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CFD Modelling for the Design of a Photovoltaic-Thermal Solar Panel Dedicated to Solar-Assisted Heat Pump 14th

CFD Modelling for the Design of a Photovoltaic-Thermal Solar...

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

作者： Delachaux, Valentin Daix, Steven Bennacer, Rachid Brottier, Laetitia Univ Paris Saclay LMPS CNRS ENS Paris Saclay Gif Sur Yvette France DualSun Marseille France EXTIA Ingn CFD Paris France

ISBN: (纸本)9783031666087;9783031666094

A sustainable and cost-effective solution for space heating and domestic hot water supply is a heat pump system with Photovoltaic-Thermal (PVT) collectors as its sole heat source. This paper is part of a drive to optimise the design of these collectors to go one step further. To maximise heat transfer from the ambient air at night, a better understanding of the air flows, both free and forced convection, around the panel was crucial. We developed a Computational Fluid Dynamics (CFD) model using ANSYS Fluent to replicate and analyse the thermal behaviour of PVT panels when tested on a standard indoor test bench without irradiation. It demonstrated robust predictive capacity, estimating the thermal power output within 15% of experimental data. Three designs were selected for simulation following a preliminary stage based on a 1D-2D thermal performance numerical model with hydraulic and manufacturing feasibility constraints. The validated CFD model enabled an in-depth investigation of how different design elements, such as contact points, corrugations, and fins, influence the overall thermal efficiency, temperature distribution, and heat transfer characteristics. This CFD model was used to select the optimal design among our concepts. Besides, it allowed for a better understanding of the impact of the complete PVT panel geometry on the convection airflow, of the behaviour of the test bench itself, and provided heat transfer coefficient laws as inputs for the 1D-2D model referenced above.

关键词： Solar Photovoltaic-thermal (PVT) collector Heat pump system test bench Thermal performance Free convection

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WAAM: Optimization of Start and End Zones of the Weld Bead, Case of S235JR Carbon Steel 10th

WAAM: Optimization of Start and End Zones of the Weld Bead, ...

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

作者： Fourati, Kais Jerbi, Abdessalem Trabelsi, Elyes Souissi, Slim Univ Sfax Lab Syst Electromecan LASEM Ecole Natl Ingenieurs Sfax Sfax 3038 Tunisia Univ Sfax Inst Super Gest Ind Sfax Lab Rech Optimisat Logist & Informat Decis OLID BP 2021 Sfax Tunisia Univ Sfax Inst Super Etud Technol Sfax Dept Genie Mecan BP 88 A Sfax 3099 Tunisia

ISBN: (纸本)9783031650062;9783031650079

In recent years, metal additive manufacturing has seen significant growth, offering manufacturers innovative capabilities through sequential layer deposition. Among these techniques, wire-arc additive manufacturing has emerged prominently. However, challenges persist in optimizing welding parameters to control layer dimensions accurately. One overlooked area in existing literature is the initial distortions in walls during wire arc additive manufacturing, especially in weld bead initiation and extinction zones, which can compromise component quality. While some studies propose overlaying start zones onto extinction zones to address these issues, this approach may introduce structural problems like insufficient penetration and potential cracking, affecting the final product's integrity. Our research project aims to optimize parameters at both the start and end of the weld bead to ensure consistent production of defect-free weld lines and ideal walls, particularly those made of S235JR carbon steel. Employing the Design of Experiments method, we optimized weld bead initiation and extinction zones, with a focus on measuring widths and allowances. Although initial findings are promising, further validation through additive wall manufacturing is necessary to confirm the effectiveness and reliability of the optimized parameters for high-quality metal additive manufacturing processes.

