摘要:離岸風機的設置與風場的海氣象及場址條件息息相關,台灣的地理環境特殊,環境極端條件如颱風、海波流及地震對於離岸風機系統之性能與結構完整性具有非常重要的影響。其次,台灣海峽不同之水深及海床條件對於不同水下結構與基礎的適用性,也攸關離岸風機的建置成本與可靠性。本計畫主要延續及整合前期於能源國家型離岸風力主軸計畫已建立之離岸風機及支撐結構整合設計與驗證、塔架結構安全評估及基樁淘刷分析與基礎動態勁度等計畫成果,計畫目標旨在針對國內離岸風機固定式水下結構之關鍵技術包括(1)風機固定式水下基礎結構設計驗證技術、(2)風機塔架結構安全監測、模擬與破壞早期預測、(3)風機基樁淘刷監測、模擬與預測及(4)風機動態基礎勁度計算模組開發。藉由離岸風機水下支撐結構與基礎結構之設計、分析、測試及驗證之整合,建立自主化的離岸風機固定式水下結構關鍵技術,以提升國內未來離岸風機水下結構的技術能力,而藉由技術整合並配合不同適用性考量,將可確保離岸風機水下結構的安全可靠性與兼顧成本效益,以及協助政府主管機關進行規範審核及提升產業界工程應用技術與工程人才之培育。
Abstract: The marine meteorological and site specific conditions of offshore wind farms are closely related to the offshore wind turbine installations. With the special geology of Taiwan, environmental extreme conditions as typhoon, wave/current and earthquake are crucial for the performance and structural integrity of offshore wind turbines. Additionally, the water
depth and seabed conditions of Taiwan Strait to the adequacy of various underwater structures and foundations also significantly affect the installation cost and reliability. This project aims to integrate and develop the local key techniques for fixed bottom underwater structures
of offshore wind turbines. The key techniques comprise (1) surveillance, simulation and proactive failure prediction for structural safety of wind turbine tower, (2) surveillance, simulation and prediction for scouring of pile foundations, (3) design and verification technology for offshore wind turbine with fixed bottom underwater structures and foundations, (4) calculation module development of dynamic foundation stiffness for offshore wind turbines. With the integration of structural design, analysis, test and verification/validation, the key techniques of fixed bottom underwater structures and foundations can be developed
to enhance domestic underwater structure and foundation engineering capability in the future. Also, the offshore wind turbines with adequate underwater foundations can be used to ensure the safety, reliability and cost effectiveness. This project is primarily to continue and integrate the dynamic load analysis techniques, structural safety evaluation techniques of wind
tower, scouring analysis of pile foundation and dynamic stiffness of soil, which have been developed in the previous works under the NEP programs. The underwater foundations of monopile, Jacket and gravity based are to be all covered in this work. This project is to introduce
the related technology of the international project OC5, Task 30. By using the scale structural design, dynamic load models can be developed associated with the subsequent tank tests to measure the hydrodynamic parameters to examine and enhance the simulation design models. So the
models can be used to improve the offshore wind turbine and foundation designs. Except the monopile and jacket foundations, this project is to introduce the new technology of hybrid gravity based foundations which are mainly with the large scale wind turbine demand and some limitations of related engineering works. For safety surveillance and simulation of wind tower, the dynamic simulation of offshore wind turbine integrated model will be performed and proactive failure prediction is to be developed with results comparisons. For surveillance and simulation of pile foundation scouring, hydrodynamic analysis is to be performed and the models for prediction can be also developed. Besides, the dynamic foundation stiffness is to be developed with the local offshore wind farm hole drilling soil data. Distributed and coupled dynamic foundation stiffness can be obtained and scale tests are to be conducted. This project with above four work items is for key technology development of fixed bottom underwater structures and foundations of offshore wind turbines. It will be helpful for assisting in the code and approval of government related authorities, upgrading technology for the industrial
engineering applications and nurture the related professional engineers.