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Wire EDM Monitoring for Zero-defect Manufacturing based on Advanced Sensor Signal Processing

Procedia CIRP 2015年 33卷 315-320页

作者： Alessandra Caggiano Roberto Teti Roberto Perez Paul Xirouchakis Fraunhofer Joint Laboratory of Excellence on Advanced Production Technology (Fh-J_LEAPT) Department of Chemical Materials and Industrial Production Engineering University of Naples Federico II P.le Tecchio 80 80125 Naples Italy GF Machining Solutions Rue du Pré-de-la-Fontaine 8 1217 Meyrin 1 / Geneva Switzerland Laboratory for Computer-Aided Design and Production Swiss Federal Institute of Technology (EPFL) CH-1015 Lausanne Switzerland

In the framework of zero-defect manufacturing, an advanced sensor monitoring procedure aimed at detecting the process conditions leading to surface defects in Wire Electrical Discharge Machining (WEDM) is proposed. WEDM experimental tests were carried out with the employment of a multiple sensor monitoring system to acquire voltage and current signals in the gap between workpiece and wire electrode at the high sampling rate of 100 MHz. In order to extract from the acquired signals the most relevant features that can be useful in the identification of abnormal process conditions, an advanced sensor signal processing methodology based on signal feature extraction for the construction of sensor fusion pattern vectors is proposed and implemented.

关键词： Wire EDM Sensor monitoring Signal processing Zero-defect manufacturing Feature extraction Sensor fusion pattern vector.

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Evaluation of the thermal damage in glass fiber polymer-matrix composites in wind turbine blades subjected to lightning strike 29

Evaluation of the thermal damage in glass fiber polymer-matr...

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29th Annual Technical Conference of the American Society for Composites, ASC 2014;16th US-Japan Conference on Composite Materials;ASTM-D30 Meeting

作者： Wang, Y. Zhupanska, O.I. Department of Mechanical and Industrial Engineering University of Iowa 229 Center for Computer-Aided Design Iowa CityIA52242 United States Department of Mechanical and Industrial Engineering University of Iowa 2416A Seamans Center Iowa CityIA52242 United States

ISBN: (纸本)9781605951249

A primary motivation for this study comes from the need to improve the ability of polymer matrix composites to withstand lightning strikes. In particular, we are concerned with lightning strike damage in composite wind turbine blades. The problem is essentially multiphysic, as the electric-current-induced temperature in the composite blade subjected to a lightning strike may reach up to 1,200 °C, leading to extensive thermal damage including surface damage, delamination, cracks, matrix decomposition, fiber breakage and sublimation, and abrupt failure of the blade. In this work, the thermal response of the polymer-matrix composite laminate used in a Sandia 100-meter All-glass Baseline Wind Turbine Blade (SNL 100-00) subjected to lightning strike is studied. The tip region composite panel is considered, as it has been reported in the literature that the blade tip is more susceptible to lightning strike than the remaining parts of the blade. A physical model to show the surface interaction between the lightning arc and the composite structure has been developed. The model provides time- and electric-current-dependent variation of the lightning arc radius and lightning-current-induced heat flux generated at the composite surface. The temperature-dependent thermal properties of the VectorPly E-LT 5500 unidirectional [0]2 E-glass fiber vinyl ester resin matrix fabric and SNL triaxial [±45]2[0]2 E-glass fiber vinyl ester resin matrix fabric used in the wind blade tip composite panel were derived using available experimental data. The formulated nonlinear transient heat transfer problem with moving boundary is solved using the finite element method. The solution procedure accounts for phase transitions in the materials, and the obtained results include temperature field profiles and evolution of the thermal damage.

关键词： Polymer matrix composites

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Thermal analysis methods for design of composite materials with complex structure

Thermal analysis methods for design of composite materials w...

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2014 Electrochemical Conference on Energy and the Environment, ECEE 2014

作者： Jaworski, N. Farmaga, I. Matviykiv, O. Lobur, M. ͆piewak, P. Ciupiński, L. Kurzydlowski, K.J. Department of Computer-Aided Design Lviv Polytechnic National University 5 Metropolian Andrey St. Lviv79013 Ukraine Faculty of Materials Science and Engineering Warsaw University of Technology 141 Woloska St. Warsaw02-507 Poland

The aim of this work is the development of universal discrete models of composite materials, which can take into account their complex structure, and allow one to solve heat transfer problem as well as calculate effec... 详细信息

ISBN: (纸本)9781607685555

关键词： Composite materials

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A Methodology for Longitudinal Tooth Flank Crowning of the Helical Gear on a CNC Honing Machine

A Methodology for Longitudinal Tooth Flank Crowning of the H...

