System Component Coupling for Structure-Borne Noise Isolation Studies

Document Number: 971460

Date Published: May 1997

Author(s):
James F Unruh - Southwest Research Institute
Douglas J Fox - Southwest Research Institute

Abstract:
Control of structure-borne noise transmission into an aircraft cabin generated from component excitation, such as rotor/engine vibration imbalance or firing excitations or from auxiliary-equipment-induced vibrations, can be studied empirically via impedance characterization of the system components and application of appropriate component coupling procedures. The present study was aimed at demonstrating the usefulness of such impedance modeling techniques as applied to a Bell 206B rotorcraft and a Cessna TR182 general aviation aircraft. Simulated rotor/engine excitations were applied to the assembled aircraft systems to provide baseline structure-borne noise transmission data. Thereafter, impedance tests of the system components were carried out to provide a database 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 when using a high-quality component impeda database. Model results are also presented for the case where questionable accuracy exists in the component database.

File Size: 1295K
Product Status: In Stock

See other papers presented at General, Corporate & Regional Aviation Meeting & Exposition, April 1997, Wichita, KS, USA, Session: Noise

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