Seeded Failure Testing and Analysis of an Electro-04161657

Seeded Failure Testing and Analysis of an Electro-04161657...

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1 Seeded Failure Testing and Analysis of an Electro- Mechanical Actuator David S. Bodden N. Scott Clements Bill Schley Gavin Jenney Lockheed Martin Aeronautics Lockheed Martin Aeronautics Parker Aerospace Dynamic Controls, Inc. 1 Lockheed Blvd 1 Lockheed Blvd 14300 Alton Parkway 7060 Cliffwood Place Fort Worth, TX 76108 Fort Worth, TX 76108 Irvine, CA 92618 Dayton, OH 45424 817-935-4700 817-655-7961 949-465-4285 937-254-2529 david.s.bodden@lmco.com scott.clements@lmco.com wschley@parker.com jenney@dci-ohio.com Abstract —An accelerated wear test program for an electromechanical actuator (EMA) was funded and conducted by Parker Aerospace and Lockheed Martin Aeronautics Company. Testing was performed at Dynamic Controls, Inc. The objective of the program was to identify failure pre-cursors that exhibited repeatable trends, and could be used to construct a remaining useful life algorithm with an identifiable confidence level. Selected mechanical components of the actuator were seeded with an abrasive contaminant to achieve accelerated wear. The desired goal was to achieve component wearout in approximately 24 hours, providing acceptable test times with pre-cursor signatures representative of normal wearout. The test facility and approach is described, along with failure criteria and test results. Although the scope of this effort was relatively limited, it revealed some potentially useful wear indicators, along with many areas of difficulty for which further effort is recommended. 1 2 3 TABLE OF CONTENTS 1. INTRODUCTION. ............................................................... 1 2. EMA DESCRIPTION AND RELIABILITY ANALYSIS. ........ 2 3. TEST PROGRAM. .............................................................. 3 4. DATA ANALYSIS . ............................................................. 5 5. CONCLUDING REMARKS. ................................................ 7 REFERENCES . ...................................................................... 8 BIOGRAPHIES . ..................................................................... 8 1. I NTRODUCTION The current implementation of prognosis algorithms in mechanical and/or electrical systems has primarily been focused on achieving life cycle cost reductions through condition based maintenance. In [1], the argument was made that since components are being replaced before they fail with condition based maintenance approaches, the system was achieving an effective reliability increase and this could be taken advantage of to reduce physical system redundancy in systems that were safety critical. The viability of this concept was dependant on being able to assign a confidence level to the ability of the prognosis system to detect failures at least one mission length in advance. 1
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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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Seeded Failure Testing and Analysis of an Electro-04161657...

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