Wyniki wyszukiwania - BazTech

1

Modification of the adhesive force by changing the radial reaction on vehicle wheels

Jilek Petr, Krmela Jan, Berg Jan

Transport Problems

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2021

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T. 16, z. 1

179--186

EN

This article deals with the possibilities of adhesion force changes of a road vehicle. The authors present the possibilities of reducing the adhesion force of road vehicles and, at the same time, present their own system for changing the radial reaction of the vehicle wheels. This system removes the disadvantages of a commercially available SkidCar system. A representative road test is chosen in the article to determine the stability in a straight-line drive. Furthermore, the authors report the courses of characteristic parameters describing the behavior of a vehicle for driving a conventional car on a sliding surface and compared to the 50 % radial reaction of a vehicle driven with the SlideWheel on dry asphalt. It is clear from the measured runs that it is possible to change the adhesion force by changing the adhesion weight transmitted by the vehicle wheels. The use of the proposed SlideWheel system is possible for the purpose of verifying vehicle stability, while improving the driver's ability to operate the vehicle under reduced-adhesion conditions. The main goal of this paper is to design a system for reducing the adhesive force in an experimental car and perform experimental measurements.

2

Analysis of Inorganic Binder Bridges Destruction after Thermal Load

Vaskova I., Conev M.

Archives of Foundry Engineering

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2019

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iss. 2

25--28

EN

Recently, the use of inorganic binders cured by heat as a progressive technology for large scale production of cores is widely discussed topic in aluminium foundries. As practical experiences show, knock-out properties of inorganic binders were significantly increased, although they cannot overcome organic based binder systems. This paper contains information about hot curing processes based on alkali silicate and geopolymer binder systems for core making. Main differences between hot cured geopolymers and hot cured alkali silicate based inorganic binders are discussed. Theory of geopolymer binder states, that binder bridge destruction is mainly of adhesive character. The main aim of this research paper was to examine binder bridge destruction of alkali silicate and geopolymer binder systems. In order to fulfil this objective, sample parts were submitted to defined thermal load, broken and by using SEM analysis, binder bridge destruction mechanism was observed. Results showed that geopolymer binder system examined within this investigation does not have mainly adhesive destruction of binder bridges, however the ratio of adhesive-cohesive to cohesive destruction is higher than by use of alkali silicate based binder systems, therefore better knock-out properties can be expected.

3

Effect of moisture content in coal dust on filtration and cleaning performance of filters

Li J., Li S., Zhou F.

Physicochemical Problems of Mineral Processing

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2016

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Vol. 52, iss. 1

365--379

EN

A large amount of fugitive coal dust is generated during the mining, transportation, and processing of coal. The moisture content of the coal dust has a significant influence on the dust collection performance of filters, although relatively few studies on this phenomenon exist. This study deals with six groups of coal dust samples with moisture contents ranging from 0 to 12 wt.% and tested the pressure drop as the coal dust was deposited onto three different types of filters. The specific resistance, compression coefficient, and porosity of the coal dust cake were analyzed, and the cake/filter adhesive force was tested using the reverse flow cleaning method. This research demonstrates that the influence of the moisture content on the specific resistance, compression coefficient, and porosity of the coal dust cake can be divided into two phases (according to the critical moisture content of 4 wt.%): first, as the moisture content increased from 0 to 4 wt.%, the cake resistance and compression coefficient increased and the cake porosity decreased; and second, as the moisture content increased from 4 to 12 wt.%, the cake resistance and compression coefficient decreased and the porosity increased. The coated and repellent filters possessed a lower adhesive force on the coal dust cake than the conventional filter. The comparison of all three of the filters revealed that the adhesive force between the repellent filter and the dust cake was the least sensitive to the moisture content.

4

Measurement of the Adhesive Force for Selected Yarns Joined with the Use of the Pneumatic Linking Technique

Swaczyna P.

Fibres & Textiles in Eastern Europe

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2013

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Vol. 21, no. 2 (98)

56--60

EN

The article presents an idea of measuring the adhesive force – a force binding together the components of yarn pneumatically linked, describes the measuring system designed and partially constructed at the Textile Research Institute (IW), discusses the conditions of the measurement and presents exemplary results of the adhesive force indicator, determined specially for studies on the structure and properties of yarns pneumatically linked, composed of staple fibres.

PL

W publikacji zaprezentowano ideę pomiaru sił sczepliwości – czyli sił z jakimi komponenty przędzy złączonej pneumatycznie są z sobą związane, omówiono system pomiarowy do tego celu zaprojektowany i częściowo wykonany w IW, omówiono warunki pomiaru oraz przedstawiono przykładowe wyniki badań wskaźnika siły sczepliwości, który opracowany został specjalnie do badań nad strukturą i właściwościami przędz sczepianych pneumatycznie, których składowymi są przędze z włókien odcinkowych.

5

Adhesive forces at a solid-liquid interface

Pochyly F., Fialova S., Rinka L.

Zeszyty Naukowe Politechniki Świętokrzyskiej. Nauki Techniczne

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2008

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Z. 10, Vol. 1

245-252

EN

The contribution subject is the adhesive forces at the solid-liquid interface study. The adhesive forces effect is characterized by so called surface energy. On the Victor Kaplan department of fluid engineering there is installed a special device for the surface energy measurement. By this device usage will be presented the surface energy measurement results of different surfaces used in the hydraulics and aeronautics. On the result base will be derived the dissipative function rate of these materials in reference to glass. This rate represents the hydraulic losses. Moreover it'll be set the new boundary condition for the partial slip (partial wettable) surfaces.

6

Wpływ struktury i wybranych właściwości technologicznych na wytrzymałość adhezyjną gazotermicznych powłok ochronnych z udziałem faz międzymetalicznych z układu Fe-Al.

Senderowski C., Bojar Z., Durejko T., Zasada D.

Inżynieria Materiałowa

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1999

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R. XX, nr 5

356-358

PL

W pracy przedstawiono ocenę morfologii mikrostruktury powłok gazodetonacyjnych otrzymanych ze stopowych proszków samorozpadowych z układu Fe-Al nanoszonych na podłoże ze stali 45 przy optymalnie dobranym poziomie energii detonacji. określono wpływ rozkładu naprężeń własnych i mikrotwardości na wytrzymałość adhezyjną układu powłoka-podłoże mierzoną metodą na zarysowanie. Stwierdzono, że warstwowa struktura powłok bazująca na wtórnym roztworze stałym fazy FeAl o sieci B2, daje szerokie możliwości zmiany ich składu chemicznego przy zachowaniu wysokiego poziomu umocnienia i dobrej przyczepności powłok.

EN

An evaluation of microstructure morphology of gas detonation sprayed coatings obtained with self-desintegrated Fe-Al type powders sprayed with optimal energy of detonation over a 45-type steel substrate was presented in this paper. An influence of residual stresses and microhardness distribution on coating and substrate adhesion measured with a scratch test system method, has been described. It has been found, that layered structure of coating based on FeAl secondary solid solutions gives a wide range of possibilities of chemical composition changes. It has a influence for a high level of hardening and a good adhesion of coating.