Title: Features of vibration-based damage detection in stepped shafts of steam turbines

Authors: Anatoliy P. Bovsunovsky

Addresses: Department of Mechanical Engineering, Standardization and Certification of Equipment, National University of Food Technologies, Kiev, 01601, Kyiv-33, 68 Volodymyrska St., 03033 – Kiev, Ukraine

Abstract: The vibration-based damage detection has practically no alternative as applied to the rotating shafts of steam turbines during operation. However, taking into account the heavy operating conditions of turbines and the complex shape of turbines shaft, the choice of most effective method of vibration diagnostics is not an easy problem. To solve this problem, a relatively simple method of comparative evaluation of the effectiveness of vibration diagnostics of damage as applied to the stepped rotors and shafting of steam turbine was developed. The method is based on the determination of relative change of shaft's compliance caused by a crack with the use of linear fracture mechanics. As an example there was performed the comparative analysis of efficiency of vibration diagnostics, namely the change of natural bending, longitudinal or torsional frequency of vibration and the nonlinear effects, to detect transverse or longitudinal crack in rotors and shafting of steam turbine K-215-130.

Keywords: vibration diagnostics; natural frequency; nonlinear effects; crack; steam turbine; stepped shaft.

DOI: 10.1504/IJLCPE.2018.094861

International Journal of Lifecycle Performance Engineering, 2018 Vol.2 No.3/4, pp.144 - 161

Received: 18 Aug 2017
Accepted: 05 Feb 2018

Published online: 25 Sep 2018 *

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