title: Underwater sound radiation from an elastically coated plate with a discontinuity introduced by a signal conditioning plate.
abstract: Underwater structural sound radiation and reflection can be reduced by adding an elastic coating to a structure. To increase the signal-to-noise ratio of a detecting hydrophone placed in front of the coating, a signal conditioning plate (SCP) of finite size placed between the coating and the hydrophone is proposed to increase the local reflection of incoming sound. This paper studies the effects of a SCP as a distributed discontinuity on the general properties of the sound radiation of a coated plate. The discontinuity introduced by the SCP changes the vibration and radiated sound power of the coated plate by scattering and reflecting structural waves in the coating. The trapped modal response of the structural waves is also observed and found to be responsible for the increase of sound and vibration of the plate at the corresponding resonance frequencies.
authors.affiliation: School of Mechanical and Chemical Engineering, University of Western Australia, Crawley, Western Australia 6009, Australia.
authors.forename: Yanni
authors.initials: Y
authors.lastname: Zhang
authors.forename: Jie
authors.initials: J
authors.lastname: Pan
mesh_terms: D000162:Acoustics / Q000295:instrumentation*; D003198:Computer Simulation; D004548:Elasticity; D004867:Equipment Design; D008962:Models, Theoretical; D009038:Motion; D009716:Numerical Analysis, Computer-Assisted; D011312:Pressure; D012542:Scattering, Radiation; D012815:Signal Processing, Computer-Assisted; D059629:Signal-To-Noise Ratio; D013016:Sound; D013499:Surface Properties; D013997:Time Factors; D014159:Transducers; D014732:Vibration; D014867:Water
chemical_list: D014867:Water