Accession Number : ADD017712

Title :   Acoustic Monitor.

Descriptive Note : Patent, Filed 31 Mar 94, patented 5 Sep 95,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Morris, Richard A ; Tate, Ronald C ; Matteson, Milton A

Report Date : 05 Sep 1995

Pagination or Media Count : 7

Abstract : A system for real-time analysis of weld quality in an arc welding process. The system includes a transducer which receives acoustic signals generated during the welding process. The acoustic signals are then sampled and digitized. A signal processor calculates the root mean square and peak amplitudes of the digitized signals and transforms the digitized signal into a frequency domain signal. A data processor divides the frequency domain signal into a plurality of frequency bands and calculates the average power for each band. The average power values, in addition to the peak and root mean square amplitude values, are input to an artificial neural network for analysis of weld quality. Arc current and /or arc voltage signals may be input to the A/D converter alone or in combination with the acoustic signal data for subsequent signal processing and neural net work analysis. (MM)

Descriptors :   *ACOUSTIC SIGNALS, *ELECTRIC ARCS, *ARC WELDING, *PATENTS, SIGNAL PROCESSING, PEAK VALUES, NEURAL NETS, MONITORING, ACOUSTIC DETECTION, VOLTAGE, WELDS, FREQUENCY BANDS, DEFECTS(MATERIALS), QUALITY CONTROL, TRANSDUCERS, ELECTRIC CURRENT, ANALOG TO DIGITAL CONVERTERS, AMPLITUDE, FREQUENCY DOMAIN, ACOUSTIC DATA, DATA PROCESSING EQUIPMENT

Subject Categories : Fabrication Metallurgy
      Acoustics
      Electricity and Magnetism

Distribution Statement : APPROVED FOR PUBLIC RELEASE