Relevant bibliographies by topics / Technische Mechanik

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers

Academic literature on the topic 'Technische Mechanik'

Author: Grafiati
Published: 4 June 2021
Last updated: 30 July 2024

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Journal articles on the topic "Technische Mechanik"

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Loose, Tobias, and Thomas Pospiech. "Regelungstechnische Labormodelle mit industriepraktischen Anwendungen für die Hochschullehre." at - Automatisierungstechnik 67, no. 2 (2019): 157–68. http://dx.doi.org/10.1515/auto-2018-0106.

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Zusammenfassung Regelungstechnik ist eine sehr reizvolle und anwendungsbezogene technische Disziplin. Durch die Regelungstechnik werden viele Fachbereiche wie Elektrotechnik, Antriebstechnik, Technische Mechanik und Konstruktionslehre zu einer funktionierenden Gesamtanlage verbunden. Dies stellt für Studierende oftmals eine Herausforderung dar, weil ein technisches Gesamtverständnis notwendig ist, um die Regelungstechnik zu verstehen. Labormodelle sind dazu sehr hilfreich, um dieses Verständnis aufzubauen. Dieser Beitrag zeigt eine Reihe von Labormodellen mit kostengünstigen Komponenten, um industriepraktische, regelungstechnische Fragestellungen zu bearbeiten.
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Renner, Barbara. "Book Review: Russel C. Hibbeler, Technische Mechanik." ZAMM 86, no. 10 (2006): 794. http://dx.doi.org/10.1002/zamm.200690043.

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Szalai, József. "Technische Festigkeiten der Pannonia Pappel (Populus x euramericana cv. Pannonia) und der Zerreiche (Quercus cerris L.)." Acta Silvatica et Lignaria Hungarica 1, no. 1 (2005): 93–103. http://dx.doi.org/10.37045/aslh-2005-0008.

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Im Institut für Technische Mechanik und Tragwerke der Westungarischen Universität wurde – durch die Unterstützung von OTKA (T 34107) (Ungarischer Förderungsfonds der Wissenschaftlichen Forschung)) – seit mehreren Jahren eine theoretische und experimentelle Untersuchung durchgeführt. Im Rahmen dieser Untersuchung werden die Grundlagen der statischen Bemessung von Holzkonstruktionselementen ausgearbeitet und jene Materialkonstanten für verschiedene Holzarten experimentell ermittelt, welche für eine theoretisch einwandfreie statische Bemessung benötigt werden. Bei der Bemessung von lasttragenden Holzkonstruktionen – besonders dann, wenn im geprüften Punkt ein zusammengesetzter Spannungszustand herrscht – braucht man eine anisotrope Festigkeitshypothese. Diese Festigkeitskriterien sind mathematisch gesehen Polynome, in deren Gleichungen die Koeffizienten materialabhängige Größen sind. In diesem Artikel werden die Komponenten des Festigkeitstensors und die sogenannten technischen Festigkeiten für die Pannonia Pappel und Zerreiche zusammengefasst. Es handelt sich dabei um Laubhölzer, die bei Neuaufforstungen im Rahmen der Umstrukturierung der ungarischen Land- und Forstwirtschaft bevorzugt zur Anpflanzung gelangen sollen.
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Altenbach, H. "Book Review: Peter Hagedorn, Technische Mechanik - Band 1, Statik." ZAMM 84, no. 10-11 (2004): 774. http://dx.doi.org/10.1002/zamm.200490030.

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Altenbach, H. "Book Review:Herbert Balke, Einführung in die Technische Mechanik - Festigkeitslehre." ZAMM 89, no. 5 (2009): 415. http://dx.doi.org/10.1002/zamm.200990008.

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Dammann, Elmar, Stefan Behrendt, Florina Ştefănică, and Reinhold Nickolaus. "Kompetenzniveaus in der ingenieurwissenschaftlichen akademischen Grundbildung – Analysen im Fach Technische Mechanik." Zeitschrift für Erziehungswissenschaft 19, no. 2 (2016): 351–74. http://dx.doi.org/10.1007/s11618-016-0675-5.

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Kurrer, Karl-Eugen. "Technische Mechanik. Statik. Von G. Holzmann, H. Meyer und G. Schumpich." Stahlbau 79, no. 3 (2010): 208. http://dx.doi.org/10.1002/stab.201090011.

