Agricultural Structures and Mechanization

In our globalized world, the need to produce quality and safe food has increased exponentially in recent decades to meet the growing demands of the world population. This expectation is being met by acting at multiple levels, but mainly through the introduction of new technologies in the agricultural and agri-food sectors. In this context, agricultural, livestock, agro-industrial buildings, and agrarian infrastructure are being built on the basis of a sophisticated design that integrates environmental, landscape, and occupational safety, new construction materials, new facilities, and mechanization with state-of-the-art automatic systems, using calculation models and computer programs. It is necessary to promote research and dissemination of results in the field of mechanization and agricultural structures, specifically with regard to farm building and rural landscape, land and water use and environment, power and machinery, information systems and precision farming, processing and post-harvest technology and logistics, energy and non-food production technology, systems engineering and management, and fruit and vegetable cultivation systems. This Special Issue focuses on the role that mechanization and agricultural structures play in the production of high-quality food and continuously over time. For this reason, it publishes highly interdisciplinary quality studies from disparate research fields including agriculture, engineering design, calculation and modeling, landscaping, environmentalism, and even ergonomics and occupational risk prevention

Design and Application of Electrical Machines

Electrical machines are one of the most important components of the industrial world. They are at the heart of the new industrial revolution, brought forth by the development of electromobility and renewable energy systems. Electric motors must meet the most stringent requirements of reliability, availability, and high efficiency in order, among other things, to match the useful lifetime of power electronics in complex system applications and compete in the market under ever-increasing pressure to deliver the highest performance criteria. Today, thanks to the application of highly efficient numerical algorithms running on high-performance computers, it is possible to design electric machines and very complex drive systems faster and at a lower cost. At the same time, progress in the field of material science and technology enables the development of increasingly complex motor designs and topologies. The purpose of this Special Issue is to contribute to this development of electric machines. The publication of this collection of scientific articles, dedicated to the topic of electric machine design and application, contributes to the dissemination of the above information among professionals dealing with electrical machines

Development of a CO2_{2}e quantification method and of solutions for reducing the greenhouse gas emissions of construction machines = Entwicklung einer CO2_{2}e Quantifizierungsmethode und von Lösungen zur Reduzierung von Treibhausgasemissionen in Baumaschinen

Motiviert durch die globale Erwärmung konzentriert sich diese Arbeit auf die Entwicklung einer Quantifizierungsmethode für Treibhausgas (CO$_{2}$e) Emissionen von Baumaschinen. Im Rahmen dieser Arbeit wird eine Methode vorgestellt, welche identifizierte Forschungslücken schließt, die durch die Analyse von Maßnahmen aus unterschiedlichen Industrien und von existierenden CO$_{2}$ Quantifizierungsmethoden abgeleitet worden sind. Dabei berücksichtigt die Methode mit Hilfe von Einflussfaktoren aus sechs Säulen CO$_{2}$e Reduktionspotentiale, welche lauten: Maschineneffizienz, Prozesseffizienz, Energieträger, Betriebseffizienz, Materialeffizienz und CO$_{2}$e Abscheidung und Lagerung. Durch den Einsatz der Methode auf repräsentative Bauanwendungen für Europa für drei Zeitschienen Vergangenheit-Gegenwart-Zukunft wird gezeigt, dass diese für beliebige Bauanwendungen und Zeitschienen anwendbar ist. Beim Vergleichen der Ergebnisse aus zwei Zeitschienen ist es möglich die Reduktion oder Steigerung an Treibhausgasemissionen zu erfassen. Am Beispiel von ausgewählten Baumaschinen wird gezeigt, dass die Methode gültig ist und damit Aussagen über bestimmten CO$_{2}$e Reduktionsmaßnahmen ermöglicht werden. Zum Schluss werden Transformationslösungen vorgeschlagen, um die Treibhausgasemissionen von Baumaschinen zu reduzieren. Dabei wird flüssiges Methan als alternativer Energieträger vorgeschlagen, der die CO$_{2}$e Emissionen bis zu 84 % reduzieren kann. Die zusätzliche Kombination mit einem Brennstoffzellenantrieb können die CO$_{2}$e Emission bis zu 89 % reduzieren. Als dritte Lösung wird der Einsatz eines CO$_{2}$ Abscheide- und Speichersystems vorgeschlagen, welches die CO$_{2}$e Emissionen von fossilen Diesel bis zu 82 % reduziert. Durch Kombination der drei vorgeschlagenen Lösungen wird aus der mobilen Arbeitsmaschine eine Maschine, welche die Atmosphäre von Treibhausgas reinigt, da negative CO$_{2}$e Emissionen damit entstehen

Ninteenth Aerospace Mechanisms Symposium

The proceedings of the 19th Aerospace Mechanisms Symposium are reported. Technological areas covered include space lubrication, bearings, aerodynamic devices, spacecraft/Shuttle latches, deployment, positioning, and pointing. Devices for spacecraft docking and manipulator and teleoperator mechanisms are also described

Design study and evaluation of a hypergolic engine for a space power system, phase 2 Final report, 1 Jul. 1964 - 10 Feb. 1966

Design feasibility of hypergolic engine for space power syste

Time Localization of Abrupt Changes in Cutting Process using Hilbert Huang Transform

Cutting process is extremely dynamical process influenced by different phenomena such as chip formation, dynamical responses and condition of machining system elements. Different phenomena in cutting zone have signatures in different frequency bands in signal acquired during process monitoring. The time localization of signal’s frequency content is very important. An emerging technique for simultaneous analysis of the signal in time and frequency domain that can be used for time localization of frequency is Hilbert Huang Transform (HHT). It is based on empirical mode decomposition (EMD) of the signal into intrinsic mode functions (IMFs) as simple oscillatory modes. IMFs obtained using EMD can be processed using Hilbert Transform and instantaneous frequency of the signal can be computed. This paper gives a methodology for time localization of cutting process stop during intermittent turning. Cutting process stop leads to abrupt changes in acquired signal correlated to certain frequency band. The frequency band related to abrupt changes is localized in time using HHT. The potentials and limitations of HHT application in machining process monitoring are shown

Volume 2 – Conference: Wednesday, March 9

10. Internationales Fluidtechnisches Kolloquium:Group 1 | 2: Novel System Structures Group 3 | 5: Pumps Group 4: Thermal Behaviour Group 6: Industrial Hydraulic