Journal ArticleDOI
Modeling of Friction Contact and Its Application to the Design of Shroud Contact
B. D. Yang,Chia-Hsiang Menq +1 more
TLDR
In this paper, a variable normal load friction force model is proposed to investigate the influence of shroud-like contact kinematics on the forced response of frictionally constrained turbine blades, and analytical criteria are formulated to predict the transitions between stick, slip, and separation of the interface so as to assess the induced friction forces.Abstract:
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 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.read more
Citations
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Journal ArticleDOI
Effects of Damping and Varying Contact Area at Blade-Disk Joints in Forced Response Analysis of Bladed Disk Assemblies
Evgeny Petrov,David J. Ewins +1 more
TL;DR: In this article, an approach is developed to analyze the multiharmonic forced response of large-scale finite element models of bladed disks taking account of the nonlinear forces acting at the contact interfaces of blade roots.
Journal ArticleDOI
Qualitative analysis of forced response of blisks with friction ring dampers
TL;DR: In this article, a damping strategy for blisks (integrally bladed disks) of turbomachinery involving a friction ring is investigated, where the friction force is calculated in the time domain.
Journal ArticleDOI
Multiharmonic Forced Response Analysis of a Turbine Blading Coupled by Nonlinear Contact Forces
TL;DR: In this paper, a three-dimensional structural dynamics model including an appropriate spatial contact model is used to predict the contact forces generated by the shroud contacts and to describe the vibrational behavior of the blading with sufficient accuracy.
Journal ArticleDOI
Characterization of Contact Kinematics and Application to the Design of Wedge Dampers in Turbomachinery Blading: Part 1—Stick-Slip Contact Kinematics
B. D. Yang,Chia-Hsiang Menq +1 more
TL;DR: In this article, a dual-interface friction force model is proposed to investigate the coupling contact kinematics of a self-centering, blade-to-blade damper, which can provide more design flexibility to meet various needs in different operating conditions when compared with conventional platform dampers.
Journal ArticleDOI
Characterization of Contact Kinematics and Application to the Design of Wedge Dampers in Turbomachinery Blading: Part 2—Prediction of Forced Response and Experimental Verification
B. D. Yang,Chia-Hsiang Menq +1 more
TL;DR: In this paper, a dual-interface friction force model was proposed for the prediction of the forced response of a blade constrained by wedge dampers, which can be used to optimize a given damper design, namely to determine the dynamic weight at which the maximum reduction of resonant response is obtained.
References
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Book
Introduction to Numerical Continuation Methods
Eugene L. Allgower,Kurt Georg +1 more
TL;DR: The Numerical Continuation Methods for Nonlinear Systems of Equations (NCME) as discussed by the authors is an excellent introduction to numerical continuuation methods for solving nonlinear systems of equations.
Journal ArticleDOI
Nonlocal and Nonlinear Friction Laws and Variational Principles for Contact Problems in Elasticity
J. T. Oden,E. B. Pires +1 more
TL;DR: In this article, nonclassical friction laws are proposed in an attempt to overcome both physical and mathematical difficulties; the former arises from the fact that this law provides a poor model of frictional stresses at points on metallic surfaces in contact, and the latter is due to the existence of solutions of the governing equations can be proved only for very special situations.
Journal ArticleDOI
The influence of microslip on vibratory response, part I: A new microslip model
TL;DR: In this paper, a physically motivated, continuous microslip model of friction is developed for analyzing the dynamic response of frictionally damped structures in which the friction interface is subjected to high normal loads.
Related Papers (5)
Analytical Formulation of Friction Interface Elements for Analysis of Nonlinear Multi-Harmonic Vibrations of Bladed Disks
Evgeny Petrov,David J. Ewins +1 more