The detection and analysis of wave slamming from full-scale ship measurements.

[摘要] ENGLISH ABSTRACT: Bow and stern wave slamming has proven to be a persisting and concerningproblem on the S.A. Agulhas II. Various full-scale vibration measurements havebeen conducted over several voyages in the Southern Ocean. Past research hasconcluded that vibration has reached levels where damage was possible in thestern and is probable in the bow during open water navigation (Soal, 2014). Inorder to better understand the drivers behind slamming, an algorithm was developedto detect and count slamming events in full-scale signals. Detection wasdone in the time domain using acceleration peaks, as well as the frequency domainusing a wavelet transform. Statistical thresholds were then determined usinga median absolute deviation. The data in the frequency domain provedmostaccurate for counting slams. Slamming counts were then compared with environmentaland operational variables for the voyages. It was determined thatthese variables have a significant effect on the frequency of slamming events.

[发布机构] Stellenbosch University