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Renner, B. "Book Review: Russell C. Hibbeler, Technische Mechanik 1 – Statik, 10., überarb. Aufl." ZAMM 86, no. 6 (2006): 463. http://dx.doi.org/10.1002/zamm.200690027.

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Altenbach, H. "Book Review: Technische Mechanik für Ingenieure. By A. Kühhorn and G. Silber." ZAMM 82, no. 5 (2002): 334. http://dx.doi.org/10.1002/1521-4001(200205)82:5<334::aid-zamm334>3.0.co;2-h.

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Altenbach, H. "Book Review: Technische Mechanik der festen und flüssigen Körper. By F. Ziegler." ZAMM 82, no. 7 (2002): 496. http://dx.doi.org/10.1002/1521-4001(200207)82:7<496::aid-zamm1111496>3.0.co;2-2.

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Dissertations / Theses on the topic "Technische Mechanik"

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Naumann, Friedrich. "175 Jahre Technische Mechanik." Universitätsbibliothek Chemnitz, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-156707.

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In der 175-jährigen Geschichte der Technischen Universität Chemnitz nimmt die Technische Mechanik im Kanon der technikwissenschaftlichen Disziplinen eine exponierte Stellung ein, zählt sie doch zu jenen Grundlagenfächern, die bereits nach Gründung der Königlichen Gewerbschule im Jahre 1836 auf dem Lehrplan standen und im Fortgang der Schulentwicklung stete Ausformung und Bereicherung erfuhren. Getragen von einer Vielzahl von Lehrer- und Forscherpersönlichkeiten, die überwiegend auf langjährige praktische Erfahrungen in renommierten Betrieben und unterschiedlichen gesellschaftlichen Bereichen verweisen konnten, nahm das Fachgebiet bis zur Gegenwart eine bemerkenswerte Entwicklung. Heute stellt es einen wichtigen Eckpfeiler der Fachausbildung dar und wird nicht nur von den Studenten im Maschineningenieurwesen, sondern auch von zahlreichen tangierenden Disziplinen wahrgenommen. Erstmals wird diese historische Entwicklung aus verschiedenen Perspektiven zusammengefasst, indem sowohl die Entwicklung der Lehrinhalte als auch die Spezifik der jeweiligen Ausbildungsgegebenheiten eingehender beschrieben wird. Dabei finden Lehrende wie Lernende, aber auch Forschung und Entwicklung, wissenschaftliches Leben, internationale Zusammenarbeit und Publizistik gleichermaßen Berücksichtigung. Das Buch ist das Resultat langjähriger Forschungsarbeiten, die im Zusammenhang mit der Geschichte der Bildungseinrichtung und zu ausgewählten Themen der Wissenschaftsentwicklung unter der Obhut der Professur Wissenschafts-, Technik- und Hochschulgeschichte geleistet wurden, und als ein Beitrag zum Jubiläum »175 Jahre TU Chemnitz« zu verstehen
During the 175 years history of the Technical University of Chemnitz technical mechanics has been one of the basic disciplines of the engineering sciences. From the Higher Vocational School`s foundation in 1836 it has been part of the curriculum and has experienced continuous enrichment and refinement. As a result of excellent work of a large number of academic researchers and teachers, most of them with a background at renowned industrial companies and in diverse social areas, this scientific field experienced a remarkable development. Today it represents an important cornerstone of the curriculum and is studied not only by mechanical engineering students but also by many others from neighboring disciplines. For the first time this historical development is presented from different perspectives, dealing in depth with the evolution of the different subjects taught and also with the specifics of the conditions of academic teaching. In this context, academic teachers and students, research and development, academic life, international cooperation as well as publications are dealt with. This book is the outcome of longstanding research pursued by the Chair of the History of Science, Technology and Higher Learning on selected topics of the history of science and academic education. It is a contribution to the 175th anniversary of the Technical University of Chemnitz
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Bahlke, Herbert. "Zur Struktur der Grundgleichungen in der Technischen Mechanik." Technische Universität Dresden, 2004. https://tud.qucosa.de/id/qucosa%3A75967.

