AVRG: A PDP 8/I Data Acquisition and Averaging Program for Synchronous Hot Wire Measurements.

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Abstract:

The program, in function-modified FOCAL, is specifically designed to enable measurements to be performed on oscillating vertical velocity profiles in the mouth of a flow-excited cavity resonator. Simultaneous hot wire and pressure microphone data samples are recorded at an exact multiple 20X of the oscillation frequency so as to obtain a synchronous record of the cyclic variation of longitudinal stream velocity at many points in the mouth region. Data is atuomatically averaged over 100-cycle intervals to remove turbulent background variation. From the stored data, either two or three dimensional velocity profile information can be reconstructed, using sound pressure at the base of the cavity as a phase reference. Options are provided for Fourier analysis, real time oscilloscope display, and TTY printout. Author

Author(s):
Elder, Samuel A.
Author Organization(s):
NAVAL ACADEMY ANNAPOLIS MD MICHELSON PHYSICAL LAB
Descriptive Note:
Research rept.,
Pagination:
0027

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
E7302
 Subject Terms
Communities of Interest:
No COI(s) Identified
Descriptor(s):
(*CAVITY RESONATORS, DATA PROCESSING), (*COMPUTER PROGRAMS, INSTRUCTION MANUALS), SOUND TRANSMISSION, VELOCITY, WIND TUNNELS, FOURIER ANALYSIS
Field(s)/Group(s):
Computer Programming and Software, Test Facilities, Equipment and Methods, Acoustics, Fluid Mechanics
Keyword(s):
ACOUSTIC VELOCITY, PDP 8 I COMPUTERS, FOCAL PROGRAMMING LANGUAGE, HOT WIRE ANEMOMETERS, DATA ACQUISITION
Report Date:
1973 May 31