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DSS-14 subreflector actuator dynamics during the Landers earthquakeThe 28 Jun. 1992 Landers earthquake ground motion records at the Echo site (DSS-12 antenna) were adjusted to provide a better match with spectra from the measured Mars site (DSS-14 antenna) instrument tower response. A finite-element model of the antenna structural system was analyzed for response to this ground motion. Dynamic forces and displacements were computed in the locality of components that had failed during the earthquake. Calculated forces in the range of 30,000 to 35,000 lb on failed Y-axis actuator U-joints were consistent with laboratory load tests. The load capacity of these joints was found to be below the range of 34,000 to 42,000 lb. Dynamic amplification factors of from 6 to 16 were computed for the quadripod apex accelerations with respect to the ground accelerations. The largest factor--25--was found at the outboard end of the X-actuator.
Document ID
19930020411
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Levy, R. (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Strain, D. (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Date Acquired
September 6, 2013
Publication Date
May 15, 1993
Publication Information
Publication: The Telecommunications and Data Acquisition Report
Subject Category
Geophysics
Accession Number
93N29600
Funding Number(s)
PROJECT: RTOP 314-30-45-10-21
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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IDRelationTitle19930020397Collected WorksThe Telecommunications and Data Acquisition Report
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