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2014 2nd International Conference on Future Materials engineering and Industry Application(ICFMEIA 2014)

作者： Van-The Tran Ruei-Hung Hsu Chung-Biau Tsay Program of Mechanical and Aeronautical Engineering Feng Chia University Program in Precision System Design Feng Chia University Department of Mechanical and Computer-Aided Engineering Feng Chia University

The gear honing is the most economical way for hard finishing an involute helical gear after hobbing and heat treatment or after shaving and heat treatmentThe gear honing can also be applied to the modification of gear tooth surfaces to compensate for the distortions that occur during heat treatment processMost published papers on the technology of gear honing describes on the principle of generated gear surfaceHowever, the longitudinal tooth flank crowning of a helical gear with honing has not been investigated yetTherefore, in this paper, we proposed a novel method for longitudinal tooth flank crowning of work gear surfaces by setting a crossed angle between the honing cutter and work gear axes as a linear function of honing cutter's traverse feed in the honing processA mathematical model for the tooth profile of work gear honed by a standard honing cutter is also establishedThree numeral examples are presented to illustrate and verify the merits of the proposed gear honing method in longitudinal crowning.

关键词： Gear honing Longitudinal crowning Tooth flank Helical gear Mathematical model

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11th German Conference on Chemoinformatics (GCC 2015) Abstracts

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JOURNAL OF CHEMINFORMATICS 2016年第SUPPL 1期8卷 1-27页

作者： [Anonymous] GDCh-CIC Division Associated Board Member Beilstein-Institut zur Förderung der Chemischen Wissenschaften Trakehner Str. 7-9 60487 Frankfurt Germany. ufechner@beilstein-institut.de. Division Medicinal Chemistry Amsterdam Institute for Molecules Medicines and Systems (AIMMS) VU University Amsterdam The Netherlands. Centre for Bioinformatics Uni Hamburg Bundesstr. 43 20146 Hamburg Germany. Sanofi-Aventis Deutschland GmbH 65926 Frankfurt am Main Germany. stefan.guessregen@***. Sanofi-Aventis Deutschland GmbH 65926 Frankfurt am Main Germany. GlaxoSmithKline Stevenage SG1 2NY UK. nicola.j.richmond@***. Discngine Paris 75011 France. Organisch-Chemisches Institut Westfälische Wilhelms-Universität Münster Germany. marwin.segler@wwu.de. Organisch-Chemisches Institut Westfälische Wilhelms-Universität Münster Germany. Bundeskriminalamt Wiesbaden Central Analytics II 65173 Wiesbaden Germany. Department of Chemistry and Biochemistry University of California Santa Barbara CA 93111 USA. shea@chem.ucsb.edu. Department of Chemistry and Biochemistry University of California Santa Barbara CA 93111 USA. Chemistry Department Ludwig-Maximilians-Universität München Butenandtstr. 7 81377 Munich Germany. Inorganic Chemistry and Center for Nanointegration University of Duisburg-Essen Essen Germany. CAM-D Technologies Essen Germany. Institute for Bioinformatics and Chemoinformatics Westphalian University of Applied Sciences Recklinghausen Germany. Institute for Bioinformatics and Chemoinformatics Westphalian University of Applied Sciences Recklinghausen Germany. achim.zielesny@w-hs.de. Leiden University Leiden Netherlands. j.fraaije@chem.leidenuniv.nl. Culgi BV Berlin Germany. Physikalische Chemie III TU Dortmund 44227 Dortmund Germany. stefan.kast@tu-dortmund.de. Centre for Molecular Informatics Department of Chemistry University of Cambridge Lensfield Road Cambridge CB2 1EW United Kingdom. kcb27@cam.ac.uk. Centre for Molecular Informatics Department of Chemistry

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Characteristics of TiO2 metal-semiconductor-metal photodetectors with O2 plasma treatment

Characteristics of TiO2 metal-semiconductor-metal photodetec...

