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Motions and Loads of a High-Speed Craft in Regular Waves: Prediction and Analysis

Lookup NU author(s): Dr Federico Prini, Professor Richard Birmingham, Dr Simon Benson, Professor Bob Dow



This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License (CC BY-NC 4.0).


The paper presents a comparison of results from numerical and experimental seakeeping motion tests completed on the Severn Class lifeboat of the Royal National Lifeboat Institution (RNLI). A numerical model was previously developed to predict the motions and loads that the craft is likely to experience throughout its operational life [1]. Model-scale seakeeping tests have now been carried out at Newcastle University’s towing tank to validate the numerical model. Two models were tested, of which one was designed and built to be segmented and held together through a strain-gauged backbone beam. Results are presented in terms of Response Amplitude Operators (RAOs) and compared against the motions from the hydrodynamic simulations. The results give confidence that the numerical model accurately predicts the craft behaviour at low speed, whilst, as expected, its accuracy at high speed becomes questionable. The validation plan will also involve towing tank tests with global loads measurement and extensive full-scale sea trials in real operational conditions. Results will contribute to improving the RNLI’s design and operational practice and could be of use to others interested in the behaviour of high-speed craft in heavy seas.

Publication metadata

Author(s): Prini F, Birmingham RW, Benson S, Phillips HJ, Sheppard PJ, Mediavilla Varas J, Johnson M, Dow RS

Publication type: Conference Proceedings (inc. Abstract)

Publication status: Published

Conference Name: 24th International HISWA Symposium on Yacht Design and Construction

Year of Conference: 2016

Print publication date: 14/11/2016

Acceptance date: 01/01/1900

Date deposited: 05/12/2016

ISSN: 9789461867490