Method and system for turbine blade characterization

Details Method and system for turbine blade characterization Method and system for turbine blade characterization

G - Physics

01

M

G01M 13/00 (2006.01) F01D 5/12 (2006.01)

Patent

CA 2686702

Methods and systems providing for characterizing turbine blades, including characterizing the dynamics of one or more turbine blades or stages of a stage in terms of natural frequencies, normalized response intensity, and/or stage modal shape or nodal configuration. Such methods and systems comprise fluid (e.g., oil) excitation of bladed disks and quantitative modeling of the fluid excitation. Additionally or alternatively, such methods and systems may provide for analyzing modal shape or nodal configuration of a bladed disk (e.g., a turbine stage) based on a phase analysis of strain signals acquired from a bladed disk subjected to a fluid excitation, wherein the modal shape or nodal configuration corresponds to modes of blades coupled through a disc or shrouding.

La présente invention concerne des procédés et des systèmes permettant de caractériser des aubes de turbine, comprenant la caractérisation de la dynamique d'une ou de plusieurs aubes ou d'un ou de plusieurs étages de turbine d'un étage en termes de fréquences naturelles, intensité de réponse normalisée et/ou forme modale ou configuration nodale d'étage. De tels procédés et systèmes comprennent l'excitation par un fluide (par ex., de l'huile) des disques à aubes et la modélisation quantitative de l'excitation par un fluide. En outre ou en variante, de tels procédés et systèmes peuvent fournir une analyse de la forme modale ou de la configuration nodale d'un disque à aubes (par ex., un étage de turbine) sur la base d'une analyse de phase de signaux de contrainte obtenus à partir d'un disque à aubes soumis à une excitation par fluide, la forme modale ou la configuration nodale correspondant à des modes d'aubes couplées par l'intermédiaire d'un disque ou bandage.

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