Guided wave-based approach for health monitoring of composite structures; Application to wind turbine blades
Doktorsavhandling, 2018

The use of composite materials has increased in manufacturing of large structures. These structures can be subjected to different types of defects, for which detection has always been a challenge. Wind turbine blades are a perfect example of these large structures that can be exposed to different defects such as delamination, debonding or ice accumulation during the turbine operation. Tools based on guided waves can be used for health monitoring of such structures. The special characteristics of guided wave-based tools such as mobility, rapidity and cost efficiency make them interesting to be used for non-destructive testing and structural health monitoring. Besides these general characteristics, what makes the guided waves a good choice for health monitoring of large structures is that they have the ability to propagate long distances. The size of these structures and their high damping require the use of low frequency guided waves, which are in focus of the present project. The ultimate goal of this work is to investigate the application of guided waves for health monitoring of large composite structures with focus on wind turbine blades. The investigation has been carried out using calculations of dispersion relations and numerical simulations of guided wave propagation in composite materials. In order to make the numerical model computationally efficient, the possibility of using material homogenization methods has been investigated for guided waves propagating in the low range of frequencies. The homogenization methods are aimed at being used for both composite laminates and delamination regions. A similar study is performed on sandwich structures since they are used as parts of large structures. In order to overcome the effects of high attenuation properties of the structures a design optimization method is developed and proposed to create special arrays of transducers for generation of guided waves. The main aim of the designed arrays is to evenly distribute the wave energy in the area of interest in a domain. The developed methods and conclusions have been used to study the propagation of guided waves in wind turbine blades with focus on detection of defects and accumulated ice. The research has been supported by experimental studies for different part of the project. Results show that the developed numerical methods can be used to simulate guided wave propagation in composite laminates. Moreover, the specifically designed arrays of transducers are able to evenly distribute the wave energy in large structures. Finally, it is observed that guided waves can be used to develop multifunctional smart systems for defect and ice detection on wind turbine blades.

structural health monitoring

composite structures

wind turbine blades

design optimization

ice detection

Guided wave propagation

numerical simulations

HA2, Hörsalsvägen 4, Chalmers
Opponent: Prof. Wieslaw Ostachowicz, Institute of Fluid Flow Machinery, Polish Academy of Sciences, Poland.

Författare

Siavash Shoja

Chalmers, Mekanik och maritima vetenskaper, Dynamik

Delamination detection in composite laminates using low frequency guided waves: Numerical simulations

Composite Structures,; Vol. 203(2018)p. 826-834

Artikel i vetenskaplig tidskrift

Guided Wave Energy Transfer in Composite Sandwich Structures and Application to Defect Detection

Shock and Vibration,; Vol. Volume 2018(2018)

Artikel i vetenskaplig tidskrift

Shoja, S., Berbyuk, V., Mustapha, S., Design optimization of transducer arrays for uniform distribution of guided wave energy in arbitrarily shaped domains

Investigating the Application of Guided Wave Propagation for Ice Detection on Composite Materials

In Proc. of the International Conference on Engineering Vibration, Ljubljana, 7 - 10 September ; [editors Miha Boltežar, Janko Slavič, Marian Wiercigroch]. - EBook. - Ljubljana : Faculty for Mechanical Engineering, 2015,; (2015)p. 152-161

Paper i proceeding

Guided wave–based approach for ice detection on wind turbine blades

Wind Engineering,; Vol. 42(2018)p. 483-495

Artikel i vetenskaplig tidskrift

Shoja, S., A guided wave-based transducer array system for structural health monitoring of a wind turbine blade

The use of composite materials has increased in manufacturing of large structures. These structures can be subjected to different types of defects, for which detection has always been a challenge. Wind turbine blades are a perfect example of these large structures that can be exposed to different defects such as delamination, debonding or ice accumulation during the turbine operation. Tools based on ultrasonic guided waves can be used for health monitoring of such structures. The special characteristics of guided wave-based tools such as mobility, rapidity and cost efficiency make them interesting to be used for non-destructive testing and structural health monitoring. This work focuses on investigating the applications of ultrasonic guided waves to defect and ice detection on composite materials. The methodology is based on computer simulations of wave propagation in large composite structures as well as experimental work on different defect and ice detection scenarios. The developed methods have the potential to be used to design multifunctional intelligent detection systems for wind turbines.

Drivkrafter

Hållbar utveckling

Innovation och entreprenörskap

Ämneskategorier

Teknisk mekanik

Energiteknik

Kompositmaterial och -teknik

Styrkeområden

Energi

Materialvetenskap

Infrastruktur

C3SE (Chalmers Centre for Computational Science and Engineering)

ISBN

978-91-7597-821-5

Doktorsavhandlingar vid Chalmers tekniska högskola. Ny serie: Doktorsavhandlingar vid Chalmers tekniska hogskola Ny serie nr. 4502

Utgivare

Chalmers tekniska högskola

HA2, Hörsalsvägen 4, Chalmers

Opponent: Prof. Wieslaw Ostachowicz, Institute of Fluid Flow Machinery, Polish Academy of Sciences, Poland.

Mer information

Senast uppdaterat

2018-11-15