A Model-Based Approach to Prognostics and Health01368172

A Model-Based Approach to Prognostics and Health01368172 -...

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2004 IEEE Aerospace Conference Proceedings A Model-Based Approach to Prognostics and Health Management for Flight Control Actuators Carl S. Byington, P.E. Matthew Watson Doug Edwards Impact Technologies, LLC 220 Regent Court State College, PA 16801 8 14-86 1-6273 [email protected] Abstract - Impact Technologies has developed a robust modeling paradigm for actuator fault detection and failure prediction. This model-based approach to prognostics and health management (PHM) applies physical modeling and advanced parametric identification techniques, along with fault detection and failure prediction algorithms, in order to predict the time-to-failure for each of the critical, competitive failure modes within the system. Advanced probabilistic fusion strategies are also leveraged to combine both collaborative and competitive sources of evidence, thus producing more reliable health state information. ntese algorithms operate only on /light control commandresponse data. This approach for condition-based maintenance provides reliable early detection of developing faults. As an advantage over ‘black-box’ health-monitoring schemes, faults and failure modes are traced back to physically meaningful system parameters, providing the maintainer with invaluable diagnostic and prognostic information. The developed model-based reasoner was validated and demonstrated on an electromechanical actuator (EMA) provided by Moog, Inc. j TABLE OF CONTENTS Table of Contents 1. Introduction 2. DiagnosticlPrognostic Approach 3. Actuator Failure Mode Evaluation 4. System Model and Parameters 5. Parametric Estimation 6. Classification and Prognostics 7. Advanced Fusion Strategies 8. Algorithm Validation and Demonstration of Results 9. Future Work 10. Acknowledgments 11. Summary 12. Biographies 13. References Paul Stoelting Moog Inc. Aircraft Group East Aurora, NY 14052-0018 716.687.5902 www.moog.com 1. INTRODUCTION Actuators provide a means for the conversion of mechanical, electrical, hydraulic, or pneumatic power into mechanical power. In aircraft, actuators are commonly utilized for driving various aircraft subsystems, including flight control surfaces and numerous utility systems. Flight control systems are obviously flight critical and, although highly redundant, must meet reliability requirements of less than one catastrophic failure per lx105 flight hours for the F/A 18 strike fighter [l] and 18x106 for F-35AB. Traditionally, the reliability of critical components such as actuators was estimated statistically and a conservative safe life removal interval (time or usage) for operational units was specified. Historical evidence, however, has indicated that the actual usage of military aircraft systems often differs greatly fiom the intended usage and the operating environment. Usage will also depend on the pilot and flying style in manned systems. Furthermore, unanticipated and extreme operating scenarios are a major cause of unscheduled maintenance events. These unanticipated in- field failures result in serious operational issues (safety, mission completion, and cost). Thus, the unfortunate reality
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This note was uploaded on 05/08/2011 for the course MECHANICAL 203 taught by Professor Krishna during the Spring '11 term at Akademia Ekonomiczna w Poznaniu.

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A Model-Based Approach to Prognostics and Health01368172 -...

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