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Design and Test of the Operational In-Situ Gage for Solid Propellant Surveillance.
Final rept. May 73-Nov 74,
AEROJET SOLID PROPULSION CO SACRAMENTO CALIF
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The objective of this program was to develop practical instrumentation hardware for solid rocket motor surveillance. The approach was to reduce to practice existing concepts of grain instrumentation and telemetry using a modular design concept in which each unit consists of a power sourcetransmitter module, a sensor, and a sensor-to-transmitter interface module. A previous program gave the Duomorph sensor, a device for making in-situ measurements of propellant moduli. The present program made improvements in the Duomorph design plus the development of a modular design for the telemetry units. This latter design permits the use of a wide range of devices for measuring the stress, strain, temperature or dynamic mechanical properties at a point in the grain. This report describes the Duomorph designs, their operation, and the supporting analyses. The telemetry modules are described with respect to their electronic circuits, packaging, installation and operational safety. Laboratory models of the Duomorph sensor have demonstrated a precision of about 2. Several approaches for improving this precision are discussed. Whether these refinements are needed will depend upon the accuracy required for a given application. Analyses performed to establish the relationship between Duomorph output data and the viscoelastic properties of the continuum are presented.
APPROVED FOR PUBLIC RELEASE