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A new approach in modelling the interaction forces
Gronarz, A. (2011). A new approach in modelling the interaction forces, in: Pettersen, B. et al. (Ed.) 2nd International Conference on Ship Manoeuvring in Shallow and Confined Water: Ship to Ship Interaction, May 18 - 20, 2011, Trondheim, Norway. pp. 165-174
In: Pettersen, B. et al. (2011). 2nd International Conference on Ship Manoeuvring in Shallow and Confined Water: Ship to Ship Interaction, May 18 - 20, 2011, Trondheim, Norway. Flanders Hydraulics Research/Ghent University/Norwegian Marine Technology Research Institute/Norwegian University of Science and Technology (NTNU)/The Royal Institute of Naval Architects: London. ISBN 978-1-905040-83-4. X, 422 pp., more
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Document type: Conference paper
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  • Gronarz, A.
Abstract
    Usually the additional hydrodynamic forces and moments acting on the own ship passing a target ship are modelled by a damped oscillation with factors describing the dependency of the situation parameters. This approach is practicable for vessels of comparable size and speed, but some configurations cannot be covered by it.
    • Variation of length
    Short vessels overtaking long ones and long vessels overtaking short ones show force developments which are far from harmonic oscillations. • Variation of speed
    Changing the velocity of the own and the target ship from +Vmax through zero to –Vmax covers all situations between of overtaking and encountering manoeuvres and can also not be modelled easily by sine or cosine functions.
    A pragmatic way of describing the characteristic curves of the forces and moments for these special cases is introduced. This method is complemented by factorial influence functions with variable exponents, which are using a nonlinear regression analysis of model test results.
    This so called “Hybrid Regression” is not a single formula any more but an algorithm formulated as a subroutine. For more convenient use a structural framework can be set up with a formula parser and a special input data set in order to compute the interaction forces with a high level of flexibility depending on the source of information.
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