{"title":"Accelerated degradation analysis based on a random-effect Wiener process with one-order autoregressive errors","authors":"Junxing Li, Zhihua Wang, Chengrui Liu, M. Qiu","doi":"10.17531/ein.2019.2.8","DOIUrl":"https://doi.org/10.17531/ein.2019.2.8","url":null,"abstract":"","PeriodicalId":309533,"journal":{"name":"Ekspolatacja i Niezawodnosc - Maintenance and Reliability","volume":"92 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123545039","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}
Cher Ming Tang, Udit Narula, Luhua Lai, S. Pandey, Jung-Hua Tung, Chung-Yi Li
Haemodialysis machines are one of the important medical equipment which is used to treat renal failures and minimum downtimes are thus essential. Uninterrupted and constant use of these machines in hospitals worldwide makes them vulnerable to failures if not maintained properly. Consequently, the maintenance cost for dialysis machine is high. A method to implement a cost effective maintenance strategy is demonstrated in this work. Root Cause Based Maintenance (RCBM) strategy is employed at the component level to optimize the Reliability Based Maintenance schedules derived from the existing maintenance and failure data. In order to minimize the average cost of maintenance for Haemodialysis machines and ensure their high operational availability, a Cost-Model is derived, and Genetic Algorithm is employed for optimization in this work. The application of RCBM strategy results in cost saving of about 60% of the cost incurred using current maintenance scheme. Statistical and optimization calculations are performed using Reliasoft’s Weibull++ and MATLAB tools respectively.
{"title":"Optimal maintenance strategy on medical instruments used for haemodialysis process","authors":"Cher Ming Tang, Udit Narula, Luhua Lai, S. Pandey, Jung-Hua Tung, Chung-Yi Li","doi":"10.17531/ein.2019.2.17","DOIUrl":"https://doi.org/10.17531/ein.2019.2.17","url":null,"abstract":"Haemodialysis machines are one of the important medical equipment which is used to treat renal failures and minimum downtimes are thus essential. Uninterrupted and constant use of these machines in hospitals worldwide makes them vulnerable to failures if not maintained properly. Consequently, the maintenance cost for dialysis machine is high. A method to implement a cost effective maintenance strategy is demonstrated in this work. Root Cause Based Maintenance (RCBM) strategy is employed at the component level to optimize the Reliability Based Maintenance schedules derived from the existing maintenance and failure data. In order to minimize the average cost of maintenance for Haemodialysis machines and ensure their high operational availability, a Cost-Model is derived, and Genetic Algorithm is employed for optimization in this work. The application of RCBM strategy results in cost saving of about 60% of the cost incurred using current maintenance scheme. Statistical and optimization calculations are performed using Reliasoft’s Weibull++ and MATLAB tools respectively.","PeriodicalId":309533,"journal":{"name":"Ekspolatacja i Niezawodnosc - Maintenance and Reliability","volume":"6 7","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114034914","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}
{"title":"Optimization method of bevel gear reliability based on genetic algorithm and discrete element","authors":"Kangkang Sun, Guoqiang Wang, Yanpeng Lu","doi":"10.17531/ein.2019.2.2","DOIUrl":"https://doi.org/10.17531/ein.2019.2.2","url":null,"abstract":"","PeriodicalId":309533,"journal":{"name":"Ekspolatacja i Niezawodnosc - Maintenance and Reliability","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132941092","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}
A. Gołaś, W. Ciesielka, K. Szopa, P. Zydroń, W. Bąchorek, M. Benesz, A. Kot, S. Moskwa
The paper is a result of a synergic cooperation of two academic teams, i.e. power engineering and mechanical teams, and a distribution system operator. A real 15 kV overhead line exposed to a catastrophic load of ice and rime was analyzed and three solutions to improve the reliability of the tested object in such conditions were examined. Authors considered: shortening the length of the line spans, heating the main line with increased current and rebuilding the overhead line to a cable line. The researches worked out a FEM model taking into account the newest normatives, simulated the model, experimentally increased the load on the real line with measured wire temperature, and performed multi-variant calculations to determine indicators of reliability, i.e. SAIDI and SAIFI. The analyses were followed by conclusions thanks to which the reliability of power lines exposed to catastrophic icing could be increased. These inferences should be considered and applied by all distribution system operators in Poland.
