scholarly journals Position and strength optimization for secondary source of transformer active noise control system

2015 ◽  
Author(s):  
Guodong Wang ◽  
Liming Ying ◽  
Yang Liu ◽  
Yong Chang ◽  
Jinwei Wang ◽  
...  
Keyword(s):  
Control System ◽  
Noise Control ◽  
Active Noise Control ◽  
Secondary Source ◽  
Active Noise

Effect of a tilting reflective plane on the performance of an active noise control system

2021 ◽  
pp. 107754632110317
Author(s):  
Sajaad Boodoo ◽  
Mohammad R Paurobally ◽  
Yasdeo Bissessur
Keyword(s):  
Control System ◽  
Noise Reduction ◽  
Noise Control ◽  
Single Channel ◽  
Active Noise Control ◽  
Real Life ◽  
Orientation Angle ◽  
Secondary Source ◽  
Living Room ◽  
Active Noise

This article presents the results of an investigation of the noise reduction performance of a single-channel active noise control system in the presence of a tilting reflective plane. It is shown that the noise reduction achieved by the system depends upon the orientation angle of the panel and on the separation distances between both the primary and the secondary source and the reflective panel. It is also observed that the maximum noise reduction is obtained when the reflective panel is vertical and when the separation distance is less than about 0.13 of the wavelength at the frequency of interest. When the panel is moved away, the maximum noise reduction occurs at other tilting angles. Experiments were carried out in a real living room which is close to real-life situations. It is found that there is an improvement in the extent of the quiet zone in the presence of the panel. The reduction in sound pressure level is also better with the reflective panel, which is up to 20 dB.

Secondary Source Modeling Based on Analogue Circuits of Electrical Mechanical and Acoustical Systems

2011 ◽  
Vol 328-330 ◽  
pp. 2265-2269
Author(s):  
Yong Hong Nie ◽  
Jun Sheng Cheng
Keyword(s):  
Control System ◽  
Transfer Function ◽  
Noise Reduction ◽  
Noise Control ◽  
Active Noise Control ◽  
Secondary Source ◽  
Source Modeling ◽  
Ideal Model ◽  
Active Noise ◽  
Analogue Circuits

A method of secondary source modeling based on analogue circuits of electrical, mechanical and acoustical systems (SSM-ACEMAS) was provided in order to reduce the mismatch of transfer function estimation of secondary path in the simulation of active noise control (ANC) system. The convergence range and noise reduction performance of the system with SSM-ACEMAS and Filtered-X LMS algorithm were investigated. The results show that the transfer function of such a secondary source model has different amplitude and phase from the ideal model, which makes the noise reduction performance of an ANC system be much worse than the one with ideal model. Meantime, the convergence range of the control system is increased at low frequencies while decreased at high frequencies. The proposed model can provide a new method of secondary source modeling for further research on the simulation of active noise control system.

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