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Investigation of dynamics and power needs for container unloading from ship process
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Klaipėda University, Faculty of Marine Technologies and Natural Science, Bijunu str. 17, LT-91225 Klaipėda, Lithuania
Vilnius Gediminas Technical University, Faculty of Transport Engineering, Saulėtekio al. 11, LT-10223 Vilnius, Lithuania
Vilnius Gediminas Technical University, Faculty of Fundamental Sciences, Saulėtekio al. 11, LT-10223 Vilnius, Lithuania
Publication date: 2022-03-31
Eksploatacja i Niezawodność – Maintenance and Reliability 2022;24(1):89-99
  • A complex mathematical model describes the process of container lifting from a ship.
  • The power of frictional forces between oscillating ship and container were analyzed.
  • Lifting power needs dependency on mass of container and frictional forces was deduced.
  • Results can be applied to safety and efficient handling of containers in green ports.
The operational problem of container unloading from the ship is analyzed in this paper. Dynamic “crane-cargo-ship” system was investigated, and a mathematical model was created. In the model, the gap between the container and the ship’s cargo hold, the mass of the cargo, the container’s center of the mass, and the frictional forces that may occur during lifting from the cargo hold were estimated. Numerical analysis of the system was performed. Results of numerical analysis were compared with experimental measurements of containers unloading process in port. Requirement of lifting power was modelled depending on mass of cargo. Additional power needs in case of contact forces between container and wall of the ship’s cargo hold were calculated. Rational lifting conditions could be deduced using a created mathematical model and the reliability of the container and cargo during lifting could be deduced.
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