{"title":"Analysis of the possibilities to improve the reliability of a 15 kV overhead line exposed to catastrophic icing in Poland","authors":"A. Gołaś, W. Ciesielka, K. Szopa, P. Zydroń, W. Bąchorek, M. Benesz, A. Kot, S. Moskwa","doi":"10.17531/ein.2019.2.13","DOIUrl":"https://doi.org/10.17531/ein.2019.2.13","url":null,"abstract":"The paper is a result of a synergic cooperation of two academic teams, i.e. power engineering and mechanical teams, and a distribution system operator. A real 15 kV overhead line exposed to a catastrophic load of ice and rime was analyzed and three solutions to improve the reliability of the tested object in such conditions were examined. Authors considered: shortening the length of the line spans, heating the main line with increased current and rebuilding the overhead line to a cable line. The researches worked out a FEM model taking into account the newest normatives, simulated the model, experimentally increased the load on the real line with measured wire temperature, and performed multi-variant calculations to determine indicators of reliability, i.e. SAIDI and SAIFI. The analyses were followed by conclusions thanks to which the reliability of power lines exposed to catastrophic icing could be increased. These inferences should be considered and applied by all distribution system operators in Poland.","PeriodicalId":309533,"journal":{"name":"Ekspolatacja i Niezawodnosc - Maintenance and Reliability","volume":"305 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133765757","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}
{"title":"ANN-based failure modeling of classes of aircraft engine components using radial basis functions","authors":"A. Al-Garni, W. Abdelrahman, A. Abdallah","doi":"10.17531/ein.2019.2.16","DOIUrl":"https://doi.org/10.17531/ein.2019.2.16","url":null,"abstract":"","PeriodicalId":309533,"journal":{"name":"Ekspolatacja i Niezawodnosc - Maintenance and Reliability","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133377849","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}
{"title":"Criterion for crack initiation from notch located at the interface of bi-material structure","authors":"G. Mieczkowski","doi":"10.17531/ein.2019.2.15","DOIUrl":"https://doi.org/10.17531/ein.2019.2.15","url":null,"abstract":"","PeriodicalId":309533,"journal":{"name":"Ekspolatacja i Niezawodnosc - Maintenance and Reliability","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129754991","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}
{"title":"Semi-Markov system model for minimal repair maintenance","authors":"L. Knopik, K. Migawa","doi":"10.17531/ein.2019.2.9","DOIUrl":"https://doi.org/10.17531/ein.2019.2.9","url":null,"abstract":"","PeriodicalId":309533,"journal":{"name":"Ekspolatacja i Niezawodnosc - Maintenance and Reliability","volume":"93 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132536124","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}
B. Karwat, R. Machnik, J. Niedźwiedzki, Magdalena Nogaj, Piotr Rubacha, Emil Stańczyk
(*) Tekst artykułu w polskiej wersji językowej dostępny w elektronicznym wydaniu kwartalnika na stronie www.ein.org.pl KArwAT B, MAchniK r, niedźwiedzKi J, nogAJ M, ruBAchA P, STAńczyK e. calibration of bulk material model in discrete element Method on example of perlite d18-dn. eksploatacja i niezawodnosc – Maintenance and reliability 2019; 21 (2): 351–357, http://dx.doi. org/10.17531/ein.2019.2.20.
{"title":"Calibration of bulk material model in Discrete Element Method on example of perlite D18-D","authors":"B. Karwat, R. Machnik, J. Niedźwiedzki, Magdalena Nogaj, Piotr Rubacha, Emil Stańczyk","doi":"10.17531/ein.2019.2.20","DOIUrl":"https://doi.org/10.17531/ein.2019.2.20","url":null,"abstract":"(*) Tekst artykułu w polskiej wersji językowej dostępny w elektronicznym wydaniu kwartalnika na stronie www.ein.org.pl KArwAT B, MAchniK r, niedźwiedzKi J, nogAJ M, ruBAchA P, STAńczyK e. calibration of bulk material model in discrete element Method on example of perlite d18-dn. eksploatacja i niezawodnosc – Maintenance and reliability 2019; 21 (2): 351–357, http://dx.doi. org/10.17531/ein.2019.2.20.","PeriodicalId":309533,"journal":{"name":"Ekspolatacja i Niezawodnosc - Maintenance and Reliability","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116837628","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}
T. Khaniyev, M. B. Baskir, F. Gokpinar, F. Mirzayev
Fuzzy sets are useful and effective tools to model the uncertainty problem in real-life applications. The most common fuzzy sets used in these applications are known as type-1 fuzzy sets (T1FSs). Since the membership degrees of T1FSs are crisp numbers, recently, type-2 fuzzy sets (T2FSs) are also preferred by many researchers to express uncertainty in T1FSs. Zadeh [11] introduced T2FS as an extension version of the conventional T1FS. Some important studies about T2FSs can be given as Aisbett et al. [1], Hamrawi [3], Karnik and Mendel [5], Wu and Mendel [9]. Furthermore, some applications of T2FSs can be found in Tao et al. [6], Türkşen [7], Wagenkneckt and Hartmann [8], Wu and Mendel [10]. Also, basic operations on T2FSs were studied by Blewitt et.al. [2], Karnik and Mendel [5]. However, type-2 fuzzy numbers (T2FNs) are required to make theoretical inference about modelling uncertainty. In the literature, limited number of studies can be found related to the operators on T2FNs, e.g., Kardan et al. [4]. Mostly, it is difficult to use these operators on T2FNs due to the computational complexity of T2FSs. This study introduces practical and innovative solutions for arithmetical operations on T2FN using the (α, β)-cut definition. Thus, type-2 fuzzy parameter-based distributions and reliability functions are proposed with regards to their monotonicity. Therefore, we present a novel perspective to perform various arithmetical operators on type-2 fuzzy numbers. The basis of this perspective is structured by an (α, β)-cut definition. This definition is derived from the type-1 operations on three type-1 membership functions (lower, upper and type-1 membership functions) of T2FN. Some operations (such as sum, subtraction, multiplication, division) for T2FNs are determined using the (α, β)-cuts. Then, the membership functions of T2FNs are structured by the (α, β)-cuts. Besides, we utilize this (α, β)-cut definition to form fuzzy function of T2FN under some assumptions. Finally, we give some applications of probability distributions when some parameters of the distributions are the T2FNs. This paper is organized as follows: Section 2 provides mathematical background of type-2 fuzzy sets and numbers, (α, β)-cut definition of T2FN, fuzzy function of T2FN with its monotonicity. The applications based on the statistical distributions and reliability functions of T2FN are given in Section 3. Conclusion is drawn in Section 4.
