Determining the dynamic response of submerged and confined disklike structures is of interest in engineering applications, such as in hydraulic turbine runners. This dynamic response is heavily affected by the added mass and damping as well as the proximity of solid boundaries. These solid boundaries are normally considered as completely rigid in theoretical or numerical calculations, however, this assumption is not always valid. Some hydraulic turbines have noncompletely stiff casings, which can modify the dynamic response of the runner itself, affecting specially its natural frequencies and damping behavior. To determine the influence of noncompletely rigid nearby surfaces in the dynamic behavior of a submerged structure, an experimental test rig has been constructed. This test rig is based on a disk attached to a shaft and confined in a tank covered with two different casings with different mass and stiffness. For both covers and different disk to cover distances, natural frequencies and damping ratios of the disk have been obtained experimentally. Accelerometers installed on the disk and covers as well as pressure sensors are used for this purpose. Results obtained for all the cases are discussed in detail and compared with a simplified theoretical model.
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April 2017
Research-Article
Experimental Study of a Vibrating Disk Submerged in a Fluid-Filled Tank and Confined With a Nonrigid Cover
David Valentín,
David Valentín
Centre for Industrial Diagnostics and
Fluid Dynamics (CDIF),
Polytechnic University of Catalonia (UPC),
Avinguda Diagonal, 647 ETSEIB,
Barcelona 08028, Spain
e-mail: david.valentin@mf.upc.edu
Fluid Dynamics (CDIF),
Polytechnic University of Catalonia (UPC),
Avinguda Diagonal, 647 ETSEIB,
Barcelona 08028, Spain
e-mail: david.valentin@mf.upc.edu
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Alexandre Presas,
Alexandre Presas
Centre for Industrial Diagnostics and
Fluid Dynamics (CDIF),
Polytechnic University of Catalonia (UPC),
Avinguda Diagonal, 647 ETSEIB,
Barcelona 08028, Spain
e-mail: alex.presas@mf.upc.edu
Fluid Dynamics (CDIF),
Polytechnic University of Catalonia (UPC),
Avinguda Diagonal, 647 ETSEIB,
Barcelona 08028, Spain
e-mail: alex.presas@mf.upc.edu
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Eduard Egusquiza,
Eduard Egusquiza
Centre for Industrial Diagnostics and
Fluid Dynamics (CDIF),
Polytechnic University of Catalonia (UPC),
Avinguda Diagonal, 647 ETSEIB,
Barcelona 08028, Spain
e-mail: egusquiza@mf.upc.edu
Fluid Dynamics (CDIF),
Polytechnic University of Catalonia (UPC),
Avinguda Diagonal, 647 ETSEIB,
Barcelona 08028, Spain
e-mail: egusquiza@mf.upc.edu
Search for other works by this author on:
Carme Valero,
Carme Valero
Centre for Industrial Diagnostics and
Fluid Dynamics (CDIF),
Polytechnic University of Catalonia (UPC),
Avinguda Diagonal, 647 ETSEIB,
Barcelona 08028, Spain
e-mail: valero@mf.upc.edu
Fluid Dynamics (CDIF),
Polytechnic University of Catalonia (UPC),
Avinguda Diagonal, 647 ETSEIB,
Barcelona 08028, Spain
e-mail: valero@mf.upc.edu
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Mònica Egusquiza
Mònica Egusquiza
Centre for Industrial Diagnostics and
Fluid Dynamics (CDIF),
Polytechnic University of Catalonia (UPC),
Avinguda Diagonal, 647 ETSEIB,
Barcelona 08028, Spain
e-mail: monica.egusquiza@upc.edu
Fluid Dynamics (CDIF),
Polytechnic University of Catalonia (UPC),
Avinguda Diagonal, 647 ETSEIB,
Barcelona 08028, Spain
e-mail: monica.egusquiza@upc.edu
Search for other works by this author on:
David Valentín
Centre for Industrial Diagnostics and
Fluid Dynamics (CDIF),
Polytechnic University of Catalonia (UPC),
Avinguda Diagonal, 647 ETSEIB,
Barcelona 08028, Spain
e-mail: david.valentin@mf.upc.edu
Fluid Dynamics (CDIF),
Polytechnic University of Catalonia (UPC),
Avinguda Diagonal, 647 ETSEIB,
Barcelona 08028, Spain
e-mail: david.valentin@mf.upc.edu
Alexandre Presas
Centre for Industrial Diagnostics and
Fluid Dynamics (CDIF),
Polytechnic University of Catalonia (UPC),
Avinguda Diagonal, 647 ETSEIB,
Barcelona 08028, Spain
e-mail: alex.presas@mf.upc.edu
Fluid Dynamics (CDIF),
Polytechnic University of Catalonia (UPC),
Avinguda Diagonal, 647 ETSEIB,
Barcelona 08028, Spain
e-mail: alex.presas@mf.upc.edu
Eduard Egusquiza
Centre for Industrial Diagnostics and
Fluid Dynamics (CDIF),
Polytechnic University of Catalonia (UPC),
Avinguda Diagonal, 647 ETSEIB,
Barcelona 08028, Spain
e-mail: egusquiza@mf.upc.edu
Fluid Dynamics (CDIF),
Polytechnic University of Catalonia (UPC),
Avinguda Diagonal, 647 ETSEIB,
Barcelona 08028, Spain
e-mail: egusquiza@mf.upc.edu
Carme Valero
Centre for Industrial Diagnostics and
Fluid Dynamics (CDIF),
Polytechnic University of Catalonia (UPC),
Avinguda Diagonal, 647 ETSEIB,
Barcelona 08028, Spain
e-mail: valero@mf.upc.edu
Fluid Dynamics (CDIF),
Polytechnic University of Catalonia (UPC),
Avinguda Diagonal, 647 ETSEIB,
Barcelona 08028, Spain
e-mail: valero@mf.upc.edu
Mònica Egusquiza
Centre for Industrial Diagnostics and
Fluid Dynamics (CDIF),
Polytechnic University of Catalonia (UPC),
Avinguda Diagonal, 647 ETSEIB,
Barcelona 08028, Spain
e-mail: monica.egusquiza@upc.edu
Fluid Dynamics (CDIF),
Polytechnic University of Catalonia (UPC),
Avinguda Diagonal, 647 ETSEIB,
Barcelona 08028, Spain
e-mail: monica.egusquiza@upc.edu
1Corresponding author.
Contributed by the Technical Committee on Vibration and Sound of ASME for publication in the JOURNAL OF VIBRATION AND ACOUSTICS. Manuscript received July 25, 2016; final manuscript received September 27, 2016; published online February 3, 2017. Assoc. Editor: Marco Amabili.
J. Vib. Acoust. Apr 2017, 139(2): 021005 (11 pages)
Published Online: February 3, 2017
Article history
Received:
July 25, 2016
Revised:
September 27, 2016
Citation
Valentín, D., Presas, A., Egusquiza, E., Valero, C., and Egusquiza, M. (February 3, 2017). "Experimental Study of a Vibrating Disk Submerged in a Fluid-Filled Tank and Confined With a Nonrigid Cover." ASME. J. Vib. Acoust. April 2017; 139(2): 021005. https://doi.org/10.1115/1.4035105
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