Experimental Identification of Noise Radiation Characteristics and Noise Reduction in a Multi-Stage Centrifugal Air Compressor

2020 ◽  
Vol 44 (4) ◽  
pp. 301-312
Author(s):  
Je-Heon Han ◽  
Yaying Niu ◽  
Changwoo Lim
Keyword(s):  
Noise Reduction ◽  
Radiation Characteristics ◽  
Air Compressor ◽  
Noise Radiation ◽  
Experimental Identification ◽  
Multi Stage

scholarly journals Fault feature extraction for rolling element bearing diagnosis based on a multi-stage noise reduction method

Measurement ◽  
2019 ◽  
Vol 139 ◽  
pp. 226-235 ◽  
Author(s):  
Junchao Guo ◽  
Dong Zhen ◽  
Haiyang Li ◽  
Zhanqun Shi ◽  
Fengshou Gu ◽  
...  
Keyword(s):  
Feature Extraction ◽  
Noise Reduction ◽  
Reduction Method ◽  
Rolling Element Bearing ◽  
Multi Stage ◽  
Rolling Element ◽  
Element Bearing ◽  
Fault Feature Extraction

A discussion on the origin and treatment of noise in industrial environments - Noise reduction on road-breaking drills

1968 ◽  
Vol 263 (1142) ◽  
pp. 425-439
Keyword(s):  
Noise Reduction ◽  
Present Level ◽  
Noise Radiation ◽  
Industrial Environments ◽  
Proper Perspective

The noise generated by impulsive road-breakers is probably the most annoying part of the noise generated at construction and demolition sites and at roadworks. The problem was put into its proper perspective in the Wilson Committee’s report on the problem of noise (1963). It was shown by implication there that orthodox pneumatic road-breakers were unacceptable as far as noise is concerned, a reduction of some 7 to 1 5 dB(A) being desirable (i.e. from a present level of 82 to 85 dB(A) at 50 ft. radius to a level of 70 to 75 dB(A) outside the nearest window). Hydraulic road-breakers available at that time were as noisy as their pneumatic counterparts but were considerably more powerful. Electric and hydraulic breakers commercially available now (1967) are, as will be seen, considerably quieter than pneumatic drills. The use of an enclosure for the operator was encouraged in the Wilson report and the reductions in the noise radiation so obtained are quite high, but this device is in some ways difficult for the contractor. The breaker is usually working at an edge beyond which is broken rubble or a hole. It is difficult then to move the enclosure on its wheels over such terrain.

Active Control of Structure-Borne Road Noise Using Vibration Actuators

1998 ◽  
Vol 120 (2) ◽  
pp. 517-523 ◽  
Author(s):  
W. Dehandschutter ◽  
P. Sas
Keyword(s):  
Noise Reduction ◽  
Laboratory Experiments ◽  
Frequency Range ◽  
Road Noise ◽  
Control Approach ◽  
Noise Radiation ◽  
Acoustic Control ◽  
Numerical Tools ◽  
Control Set ◽  
Set Up

Structure-borne road noise is generated by road induced excitation forces. The control approach presented here relies on the use of vibration actuators to modify the vibration behavior of the car body such that its noise radiation efficiency is decreased (Active Structural Acoustic Control—ASAC). The controller is optimized using laboratory experiments and numerical tools to simulate the performance a complete vehicle control set-up. Road tests yield a 6.9 dB noise reduction in the frequency range 75–105 Hz at the error microphone and 6.1 dB noise reduction at the passenger’s ear.

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