Browsing by Author "Saunders, Clinton Frederick Wood"

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    The detection and analysis of wave slamming from full-scale ship measurements.
    (Stellenbosch : Stellenbosch University, 2018-12) Saunders, Clinton Frederick Wood; Bekker, Annie; Muiyser, Jacques; Stellenbosch University. Faculty of Engineering. Dept. of Mechanical and Mechatronic Engineering.
    ENGLISH ABSTRACT: Bow and stern wave slamming has proven to be a persisting and concerning problem on the S.A. Agulhas II. Various full-scale vibration measurements have been conducted over several voyages in the Southern Ocean. Past research has concluded that vibration has reached levels where damage was possible in the stern and is probable in the bow during open water navigation (Soal, 2014). In order to better understand the drivers behind slamming, an algorithm was developed to detect and count slamming events in full-scale signals. Detection was done in the time domain using acceleration peaks, as well as the frequency domain using a wavelet transform. Statistical thresholds were then determined using a median absolute deviation. The data in the frequency domain provedmost accurate for counting slams. Slamming counts were then compared with environmental and operational variables for the voyages. It was determined that these variables have a significant effect on the frequency of slamming events.