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Cost-Effectiveness of an Automatic Lubrication System for Bearings 1

32nd International Conference on Organization and Technology of Maintenance, OTO 2023

作者： Yildiz, Serkan Apakhan, Murat Aksoy, Muharrem Hilmi IMAS R&D Center Mechanical Engineer Konya4200 Turkey Department of Mechanical Engineering Faculty of Engineering and Natural Sciences Konya Technical University Konya4200 Turkey

ISBN: (数字)9783031514944

ISBN: (纸本)9783031514937

Improper lubrication is a leading cause of bearing failures, accounting for half of all instances. Lubricating bearings with grease or oil forms a protective film that prevents direct metal-to-metal contact, reducing friction and overheating, and prolonging the bearing’s lifespan. Lubrication also acts as a barrier against foreign particles and wear. In this study, an analysis of automatic lubrication in a milling plant was carried out and compared to manuel lubrication. A milling factory with 22 roller mills with a total production capacity of 450 tons/day is considered. It is calculated that the failure of eight bearings in each mill roller due to lubrication issues results in a substantial cost of $39,000 over a two-year period. The Automatic lubrication system named "SmartLub" regulates lubricant quantity, timing, and application points, ensuring optimal lubrication. The choice of the oil pump was determined by considering both the viscosity of the oil and the head loss within the piping system utilized. By adhering to calculated frequencies, the system extends bearing service life to four years. Furthermore, the manual system reduces labor costs by $400 per roller mill every two years, while unplanned downtimes caused by lubrication issues are minimized. The automatic system eliminates the need for bi-monthly one-day shutdowns in the conventional lubrication systems, saving a total of six days per year. With an estimated lifespan of 20 years, the system achieved a payback period of 1.23 years, demonstrating its cost-effectiveness and long-term benefits. Overall, automation in bearing lubrication enhances machine efficiency, reduces spare parts and maintenance costs, and ensures optimal lubrication in the grain milling sector. Its implementation leads to extended bearing lifespan, reduced downtime, and improved profitability. © 2024, The Author(s), under exclusive license to Springer Nature Switzerland AG.

关键词： Economic analysis

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IT Service desk Ticket Classification via Large Language Models 9

IT Service Desk Ticket Classification via Large Language Mod...

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9th International Conference on Computer Science and engineering, UBMK 2024

作者： Paket, Ezgi Şenerkek, Göksu Akyol, Fatma Betül Salman, Furkan Eczacibaş i Bilişim R&d Center DnA Lab Istanbul Turkey Yildiz Technical University Department of Computer Engineering Istanbul Turkey

ISBN: (纸本)9798350365887

Service desk systems are utilized in companies to enable employees to forward their issues or requests to IT support operators. These tickets are assigned by support operators to the appropriate categories based on their personal experiences and the manually prepared keyword-matching catalogs. The dependency on individual experiences and the difficulty of maintaining and updating manually prepared catalogs increase the misclassification rate. This study aims to address a challenging multi-class classification problem in the Turkish language, which includes 172 classes, by utilizing large language models (LLMs). For this purpose, next-generation LLMs such as Titan, Llama, and Mistral are compared with BErT-based models using zero-shot, fine-tuning, and rAG methods within this st udy. This research shows that BErT-based classification models outperform the LLMs, which are not specifically trained for classification tasks with several classes. © 2024 IEEE.

关键词： Classification (of information)

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Fabrication and Characterization of dECM/PVA/GelMA Tissue-Engineered Small-diameter Blood Vessels 30th

Fabrication and Characterization of dECM/PVA/GelMA Tissue-En...

