预应力装配式叶片连接单元状态监测

提出了一种基于压电陶瓷激励与传感技术的预应力装配式风电叶片连接单元的状态监测方法。通过逐级施加螺栓预拉力对连接单元进行安装,再对连接段施加轴心拉力直至试件破坏,将压电陶瓷片粘贴在连接单元两侧分别作为驱动端和接收端,对受力全过程进行监测。比较不同激励信号下各阶段测量信号基于小波包分析的健康指标的变化,发现在连接界面脱开时信号出现明显衰减。该文的方法可实现装配式风力发电机叶片连接段状态的有效监测。

Condition Monitoring for a Prefabricated Sectional Wind Turbine Blade With Prestressed Connection Specimen Based on PZT

In this study, a condition monitoring approach for the prefabricated sectional wind turbine blade with prestressed connection based on PZT is proposed and validated experimentally. The PZT actuator and sensor are mounted on the surface of the connection member to monitor the condition of the connection member which is firstly fabricated with prestressed bolts and then applied with incremental axial tensile force. A health index defined with the wavelet packet analysis on the PZT measurement is employed to monitor the connection condition. The results show that the index is related to the connection condition and changes obvious due to the separation of the connection under axial force. The proposed method is effective in condition monitoring for the prefabricated sectional wind turbine blade with prestressed connection.