| Transient Turbine Engine Modeling with Hardware-in-the-Loop Power Extraction (PREPRINT) |
Jul-2008 |
9 pages |
| Authors:
John McNichols; Michael A Boyd; J M Wolff; Philip R Owen; S D Phillips; Mark J Blackwelder; J Timothy; Michael W Corbett; Peter T Lamm; KRAUSE (P C) AND ASSOCIATES WEST LAFAYETTE IN
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 | Increasingly high aircraft power demands require that the interactions between an aircraft's electrical subsystem and the engine subsystem be considered in dynamic, system-level tests. Traditionally, system-level dynamics have only been captured in completely assembled aircraft systems. Component-level or subsystem-level optimization is no longer appropriate because highly interdependent dynamics between subsystems only become apparent during system-level analysis. In an effort to mitigate program risk, enable system-level optimization, and reduce the high ... |
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| A Careful Consideration of the Calibration Concept |
Jan 2001 |
10 pages |
| Authors:
S D Phillips; W T Estler; T Doiron; K R Eberhardt; M S Levenson; ARMY METROLOGY AND CALIBRATION CENTER REDSTONE ARSENAL AL METROLOGY DEVELOPMENT AND ENGINEERING DIV
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| This paper presents a detailed discussion of the technical aspects of the calibration process with emphasis on the definition of the measurand, the conditions under which the calibration results are valid, and the subsequent use of the calibration results in measurement uncertainty statements. The concepts of measurement uncertainty, error, systematic error, and reproducibility are also addressed as they pertain to the calibration process. |
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| Calculation of Measurement Uncertainty Using Prior Information |
Dec 1998 |
9 pages |
| Authors:
S D Phillips; W T Estler; M S Levenson; K R Eberhardt; NATIONAL INST OF STANDARDS AND TECHNOLOGY GAITHERSBURG MD
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| We describe the use of Bayesian inference to include prior information about the value of the measurand in the calculation of measurement uncertainty. Typical examples show this can, in effect, reduce the expanded uncertainty by up to 85 %. The application of the Bayesian approach to proving workpiece conformance to specification (as given by international standard ISO 14253-1) is presented and a procedure for increasing the conformance zone by modifying ... |
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| Results of the NIST National Ball Plate Round Robin |
Jan 1997 |
10 pages |
| Authors:
G W Caskey; S D Phillips; B R Borchardt; NATIONAL INST OF STANDARDS AND TECHNOLOGY GAITHERSBURG MD
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| This report examines the results of the ball plate round robin administered by NIST. The round robin was part of an effort to assess the current state of industry practices for measurements made using coordinate measuring machines. Measurements of a two-dimensional ball plate (240 mm by 240 mm) on 41 coordinate measuring machines were collected and analyzed. Typically, the deviations of the reported X and Y coordinates from the calibrated ... |
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