This contribution presents an operating strategy for a novel valve structure for mobile machines’ working hydraulics which combines the flexibility and energetic benefits of individual metering with the functionality of common primary pressure compensation (IPC). The aim is to set up a system that uses a minimal amount of sensors and simple control algorithms. A control strategy theoretically described in /1/ is modified to facilitate the practical implementation on a mini excavator implement as a test rig. This test rig consists only of components that are currently available off-the-shelf to show that it is possible to develop an individual metering system under these economic restrictions. The novel is more energy efficient than common flow sharing systems but provides the same functionality. The control algorithm is experimentally evaluated in terms of functionality and energy consumption. Simulations show potential for further improvements.

The shift toward mobility have today created higher demands on companies, consultants, the right use of working methods, workplace strategies, the information sharing as well as the interaction and collaboration with different customers. If consultants are able to work effective outside the office, from everywhere and at any time regardless of location with the help of mobile technologies, companies can reduce unnecessary costs, gain market share and competitive advantages. This study examines how mobile technologies enable social interaction of IT consultants‟ mobile work. The purpose of this Master thesis is to identify IT consultants‟ mobile work and the existing implications in mobility today. The thesis will also bring up the set of problems with mobility to the surface and create a deeper understanding of IT consultants‟ mobile work and more knowledge about mobile technologies and how they can enable social interaction. The thesis‟ empirical foundation is derived from 18 interviews with representatives from; NaviPro, Sogeti and Logica. The interviews will provide the reader with a better understanding in; how mobile technologies can enable social interaction and which implications consultants face during their mobile work. The theoretical basis is composed from secondary data to receive an understanding and background to the problem area. The empirical data is then analyzed by means of presented theories which are also assumed in the preparation of the interviews. We have come to the conclusion that today‟s technology has failed to satisfy the consultants‟ social needs and that there are significant implications that can result in lack of face-to-face interaction, social and professional isolation and higher demands of constantly be reachable. However, with the access of laptops, smartphones and mobile broadband consultants can minimize following implications and perform more than 50% of their work and still be a productive and effective consultant. / Program: Masterutbildning i Informatik

This contribution presents an operating strategy for a novel valve structure for mobile machines’ working hydraulics which combines the flexibility and energetic benefits of individual metering with the functionality of common primary pressure compensation (IPC). The aim is to set up a system that uses a minimal amount of sensors and simple control algorithms. A control strategy theoretically described in /1/ is modified to facilitate the practical implementation on a mini excavator implement as a test rig. This test rig consists only of components that are currently available off-the-shelf to show that it is possible to develop an individual metering system under these economic restrictions. The novel is more energy efficient than common flow sharing systems but provides the same functionality. The control algorithm is experimentally evaluated in terms of functionality and energy consumption. Simulations show potential for further improvements.

Táto diplomová práca sa zaoberá vytvorením dynamického modelu mobilného pracovného stroja. Ciežom práce je vytvorenie blokového modelu pohonu štvorkolesového mobilného pracovného stroja. Model hydrostatického prevodu bol dodaný firmou Sauer-Danfoss. Model mobilného pracovného stroja bol vytvorený v programe MATLAB-Simulink. Dalšou časťou práce je výber typu riadenia hydrostatického prevodu a návrh riadiaceho algoritmu hydrostatického prevodu. Výstupom práce je blokový matematicko-fyzikálny model pohonu štvorkolesového mobilného pracovného stroja spolu s riadiacim algoritmom hydrostatického prevodu v prostredí MATLAB-Simulink.

Die Arbeitswelt befindet sich im Wandel. Globalisierungstendenzen sorgen für zunehmende internationale Verzahnungen beruflicher Arbeitsprozesse (Staar, Gurt & Janneck, 2019). Dies wird vor allem möglich durch die rasanten technologischen Entwicklungen im Bereich computergestützter Arbeit (Schaper, 2014). Daneben werden berufliche Mobilitätsanforderungen an die Beschäftigten zunehmend zum „Kennzeichen moderner Gesellschaften“ (Schneider & Ruppenthal, 2014, S. 80). Auch die Arbeitsstrukturen als solche unterliegen zum Teil erheblichen Veränderungen: So weichen Normalarbeitsverhältnisse immer stärker zugunsten flexiblerer Arbeitsformen (Rensmann & Gröpler, 1998). Gleichzeitig verändern sich familiäre Strukturen und Bezüge: So haben Doppelversorgermodelle, in denen beide Partner im Erwerbsleben tätig sind, das traditionelle Ernährermodell in vielen Bereichen abgelöst. Daneben steigt die familiäre Verantwortung für zu pflegende Angehörige – immer weniger jüngere Menschen sind für immer mehr ältere Menschen verantwortlich (Staar & Bamberg, 2011). Schließlich verschieben sich auch die Prioritäten im Hinblick auf die Verteilung von Erwerbsarbeit und Privatleben mit dem steigenden Wunsch, den Bereich der Nicht-Arbeit auszubauen und verschiedenen familiären, partnerschaftlichen oder individuellen Interessen und Verpflichtungen außerhalb der Erwerbsarbeit nachzukommen (ebd.). [...aus der Einleitung]