Analysis and DSP Implementation of a Broadband Duct ANC System Using Spatially Feedforward Structure

[+] Author and Article Information
Mingsian R. Bai, 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

J. Vib. Acoust 123(2), 129-136 (Oct 01, 2000) (8 pages) doi:10.1115/1.1355031 History: Received July 01, 1999; Revised October 01, 2000
Copyright © 2001 by ASME
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Spatially feedforward structure (a) schematic of the duct ANC system (b) equivalent circuit
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Electro-mechanical analysis of a moving coil speaker (a) equivalent circuit with an ideal transformer (b) circuit reflected to the mechanical side
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The implementable controller involving only electrical voltages
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Equivalent formulations of ideal controller (a) zero spillover controller (b) Roure’s controller
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Roure’s controller (a) frequency response function (b) impulse response function
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Second order filters of hybrid implementation —: Roure’s controller - -: second order filters
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Frequency response functions of CIIR(jω) and CFIR(jω); - -: CFIR(jω); —: CIIR(jω)
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Impulse response functions of hybrid implementation (a) CFIR(jω), (b) CIIR(jω) (c) C(jω)
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Frequency response functions of hybrid implementation (a) magnitude of FIR part (b) magnitude of the IIR part (c) magnitude of the cascaded controller (d) phase of cascaded controller —: hybrid implementation of Roure’s controller; - -: method of electro-mechanical constants of ideal controller
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The experimental arrangement
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Experimental results of active attenuation (a) FIR implementation (b) IIR implementation (c) hybrid implementation using bandpass filter (d) hybrid implementation using Wiener filter —: control off, - -: control on
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Experimental results of active attenuation (a) open end (b) closed end —: control off - -: control on



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