• Title/Summary/Keyword: Salvage crane

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A Structural Response Estimation and Response Amplitude Operator of Floating Type Salvage Crane (부유식 인양크레인의 운동응답특성과 구조응답 평가)

  • Oh, Young-Cheol;Gim, Ok-Sok;Lee, Gyoung-Woo;Ko, Jae-Yong
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • 2013.06a
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    • pp.132-133
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    • 2013
  • Ship salvage crane is to salvage the equipment safely, this type of crane in the shipyard's large ships or port is being used a lot of container etc. Such a salvage crane was installed on the land and it is built to use the harbour facilities. In this paper, the response amplitude operator and the wave exiting force of floating type salvage crane is calculated and it is performed to structural response estimation.

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Structural Integrity Evaluation for Crane Bracket of Armored Recovery Vehicle (구난장갑차 크레인 브래킷에 대한 구조건전성 평가)

  • Jung, Jae-Woong;Jung, Un-Hwa;Kim, Cheon-Soo;Yu, Young-Soo;Park, Kyung-Chul;Park, Ki-Chul
    • Journal of the Korea Institute of Military Science and Technology
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    • v.16 no.5
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    • pp.653-658
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    • 2013
  • For towing the new type armored vehicle and maintaining the close support, the armored recovery vehicle(ARV) with winch and crane has been developed. In case of crane, it is mainly used to salvage heavy objects by rotational and vertical motion. Especially, the crane bracket is very important parts due to fixing the ARV's body and rotary joint and preventing the force rotation of crane. Therefore, the crane bracket needs to have an enough strength to endure the high load and it is very important to analyze the stress distribution under loads. In the present work, the experimental and analytical investigation on structural integrity evaluation of crane bracket were carried out. The simulation of three-dimensional finite element method(FEM) was compared with experimental datum. From the numerical results, the FEM simulations corresponded well with th experimental results and the structural safety was confirmed by safety factor.

Lifting Analysis for a Sunken Ship in Consideration of Elongation of Crane Ropes (크레인 로프의 신장을 고려한 침몰선체의 인양력 해석)

  • CHOI KYUNG-SIK;SHIN MAENG-KEE
    • Journal of Ocean Engineering and Technology
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    • v.17 no.3 s.52
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    • pp.33-38
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    • 2003
  • This study focuses on an analytical approach to calculate crane-lifting forces for a sunken ship, with consideration to elongation of crane ropes. The method takes into account the relation of lifting forces acting in wire rope slings to the inclination of the ship's hull, including the effect of lug positions. For lifting analysis, the Euler angles are defined to represent the inclination of a sunken ship in developing the static force and moment equations. An additional compatibility condition is introduced in order to solve an indeterminate lifting analysis problem with 4 cranes. A set of lifting forces along the 4 crane ropes is calculated. A 3-dimensional example of the G/T 1500 oil tanker is analyzed. The results show that the information obtained by the method could be useful to engineers when conducting salvage work.

Calculation of 4 Crane Lifting Forces for a Sunken Ship (4기 크레인에 의한 첨물 선체의 인양력 계산)

  • 이상갑
    • Journal of Ocean Engineering and Technology
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    • v.14 no.1
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    • pp.17-22
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    • 2000
  • This study focuses on a simple analytical approach to calculate crane lifting forces for a sunken ship. The method takes into account the relation of lifting forces acting in wire rope slings to the inclination of the vessel including the effect of lug positions. The importance of the sunken ship salvage is explained from the statistics of ship casualties during last 15 years. Euler angles are introduced to represent the inclination of a sunken ship in developing the static force and moment equations,. Three dimensional examples with one redundant degree of freedom for a GT1500 oil tanker are analyzed and the results show that the information obtained by the method could be useful to salvors to conduct salvage work.

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Lifting Analysis for a Sunken Ship in Consideration of Elongation of Crane Ropes (크레인 로프의 신장을 고려한 침몰선체의 인양력 해석)

  • Choi, Kyung-Sik;Shin, Maeng-Kee
    • Proceedings of the Korea Committee for Ocean Resources and Engineering Conference
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    • 2003.05a
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    • pp.179-184
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    • 2003
  • This study focuses on an analytical approach to calculate crane lifting forces for a sunken ship in consideration oj elongation of crane ropes. The method takes into account the relation of lifting forces acting in wire rope slings to the inclination of the ship's hull including the effect of lug positions. For lifting analysis, the Euler angles are defined to represent the inclination of a sunken ship in developing the static force and moment equations. An additional compatability condition is introduced in order to solve an indeterminate lifting analysis problem with 4 cranes and a set of lifting forces along the 4 crane ropes is calculated. A 3-dimensional example of the G/T 1500 oil tanker is analyzed and the results show that the information obtained by the method could be useful to engineers to conduct salvage work.

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Physics-based Salvage Simulation for Wrecked Ship Considering Environmental Loads (환경 하중을 고려한 침몰 선체의 물리 기반 인양 시뮬레이션)

  • Ham, Seung-Ho;Roh, Myung-Il;Kim, Ju-Sung;Lee, Hye-Won;Ha, Sol
    • Journal of the Society of Naval Architects of Korea
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    • v.52 no.5
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    • pp.387-394
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    • 2015
  • Before salvaging a wrecked ship, the physics-based simulation is needed to predict lifting force before real operation by floating crane or barge. Procedures affecting lifting force for the salvage can be divided into three stages. At the first stage, the bottom breakout force for the wrecked ship to escape from seabed sediment should be calculated. At the second step, the current force acting on the wrecked ship while lifting from the seabed to near sea surface should be considered. Finally, buoyancy change near at the sea surface when the wrecked ship start to escape from the water should be considered. In the previous studies, only the breakout force at the first stage was calculated based on simple assumption of embedment depth and contact area of the wrecked ship. Therefore, we develop a program for salvage simulation including whole stages. It is composed of four modules such as the equations of motion, time integration, force calculation, and visualization. As a result, it is applied to simulate lifting the wrecked ship according to various environmental loads including seabed sediments.

Exploring Structural Stability using Arduino for the Prevention of Tower Cranes' Safety Accident : focused on ardu (타워크레인의 안전사고 예방을 위한 아두이노 기반 구조적 안정성 탐색)

  • Kim, Jun-Seok;Lee, Won-Hee;Kim, Sungae
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2019.05a
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    • pp.27-31
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    • 2019
  • Various safety accidents occur frequently at construction sites due to poor operation of construction machines and insufficient safety facilities. Among them, safety accidents on the Tawerkrain have resulted in massive casualties and property damage. Therefore, the purpose of this study is to develop safety devices to prevent safety accidents in the Tower Crane. To this end, the existing safety device was explored and the model of the Tower Crane was constructed using Arduino. The weight of the object, the weight of the pendulum, and the distance from the center axis, as well as the equation of turning and experimentation, suggested mobile weights as a safety device to identify and resolve problems with existing safety devices. This is expected to minimize the limit on the salvage distance of the tower crane, thus providing a safer working environment away from the risk of a safety accident.

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