Statistical Analysis of Repeat Test Results for Assessment of Wind Tunnel Data Quality

Murthy, Sundara H and Krishnan , Anjana (2012) Statistical Analysis of Repeat Test Results for Assessment of Wind Tunnel Data Quality. Project Report. NTAF, NAL.

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Abstract

A methodology for quantifying wind tunnel data quality from repeat tests is described. The methodology largely adopts the measurement uncertainty concepts and statistical analysis techniques recommended by AIAA Standards. Repeatability quality of measurements is quantified in terms of three statistical parameters viz., precision limit (or random uncertainty), tolerance interval and precision interval. A description of the methods used for determining these statistical parameters is given. A computer program developed to facilitate routine application of the above analysis to repeat test data obtained in the NAL 1.2m and 0.6m wind tunnels is described. To illustrate the application of the above methodology and use of the computer program an analysis of longitudinal aerodynamic data obtained from repeat tests on a typical fighter aircraft model in the 1.2m tunnel has been made. Results of this analysis along with a discussion of the same, and a comparison with similar results obtained on a commercial transport airplane configuration in the NASA 2.5m cryogenic tunnel are included in the report.

Item Type: Monograph (Project Report)
Subjects: MATHEMATICAL AND COMPUTER SCIENCES > Statistics and Probability
Depositing User: Anjana K Anjana Krishnan
Date Deposited: 03 Sep 2012 08:09
Last Modified: 03 Sep 2012 08:09
URI: http://nal-ir.nal.res.in/id/eprint/10701

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