Digital Programmable Timing Device for Fast Response Instrumentation in Rotating Machines.
NAVAL POSTGRADUATE SCHOOL MONTEREY CALIF
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The design, construction and test of an inexpensive computer peripheral device to control the acquisition of data from high response probes in periodic flows, is reported. The device RPACE was used with a Hewlett-Packard Model 21MX computer and 5610A AD converter to obtain Kulite probe measurements in a transonic compressor by synchronized sampling. A phased-locked-loop and counting circuits were used so that the moment of AD conversion always corresponded to a programmable displacement of a stationary probe with respect to the moving rotor blades - independent of RPM. Also, the rotor speed was measured digitally in one revolution of the shaft. The results of a survey of a rotor blade passage at a blade passing frequency of 4500 per sec. are included. Author
- Test Facilities, Equipment and Methods
- Non-Radio Communications