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Research on Accelerated Reliability Testing Methods Applicable to Nonelectronic Components of Flight Control Systems.

AD617567

Publication Date	1965
Personal Author	Johnson, W. F.
Page Count	2
Abstract	The study is concerned with the development of techniques for the testing of electromechanical components in time compressed form. The motivating basis for this work is that presently used statistical testing methods require large numbers of samples and long testing periods to compile meaningful MTBF data. The approach employed herein included: System failure mode analysis, Classification and ranking of failure modes in terms of influence and frequency of occurrence, Physics of failure analysis at part and material levels. 'Measured weakening' (pre-cracking) technique was developed and applied to the most predominate failure parts to generate failures in reasonably short test times. In addition, extraneous or unwanted failures were not produced, which is frequently the case when 'over load' testing is employed. An all mechanical position servo unit was selected as a typical energy conversion flight control system component on which tests were conducted to verify the developed techniques for accelerating reliability testing. The tests results indicated that 'measured weakening' of mechanical parts can be employed to reduce the number of samples required and the test time involved to perform reliability testing. (Author)
Keywords	Test methods Flight control systems Failure(Mechanics) Reliability Servomechanisms Life expectancy Data processing systems Malfunctions Costs Effectiveness Systems engineerings
Corporate Authors	Curtiss Div Curtiss-Wright Corp Caldwell N J
Supplemental Notes	Available copy will not permit fully legible reproduction. Reproduction will be made if requested by users of DDC. Copy is available for public sale.
Document Type	Technical Report
Title Note	Final technical rept. for 1 May 63-1 May 64.
NTIS Issue Number	196516
Contract Number	AF33 657 11080

Research on Accelerated Reliability Testing Methods Applicable to Nonelectronic Components of Flight Control Systems.

Research on Accelerated Reliability Testing Methods Applicable to Nonelectronic Components of Flight Control Systems.
AD617567

Publication Date	1965
Personal Author	Johnson, W. F.
Page Count	2
Abstract	The study is concerned with the development of techniques for the testing of electromechanical components in time compressed form. The motivating basis for this work is that presently used statistical testing methods require large numbers of samples and long testing periods to compile meaningful MTBF data. The approach employed herein included: System failure mode analysis, Classification and ranking of failure modes in terms of influence and frequency of occurrence, Physics of failure analysis at part and material levels. 'Measured weakening' (pre-cracking) technique was developed and applied to the most predominate failure parts to generate failures in reasonably short test times. In addition, extraneous or unwanted failures were not produced, which is frequently the case when 'over load' testing is employed. An all mechanical position servo unit was selected as a typical energy conversion flight control system component on which tests were conducted to verify the developed techniques for accelerating reliability testing. The tests results indicated that 'measured weakening' of mechanical parts can be employed to reduce the number of samples required and the test time involved to perform reliability testing. (Author)
Keywords	Test methods Flight control systems Failure(Mechanics) Reliability Servomechanisms Life expectancy Data processing systems Malfunctions Costs Effectiveness Systems engineerings
Corporate Authors	Curtiss Div Curtiss-Wright Corp Caldwell N J
Supplemental Notes	Available copy will not permit fully legible reproduction. Reproduction will be made if requested by users of DDC. Copy is available for public sale.
Document Type	Technical Report
Title Note	Final technical rept. for 1 May 63-1 May 64.
NTIS Issue Number	196516
Contract Number	AF33 657 11080