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Aktives Folienlager Mit Nachgiebigem Lagerträger Und Piezokeramischen Patchaktuatoren by Hannes Schmiedeke

Aktives Folienlager Mit Nachgiebigem Lagerträger Und Piezokeramischen Patchaktuatoren

by Hannes Schmiedeke
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Book cover type: Hardcover
  • ISBN13: 9783662700945
  • Binding: Hardcover
  • Subject: N/A
  • Publisher: Springer Vieweg
  • Publisher Imprint: Springer Vieweg
  • Publication Date:
  • Pages: 172
  • Original Price: EUR 121.486
  • Language: German
  • Edition: 2024
  • Item Weight: 450 grams
  • BISAC Subject(s): Machinery

Folienlager sind Gleitlager mit einer nachgiebigen Innenkontur. Dies erlaubt die Kompensation der fliehkraft- und temperaturbedingten Wellenexpansion bei hohen Drehzahlen. Die vielen Reibkontakte zwischen den Folien erhöhen zudem die Lagerdämpfung. Mit aerodynamisch wirkenden Folienlagern ausgestattete Turbomaschinen können somit je nach Baugrö e mit mehr als 100.000 U/min betrieben werden. Ein wesentlicher Faktor, der die Lebensdauer begrenzt, ist der Verschlei bei jedem Start-Stop-Zyklus. Unglücklicherweise können Folienlager geometrisch entweder auf einen geringeren Verschlei beim Anfahren oder eine grö ere Stabilität bei hohen Drehzahlen optimiert werden. In dem hier vorliegenden Buch wird daher der Ansatz eines aktiv schaltbaren Folienlagers vorgestellt, bei welchem das Lagerspiel und die geometrische Vorspannung (Preload) je nach Betriebszustand eingestellt werden können. Anhand theoretischer Überlegungen und experimenteller Beobachtungen zeigt sich eine grundsätzliche Eignung der im aktiven Lager angestrebten Schaltformen. So ist trotz signifikanter Einflüsse von Fertigungs- und Montageabweichungen eine Verbesserung des Anfahrverhaltens bzw. ein stabiler Betrieb bei hohen Drehzahlen sichtbar. Die Integration der aktiven Komponente, bestehend aus den piezokeramischen Patchaktuatoren und einem geometrisch an eine dreiflächige Lagerbuchse angelehnten Lagerträger, verändern das Betriebsverhalten gegenüber der passiven Prototypen dabei aber erheblich. So verringert sich neben der Lagersteifigkeit auch die Lagerdämpfung. Zudem genügen moderate Lasten und fertigungsbedingte Eigenspannungen, um die aktive Verformung des Lagerträgers zu blockieren. Theoretische Modelle zeigen, dass eine Versteifung der aktiven Komponente durchaus zielführend ist. Eine praktische Umsetzung ist hingegen aufgrund fehlender Aktuatorwerkstoffe aktuell noch nicht möglich.

Jan. 2018 - Feb. 2024: wissenschaftlicher Mitarbeiter am Institut für Mechanik und Adaptronik der TU Braunschweig (ehemals Institut für Adaptronik und Funktionsintegration), Schwerpunkte: Experimenteller Nachweis eines aktiv schaltbaren Folienlagers, Aufbau von Prüfständen für Folienlager, Entwurf und Fertigung von Folienlagern Okt. 2014 - Jan. 2017: Master "Allgemeiner Maschinenbau / Produktentwicklung" in Magdeburg (Otto-von-Guericke Universität) Okt. 2011 - Nov. 2014: Bachelor "Allgemeiner Maschinenbau" in Magdeburg (Otto-von-Guericke Universität) Veröffentlichungen: Jun. 2022: Experimental Investigation of Two Switching States of an Active Foil Bearing during Start-Up, MDPI Machines Jan. 2021: Experimental Investigation of the Leaf Type Bearing Structure with Undersprings Under Dynamic Excitation, MDPI Machines

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