基于敲击声振法的风机叶片脱层检测系统设计

Design of Test System for Wind Turbine Blade Delaminates Based on the Vibration Testing

中文关键词:  风机叶片  脱层  声振法  应力持续时间

英文关键词:wind turbine blade  delaminates  acoustic impact  duration of tap stress

中文摘要:

      脱层是风机叶片的主要损伤形式，根据风电叶片的材料特性及外形特点，分析和研究了敲击声振检测原理和现场检测的可行性。叶片出现脱层时，缺陷处刚度下降，敲击应力持续时间增大。依据此检测原理，计算出合理的等效锤头质量，利用压电薄膜作为动态冲击力传感器进行了力锤的结构设计；利用FPGA设计了便携式检测仪，对敲击信号进行信息提取和处理，计算敲击力脉冲信号的宽度，具有结果图形显示和串行通信的功能。经过实验，验证了脉冲宽度与损伤深度的关系。

英文摘要:

      According to material properties and shape features of wind turbine blade，the feasibility of vibration testing principle and field detection is analyzed and researched.When delaminates are appeared，the stiffness of defects is decreased and the duration of tap stress is increased.Based on this principle，the suitable quality of hammer is calculated and the structure is designed by using piezoelectric film as the dynamic impact sensors.Portable testing instrument is manufactured with FPGA，which can extract and process tap signal,calculate the width of stress pulse,and graphical display and communication.The results of experience show the relationship between pulse width and depth of delaminate.