Accession Number : AD0343047

Title :   Underwater Sound Simulator,

Corporate Author : NAVAL RESEARCH LAB WASHINGTON DC

Personal Author(s) : Krueger, D. A. ; Lamson, W. M., Jr. ; Cybulski, J.

Report Date : 19 SEP 1960

Pagination or Media Count : 34

Abstract : A system has been developed which can produce underwater sound very similar to the aural sig natures of ships at sea. The complete system, weighing 825 pounds in air, consists of a float and an electronics package suspended at the end of a length of wire cable. The electronics package contains a tape-playystem, the necessary preamplifiers and power amplifiers, all transistorized, a high-efficiency battery, a control system, and high-performance, lightweight transducers. The system was evaluated at NRL, and was tested in the Atlantic Ocean with Task Group Alpha. Although the response of the present system =2.5 db from 500 cps to 3.5 kc, is considered inadequate for simulation of many ships, some ships at high speeds can be effec tively simulated, according to listening tests with the submarine sonar operators in Task Group Alpha. The necessary frequency response for relatively effective simulation of most ships was determined to be from 100 cps to 5 kc. It may be possible to use simulator source levels of as much as an order of magnitude less than that of the original ship; a study to determine the effects of the ocean medium on the effec tiveness of simulator transmission is recommend ed. (Author)

Descriptors :   *UNDERWATER SOUND, *UNDERWATER SOUND, SIMULATION, TRANSIS, BATTERIES AND COMPONENTS, SIMULATION, TRANSISTOR AMPLIFIERS, PREAMPLIFIERS, TRANSIS, CONTROL SYSTEMS, POWER SUPPLIES, BATTERIES AND COMPONENTS.

Subject Categories : Electrical and Electronic Equipment
      Marine Engineering
      Acoustic Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE