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A method for noninvasive on-line sec...

Kim, Benjamin Jung.

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A method for noninvasive on-line secondary path modeling for the filtered-X LMS algorithm for active control of periodic noise.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	A method for noninvasive on-line secondary path modeling for the filtered-X LMS algorithm for active control of periodic noise./
作者:	Kim, Benjamin Jung.
面頁冊數:	120 p.
附註:	Adviser: David C. Swanson.
Contained By:	Dissertation Abstracts International63-05B.
標題:	Engineering, Electronics and Electrical. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3051679
ISBN:	0493669817

A method for noninvasive on-line secondary path modeling for the filtered-X LMS algorithm for active control of periodic noise.
Kim, Benjamin Jung.

A method for noninvasive on-line secondary path modeling for the filtered-X LMS algorithm for active control of periodic noise. - 120 p.

Adviser: David C. Swanson.

Thesis (Ph.D.)--The Pennsylvania State University, 2002.

A novel method for noninvasive on-line secondary path modeling for the filtered-X LMS algorithm is proposed for the active control of periodic noise. Previous noninvasive algorithms have utilized iterative search methods that have proven unsuccessful in delivering sufficiently accurate secondary path models for use by the filtered-X LMS-based control system, especially in time-varying systems, resulting in poor performance and instability. The proposed method, based in the frequency domain, uses the concept of linear independence of two equations/two unknowns to arrive at the secondary path estimate. Linear independence of the two equations is achieved by adjusting the control filter output via the filter coefficients prior to the acquisition of the second set of data corresponding to the second equation.

ISBN: 0493669817Subjects--Topical Terms:

626636
Engineering, Electronics and Electrical.

A method for noninvasive on-line secondary path modeling for the filtered-X LMS algorithm for active control of periodic noise.
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245 1 0 $a A method for noninvasive on-line secondary path modeling for the filtered-X LMS algorithm for active control of periodic noise.
300 $a 120 p.
500 $a Adviser: David C. Swanson.
500 $a Source: Dissertation Abstracts International, Volume: 63-05, Section: B, page: 2422.
502 $a Thesis (Ph.D.)--The Pennsylvania State University, 2002.
520 $a A novel method for noninvasive on-line secondary path modeling for the filtered-X LMS algorithm is proposed for the active control of periodic noise. Previous noninvasive algorithms have utilized iterative search methods that have proven unsuccessful in delivering sufficiently accurate secondary path models for use by the filtered-X LMS-based control system, especially in time-varying systems, resulting in poor performance and instability. The proposed method, based in the frequency domain, uses the concept of linear independence of two equations/two unknowns to arrive at the secondary path estimate. Linear independence of the two equations is achieved by adjusting the control filter output via the filter coefficients prior to the acquisition of the second set of data corresponding to the second equation.
520 $a The proposed method is tested on a unique “sound-free” system designed and built specifically for the validation of active noise control algorithms. A summing junction circuit simulates the interference between the primary and secondary disturbances while a computer housing a manually adjustable filter provides a time-varying secondary path; signal generators provide the reference signal. Sinusoidal and dual-frequency signals are used to validate the proposed method. In order to demonstrate the ability of the proposed secondary path modeler to track system changes, tests are conducted where the frequencies are shifted and also where the secondary path is evolving. The secondary path estimates are then compared to the correct estimates ascertained using an LMS-based adaptive filter. The results reflect a simple and elegant secondary path modeling algorithm that provides estimates of unprecedented accuracy for time-varying systems. This accuracy in turn allows for stable operation of the filtered-X LMS-based control filter and thus reliable noise cancellation performance.
590 $a School code: 0176.
650 4 $a Engineering, Electronics and Electrical. $3 626636
650 4 $a Physics, Acoustics. $3 1019086
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