Discussion of data, EML-1, reactor assembly axial vibration test, nozzle excitation Page: 4 of 12
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Frequencies of special interest are 62, 150, 400, 500, 1200 and 1700 cps. Pressure
vessel, outer reflector and core support plate exhibit acceleration magnification at 62 cps.
At 150 cps the core motions are amplified. At 400 cps, the pressure vessel, outer reflector and core
are moving, exhibiting relative acceleation ene a imons. The core support plate shows a
resonance at 500 cps. Other resonances occurring at 1200 and 1700 cps require further study.
The maximum transducer outputs are listed in Tables I and li, Table ill summarizes
the acceleration characteristics of the mau-spring system. This system had been previously
studied on the computer.
The system Impedance plots are shown in the Group C curves of TMI-1259. Major
component response plots are shown in the Group D curves. The X-Y response plots shown
we for a ) G sweep. Control of the input acceleration was at the nozzle flange. In the fre-
quency range from 50 - 90 cps, the input was manually held below 1 G because of excssive
A high system impedance exists at 62 cps. Pressure vessel magnifications occur at
62 and at 400 cps. Outer reflector magnifications occur at 62 and at 400 cps. Care magni-
fications as measured on a support block accelerometer, occur at 150 and 400 cps. Support
plate magnifications occur at 62,400 and 500 cps.
At 62 cps the pressure vessel and outer reflector are moving together and are magnified
over the input by a factor of 2-1/2 to 1. This anti-resonance point appears to be a result of
the simulated pressure vessel nozzle flexibility. A probe test of the pressure vessel at this
frequency indicates that it acts as a single ma s0
At 400 cps the pressure vessel, outer reflector and core acceleatlons em magnified.
The dome end support ring could be the cause of this magnification as a phase shift occurs at
this frequency between the pressure vessel and outer reflector.
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Burack, R.D. & Ettenson, N.J. Discussion of data, EML-1, reactor assembly axial vibration test, nozzle excitation, report, September 22, 1964; Pittsburgh, Pennsylvania. (https://digital.library.unt.edu/ark:/67531/metadc878693/m1/4/: accessed April 21, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.