关键词： S235JR carbon steel robotic welding wire-arc additive manufacturing optimization

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An Empirical Model for Natural Beach Erosion Under Waves 23rd

An Empirical Model for Natural Beach Erosion Under Waves

引用

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

作者： Oo, Ye Htet Zhang, Hong Da Silva, Guilherme Vieira Griffith Univ Sch Engn & Built Environm Gold Coast Australia Griffith Ctr Coastal Management Gold Coast Australia

ISBN: (纸本)9789819760084;9789819760091

Short-term shoreline recession is often caused by storms wave, which can create significant beach erosion causing adverse effect to the communities and the infrastructure nearshore. Along a coastline, beaches are often the first line to defence nearshore from the adverse effects. Post storm, beach recovers itself;however, such a process is slow. The negative effects can further intensify when storms occur in a group which provide little or no opportunity for beach recovery between successive storms. Thus, the maintenance of beach is crucial for coastal defence and for economy. Due to the slow process of beach recovery, previous studies have often ignored beach recovery (within storm group) when predicting beach erosion. However, the accurate estimation of beach recovery is important since insufficient recovery between storms is a major reason for potentially increased beach vulnerability. In this study, the daily beach accretion (recovery) rate is determined by (i) averaging total beach accreted volume to the total number of days between a pair of measured profile and (ii) to eliminate irregular beach accretion (e.g. accretion due to beach nourishment), the daily wave power is applied as a reference between each pair of beach profile. The medium daily beach accretion rate is then distributed evenly to the post-storm profile (from upper beach to pre-storm offshore bar) after each storm (within a storm group). The results showed that current empirical model can minimize the over-estimation of beach erosion volume, which traditionally has ignored and mimics the natural beach erosion system.

关键词： Erosion Recovery rate Accretion XBeach

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Testing Urban Interaction Scenarios Between Automated Vehicles and Vulnerable Road Users Using a Vehicle-in-The-Loop Test Bench and a Motion Laboratory 16th

Testing Urban Interaction Scenarios Between Automated Vehicl...

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16th International Symposium on Advanced Vehicle Control

作者： Kaisers, Michael Otto, Lisa Marie Mueller, Steffen Hartwecker, Andre Schyr, Christian Tech Univ Berlin Chair Automot Engn Berlin Germany AVL Deutschland GmbH Wiesbaden Germany

ISBN: (纸本)9783031703942;9783031703928;9783031703911

For testing and analyzing urban vehicle-pedestrian or vehicle-bicyclist interactions as realistically and safely as possible, new types of test environments are required. This paper presents and analyzes a test environment in which a Vehicle-in-the-Loop test bench is combined with a motion laboratory. In this test setup, a real automated vehicle can interact with a human pedestrian or cyclist in a virtual test field in the same way as in real road traffic. Employing a walking platform ensures that the pedestrian's range of movement is not restricted during the test. This test environment is used to stimulate vehicle perception with a pedestrian avatar animated by a test subject. The test results are compared with measurements taken with a human pedestrian in reality, and strengths and weaknesses of the approach are discussed.

关键词： Advanced Driver Assistance Systems Automated Driving Systems Testing and Validation Motion Capture Vehicle-in-the-Loop Mixed Reality

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Complex and Big Data Handling and Monitoring Through Machine Learning Towards Digital-Twin in High Precision Manufacturing 1st

Complex and Big Data Handling and Monitoring Through Machine...

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1st European Symposium on Artificial Intelligence in Manufacturing (ESAIM)

作者： Grasso, Marco Fogliazza, Giuseppe Colosimo, Bianca Maria Politecn Milan Dept Mech Engn Via La Masa 1 I-20156 Milan Italy MCE Solut Via FeG Celaschi 19 I-29020 Vigolzone PC Italy

