Identification of Damage Using Lamb Waves

Su, Zhongqing; Ye, Lin

doi:10.1007/978-1-84882-784-4

Cited by 470 publications

(365 citation statements)

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“…Details of how to calculate these constants can be found in Tada et al (2000). Applying the boundary conditions in Eq.…”

Section: Spectral Finite Element Methods For Beam Modelingmentioning

confidence: 99%

“…The Wavelet Transform has been used in various areas to analyze nonstationary signals which require time-frequency domains representation. Sun et al (2002) used the wavelet packet transform for damage assessment of structures, with good results. However, a drawback of the wavelet package is the needed computational effort and memory capacity to perform detail and approximation coefficients decompositions to each level.…”

Section: Introductionmentioning

confidence: 99%

“…Lamb wave based NDE is affected by two main concerns: the change of piezoelectric transducer properties and the Lamb wave propagation behavior. Su et al (2009) investigated the effect of temperature on Lamb wave propagation observing that when the ambient temperature increases from 25°C to 50°C the S0, A0 and SH0 modes decrease only 1.27%, 1.27% and 1.68%. Sihori et al (2000) presented a study about the changes in the piezoelectric properties of piezoelectric elements as strain sensors concluded that there is no need to apply special corrections in sensor output over a moderate range of operating temperatures.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A fault location method using Lamb waves and discrete wavelet transform

Souza¹,

Nóbrega²

2012

J. Braz. Soc. Mech. Sci. & Eng.

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“…Details of how to calculate these constants can be found in Tada et al (2000). Applying the boundary conditions in Eq.…”

Section: Spectral Finite Element Methods For Beam Modelingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A fault location method using Lamb waves and discrete wavelet transform

Souza¹,

Nóbrega²

2012

J. Braz. Soc. Mech. Sci. & Eng.

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“…Lamb waves, also known as guided waves, can be defined as a type of ultrasonic elastic wave propagating in a solid medium and guided between two parallel free surfaces, such as the upper and lower surface of a thin plate [1,2]. Their propagation is dispersive, meaning that the wave's velocity varies with the plate thickness and the frequency at which they are generated, and that different modes (groups of waves with different particle motion and velocities) can exist simultaneously.…”

Section: Principle Of Lamb Wave Testing With Piezoelectric Transducersmentioning

confidence: 99%

Structural Health Monitoring Using Lamb Wave Reflections and Total Focusing Method for Image Reconstruction

et al. 2016

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This investigation aimed to adapt the total focusing method (TFM) algorithm (originated from the synthetic aperture focusing technique in digital signal processing) to accommodate a circular array of piezoelectric sensors (PZT) and characterise defects using guided wave signals for the development of a structural health monitoring system. This research presents the initial results of a broader study focusing on the development of a structural health monitoring (SHM) guided wave system for advance carbon fibre reinforced plastic (CFRP) composite materials. The current material investigated was an isotropic (aluminium) square plate with 16 transducers operating successively as emitter or sensor in pitch and catch configuration enabling the collection of 240 signals per assessment. The Lamb wave signals collected were tuned on the symmetric fundamental mode with a wavelength of 17 mm, by setting the excitation frequency to 300 kHz. The initial condition for the imaging system, such as wave speed and transducer position, were determined with post processing of the baseline signals through a method involving the identification of the waves reflected from the free edge of the plate. The imaging algorithm was adapted to accommodate multiple transmitting transducers in random positions. A circular defect of 10 mm in diameter was drilled in the plate, which is similar to the delamination size introduced by a low velocity impact event in a composite plate. Images were obtained by applying the TFM to the baseline signals, Test 1 data (corresponding to the signals obtained after introduction of the defect) and to the data derived from the subtraction of the baseline to the Test 1 signals. The result shows that despite the damage diameter being 40 % smaller than the wavelength, the image (of the subtracted baseline data) demonstrated that the system can locate where the waves were reflected from the defect boundary. In other words, the contour of the damaged area was highlighted enabling its size and position to be determined.Appl Compos Mater (2017) 24:553-573 DOI 10.1007/s10443-016-9549-

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“…At each frequency, the wavenumber is modified in order to find the roots of the Eq's. (3.5a) and (3.5b) (Su and Ye 2009). The dispersion curves can be plotted by joining the roots of the different wave modes.…”

Section: Dispersion Curvesmentioning

confidence: 99%

Damage Sensing in Blades

Crespo

2016

Mare-Wint

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This chapter is divided into three parts; the problem, possible solutions and the chosen option to address the problem, which is my PhD topic within the project MAREWINT. So firstly, the chapter presents an overview of the typical damages that a wind turbine blade can suffer during its life operation. Then, a review of different Structural Health Monitoring (SHM) techniques which are currently being investigated for wind turbine blades is presented. Finally, the chapter provides the state-of-the-art of Guided Wave Technology in composite materials; where different aspects of this SHM technique are explained in more detail. IntroductionWind energy is an important renewable energy source which has gained high relevance during the last decades. Different countries have released plans to invest in wind energy in the future years; such as the USA that will generate 20 % of the country's electricity from wind power by 2030 or Denmark that have set the targets of producing 50 % of the power from the wind by 2020 and also of making Denmark completely free of dependence on fossil fuels by 2050. So, the use of wind power is not expected to decrease within the next decade (Márquez et al. 2012). The trend is to manufacture bigger wind turbines and deploy them offshore. These new wind turbines have around 6 MW power output, 120-metre height tower and 80-metre long blades. They are designed to be operating in rough conditions in difficult-to-reach areas. Therefore, the deployment of Structural Health Monitoring (SHM) techniques becomes essential in order to assess remotely the integrity of the structure. The advantages of using these techniques are many (Schulz and Sundaresan 2006), such as reducing expensive costs for periodic inspections of turbines which are hard to reach, prevention of unnecessary replacement of components based on time of use, or minimizing down time and frequency of sudden breakdowns.

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Identification of Damage Using Lamb Waves

Cited by 470 publications

References 0 publications

A fault location method using Lamb waves and discrete wavelet transform

A fault location method using Lamb waves and discrete wavelet transform

Structural Health Monitoring Using Lamb Wave Reflections and Total Focusing Method for Image Reconstruction

Damage Sensing in Blades

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