This paper presents a static test rig called “Octopus” designed for the validation of numerical models aimed at calculating the nonlinear dynamic response of a bladed disk with underplatform dampers (UPDs). The test rig supports a bladed disk on a fixture and each UPD is pressed against the blade platforms by wires pulled by dead weights. Both excitation system and response measurement system are noncontacting. This paper features the design and the setup of the noncontacting excitation generated by electromagnets placed under each blade. A traveling wave excitation is generated according to a desired engine order by shifting the phase of the harmonic force of one electromagnet with respect to the contiguous exciters. Since the friction phenomenon generated by UPDs introduces nonlinearities on the forced response, the amplitude of the exciting force must be kept constant at a known value on every blade during step-sine test to calculate frequency response functions. The issue of the force control is therefore addressed since the performance of the electromagnet changes with frequency. The system calibration procedure and the estimated errors on the generated force are also presented. Examples of experimental tests that can be performed on a dummy integral bladed disk (blisk) mounted on the rig are described in the end.
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e-mail: teresa.berruti@polito.it
e-mail: christian.firrone@polito.it
e-mail: muzio.gola@polito.it
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March 2011
Research Papers
A Test Rig for Noncontact Traveling Wave Excitation of a Bladed Disk With Underplatform Dampers
Teresa Berruti,
Teresa Berruti
Department of Mechanical Engineering,
e-mail: teresa.berruti@polito.it
Politecnico di Torino
, Corso Duca degli Abruzzi, 24 10129 Turin, Italy
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Christian M. Firrone,
Christian M. Firrone
Department of Mechanical Engineering,
e-mail: christian.firrone@polito.it
Politecnico di Torino
, Corso Duca degli Abruzzi, 24 10129 Turin, Italy
Search for other works by this author on:
Muzio M. Gola
Muzio M. Gola
Department of Mechanical Engineering,
e-mail: muzio.gola@polito.it
Politecnico di Torino
, Corso Duca degli Abruzzi, 24 10129 Turin, Italy
Search for other works by this author on:
Teresa Berruti
Department of Mechanical Engineering,
Politecnico di Torino
, Corso Duca degli Abruzzi, 24 10129 Turin, Italye-mail: teresa.berruti@polito.it
Christian M. Firrone
Department of Mechanical Engineering,
Politecnico di Torino
, Corso Duca degli Abruzzi, 24 10129 Turin, Italye-mail: christian.firrone@polito.it
Muzio M. Gola
Department of Mechanical Engineering,
Politecnico di Torino
, Corso Duca degli Abruzzi, 24 10129 Turin, Italye-mail: muzio.gola@polito.it
J. Eng. Gas Turbines Power. Mar 2011, 133(3): 032502 (8 pages)
Published Online: November 11, 2010
Article history
Received:
May 11, 2010
Revised:
June 3, 2010
Online:
November 11, 2010
Published:
November 11, 2010
Citation
Berruti, T., Firrone, C. M., and Gola, M. M. (November 11, 2010). "A Test Rig for Noncontact Traveling Wave Excitation of a Bladed Disk With Underplatform Dampers." ASME. J. Eng. Gas Turbines Power. March 2011; 133(3): 032502. https://doi.org/10.1115/1.4002100
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