3 publications

(1 citation statement)

References 24 publications

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“…A detailed derivation of the stiffness and mass matrices for the acoustic cavity elements as well as the coupling matrix is conducted by Akl and Baz [29], where the following identities are defined:…”

Section: Fluid-structure Interaction Problemmentioning

confidence: 99%

Topology Optimization of Fluid-Loaded Shells by Minimizing the Acoustic Coupling to the Fluid Domain

Akl

2010

Int. J. for Computational Methods in Eng. Sc. & Mech.

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Topology optimization of fluid-loaded shells is presented. A finite element model with shallow shell elements is developed using strain-based formulation. The considered elements are quadrilateral, where each node has five degrees of freedom to account for in-plane and out-of-plane deflections as well as rotations. The developed model was integrated in the optimization algorithm aiming at minimizing the coupling between the flexible shell and the adjacent fluid domain. The model is exercised to generate closed-form expressions of the sensitivities in order to enhance the topology optimization process. The Method of Moving Asymptotes is used along with the sensitivity expressions to predict the successive iterations. The fluid-structure coupling was manifested in the coupling matrix in the finite element model. The results of the finite element-based topology optimization were validated using ANSYS R commercial package. Radial loads with fixed-fixed as well as axial loads with fixed-free boundary conditions were implemented. Different values of minimum permissible shell wall thickness were developed. Numerical examples show that considerable attenuations are attained for the selected structural modes in the order of 9-12 dB for the radial as well as the axial excitation cases. Reducing the minimum permissible thickness from 35% of the original thickness to 15% has shown tremendous effect on the attenuation at the targeted modes for the different load cases in the order of 12 dB.The presented model and design methodology can be invaluable in the design of various critical cylindrical structures that must satisfy strict vibration and noise radiation requirements.A fluid-structure boundary area A e surface area for structure finite element c sonic speed in the acoustic medium

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Section: Fluid-structure Interaction Problemmentioning

confidence: 99%

Topology Optimization of Fluid-Loaded Shells by Minimizing the Acoustic Coupling to the Fluid Domain

Akl

2010

Int. J. for Computational Methods in Eng. Sc. & Mech.

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A virtual reality simulation for coordination and interaction based on dynamics calculation

Duan

Sun

et al. 2017

Ships and Offshore Structures

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Augmented Reality on Long-wall Face for Unmanned Mining

Zhang¹

2011

JCP

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<p>An unmanned mining technology for the fully mechanized longwall face automation production is proposed and studied. The essential technology will bring the longwall face production into visualization through the VR (Virtual Reality) and AR (Augmented Reality) combination. Based on the visual theoretical model of the longwall face, the combination of virtual and reality, the real-time interactive and the 3D registration function were realized. The 3D image of the longwall face may be scaled and viewed from free angles. Using the overall affine coordinate system, the stereoscopic impression for the longwall face was enhanced; the video image is matched to 3D characteristics; the occlusion issue is resolved with the depth information solution; and the simplification visualization interactive method is proposed. The Key technology and Alpha channel are used to the combination of the real longwall face and the virtual user.</p>

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Efficient virtual reality design of quiet underwater shells

Cited by 3 publications

References 24 publications

Topology Optimization of Fluid-Loaded Shells by Minimizing the Acoustic Coupling to the Fluid Domain

Topology Optimization of Fluid-Loaded Shells by Minimizing the Acoustic Coupling to the Fluid Domain

A virtual reality simulation for coordination and interaction based on dynamics calculation

Augmented Reality on Long-wall Face for Unmanned Mining

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