- 學位論文
運用有限元素法分析船舶俥葉推進器壽期之個案研究
Research on Service Life of a Ship PropellerUsing Finite Element Analysis
摘要
隨著國艦國造政策興起，台灣造船工業日益蓬勃，從50噸小艇至4000噸大型運輸船，均可由國內船廠建造完成，但伴隨而來的就是後續維修及壽期規劃問題，本研究個案正值國艦國造後第一個維修週期，雖然裝備新穎，但仍應未雨綢繆提前研擬後續維修政策，以避免後續使用罅隙。 本研究針對研究個案MTU 16V 4000 M90型主機以撓性聯軸器連結ZF 7500 型減速機後帶動大軸轉動俥葉，藉由1:100俥葉模型於水平式環流水槽中模擬俥葉水中受力情形，再以ANSYS數值模擬方式計算俥葉金屬疲勞引發故障可能時間；續再以ANSYS數值模擬方算計算等效應力、等效應變、變形量等模擬方式比對，以全壽期管理概念於運作維持階段建議最佳維修策略及下一個需求產生點最佳時機。 實驗結果顯示，本研究個案俥葉於不同俥速下，因水流影響俥葉受力，增加俥速對於金屬疲勞產生採非線性成長，若平均使用狀況下安全壽期可達26.8年，維修歷程中如遇俥葉變形量遽增，應按技術手冊實施檢查，並於第四個維修周期起針對俥葉葉緣處採預防性維修，先以俥葉整形工法減緩變形量增加並立即提出下一個需求規劃，供企業於艦艇壽期末端整體投資規畫參考。
並列摘要
Thanks to the “Indigenous Defense Ship” policy, the shipbuilding industry in Taiwan is getting stronger nowadays. From 50-ton boats up to 4000-ton heavy lift vessels can be built by indigenous shipyards. Even so, the issues of subsequent maintenance and service life planning will continue to arise. The case in this study is currently in its first maintenance cycle after being built. To avoid a time gap in service, the subsequent maintenance strategy should be arranged beforehand, even though the equipment is still new. In this study, the propeller is turned by the shaft driven by a MTU 16V-4000-M90 engine and a ZF-7500 reducer which connected by flexible shaft coupling. The force on the propeller in the water can be simulated by placing a 1:100 scale propeller model in a horizontal circulating water tank, followed by calculating the possible failure time due to metal fatigue by means of ANSYS numerical simulation. Furthermore, ANSYS is used to calculate equivalent stress, equivalent strain, deformation. With all the data and based on the concept of service life management, the most appropriate maintenance strategy during the Operational Support stage and the optimal timing for the next demand can be provided to the business owners. The result shows that the metal fatigue of the propeller in this study grows non-linearly when accelerating due to the influence of water flow at different speeds. Under the situation of normal using, the average safe service life can reach 26.8 years. If a sudden increase in deformation of the propeller is observed during maintenance, it is recommended to perform inspections according to the technical manual. To reduce the increase of deformation, preventive maintenance and shaping techniques should be performed on the edge of propeller starting from the fourth maintenance period. Though reshaping the propeller blades can help alleviate the increase in deformation, the plan of next demand still needs to be proposed immediately to avoid a time gap in service. This information can serve as a reference for business in their overall investment planning at the end of the ship’s service life.