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检索条件"丛书名=Lecture Notes in Mechanical Engineering"

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Metadata Model Construction and Annotation Framework to Build Product Data Repository for Cloud Manufacturing 32nd

Metadata Model Construction and Annotation Framework to Buil...

引用

32nd International Conference on Flexible Automation and Intelligent Manufacturing

作者： Lim, Eunchae Kim, Changyeong Lin, Zeyue Shen, Yinfeng Liu, Shengyu Kim, Kyoung-Yun Yang, Hyung-Jeong Chonnam Natl Univ Dept Artificial Intelligence Convergence Gwangju 61186 South Korea Wayne State Univ Dept Ind & Syst Engn Detroit MI 48202 USA

ISBN: (纸本)9783031381645;9783031381652

This paper presents a framework for automatically building a product data repository, overcoming the limitations of machine understanding and the time-consuming, costly nature of manual human annotation. In this study, we focus on Personal Protective Equipment (PPE), specifically respirator mask product categories, as a case study. First, we extract product specifications from the details and sub-details sections of product pages and build < attribute, attribute-values > metadata in dictionary form. Second, to process the data, we represent numerical data with a special token [NUM] and use hierarchical clustering based on Term Frequency-Inverse Document Frequency (TF-IDF) and cosine similarity for categorical data. Third, we propose an algorithm-based method to annotate product attributes and attribute values in product descriptions using the metadata, while minimizing human efforts. Additionally, we employ BIO tagging to extract location information for attribute values, streamlining the overall annotation process. This paper contributes to the field by presenting a method for automatically generating product-related datasets through an algorithm that enables the construction of metadata without any human intervention. This approach is a crucial step toward implementing a knowledge repository in aCloud Manufacturing (CM) environment. Particularly, by addressing time and effort concerns in the dataset construction process, this method can significantly contribute to the creation of large-scale datasets.

关键词： Attribute values extraction Product data Data integration Graph database Knowledge graph Cloud manufacturing Metadata model

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Machine Vision System for Quality Control of Stents Used in Angioplasty 1

引用

8th International Scientific-Technical Conference (MANUFACTURING)

作者： Kujawinska, Agnieszka Diering, Magdalena Przybyl, Anna Poznan Univ Tech Pl M Sklodowskiej Curie 5 PL-60965 Poznan Poland

ISBN: (数字)9783031564673

ISBN: (纸本)9783031564697;9783031564673

Traditional visual inspection - compared to automated inspection is not very effective, but for various reasons it is still used in many industries, including medical one. This paper discusses an example of visual inspection in the manufacture of stents used in angioplasty. The use of such inspection is economically justified here due to the low probability of non-conformity, even with the associated high risk of error, which can result in loss of patient health. This paper presents the concept of automating stent quality assessment through the implementation of a Machine Vision System. To support operator decision making in the proposed system, a decision model using artificial neural networks has been developed. The paper demonstrates the potential of such an implementation to minimize multiple sources of weakness in the visual inspection used so far. The paper presents the verification results and evaluation of the feasibility of using a vision-based system for quality control of angioplasty stents.

关键词： Machine Vision System Machine Learning Quality Control Visual Inspection Angioplasty Drug Eluting Stents

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Assessment of Human Errors in a Cable Manufacturing Organisation 1

引用

33rd International Conference on Flexible Automation and Intelligent Manufacturing

作者： Ramogale, Frans Makinde, Olasumbo Munyai, Thomas Tshwane Univ Technol ZA-0001 Pretoria South Africa Univ Johannesburg ZA-2028 Johannesburg South Africa

ISBN: (数字)9783031744853

ISBN: (纸本)9783031744846;9783031744853

In a cable manufacturing environment, human errors are somewhat prevalent, which most of the time result in cable defect production, rework, and scrap. Systematic classification of human errors in a cable manufacturing environment, which play a key role to effectively resolve them using smart solutions is still a grey research area. In light of this, this study holistically appraises the myriads of human errors that emanate during cable manufacturing. In order to achieve this, the end-to-end processes deployed to produce cable in a manufacturing organisation was observed for a period of a month. On the one hand, the result of the human error assessment in cable manufacturing revealed that perception of types and quantities human error, memory-related human error and perception of states human error are the critical human errors that occur when producing cable. On the other hand, the human error assessment exercise revealed that incorrect machine operational settings, non-preparation of machine for production, usage of wrong tooling for cable production, usage of contaminated materials, non-inspection of the received raw materials for all quality-related parameters, and usage of wrong quantity of colouring ink on a cable are typical examples of human errors that results into cable defect production in an organisation.

