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. 2021 Jun 8;21(12):3966.
doi: 10.3390/s21123966.

Experimental Investigation on a Bladed Disk with Traveling Wave Excitation

Luigi Carassale  1 , Elena Rizzetto  1
Affiliations

Experimental Investigation on a Bladed Disk with Traveling Wave Excitation

Luigi Carassale et al. Sensors (Basel). .

Abstract

Bladed disks are key components of turbomachines and their dynamic behavior is strongly conditioned by their small accidental lack of symmetry referred to as blade mistuning. The experimental identification of mistuned disks is complicated due to several reasons related both to measurement and data processing issues. This paper describes the realization of a test rig designed to investigate the behavior of mistuned disks and develop or validate data processing techniques for system identification. To simplify experiments, using the opposite than in the real situation, the disk is fixed, while the excitation is rotating. The response measured during an experiment carried out in the resonance-crossing condition is used to compare three alternative techniques to estimate the frequency-response function of the disk.

Keywords: bladed disk; system identification; traveling wave.

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Conflict of interest statement

The authors declare that the essay serves no personal or organizational interest. The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
Experimental setup: (a) conceptual schema; (b) bladed disk.
Figure 2
Figure 2
Excitation devices: (a) cross section of the magnet; (b) spring-mounted support.
Figure 3
Figure 3
Impedance of the electric circuit: (a) amplitude; (b) phase angle.
Figure 4
Figure 4
Voltage gain of the amplifiers: (a) amplitude; (b) phase angle.
Figure 5
Figure 5
FRF of the isolated blades: (a) before tuning; (b) after tuning.
Figure 6
Figure 6
FRF of the bladed disk. Modulus lower triangle; phase upper triangle; frequency range, 32–35 Hz.
Figure 7
Figure 7
Mode shapes of the disk: identified (solid line); best fitting harmonics (dashed lines).
Figure 8
Figure 8
Response of blade 0 during the resonance crossing of a traveling-wave force with HI 1.
Figure 9
Figure 9
FRF of the disk excited with a traveling wave of HI 1. Estimation by demodulation, Fourier transform, and wavelet transform for blade 0.
See this image and copyright information in PMC

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