Structural Health Monitoring of Wind Turbine Blades

  • Hui LiEmail author
  • Wensong Zhou
  • Jinlong Xu
Part of the Advances in Industrial Control book series (AIC)


Wind turbine blades usually achieve a very long operating life of 20–30 years. During their operation, the blades encounter complex loading with a high number of cycles as well as severe weather. All of these factors result in accumulated damage, acceleration of fatigue damage, and even sudden blade failure, which can cause catastrophic damage to the wind turbine. In recent years, many structural health monitoring (SHM) techniques, including global and local methods, have been developed and applied as important and valid tools to detect the damage of wind turbine blades. This chapter provides a comprehensive review and analysis on the state of the art of SHM for blades. Then, the SHM techniques are described in detail. For the global method, this chapter discusses mainly the vibration-based damage detection problem for wind turbine blades given the rotation effects. For the local methods, a fatigue damage detection system used for wind turbine blade is developed using high spatial resolution differential pulse-width pair Brillouin optical time-domain analysis (DPP-BOTDA) sensing system and PZT sensors is introduced to detect the tiny damage under static loading.


Wind turbine blades Damage detection Vibration-based method DPP-BOTDA PZT 



Section area of elements


The largest length of the signal curve of every time series as the interval time is k


The length of the signal curve which pass through no damaged region as the interval time is k


System damping matrix


Elastic modulus, the residual error


The largest value of estimated FD of the curve of each time series


FD-based damage acuteness index


System stiffness matrix


The structural stiffness


The additional stiffness


Is the normal modal stiffness matrix


The stiffness matrix of the geometric nonlinearities


The length of time series of PZT signal


System mass matrix


The degrees of freedom of the structure, the refractive index of the fiber core


The damage index based on PCA method


The mean value of NI




The loading matrix


The displacement in x direction


The external force


The velocity of the acoustic wave


The Brillouin frequency shift


The displacement in y direction


The scores matrix


The reconstructed data


The compressed data


The displacements of the degrees of freedom of the structure


The velocities of the degrees of freedom of the structure

\(\mathop Z\limits^{..}\)

The accelerations of the degrees of freedom of the structure


The potential energy of strain


The modal coordinate, the first Rayleigh damping coefficients


The second Rayleigh damping coefficients


The normal strain


The eigenvalues, the vacuum wavelength of the pump light


Standard deviation


The angular frequency


The Gauss’ notation


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Copyright information

© Springer International Publishing Switzerland 2014

Authors and Affiliations

  1. 1.School of Civil EngineeringHarbin Institute of TechnologyHarbinChina

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