Heat transfer in oscillatory flow. Progress report, January 1983-December 1983 Page: 9 of 40
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fed directly to the computer without the interference of digital to
analog and analog to digital converters.
d. Data Acquisition
A major improvement in our experimental facilities has been the
acquisition of a MINC-11 computer with all the necessary boards (D/A and
A/D converters, digital or analog output, multiplexer, etc.). We have
already prepared and tested software for all the necessary operations in
our laboratory. Many of these tasks were performed before by an HP5420
which of course is still available. However now we have the flexibility
to control and define the way of manipulating our data on line. More-
over, we can dump our raw data directly to an IBM 370 for further pro-
cessing.
The laboratory computer is the heart of the entire system. It con-
trols all other instruments, it displaces the measuring volume, it
checks continuously for the quality of the signal, it receives the data,
it manipulates them on the line and it stores them. The particular
arrangement for the present project is shown schematically in Fig. 6.
An outline of the flow chart of this operation is shown in Fig. 7. The
computer performs conditional averaging of the periodic signal at a
point and then orders the stepping motors to proceed to the next posi-
tion. According to the specific application, the LDV counters are
interrogated by the computer to insure proper operation of the system.
The software provides for input from encoders which would insure that
the micropositioning commands have been executed properly. Moreover,
the general condition of the tunnel will be recorded, namely speed, tem-
perature of the medium, and frequency of the imposed oscillation.
6
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Telionis, D. P. & Diller, T. E. Heat transfer in oscillatory flow. Progress report, January 1983-December 1983, report, January 1, 1983; Blacksburg, Virginia. (https://digital.library.unt.edu/ark:/67531/metadc1069990/m1/9/: accessed July 16, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.