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Publications (12)
Previous measurements in homes with respect to dominant turbines indicated the transmissibility factor calculations were a valid technique for describing wind turbine infra-sound penetration at various locations inside homes. However, when several turbines contribute at different RPM’s and/or are not in phase different techniques need to be conside...
In many investigations of wind turbine noise, residents report specific and varying types of audible characteristics. With respect to the subject audible characteristics reported by residents (which are not picked in the dBA Leq measurements) turbines exhibit multiple audible sources at different operating and environmental conditions. Imaging tech...
Complex noises sources are not easily measured when the conditions constantly change. Wind turbines are an example of these challenging sources. Some say it’s like magic; now you hear them and now you don’t. Sound comes and goes and changes with distance, temperature, humidity, wind speed, wind direction, wind shear, thermal inversion, sound absorp...
Penetration of wind turbine blade pass frequencies are compared at different homes and various rooms show how levels change with wind direction and wind speed. Rooms facing turbines exhibited higher penetration compared to basement rooms, indicating air borne transfer paths vs. ground borne vibration. Construction characteristics of different homes...
Infrasonic BPFs from wind turbines do appear as far as 120 km away from the nearest wind turbine at relatively low pressure levels. Previous papers clearly identify BPFs inside homes showing that they are rotational components of wind turbines. Both seismic ground vibration simultaneous to infrasound pressure are measured in the extreme far field i...
Previous measurements using advanced measurement instrumentation and Narrowband 3-dimensional FFT based signal processing indicate the presence at infrasonic blade pass frequencies in dwellings from multiple turbines. New measurements include both near and extreme far field detailing that some homes are highly susceptible while others are not. Prop...
Sound and Vibration Solutions Canada Inc. has had over 35 years' experience in the fields of acoustic and vibration measurement and analysis instrumentation. We are a Canadian manufacturers' representative providing measurement assistance and training of advanced technology. SVS has extensive experience in the area of customized integration for tur...
Previous measurements in homes near wind turbines indicate higher pressure levels below 10Hz than audible pressure levels measured at the same time and location (Dooley and Metelka, ASA 20, 2013). Long term measurements of Infrasoundpressures appear inside multiple homes as wind speed and wind direction vary. Measuring Narrowband signatures identif...
Previous measurements in homes near wind turbines indicate higher pressure levels below 10 Hz than audible pressure levels measured at the same time and location (ASA, vol. 20, 2013 Dooley & Metelka). Blade pass harmonic pressures were proven to be higher relative to basement ground-borne vibration and seismic vibration in floors throughout the hom...
A recently presented hypothesis and model relating to the generation of spinning modes from wind turbines, as a direct result of acoustic interaction involving the tower, also predicts ~20 Hz plus harmonics low frequency amplitude modulated acoustic emissions as a side effect of the acoustic interaction. The low frequency sound is expected to propa...
Relatively balanced load and velocity related pressure waves from the rearward facing surface of each rotor blade, are at a frequency of 1 cycle per revolution of the turbine and are phase shifted by 120 degrees from each other. The superposition of these infrasonic waves destructively interfere. This action results in a non-propagating rotor locke...
Narrowband fast Fourier transform measurements made outside and inside homes indicate that unlike audible tones, low frequency pressure waves penetrate homes virtually un-attenuated. Simultaneous multi-channel linear weighted pressure measurements were made in various locations as well as seismic floor velocities using various dynamic signal analyz...
