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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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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