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

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Comparative Assessment of Flow Patterns and Hydrodynamics in Cylindrical and Hourglass-Shaped Pin-Fin Configurations 14th

Comparative Assessment of Flow Patterns and Hydrodynamics in...

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

作者： Jaseliunaite, Justina Seporaitis, Marijus Lithuanian Energy Inst Lab Nucl Installat Safety Kaunas Lithuania

ISBN: (纸本)9783031672408;9783031672415

Electronic devices require efficient cooling to prevent overheating and ensure reliability. Pin-fins, commonly used in devices like computer processors and LED lighting, enhance heat transfer. Micro-pin-fin arrays in forced-flow heat exchangers are vital for intense cooling. Exploration of pin-fin shapes is needed to maximize heat transfer. Therefore, understanding flow patterns and coherent structures in pin-fin arrays is crucial. They offer insights into heat transfer mechanisms and ways to enhance thermal performance. Our research aims to compare flow patterns between cylindrical and hourglass-shaped pin-fins via URANS simulations using OpenFOAM CFD software. We conducted a numerical analysis of hydraulic resistance and flow patterns in both cylindrical and hourglass-shaped pin-fin arrays, utilizing Omega criteria and critical point theory. Our key findings indicate that using hourglass-shaped pin-fins in microchannel heat exchangers can reduce hydraulic resistance by 6% to 12%. Additionally, vortical structures exhibit similar patterns near the endwall region, where flow detachment leads to the formation of a horseshoe vortex. Furthermore, behind hourglass-shaped pins, colliding streams change direction more abruptly, resulting in heightened mixing, the creation of intricate vertical patterns, and an increased prevalence of smaller structures when compared to cylindrical pin-fins.

关键词： Micro-channel Pin-fins Flow structure Hourglass-shape pin

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Manufacture of a New Sustainable Material from Bacterial Cellulose from Organic Waste in a Circular Economy Framework 7th

Manufacture of a New Sustainable Material from Bacterial Cel...

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7th International Workshop on Autonomous Remanufacturing (IWAR)

作者： Moreno-Diaz, Cristina Maresca, Piera Fera, Marcello Gonzalez-Arranz, Salvador Univ Politecn Madrid Madrid Spain Univ Campania Luigi Vanvitelli Caserta CE Italy

ISBN: (纸本)9783031526480;9783031526497

The circular economy introduces a novel approach to sustainable production and consumption, emphasizing collaboration to develop innovative business models. Material innovation is a key element in aligning with this circular economy, transcending traditional disciplinary boundaries. This article focuses on bacterial cellulose, a material naturally produced by bacteria. Due to its mechanical strength and eco-friendly qualities, it offers a sustainable alternative to plastic materials. We start with a theoretical-technical overview and then explore practical Do It Yourself (DIY) applications. Our emphasis is on producing bacterial cellulose from local organic waste, in line with circular economy principles. We conduct a field study to assess local producers' readiness to contribute organic waste for bacterial cellulose production. The waste collected is used to create practical, disposable, and compostable solutions, which are returned to local stakeholders, closing the production and consumption loop. These solutions also serve as raw materials for further cellulose synthesis. In summary, this article investigates bacterial cellulose as a sustainable material and implements a circular economy approach by utilizing local organic waste for material production and reuse. This contributes to a more sustainable, closed-loop system, fostering innovation and collaboration.

关键词： Circular economy Sustainable materials Zero manufacturing waste

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Speed Profile Generation for a Dual Motor Equipped Electrified Series Hybrid Tracked Vehicle Through Dynamic Programming Based Energy Optimization Procedure 16th

Speed Profile Generation for a Dual Motor Equipped Electrifi...

引用

16th International Symposium on Advanced Vehicle Control

作者： Gocer, Ismail Baslamisli, S. Caglar FNSS Savunma Sistemleri AS Ankara Turkiye Hacettepe Univ Mech Engn Dept Ankara Turkiye

ISBN: (纸本)9783031703942;9783031703928;9783031703911

Electrification is a widely explored area in many fields and is becoming a widely researched topic in tracked vehicles. Achieving efficient operation for such vehicles is crucial similar to traditional vehicles. This paper introduces a speed profile generation procedure for a dual track - series hybrid tracked vehicle with an emphasis on fuel economy and trip time optimization. A Dynamic Programming method is proposed in spatial domain, considering the properties of predefined road geometries. The study includes examination of speed and torque estimation of the sprockets, particularly during steering maneuvers. Unlike wheeled vehicles, tracked vehicles have to overcome the turning resistance moment of skid steered tracks. Taking these dynamics into account, the study investigates efficient operation, presenting over a predefined road track including straight road, inclined road and curve sections, discussing the tradeoff between fuel economy and trip time optimality. As the result of problem solution, speed profiles are generated, and operation trends of the powertrain components are discussed.

