International Journal of Reliability, Risk and Safety: Theory and Application最新文献_第6页

Life extension for a coherent system through cold standby and minimal repair policies for their independent components 通过冷备用和对其独立组件的最小维修策略来延长连贯系统的使用寿命

International Journal of Reliability, Risk and Safety: Theory and Application Pub Date : 2020-07-01 DOI: 10.30699/ijrrs.3.2.6

S. Mirjalili, J. Kazempoor

引用次数: 3

COVID-19 Infection Risk Index Estimation in Flight Destinations (case study: Kish Air destinations) 航班目的地COVID-19感染风险指数估算(以基什航空目的地为例)

International Journal of Reliability, Risk and Safety: Theory and Application Pub Date : 2020-07-01 DOI: 10.30699/ijrrs.3.2.8

I. Shafieenejad, S. Ghasemi, M. Siami

{"title":"COVID-19 Infection Risk Index Estimation in Flight Destinations (case study: Kish Air destinations)","authors":"I. Shafieenejad, S. Ghasemi, M. Siami","doi":"10.30699/ijrrs.3.2.8","DOIUrl":"https://doi.org/10.30699/ijrrs.3.2.8","url":null,"abstract":"This paper proposes a risk assessment method for estimating theCOVID-19 Infection risk index in flight destinations based on the pair wise comparison method to solve the problem of health monitoring devices shortage in airlines. In this research, Kish Airlines flight destinations are considered as a case study. By considering the importance of continuing air travel during COVID-19 pandemic, one of the most effective ways for decreasing the risk of infection to COVID-19 in air travel is establishing health monitoring stations at the airport gates. Because of the enormous number of airports and airline routes, nationwide coverage of them by the establishment of the health monitoring stations is unimaginable. Therefore, in this paper, the pair wise comparison method used for evaluating COVID-19 infection risk index in selected flight destinations and to evaluate the optimal policy for allocation of health monitoring equipment in Kish Airline destinations a geostatistical map is designed based on the calculated infection risk score. Keyword: COVID-19; Infection Risk index; Risk assessment model; Pair wise comparison. Nomenclature and units The Notation to be used in this paper listed as follows: The probability parameter superiority Systems step number The probability of selected member winning in the comparison process The numerical value of the input parameter","PeriodicalId":395350,"journal":{"name":"International Journal of Reliability, Risk and Safety: Theory and Application","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122636106","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Determination of Optimum Sample Size for Lot Acceptance Attribute Sampling under Life Tests Based On Rayleigh Distribution Using Graphical Evaluation Review Technique (GERT) 基于瑞利分布的寿命试验批次验收属性抽样的最佳样本量确定

International Journal of Reliability, Risk and Safety: Theory and Application Pub Date : 2020-07-01 DOI: 10.30699/ijrrs.3.2.11

P. Kumarasamy, S. Nagarathinam, T. Asif

引用次数: 0

Reducing Risk and Increasing Reliability and Safety of Compressed Air Systems by Detecting Patterns in Pressure Signals 通过检测压力信号的模式来降低风险，提高压缩空气系统的可靠性和安全性

International Journal of Reliability, Risk and Safety: Theory and Application Pub Date : 2020-07-01 DOI: 10.30699/ijrrs.3.2.10

D. Sanders, M. Thabet, V. Becerra

引用次数: 0

Application of a Model-Based Fault Detection Approach on a Spacecraft 基于模型的航天器故障检测方法的应用

International Journal of Reliability, Risk and Safety: Theory and Application Pub Date : 2020-07-01 DOI: 10.30699/ijrrs.3.2.3

Alireza Alikhani, G. Sharifi

引用次数: 1

A Combined AHP-PROMETHEE Approach for Intelligent Risk Prediction of Leak in a Storage Tank 基于AHP-PROMETHEE的储罐泄漏智能风险预测

International Journal of Reliability, Risk and Safety: Theory and Application Pub Date : 2020-07-01 DOI: 10.30699/ijrrs.3.2.7

D. Sanders, Favour Ikwan, M. Haddad

引用次数: 6

Computation of Importance Measures Using Bayesian Networks for the Reliability and Safety of Complex Systems 用贝叶斯网络计算复杂系统可靠性和安全性的重要性测度

International Journal of Reliability, Risk and Safety: Theory and Application Pub Date : 2020-07-01 DOI: 10.30699/ijrrs.3.2.12

S. A. Raza, Q. Mahboob, A. A. Khan, T. Khan, J. Hussain

引用次数: 2

Probabilistic Life Assessment of Gas Turbine Blade Alloys under Creep 蠕变作用下燃气轮机叶片合金的概率寿命评估

International Journal of Reliability, Risk and Safety: Theory and Application Pub Date : 2020-07-01 DOI: 10.30699/ijrrs.3.2.2

