Scanning System for Characterization of Vibration, Acoustic Radiation and Scattering from Underwater
Abstract
The ability to characterize the acoustic field scattered from or radiated by submerged elastic structures is of central importance f,or numerous naval applications. Prominent among those applications is the classical problem of fluid-structure interaction of finite, cylinders subjected to internal or external excitation. Current design methods for naval architectures have enabled rapid concept i,terations that often outpace the ability to computationally simulate their vibro-acoustic response. The instrumentation system propo,sed here will create a vibro-acoustic measurement capability to address an existing gap in the ability to characterize scattering an,d radiation of acoustical energy in order to accelerate the design process for future naval systems that must consider acoustic perf,ormance. The proposed system has a target frequency band of 300 Hz 10 kHz with the capability to measure acoustic signals up to 12,5 kHz and direct surface velocity measurements of structural vibrations up to 50 kHz for the purpose of characterizing in high fidel,ity the three-dimensional vibro-acoustic responses of scale-model advanced naval architecture concepts. Importantly, the proposed m,easurement system is ideally suited for determining the far-field directivity pattern of a sound-emitting object by taking measureme,nts within the near field of the object, thus minimizing the volume required for the measurement. Further, the ability of the propos,ed system to directly measure surface velocities associated with radiating and non-radiating vibrational modes as well as highly loc,alized vibrational motion associated with poorly isolated internal sources or fabrication defects is a significant improvement in ex,isting measurement systems, which can be exploited to accelerate numerous Navy-sponsored research efforts.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Jul 13, 2022
- Source ID
- N000142212381
Entities
People
- Michael R Haberman
Organizations
- Office of Naval Research
- United States Navy
- University of Texas at Austin