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The Hum is a name often given to widespread reports of a persistent and invasive low-frequency humming, rumbling, or droning noise audible to many but not all people. Hums have been reported all over the world, including the United States, the United Kingdom, Australia and Canada.
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.
The bizarre noises momentarily gained national attention and were reported in the New York Times in April 1992. In a logical conclusion town officials and many residents suspected the source of the hum was a massive $7 million mine ventilation fan with blades 26 feet (7.9 m) in diameter. [16]
Noise that has a frequency spectrum of predominantly zero power level over all frequencies except for a few narrow bands or spikes. Note: An example of black noise in a facsimile transmission system is the spectrum that might be obtained when scanning a black area in which there are a few random white spots. Thus, in the time domain, a few ...
Noise is generated by an internal cooling fan. Electromagnetically induced acoustic noise and vibration (a high-pitched hum or buzz) may be produced, especially at high power, if the cookware has loose parts or if the layers of the pot are not well bonded to each other; cookware with welded-in cladding layers and solid riveting is less likely ...
The father of late pro golfer Grayson Murray is opening up about a conversation he had with his son shortly before his tragic death. In a new interview with Golf Digest, Murray’s family shared ...
A 2021 study found that the treadmill is the most effective cardio machine for weight loss. A trainer explains why—and reveals the best treadmill workouts.
Respiratory sounds, also known as lung sounds or breath sounds, are the specific sounds generated by the movement of air through the respiratory system. [1] These may be easily audible or identified through auscultation of the respiratory system through the lung fields with a stethoscope as well as from the spectral characteristics of lung sounds. [2]
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