Field Measurements in the Development of Methods for the Assessment of Low Frequency Noise

Noise Notes ◽  
2008 ◽  
Vol 7 (2) ◽  
pp. 33-44
Author(s):  
Waddington ◽  
Moorhouse ◽  
Adams
Keyword(s):  
Low Frequency ◽  
Field Measurements ◽  
Frequency Noise ◽  
Low Frequency Noise

Field Measurement of Wayside Low-Frequency Noise Emitted from Tunnel Portals and Trains of High-Speed Railway

2005 ◽  
Vol 24 (4) ◽  
pp. 219-231 ◽  
Author(s):  
K. Kikuchi ◽  
M. Iida ◽  
T. Takasaki ◽  
H. Takami
Keyword(s):  
High Speed ◽  
Near Field ◽  
Low Frequency ◽  
Hydrodynamic Pressure ◽  
Field Measurements ◽  
Frequency Noise ◽  
Pressure Waves ◽  
Low Frequency Noise ◽  
Open Section ◽  
Tunnel Portal

In order to determine the actual circumstances of wayside low-frequency noise and infrasound generated by high-speed trains (Shinkansen), field measurements were performed at two sites, one near a tunnel portal and the other in a fully open section. The measurements were based upon the manual issued by the Ministry of the Environment of Japan in October 2000 and conducted to obtain G-weighted SPL, 1/3-octave band spectra, velocity dependence and distance attenuation of SPL. The measured results show that major components of the low-frequency noise from the tunnel portal are impulsive micro-pressure waves and continuous pressure waves, while those in the open section are near-field hydrodynamic pressure variations and far-field acoustic pressure waves.

Estimating the Quality of Thermionic Cathodes for Microwave Vacuum Tubes Using the Low-Frequency Noise Parameters

Vestnik MEI ◽  
2018 ◽  
Vol 5 (5) ◽  
pp. 120-127
Author(s):  
Mikhail D. Vorobyev ◽  
◽  
Dmitriy N. Yudaev ◽  
Andrey Yu. Zorin ◽  
◽  
...  
Keyword(s):  
Low Frequency ◽  
Frequency Noise ◽  
Low Frequency Noise ◽  
Noise Parameters ◽  
Thermionic Cathodes ◽  
Vacuum Tubes

Simulation of Low Frequency Noise in a CCTWT

1999 ◽  
Author(s):  
Charles K. Birdsall ◽  
J. P. Varboncoeur ◽  
P. J. Christensen
Keyword(s):  
Low Frequency ◽  
Frequency Noise ◽  
Low Frequency Noise

Impacts of low-frequency noise from industrial sources in residential areas

2021 ◽  
Vol 182 ◽  
pp. 108203
Author(s):  
Lígia T. Silva ◽  
Alda Magalhães ◽  
José Ferreira Silva ◽  
Fernando Fonseca
Keyword(s):  
Low Frequency ◽  
Frequency Noise ◽  
Low Frequency Noise ◽  
Residential Areas ◽  
Industrial Sources
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