本文主要目的是要探討三體船的操縱性能，針對主船體對應於不同副船體的縱向位置及橫向位置來做迴旋圈試驗(Turning circle tests)和Z型試驗，以便了解當不同側船體排列對操縱性的影響。本文的方法是先用PMM(Planar Motion Mechanism)來量測船舶操縱性導數，再將其數值代入船舶運動方程式來進行一連貫的迴旋圈試驗和Z型試驗運動模擬，得到不同側船體排列方式的船舶操縱性能。本文中對三體船所進行的迴旋圈試驗，主要可了解不同側船體排列方式對前進距離、迴旋橫徑及迴旋半徑的影響。而Z型試驗是要檢視舵操控船之能力和船的方向穩定性，以及迴旋時間與超射角的問題。對三體船的操縱性能之研究可提供設計參考。

In the paper the maneuvering characteristics of the trimaran ship including the turning circle test and zig-zag test with respect to different side-hull arrangements are studied. The effects of the different side-hull arrangement on the maneuvering characteristics are deeply investigated. The hydrodynamic derivatives of the trimaran ship with the different side-hull arrangement are measured by using the PMM technique and substituted into equations of maneuvering motion to simulate the turning circle test and the zig-zag test. The maneuvering performance of the trimaran ship is then investigated through the turning circle test and the zig-zag test. From the calculated results of the turning circle test, we can investigate performance of the advance, the transfer and the steady turning radius of the trimaran ship with different side-hull arrangements while the zig-zag test can be applied to measure the control ability of the rudder, the directional stability, the overshoot time and the overshoot angle for the trimaran ship. The present results can serve as the useful references of the maneuvering design for the trimaran ship.

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