Definition of parametric methods for fault analysis applied to an electromechanical servomechanism affected by multiple failures



Published Jul 8, 2014
Paolo Maggiore Matteo D. L. Dalla Vedova Lorenzo Pace Alessio Desando


In order to detect incipient failures due to a progressive wear of a primary flight command electromechanical actuator, prognostics could employ several approaches; the choice of the best ones is driven by the efficacy shown in failure detection, 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 above mentioned electromechanical actuator (EMA) failure and its degradation pattern is thus beneficial for anticipating the incoming failure and alerting the maintenance crew such to properly schedule the servomechanism replacement. The research presented in the paper was focused to develop a prognostic technique, able to identify symptoms alerting that an EMA component is degrading and will eventually exhibit an anomalous behavior; in particular four kinds of failure are considered: friction, backlash, coil short circuit, rotor static eccentricity. To this purpose, an innovative model based fault detection technique has been developed
merging together several information achieved by means of FFT analysis and proper "failure precursors" (calculated by comparing the actual EMA responses with the expected ones). To assess the robustness of the proposed technique, an appropriate simulation test environment was developed. The results showed an adequate robustness and confidence was gained in the ability to early identify an eventual EMA malfunctioning with low risk of false alarms or missed failures.

How to Cite

Maggiore, P., Vedova, M. D. L. D., Pace, L., & Desando, A. (2014). Definition of parametric methods for fault analysis applied to an electromechanical servomechanism affected by multiple failures. PHM Society European Conference, 2(1).
Abstract 350 | PDF Downloads 93



EMA, FFT, aircraft system, primary flight command

Çunkas, M., & Aydogdu, O. (2010). Realization of Fuzzy Logic Controlled Brushless DC Motor Drives using Matlab/Simulink. Mathematical and Computational Applications, vol. 15, n. 02, pp. 218-229.
Halvaei Niasar, A., Moghbelli, H., & Vahedi, A. (2009). Modelling, Simulation and Implementation of Four- Switch Brushless DC Motor Drive Based On Switching Functions. IEEE EUROCON 2009. May 18-23, St.- Petersburg (Russia), pp. 682 – 687.
Borello, L., Maggiore, P., Dalla Vedova, M. D. L., Alimhillaj, P. (2009). Dry Fiction acting on Hydraulic Motors and Control Valves: Dynamic Behavior of Flight Controls. XX National Congress AIDAA. Milan (Italy)
Borello, L., Maggiore, P., Villero, G., & Dalla Vedova, M. D. L. (2010). A comparison between Dry Friction Discontinuous Computational Algorithms. 27th International Congress of the Aeronautical Sciences ICAS 2010. September 19-24, Nice (France).
Borello, L., & Dalla Vedova, M. D. L. (2012). A Dry Friction Model and Robust Computational Algorithm for Reversible or Irreversible Motion Transmission. International Journal of Mechanics and Control (JoMaC), vol. 13, n. 02, pp. 37-48, ISSN: 1590-8844.
Borello, L., Dalla Vedova, M. D. L., Jacazio, G., & Sorli, M. (2009). A Prognostic Model for Electrohydraulic Servovalves. Proceedings of the Annual Conference of the Prognostics and Health Management Society. September 27-October 1, San Diego (USA).
Dalla Vedova, M. D. L., Jacazio, G., Maggiore, P., & Sorli, M. (2010). Identification of Precursors of Servovalves Failures for Implementation of an Effective Prognostics. International Conference of Recent Advances in Aerospace Actuation Systems and Components. May 5-7, Toulouse (France), pp.116-126.
Borello, L., & Dalla Vedova, M. D. L. (2006). Mechanical failures of flap control systems and related position errors: proposal of innovative configuration equipped with centrifugal brakes. International Journal of Mechanics and Control (JoMaC), vol. 07, n. 02, pp. 7-20, ISSN: 1590-8844.
Welch, P. D. (1967). The Use of Fast Fourier Transform for the Estimation of Power Spectra: A Method Based on Time Averaging Over Short, Modified Periodograms. IEEE Transactions on audio and electroacoustics, vol. AU-15, n. 2.
Cardona, A., Lerusse, A., & Géradin, M. (1998). Fast Fourier nonlinear vibration analysis. Computational Mechanics, vol. 22, n. 02, pp. 128-142.
Lee, B. K., Ehsani, M. (2003). Advanced Simulation Model for Brushless DC Motor Drives. Electric Power Components and Systems, vol. 31, n. 9, pp. 841–868, ISSN: 1532-5008.
Hemanand, T., Rajesh, T. (2006). Speed Control of Brushless DC Motor Drive Employing Hard Chopping PWM Technique Using DSP. Proceedings of India International Conference on Power Electronics (IICPE 2006). December 19-21, Chennai (India), pp. 393-396.
Haskew,T. A., Schinstock, D. E., & Waldrep E. M. (1999). “Two-Phase On” Drive Operation in a Permanent Magnet Synchronous Machine Electromechanical Actuator. IEEE Transactions on on Energy Conversion, vol. 14, v. 02.
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