Accession Number : AD0635079

Title :   AN UNMANNED SYSTEM FOR RECORDING STRESSES AND ACCELERATIONS ON SHIPS AT SEA.

Descriptive Note : Progress rept.,

Corporate Author : LESSELLS AND ASSOCIATES INC BOSTON MASS

Personal Author(s) : Fritch, D. J. ; Bailey,F. C.

Report Date : 03 JUN 1963

Pagination or Media Count : 29

Abstract : In order to obtain long-term statistical data on wave-induced bending moments, two dry-cargo ships have been equipped with stress transducers and automatic magnetic-tape recording instrumentation. One of these ships has also been equipped with accelerometers to provide information on seaway-induced loads on cargo. The transducers and their installation are described, as well as the data conditioning units, the tape recorder, and the programmer which allows sampling of the data at preselected intervals and continuous recording when pre- set stress levels are exceeded. The system has performed beyond expectation; data have been obtained on 36 round-trip voyages representing almost three ship-years of operation. Versatility of the unit in handling a variety of data inputs and adapting to various data reduction methods has been demonstrated. In addition, the data tapes are available for future analysis in a broad spectrum of naval design applications. Experience gained to date will permit future installations to be handled expeditiously and at minimum expense, with a high degree of reliability of the unit assured in service. (Author)

Descriptors :   (*SHIPS, MECHANICS), (*MAGNETIC RECORDING SYSTEMS, SHIPBOARD), STRESSES, ACCELERATION, STATISTICAL DATA, HYDRODYNAMICS, MOMENTS, LOADS(FORCES)

Subject Categories : Marine Engineering
      Recording and Playback Devices

Distribution Statement : APPROVED FOR PUBLIC RELEASE