本文主要探討三體船於波浪中的操縱性能，針對不同的縱向與橫向側船體配置來進行迴旋運動模擬，以便瞭解不同側船體排列對波浪中操縱性能的影響。本文以結合操縱性與耐海性的數學模式為基礎，利用相對波高的概念，採用B-Spline整順方法，瞬時改變水下截片形狀來重新計算流體動力係數，並以此數值模式來模擬各配置下的左、右迴旋運動。
本文比較不同側船體配置下的戰術直徑(Tactical Diameter)、前進距離(Advance)、迴旋橫距(Transfer)、迴旋時間與六度運動反應。結果顯示介於船舯與船艉間的側船體縱向配置與中等距離的側船體橫向配置有普遍較佳的迴旋性，遠離主船體的側船體橫向配置則有較好的橫搖運動反應。

The present paper mainly studies the steering performance of the trimaran ship in waves. The effects of different side hull arrangements on the turning circle motion of the trimaran ship are also investigated by using the time domain simulation analysis. The mathematical model including seakeeping and maneuvering characteristics are applied here and the relative wave elevation concept is considered. In order to calculate the hydrodynamic coefficients of the instantaneous draft of the each hull section for the trimaram ship at any time in waves, the B-spline fairing method is adopted to simulate the source points of the hull sections for the source distribution method.
The tactical diameter, advance, transfer, turning time and six degrees of freedom of motions with respect to different side hull arrangements are calculated for comparisons. The results reveal that the arrangement with the middle clearance and middle stagger i.e. PL2 and PT2, has the better turning performance and those with the larger clearance have the better roll response. The present analysis can be as the useful reference for the consideration of the trimaran ship maneuvering characteristics.

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