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30th International Conference on Computational and Experimental engineering and Sciences, ICCES 2024

作者： Li, Bing Yuan, Xiaojuan Xiao, Boren du, Zhihua Chen, Junjie Li, Changliu Li, Xiangqin Liu, Tianqing Song, Kedong State Key Laboratory of Fine Chemicals Dalian R&D Center for Stem Cell and Tissue Engineering Dalian University of Technology Dalian116024 China

ISBN: (纸本)9783031687747

Vascular disease is a disease with high lethality, and the development of small-diameter tissue-engineered blood vessels (less than 6 mm in diameter) capable of replacing autologous damaged blood vessels is of great importance. In this study, we first prepared decellularized vascular matrix (dECM), a material that removes immunogenicity and retains active ingredients required for cell growth. Next, methacrylated gelatin (GelMA) was prepared by grafting methacrylic anhydride on gelatin according to a previous method, and a pre-gel solution was prepared by blending it with the polymer polyvinyl alcohol (PVA) and dECM. An isometric combination mold was designed by 3d modeling software, and the pregel solution was infused into the mold, and double cross-linked hydrogel tubes were prepared after repeated freeze-thaw and UV cross-linking and demolding. The results showed that dECM removed most of the dNA but retained a certain amount of active ingredients, such as collagen and glycosaminoglycans. The porous structure of the hydrogels was suitable for cell growth and had suitable mechanical properties. Cellular experiments also demonstrated that the dECM/PVA/GelMA hydrogels had good cytocompatibility and adhesion. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2024.

关键词： Tissue

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research on Motion Characteristics of AC Breaking Arc Under different Contact reed Circuits 3

Research on Motion Characteristics of AC Breaking Arc Under ...

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3rd Asia Power and Electrical Technology Conference, APET 2024

作者： Zhang, Peng Peng, Yong Zhang, Linliang Chen, Jianyi Zheng, Xubin Liu, Xiangjun School of Electrical Engineering and Automation Fuzhou University Fuzhou China R&D Center Zhejiang Great Electrical Co. Ltd Jiaxing China

ISBN: (纸本)9798350367690

Unlike most dC relays that require permanent magnets for arc blowout, AC magnetic latching relays do not have a permanent magnet installed, nor do they have any other arc-extinguishing measures. Instead, they rely on the contact separating to lengthen the arc, and extinguish the arc at the zero crossing of the AC current. The AC arc, under the influence of the magnetic field generated by the contact reed system, undergoes motion. This moving arc not only erodes the contacts but also potentially ablates and damages the plastic connecting rod in the force transmission mechanism, dynamic reed, and walls of the arc extinguishing chamber. Therefore, the simulation models of two kind of AC magnetic latching relay with different contact reed structure are established. Based on electromagnetic field and magneto-hydrodynamic simulation, the arc motion directions under U-shaped and Z-shaped contact reed systems are studied and the accuracy of the models are verified by experiments. The results show that the arc motion directions are significantly influenced by the configuration of the contact reed system. Specifically, the arc blows towards the connecting rod in the U-shaped circuit, while it blows away from the connecting rod in the Z-shaped circuit. The research presented in this paper provides valuable insights for the optimal design, performance improvement, and load capacity enhancement of AC relays. © 2024 IEEE.

关键词： Permanent magnets

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Antibacterial hydrogel with pH-responsive microcarriers of slow-release VEGF for bacterial infected wounds repair

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Journal of Materials Science & Technology 2023年第13期144卷 198-212页

作者： Xiaofei Xie Huan Lei daidi Fan Shaanxi Key Laboratory of Degradable Biomedical Materials School of Chemical EngineeringNorthwest UniversityXi’an 710069China Shaanxi R&D Center of Biomaterials and Fermentation Engineering School of Chemical EngineeringNorthwest UniversityXi’an 710069China Biotech.&Biomed.Research Institute Northwest UniversityXi’an 710069China

Bacterial infection causes wound inflammation and makes angiogenesis *** is urgent to develop effectively antibacterial and pro-vascularizing dressings for wound *** hydrogel is developed with pH-responsive drug-releasing microcarriers which were loaded with vascular endothelial growth factor(VEGF)that promotes angiogenesis and actively respond to wound pH for control and prolong VEGF *** surfaces of the microcarriers were coated with polydopamine which can reduce the silver nanoparticles(AgNPs)in situ,and dynamically crosslink with the polyacrylamide,which forms a stable slow-release system with different release behavior for the VEGF and *** hydrogel inhib-ited bacterial formation and accelerated wound *** the hydrogel dressing,83.3%±4.29%of the wound heals at day 7,which is 40.9%±8.5%higher than the non-treatment group in defect infected *** antibacterial properties of hydrogel down-regulate early inflammation-related cytokines,and the release of VEGF in the middle and late phases of wound healing in response to pH changes pro-motes angiogenesis and up-regulate the expression of angiogenesis-associated *** sequential release of antibacterial agents and pro-vascularizing agents in response to the change in wound microen-vironmental cues facilitate temporally controlled therapy that suites the need of different wound healing ***,the hydrogel loaded with multifunctional microcarriers that enable controlled release of AgNPs and VEGF is an effective system for treating infected wounds.

