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Reduction of Hull Vibration in a Landing Craft by Means of a Vibration Absorber

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TLDR
In this article, the authors describe the design and installation of a vibration absorber, and give the results of evaluation tests carried out in calm seas and in rough seas, in order to increase the structural damping and minimise the vibration response.
Abstract
Structural problems caused by wave induced hull vibration were experienced by a series of six landing craft operated by the Royal Australian Navy. These craft, of maximum displacement of 520 tonnes, were designed primarily for the transport of cargo from ships off-shore to water terminals and undeveloped beaches, but they have also been operated on long sea voyages, often in rough seas. It was decided to fit a damped vibration absorber in each vessel to increase the structural damping and minimise the vibration response. The absorber used has a mass of 10 tonnes, is supported on air springs, and is installed in the bows of the ship. The paper describes the design and installation of the vibration absorber, and gives the results of evaluation tests carried out in calm seas and in rough seas. Several years of operational experience have now been gained and the absorber has proved to be very effective in reducing hull vibration in these craft. The paper is followed by a discussion.

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Journal ArticleDOI

Vibration reduction of main hulls using semiactive absorbers

TL;DR: In this article, a semi-active-type absorber for vibration reduction of main hull girders was investigated and a suboptimal operation law was derived based on the properties of the absorber and the theory of optimal vibration reduction.
Journal ArticleDOI

Design of bow absorber for vibration reduction of hull girders

TL;DR: In this article, an active bow absorber for vibration reduction of hull girders is presented, including the dynamics of the hydraulic system, the control law of the absorber is derived basing on the optimal control and optimum estimation theory.
Journal ArticleDOI

Robust Control for the Vibration Attenuation of Superstructures

TL;DR: In this paper, a robust control methodology applied for active vibration reduction on superstructures using the H∞ synthesis is presented based on this technique, the control law may be calculated according to the required objective.