Details
| Original language | English |
|---|---|
| Article number | 111414 |
| Number of pages | 21 |
| Journal | Mechanical Systems and Signal Processing |
| Volume | 216 |
| Early online date | 14 May 2024 |
| Publication status | E-pub ahead of print - 14 May 2024 |
Abstract
Operational modal analysis is used to identify modal parameters of a rotating machine, more specifically an axial compressor. The application of operational modal analysis to rotating machines is considered a challenge, since the rotation disturbs the output measured and can be falsely identified as structural characteristics. Thus, an effective approach to handle the rotor speed harmonics consisting of a modified technique for harmonic removal and a criterion for the identification of harmonics is presented. Additionally, the axial compressor investigated in this work is characterized by numerous joints introducing friction. Thus, localized nonlinear structural behavior needs to be taken into account, when determining the sought-after modal parameters. In order to deal with the friction influence leading to varying eigenfrequencies and damping ratios with increasing response amplitudes, an operating point dependent modal parameter identification process is proposed. The damping values, which are identified in operation, decrease by up to one order of magnitude from the modal damping in standstill condition. These results demonstrate the relevance of an operating point dependent analysis of the structural behavior of rotating machines.
Keywords
- Axial compressor, Operational modal analysis, Rotation synchronous vibrations, Structural health monitoring, Viscous & friction damping
ASJC Scopus subject areas
- Engineering(all)
- Control and Systems Engineering
- Computer Science(all)
- Signal Processing
- Engineering(all)
- Civil and Structural Engineering
- Engineering(all)
- Aerospace Engineering
- Engineering(all)
- Mechanical Engineering
- Computer Science(all)
- Computer Science Applications
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In: Mechanical Systems and Signal Processing, Vol. 216, 111414, 01.07.2024.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Modal parameter estimation of turbomachinery in operation taking into account friction damping
AU - Amer, Mona
AU - Ventura, Carlos E.
AU - Maroldt, Niklas
AU - Seume, Joerg R.
AU - Wallaschek, Joerg
N1 - Publisher Copyright: © 2024 The Authors
PY - 2024/5/14
Y1 - 2024/5/14
N2 - Operational modal analysis is used to identify modal parameters of a rotating machine, more specifically an axial compressor. The application of operational modal analysis to rotating machines is considered a challenge, since the rotation disturbs the output measured and can be falsely identified as structural characteristics. Thus, an effective approach to handle the rotor speed harmonics consisting of a modified technique for harmonic removal and a criterion for the identification of harmonics is presented. Additionally, the axial compressor investigated in this work is characterized by numerous joints introducing friction. Thus, localized nonlinear structural behavior needs to be taken into account, when determining the sought-after modal parameters. In order to deal with the friction influence leading to varying eigenfrequencies and damping ratios with increasing response amplitudes, an operating point dependent modal parameter identification process is proposed. The damping values, which are identified in operation, decrease by up to one order of magnitude from the modal damping in standstill condition. These results demonstrate the relevance of an operating point dependent analysis of the structural behavior of rotating machines.
AB - Operational modal analysis is used to identify modal parameters of a rotating machine, more specifically an axial compressor. The application of operational modal analysis to rotating machines is considered a challenge, since the rotation disturbs the output measured and can be falsely identified as structural characteristics. Thus, an effective approach to handle the rotor speed harmonics consisting of a modified technique for harmonic removal and a criterion for the identification of harmonics is presented. Additionally, the axial compressor investigated in this work is characterized by numerous joints introducing friction. Thus, localized nonlinear structural behavior needs to be taken into account, when determining the sought-after modal parameters. In order to deal with the friction influence leading to varying eigenfrequencies and damping ratios with increasing response amplitudes, an operating point dependent modal parameter identification process is proposed. The damping values, which are identified in operation, decrease by up to one order of magnitude from the modal damping in standstill condition. These results demonstrate the relevance of an operating point dependent analysis of the structural behavior of rotating machines.
KW - Axial compressor
KW - Operational modal analysis
KW - Rotation synchronous vibrations
KW - Structural health monitoring
KW - Viscous & friction damping
UR - http://www.scopus.com/inward/record.url?scp=85193902702&partnerID=8YFLogxK
U2 - 10.1016/j.ymssp.2024.111414
DO - 10.1016/j.ymssp.2024.111414
M3 - Article
AN - SCOPUS:85193902702
VL - 216
JO - Mechanical Systems and Signal Processing
JF - Mechanical Systems and Signal Processing
SN - 0888-3270
M1 - 111414
ER -