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Active Noise Control Using Modally Tuned Phase-Compensated Filters

Bisnette, Jesse Bennett (2004) Active Noise Control Using Modally Tuned Phase-Compensated Filters. Master's Thesis, University of Pittsburgh. (Unpublished)

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An active noise control device or an active noise absorber (ANA) that is based on either resonant 2nd - order or 4th - order Butterworth filters is developed and demonstrated. This control method is similar to structural positive position feedback (PPF) control, with two exceptions: 1) acoustic transducers (microphone and speaker) can not be truly colocated, and 2) the acoustic actuator (loudspeaker) has significant dynamics that can affect performance and stability. Acoustic modal control approaches are typically not sought, however, there are a number of applications where controlling a few room modes is adequate. A model of a duct with speakers at each end is developed and used to demonstrate the control method, including the impact of the speaker dynamics. An all-pass filter is used to provide phase compensation and improve controller performance. Two companion experimental studies validated the simulation results. A single mode case using a resonant band-pass filter demonstrated nearly 10 dB of control in the first duct, while a multimodal case using two 4th - order Butterworth band-pass filters show both 10 dB of reduction in the fundamental mode and nearly 8.0 dB in the second.


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Item Type: University of Pittsburgh ETD
Status: Unpublished
CreatorsEmailPitt UsernameORCID
Bisnette, Jesse Bennettjbbst26@pitt.eduJBBST26
ETD Committee:
TitleMemberEmail AddressPitt UsernameORCID
Committee MemberBudny, Danial Dbudny@pitt.eduBUDNY
Committee MemberVipperman, Jeffery Sjsv@pitt.eduJSV
Committee MemberClark, William Wwclark@engr.pitt.eduWCLARK
Date: 2 February 2004
Date Type: Completion
Defense Date: 25 November 2003
Approval Date: 2 February 2004
Submission Date: 24 November 2003
Access Restriction: No restriction; Release the ETD for access worldwide immediately.
Institution: University of Pittsburgh
Schools and Programs: Swanson School of Engineering > Mechanical Engineering
Degree: MSME - Master of Science in Mechanical Engineering
Thesis Type: Master's Thesis
Refereed: Yes
Uncontrolled Keywords: Acoustics; Active Noise Control; Modal Control; Positive Position Feedback
Other ID:, etd-11242003-150407
Date Deposited: 10 Nov 2011 20:06
Last Modified: 15 Nov 2016 13:52


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