Ekspolatacja i Niezawodnosc - Maintenance and Reliability最新文献

{"title":"Effect of radial internal clearance on the fatigue life of the radial cylindrical roller bearing","authors":"A. Chudzik, B. Warda","doi":"10.17531/ein.2019.2.4","DOIUrl":"https://doi.org/10.17531/ein.2019.2.4","url":null,"abstract":"A material constant B bearing width C basic dynamic load rating D bearing outside diameter Dr roller diameter E Young’s modulus Fr radial load of the bearing INT integer function L fatigue life Lr roller length Qr resultant normal force in the roller‐main race contact St Stribeck’s constant Uz local displacement inside the bearing elements Z depth of occurrence of maximal von Mises stresses along the x axis Zr number of rollers in the bearing b half width of the contact c exponent in the equation determining the survival prob‐ ability d bearing bore diameter dbi diameter of the inner ring raceway dbo diameter of the outer ring raceway e Weibull slope g radial clearance in the bearing h exponent in the equation determining the survival prob‐ ability i inner raceway j number of roller l length of the roller‐main race contact area o outer raceway n number of pairs of loaded items rb radius of the main race rc roller chamfer u number of load cycles per one revolution δmax maximum elastic deformation δc total displacement of the bearing axis ν Poisson’s constant σ maximal von Mises stress occurring along the x axis Chudzik A, WArdA B. Effect of radial internal clearance on the fatigue life of the radial cylindrical roller bearing. Eksploatacja i Niezawodnosc – Maintenance and reliability 2019; 21 (2): 211–219, http://dx.doi.org/10.17531/ein.2019.2.4.","PeriodicalId":309533,"journal":{"name":"Ekspolatacja i Niezawodnosc - Maintenance and Reliability","volume":"25 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":"123300774","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":"Improving efficiency of horizontal ribbon mixer by optimizing its constructional and operational parameters","authors":"A. Marczuk, W. Misztal, P. Savinykh, Nikolay Turbanov, A. Isupov, D. Zyryanov","doi":"10.17531/ein.2019.2.5","DOIUrl":"https://doi.org/10.17531/ein.2019.2.5","url":null,"abstract":"The homogeneity of mixing various feed mixture ingredients and the reliability of mixers directly depend on the constructional features of mixing devices and operational parameters of their work. This article presents a theoretical underpinning for the structural (design) specifications of a horizontal ribbon auger mixer (blender) with regard to the fulfilment of the condition when the material is transported by auger tapes in different directions, ensuring the efficient mixing of the feed mixture ingredients and timely material unloading from the mixer tank (hopper). The performed optimization of the structural and operational specifications as a result of experimental studies has allowed to increase the reliability of the mixer and to determine the homogeneity coefficient of the finished product, which reaches its the highest value of 94.13% with the forward direction of rotation of the mixer movable operating elements, when mixing time is 13 minutes and when the tank load is 52.4% of its volume.","PeriodicalId":309533,"journal":{"name":"Ekspolatacja i Niezawodnosc - Maintenance and Reliability","volume":"25 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":"115062341","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":"Welding tendency for selected contact materials under different switching conditions","authors":"A. Książkiewicz, J. Janiszewski","doi":"10.17531/EIN.2019.2.7","DOIUrl":"https://doi.org/10.17531/EIN.2019.2.7","url":null,"abstract":"The flow of significant current through electric contacts may lead to contact welding. In a.c. circuits this phenomena is not only dependent on properties of contact material (i.e. resistance to welding) but on the phase in which current is switched on. Welding tendency for contact materials made from AgNi, AgCdO and AgSnO2 was evaluated based on selected phase at which make operation took place. The test circuit was protected by overcurrent apparatus to simulate real working environment. It is observed that welding tendency for the selected contact materials is contingent to current phase at which make operation is done.","PeriodicalId":309533,"journal":{"name":"Ekspolatacja i Niezawodnosc - Maintenance and Reliability","volume":"42 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":"124907258","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":"Availability analysis for a multi-component system with different k-out-of-n:G warm standby subsystems subject to suspended animation","authors":"Yu Wang, Linhan Guo, M. Wen, Yi Yang","doi":"10.17531/ein.2019.2.14","DOIUrl":"https://doi.org/10.17531/ein.2019.2.14","url":null,"abstract":"Industrial equipment or systems are usually constructed with kout-of-n:G subsystems in series to fulfill a specified function[14]. The k-out-of-n:G structure is a common type of redundancy used to improve the reliability and availability of engineering systems. A kout-of-n:G