Accession Number : AD0429283

Title :   RESEARCH AND DEVELOPMENT REPORT,

Corporate Author : NAVAL BOILER AND TURBINE LAB PHILADELPHIA PA

Personal Author(s) : Reed,J.

Report Date : 05 DEC 1963

Pagination or Media Count : 25

Abstract : Recently, because of advances in the quieting of Naval machinery, it has become necessary to measure low level vibrations. This necessitates the calibration of the vibration transducers at low vibration levels from the low frequencies through a large frequency range. At the Naval Boiler and Turbine Laboratory, a displacement device using strain gages was designed and adapted to a shake table to measure its dynamic displacement. It was used successfully to calibrate a velocity transducer and an accelerometer at low vibration levels through an appreciable frequency range (down to 3.51 x 10 to the -6th cm single amplitude displacement, frequencies ranging from 5-150 cps). Because this high output device is used for measuring dynamic displacement and has a flat frequency response down to D.C., it inherently possesses very suitable characteristics for low frequency and low vibration level calibration of vibration transducers. It is superior to the interferometer method for measuring dynamic displacements because it utilizes strain gages which have infinite resolution. (Author)

Descriptors :   (*VIBRATION, TRANSDUCERS), VELOCITY, ACCELERATION, CALIBRATION, HIGH FREQUENCY, STRAIN GAGES, DYNAMICS, RESOLUTION, MICROSCOPES, INTERFEROMETERS, STROBOSCOPES, INSTRUMENTATION

Distribution Statement : APPROVED FOR PUBLIC RELEASE