关键词： Dynamic Programing Electrified Tracked Vehicles Skid Steer Time Optimality Energy Optimality

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Ti Implant Surface State After Micro-Arc Oxidation Process 8th

Ti Implant Surface State After Micro-Arc Oxidation Process

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8th International Scientific-Technical Conference (MANUFACTURING)

作者： Adamek, Grzegorz Koper, Jeremiasz Pilch, Michal Jakubowicz, Jaroslaw Poznan Univ Tech Inst Mat Engn Jana Pawla 2 24 PL-61138 Poznan Poland Warsaw Inst Technol Lukasiewicz Res Network 133 Wolczynska PL-01919 Warsaw Poland Univ Silesia Inst Phys Bankowa 12 PL-40007 Katowice Poland

ISBN: (纸本)9783031564581;9783031564567

In this work the anodic oxidation of the titanium has been applied for its surface biofunctionalization. The surface treatment done in 2M H3PO4 + (0-1)%HFelectrolyte in broad 30-240Vpotential range results in porous morphology and hydrophilic properties. The anodic oxidation done in Micro-Arc Oxidation (MAO) conditions at 180-240 V, confirmed most attractive surface morphology for implant applications. The HF content support surface morphology changes in direction of biofunctionalization. Detected by XPS contaminations introduced during the process, especially positive in the bone regeneration phosphorus content, confirmed the usefulness of the process in dental implant applications. Finally, in terms of surface treatment, the transition from a laboratory flat surface to a real implant was presented.

关键词： Titanium Micro-Arc Oxidation Surface Treatment XPS

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Utilization of Thermal Imaging in the Evaluation of Ultrasonic Sealing of Packaging Materials 1

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33rd International Conference on Flexible Automation and Intelligent Manufacturing

作者： Pesonen, Antti Tanninen, Panu Matthews, Sami Leminen, Ville Lappeenranta Lahti Univ Technol LUT Lappeenranta 53850 Finland

ISBN: (数字)9783031744853

ISBN: (纸本)9783031744846;9783031744853

Ultrasonic sealing is a method used in packaging to create tight closures and seals using various packaging materials. One advantage of ultrasonic sealing over conventional heat sealing process is the fast and localized heat generation, which can be beneficial for many food packaging applications. Optimization of the ultrasonic process has been studied previously but thermal imaging of the sealing process is yet to be used for optimization. The distribution and behavior of heat in the sealing area is an important factor for seal quality, and there is still a need to better understand the sealing phenomena in ultrasonic sealing with different materials. In this paper, the suitability of thermal imaging for online (real-time) and offline analysis of the ultrasonic sealing of various packaging materials will be investigated. The aim is to find out how the sealing process can be analyzed and how the information from the thermal imaging can be related to the seal quality. The results showclear correlation between seal quality and thermal distribution of the seal during sealing. Possible benefits of using ultrasonic sealing over hot bar sealing can also be seen. These results could be used to increase the production speed and efficiency by optimizing the sealing parameters, and to improve the quality of the sealed packages and to develop a quality inspection tool for packaging manufacturers.

关键词： ultrasonic sealing heat sealing thermal imaging quality analysis packaging

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Laser Marking on White-Coloured Polyoxymethylene (POM) Polymer Substrate: Challenges and Perspectives 32nd

Laser Marking on White-Coloured Polyoxymethylene (POM) Polym...

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32nd International Conference on Flexible Automation and Intelligent Manufacturing

作者： Ofoegbu, Stanley Udochukwu Rosa, Paulo J. A. Fernandes, Fabio A. O. Pereira, Antonio B. Fonseca, Pedro Univ Aveiro Dept Mech Engn Ctr Mech Technol & Automat TEMA Campus Univ Santiago P-3810193 Aveiro Portugal LASI Intelligent Syst Associate Lab Aveiro Portugal Univ Aveiro Inst Elect & Informat Engn Aveiro Dept Elect Telecommun & Informat IEETA DETI P-3810193 Aveiro Portugal

ISBN: (纸本)9783031382406;9783031382413

Polyoxymethylene (POM) is a semi-crystalline engineering thermoplastic polymer employed in the production of precision parts in applications that demand good dimensional stability and frictional properties. Consistent with modern manufacturing practices, laser marking is a desirable method for marking products for branding and coding in order to enhance traceability and accountability due to its lower costs and amenability to automation. Laser making of transparent and white-coloured polymers is a technological challenge. Laser marking of polyoxymethylene substrate can be quite challenging due to its low laser absorption. In this work, white-coloured POM was laser-marked using a wide range of marking parameters, and a promising range of parameters for laser-marking of white POM substrates was identified. Results indicate that the most promising marking quality is obtained with a laser power of 30 W (100% of equipment laser output) and frequencies in the range of 30 to 80 kHz. Perspectives on improving the quality of the laser marking outputs are presented based on the understanding of the degradation behaviour of POM under the laser marking conditions employed. A new method for improving laser markability of polymers without the need of incorporating marking aids in polymer compositions is demonstrated.

