Experimental measurements of the natural frequencies and mode shapes of rotating disk-blades-disk assemblies from the stationary frame
| Autor: | Mònica Egusquiza, Alexandre Presas, Eduard Egusquiza, David Valentin, Carme Valero |
|---|---|
| Přispěvatelé: | Universitat Politècnica de Catalunya. Departament de Mecànica de Fluids, Universitat Politècnica de Catalunya. Doctorat en Enginyeria Mecànica, Fluids i Aeronàutica, Universitat Politècnica de Catalunya. FLUIDS - Enginyeria de Fluids, Universitat Politècnica de Catalunya. CDIF - Centre de Diagnòstic Industrial i Fluidodinàmica |
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Modal analysis
02 engineering and technology lcsh:Technology 01 natural sciences 010305 fluids & plasmas law.invention lcsh:Chemistry Physics::Fluid Dynamics 0203 mechanical engineering Centrifugal pumps law Normal mode Mode-shapes Turbomachinery General Materials Science natural frequencies lcsh:QH301-705.5 Instrumentation Fluid Flow and Transfer Processes Physics Rotor (electric) General Engineering lcsh:QC1-999 modal analysis Computer Science Applications Bombes centrífugues 020303 mechanical engineering & transports centrifugal pumps pump-turbine Laser Doppler vibrometer Reference frame Acoustics Pump-turbine Natural frequencies Enginyeria mecànica [Àrees temàtiques de la UPC] 0103 physical sciences closed impellers Computer simulation lcsh:T Process Chemistry and Technology Centrifugal pump mode-shapes lcsh:Biology (General) lcsh:QD1-999 lcsh:TA1-2040 lcsh:Engineering (General). Civil engineering (General) Closed impellers lcsh:Physics Enginyeria mecànica::Mecànica de fluids [Àrees temàtiques de la UPC] |
| Zdroj: | Recercat. Dipósit de la Recerca de Catalunya instname UPCommons. Portal del coneixement obert de la UPC Universitat Politècnica de Catalunya (UPC) Applied Sciences Volume 9 Issue 18 Applied Sciences, Vol 9, Iss 18, p 3864 (2019) |
| Popis: | Determining the natural frequencies and mode shapes of rotating turbomachinery components from both rotating and stationary reference frames is of paramount importance to avoid resonance problems that could affect the normal operation of the machine, or even cause critical damages in these components. Due to their similarity to real engineering cases, this topic has been experimentally analyzed in the past for disk-shaft assemblies and rotor disk-blades assemblies (bladed-disk or blisk). The same topic is less analyzed for disk-blades-disk assemblies, although such configurations are widely used in centrifugal closed impellers of compressors, hydraulic pumps, pump-turbines, and runners of high head Francis turbines. In this paper, experimental measurements, varying the rotating speed of a disk-blade-disk assembly and exciting the first natural frequencies of the rotating frame, have been performed. The rotating structure is excited and measured by means of PZT patches from the rotating frame and with a Laser Doppler Vibrometer (LDV). In order to interpret the experimental results obtained from the stationary frame, a method to decompose the diametrical mode shapes of the structure in simple diametrical components (which define the diametrical mode shapes of a simple disk) has been proposed. It is concluded that the resonant frequencies detected with a stationary sensor correspond to the ones predicted with the decomposition method. Finally, a means to obtain equivalent results with numerical simulation methods is shown. |
| Databáze: | OpenAIRE |
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