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6th International Conference on Knowledge Management and Information Sharing, KMIS 2014

作者： Urwin, Esmond Neil Palmer, Claire Cutting-Decelle, Anne-Françoise Sánchez Cid, Francisco Pinazo-Sánchez, José Miguel Pajkovska-Goceva, Sonja Young, Robert Ian Marr Loughborough University Wolfson School of Mechanical and Manufacturing Engineering Loughborough Leicestershire United Kingdom Ecole Centrale de Lille Cite Scientifique CS 20048 Villeneuve D'Ascq Cedex59651 France Instituto Tecnológico de Informática Camino de Vera s/n Edif. 8G Acceso B ValenciaCP 46022 Spain Ainia Centro Tecnológico Parque Tecnológico de Valencia Avinguda de Benjamin Franklin 5-11 Paterna Valencia46980 Spain Fraunhofer Institute for Production Systems and Design Technology IPK Pascalstraße 8-9 Berlin10587 Germany University of Geneva CUI ICLE CarougeCH 1227 Switzerland

ISBN: (纸本)9789897580505

The development and utilisation of flexible, reconfigurable Global Production Network organisations presents issues for the sharing and reuse of information and knowledge between systems and domains. The research approach put forward in this paper posits that manufacturing reference ontologies can provide the necessary underlying flexibility in a semantic-base to support interoperability. Moreover for that to be of real value to industry it needs to be commonly applicable across the breadth of manufacturing business and therefore be offered as a standard.

关键词： Interoperability

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Using a text mining tool for patent analyses: Development of a new method for the repairing of gas turbines

Using a text mining tool for patent analyses: Development of...

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Portland International Conference on Management of Engineering and technology (PICMET)

作者： Yvonne Wich Joachim Warschat Dieter Spath Antonino Ardilio Kamilla König-Urban Eckart Uhlmann Fraunhofer Institute for Industrial Engineering IAO Stuttgart Germany Fraunhofer Institute for Production Systems Design Technology IPK Berlin Germany

The content analysis of hundreds of patents during early phases of R&D processes is still complex and time consuming. Many companies avoid the analysis of patents and are not aware of the huge knowledge that might be useful for their own R&D. Therefore fraunhofer IAO developed a method for a software-based patent analysis, the so called White Spot Analysis. Core element of this analysis is the usage of a text-mining solution for the analysis of patents, especially for the analysis of problems and solutions provided by patents. This paper demonstrates the result of a White Spot Analysis: The practical example deals with the development of a new method for the repairing of gas turbines, especially the repairing of high pressure turbine blades. It is shown how the developed text-mining solution assisted the patent analysis and the idea generation process.

关键词： Patents Turbines Blades Maintenance engineering technology management Conferences Text mining

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Passive Haptic Feedback for Manual Assembly Simulation

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Procedia CIRP 2013年 7卷 509-514页

作者： Néstor Andrés Arteaga Martin Victor Mittelstädt Michael Prieur Rainer Stark Thomas Bär Production oriented product validation - Daimler AG P.O. Box 2360 89013 Ulm Germany Fraunhofer Institute for Production Systems and Design Technology IPK Pascalstraße 8-9 10857 Berlin Germany

In this study movable props representing an object were used to try to achieve realistic movements of a worker during completion of a manipulation task in an assembly-like scenario recreated in a mixed reality environment. The form and the weight of the movable props were adjusted to different resemblance levels. The effect of these levels on the experiential fidelity of the worker and on the action fidelity of process observers was studied. Results showed that increasing the fidelity of the movable props does not necessarily result on better performance, e.g. simulating the weight of the actual object only seems to improve the experience if the prop also resembles the form of the actual object. Further study is suggested to better understand the effect of other factors.

关键词： Manual Assembly Simulation Assembly Planning Assembly Verification Motion Capture Mixed Reality.

