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

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Robot-Based Inspection of Freeform Components: Process Analysis and Challenges in Using a Lateral Scanning WLI 32nd

Robot-Based Inspection of Freeform Components: Process Analy...

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32nd International Conference on Flexible Automation and Intelligent Manufacturing

作者： Ehrbar, Jessica Schoepflin, Daniel Schueppstuhl, Thorsten Hamburg Univ Technol Inst Aircraft Prod Technol Denickestr 17 D-21073 Hamburg Germany

ISBN: (纸本)9783031382406;9783031382413

Vertical scanning white light interferometry is nowadays successfully used for automated inspection of combustion chambers in aircraft engines. Although they provide high-accuracy data, white light interferometers have the disadvantage of being comparatively slow sensors due to their small field of view and vibrational sensitivity. Using a lateral scanning white light interferometer instead of a vertical scanning one offers a reduction in inspection times by scanning larger areas at once. At the same time using the lateral scanning setup creates new challenges for the inspection process. In this paper, considering a fan blade of an aircraft engine as an example, a possible inspection setup is shown for reference and the challenges regarding the inspection process are investigated. Existing solutions for similar problems are analysed for their applicability. The biggest remaining challenge is seen in the path planning for the inspection, since generating a minimal number of viewpoints is critical for efficiently using a lateral scanning white light interferometer.

关键词： robot guided path planning inspection system

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Experimental Investigations of Phase Change Materials (PCM) for Electronic Cooling Application Using Heat Sinks 14th

Experimental Investigations of Phase Change Materials (PCM) ...

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

作者： Shajahan, Mohamed Iqbal Mallela, Gandhi Lenka, Bhaskar Chandra Aradhyula, Vinay Kumar Panneerselvam, Padmanathan Vel Tech Rangaraj An Dr Sagunthala R&D Inst Sci & Dept Mech Engn Chennai 600062 Tamil Nadu India Indian Inst Informat Technol Design & Mfg Kanchee Dept Mech Engn Chennai 600127 Tamil Nadu India Vellore Inst Technol Sch Mech Engn Vellore Tamil Nadu India

ISBN: (纸本)9783031666087;9783031666094

The overheating of electronic devices and space cooling needs to be addressed through the heat storage materials. The latent heat storage is accomplished by many organic and inorganic phase change materials. The three various heat sinks having the volume of 6 cm x 6 cm x 2.5 cm, namely without fin, hexagonal fin and circular fin were made by CNC machining process with Aluminium material. The experimental process consists of aluminium heater, auto transformer, PI&D instrument in order to set the required power and temperature. The phase change materials namely GR42 heat storage granulate consist of a blend of approximately 35% RT42 and 65% diatomaceous earth. The power supplied to the 5 cm x 5 cm aluminium flat plate heater through auto transformer varying 4 W, 8 W, and 12 W. A constant volume fraction of 13% of circular fin heat sink and 16% hexagonal fin heat sink, comparative analysis of three types of heat sinks circular fins, hexagonal fins, and those integrated with phase change materials, it was observed that both the circular and hexagonal fin heat sinks with PCMs exhibited superior thermal performance compared to heat sinks without fins. During the experimentation phase, a constant power supply of 8W was applied. The heat absorbing process began, and the latent heat phase commenced at 41 degrees C, eventually increasing to 45 degrees C. Subsequently, the sensible heat also showed a gradual rise, reaching the maximum operating temperature of 70 degrees C. The performance of a hexagonal fin heat sink in terms of charging and discharging was notably 35% superior when compared to a heat sink without fins, especially at an 8 W power input. This enhanced performance was attributed to the internal generation of high pressure within the paraffin, optimizing heat transfer dynamics and more surface area of the fin.

关键词： Phase Change Materials GR42 Heat Sink Electronic Cooling Latent Heat Storage

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Deep Learning Based Automatic Porosity Detection of Laser Powder Bed Fusion Additive Manufacturing 32nd

Deep Learning Based Automatic Porosity Detection of Laser Po...

