Alumina Ceramic 3.6 in Flotation Spheres for 11 Km ROV/AUV Systems

Weston, Sally; Stachiw, J. D.; Merewether, Ray; Olsson, Mårten; Jemmott, G.F.

doi:10.1109/oceans.2005.1639757

Cited by 20 publications

(7 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This vehicle utilised 1472 spheres with an OD of 91 mm, producing a net buoyancy of 417 kg [28]. These spheres were developed by Deepsea Power & Light [29].…”

Section: Buoyancymentioning

confidence: 99%

Inspection-Class Remotely Operated Vehicles—A Review

Capocci

Dooly

Omerdić

et al. 2017

JMSE

182

View full text Add to dashboard Cite

This paper presents a review of inspection-class Remotely Operated Vehicles (ROVs). The review divides the classification of inspection-class ROVs; categorising the vehicles in order of size and capability. A state of the art technology review is undertaken, discussing various common subsystems of the ROV. Standard and novel ROV shapes and designs are reviewed, with emphasis on buoyancy, frame materials and hydrodynamics. Several power considerations and designs are discussed, accounting for battery fed and mains fed systems. ROV telemetry is split into a discussion on the various transmission hardware systems and the communication protocols that are most widely used in industry and research today. A range of thruster technologies is then introduced with consideration taken of the various thruster architectures available. Finally, the navigation and positioning sensors employed for ROV navigation and control are reviewed. The author has also created a number of comparison tables throughout the review; tables include comparison of wired data transmission technology, comparison of common ROV communication protocols and comparisons of various inertial navigation systems. By the end of the review the reader will have clearer understanding on the fundamentals of inspection-class ROV technologies and can use this as an introduction to further paper investigation.

show abstract

“…This vehicle utilised 1472 spheres with an OD of 91 mm, producing a net buoyancy of 417 kg [28]. These spheres were developed by Deepsea Power & Light [29].…”

Section: Buoyancymentioning

confidence: 99%

Inspection-Class Remotely Operated Vehicles—A Review

Capocci

Dooly

Omerdić

et al. 2017

JMSE

182

View full text Add to dashboard Cite

show abstract

“…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

View full text Add to dashboard Cite

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.

show abstract

“…In addition, the selection of the material of the optical element should take into account: resistance to the chemical effects of seawater; the requirements for optical components, namely, high transparency in the spectral range used, the possibility of using known technologies for processing optical materials both for obtaining transparent surfaces (grinding hardness) and for imparting the required shape. Studies on this topic are presented in papers [1][2][3][4][5][6][15][16][17].…”

Section: Introductionmentioning

confidence: 99%