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Obwohl es lange nach NEWTON und EULER nicht mehr erwartet werden sollte, unter­scheiden sich die Grundgleichungen in der Mechanik als Bestandteil der Physik von denen der Technischen Mechanik. Es gab und gibt hierzu sogar innerhalb der Tech­nischen Mechanik unterschiedliche Auffas­sungen. Im Folgenden werden in der Literatur anzutreffende wesentliche Varian­ten von Strukturen der Grundgleichungen der Mechanik diskutiert und dabei auftreten­de Unstimmigkeiten benannt. Das Ziel der Arbeit besteht darin, einen Vorschlag für die Struktur der Grundgleichungen in der ein­führenden Lehre zur Technischen Mechanik zu formulieren, der frei von diesen Un­stimmigkeiten ist und auch weitergehenden Studien dienen kann.:Einleitung Die Struktur der Grundgleichungen in der allgemeinen Mechanik Die Struktur der statischen Grundgleichungen in der Technischen Mechanik Schlussfolgerungen für die Struktur der kinetischen Grundgleichungen in der Technischen Mechanik
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Balke, Herbert. "Zur Struktur der Grundgleichungen in der Technischen Mechanik." Technische Universität Dresden, 2004. https://tud.qucosa.de/id/qucosa%3A75967.

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Die Mechanik, eine der ältesten logischen Wissenschaften, hat in ihrer Entwicklung sowohl physika­lische als auch durch das Inge­nieurwesen geprägte Traditionen herausgebildet, die gegenwärtig in unterschiedlichen wissenschaft­lichen Auffassungen über ihre Grundlagen münden. Die Statik der Körper in der Technischen Mechanik beruht seit langem auf dem Schnittprinzip und den unab­hängigen Bilanzen von Kräften und Momenten. Die Physik gründet Statik und Kinetik auf den newtonschen Axiomen für Sys­teme von Punktmassen und ist prinzipiell nicht auf den Momentenbegriff angewiesen. Eine Mischung der unterschiedlichen Konzepte liefert Grundgleichun­gen, deren Strukturen mit forma­len Mängeln behaftet sind. Die Vermeidung dieser Mängel wird an der Einführung in die Tech­nische Mechanik demonstriert.:Einleitung Die Struktur der Grundgleichungen in der allgemeinen Mechanik Die Struktur der statischen Grundgleichungen in der Technischen Mechanik Schlussfolgerungen für die Struktur der kinetischen Grundgleichungen in der Technischen Mechanik Literatur
For a long time, the statics of free bodies in engineering mechanics has been based on the indepen­dent balances of forces and moments. In physics, statics and kinetics are founded on Newton´s axioms and, in principle, do not require the notion of moment. A mixture of the two concepts pro­vides basic equations with formal shortcomings. For an introduction in the engineering mechanics, it is demonstrated how these shortcomings are to be avoided.:Einleitung Die Struktur der Grundgleichungen in der allgemeinen Mechanik Die Struktur der statischen Grundgleichungen in der Technischen Mechanik Schlussfolgerungen für die Struktur der kinetischen Grundgleichungen in der Technischen Mechanik Literatur
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Gee, Michael. "Effiziente Lösungsstrategien in der nichtlinearen Schalenmechanik." [S.l. : s.n.], 2004. http://www.bsz-bw.de/cgi-bin/xvms.cgi?SWB11612011.

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Menzel, Andreas [Verfasser]. "Modelling and computation of geometrically nonlinear anisotropic inelasticity / Lehrstuhl für Technische Mechanik. A. Menzel." Kaiserlautern : Univ., Lehrstuhl für Techn. Mechanik, 2002. http://d-nb.info/967985978/34.

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Ackermann, Lutz [Verfasser]. "Simulation der Schalltransmission durch Wände / Institut für Angewandte Mechanik, Technische Universität Braunschweig. Von Lutz Ackermann." Braunschweig : Mechanik-Zentrum, 2002. http://d-nb.info/965185834/34.

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Baaser, Herbert [Verfasser]. "Anmerkungen zur Simulation von entfestigendem Materialverhalten / Hrsg.: Institut für Mechanik, Technische Universität Darmstadt. Von Herbert Baaser." Darmstadt : Inst. für Mechanik, 2004. http://d-nb.info/970919743/34.