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International Conference on Information Science, Electronics and Electrical engineering (ISEEE)

作者： L. W. Ji I. T. Tang S. J. Young T. H. Meen J. K. Tsai T. C. Wu S. J. Chang Y. P. Luo K. C. Lee J. C. Lin B. Y. Lee Institute of Electro-Optical and Materials Science National Formosa University Taiwan Department of Greenergy National University of Tainan Tainan Taiwan Department of Electronic Engineering National Formosa University Taiwan Department of Electrical Engineering National Cheng Kung University Tainan Taiwan Department of Automation Engineering National Formosa University Taiwan Department of Mechanical Design Engineering National Formosa University Taiwan Department of Mechanical and Computer-Aided Engineering National Formosa University Taiwan

In this study, titanium dioxide (TiO 2 ) films were prepared on Corning glass substrates by radio frequency (RF) magnetron sputtering and treated without and with O 2 plasma conditions, and then were used to fabricate metal-semiconductor-metal (MSM) ultraviolet (UV) photodetectors (PDs). The effects of the changes on TiO 2 films were investigated by using field-emission scanning electron microscope (FE-SEM), photoluminescence (PL) system and four-point probe measurement. With a 360-nm illumination and 5 V applied bias, it was found that the responsivities of the fabricated TiO 2 PDs without and with 2 minutes O 2 plasma treatment were 36 and 153 A/W, respectively.

关键词： Plasmas Surface treatment Films Educational institutions Charge carrier processes Surface morphology Plasma measurements

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Filling trim cracks on GPU-rendered solid models

Filling trim cracks on GPU-rendered solid models

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作者： Pavanaskar, Sushrut McMains, Sara Computer Aided Design and Manufacturing Laboratory Department of Mechanical Engineering University of California Berkeley CA 94720 United States

We present an algorithm for improving the rendering appearance of CAD models with trimmed freeform surfaces when evaluated on graphics processing units (GPUs). Rendering on client GPUs allows mechanical CAD to embrace cloud computing by storing a single auto-synchronized model file in the cloud and transferring only minimal data (control points, trim curves, etc.) to the client nodes for local evaluation/rendering. However, current parallel algorithms that directly evaluate and render trimmed surfaces by masking the trims, without tessellating along the trim curves, suffer from "cracks" along the trim boundaries. We have developed a hybrid CPU-GPU algorithm to remove these artifacts in the rendering stage for a smooth, color- and shading-matched appearance. After dynamically detecting the cracks, our algorithm selectively fills in the affected pixels using a GPU fragment program, while avoiding artifacts at silhouettes. We have implemented this algorithm to demonstrate improvements in the appearance of solid models directly evaluated and rendered on the GPU. © 2012 Elsevier Ltd. All rights reserved.

关键词： Graphics processing unit

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Thermal Analysis Methods for design of Composite Materials with Complex Structure

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ECS Meeting Abstracts 2014年第6期MA2014-03卷

作者： Nazariy Jaworski Ihor Farmaga Oleh Matviykiv Mykhaylo Lobur Piotr Spiewak Lukasz Ciupinski Krzysztof J. Kurzydlowski Department of Computer-Aided Design of Lviv Polytechnic National University Faculty of Materials Science and Engineering Warsaw University of Technology

Abstract not Available.

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Thermal Analysis Methods for design of Composite Materials with Complex Structure

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ECS Transactions 2014年第1期59卷

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Human sensory assessment linked with geo-and mobile-data processing methods in urban planning exemplified on different cultures in Germany and Egypt

Human sensory assessment linked with geo-and mobile-data pro...

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13th International Conference on computers in Urban Planning and Urban Management, CUMPUM 2013

作者： Bergner, Benjamin Sebastian Exner, Jan-Philipp Memmel, Martin Raslan, Rania Talal, Manar Taha, Dina Zeile, Peter Department for Computer Aided Design in Urban Planning and Architec-ture Cpe University of Kaiserslautern Germany FB Knowledge Management Germany Department of Architecture Faculty of Engineering Alexandria Univer-sity Alexandria Egypt

ISBN: (纸本)9789081696029

Human sensory assessment is a new approach to objectively gather subjec-tive data concerning humans' perception of space and emotional reactions towards space in real-time. The resulting data enables urban planners to get a more comprehensive view of interdependencies between people and their urban environment. This paper shows the methodical framework be-ginning from gathering over processing and analyzing to visualizing emo-tional reactions of selected participants. The research aims to optimize and automatize the processing between human sensory assessment, geo-and mobile-data. The challenge lies in joining and processing the generated various data types to gain visual tangible results. In order to apply the complete methodical repertoire, different case studies and exemplary anal-yses were conducted in Germany and Egypt, dealing with the exemplary research question "How do people of different cultures perceive their envi-ronment in different countries?".

关键词： Urban planning

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