Wyniki wyszukiwania - BazTech

1

Credit Risk Management Using Automatic Machine Learning

Gaweł Bartłomiej, Paliński Andrzej

Decision Making in Manufacturing and Services

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2020

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Vol. 14, no. 2

193--208

EN

The article presents the basic techniques of data mining implemented in typical commercial software. They were used to assess the risk of credit card debt repayment. The article assesses the quality of classification models derived from data mining techniques and compares their results with the traditional approach using a logit model to assess credit risk. It turns out that data mining models provide similar accuracy of classification compared to the logit model, but they require much less work and facilitate the automation of the process of building scoring models.

2

Metody i urządzenie do badania tarcia i zużywania kół zębatych walcowych w układzie mocy krążącej

Tuszyński W., Kalbarczyk M., Hoyos de la Garza E., Mydlarz J., Kiser B., Handzlik P.

Tribologia

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2015

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nr 1

121--135

PL

Określenie wpływu nowego rodzaju oleju smarowego (np. ekologicznego) czy nowego sposobu modyfikacji powierzchni zęba (np. poprzez naniesienie cienkiej, twardej powłoki niskotarciowej) na trwałość kół zębatych jest możliwe jedynie poprzez zastosowanie badań eksperymentalnych. W tym celu w Zakładzie Tribologii ITeE – PIB w Radomiu opracowano urządzenie T-12UF do badania tarcia i zużycia kół zębatych walcowych w układzie mocy krążącej. Urządzenie pozwala na badanie trzech form zużywania: zacierania, pittingu i mikropittingu. W artykule przedstawiono urządzenie T-12UM będące zmodyfikowaną wersją urządzenia T-12UF. Dla celów wdrożenia urządzenia w jednej z krajowych uczelni wyższych niezbędne było jego wzorcowanie z użyciem olejów referencyjnych o skrajnie różnych właściwościach przeciwzatarciowych – tzw. olejów „Low” i „High”. Wzorcowania dokonano dla dwóch metod badawczych procesu zacierania. W badaniu użyto czterech olejów referencyjnych – po dwa („Low” i „High”) dla obu metod. W czasie wzorcowania dokonano próby identyfikacji zacierania, stosując metodę pomiaru momentu sił tarcia. Stwierdzono, że uzyskane wyniki wzorcowania są poprawne, co wskazuje na właściwe wykonywanie badań oraz prawidłowość pracy urządzenia.

EN

Finding the effect of a new type of a lubricating oil (e.g. ecological one) or a new way of the tooth flank modification (e.g. by deposition of a thin, low-friction coating) on the life of gears is possible only experimentally. For that purpose, at the Tribology Department of the Institute for Sustainable Technologies in Radom (ITeE – PIB), a new test rig, denoted as T-12UF, has been developed. It is intended for the back-to-back testing of the friction and wear of spur gears. Three dangerous forms of wear can be tested: scuffing/scoring, pitting, and micro pitting. In the paper, a modified version of the T-12UF test rig is presented, namely the test rig denoted as T-12UM. For the purpose of implementation in a lab of one of the domestic technical universities, the new test rig needed to be validated using reference oils having extremely different extreme-pressure (EP) properties – oils called “Low” and “High.” Two gear scuffing test methods were used. Four reference oils (two of every “Low” and “High”) for each test method were employed. During the validation, the authors checked if it is possible to identify the appearance of scuffing/scoring by monitoring the friction torque. The obtained results of the validation are as expected, which indicates that the new test rig runs properly and the scuffing test methods are realised correctly.

3

Make Or Buy - poszukiwanie kompromisu w zarządzaniu flotą pojazdów taboru transportowego

Odlanicka-Poczobutt M., Kulińska E.

Logistyka

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2015

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nr 6

818--827, CD

PL

Strategia transportowa, stanowiąca dla wielu przedsiębiorstw bardzo istotny element w planie dystrybucji, obejmuje takie elementy decyzyjne jak dostawy bezpośrednie lub konieczność odbioru przez klienta, typ wykorzystywanych środków transportowych, a często również wybór własnego lub obcego środka transportu. Ze względu na wagę tego wyboru dla firm działających na rynku piwowarskim - celem artykułu było porównanie wykorzystania floty własnej z taborem obcym w transporcie wyrobów piwowarskich z punktu widzenia czynników kosztowych oraz jakościowych z zastosowaniem metody Make Or Buy (MoB). W artykule dokonano oceny wskaźnikowej wyboru transportu własnego i obcego oraz oceny jakościowej usługi transportowej metodą scoring.