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Development and Optimization of the Die-Sinking EDM-technology for Machining the Nickel-based Alloy MAR-M247 for Turbine Components

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Procedia CIRP 2013年 6卷 180-185页

作者： E. Uhlmann D.C. Domingos Institute for Machine Tools and Factory Management IWF Technische Universität Berlin Pascalstraße 8-9 10587 Berlin Germany Fraunhofer Institute for Production Systems and Design Technology IPK Pascalstraße 8-9 10587 Berlin Germany

In this paper, the results regarding the optimization of the die-sinking EDM-technology for the fabrication of turbine components are presented. The main objective of this work was the reduction of machining time while producing cavities with a depth of 11 mm in the alloy MAR-M247, with respect to the requirements for surface roughness and sub-surface damage. The study was conducted using graphite electrodes of three different dimensions, totalizing 12 electrodes and a total electrode area of 89.50 mm 2 . The machine tool GENIUS 1000 THE CUBE was used in the experiments and IonoPlus IME-MH was used as dielectric fluid. The design of Experiments Methods (DoE) were applied in the planning and execution of all experiments. Firstly, experiments were conducted to estimate the maximal discharge current that can be applied for fulfilling the quality criteria regarding both surface roughness and thickness of affected sub-surface, since discharge current is known as the main influencing process parameter affecting both factors. In the second stage, the process was optimized by varying following electrical parameters of the machine tool: discharge current (ie), discharge duration (ti), pause duration (t0), ignition voltage (V) and duty factor (τ). Finally, both process parameters as well as machine tool's control parameters were adjusted to achieve optimized results regarding the total machining time and electrode wear with respect to the surface requirements of produced parts. A total machining time reduction of more than 50% in comparison to the technology currently employed by the industry was achieved. Requirements on both arithmetical surface roughness as well as affected sub-surface thickness could be fulfilled. This robust technology was developed for producing the cavities in MAR-M247 and all applied methods, studied parameters as well as the results regarding machining time, electrode wear and the quality of the achieved work piece are presented.

关键词： die-sinking EDM high aspect ratio cavities high temperature resistant materials turbine components

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Investigations on Vibration-Assisted EDM-Machining of Seal Slots in High-Temperature Resistant Materials for Turbine Components

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Procedia CIRP 2013年 6卷 71-76页

Modern aircraft engines are nowadays designed with the aim of reducing fuel consumption and emission of pollutant gases as well as increasing reliability and competitiveness in the manufacturing and repair costs. These requirements on the engines result in new requirements on components and manufacturing processes, to know: application of new engineering materials, higher component temperatures, increased demands on tightness, 3-D complex shapes as well as new manufacturing technologies. EDM-machining is typically chosen for applications including complex geometries like high aspect ratio cavities in high-temperature resistant materials, since the EDM-process is independent from the mechanical properties of the processed material. This paper addresses the design and utilization of a unit composed of piezoelectric actuators for machining seal slots in turbine components. This aims the optimization of the flushing mechanisms through vertical vibration of the tool electrodes while manufacturing high aspect ratios cavities and therewith the optimization and/or reduction of both process time and electrode wear. Firstly, the piezo-unit was designed and components like piezoelectric actuators and charge amplifier were chosen, in accordance to previous defined requirements regarding vibration frequencies and amplitudes. During the experimental investigations graphite electrodes were applied. A total of twelve cavities with an aspect ratio of 12 are simultaneously machined in the material MAR-247. During the process, a harmonic longitudinal vibration of the electrodes overlapped to the machine's feed movement is realized. Both vibration amplitude and frequency were varied during the experiments, ranging from 2 μm to 16 μm and from 50 Hz to 1 kHz, respectively. The results are compared to the conventional process without vibration, while the EDM-parameters remain unaltered. By applying longitudinal vibration to the tool electrodes the material removal rate was increas

关键词： die-sinking EDM vibration-assisted EDM high aspect ratio cavities high-temperature resistant materials turbine components

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Visualization of virtual reality neurological motor rehabilitation of the upper limb — A systematic review

Visualization of virtual reality neurological motor rehabili...

