DYNAMIC ANALYSIS OF AN AIR HANDLING UNIT
Keywords:Vibration analysis, Finite element analysis, Operational deflection shape, Experimental modal analysis, Air handling unit
AbstractIn this paper, vibration methods were conducted for an air-handling unit (AHU) assembly that experiences a vibration-related problem. The methods that were utilised are the Finite Element Analysis (FEA), the Experimental Modal Analysis (EMA) and the Operating Deflection Shapes (ODS). Mathematical and analytical modelling were also done before the experimental methods where they are used as reference for estimation of the results. Results between the theoretical and experimental methodologies were compared for analysis. The corresponding mode shapes were used as reference for finding the relevant experimental mode shapes of the AHU. The ODS results show the belt pulley system that connects the motor and the fan of the AHU experienced a strong axial vibration as supported by the initial vibration testing results. It was hypothesised that the AHU might be suffering from belt misalignment problem that introduces vibration to the whole AHU structure resulting in high vibration displacements.
W. D. Marsc r â€œH w t Us Im ct T sting t lv Pum Vibr ti n Pr bl m â€ in Proceedings EPRI Power Plant Pumps Symposium, Florida, 1991.
M. M. Onari and P. A. Boyadjis, â€œ lving tructur l Vibr ti n Pr bl ms Using O r ting D fl cti n n FInit El m nt An lysis â€ in Pr c ings f t
Twenty-Fifth International Pump Users Symposium , 2009
L. Wang n Z. P n â€œEx rim nt l l An lysis of Fan Vibration Frequncy â€ Applied Mechanics and Materials, pp. pp. 138-139, 2012.
C. Wang n J. C. . L i â€œVibr ti n An lysis f n In ucti n t r â€ J urn l f
Sound and Vibration, pp. pp. 733-756, 1999
F. Is ib s i . tsus it . N n K. T n ki â€œC ange of Mechanical Natural
Fr qu nci s f In ucti n t r â€ IEEE Tr ns cti ns n In ustry A lic ti ns . .
R. D. Blevins, Formulas for Natural Frequency and Mode Shape, New York: Van Nostrand Reinhold Company, 1979.
S. Rao, Mechanical Vibrations: Fifth Edition, New Jersey: Prentice Hall, 2011
S. Timoshenko, D. H. Young and J. W. Weaver, Vibration Problems in Engineering (4th ed.), New York: John Wiley, 1974.
A. Hr nnik ff â€œ luti n f Pr bl ms in El sticity by t Fr m W rk t â€
Journal of Applied Mechanics, vol. Vol. 8, no. No. 4, pp. pp. 169-175, December 1941
D. cH nry â€œA L ttic An l gy f r t luti n f Pl n tr ss Pr bl ms â€ J urn l fInstitution of Civil Engineers, vol. Vol. 21, pp. pp. 59-82, 194.
N. M. N wm rk â€œNum ric l Et s f An lysis in B rs Pl t s n El stic B i s â€ in Numerical Methods in Analysis in Engineering, Macmillan, 1949.
. L vy â€œ tructur l An lysis n Influ nc C ffici nts f r D lt Wings â€ J urn l f Aeronautical Sciences, vol. Vol. 20, no. 7, pp. pp. 449-454, 1953.
J.H. Argyris â€œEn rgy T r ms n tructur l An lysis â€ in Aircr ft Engin ring 1955.
J. H. Argyris and S. Kelsey, Energy Theorems and Structural ANalysis, London: Butterworth, 1960.
J. He and Z.-F. Fu, Modal Analysis, Oxford: Butterworth-Heinemann, 2001.
C. Scheffer and P. Girdhar, Practical Machinery Vibration Analysis & Predictive Maintenance, MA: Elsevier, 2004.
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