Details
| Original language | English |
|---|---|
| Title of host publication | Structures and Dynamics |
| Subtitle of host publication | Structural Mechanics, Vibration, and Damping; Supercritical CO2 |
| Publisher | American Society of Mechanical Engineers(ASME) |
| ISBN (electronic) | 9780791884232 |
| Publication status | Published - 11 Jan 2021 |
| Event | ASME Turbo Expo 2020: Turbomachinery Technical Conference and Exposition, GT 2020 - online, Virtual, Online Duration: 21 Sept 2020 → 25 Sept 2020 |
Publication series
| Name | Proceedings of the ASME Turbo Expo |
|---|---|
| Volume | 11 |
Abstract
Validating simulation results of vibrating turbine blades relies on measurements of realistic or academic cyclic structures on special test rigs. In real operation the blades are excited mainly by aerodynamic forces. For measurements of blade vibration on special test rigs, the excitation should be well known. It is desirable to use excitation spectra that consist of only a few engine order excitations. Especially for nonlinear systems, unwanted excitation orders can possibly lead to nonlinear effects which may interfere with the measurement. To separate different engine orders, an innovative electromagnetic excitation device was developed at the institution to overcome the aforementioned problems. The excitation force spectrum is controlled by a variable air gap over the circumference between device and blade. Any desired engine order excitation can be realized. Additionally, by varying the devices coil current in a harmonic fashion, frequency sweeps at constant speed can be performed. In this paper an extensive study of the excitation force spectrum of the device is conducted. Therefore, theoretical investigations of the expectable spectrum are given under simultaneous variation of air gap geometry and excitation current. These predictions are then validated by experiments featuring a small, academic bladed disk. The vibrations of the blades are measured. The device promises to create well predictable and controllable excitation force spectra which will improve the validation strategy in particular of non-linear simulation tools for the prediction of turbine blade vibrations.
ASJC Scopus subject areas
- Engineering(all)
- General Engineering
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Structures and Dynamics: Structural Mechanics, Vibration, and Damping; Supercritical CO2. American Society of Mechanical Engineers(ASME), 2021. (Proceedings of the ASME Turbo Expo; Vol. 11).
Research output: Chapter in book/report/conference proceeding › Conference contribution › Research › peer review
}
TY - GEN
T1 - Single nodal diameter excitation of turbine blades
T2 - ASME Turbo Expo 2020: Turbomachinery Technical Conference and Exposition, GT 2020
AU - Hoffmann, Thomas
AU - Panning-von Scheidt, Lars
AU - Wallaschek, Jörg
N1 - Funding Information: tion of the German Federal Parliament under grant number 03424292D. The derotator measurements were supported by the German Research Foundation (DFG) by funding their subproject ”Regeneration induced Mistuning” as part of the Collaborative Research Center (CRC) 871 “Regeneration of Complex Capital Goods”. The authors gratefully acknowledge Siemens AG for their support and permission to publish this paper. The responsibility for the content lies solely with its authors.
PY - 2021/1/11
Y1 - 2021/1/11
N2 - Validating simulation results of vibrating turbine blades relies on measurements of realistic or academic cyclic structures on special test rigs. In real operation the blades are excited mainly by aerodynamic forces. For measurements of blade vibration on special test rigs, the excitation should be well known. It is desirable to use excitation spectra that consist of only a few engine order excitations. Especially for nonlinear systems, unwanted excitation orders can possibly lead to nonlinear effects which may interfere with the measurement. To separate different engine orders, an innovative electromagnetic excitation device was developed at the institution to overcome the aforementioned problems. The excitation force spectrum is controlled by a variable air gap over the circumference between device and blade. Any desired engine order excitation can be realized. Additionally, by varying the devices coil current in a harmonic fashion, frequency sweeps at constant speed can be performed. In this paper an extensive study of the excitation force spectrum of the device is conducted. Therefore, theoretical investigations of the expectable spectrum are given under simultaneous variation of air gap geometry and excitation current. These predictions are then validated by experiments featuring a small, academic bladed disk. The vibrations of the blades are measured. The device promises to create well predictable and controllable excitation force spectra which will improve the validation strategy in particular of non-linear simulation tools for the prediction of turbine blade vibrations.
AB - Validating simulation results of vibrating turbine blades relies on measurements of realistic or academic cyclic structures on special test rigs. In real operation the blades are excited mainly by aerodynamic forces. For measurements of blade vibration on special test rigs, the excitation should be well known. It is desirable to use excitation spectra that consist of only a few engine order excitations. Especially for nonlinear systems, unwanted excitation orders can possibly lead to nonlinear effects which may interfere with the measurement. To separate different engine orders, an innovative electromagnetic excitation device was developed at the institution to overcome the aforementioned problems. The excitation force spectrum is controlled by a variable air gap over the circumference between device and blade. Any desired engine order excitation can be realized. Additionally, by varying the devices coil current in a harmonic fashion, frequency sweeps at constant speed can be performed. In this paper an extensive study of the excitation force spectrum of the device is conducted. Therefore, theoretical investigations of the expectable spectrum are given under simultaneous variation of air gap geometry and excitation current. These predictions are then validated by experiments featuring a small, academic bladed disk. The vibrations of the blades are measured. The device promises to create well predictable and controllable excitation force spectra which will improve the validation strategy in particular of non-linear simulation tools for the prediction of turbine blade vibrations.
UR - http://www.scopus.com/inward/record.url?scp=85099777002&partnerID=8YFLogxK
U2 - 10.1115/GT2020-14282
DO - 10.1115/GT2020-14282
M3 - Conference contribution
AN - SCOPUS:85099777002
T3 - Proceedings of the ASME Turbo Expo
BT - Structures and Dynamics
PB - American Society of Mechanical Engineers(ASME)
Y2 - 21 September 2020 through 25 September 2020
ER -