Wind turbine Sound power and tonality measurement IEC 61400-14
IEC 61400-14 is part of the IEC 61400 series of standards and describes the requirements for measuring and evaluating the sound power and tonality of wind turbines. The standard specifies the procedures for measuring and evaluating the sound emissions of wind turbines to ensure that they meet the legal requirements for sound insulation. The sound power and tonality of wind turbines are important factors to consider when evaluating the sound emanating from the turbines.
Sound power refers to the total amount of sound emitted by a wind turbine and is commonly expressed in decibels (dB). Sound power depends on several factors, such as the size of the turbine, rotor speed, and wind speed.
Tonal content of wind turbines refers to the tonal character of the sound and is often referred to as the "tonal component." Tonality occurs when the WTGs produce sound that consists of a single frequency or a series of frequencies at certain speeds or wind speeds. This can be perceived as a buzzing or humming noise and can be particularly annoying to nearby residents.
ISO 61400-14 is an important standard for the wind energy industry because it helps ensure that sound emissions from wind turbines are measured and evaluated in a standardized way. The standard is used by wind turbine manufacturers, wind farm operators and regulatory authorities worldwide.