Stiffness and energy dissipative capacity in squeeze film dampers - An experimental study

Kumar, VA and Michael, Antony (1995) Stiffness and energy dissipative capacity in squeeze film dampers - An experimental study. In: 12th ISABE - International Symposium on Air Breathing Engines, 10-15 Sept 1995, Melbourne, Australia.

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Abstract

Squeeze film dampers as a device for providing external damping in high speed machinery in general and aircraft gas turbines in particular have become an inevitable integral part of such rotating machines. The effective performance of such external damping devices depends on the behavior of support coefficients and the capacity for dissipating the unwanted energy generated from residual unbalance near or while crossing over the critical speeds. In this paper, the details of the experimental evaluation of the static stiffness of typical cantilevered type of damper rings through static loading and dynamic excitation technique, and some aspects regarding the study of the effects of a few important dimensionless geometric and operating parameters related to squeeze film dampers on dimensionless energy dissipative capacity of such damping devices are discussed. It is also observed that the ring behaves more like one with a fixed-constrained end condition rather than a fixed-free one. The energy dissipative capacity of the squeeze film damper can be enhanced by increasing the dimensionless load which can easily be altered by monitoring the external oil supply pressure which also incidentally controls the damper to operate in a 'no cavitation zone', thus implying that an increase in dimensionless load would result in higher damping compared to the increase in bearing plane stiffness.

Item Type: Conference or Workshop Item (Paper)
Uncontrolled Keywords: Aircraft gas turbines;Dynamic excitation technique
Subjects: ENGINEERING > Mechanical Engineering
Division/Department: Propulsion Division, Propulsion Division
Depositing User: M/S ICAST NAL
Date Deposited: 22 Sep 2006
Last Modified: 24 May 2010 09:50
URI: http://nal-ir.nal.res.in/id/eprint/2774

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