The project will improve the precision of statements on noise from wind turbines. A method for measurement of noise immission (the subjective perception of noise) is developed; an existing prediction method for sound propagation is validated, adjusted and programmed, and knowledge on uncertainty upon noise emission from wind turbines is gained. The project has five major areas:

1. Test methods for reducing wind-induced noise in the measuring microphone, which is the main obstacle for noise immission measurements.
2. Validation of propagation model for wind turbine noise. At seven different sites propagation of wind turbine noise is measured and results are compared to the existing propagation model.
3. Round Robin test of noise emission. Five partners measure the noise emission from the same wind turbine.
4. Investigation of uncertainty components in emission measurements. The results are summarised with results from JOU2-CT90-0124 and the Round Robin test to give a comprehensive description of uncertainty upon noise emission.
5. Acceptability of wind turbine noise is investigated in a pilot study based on listening tests.