关键词： Antibacterial pH-responsive microcarriers Slow-release Infected wound repair

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Bio-Inspired Secondary Suspension design and dynamics Analysis of High Temperature Superconducting Maglev Train

Bio-Inspired Secondary Suspension Design and Dynamics Analys...

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2023 IEEE International Conference on Applied Superconductivity and Electromagnetic devices, ASEMd 2023

作者： Sun, Yougang Zhang, dandan Ji, Jiayi Xu, Junqi Tongji University Institute of Railway Transit and National Maglev Transportation Engineering R&d Center Shanghai200092 China

ISBN: (纸本)9798350301571

due to the unevenness of the magnetic field in the permanent magnet track, crosswinds, and weak damping characteristics of the system, vibration in High Temperature Superconducting (HTS) vehicles is inevitable during operation. Therefore, the development of a new secondary suspension structure that minimizes the adverse effects of vibration on the system is crucial for improving ride comfort and promoting the rapid development of HTS maglev train. Inspired by the vibration reduction mechanism in the limb structure of cranes during motion, this study systematically investigates a bioinspired asymmetric X-type suspension structure. The asymmetric X-type structure consists of vertically arranged springs with different lengths and different linear stiffness, providing flexible quasi-zero stiffness or negative stiffness for passive vibration control. By applying the bio-inspired asymmetric X-type suspension structure to the HTS maglev vehicle system and conducting simulations using a Simulink model, the damping effect is optimized by 31.1% compared to traditional suspensions. This validates that the bio-inspired asymmetric X-type suspension structure can effectively improve the vibration reduction performance of HTS maglev vehicles. © 2023 IEEE.

关键词： bioinspired structure High temperature superconductivity maglev secondary suspension vibration suspression

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Control Study of Enhanced STATCOM for Supercapacitor Applying Virtual Synchronous Generator Control

Control Study of Enhanced STATCOM for Supercapacitor Applyin...

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2024 IEEE Energy Conversion Congress and Exposition, ECCE 2024

作者： Nada, Kaho Fujii, Toshiyuki Sano, Kenichiro Mitsubishi Electric Corporation Advanced Technology R&d Center Hyogo Japan Institute of Science Tokyo Department of Electrical and Electronic Engineering Tokyo Japan

ISBN: (纸本)9798350376067

The enhanced static synchronous compensator (E-STATCOM), which is equipped with a supercapacitor and can output active power, is attracting attention as a compensator that can both suppress grid voltage fluctuations and maintain short-term frequency during transients. The authors propose a virtual inertia control based on current control-type converters. The method can suppress overcurrent and manage the dC voltage of the converter, which are issues with the typical grid forming control employing voltage control-type converters. The proposed control configuration is based on an established current-controlled STATCOM. However, a virtual synchronous generator control can be achieved simply by adding to the dC voltage reference of the conventional STATCOM control. The simulation results show that it is possible to achieve continuous operation for the three-phase line to ground fault, and STATCOM's active and reactive power outputs are possible to suppress system oscillations after the fault is cleared. © 2024 IEEE.

关键词： Synchronous generators

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Transforming rTLS data Architecture to Big data Architecture for Location data

Transforming RTLS Data Architecture to Big Data Architecture...

