小水線面雙體離岸風電人員運輸船耐海性能評估

SEAKEEPING PERFORMANCE ASSESSMENT OF OFFSHORE WIND POWER CREW TRANSFER SWATH VESSELS

本研究擇選三型小水線面雙體離岸風電人員運輸船，使用線性頻域三維小板法HSC3D，計算船體在斜浪規則波中之運動反應，並以船模實驗資料驗證數值計算。三型小水線面雙體船之非規則波運動反應使用Bretschneider波譜，於不同航速及航向下，以航向-航速極座標圖進行全域耐海性能特性分析，離岸風電人員運輸船之運動基準採用Noble Denton海洋運輸指南中的建議，其為人員運輸船在海上運動反應之限制條件，可據以探討船舶在不同海象之可操作率，可提供風電安裝及維護船隊監督，依據氣象資料與天候窗，派遣合適之離岸風電人員運輸船型進行安裝及維護工作。數值計算結果顯示：小水線面雙體船於艉浪航向下的耐海性能較差，艉浪高速航行下，會產生一縱搖運動反應極值區域，船舶越小該區域會越為明顯，水平穩定鰭的設計可用於控制船舶運動反應，避免船舶航行時產生艏沉之現象。

This research selected three types of small waterplane area twin hull (SWATH) crew transport vessels and applied the HSC3D, linear frequency domain three-dimensional panel method, to calculate the motion responses in regular waves. The numerical predictions have been verified by the published seakeeping model tests. Using the Bretschneider spectrum to estimate the irregular wave motion responses of SWATHs at different speed and heading conditions. The comprehensive seakeeping performance analyses has been conducted by using the polar plot. Providing the use of motion criteria of Noble Denton Guidelines for Marine Transportations, as the limit conditions for the crew transport vessels to assess the ship operability ranges based on the weather window information. It can provide the supervisor of wind power installation and maintenance fleets to dispatch suitable size of crew transport vessel for installation or maintenance work based on mete-orological data and weather windows. The numerical results show the SWATHs have poor seakeeping performance with high-speed condition in the stern waves. There will be the extreme pitch motion responses in the stern wave conditions, which will be more significant as the ship becomes smaller. The SWATHs should be equipped with the horizontal stabi-lizing fins to control the motion responses and avoid bow diving at seas.