Evaluation of the correlation coefficient as a prognostic indicator for electromechanical servomechanism failures
| Autor: | Matteo Davide Lorenzo Dalla Vedova, Alessio Desando, Paolo Maggiore, Lorenzo Pace |
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| Předmět: |
Engineering
Correlation coefficient Fast Fourier transform Crew Energy Engineering and Power Technology failure maps Anomalous behavior Servomechanism Fault detection and isolation law.invention Systems engineering multiple failures TA168 law Stator coil Computer Science (miscellaneous) Safety Risk Reliability and Quality Civil and Structural Engineering servomechanism business.industry Mechanical Engineering Control engineering TA213-215 fault detection Reliability engineering Engineering machinery tools and implements ema business Backlash |
| Zdroj: | Scopus-Elsevier International Journal of Prognostics and Health Management, Vol 6, Iss 1 (2015) |
| Popis: | In order to identify incipient failures due to a progressive wear of a primary flight command electromechanical actuator, several approaches could be employed; the choice of the best ones is driven by the efficacy shown in fault detection/identification, since not all the algorithms might be useful for the proposed purpose. In other words, some of them could be suitable only for certain applications while they could not give useful results for others. Developing a fault detection algorithm able to identify the precursors of the abovementioned electromechanical actuator (EMA) failure and its degradation pattern is thus beneficial for anticipating the incoming malfunction and alerting the maintenance crew such to properly schedule the servomechanism replacement. The research presented in the paper was focused to develop a fault detection/identification technique, able to identify symptoms alerting that an EMA component is degrading and will eventually exhibit an anomalous behavior, and to evaluate its potential use as prognostic indicator for the considered progressive faults (i.e. frictions and mechanical backlash acting on transmission, stator coil short circuit, rotor static eccentricity). To this purpose, an innovative model based fault detection technique has been developed merging several information achieved by means of Fast Fourier Transform (FFT) analysis and proper "failure precursors" (calculated by comparing the actual EMA responses with the expected ones). To assess the performance of the proposed technique, an appropriate simulation test environment was developed: the results showed an adequaterobustness and confidence was gained in the ability to early identify an eventual EMA malfunctioning with low risk of false alarms or missed failures. |
| Databáze: | OpenAIRE |
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