International Journal of Reliability, Risk and Safety: Theory and Application最新文献_第4页

Mechanical Equipment Reliability Analysis: Case Study 机械设备可靠性分析:案例研究

International Journal of Reliability, Risk and Safety: Theory and Application Pub Date : 2021-12-01 DOI: 10.30699/ijrrs.4.2.7

Ali Nouri Qarahasanlou, Reza ShakorShahabi, Reza Barabadi, Negar Fallahnejad

{"title":"Mechanical Equipment Reliability Analysis: Case Study","authors":"Ali Nouri Qarahasanlou, Reza ShakorShahabi, Reza Barabadi, Negar Fallahnejad","doi":"10.30699/ijrrs.4.2.7","DOIUrl":"https://doi.org/10.30699/ijrrs.4.2.7","url":null,"abstract":"In civil and mining industries, Wheel loaders are an important component and their cost capability at effective operation. The environmental and operational factors dramatically affect the performance of loaders. In many cases, failure data are often collected from multiple and distributed units in different operational conditions, which can introduce heterogeneity into the data. Part of such heterogeneity can be explained and isolated by the observable covariates, whose values and the way they can affect the item's reliability are known. However, some factors that may affect the item's reliability are typically unknown and lead to unobserved heterogeneity. These factors are categorized as unobserved covariates. In most reliability studies, the effect of unobserved covariates is neglected. This may lead to erroneous model selection for the time to failure of the item, as well as wrong conclusions and decisions. There is a lack of sufficient knowledge, theoretical background, and a systematic approach to model the unobserved covariate in reliability analysis. This paper aims to present a framework for reliability analysis in the presence of unobserved and observed covariates. The unobserved covariates will be analyzed using frailty models (Such as Mixed Proportional Hazard).A case will illustrate the application of the framework..","PeriodicalId":395350,"journal":{"name":"International Journal of Reliability, Risk and Safety: Theory and Application","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115248101","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

The Effect of Momentum Loss on Detonation Failure at Very Low Activation Energy 极低活化能下动量损失对爆轰破坏的影响

International Journal of Reliability, Risk and Safety: Theory and Application Pub Date : 2021-12-01 DOI: 10.30699/ijrrs.4.2.5

H. Karimaei, M. Sabzpooshani

{"title":"The Effect of Momentum Loss on Detonation Failure at Very Low Activation Energy","authors":"H. Karimaei, M. Sabzpooshani","doi":"10.30699/ijrrs.4.2.5","DOIUrl":"https://doi.org/10.30699/ijrrs.4.2.5","url":null,"abstract":"In this paper, the behavior of detonation waves in a non-ideal environment has been studied. Modeling of detonation has been performed based on one-dimensional Euler equations (momentum conservation) by considering friction as the momentum loss source term in the equation with a single-step Arrhenius law as the chemical kinetics model. Piecewise parabolic method(PPM) has been used to simulate the flow and solve the Euler equations. The shock front conservative tracking algorithm was used to have the finer mesh (Adaptive mesh refinement AMR) at the wave front location. The non-ideal environment is an environment in which external factors, such as friction, cause the detonation behavior to deviate from the ideal behavior. Therefore, the innovation of the present work is modeling detonation in these non-ideal conditions for mixtures with very low activation energy to detect its failure mechanism. The effect of momentum loss on the detonation behavior has been parametrically studied at very low activation energy (in which the detonation behavior is completely regular, here, 8). Depending on the level of mixture activation energy, the detonation has its failure mechanism. It is concluded that the failure mechanisms of the detonation in this study are the mechanisms of pressure drop and chemical reaction rate reduction. The un-burnt packet mechanism is not involved in it. The detonation wave, regardless of the amount of mixture activation energy, fails anyway as the momentum loss exceeds a critical limit.","PeriodicalId":395350,"journal":{"name":"International Journal of Reliability, Risk and Safety: Theory and Application","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131745717","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

Reliability and Uncertainty Determination of a Combined Heat and Power in Microgrid Systems 微电网热电联产系统可靠性与不确定度的确定

International Journal of Reliability, Risk and Safety: Theory and Application Pub Date : 2021-12-01 DOI: 10.30699/ijrrs.4.2.12

