Study of the vibrations of rotating blades

Swaminadham, M (1977) Study of the vibrations of rotating blades. In: Design Engineering Technical Conference of American Society of Mechanical Engineers, 26-30 Sep 1977, Chicago, USA.

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Abstract

This paper presents the results of a study of the vibration characteristics of rotating, twisted and tapered blades. Rayleigh-Ritz method of solution is applied to obtain the eigenvalues. Suitable experiments are conducted and the experimental results are in good agreement with the theory. Indigenously available piezo-electric crystals are used both to excite and sense resonant frequencies of test blades under rotation up to 10,000 rpm. The output signals are acquired by means of slipring unit and the data is analyzed to identify the natural frequencies of test blades. Pretwist, taper and speed of rotation are shown to have considerable influence on the frequencies whereas pre-twist and decreasing width taper together will aid in one plane and counteract in another to cause changes in resonant frequencies of the rotating blades.

Item Type: Conference or Workshop Item (Paper)
Uncontrolled Keywords: Rayleigh-ritz method;Resonant frequencies;Rotor blades;Structural vibration;Eigenvalues;Piezoelecric crystals;Tapering;Twisting;Vibrational spectra
Subjects: AERONAUTICS > Aerodynamics
Division/Department: Propulsion Division
Depositing User: M/S ICAST NAL
Date Deposited: 06 Dec 2006
Last Modified: 24 May 2010 09:54
URI: http://nal-ir.nal.res.in/id/eprint/3639

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