Publication detail
Measuring Device for More Precise Mistuning Identification of Integrated Bladed Discs
KUČERA, O. PÍŠTĚK, V. FOMIN, O. KUČERA, P. SAGIN, S.
Original Title
Measuring Device for More Precise Mistuning Identification of Integrated Bladed Discs
Type
journal article in Web of Science
Language
English
Original Abstract
In integrated turbine wheel designs, small deviations, known as mistuning, often occur in the modal properties of individual blades due to manufacturing tolerances and material inhomogeneity. During operation, this mistuning can cause some rotor blades to be subjected to significantly higher loads than predicted for an ideal rotor. The degree of rotor mistuning can only be determined using methods of experimental modal analysis. However, the manual use of the modal hammer cannot ensure precise repeatability of the force impulse’s location and timing, leading to inaccuracies. This article introduces a mechanism that replaces manual modal hammer operations, guaranteeing consistent impact location and timing while eliminating double strikes. The device was verified on bladed discs of various sizes, and its usability is demonstrated in this article on a turbine wheel of a marine engine turbocharger. The developed mechanism automates modal hammer strikes, ensuring precisely repeatable force courses and positioning for each impact. This automation reduces the measurement time and significantly improves the accuracy. The results of this research showed that even with careful manual operation of the modal hammer by an experienced operator, statistically significant differences arise in the repeated measurements of a bladed disc mistuning, whereas with the use of the presented measuring device, the results of the repeated measurements are practically identical.
Keywords
bladed disc; mistuning; measuring device; turbocharger; marine engine
Authors
KUČERA, O.; PÍŠTĚK, V.; FOMIN, O.; KUČERA, P.; SAGIN, S.
Released
7. 5. 2025
Publisher
MDPI
ISBN
2073-8994
Periodical
Symmetry
Year of study
17
Number
5
State
Swiss Confederation
Pages from
1
Pages to
15
Pages count
15
URL
Full text in the Digital Library
BibTex
@article{BUT197883,
author="Ondřej {Kučera} and Václav {Píštěk} and Oleksij {Fomin} and Pavel {Kučera} and Sergii {Sagin}",
title="Measuring Device for More Precise Mistuning Identification of Integrated Bladed Discs",
journal="Symmetry",
year="2025",
volume="17",
number="5",
pages="1--15",
doi="10.3390/sym17050717",
issn="2073-8994",
url="https://www.mdpi.com/2073-8994/17/5/717"
}