关键词： Human Error Cable Manufacturing Quality Defect

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A Study on Soluble Boron Control During Load-Follow Operation Using Sliding Mode Observer in APR1400

A Study on Soluble Boron Control During Load-Follow Operatio...

引用

Saudi International Conference on Nuclear Power engineering (SCOPE)

作者： Khalefih, Husam Kim, Yonghee Korea Adv Inst Sci & Technol KAIST Dept Nucl & Quantum Engn 291 Daehak Ro Daejeon 34141 South Korea

ISBN: (纸本)9783031643613;9783031643620

During daily load-follow operation, the xenon concentration in the reactor changes over time due to reactor power variation. To compensate for this change, the soluble boron concentration in the core is adjusted through dilution or boration. However, since xenon is not directly measurable in the reactor, the sliding mode observer is utilized to estimate the xenon concentration prior to the daily load-follow operation. The robustness of the sliding mode observer relies on accurate estimation of the observer gains used in the model, ensuring the sliding surface is reached within a finite time. The results indicate good agreement between the observed xenon concentration and the actual xenon concentration variation in the core, calculated using time-dependent xenon concentration simulation. This analysis was conducted using a two-step procedure: cross-section evaluation using the SERPENT continuous energy Monte Carlo code, and whole core calculations to generate the lumped parameters were performed using an in-house diffusion code called KANT.

关键词： APR1400 Sliding Mode Observer Boron Xenon LFO

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High Phosphorus Nickel Alloy Deposition by Brush Plating Process 3rd

High Phosphorus Nickel Alloy Deposition by Brush Plating Pro...

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3rd International Conference on Advanced Surface Enhancement (INCASE)

作者： Zhou, Yujie Huang, Zhaohong ASTAR Singapore Inst Mfg Technol SIMTech 2 Fusionopolis WayInnovis 08-04 Singapore 138634 Singapore ASTAR Adv Remfg & Technol Ctr ARTC 3 Cleantech Loop01-01Cleantech Two Singapore 637143 Singapore

ISBN: (纸本)9789819986422;9789819986439

Nickel (Ni) alloy coating with high phosphorus (P), P > 10wt.%, is usually deposited by electroless and electrolytic plating processes and has been widely used for corrosion and wear resistance applications. However, the deposition rate is low and plating tanks with temperature control are required, and not viable for on-site coating and coating repair. The tank-free brush plating is usually controlled by constant voltage and featured with high deposition rate due to high current density (>100 A/dm(2)), while the current density of conventional tank plating is usually lower than 10 A/dm(2). However, the high current density of brush plating leads to a challenge to deposit a high phosphorus (Hi-P) Ni alloy, as the P content in the nickel phosphorus (NiP) alloy coating is inversely proportional to the operating current density based on the tank plating practices. In this paper, we report a brush plating process to deposit high phosphorous nickel thin film on carbon steel coupons. Design of experiments (DOE) was used to optimize the brush plating process, including plating bath formation, and plating parameters. It is found that low pH value and high phosphorous acid (H3PO3) concentration in the plating bath are beneficial for high P content in the NiP deposit. High pH value and low 1-hydroxyethylidene-1,1-diphosphonic acid (HEDP) concentration are beneficial for high current efficiency. By using the optimized bath chemistry and plating parameters, NiP coating with P content of 13.7 wt% was deposited on carbon steel coupons with a current efficiency as high as 19.4%.

