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原文传递 Repeatability Modeling for Wind-Tunnel Measurements: Results for Three Langley Facilities.

题名：	Repeatability Modeling for Wind-Tunnel Measurements: Results for Three Langley Facilities.
作者：	Hemsch, M. J.; Houlden, H. P.
关键词：	Acceptability; Dynamic Pressure; Estimating; Mathematical Models; Reliability; Validity; Wind Tunnel Tests; Wind Tunnels
摘要：	Data from extensive check standard tests of seven measurement processes in three NASA Langley Research Center wind tunnels are statistically analyzed to test a simple model previously presented in 2000 for characterizing short-term, within-test and across-test repeatability. The analysis is intended to support process improvement and development of uncertainty models for the measurements. The analysis suggests that the repeatability can be estimated adequately as a function of only the test section dynamic pressure over a two-orders- of-magnitude dynamic pressure range. As expected for low instrument loading, short-term coefficient repeatability is determined by the resolution of the instrument alone (air off). However, as previously pointed out, for the highest dynamic pressure range the coefficient repeatability appears to be independent of dynamic pressure, thus presenting a lower floor for the standard deviation for all three time frames. The simple repeatability model is shown to be adequate for all of the cases presented and for all three time frames.
报告类型：	科技报告