The history and statistical development of the new ASME-SAE-AIAA-ISOmeasurement uncertainty methodology

Abstract

A standard measurement uncertainty methodology has been adopted by the SAE,” 2 ’ 3 , ASME, 4 ’ 5 ’ 6 and AIAA 7 ’ 5 ’ 9 . The same standard has been recognized and adopted by ISA’°”, ISO 12 , USAF’ 3 and JANNAF’ 4 . This is remarkable after decades of striving to reach agreement. The objective of this paper is to document some of the history, statistical evaluation and significant contributions that led to this national and international consensus. The statistical Month Carlo simulations that led to selecting this methodology will he descrihed. It is hoped that the novice measurement uncertainty analyst will gain some understanding of the reasoning that supports the standard. Standard Methodology The ICRPG Handbook was presented at the 1969 SAE-ASME-AIAA Propulsion Conference 8 and received widespread acceptance. The propulsion community successfully applied the rocket methodology to gas turbines which inspired a contract from the USAF Applied Propulsion Laboratory to produce a similar handbook forjet engines. This document’ 3 was given worldwide distribution by the USAF after introduction at the 1972 SAE-AIAA-ASME Propulsion Conference 9 . It was widely used within the aerospace industry. 21 ’ 2~~ ’ 43 In 1980 the Instrument Society of America reprinted it as an ISA Handbook 10 . However, the fifth problem, the dispute over how to combine random and systematic errors to obtain an uncertainty continued to 6 ge through the seventies and even the authors were pessimistic about the prospects of settling the issue. The “great compromise” provided the solution. It is not the purpose of the paper to detail the methodology as that is available in the above references, particularly” 45 ” 2 . However, a brief summary may he helpful and is provided in Appendix A.

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