关键词： Laser absorption Contrast Carbonization Foaming

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Discrete Event Simulation Model to Evaluate the Performance of the Underframe Production Line: A Case of Railcar Manufacturing 1

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33rd International Conference on Flexible Automation and Intelligent Manufacturing

作者： Nenzhelele, Tshifhiwa Trimble, J. A. Swanepoel, J. A. Kanakana-Katumba, M. G. Tshwane Univ Technol Dept Ind Engn Staatsartillerie St ZA-0183 Pretoria South Africa

ISBN: (数字)9783031744853

ISBN: (纸本)9783031744846;9783031744853

This paper presents the Discrete Event Simulation (DES) model to evaluate the performance of the proposed assembly line for a railcar manufacturing organization. The company experienced performance related problems which includes the underutilization of resources which lead to increased production cost due to the non-satisfaction of the production volume target set by the client. In this study facility layout design was identified as problem, and the studies proposed alternative layouts to address the problem. A DES model was then developed as a means of evaluating the performance of each proposed layout. The performance of the proposed layout is compared with the existing layout using the Anylogic software. The results of this study indicated that the proposed layout could improve utilization of welders and the overall productivity by 42% and 67% respectively.

关键词： Discrete event simulation productivity layout design

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A Yaw Rate Based Stability Control Tuning via Virtual Methods 16th

A Yaw Rate Based Stability Control Tuning via Virtual Method...

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16th International Symposium on Advanced Vehicle Control

作者： D'Avico, Luca Carbone, Fabio Baudry, Lucas Forni, Fabrizio Caresia, Pietro Amato, Gerardo Brembo NV Via Stezzano 87 I-24126 Stezzano BC Italy Teoresi SpA Via Perugia 24 I-10152 Turin TO Italy

ISBN: (纸本)9783031703942;9783031703928;9783031703911

Electronic Stability Control (ESC) allows to prevent safety-critical scenarios and vehicle sideslip angle estimation plays a crucial role in such applications. Time to market and safety concerns in the development and validation of such algorithms are leading the automotive industry towards virtual methods. The recent introduction of driving simulator technologies on vehicle development process allows to develop calibrate and test in advance virtual prototypes of full vehicle and its controls obtaining objective and subjective evaluation during the early stage of the vehicle development. This paper presents the methodology and results related to the development and calibration of a yaw rate based stability control grounded on a mixed-kinematic sideslip estimator. This work has been carried out leveraging tools provided by simulation platforms, scalable configurations of driving simulators and results from road tests.

关键词： Stability Control Sideslip Angle Virtual Methods Simulation Platforms Vehicle Control Vehicle State Observer

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Surrogate Modeling of Suspensions with High Stiffness Element for Real-Time Analysis Using Machine Learning 16th

Surrogate Modeling of Suspensions with High Stiffness Elemen...

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16th International Symposium on Advanced Vehicle Control

作者： Hiraga, Tojuro Shiiba, Taichi Meiji Univ Dept Mech Engn Tama Ku 1-1-1 Higashi Mita Kawasaki Kanagawa 2148571 Japan

ISBN: (纸本)9783031703942;9783031703928;9783031703911

The aim of this study is to generate a surrogate model of a suspension system with high stiffness elements for real-time analysis using machine learning. A Long Short-Term Memory networks was used as a machine learning method to generate surrogate models for three-degree-of-freedom quarter car model with a bush element. To evaluate the performance of the machine learning models, the simulation results and computation time were compared with the 3DOF model. As a result, it was confirmed that the response of the body acceleration was predicted with good accuracy by predicting the bush deformation and calculating the body acceleration based on the prediction results, instead of predicting the body acceleration directly. It was also confirmed that the machine learning model can accurately predict the body acceleration in less calculation time than the original model.

关键词： Vehicle Dynamics Suspension Machine Learning Surrogate Model Long Short-Term Memory Real-Time Calculation

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Research on mechanical Characteristics of 3D-Printed PEEK Material-Based Lattice Structures for Vertebral Implants 8th

Research on Mechanical Characteristics of 3D-Printed PEEK Ma...

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8th International Scientific-Technical Conference (MANUFACTURING)

作者： Pacurar, Razvan Negrea, Diana Sabau, Emilia Comsa, Dan Sorin Borzan, Cristina Vitkovic, Nikola Rybarczyk, Justyna Pacurar, Ancuta Tech Univ Cluj Napoca Cluj Napoca Romania Univ Nis Nish Serbia Poznan Univ Tech Poznan Poland

ISBN: (纸本)9783031564581;9783031564567

The paper is focused on the designing of one vertebral implant by using lattice structures to facilitate bone growth, implant that is aimed to be made of Polyether-ether-ketone (PEEK) material by using Fused Deposition Modeling technology. Three implant variants have been designed with lattice structures and based on the Finite element analyses and compression tests that have been conducted in case of samples that have been made of PEEK material using Fused Deposition Modeling technology it has been concluded that the "Body Centered Cubic" is optimal choice to be selected in this case from the mechanical point of view. PEEK material characteristics were analyzed through compression and hardness measurements, the experimental results that have been reached revealing lower hardness than the one of the bone. Based on the reached results, finally it has been successfully manufactured a prototype of a vertebral implant, highlighting the suitability of PEEK material for its mechanical properties for realizing of vertebral implants by Fused Deposition Modeling technology.

关键词： vertebral implant lattice structures PEEK material finite element method fused deposition modeling

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