Investigation of System Reliability Depending on Some System Components States

System reliability/availability is a complex concept that is evaluated based on numerous indices and measures. There are different methods for the calculation of these indices and measures in reliability analysis. Some of the most used indices are important measures. These measures allow us to evaluate the influence of fixed system components or set of components to the system reliability/availability. Importance measures are used today to allow for various aspects of the impact of system elements on its failure or operability. Analysis of element importance is used in the system design, diagnosis, and optimization. In this paper new algorithms for the calculation, some of the important measures are developed based on the matrix procedures. This paper's goal is the development of a new algorithm to calculate importance measures of the system based on the matrix procedures that can be transformed in the parallel procedures/algorithms. These algorithms are developed based on the application of Logical Differential Calculus of Boolean logic for the important analysis of the system. The application of parallel algorithms in importance analysis allows the evaluation of the system of large dimensions. Importance specific of the proposed matrix procedures for calculation of importance measures is the application of structure-function for the mathematical representation of the investigated system. This function defined the correlation of the system components states and system reliability/ availability. The structure-function, in this case, is defined as a truth vector to be used in the matrix transformation. The truth vector of a Boolean function is a column of the truth table of function if the values of the variables are lexicographically ordered. Therefore, the structure-function of any system can be represented by the truth vector of 2n elements un-ambiguously.

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Reliability Analysis of Mofor Injection Substation

Advances in Computer and Electrical Engineering - Handbook of Research on Engineering Innovations and Technology Management in Organizations ◽

10.4018/978-1-7998-2772-6.ch005 ◽

2020 ◽

pp. 91-105

Author(s):

Oladimeji Joseph Ayamolowo ◽

Ayodeji Olalekan Salau

Keyword(s):

Power System ◽

Power Supply ◽

System Reliability ◽

Power Distribution ◽

Reliability Assessment ◽

Power Delivery ◽

Distributed Generators ◽

System Components ◽

Availability Index ◽

Continuous Power

Failure of power system components cause undue interruptions to Power Supply thereby affecting the Overall System reliability. Consequently, Power system reliability assessment is important for high-quality and continuous power delivery to consumers. This chapter presents the reliability assessment of Mofor Injection Substation. The performance evaluation of Mofor Injection Substation is evaluated using various system parameters which regulate the operation of the Substation. Statistical data from January, 2017 to December, 2017 were used to analyze the Substation. The results gave a power availability index (ASAI) of 0.7683796 and 0.768968 for Ekete and Orhuworun substation, respectively, due to the unavailability of strategically placed distributed generators (DGs). The aforementioned reliability result revealed that the power distribution at Mofor Injection Substation can be said to be unreliable, inefficient, undesirable, and Unstable.

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A Method to Account for Personnel Risk Attitudes in System Design and Maintenance Activity Development

Systems ◽

10.3390/systems8030026 ◽

2020 ◽

Vol 8 (3) ◽

pp. 26

Author(s):

Benjamin W. Rathwell ◽

Douglas L. Van Bossuyt ◽

Anthony Pollman ◽

Joseph Sweeney

Keyword(s):

Systems Engineering ◽

System Reliability ◽

Risk Attitude ◽

Risk Attitudes ◽

Maritime Industry ◽

System Components ◽

Engineering Practices ◽

Future Work ◽

Insight Into ◽

New System

Systems engineering practices in the maritime industry and the Navy consider operational availability as a system attribute determined by system components and a maintenance concept. A better understanding of the risk attitudes of system operators and maintainers may be useful in understanding potential impacts the system operators and maintainers have on operational availability. This article contributes to the literature a method that synthesizes the concepts of system reliability, and operator and maintainer risk attitudes to provide insight into the effect that risk attitudes of systems operators and maintainers have on system operational availability. The method consists of four steps providing the engineer with a risk-attitude-adjusted insight into the system’s potential operational availability. Systems engineers may use the method to iterate a system’s design or maintenance concept to improve expected operational availability. If it is deemed necessary to redesign a system, systems engineers will likely choose new system components and/or alter their configuration; however, redesign is not limited to physical alteration of the system. Several other options may be more practical depending the system’s stage in the life cycle to address low risk-adjusted operational availability such as changes to maintenance programs and system supportability rather than on component and system reliability. A simple representative example implementation is provided to demonstrate the method and discussion of the potential implications for Navy ship availability are discussed. Potential future work is also discussed.

