Measuring the Performance of Underplatform Dampers for Turbine Blades by Rotating Laser Doppler Vibrometer

Abstract Underplatform friction dampers are commonly used to control the vibration level of turbine blades in order to prevent high-cycle fatigue failures. Experimental validation of highly non-linear response predictions obtained from FEM bladed disk models incorporating underplatform dampers models has proved to be very difficult so as the assessment of the performance of a chosen design. In this paper, the effect of wedge-shaped underplatform dampers on the dynamics of a simple bladed disk under rotating conditions is measured and the effect of the excitation level on the UPDs performances is investigated at different number of the engine order excitation nearby resonance frequencies of the 1st blade bending modes of the system. The measurements are performed with an improved configuration of a rotating test rig, designed with a non-contact magnetic excitation and a non-contact rotating SLDV measurement system.

[1]  Dario Di Maio,et al.  Applications of continuous tracking SLDV measurement methods to axially symmetric rotating structures using different excitation methods , 2010 .

[2]  Teresa Maria Berruti,et al.  A Test Rig for Non-Contact Travelling Wave Excitation of a Bladed Disk With Underplatform Dampers , 2010 .

[3]  Walter Sextro,et al.  Spatial Dynamics of Tuned and Mistuned Bladed Disks with Cylindrical and Wedge-Shaped Friction Dampers , 2003 .

[4]  Teresa Maria Berruti,et al.  A Test Rig for Noncontact Traveling Wave Excitation of a Bladed Disk With Underplatform Dampers , 2011 .

[5]  Stefano Zucca,et al.  The effect of underplatform dampers on the forced response of bladed disks by a coupled static/dynamic harmonic balance method , 2011 .

[6]  Chia-Hsiang Menq,et al.  Characterization of Contact Kinematics and Application to the Design of Wedge Dampers in Turbomachinery Blading: Part 2—Prediction of Forced Response and Experimental Verification , 1998 .

[7]  Chia-Hsiang Menq,et al.  Characterization of Contact Kinematics and Application to the Design of Wedge Dampers in Turbomachinery Blading: Part 1—Stick-Slip Contact Kinematics , 1998 .

[8]  D. J. Ewins,et al.  Advanced Modeling of Underplatform Friction Dampers for Analysis of Bladed Disk Vibration , 2007 .

[9]  David J. Ewins,et al.  Underplatform Dampers for Turbine Blades: Theoretical Modeling, Analysis, and Comparison With Experimental Data , 2001 .

[10]  Ibrahim A. Sever.  Experimental validation of turbomachinery blade vibration predictions , 2004 .

[11]  Christian Maria Firrone,et al.  Measurement of the kinematics of two underplatform dampers with different geometry and comparison with numerical simulation , 2009 .

[12]  J. Szwedowicz,et al.  Numerical and Experimental Damping Assessment of a Thin-Walled Friction Damper in the Rotating Setup With High Pressure Turbine Blades , 2006 .

[13]  Stefano Zucca,et al.  Underplatform dampers for turbine blades: The effect of damper static balance on the blade dynamics , 2009 .

[14]  David J. Ewins,et al.  Underplatform Dampers for Turbine Blades: Theoretical Modelling, Analysis and Comparison With Experimental Data , 1999 .

[15]  D. J. Ewins,et al.  Experimental and Numerical Investigation of Rotating Bladed Disk Forced Response Using Underplatform Friction Dampers , 2008 .

[16]  Ning An,et al.  Forced Response Prediction of Constrained and Unconstrained Structures Coupled Through Frictional Contacts , 2009 .

[17]  Evgeny Petrov,et al.  Explicit Finite Element Models of Friction Dampers in Forced Response Analysis of Bladed Disks , 2008 .

[18]  Christian Maria Firrone,et al.  Modeling a friction damper: analysis of the experimental data and comparison with numerical results , 2006 .