Deflection and inclination measuring system for floating dock based on wireless networks

Yang, Ge; Liang, Hua; Wu, Chao

doi:10.1016/j.oceaneng.2013.05.014

Cited by 18 publications

(6 citation statements)

References 9 publications

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“…3. Определяются значения параметров поворота ББ η j , χ j , φ j (j = 1..N) решением системы нелинейных уравнений (9). Для решения систем нелинейных уравнений используется алгоритм оптимизации Левенберга-Марквардта с начальным приближением (η 0 , χ 0 , φ 0 ) = (0, 0, 0).…”

Section: анализ погрешности определения параметров поворота базового unclassified

“…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

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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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Section: анализ погрешности определения параметров поворота базового unclassified

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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“…Among them, the ship motion measurement technology of the two degrees of freedom of ship roll and pitch is very mature, mainly using angle sensors, inclination gyroscopes, and other equipment as effective means of real-time measurement [8]. The heave displacement measurement of a ship is still the main difficulty in ship motion measurement.…”

Section: Introductionmentioning

confidence: 99%

An Absolute Displacement Measurement Method and Its Application in Ship Motion Measurement

Han

2023

JMSE

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Due to the fact that there is no static reference point in ocean space, relative measurement sensors such as laser sensors cannot be applied to the measurement of ship motion. In order to collect the motion signal of a ship in the ocean more accurately, an absolute measurement method for the motion of a ship is proposed. Firstly, the acceleration signal in the heave direction of the ship is obtained by using an acceleration sensor; secondly, the time–frequency domain integration algorithm is used to avoid the problem of the quadratic trend item and the influence of the low-frequency signal, and the ship’s heave displacement value is obtained by integration; finally, the displacement signal measured by the laser sensor and the integrated displacement signal of the acceleration sensor are compared with each other to verify the effectiveness of the absolute measurement of the heave displacement of the ship based on the acceleration sensor. At the same time, an angle sensor is used to measure the roll angle and pitch angle in the motion of the ship, form an absolute measurement system for the motion of the ship, and verify that the measurement points are arranged on the ship, which proves that the system can collect data from the ship in sea areas far from the coast. Motion signals are more advantageous.

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“…WSN can be widely used in the areas such as remote monitoring, logistics, construction, underwater environment, 4 surveillance, home security, agriculture, 5 and structural health monitoring. 6,7 In the construction engineering, WSN is employed to monitor the work status of construction mechanism devices and provide the information exchange for the workers. One of the applications in high-rise construction scenario is the wireless paging network (WPN) in a construction hoist.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A wireless paging network with load-balancing equal opportunity routing in high-rise building construction

Yang

Liang

2018

International Journal of Distributed Sensor Networks

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The energy consumption of nodes is strictly limited in wireless sensor networks. The traditional direct delivery routing protocol is employed in the paging network of high-rise building construction elevators, which results in the high energy consumption and low successful delivery rate. A load-balancing equal opportunity routing protocol for wireless paging network is proposed in this work. The load-balancing equal opportunity routing protocol is a data transfer technique which maintains the network survivability by selecting the optimal path with both the lower energy consumption and the balanced network load. A load-balancing scheme gives equal opportunities for package transmission. A pager node delivers the packages by selecting a neighbor node with higher energy. The neighbor nodes in the coverage of the source node have an equal opportunity for routing. The sink node in the paging network broadcasts routing messages when moving along the track during the path selecting. The proposed load-balancing equal opportunity routing protocol is implemented and evaluated in a high-rise building construction elevator. The experimental results show that the average energy consumption of nodes is lowered with a balanced network load. It is estimated that successful delivery rate is increased by 55% but with a higher latency, and the network lifetime is prolonged.

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Deflection and inclination measuring system for floating dock based on wireless networks

Cited by 18 publications

References 9 publications

Rotation parameter estimation error of deflectometer basic unit

Rotation parameter estimation error of deflectometer basic unit

An Absolute Displacement Measurement Method and Its Application in Ship Motion Measurement

A wireless paging network with load-balancing equal opportunity routing in high-rise building construction

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