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Pollmann, Nora [Verfasser], Wolfgang [Akademischer Betreuer] Bremser, and Michael [Akademischer Betreuer] Tiemann. "Phasenstrukturen in Hybridpolymeren und deren Einfluss auf Mechanik und Chemikalienbeständigkeit / Nora Pollmann. Betreuer: Wolfgang Bremser ; Michael Tiemann." Paderborn : Universitätsbibliothek, 2012. http://d-nb.info/103655290X/34.

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Ackermann, Marko. "Dynamics and energetics of walking with prostheses." [S.l. : s.n.], 2007. http://nbn-resolving.de/urn:nbn:de:bsz:93-opus-34086.

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Hampel, Sebastian [Verfasser]. "Numerische Simulation der Schallausbreitung unter Berücksichtigung meteorologischer Einflüsse / Institut für Angewandte Mechanik, Technische Universität Braunschweig ... Sebastian Hampel." Braunschweig : Mechanik-Zentrum, 2006. http://d-nb.info/98055649X/34.

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Books on the topic "Technische Mechanik"

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Kessel, Siegfried, and Dirk Fröhling. Technische Mechanik / Technical Mechanics. Vieweg+Teubner Verlag, 1998. http://dx.doi.org/10.1007/978-3-322-82998-6.

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Kessel, Siegfried, and Dirk Fröhling. Technische Mechanik - Engineering Mechanics. Vieweg+Teubner Verlag, 2012. http://dx.doi.org/10.1007/978-3-8348-2182-9.

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Mayr, Martin. Technische Mechanik. Carl Hanser Verlag GmbH & Co. KG, 2012. http://dx.doi.org/10.3139/9783446434011.

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Mayr, Martin. Technische Mechanik. Carl Hanser Verlag GmbH & Co. KG, 2008. http://dx.doi.org/10.3139/9783446418936.

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Böge, Alfred, and Wolfgang Böge. Technische Mechanik. Springer Fachmedien Wiesbaden, 2021. http://dx.doi.org/10.1007/978-3-658-34154-1.

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Göldner, Hans, and Wolfgang Pfefferkorn. Technische Mechanik. Vieweg+Teubner Verlag, 1988. http://dx.doi.org/10.1007/978-3-322-86316-4.

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Gross, Dietmar, Werner Hauger, and Walter Schnell. Technische Mechanik. Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/978-3-662-13103-9.

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Gross, Dietmar, Werner Hauger, Walter Schnell, Jörg Schröder, and Wolfgang A. Wall, eds. Technische Mechanik. Springer Berlin Heidelberg, 2006. http://dx.doi.org/10.1007/3-540-34092-0.

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Dankert, Helga, and Jürgen Dankert. Technische Mechanik. Vieweg+Teubner Verlag, 1994. http://dx.doi.org/10.1007/978-3-322-96744-2.

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Holzmann, Günther, Heinz Meyer, and Georg Schumpich. Technische Mechanik. Vieweg+Teubner Verlag, 1991. http://dx.doi.org/10.1007/978-3-322-96778-7.

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Book chapters on the topic "Technische Mechanik"

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Constantinescu-Simon, Liviu. "Technische Mechanik." In Handbuch Elektrische Energietechnik. Vieweg+Teubner Verlag, 1996. http://dx.doi.org/10.1007/978-3-322-91107-0_4.

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Wittenburg, Jens, Hans Albert Richard, Jürgen Zierep, and Karl Bühler. "Technische Mechanik." In Das Ingenieurwissen: Technische Mechanik. Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-41122-9_1.

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Constantinescu-Simon, Liviu. "Technische Mechanik." In Handbuch Elektrische Energietechnik. Vieweg+Teubner Verlag, 1997. http://dx.doi.org/10.1007/978-3-322-85061-4_4.

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Wittenburg, J., J. Zierep, and K. Bühler. "Technische Mechanik." In Hütte. Springer Berlin Heidelberg, 1991. http://dx.doi.org/10.1007/978-3-662-12030-9_5.

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Wittenburg, J., J. Zierep, and K. Bühler. "Technische Mechanik." In Die Grundlagen der Ingenieurwissenschaften. Springer Berlin Heidelberg, 2000. http://dx.doi.org/10.1007/978-3-662-06652-2_6.

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Böge, Alfred, Gert Böge, Wolfgang Böge, and Dominik Surek. "Technische Mechanik." In Handbuch Maschinenbau. Springer Fachmedien Wiesbaden, 2014. http://dx.doi.org/10.1007/978-3-658-06598-0_3.