M. Mohseni

{"title":"Reliability and Uncertainty Determination of a Combined Heat and Power in Microgrid Systems","authors":"M. Mohseni","doi":"10.30699/ijrrs.4.2.12","DOIUrl":"https://doi.org/10.30699/ijrrs.4.2.12","url":null,"abstract":"Today, due to the increase in energy consumption and the increasing use of distributed generation units (DG) such as CHP and fuel cell (FC) units in microgrids, it is necessary to use them in the best possible conditions. The use of distributed generation units, which are mainly installed in small dimensions and on the load side of the distribution network, can provide other benefits, including reducing power transmission losses, increasing production efficiency, and increasing reliability to bring the meantime, the use of electricity and heat simultaneous production units, which are among the most widely used distributed production units, has improved the efficiency of energy production to a great extent by producing electricity and heat simultaneously, thus reducing the costs of energy failure. Therefore, in this paper, the goal is to reduce the cost of production and the cost of lack of energy supply and increase the reliability of the system. In this paper, the working modes of the sample microgrid are evaluated, and finally, the optimization of a multi-objective function, which has goals such as the economical production of each of the distributed production sources, the minimization of the cost of providing the electric and thermal energy of the microgrid, the minimization losses of electrical and thermal energy, load response program and energy storage program. The results of optimal planning of the capacity and number of co-generation units of electricity and heat under different conditions and states show the great effect of using co-generation units of electricity and heat in reducing unsupplied energy and increasing the reliability of the system.","PeriodicalId":395350,"journal":{"name":"International Journal of Reliability, Risk and Safety: Theory and Application","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116113778","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

Prediction of Failure Time and Remaining Useful Life in Aviation Systems: Predictors, models, and challenges 航空系统失效时间和剩余使用寿命预测:预测因子、模型和挑战

International Journal of Reliability, Risk and Safety: Theory and Application Pub Date : 2021-12-01 DOI: 10.30699/ijrrs.4.2.11

M. Babaee, J. Gheidar-Kheljani, M. Khazaee, M. Karbasian

{"title":"Prediction of Failure Time and Remaining Useful Life in Aviation Systems: Predictors, models, and challenges","authors":"M. Babaee, J. Gheidar-Kheljani, M. Khazaee, M. Karbasian","doi":"10.30699/ijrrs.4.2.11","DOIUrl":"https://doi.org/10.30699/ijrrs.4.2.11","url":null,"abstract":"In many important industries, such as aerial transportation, offshore wind turbine (OWT) structures, and nuclear power plants that reached or are near the end of their useful life, the structural conditions for continued usage are acceptable. Thus, safe continued operation with required modifications and assessment is more cost-effective than replacing them with a new system. To achieve this goal, many studies have been performed on predicting failure time and remaining useful life, especially in systems that require a very high level of reliability. The present review investigates the articles that predict the remaining useful life or failure time in aviation systems, from three perspectives: 1. Methods and algorithms, especially Machine Learning algorithms, which are growing in recent years in the field of Prognosis and Health Management. 2. Historical predictors such as working life history, environmental conditions, mechanical loads, failure records, asset age, maintenance information, or sensor variables and indicators that can be continuously controlled in each system, such as noise, temperature, vibration, and pressure.3. Challenges of researches on prediction of the failure time of flying systems. The literature assessment in this field shows that using diagnostic and prognostic outputs to identify possible defects and their origin, checking the system's health, and predicting the remaining useful life (RUL) is increasing due to market needs.","PeriodicalId":395350,"journal":{"name":"International Journal of Reliability, Risk and Safety: Theory and Application","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116286229","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: 1

Investigation of the Natural Circulation FlowMap in NuScale Small Modular Reactor NuScale小型模块化反应器自然循环流程图的研究

International Journal of Reliability, Risk and Safety: Theory and Application Pub Date : 2021-01-01 DOI: 10.30699/ijrrs.4.1.12

S. Hosseini, R. Akbari, A. Shirani, Francesco Dandamp Auria

{"title":"Investigation of the Natural Circulation FlowMap in NuScale Small Modular Reactor","authors":"S. Hosseini, R. Akbari, A. Shirani, Francesco Dandamp Auria","doi":"10.30699/ijrrs.4.1.12","DOIUrl":"https://doi.org/10.30699/ijrrs.4.1.12","url":null,"abstract":"Natural Circulation (NC) is an important mechanism in several industrial systems, and knowledge of its behavior is of interest to nuclear reactor design, operation and safety. The main safety issue in present nuclear reactors is to ensure the sufficient removal of decay heat during accidents. Recently, Small Modular Reactors (SMRs) have increasingly received a lot of positive attention and even several types of these reactors are in different stages of design and construction. Some of these SMRs, such as NuScale, are designed to operate in full NC mode as the main mechanism of the primary coolant drive force for heat removal from the reactor core during normal operation. The present study deals with the Natural Circulation Flow Map (NCFM) investigation in the NuScale reactor as one of the SMRs that operate in full NC mode. At first, NuScale reactor elements are modeled with RELAP5 thermal-hydraulic code. Then, after the verification of the steady-state modeling, the operational point of the NuScale reactor is indicated in NCFM that is based on the database of different PWR simulators (gathered from the experimental test facilities). The evaluation of Natural Circulation Performance (NCP) of this reactor has proved the good design of NCP during normal operation in comparing typical PWRs operations in high power cases.","PeriodicalId":395350,"journal":{"name":"International Journal of Reliability, Risk and Safety: Theory and Application","volume":"164 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114584546","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

Could the Bunce field Catastrophe Have Been Prevented Using an Intelligent Decision-Making System? 使用智能决策系统可以避免邦斯场灾难吗?

