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ASME PTC 19.1 TEST UNCERTAINTY PDF

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The edition of ASME PTC will be revised when the Society approves the issuance of the next edition. There will be no Addenda issued to ASME PTC. ASME PTC Test Uncertainty [ASME] on *FREE* shipping on qualifying offers. The scope of this Code is to specify procedures for . (Revision of ASME PTC ). Test Uncertainty. Performance Test Codes. AN AMERICAN NATIONAL STANDARD. Two Park Avenue • New York, NY.

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The statistical equations used to assess variations between tests are similar to those discussed in z para. In a sample of measurements, the degrees of freedom is the sample size N. For a uncerhainty frequency distribution, the random standard uncertainty of the sample mean, sX, can be used to define the probable interval about the sample mean that is expected to contain the population mean with a defined level of confidence.

H2O Nominal Value 0. Transactions of the ASME: Examples of error sources include Measurement uncertainty can also exist from imperfect calibration corrections, uncontrolled test interactions between a the test instrumentation conditions, measurement methods, environmental and the test media or b between the test article conditions, and data reduction techniques.

Standard statistical hypothesis testing may be used to evaluate the significance of the difference observed. In successive measurements of the parameter, uncertaonty values of these elemental random error sources change resulting in the random scatter evident in the successive measurements.

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Data from the loss coefficient test are summarized in Tables For this uncertainfy example, assuming that these are not correlated will elevate the estimated uncertainty in the test result. Other confidence levels may be used, if required.

The following simple expression for the combined standard uncertainty of a result applies in many cases: Once the questions to be answered have been clearly stated, it should be easy to decide upon the correct intervals. Typically, these larger data sets are taken in the early phases of an experimental program.

As can be seen from this diagram, the combina- tion of bT1, bT2, and bT1T2 is the largest contributor to the combined standard uncertainty, uR, and sP2 p 7. A correction factor must be applied that corrects between uninstalled to installed aircraft engine performance. Total error consists of two components: The relative lengths of the three intervals obtained in the preceding examples are compared in Fig.

ASME PTC 19.1-2005 试验不确定度 Test Uncertainty.pdf

For this example, the velocity is measured at 40 unique traverse points 10 traverse positions along 4 equally spaced radii corresponding to the z centroid of equal areas as shown in Fig. Several simplifying assumptions are made for this example: It is interest- w ing to note that the systematic standard uncertainty in z is less than the smallest estimate of systematic standard uncertainty for any of the flowmeters.

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One measurement will not give the true average value directly. Once evaluated, all of the ele- to contain the true value.

ASME PTC – Test Uncertainty

ASME does not take any position with respect to the validity of any patent rights asserted in connection with 19.1 items mentioned in this document, and does not undertake to insure anyone utilizing a standard against liability for. A-2 may be used to obtain a w better estimate of the true value than either of the individual measurements.

The results of these calculations are summarized in Table The partial derivatives for eq. The results of this analysis are summarized in Table The appa- ratus consists of a closed loop tube containing. This section provides an overview of how the measurement process should be defined.

Special tests had previously been conducted to determine if taking additional traverse points 20 along each of the 4 radii would result in a significant change in the measurement of the overall average velocity in the pipe, as computed using eq.

In many instances, the quantity measured varies in space, making the point measurement inadequate. Note that these values were obtained of a test result, uR. However, when a data set from the test. Example adapted from [9]: