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9th IFAC Symposium on Fault Detection, Supervision and Safety for Technical Processes, SAFEPROCESS 2015

作者： Letot, C. Dersin, P. Pugnaioni, M. Dehombreux, P. Fleurquin, G. Douziech, C. La-Cascia, P. University of Mons Faculty of Engineering Department of Machine Design and Production Engineering 20 Place du Parc Mons7000 Belgium ALSTOM Transport Sa 48 Rue Albert Dhalenne 93482 France ALSTOM Ferroviaria Spa 75 Via Di Corticella Bologna Italy

The goal of this paper is to share experience about the degradation assessment of railway track point machines. A real scale point machine test bench was used to perform several thousands of maneuvers. Recorded data consisted in the measurements of the shaft speed and the torque during a maneuver. Some faulty conditions were introduced to obtain degraded signals. Relevant indicators were computed to quantify the health state of the point machine and to detect faulty behaviours. The analysis also highlighted the influence of the temperature on the point machine performance. A degradation model is then built from the indicator to compute the reliability and the remaining useful life. The conclusions of this analysis will be useful to properly define an experimental design to be applied on a real turnout. © 2015, IFAC (International Federation of Automatic Control) Hosting by Elsevier Ltd. All rights reserved.

关键词： Fault detection

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Finite Element Prediction of the Tool Wear Influence in Ti6Al4V Machining

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Procedia CIRP 2015年 31卷 124-129页

作者： François Ducobu Pedro-José Arrazola Edouard Rivière-Lorphèvre Enrico Filippi University of Mons (UMONS) Faculty of Engineering (FPMs) Machine Design and Production Engineering Department 20 Place du Parc B-7000 Mons Belgium Mondragon University Faculty of Engineering Mechanical and Manufacturing Department Mondragón 20500 Spain

Ti6Al4 V is a titanium alloy widely used in the aeronautical industry and machining is often adopted to manufacture it. These parts must satisfy requirements specified by the customer. A crucial characteristic of aircraft machined parts is their reliability and, therefore, their fatigue life has to be mastered. In this context, the corresponding requirement concerns the surface integrity. This should be achieved by selecting adequate cutting parameters, which is actually not an immediate operation. The geometry of the tool will afterwards change during its life, what is more as Ti6Al4 V is known to be a hard-to-machine material. In this context, a finite element model is developed to highlight the influence of tool wear on fundamental variables like forces, temperatures, stresses,... and surface integrity (through plastic strains). The results should help to decide when it is time to replace the tool before altering the part and therefore not meet the specifications anymore.

关键词： Surface integrity Titanium Finite element method (FEM)

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Dynamic damage of rubber-textile belts in pipe conveyor application

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Bulk Solids Handling 2015年第4期35卷 44-49页

作者： Fedorko, Gabriel Molnär, Vieroslav Kopas, Melichar Tomaškovä, Marianna Logistics Institute of Industry and Transport Faculty BERG Technical University of Kosice Slovakia Department of Engineering for Machine Design Automotive and Transport Faculty of Mechanical Engineering Technical University of Košice Slovakia Department of Machine Safety and Production Quality Faculty of Mechanical Engineering Technical University of Kosice Slovakia

Rubber-textile conveyor belts and steel-cord conveyor belts are exposed to impacts of various negative factors occurring during the standard operation of belt conveyors, whereas these factors are causing gradual wear of the conveyor belts. The wear-out process of the conveyor belt is a limiting condition, which has a decisive impact on operational life of the conveyor belt with regard to keeping the required operational characteristics within the framework of the given transport equipment operability.

关键词： Belt conveyors

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Effect of HIPping (Hot Isostatic Pressing) on electron beam melting Ti6Al4V parts after machining

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AIP Conference Proceedings 2016年第1期1769卷

作者： Adrien Dolimont Sebastien Michotte Edouard Rivière-Lorphèvre François Ducobu Charlotte de Formanoir Stéphane Godet Enrico Filippi 1Corresponding author : Machine Design and Production Engineering Lab - Faculty of Engineering - University of Mons Place du parc 20 7000 Mons Belgium 2SIRRIS - collective centre for and by the technological industry 26 Rue Auguste Piccard 6041 Gosselies Belgium 34MAT Université Libre de bruxelles 50 av. F.D. Roosevelt (CP 165/63) 1050 Bruxelles Belgium

The fast growing of Additive Manufacturing (AM) leads us to study the functionality of parts built by these processes. Recently, the Electron Beam Melting process and the Direct Melting Laser Sintering process are used to produce parts in the biomedical and aeronautical fields. The Ti6Al4V is largely used in these fields. This paper present an experimental study of machining Ti6Al4V alloy produced by Electron Beam Melting (EBM) before and after HIPping (Hot Isostatic Pressing). The results shows that the hipping has no significant influence on specific cutting pressure.