ISBN: (纸本)9783031574955;9783031574962

The digital transition faced in the Industry 4.0 framework is reshaping the complexity and volume of data used for discrete manufacturing quality monitoring and modelling. Advanced manufacturing methods are used to produce more and more complex products, while the wide adoption of in-line sensing tools enable big and fast streams of sensor data while the part is being produced. The result is a novel level of quality data complexity, which gives rise to industrial challenges, namely the lack of appropriate statistical process monitoring methods, the difficulty to manage such high dimensionality of in-process and post-process data, and the difficulty to deal with multi-sensor data stream in an efficient and effective way. This paper presents novel solutions based on machine learning (ML) algorithms suitable to fuse and make sense of big multi-channel data gathered in discrete manufacturing applications to anticipate the detection of anomalies, and to enhance the quality of the products, towards the implementation of digital-twin solution in production environments. A real case study is presented in the field of milling operations via flexible systems. ML methods are compared against benchmark statistical techniques to highlight when and to what extent the actual ML potentials may help bridge the gap between scientific research and industrial deployment, pointing out current barriers and challenges in real production environments.

关键词： Industry 4.0 multichannel signals Recurrent Neural Network process monitoring digital twin

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Determination of the Loss Behavior of Wheel Bearings Under Real Driving Conditions 16th

Determination of the Loss Behavior of Wheel Bearings Under R...

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16th International Symposium on Advanced Vehicle Control

作者： Hartmann, Lukas Ohms, Leon Rebesberger, Ron Brandes, Gerrit Henze, Roman Tech Univ Carolo Wilhelmina Braunschweig Inst Automot Engn Braunschweig Germany

ISBN: (纸本)9783031703942;9783031703928;9783031703911

The characterization of component losses is typically conducted on dedicated test benches with the objective of enhancing component efficiency. Nevertheless, obtaining precise measurements of the actual loss contributions of components during real-world vehicle operations is often challenging. This challenge particularly pertains to wheel bearings, whose loss characteristics are efficiently delineated through the generation of efficiency maps on test benches at the Institute of Automotive engineering. This submission presents a methodology for establishing these efficiency maps and introduces a developed methodology that enables the transfer of loss behavior from the component test into real-world driving conditions. Subsequently, the power losses are quantified across distinct driving domains, including urban, rural, and highway conditions. The outcomes of this methodology are contrasted with the losses observed on the test benches in order to identify potential avenues for reducing the losses of wheel bearings. Furthermore, the methodology is applied to homologation-relevant vehicle test benches with the objective of comparing the power losses under these conditions with real-world vehicle operations.

关键词： Testing and Validation Suspension Powertrain Energy losses

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Numerical Investigation of Shearing Processes on the Deformation Behavior of Elasto-Plastic Fe-TiB2 Composite 10th

Numerical Investigation of Shearing Processes on the Deforma...

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

作者： Jrad, Hanen Bouhamed, Abir Dammak, Manel Wali, Mondher Dammak, Fakhreddine Univ Sfax Natl Engn Sch Sfax LEE Lab Sfax Tunisia Univ Gabes Inst Super Sci Appl & Technol Gabes Rue Omar Ibn El Khattab Gabes 6072 Tunisia Univ Sousse Ecole Super Sci & Technol Hammam Sousse Rue Lamine Abassi Hammam Sousse 411 Tunisia

ISBN: (纸本)9783031650062;9783031650079

The progress in sheet metal forming owes a lot to cutting-edge tools, especially in the vast field of finite element simulations. These simulations are a game-changer for delving into numerical investigations. To ensure the reliability and quality of results, it's crucial to accurately model material behavior throughout the forming process. This involves characterizing and determining the material properties under scrutiny and translating them into numerical material models. In the business of creating a ferritic steel matrix reinforced with brittle ceramic particles like TiB2, the need to know how these materials behave under different loads is necessary. This understanding is gold when it comes to modeling their mechanical properties and predicting how they'll shape up. This study describes new ground by applying a 12% TiB2 content Fe-TiB2 composite to the shearing process. A user interface material subroutine (VUMAT) is performed. The focal point of this investigation resides in the anticipation of how specific pivotal process parameters, such as the thickness of the blank and the applied holding load, influence the quality attributes of the final product. Additionally, the objective is to show the shearing deformation capabilities of Fe-TiB2 composite and to represent its performance.

