Design and development remotely operated vehicle for anode ship hull inspection

Introduction. Nowadays ship hull diagnostics is carried out in dry-dock or using divers in the road. The both technologies are time consuming, labour and material resource demanding. Specialists from Bauman Moscow State Technical University have developed a diagnostics system that allows the ship hull underwater part inspection to be performed without calling at dry-dock and without divers. The system includes the following main elements: remotely operated vehicle that contains diagnostics tools; hydro acoustic navigation system; software; and diagnostics technology. Method. The technology is based on an acoustic method of non-destructive testing (NDT). SH-waves with elastic vibrations excitation by non-contact method are used without necessity of thorough surface preparation before testing. SH-waves are also used for flaw detection within damaged areas (areas of different thicknesses). As the research has shown, the mirror-shadow technique with bottom signal attenuation as a criterion for corrosion crack detection is most effective. The minimum detectable deep of the corrosion cracks is 1.5–2 mm. The proposed diagnostics technology uses electromagnetic acoustic transducers (EMAT) with a 5 MHz frequency. Results. The diagnostics system was successfully tested in the pool. The test results confirmed the system’s ability to perform automatic metal diagnostics with wall thickness measurements and defect detection within areas of corrosion. Discussions. Nowadays the system is under the process of Russian Maritime Register of Shipping approval. It is planned to develop a system with arc welding tools for underwater objects repair. Prospects of diagnostics system usage for the various underwater steel structures including ones located on the Russian Federation Arctic shelf are under consideration.

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Design and Development of Auto Depth Control Of Remotely Operated Vehicle using Thruster System

JOURNAL OF MECHANICAL ENGINEERING AND SCIENCES ◽

10.15282/jmes.7.2014.13.0111 ◽

2014 ◽

Vol 7 ◽

pp. 1141-1149

Author(s):

F.A. Ali ◽

M.S.M. Aras ◽

F.A. Azis ◽

M.F. Sulaima ◽

I. Jaaffar

Keyword(s):

Design And Development ◽

Remotely Operated Vehicle ◽

Depth Control

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The Use of a UVC Lamp Incorporated With an ROV to Prevent Biofouling: A Proof-of-Concept Study

Marine Technology Society Journal ◽

10.4031/mtsj.54.5.9 ◽

2020 ◽

Vol 54 (5) ◽

pp. 76-83

Author(s):

Cierra Braga ◽

Kelli Hunsucker ◽

Caglar Erdogan ◽

Harrison Gardner ◽

Geoffrey Swain

Keyword(s):

Ship Hull ◽

Proof Of Concept ◽

Remotely Operated Vehicle ◽

Biofilm Growth ◽

Concept Study ◽

Fouling Release ◽

Ultraviolet C

AbstractA proof-of-concept study was designed to investigate using an Ultraviolet C (UVC) lamp mounted on a hull-crawling remotely operated vehicle (ROV) to prevent biofouling on a ship hull. A wheeled cart with a UVC lamp was built to expose two large test panels to UVC. The test panels were coated with an ablative copper antifouling and a silicone fouling release coating, and these were immersed in seawater at Port Canaveral, Florida. Three exposure frequencies (once a week, twice a week, and three times a week) and two dosages (8 and 16 s of UVC exposure) were tested. UVC was effective at preventing biofilm growth during the first 2 weeks of UVC treatment but was unable to prevent increased fouling growth as time progressed. It appears that an increase in UVC intensity and duration of exposure would be needed to prevent fouling growth especially during high-fouling seasons or that UVC exposure would need to be combined with another fouling prevention practice, such as mechanical wiping, to be more effective.

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