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TECHNICAL PAPERS

Acoustic Fatigue of Impellers of Rotating Machinery

[+] Author and Article Information
Frantisek L. Eisinger

Foster Wheeler Energy Corporation, Clinton, NJ 08809-4000e-mail: frank_eisinger@fwc.com

J. Pressure Vessel Technol 124(2), 154-160 (May 01, 2002) (7 pages) doi:10.1115/1.1462622 History: Received August 24, 2001; Revised November 02, 2001; Online May 01, 2002
Copyright © 2002 by ASME
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References

Bull, M. K., and Norton, M. P., 1982, “On Coincidence in Relation to Prediction of Pipe Wall Vibration and Noise Radiation Due to Turbulent Pipe Flow Disturbed by Pipe Fittings,” Int. Conference on Flow Induced Vibration in Fluid Engineering, Reading, England, BHRA Fluid Engineering, pp. 347–368.
Norton, M. P., 1989, Fundamentals of Noise and Vibration Analysis for Engineers, Cambridge University Press, Cambridge, U.K.
Fahy, F. J., 1998, Sound and Structural Vibration, Academic Press, London, New York.
Eisinger,  F. L., 1997, “Designing Piping Systems Against Acoustically Induced Structural Fatigue,” ASME J. Pressure Vessel Technol., 119, pp. 379–383.
Eisinger,  F. L., and Francis,  J. T., 1999, “Acoustically Induced Structural Fatigue of Piping Systems,” ASME J. Pressure Vessel Technol., 121, pp. 438–443.
Fahy,  F. J., 1969, “Vibration of Containing Structures by Sound in the Contained Fluid,” J. Sound Vib., 10, No. 3, pp. 490–512.
Fahy,  F. J., 1970, “Response of a Cylinder to Random Sound in the Contained Fluid,” J. Sound Vib., 13, No. 2, pp. 171–194.
Dowell,  E. H., Gorman,  G. F. , and Smith,  D. A., 1977, “Acoustocelasticity: General Theory, Acoustic Natural Modes and forced Response to Sinusoidal Excitation, Including Comparisons with Experiment,” J. Sound Vib., 52, No. 4, pp. 519–542.
Eckert, L, 1999, “High Cycle Fatigue Cracks at Radial Fan Impellers Caused by Aerolastic Self-Excited Impeller Vibrations, Part I: Case History, Root Cause Analysis, Vibration Measurements,” Proc. ASME Design Engineering Conference, Las Vegas, NV, Paper DET C99/VIB-8261.
Ni, A., 1999, “High Cycle Fatigue Cracks at Radial Fan Impellers Caused by Aeroelastic Self-Excited Impeller Vibrations, Part 2: Mechanism and Mathematical Model,” Proc. ASME Design Engineering Conference, Las Vegas, NV, Paper DEI C99/VIB-8262.
Gorman, D. G., Horacek, J., and Dedouch, K., 1999, “Vibro-Acoustic Characteristics of a Disc Interacting with Fluid in a Cylindrical Cavity,” Proc., 3rd Int. Conference, Engineering Aero-Hydroelasticity, Institute of Thermomechanics, Academy of Science of Czech Republic, Prague.
Eisinger, F. L., 1998, personal communications.
Den Hartog, J. P., 1956, Mechanical Vibrations, McGraw-Hill Book Company, New York, NY.

Figures

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Acoustic modes inside a cylindrical shell or structural modes of a circular disk—mode orders: p,q (acoustic), m,n (structural)
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Coincidence conditions between structural and acoustic modes schematically—(a) diametral modes, (b) mixed diametral/circumferential modes
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Examples of wave number coincidence between structural and acoustic waves
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Two degrees of freedom spring mass oscillator system representing structural-acoustic interaction
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Example of local alteration of casing of a centrifugal fan to affect harmful acoustic modes
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Sample problem showing wave number coincidences in second diametral modes for a centrifugal fan—(a) for ωsa, complete coincidence with coupling, vibration and acoustic fatigue predicted; (b) for ωs sufficiently separated from ωa (a minimum of 25 percent), vibration not predicted
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Sample problem showing frequency coincidence but no wave number coincidence—(a) no coupling, condition acceptable; (b) with presence of single frequency (blade passing frequency) pulsation ωBPas, forced vibration at resonance, condition not acceptable

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