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The detection and analysis of wave slamming from full-scale ship measurements.
Thesis (MEng)--Stellenbosch University, 2018.
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| Format: | Thesis |
| Language: | en_ZA |
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Stellenbosch : Stellenbosch University
2018
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| _version_ | 1867613935208759296 |
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| access_status_str | Open Access |
| author | Saunders, Clinton Frederick Wood |
| author2 | Bekker, Annie |
| author_browse | Bekker, Annie Saunders, Clinton Frederick Wood |
| author_facet | Bekker, Annie Saunders, Clinton Frederick Wood |
| author_sort | Saunders, Clinton Frederick Wood |
| collection | Thesis |
| dc_rights_str_mv | Stellenbosch University |
| description | Thesis (MEng)--Stellenbosch University, 2018. |
| format | Thesis |
| id | oai:scholar.sun.ac.za:10019.1/105084 |
| institution | Stellenbosch University (South Africa) |
| language | en_ZA |
| last_indexed | 2026-06-10T12:44:02.133Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from SUNScholar — Stellenbosch University Repository |
| publishDate | 2018 |
| publishDateRange | 2018 |
| publishDateSort | 2018 |
| publisher | Stellenbosch : Stellenbosch University |
| publisherStr | Stellenbosch : Stellenbosch University |
| record_format | dspace |
| source_str | SUNScholar — Stellenbosch University Repository |
| spelling | oai:scholar.sun.ac.za:10019.1/105084 The detection and analysis of wave slamming from full-scale ship measurements. Saunders, Clinton Frederick Wood Bekker, Annie Muiyser, Jacques Stellenbosch University. Faculty of Engineering. Dept. of Mechanical and Mechatronic Engineering. Hydrodynamics Vibration -- Measurement Deviation (Mathematics) Wavelet analysis UCTD Full-scale ship measurements Thesis (MEng)--Stellenbosch University, 2018. 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. AFRIKAANSE OPSOMMING: Skeepslag op die boeg en agterstewe van ’n skip is ’n aanhoudende en kommerwekkende probleem op die S.A. Agulhas II. Verskeie volskaalse vibrasie metings is al geneem op die skip tydens verskeie reise in die Suidelike Osean. Vorige navorsing het bewys dat die vibrasie wat ervaar word skade kan aanrig in die agterstewe en waarskynlik in die boeg wanneer die skip op die oop see vaar (Soal, 2014). Om beter te verstaan wat skeepslag veroorsaak, is ’n algoritme ontwikkel om branderklap in die vibrasie sein te identifiseer en te tel. Skeepslag is geindentifiseer in die tyd domein deur middel van versnellingspieke, asook in die frekwensie domein deur middel van golfomskakeling. Statistiese drempels is dan bepaal deur van ’n mediaan absolute afwyking gebruik te maak. Daar is gevind dat die data in die frekwensie domein meer akuraat is om skeepslag gevalle te identifiseer en te tel. Skeepslag is ook vergelyk met omgewingsfaktore sowel as operasionele faktore vir die reise. Daar is vasgestel dat beide omgewings en operasionele faktore ’n beduidende uitwerking het op die frekwensie van skeepslag. 2018-11-27T20:51:38Z 2018-12-07T06:58:45Z 2018-11-27T20:51:38Z 2018-12-07T06:58:45Z 2018-12 Thesis http://hdl.handle.net/10019.1/105084 en_ZA Stellenbosch University 123 pages : illustrations application/pdf Stellenbosch : Stellenbosch University |
| spellingShingle | Hydrodynamics Vibration -- Measurement Deviation (Mathematics) Wavelet analysis UCTD Full-scale ship measurements Saunders, Clinton Frederick Wood The detection and analysis of wave slamming from full-scale ship measurements. |
| title | The detection and analysis of wave slamming from full-scale ship measurements. |
| title_full | The detection and analysis of wave slamming from full-scale ship measurements. |
| title_fullStr | The detection and analysis of wave slamming from full-scale ship measurements. |
| title_full_unstemmed | The detection and analysis of wave slamming from full-scale ship measurements. |
| title_short | The detection and analysis of wave slamming from full-scale ship measurements. |
| title_sort | detection and analysis of wave slamming from full scale ship measurements |
| topic | Hydrodynamics Vibration -- Measurement Deviation (Mathematics) Wavelet analysis UCTD Full-scale ship measurements |
| url | http://hdl.handle.net/10019.1/105084 |
| work_keys_str_mv | AT saundersclintonfrederickwood thedetectionandanalysisofwaveslammingfromfullscaleshipmeasurements AT saundersclintonfrederickwood detectionandanalysisofwaveslammingfromfullscaleshipmeasurements |