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Robot control as a service - Towards cloud-based motion planning and control for industrial robots 10

Robot control as a service - Towards cloud-based motion plan...

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10th International Workshop on Robot Motion and Control, RoMoCo 2015

作者： Vick, Axel Vonásek, Vojtěch Pěnička, Robert Krüger, Jörg Department of Industrial Automation Technology Institute for Machine Tools and Factory Management Technische Universität Berlin Pascalstr. 8-9 Berlin10587 Germany Czech Technical University in Prague Faculty of Electrical Engineering Technicka 2 Prague16627 Czech Republic Department of Robotics and Automation Fraunhofer Institute for Production Systems and Design Technology IPK Pascalstr. 8-9 Berlin10587 Germany

ISBN: (纸本)9781479970438

This paper introduces a new concept for flexible motion planning and control of industrial robots. Instead of a closed monolithic architecture, an open service-based framework is proposed. The services can be run hardware-independent on a decentralized IT infrastructure (Cloud) allowing a fast reconfiguration of control modules and their multiple usage in different tasks. The services can be run on a dedicated PC or on individual virtual machines inside a single computing cluster. The proposed service-based framework was implemented and tested for the motion planning of a robotic manipulator. Effects on control performance, availability and scalability are investigated and documented. © 2015 IEEE.

关键词： Motion planning

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A cost-based model to select best capacity scaling policy for reconfigurable manufacturing systems

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International Journal of Manufacturing Research 2015年第2期10卷 162-183页

作者： Elmasry, Shady S. Youssef, Ayman M.A. Shalaby, Mohamed A. Department of Mechanical Design and Production Faculty of Engineering Cairo University 2nd Floor Building 10 Giza12613 Egypt Department of Industrial Engineering University of Miami 1251 Memorial Drive Coral GablesFL33146 United States Research Lab Department of Industrial and Manufacturing Systems Engineering University of Windsor 401 Sunset Avenue WindsorONN9B 3P4 Canada

This study presents a system dynamics approach to model and analyse a single stage reconfigurable manufacturing system (RMS). The system is exposed to a random demand that follow a normal distribution. New modifications to the existing state of the art capacity scaling model are applied to bring it closer to reality. A module to account capacity scaling costs and a module for considering seasonal demand are introduced. The objective of this study is to evaluate the performance of different capacity scaling policies for various system scenarios. Experimentations are applied on three stages;preliminary experimentation, Taguchi fractional factorial design, and 24 full factorial design to conduct various system scenarios. Two policy selection rules are produced to help a practitioner in deciding the best scaling policy according to the existing system scenario. The results showed that chasing demand policy and inventory-based policy have the best performance for most system scenarios. Copyright © 2015 Inderscience Enterprises Ltd.

关键词： Costs

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CPG tuning using sensory feedback for walking applications

CPG tuning using sensory feedback for walking applications

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ECCOMAS Thematic Conference on Multibody Dynamics 2013

作者： Chariot, Christophe Filippi, Enrico Verlinden, Olivier Department of Machine Design and Production Engineering University of Mons Faculty of Engineering 20 Place du Parc 7000 Mons Belgium Department of Theoretical Mechanics and Dynamics and Vibrations University of Mons Faculty of Engineering 20 Place du Parc 7000 Mons Belgium

ISBN: (纸本)9789537738228

A modular robot can adapt the configuration of its structure according to the current need. However, this assembly of modules features many degrees of freedom that must be correctly coordinated in order to generate a coherent motion. If we focus on the locomotion problem, it deals with this issue by using a bio-inspired technique based on non-linear oscillators : Central Pattern Generators (CPG). Classically, the tuning of the oscillators is handled by evolutionary algorithms that involve the evaluation of many solutions. In this paper, we present an alternative method that guides the oscillator tuning continuously so that the process substantially reduces its computational cost. More particularly, we propose a method, in the context of legged structure, that tunes the hip joint parameters of the leg of a Roombots quadruped. The system is based on the Hopf oscillator presented in [1] that includes a sensory feedback correction and to which we add a tuning layer. Indeed, depending on the action of the feedback, we adapt the oscillators parameters until the system is stabilized. Results show that the system converges to a stable solution from any initial parameters. If we compare the result with a particle swarm optimisation method, we can see that the final performance index reaches a smaller value but it also requires much less simulation time and benefits from continuous and smooth transitions.

