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Measured and predicted root-mean-square errors in square and triangular antenna mesh facetsDeflection shapes of square and equilateral triangular facets of two tricot-knit, gold plated molybdenum wire mesh antenna materials were measured and compared, on the basis of root mean square (rms) differences, with deflection shapes predicted by linear membrane theory, for several cases of biaxial mesh tension. The two mesh materials contained approximately 10 and 16 holes per linear inch, measured diagonally with respect to the course and wale directions. The deflection measurement system employed a non-contact eddy current proximity probe and an electromagnetic distance sensing probe in conjunction with a precision optical level. Despite experimental uncertainties, rms differences between measured and predicted deflection shapes suggest the following conclusions: that replacing flat antenna facets with facets conforming to parabolically curved structural members yields smaller rms surface error; that potential accuracy gains are greater for equilateral triangular facets than for square facets; and that linear membrane theory can be a useful tool in the design of tricot knit wire mesh antennas.
Document ID
19890008521
Acquisition Source
Legacy CDMS
Document Type
Technical Publication (TP)
Authors
Fichter, W. B. (NASA Langley Research Center Hampton, VA, United States)
Date Acquired
September 5, 2013
Publication Date
March 1, 1989
Subject Category
Structural Mechanics
Report/Patent Number
NAS 1.60:2896
NASA-TP-2896
L-16525
Accession Number
89N17892
Funding Number(s)
PROJECT: RTOP 506-43-41-02
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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