Eksploatacja I Niezawodnosc-Maintenance and Reliability最新文献_第6页

Integrated operation and maintenance optimization for high-speed train fleets considering passenger flow 考虑客流的高速列车机队综合运维优化

IF 2.5 3区工程技术

Eksploatacja I Niezawodnosc-Maintenance and Reliability Pub Date : 2022-04-15 DOI: 10.17531/ein.2022.2.11

Jiankun Liu, Zuhua Jiang, Hongming Zhou

引用次数: 2

Investigation of the influence of hydraulic oil temperature on the variable-speed pump performance 液压油温度对变速泵性能影响的研究

IF 2.5 3区工程技术

Eksploatacja I Niezawodnosc-Maintenance and Reliability Pub Date : 2022-04-09 DOI: 10.17531/ein.2022.2.10

Łukasz Stawiński, A. Kosucki, Maciej Cebulak, Adrian Górniak vel Górski, Mikołaj Grala

{"title":"Investigation of the influence of hydraulic oil temperature on the variable-speed pump performance","authors":"Łukasz Stawiński, A. Kosucki, Maciej Cebulak, Adrian Górniak vel Górski, Mikołaj Grala","doi":"10.17531/ein.2022.2.10","DOIUrl":"https://doi.org/10.17531/ein.2022.2.10","url":null,"abstract":"This paper describes investigation on the influence of hydraulic oil temperature on the\u0000performance of a hydraulic pump. The aim of the research is to determine changes in\u0000volumetric efficiency of the pump in the form of maps of operation at different temperatures of the hydraulic oil, in conditions of variable speed and pressure. The described tests were carried out on an experimental stand with a hydraulic fixed-displacement gear pump controlled by a servo motor. Based on the signals from the sensors processed with the LabVIEW program, maps of the hydraulic pump operation were drown in a wide range of speeds and temperatures. The paper presents the results of the research and based on this the conclusions regarding the main aim of the research and others that were observed during the measurements were presented. The most important conclusion from the study shows that the temperature-dependent characteristics provide users with a significant amount of information such as operating conditions that will ensure a high level of efficiency.","PeriodicalId":50549,"journal":{"name":"Eksploatacja I Niezawodnosc-Maintenance and Reliability","volume":"7 1","pages":""},"PeriodicalIF":2.5,"publicationDate":"2022-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76286282","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 6

Defensive strategy optimization of consecutive-k-out-of-n systems under deterministic external risks 确定性外部风险下连续k / n系统的防御策略优化

IF 2.5 3区工程技术

Eksploatacja I Niezawodnosc-Maintenance and Reliability Pub Date : 2022-04-09 DOI: 10.17531/ein.2022.2.12

Jiangbin Zhao, Zaoyan Zhang, Tianbo Xu, Xian-gang Cao, Qiyu Wang, Zhiqiang Cai

{"title":"Defensive strategy optimization of consecutive-k-out-of-n systems under deterministic external risks","authors":"Jiangbin Zhao, Zaoyan Zhang, Tianbo Xu, Xian-gang Cao, Qiyu Wang, Zhiqiang Cai","doi":"10.17531/ein.2022.2.12","DOIUrl":"https://doi.org/10.17531/ein.2022.2.12","url":null,"abstract":"Consecutive-k-out-of-n (Con/k/n) system, a reconfigurable system, can improve the system performance by adjusting the redundancy and assignment of components. This paper aims to determine the optimal defensive strategy of Con/k/n systems under external risks. The defensive capability of Con/k/n systems is evaluated based on real-time system reliability, and a defensive importance measure (DIM) is constructed to optimize components’ redundancy locally. To solve the proposed optimization model effectively, a DIM-based genetic algorithm (DIGA) is developed by integrating the advantages of DIM’s local search with the global search ability of the classical genetic algorithm (CGA). The numerical experiment under 36 scenarios illustrates that DIGA is more effective than CGA verified by average defensive capability, robustness, and convergence generations. Moreover, the redundancy distribution analysis of Con/k/5 systems in the optimal defensive strategy shows that the redundancy of F(G) systems is in a spaced (continuous) way under spacing k-1 risk or continuous k risk.","PeriodicalId":50549,"journal":{"name":"Eksploatacja I Niezawodnosc-Maintenance and Reliability","volume":"9 1","pages":""},"PeriodicalIF":2.5,"publicationDate":"2022-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86930493","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Dynamic reliability evaluation of buried corroded pipeline under rockfall impact 岩崩冲击下埋地腐蚀管道动态可靠性评价

