A feasibility study has been carried out to clarify if and how a set of simple rubber rings can be used as passive damping devices for aero engine rotors. Rubber rings made of elastomer material are in use for rotordynamic damping for a long time. Those rubber rings are relatively cheap and simple to apply. In the past, rings were designed for sealing but not for damping applications. Based on the necessary damping for the rotor, the identification of the feasible ring material and design was a result of a 'trial and error' study. A direct path, i.e. a design rule, was not available. In addition, the rubber ring dampers could be optimised for one resonance frequency only. This was acceptable for steady state conditions of turbo pumps or electrical motors. In recent years a detailed study at the TU Berlin has been carried out that yielded to a design rule for elastomer rings for rotordynamic damping. It was the aim of the feasibility study making use of the previously derived knowledge on elastomer rings. It should be shown that those elastomer rings could be used in aero engines in terms of technical application, material, chemical and heat resistance and cost reduction. This report shows that elastomer rings are capable to supply sufficient damping for engine rotors during normal operation. A design rule for aero engine application has been derived. Recent rubber materials show more capability to withstand aggressive fluids and high temperatures.
Vibration damping of aero engine rotors by elastomer ring bearings
Schwingungsdämpfung von Flugtriebwerklaufrädern durch Elastomer-Ringlager
2006
11 Seiten, 13 Bilder, 2 Tabellen, 9 Quellen
Conference paper
English
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