A Wavelet-Packet Approach for Analytical Redundancy in Frequency Subbands

Author(s)

Paiva, Henrique Mohallem ; Harrop Galvao, Roberto Kawakami ; IEEE

• Document type: Journal article
• Source: 2008 MEDITERRANEAN CONFERENCE ON CONTROL AUTOMATION, VOLS 1-4; v. N/A, p. 2-pg., 2008-01-01.

Abstract

This paper presents an analytical redundancy approach for fault detection in frequency subbands. The proposed method employs an optimized wavelet packet decomposition tree to band-limit the signals under consideration. Dynamic consistency checks can be carried out within each frequency subband by using models identified from training data. A fault detection example involving a simulated servomechanism is presented for illustration. The wavelet packet method is compared with a similar technique employing a standard wavelet decomposition tree, as well as with a classic fault-detection scheme based on a Luenberger state-observer. The results indicate that the proposed method has better sensitivity to the fault effect. (AU)

• FAPESP's process: 06/58850-6 - Diagnosis, prognosis and fault accommodation for dynamical systems
• Grantee: Takashi Yoneyama
• Support Opportunities: Research Projects - Thematic Grants