IF 2.5 3区工程技术

Eksploatacja I Niezawodnosc-Maintenance and Reliability Pub Date : 2022-04-04 DOI: 10.17531/ein.2022.2.9

Yifei Wang, Mingjiang Xie, Chunya Su

引用次数: 1

Thermal strength analysis of a steel bolted connection under bolt loss conditions 螺栓损失条件下钢螺栓连接的热强度分析

IF 2.5 3区工程技术

Eksploatacja I Niezawodnosc-Maintenance and Reliability Pub Date : 2022-03-15 DOI: 10.17531/ein.2022.2.8

R. Grzejda

引用次数: 11

Analysis of the influence of hydraulic fluid quality on external gear pump performance 液压液质量对外啮合齿轮泵性能的影响分析

IF 2.5 3区工程技术

Eksploatacja I Niezawodnosc-Maintenance and Reliability Pub Date : 2022-03-15 DOI: 10.17531/ein.2022.2.7

Borivoj Novaković, L. Radovanović, Ninoslav Zuber, D. Radosav, L. Đorđević, M. Kavalić

{"title":"Analysis of the influence of hydraulic fluid quality on external gear pump performance","authors":"Borivoj Novaković, L. Radovanović, Ninoslav Zuber, D. Radosav, L. Đorđević, M. Kavalić","doi":"10.17531/ein.2022.2.7","DOIUrl":"https://doi.org/10.17531/ein.2022.2.7","url":null,"abstract":"The basis of every hydraulic system is based on energy transformations, which are realized\u0000through hydraulic working fluid. Hydraulic oils are certainly subject to changes within their\u0000structure, meaning the basic characteristics and parameters of hydraulic oil, such as density, viscosity, humidity. The oils that are exploited are exposed to the process of degradation, which largely leads to significantly poorer quality of hydraulic fluid. The paper deals with the influence of changes in the characteristics of the hydraulic fluid on the hydraulic operating parameters of the gear pump installed on the hydraulic press. The parameters refer to pressure, flow, and temperature, as well as the quality of hydraulic oil, which affects the volumetric efficiency of the pump, and the results presented in the conclusion are based on the measured values of parameters before and after corrective measures. The control of parameters aims to increase the efficiency and reliability of the hydraulic system, a way of modern detection of deviations of parameters from standard, required values.","PeriodicalId":50549,"journal":{"name":"Eksploatacja I Niezawodnosc-Maintenance and Reliability","volume":"1 1","pages":""},"PeriodicalIF":2.5,"publicationDate":"2022-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90329753","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Predicting IoT failures with Bayesian workflow 用贝叶斯工作流预测物联网故障

IF 2.5 3区工程技术

Eksploatacja I Niezawodnosc-Maintenance and Reliability Pub Date : 2022-03-12 DOI: 10.17531/ein.2022.2.6

J. Baranowski

{"title":"Predicting IoT failures with Bayesian workflow","authors":"J. Baranowski","doi":"10.17531/ein.2022.2.6","DOIUrl":"https://doi.org/10.17531/ein.2022.2.6","url":null,"abstract":"IoT networks are so voluminous that they cannot be treated as individual devices, but as\u0000populations. Main aim of the paper is to create a comprehensive method for predicting\u0000failures taking device variance into consideration. We propose using data fusion of happenstance observations (resets and failures) to better estimate device parameters. We propose using methods of population analysis in Bayesian statistics to estimate failure times investigating only a part of the population. For this purpose, we use multilevel hierarchical Bayesian model and provide it with post stratification. We propose model assumptions, construct the model and evaluate it, and perform computations using Hamiltonian Monte Carlo. This method is known as the Bayesian workflow. We have analyzed three different models showing that, in case of small device variance, it can be ignored, or at least compensated, while significant differences require hierarchical modeling. We also show that hierarchical model shows significant robustness to a small amount of data. We have shown attractiveness of\u0000Bayesian approach to modeling failures of IoT devices. Ability to diagnose and tune models, and assure their computational fidelity is a great advantage of Bayesian workflow.","PeriodicalId":50549,"journal":{"name":"Eksploatacja I Niezawodnosc-Maintenance and Reliability","volume":"21 1","pages":""},"PeriodicalIF":2.5,"publicationDate":"2022-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86750315","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

