Analysis of vibration transmission through periodic structures using a power flow approach

Abstract

The analysis of the parameters controlling the transmission of vibrational power through coupled structures can be performed using a structural power flow approach. In this paper, a periodic structure is considered with equal length spans between the stiffeners or the supports. With the power flow technique, the global structure is divided into subelements for which structural mobility functions can be defined. Also, structural mobility elements can be introduced at the interfaces between the subelements to represent different types of supports or stiffeners or some other interface characteristic. Thus, using this approach, the influence of such parameters as translational and rotational inertia, stiffness, and damping of the supports or stiffeners, and the stiffness, damping, and other structural characteristics of the separate spans, can be determined using this technique. This approach is applied here to a thin periodic beam with different types of stiffeners and supports, and some of the analysis results are presented. [Work supported by NASA.]