Abstract
Projectors for the acoustical radiator for tactical search (ARTS) program must be very thin, to minimize drag, while at the same time produce large surface displacements in the 70- to 300-Hz band. To accommodate these requirements, the projectors are flat pads of thickness 0.1 m laminated from 1400 layers of polyurethane film that has deposited, on one side, a 300-Å aluminum electrode. The individual projector pads are to be arrayed in a self-propelled vehicle that is 100 m deep, 3 m long, and 0.2 m wide, and that is capable of stable operation to 15 kn. Polyurethane was chosen for the transduction material mostly because of its small modulus (15 MPa) and large displacement coefficient (10 Å/V). The low-Q resonance for an individual projector pad, determined by the stiffness of the pad and radiation mass, occurs at about 200 Hz; but this frequency is expected to be lowered to 150 Hz for the array of projectors, owing to a greater radiation mass. Since polyurethane film has not before been used as a transduction material, its electrostrictive and mechanical properties are described. The projectors are fabricated in the manner of polymeric film capacitors, with some modifications.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.