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Euromicro Conference on Software Engineering and Advanced Applications (SEAA)

作者： Uwe Pohlmann Jörg Holtmann Matthias Meyer Christopher Gerking Project Group Mechatronic Systems Design Fraunhofer Institute for Production Technology IPT Paderborn Germany Software Engineering Group University of Paderborn Paderborn Germany

Future smart systems will provide functionality by dynamically interacting with each other in cyber-physical systems. Such interactions require a message-based coordination under hard real-time constraints. This is realized by complex software, which combines discrete, state-based behavior with continuous behavior controlling the dynamics of the physical system parts. The development methods and tools for these kinds of software are not well integrated so far. For the modeling and simulation of physical and continuous control behavior, Modelica can be used. For modeling the discrete coordination behavior, MECHATRONICUML (MUML) can be used, which in addition offers a formal verification of safety requirements like deadlock-freedom of interactions, for example. We introduce in this paper an automatic transformation for formally verified MUML models into Modelica to ensure that the discrete state-based software correctly interacts with the continuous control software, physical parts, and a plant model. We illustrate this concept by means of a car-to-car coordination scenario.

关键词： Unified modeling language Mathematical model Real-time systems Clocks Analytical models Software Libraries

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Analysis of High Speed Bending Operations as Basis for Integrating Self-correcting Components to Increase Process Reliability

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Procedia Engineering 2014年 81卷 831-836页

作者： Ulf Damerow Mikhail Borzykh Dmitri Tabakajew Waldemar Schaermann Werner Homberg Ansgar Trächtler Forming and Machining Technology (LUF) University of Paderborn Warburger Str. 100 33098 Paderborn Germany Fraunhofer Institute for Production Technology (IPT) – Project group Mechatronic Systems Design Zukunftsmeile 1 33102 Paderborn Germany

When employing forming processes like punch bending for producing parts for electrical connection technology, unintended geometrical deviations can occur. Currently, the manual setup and adjustment of the bending machines is based on operator experience and is a highly time-consuming and expensive process. Furthermore the unintentional geometrical deviations lead to high scrap rates and long downtimes for the production machines. To solve these problems, self-correcting control strategies based on a closed-loop control approach are thus under development. In combination with additional measurement devices and actuators, it will be possible to take corrective action during the process so as to guarantee a consistent product quality on a continuous basis.

关键词： Metal parts Punch-bending process Self-correcting strategies

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Concept for a Self-correcting Sheet Metal Bending Operation

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Procedia technology 2014年 15卷 439-446页

作者： U. Damerow D. Tabakajew M. Borzykh W. Schaermann W. Homberg A. Trächtler Forming and Machining Technology (LUF) University of Paderborn Warburger Str. 100 33098 Paderborn Germany Fraunhofer Institute for Production Technology (IPT) – Project group Mechatronic Systems Design Zukunftsmeile 1 33102 Paderborn Germany

Geometrical deviations can appear in the production of plug contacts used in electrical connection technology and in fittings for the furniture industry. The reasons for this can be a variation in the properties of the semi-finished product, or wear phenomena on the forming machine itself or on the bending tools. When geometrical deviations appear, the process parameters normally have to be adjusted manually. Finding the most appropriate process parameters is currently done manually and is thus very time consuming. In order to reduce the scrap rate and the setup time for production scenarios, a concept for self-correcting bending operations is being developed using the V-model of the VDI guideline 2206. In this case, the V-model will make it possible to set up a self-correcting control strategy consisting of a closed-loop control approach, measurement devices and actuators. Having implemented these components in the forming machines, it will be possible to recognize geometrical deviations automatically and to take corrective action during production, aiming at a reduction of the scrap rate and setup-time.

关键词： self-correcting process punch bending continuous bending process design methodology

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Vision based fire detection using colour variance

Vision based fire detection using colour variance

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IASTED International Conference on Signal Processing, Pattern Recognition and Applications, SPPRA 2013

作者： Ajami, Mohamad Menevidis, Zaharya Fraunhofer IPK Institute for Production Systems and Design Technology Pascalstrasse 8-9 D-12384 Berlin Germany

In recent years, there have been a variety of attempts in research and industry to solve various problems by using the non-contact detection and interpretation possibilities of computer vision, as one image offers the floor to analyse different causes and sources in parallel. It is logical to apply an integrated approach via image and video not only to venture into new and innovative fields, but also to optimize and improve existing solutions with other sensors and to solve contemporary problems. In this paper, we will deal with the integrated approach for optimizing and improving fire detection. The detection path is going to be solely based on the colour features of household fires in addition to a colour independent feature of fire that owes to enhance the detection result. The end goal is to achieve real time fire detection and obtain a low false positive rate.

