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Standard Practice for Conducting Ruggedness TestsPřeložit název
NORMA vydána dne 1.6.2021
Označení normy: ASTM E1169-21
Datum vydání normy: 1.6.2021
Kód zboží: NS-1029459
Počet stran: 17
Přibližná hmotnost: 51 g (0.11 liber)
Země: Americká technická norma
Kategorie: Technické normy ASTM
foldover, fractional factorial design, half-normal plot, Plackett-Burman, ruggedness, screening design,, ICS Number Code 19.020 (Test conditions and procedures in general)
|Significance and Use|
4.1A ruggedness test is a special application of a statistically designed experiment that makes changes in the test method variables, called factors, and then calculates the subsequent effect of those changes upon the test results. Factors are features of the test method or of the laboratory environment that are known to vary across laboratories and are subject to control by the test method.
4.1.1Statistical design enables more efficient and cost-effective determination of the factor effects than would be achieved if separate experiments were carried out for each factor. The proposed designs are easy to use in developing the information needed for evaluating quantitative test methods.
4.2In ruggedness testing, the two levels (settings) for each factor are chosen to use moderate separations between the high and low settings. In general, if there is an underlying difference between the levels, then the size of effects will increase with increased separation between the high and low settings of the factors. A 4.3A ruggedness test is usually conducted within a single laboratory on uniform material, so that the effects of changing only the factors are measured. The results may then be used to assist in determining the degree of control required of factors described in the test method.
4.4Ruggedness testing should precede an interlaboratory (round robin) study to correct any deficiencies in the test method and may also be part of the validation phase of developing a standard test method as described in Guide E1488.
4.5This standard discusses design and analysis of ruggedness testing in Section 5 and contains an example of a basic eight run design. Some caution must be used in interpretation of results, since interaction effects may be present. These effects are present when a factor effect changes with the level of other factors in the experimental design. If it is thought that there may be interaction between variables then additional testing of the basic design is necessary. This is discussed in Section 6. In addition, Annex A3 presents estimates of precision of factor effects when run settings are replicated. An example of a twelve run design is shown in Appendix X1. Annex A1 and Annex A2 provide supplemental information.
1.1This practice covers conducting ruggedness tests. The purpose of a ruggedness test is to identify those factors that strongly influence the measurements provided by a specific test method and to estimate how closely those factors need to be controlled.
1.2This practice restricts itself to experimental designs with two levels per factor. The designs require the simultaneous change of the levels of all of the factors, thus permitting the determination of the effects of each of the factors on the measured results.
1.3The system of units for this practice is not specified. Dimensional quantities in the practice are presented only as illustrations of calculation methods. The examples are not binding on products or test methods treated.
1.4This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.5This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
|2. Referenced Documents|
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