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Berger, Joachim. "Technische Mechanik." In Technische Mechanik für Ingenieure. Vieweg+Teubner Verlag, 1991. http://dx.doi.org/10.1007/978-3-322-89864-7_2.

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Herrmann, Dietmar. "Technische Mechanik." In Angewandte Matrizenrechnung. Vieweg+Teubner Verlag, 1985. http://dx.doi.org/10.1007/978-3-322-96322-2_16.

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Steinmetz, Maria, and Heiner Dintera. "Technische Mechanik." In Deutsch im Maschinenbau. Springer Fachmedien Wiesbaden, 2021. http://dx.doi.org/10.1007/978-3-658-35983-6_3.

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Hardtke, Hans Jürgen, Barbara Hildebrandt, Elke Junkert, Siegbert Liebig, and Volker Ulbricht. "Technische Mechanik." In Grundwissen des Ingenieurs. Carl Hanser Verlag GmbH & Co. KG, 2007. http://dx.doi.org/10.3139/9783446445888.006.

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Conference papers on the topic "Technische Mechanik"

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Gawlitza, J., R. Kose, M. Roland, S. Diebels, A. Bücker, and A. Jung. "Quantifizierung biomechanischer Eigenschaften von Tracheen – Radiologie trifft technische Mechanik." In 102. Deutscher Röntgenkongress der Deutschen Röntgengesellschaft e. V. Georg Thieme Verlag KG, 2021. http://dx.doi.org/10.1055/s-0041-1723133.

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Eigner, Martin. "Digitalisierung der Engineering Prozesse durch System Lifecycle Management (SysLM)." In Entwerfen Entwickeln Erleben - EEE2021. Prof. Dr.-Ing. habil Ralph H. Stelzer, 2021. http://dx.doi.org/10.25368/2021.7.

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Dieser Beitrag erläutert die Umsetzung der Digitalisierung speziell im Anwendungsgebiet des Engineering. Dabei wird die Digitalisierung, sowohl des eigentlichen Produktes als auch der im Rahmen von Service-orientierten Geschäftsmodellen entwickelten Dienstleistung, vorgestellt. Ein weiterer wesentlicher Punkt der Digitalisierung sind die horizontale und vertikale Integration der technischen und administrativen Arbeitsprozesse entlang des Produktlebenszyklus. Bei den vertikalen Integrationen handelt es ich um die Integrationen der Autorensysteme entlang den Lebenszyklusphasen Anforderungsmanagement, Systemarchitektur, CAD in Mechanik, Elektronik, Softwareentwicklung, Simulation, Test, Prozessplanung und Digitale Fabrik. Bei der horizontalen Integration stehen die administrativen Funktionen wie Freigabe-, Änderungs- und Konfigurationsmanagement über den gesamten Produklebenszyklus und die technische Integration der in den einzelnen Produktlebenszyklus-Phasen erzeugten Informationen im Vordergrund. Hier ist vor allem die Verteilung und Orchestrierung der Funktionen zwischen SysLM, MES und PPS relevant.
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Franck, Jerome B., Wolfgang Riede та Paul Allenspacher. "Defect Dominated 1.06μm Laser Induced Damage of Anti-Reflectance Coatings Designed for Use at 1.3μm". У Optical Interference Coatings. Optica Publishing Group, 1995. http://dx.doi.org/10.1364/oic.1995.wb7.

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In this paper, we will discuss recent work that has taken place at the Laser Induced Damage Facility that is currently under development at the Institut für Technische Physik at Deutsche Forschungsanstalt für Luft- und Raumfahrt (DLR) in Stuttgart, Germany. The coatings discussed in this paper were selected for "out of band" studies to ensure that damage would proceed at fairly low levels. It is the unique nature of the damage that makes this a useful study into the mechanism of defect dominated damage. The samples were found to contain defects that were uniformly distributed through out the coating with a separation between defect sites of about 10μm. A second unique property is that the coating defect ensemble appears to be degenerate, i.e. there is a single defect type whose onset of failure takes place at a specific fluence. As higher fluence levels are attained, sets of micro-fracturing and pits form around the origional defect area that eventually coalesces into macroscopic damage. Higher fluence levels induce catastrophic coating failure on a macroscopic scale.
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Heller, Winfried. "A New Approach for Determination of Cavitation Sensitivity of Water." In ASME/JSME 2003 4th Joint Fluids Summer Engineering Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/fedsm2003-45309.

