Characterization of laws of friction in the context of engine blade dynamics

Journal Article · Thu Oct 01 04:00:00 EDT 1998 · Journal of Engineering for Gas Turbines and Power

DOI:https://doi.org/10.1115/1.2818464· OSTI ID:316147

Srinivasan, A V ^[1]; McFarland, D M ^[2]

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1. Worcester Polytechnic Inst., MA (United States). Dept. of Mechanical Engineering
2. Univ. of Connecticut, Storrs, CT (United States). Dept. of Mechanical Engineering

Experience has shown that energy dissipation due to rubbing at interfaces of engine blade shrouds provides damping of bladed disk assemblies. An accurate estimate of such damping has been a subject of study for more than a decade. The most difficult parameter that influences its accurate calculation pertains to an appropriate definition of the laws of friction that relate the rubbing motion with the forces induced. This paper develops an analysis that leads to a mathematical relationship between the forces of friction damping at a vibrating interface and the corresponding relative motion. The analysis permits calculation of forces at the interface if the displacements are known or vice versa. The equations are cast in terms of relative motion between mating shrouds so that degenerate cases of fully locked and freely slipping can be calculated. Examples are given showing simulation results obtained using discrete structural models. Extension of the analysis to the case of a full assembly is discussed.

• Sponsoring Organization: USDOE
• OSTI ID: 316147
• Journal Information: Journal of Engineering for Gas Turbines and Power, Journal Name: Journal of Engineering for Gas Turbines and Power Journal Issue: 4 Vol. 120; ISSN JETPEZ; ISSN 0742-4795
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
DAMPING
FRICTION
MECHANICAL VIBRATIONS
TURBINE BLADES