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In Zeiten der Krise kommt den Controllern eine wachsende Bedeutung im Unternehmen zu. Controller gehören auch in wirtschaftlich turbulenten Situationen zu den gesuchten Fachleuten. Die Autoren behandeln die Frage: Welche Anforderungen in fachlicher sowie persönlicher Sicht werden an den Controller gestellt und wie stark verändern sich seine Aufgaben.
The development of mobile robotic systems is a demanding task regarding its complexity, required resources and skills in multiple fields such as software development, artificial intelligence, mechanical design, electrical engineering, signal processing, sensor technology or control theory. This holds true particularly for soccer playing robots, where additional aspects like high dynamics, cooperation and high physical stress have to be dealt with. In robot competitions such as RoboCup, additional skills in the domains of team, project and knowledge management are of importance.
"Entdecken wir die Welt"
(2007)
Wer ein Studium beginnt, begibt sich auf einen neuen, noch ungekannten Weg in seinem Leben. Viel gilt es erst einmal zu lernen, damit Wissen und Können zu kompetentem Handeln befähigen und im späteren Berufsalltag zur Anwendung gelangen können. Neue Wissensinhalte sind das eine, das andere sind persönliche Erfahrungen, die in der kurzen Zeit eines Studiums ein Leben bereichern und prägen können.
Der Behindertenspitzensport hat sich in den letzten Jahren – nicht nur leistungsmäßig – in hohem Maße weiterentwickelt. Öffentlichkeit und Medien widmen ihm größere Aufmerksamkeit und bringen den Athleten mehr Akzeptanz entgegen als in der Vergangenheit. Auch der werbliche Einsatz dieses Sportbereichs erfährt gute Bewertungen. Laut aktuellen Umfragen in der Bevölkerung lässt sich durch die Schaltung von Anzeigen mit behinderten Spitzenathleten das Unternehmensimage positiv beeinflussen.
Erst seit wenigen Jahren binden Unternehmen den Behindertenspitzensport in ihre Kommunikationsaktivitäten ein. Da die Anzahl der damit arbeitenden Firmen zudem gering ist, lagen bislang kaum Informationen und Erfahrungswerte vor, die anderen an einem Engagement in diesem Bereich Interessierten Orientierungshilfen bieten konnten.
Problem Fersenbeinfraktur
(2007)
Purpose – To describe the development of a novel polyether(meth)acrylate-based resin material class for stereolithography with alterable material characteristics.
Design/methodology/approach – A complete overview of details to composition parameters, the optimization and bandwidth of mechanical and processing parameters is given. Initial biological characterization experiments and future application felds are depicted. Process parameters are studied in a commercial 3D systems Viper stereolithography system, and a new method to determine these parameters is described herein.
Findings – Initial biological characterizations show the non-toxic behavior in a biological environment, caused mainly by the (meth)acrylate-based core components. These photolithographic resins combine an adjustable low Young’s modulus with the advantages of a non-toxic (meth)acrylate-based process material. In contrast to the mostly rigid process materials used today in the rapid prototyping industry, these polymeric formulations are able to fulfll the extended need for a soft engineering material. A short overview of sample applications is given.
Practical implications – These polymeric formulations are able to meet the growing demand for a resin class for rapid manufacturing that covers a bandwidth from softer to stiffer materials.
Originality/value – This paper gives an overview about the novel developed material class for stereolithography and should be therefore of high interest to people with interest in novel rapid manufacturing materials and technology.
Holzfahrrad im Eigenbau
(2007)
Kompakt-Training E-Business
(2007)
Einer Moderne in der Tradition der Aufklärung, zweckrational gestimmt und zum Pragmatischen geneigt, muß Repräsentatives verdächtig vorkommen. Die Verpflichtung zu einer Wahrheit, die um so lauterer erscheint, je schmuck- und glanzloser sie daherkommt, beargwöhnt das Repräsentative bestenfalls als Schnickschnack, in weniger günstigen Stunden als Einschüchterung oder Manipulation.
