Mr. Siavash Shoja Profile

Siavash Shoja

at Chalmers Univ of Technology

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Proceedings Article | 1 April 2016 Presentation + Paper

Effects of temperature variations on guided waves propagating in composite structures

Siavash Shoja, Viktor Berbyuk, Anders Boström

Proceedings Volume 9806, 980605 (2016) https://doi.org/10.1117/12.2218791

KEYWORDS: Wind turbine technology, Composites, Climatology, Signal detection, 3D modeling, Wind energy, Transducers, Wave plates, Sensors, Gaussian filters

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Effects of temperature on guided waves propagating in composite materials is a well-known problem which has been investigated in many studies. The majority of the studies is focused on effects of high temperature. Understanding the effects of low temperature has major importance in composite structures and components which are operating in cold climate conditions such as e.g. wind turbines operating in cold climate regions. In this study first the effects of temperature variations on guided waves propagating in a composite plate is investigated experimentally in a cold climate chamber. The material is a common material used to manufacture rotor blades of wind turbines. The temperature range is 25°C to −25°C and effects of temperature variations on amplitude and phase shift of the received signal are investigated. In order to apply the effects of lowering the temperature on the received signal, the Baseline Signal Stretch (BSS) method is modified and used. The modification is based on decomposing the signal into symmetric and asymmetric modes and applying two different stretch factors on each of them. Finally the results obtained based on the new method is compared with the results of application of BSS with one stretch factor and experimental measurements. Comparisons show that an improvement is obtained using the BSS with the mode decomposition method at temperature variations of more than 25°C.

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