关键词： Fires

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Interplay of styling, design and service performance in developing Product-Service systems

Interplay of styling, design and service performance in deve...

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International Conference on Concurrent Enterprising

作者： Konrad Exner Lisa Hagedorn Kai Lindow Rainer Stark Haygazun Hayka Chair of Industrial Information Technology Technische Universität Berlin Berlin Germany Konrad Division of Virtual Product Creation Fraunhofer Institute for Production Systems and Design Technology Berlin Germany

New innovations are a decisive competitive advantage in today's global markets. Besides technical improvements the extension of classical product centred offerings with services to a provider of individual solution offers tremendous benefits. Furthermore, an exceptional product styling enables emotionally added value. Developing these offerings requires a joint and structured collaboration among the stakeholders, e.g. stylists, designers and engineers, already in the early phases. In practice, this can evoke a number of difficulties due to differences in working processes and philosophies of the different stakeholders. In order to face this challenge, the design process of offering development needs to be investigated. Furthermore, new methods and processes have to be developed. This paper describes an investigation of the different methods in developing a product focusing on stylists and engineers. Additionally, it describes the investigation of the challenges that occur during the development of Product-Service systems. Based on survey results a new approach is presented which is in turn validated with a use case. Eventually, an integrated offering development process is proposed.

关键词： Product development Companies Product design Technological innovation Industries Guidelines Haptic interfaces

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Investigation of dry-EDM micro drilling for high performance ceramics 13

Investigation of dry-EDM micro drilling for high performance...

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13th International Conference of the European Society for Precision Engineering and Nanotechnology, EUSPEN 2013

作者： Uhlmann, E. Schimmelpfennig, T.-M. Fraunhofer Institute for Production Systems and Design Technology Germany

ISBN: (纸本)9780956679024

Due to its thermal working principle allowing an almost force free machining independent of the material's mechanical properties, Electrical Discharge Machining (EDM) is a well established production technique for manufacturing micro holes. Especially when machining ceramics, a material group that is predestined for the application within the field of micro technology, EDM is of increasing importance. However, the production of precise micro holes with complex geometries and high aspect ratios is associated with a lot of challenges. High tool electrode wear, a small material removal rate and the increasing importance of flushing at high aspect ratios and small gap widths can be observed during this machining process. The paper shows investigations concerning the manufacturing of micro holes with diameters of around 350 μm in TiN ceramic probes with a thickness of 1 mm by dry-EDM. The dry-EDM micro drilling process with compressed air as dielectric medium is introduced. Additionally, experimental results of a technological optimization of main process parameters are shown, resulting in a reduction of the machining time tero and the relative tool wear ?. The technological parameters were optimized using a design of Experiments method (DoE) by varying the EDM process parameters discharge-capacitance Ce, no-load- voltage u0, ontime ton and offtime toff.

关键词： Capacitance

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Enabling Product Development Engineers to Select and Combine Methods for Sustainable design

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Procedia CIRP 2014年 15卷 413-418页

作者： Tom Buchert Alexander Kaluza Friedrich A. Halstenberg Kai Lindow Haygazun Hayka Rainer Stark Technische Universität Berlin Office PTZ4 Pascalstr. 8-9 10707 Berlin Germany Fraunhofer Institute Production Systems and Design Technology Pascalstr. 8-9 10707 Berlin Germany

A broad range of engineering methods, from simple checklists to sophisticated analytical tools, has been introduced to support the development of more sustainable products. Nevertheless, a lack of holistic approaches, which support the entire product creation process, can be observed. Combining the advantages of different existing methods could enable a rather continuous decision support. This paper presents an analysis and a categorization of current tools. On this foundation a process-based approach for method selection and combination is derived. By determining the concrete output of a method it becomes possible to use this information for defining sustainability milestones in project management. Hence, the allocation of design methods to different phases of the product creation process can be performed more intuitively and a combination of methods is encouraged. In order to test this approach, an exemplary redesign of a turbocharger has been conducted. From a pool of 50 methods nine are systematically selected and applied in order to check whether the selection was successful or not.

