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Sensors 2014, 14(7), 11919-11942; doi:10.3390/s140711919

Feasibility of Using PZT Actuators to Study the Dynamic Behavior of a Rotating Disk due to Rotor-Stator Interaction

1,* , 1
1 Centre de Diagnòstic Industrial I Fluidodinàmica, Universitat Politècnica de Catalunya, Av. Diagonal, 647. ETSEIB. Pab. D+1. 08028 Barcelona, Spain 2 Voith Hydro Holding GmbH & Co. KG, Alexanderstrasse 11, 89522 Heidenheim, Germany
* Author to whom correspondence should be addressed.
Received: 22 May 2014 / Revised: 2 July 2014 / Accepted: 2 July 2014 / Published: 7 July 2014
(This article belongs to the Section Physical Sensors)
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In this paper, PZT actuators are used to study the dynamic behavior of a rotating disk structure due to rotor-stator interaction excitation. The disk is studied with two different surrounding fluids—air and water. The study has been performed analytically and validated experimentally. For the theoretical analysis, the natural frequencies and the associated mode shapes of the rotating disk in air and water are obtained with the Kirchhoff-Love thin plate theory coupled with the interaction with the surrounding fluid. A model for the Rotor Stator Interaction that occurs in many rotating disk-like parts of turbomachinery such as compressors, hydraulic runners or alternators is presented. The dynamic behavior of the rotating disk due to this excitation is deduced. For the experimental analysis a test rig has been developed. It consists of a stainless steel disk (r = 198 mm and h = 8 mm) connected to a variable speed motor. Excitation and response are measured from the rotating system. For the rotating excitation four piezoelectric patches have been used. Calibrating the piezoelectric patches in amplitude and phase, different rotating excitation patterns are applied on the rotating disk in air and in water. Results show the feasibility of using PZT to control the response of the disk due to a rotor-stator interaction.
Keywords: rotating disk; PZT actuator; RSI; rotating excitation; resonance rotating disk; PZT actuator; RSI; rotating excitation; resonance
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Presas, A.; Egusquiza, E.; Valero, C.; Valentin, D.; Seidel, U. Feasibility of Using PZT Actuators to Study the Dynamic Behavior of a Rotating Disk due to Rotor-Stator Interaction. Sensors 2014, 14, 11919-11942.

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