Ceramic External Pressure Housings for Deep Sea Vehicles

Stachiw, J. D.; Peters, Donald B.; Mcdonald, G.

doi:10.1109/oceans.2006.306971

Cited by 20 publications

(8 citation statements)

References 2 publications

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“…An upper titanium housing encases the system computers, the power distribution system, and the inertial navigation system in a one-atmosphere environment. The lower housing is a 11,000m depth-rated ceramic housing [19] containing lithium-ion batteries developed at WHOI [11]. The batteries provide 13.5kWh and power a 50 volt bus that is distributed to the vehicle using a power distribution system located in the upper housing and oil-filled junction boxes.…”

Section: A the Autonomous Benthic Explorermentioning

confidence: 99%

Assessing the deepwater horizon oil spill with the sentry autonomous underwater vehicle

Kinsey

Yoerger

Jakuba

et al. 2011

2011 IEEE/RSJ International Conference on Intelligent Robots and Systems

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This paper reports the Sentry autonomous underwater vehicle and its deployment on two cruises in response to the Deepwater Horizon oil spill. The first cruise, in June 2010, coupled Sentry with the TETHYS mass spectrometer to track and localize a subsea hydrocarbon plume at a depth of approximately 1100m going at least 30km from the oil spill site. In December 2010, Sentry mapped and photographed deep-sea biological communities for follow-up observations and sampling with the Alvin manned submersible. These cruises demonstrate how robots and novel sensing technologies contributed to the oil spill assessment and the broader impact of technologies developed for basic research.

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Section: A the Autonomous Benthic Explorermentioning

confidence: 99%

Assessing the deepwater horizon oil spill with the sentry autonomous underwater vehicle

Kinsey

Yoerger

Jakuba

et al. 2011

2011 IEEE/RSJ International Conference on Intelligent Robots and Systems

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“…Two state-of-the-art rechargeable lithium ion battery systems are compared in Table 5.1. The Alvin II battery system uses a titanium pressure housing (rated to 6,500 m), whereas the smaller Sentry system uses an alumina ceramic housing (rated to 11,000 m, made of 96% AL 2 O 3 ) [21]. Both systems are negatively buoyant, and thus require flotation to be neutrally buoyant.…”

Section: Chapter 5 Future System Designmentioning

confidence: 99%

Variable buoyancy system metric

Jensen¹

2009

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Over the past 20 years, underwater vehicle technology has undergone drastic improvements, and vehicles are quickly gaining popularity as a tool for numerous oceanographic tasks. Systems used on the vehicle to alter buoyancy, or variable buoyancy (VB) systems, have seen only minor improvements during the same time period. Though current VB systems are extremely robust, their lack of performance has become a hinderance to the advancement of vehicle capabilities.This thesis first explores the current status of VB systems, then creates a model of each system to determine performance. Second, in order to quantitatively compare fundamentally different VB systems, two metrics, β m and β vol , are developed and applied to current systems. By determining the ratio of performance to size, these metrics give engineers a tool to aid VB system development. Finally, the fundamental challenges in developing more advanced VB systems are explored, and a couple of technologies are investigated for their potential use in new systems.

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“…Ceramic materials have a great advantage as deep-sea pressure-resistant materials because of their high compressive strength-to-weight ratio relative to high-strength steels and titanium alloys. Alumina (Al 2 O 3 ) ceramics were first used to produce hollow spheres as buoyancy modules [1,2,3] and external pressure housings for deep-sea vehicles [4]. However, compared to silicon nitride (Si 3 N 4 ) ceramics (see in Table 1), Al 2 O 3 ceramics are not the best choice in terms of high compressive strength and low density.…”

Section: Introductionmentioning

confidence: 99%

Additive Manufacturing of Silicon Nitride Ceramic Floatation Spheres with Excellent Mechanical Properties

Zhang

et al. 2019

Materials

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Silicon nitride (Si3N4) ceramic materials are increasingly being used in deep-sea pressure-resistant applications because of their high compressive strength-to-weight ratio. In the present study, Si3N4 ceramic floatation spheres with an outer diameter of approximately 101 mm are successfully batch produced and evaluated. The implementation method was to prepare Si3N4 ceramic hemispherical housings and pair them together. In order to improve the safety of the joint, the hemispherical Si3N4 housings were gradually thickened from 1.80 to 2.50 mm at the equator near the joining surface, based on a 3D model with additive manufacturing technology. The weight-to-displacement ratio of the prepared floatation sphere is approximately 0.34 g/cm3. The flexural strength, compressive strength of the material and the collapse strength of a number of Si3N4 floatation spheres were tested to be 1150, 3847, and 205 MPa, respectively, to confirm the reliability of the process. Additional sustained and cyclic hydrostatic pressure tests simulating the full ocean depth working conditions are carried out on several Si3N4 floatation spheres, which perform very well and do not fail.

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Ceramic External Pressure Housings for Deep Sea Vehicles

Cited by 20 publications

References 2 publications

Assessing the deepwater horizon oil spill with the sentry autonomous underwater vehicle

Assessing the deepwater horizon oil spill with the sentry autonomous underwater vehicle

Variable buoyancy system metric

Additive Manufacturing of Silicon Nitride Ceramic Floatation Spheres with Excellent Mechanical Properties

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