The active control technique for broadband attenuation of noise in ducts, using spatially feedforward structure, is investigated from the viewpoints of both acoustic analysis and control engineering. According to the previous work by Munjal and Eriksson [1], there exists an ideal controller for this problem. The ideal controller is a function of the finite source impedance and is thus independent of the boundary conditions. Despite the simplicity, the ideal controller cannot be practically implemented due to the difficulty of calibration of electro-mechanical parameters. To overcome the problem, the controller is implemented via an equivalent formulation modified from the controller originally proposed by Roure [2]. The modified controller is implemented on a DSP platform, using a FIR filter, an IIR filter and a hybrid filter. The experimental results showed that the system achieved 17.2 dB maximal attenuation in the frequency band 300∼600 Hz. Physical insights and design considerations in implementation phase are also discussed in the paper.
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April 2001
Technical Papers
Analysis and DSP Implementation of a Broadband Duct ANC System Using Spatially Feedforward Structure
Mingsian R. Bai,
Mingsian R. Bai
Department of Mechanical Engineering, National Chiao-Tung University, 1001 Ta-Hsueh Road, Hsin-Chu 300, Taiwan, Republic of China
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Yujeng Lin,
Yujeng Lin
Department of Mechanical Engineering, National Chiao-Tung University, 1001 Ta-Hsueh Road, Hsin-Chu 300, Taiwan, Republic of China
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Jian-Da Wu
Jian-Da Wu
Department of Vehicle Engineering & Technology, Da-Yeh University, 112 Shan-Jeau Road, Da-Tsuen, Chang-Hwa 515, Taiwan, Republic of China
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Mingsian R. Bai
Department of Mechanical Engineering, National Chiao-Tung University, 1001 Ta-Hsueh Road, Hsin-Chu 300, Taiwan, Republic of China
Yujeng Lin
Department of Mechanical Engineering, National Chiao-Tung University, 1001 Ta-Hsueh Road, Hsin-Chu 300, Taiwan, Republic of China
Jian-Da Wu
Department of Vehicle Engineering & Technology, Da-Yeh University, 112 Shan-Jeau Road, Da-Tsuen, Chang-Hwa 515, Taiwan, Republic of China
Contributed by the Technical Committee on Vibration and Sound for publication in the JOURNAL OF VIBRATION AND ACOUSTICS. Manuscript received July 1999; revised Oct. 2000. Associate Editor: R. L. Clark.
J. Vib. Acoust. Apr 2001, 123(2): 129-136 (8 pages)
Published Online: October 1, 2000
Article history
Received:
July 1, 1999
Revised:
October 1, 2000
Citation
Bai , M. R., Lin, Y., and Wu, J. (October 1, 2000). "Analysis and DSP Implementation of a Broadband Duct ANC System Using Spatially Feedforward Structure ." ASME. J. Vib. Acoust. April 2001; 123(2): 129–136. https://doi.org/10.1115/1.1355031
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