МЕТРОЛОГІЯ, КВАЛІМЕТРІЯ ТА КВАЛІМЕТРИЧНІ ВИМІРЮВАННЯ: ТЕОРІЯ І ПРАКТИКА
Journal Title: Вимірювальна техніка та метрологія - Year 2015, Vol 1, Issue 76
Abstract
In the article, the main issues of interrelation between qualimetry and metrology reviewed and analyzed. Qualimetry is a branch of science where research subject is product quality quantitative assessment and as an each new science it has some theoretical and methodological problems. Solving these problems, according to the authors, is possible only in a complex combination of quality control methodology and metrology. Metrology, the science of measurement and its application, has the strong scientific, practical and legal tools, which allows research in any field of knowledge. Analysis of the ways of solving these problems is the subject of this study. The authors propose to use the concept of “qualimetrical measurements” as one of the types of measurements in the theory and practice of quality control. That allows combine the methodology of qualimetry and metrology and significantly extend qualimetry opportunities in the reliability and accuracy of the product quality estimates. Qualimetrical measurements, by the authors definition, is indirect measurements of product quality level, the meaning of which can be obtained by the way of measurement results processing of its characteristics according to multidimensional scaling methodology. Product quality level is a relative characteristic of product quality grounding on the comparison of values of products quality assessed indexes and basic values of corresponding indexes. Generally, qualimetrical measurements as any other one consists of two principal stages: • carrying out the measuring experiment during which different characteristics (mechanical, dimensional, electric, magnetic, thermic and chemical composition etc.) of studied products are measured; • measuring experiment results processing during which the studied products quality Q is defined. This is the qualimetrical measurements results. Therefore, the mentioned above approach of qualimetrical measurements essence and purpose enables to treat them as one of the indirect measurements types and to use the main principles of measuring theory for their analysis. The procedure of qualimetrical measurements for measuring of product quality level is developed and its practical implementation described in this article and such tasks of research to achieve the work goal solved: • a synthesis of the product quality measure; • developing of the procedure of qualimetrical measurements; • a synthesis of the one-dimensional qualimetrical scale of product quality level; • a practical implementation of the qualimetrical measurements methodology on the example of the determining the quality level of natural gas as an energy source. The basis of any measurement is the comparison of measured value and measure which reproduce and (or) keeps one or more known values of a given quantity. Qualimetrical measurements specificity is absence of specific physical (material) quality measures of some products. Product quality virtual measure used for methodological providing of qualimetrical measurements procedure realization and their accuracy and quality assessment. Virtual measure is the theoretical analog of corresponding physical (material) measure of studied product and it’s the reflection of real physical (material) measure of current product quality is expressed by mathematical and program means. In this case, the product quality virtual measure is a weighted basic profile of product quality , formed from single relative weighted basic quality indexes , і =1,2,…,п, where n – number of product quality indexes, equal to the number of properties of the investigated product. To measure the quality level of the investigated product Q, namely for full implementation of qualimetric measurements procedures, it is necessary to compare the weighted estimated profile of product quality , formed from single relative weighted estimated quality indexes , with weighted basic profile , namely with virtual quality measure. To compare profiles of quality and is used the methodology of multidimensional scaling - one of the sections of mathematical statistics, the subject of research of which is data processing on pairwise similarities, connections and relationship between objects that are analyzed in order to present these objects in the form of points of some multidimensional space. In the case of statistic independent (non-correlated) single relative quality indexes for comparision profiles of quality and it should be used weighed Euclidean individual differences model. In the case of correlation between the single quality indexes to determine product quality level it should be used three-model multidimensional scaling model. In both cases it should be defined the absolute difference or deviation function П between profiles of quality and . On the basis of obtained deviations П the scale of product quality level Q determination can be build, and as result bigger numerical quality Q level value will correspond for higher product quality: Q = 1 –П or Q = (1 –П)100%. Thus, based on the methodology of qualimetrical measurements, developed in the article, the complex evaluation of the Natural Gas quality as an energy source was realized, in which were taking into account a ratio of the most important gas characteristics, such as caloric content, humidity, density, composition, availability and quantity of non-flammable and harmful components.
Authors and Affiliations
Василь Мотало, Андрій Мотало, Богдан Стадник
Keywords
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