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The conditions for the appearance of cavitation, i.e. the local vaporization of fluid under static or dynamic stresses, are closely connected with the tensile strength of the fluid (Arndt, Keller (1992)). Although the dominant effect of water quality on the cavitation interception has been known for many years (Keller (1981, 1983, 1984)), it is uncommon to measure its stress resistance. A possible reason for that could be the unique stress-resistance probe of Keller (1987, 1994) (Eickmann (1992)), which by itself represents a great engineering break-through, is rather complex and expensive. It has become clear during the ASME/JASME conference in San Francisco, 1999 (Keller, Rott, Striedinger, Awad, Ludwig, Yang, Li), and the Fourth International Symposium on Cavitation in Pasadena 2001 (Keller), that internationally standardized testing conditions are required with respect to water quality (Heller (2000)). A relatively simple method of concurrently measuring tensile strength or cavitation susceptibility in cavitation channels has been developed at the Institute of Fluid Mechanics of the Technische Universita¨t Dresden during the last months. This newly developed tensile strength measuring technique is not only efficient and cheap but can also be installed in any existing cavitation channel with comparably small effort. The presented paper represents the actual developmentstate of the Dresden measuring device. Comparison measurements at the cavitatio n-channels of the Versuchsanstalt Obernach (Dr. Keller), Schiffsbau-Versuchsanstalt Potsdam (Mr. Heinke) and the Schiffsbau-Versuchsanstalt Hamburg (Mr. Friesch) are planed for the following months.
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Kolb, Michael, Denise Ahrens, Christoph Hirsch, and Thomas Sattelmayer. "A Model for Predicting the Lift-Off Height of Premixed Jets in Vitiated Cross Flow." In ASME Turbo Expo 2015: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/gt2015-42225.

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Lean premixed single-stage combustion is state of the art for low pollution combustion in heavy-duty gas turbines with gaseous fuels. The application of premixed jets in multi-stage combustion to lower nitric oxide emissions and enhance turndown ratio is a novel promising approach. At the Lehrstuhl für Thermodynamik, Technische Universität München, a large scale atmospheric combustion test rig has been set up for studying staged combustion. The understanding of lift-off behavior is crucial for determining the amount of mixing before ignition and for avoiding flames anchoring at the combustor walls. This experiment studies jet lift-off depending on jet equivalence ratio (0.58–0.82), jet preheat temperature (288–673 K), cross flow temperature (1634–1821 K) and jet momentum ratio (6–210). The differences to existing lift-off studies are the high cross flow temperature and applying a premixed jet. The lift-off height of the jet flame is determined by OH* chemiluminescence images, and subsequently, the data is used to analyze the influence of each parameter and to develop a model that predicts the lift-off height for similar staged combustion systems. A main outcome of this work is that the lift-off height in a high temperature cross flow cannot be described by one dimensionless number like Damköhler- or Karlovitz number. Furthermore, the ignition delay time scale τign also misses part of the lift-off height mechanism. The presented model uses turbulent time scales, the ignition delay and a chemical time scale based on the laminar flame speed. An analysis of the model reveals flame stabilization mechanisms and explains the importance of different time scale.
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Kuhn, Christian, Benedikt Bruns, Jan Fischer, Jörg Gattermann, and Karl-Heinz Elmer. "Development of a New Underwater Piling Noise Mitigation System: Using Hydro Sound Dampers (HSD)." In ASME 2012 31st International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/omae2012-83707.

