1. bookVolume 51 (2021): Issue 2 (June 2021)
Journal Details
License
Format
Journal
First Published
26 Feb 2008
Publication timeframe
4 times per year
Languages
English
access type Open Access

Diagnostics of Turbine Blades, Based on Estimation of Frequency Response Function

Published Online: 17 Jul 2021
Page range: 63 - 78
Journal Details
License
Format
Journal
First Published
26 Feb 2008
Publication timeframe
4 times per year
Languages
English
Abstract

The aim of the study is to propose a diagnostics method based on blade’s vibration model in frequency domain. Amplitude spectrum A(ω) and phase spectrum φ(ω) have been experimentally identified which define transfer function G(jω) = P(ω) + jQ(ω) and their real P(ω) and imaginary Q(ω) parts. Transfer function G(jω) and resulting frequency, amplitude, phase characteristics and real P(ω) and imaginary Q(ω) parts are parts of blade’s diagnostics model. Changes in those characteristics are directly related to changes in the technical condition of the blades. It has been noticed that small changes in the technical condition cause large changes in frequency characteristics, which proves their usefulness in the diagnosis process.

Keywords

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