Active noise control for attenuation of low‐frequency broadband jet engine exhaust noise

1994 ◽  
Vol 96 (5) ◽  
pp. 3332-3332
Author(s):  
Jerome P. Smith ◽  
Ricardo A. Burdisso ◽  
Chris R. Fuller ◽  
Rob Gibson
Keyword(s):  
Noise Control ◽  
Active Noise Control ◽  
Low Frequency ◽  
Engine Exhaust ◽  
Jet Engine ◽  
Active Noise ◽  
Exhaust Noise

Development of Engine Exhaust Active Noise Control System

2014 ◽  
Vol 986-987 ◽  
pp. 1196-1200
Author(s):  
Jie Wang ◽  
Zhi En Liu ◽  
Jia Wei Zeng ◽  
Chao Wang
Keyword(s):  
Control System ◽  
Noise Control ◽  
Active Noise Control ◽  
Low Frequency ◽  
Signal Acquisition ◽  
Frequency Noise ◽  
Low Frequency Noise ◽  
Engine Exhaust ◽  
Voice Signal ◽  
Active Noise

In order to enhance the capacity of elimination of engine exhaust low frequency noise, a set of engine exhaust active noise control system was developed. The system was developed by using MC9S12XS128 MCU, and it is based on the theory of sound wave interference. The system can realize the voice signal acquisition, reverse phase processing and output, and can eliminate engine exhaust low frequency noise. Experimental results showed that the system has good silencing effects on the engine exhaust noise under the steady state.

scholarly journals Experience With Active Control of Exhaust Noise From a Large Frame Combustion Turbine

1997 ◽  
Author(s):  
Lisa A. Beeson ◽  
George A. Schott
Keyword(s):  
Control System ◽  
Noise Control ◽  
Active Noise Control ◽  
Low Frequency ◽  
Heat Rate ◽  
Frequency Noise ◽  
Low Frequency Noise ◽  
Residential Areas ◽  
Active Noise ◽  
Exhaust Noise

Low frequency noise generated by combustion turbine exhaust is one of the most difficult environmental impacts to control. When a combustion turbine power plant is located near residential areas or other sensitive receptors, it is imperative to minimize the low frequency noise being emitted. In the past, available technology was limited to passive and reactive silencers and massive enclosures or barrier walls. These techniques are expensive and can have significant impacts on megawatt output and heat rate. Active noise control technology offers an alternative for applications near sensitive receptors. An active noise control system was installed on the exhaust stack of a combustion turbine with an objective to cancel exhaust noise at frequencies below 35 Hertz (Hz). Unlike passive and reactive low frequency silencing, the active noise control system does not impact combustion turbine performance. The technology can be applied to new apparatus and can be retrofit to existing facilities with minimal changes to the design.

Inversion-Based Feedforward Approach to Broadband Acoustic Noise Reduction

2008 ◽  
Vol 130 (5) ◽  
Author(s):  
Tom C. Waite ◽  
Qingze Zou ◽  
Atul Kelkar
Keyword(s):  
Noise Control ◽  
Feedforward Control ◽  
Acoustic Noise ◽  
Active Noise Control ◽  
Low Frequency ◽  
Control Technique ◽  
Frequency Range ◽  
Nonminimum Phase ◽  
Control Approach ◽  
Active Noise

In this article, an inversion-based feedforward control approach to achieve broadband active-noise control is investigated. Broadband active-noise control is needed in many areas, from heating, ventilation and air conditioning (HVAC) ducts to aircraft cabins. Achieving broadband active-noise control, however, is very challenging due to issues such as the complexity of acoustic dynamics (which has no natural roll-off at high frequency, and is often nonminimum phase), the wide frequency spectrum of the acoustic noise, and the critical requirement to overcome the delay of the control input relative to the noise signal. These issues have limited the success of existing feedforward control techniques to the low-frequency range of [0,1]kHz. The modeling issues in capturing the complex acoustic dynamics coupled with its nonminimum-phase characteristic also prevent the use of high-gain feedback methods, making the design of an effective controller to combat broadband noises challenging. In this article, we explore, through experiments, the potential of inversion-based feedforward control approach for noise control over the 1kHz low-frequency range limit. Then we account for the effect of modeling errors on the feedforward input by a recently developed inversion-based iterative control technique. Experimental results presented show that noise reduction of over 10–15dB can be achieved in a broad frequency range of 5kHz by using the inversion-based feedforward control technique.

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