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The aim of the recently published climate control by the German Federal Ministry for the Environment, Nature Conservation and Nuclear Safety (BMU) is a reduction of the German greenhouse gas emissions down to 20 % in 2050, compared to the generated greenhouse gas in 1990. To reach the given target a huge growth in renewable energy is necessary. One of the most potential possibilities to produce renewable energy in Germany will be the installation of offshore wind turbines. During the installation of offshore wind foundations such as monopiles, tripods, tripiles and jackets, mostly large tubular steel piles are impact driven to final penetration depth. In the process of impact driving, considerable underwater sound emissions will appear. In recent times, peak sound pressure levels above 190 dB re 1 μPa have been measured at a distance of 750 m away from the installation ground. These peak sound pressure levels, produced during the installation of any kind of driven offshore foundation, is potentially harmful to marine life, in particular to marine mammals such as harbor porpoises, harbor seals or grey seals. To protect the marine life the German Federal Maritime and Hydrographic Agency (BSH) set the maximum allowed underwater sound pressure level to 160 dB (SEL) at a distance of 750 m away from pile driving. To reach the given target by the BSH a new underwater piling noise mitigation system using so called hydro sound dampers (HSD) is presently developed at the Institute for Soil Mechanics and Foundation Engineering at the Technische Universität in Braunschweig (IGB-TUBS). After small scale tests in the so called ‘large wave channel’ in Hannover a full scale test was performed in the Baltic-Sea some weeks ago. The results of the measurements are very promising, as a reduction of 12 up to 20 dB could be generated. Besides existing noise mitigation systems one of the main advantage of the hydro sound dampers is, that the mitigation can be pre-adjusted to a predefined frequency range, as marine mammals are sensitive only for a certain sound frequency range. In this paper, the results of the small and large scale tests and some new research findings concerning the shape and the material of the hydro sound dampers will be presented.
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7

Crepeau, John. "A Brief History of the T4 Radiation Law." In ASME 2009 Heat Transfer Summer Conference collocated with the InterPACK09 and 3rd Energy Sustainability Conferences. ASMEDC, 2009. http://dx.doi.org/10.1115/ht2009-88060.

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Since the 1700s, natural philosophers understood that heat exchange between two bodies was not precisely linearly dependent on the temperature difference, and that at high temperatures the discrepancy became greater. Over the years, many models were developed with varying degrees of success. The lack of success was due to the difficulty obtaining accurate experimental data, and a lack of knowledge of the fundamental mechanisms underlying radiation heat exchange. Josef Stefan, of the University of Vienna, compiled data taken by a number of researchers who used various methods to obtain their data, and in 1879 proposed a unique relation to model the dependence of radiative heat exchange on the temperature: the T4 law. Stefan’s model was met with some skepticism and was not widely accepted by his colleagues. His former student, Ludwig Boltzmann, who by then had taken a position at the University of Graz in Austria, felt that there was some truth to the empirical model proposed by his mentor. Boltzmann proceeded to show in 1884, treating electromagnetic radiation as the working fluid in a Carnot cycle, that in fact the T4 law was correct. By the time that Boltzmann published his thermodynamic derivation of the radiation law, physicists became interested in the fundamental nature of electromagnetic radiation and its relation to energy, specifically determining the frequency distribution of blackbody radiation. Among this group of investigators was Wilhelm Wien, working at Physikalisch-Technische Reichsanstalt in Charlottenburg, Berlin. He proposed a relation stating that the wavelength at which the maximum amount of radiation was emitted occurred when the product of the wavelength and the temperature was equal to a constant. This became known as Wien’s Displacement Law, which he deduced this by imagining an expanding and contracting cavity, filled with radiation. Later, he combined his Displacement Law with the T4 law to give a blackbody spectrum which was accurate over some ranges, but diverged in the far infrared. Max Planck, at the University of Berlin, built on Wien’s model but, as Planck himself stated, “the energy of radiation is distributed in a completely irregular manner among the individual partial vibrations...” This “irregular” or discrete treatment of the radiation became the basis for quantum mechanics and a revolution in physics. This paper will present brief biographies of the four pillars of the T4 radiation law, Stefan, Boltzmann, Wien and Planck, and outline the methodologies used to obtain their results.
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Thiele, Frederik, Iñigo Fernandez Imaña, Xavier Manuel Juanpere, and Harald Pfifer. "Adaptive Control for Vibration Attenuation of a Laser Communication Terminal." In ESA 12th International Conference on Guidance Navigation and Control and 9th International Conference on Astrodynamics Tools and Techniques. ESA, 2023. http://dx.doi.org/10.5270/esa-gnc-icatt-2023-106.

