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Considerations for Application of SOBI to Order Tracking

Author(s): Scot I. McNeill

Journal: Journal of Signal and Information Processing
ISSN 2159-4465

Volume: 02;
Issue: 01;
Start page: 33;
Date: 2011;
Original page

Keywords: Blind Source Separation (BSS) | Order Tracking | Second Order Blind Identification (SOBI) | Synchronous Resampling | Vold-Kalman Filter | Gabor Filter

Current methods of order tracking, such as synchronous resampling, Gabor filtering, and Vold-Kalman filtering have undesirable traits. Each method has two or more of the following deficiencies: requires measurement or estimate of rotational speed over time, failure to isolate the contribution of crossing orders in the vicinity of the crossing time, large computational expense, end effects. In this work a new approach to the order tracking problem is taken. The Second Order Blind Identification (SOBI) algorithm is applied to synthesized data. The technique is shown to be very successful at isolating crossing orders and circumvents all of the above deficiencies. The method has its own restric-tions: multiple sensors are required and sensors must be mounted on a structure that responds quasi-statically to exci-tation of the rotational system.
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