The Influence of Constrained Layer Damping on Modal Parameters of Thin Cylindrical Shell

doi:10.3969/j.issn.1000-1093.2016.07.024

Abstract

Abstract: The influence of constrained layer damping (CLD) on the modal parameters of thin cylindrical shell (TCS) is investigated. In order to fully understand the vibration characteristics of TCS, the natural frequencies and modal shapes of TCS are roughly obtained by finite element method. An experiment system is established to measure the modal parameters of the shell with constrained layer with high accuracy and efficiency, and the corresponding test methods and procedures which are suitable for measuring the modal parameters of the shell with or without constrained layer are also proposed. CLD material is made into the annular slices with different sizes, and the modal parameters of TCS with or without constrained layer are accurately obtained. Based on the measured results, the influences of varied dimensional parameters of such constrained layer on natural frequency, mode shape and damping of the shell structure are analyzed in details. It is discovered that CLD may reduce the natural frequency of TCS, but it can effectively improve its damping characteristics.

Key words: vibration and wave, constrained layer damping, thin cylindrical shell, modal parameter, influence analysis, test method

CLC Number:

TB53

LI Hui， ZHANG Lin-lin， CHANG Yong-le， WEN Bang-chun. The Influence of Constrained Layer Damping on Modal Parameters of Thin Cylindrical Shell[J]. Acta Armamentarii, 2016, 37(7): 1337-1344.

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