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Elektronik in der Fahrzeugtechnik
No full textDas Buch vermittelt die Grundlagen, um die Besonderheiten der Elektronik und Software im Kfz nicht nur zu kennen, sondern auch zu verstehen. Zusätzlich wird an Beispielen die Komplexität realer Systeme im Fahrzeug vorgeführt und gezeigt, welche Anwendungen durch die Elektronik erst möglich werden. Das Spannungsfeld zwischen Sicherheit, Zuverlässigkeit und Komplexität prägt in Verbindung mit branchenüblichen Abläufen das Vorgehen bei der Entwicklung, das ein in diesem Bereich tätiger Ingenieur verstehen muss
CubeSat mission for the observation of meteoroid impacts on Moon
No full textRecent progress in nanosatellite technologies allows to consider innovative new CubeSat missions for scientific purposes. We present and evaluate the design of a small and cost effective CubeSat mission to monitor lunar meteoroid impacts by detecting their optical flashes. The poster summarizes the results of a comprehensive survey of past and recent ground based and satellite based projects focussing on lunar impact monitoring and discusses important aspects of the proposed mission and various alternatives for their solutions. Several spacecraft orbits around Moon and their usefulness for lunar impact observation are studied. In addition, we discuss the environmental risks and challenges, which such spacecraft needs to face, mainly thermal management and radiation tolerance. Finally, we present and discuss the design an optical camera suitable to detect meteoroid impacts on the lunar surface.Poste
Design Rules for Hybrid Additive Manufacturing Combining Selective Laser Melting and Micromilling
No full textWe report on a comprehensive study to evaluate fundamental properties of a hybrid
manufacturing approach, combining selective laser melting and high speed milling, and to characterize
typical geometrical features and conclude on a catalogue of design rules. As for any additive
manufacturing approach, the understanding of the machine properties and the process behaviour as
well as such a selection guide is of upmost importance to foster the implementation of new machining
concepts and support design engineers. Geometrical accuracy between digitally designed and
physically realized parts made of maraging steel and dimensional limits are analyzed by stripe line
projection. In particular, we identify design rules for numerous basic geometric elements like walls,
cylinders, angles, inclinations, overhangs, notches, inner and outer radii of spheres, chamfers in build
direction, and holes of different shape, respectively, as being manufactured by the hybrid approach
and compare them to sole selective laser melting. While the cutting tool defines the manufacturability
of, e.g., edges and corners, the milling itself improves the surface roughness to Ra < 2 µm. Thus,
the given advantages of this hybrid process, e.g., space-resolved and custom-designed roughness
and the superior geometrical accuracy are evaluated. Finally, we exemplify the potential of this
particular promising hybrid approach by demonstrating an injection mold with a conformal cooling
for a charge socket for an electro mobil
Optical glass comprises oxides of e. g. aluminum, boron, phosphorus, tin, zirconium, potassium and cesium, and coloring oxides, for production of very large opitcal transmission components, e.g. lenses, prisms, or windows
No full text
Fabrication and Applications of Polymer Planar Bragg Grating Sensors based on Cyclic Olefin Copolymers
No full textThis contribution reviews recent advancements, current research and possible applications of polymer planar Bragg grating (PPBG) sensors with a focus on the utilization of cyclic olefin copolymer (COC) substrates. COC-PPBGs can be handled and fabricated efficiently by employing a single writing step procedure which features simultaneous generation of waveguide and Bragg grating structure within an injection molded substrate. The resulting photonic structures exhibit an attenuation as low as 1.2 dB cm-1 and a reflectivity up to 99 %. The potential of COC-PPBGs for high-temperature applications is proven by demonstrating temperature measurements up to 160 °C. Moreover, it is possible to employ single PPBGs for multidimensional stress and strain sensing or even three-dimensional shape reconstruction. Due to their excellent properties, it is feasible to integrate COC-PPBGs into commercial-grade carbon fiber reinforced polymer workpieces for structural health monitoring. Furthermore, utilization of appropriate coatings enables functionalization of PPBGs for refractive index sensing and thus biochemical applications. Beside the fabrication and characterization of COC-based PPBGs, this contribution exemplifies and reviews such applications
