Experimental analysis of Rayleigh's viscous damping method for a catenary tube subjected to vibration
Keywords:
Rayleigh viscous damping. Catenary tube. Frequency exciter experiment. Modal characterisation. Comparison between methods.Abstract
The objective of this work is to verify the Rayleigh viscous damping method, based on the linear combination of inertia and stiffness, usually used as a parameter for analyzing the dynamic behavior of risers via finite element applications. Its methodology is based on modal characterisation experiments with controlled vibration in a tube under catenary configuration. Thus, using a frequency exciter, uniaxial accelerometer and spectral analyzer (LMS Pimento) it was possible to determine natural frequencies and modal viscous damping. The analytical proposition confronted with experimental results demonstrates different correspondences according to the frequency range and the type of approach used. The smallest deviation obtained, relative to one aspect of the method, is equivalent to 35% between analytical-experimental values.
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