关键词： Brush plating Nickel alloy plating High phosphorus nickel plating Nickel bath formulation High current density plating

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Determination of Acoustic Properties of Railway Ballast 14th

Determination of Acoustic Properties of Railway Ballast

引用

14th International Workshop on Railway Noise (IWRN)

作者： Zhang, Xianying Squicciarini, Giacomo Jeong, Hongseok Thompson, David Tongji Univ Key Lab Rd & Traff Engn Minist Educ Shanghai 201804 Peoples R China Tongji Univ Shanghai Key Lab Rail Infrastruct Durabil & Syst Shanghai 201804 Peoples R China Univ Southampton Inst Sound & Vibrat Res Southampton SO17 1BJ England Korea Res Inst Ships & Ocean Engn Daejeon 34103 South Korea

ISBN: (纸本)9789819978519;9789819978526

As a porous material, railway ballast has absorptive properties that are important for the noise produced by the railway system. To understand its acoustic behaviour, measurements are presented on 1:5 scale ballast. Following direct measurements of the flow resistivity and porosity, transfer function methods are used in a vertical impedance tube to determine the surface impedance and absorption coefficient of different depths of ballast. The complex wavenumber is determined through transfer function measurements within the medium in the vertical tube. The Johnson-Champoux-Allard model for porous materials is fitted to these measurements, allowing determination of the remaining parameters, thermal and viscous characteristic lengths and tortuosity. The parameters are finally adopted to predict the diffuse field absorption coefficient of the scale ballast and full-size ballast. These are compared with measurements, showing acceptable agreement.

关键词： Ballast properties Acoustic absorption Sound propagation

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Metamaterial-Based Vibration Suppression of Beams 15th

Metamaterial-Based Vibration Suppression of Beams

引用

15th International Conference on Vibration Problems (ICoVP)

作者： Basta, Ehab Emam, Samir Ghommem, Mehdi Amer Univ Sharjah Dept Mech Engn Sharjah 26666 U Arab Emirates

ISBN: (纸本)9789819959211;9789819959228

We investigate the nonlinear vibrations of a metamaterial structure that consists of a host Euler-Bernoulli beam attached to a periodic array of spring-mass-damper subsystems deployed for vibration absorption. The main objective is to demonstrate that the capability of the metastructure to suppress vibration can be significantly enhanced when the absorbers are tuned to the optimal frequency. The results show that the simultaneous suppression of several modes is possible by tuning and properly placing each absorber along the host structure. Furthermore, the impact of the resonators on the nonlinear behavior of the main structure when subjected to external forcing over an extended frequency range is investigated. The numerical study reveals that proper tuning of the local resonators allows significant vibration suppression of the metamaterial beam when being excited in the neighborhood of the natural frequencies. The optimization results show that significant mitigation can be achieved by tuning properly the absorbers in the vicinity of the host structure's natural frequencies.

关键词： Metastructure Conserved-mass Nonlinear vibration Vibration suppression

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Evaluation of Parameters for Magnesium Fabrication by Powder Metallurgy Route 10th

Evaluation of Parameters for Magnesium Fabrication by Powder...

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10th International Conference on Design and Modeling of mechanical Systems (CMSM)

作者： Fathi, Mohammed Ibrahim Terres, Mohamed Ali Yagoob, Jawdat Ali Univ Tunis El Manar Natl Sch Engineer Tunis Tunis Tunisia Univ Kirkuk Coll Dent Dept Med Basic Sci Kirkuk Iraq Univ Tunis Mech Mat & Proc Lab LR99ES05 ENSIT 5 AV Taha Hussein Montfleury Tunis Tunisia Northern Tech Univ Engn Tech Coll Kirkuk Kirkuk Iraq