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NEW MATRIX BASED ALGORITHM FOR CALCULATION OF IMPORTANCE MEASURES

Системи управління навігації та зв’язку Збірник наукових праць ◽

10.26906/sunz.2019.6.033 ◽

2019 ◽

Vol 6 (58) ◽

pp. 33-37

Author(s):

P. Sedlacek ◽

A. Forgac ◽

E. Zaitseva

Keyword(s):

Structure Function ◽

System Reliability ◽

Boolean Logic ◽

Mathematical Representation ◽

System Components ◽

The Matrix ◽

Importance Analysis ◽

Complex Term ◽

The Impact ◽

Fixed System

The system reliability/availability is complex term that is evaluated based on numerous indices and measures. There are different methods for the calculation of these indices and measures. Some of the most used are importance measures. These measures allow to evaluate the influence of fixed system components or set of components to the system reliability/availability. Importance measures are used to allow for various aspects of the impact of system elements on its failure or operability. Analysis of element importance is used in the system design, diagnosis, and optimization. In this paper new algorithm for the calculation some of importance measures is developed based on the matrix procedures. This paper goal is development of new algorithm to calculate importance measures of the system based on the matrix procedures that can be transformed in the parallel procedures/algorithm. This algorithm is developed based on the application of Logical Differential Calculus of Boolean logic for importance analysis of system. The application of parallel algorithm in importance analysis allows the evaluation of system of large dimension. Importance specific of the proposed matrix procedures for calculation of importance measures is the application of structure function for the mathematical representation of investigated system. This function defined the correlation of the system components states and system reliability/ availability. The structure function in this case is defined as truth vector to be used in the matrix transformation. The truth vector of Boolean function is column of the truth table of function if the values of the variables are lexicographically ordered

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VTS ZATOKA RADAR SYSTEM RELIABILITY AND AVAILABILITY ANALYSIS

International Journal of Reliability Quality and Safety Engineering ◽

10.1142/s0218539307002787 ◽

2007 ◽

Vol 14 (06) ◽

pp. 537-545 ◽

Cited By ~ 1

Author(s):

TYMOTEUSZ BUDNY

Keyword(s):

System Reliability ◽

Radar System ◽

Service Support ◽

Availability Analysis ◽

System Components ◽

Reliability And Availability

In the paper we calculate reliability of radar system in Vessel Traffic Services Zatoka. Reliability and availability of the system were calculated on the base of reliability of the system components. There was assumed that system is a series-"m out of n". Conclusion is that appropriate evaluation of system reliability and availability is decisive in choosing service support location.

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Multi-Valued Decision Diagram Based Reliability Analysis of Demand-Based Warm Standby Systems with Imperfect Fault Coverage

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.513-517.4161 ◽

2014 ◽

Vol 513-517 ◽

pp. 4161-4166

Author(s):

Rui Peng ◽

Qing Qing Zhai ◽

Lei Shi ◽

Jun Yang

Keyword(s):

System Reliability ◽

Fault Tolerant ◽

Fault Coverage ◽

Time To Failure ◽

Element Level ◽

System Components ◽

Real World Applications ◽

Coverage Models ◽

Time And Energy ◽

Warm Standby

In many real-world applications, warm standby redundancy is a commonly applied technique that can compromise recovery time and energy consumption in the fault-tolerant system design. It is considered as a generalization of cold standby and hot standby techniques and has attracted lots of research attentions. In this paper, a demand-based warm standby system subject to imperfect fault coverage is studied. The demand-based system consists of components with different capacities and fails if the cumulative capacity of working components is lower than the desired system demand. To adapt to different fault covering mechanisms, this paper considers two different kinds of fault coverage models, i.e. element level coverage and fault level coverage. A multi-valued decision diagram based approach is proposed to analyze the system reliability. The suggested method is combinatorial and has no limitation on the type of time-to-failure distributions for system components. An example is presented to illustrate the application and advantage of the proposed method.

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Components Importance Analysis Fault Tree of Power Transformer of Gi Simangkuk Switchyard in Indonesia

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.694-697.907 ◽

2013 ◽

Vol 694-697 ◽

pp. 907-910 ◽

Cited By ~ 1

Author(s):

Josep Franklin Sihite ◽

Takehisa Kohda

Keyword(s):

System Reliability ◽

Power Transformer ◽

Fault Tree ◽

Importance Measure ◽

Component Importance ◽

Safety Improvement ◽

System Components ◽

Importance Analysis

The purpose of this paper is to study the importance measures of power transformer system components. Importance measures analysis is a key part of the system reliability quantification process which are most effective towards safety improvement. This paper presented an application and results of the importance measures analysis of a power transformer system of GI Simangkuk switchyard in Indonesia by using Birnbaum importace measures, critically importance measure, and Fussel-Vessely importance measures. These method present the rank of the component importance measures quantitavily according to their contribution to system reliability and safety.

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