DEPENDABILITY, №2(53)-2015

Structural reliability. The theory and practice

• V.A. Gapanovich, E.N. Rozenberg, I.B. Shubinsky, A.M. Zamyshlyaev.
  SYSTEM OF ADAPTIVE MANAGEMENT OF RAIL TRANSPORT INFRASTRUCTURE TECHNICAL MAINTENANCE (URRAN PROJECT)

• Cherkesov G.N., Stepanov Yu.V.
  APPLICATION OF GENERAL SOLUTION FOR A SYSTEM OF LOGICAL EQUATIONS IN DEPENDABILITY TASKS

The article proposes a new method of solving logical equations with one or more unknown variables and systems of logical equations that use a modified truth table. This method allows finding all general solutions. Solvability conditions of equation systems have been found. The theory has been illustrated by examples. Technical applications have been shown.
Keywords: dependability, logical model of dependability, logical and probabilistic analysis of dependability, general solution of logical equation systems, modified truth table, indicator, solvability conditions.

• Ninchuk V.S., Chepurko V.A.
  ABOUT CHECKING OF RANDOMNESS OF DATA WITH TIES

The paper considers research of various nonparametric methods of checking a hypothesis of randomness of sampled data in a situation when these data contain repeating (tied) observations. The repeating observations named ties lead to ambiguous ranking. The arithmetic-mean rank is usually assigned to elements of the tied group. As a result, statistical decision rules change as the criterion statistics changes its distribution. This paper is devoted to research of capacity of various criteria at presence of ties.
Keywords: tied group, rank, inversion, Spearman test, Kendall test, integral test.

• Kats B.A.
  SYSTEM OF SCHEDULED PREVENTIVE REPAIRS: THE LESSONS OF HISTORY

In 2013 it was 90 years since the first steps were made toward organizing the repair of industrial hardware on a schedule basis, and 80 years since developing and testing the system of scheduled preventive repairs (SPR) based on periodical repairs at plants. The goal of the paper is to remind of the first steps and milestones of development of SPR system. The author believes that some lessons from those bygone days are still valid today.
Keywords: system of scheduled preventive repairs, SPR.

• Sverdlov A.B.
  DEPENDABILITY ANALYSIS OF GAS COMPRESSION UNITS

The paper presents basic results of dependability analysis of gas-compressor unit (GCU) operated by gas-transport enterprises of Russia. It also considers fundamental constructive and functional features of GCU, issues of dependability support in the gas industry. In addition to that the structural-functional model of dependability (CFMD) GCU is offered, which was developed on the basis of carried out of GCU dependability research.
Keywords: gas-compressor unit, reliability, refusal, probability of non-failure operation.

• Nosov М.В.
  METHOD OF COMPLETE DECOMPOSITION OF BRIDGE CONNECTIONS IN CONNECTIVITY ANALYSIS PROBLEMS OF STRUCTURALLY COMPLEX BIPOLAR NETWORKS

The paper considers the method of complete decomposition of bridge (cross) connections of structurally complex bipolar networks whose content is the generalization algorithm of the well-known Moore-Shannon’s decomposition formula for analysis of connectivity of a ladder bridge bipolar network. The offered method allows for considerably reducing a number of analyzed states as compared to known combinatory methods, e.g. an exhaustion method of elements’ states [2].
Keywords: analysis, probability, connectivity, decomposition, Moore-Shannon’s decomposition formula, system, random graph, bipolar network, bridge connections, binominal coefficient, combination.

• Ishkov A.S., Zuyev V.D.
  METHOD OF EVALUATION OF GAMMA-PERCENTILE TIME TO FAILURE OF INFORMATION AND MEASUREMENT SYSTEMS BASED ON THE RESULTS OF SHORT-TERM TESTS

Elementwise evaluation of dependability measures is carried out during designing information - measuring systems. Climatic conditions essentially affect operability of resistors. The paper offers evaluation methodology of resistors’ dependability measures, which is used at change of their operation conditions. Based on results of short-term reliability tests in the specified conditions, dependability measures of resistors are calculated by prediction of electric parameters values of resistors during their life..
Keywords: short-term tests, temperature, prediction, resistor, probability.

Functional reliability. The theory and practice

• Plotnikov N.I.
  THE BASES OF NUMAN - OPERATOR DEPENDABILITY THEORY

The paper presents the bases of human - operator (pilot) dependability theory. The major property of human activity is called a category of assignment. The assignments can be estimated in structured generic segmentation of dependability concept. This study also shows that the time scale is the universal basis for segmentation of human dependability concept.
Keywords: operator, pilot, assignment, individual dependability, occupational dependability, functional dependability.

Information

• Book by Shubinsky I.B. «Structural Reliability of Information Systems»
• Book by Shubinsky I.B. «Functional Reliability of Information Systems»
  
• Training courses in reliability - Gnedenko Forum