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Laser Communication is the next generation of communication technology in the space industry, finding use in near earth as well as deep space application. They provide secure connections with significant higher data rates and less power consumption compared to conventional methods. Moreover, they address the ongoing problem of frequency saturation in radio communication technology. A challenge for optical systems is the high pointing requirement necessary to establish reliable communication links, which increase with higher data rates or distance. In this work a control method using estimation and adaptive algorithms is presented to attenuate vibrations as the main contributors for depointing in a standard Laser Communication Terminal (LCT) setup. Higher tracking performance compared to a baseline controller is achieved and the potential for decreasing hardware requirements, and thus enabling cost reduction, is analysed. The investigated standard LCT has a rigid telescope and focal plane assembly. A Fine Pointing Mechanism (FPM), which shows flexible behaviour, provides pointing angle adjustments, while an Acquisition and Tracking Sensor (ATS) determines the depointing measurement based on the transmitted and received signal. The entire terminal is connected to the satellite with a flexible mounting structure, which includes a Coarse Pointing Mechanism (CPM) to change the telescope's attitude. Establishing and maintaining an optical communication link requires a complex sequence and multiple LCT operational modes. After an initial acquisition and alignment phase the data transmission is conducted, which imposes the highest constraints for performance and robustness on the system. Those guarantee a continuous communication link and ensure specified data rates. Therefore, only the transmission mode is investigated within this paper. During this operational mode the CPM holds its position and can be considered quasi-static. The pointing adjustment is provided by the FPM in closed-loop operation. The system experiences several external disturbances, which can deteriorate pointing performance. They are transferred from the satellite to the terminal through the CPM. Typical sources are thermoelastic behaviour, solar array rotation and various micro-vibrations (MVs). Thereof MVs created by the reaction wheels for the satellite’s attitude control are identified as the main contributor, as their frequencies can coincide with the CPM-Modes. Hence only the impact of the reaction wheels is considered within the presented study. At any given time, multiple superimposed MVs from the reaction wheels are present within the system. They can each be modelled as a sinusoid with variable frequency and amplitude. After CPM transfer, they act on the closed-loop as an output disturbance during transmission mode. The general envelope for frequencies and amplitudes is known due to the reaction wheels specifications. However, the exact values at a specific time are considered unknown as no communication between the satellite and the LCT is assumed. The CPM orientation and thus its mode is indefinite as well. Only the FPM and ATS transfers are considered known. The required pointing performance can be provided using high bandwidth controllers and high sample rates, needing expensive hardware for their implementation. Within this work an alternative control method using estimation and adaptive algorithms is presented. It is based on the principle of destructive interference and particularly suited to attenuate sinusoidal disturbances with the potential to decrease hardware requirements compared to high bandwidth controllers. An observer is defined to provide an estimation of the disturbances imposed on the system after CPM transfer. It uses the residual disturbance measurement by the ATS as well as the ATS and FPM transfer. The synthesized control signal for the FPM is also fed back into the observer, allowing the estimation of the original disturbance despite attenuation. The observer provides an estimation of the disturbance in its entirety, however synthesizing the appropriate control input requires the specific properties, such as frequency, amplitude and phase-offset of each present sinusoid separately. A Fast Fourier Transformation (FFT) of a discrete signal section and analysis of the obtained frequency spectrum provides the current frequency of the most dominant sinusoid in the disturbance. Then a parameterized signal is created adaptively, which matches the amplitude and phase-offset of the disturbance part corresponding to the frequency provided by the FFT. The implemented gradient algorithm uses the solution of two differential equations minimizing a cost function, which represents the residual disturbance. A cascade setup of the described method is used to handle all parts of the disturbance. An intermediate signal processing step is added to prevent duplication in the frequency estimation by removing already identified signals from the further investigated estimated disturbance. In a concluding step the parameters are adjusted according to the FPM transfer and an additional phase-offset of 180° is introduced to synthesize the necessary control signal to attenuates the disturbance at FPM output. A nonlinear simulation is used to evaluate the pointing performance for a realistic scenario with multiple MVs. A Monte-Carlo study for several CPM-Modes, which also includes sensor noise and FPM transfer uncertainty, showed a significant improvement in pointing performance, especially during CPM resonance, compared to a simple high bandwidth controller provided as a baseline reference by Airbus. Moreover, preliminary investigations about the impact of different sample rates are conducted. The presented work was developed in cooperation between the Technische Universität Dresden and Airbus Defence and Space as part of the ESA-funded project No. AO/111017/21/NL/MGu entitled Adaptable Control and Estimation with Guaranteed Robust Performance (ACE).
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