Identification of Mistuning and Model Updating of an Academic Blisk Based on Geometry and Vibration Measurements

Abstract In this work, an experimental modal analysis is performed on an academic bladed disk using a base excitation to identify the mistuning of each blade. Optical measurement is used to obtain the exact geometry of the structure and to be able to associate geometric mistuning to each blade. Differences are observed between the experimentally identified mistuning and the geometric mistuning. Since the bladed disk is a one-piece structure, there are no welded connections between the blades and the disk and the material properties can be assumed to be uniform. It can be shown that these differences come from non uniform clamping conditions, and that this mistuning is of the same order of magnitude than the variations in the geometry of the structure. It follows that the precise characterization of mistuning for industrial structures is in practice illusory because of the numerous factors introducing mistuning, such as the clamping conditions, aerodynamic damping, wear in service, etc.

[1]  Jean-Claude Golinval,et al.  Experimental Modal Identification of Mistuning in an Academic Blisk and Comparison With the Blades Geometry Variations , 2015 .

[2]  Christophe Pierre,et al.  Reduced Order Modeling and Vibration Analysis of Mistuned Bladed Disk Assemblies With Shrouds , 1998 .

[3]  Marc P. Mignolet,et al.  Identification of Structural Parameters in Mistuned Bladed Disks , 1997 .

[4]  Christophe Pierre,et al.  System Identification of Multistage Turbine Engine Rotors , 2007 .

[5]  J. H. Griffin,et al.  A Fundamental Model of Mistuning for a Single Family of Modes , 2002 .

[6]  Matthew P. Castanier,et al.  Reduced-Order Model Construction Procedure for Robust Mistuning Identification of Blisks , 2008 .

[7]  Christophe Pierre,et al.  Reduced Order Modeling and Vibration Analysis of Mistuned Bladed Disk Assemblies With Shrouds , 1998 .

[8]  J. H. Griffin,et al.  Mistuning Identification of Bladed Disks Using a Fundamental Mistuning Model-Part I: Theory (2003-GT-38952) , 2004 .

[9]  Christophe Pierre,et al.  Experimental mistuning identification in bladed disks using a component-mode-based reduced-order model , 2009 .

[10]  Denis Laxalde,et al.  Mistuning Identification and Model Updating of an Industrial Blisk , 2007 .

[11]  Christophe Pierre,et al.  A reduced-order modeling technique for mistuned bladed disks , 1994 .

[12]  Matthew P. Castanier,et al.  Modeling and Analysis of Mistuned Bladed Disk Vibration: Status and Emerging Directions , 2006 .

[13]  Christophe Pierre,et al.  Modelling and analysis of multi-stage systems of mistuned bladed disks , 2011 .

[14]  Marc P. Mignolet,et al.  Identification of Mistuning Characteristics of Bladed Disks From Free Response Data— Part II , 1998 .

[15]  Jerry H. Griffin,et al.  A Reduced-Order Model of Mistuning Using a Subset of Nominal System Modes , 2001 .

[16]  Christophe Pierre,et al.  Forced response of mistuned bladed disks using reduced-order modeling , 1996 .

[17]  J. H. Griffin,et al.  Mistuning Identification of Bladed Disks Using a Fundamental Mistuning Model-Part II: Application (2003-GT-38953) , 2004 .

[18]  Christophe Pierre,et al.  Component-Mode-Based Reduced Order Modeling Techniques for Mistuned Bladed Disks: Part II — Application , 2000 .

[19]  Louis Jezequel,et al.  Mistuning Parameters Identification of a Bladed Disk , 2001 .

[20]  Christophe Pierre,et al.  Vibration Modeling of Bladed Disks Subject to Geometric Mistuning and Design Changes , 2004 .

[21]  Christophe Pierre,et al.  Compact, Generalized Component Mode Mistuning Representation for Modeling Bladed Disk Vibration , 2003 .

[22]  Fabrice Thouverez,et al.  Mistuning identification for industrial blisks based on the best achievable eigenvector , 2006 .

[23]  Jerry H. Griffin,et al.  A Normalized Modal Eigenvalue Approach for Resolving Modal Interaction , 1996 .

[24]  Christophe Pierre,et al.  Component-Mode-Based Reduced Order Modeling Techniques for Mistuned Bladed Disks—Part I: Theoretical Models , 2001 .

[25]  P. Guillaume,et al.  The PolyMAX Frequency-Domain Method: A New Standard for Modal Parameter Estimation? , 2004 .

[26]  Marc P. Mignolet,et al.  Identification of Mistuning Characteristics of Bladed Disks From Free Response Data — Part II , 1998 .