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

共 6805 条记录，以下是411-420 订阅

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Numerical Investigation of the Breath Figure Spot Characteristics in a Jet Impingement Condensation Process

Numerical Investigation of the Breath Figure Spot Characteri...

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Saudi International Conference on Nuclear Power engineering (SCOPE)

作者： Alshehri, Ali King Fahd Univ Petr & Minerals Mech Engn Dept Dhahran Saudi Arabia King Fahd Univ Petr & Minerals Interdisciplinary Res Ctr Sustainable Energy Syst Dhahran 31261 Saudi Arabia

ISBN: (纸本)9783031643613;9783031643620

Condensation passive containment cooling systems in combination with small modular reactors are pivotal for removing excessive heat from reactors during steam release accident scenarios. However, the presence of non-condensable gases (NCG) significantly reduces the heat transfer, causing safety concerns. This is mainly caused by the accumulation of NCG during condensation. A better understanding of the physics of the accumulation of NCG owing to condensation leads to the design of efficient heat removal and better coolant recovery mechanisms. Additionally, the accumulation of NCG (mainly hydrogen and oxygen) in the main evaporator of a nuclear reactor containment may cause explosion safety concerns. In a recent study, jet impingement condensation (JIC) was reported as an excellent method for achieving high condensation rates owing to the improved thinning of the diffusion boundary layer associated with the accumulation of NCG near the liquid-vapor interface. The high convective heat and mass transfer coefficients associated with impinging jets have been successfully utilized in several industrial applications, such as drying processes, electronic cooling, and cooling of turbine blades, to name a few. Designing an optimal JIC system requires understanding its physics at varying parameters, such as jet size, jet-to-surface distance, jet speed, jet-to-surface temperature/concentration difference, and environmental temperature/concentration. In this study, we present a numerical model to investigate the influence of several parameters on the initial stages of the condensation process. We look mainly at the existence of Breath Figure spots, which are defined as the effective areas at which condensation occurs. The numerical model was validated against experimental and semi-analytical work on a single round jet issued from a tube at a prescribed temperature, NCG concentration, and flow rate. Our model provides an effective numerical tool for better understanding the physi

关键词： Condensation NCG Thermal-hydraulics CFD

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Characterization of 3D Printed Cellular Structures Based on Hollow Spherical Cells 10th

Characterization of 3D Printed Cellular Structures Based on ...

引用

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

作者： Khlif, Mohamed Frikha, Moez Ben Ali, Naserddine Bradai, Chedly Univ Sfax ENIS Natl Engn Sch Sfax Electromech Syst Lab LASEM PB 1173-3038 Sfax Tunisia

ISBN: (纸本)9783031650062;9783031650079

This study investigates the compressive mechanical properties of 3D printed cellular structures based on hollow spherical cells. Utilizing Fused Deposition Modeling (FDM) with polylactic acid (PLA), we fabricated structures with four distinct architectures featuring square-hexagonal stacking and open-closed porosity variations. Each architecture was printed with four different wall thicknesses (0.8 mm, 0.6 mm, 0.4 mm, and 0.2 mm) to analyze the influence of geometric parameters on mechanical performance. Young's modulus of the material was evaluated through a series of carefully controlled quasi-static compression tests, yield strength, and overall stress-strain behavior. The results demonstrate a strong dependence of mechanical properties on the relative density of the structures, which is influenced by both cell morphology and wall thickness. Hexagonal stacking with open porosity and thicker walls exhibited superior strength and stiffness compared to other configurations. The experimental findings align well with the Gibson-Ashby model for cellular structures, confirming the role of relative density in dictating mechanical behavior. This research provides valuable in-sights for the design and fabrication of 3D printed cellular structures with tailored properties for various engineering applications, including tissue engineering and lightweight structural components.

关键词： hollow-spheres-structures polylactic acid (PLA) mechanical properties

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Development of 3D Printed Low-Cost Individualized Actuated Upper Limb Prostheses 8th

Development of 3D Printed Low-Cost Individualized Actuated U...

