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A Study of Rotorcraft Structure‐Borne Noise Isolation Using Empirical Component Coupling

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Control of component excitation generated structure‐borne noise transmission into a rotorcraft cabin, such a s from rotor vibration imbalance, transmission excitations or auxiliary equipment induced vibrations, can he studied empirically via accelerance characterization of the system components and application of appropriate component coupling procedures. The present study was aimed at demonstrating the usefulness of such accelerance modeling techniques as applied to a Bell 206B rotorcraft. Simulated rotor excitations were applied to the assembled rotorcraft system to provide baseline structure‐borne noise transmission data. Thereafter, accelerance tests of the system components were carried out to provide a data base from which system component coupling studies were carried out. Results presented demonstrate the level of expected accuracy in predicted structure‐borne noise transmission from the component coupled model. Compliance was then analytically introduced at attachments between system components to evaluate the level of expected structure‐borne noise isolation for a given level of joint compliance.
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Document Type: Research Article

Affiliations: Southwest Research Institute, San Antonio, Texas

Publication date: 1999-07-01

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  • The Journal of the American Helicopter Society is the world's only scientific journal dedicated to vertical flight technology. It is a peer-reviewed technical journal published quarterly by AHS International and presents innovative papers covering the state-of-the-art in all disciplines of rotorcraft design, research and development. (Please note that AHS members receive significant discounts on articles and subscriptions.)

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