海上风力发电基础结构动力特性及健康监测关键技术研究

Offshore wind energy has a broad prospect of application as a green pollution-free clean energy. The offshore wind turbine (OWT) structures are the basic facilities for offshore wind energy exploration. During their service lives, damages of the foundation structures are unavoidable for the harsh ocean environment. The structure health monitoring technology which can evaluate structures' conditions is very necessary to ensure the safety, lower the maintenance cost and prolong the service lives. The program focuses on the tripod and jacket type offshore wind turbines which are suitable for deeper waters and larger capacity turbines, and studies the key issues of dynamic characteristics and health monitoring technology of offshore wind turbine by means of theoretical analysis, numerical simulation and model testing. First, a simplified model is going to be proposed to reveal the relationship between foundation and natural frequencies and determine the influences of design parameters of the foundation structure to the natural frequencies of whole structure. Then, the dynamic responses of OWT foundations under various excitations are going to be studied as well as the coupling effects of different loads. Based on the results, the key monitoring areas will be defined. Combining the method dealing with incomplete measured modal data, a new damage detection technology based on vibration testing is going to be developed, providing scientific basis and technical support for safety assessment of offshore wind turbine.

海洋风能作为一种绿色无污染的清洁能源，具有广阔的应用前景。海上风力发电结构是海洋风能开发的基础性设施，其基础结构长期服役于恶劣的海洋环境中，损伤难以避免。对结构损伤进行评估的结构健康监测技术研究对于确保海上风电结构安全，降低维修成本以及延长服役期限是非常必要的。本项目针对于适用于较深水域及较大容量风电机组的三脚架式和导管架式海上风电基础结构，通过理论分析、数值模拟、模型实验等手段，对海上风电基础结构的动力特性和健康监测中的关键问题进行研究。通过建立海上风电整体结构的简化力学模型，从理论上揭示基础结构与结构固有频率的关系，确定基础结构各设计参数对整体固有频率的影响；开展海上风电基础结构在不同动力荷载作用下的动力响应研究，分析不同荷载的耦合效应，并确定风电基础结构的重点监测区域；结合实测信息不完备处理方法，发展基于振动测试的损伤检测技术，为海上风电基础结构的安全性评估提供科学依据和技术支持。

海洋风能作为一种绿色无污染的清洁能源，具有广阔的应用前景。海上风力发电结构是海洋风能开发的基础性设施，其基础结构长期服役于恶劣的海洋环境中，损伤难以避免。对结构损伤进行评估的结构健康监测技术研究对于确保海上风电结构安全，降低维修成本以及延长服役期限是非常必要的。本项目针对于固定式海上风电基础结构，通过理论分析、数值模拟、模型实验等手段，对海上风电基础结构的动力特性和健康监测中的关键问题进行研究。建立了海上风电结构的力学简化模型，分析了基础结构各设计参数对结构基频的影响。进行了海上风电结构在多种荷载要素联合作用下的动力响应研究，确定了结构重点监测区域。发展了基于实测数据的海上风电结构模态参数识别和损伤检测技术，为海上风电结构物的健康监测/检测提供科学依据和技术支持。