Characterization of sound emitted by wind machines used for frost control
Keywords:Aerodynamics, Buildings, Floors, Frost effects, Roofs, Frost control, Mechanical effects, Wind machines
AbstractCharacterization of sound emitted by wind machines used for frost control are studied. Noise from wind machines is due to both aerodynamic and mechanical effects, but aerodynamic sounds are considered to be the most significant. The orientation of the fan changes as the sound pressure level at a fixed point in the far field changes. The sound levels vary in a sinusoidal fashion, the period being of the order of a few minutes, level changes of up to 11 dBA have been measured. Low frequency and infrasonic energy from wind machines is capable of exciting components such as floors, walls roofs and windows that comprise a building structure, thus causing increased annoyance potential.
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