The estimation of random response of a coupled cylindrical-conical shell system using statistical energy analysis

Abstract EN

A composite, coupled, thin cylindrical-conical shell system made of polyester resin reinforced by uniformly distributed, chopped, E-glass is analyzed using Statistical Energy Analysis.

Response displacement estimate of the two subsystems are obtained due the excitation of the cylinder by a broadband white noise of constant spectral density function.

The paper is an attempt to study the validity of the SEA hypothesis as applied to coupled built-up structures.

This is carried out by the comparison of response estimates of the coupled system in different 1 / 3rd octave frequency bands with those obtained from Finite Element method.

The outcome of this work shows that SEA is a powerful tool for the vibration analysis of coupled systems at high frequencies when the number of interacting coupled resonant modes is high.

Percentage error obtained from the comparison of results drops sharply as one goes further in frequency.

This paper recommends that the user of SEA must always be aware of the uncertainty of the results obtained.

The uncertainty may arise from the improper selection of subsystems, coupling loss factors, and the number of interacting resonant modes of the coupled system.