system refers to a system that is functional if and only if at least k out of n components within the system are functional[31]. Two types of components exist in the k-out-of-n:G system, which are acYu WAng Linhan guo Meilin Wen Yi YAng","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":"129045013","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":"Monitoring and maintenance of a gantry based on a wireless system for measurement and analysis of the vibration level","authors":"M. Sikora, K. Szczyrba, Ł. Wróbel, M. Michalak","doi":"10.17531/ein.2019.2.19","DOIUrl":"https://doi.org/10.17531/ein.2019.2.19","url":null,"abstract":"The paper describes a system for monitoring and diagnosing a gantry. The main goal of the system is to acquire, visualize and monitor vibration levels of the gantry crucial elements. The system is also equipped with a computing and analytical part which enables predictive maintenance related to the vibration level assessment. The system architecture can be used in other applications too, i.e. those which require a wireless network of vibration sensors to carry out diagnostic tasks.","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":"123924715","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":"Evaluation of applicability of dielectric constant in monitoring aging processes in engine oils","authors":"L. Gomółka, A. Augustynowicz","doi":"10.17531/ein.2019.2.1","DOIUrl":"https://doi.org/10.17531/ein.2019.2.1","url":null,"abstract":"In the era of developing technology, ICE forms the used sources applied to drive vehicles, machines and a variety of equipment. We can assume that despite its numerous drawbacks, ICE will remain to play the role of the dominant source of power for many years [9,12]. The lubrication system forms one of the most important systems in an engine, and a lubricating oil forms its integral part. In order to adequately verify the properties of oils during operation, there is a need to easily and accurately diagnose its quality. This fact leads to the need to adequately select a representative parameter by means of which it is possible to monitor changes occurring during its exploitation. Modern engine oils consist of various components and additives, by which a number of stringent operational requirements can be achieved and realized. Therefore, it is important to adopt and select such research methods and quantities that meet the requirements of a diagnostic parameter, can be applied to analyze the quality of the oil. The assessment of oil wear in an engine currently forms one of the most dynamically developing trends in research and is of interest to many scientific institutions [7]. This subject also forms the focus of interest of private companies operating vehicles due to the practical and economic outcomes that can be valuable to them [5,6]. All mechanisms or components of equipment are subjected to the processes of aging and wear so along with aging, engine oil changes its lubricating properties, which adversely affects the characteristics of the lubrication system. Heterogeneous conditions of vehicle and machine operaleszek gomółka andrzej auguSTynowicz","PeriodicalId":309533,"journal":{"name":"Ekspolatacja i Niezawodnosc - Maintenance and Reliability","volume":" 43","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120834176","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":"Innovative methods of neural reconstruction for tomographic images in maintenance of tank industrial reactors","authors":"T. Rymarczyk, G. Kłosowski","doi":"10.17531/ein.2019.2.10","DOIUrl":"https://doi.org/10.17531/ein.2019.2.10","url":null,"abstract":"Many chemical engineering products are created as a result of processes carried out using technological lines in which chemical reactors play a key role. A chemical reactor is a vessel adapted to carry out reactions taking place inside it. The purpose of industrial tank reactors is to ensure optimal economic parameters of chemical processes [18]. It can be achieved by the appropriate reactor design and by the skillful overlap of the three types of sub-processes occurring inside the reactor, namely the transfer of mass, momentum and heat. In this way, process control can be based on a dynamic selection of parameters such as: mixing intensity, temperature, pressure, substrate ratios and others. The presented research included reactors in which reactions take place between solid and liquid as well as gas and liquid. The tank reactor diagram is shown in Fig. 1. The first type of reaction concerns the crystallization of solids in a liquid environment. It covers industrial processes of synthesis and purification of solid substances and changes in particle properties. The reactors in which crystallization occurs are used in many branches of the economy, including: chemical, food [9], metallurgy and waste utilization [27]. One of the monitoring systems tasks of such processes is to provide precise information on the quantity, size and location of crystals formed in the liquid in real time. The second type of reaction relates to the gas phase