关键词： Iron-Titanium Diboride composite shearing process User Material subroutine (UMAT) elastoplastic framework

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Optimal Braking and Steering Control Under Split Friction on Curved Roads 16th

Optimal Braking and Steering Control Under Split Friction on...

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16th International Symposium on Advanced Vehicle Control

作者： Karyotakis, Ektor Yang, Derong Jonasson, Mats Sjoberg, Jonas Volvo Car Corp Vehicle Energy & Mot Control S-40531 Gothenburg Sweden Chalmers Univ Technol Dept Elect Engn S-41296 Gothenburg Sweden Chalmers Univ Technol Dept Maritime & Mech Engn S-41296 Gothenburg Sweden

ISBN: (纸本)9783031703942;9783031703928;9783031703911

This paper aims to maximize deceleration on split friction roads by combining steering and individual wheel braking. For this, a previously tested optimization problem is adapted to curved roads. The optimal brake force and steering allocation is investigated as a function of the split friction asymmetry. Results show that low friction is more detrimental to maximum braking on the inner side of the curve due to load transfer. Finally, the paper showcases a control strategy for braking on split friction, which enhances safety and manoeuvrability in critical split friction scenarios.

关键词： split friction optimization cornering curve braking

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An Image Processing Approach for Morphology Characterization of Serration in Ti-6Al-7Nb Chip Sliding Surface 32nd

An Image Processing Approach for Morphology Characterization...

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32nd International Conference on Flexible Automation and Intelligent Manufacturing

作者： Horovistiz, Ana Carvalho, Silvia Davim, J. P. Univ Aveiro Aveiro Portugal

ISBN: (纸本)9783031382406;9783031382413

Titanium alloys, namely Ti-6Al-7Nb, have found growing importance in biomedical industry applications. CNC machining plays a decisive role in the production of these components. Thiswork presents amethod for the classification of shape and evaluation of morphology and size of Ti-6Al-7Nb segmented chip, turned with different cutting parameters. The method is based on the association of optical microscopy and digital image processing and analysis. Theoretical morphological data have been comparedwith the experimental image data obtained by digital microscopy. There was a remarkable shift of teeth morphology by increasing the cutting speed from 30 to 90 m/min. This suggests that for the cutting conditions tested for Ti-6Al-7Nb, increasing cutting speed will intensify the thermal effect responsible for the formation of narrow deformation zones which will promote the appearance of tooth morphologies. The advantage of the approach is its effectiveness in inspecting the evolution of chip segmentation geometry during the machining process.

关键词： Chip serration Titanium alloys Digital image processing and analysis

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Towards Automated Driving: Findings and Comparison with ADAS 16th

Towards Automated Driving: Findings and Comparison with ADAS

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16th International Symposium on Advanced Vehicle Control

作者： Dona, Riccardo Mattas, Konstantinos Albano, Giovanni Vass, Sandor Ciuffo, Biagio European Commiss Joint Res Ctr I-21027 Ispra VA Italy Piksel Italia Milan Italy

ISBN: (纸本)9783031703942;9783031703928;9783031703911

The present contribution provides preliminary empirical findings concerning the first-in-literature independent experimental characterization of a commercially viable automated driving system in Europe. In particular, the paper reports on the testing campaign involving a type-approved Automated Lane Keeping System (ALKS) equipped vehicle and its comparison with the comparable driving assistance feature technology from the same vehicle: the Adaptive Cruise Control (ACC) system. The results suggest that the ALKS shows substantially enhanced performances with respect to ACC. In particular, both the string stability metrics and the reaction time show remarkable improvements. Additionally, the increased stability is not obtained via resorting to a significantly higher time gap which further motivates that string stable car-following is indeed feasible.

关键词： Adaptive Cruise Control Automated Lane Keeping System Driving Automation

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