Browsing by Subject "defect"

Now showing 1 - 3 of 3

Access status: Open Access ,
Analysis of pumping unit reducers diagnostic algorithms by formalized methods
(Wydawnictwa AGH, 2012) Kopey, B. V.; Stefanyshyn, O. I.; Bednarz, S.
Diagnostic model of pumping unit reducer is designed for the construction and analysis of algorithms by diagnosing formalized methods. The using of the diagnostic model allows us to ease and formalize decisions on the diagnostic problem. For the synthesis of algorithm for diagnosing the functional-logical model has been selected, which allows to consider the links between individual elements and assemblies of the reducer by simple means and consider the impact of these items on measuring diagnostic features. For a more detailed study of processes occurring in the gearbox of pumping unit, and facilitate the development of its diagnostic model, a functional diagram of reducing gear was built. Diagnostic logic model will help to establish and classify defects in development, to determine the direction of their development and cause-effect relationship with other defects.
Access status: Open Access ,
Comparing deterministic and statistical approaches for predicting »short can« defects in aluminium beverage can production
(Wydawnictwa AGH, 2023) Baran, Wojciech; Regulski, Krzysztof; Kąc, Sławomir; Milenin, Andriy
In the production of beverage cans, »short can« defects in the form of material discontinuities can occur during the deep drawing of cylindrical thin-walled aluminium products. These defects have a significant impact on production efficiency and scrap generation, and their occurrence is influenced by material and process properties. To determine the main influence of material on defect occurrence, two approaches were used: deterministic analysis of mechanical properties and microstructure, as well as statistical processing of production data using decision tree models. The latter approach was found to be more efficient, and a numerical tool was developed based on this approach to predict and reduce defect occurrence in the production process.
Access status: Open Access ,
Local error structures and order conditions in terms of Lie elements for exponential splitting schemes
(2014) Auzinger, Winfried; Herfort, Wolfgang
We discuss the structure of the local error of exponential operator splitting methods. In particular, it is shown that the leading error term is a Lie element, i.e., a linear combination of higher-degree commutators of the given operators. This structural assertion can be used to formulate a simple algorithm for the automatic generation of a minimal set of polynomial equations representing the order conditions, for the general case as well as in symmetric settings.