在实际应用中，模糊集是建模不确定性问题的有效工具。在这些应用程序中使用的最常见的模糊集被称为1型模糊集(t1fs)。由于t1fs的隶属度是一个清晰的数字，近年来，许多研究者也倾向于用2型模糊集(type-2 fuzzy sets, t2fs)来表达t1fs中的不确定性。Zadeh[11]将T2FS作为传统T1FS的扩展版本引入。关于t2fs的重要研究有Aisbett et al. [1]， Hamrawi [3]， Karnik and Mendel [5]， Wu and Mendel[9]。此外，t2fs的一些应用可以在Tao et al. [6]， t rk en [7]， Wagenkneckt and Hartmann [8]， Wu and Mendel[10]中找到。此外，Blewitt等人还研究了t2fs的基本手术。[5]，卡尼克和孟德尔[5]。然而，需要2型模糊数(T2FNs)来对建模不确定性进行理论推断。在文献中，与T2FNs操作人员相关的研究数量有限，如Kardan等[10]。大多数情况下，由于T2FSs的计算复杂性，很难在T2FNs上使用这些算子。本文介绍了利用(α， β)切割定义对T2FN进行算术运算的实用和创新的解决方案。因此，根据其单调性，提出了基于类型-2模糊参数的分布和可靠性函数。因此，我们提出了一种新的视角来对2型模糊数进行各种算术运算。这个透视图的基础是由(α， β)切割定义构成的。这个定义来源于对T2FN的三个类型-1隶属函数(lower, upper和type-1隶属函数)的类型-1操作。t2fn的一些运算(如和、减、乘、除)是使用(α， β)-切来确定的。然后，利用(α， β)-切割构造T2FNs的隶属函数。此外，我们利用这个(α， β)切割定义，在一定的假设条件下，形成了T2FN的模糊函数。最后给出了概率分布的一些参数为T2FNs的应用。本文组织如下:第2节给出了2型模糊集与数的数学背景，T2FN的(α， β)切定义，T2FN的模糊函数及其单调性。第3节给出了基于T2FN统计分布和可靠性函数的应用。第四节得出结论。
{"title":"Statistical distributions and reliability functions with type-2 fuzzy parameters","authors":"T. Khaniyev, M. B. Baskir, F. Gokpinar, F. Mirzayev","doi":"10.17531/ein.2019.2.11","DOIUrl":"https://doi.org/10.17531/ein.2019.2.11","url":null,"abstract":"Fuzzy sets are useful and effective tools to model the uncertainty problem in real-life applications. The most common fuzzy sets used in these applications are known as type-1 fuzzy sets (T1FSs). Since the membership degrees of T1FSs are crisp numbers, recently, type-2 fuzzy sets (T2FSs) are also preferred by many researchers to express uncertainty in T1FSs. Zadeh [11] introduced T2FS as an extension version of the conventional T1FS. Some important studies about T2FSs can be given as Aisbett et al. [1], Hamrawi [3], Karnik and Mendel [5], Wu and Mendel [9]. Furthermore, some applications of T2FSs can be found in Tao et al. [6], Türkşen [7], Wagenkneckt and Hartmann [8], Wu and Mendel [10]. Also, basic operations on T2FSs were studied by Blewitt et.al. [2], Karnik and Mendel [5]. However, type-2 fuzzy numbers (T2FNs) are required to make theoretical inference about modelling uncertainty. In the literature, limited number of studies can be found related to the operators on T2FNs, e.g., Kardan et al. [4]. Mostly, it is difficult to use these operators on T2FNs due to the computational complexity of T2FSs. This study introduces practical and innovative solutions for arithmetical operations on T2FN using the (α, β)-cut definition. Thus, type-2 fuzzy parameter-based distributions and reliability functions are proposed with regards to their monotonicity. Therefore, we present a novel perspective to perform various arithmetical operators on type-2 fuzzy numbers. The basis of this perspective is structured by an (α, β)-cut definition. This definition is derived from the type-1 operations on three type-1 membership functions (lower, upper and type-1 membership functions) of T2FN. Some operations (such as sum, subtraction, multiplication, division) for T2FNs are determined using the (α, β)-cuts. Then, the membership functions of T2FNs are structured by the (α, β)-cuts. Besides, we utilize this (α, β)-cut definition to form fuzzy function of T2FN under some assumptions. Finally, we give some applications of probability distributions when some parameters of the distributions are the T2FNs. This paper is organized as follows: Section 2 provides mathematical background of type-2 fuzzy sets and numbers, (α, β)-cut definition of T2FN, fuzzy function of T2FN with its monotonicity. The applications based on the statistical distributions and reliability functions of T2FN are given in Section 3. Conclusion is drawn in Section 4.","PeriodicalId":309533,"journal":{"name":"Ekspolatacja i Niezawodnosc - Maintenance and Reliability","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129955240","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}
