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Quality-oriented Design of Rotor Assembly Strategies for Electric Drive Production Systems

Procedia CIRP 2015年 36卷 141-146页

作者： Marcello Colledani Anteneh Yemane Daniel Coupek Armin Lechler Politecnico di Milano Mechanical Engineering Department Via la Masa 1 20156 Milano Italy Institute for Control Engineering of Machine Tools and Manufacturing Units (ISW) Seidenstraße 36 70174 Stuttgart Germany

Electric mobility is an emerging industrial sector that requires innovative quality control methods as common manufacturing and testing methods of combustion engines cannot be transferred directly to electric motors. This paper presents new solutions for the quantitative evaluation of quality-oriented rotor assembly strategies in electric drive production systems. The proposed methods assist the analysis of productivity and quality performance of two different assembly strategies namely selective assembly and sequential assembly. The impacts of these approaches are validated within a real industrial context, where state of the art quality and process control technologies show strong limitations. Experimental results have shown that the application of the proposed strategies yield a significant improvement in the production rate of conforming parts of the system. Moreover, the general applicability of these approaches to similar industrial problems encourages their adoption for defect reduction and elimination thus paving the way to zero-defect manufacturing paradigm.

关键词： Product Quality Defect elimination Electric drive assembly strategy

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Introduction to hardware Trojan detection methods 15

Introduction to hardware Trojan detection methods

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Design, Automation and Test in Europe Conference and Exhibition

作者： Julien Francq Florian Frick Airbus Defence & Space – CyberSecurity Elancourt Cedex France University of Stuttgart Institute for Control Engineering of Machine Tools and Manufacturing Units (ISW) Stuttgart Germany

ISBN: (纸本)9783981537048

Hardware Trojans (HTs) are identified as an emerging threat for the integrity of Integrated Circuits (ICs) and their applications. Attackers attempt to maliciously manipulate the functionality of ICs by inserting HTs, potentially causing disastrous effects (Denial of Service, sensitive information leakage, etc.). Over the last 10 years, various methods have been proposed in literature to circumvent HTs. This article introduces the general context of HTs and summarizes the recent advances in HT detection from a French funded research project named HOMERE. Some of these results will be detailed in the related special session.

关键词： Hardware Production Field programmable gate arrays Logic testing Trojan horses Application specific integrated circuits

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Self-optimizing Production Systems

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Procedia CIRP 2016年 41卷 417-422页

作者： Eike Permin Felix Bertelsmeier Matthias Blum Jennifer Bützler Sebastian Haag Sinem Kuz Denis Özdemir Sebastian Stemmler Ulrich Thombansen Robert Schmitt Christian Brecher Christopher Schlick Dirk Abel Reinhart Poprawe Peter Loosen Wolfgang Schulz Günther Schuh Fraunhofer Institute for Production Technology (IPT) Steinbachstraße 17 52064 Aachen Germany Laboratory for Machine Tools and Production Engineering (WZL) of RWTH Aachen University Steinbachstraße 53 52074 Aachen Institute for Industrial Management (FIR) at RWTH Aachen University Campus-Boulevard 55 52074 Aachen Institute of Industrial Engineering and Ergonomics (IAW) of RWTH Aachen Bergdriesch 27 52062 Aachen Institute of Automatic Control (IRT) Steinbachstraße 54 52074 Aachen Fraunhofer Institute for Laser Technology (ILT) Steinbachstraße 15 52074 Aachen Germany Chair for Laser Technology (LLT) at RWTH Aachen University Steinbachstrasse 15 52074 Aachen Germany Chair for Technology of Optical Systems (TOS) at RWTH Aachen University Steinbachstrasse 15 52074 Aachen Germany Department Nonlinear Dynamics of Laser Processing (NLD) at RWTH Aachen University Steinbachstrasse 15 52074 Aachen Germany

Today's manufacturers are facing numerous challenges such as highly entangled and interconnected supply chains, shortening product lifecycles and growing product complexity. They thus feel the need to adjust and adapt faster on all levels of value creation. Self-optimization as a basic principle appears a promising approach to handle complexity and unforeseen disturbances within supply chains, machines and processes. Therefore it will improve the resilience and competitiveness of manufacturing companies. This paper gives an introduction to the concept of self-optimizing production systems. After a short historical review, the different levels of value creation from supply chain design and management to manufacturing and assembly are analyzed considering their specific demands and needs for self-optimization. Examples from each of these levels are used to illustrate the concept of self-optimization as well as to outline its potential for flexibility and productivity. This paper closes with an outlook on the current scientific work and promising new fields of action.

