Justification for wide band instrumentation in test cell A Page: 4 of 22
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JUSTIFICATION FOR WIDE BAND INSTRUMENTATION
TEST CELL "A" '
This document will present factors justifying the procurement of 195
obannels of wide band instrumentation for use at Test Cell "A" during NRX-A-1
During this testing it will be necessary to evaluate reactor behavior by
determining the following:
A. Sources of vibration in the reactor and propellant feed system.
B. If vibrations exist, how they are transmitted.
C. The effects of vibration on the various components.
D. The effects of thermal gradients and mechanical displacements.
E. The correlation between experimental results and the analytical models
used for computation.
F. The modifications shown to be necessary.
These six goals can be accomplished by high-frequency measurements (to approximately
1000 cycles) of certain pressures, differential pressures, strains, and vibrations.
Analysis of these tests will lead to performance evaluation and development of new
Previous tests on similar type reactors indicate the existence of oscillatory
forces capable of causing reactor failure. 'The NRI reactor is designed to eliminate
such oscillation but verification of this design can only be accomplished through
actual tests with an adequate instrumentation system, namely, wide band instrumenta-
tion. This system would determine the existence of oscillatory forces and the manner
in which the force is transmitted to reactor components. These forces are non-
sinusoidal and non-repetitive, requiring instruments with rapid response times, and
a wide band data recording system to sense and record them without deterioration of
wave shape and frequency.
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Norkin, H. & Schaedel, C.T. Justification for wide band instrumentation in test cell A, report, April 1, 1963; Pittsburgh, Pennsylvania. (https://digital.library.unt.edu/ark:/67531/metadc1022134/m1/4/: accessed April 25, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.