enow.com Web Search

Search results

  1. Results from the WOW.Com Content Network
  2. Jet noise - Wikipedia

    en.wikipedia.org/wiki/Jet_noise

    The primary sources of jet noise for a high-speed air jet (meaning when the exhaust velocity exceeds about 100 m/s; 360 km/h; 225 mph) are "jet mixing noise" and, for supersonic flow, shock associated noise. Acoustic sources within the "jet pipe" also contribute to the noise, mainly at lower speeds, which include combustion noise, and sounds ...

  3. Aircraft noise pollution - Wikipedia

    en.wikipedia.org/wiki/Aircraft_noise_pollution

    Noise-generating aircraft propeller. Aircraft noise is noise pollution produced by an aircraft or its components, whether on the ground while parked such as auxiliary power units, while taxiing, on run-up from propeller and jet exhaust, during takeoff, underneath and lateral to departure and arrival paths, over-flying while en route, or during landing.

  4. Environmental impact of aviation - Wikipedia

    en.wikipedia.org/wiki/Environmental_impact_of...

    The FAA Stage 5 noise standards are equivalent. [49] Higher bypass ratio engines produce less noise. The PW1000G is presented as 75% quieter than previous engines. [50] Serrated edges or 'chevrons' on the back of the nacelle reduce noise. [51] A Continuous Descent Approach (CDA) is quieter as less noise is produced while the engines are near ...

  5. Experts split over noise rules for supersonic jet comeback - AOL

    www.aol.com/news/experts-split-over-noise-rules...

    Nearly two decades after the last flight of Anglo-French Concorde, a panel of United Nations aviation experts is meeting from Monday and will consider updating a decades-old supersonic noise ...

  6. Airplane noise continues to wreak havoc on North Jersey ... - AOL

    www.aol.com/airplane-noise-continues-wreak-havoc...

    Canestrino also reported that noise levels are up from last year, with a monitor affixed near the top of the hospital averaging noise data of 62.6 decibels in May 2024, compared to 59.5 decibels ...

  7. Silent Aircraft Initiative - Wikipedia

    en.wikipedia.org/wiki/Silent_Aircraft_Initiative

    This gives a less effective exhaust gas velocity (lower jet noise) and therefore lower efficiency, and can be achieved in the landing phase by using a variable area final nozzle to rematch the fan. Furthermore, acoustic treatment in the intake and exhaust ducting can minimize turbomachinery noise.

  8. Noise control - Wikipedia

    en.wikipedia.org/wiki/Noise_control

    As in the case of roadway noise, little progress has been made in quelling aircraft noise at the source, other than elimination of loud engine designs from the 1960s and earlier. Because of its velocity and volume, jet turbine engine exhaust noise defies reduction by any simple means.

  9. Aeroacoustics - Wikipedia

    en.wikipedia.org/wiki/Aeroacoustics

    Aeroacoustics is a branch of acoustics that studies noise generation via either turbulent fluid motion or aerodynamic forces interacting with surfaces. Noise generation can also be associated with periodically varying flows. A notable example of this phenomenon is the Aeolian tones produced by wind blowing over fixed objects.