Knowra Aircraft noise Aircraft noise Aircraft noise is sound generated by aircraft engines, propellers, rotors, and airflow. Its level and character vary with aircraft design, operating conditions, distance, and surrounding environment.
Jet engine noise : Sound produced by a jet engine, including noise from its exhaust, fan, and compressor. Jet exhaust and rotating engine components are major sources during takeoff.
Noise pollution : Unwanted or harmful sound in the environment that disrupts activity or affects health. Aircraft noise is one source of environmental noise pollution.
Effective perceived noise level : An aircraft-noise metric that accounts for perceived noisiness and tone-related penalties over time. Certification uses this measure to compare aircraft noise under standardized conditions.
Supersonic transport : Passenger air transport at speeds greater than the speed of sound. Supersonic aircraft raise distinctive noise concerns, including sonic booms and louder operations.
Propeller noise : Sound generated by rotating aircraft propellers, including periodic blade tones and turbulent airflow. Propeller rotation creates distinctive tones unlike the broadband roar of jet exhaust.
Noise-induced hearing loss : Permanent hearing impairment caused by damaging exposure to intense sound. High sound levels near aircraft operations can threaten hearing, especially for workers.
A-weighting : A frequency weighting that approximates human hearing sensitivity at moderate sound levels. It is commonly used to report sound levels around airports, though it has limitations.
Electric aircraft : Aircraft propelled partly or entirely by electric motors powered by batteries or other electrical sources. Electric propulsion can reduce engine noise, but propellers and airflow still produce sound.
Helicopter noise : Sound generated by helicopter rotors, engines, and their interaction with surrounding airflow. Rotor blade passage produces the characteristic pulsing often heard from helicopters.
Sleep disturbance : Disruption of sleep caused by environmental or internal factors, including noise. Nighttime overflights can cause awakenings and impair sleep even without conscious recollection.
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