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.
588-598
Cheer, Jordan
8e452f50-4c7d-4d4e-913a-34015e99b9dc
Kournoutos, Nikolaos
e50839ec-f9f9-43d6-9240-e8c7b551a448
August 2020
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), .
(doi:10.1121/10.0001681).
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.
Text
Investigation of a directional warning sound system for electric vehicles based on structural vibration
- Accepted Manuscript
More information
Accepted/In Press date: 15 July 2020
e-pub ahead of print date: 4 August 2020
Published date: August 2020
Additional Information:
Funding Information:
The authors would like to thank the industrial partners in Applus+ IDIADA for generously allowing the use of their vehicle testing facilities in Tarragona, Spain, and for their assistance in conducting the experimental work presented in this paper. This research was funded by European Commission through its support of the Marie Sklodowska Curie program through the ETN PBNv2 project (GA 721615).
Publisher Copyright:
© 2020 Author(s).
Identifiers
Local EPrints ID: 442630
URI: http://eprints.soton.ac.uk/id/eprint/442630
ISSN: 0001-4966
PURE UUID: 85bc59c4-b19a-48e0-a2e3-7e897fbfb095
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Date deposited: 21 Jul 2020 16:34
Last modified: 17 Mar 2024 05:45
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Author:
Nikolaos Kournoutos
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