The paper examines the relevance of the development of a simulation model of aircraft dependability structure for the purpose of analyzing the processes of after-sale service of military aircraft. It also describes the developed simulation model and the results of simulation.

A higher economic efficiency of equipment dependability testing can be achieved by means of reduced testing time or smaller quantity of test samples. The reduction of testing time increases sample censoring, while a lower quantity of test samples decreases the volume of equipment operating times sample. Test parameters may be reduced only if information processing methods ensure the validity of the calculated dependability indicators.

As the result of the tests, small censored samples of equipment mean times to failure are generated. Dependability calculation using such samples is performed through the maximum likelihood method. The article presents the findings of experimental studies of precision of maximum likelihood parameter estimation of exponential law over small singly right censored samples. The studies were performed by means of computer simulation of censored samples similar to those generated as the result of equipment dependability testing. These experimental data show that most maximum likelihood estimates obtained over small singly right censored samples have significant deviations from true values.

This paper features regression models establishing dependence between deviation of maximum likelihood estimates from true values and parameters defining the sample structure. They allow calculating and introducing corrections to maximum likelihood estimates. Experimental studies of their application efficiency were conducted. The accuracy of maximum likelihood estimates significantly increased upon application of the developed models and correction of maximum likelihood estimates. Software for application of regression models was developed.

The paper presented analysis of experimental and theoretical studies of electric low-frequency fluctuations in solids. The possibility of extensive use of low-frequency fluctuations for solid material nondestructive testing is shown. Effectiveness of fluctuation nondestructive testing of solid materials is justified. The paper also highlights the applicability of fluctuation nondestructive testing to increase dependability of electronic devices.

The paper shows that one of the ways of getting non-porous ceramic materials based on silicon carbide can be using aluminum oxide as an additive. The paper also offers the quality assessment forecast method for highly rigid and brittle ceramic materials using the criterion of their surface fragility.

With the advent of market economy in Russia the role of the decision-making stage in the development of high-technology products significantly rose in significance. The article analyzes the mathematical model of decision-making used in the development of complex engineering systems (CES) that allows identifying the optimal engineering solutions out of a number of alternatives. In order to define the “efficiency” of CES and primary criteria thereof the authors set forth a number of classifications of decision-making techniques along with their main features. They also provide the results of comparative analysis of the best known decision-making techniques, as well those used for evaluation of innovation projects.

The paper describes the essence of glitches, their emergence and influence on the results of a system’s operation. Methods of identification of transient failures are considered. The paper describes methods of protection against glitches and offers an integrated approach to ensuring the resilience of a system to glitches. The principle put forth in the paper shows what key property a system has to own to be resilient to glitches. The paper further provides an example and a conclusion on the study results.

The paper presents the analysis of domestic and foreign scientific, methodology and normative documents on methods and criteria for identification of critical subsystems and nodes of important economic objects and research in their behavior in abnormal situations. The authors of the paper have studied approaches to evaluation of exposure of various facilities to anthropogenic disturbances and systemized criteria and factors significant for evaluation of impacts of disturbances and step-by-step action factors.

The paper offers an approach to definition of a limit tolerance state of railway equipment based on the criterion that exploitation of an object on the basis of risk evaluation is unacceptable. Criteria of limit tolerance states shall be specified in specifications for railway equipment.

Our late colleague Nikolai Olegovich Demidovich developed and gave us a great method of sequential control of dependability (and other similar properties of products) that is significantly superior to the “classic” Wald’s method (featured in all textbooks). Not many people can now recognize Demidovich’s method in GOST R 27.402-95 and IEC 61124. His first articles date back to the 1960s. The method that uses computers and formulas allows choosing the sequential control boundaries that ensure the accuracy of specified risks values. N.O. Demidovich’s boundaries can create indecision regions of any shape (including closed ones) and do not require truncation. The purpose of this article is to reestablish N.O. Demidovich’s (and Russia’s) priority in sequential control and replace Wald’s method (paying the latter the well-deserved tribute of course).

BOOK BY I.B.SHUBINSKY STRUCTURAL RELIABILITY OF INFORMATION SYSTEMS

BOOK BY I.B.SHUBINSKY FUNCTIONAL RELIABILITY OF INFORMATION SYSTEMS