Deflection measuring system for floating dry docks

Korotaev, Valery V.; Pantiushin, Anton V.; Serikova, Mariya G.; Anisimov, Andrei G.

doi:10.1016/j.oceaneng.2016.03.012

Cited by 32 publications

(6 citation statements)

References 20 publications

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“…Floating dikes, in turn, are used specifically for vessels that have been damaged in the middle of the sea or any type of operation. Korotaev, Pantiushin, Serikova and Anisimov (2016) say in his work that this docking method uses a U-shaped structure that, filled with water, submerges the dike helping the vessel dock. Once the vessel is protected and brought into the repair area, water is pumped out of the structure, causing the dike to rise and expose underwater parts of the vessel.…”

Section: Other Types Of Dry-dockingmentioning

confidence: 99%

Comparative study for naval repairs using longitudinal slipway or airbags

et al. 2021

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Ship repair has gained prominence as a service offered at the shipyards following a crisis in the shipbuilding industry, which has seen a fall in demand for new constructions, causing many companies in the sector to stall, especially shipyards. For a repair yard to be economically viable, in times of crisis, cost reduction is essential to make a sustainable business, so this comparative study aims to check the technical and economic feasibility of this change in the type of dry-docking. The present work deals with a comparative study between the use of the longitudinal slipway and the airbags for dry-docking and repair of river barges. The study sought to identify data from the vessels used for this project, to verify the average displacement of these vessels to analyze the airbags' carrying capacity, as well as the size of the winch to perform the dry-docking service. Since most repair yards use leased areas, the flexibility achieved with the use of airbags, as well as the reduced need for investments in the area, are benefits provided by using them. This work presented satisfactory results for the use of river barge docking airbags as a competitive alternative in repair services.

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Section: Other Types Of Dry-dockingmentioning

confidence: 99%

Comparative study for naval repairs using longitudinal slipway or airbags

et al. 2021

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“…Valery V. et al [9] in their article detailed different deflection measuring systems on floating structures. They developed a camera-based system and gave insight to the various deflections occurring on the floating pontoons and dry docks.…”

Section: Literature Reviewmentioning

confidence: 99%

Analysis and Design of Steel a Floating Pontoon Jetty for Use in the Coastal Waters of Nigeria

Igwe¹,

Ajoko²

2020

EJERS

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Floating pontoons are semi-permanently moored structures on a water body to provide boarding access to commuters. The decision to develop such structures was informed by the need to provide berthing access to river crafts that operate on the coastal waters of Bayelsa State, Nigeria. In this project, a floating pontoon, a gangway, and other supporting structures like scantlings and spud pillars, were designed to meet the needs and environmental requirements of the area. Standards consulted are the DNV Rules for the classification of ships; DNV Rules for the classification of Floating Docks; ABS Rules for Building and Classing Steel Barges; and other relevant Nigeria and Imo standards. The pontoon designed has dimensions: 13 x 12 x 4.8 m; gross tonnage of 15 tonnes; 2nos. of dry tanks of capacity 17.2 m³ and 6nos. of manholes of 450 x 550 mm. The strength of materials analysis was limited to the floating pontoon for limitations of space for this paper. The pontoon and scantling design has been done based on the worst condition of design pressure which is for the maximum submersion draft. Normal grade steel of yield strength 235 MPa is chosen for all members except the pontoon girders, frames and pillars. This is to reduce the material scantlings and to ensure higher strength with lesser scantlings. Longitudinal framing is adopted in the pontoons as the pontoon structure needs more strength in the longitudinal direction.

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“…В настоящее время используют два вида систем измерения прогиба плавучих доков: сенсорные, измеряющие локальные деформации в точках, привязанных к отдельным элементам дока [5][6][7][8][9], и оптико-электронные, определяющие взаимные смещения частей дока относительно его базовых конструкционных осей [10][11][12][13][14]. В соответствии с международными правилами безопасности док-станция должна быть оснащена как минимум двумя системами измерения отклонения, основанными на различных физических принципах измерения [15][16][17][18].…”

Section: Introductionunclassified

Rotation parameter estimation error of deflectometer basic unit

Phuong¹,

Gorbachev²,

Konyakhin³

et al. 2019

Naučno-teh. vestn. inf. tehnol. meh. opt.

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Предмет исследования. Рассмотрен способ определения параметров поворота базового блока оптико-электронного прогибомера, влияющих на погрешность определения прогиба крупногабаритного объекта типа плавучего дока. Метод. С помощью элементов векторной алгебры и матричного анализа предложены алгоритм и структура математической модели влияния погрешности определения координат изображения коллимационной марки объекта на погрешность определения параметров поворота базового блока прогибомера. Основные результаты. Доказана возможность определения параметров поворота базового блока в результате решения систем нелинейных уравнений на основе алгоритма оптимизации Левенберга-Марквардта. Исследования на математической модели позволили оценить влияние погрешности определения координат изображения коллимационной марки объекта на параметры поворота базового блока. Практическая значимость. Полученные результаты данной работы позволят разработать алгоритм компенсации параметров поворота базового блока вследствие влияния внешних факторов и в результате-уменьшить погрешность определения пространственных координат контролируемого объекта (прогиба плавучего дока). Ключевые слова параметры поворота, оптико-электронный прогибомер, базовый блок, векторная алгебра, матричный анализ, погрешность измерения

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Deflection measuring system for floating dry docks

Cited by 32 publications

References 20 publications

Comparative study for naval repairs using longitudinal slipway or airbags

Comparative study for naval repairs using longitudinal slipway or airbags

Analysis and Design of Steel a Floating Pontoon Jetty for Use in the Coastal Waters of Nigeria

Rotation parameter estimation error of deflectometer basic unit

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