关键词： Artificial intelligence Optimization control Management

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Overview of hardware trojan detection and prevention methods

Overview of hardware trojan detection and prevention methods

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European Conference on Circuit Theory and Design, ECCTD

作者： Julien Francq Florian Frick Airbus Defence & Space - CyberSecurity 1Bd Jean Moulin Elancourt Cedex France University of Stuttgart Institute for Control Engineering of Machine Tools and Manufacturing Units (ISW) Stuttgart Germany

关键词： Hardware Trojan horses Integrated circuits Conferences Production Cryptography

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Analysis of CNC software modules regarding parallelization capability 24

Analysis of CNC software modules regarding parallelization c...

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24th International Conference on Flexible Automation and Intelligent Manufacturing, FAIM 2014

作者： Keinert, Matthias Kaiser, Benjamin Lechler, Armin Verl, Alexander Institute for Control Engineering of Machine Tools and Manufacturing Units University of Stuttgart Stuttgart70174 Germany

ISBN: (纸本)9781605951737

The software design of current CNC systems is of limited suitability for real parallel execution on multicore systems. Even though CNC systems are rudimentarily designed in a modular way, a good load balancing and therefore an efficient use of multiple processor cores is not satisfactorily to be accomplished, as the modularization is not sophisticated enough. A parallelization of CNC functions and algorithms would remedy this deficit. This paper presents an analysis on which parts of a CNC system show the capability for parallelization. Furthermore an approach is presented on how the parallelization of a specific function, namely the look-ahead function, can be accomplished. © Copyright 2014 by DEStech Publications, Inc. All rights reserved.

关键词： Software design

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The Development of Dislodgement Free Diamond Electroplated Wheel for engineering Ceramic Grinding Processes

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Procedia CIRP 2015年 31卷 363-368页

作者： Geng Zhi Xuekun Li Sebastian Wolf Yiming(Kevin) Rong Department of Mechanical Engineering Tsinghua University Beijing 100084 China Beijing Key Lab of Precision/Ultra-precision Manufacturing Equipments and Control Tsinghua University Beijing 100084 China Laboratory for Machine Tools and Production Engineering RWTH Aachen University Aachen 52074 Germany Department of Mechanical Engineering Worcester Polytechnic Institute Worcester MA 01609 US

The engineering ceramic grinding process with an electroplated diamond wheel is significantly influenced by the detrimental effect of the grain dislodgement which causes surface roughness degradation and tool life decrease. Therefore, the thickness of the electroplated bond layer must be large enough to provide sufficient micro-bonding force to overcome the single grain micro-cutting force during grinding. However, large electroplated bond layer thickness hampers the protrusion condition of the grains, and causes insufficient active grains. The conventional „trial and error‟ method based on heuristic knowledge currently appears to be the only way in developing electroplated diamond wheels. The difficulty of a deterministic wheel design lies in the lack of an integrated model to predict micro-bonding force and the protrusion conditions of all diamond grains on the wheel surface for given a grain size, dimensional distribution, and bond layer thickness. In this paper, the digital grinding wheel model is developed for single layer electroplated diamond wheels by simulating each wheel fabrication procedure numerically. The model provides a 3D view of the wheel surface condition and micro-bonding force, protrusion information in correlation with the wheel design parameters, e.g. grain size, dimensional distribution and bond layer thickness. Based on the analysis of the micro-cutting force on a single grain during grinding, the optimal electroplated bond layer thickness can be determined. Finally, a grinding experiment for an alumina engineering ceramic is carried out to verify the efficacy of the model in the development of dislodgement free diamond wheels.

关键词： Grinding wheel Diamond Ceramic

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Continuous learning support vector machine to estimate stability lobe diagrams in milling 24

Continuous learning support vector machine to estimate stabi...

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24th International Conference on Flexible Automation and Intelligent Manufacturing, FAIM 2014

作者： Friedrich, Jens Hartmann, Henning Verl, Alexander Lechler, Armin Institute for Control Engineering of Machine Tools and Manufacturing Units University of Stuttgart StuttgartD-70174 Germany

ISBN: (纸本)9781605951737

The productivity of milling processes is limited by the occurrence of chatter vibrations. The correlation of the maximum stable cutting depth and the spindle speed can be shown in a stability lobe diagram (SLD). Today it is a great effort to estimate the SLD. Lot's of experiments are necessary to measure the SLD or derive a detailed mathematical model to calculate the SLD. Moreover not only cutting depth, but also the cutting width should be taken into account. This paper presents an approach to learn the multidimensional stability lobe diagram (MSLD) during the production based on continuously measured signals using a support vector machine. The support vector machine is extended to make it capable for continuous learning and time-variant systems. The process conditions are classified as stable or unstable. The learned MSLDs are very similar to the analytically calculated MSLDs. Changes over time in the system dynamics can also be learned by the proposed algorithm. © Copyright 2014 by DEStech Publications, Inc. All rights reserved.

