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  2. The Hum - Wikipedia

    en.wikipedia.org/wiki/The_Hum

    A steel mill operated by U.S. Steel was the possible cause, but officials stated that no new equipment had been installed or activated around the time that the noise became noticeable. When the blast furnaces were deactivated in April 2020, the noise went away as well. [13] [14]

  3. Electromagnetically induced acoustic noise - Wikipedia

    en.wikipedia.org/wiki/Electromagnetically...

    The torsional deflection of a simple cylinder cannot radiate efficiently acoustic noise, but with particular boundary conditions the stator can radiate acoustic noise under torque ripple excitation. [8] Structure-borne noise can also be generated by torque ripple when rotor shaft line vibrations propagate to the frame [9] and shaft line.

  4. Physics of whistles - Wikipedia

    en.wikipedia.org/wiki/Physics_of_whistles

    Human whistle sound. The number and variety of whistles created by humans is quite large, yet very little study has been done on human whistling from a physics perspective. There are three possible mechanisms: Helmholtz resonance, symmetric hole tone operation (monopole), or asymmetric edge tone operation (dipole).

  5. List of onomatopoeias - Wikipedia

    en.wikipedia.org/wiki/List_of_onomatopoeias

    This is an accepted version of this page This is the latest accepted revision, reviewed on 14 January 2025. This is a list of onomatopoeias, i.e. words that imitate, resemble, or suggest the source of the sound that they describe. For more information, see the linked articles. Human vocal sounds Achoo, Atishoo, the sound of a sneeze Ahem, a sound made to clear the throat or to draw attention ...

  6. List of unexplained sounds - Wikipedia

    en.wikipedia.org/wiki/List_of_unexplained_sounds

    This sound, dubbed the Whistle, was recorded by the eastern Pacific autonomous hydrophone deployed at on July 7, 1997 at 07:According to NOAA, the Whistle is similar to volcanogenic sounds previously recorded in the Mariana volcanic arc of the Pacific Ocean.

  7. Furnace (central heating) - Wikipedia

    en.wikipedia.org/wiki/Furnace_(central_heating)

    However, the simplicity of single-stage gas furnaces come at the cost of blower motor noise and mechanical inefficiency. The blower motors on these single-stage furnaces consume more energy overall because, regardless of the heating requirements of the space, the fan and blower motors operate at a fixed-speed.

  8. Steam whistle - Wikipedia

    en.wikipedia.org/wiki/Steam_whistle

    A whistle is a quarter-wave generator, which means that a sound wave generated by a whistle is about four times the whistle length. If the speed of sound in the steam supplied to a whistle were 15936 inches per second, a pipe with a 15-inch effective length blowing its natural frequency would sound near middle C: 15936/(4 x

  9. Whistler (radio) - Wikipedia

    en.wikipedia.org/wiki/Whistler_(radio)

    Mallinckrodt heard some whistling sounds and brought them to Helliwell's attention. [8] As Helliwell recalled in an article in the October 1982 issue of the Stanford Engineer , he initially thought it was an artifact , but stood radio watch with Mallinckrodt until he heard the whistlers himself.

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