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32nd International Conference on Flexible Automation and Intelligent Manufacturing

作者： Ibn Mohsin, Syed Farhang, Behzad Wang, Peng Yang, Yiran Shayesteh, Narges Badurdeen, Fazleena Univ Kentucky Lexington KY 40506 USA Univ Texas Arlington Arlington TX 76010 USA

ISBN: (纸本)9783031382406;9783031382413

Laser Powder Bed Fusion (LPBF) is a widely utilized additive manufacturing process. Despite its popularity, LPBF has been found to have limitations in terms of the reliability and repeatability of its parts. To address these limitations, a deep learning model based on You Only Look Once (YOLO) was adapted to automate the detection of defect areas from scanning electron microscopic images of LPBF-manufactured parts. The data on the defect areas are then integrated into an Artificial Neural Network to correlate the process parameters with defects. The results show that the development of defects is stochastic in nature with respect to the input process parameters. The high variability of defects generated from the same process parameters makes it difficult to reliably predict the quality of the parts using only a process data-driven approach. This highlights the importance of in-situ monitoring of the system for reliable prediction of part quality.

关键词： Additive Manufacturing Machine Learning Powder Bed Fusion

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Multi-criteria Decision-Making in Sustainable Manufacturing: Green Strategies Analysis in the Automotive Industry 1

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33rd International Conference on Flexible Automation and Intelligent Manufacturing

作者： Pereira, Maria Teresa Fernandes, Filipa Maria Lellis Moreira, Miguel Angelo Oliveira, Marisa Pinto, Viviana Correia Polytech Univ Porto Porto Sch Engn ISEP P-4200072 Porto Portugal INEGI Associate Lab Energy Transports & Aerosp LAETA P-4200465 Porto Portugal Fluminense Fed Univ BR-24210346 Rio De Janeiro Brazil

ISBN: (数字)9783031744853

ISBN: (纸本)9783031744846;9783031744853

The sustainable manufacturing represents a sustainable development model whose main objective is to minimize waste and pollution by promoting the extension of the useful life of materials through reuse, recovery, repair, and recycling. The importance of strategic decisions in industrial environments to achieve the circular economy is emphasized, highlighting the usefulness of multi-criteria methodologies. In this scenario, a multi-criteria model using the Analytic Hierarchy Process (AHP) method was developed to evaluate sustainable manufacturing strategies in the automotive industry, specifically in the painting section. Strategic alternatives included usingwater-based paints, robotization, and alternative energy sources to reduce resources and waste. The results obtained allowed the establishment of a classification for the sustainable manufacturing strategies to be applied in the painting section, helping the company to understand the impact of these measures in promoting sustainability. A sensitivity analysis of the results obtained through the AHP method was also performed, which allows us to understand the amplitudes of variation necessary for the positions to change.

关键词： Multi-Criteria Decision Analysis Sustainable Manufacturing Automotive Industry

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Investigating Reversing Motion of Truck-Semitrailer Along Clothoid Curve 16th

Investigating Reversing Motion of Truck-Semitrailer Along Cl...

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16th International Symposium on Advanced Vehicle Control

作者： Mihalyi, Levente Takacs, Denes Budapest Univ Technol & Econ Fac Mech Engn Dept Appl Mech Muegyet Rkp 3 H-1111 Budapest Hungary HUN REN BME Dynam Machines Res Grp Muegyet Rkp 3 H-1111 Budapest Hungary

ISBN: (纸本)9783031703942;9783031703928;9783031703911

The focus of the research is on the most common transport vehicle, the truck-semitrailer combination. A single-track kinematic model is used, supplemented by the dynamics of the steering system, to design a linear state feedback controller for the low-speed path-following problem in reverse. Despite the significant time delay considered in our study, the linear stability of the system is ensured, even for complicated maneuvers. The advantages of the adaptive gain tuning method are presented based on simulations of the commonly used 90-degree alley dock.

关键词： truck-semitrailer reverse maneuvering time delay path-following

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Instability in Annular Sliding Couette Flow with Variable-Viscosity and Viscous Dissipation 14th

Instability in Annular Sliding Couette Flow with Variable-Vi...

