Fatigue cracks from high cycle vibratory loading have developed in a centrifugal fan impeller after a relatively short period of operation. Based on vibration tests of the impeller and acoustic analysis of the internal spaces of the fan, structural-acoustic coupling with matching frequencies involving two-nodal diameter modes (structural and acoustic) was identified as the cause of the vibration problem. This paper gives a description of the problem and identifies available remedies for its elimination. Special attention is given in Case 1 to the acoustics of the system, where changes to the fan casing utilizing a decoupling acoustic chamber attached to the casing was investigated, and in Case 2, where changes needed to the structural characteristics of the impeller by utilizing a modified impeller with a substantially increased natural frequency (by 44%) of the two-nodal diameter vibratory mode shape were studied. Experimental tests confirmed that the structural-acoustic coupling and vibration were significantly reduced in Case 1 and were fully eliminated in Case 2.
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November 2007
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Vibration Fatigue of Centrifugal Fan Impeller Due to Structural-Acoustic Coupling and Its Prevention: A Case Study
Frantisek L. Eisinger,
Frantisek L. Eisinger
Fellow ASME
Foster Wheeler North America, Inc.
, Perryville Corporate Park, Clinton, NJ 08809
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Robert E. Sullivan
Robert E. Sullivan
Mem. ASME
Foster Wheeler North America, Inc.
, Perryville Corporate Park, Clinton, NJ 08809
Search for other works by this author on:
Frantisek L. Eisinger
Fellow ASME
Foster Wheeler North America, Inc.
, Perryville Corporate Park, Clinton, NJ 08809
Robert E. Sullivan
Mem. ASME
Foster Wheeler North America, Inc.
, Perryville Corporate Park, Clinton, NJ 08809J. Pressure Vessel Technol. Nov 2007, 129(4): 771-774 (4 pages)
Published Online: October 25, 2006
Article history
Received:
April 20, 2006
Revised:
October 25, 2006
Citation
Eisinger, F. L., and Sullivan, R. E. (October 25, 2006). "Vibration Fatigue of Centrifugal Fan Impeller Due to Structural-Acoustic Coupling and Its Prevention: A Case Study." ASME. J. Pressure Vessel Technol. November 2007; 129(4): 771–774. https://doi.org/10.1115/1.2767371
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