학술논문
Active control of target sound fields using structural-acoustic brightness applied to a ship model's acoustic signature.
Document Type
Academic Journal
Author
Ungnad S; Department of Mechanical and Civil Engineering, Helmut Schmidt University, Hamburg 22043, Germany.; Sachau D; Department of Mechanical and Civil Engineering, Helmut Schmidt University, Hamburg 22043, Germany.; Zerbs C; Müller-BBM Industry Solutions GmbH, Hamburg 22305, Germany.; Müller A; Müller-BBM Industry Solutions GmbH, Hamburg 22305, Germany.; Homm A; Technical Center for Ships and Naval Weapons, Maritime Technology and Research, Eckernförde 24340, Germany.
Source
Publisher: American Institute of Physics Country of Publication: United States NLM ID: 7503051 Publication Model: Print Cited Medium: Internet ISSN: 1520-8524 (Electronic) Linking ISSN: 00014966 NLM ISO Abbreviation: J Acoust Soc Am Subsets: PubMed not MEDLINE; MEDLINE
Subject
Language
English
Abstract
This manuscript presents a method for reproducing sound fields actively by using a vibrating submerged structure as the field reproduction source, with the target sound field to be reproduced defined in the frequency domain using the acoustic brightness approach. To balance the predetermination of a mono- or multi-zone target sound pressure field and the control effort required, singular value decomposition of the structural-acoustic system matrix is proposed. The dependency of the radiation efficiency into the target zone on the singular modes representing source and pressure modes is investigated using a wavenumber-domain approach. Furthermore, a feedforward control principle is adopted for adaptive sound-field reproduction with mode matching from the least squares perspective. Finally, an experiment is reported that involve synthesizing a tonal target underwater acoustic signature of a model of a fast attack craft (scale 1:8) at a measurement facility at Lake Plön in Germany. The results show that with the structural-acoustic brightness approach structural modes with radiation coupling into the target zone are excited and related pressure modes exhibit individual focus in the direction of hydrophones in use. Finally, a predetermined narrowband sound pressure field is actively reproduced at the hydrophone positions using inertial actuators and accelerometers on the ship model's hull.
(© 2024 Acoustical Society of America.)
(© 2024 Acoustical Society of America.)