The article presents a solution to detect rotor position at stand still condition for all types of permanent magnet brushless dc motors. The solution provides both secure and fast method for starting of the brushless motor, that is independent on the sensorless control scheme used. Nonlinearities found in standard three phase permanent magnet dc motor are used to derive the rotor position at stand still. The described solution assumes that there is availability of the neutral point of the three phase star motor windings.
Das Fraunhofer Institut für Intelligente Analyse- und Informationssysteme (IAIS) entwickelt im Projekt ProfiBot ein modulares Roboterbaukastensystem für die berufliche Mechatronikausbildung. Es wird durch das Bundesministerium für Bildung und Forschung (BMBF) gefördert. Diese Arbeit hat die Entwicklung eines Systems zum Ziel, mit dem es möglich ist, einen ProfiBot-Roboter an einer Dockingstation zu positionieren und eine Ladung der Akkus durchzuführen. Dies umfasst die Entwicklung der Algorithmen und Architekturen zur Navigation, die Konstruktion und die Herstellung der Dockingstation. Das System wurde so konzipiert, dass es sich gegenüber verschiedenen Störfaktoren, wie beispielsweise unterschiedlichen Lichtverhältnissen, Bodenbeschaffenheiten oder markanten Objekten im Raum, robust verhält.
Swedish wheeled mobile robots have remarkable mobility properties allowing them to rotate and translate at the same time. Being holonomic systems, their kinematics model results in the possibility of designing separate and independent position and heading trajectory tracking control laws. Nevertheless, if these control laws should be implemented in the presence of unaccounted actuator saturation, the resulting saturated linear and angular velocity commands could interfere with each other thus dramatically affecting the overall expected performance. Based on Lyapunov’s direct method, a position and heading trajectory tracking control law for Swedish wheeled robots is developed. It explicitly accounts for actuator saturation by using ideas from a prioritized task based control framework.
Programmable logic controllers (PLCs) have traditionally been used on numerous machines for control of the various processing and manufacturing steps. In response to an initiative by the Expert Committee Chemical Industry (FA CH), suitable metrics have been defined in order to permit rapid static analysis of comprehensive PLC programs. A tool was developed for this purpose which is also able to determine quality criteria. Additional to seven of the new metrics five metrics derived from Halstead and McCabe are used to determine the quality-criteria: testability, self-description, legibility and simplicity. New concepts were developed to determine and to calculate these criteria. The results are documented in hyper-language files with links to the called modules and control-graphs for each function. The tool was validated by three voluminous PLC-programs, two are from industrial projects.
A Bicycle Simulator Based on a Motion Platform in a Virtual Reality Environment - FIVIS Project
(2007)
In this contribution a machine vision inspection system is presented which is designed as a length measuring sensor. It is developed to be applied to a range of heat shrink tubes, varying in length, diameter and color. The challenges of this task were the precision and accuracy demands as well as the real-time applicability of the entire approach since it should be realized in regular industrial line production. In production, heat shrink tubes are cut to specific sizes from a continuous tube. A multi-measurement strategy has been developed, which measures each individual tube segment several times with sub pixel accuracy while being in the visual field. The developed approach allows for a contact-free and fully automatic control of 100% of produced heat shrink tubes according to the given requirements with a measuring precision of 0.1mm. Depending on the color, length and diameter of the tubes considered, a true positive rate of 99.99% to 100% has been reached at a true negative rate of > 99.7.
In the presented project, new approaches for the prevention of hand movements leading to hazards and for non-contact detection of fingers are intended to permit comprehensive and economical protection on circular saws. The basic principles may also be applied to other machines with manual loading and/or unloading. Two new detection principles are explained. The first is the distinction between skin and wood or other material by spectral analysis in the near infrared region. Using LED and photodiodes it is possible to detect fingers and hands reliable. With a kind of light curtain the intrusion into the dangerous zone near the blade can be prevented. The second principle is video image processing to detect persons, arms and fingers. In the first stage of development the detection of upper limb extremities within a defined hazard area by means of a computer based video image analysis is investigated.