Next Generation Traveling Wave Excitation System for Integrally Bladed Rotors

Next Generation Traveling-Wave Excitation System for Integrally Bladed Rotors

Journal of Aerospace Engineering ◽

10.1061/(asce)as.1943-5525.0000493 ◽

2015 ◽

Vol 28 (6) ◽

pp. 04015005 ◽

Cited By ~ 1

Author(s):

Joseph A. Beck ◽

John A. Justice ◽

Onome E. Scott-Emuakpor ◽

Tommy J. George ◽

Jeffrey M. Brown

Keyword(s):

Traveling Wave ◽

Wave Excitation ◽

Next Generation ◽

Excitation System

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Traveling Wave Excitation: A Method to Produce Consistent Experimental Results

Journal of Engineering for Gas Turbines and Power ◽

10.1115/1.4027744 ◽

2014 ◽

Vol 136 (12) ◽

Cited By ~ 3

Author(s):

Geofrey S. Cox ◽

Anthony N. Palazotto ◽

Jeffrey M. Brown ◽

Tommy J. George

Keyword(s):

Traveling Wave ◽

Forced Response ◽

Test Stand ◽

Experimental Results ◽

Wave Excitation ◽

Alignment Position ◽

Excitation System ◽

Response Measurement ◽

Signal Input

This paper describes the experimental framework to establish consistent, repeatable results associated with a traveling wave excitation system. The experiment is employed to ascertain the forced response and mistuning patterns for rotors. Several items attributing to existing experimental inconsistencies were identified and their effects were realized during this research. These experimental items were signal input locations, response measurement locations, and rotor alignment position. Accounting for these experimental variables, this paper develops a process which enables consistent rotor forced response results, independent of its orientation on the test stand.

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A Traveling Wave Excitation System for Bladed Disks

43rd AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference ◽

10.2514/6.2002-1531 ◽

2002 ◽

Cited By ~ 4

Author(s):

Keith Jones ◽

Charles Cross

Keyword(s):

Traveling Wave ◽

Wave Excitation ◽

Excitation System ◽

Bladed Disks

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Traveling Wave Excitation System for Bladed Disks

Journal of Propulsion and Power ◽

10.2514/2.6089 ◽

2003 ◽

Vol 19 (1) ◽

pp. 135-141 ◽

Cited By ~ 25

Author(s):

Keith W. Jones ◽

Charles J. Cross

Keyword(s):

Traveling Wave ◽

Wave Excitation ◽

Excitation System ◽

Bladed Disks

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Generalized Linford formula and its application to Traveling Wave Excitation

Journal de Physique IV (Proceedings) ◽

10.1051/jp4:2001253 ◽

2001 ◽

Vol 11 (PR2) ◽

pp. Pr2-285-Pr2-288

Author(s):

R. Tommasini ◽

E. E. Fill

Keyword(s):

Traveling Wave ◽

Wave Excitation

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Experimental Investigation on a Bladed Disk with Traveling Wave Excitation

Sensors ◽

10.3390/s21123966 ◽

2021 ◽

Vol 21 (12) ◽

pp. 3966

Author(s):

Luigi Carassale ◽

Elena Rizzetto

Keyword(s):

Data Processing ◽

Traveling Wave ◽

Frequency Response Function ◽

Wave Excitation ◽

Test Rig ◽

Real Situation ◽

Bladed Disk ◽

Experimental Identification ◽

Alternative Techniques ◽

Processing Techniques

Bladed disks are key components of turbomachines and their dynamic behavior is strongly conditioned by their small accidental lack of symmetry referred to as blade mistuning. The experimental identification of mistuned disks is complicated due to several reasons related both to measurement and data processing issues. This paper describes the realization of a test rig designed to investigate the behavior of mistuned disks and develop or validate data processing techniques for system identification. To simplify experiments, using the opposite than in the real situation, the disk is fixed, while the excitation is rotating. The response measured during an experiment carried out in the resonance-crossing condition is used to compare three alternative techniques to estimate the frequency-response function of the disk.

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On the Response of Modulated Doublet Modes to Traveling Wave Excitation

10.1115/imece2000-2002 ◽

2000 ◽

Author(s):

J. Y. Chang ◽

J. A. Wickert

Keyword(s):

Periodic Structure ◽

Traveling Wave ◽

Illustrative Case ◽

Wave Excitation ◽

State Response ◽

The Individual ◽

Limiting Case ◽

Backward Propagation ◽

Fourier Harmonics ◽

Split Frequency

Abstract The forced vibration of arotationally periodic structure when subjected to traveling wave excitation is discussed, with emphasis placed on the steady-state response of doublet modes having either repeated or split frequencies. Such vibration modes have spatially modulated shapes defined by (i) the numbers of nodal diameters present in the limiting case of axisymmetry, and (ii) certain additional, superposed, contaminating Fourier harmonics which distort their appearances. The natural frequency and mode structure of a model periodic structure is discussed in the context of an otherwise axisymmetric disk having evenly-spaced, sector-shaped, line distributions of stiffness and inertia. Through a perturbation analysis, the contamination wavenumbers present in a doublet having repeated frequency are shown to comprise two subsets, the members of which have sine and cosine coefficients of the same, or of differing, signs for each wavenumber present in the mode shape’s Fourier expansion. That structure for the wavenumber content is explored further with respect to the response of repeated and split doublets to a harmonic traveling wave excitation. The individual Fourier components comprising a modulated doublet mode shape can propagate in the same direction as the excitation, or opposite to it, depending on the wavenumber of the excitation and the subset to which the contamination wavenumber belongs. The response of the split frequency doublets and the circumstances under which traveling or standing wave responses, or a blend of the two, can occur in the structure’s reference frame are examined and discussed in the context of the model periodic structure. The qualitative character of the response, the forward or backward propagation direction of each mode’s constituent wavenumber components, and the phase speeds of those components are discussed in illustrative case studies.

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