Temat: wear friction - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Application of vibroacoustic signal to diagnose disck braking system
Autorzy:: Sawczuk, W.
Powiązania:: https://bibliotekanauki.pl/articles/244459.pdf
Data publikacji:: 2011
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: disc brake
wear of friction pad
vibration signal
amplitude characteristics
frequency characteristics
Opis:: Attempt to raise train speed involves application of greater braking power i.e. braking systems rapidly absorbing and dispersing stored heat energy. To maintain high efficiency of braking system in the whole operational process, it is necessary to control the friction set: brake and pad before reaching limitary wear particularly of friction pads. Stable and constant - in the whole speed range- coefficient of friction "mi" and realization of greater pad's pressures to the disc because of better conditions of warmth offtaking generated during braking into the athmoshere are basic advantages of disc brake systems [8]. Few disadvantages of disc brake include a lack of possibility of controlling the condition of the friction set: brake and pad in the whole operation time. It is particularly observable in rail cars, where disc brakes are mounted on the axle of the axle set between the wheels. To check the wear of friction pads and brake discs it is necessary to apply inspection channel to carry out inspections, and to carry out replacement of friction parts in case they reach their limitary wear. The purpose of this research is to apply vibration signal of pad calipers to assess the wear of friction pads of disc brake by defining characteristics of time, amplitude and selected frequency characteristics during tests at internal brake station.
Źródło:: Journal of KONES; 2011, 18, 1; 525-534
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Wear in friction brakes Wear in friction brakes
Autorzy:: Skorupka, Z.
Powiązania:: https://bibliotekanauki.pl/articles/243767.pdf
Data publikacji:: 2016
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: wear
wear testing
brakes
friction pair
friction material tests
full-scale brake tests
Opis:: Parameters of friction systems decline in time by the process of wear. In friction brakes, the wear phenomenon is much more visible than in other friction systems. Wear itself is on one hand not desirable because of need for brake system parts replacement but sometimes is needed due to regeneration of the friction area which is damaged for example by temperature or aggressive ambient conditions. Wear can be fatal or catastrophic for the friction brake, leading to heavy damage or even to permanent loss of braking capability during operation. As the brake is one of the crucial safety systems in both aviation and road vehicles, it is necessary to know if and how wear will be present in friction brake system before the brake is allowed to be installed in the vehicle, especially one that carries people. Wear can be estimated via numerical methods for well-known brakes (i.e. materials) or it has to be tested using laboratory methods in order to check and prove or deny initial design assumptions. In this paper, the author describes the phenomenon of friction brake wear and laboratory-testing methods of friction materials wear using brake model test stand for aviation brake friction materials certification testing located in Institute of Aviation Landing Gear Laboratory. Author also presents sample data from aviation brakes materials testing in order to show how wear can affect friction brake performance and durability.
Źródło:: Journal of KONES; 2016, 23, 2; 325-332
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Tribological properties of surface layer with boron
Autorzy:: Lubas, J.
Powiązania:: https://bibliotekanauki.pl/articles/242091.pdf
Data publikacji:: 2009
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: wear
sliding friction
surface treatment
boron
Opis:: The aim of the present work is to determine the influence of technologically produced boron surface layers on the friction parameters in the sliding pairs under the conditions of mixed friction. The tribological evaluation included ion nitrided, pack borided, laser borided, quenched and tempered surface layers and TiB2 coating deposited on 38CrAlMo5-10, 46Cr2 and 30MnB4 steels. Modified surface layers of annular samples were matched under test conditions with counter-sample made from AlSn20 bearing alloy. Tested sliding pairs were lubricated 15 W/40 Lotos mineral engine oil. The tribological tests were conducted on a T-05 block on ring tester. The applied steel surface layer modification with boron allow creating surface layers with pre-determined tribological characteristics reąuired for the elements of kinematic pairs operating in the conditions of sliding friction. Pack boronizing reduces the friction coefficient during the start-up of the frictional pair and the maximum start-up resistance level is similar to the levels of pairs with nitrided surface layers. Paper present comparison between surface roughness of annular sample and countersample before and after test, influence of surface treatment annular sample on change of friction coefficient vs. rotation speed and load, influence of surface treatment annular sample on moment of friction in function load of kinematics pair, influence of surface treatment annular sample on friction forces and temperature depending on load, as well as influence of surface treatment annular sample on wear of AlSn20 bearing alloy under various load conditions.
Źródło:: Journal of KONES; 2009, 16, 3; 213-221
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: The preliminary research of the influence of grease microcontainers made on the surface of the slide association on the vibration signal recorded for this association
Autorzy:: Boruta, G.
Napadłek, W.
