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Fluid Structure Interaction and Morphing Ocean Structure Deployment
Title
Fluid Structure Interaction and Morphing Ocean Structure Deployment.
Creator
Li, Yanjun, Su, Tsung-Chow, Graduate College
Abstract/Description
As human explore deeper into ocean, more and more subsea structures need to be installed. Deployable structures, a folded package which could be drop from surface and at destination morphing into its final structure form have significant advantages like its counterpart in space structures. More recently, many space missions have proposed large inflatable structure for different proposes. In lieu of the difference between outer space and underwater environment, it is necessary to include the...
Show moreAs human explore deeper into ocean, more and more subsea structures need to be installed. Deployable structures, a folded package which could be drop from surface and at destination morphing into its final structure form have significant advantages like its counterpart in space structures. More recently, many space missions have proposed large inflatable structure for different proposes. In lieu of the difference between outer space and underwater environment, it is necessary to include the fluid structure interaction in underwater deployable inflatable structures application to study the effect of dense liquid environment on the inflating dynamics of ocean structures. The purpose for the present research is to demonstrate, through a numerical simulation and a small scale water tank test, a Deployable Structure for Intervention on Oil Seeps DISIOS, which could form an underwater dome and collect lower density chemicals from oil seep. DISIOS prototype are formed by membranes and inflatable tubes, where tubes act as framework to support the membranes to construct a dome. The study begin with simulate water injection into flatted structures to verify the ability of LS-Dyna software. Deflection and velocity of membranes are recorded to compare with experiment data. Then we turned to inflate process of folded structure by different folded methods. From unfolding process simulation, we could determine which type of fold method works best for our predesign shape of tube. We are now conducting the dynamic analysis of inflatable tube, which is the elementary component of DISIOS framework.
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Date Issued
2015
PURL
http://purl.flvc.org/fau/fd/FA00005896
Format
Document (PDF)
Numerical simulations of a horizontal axis water turbine designed for underwater mooring platforms
Title
Numerical simulations of a horizontal axis water turbine designed for underwater mooring platforms.
Creator
Tian, Wenlong, Song, Baowei, VanZwieten, James H., Pyakurel, Parakram, Li, Yanjun
Date Issued
2016-01
PURL
http://purl.flvc.org/fau/fd/FAUIR000223
Format
Citation
Design and Deployment Analysis of Morphing Ocean Structure
Title
Design and Deployment Analysis of Morphing Ocean Structure.
Creator
Li, Yanjun, Su, Tsung-Chow, Florida Atlantic University, College of Engineering and Computer Science, Department of Ocean and Mechanical Engineering
Abstract/Description
As humans explore greater depths of Earth’s oceans, there is a growing need for the installation of subsea structures. 71% of the earth’s surface is ocean but there are limitations inherent in current detection instruments for marine applications leading to the need for the development of underwater platforms that allow research of deeper subsea areas. Several underwater platforms including Autonomous Underwater Vehicles (AUVs), Remote Operated Vehicles (ROVs), and wave gliders enable more...
Show moreAs humans explore greater depths of Earth’s oceans, there is a growing need for the installation of subsea structures. 71% of the earth’s surface is ocean but there are limitations inherent in current detection instruments for marine applications leading to the need for the development of underwater platforms that allow research of deeper subsea areas. Several underwater platforms including Autonomous Underwater Vehicles (AUVs), Remote Operated Vehicles (ROVs), and wave gliders enable more efficient deployment of marine structures. Deployable structures are able to be compacted and transported via AUV to their destination then morph into their final form upon arrival. They are a lightweight, compact solution. The wrapped package includes the deployable structure, underwater pump, and other necessary instruments, and the entire package is able to meet the payload capability requirements. Upon inflation, these structures can morph into final shapes that are a hundred times larger than their original volume, which extends the detection range and also provides long-term observation capabilities. This dissertation reviews underwater platforms, underwater acoustics, imaging sensors, and inflatable structure applications then proposes potential applications for the inflatable structures. Based on the proposed applications, a conceptual design of an underwater tubular structure is developed and initial prototypes are built for the study of the mechanics of inflatable tubes. Numerical approaches for the inflation process and bending loading are developed to predict the inflatable tubular behavior during the structure’s morphing process and under different loading conditions. The material properties are defined based on tensile tests. The numerical results are compared with and verified by experimental data. The methods used in this research provide a solution for underwater inflatable structure design and analysis. Several ocean morphing structures are proposed based on the inflatable tube analysis.
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Date Issued
2016
PURL
http://purl.flvc.org/fau/fd/FA00004752, http://purl.flvc.org/fau/fd/FA00004752
Subject Headings
Air-supported structures--Design and construction., Remote submersibles--Design and construction., Tensile architecture., Fluid mechanics., Structural dynamics., Ocean engineering., Adaptive control systems.
Format
Document (PDF)