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Bow Thrusters

The Experts below are selected from a list of 114 Experts worldwide ranked by ideXlab platform

Maciej Reichel – 1st expert on this subject based on the ideXlab platform

  • full scale measurements of pressure field induced on the quay wall by Bow Thrusters indirect method for seabed velocities monitoring
    Ocean Engineering, 2018
    Co-Authors: Teresa Abramowiczgerigk, Zbigniew Burciu, Wojciech Gorski, Maciej Reichel

    Abstract:

    Abstract The paper presents the results of full-scale experimental investigation of loads generated on the quay wall by Bow Thrusters during unberthing of a self-manoeuvring vessel. The presented research allowed for the comparison of the measurements results with generally accepted empirical prediction methods and confirmed the utility of the developed measuring setup for the on-line monitoring of jet induced loads. The conclusions from the research are focused on the strengths and limitations of the presented measuring method and its applicability for the on-line monitoring of loads induced by Bow Thrusters on seabed protection along the quay wall.

  • Full scale measurements of pressure field induced on the quay wall by Bow Thrusters – indirect method for seabed velocities monitoring
    Ocean Engineering, 2018
    Co-Authors: Teresa Abramowicz-gerigk, Wojciech Gorski, Zbigniew Burciu, Maciej Reichel

    Abstract:

    Abstract The paper presents the results of full-scale experimental investigation of loads generated on the quay wall by Bow Thrusters during unberthing of a self-manoeuvring vessel. The presented research allowed for the comparison of the measurements results with generally accepted empirical prediction methods and confirmed the utility of the developed measuring setup for the on-line monitoring of jet induced loads. The conclusions from the research are focused on the strengths and limitations of the presented measuring method and its applicability for the on-line monitoring of loads induced by Bow Thrusters on seabed protection along the quay wall.

  • Longitudinal Motion Due to Action of Tunnel Thrusters
    Polish Maritime Research, 2018
    Co-Authors: Maciej Reichel

    Abstract:

    Abstract
    Tunnel Thrusters are propulsion and active control devises that provide a side force, or transverse thrust, to support mooring operations or position keeping. They shorten the time of manoeuvring, reduce the cost of towage and since inception, manoeuvrability specifically in ports has become a lot easier. Tunnel Thrusters can either be operated manually or with the help of Dynamic Positioning systems which makes it even more efficient.
    Theoretically, the transverse force due to tunnel thruster action should generate only lateral and rotational motion. Therefore, it is typical and a common practice during manoeuvring simulations that the longitudinal motion due to the action of tunnel Thrusters is neglected. Nevertheless, the experience of masters and pilots shows that some longitudinal motion due to the action of tunnel Thrusters appears.
    This paper shows some examples of turning manoeuvres carried out with Bow Thrusters only, i.e. no additional control devices or tug assistance have been used. The manoeuvres have been carried with minimal possible initial longitudinal nor lateral speed. Model tests have been done with the use of large manned models of VLCS, PCTC and LNG carrier, which differ in hull shape, dimensions and shape coefficients.
    Results obtained from the tests confirm that the motion caused by Bow thruster besides rotational and lateral motion consists additionally of longitudinal motion. Analysis of the combination of motions due to the action of tunnel Thrusters have been done and some rationale for this phenomenon has been presented. Additionally a short analysis of position of pivot point during tunnel thruster test has been carried out.

Teresa Abramowicz-gerigk – 2nd expert on this subject based on the ideXlab platform

  • Full scale measurements of pressure field induced on the quay wall by Bow Thrusters – indirect method for seabed velocities monitoring
    Ocean Engineering, 2018
    Co-Authors: Teresa Abramowicz-gerigk, Wojciech Gorski, Zbigniew Burciu, Maciej Reichel

    Abstract:

    Abstract The paper presents the results of full-scale experimental investigation of loads generated on the quay wall by Bow Thrusters during unberthing of a self-manoeuvring vessel. The presented research allowed for the comparison of the measurements results with generally accepted empirical prediction methods and confirmed the utility of the developed measuring setup for the on-line monitoring of jet induced loads. The conclusions from the research are focused on the strengths and limitations of the presented measuring method and its applicability for the on-line monitoring of loads induced by Bow Thrusters on seabed protection along the quay wall.

  • Experimental study on the hydrodynamic forces induced by a twin-propeller ferry during berthing
    Ocean Engineering, 2008
    Co-Authors: Teresa Abramowicz-gerigk

    Abstract:

    Abstract The paper presents the experimental study on the influence of wall effect on the hydrodynamic forces induced by the propellers and Thrusters of a ferry during the berthing. The program of the model tests was developed for the twin-propeller, twin-rudder, man-manned model of a car–passenger ferry in 1:16 scale, equipped with two Bow Thrusters. The different combinations of the operational settings of Bow Thrusters and propellers operating in the push–pull mode allowed to observe and quantify the variation of the hydrodynamic forces due to the changes of the water depth to draft ratios and distances to the quay. The results of model tests are introduced and discussed in the paper. The difference between the measured total hydrodynamic force and superposition of the component forces induced by the propellers and Thrusters has been investigated. According to the structure of the generally accepted modular manoeuvring model, the proposition of the weight factors for the component forces comprising the interaction effects has been introduced and discussed.

Ehab Tolba – 3rd expert on this subject based on the ideXlab platform

  • minimizing bed scour induced by ship Bow Thrusters by using quay wall flow deflector
    Malaysian Journal of Civil Engineering, 2019
    Co-Authors: Elsayed M Galal, Nezar S Halabia, Ehab Tolba

    Abstract:

    Recently, the combination of larger Bow–Thrusters installed with vessels have created higher levels of bed scour action affecting the berthing structure and its overall stability. Therefore, the bed near a quay wall structure must have sufficient strength by placing a bed protection which may cause the cost of the project to rise. This research is carried out to investigate experimentally the effect of modifying the geometry of the quay wall surface on minimizing bed scour. This is done by inserting flow deflectors within the longitudinal direction of the wall surface in order to deflect/minimize the water jet affecting the bed near the quay wall. Experimental tests had been carried out for single and triple deflectors. The results showed that the use of flow deflectors achieved a reduction in bed eroded area in front of quay wall face by about 63%, and causes the start point of erosion to move far away from it; this may improve the stability of quay walls. Therefore, the importance of the present study is testing a new possible measure to improve the stability of quay walls by minimizing the scour in front of the wall and to decrease the cost of bottom protection.

  • the effect of sea side quay wall roughness and inclination on bed scour induced by ship Bow Thrusters
    Malaysian Journal of Civil Engineering, 2016
    Co-Authors: Elsayed M Galal, Nezar S Halabia, Ehab Tolba

    Abstract:

    In order to increase their transport efficiency, modern ships are built with increasingly larger propellers and Bow–Thrusters. The combination of larger propellers with greater power and a reduction in bed clearance has created higher levels of bed scour action affecting berthing structures. Therefore, propeller-induced scours need to be considered in the design of quay wall structures. In this study, an experimental investigation was carried out to examine the effect of sea side wall roughness and wall inclination angle on the scouring action induced by Bowthruster in front of the quay wall. Two different kinds of sea side quay wall surfaces (glass and concrete) as an indicator of wall roughness and four different sea side wall inclination angles ( = 90, 75, 60, and 45) were considered in this study. The results showed that the eroded area has been decreased with the increase of the sea side wall roughness and inclination