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Comparative Analysis of VGGish and YAMNet Models forWelding Defect Detection 1

引用

8th International Scientific-Technical Conference (MANUFACTURING)

作者： Avila, Alejandra Pinzon, Cesar Technol Univ Panama Cent Campus Dr Victor Levi Sasso Panama City Panama Lab Computat & Appl Theoret Mech Cent Campus Dr Victor Levi SassoBldg 1 Panama City Panama

ISBN: (数字)9783031564673

ISBN: (纸本)9783031564697;9783031564673

Manufacturing, especially in welding, requires advanced tools to detect and classify sounds associated with the process that may lead to defects. This study investigates the applicability of pre-trained convolutional neural network models known as VGGish (Visual Geometry Group) and YAMNet (Yet Another Mixture-of-Experts Network) to analyze and improve welding defect detection. The methodology involved data collection and processing, as well as training and evaluation of the models in terms of accuracy and inference time. To determine the evaluation parameters, songs from two rock bands with similar styles were used to extract audio information, considering the audio amplitude, rhythm (pattern), and tempo (speed) of the songs. Additionally, the behavior of the audio was visualized using a spectrogram, which illustrates the variation of sound over time. The objective is to understand the acoustic structure of the songs, which can be useful for pattern detection and analysis of audio signals. It is expected that, after applying the pre-trained models VGGish and YAMNet in predicting audios from a custom model trained with these songs, one of the two pre-trained models will demonstrate superior performance in terms of accuracy and inference time. This denotes a pre-trained model with better probabilities, which can be further used in other research for welding audio, aiding in the development of the acoustic monitoring tool in manufacturing, especially within the welding process. This contributes to the efficient identification of defects and process optimization.

关键词： Manufacturing Audio Signal Surface Discontinuities

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Finite Element Approach to the Seat Vibration Response Assessment 15th

Finite Element Approach to the Seat Vibration Response Asses...

引用

15th International Conference on Vibration Problems (ICoVP)

作者： Skoda, Jan Cirkl, David Lufinka, Ales Tech Univ Liberec Studentska 2 Liberec 46117 Czech Republic

ISBN: (纸本)9789819959211;9789819959228

This article deals with evaluation of acceleration transfer function of a car seat in vertical direction. In the first part of the article this transfer function is calculated by means of FEM considering the fact that the seat is loaded by a rigid body represented by a part of EuroSID2 dummy. The second part of the article provides an experimental point of view on this problem. The acceleration transfer function was measured by means of 6 DOF platforms with two persons.

关键词： Vehicle seat Human-seat system FEA Contact pressure Human-seat frequency response Ride comfort

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A Readiness Level Assessment Framework for Zero Defect Manufacturing (ZDM) 32nd

A Readiness Level Assessment Framework for Zero Defect Manuf...

引用

32nd International Conference on Flexible Automation and Intelligent Manufacturing

作者： Psarommatis, Foivos May, Gokan Azamfirei, Victor Magnanini, Maria Chiara Powell, Daryl Univ Oslo SIRIUS Ctr Gaustadalleen 23B N-0373 Oslo Norway Univ North Florida Dept Mech Engn Jacksonville FL USA Malardalen Univ Sch Innovat Eskilstuna Sweden Politecn Milan Milan Italy SINTEF Mfg AS Raufoss Norway

ISBN: (纸本)9783031381645;9783031381652

In this study, a comprehensive framework for assessing the readiness of production systems for Zero Defect Manufacturing (ZDM) has been developed and presented. The framework includes four pillars of ZDM readiness, namely Personnel, Procedures, Infrastructure, and Company Culture, to help companies understand their level of readiness and plan for successful implementation of ZDM. We argue that a manufacturing company will be better equipped to embrace ZDM if it performs well in these four areas. We propose a tool that uses yes/no questionnaires to assess a manufacturing system's readiness for ZDM. The results of the questionnaire will objectively show the true level of cultural readiness for ZDM adoption, and the level of investment required for implementation will depend on the level of readiness. This tool can help companies gain a clear understanding of their readiness and create a plan for implementing ZDM. Overall, our framework and tool can help manufacturers improve the quality of their products and be ready for ZDM adoption.

关键词： Zero Defect Manufacturing ZDM readiness quality assurance

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The CrossLog System Concept and Architecture 32nd

The CrossLog System Concept and Architecture

引用

32nd International Conference on Flexible Automation and Intelligent Manufacturing

作者： Silva, Manuel F. Rebelo, Paulo M. Sobreira, Heber Ribeiro, Fillipe INESC TEC Rua Dr Roberto Frias P-4200465 Porto Portugal Inst Politecn Porto Inst Super Engn Porto Rua Dr Antonio Bernardino de Almeida 431 P-4249015 Porto Portugal JPM Ind P-3731901 Vale De Cambra Portugal

ISBN: (纸本)9783031381645;9783031381652

Logistics chains are being increasingly developed due to several factors, among which the exponential growth of e-commerce. Crossdocking is a logistics strategy used by several companies from varied economic sectors, applied in warehouses and distribution centres. In this context, it is the objective of the "CrossLog - Automatic Mixed-Palletizing for Crossdocking Logistics Centers" Project, to investigate and study an automated and collaborative crossdocking system, capable of moving and managing the flow of products within the warehouse in the fastest and safest way. In its scope, this paper describes the concept and architecture envisioned for the crossdocking system developed in the scope of the CrossLog Project. One of its main distinguishing characteristics is the use of Autonomous Mobile Robots for performing much of the operations traditionally performed by human operators in today's logistics centres.