引用

8th International Scientific-Technical Conference (MANUFACTURING)

作者： Gorski, Filip Marciniak, Agnieszka Wichniarek, Radoslaw Kuczko, Wieslaw Zukowska, Magdalena Rybarczyk, Justyna Poznan Univ Tech Fac Mech Engn Piotrowo 3 PL-60965 Poznan Poland

ISBN: (纸本)9783031564581;9783031564567

The aim of this study was to design and verify in practice a low-cost mechatronic actuated prosthetic device for the upper limb. First, a mechanical prosthesis was built for a test patient - an 40-year male patient with transradial amputation. Automated design methods were applied, using the AutoMedPrint technology. Then, the prosthesis was converted into an actuated, mechatronic device. Two design variants were proposed - the first one with a DC motor and a servo and the second one with two servo mechanisms. They were 3D printed using low-cost printers, assembled - using cheap, widely available electronics, programmed and verified. With participation of experts, a survey was made and the prostheses were evaluated. It was concluded that this research direction is a promising one. It is possible to build functional, actuated prostheses by a fraction of a price of the advanced, commercial bionic solutions, yet they still need further development, functional improvements and tests with patients.

关键词： additive manufacturing 3D printing customization mechatronic prostheses

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Transition of Controlled Atmosphere Brazing Jig for Aluminum Heat Exchangers from Spring-Loaded to Fixed-Dimension 1

引用

8th International Scientific-Technical Conference (MANUFACTURING)

作者： Nadolny, Slawomir Rogalewicz, Michal Poznan Univ Tech Fac Mech Engn Poznan Poland

ISBN: (数字)9783031564673

ISBN: (纸本)9783031564697;9783031564673

One of the important aspects of the Controlled Atmosphere Brazing process is the brazeability of the heat exchanger. It results in not only an easy-to-control tightness but also internal joining of the heat exchange package that affects the performance and mechanical properties of the heat exchanger. The thermal matching of the aluminum alloy, filler metal, and flux plays a significant role in meeting brazeability criteria. It is also necessary to maintain the required brazing parameters in the tunnel furnace, including primarily the process time and maximum temperature that the heat exchanger will reach. Providing fixturing in the form of a brazing jig is also important. Its role is to maintain components in the required alignment and ensure contact between materials even after melting the cladded filler metal. Currently, the direction of development of brazing jigs is towards fixed-dimension, which must be considered even at the design stage of the heat exchanger itself. However, spring-loaded brazing jigs are still available on the market, which are more expensive to operate due to the need to control spring wear and consequently their cyclic replacement. The article below presents research on the possibility of modifying an existing spring-loaded jig into a fixed-dimension one for heat exchangers that were not designed with this in mind.

关键词： CAB HEX Brazing fixture Brazed frame Brazeability

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Exploring Socially Sustainable, Smart Manufacturing - Building Bridges Over Troubled Waters 32nd

Exploring Socially Sustainable, Smart Manufacturing - Buildi...

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32nd International Conference on Flexible Automation and Intelligent Manufacturing

作者： Eriksson, Kristina M. Carlsson, Linnea Olsson, Anna Karin Univ West Dept Engn Sci Trollhattan Sweden Univ West Sch Business Econ & IT Trollhattan Sweden

ISBN: (纸本)9783031381645;9783031381652

Contemporary manufacturing organizations formulate strategies towards smart manufacturing. However, strategies often merely regard technological improvements of working processes and activities and pay limited attention to human-centric perspectives. This study addresses the complex phenomenon of reaching socially sustainable smart manufacturing by exploring the human-centric perspectives in the eras of Industry 4.0 and Industry 5.0. Data were collected through an explorative qualitative case study with focus groups applying the history wall approach to document informants' choices of activities that impact digitalization. To investigate informants' interpretations and experiences of digital initiatives and prospects, the history wall approach was coupled with the analytical lens of the co-workership wheel, with its four conceptual pairs: trust and openness, community spirit and cooperation, engagement and meaningfulness, responsibility, and initiative. A total of 17 informants from different organizational levels at a case company participated. Activities, impacting digitalization, brought forward were grouped into technology, organization, and external impact. Results showed that human-centric and intangible perspectives surfaced as prerequisites when navigating industrial digitalization. Further, digital initiatives and prospects risk drowning in re-occurring organizational changes making successful implementation difficult. Thus, organizations cannot rely solely on technology, but must consider activities related to organizational aspects and impacts from the external environment, when introducing digital initiatives. Intrinsically, recognition of the co-workership concept, emphasizing human-centricity, can support the foundation necessary for bridging the gap towards socially sustainable smart manufacturing and strengthening the emerging I5.0 research.