Powiązania:: https://bibliotekanauki.pl/articles/243691.pdf
Data publikacji:: 2018
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: vibration
slide association
friction
wear
grease microcontainers
Opis:: There is shown the construction of an elaborated test stand for the test research of sliding friction associations. The following properties of tested friction associations are described: type (chemical composition) and hardening of applied materials, as well as the results of the analysis of topography of their collaborating surfaces (base material and then after creating grease microcontainers in it). The methodology and the range of performed researches are described. The researches were conducted using the accelerometer A0760GP and the industrial measurement device Emerson CSI 2130. On the basis of recorded vibration signals, their amplitude spectra were determined. These spectra were being compared and analysed in reference to the possibilities of application of measurements of vibration signals to indication of the process of association wear. It was found that the process of wear of the tested sliding association without lubrication from grease microcontainers is visible as the change of form of vibration signals recorded for this association as even over-a-dozen-fold changes in the value of amplitudes of some special harmonic components of those signals, especially high-frequency components within the analysed range of frequencies. It was also found that the application of the grease microcontainers on the surface on which rollers slide (not roll) allowed to acquire a significant reduction of the process of wear of the tested slide association, showed by the slower pace of growth of the value of all harmonic components, especially high-frequency components within the analysed range of frequencies. At the end there were provided directions of further researches.
Źródło:: Journal of KONES; 2018, 25, 2; 59-67
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: The application of CrN and TiN coatings in slide bearing kinematic coupling pin surface layer modification processes
Autorzy:: Lubas, J.
Powiązania:: https://bibliotekanauki.pl/articles/244165.pdf
Data publikacji:: 2008
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: TiN
CrN
wear
sliding friction
surface treatment
Opis:: This work presents the results of tribological stand tests of slide bearings with pins modified with CrN and TiN coatings and pins with a TiN-steel 46Cr2 and CrN-steel 46Cr2 ,,ring" structure. The ,,rin" structure samples features materials with different tribological properties in the form of rings on the pin slide surface. Such a structure is obtained when covering the 46Cr2 steel pin base with a discrete layer of TiN or CrN, using the PVD method. The stand tests of frictional couplings have been performed for the frictional kinematic coupling pin with modified surface layer and CuPb30 and AlSn20 alloy bearing liner slice. During the tests the tribological couplings were lubricated with Castrol magnatec engine oil (5W/40). The tests were performed on a T-05 tribological tester. The test results demonstrated the tribological advantageous using the "ring" structure samples in the frictional couplings. The tests demonstrated that the friction forces and the bearing material quantity wear were the least for couplings with CrN steel, 46Cr2 and nitrogen hardening, and the largest for TiN pin couplings. Modification of the CrN pin surface layer has a beneficial impact on reducing frictional resistance, and temperature reduction in the friction area as well as reduction in bearing alloy wear.
Źródło:: Journal of KONES; 2008, 15, 2; 263-267
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Tribological properties of sliding pairs with surface layer containing boron under mixed friction conditions
Autorzy:: Lubas, J.
Powiązania:: https://bibliotekanauki.pl/articles/242626.pdf
Data publikacji:: 2013
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: surface treatment
wear
sliding friction
boron
bearing alloy
Opis:: The aim of the present work is to determine the influence of surface layers containing boron on the friction parameters in sliding pairs under mixed friction conditions. The tribological evaluation included three production methods of surface layers with boron; pack boronizing, laser boronizing, and TiB2 coating deposited on 46Cr2 steel. Modified surface layers of ring specimens with 46Cr2 steel were matched under test conditions with a counterpart made from AlSn20 bearing alloy. Tested sliding pairs were lubricated with 5W/40 Lotos synthetic engine oil. The applied modification technologies of the surface layer of steel allowed for obtaining construction materials with predetermined tribological characteristics required for the elements of sliding pairs working undermixed friction conditions. The results showed differences in the wear of bearing alloy, as the effect of the interaction between the cooperating surface layers and of the physiochemical changes of their surfaces, induced by external forces. The TiB2 coating generated the highest friction resistance and bearing alloy wear. The pack borided surface layer reduces the friction coefficient, the moment during the start-up of the frictional pair and the wear of the bearing material. The analysis of the surface layer indicated that the content of aluminum on pack borided ring specimens reached 21%, and on the TiB2 coating, it exceeded 8%.
Źródło:: Journal of KONES; 2013, 20, 1; 185-192
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Possibility of assessment of elements interaction dynamics change in frictional contact with triboelectrical effects used
Możliwość oceny przebiegu współpracy elementów tworzących skojarzenie cierne z wykorzystaniem zjawisk triboelektrycznych
Autorzy:: Cypko, E.
Kałdoński, T.
Powiązania:: https://bibliotekanauki.pl/articles/243191.pdf
Data publikacji:: 2007
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: skojarzenie cierne
tarcie
zużycie
zjawiska triboelektryczne
frictional contact
friction
wear
triboelectrical effects
Opis:: In the paper are presented results of triboelectrical effects investigations occurring during frictional process of metal elements. In non-lubricated contacts triboelectrical effects, are observed as "friction microcurrents". It is possible to discriminate three phases of generation. In the first phase of interaction value increase of "friction microcurrent" is proportionally low. This phase meets so called running-in period, when active contact surface of interaction elements is increase. In the second phase, after increased of contact surface, decreased of resistance and increased of electrons energy, value intensely increases. In the third phase, state of thermic equilibrium forms for accept investigation conditions and "friction microcurrents" and has maximal, quasi-stabilized value. In lubricated contacts triboelectrical effects, are observed as "generated potential difference". It is possible to discriminate three phases of generation. The first phase measured from moment of start elements assessment interaction to moment of start potential difference generated, says about ability of tribological system to forming of oil wedge. The second phase says about intensity of phisico-chemical processes, proceed at surface layers of elements. The third phase says about stabilisation tribological processes in frictional contact (running-in process was finished) and frictional contact can be full load for assume conditions of interaction.
