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Aktives Folienlager Mit Nachgiebigem Lagerträger Und Piezokeramischen Patchaktuatoren

Aktives Folienlager Mit Nachgiebigem Lagerträger Und Piezokeramischen Patchaktuatoren

          
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About the Book

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 Baugröße mit mehr als 100.000 U/min betrieben werden. Ein wesentlicher Faktor, der die Lebensdauer begrenzt, ist der Verschleiß bei jedem Start-Stop-Zyklus. Unglücklicherweise können Folienlager geometrisch entweder auf einen geringeren Verschleiß beim Anfahren oder eine größere 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.


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Product Details
  • ISBN-13: 9783662700945
  • Publisher: Springer
  • Publisher Imprint: Springer Vieweg
  • Language: German
  • Returnable: Y
  • ISBN-10: 3662700948
  • Publisher Date: 24 Jan 2025
  • Binding: Hardback
  • No of Pages: 194


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Aktives Folienlager Mit Nachgiebigem Lagerträger Und Piezokeramischen Patchaktuatoren
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