As a part of a co-operation project between the Division of Naval Architecture at KTH, Stockholm, and the Swedish Defence Material Administration, full-scale trials have been performed on a small naval craft in rough seas. This paper is the first presentation of these trials. Characteristics of impacts, puls lengths and rise times are discussed. Comparison is made between statistical distributions of peak values and therefrom derived Rayleigh distributions. A brief study is made on filtering of acceleration recordings. The results are used to verify computer simulations, indicating that bow seas would give higher pressure magnitudes than head seas. Practical problems related to this kind of full-scale tests are discussed, for example operational considerations when determining extreme levels for design criteria. Areas of further studies are exemplified, e.g. simulations and correlations between pressure, accelerations and structural response.
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