Journal
SENSORS
Volume 14, Issue 2, Pages 3428-3444Publisher
MDPI AG
DOI: 10.3390/s140203428
Keywords
extended parity space approach; fault detection and isolation; inertial sensor; redundant IMU; wavelet transform
Funding
- Ministry of Education, Science and Technology of the Republic of Korea under the NSL(National Space Lab) [S10801000163-08A0100-16310]
- Ministry of Science, ICT & Future Planning of the Republic of Korea under Space Core Technology Development Program [0418-20130027]
- National Research Foundation of Korea [2008-2003278, 2013M1A3A3A02042468] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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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).
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