Performance reliability analysis of multi-state degraded system with improved Lz transform

Author(s):  
Yubin Zheng ◽  
Jie Song ◽  
Yingzhi Zhang ◽  
Shengdong Hou ◽  
Jun Zheng

Universal Generating Functions and Lz transformations have been widely used in the reliability modeling of multi-state systems. In order to solve the problem of complex calculations due to the dense random combination of multi-state performance parameters in the Lz transformation, a screening function is defined before the Lz transformation, and the screening function is combined with the performance threshold to screening the state performance parameters in advance, and the process is simplified through the screen matrix and the screen block diagram, effectively reduce the combined dimensions and quantity, improve the efficiency of reliability analysis, and combine with specific examples for application verification.

2010 ◽  
Vol 118-120 ◽  
pp. 561-565
Author(s):  
Shi Yi Bao ◽  
Wei Ping Wang ◽  
Jian Xin Zhu ◽  
Zeng Liang Gao

This paper proposes a new reliability modeling and analysis approach based on Stochastic Petri Nets by employing the logical relations in the RBD to cope with the inadequacy in various quantitative reliability analysis techniques, such as Reliability Block Diagram (RBD) and Markov analysis of control system in process industry. In this paper, the proposed new approach is elaborated and its feasibility and effectiveness is illustrated in a study case. As the results show, the proposed approach is demonstrated more straightforward and visual than Markov method. This research also bears significance in its application in the reliability analysis of general system in process industry.


2013 ◽  
Vol 347-350 ◽  
pp. 2590-2595 ◽  
Author(s):  
Sheng Zhai ◽  
Shu Zhong Lin

Aiming at the limitations of traditional reliability analysis theory in multi-state system, a method for reliability modeling and assessment of a multi-state system based on Bayesian Network (BN) is proposed with the advantages of uncertain reasoning and describing multi-state of event. Through the case of cell production line system, in this paper we will discuss how to establish and construct a multi-state system model based on Bayesian network, and how to apply the prior probability and posterior probability to do the bidirectional inference analysis, and directly calculate the reliability indices of the system by means of prior probability and Conditional Probability Table (CPT) . Thereby we can do the qualitative and quantitative analysis of the multi-state system reliability, identify the weak links of the system, and achieve assessment of system reliability.


2019 ◽  
Vol 16 (4) ◽  
pp. 169
Author(s):  
I M Yannikov ◽  
M V Telegina

The paper assesses the existing approaches to the problem of assessing the security of hazardous facilities. It is proposed to carry out an assessment using the system of modeling and calculating the state of protection of hazardous objects developed on the basis of the Clements-Hoffman method, in which a set of threats, protection mechanisms and objects of protection are used to describe the system of protection with full overlap. This system can be used to calculate any type of protection of hazardous objects when entering data on any threats and appropriate means of protection. The paper provides a block diagram of the security system, a functional diagram, the main parameters and stages of development and testing.


Author(s):  
Ahmad Khayyati ◽  
Mohammad Pourgol-Mohammad

Abstract Unmanned Aerial Vehicles (UAV) are increasingly get popularity in many applications. Their operation requires high level of safety and reliability to accomplish successful missions. In this study, the reliability was comparatively analyzed by different available approaches to select the efficient method. First, failure model of the system is developed. Then, three different scenarios are considered to study the effect of redundancies on the system reliability results. In the first scenario, there is no redundancy where in the second scenario there is only one redundant component and in the third scenario, there are three redundant components. Static reliability analysis such as Fault Tree Analysis (FTA), Reliability Block Diagram (RBD), Markov Chain (MC), and Bayesian Networks (BN) are applied on proposed scenarios and results are obtained. Regarding to time dependencies between redundant components, a dynamic-based methodology is also developed in this study through applying Dynamic Fault Tree (DFT) analysis. Proposed static and dynamic approaches are applied on an UAV as a case study and results are discussed. Finally, characteristics of each methodology and related conditions are clarified for selecting the efficient reliability analysis approach.


Open Physics ◽  
2018 ◽  
Vol 16 (1) ◽  
pp. 938-942 ◽  
Author(s):  
Xiaowei Yin ◽  
Wenxue Qian ◽  
Hoang Pham

AbstractEscalators are now more and more widely used around the world. As escalator accidents occur from time to time, it is very important to analyze the structure and reliability of escalators. This paper studies the structure and reliability analysis methods of typical escalators. By applying parametric analysis methods, the efficiency and accuracy of escalator structure analysis are greatly improved. Because the failure of each structural member of the escalator truss system is dependent, this paper applies the dependent failure reliability modeling method and analyzes the reliability of the escalator truss system. The results show that the reliability analysis method of the truss system after considering the dependent failure is more reasonable. The above research work has certain reference significance for the design and analysis of escalators.


2012 ◽  
Vol 522 ◽  
pp. 529-534
Author(s):  
Ya Xin Zhang ◽  
Hai Li Pan ◽  
Tao Yang

Reliability and availability are important symbols which weigh the reliability of product. Chemical production equipment system is consisted of many single devices. Due to special dangerous, the reliability analysis to whole equipment system is very important to keeping the safety of production process. In this article, to chemical process equipment system, the reliability calculation method, basic principles, basic assumptions and calculation program are described. To a aromatic semi-renewable dehydration process system, by using the reliability calculated method above, the fault tree and reliability block diagram are derived, the system reliability and availability are accounted, the corresponding reliability and availability curves are obtained and the main factors influencing the reliability of the system are analyzed.


2002 ◽  
Vol 39 (2) ◽  
pp. 359-369 ◽  
Author(s):  
N. Barbot ◽  
B. Sericola

We consider an infinite-capacity buffer receiving fluid at a rate depending on the state of an M/M/1 queue. We obtain a new analytic expression for the joint stationary distribution of the buffer level and the state of the M/M/1 queue. This expression is obtained by the use of generating functions which are explicitly inverted. The case of a finite capacity fluid queue is also considered.


2018 ◽  
pp. 65-70
Author(s):  
M. Yastrebenetskyi

The Kharkiv Subsidiary of the State Enterprise “Scientific and Technical Center for Nuclear and Radiation Safety” (SSTC NRS) started its history on 12 April 1993 with the establishment of the NPP I&C Reliability Analysis Department in Kharkiv within the back then Scientific and Technical Center for Nuclear and Radiation Safety (STC NRS). The author of the paper tells about the history of the Kharkiv Subsidiary, areas of activities, obtained results and prospects for the development.


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