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Dynamic stability of liquid‐filled cylindrical shells under vertical excitation, Part I: Experimental results
Author(s) -
Chiba M.,
Tani J.,
Yamaki N.
Publication year - 1987
Publication title -
earthquake engineering and structural dynamics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.218
H-Index - 127
eISSN - 1096-9845
pISSN - 0098-8847
DOI - 10.1002/eqe.4290150103
Subject(s) - instability , vibration , excitation , dimensionless quantity , cylinder , shell (structure) , mechanics , radius , parametric oscillator , displacement (psychology) , excited state , cantilever , materials science , resonance (particle physics) , amplitude , structural engineering , physics , optics , geometry , engineering , acoustics , atomic physics , composite material , mathematics , psychology , computer security , quantum mechanics , computer science , psychotherapist
Experimental studies have been carried out on the dynamic stability of a cantilever cylindrical shell partially filled with liquid, under vertical excitation. Two polyester test cylinders with radius 100 mm, thickness 0.25 mm, and lengths 113 and 227 mm were used. The test cylinder was harmonically excited with constant acceleration‐ or displacement‐amplitude. It was found that not only the parametric principal instability resonance but also the parametric combination involving two natural vibrations, each of which has the same circumferential wave number but different axial mode numbers, could occur. The latter type of vibration apparently has not been previously studied. By varying the dimensionless water height from 0.25 to 1.0 stepwise by 0.25 increments, the instability regions and vibration modes were determined for the two test cylinders. The response waves of shell wall and liquid free surface, and axial and circumferential vibration modes were also observed.