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Sensors 2014, 14(2), 3428-3444; doi:10.3390/s140203428

Double Fault Detection of Cone-Shaped Redundant IMUs Using Wavelet Transformation and EPSA

1
Department of Mechanical and Aerospace Engineering, ASRI, Seoul National University, Seoul 151-741, Korea
2
Department of Mechanical and Aerospace Engineering, Institute of Advanced Aerospace Technology, Seoul National University, Seoul 151-741, Korea
*
Author to whom correspondence should be addressed.
Received: 21 November 2013 / Revised: 16 February 2014 / Accepted: 17 February 2014 / Published: 19 February 2014
(This article belongs to the Section Physical Sensors)
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Abstract

A model-free hybrid fault diagnosis technique is proposed to improve the performance of single and double fault detection and isolation. This is a model-free hybrid method which combines the extended parity space approach (EPSA) with a multi-resolution signal decomposition by using a discrete wavelet transform (DWT). Conventional EPSA can detect and isolate single and double faults. The performance of fault detection and isolation is influenced by the relative size of noise and fault. In this paper; the DWT helps to cancel the high frequency sensor noise. The proposed technique can improve low fault detection and isolation probability by utilizing the EPSA with DWT. To verify the effectiveness of the proposed fault detection method Monte Carlo numerical simulations are performed for a redundant inertial measurement unit (RIMU). View Full-Text
Keywords: extended parity space approach; fault detection and isolation; inertial sensor; redundant IMU; wavelet transform extended parity space approach; fault detection and isolation; inertial sensor; redundant IMU; wavelet transform
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Lee, W.; Park, C.G. Double Fault Detection of Cone-Shaped Redundant IMUs Using Wavelet Transformation and EPSA. Sensors 2014, 14, 3428-3444.

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