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

作者： Khan, A. Chokshi, P. IIT Delhi Dept Chem Engn New Delhi 110016 India

ISBN: (纸本)9783031666087;9783031666094

The study focuses on investigating the combined effect of viscous heating and viscous dissipation in annular sliding Couette flow (ASCF) between two coaxial circular cylinders, where the inner cylinder undergoes axial motion while the outer cylinder is at rest. Viscosity varies exponentially with temperature and is modelled using two different laws;Arrhenius-type law and Nahme-type law. Temporal linear stability analysis is employed to explore instability characteristics. The stability of ASCF is influenced by parameters including the Reynolds number, radius ratio (the ratio of the inner cylinder radius to the outer cylinder radius), Brinkman number, activation energy parameter, and Prandtl number. Existing literature (Deguchi & Nagata, J. Fluid Mech., vol. 678, 2011, pp. 156-178) establishes the stability of sliding annular Couette flows with uniform viscosity for all radius ratio values exceeding 0.1415. However, the current analysis reported that a small deviation in the fluid's viscosity induces flow instability for all values of the radius ratio. Additionally, the analysis highlights the destabilizing impact of the radius ratio on the flow instability. The Arrhenius-type model demonstrates greater stability compared to the Nahme-type model. An increase in the Brinkman number and activation energy parameter makes the system more unstable.

关键词： Annular Couette Flow Linear Stability Analysis Variable Viscosity Viscous Dissipation

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SMD Components Recycling Procedure for Reuse in E-Textiles with Risk Analysis 32nd

SMD Components Recycling Procedure for Reuse in E-Textiles w...

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32nd International Conference on Flexible Automation and Intelligent Manufacturing

作者： Hirman, Martin Benesova, Andrea Navratil, Jiri Steiner, Frantisek Tupa, Jiri Univ West Bohemia Dept Mat & Technol Fac Elect Engn Plzen Czech Republic

ISBN: (纸本)9783031381645;9783031381652

This paper deals remanufacturing method for the reuse of adhesive bonded SMD components on stretchable textile ribbons for integration in e-textiles and its risk analysis. Nowadays, e-waste is an increasing problem in the world, and reducing this problem by using circular economy principles and reusing components is beneficial. In our research, the samples were submitted for accelerated ageing by dry heat and their quality was evaluated by the electrical resistance measurement. The recycling procedure was realized four times, and the mentioned risk analysis was realized before and after the experiment. The two main goals of our research were determined. The first goal was to demonstrate the applicability of our recycling procedure and the quality of samples with reused components after accelerated climatic ageing by dry heat. The second goal was to create and verify the risk analysis of our method and identify actions to mitigate the high and very high risks. The experiment showed that our recycling method is applicable several times without decreasing product quality. The results also present that reused samples are functional like new even after samples dry heat ageing. The risk analysis after the experiment showed seven high risks, which is necessary to solve primarily. These risk factors and actions to mitigate them are described in the paper.

关键词： Recycling procedure e-textiles risk analysis circular economy SMD components reuse

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The Early-Warning System to Predict Sediment Flux in the Mountain Basin During Typhoon Events 23rd

The Early-Warning System to Predict Sediment Flux in the Mou...

