Acoustic sound and vibration monitoring
Vibrations from all the rotating components within the nacelle were monitored through the airborne noise generated by the surface vibrations of the machinery.
The noise was detected by acoustic pressure sensors (microphones) mounted at the nacelle inner surface.
Unlike contact sensors, which cover only the small portion of their contact area, these microphone sensors are able to monitor up to 75% of the noise emitted from the machine surfaces. The developed non-contact sensor array consists of a group of five acoustic pressure sensors arranged in a manner which allow its easy installation and set-up.
Field trials
To determine the feasibility of the non-contact technique, acoustic sound and vibration monitoring were carried out during the UK-based turbine’s normal operation. An array of five acoustic pressure sensors and two accelerometers was installed. In addition to acoustic sound and vibration data, parametric data, ie wind speed and power output, were obtained for correlation with the acquired data, as shown in Figure 4.
For further information about the project, please visit the project website: www.cmdrive.co.uk.
If you would like further details, please email contactus@twi.co.uk