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SAE AIR4979 Revision A, May 1, 2012
Estimation of Measurement Uncertainty in Engine Tests Based on NATO AGARD
Uniform Engine Test Program
Description / Abstract:
The primary objective of this document is to describe the systematic
and random measurement
uncertainties which may be expected when testing gas turbine engines
in a range of different test
facilities. The documentation covers a "traditional" method for
estimating pretest uncertainties
and a "new" method for computing and comparing posttest uncertainties.
To determine these posttest
uncertainties, data generated during the AGARD Uniform Engine Test
Program (UETP) were analyzed and
compared to the pretest estimates.
The proposed procedure provides a mechanism for determining the expected accuracy of test results obtained from facilities which were not previously cross calibrated. Furthermore, the method can be used to assist in making cost-effective management decisions on the level of validation/cross calibration necessary when bringing a test facility on line.
This document is also intended to act as a guide for improving uncertainty analyses in a broad spectrum of related industries. Measurement uncertainty and measurement system approaches and practices for the UETP are presented in a systematic format. Readers can use these uncertainty approaches and practices for comparison to their own measurement systems.
The approach chosen was to analyze three of the UETP test conditions at eight test facilities along with the individual measurement system approaches and practices. The test program provided a wide range of performance measurements and corresponding pretest uncertainty estimates encompassing a variety of test and measurement approaches and practices. Included in the analysis are the basic gas turbine performance measurements of temperature, pressure, airflow, fuel flow, area, speed, thrust, and typical performance parameter functions and associated uncertainty estimates.
The proposed procedure provides a mechanism for determining the expected accuracy of test results obtained from facilities which were not previously cross calibrated. Furthermore, the method can be used to assist in making cost-effective management decisions on the level of validation/cross calibration necessary when bringing a test facility on line.
This document is also intended to act as a guide for improving uncertainty analyses in a broad spectrum of related industries. Measurement uncertainty and measurement system approaches and practices for the UETP are presented in a systematic format. Readers can use these uncertainty approaches and practices for comparison to their own measurement systems.
The approach chosen was to analyze three of the UETP test conditions at eight test facilities along with the individual measurement system approaches and practices. The test program provided a wide range of performance measurements and corresponding pretest uncertainty estimates encompassing a variety of test and measurement approaches and practices. Included in the analysis are the basic gas turbine performance measurements of temperature, pressure, airflow, fuel flow, area, speed, thrust, and typical performance parameter functions and associated uncertainty estimates.
SAE AIR4979 Revision A, May 1, 2012
Estimation of Measurement Uncertainty in Engine Tests Based on NATO AGARD
Uniform Engine Test Program