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Directivity control using a structural actuator array

Directivity control using a structural actuator array
Directivity control using a structural actuator array
Directional sound fields can be generated by arrays of multiple sound sources, with the most common and straightforward method being an array of loudspeaker drivers. Although such a system, when appropriately designed, is capable of high levels of directivity control over a broad bandwidth and with good audio quality, it can be prohibitively expensive and too fragile in certain applications. This work presents and investigates the idea of using an array of actuators mounted to a structure to generate a directional sound field. Structural actuators have previously been used as an affordable and robust alternative to conventional loudspeakers, particularly in applications where the actuators can be used to drive a structure that would already be in place to radiate the desired sound field and where the required audio quality is lower. By distributing a number of actuators on a structure, and controlling the relative amplitudes and phases with which they are driven, it is possible to manipulate the structural vibration such that it generates a controlled directional sound field, similar to that resulting from an array of individual sound sources. In this work, an analytical model is first formulated of a rectangular panel excited by an array of structural actuators, which are approximated as point forces acting perpendicularly to the surface of the panel. This model is used to perform a simulation based parametric study, which provides insights into the design trade-offs for a structural actuator array based system. In particular, this considers how the number of actuators, their geometry and the dimensions of the structure influence the directivity control and achievable bandwidth. Based on this parametric study, a structural actuator array is assembled using a rectangular aluminium panel and six actuators. The system is tested and evaluated through measurements in an anechoic chamber.
directivity control, inertial actuator
Kournoutos, Nikolaos
4caca7a8-e970-4875-a36d-bbb2d6155819
Cheer, Jordan
8e452f50-4c7d-4d4e-913a-34015e99b9dc
Kournoutos, Nikolaos
4caca7a8-e970-4875-a36d-bbb2d6155819
Cheer, Jordan
8e452f50-4c7d-4d4e-913a-34015e99b9dc

Kournoutos, Nikolaos and Cheer, Jordan (2019) Directivity control using a structural actuator array. In Proceedings of 26th International Congress on Sound and Vibration, ICSV26. 8 pp .

Record type: Conference or Workshop Item (Paper)

Abstract

Directional sound fields can be generated by arrays of multiple sound sources, with the most common and straightforward method being an array of loudspeaker drivers. Although such a system, when appropriately designed, is capable of high levels of directivity control over a broad bandwidth and with good audio quality, it can be prohibitively expensive and too fragile in certain applications. This work presents and investigates the idea of using an array of actuators mounted to a structure to generate a directional sound field. Structural actuators have previously been used as an affordable and robust alternative to conventional loudspeakers, particularly in applications where the actuators can be used to drive a structure that would already be in place to radiate the desired sound field and where the required audio quality is lower. By distributing a number of actuators on a structure, and controlling the relative amplitudes and phases with which they are driven, it is possible to manipulate the structural vibration such that it generates a controlled directional sound field, similar to that resulting from an array of individual sound sources. In this work, an analytical model is first formulated of a rectangular panel excited by an array of structural actuators, which are approximated as point forces acting perpendicularly to the surface of the panel. This model is used to perform a simulation based parametric study, which provides insights into the design trade-offs for a structural actuator array based system. In particular, this considers how the number of actuators, their geometry and the dimensions of the structure influence the directivity control and achievable bandwidth. Based on this parametric study, a structural actuator array is assembled using a rectangular aluminium panel and six actuators. The system is tested and evaluated through measurements in an anechoic chamber.

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DIRECTIVITY CONTROL USING A STRUCTURAL ACTUATOR ARRAY - Accepted Manuscript
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More information

Accepted/In Press date: 30 April 2019
Published date: 7 July 2019
Venue - Dates: 26th International Congress on Sound and Vibration, Canada, 2019-07-07 - 2019-07-11
Keywords: directivity control, inertial actuator

Identifiers

Local EPrints ID: 432192
URI: http://eprints.soton.ac.uk/id/eprint/432192
PURE UUID: 708e874d-1aa9-4a00-b95a-f06d50dd96f4
ORCID for Jordan Cheer: ORCID iD orcid.org/0000-0002-0552-5506

Catalogue record

Date deposited: 03 Jul 2019 16:30
Last modified: 27 Jan 2020 13:44

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