W referacie przedstawiono wyniki badań zjawisk triboelektrycznych, towarzyszących procesowi tarcia elementów metalowych W skojarzeniach niesmarowanych zjawiska tribologiczne obserwowane są jako "mikroprądy tarcia". Wyróżnić można trzy fazy generowania. W pierwszej fazie współpracy narastanie wartości jest stosunkowo niewielkie. Faza ta odpowiada tzw. okresowi docierania, w trakcie której zwiększa się powierzchnia czynna styku współpracujących elementów. W fazie drugiej, po zwiększeniu powierzchni styku i spadku rezystancji oraz zwiększeniu energii elektronów wartość intensywnie rośnie. W fazie trzeciej następuje stan równowagi termicznej dla zadanych warunków badań a "mikroprądy tarcia" i osiąga wartość maksymalną, ąuasi-ustaloną. W skojarzeniach smarowanych zjawiska tribologiczne obserwowane są jako "generowana różnica potencjałów". Wyróżnić można trzy okresy generowania. Okres pierwszy mierzony od chwili rozpoczęcia współpracy elementów skojarzenia do chwili powstania generowanej różnicy potencjałów, świadczy o zdolności układu tribologicznego do utworzenia klina smarnego. Okres drugi do osiągnięcia maksymalnej wartości GRP, świadczy o intensywności procesów fizyko-chemicznych, zachodzących na powierzchniach elementów. Okres trzeci informuje o stabilizacji procesów tribologicznych w węźle tarcia, to jest kiedy nastąpiło pełne dotarcie elementów a skojarzenie osiągnęło zdolność przenoszenia pełnego obciążenia dla zadanych warunków współpracy.
Źródło:: Journal of KONES; 2007, 14, 2; 99-106
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Modelling influence of temperature for assessment of wear elements of frictional joints
Modelowanie wpływu temperatury na ocenę zużycia elementów skojarzeń ciernych
Autorzy:: Pakowski, C.
Kałdoński, T. J.
Kałdoński, T.
Powiązania:: https://bibliotekanauki.pl/articles/243040.pdf
Data publikacji:: 2007
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: tarcie suche
rozszerzalność cieplna
zużycie tarciowe
dry friction
thermal expansion
abrasive wear
Opis:: In the article is presented continuous method for measurement of wear in conditions of technically dry friction of tribological cinematic pairs type pin-on-disk of T-11 tester, for example. Also is discussed modification of measurement system tester, which it makes possibility synchronization measurement respecting angle position of counter-sample. For six selected joints is appointed a correction for thermal expansion in dependence on temperature offrictional pair as well on speed of temperature change. For continuous of recorder temperature and displacement are carried out research wear for typical materials as well as is measured total wear after finish test. The analysis of obtained results shows existence of correlation between total linear experimental wear and analytical value of total linear wear takes into consideration correlations for thermal expansion. However, during friction there is not correlation between recorded change of dimensions joint and total wear. It shows correction this model. Results calculations of linear wear are overstate in relation to obtained value of wear in direct measurements. It doesn't lower possibility using established method for interpretation results of research wear
W artykule przedstawiono metodę ciągłego pomiaru zużycia w warunkach tarcia technicznie suchego węzła tribologicznego typu trzpień-tarcza przy zastosowaniu testera T-11. Omówiono modyfikację układu pomiarowego testera umożliwiającą synchronizację pomiaru z położeniem kątowym przeciwpróbki. Dla sześciu wybranych skojarzeń wyznaczono poprawkę na rozszerzalność termiczną w zależności od temperatury węzła tarcia oraz od szybkości zmian tej temperatury. Wykonano badania zużycia wytypowanych materiałów, przy ciągłej rejestracji temperatury i przemieszczenia oraz zmierzono zużycie całkowite po zakończeniu testu. Analiza uzyskanych wyników wskazuje na istnienie korelacji między sumarycznym zużyciem liniowym skojarzenia wyznaczonym eksperymentalnie a obliczoną wartością zużycia liniowego, przy uwzględnieniu poprawki na rozszerzalność termiczną. Brak jest natomiast korelacji między rejestrowaną podczas tarcia zmianą wymiarów skojarzenia a zużyciem całkowitym. Dowodzi to prawidłowości przyjętego modelu, konieczne jest jednak poprawienie jego dokładności. Wyniki obliczeń zużycia liniowego są zawyżone w stosunku do wartości zużycia uzyskanych w pomiarach bezpośrednich. Nie obniża to jednak możliwości stosowania przyjętej metody do interpretacji wyników badania zużycia.
Źródło:: Journal of KONES; 2007, 14, 2; 347-353
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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