RT&A
2016,
# 2(41) Vol.11
Sergey Grodzensky
INFORMATION TECHNOLOGY IN THE HOLY LAND
The Second International Symposium on Applied stochastic
models in reliability theory, the science of life and
management of processes that determined the abbreviation
SMRLO'16 (The Second International Symposium on Stochastic
Models in Reliability Engineering, Life Science and
Operations Management) has been held in the city Be'er Sheva
(Israel).
Volodarsky V. A.
ABOUT TRIGONOMETRIC DISTRIBUTIONS TO DESCRIBE THE FAILURE OF
TECHNICAL DEVICES
There has been proposed and investigated the non-traditional
trigonometric distribution to describe the gradual failure
of technical devices.
Guliyev H.B.
METHOD AND ALGORITHM OF FUZZY CONTROL OF REACTIVE CAPACITY AND
VOLTAGE PROVIDING REGIME RELIABILITY OF ELECTRIC NETWORKS
The structure and algorithm of the voltage and reactive
power control system for distribution networks with on site
power sources containing fuzzy logic controller (FLC) is
presented. The controlling parameters are: the transformers
voltage ratio and capacities of the reactive power sources
in distribution networks. The placement of reactive power
sources, their values and also transformers regulator’s
positions are determined using traditional methods of
optimization for selected networks. The structure of
reactive power sources and transformers voltage ratio
control system containing the fuzzy logic controller is
presented in this paper. The problem of optimal correction
of transformers voltage ratio and power sources at time of
their deviation from the preset values to minimize losses in
studied network and maintaining of nodes voltages on the
necessary level is considered. The algorithm of membership
function formation for input variables of FLC to control /
correct capacitors value is shown. Modeling results for real
electrical circuit, reactive capacity correction in nodes
and transformers impact on losses and voltage profile in
studied network are presented.
Yu. Paramonov
DANIELS' EPSILON-SEQUENCE AND MODELLING OF RELIABILITY OF
UNIDIRECTIONAL FIBROUS COMPOSITE
This is a new version of the Daniels' sequence (DS) for
analyzing the relation of the static strength of
unidirectional fiber composite (UFC) component with a
fatigue life, a static and a residual tensile strength of
UFC itself. The DS allows to explain the existence of
fatigue strength, the residual strength and the dependence
of static strength on the rate of a tensile test. It
explains the structure of these processes of the UFC
failure, but to get a numerical result some new hypotheses
are needed. New version of the DS allows to simplify a
problem of the regression analysis of test data and the
prediction of the UFC parameter changes in case of changes
of the parameters of its component.
Farhadzadeh E.M., Muradaliyev A.Z., Abdullayeva S.A.
CRITERIA THE ESTIMATION EXPEDIENCY OF CLASSIFICATION INFORMATION
ON RELIABILITY OF THE EQUIPMENT AND DEVICES EPS
Analysis of statistical data about refusals, maintenance
service and repair of objects of electric systems, is an
indispensable condition of a quantitative estimation of
reliability of their work. The analysis assumes
classification of data on a sort of attributes and their
versions. Thus, the basic question there is a revealing
significant version of attributes. The importance of an
attribute established based on statistical criteria of check
of hypotheses. The criteria based on boundary fiducially
estimation of intervals are offered.
S. Amala Revathy, B. Chandrasekar
RELIABILITY PERFORMANCE MEASURES OF SYSTEMS WITH LOCATION-SCALE
GENERALIZED ABSOLUTELY CONTINUOUS MULTIVARIATE EXPONENTIAL
FAILURETIME DISTRIBUTION
This paper deals with the equal marginal location-scale
Generalized Absolutely Continuous Multivariate Exponential
model. The distributional properties and applications of the
location-scale model arising out of the k-parameter
Generalized Absolutely Continuous Multivariate Exponential
distribution are studied. Standby, parallel, series and
relay systems of order k with location-scale Generalized
Absolutely Continuous Multivariate Exponential failuretimes
are discussed and their performance measures are obtained.
The optimal estimators of the meantime before failure times
are also derived.
A Krishnamoorthy, M. K. Sathian,
Viswanath C Narayanan
RELIABILITY OF A
k-OUT-OF-n SYSTEM WITH REPAIR BY A SINGLE SERVER EXTENDING
SERVICE TO EXTERNAL CUSTOMERS WITH PRE-EMPTION
In this paper we study the reliability
of a k-out-of-n system, with a single technician, who also
renders service to external customers besides repairing the
failed components in the system. For optimizing the revenue
from external service without compromising the system
reliability, we introduce the N-policy in which the repair
of the internal customers (failed components) starts only on
accumulation of N failed components. The service to external
customers is of preemptive nature in the sense that their
service can be interrupted on accumulation of N failed
components. It is assumed that an external customer, who
finds the server busy with an external customer at the epoch
of its arrival joins a queue of infinite capacity; whereas
an external customer who finds the server busy with an
internal customer leaves the system forever. The failure
times of the components of the k-out-of-n system follow an
exponential distribution; the arrival of external customers
is according to a Poisson process and the service times of
the internal and external customers follow non-identical
phase-type distributions. Using matrix-analytic methods, we
discuss the system stability and steady state distribution.
A special case of the model where the underlying
distributions are all exponential has been considered, to
obtain an expression for the stability condition and a
product form solution for the steady state have been
obtained for this case. Also several system performance
measures have been obtained explicitly. Analysis of a cost
function indicates that N-policy does help to optimize the
system revenue maintaining high system reliability.