关键词： Logistics Crossdocking Automated Mobile Robot

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Vision-Based Ladle Monitoring System for Steel Factories 1st

Vision-Based Ladle Monitoring System for Steel Factories

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

作者： Selim, Mohamed Lopez de Uralde, Pablo Mata, Jon Gorostegui-Colinas, Eider Chicote, Beatriz Pagani, Alain Stricker, Didier DFKI GmbH German Res Ctr Artificial Intelligence Kaiserslautern Germany Lortek Ordizia Spain

ISBN: (纸本)9783031574955;9783031574962

This paper presents a vision-based ladle monitoring system for steel factories, consisting of two modules: one for ladle surface temperature analysis using thermal cameras and another for deep learning-based detection and recognition of ladle identification numbers. The first module monitors ladle thermal behavior by capturing high-resolution thermal images and employing advanced image analysis techniques. This enhances safety and efficiency in steel production. The second module focuses on digit recognition on the ladle surface, providing crucial identification and tracking information. A robust deep learning model trained on a large dataset of thermal camera images achieves high accuracy in ladle identification. The proposed system integrates thermal cameras and advanced image analysis techniques, offering real-time monitoring, early anomaly detection, and accurate ladle identification. Experimental evaluations demonstrate its effectiveness, indicating its potential for practical implementation in steel factory environments.

关键词： Ladle monitoring Thermal cameras Deep Learning Steel manufacturing

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A Method to Extract the Elastoplastic Properties of the Constituent Layers of Multilayer Coatings 10th

A Method to Extract the Elastoplastic Properties of the Cons...

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

作者： Ben Ammar, Yamen Aouadi, Khalil Bouchoucha, Faker Nouveau, Corinne Besnard, Aurelien Montagne, Alex Univ Carthage Inst Preparatoire Etud Ingenieur Nabeul Lab Rech LR18ES45 Campus Univ Mrezga 8000 Tunisia Univ Carthage Tunisia Polytech Sch Appl Mech & Syst Res Lab LR03ES06 Rue El KhawarizmiBp 743 La Marsa 2078 Tunisia Moroccan Fdn Adv Sci Innovat & Res MAScIR Rabat Design Ctr Rue Mohammed El Jazouli Rabat 10100 Morocco HESAM Univ Arts & Metiers Inst Technol LABOMAP UBFC F-71250 Cluny France Arts & Metiers Inst Technol MSMP 8 Rue Blvd Louis Xiv F-59046 Lille France

ISBN: (纸本)9783031650062;9783031650079

This paper presents an approach to characterize the elastoplastic properties of the distinct layers, constituting multilayer coating. The proposed procedure utilizes nanoindentation load-displacement (P-h) curves and a non linear least squares fitting analysis to extract the elastoplastic properties of each layer in the multilayer coating. The accuracy of the optimization results is achieved by choosing initial guess parameters closer to the target values using the modified Jonsson and Hogmark model. The methodology is validated on a CrN/CrAlN multilayer coating systems with varying layer thicknesses from 1 to 0.5 mu m, from which the optimal elastoplastic properties: Young's modulus (E), yield stress (sigma(y)), and strain hardening exponent (n) of each individual layer were determined. The results show good agreement between the simulated and the experimental (P-h) curves. Furthermore, the results revealed a reduction in the material parameters (E, H and sigma(Y)) of the constituent layers when the layer thickness decreases. These findings suggest that decreasing the coating layer thickness lead to an increase in the plastic deformation within the coatings, which reduces the stress concentration in this area and improves the adhesion properties of CrN/CrAlN multilayer coatings.

关键词： Instrumented-indentation testing Elastoplastic properties finite element modeling

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Evaluation of Hydrogen Production Feasibility Utilizing System Integrated Modular Advanced Reactor (SMART) in Saudi Arabia

Evaluation of Hydrogen Production Feasibility Utilizing Syst...

