Stereo-DIC Measurements of a Vibrating Bladed Disk: In-Depth Analysis of Full-Field Deformed Shapes
Vibration measurements of turbomachinery components are of utmost importance to characterize the dynamic behavior of rotating machines, thus preventing undesired operating conditions. Local techniques such as strain gauges or laser Doppler vibrometers are usually adopted to collect vibration data. H...
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| Format: | Article |
| Language: | English |
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MDPI AG
2021-06-01
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| Series: | Applied Sciences |
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| Online Access: | https://www.mdpi.com/2076-3417/11/12/5430 |
| _version_ | 1797530507113660416 |
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| author | Paolo Neri Alessandro Paoli Ciro Santus |
| author_facet | Paolo Neri Alessandro Paoli Ciro Santus |
| author_sort | Paolo Neri |
| collection | DOAJ |
| description | Vibration measurements of turbomachinery components are of utmost importance to characterize the dynamic behavior of rotating machines, thus preventing undesired operating conditions. Local techniques such as strain gauges or laser Doppler vibrometers are usually adopted to collect vibration data. However, these approaches provide single-point and generally 1D measurements. The present work proposes an optical technique, which uses two low-speed cameras, a multimedia projector, and three-dimensional digital image correlation (3D-DIC) to provide full-field measurements of a bladed disk undergoing harmonic response analysis (i.e., pure sinusoidal excitation) in the kHz range. The proposed approach exploits a downsampling strategy to overcome the limitations introduced by low-speed cameras. The developed experimental setup was used to measure the response of a bladed disk subjected to an excitation frequency above 6 kHz, providing a deep insight in the deformed shapes, in terms of amplitude and phase distributions, which could not be feasible with single-point sensors. Results demonstrated the system’s effectiveness in measuring amplitudes of few microns, also evidencing blade mistuning effects. A deeper insight into the deformed shape analysis was provided by considering the phase maps on the entire blisk geometry, and phase variation lines were observed on the blades for high excitation frequency. |
| first_indexed | 2024-03-10T10:29:57Z |
| format | Article |
| id | doaj.art-14f390d65a584bd2a09995aaf7a7f91c |
| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-10T10:29:57Z |
| publishDate | 2021-06-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj.art-14f390d65a584bd2a09995aaf7a7f91c2023-11-21T23:42:32ZengMDPI AGApplied Sciences2076-34172021-06-011112543010.3390/app11125430Stereo-DIC Measurements of a Vibrating Bladed Disk: In-Depth Analysis of Full-Field Deformed ShapesPaolo Neri0Alessandro Paoli1Ciro Santus2Department of Civil and Industrial Engineering, University of Pisa, Largo Lucio Lazzarino, 2, 56122 Pisa, ItalyDepartment of Civil and Industrial Engineering, University of Pisa, Largo Lucio Lazzarino, 2, 56122 Pisa, ItalyDepartment of Civil and Industrial Engineering, University of Pisa, Largo Lucio Lazzarino, 2, 56122 Pisa, ItalyVibration measurements of turbomachinery components are of utmost importance to characterize the dynamic behavior of rotating machines, thus preventing undesired operating conditions. Local techniques such as strain gauges or laser Doppler vibrometers are usually adopted to collect vibration data. However, these approaches provide single-point and generally 1D measurements. The present work proposes an optical technique, which uses two low-speed cameras, a multimedia projector, and three-dimensional digital image correlation (3D-DIC) to provide full-field measurements of a bladed disk undergoing harmonic response analysis (i.e., pure sinusoidal excitation) in the kHz range. The proposed approach exploits a downsampling strategy to overcome the limitations introduced by low-speed cameras. The developed experimental setup was used to measure the response of a bladed disk subjected to an excitation frequency above 6 kHz, providing a deep insight in the deformed shapes, in terms of amplitude and phase distributions, which could not be feasible with single-point sensors. Results demonstrated the system’s effectiveness in measuring amplitudes of few microns, also evidencing blade mistuning effects. A deeper insight into the deformed shape analysis was provided by considering the phase maps on the entire blisk geometry, and phase variation lines were observed on the blades for high excitation frequency.https://www.mdpi.com/2076-3417/11/12/5430bladed disk vibrationdigital image correlationlow-speed camerasdownsamplingmistuning |
| spellingShingle | Paolo Neri Alessandro Paoli Ciro Santus Stereo-DIC Measurements of a Vibrating Bladed Disk: In-Depth Analysis of Full-Field Deformed Shapes Applied Sciences bladed disk vibration digital image correlation low-speed cameras downsampling mistuning |
| title | Stereo-DIC Measurements of a Vibrating Bladed Disk: In-Depth Analysis of Full-Field Deformed Shapes |
| title_full | Stereo-DIC Measurements of a Vibrating Bladed Disk: In-Depth Analysis of Full-Field Deformed Shapes |
| title_fullStr | Stereo-DIC Measurements of a Vibrating Bladed Disk: In-Depth Analysis of Full-Field Deformed Shapes |
| title_full_unstemmed | Stereo-DIC Measurements of a Vibrating Bladed Disk: In-Depth Analysis of Full-Field Deformed Shapes |
| title_short | Stereo-DIC Measurements of a Vibrating Bladed Disk: In-Depth Analysis of Full-Field Deformed Shapes |
| title_sort | stereo dic measurements of a vibrating bladed disk in depth analysis of full field deformed shapes |
| topic | bladed disk vibration digital image correlation low-speed cameras downsampling mistuning |
| url | https://www.mdpi.com/2076-3417/11/12/5430 |
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