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Update: 2021-07-01
Task „Implementation of procedures ensuring the originality of scientific papers published in the quarterly „Eksploatacja i Niezawodność – Maintenance and Reliability” financed under contract 532/P-DUN/2018 from the funds of the Minister of Science and Higher Education for science dissemination activities.
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Research on preventive maintenance strategy of Coating Machine based on dynamic failure rateDOI: 10.17531/ein.2023.1.20
Issue: Article citation info: Gu D, Nie R, Han W, Chen G, JIA L, Research on preventive maintenance strategy of Coating Machine based on dynamic failure rate . Eksploatacja i Niezawodnosc – Maintenance and Reliability 2023: 25(1) http://doi.org/10.17531/ein.2023.1.20
Abstract: In this paper, a dynamic preventive maintenance strategy is proposed for the problem of high maintenance cost rate due to excessive maintenance caused by unreasonable maintenance threshold setting when complexelectromechanical equipment maintenance strategy is formulated. Increasing failure rate factor and decreasing service age factor are introduced to describe the evolution rules of failure rate during the maintenance of the coating machine, and the BP-LSTM (BP-Long Short Term Memory Network, BP-LSTM) model is combined to predict the failure rate of the coating machine. A Dynamic preventive maintenance Model (DM) that relies on dynamic failure rate thresholds to classify the three preventive maintenance modes of minor, medium and major repairs is constructed. A dynamic preventive maintenance strategy optimization process based on Genetic-Particle Swarm Optimization (GPSO) algorithm with the lowest cost rate per unit time in service phase is built to solve the difficult problem of dynamic failure rate threshold finding. Based on the historical operating data of the coating machine, a case study of the dynamic preventive maintenance strategy of the coating machine was conducted to verify the effectiveness of the model and the developed maintenance strategy proposed in this paper. The results show that the maintenance strategy developed in this paper can ensure better economy and applicability. |
Increasing the operational reliability of a ship by using a composite impeller in the event of hydrophore pump failureDOI: 10.17531/ein.2023.1.18
Issue: Article citation info: Jabłońska M, Jurczak W, Ozimina D, Adamiak M, Increasing the operational reliability of a ship by using a composite impeller in the event of hydrophore pump failure. Eksploatacja i Niezawodnosc – Maintenance and Reliability 2023: 25(1) http://doi.org/10.17531/ein.2023.1.18
Abstract: The time-consuming technological process of manufacturing impellers and the high production costs are the reason for the search for alternative materials and manufacturing methods. In this paper, based on a literature analysis, the performance of a pump with an impeller that was manufactured by an incremental method from polyethylene terephthalate with an admixture of glycol and carbon fibre (PETG CF) was selected and studied. Operation tests were conducted on the ship’s rotodynamic pump test bench. The composite impeller pump was shown to have an efficiency at the selected printing parameters of 26,23%, comparable to a tin bronze impeller, which has an efficiency of 27,7%. The maximum pump useful power with the impellers tested was 337 W at a flow rate of 4.42 m3/h. The results confirm that, with a filament layer height of 0.12 mm and 100% fill in the four print contours, the pump characteristics obtained are consistent with those of the reference impeller. This fact ensures continuous operation of the ship’s pump for 48 hours which makes the chosen manufacturing method a reliable emergency method of impeller repair in offshore operations |
Methodological aspects of risk mapping in multimode transport systemsDOI: 10.17531/ein.2023.1.19
Issue: Article citation info: Kukulski J, Lewczuk K, Góra I, Wasiak M, Methodological aspects of risk mapping in multimode transport systems. Eksploatacja i Niezawodnosc – Maintenance and Reliability 2023: 25(1) http://doi.org/10.17531/ein.2023.1.19
Abstract: Efficient transport solutions are based on multimodal systems, with the dominant role of rail and road transport in land versions of the systems and the connecting and directing part of intermodal terminals, transhipment terminals or warehouse centres. The implementation of transport processes is always associated with the risk of lack of timeliness (quality) or threats to people, equipment and cargo (safety) resulting from human, technical, organizational and global factors like pandemics or war. The article contains a risk mapping method in multimodal transport systems configured to estimate the risk of lowering the quality of logistics services (on-time deliveries, etc.). The method combines factors usually considered separately in studies on individual modes of transport. A formal notation of risk factors as a mathematical model was proposed, and a case study was provided to picture the implementation. |
Analysis of energy efficiency and dynamics during car accelerationDOI: 10.17531/ein.2023.1.17
Issue: Article citation info: Graba M, Bieniek A, Prażnowski K, Hennek K, Mamala J, Burdzik R, Śmieja M, Analysis of energy efficiency and dynamics during car acceleration. Eksploatacja i Niezawodnosc – Maintenance and Reliability 2023: 25(1) http://doi.org/10.17531/ein.2023.1.17
Abstract: In this work, the authors focused on analyzing the energy efficiency and dynamics during car acceleration, featuring investigation of acceleration dynamics under various acceleration intensities. The tests were performed in the speed range between 45 km/h and 120 km/h, at a constant gear ratio. This enabled obtaining variable dynamic parameters of the acceleration process, ranging from about 0.1 to 1.4 m/s2, and recording variation in fuel consumption from 6.28 to 27.03 dm3/100km. The study focused on determining the relation between fuel consumption, energy efficiency and vehicle acceleration depending on the available drivetrain power. The relation between fuel consumption and vehicle acceleration was described by using the dynamic index. The proposed dynamic index takes into account the energy (from burned fuel) and vehicle acceleration intensity to obtain an objective metric for characterizing the acceleration process. The aforementioned index takes the form of the passenger car movement energy quality index and can be related to widely known physical properties, thus ensuring its universality. The index expresses the energy expenditure within the time needed to accelerate a vehicle weighing 1kg by a 1m distance. As opposed to other criteria that are applied to the assessment of passenger cars dynamics, the index shows a high determination coefficient R2 in excess of 0.99, and can be used as a universal metric to test other vehicle types. |
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