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Title: Small Wind Turbine Tower Vibration and Noise Emission
Author: Mollasalehi, Ehsan
Advisor: Wood, David
Sun, Qiao
Keywords: Applied Mechanics;Engineering--Mechanical
Issue Date: 25-Jan-2013
Abstract: A major barrier to the acceptance of small wind turbines is that they are perceived to be noisy particularly when mounted on monopole towers rather than traditional guy-wired ones. This research discusses an aspect of noise propagation that has not been studied previously: vibration and noise emission of the tower and consists of three main steps; first, vibration measurements from 24 accelerometers placed on the 10.2 m tower of a Skystream 2.4 kW wind turbine by which natural frequencies and corresponding deflection shapes were calculated. Second, the results from the survey were used to verify the predictions of a finite element model of the tower structure. And lastly, the verified model was placed in the air domains such that the structural vibration generates sound waves. Experiments showed that most of vibration energy is engaged in very low frequency band (10 Hz). It was found that wind itself can only excite first two bending modes. On the other hand, emitted noise from the tower at large distances can be neglected while close to the tower can reach to 30 dB.
Appears in Collections:Electronic Theses

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