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Feasibility study on a strain based deflection monitoring system for wind turbine blades
- Source :
- Mechanical Systems and Signal Processing. 82:117-129
- Publication Year :
- 2017
-
Abstract
- The bending stiffness of the wind turbine blades has decreased due to the trend of wind turbine upsizing. Consequently, the risk of blades breakage by hitting the tower has increased. In order to prevent such incidents, this study proposes a deflection monitoring system that can be installed to already operating wind turbine's blades. The monitoring system is composed of an estimation algorithm to detect blade deflection and a wireless sensor network as a hardware equipment. As for the estimation method for blade deflection, a strain-based estimation algorithm and an objective function for optimal sensor arrangement are proposed. Strain-based estimation algorithm is using a linear correlation between strain and deflections, which can be expressed in a form of a transformation matrix. The objective function includes the terms of strain sensitivity and condition number of the transformation matrix between strain and deflection. In order to calculate the objective function, a simplified experimental model of the blade is constructed by interpolating the mode shape of a blade from modal testing. The interpolation method is effective considering a practical use to operating wind turbines' blades since it is not necessary to establish a finite element model of a blade. On the other hand, a sensor network with wireless connection with an open source hardware is developed. It is installed to a 300 W scale wind turbine and vibration of the blade on operation is investigated.
- Subjects :
- Engineering
Wind power
Turbine blade
business.industry
020209 energy
Mechanical Engineering
Modal testing
Aerospace Engineering
02 engineering and technology
Structural engineering
021001 nanoscience & nanotechnology
Turbine
Finite element method
Computer Science Applications
law.invention
Vibration
Control and Systems Engineering
Deflection (engineering)
law
Bending stiffness
Signal Processing
0202 electrical engineering, electronic engineering, information engineering
0210 nano-technology
business
Civil and Structural Engineering
Subjects
Details
- Language :
- English
- Volume :
- 82
- Database :
- OpenAIRE
- Journal :
- Mechanical Systems and Signal Processing
- Accession number :
- edsair.doi.dedup.....460be7a2f41a814a6ddef1000f7b734d