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International Workshop on Virtual Rehabilitation

作者： Luara Ferreira dos Santos Henning Schmidt Jörg Krüger Christian Dohle Rehabilitation Robotics Group (IPK/TU Berlin) DFG Research Training Group prometei Technische Universität Berlin Berlin Germany Dept of Automation Technology Fraunhofer Institute for Production Systems and Design Technology (IPK) Berlin Germany Dept of Neurological Rehabilitation University of Potsdam Germany

Most virtual rehabilitation environments rely on visual feedback. However, little is known on the optimum characteristics of these feedbacks. Here, we present first results of a systematic literature review to assess and compare visual feedback types in virtual reality (VR) based neurological motor rehabilitation of the upper limb. Overall we identified 104 relevant publications. Within these some applied multiple visual feedback types. We found six main visualization groups: Avatar Feedback (N=52), Augmented Reality Feedback (N=16), Abstract Feedback (N=40), Tracking Feedback (N=13), Performance Evaluation Feedback (N=2), and Combined Feedback (N=7). However, there is insufficient evidence for the choice of a specific visual feedback in relation to motor outcome. Thus, further research is necessary.

关键词： Visualization Avatars Systematics Abstracts Augmented reality Performance evaluation

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Advanced methods for small batch robotic machining of hard materials 7

Advanced methods for small batch robotic machining of hard m...

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7th German Conference on Robotics, ROBOTIK 2012

作者： Surdilovic, Dragoljub Zhao, Hongqing Schreck, Gerhard Kruger, Jorg Fraunhofer Institute for Production Systems and Design Technology IPK Berlin Germany

The research presented in this paper focuses on automatic machining of hard materials using standard industrial robots. The automation of robotic milling utilizes CAD/CAM, robotic planning tools and advanced robot control algorithms. In order to achieve high milling accuracy, the generated milling paths by CAM program have been optimized by means of a novel robotic milling toolbox. These tools take into consideration robot specific performance and constraints to optimize robotic milling before generating automatically executable program for the robot controllers. To cope with nonlinear effects of robot joint friction, path governor function has been developed, to regulate in real time the velocity in the case of increasing errors. The problems of grinding and polishing have been addressed using robust impedance and force control. The presented experimental results of robotic stone and metal machining illustrate high achievable performance and complete parts machining using conventional industrial robots. © 7th German Conference on Robotics, ROBOTIK 2012

关键词： Milling (machining)

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The Secure Information Society: Ethical, Legal and Political Challenges

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2012年

作者： Jrg Krger Bertram Nickolay Sandro Gaycken

ISBN: (纸本)9781447147626

In our modern information societies, we not only use and welcome computers; we are highly dependent upon them. There is a downside of this kind of progress, however. Computers are not 100% reliable. They are insecure. They are vulnerable to attackers. They can either be attacked directly, to disrupt their services, or they can be abused in clever ways to do the bidding of an attacker as a dysfunctional user. Decision-makers and experts alike always struggle with the amount of interdisciplinary knowledge needed to understand the nuts and bolts of modern information societies and their relation to security, the implications of technological or political progress or the lack thereof. This holds in particular for new challenges to come. These are harder to understand and to categorize; their development is difficult to predict. To mitigate this problem and to enable more foresight, The Secure Information Society provides an interdisciplinary spotlight onto some new and unfolding aspects of the uneasy relationship between information technology and information society, to aid the dialogue not only in its current and ongoing struggle, but to anticipate the future in time and prepare perspectives for the challenges ahead.

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Advanced methods for small batch robotic machining of hard materials

Advanced methods for small batch robotic machining of hard m...

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ROBOTIK 2012;7th German Conference on Robotics

作者： Dragoljub Surdilovic Hongqing Zhao Gerhard Schreck Joerg Krueger Fraunhofer Institute for Production Systems and Design Technology IPK - Berlin

关键词： Decision support systems Robots

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Ice Clean

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JOT-International Surface technology 2012年第2期5卷 32-35页

作者： Bilz, Martin Motschmann, Simon Uhlmann, Eckart Manufacturing technologies/Production systems Fraunhofer Institute for Production Systems and Design Technology (IPK) Berlin Germany

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