International Journal of Reliability, Risk and Safety: Theory and Application Pub Date : 2021-01-01 DOI: 10.30699/ijrrs.4.1.10

D. Sanders, Favour Ikwan, G. Tewkesbury

引用次数: 0

Performance Analysis of Complex Series Parallel Computer Network with Transparent Bridge Using Copula Distribution 基于Copula分布的透明桥复串并联计算机网络性能分析

International Journal of Reliability, Risk and Safety: Theory and Application Pub Date : 2021-01-01 DOI: 10.30699/ijrrs.4.1.7

M. Isa, M. Abubakar, Kabiru H. Ibrahim, I. Yusuf, Ismail Tukur

{"title":"Performance Analysis of Complex Series Parallel Computer Network with Transparent Bridge Using Copula Distribution","authors":"M. Isa, M. Abubakar, Kabiru H. Ibrahim, I. Yusuf, Ismail Tukur","doi":"10.30699/ijrrs.4.1.7","DOIUrl":"https://doi.org/10.30699/ijrrs.4.1.7","url":null,"abstract":"A network bridge is a computer networking device that creates a single aggregate network from multiple communication network or network segments. One of the type of network bridge is transparent bridge saddle with responsibility of checking incoming network traffic to identify media access control addresses. In this present research work on series parallel computer network performance, availability and cost analysis of complex computer network was considered to focus on a network that has four subsystems A, B, C and D and all the subsystems are arranged in series-parallel, subsystem A and B are working on 1-out-of-2: G and 2-out-of-3: F policy respectively, C subsystem behaved as a bridge with one unit and D subsystem has five units and are working in 3-out-of-5: G scheme. The system has two types of failure, degraded (partial failure) or complete failed states. The system was analyzed using supplementary variables techniques and Laplace transform, general distribution and copula family were employed to restore the partial failure and complete failure states. Computed results have been highlighted by the means of tables and graphs to investigate the performance of computer network. The result has shown that computer network with transparent bridge will be more reliable to filter incoming frame and forward it to media access control (MAC).","PeriodicalId":395350,"journal":{"name":"International Journal of Reliability, Risk and Safety: Theory and Application","volume":"73 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116025855","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

Identification of Size and Location of Bearing Damage via Deep Learning 基于深度学习的轴承损伤大小和位置识别

International Journal of Reliability, Risk and Safety: Theory and Application Pub Date : 2021-01-01 DOI: 10.30699/ijrrs.4.1.9

M. Farsi

引用次数: 1

Performance Analysis of K out of N Reverse Osmosis (RO) system in the treatment of wastewater using RAMD analysis 用RAMD分析反渗透(RO)系统处理废水中K - out - N的性能

International Journal of Reliability, Risk and Safety: Theory and Application Pub Date : 2021-01-01 DOI: 10.30699/ijrrs.4.1.11

A. Maihulla, I. Yusuf, S. Bala

引用次数: 0

A Continuum Damage Mechanics Approach for Reliability Analysis of Composite Laminates Containing a Central Circular Hole 含中心圆孔复合材料层合板可靠性分析的连续损伤力学方法

International Journal of Reliability, Risk and Safety: Theory and Application Pub Date : 2021-01-01 DOI: 10.30699/ijrrs.4.1.4

P. Gholami, M. A. Kouchakzadeh, M. Farsi

{"title":"A Continuum Damage Mechanics Approach for Reliability Analysis of Composite Laminates Containing a Central Circular Hole","authors":"P. Gholami, M. A. Kouchakzadeh, M. Farsi","doi":"10.30699/ijrrs.4.1.4","DOIUrl":"https://doi.org/10.30699/ijrrs.4.1.4","url":null,"abstract":"This paper discusses the topic of probabilistic analysis of composite laminates rectangular plates containing a central circular hole under static tensile load. First, According to the continuum damage mechanics (CDM) approach, structural analysis models, the definition of damage and the treatment of random variables will be explored. Then, the matrix cracking and fiber/matrix debonding damage is modeled and the material constitutive relationships are implemented in the ABAQUS software by the subroutine. The probabilistic methods, first order reliability method (FORM) and second order reliability method (SORM) have been used to analyze the composite plates’ system failure probability. The failure functions and random variables have been obtained according to the CDM approach. Issues arising out of the use of composite material structures, in applications, due to non-homogeneity and anisotropic characteristics, and manufacturing defects will be highlighted, and uncertainties related to the material properties, loads, and boundary conditions will be discussed through examples. It is shown that the scatter in parameter values has a significant effect on damage development in the model.","PeriodicalId":395350,"journal":{"name":"International Journal of Reliability, Risk and Safety: Theory and Application","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132035159","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