一種協助離岸風機安裝船能於冬天施工的多功能船舶研發

DEVELOPMENT OF A MULTI-PURPOSE AUXILIARY VESSEL FOR OFFSHORE WIND FARM INSTALLATION IN WINTER TIME

由於臺灣海峽從每年10月至隔年3月風浪過大，因此離岸風機無論是基樁或風機葉片的安裝幾乎都無法進行。本論文是為離岸風力發電建置工程提供一種有效延長可施工天數的方式，即在安裝船的上浪側，佈置一種特殊設計的擋浪船，使其下浪側進行海上風力發電設施安裝的船舶處於有義波高大幅降低的環境。利用海洋工程常用軟體ANSYS AQWA模擬擋浪船與安裝工作船在不同波浪週期作用下的縱搖(pitch)以及起伏(heave)的運動響應，以探討擋浪船各種船型係數對安裝工作船的波浪遮蔽效果之比較。再由模擬結果找出擋浪船發揮最佳擋浪效果的主要參數尺寸。因應近來風機大型化，基樁以及風機重量均大幅上昇，因此其基樁的安裝均以大型重吊船執行，而風機的安裝亦以大型的自升式安裝船執行，因此所探討工作船的船長有80米、120米、168米與216米，而擋浪船的船長為80米與100米兩種，擋浪船以及工作船的間距分別為100米、200米以及300米。由計算結果可知，擋浪船的吃水以及兩船的間距是影響擋浪效果最重要的參數，吃水愈深擋浪效果越佳，當擋浪船吃水達15米時，80米與100米的擋浪船於台灣西部冬天最常出現6至7秒的波浪週期下可以使工作船的運動量下降一半以上，兩船的間距愈短效果愈佳。而不同工作船的長度於擋浪作用下，其船體運動下降的比例差異並不明顯。

This paper will provide another a specially designed wave-sheltering vessel which is arranged on the upper wave side of the installation ship, to reduce the ship motion of the vessel. The ship motion of the installation vessel can be reduced to 1/3 to 1/2 compared with the original one without wave-sheltering vessel for wave period between 5.5~7.5 seconds, such that the working window can be extended significantly.
Using the marine engineering software Ansys AQWA to simulate the ship motion response of the wave-sheltering vessel and the installation ship under waves. The ship lengths of the installation vessels 80, 120, 168, 216 m, and 80, 100 m for the wave sheltering vessels at the distance separation 100, 200 and 300 m between installation and wave-sheltering vessel are investigated. The pitch and heave motion of the installation vessel under the operation of wave-sheltering vessel are calculated. From the calculate results, it is found that except the draft and the length of the wave-sheltering vessel, the distance between two vessels is also an important parameter.
Meanwhile, due to the low pitch and heave motion at head sea wave, the wave-sheltering ship can also be used as a comfortable hotel accommodation to provide engineers who work at sea.