Kristina Kilikevičienė, J. Matijošius, Antanas Fursenko, A. Kilikevičius
The mandatory tests of resistance to hail is carried out in order to qualify solar cell modules according to standards (IEC 61215 and IEC 61646). The efficiency of modern photovoltaic systems decreases significantly, when the crystalline structure of solar cells is damaged as a result of climatic factors, such as wind, hail, etc., which are similar to mechanical-dynamic effects. This work presents a conducted research of efficiency and reliability of solar cells, simulating hail effects. A testbed was created specifically for carrying out experimental research. During the research, solar elements were exposed to impact, cyclic dynamic loads, with the frequency of revolutions of the balls simulating hail ranging from 5 to 20 Hz, the amplitude of the impact excitation acceleration of the solar cell up to 986 m / s2 and the force amplitude up to 1129 N. Experimental research results revealed the reliability of photovoltaic modules of different sizes during the simulation of hail. The proposed assessment methodology of hail effects can be successfully applied in studies of the influence of mechanical-dynamic effects of solar cells of different structures.
进行强制性抗冰雹测试是为了根据标准(IEC 61215和IEC 61646)对太阳能电池模块进行合格检验。当太阳能电池的晶体结构受到类似于机械动力效应的气候因素(如风、冰雹等)的破坏时，现代光伏系统的效率会显著降低。这项工作提出了太阳能电池的效率和可靠性的研究，模拟冰雹效应。专门为进行实验研究而建立了一个试验台。研究过程中，太阳能组件承受冲击、循环动载荷，模拟冰雹球的转数频率为5 ~ 20 Hz，太阳电池的冲击激励加速度幅值高达986 m / s2，力幅值高达1129 n。实验研究结果揭示了不同尺寸光伏组件在模拟冰雹过程中的可靠性。所提出的冰雹效应评价方法可成功地应用于不同结构太阳能电池力学动力效应影响的研究。
{"title":"Tests of hail simulation and research of the resulting impact on the structural reliability of solar cells","authors":"Kristina Kilikevičienė, J. Matijošius, Antanas Fursenko, A. Kilikevičius","doi":"10.17531/ein.2019.2.12","DOIUrl":"https://doi.org/10.17531/ein.2019.2.12","url":null,"abstract":"The mandatory tests of resistance to hail is carried out in order to qualify solar cell modules according to standards (IEC 61215 and IEC 61646). The efficiency of modern photovoltaic systems decreases significantly, when the crystalline structure of solar cells is damaged as a result of climatic factors, such as wind, hail, etc., which are similar to mechanical-dynamic effects. This work presents a conducted research of efficiency and reliability of solar cells, simulating hail effects. A testbed was created specifically for carrying out experimental research. During the research, solar elements were exposed to impact, cyclic dynamic loads, with the frequency of revolutions of the balls simulating hail ranging from 5 to 20 Hz, the amplitude of the impact excitation acceleration of the solar cell up to 986 m / s2 and the force amplitude up to 1129 N. Experimental research results revealed the reliability of photovoltaic modules of different sizes during the simulation of hail. The proposed assessment methodology of hail effects can be successfully applied in studies of the influence of mechanical-dynamic effects of solar cells of different structures.","PeriodicalId":309533,"journal":{"name":"Ekspolatacja i Niezawodnosc - Maintenance and Reliability","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129176017","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}
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