Abstract
We propose a new shipboard crane configuration for offloading cargo in open seas. We show that the “Maryland Rigging” crane of ship’s configuration, used in association with a friction control mechanism, provides a very effective method for reducing load pendulation caused by the motion of the crane in the roll direction. The effectiveness of the control technique is obtained by comparing the performances of the “Maryland Rigging” configuration with the standard “rider block tagline system”, commonly used in crane ships. In most of the cases studied for which different sea conditions are considered, the “Maryland Rigging” reduces the root mean square swing of the load by an order of magnitude as compared to the current rider block configuration.
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The point (x p,y p) lies on an ellipse determined by L(t) =L 1 +L 2 and the foci on the points B and C of Figure 4. This ellipse can be parametrized by a number ξ as follows. First, let x′ and y′ be the coordinates of the pulley in the frame with origin (x c, y c) and x′-axis along the line BC_. We write x′ and y′ in terms of ξ as \( x' = \frac{{L\left( t \right)}}{2}\cos \xi ,y' = \frac{{\sqrt {L{{\left( t \right)}^2} - L_4^2} }}{2}\sin \xi . \) After changing the coordinates of the pulley into the rest frame, we have: x p = x′ cos β — y′ sinβ +x c and y p = x′ sinβ + y′ cos β + y c.
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© 2000 Springer Science+Business Media Dordrecht
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Baptista, M.S., Hunt, B.R., Grebogi, C., Ott, E., Yorke, J.A. (2000). Control of Shipboard Cranes. In: Van Dao, N., Kreuzer, E.J. (eds) IUTAM Symposium on Recent Developments in Non-linear Oscillations of Mechanical Systems. Solid Mechanics and Its Applications, vol 77. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-4150-5_8
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DOI: https://doi.org/10.1007/978-94-011-4150-5_8
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