A machine learning method for soil conditioning automated decision-making of EPBM: hybrid GBDT and Random Forest Algorithm 土壤调节自动决策的机器学习方法:混合GBDT和随机森林算法

IF 2.5 3区工程技术

Eksploatacja I Niezawodnosc-Maintenance and Reliability Pub Date : 2022-03-07 DOI: 10.17531/ein.2022.2.5

Lin Lin, Hao Guo, Yancheng Lv, Jie Liu, Chang-sheng Tong, Shuqin Yang

{"title":"A machine learning method for soil conditioning automated decision-making of EPBM: hybrid GBDT and Random Forest Algorithm","authors":"Lin Lin, Hao Guo, Yancheng Lv, Jie Liu, Chang-sheng Tong, Shuqin Yang","doi":"10.17531/ein.2022.2.5","DOIUrl":"https://doi.org/10.17531/ein.2022.2.5","url":null,"abstract":"There lacks an automated decision-making method for soil conditioning of EPBM with high\u0000accuracy and efficiency that is applicable to changeable geological conditions and takes\u0000drive parameters into consideration. A hybrid method of Gradient Boosting Decision Tree\u0000(GBDT) and random forest algorithm to make decisions on soil conditioning using foam is\u0000proposed in this paper to realize automated decision-making. Relevant parameters include\u0000decision parameters (geological parameters and drive parameters) and target parameters\u0000(dosage of foam). GBDT, an efficient algorithm based on decision tree, is used to determine\u0000the weights of geological parameters, forming 3 parameters sets. Then 3 decision-making\u0000models are established using random forest, an algorithm with high accuracy based on decision tree. The optimal model is obtained by Bayesian optimization. It proves that the model has obvious advantages in accuracy compared with other methods. The model can realize real-time decision-making with high accuracy under changeable geological conditions and reduce the experiment cost.","PeriodicalId":50549,"journal":{"name":"Eksploatacja I Niezawodnosc-Maintenance and Reliability","volume":"14 1","pages":""},"PeriodicalIF":2.5,"publicationDate":"2022-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88171805","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

The impact of alcohol admixture with gasoline on carbon build-up and fuel injectors performance 乙醇与汽油混合对积碳和喷油器性能的影响

IF 2.5 3区工程技术

Eksploatacja I Niezawodnosc-Maintenance and Reliability Pub Date : 2022-03-02 DOI: 10.17531/ein.2022.2.4

Z. Stępień, I. Pielecha, W. Cieślik, F. Szwajca

{"title":"The impact of alcohol admixture with gasoline on carbon build-up and fuel injectors performance","authors":"Z. Stępień, I. Pielecha, W. Cieślik, F. Szwajca","doi":"10.17531/ein.2022.2.4","DOIUrl":"https://doi.org/10.17531/ein.2022.2.4","url":null,"abstract":"The operating conditions of injectors in spark ignition engines with direct fuel injection\u0000make them susceptible to coking, which leads to a reduced quality of fuel atomization. This can be observed by a drop in performance and an increase in exhaust emissions, especially particulate matter. One effective method of reducing injector coking is by using detergentdispersing gasoline additives. The article describes the effect of using an admixture with a varied alcohol content on the quantitative and qualitative fuel atomization indicators. The research consisted of a 48-hour engine test, done in accordance with the CEC F-113-KC procedure (CEC-F-113 test). After each test cycle, the injectors underwent optical tests with the use of an isochoric chamber. The spray penetration and surface area were analyzed at a set of different fuel injection parameter values. The research performed resulted in determining the influence of each tested admixture on the change of injection time and on the geometric indicators of the fuel spray. The obtained characteristics of the engine in operation and conducted stationary tests enabled the operational evaluation of the impact an alcohol admixture with gasoline fuels had on key engine parameters.","PeriodicalId":50549,"journal":{"name":"Eksploatacja I Niezawodnosc-Maintenance and Reliability","volume":"128 1","pages":""},"PeriodicalIF":2.5,"publicationDate":"2022-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90712792","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Dynamic load analysis of the connecting bolts in a universal joint 万向节连接螺栓的动载荷分析

IF 2.5 3区工程技术

Eksploatacja I Niezawodnosc-Maintenance and Reliability Pub Date : 2022-02-26 DOI: 10.17531/ein.2022.2.3

Yuchen An, Jing Liu, Z. Li

引用次数: 0