Sound Reasearch in Precessional Transmission

Abstract:

Sound may be defined as any pressure variation (in air, water or other medium) that the human ear can detect. Just like dominoes, a wave motion is set off when an element sets the nearest particle of air into motion. This motion gradually spreads to adjacent air particles further away from the source. Depending on the medium, sound propagates at different speeds. In air, sound propagates at a speed of approximately 340 m/s. In liquids and solids, the propagation velocity is greater 1500 m/s in water and 5000 m/s in steel [2].

• Periodical: Applied Mechanics and Materials (Volume 657)
• Pages: 584-588
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.657.584
• Online since: October 2014
• Authors: Iulian Malcoci*
• Keywords: Average Noise Level, Background Noise, Brüel & Kjær, Decibel (dB), Precessional Reducer, Sound Meter Analyzer, Sound Pressure Level (SPL)

References

[1] I. Bostan, Precesional transmission with multipair gearing, (1991) 196-210.

[2] Measuring Sound (1984) available at http: /www. bksv. com/doc/br0047. pdf, accesed 20. 11. (2009).

[3] Vibration Measurement (1982) available at http: /www. bksv. com/doc/br0094. pdf, accesed 20. 11. (2009).

[3] I. Malcoci, Precessional transmission sound reaserch, Technical University of Moldova Magazine Meridian Ingineresc. 4 (2013) 64-69.

[4] I. Malcoci, What is noise?, Journal of Physics and Applied Mathematics Cygnus. 1(10) (2009) 7-9.