タービンブレード厚み推定方法

Turbine blade thickness estimating method

Abstract

【課題】蒸気タービンにおいて侵食を受けるタービンブレードの厚みを推定するタービンブレード厚み推定方法を提供すること。 【解決手段】流体中を流れる粒子がブレードに衝突することにより生じるAE信号を測定すると共に、AE信号の強度及び粒径の相関により粒子の粒径を求める。AE信号の周波数スペクトルにおける低周波域A1,B1成分の積分値S1及び高周波域A2,B2成分の積分値S2の比であるスペクトル比Rを求める。そして、粒子粒径、厚み及びスペクトル比の相関により厚みを推定する。低周波域成分の積分値S1が100kHz以上400kHz以内の全てA1又は一部B1の周波数域から選ばれる積分値であり、高周波域成分の積分値S2が450kHz以上600kHz以内の全てA2又は一部B2の周波数域から選ばれる積分値であることが望ましい。 【選択図】 図5
<P>PROBLEM TO BE SOLVED: To provide a turbine blade thickness estimating method for estimating a thickness of a turbine blade of a steam turbine to be eroded. <P>SOLUTION: While measuring an AE signal occurring by collision of particles flowing in liquid with a blade, particle diameter of a particle is obtained from a correlation between strength of the AE signal and a particle diameter. A spectral ratio R is acquired which is a ratio between an integration value S1 of components of low frequency ranges A1, B1 in a frequency spectrum of the AE signal and an integration value S2 of components of high frequency ranges A2, B2. The thickness is estimated from the correlation of the particle diameter of a particle, the thickness and the spectral ratio. The integration value S1 of the low frequency range component is an integration value preferably chosen from the whole A1 or a part B1 of the frequency range between 100 kHz and 400 kHz. The integration value S2 of the high frequency range component is an integration value preferably chosen from the whole A2 or a part B2 of the frequency range between 450 kHz and 600 kHz. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Claims

Description

Topics

Download Full PDF Version (Non-Commercial Use)

Patent Citations (0)

    Publication numberPublication dateAssigneeTitle

NO-Patent Citations (0)

    Title

Cited By (0)

    Publication numberPublication dateAssigneeTitle