Noise suppression system

1989 ◽  
Vol 86 (5) ◽  
pp. 2052-2052
Author(s):  
Richard J. Vilmur
Keyword(s):  
Noise Suppression ◽  
Suppression System

A noise suppression system for FM radio receiver

1993 ◽  
Vol 39 (3) ◽  
pp. 533-539 ◽  
Author(s):  
A. Nohara ◽  
J. Kane
Keyword(s):  
Noise Suppression ◽  
Radio Receiver ◽  
Fm Radio ◽  
Suppression System

А practical approach to the development of aircraft GTE’s noise suppression system on the base of fiber optic sensors

2017 ◽  
Author(s):  
Vasiliy Yu. Vinogradov ◽  
Oleg G. Morozov ◽  
Gennady A. Morozov ◽  
Airat Zh. Sakhabutdinov ◽  
Ilnur I. Nureev ◽  
...  
Keyword(s):  
Noise Suppression ◽  
Fiber Optic ◽  
Fiber Optic Sensors ◽  
Practical Approach ◽  
Suppression System

Active system for reduction of noise parameters of car muffler with the use of pressure sensors based on silicon microcrystals

2021 ◽  
Vol 1 (109) ◽  
pp. 35-41
Author(s):  
R.V. Zinko ◽  
A.P. Kutrakov ◽  
S.V. Shybanov ◽  
N.M. Zashchepkina ◽  
O.M. Markina
Keyword(s):  
Noise Suppression ◽  
Combustion Engine ◽  
Low Frequency ◽  
Helmholtz Resonator ◽  
Temperature Sensors ◽  
Exhaust Gas ◽  
Variable Volume ◽  
Active Noise ◽  
Buffer Tank ◽  
Suppression System

Purpose: The article contains the results of research and development of a system for active noise damping of an automobile engine. The proposed system of active noise suppression can significantly reduce the sound pressure level in the frequency band up to 500 Hz. The robotic principle of the developed system is based on the addition of an additional buffer tank with a variable volume in the silencer system. The use of high-temperature sensors with strain gauges based on silicon microcrystals to obtain information on the parameters of sound vibrations arising during the exhaust gas outflow made it possible to create a control system for changing the volume of the buffer tank. The results of testing the proposed system of active noise suppression of an internal combustion engine are presented. Design/methodology/approach: The active noise suppression system based on the Helmholtz resonator used tools to control general noise levels, experimental tests, complex mathematical modelling of acoustic processes in Solidworks, taking into account the conditions of propagation and attenuation of sound energy by intermediate closed volumes. Findings: The use of an additional resonator chamber with variable volume in the exhaust muffler of the internal combustion engine allowed to reduce the resonant phenomena in the zone of low-frequency pulsations of exhaust gas pressure from 57 Hz to 43 Hz at frequency drift in the range of 310… 350 Hz, which significantly improved its noise characteristics. Research limitations/implications: For further research, to improve the characteristics of the active noise suppression system, it is advisable to consider the use of several inadditional cameras of the Helmholtz resonator and to clarify the algorithm of the controller in transient modes of engine operation. Practical implications: The developed design of active noise reduction is simpler in comparison with analogs and allows reducing the noise of exhaust gases in a low-frequency range. Originality/value: To reduce the noise, a variable-volume Helmholtz resonator was used, the efficiency of which is provided by high-temperature sensors of the original design.

Comparison of 1.5 μm Ultra-Stable Laser Systems Based on Fiber Noise Suppression System

2017 ◽  
Vol 44 (4) ◽  
pp. 0404001
Author(s):  
王朝阳 Wang Zhaoyang ◽  
金尚忠 Jin Shangzhong ◽  
李烨 Li Ye ◽  
林弋戈 Lin Yige ◽  
方占军 Fang Zhanjun
Keyword(s):  
Noise Suppression ◽  
Laser Systems ◽  
Stable Laser ◽  
Suppression System
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