Accession Number : ADA301845

Title :   Portable Instrument Package (PORTAPAK) for the Measurement of Noise and Vibration,

Corporate Author : AIR FORCE AEROSPACE MEDICAL RESEARCH LAB WRIGHT-PATTERSON AFB OH

Personal Author(s) : Hille, Harald K. ; Rose, J. F., Jr. ; Kettler, L. K.

PDF Url : ADA301845

Report Date : MAR 1970

Pagination or Media Count : 26

Abstract : A portable, self-contained, instrument package (PORTAPAK) for recording noise and vibration environmental data in and around aircraft was developed. It was especially designed for use in field surveys where conditions limit the use of larger- and heavier recording equipment. The battery-operated recording system consists of a tape recorder and associated circuitry, a condenser microphone and a linear servo accelerometer as the vibration transducer. It weighs only 30 pounds and the overall dimensions are 17 inches wide, 14% inches deep and 51/2 inches high. Noise levels from 54 to 150 db SPL in the frequency range from 20 to 16,000 Hz and acceleration levels from 0.3 to 5 G in the frequency range from dc to 30 Hz can he measured. A complete description of the system is included and its performance characteristics for both the acoustical and vibration recording sec- tion are given.

Descriptors :   *VIBRATION, *ACOUSTIC MEASUREMENT, *AIRCRAFT NOISE, SIGNAL PROCESSING, PORTABLE EQUIPMENT, ACCELEROMETERS, SELF CONTAINED, DATA ACQUISITION, LIGHTWEIGHT, ACOUSTIC SIGNALS, MICROPHONES, ACOUSTIC DATA, SOUND PRESSURE, NOISE POLLUTION, SERVOMECHANISMS, FREQUENCY RESPONSE, ELECTRICAL EQUIPMENT, DYNAMIC RANGE, ELECTROACOUSTIC TRANSDUCERS, PLAYBACK, TAPE RECORDERS, ACOUSTIC RECORDING SYSTEMS.

Subject Categories : Electrical and Electronic Equipment
      Acoustics
      Recording and Playback Devices
      Noise Pollution and Control

Distribution Statement : APPROVED FOR PUBLIC RELEASE