MODAL ANALYSIS OF COUPLED STRUCTURES AND PARAMETRIC RELATION OF THE COUPLED AND UNCOUPLED NATURAL FREQUENCY OF CYLINDERS BY FINITE ELEMENT ANALYSIS

Abstract

The purpose of this investigation is to explore the interaction of fluids with thin cylindrical structures of finite length. Our emphasis is on describing or approximating the coupled natural frequency of the fluid-filled structures as a function of modes of the uncoupled structures. This paper reviews the historical and theoretical findings of the relevant phenomenon important to the structural acoustics, modal frequencies of the cylindrical shell structures. The study focuses on the parametric analysis of fluid coupled thin cylindrical structures by Finite Element Analysis. Our specific contribution is defining a factor for analyzing and predicting the natural frequency of the water coupled cylinders for a given empty cylinder. Proposed a condition to differentiate the strong and weak coupling of the fluid and structure from a structural analysis point of view.