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2023 Innovations in Intelligent Systems and Applications Conference, ASYU 2023

作者： Yilmaz, Ceren Bahar Govem, Oguz Unalir, Murat Osman Litum Information Technologies R&d Center Izmir Turkey Ege University Department of Computer Engineering Izmir Turkey

ISBN: (纸本)9798350306590

real-time Location System (rTLS) locates and monitors any person or asset within a defined zone covered by a radio frequency (rF) network. This system produces location data for each entity to track from several times per second to every few minutes, depending on how often it is desired to refresh the location data. The increase in the volume of data that is required to be collected, stored, processed, analyzed, and reported, is one of the reasons for the development of big data technologies. This paper aims to explain the transformation of data architecture according to the target short-term and long-term analytical needs of rTLS and to compare traditional architecture and big data architecture on read times and storage costs. In order to achieve that, the data in the relational database system is extracted *** files in its raw form with a microservice triggered daily within the relational database management system. data is processed in Python language to meet the three different reporting requirements of rTLS. Analyzed data is stored in a column-family NoSQL database Apache Cassandra by modeling differently in line with the query parameters for faster query purposes. By not archiving the location data on the relational database, without affecting the performance health of rTLS, meaningful results are produced from this data and are reported on the application. As the size of the input and output data used for reporting increases, the need to use a NoSQL database is essential in terms of query response times. NoSQL database systems may require the same data to reside in multiple tables, so the storage cost per row is about 67% lower than SQL database, but as the number of queries to the data increases, storage costs can exceed SQL databases. © 2023 IEEE.

关键词： Big data

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Preparation and Characterization of 3d Printed dECM/GelMA/NC/SA Tissue Engineered Hybrid Scaffold 30th

Preparation and Characterization of 3D Printed dECM/GelMA/NC...

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30th International Conference on Computational and Experimental engineering and Sciences, ICCES 2024

作者： Shu, Yan Ye, Jinmeng Tang, Yuanyuan Fu, Tianlin Xing, Bao Liu, Ke Li, Jie Li, Xiangqin Song, Kedong State Key Laboratory of Fine Chemicals Dalian R&D Center for Stem Cell and Tissue Engineering Dalian University of Technology Dalian116024 China

ISBN: (纸本)9783031687747

At present, in vitro colorectal tumor model has received extensive attention. Among them, decellular matrix (dECM) is widely used in the preparation of tissue engineering scaffolds due to its excellent biocompatibility, low immunity and natural three-dimensional structure. Among them, there are abundant capillaries and lymphatic capillaries in the villi of the fold on the inner surface of the small intestine of pigs, which is conducive to the absorption of nutrients. In this experiment, physical, chemical and biological enzyme methods were combined to decellularize pig small intestine to obtain dECM. SEM and histochemical staining proved that the microstructure of the tissue was not destroyed and the cells were effectively removed after decellularization. Two kinds of hydrogel scaffolds were prepared by 3d extrusion bioprinting using dECM, methacrylated gelatin (GelMA), sodium alginate (SA) and nano-clay (NC). The mechanical properties, microstructure and biocompatibility of scaffolds were characterized. The results showed that dECM can reduce the pore size of the scaffold, improve the mechanical strength of the scaffold, and facilitate cell adhesion, growth, proliferation, migration and aggregation. dECM/GelMA/SA/NC scaffold is expected to provide a promising platform for the construction of colorectal tumor models in vitro. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2024.

关键词： Tumors

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Bird’s-Eye View Semantic Segmentation and Voxel Semantic Segmentation Based on Frustum Voxel Modeling and Monocular Camera

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Journal of Shanghai Jiaotong university(Science) 2023年第1期28卷 100-113页

作者：秦超王亚飞张宇超殷承良 School of Mechanical Engineering Shanghai Jiao Tong UniversityShanghai 200240China Shanghai Intelligent and Connected Vehicle R&D Center Co. Ltd.Shanghai 201499China

The semantic segmentation of a bird’s-eye view(BEV)is crucial for environment perception in autonomous driving,which includes the static elements of the scene,such as drivable areas,and dynamic elements such as *** paper proposes an end-to-end deep learning architecture based on 3d convolution to predict the semantic segmentation of a BEV,as well as voxel semantic segmentation,from monocular *** voxelization of scenes and feature transformation from the perspective space to camera space are the key approaches of this model to boost the prediction *** effectiveness of the proposed method was demonstrated by training and evaluating the model on the NuScenes dataset.A comparison with other state-of-the-art methods showed that the proposed approach outperformed other approaches in the semantic segmentation of a *** also implements voxel semantic segmentation,which cannot be achieved by the state-of-the-art methods.

关键词： semantic segmentation voxel semantic segmentation deep learning convolution neural network bird’s-eye view(BEV)

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