关键词： Social Sustainability Smart Manufacturing Human-Centric Co-workership Industrial Digitalization Industry 5.0/4.0

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Facile Tuning of Black Nickel Electroplating Bath for Optimal Performance 3rd

Facile Tuning of Black Nickel Electroplating Bath for Optima...

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3rd International Conference on Advanced Surface Enhancement (INCASE)

作者： Wong, Kee Seng Joseph Sun, Yajuan Zhou, Yujie Tan, Yong Teck ASTAR Singapore Inst Mfg Technol SIMTech 2 Fusionopolis WayInnovis 08-04 Singapore 138634 Singapore ASTAR Adv Remfg & Technol Ctr ARTC 3 CleanTech Loop01-01 CleanTech Two Singapore 637143 Singapore

ISBN: (纸本)9789819986422;9789819986439

Black nickel plating is a decorative coating typically electrodeposited from an electroplating bath containing nickel and zinc cations. To ensure coating quality, chemical composition and pH value of plating bath should be closely monitored and maintained within the working ranges, especially when an inert anode is used. With plating by using an inert anode, both pH and bath composition will change and eventually drift out of the working range, leading to coating defects. In this paper, we propose a new methodology to tune the black nickel plating bath back to its usable range, by identifying the critical parameters and their limits, and give a recommended sequence for facile tuning to obtain optimal performance in terms of uniform black appearance. The recommended sequence of tuning is to first adjust the pH value, then the zinc concentration, and finally the nickel concentration when they reach their critical limits. The deposited black nickel coatings are characterized using sphere spectrophotometer and scanning electron microscopy equipped with energy dispersive X-ray spectroscopy where the ratio of deposited zinc to nickel is found to be critical for obtaining a uniform and consistent black appearance.

关键词： Coating Electroplating Black nickel plating Bath analysis Bath tuning

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Numerical Simulation of Thermal Decomposition of Polyethylene with a Single-Particle Model 14th

Numerical Simulation of Thermal Decomposition of Polyethylen...

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14th International Conference on Computational Heat and Mass Transfer (ICCHMT)

作者： Zhang, Feichi Cao, Jun Zirwes, Thorsten Netsch, Niklas Tavakko, Salar Zhang, Rui Bockhorn, Henning Stapf, Dieter Karlsruhe Inst Technol Inst Tech Chem Hermann von Helmholtz Pl 1 D-76344 Eggenstein Leopoldshafen Germany Nanjing Univ Sci & Technol Xiaolingwei St Nanjing 210094 Peoples R China Univ Stuttgart Inst Combust Technol Pfaffenwaldring 31 D-70569 Stuttgart Germany Karlsruhe Inst Technol KIT Engler Bunte Inst Div Combust Technol Engler Bunte Ring 1 D-76131 Karlsruhe Germany

ISBN: (纸本)9783031672408;9783031672415

Numerical simulations have been conducted to study the pyrolysis process of a low-density and a high-density polyethylene (LDPE and HDPE) particle in a hot nitrogen environment. Objective of the work is to gain an in-depth understanding of the interaction between heat transfer and pyrolysis reaction as well as its impact on the overall pyrolysis process. For that purpose, a computational tool using a spherical, thermally-thin particle has been developed, which takes the convective heat transfer and the endothermic pyrolysis reaction into account. The model has first been validated by means of thermogravimetry experiments, where the simulation results have shown a reasonably good agreement with the measured data. Thereafter, the method has been applied to simulate plastic pyrolysis at constant gas temperatures T-g, employing varying particle diameter d(p,0) and heat transfer coefficient alpha. At given T-g, the pyrolysis process is faster at decreased d(p,0) and increased alpha. This is attributed to the enhanced convective heat transfer, which leads to a higher reaction rate. While varying d(p,0) or alpha at constant T-g, the pyrolysis time tau(py) has revealed an almost inversely proportional correlation with the pyrolysis number Py, which represents the ratio of the time scales of chemical kinetics and convective heat transfer. The correlations between tau(py) and Py have been fitted by power law functions, which can be used as a first-order estimate to predict the pyrolysis time at given operating conditions.