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

作者： Ho, Hao-Che Natl Taiwan Univ Dept Civil Engn Taipei 10617 Taiwan

ISBN: (纸本)9789819760084;9789819760091

The watershed sedimentation could be determined as the severe natural disaster source. The differences between the sediment yield estimation and the real situation are large due to the inadequacy of on-site measurement data. A robust early-warning approach that encloses both the physical mechanism and statistical analysis was proposed to predict the sedimentation and improve the deficit on the current methods. This three-phase early-warning system includes, Phase I (data collection), Phase II (data generation), and Phase III (AI prediction). In Phase I, HEC-HMS was applied to transform the measured precipitation data to the flow discharge from different sub-catchments. The empirical formulas of landslide volume and soil erosion were then adopted to provide reasonable boundary conditions to Phase II. A 2D model, SRH-2D, was verified with on-site data and conducted to obtain simulated data for the temporal variation of the sediment flux with different storm events. The simulated data can be the input for Phase III to train and test the artificial neural networks. Three prediction models presented a good performance from 1-h to 6-h lead time comparing to the observation. Even though the relatively poor performance was shown in the higher sediment discharge and the difference was gradually increasing with the longer forecast lead time, the prediction models still provide the proper prediction trend, especially the forecast lead time from 1-h to 3-h. This approach shows a significant improvement on the sediment prediction due to the sufficient simulated data, and can be well-applied to better manage sediment problems in advance.

关键词： Multi-phase approach Early-warning system ANNs Typhoon events Sediment flux

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Study of Palladium Reduction and Its Effect on the Electroless Nickel Coating Adhesion on Carbon-Fibre Reinforced Polyetherimide Composite 3rd

Study of Palladium Reduction and Its Effect on the Electrole...

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3rd International Conference on Advanced Surface Enhancement (INCASE)

作者： Huang, Zhaohong Zhou, Yujie Xie, Hong 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

Polymer composite is frequently coated with metals by various metallization processes, one of which is electroless nickel (EN) plating process. EN plating has been accepted by industry as a reliable method to produce the high quality, bright reflective surfaces. Aesthetically, the well-established bright metal finishes also offer plastic components with important functional advantages, such as wear resistance and hygienic properties. To improve EN coating adhesion on the polymer composite, chemical etching is used as the pre-treatment method prior to EN coating. However, the immediate consequence of the chemical etching is the exposure of the composite carbon fibre, leading to poor surface finish. To overcome the challenges, chemical-etching-free pre-treatment methods are desirable. In this paper, the key factors controlling the adhesion of EN coating on carbon fibre reinforced polyetherimide (CF-PEI) were investigated. Surface chemistry at different treatment stages was studied by X-ray photoelectron spectroscopy (XPS) analysis. It is found that reducing palladium (Pd) ions into Pd atoms on the composite surface takes a critical role to develop a good adhesion of EN coating to CF-PEI composite surface. When hypophosphite is used as a reducing agent, elevated temperature increases the density of catalytic Pd metal sites. With a stronger reducing agent sodium borohydride (NaBH4), more adsorbed Pd ions can be reduced at room temperature than the high temperature hypophosphite. Even though NaBH4 is used, there is still more than 30% adsorbed Pd ions yet to be reduced.

关键词： Plastic plating Metallization of polymer Surface activation Electroless nickel plating Coating adhesion

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Integrating Remanufactured and 3D Parts in Asset Maintenance Improvement 7th

Integrating Remanufactured and 3D Parts in Asset Maintenance...

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7th International Workshop on Autonomous Remanufacturing (IWAR)

作者： Wakiru, James Muchiri, Peter Dedan Kimathi Univ Technol Nyeri Kenya

ISBN: (纸本)9783031526480;9783031526497

This research aims to optimize asset performance by integrating spare parts replacement, remanufactured parts, 3D printed parts, and repair, corrective, and preventive maintenance. The study reviews the current asset maintenance practices and proposes a framework for integrating various maintenance and spare parts strategies to achieve maximum asset performance. The proposed framework considers the asset's criticality, the availability of spare parts, and the effectiveness of each maintenance strategy in influencing the reliability and useful life of the spare parts utilized. The research also explores the potential of using 3D printing technology to produce spare parts and remanufacturing as a sustainable alternative to buying new parts. A case study is conducted to demonstrate the effectiveness of the proposed framework in optimizing asset performance. The results show that integrating the various maintenance strategies can save significant maintenance time and improve asset performance. The study concludes that a comprehensive approach to asset maintenance that considers all available maintenance and spare parts strategies is essential for achieving maximum asset performance, reducing downtime, and improving the overall efficiency of asset management.

关键词： Remanufacturing Maintenance Spare Inventory 3D

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