Modeling of friction contact and its application to the design of shroud contact

Journal Article · Wed Oct 01 04:00:00 EDT 1997 · Journal of Engineering for Gas Turbines and Power

DOI:https://doi.org/10.1115/1.2817082· OSTI ID:566227

Yang, B D; Menq, C H ^[1]

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1. Ohio State Univ., Columbus, OH (United States). Dept. of Mechanical Engineering

Designers of aircraft engines frequently employ shrouds in turbine design. In this paper, a variable normal load friction force model is proposed to investigate the influence of shroudlike contact kinematics on the forced response of frictionally constrained turbine blades. Analytical criteria are formulated to predict the transitions between stick, slip, and separation of the interface so as to assess the induced friction forces. When considering cyclic loading, the induced friction forces are combined with the variable normal load so as to determine the effective stiffness and damping of the friction joint over a cycle of motion. The harmonic balance method is then used to impose the effective stiffness and damping of the friction joint on the linear structure. The solution procedure for the nonlinear response of a two-degree-of-freedom oscillator is demonstrated. As an application, this procedure is used to study the coupling effect of two constrained forces, friction force and variable normal load, on the optimization of the shroud contact design.

• Sponsoring Organization: USDOE
• OSTI ID: 566227
• Report Number(s): CONF-960608--
• Journal Information: Journal of Engineering for Gas Turbines and Power, Journal Name: Journal of Engineering for Gas Turbines and Power Journal Issue: 4 Vol. 119; ISSN JETPEZ; ISSN 0742-4795
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
AIRCRAFT
FRICTION FACTOR
GAS TURBINE ENGINES
JOINTS
MATHEMATICAL MODELS
SLIDING FRICTION
TURBINE BLADES