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The effect of sensor spacing on wind measurements at the Shuttle Landing FacilityThis document presents results of a field study of the effect of sensor spacing on the validity of wind measurements at the Space Shuttle landing Facility (SLF). Standard measurements are made at one second intervals from 30 foot (9.1m) towers located 500 feet (152m) from the SLF centerline. The centerline winds are not exactly the same as those measured by the towers. This study quantifies the differences as a function of statistics of the observed winds and distance between the measurements and points of interest. The field program used logarithmically spaced portable wind towers to measure wind speed and direction over a range of conditions. Correlations, spectra, moments, and structure functions were computed. A universal normalization for structure functions was devised. The normalized structure functions increase as the 2/3 power of separation distance until an asymptotic value is approached. This occurs at spacings of several hundred feet (about 100m). At larger spacings, the structure functions are bounded by the asymptote. This enables quantitative estimates of the expected differences between the winds at the measurement point and the points of interest to be made from the measured wind statistics. A procedure is provided for making these estimates.
Document ID
19950016593
Acquisition Source
Legacy CDMS
Document Type
Technical Publication (TP)
Authors
Merceret, Francis J. (NASA John F. Kennedy Space Center Cocoa Beach, FL, United States)
Date Acquired
September 6, 2013
Publication Date
January 1, 1995
Subject Category
Meteorology And Climatology
Report/Patent Number
NASA-TP-3529
NAS 1.60:3529
Accession Number
95N23010
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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