Bita soltan Mohammadlou, Mohammad Pourgolmohamad, M. Yazdani

{"title":"Probabilistic Life Assessment of Gas Turbine Blade Alloys under Creep","authors":"Bita soltan Mohammadlou, Mohammad Pourgolmohamad, M. Yazdani","doi":"10.30699/ijrrs.3.2.2","DOIUrl":"https://doi.org/10.30699/ijrrs.3.2.2","url":null,"abstract":"Deformations occur gradually in the gas turbine components since they are working under high temperature and stress. In the turbine blade alloys, creep is the most significant failure mechanism. In this research, creep life has been estimated for the blade alloys by considering humidity. A method is proposed to estimate the creep life by direct consideration of humidity on the creep life of the gas turbine blade. In the proposed model, the humidity factor is added to the classic Larson Miller creep life estimation method. This model is capable of predicting creep life with known dry temperature (Water Air Ratio=0), mechanical stress, and humidity. In this approach, there is no need to measure blade temperature variation during operation. As a case study, the creep life of first-stage turbine blade alloy is predicted using the proposed method and benchmarked with published (Finite element analysis) FEA results. The reliability of the blades was estimated by considering different success criteria using Monte Carlo simulation. The reliability of the creep rupture life of Nimonic-90 steel was carried out using SCRI mode based on the Z-parameter. The scattered data has been considered for creep rupture of materials in this part. The results show that creep life increases with humidity increase. It is also shown that with an increase in mechanical stress and temperature fluctuations, the reliability of the turbine blade creep life decreases sharply. Keyword: Creep life prediction; Failure mechanism; Gas turbine blade; Humidity; Nimonic 90; Reliability; SCRI method","PeriodicalId":395350,"journal":{"name":"International Journal of Reliability, Risk and Safety: Theory and Application","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114967760","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Bayesian Inference of Reliability Growth-Oriented Weibull Distribution for Multiple Mechanical Stages Systems 面向多机械阶段系统可靠性增长的威布尔分布的贝叶斯推断

International Journal of Reliability, Risk and Safety: Theory and Application Pub Date : 2020-01-01 DOI: 10.30699/IJRSS.2020.216829.1040

M. Nadjafi, P. Gholami

{"title":"Bayesian Inference of Reliability Growth-Oriented Weibull Distribution for Multiple Mechanical Stages Systems","authors":"M. Nadjafi, P. Gholami","doi":"10.30699/IJRSS.2020.216829.1040","DOIUrl":"https://doi.org/10.30699/IJRSS.2020.216829.1040","url":null,"abstract":"The Duane and Crow-AMSAA reliability growth model has been traditionally used to model systems and products undergoing development testing. The Non-Homogeneous Poisson Process (NHPP) with power intensity law has often been used as a model for describing the failure pattern of repairable systems and maximum likelihood (ML) estimates are used to calculate the unknown parameters widely. This study proposes the statistical analysis method of different stages and different level data based on Bayes analysis techniques. To this end, the Bayesian reliability growth model of multiple stages is coupled with the Weibull distribution product. By using the unique properties of the assumed prior distributions, the moments of the posterior distribution of the failure rate at various stages during a development test can be found. In this work, it is assumed that the scale parameter has a Gamma prior density function, and the growth parameter has a Uniform prior distribution. Monte Carlo simulations are used to compute the Bayes estimates. Finally, the results obtained from the proposed method by implementing it on an application example are compared with Crow-AMSAA data and show that the proposed model has higher accuracy than the existing traditional methods.","PeriodicalId":395350,"journal":{"name":"International Journal of Reliability, Risk and Safety: Theory and Application","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125000190","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Triple-Triple Redundant Reliable Onboard Computer Based on Multicore Microcontrollers 基于多核单片机的三三冗余可靠板载计算机

International Journal of Reliability, Risk and Safety: Theory and Application Pub Date : 2018-09-01 DOI: 10.30699/ijrrs.1.17

G. Kahe

{"title":"Triple-Triple Redundant Reliable Onboard Computer Based on Multicore Microcontrollers","authors":"G. Kahe","doi":"10.30699/ijrrs.1.17","DOIUrl":"https://doi.org/10.30699/ijrrs.1.17","url":null,"abstract":"The flight control system must meet extremely high levels of functional integrity and availability. The control algorithm is processed by onboard computer (OBC). To meet the reliability requirements for onboard computers, various type of redundancy must be employed. In this paper, we concerned with the triple modular redundancy (TMR) for an onboard computer with aerospace application. In the proposed architecture, control inputs and system states are measured using designated sensors. According to the acquired data, mission scenario and control algorithm are processed by the processing unit. Thereafter, the results are applied to the system by actuators.TMR technology in component level is used to improve the reliability of OBC according to the system requirements. All of the constituent modules of OBC, comprising processing unit, bus interface, sensor, actuators, and IO devices, benefits from triple redundancy. The case study shows that the similar architecture is used for high reliable flight computer of passenger airplanes except that our architecture is based on the available multicore microcontrollers. The reliability of the designed onboard computer is evaluated analytically, which indicates that the proposed OBC can meet the reliability requirements.","PeriodicalId":395350,"journal":{"name":"International Journal of Reliability, Risk and Safety: Theory and Application","volume":"81 ","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133685993","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3