Case Studies
Accurately map wind turbine noise levels
SPLs indicate pitch control operational error or blade install (warping)
SPLs indicate pitch control operational error or blade install (warping)
Easily remove environmental and cultural noises
Detect low levels of turbine sound pressure (SPLs)
Small changes in SPLs from blade to blade with respect to the position of the rotor identify the problem (TEC, Pitch controller, Rotor imbalance)
SPLs indicate pitch control operational error or blade install (warping)
SPLs indicate pitch control operational error or blade install (warping)
SPLs indicate pitch control operational error or blade install (warping)
The Problem:
Blade shown is nearly 50% louder at the top dead center (TDC) position than the other two
No TEC noise or other notable load imbalance
The Solution:
Perform Aeroacoustic Inspection after install to inform defect notification period, exhaust end of warranty inspection, or identify controller error
Case Study Rotor Imbalance:
SPLs indicate unwanted torsional loads acting on the drivetrain:
SPLs indicate unwanted torsional loads acting on the drivetrain:
The Problem:
Narrow band noise identified at multiple bandwidths
Nacelle noise events are controlled by blade up and blade down rotor positions
Unwanted torsional oscillations are the root cause of many drivetrain bearing failures
SPLs indicate unwanted torsional loads acting on the drivetrain:
SPLs indicate unwanted torsional loads acting on the drivetrain:
SPLs indicate unwanted torsional loads acting on the drivetrain:
The Solution:
Inspect the shaft and drivetrain and if needed, rebalance the rotor