Statistical analysis of repeat test results for assessment of wind tunnel data quality

Sundaramurthy, H (2009) Statistical analysis of repeat test results for assessment of wind tunnel data quality. In: National Conference on Wind Tunnel Testing (2009-IT2), 12-14 Mar 2009, IISc., Bangalore.

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Abstract

Proper assessment and documentation of data quality is an important aspect of wind tunnel testing activity. This paper describes a methodology for quantifying wind tunnel data quality from repeat tests. The methodology largely adopts the measurement uncertainty concepts and statistical analysis techniques recommended by AIAA standards. Repeatability quality of measurements is qualified 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 NAL 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 paper.

Item Type: Conference or Workshop Item (Paper)
Uncontrolled Keywords: Cryogenic tunnel;Fighter aircraft model;Longitudinal aerodynamic data;Wind tunnel
Subjects: AERONAUTICS > Aircraft Design, Testing & Performance
AERONAUTICS > Aerodynamics
Division/Department: National Trisonic Aerodynamic Facility
Depositing User: Ms. Alphones Mary
Date Deposited: 17 Aug 2009
Last Modified: 24 May 2010 09:56
URI: http://nal-ir.nal.res.in/id/eprint/5165

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