本文是以二維截片理論（Strip theory）為基礎，配合源點分佈法所構成，並以微軟公司(Microsoft Corporation)所發展的 Visual Basic 6.0 為工具，用來建立一套電腦整合評估軟體，此評估軟體是以過去所發展之程式為基礎，原先僅可分析任何船型在不規則波中之五度運動量、相對波高、垂向及側向加速度、龍骨出水機率；而在本文中將其功能延伸擴充，可用以計算船舶在不同海域之平均橫渡時間、每年橫渡數及每年在某固定航線之航行誤點數，主要目的是提供船東在船型初步設計階段就能作整體成本分析之重要參考因素，以便作為較佳的船型主要尺寸選擇之重要參考因素。因此，本套軟體將可提升造船廠的船型設計人員對船舶之耐海性能的評估能力；本文所發展之軟體以中船自行設計的兩艘同類型貨櫃船作基本之測試後，其結果尚稱合理，在配以適當之成本分析，便能達到一最佳成本之船型的選擇。

This paper is based on two-dimension strip theory.The purpose of the present study is to discuss a procedure to evaluate seakeeping performance and operability in rough weather during the preliminary design of cargo ships.The present study goes one step further by estimating the consequences of different seakeeping performance in terms of cost.Formulae are presented to estimate the annual delay and the reduced number of crossings per year due to voluntary speed reduction and course change to escape from hazardous responses.

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