关键词： design methods Sustainability Product development Method selection Decision support Sustainable engineering

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Reference Ontologies to Support the Development of New Product-Service Lifecycle systems

Reference Ontologies to Support the Development of New Produ...

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IFIP WG 5.7 International Conference on Advances in production Management systems, APMS 2014

作者： Palmer, Claire Urwin, Esmond Neil Pinazo-Sánchez, Jose Miguel Cid, Francisco Sánchez Pajkovska-Goceva, Sonja Young, Robert Ian Marr Wolfson School of Mechanical and Manufacturing Engineering Loughborough University Loughborough Leicestershire United Kingdom Ainia centro tecnológico Parque tecnológico de Valencia Avinguda de Benjamin Franklin 5-11 46980 Paterna Valencia Spain Instituto Tecnológico de Informática Camino de Vera s/n Edif. 8G Acceso B CP 46022 Valencia Spain Fraunhofer Institute for Production Systems and Design Technology IPK Pascalstraße 8-9 10587 Berlin Germany

ISBN: (纸本)9783662447352

In competitive and time sensitive market places, organisations are tasked with providing Product Lifecycle Management (PLM) approaches to achieve and maintain competitive advantage, react to change and understand the balance of possible options when making decisions on complex multi-faceted problems, Global production Networks (GPN) is one such domain in which this applies. When designing and configuring GPN to develop, manufacture and deliver product-service provision, information requirements that affect decision making become more complex. The application of reference ontologies to a domain and its related information requirements can enhance and accelerate the development of new product-service lifecycle systems with a view towards the seamless interchange of information or interoperability between systems and domains. This paper presents (i) preliminary results for the capture and modelling of end-user information and (ii) an initial higher level reference core ontology for the development of reference ontologies to ameliorate product-service lifecycle management for GPN. © IFIP International Federation for Information Processing 2014.

关键词： Interoperability

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Continuous objective-based control for self-optimizing systems with changing operation modes

Continuous objective-based control for self-optimizing syste...

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European Control Conference (ECC)

作者： Jan Henning Keßler Martin Krüger Ansgar Trächtler Universitat Paderborn Paderborn Nordrhein-Westfalen DE Project Group Mechatronic Systems Design Fraunhofer Institute for Production Technology IPT Paderborn Germany Heinz Nixdorf Institute University of Paderborn Control Engineering and Mechatronics Paderborn Germany

ISBN: (纸本)9781479947287

Self-optimization enables technical systems to adapt their behavior to varying environmental conditions and changing operation modes. Objective functions serve as evaluation criteria for the system behavior. In this paper we present a novel approach of an objective-based controller. This controller is based on Pareto sets, which are solutions of multiobjective optimization problems and computed offline. The controller can be used to continuously adjust the system behavior by computing optimal configurations out of the Pareto sets without solving an optimization problem at runtime. The goal of the controller is to drive the objective values toward a desired relative weighting. Furthermore, the controller is able to cope with varying operation modes, which arise in case of component faults, for example. For each operation mode an entire Pareto set is computed separately. For designing the objective-based controller we use a simplified model of the closed-loop system. The objective values are approximated at runtime by means of a lowpass filter. An active suspension system affected by unknown track excitations serves as an application example. We use a particular control reconfiguration approach in case of an actuator fault as a change of the operation mode. Finally, simulations with a nonlinear model of the system validate our approach.

关键词： Optimization Actuators Suspensions Linear programming Computational modeling Vectors

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Machining of microfluidic structures for biotechnological components

Machining of microfluidic structures for biotechnological co...

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28th Annual Meeting of the American Society for Precision Engineering, ASPE 2013

作者： Uhlmann, Eckart Oberschmidt, Dirk Hein, Christoph Mahr, Frederik Department Micro Production Engineering Fraunhofer-Institute Production Systems and Design Technology Berlin Germany

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