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Free running ship model tests of interaction between a moored ship and a passing ship

Raszeja Magdalena, Hejmlich Andrzej, Nowicki Jacek, Jaworski Tomasz

Zeszyty Naukowe Akademii Morskiej w Szczecinie

2022

nr 72 (144)

50--56

For many reasons, ship model interaction tests are performed in experimental towing tanks. This paper presents research on the hydrodynamic forces acting on a ship tied up at the solid berth, which is produced by other ships passing by using free-running ship models with much larger dimensions than those used in towing tanks. A passing ship model was controlled by a human operator – an experienced master. This enabled a study of the influence of the interaction impact on the course of the maneuver. The research was carried out at the Ship Handling Research and Training Centre in Iława. The ship model was moored alongside and equipped with multi-directional force sensors linking the ship model with a solid berth. Forces were measured as a function of the passing ship speed, side distance between both ships, ship sizes, and depth-to-draft ratio (H/T). Forces were measured in two planes: the longitudinal (surge) and the transversal (sway). A numerical database was processed and ordered according to the variables. The fuzzy model was created within a “Matlab” computing environment using a Sugeno-type self-learning neuron network model. The proposed Sugeno model was evaluated with other methods presented by Flory (2002), Seelig (2001), and PASS-MOOR by Wang (1975). The ultimate goal of this study was to simplify the method of predictive calculations for adjusting speed and distance when passing by the moored ship, which ensures compliance with safe port mooring requirements.

The analysis of brushing tool characteristics

Spadło S.

Archives of Civil and Mechanical Engineering

2004

Vol. 4, no 4

27-40

Przedstawiono analityczne rozwiązanie zagadnienia sił, z jakimi oddziaływują pojedyncze włókna szczotki obrotowej z powierzchnią. Przeprowadzono analizę deformacji pojedynczych drucików szczotki, uwzględniając występujące więzy kinematyczne dla przypadku powierzchni płaskiej niepodatnej z występowaniem tarcia. Przedstawiono wyniki symulacji komputerowych w postaci zależności sił oddziaływań drucików z powierzchnią w funkcji kąta obrotu szczotki.

In this paper, an analytical procedure is developed in order to evaluate the filament loading of a circular brush. Filament deformation is computed based on the mechanic analysis in conjunction with kinematic constraints for a rigid flat surface with friction taken into account Numerical results which reveal the relationship between rotation angle and force distribution are reported.