and the liquid phase. Such processes type are used, inter alia, in the production of biogas. Physicochemical fermentation reactors are a key element of biogas installations. Methane fermentation of organic waste takes place inside these reactors. The correct operation of technical systems is one of the crucial conditions for obtaining an adequate level of reliability of industrial processes [10]. There are two main reasons to monitor the state of dynamic processes. The first one is the detection of impending failures [11] which RymARczyk T, kłosowski G. innovative methods of neural reconstruction for tomographic images in maintenance of tank industrial reactors. Eksploatacja i Niezawodnosc – maintenance and Reliability 2019; 21 (2): 261–267, http://dx.doi.org/10.17531/ein.2019.2.10.","PeriodicalId":309533,"journal":{"name":"Ekspolatacja i Niezawodnosc - Maintenance and Reliability","volume":"20 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":"127218120","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":"Maintenance management balanced scorecard approach for urban transport fleets","authors":"V. Macián, B. Tormos, J. Herrero","doi":"10.17531/ein.2019.2.6","DOIUrl":"https://doi.org/10.17531/ein.2019.2.6","url":null,"abstract":"Maintenance is one of the largest expenditures for the urban transport companies together with fuel (or energy) costs and drivers (personnel) [16], but is the most important one from the view of controllability, attending that fuel and labour costs are more externally driven (crude prices volatility, taxes, personnel policies and salaries, etc.). A proper maintenance policy, managerial processes and planning and optimization of maintenance decisions, scheduling and execution of work can lead to reduce costs, improve vehicle effectiveness, reliability and performance. Consequently, maintenance function is therefore vital for sustainable performance of any urban transport fleet. Attending the responsibility of ensuring that urban fleet achieves the expected performance, maintenance managers requires a tracking system for maintenance operations performance and results [3, 6, 20, 21]. Furthermore, it is in the interest of maintenance managers to know the relationship between the input of the maintenance process and the outcome in terms of total contribution to vehicle fleet performance and strategic objectives. The measurement of maintenance performance is indeed an essential requirement for any industry of today. This tracking action can be done through development and implementation of a proper and accurate performance measurement system and indicators that are able to quantify important elements of maintenance function performance [5, 15]. Moreover, without having a formal measurement system for maintenance performance, it is difficult to control, plan and improve the maintenance process and consequently can be considered that tracking the performance operations must be a key management issue in any industrial organization. In summary, a proper maintenance performance measurement system shall contribute to: Assess the maintenance function to the strategic company tar• gets. Detect the strengths and weaknesses on the maintenance strat• egy applied. Using quantitative and qualitative data for helping to define and • stablish a continuous improvement process for maintenance. Let us to apply a maintenance benchmarking analysis within and • outside the business related with urban fleet transport.","PeriodicalId":309533,"journal":{"name":"Ekspolatacja i Niezawodnosc - Maintenance and Reliability","volume":"24 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":"115034836","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":"The influence of the friction phenomenon on a forest crane operator’s level of discomfort","authors":"A. Urbaś, M. Szczotka","doi":"10.17531/ein.2019.2.3","DOIUrl":"https://doi.org/10.17531/ein.2019.2.3","url":null,"abstract":"A mathematical model of a forest crane that is suitable for dynamics analysis of its operation cycle is presented in this paper. The flexibility of the operator’s seat, drives and supports is taken into account. Joint coordinates are applied to describe the motion of the links together with the homogeneous transformations technique. Lagrange equations of the second order are used when deriving the equations of motions. Joint forces and torques are determined based on recursive Newton-Euler algorithms. These joint forces are then used in the LuGre friction model, which allows to calculate the friction coefficients and friction forces. Numerical analyses performed here show the influence of various friction forces on the vibration level as perceived by the operator of the crane. The level of discomfort is discussed based on standards commonly used in the vehicle and transportation industry for evaluations of vibration comfort.","PeriodicalId":309533,"journal":{"name":"Ekspolatacja i Niezawodnosc - Maintenance and Reliability","volume":"21 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":"131466162","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}