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Investigation of a directional warning sound system for electric vehicles based on structural vibration

Investigation of a directional warning sound system for electric vehicles based on structural vibration
Investigation of a directional warning sound system for electric vehicles based on structural vibration
Warning sound systems for electric vehicles with advanced beamforming capabilities have been investigated in the past. Despite showing promising performance, such technologies have yet to be adopted by the industry, as implementation costs are generally too high, and the components too fragile for implementation. A lower cost solution with higher durability could be achieved by using an array of inertial actuators instead of loudspeakers. These actuators can be attached directly to the body of the vehicle and thus require minimal design modifications. A directional sound field can then be radiated by controlling the vibration of the panel, via adjustments to the relative magnitude and phase of the signals driving the array. This paper presents an experimental investigation of an inertial actuator-based warning sound system. A vehicle placed in a semi-anechoic environment is used to investigate different array configurations in terms of the resulting sound field directivity and the leakage of sound into the cabin. Results indicate that the most efficient configuration investigated has the actuators attached to the front bumper of the vehicle. Using this arrangement, real-time measurements for different beamformer settings are performed to obtain a thorough picture of the performance of the system across frequency and steering angle.
0001-4966
588-598
Cheer, Jordan
8e452f50-4c7d-4d4e-913a-34015e99b9dc
Kournoutos, Nikolaos
e50839ec-f9f9-43d6-9240-e8c7b551a448
Cheer, Jordan
8e452f50-4c7d-4d4e-913a-34015e99b9dc
Kournoutos, Nikolaos
e50839ec-f9f9-43d6-9240-e8c7b551a448

Cheer, Jordan and Kournoutos, Nikolaos (2020) Investigation of a directional warning sound system for electric vehicles based on structural vibration. Journal of the Acoustical Society of America, 148 (2), 588-598. (doi:10.1121/10.0001681).

Record type: Article

Abstract

Warning sound systems for electric vehicles with advanced beamforming capabilities have been investigated in the past. Despite showing promising performance, such technologies have yet to be adopted by the industry, as implementation costs are generally too high, and the components too fragile for implementation. A lower cost solution with higher durability could be achieved by using an array of inertial actuators instead of loudspeakers. These actuators can be attached directly to the body of the vehicle and thus require minimal design modifications. A directional sound field can then be radiated by controlling the vibration of the panel, via adjustments to the relative magnitude and phase of the signals driving the array. This paper presents an experimental investigation of an inertial actuator-based warning sound system. A vehicle placed in a semi-anechoic environment is used to investigate different array configurations in terms of the resulting sound field directivity and the leakage of sound into the cabin. Results indicate that the most efficient configuration investigated has the actuators attached to the front bumper of the vehicle. Using this arrangement, real-time measurements for different beamformer settings are performed to obtain a thorough picture of the performance of the system across frequency and steering angle.

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Investigation of a directional warning sound system for electric vehicles based on structural vibration - Accepted Manuscript
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Accepted/In Press date: 15 July 2020
e-pub ahead of print date: 4 August 2020
Published date: August 2020

Identifiers

Local EPrints ID: 442630
URI: http://eprints.soton.ac.uk/id/eprint/442630
ISSN: 0001-4966
PURE UUID: 85bc59c4-b19a-48e0-a2e3-7e897fbfb095
ORCID for Jordan Cheer: ORCID iD orcid.org/0000-0002-0552-5506

Catalogue record

Date deposited: 21 Jul 2020 16:34
Last modified: 15 Jan 2021 05:01

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