Frequency response coupling technique for the estimation of the power transmission in multi-point-connected structures

This article presents a frequency response coupling technique for the prediction of the complex mechanical power in multi-point-connected structures. The motivation of this study originates from a real industrial application case concerning the evaluation of the power transmission from a large machine (source) to a flexible structure (cabin/receiver) when only forces and response data of the decoupled substructures (source, receiver, and connectors) can be measured and only acceleration/velocity response data of the whole coupled structure in operation are available. The predicted power can then be used as the input for further investigation on the vibro-acoustic behaviour of the receiver and for design optimisation in terms of noise and vibration reduction. The method is illustrated for a dynamic case representing many real situations of two flexible structures connected through multiple points. Comparison between experimental and numerical results, obtained in the case of a simplified assembled structure consisting of two coupled beams, is investigated.