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The meaning of quantified maintainability
19S
ABSTRACTS ON M I C R O E L E C T R O N [ C S AND R E L I A B I L I T Y
component parr fields bv various manufacturers. Discusses the question of methods for promoting the use and preservation of this vast industrial investment of time and mor:ev.
Operational pp. 859-879. .Ministry but a provisional
reliability of militar T apparatus. J. FAFEUR, L'Onde Electriwe, September (1963), The author examines military telecommunications apparatus commissioned by the Air excludes from the account the basic principles of operation. This first parz is followed bv reliability assessment. (French)
Reliability of electronic equipment--trials of classification according to the needs of users. J. ELDIN, L'O,tde Electrique, September (1963), pp. 829-834. The author classifies electronic equipment into several main reliability categories in accordance with the stresses and strains to which these apparatus are subjected in use, and also according to climatic and other working conditions. The importance of preventive maintenance in reducing the number of complex faults is emphasized. The relation between the author's classification and the reliability of individual compmlents is discussed. It is concluded that apart from the r
MAINTENANCE A certain problem related to reliability of electronic apparatus. A. PLUCI.','SK?~,Arckiwum Elektrotechniki XII, 2 (1963), p. 342. Composite electronic apparatus contains, among other components, n interchangeable elements (resp. interchangeable self-contained sets of elements) of certain type. Thc problem under consideration consists in determining the number, no, of spare elements (resp. sets of elements) in a manner enablirlg to state, that with an assumed probability, p, never occurs lack of interchangeable elements. Two principal cases are distinguished: A--interchangeable spare parts are repaired; B--interchangeable spare parts are not repaired. Considerations in the case A can be related to arbitrary probability distributions of the period of correct performance. In the case B k is assumed that the period of correct performance has exponential distribution and the repair time has an optional distribution (but of a finite average value).
The m e a n i n g of quantified maintainability.* N. M:XROULIS,IEEE Trans. Reliability R-12, 2 (1963), pp. 39-48. Many and varying definitions of maintainability have been proposed and many mathematical approaches to maintainability and its various aspects have been pursued, but there is at present no general agreement on the de~mition of maintainability or on the technique of its quantification. There is a need for improvement in both the design of the total maintenance system as well as analytical techniques for its evaluation. M a i n t e n a n c e of electronic apparatus and reliability. C. Gt;YOT, L'Onde Electrique, September (1963), pp. 851-858. In a previous article a few general principles applied by C.E.A. to the maintenance and repair of their electronic apparatus were given. Here the author studies the relationship existing between maintenance and reliability, and emphasizes the importance played by maintenance in improving the survival probability of apparatus within a rational organization. He aIso examines the main factors contributing to increased reliability of electronic apparatus. Experimental results complementary to (1) are given. They deal with failure rates of essential components, and cover the range from 27,000-50 million component-hours. A comparison is made, showing agreement between experimental results and calculations of reliability. (French)
ABSTRACTS ON M I C R O E L E C T R O N [ C S AND R E L I A B I L I T Y
component parr fields bv various manufacturers. Discusses the question of methods for promoting the use and preservation of this vast industrial investment of time and mor:ev.
Operational pp. 859-879. .Ministry but a provisional
reliability of militar T apparatus. J. FAFEUR, L'Onde Electriwe, September (1963), The author examines military telecommunications apparatus commissioned by the Air excludes from the account the basic principles of operation. This first parz is followed bv reliability assessment. (French)
Reliability of electronic equipment--trials of classification according to the needs of users. J. ELDIN, L'O,tde Electrique, September (1963), pp. 829-834. The author classifies electronic equipment into several main reliability categories in accordance with the stresses and strains to which these apparatus are subjected in use, and also according to climatic and other working conditions. The importance of preventive maintenance in reducing the number of complex faults is emphasized. The relation between the author's classification and the reliability of individual compmlents is discussed. It is concluded that apart from the r
MAINTENANCE A certain problem related to reliability of electronic apparatus. A. PLUCI.','SK?~,Arckiwum Elektrotechniki XII, 2 (1963), p. 342. Composite electronic apparatus contains, among other components, n interchangeable elements (resp. interchangeable self-contained sets of elements) of certain type. Thc problem under consideration consists in determining the number, no, of spare elements (resp. sets of elements) in a manner enablirlg to state, that with an assumed probability, p, never occurs lack of interchangeable elements. Two principal cases are distinguished: A--interchangeable spare parts are repaired; B--interchangeable spare parts are not repaired. Considerations in the case A can be related to arbitrary probability distributions of the period of correct performance. In the case B k is assumed that the period of correct performance has exponential distribution and the repair time has an optional distribution (but of a finite average value).
The m e a n i n g of quantified maintainability.* N. M:XROULIS,IEEE Trans. Reliability R-12, 2 (1963), pp. 39-48. Many and varying definitions of maintainability have been proposed and many mathematical approaches to maintainability and its various aspects have been pursued, but there is at present no general agreement on the de~mition of maintainability or on the technique of its quantification. There is a need for improvement in both the design of the total maintenance system as well as analytical techniques for its evaluation. M a i n t e n a n c e of electronic apparatus and reliability. C. Gt;YOT, L'Onde Electrique, September (1963), pp. 851-858. In a previous article a few general principles applied by C.E.A. to the maintenance and repair of their electronic apparatus were given. Here the author studies the relationship existing between maintenance and reliability, and emphasizes the importance played by maintenance in improving the survival probability of apparatus within a rational organization. He aIso examines the main factors contributing to increased reliability of electronic apparatus. Experimental results complementary to (1) are given. They deal with failure rates of essential components, and cover the range from 27,000-50 million component-hours. A comparison is made, showing agreement between experimental results and calculations of reliability. (French)