Hardware and software improvements to a paced data acquisition system for turbomachines
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Authors
McCarville, Patrick Anthony
Subjects
Programmable
Synchronized sampling
Digital phase lock loop
Direct memory access
Synchronized sampling
Digital phase lock loop
Direct memory access
Advisors
Shreeve, Raymond P.
Date of Issue
1981-06
Date
June 1981
Publisher
Monterey, California. Naval Postgraduate School
Language
en_US
Abstract
Modification of the phase lock loop synchronizing circuits and of the method of input/output communication used in a synchronized data sampling system, are reported. A device known as PACER
which used an analog phase lock loop for synchronization and produced a non linear set of synchronizing pulses, was modified to use a CMOS digital phase lock loop, resulting in a linear set of pulses. The associated programming which controlled the data acquisition process and sequencing, was changed to use the direct memory access feature of the system computer. This enabled data, from high response pressure transducers mounted in a turbomachine, to be taken once every rotor revolution rather than once every ten revolutions. A user's manual for paced data acquisition is included.
Type
Thesis
Description
Series/Report No
Department
Aeronautics
Organization
Naval Postgraduate School (U.S.)
Identifiers
NPS Report Number
Sponsors
Funder
Format
Citation
Distribution Statement
Approved for public release; distribution is unlimited.
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.