ISBN: (纸本)9783031650062;9783031650079

The key benefits of magnesium and its alloys are their high biocompatibility and specific strength. Powder metallurgy is a contemporary method for the preparation of materials based on magnesium. The micro-hardness of pure magnesium (Mg) samples is evaluated in this study after they were produced through the powder metallurgy process. Magnesium powder's purity and microstructure were examined using electron microscopy and x-ray diffractometry. The cold compaction of powdered magnesium was examined. At laboratory temperature, magnesium powder with a mean particle size of 30 mu m was compressed using pressures of 400, 450, 500, 550, 600, and 650 MPa. The impact of compacting pressure was examined using %porosity and green density. It was found that a pressure of 650 MPa produced the best density of 1.715 gm/cm(3) and%porosity of 1.323. The sintering process was conducted at three different temperatures (455, 525, and 585 degrees C) and three different sintering time (30, 45, 60) min. It was found that 525 degrees C for 30 min produced the best results, with a density of 1.725 g/cm(3), porosity of 0.75%, and micro-hardness of 97.77%.

关键词： Evaluation Magnesium Powder metallurgy Sintering process Microhardness

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Conceptual Design for an Advanced High Field 30 MeV Superconducting Cyclotron for Medical Isotopes Production

Conceptual Design for an Advanced High Field 30 MeV Supercon...

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Saudi International Conference on Nuclear Power engineering (SCOPE)

作者： Alrashdi, A. O. Alkadi, M. A. Alshammari, S. M. Alharbi, K. S. Altuijri, S. A. Alkhulayfi, K. A. Aldawood, A. S. KACST King Abdullah Rd Riyadh 11442 Saudi Arabia

ISBN: (纸本)9783031643613;9783031643620

Radioisotopes are one of the essential cornerstones of modern medicine. They may be used for both diagnostic and therapeutic purposes. Here we present a description of a compact high field superconducting magnet used for a 30 MeV cyclotron with a magnetic field 2 times higher than conventional H-cyclotrons developed recently. This magnet will be a modern, state of the art design, which, because of the higher magnetic field, smaller, lower maintenance, lighter weight and lower power consumption than any other magnet available. The purpose of this design to help cyclotron to provide a sustainable supply of the critical Imaging Isotope F-18 and N13, to eliminate the need for supply from other production facilities for small centers. This paper mainly focuses on the simulation results of the Magnet proposed for our project as the Magnet design is 60% of the overall TAAC30 cyclotron Design.

关键词： Isochronous Magnet Yoke Coil Target

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Numerical Modeling of Wave Impact on Floating Bodies 1

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2022 International Association for Hydraulic Environmental engineering and Research Asia Pacific Division

作者： Arya, Thomas Srineash, V. K. Behera, Manasa Ranjan Indian Inst Technol Civil Engn Dept Powai India

ISBN: (数字)9789819760091

ISBN: (纸本)9789819760084;9789819760091

Wave-in-deck loading is a complex nonlinear phenomenon affecting marine structures' reliability and structural integrity. Apart from the usual waves in the sea, these structures are also subjected to extreme waves, which induce significant loadings. Another design consideration is the air-gap, which is the vertical distance measured from extreme sea-surface elevation (crest) to the underside of the deck. This distance gets reduced during an extreme event, causing additional higher magnitude forces than the design load. The air-gap position also creates unnecessary pressure loads due to the entrapment of air inside during the event. Studies are being carried out on fixed offshore platforms. However, such analysis is still immature on the floating offshore platforms and requires attention. In the present study, a regular wave interaction with a vertical cylindrical floating body is examined. The investigation is done using an open-source numerical tool, REEF3D. The validation of this tool is carried out using the experimental work from the past literature. In the present work, a free heave decay test is carried out and compared with the experimental results from the past literature. Further, the wave interaction with the unmoored floating cylinder is studied by subjecting the cylindrical structure to regular waves. Based on the study, it is noticed that the CFD tool REEF3D is able to simulate the wave-structure interaction process and the validation exercise is satisfactory. The study is planned to further extend to carry out a parametric investigation involving the effect of wave parameters on the responses of the floating vertical cylinder. Further, the moored floating body dynamics under waves will be studied in the future.

关键词： CFD REEF3D Floating offshore platforms Wave impact Wave-structure interaction

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