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Saudi International Conference on Nuclear Power engineering (SCOPE)

作者： Al Attas, Hashim Al Sheikh, Saud Al Waznah, Aban Al Jafri, Qusa King Abdullah City Atom & Renewable Energy Riyadh Saudi Arabia

ISBN: (纸本)9783031643613;9783031643620

Worldwide, the demand of hydrogen has grown by threefold since 1975. Hydrogen is mainly produced from fossil fuels, due to lower costs compared to other production alternatives. Consequently, this industry resulted in the emission of about 830 million tons of carbon dioxide per year. In its effort to tackle this global issue, Saudi Arabia is considering the utilization of nuclear energy to power the production of hydrogen as part of a push by the world's largest exporter of crude to diversify its economy away from hydrocarbons, and fulfill its net-zero target. Hence, this paper presents a Techno-Economic model for hydrogen production using System-Integrated Modular Advanced Reactor (SMART) as a clean alternative to reduce dependence on fossil fuels and mitigate its carbon footprint in Saudi Arabia. SMART is an advanced pressurized water reactor that has been developed based on proven technologies, with 365MWthermal capacity co-owned by the Kingdom. The reactor has an integral steam generators and advanced safety features designed for electricity generation and thermal applications. The paper identifies the key factors that could affect the competitiveness of SMART for hydrogen production, through estimating the associated capital and operational expenses while considering the impact of various factors such as electricity prices, fuel costs, and carbon prices. The tool used for this analysis is "Hydrogen Economic Evaluation Program (HEEP)" developed by International Atomic Energy Agency (IAEA), which includes numerous options for hydrogen generation. The Discounted Cash Flow (DCF) approach is the foundation of the mathematical modeling used in HEEP to determine the levelized cost of hydrogen at a certain discount rate. The findings of this paper identifies the key factors that could affect the competitiveness of small nuclear reactors for hydrogen production, providing valuable insights for future research and development in this area.

关键词： SMART Techno-economic HEEP Discounted Cash Flow (DCF) Nuclear Hydrogen

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Estimation of Maintenance Dredging Quantity Using Numerical Modeling Technique in Thane Creek 23rd

Estimation of Maintenance Dredging Quantity Using Numerical ...

引用

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

作者： Gavali, Mandar Bharat Ramakrishnan, Balaji Indian Inst Technol Dept Civil Engn Mumbai Maharashtra India

ISBN: (纸本)9789819760084;9789819760091

Mumbai being largest commercial city needs to be having multiple transport systems for goods and passengers. Thane Creek is well-capable of providing water transport from tip of Mumbai to Kasheli, but long-term feasibility of navigation channel of this waterway needs to be investigated as it encounters with heavy siltation. In this study, an attempt has been made to simulate the annual morphological changes occurring within Thane Creek, using a process-based hydrodynamic and morphological model called Delft3D. Initially hydrodynamic model is set-up, with its domain extending till offshore with astronomical tide forcing. Model coefficients are well-calibrated and validated with in situ measurement data captured by IITB. Morphological model is set-up using harmonic tide in order to avoid excessive computational time. After gaining results of model in agreement with the datasets of two different time scales, simulation is performed using optimal settings and creating new navigation channel of 3 m below chart datum. For better comprehension channel is divided into three zones according to width. Result shows that annual maintenance dredging quantity in the proposed channel is 0.414 million m(3), demonstrates numerical model successfully and estimates the maintenance dredging quantity of navigation channel in Thane Creek.

关键词： Navigation Siltation Dredging Hydrodynamic Morphological

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Observer Design for Estimating Road Elevations at All Tire Contact Patches Using Only an Inertial Sensor 16th

Observer Design for Estimating Road Elevations at All Tire C...

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16th International Symposium on Advanced Vehicle Control

作者： Choi, Hosik Gime, Juhui Changwon Natl Univ Chang Won 51140 South Korea

ISBN: (纸本)9783031703942;9783031703928;9783031703911

This paper designs an observer for estimating road elevations at all tire contact patches using only an inertial sensor with high accuracy, comparable to that of laser scanning. The observer is constructed within the framework of the unknown input Kalman filter to estimate road elevations, which act as disturbances to vehicle dynamics. The model for the observer is based on vertical-pitch-roll dynamics, encompassing road elevations at all tire contact patches. The introduction of virtual measurements for all tires ensures the observability of the model in the inertial sensor-based observer without requiring both additional sensors and model simplification. Additionally, a bias model is added to compensate for sensor installation errors for practical realization. Experimental validation demonstrates that the proposed observer can estimate road elevation with high accuracy, regardless of vehicle speed and dynamics, even when utilizing only an inertial sensor, making it suitable for rapid and robust road maintenance.

关键词： Road elevation estimation Inertial sensor signals Virtual measurement Observable model design Unknown Input Kalman Filter

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Iterative Learning Trajectory Tracking Control of an Autonomous Bicycle 16th

Iterative Learning Trajectory Tracking Control of an Autonom...

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16th International Symposium on Advanced Vehicle Control

作者： Wang, Yixiao Bruzelius, Frederik Sjoberg, Jonas Chalmers Univ Technol Dept Elect Engn Gothenburg Sweden Chalmers Univ Technol Dept Mech Engn Gothenburg Sweden

ISBN: (纸本)9783031703942;9783031703928;9783031703911

An autonomous bicycle has been developed for repeatable active safety tests of Advanced Driver Assistance Systems (ADAS). For effective interaction with other test objects, precise bicycle trajectory tracking control is essential. The repetitive nature of these tests suggest an Iterative Learning Control (ILC) approach. In this paper, we present a design of an ILC controller tailored for the trajectory tracking problem of an autonomous bicycle. To illustrate the performance of the controller, simulations have been conducted.

关键词： Motion control Iterative learning control Trajectory tracking

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