兩船航行於縱向波中之激盪力與運動之實驗驗証

Experimental Study of Exciting Forces and Motions for Two Ships Advancing in Longitudinal Waves

The theoretical study for predicting exciting forces and motions between two ships advancing in waves, either by two-dimensional method or by three-dimensional method, was successfully developed previously. However no available experimental data can be used to verify the theory. The purpose of the present paper is to establish an experimental set-up to measure the exciting forces and motions between two ships advancing in waves for comparing with the corresponding theoretical calculations. A series of test has been conducted in NCKU towing tank equipped with wave maker. Because of the limitation of the facility, only measurements in longitudinal waves are considered. Although the comparisons between theory and experiment show some discrepancies due to the unavoidable difficulty including the tank wall interference and the clearance keeping, the paper still offers the firsthand data including some useful information to validate the previously developed theories to some extent. 在波浪航行中之兩船的波浪激盪力與運動的理論解析法在過去已被成功地以二維或三維理論發展完成。然而截至目前為止尚沒有相關之實驗資料，可供驗證。本篇論文之主要目的，即建立一實驗裝置來量測兩船模在波浪行進中之相關激盪力與運動。所有系列之試驗在國立成功大學具造波功能之拖航水槽中測試，由於設備之限制，只有縱向波的例子被考慮。根據理論與本實驗數據之比較結果顯示，雖然由於存有不可避免之困難點，包括槽壁干擾效應與兩船間距之維持，導致本實驗結果仍有一些不甚滿意之處，但整體上之結果仍提供學術界第一手有關兩船的實驗數據，為最近所發展出的理論，在可靠性上已作了相當程度的驗證。