Seismic-response analysis of engine test stand No. 1 Page: 10 of 80
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I. INTRODUCTION
Some years ago, the Atomic Energy Commission (AEC) began exploding
thermonuclear devices of considerable size and yield in its program for under-
ground testing of nuclear weapons at the Nevada Test Site. Structural-response
analyses of the Nuclear Rocket Development Station (NRDS) facilities at Jackass
Flats, Nevada were performed by several organizations prior to each test series.
The purpose was to ensure the structural integrity of the facility structures,
which are within 50 mi of the nuclear detonation center, where they would be
subjected to high ground shock and seismic-type disturbances. Structures and
facilities were modified where necessary. One set of analyses was performed
on Engine Test Stand No. 1 (ETS-1), which is in the northwest corner of NRDS.
During the seismic ground-motion disturbance, ETS-1 is stimulated into oscilla-
tions, the magnitudes of which determine dynamic loads and stresses.
The seismic response of the ETS-1 structure is primarily governed by
the magnitudes and distributions of the mass and stiffness elements and by the
degree of damping present. A knowledge of the response of the ETS-1 test-
stand structure to such an excitation is important, from the standpoint of
design to ensure its safe life and to protect the structure, equipment, and
personnel from excessive vibration damage or from injury.
A detailed seismic-response analysis was undertaken for ETS-1, objec-
tives of which can be grouped into two main categories: (1) to provide struc-
tural vibration characteristics of ETS-1 and (2) to evaluate the seismic
response of the ETS-1 structural components for a given seismic disturbance,
characterized by both horizontal and vertical acceleration-time histories.
The seismic-response analysis of ETS-1 was subdivided into three
phases. The objective of Phase I of the analysis was to formulate an ideal
structural dynamic model that was free of major mathematical complexity but
which would structurally and dynamically simulate the actual structure under
consideration. Considerable time and thought were given to this phase; the1
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Tow, D. Seismic-response analysis of engine test stand No. 1, report, November 1, 1969; Sacramento, California. (https://digital.library.unt.edu/ark:/67531/metadc1019730/m1/10/: accessed May 10, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.