关键词： Support vector machines

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Multidimensional Analysis of Process Chains Regarding the Resource-efficient Manufacturing of Hybrid Structures

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Procedia CIRP 2015年 26卷 595-600页

作者： C. Fanghänel A. Rautenstrauch C. Symmank J. Katzenberger M. Putz V. Kräusel U. Götze B. Awiszus Fraunhofer Institute for Machine Tools and Forming Technology Reichenhainer Straße 88 09126 Chemnitz Germany Technische Universität Chemnitz Professorship for Machine Tools and Forming Technology Reichenhainer Straße 70 09126 Chemnitz Germany Technische Universität Chemnitz Professorship Management Accounting and Control Thüringer Weg 7 09126 Chemnitz Germany Technische Universität Chemnitz Professorship Virtual Production Engineering Reichenhainer Straße 70 09126 Chemnitz Germany

One of the leading topics in the automotive industry as well as in the aircraft and aerospace sector is the use of lightweight structures for weight reduction. For this purpose, hybrid materials, e.g. metal-plastic structures, are of essential importance. Despite the high technological challenge, the manufacturing techniques still provide versatile development potential. Especially the integration of separate production techniques in one single tool opens new possibilities of successfully designing a resource-efficient process chain for hybrid components, suitable for series production. Within the Cluster of Excellence “MERGE Technologies for Multifunctional Lightweight Structures”, a modelling approach for the resource-efficient process design of the manufacturing of hybrid structures, which is based on a multidimensional analysis, will be developed. Besides the technical optimisation, the energy efficiency, the cost-effectiveness, the robustness of process chains as well as the maturity regarding series production will be considered during the entire development process. The paper will present main features of this modelling approach including a proposal for a systematic and structured procedure of a multidimensional analysis.

关键词： cost-effectiveness energy efficiency hybrid components maturity analysis resource-efficient process chain robustness

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Efficient Combination of Topology and Parameter Optimization

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Open Journal of Optimization 2014年第3期3卷 19-25页

作者： Yusheng Lin Zheng Sun Alexandru Dadalau Alexander Verl Institute for Control Engineering of Machine Tools and Manufacturing Units (ISW) University of Stuttgart Stuttgart Germany

This paper presents a combination method of Particle Swarm Optimization (PSO) and topology optimization. With this method a better result can be achieved compared with the sequential application of these two optimization methods. It inherits the ability in finding global optimum from PSO and also suits for discretized design domain. Some special schemes are used in order to provide higher computation efficiency. This method has only been tested with a convex optimization problem. The application in case of a concave problem will be a future study.

关键词： Topology Optimization Parameter Optimization Combination Optimization PSO Structure Design

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Aspects concerning the modeling of robots with increased dexterity 45

Aspects concerning the modeling of robots with increased dex...

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Joint Conference of ISR 2014 - 45th International Symposium on Robotics and Robotik 2014 - 8th German Conference on Robotics, ISR/ROBOTIK 2014

作者： Lapusan, C. Fodor, F. Csiszar, A. Verl, A. Brisan, C. Department of Mechatronics and Machine Dynamics Technical University of Cluj-Napoca Cluj-Napoca Romania Graduate School of Excellence Advanced Manufacturing Engineering University of Stuttgart Germany Institute for Control Engineering of Machine Tools and Manufacturing Units University of Stuttgart Stuttgart Germany

ISBN: (纸本)9783800736010

Robotic structures have been a subject to continuous innovation since their presence. This paper presents a new approach to solve the inverse kinematics problem of the "HIDRA" (HIghDexterityRoboticArm). A SimMechanics trunk model has been developed based on which a position control algorithm will be developed. The published experimental results, coming from numerical simulations, validate the similarity of our kinematic model, and our new approach of determining the lengths of the bellows. This new approach presents the correlation between the physical characteristics and the elongation provided by variable air pressure. © VDE VERLAG GMBH Berlin Offenbach.

关键词： Inverse problems

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