scholarly journals Discrete Time Semi-Markov Model of a Two Non-Identical Unit Cold Standby System with Preventive Maintenance with Three Modes

2015 ◽  
Vol 4 (4) ◽  
pp. 277 ◽  
Author(s):  
Medhat Ahmed El-Damcese
Keyword(s):  
Markov Model ◽  
Discrete Time ◽  
Preventive Maintenance ◽  
Cold Standby ◽  
Standby System ◽  
Identical Unit

RELIABILITY MEASURES OF A COLD STANDBY SYSTEM WITH PREVENTIVE MAINTENANCE AND REPAIR

2013 ◽  
Vol 20 (06) ◽  
pp. 1350022 ◽  
Author(s):  
S. C. MALIK ◽  
SUDESH K. BARAK
Keyword(s):  
Preventive Maintenance ◽  
Failure Time ◽  
Reliability Measures ◽  
Maintenance And Repair ◽  
Regenerative Point ◽  
Cold Standby ◽  
Semi Markov Process ◽  
Standby System ◽  
Regenerative Point Technique ◽  
Negative Exponential

The purpose of the present study is to determine reliability measures of a two-unit cold standby system with preventive maintenance and repair. The units are identical in nature subject to constant failure from normal mode. Preventive maintenance of the operative unit is carried out after a pre-specific time "t" up to which no failure occurs. However, repair of the unit is done at its failure. The unit works as new after repair and preventive maintenance. The switch devices are perfect. The distributions of failure time and the time by which unit undergoes for preventive maintenance are taken as negative exponential while that of preventive maintenance and repair times are assumed as arbitrary with different probability density functions. The random variables associated with failure, preventive maintenance and repair times are statistically independent. The semi-Markov process and regenerative point technique are adopted to derive the expressions for system performance measures in steady state. The graphical behavior of MTSF, availability and profit function have been observed with respect to preventive maintenance rate for particular values of other parameters and costs.

A TWO NON-IDENTICAL UNIT COLD STANDBY SYSTEM WITH TWO PHASE REPAIR OF A FAILED UNIT

2019 ◽  
Vol 43 (2) ◽  
pp. 164-177
Author(s):  
RAKESH GUPTA ◽  
◽  
VAISHALI . ◽  
Keyword(s):  
Two Phase ◽  
Cold Standby ◽  
Standby System ◽  
Identical Unit

scholarly journals Contribution to ECDIS Reliability using Markov Model

2014 ◽  
Vol 3 (2) ◽  
pp. 149-157 ◽  
Author(s):  
Dean Sumić ◽  
Dragan Peraković ◽  
Marinko Jurčević
Keyword(s):  
Information System ◽  
Markov Model ◽  
Simulation Model ◽  
System Reliability ◽  
Design Concept ◽  
Cold Standby ◽  
Electronic Chart ◽  
Standby System ◽  
Reliability And Availability ◽  
Bridge System

An Integrated Bridge System (IBS) contains a fully duplicated Electronic Chart Display and Information System (ECDIS). Although duplication should increase system reliability, reliability and availability are not improved. Proper ECDIS maintenance includes updating both: the information system and the provided chart system. This procedure, in practice, tends to decrease reliability and availability. A Markov ECDIS simulation model is given. A new design concept is presented and proposed. The entire ECDIS system is improved by adding a cold standby system preventing the occurrence of errors due to updating and upgrading of the system device.

scholarly journals Effectiveness Analysis of a Two Non-Identical Unit Standby System with Switching Device and Proviso of Rest

2019 ◽  
Vol 4 (6) ◽  
pp. 1496-1507
Author(s):  
Darpandeep Kour ◽  
J. P. Singh Joorel ◽  
Neha Sharma
Keyword(s):  
Random Time ◽  
Switching Device ◽  
Effectiveness Analysis ◽  
Reliability Characteristics ◽  
Proposed Model ◽  
Cold Standby ◽  
Standby System ◽  
Identical Unit ◽  
Standby Mode ◽  
Functional Mode

This paper deals with two-unit cold standby system with switching device and proviso of rest. The system consists of two non-identical units which are connected in parallel redundancy. Initially, the first unit is in operative mode and second is kept in cold standby mode. There is also a proviso for rest for the first unit after a random time from its starting operation. For operation and repair, priority is always given to first unit. A switching device is used to shift the failed unit to repair mode. If the switching device is found non-operational then priority is given to it for repair provided that system is in functional mode. The effectiveness of the proposed system has been carried out by determining various reliability characteristics of the proposed model.

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