Prof. Dr.-Ing. Stefan Krüger

Address

Hamburg University of Technology
Institute of Ship Design and Ship Safety
Am Schwarzenberg-Campus 4 (C)
D-21073 Hamburg

Phone

040-42878-6105

Fax

040-42731-4467

Room

3.009

E-Mail

krueger(at)tuhh(dot)de

Publications

[157026]
Title: Determination of the Vertical Location of the Axis of Rotation of the Roll Motion from Full-Scale Measurements.
Written by: Lars Johnsen, Stefan Krüger
in: <em>OMAE, Virtual Conference, Online</em>. June (2021).
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[pdf]

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Abstract: The behavior of a floating structure results from the mechanics of its, more or less, rigid body and the hydrostatic and hydrodynamic forces acting on it. Particularly for ships, as long and slender bodies, the axis of roll and its vertical position is of special importance. It is around this axis that the lowest lateral accelerations in roll motion occur, which is not only weakly damped but also easily stimulated due to the relatively low mass moment of inertia around the ship’s longitudinal axis. With the intention of clarifying some widespread misconceptions about the location of this axis and to investigate its relation to the natural roll period, full scale measurements have been carried out using a set of two mobile Inertial-Measurement-Units. The Inertial-Measurement-Units were placed on different heights, one above and one below the assumed location of the axis of rotation. Based on the measured accelerations and angular velocities, the average vertical location of the axis of the roll motion for small angles is determined.

Projects / Research Projects