EN

Transportation strategy, which constitutes a very important element of the distribution plan for many companies, includes such the decision-making components as delivery or the need for direct reception by the customer, the type of used vehicles and often also a selection of their own or third party transport. Due to the importance of this choice for companies operating in the beer market - the aim of the article was to compare the use of its own or third party transport from the point of view of cost and qualitative factors by using method Make Or Buy (MOB). In the article the selected indicator of own and third party transport and transport service quality evaluation were assessed with scoring method.

4

A new scuffing shock test method for the determination of the resistance to scuffing of coated gears

Tuszynski W., Michalczewski R., Szczerek M., Kalbarczyk M.

Archives of Civil and Mechanical Engineering

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2012

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Vol. 12, no. 4

436--445

EN

An improvement in the scuffing resistance of toothed gears is achievable by e.g. the deposition of thin, hard coatings onto the gear teeth. However, the testing of the scuffing resistance of coated gears requires the application of specialised test methods. This paper presents a new test method, designed by the authors, called “gear scuffing shock test for coatings”. This method is based on the test method denoted as FZG S-A10/16,6R/110 developed at the Technical University of Munich. Because the FZG test method is dedicated exclusively to lubricating oils, its application for testing coated gears required introducing significant modifications. The developed method has been verified during the testing of the scuffing resistance of gears coated with the low-friction a-C:H:W coating and composite low-friction MoS2/Ti coating. Various material combinations were tested: coating–coating (both gears coated), coating-steel, steel-coating, and for reference steel–steel (both gears uncoated). Mineral, automotive gear oil of API GL-5 performance level, and SAE 80W-90-viscosity grade was used for lubrication. It has been shown that this test method can be successfully applicable to test the scuffing resistance of coated gears - it has a resolution good enough to differentiate between the tested material combinations.

5

Friction and wear of diffusion MoS2 solid lubricant coatings

Kovalev E., Ignatiev M., Leshchynsky V., Wiśniewska-Weinert H.

Problemy Eksploatacji

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2005

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nr 2

171--179

EN

The main objective of the presented research is an analysis of tribological properties of multilayered MoS2 solid lubricant coatings produced by diffusion synthesis. These coatings are applied to provide high serviceability of friction assemblies in air, helium environment and vacuum in the temperature range 300-973 K. The following configurations were used for wear tests: disk-on-disk with one annular ledge, disk-on-disk with three annular ledges and pin-on-disk.

PL

Głównym celem badań była analiza właściwości tribologicznych wielo-warstwowych powłok smarujących MoS2 wytwarzanych w procesie syntezy dyfuzyjnej. Powłoki takie stosowane są dla zapewnienia wysokiej jakości pracy węzłów tarcia w środowisku powietrza, helu i w próżni, w temperaturze od 300 do 973 K. W badaniach zużycia użyto następujących konfiguracji elementów testowych: tarcza-tarcza z jednym pierścieniowym występem tarcza-tarcza z trzema pierścieniowymi występami oraz trzpień-tarcza.

6

Establishment of a new class of wear: adhesion initiated catastrophic wear

Markov D., Kelly D.

International Journal of Applied Mechanics and Engineering

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2002

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Vol. 7, no 3

887-901

EN

The nucleation mechanisms and early stages of four types of catastrophic wear (cw), which can be identified as adhesion-initiated (ai) are considered. Close connections are established: a) between two low-energy types of AICW and a disclination mode of plastic deformation and between two high-energy types of AICW and an amorphous mode of plastic deformation, b) between the incidence of either type of low-energy aicw and the hardness of an AICW seed domain relative to that of the friction surfaces, and c) between the onset of AICW and a competitive stripping and reformation of interlayers. Hypothesis on generation and transfer of energy and heat at microlevel (in process of movement of dislocations and disclinations) is developed as a base of amorphous deformation. Attention is drawn to a need for further consideration of terminology in this field.