3 edition of Measurement uncertainty within the uniform engine test programme found in the catalog.
Measurement uncertainty within the uniform engine test programme
North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development.
|Statement||edited by J.P.K. Vleghert.|
|Series||North Atlantic Treaty Organization. AGARDograph -- no. 307|
|The Physical Object|
|Pagination||63 p. :|
|Number of Pages||63|
The aim is to provide a practical, understandable and common way of measurement uncertainty calculations, mainly based on already existing quality control and validation data, according to the European accreditation guideline /12/, the Eurolab Technical Report No. 1 . Editor’s note: This is the third in a three-part series on measurement uncertainty. In this brief overview of measurement uncertainty, we have arrived at a value for use in an uncertainty budget. There are several ways to use that value and the budget that created it. First, it is an indicator of how exact a specific measurement process is.
The induction motor direct and indirect efficiency measurement method comparison from a collection of test data using Bland-Altman procedure is presented in . Overview. The validity of measurements made have little meaning unless the uncertainty of the test or calibration process is known. Many standards, including ISO/TS and ISO/IEC , require that the uncertainty of measurement be taken into account when performing measurement activities.
Measurement Uncertainty Class/Workshop. This class has been provided by Quametec since , instructed by James D Jenkins. This course is ideal for the training of anyone needing to meet the measurement uncertainty analysis and measurement quality management requirements associated with ISO/IEC and Z This course is presented in a manner which is suitable for entry level to . the result of a previous calibration. Calibration uncertainty thus becomes an uncertainty of conformity decision. In this study five years’ test and verification data of working standards such as non-automatic weighing instrument, weight measures, and volumetric measures were analyzed.
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Get this from a library. Measurement uncertainty within the uniform engine test programme: report of the Sub-Group on Uncertainty Assessment. [J P K Vleghert; North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development. Propulsion and Energetics Panel. Working Group Sub-Group on Uncertainty Assessment.
Often, a test is not a measurement: tests normally lead to a ‘yes/no’ answer or a ‘pass/fail’ result. (However, measurements may be part of the process leading up to a test result.) 2 Uncertainty of measurement What is uncertainty of measurement.
The uncertainty of a measurement tells us something about its Size: KB. errors and total uncertainty of measured turbojet engine performance parame- ters.
The engine tests were conducted as part of the Uniform Engine Test Pro- gram which was sponsored by the Advisory Group for Aerospace Research and Development (AGARD). With the same engines, support hardware, and instrumenta-File Size: 1MB.
The Advisory Report summarises the results of the Propulsion and Energetics Panel Working Group The Group was in opetation and performed test runs of two J 57 turbojet engines at eight different facilities for ground-level and altitude tests, in five different nations.
In some cases the uncertainty in a measurement or test result may be considered to be so small as to not merit formal evaluation. However, without a formal estimate, this consideration remains intuitive and, when challenged, a convincing response will not be possible.
The results of some types of test are subject to large uncertainty File Size: KB. Fortunately, I found this book, An Introduction to Uncertainty in Measurement: Using the GUM in my university library and it has been a tremendous help.
The authors do a good job at walking the reader through the calculations needed for GUM and at providing examples. I found the book easy to read and easy to by: It is a parameter, associated with the result of a measurement (e.g. a calibration or test) that defines the range of the values that could reasonably be attributed to the measured quantity.
When uncertainty is evaluated and reported in a specified way, it indicates the level of confidence that the value lies within the range defined by the. Measurement uncertainty has had a long history in the standards community1.
According to the ‘Guide to the expression of uncertainty in measurement’ (GUM) 2, uncertainty of a measurement result is a parameter that characterises the spread of values that could reasonably be attributed to the ‘measurand’ 3 (i.e.
the quantity being measured).File Size: 37KB. The text presents the basics of the measurement uncertainty model, non-symmetrical systematic standard uncertainties, random standard uncertainties, the use of correlation, curve-fitting problems, and probability plotting, combining results from different test methods, calibration errors, and uncertainty propagation for both independent and 1/5(1).
Uncertainty of Measurement Page 1 of 4 UNCERTAINTY OF MEASUREMENT – CALIBRATION AND TESTING PROGRAMME Pre-course work on a calculation of mean and standard deviation, with full instructions (with delegates using their own calculators) will be sent out to all delegates approximately one week before the course date.
Contributors of test uncertainty 75 Test uncertainty contributors for CMM 75 Test uncertainty contributor for micrometer and gage block 78 Comparison between test U, calibration and task specific U 83 Comparison of CMM testing data 86 Simulation using PUNDIT 87 Experiment results 94 Test Uncertainty File Size: 1MB.
19 MEASUREMENT UNCERTAINTY Overview This chapter discusses the evaluation and reporting of measurement uncertainty. Laboratory measurements always involve uncertainty, which must be considered when analytical results are used as part of a basis for making decisions. Every measured result reported by a laboratory.
For the ESC emission measurement it is possible to use a passive dynamometer, while the transient test requires an active dynamometer. Uncertainty of measurement is an important matter to get accurate emission data, but there are not many published papers about a method for its calculation related to diesel engine by: 2.
The quality of the measurement result, its accuracy, is characterized by measurement uncertainty (or simply uncertainty), which defines an interval around the measured value C MEASURED, where the true value C TRUE lies with some probability.
The measurement uncertainty U itself is the half-width of that interval and is always non-negative. Estimating Measurement Uncertainty is a basic activity in measurement laboratories and on production lines in modern industry.
ISOQS and ISO/TS have put increased focus on this issue with new, specific requirements. Accounting for the measurement uncertainty is also a prerequisite for a calibration laboratory to gain. Estimation of Measurement Uncertainty. If required (e.g. measurement results are close to limit value or the impact of major errors in measurement chains must be judged) measurement uncertainty of test results shall be estimated.
Therefore it is necessary to specify combined standard uncertainty u c(y i). Practical guidance. Brief summary: Like the individual values, the mean value calculated from them is also a random quantity. If the individual values are distributed according to the Normal distribution then the mean value calculated from them is distributed according to the Student distribution (also called as t-distribution).
The properties of the t-distribution compared to the Normal distribution are explained. For a single test result: Uncertainty of Measurement is used to indicate the confidence we have that the reported figure is correct. If the uncertainty of measurement is calculated as CV% x 2: There is a 95% chance that the true result lies within a range covered by result number ±.
Laboratory managers, metrology managers, quality managers, process, product, design and test engineers, calibration personnel, test personnel, and those who wish to gain an understanding of calculating measurement uncertainty will find this program.
Evaluation of measurement data – Supplement 1 to the "Guide to the expression of uncertainty in measurement" – Propagation of distributions using a Monte Carlo method JCGM Evaluation of measurement data – Supplement 2 to the "Guide to the expression of uncertainty in measurement" – Extension to any number of output quantities.
G - A2LA Guide for Estimation of Measurement Uncertainty in Testing G - Guidance on Scopes of Accreditation for Telecommunication Certification Bodies G - Guidelines for Estimating Uncertainty for Microbiological Counting Methods.Quiz & Worksheet - Scientific Measurements & Uncertainty.
Try it risk-free for 30 days. Choose an answer and hit 'next'. You will receive your score and answers at the end. question 1 of 3. How.The estimated measurement uncertainty provides a level of confidence in the experimental results, and enables the comparison of data, both between different laboratories and between different methods.