Browse > Article

Noise Attenuation Effect According to the Direction of Canceling Speaker in Duct-acoustic System  

Lee, Hyung-Seok (Department of Automotive, Juseong College)
Lee, Eung-Suk (Department of Mechanical Engineering, Chungbuk Univ.)
Publication Information
Abstract
In this paper, we studied on an attenuation effect of automobile exhaust noise according to the direction of canceling speaker in duct-acoustic ANC system. Automobile exhaust noise was recorded at 800rpm, 3500rpm and 5000rpm of a diesel engine. Directions of canceling speaker can be set to $30^{\circ}$, $90^{\circ}$ and $150^{\circ}$ against the primary noise flow by acrylic ducts to be made for the experimentation. DSP board used to control the ANC system. The algorithm of this ANC system applied the Filtered-x-LMS algorithm that is modified to compensate for a property of DSP input signal and the secondary-path effect. As an experiment result, the direction of canceling speaker was proved to influence the reduction effect of noise. The $150^{\circ}$ duct in the attenuation effect of noise showed a better result than the $90^{\circ}$ or $30^{\circ}$ duct.
Keywords
ANC; DSP; Reference Input Signal; Secondary Source; FXLMS Algorithm;
Citations & Related Records
연도 인용수 순위
  • Reference
1 Woo, J. H., Kim, I. S., Ih, J. G. and Kim, K. J.,"Active noise control of the plane wave travelling ina duct using FxLMS algorithm," Trans. of KASE, Vol.2, No. 2, pp. 107-116, 1992
2 Kim, H. S., Shin, J. and Oh, J. E., "Development of Active Noise Control System using DSP," J. of KSPE,Vol. 11, No. 1, pp. 108-113, 1994   과학기술학회마을
3 Kwon, O. C., Lee, G. T., Lee, H. J., Yang, I. H., Lee, J.Y. and Oh, J. E., "Active noise control for harmonic sound in a duct system," Proceedings of the KSPE Spring Conference, pp. 35-36, 2007
4 Lee, G. T., "A study on the active noise control of the duct system using Co-FxLMS algorithm," A Master'sThesis of Mechanical engineering, Hanyang University, pp. 1-96, 2007
5 Kuo, S. M. and Morgan, D. R., "Active noise controlsystem: Algorithm & DSP Implementation," John Wiley & Sons, pp. 1-328, 1996