SAE AIR 4979 : 2012

ESTIMATION OF MEASUREMENT UNCERTAINTY IN ENGINE TESTS BASED ON NATO AGARD UNIFORM ENGINE TEST PROGRAM

SAE International

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1 SCOPE
2 REFERENCES
  2.1 Applicable Documents
      2.1.1 SAE Publications
      2.1.2 ANSI Publications
      2.1.3 ASME Publications
      2.1.4 Applicable References
  2.2 Symbols
  2.3 Subscripts
  2.4 Acronyms
  2.5 Glossary of Terms
3 INTRODUCTION
4 MEASUREMENT UNCERTAINTY METHODOLOGY BACKGROUND
5 MEASUREMENT PRACTICES AND UNCERTAINTY ANALYSIS
  5.1 General Overview of the Measurement Uncertainty
      Process
  5.2 The Measurement Uncertainty Process for the Uniform
      Engine Test Program
      5.2.1 Definition of Defined Measurement Processes
      5.2.2 Elemental Error Assessment
      5.2.3 Measurement Uncertainty Components
      5.2.4 Performance Parameter Components
      5.2.5 Uncertainty
      5.2.6 Validation of the Uncertainty
      5.2.7 Interfacility Comparisons
  5.3 Summary
6 STATISTICAL ANALYSIS OF UETP RESULTS
  6.1 UETP Test Processes and Analysis
  6.2 AGARD's Concerns
  6.3 Statistical Methods
      6.3.1 Standard Error Estimate (SEE), (Random Uncertainty)
      6.3.2 Pooled Standard Error of Estimate
      6.3.3 Sample Size
      6.3.4 Systematic Uncertainty
  6.4 Analysis Procedure
      6.4.1 Selection of Curve-Fit Polynomial
      6.4.2 Explanation of Table and Plot Terms
7 COMPARISON OF PRETEST UNCERTAINTY ESTIMATES WITH POSTTEST
  ANALYSIS RESULTS
  7.1 Random Uncertainty
  7.2 Systematic Uncertainty
  7.3 Total Uncertainty
  7.4 Discussion
8 CONCLUSIONS
Appendix A - Uncertainty/Error Propagation
Appendix B - Summaries of Elemental Measurement Process
             Components and Practices
Appendix C - Tabular Presentation of UETP Pretest Uncertainty
             Results
Appendix D - Plots of UETP Test Data and Statistical Analysis
             Results
Appendix E - Determination of Posttest Interfacility Systematic
             Uncertainties

Abstract

Describes the systematic and random measurement uncertainties which may be expected when testing gas turbine engines in a range of different test facilities.