关键词： Modular robots

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Chip Formation in Micro-cutting

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Journal of Mechanics engineering and Automation 2013年第7期3卷 441-448页

作者： Franqois Ducobu Edouard Rivi~re-Lorph~vre Enrico Filippi Machine Design and Production Engineering Department FPMs (Faculty of Engineering) UMONS (University of Mons) MonsB-7000 Belgium

The miniaturisation context leads to the rise of micro-machining processes. Micro-milling is one of the most flexible and fast of them. Although it is based on the same principles as macro-cutting, it is not a simple scaling-down of it. This down-sizing involves new phenomena in the chip formation, such as the minimum chip thickness below which no chip is formed. This paper presents a review of the current state of the art in this field from an experimental and a numerical point of view. A 2D finite element model is then developed to study the influence of the depth of cut on the chip formation. After the model validation in macro-cutting, it highlights the phenomena reported in literature and allows to perform a minimum chip thickness estimation.

关键词： Chip formation micro-cutting minimum chip thickness orthogonal cutting saw-toothed chip Ti6AI4V.

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Influence of the Material Behavior Law and Damage Value on the Results of an Orthogonal Cutting Finite Element Model of Ti6Al4 V

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Procedia CIRP 2013年 8卷 379-384页

作者： F. Ducobu E. Rivière-Lorphèvre E. Filippi University of Mons (UMONS) Faculty of Engineering (FPMs) Machine Design and Production Engineering Department 20 Place du Parc B-7000 Mons (Belgium)

A finite element model has been developed with Abaqus/Explicit to model the orthogonal cutting of Ti6Al4 V. Experiments were carried out to validate its results. The experimental cutting conditions are the same as those used in the finite element model. They lead to the production of a saw-toothed chip, either numerically or experimentally. The comparison of the model results shows that the difference with the experimental RMS cutting force value is quite large (about 40%). Both chips morphologies are similar although the teeth of the simulated one have smaller valleys and lengths. The numerical model could therefore be improved. The aim of this paper is to study the influence of the material behavior law and the damage value on the model results, in order to get closer to the experimental results. It shows that the difference between numerical and experimental cutting forces reduces drastically (it becomes of the order of 2%) for stresses obtained with the modified behavior law similar to those observed in the literature. The teeth of the chip have a larger valley and are therefore closer to the experimental chip. These improvements do not interfere with the physics of the saw-toothed chip formation, which is still the same as the experimental one. An important point is that it turns out that the influence of the material behavior law and of the damage value are almost decoupled within the limits of the variations selected. Indeed, the material behavior law controls the level of the cutting force while the damage value acts mostly on the morphology.

关键词： Chip formation damage finite element material behavior law saw-toothed chip Ti6Al4 V

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A Testpart for Interdisciplinary Analyses in Micro production engineering

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Procedia CIRP 2015年 28卷 106-112页

作者： H.-C. Möhring P. Kersting S. Carmignato J.A. Yagüe-Fabra M. Maestro R. Jiménez E. Ferraris L.T. Tunc F. Bleicher W.W. Wits K. Walczak M. Hedlind IFQ OvGU Magdeburg Universitaetsplatz 2 39106 Magdeburg Germany ISF TU Dortmund Baroper Str. 301 44227 Dortmund Germany DTG University of Padova Stradella San Nicola 3 36100 Vicenza Italy I3A Universidad de Zaragoza Zaragoza María de Luna 3 50018 Zaragoza Spain I3A Centro Universitario de la Defensa Carretera de Huesca s/n 50090 Zaragoza Spain Department of Mechanical Engineering KU Leuven J. De Nayerlaan 5 2860 Sint-Katelijne-Waver Belgium Manufacturing Research Laboratory Faculty of Engineering And Natural Sciences Sabanci University OrhanliTuzla 34956 Istanbul Turkey IFT TU Vienna Karlsplatz 13 1040 Vienna Austria Lab. of Design Production and Management Fac. of Eng. Techn. University of Twente P.O. Box 217 7500 AE Enschede The Netherlands Joint Center for Artificial Photosynthesis Lawrence Berkeley National Laboratory One Cyclotron Road Mail Stop: 976 Berkeley CA. 94720 USA Global Industrial Development Scania CV AB 151 87 Södertälje Sweden

In 2011, a round robin test was initiated within the group of CIRP Research Affiliates. The aim was to establish a platform for linking interdisciplinary research in order to share the expertise and experiences of participants all over the world. This paper introduces a testpart which has been designed to allow an analysis of different manufacturing technologies, simulation methods, machinery and metrology as well as process and production planning aspects. Current investigations are presented focusing on the machining and additive processes to produce the geometry, simulation approaches, machine analysis, and a comparison of measuring technologies. Challenges and limitations regarding the manufacturing and evaluation of the testpart features by the applied methods are discussed. Video abstract Download : Download video (1MB)

关键词： Micro production engineering Testpart Round Robin Micro Milling Additive Manufacturing Metrology Computed Tomography

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