关键词： plastic pyrolysis chemical recycling circular economy numerical simulation single particle

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Automation of Fitting Pipe Manufacturing in Shipbuilding 32nd

Automation of Fitting Pipe Manufacturing in Shipbuilding

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32nd International Conference on Flexible Automation and Intelligent Manufacturing

作者： Pejic, Klara von Haugwitz, Konstantin Wanner, Martin-Christoph Fluegge, Wilko Fraunhofer Inst Large Struct Prod Engn IGP Albert Einstein Str 30 D-18059 Rostock Germany

ISBN: (纸本)9783031382406;9783031382413

The use of automated systems in shipbuilding is increasing. Automation in shipbuilding can provide higher levels of accuracy, precision and speed compared to manual labour, making it an ideal tool for many production processes. This research focuses on addressing a problem related to the assembly of fitting pipes for piping systems on ships and it is one of the first to propose an automated robotic cell concept. The paper gives an overview of piping systems on ships, mentions related work, highlights the existing problems with the manual assembly process, and finally proposes a solution to the problem. The proposed solution involves the implementation of a robotic cell consisting of a robot and a cobot to handle the positioning of the piping elements. This approach promises to improve the assembly process and operations management, reduce the potential for human error, minimise time and cost, and improve overall quality control.

关键词： shipbuilding pipe manufacturing automation industry 4.0 robotics

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Using AI Tools to Enhance the Risk Management Process in the Automotive Industry 8th

Using AI Tools to Enhance the Risk Management Process in the...

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8th International Scientific-Technical Conference (MANUFACTURING)

作者： Dragomir, Diana Popister, Florin Kabak, Kamil Erkan Tech Univ Cluj Napoca Cluj Napoca Romania Izmir Univ Econ Izmir Turkiye

ISBN: (纸本)9783031564468;9783031564444

The paper presents an exploratory investigation concerning the usage of AI tools in automotive companies in order to streamline their risk management processes. A risk identification procedure is performed at organizational and process levels, and a comparative analysis is undertaken between the classical approach for developing proper mitigation measures and the AI-supported manner of doing the same. Some of the most popular tools in this field are employed and studied, such as large language models, data analytics and knowledge representation. The differences and changes are analyzed from the point of view of their effectiveness, efficiency and adaptability within the existing manufacturing frameworks in the automotive industry.

关键词： artificial intelligence risk management automotive industry

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Investigation of Scanning Strategy Effects on Porosity and Hardness in Selective Laser Melting of H13 Tool Steel 10th

Investigation of Scanning Strategy Effects on Porosity and H...

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

作者： Kisraoui, Chams Belhadj, Asma Slama, Selma Barka, Noureddine Univ Quebec Rimouski Math Software & Engn Dept Rimouski PQ Canada Univ Tunis El Manar UTM Natl Engn Sch Tunis ENIT Appl Mech & Engn Lab LMAI LR 11ES19 Tunis Tunisia

ISBN: (纸本)9783031650062;9783031650079

This paper presents partial results of a study aimed at optimizing the selective laser melting (SLM) process applied to H13 tool steel. An experimental investigation was conducted to explore the influence of printing parameters, particularly the laser scanning strategy, on the mechanical properties of SLM-manufactured parts. To achieve this objective, eight experimental conditions with different scanning strategies were studied following an in-depth literature review. In this study, porosity and hardness were determined for parts printed using an SLM machine with two scanning strategies: a simple bidirectional approach and a chess pattern with four rotation angles 0 degrees, 45 degrees, 67 degrees, and 90 degrees for each.

关键词： Selective laser melting H13 tool steel Scanning strategy porosity hardness

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