Noise Radiation from Single and Multiple Rods Configurations

2006 ◽  
Author(s):  
Florence Hutcheson ◽  
Thomas Brooks
Keyword(s):  
Noise Radiation

scholarly journals Vibration Response and Noise Radiation of Engine Block Coupled with the Rotating Crankshaft and Gear Train

2011 ◽  
Vol 6 (4) ◽  
pp. 765-777 ◽  
Author(s):  
Kazuhide OHTA ◽  
Kouichiro IKEDA ◽  
Guangze ZHENG ◽  
Takahiro OKIMOTO ◽  
Iwao HONDA
Keyword(s):  
Vibration Response ◽  
Gear Train ◽  
Engine Block ◽  
Noise Radiation

Noise radiation from moving surfaces

2001 ◽  
Vol 25 (9) ◽  
pp. 725-740 ◽  
Author(s):  
Heinz Antes ◽  
Jens Baaran
Keyword(s):  
Noise Radiation

scholarly journals ON APPLICABILITY OF ADDITIVE TECHNOLOGY IN PRODUCING NOZZLES FOR JET NOISE INVESTIGATIONS

Akustika ◽  
2019 ◽  
Vol 34 ◽  
pp. 180-184 ◽  
Author(s):  
Igor Khramtsov ◽  
Evgeniya Cherenkova ◽  
Vadim Palchikovskiy ◽  
Oleg Kustov
Keyword(s):  
Sound Pressure ◽  
Small Diameter ◽  
Jet Noise ◽  
Additive Technology ◽  
Noise Radiation ◽  
Fused Deposition ◽  
Air Jet ◽  
Power Spectral ◽  
Noise Measurements ◽  
Jet Velocities

The split-type conical nozzles with replaceable exit sections with diameters of 30, 40 and 50 mm were designed and produced from steel by machine turning. In addition, the replaceable output parts of the nozzles with the same diameters were produced by additive technology (fused deposition manufacturing) from ABS plastic. In the acoustic anechoic chamber, the noise measurements of a single-stream cold air jet for all the nozzles at jet velocities in the range of 0.3-0.7 Mach numbers were carried out. The noise measurements were performed on distance of 2 m from the center of the nozzle exit section at angles from 30 to 105o. For different directions of noise radiation and different velocities of the jet, the power spectral density and overall sound pressure level were determined. The obtained results demonstrates that the jet noise for nozzles with diameter of 40 and 50 mm from steel and ABS plastic differs by no more than 1 dB, which is within the measurement error for these types of experiments. The nozzles with diameter 30 mm have a higher difference in noise, which can be explained by the more sensitivity of a nozzle with a small diameter to the deviations of geometric parameters when it produced by additive technology.

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