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An acoustic radiator with integrated cavity and active control of surface vibration

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Author: Berkhoff, A. · Tajdari, F.
Type:article
Date:2017
Publisher: Audio Engineering Society
Source:Audio Engineering Society Convention paper presented at 142nd Convention 2017 may 20-23rd Berlin, Germany, 142nd Audio Engineering Society International Convention 2017, AES 2017. 20 May 2017 through 23 May 2017, 5 p.
Identifier: 777347
Keywords: Acoustics · Fluid structure interaction · Frequency response · Vibrations (mechanical) · Acoustic sources · Actuation principles · Decentralized feedback · Fundamental resonance · Plate structure · Radiating surface · Surface vibration · System efficiency · Plates (structural components) · 2015 Observation, Weapon & Protection Systems · AS - Acoustics & Sonar · TS - Technical Sciences

Abstract

This paper presents a method to realize an acoustic source for low frequencies with relatively small thickness. A honeycomb plate structure which is open on one side combines the radiating surface and the major part of the air cavity. The vibration of the plate is controlled with a decentralized feedback controller. The fundamental resonance caused by the mass of the plate and the compliance of the air cavity are controlled, as well as the first-order bending mode, while avoiding possible instabilities due to the fluid-structure interaction. The smooth and well defined frequency response enables robust feedforward control for further response equalization. The influence of different actuation principles on the overall system efficiency is compared.