https://scholars.lib.ntu.edu.tw/handle/123456789/71236
Title: | 環境外力下船舶拖帶模擬計算系統之研發與應用 Development and Application of a Fast-time Simulation System for Ship Towing under the Action of Environmental Forces |
Authors: | 林緯作 Lin, Wei-Tso |
Keywords: | 拖帶;拖船;拖纜;模擬;航向安定性;towing;tow ship;towline;simulation;course stability | Issue Date: | 2005 | Abstract: | 因應海洋環境保護之需要,必要時必須執行船舶拖帶作業,而為了提升拖帶作業的迅速與安全性,有必要事前充分掌握拖帶運動特性,而本研究的目標即在於建立船舶拖帶運動模擬與分析工具,以探討拖纜長度、繫纜位置及拖帶船速等諸要素對靜水中航向穩定性及拖纜張力的影響,並進一步模擬環境外力作用下的拖帶運動,以探討風、浪、流等環境外力對拖帶安全的影響。 本研究依日本MMG數學模式建構包含拖船、拖纜及被拖船三者在內之耦合運動方程式,並考慮風、浪、流等環境外力之影響。以聯合船舶設計發展中心現有之九艘實船操縱運動性能測試數據之中經過模擬驗證良好,代號T-1之油輪及代號BC-1之散裝貨輪分別為供試拖船及被拖船,在靜水中以及環境外力作用下進行模擬分析。 在靜水中,針對拖纜長度、繫纜位置和拖帶船速等要素對拖帶系統之航向穩定性及拖纜張力變化的影響進行參數分析,以了解此模式下系統之基本特性。而考慮環境外力的部分亦分別對風浪流環境外力個別、同時作用及不同拖帶船速對拖帶運動之影響提出完整之結論。 本研究依據模擬分析結果,與相關參考文獻之研究結果進行了定性上的比較,確認了本模式作為船舶拖帶作業初步分析工具的有效性。 Rescuing towing-operation is an extremely risky task especially in a bad weather condition. Traditionally, it depends on the experience of towing operators. In this research, a simulation system has been developed to help rescuers to be acquainted with the behaviors and phenomena of towing motions before towing. A MMG mathematical model for simulating surge-sway-yaw coupled motions of a single ship had been developed and validated for many years in Japan. Based on the method of MMG model, a model of towing system, in which tow and towed ships are connected with an elastic catenary towline, is developed in the present study. In numerical simulations, the results of parametric study on the influence of towline length, connection positions of tow ship and towed ship, ship speed to course stability and towline tension in clam water are discussed. Furthermore, the effects of wind, wave and current are also taken into account and the results are also examined by the similar way as that in calm water. Finally, the validity of the present model is verified qualitatively by comparing the present results with some published results of related researches. |
URI: | http://ntur.lib.ntu.edu.tw//handle/246246/51090 | Other Identifiers: | zh-TW |
Appears in Collections: | 工程科學及海洋工程學系 |
File | Description | Size | Format | |
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ntu-94-R92525040-1.pdf | 23.53 kB | Adobe PDF | View/Open |
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