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Experimental study on the feasibility of alternative materials for tilting pad thrust bearings operating in transition to mixed friction

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Friction 2024年第4期12卷 812-822页

作者： michałWASILCZUK michałwodtke Faculty of Mechanical Engineering and Ship Technology Gdańsk University of TechnologyGdańsk 80-233Poland

In hydrodynamic bearings traditional bearing alloys:Babbitts and bronzes are most frequently *** sliding layers are sometimes applied as a valuable *** diamond-like carbon(DLC)coatings,which are also considered for certain applications may show some advantages,as *** material selection is of secondary importance in a full film lubrication regime it becomes important in mixed friction conditions,which is crucial for bearings with frequent starts and *** research aimed at studying the performance of fluid film bearings in the specific operating regime,including the transition to mixed friction,is described in the *** tests were carried out on four tilting pad bearings of different material compositions:Steel/bronze,DLC/steel,steel/polyether ether ketone(PEEK),and steel/*** tests comprised stopping under load and reproduction of the Stribeck curve by decreasing rotational speed to very low values,and observing the changes of friction force during the transition to mixed friction *** of the transition conditions and other results showed clear differences between the tested bearings,illustrating the feasibility of less popular material compositions for bearings operating in specific *** specifically,the DLC/steel bearing was demonstrating superior performance,*** friction,transition to mixed friction occurring at higher load,and more stable performance at start-stop regime over the other tested bearings.

关键词： tilting pad thrust bearing experimental research start-stop regime polyether ether ketone(PEEK) diamond-like carbon(DLC)coating metallic bearing alloys

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Effect of presence of lifting pocket on the THD performance of a large tilting-pad thrust bearing

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Friction 2015年第4期3卷 266-274页

作者： Michel FILLON michałwodtke michałWASILCZUK Institut Pprime CNRS-Universitéde Poitiers-ISAE-ENSMADépartement Génie Mécanique et Systèmes ComplexesBP 30169SP2MI86962 Futuroscope Chasseneuil CedexFrance Faculty of Mechanical Engineering Gdansk University of TechnologyGdanskPoland

Hydrostatic assistance is a commonly used method to improve limited load carrying ability of tilting-pad thrust bearings during transient states of operation of vertical shaft *** of special hydraulic equipment(as pumps,valves,etc.),it also requires manufacturing of special recesses/pockets at pad sliding surfaces,into which oil is injected under high *** allows to lift the rotor before start-up of the machine and form a hydrostatic film between pads and *** is a quite wide variety of geometry of recesses(shape,depth,and size)met in practical large bearing *** presence of a hydrostatic pocket(usually located in the sliding surface above the pivot area,where thin film,high oil pressure and temperature are observed)affects bearing performance under hydrodynamic *** theoretical researches,there is an almost common practice not to include hydrostatic recess in thermohydrodynamic(THD)or thermoelastohydrodynamic(TEHD)*** is probably due to the problems with obtaining solution for oil film geometry with pocket,the order of magnitude of the pocket depths being larger than gap *** this paper,an attempt was taken to study the effect of lifting pocket on THD performance of a large tilting-pad thrust bearing of Itaipu power *** performance was evaluated including recess shape for several cases of its *** results show that hydrostatic recess changes calculated bearing properties quite significantly,especially in vicinity of the pocket.

关键词： lifting pocket tilting-pad thrust bearing THD regime numerical simulations

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A Surface Femtosecond Two-Photon Photoemission Spectrometer for Excited Electron Dynamics and Time-Dependent Photochemical Kinetics

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Chinese Journal of Chemical Physics 2010年第3期23卷 255-261,I0001页

作者：任洋峰周传耀马志博肖春雷毛新春戴东旭 Jerry LaRueb Russell Cooper Alec M. wodtke 杨学明中国科学院大连化学物理研究所分子反应动力学国家重点实验室大连116023 加州大学圣芭芭拉分校化学与生物化学系 CA93106

A surface femtosecond two-photon photoemission （2PPE） spectrometer devoted to the study of ultrafast excited electron dynamics and photochemical kinetics on metal and metal oxide surfaces has been constructed. Low energy photoelectrons are measured using a hemispherical electron energy analyzer with an imaging detector that allows us to detect the energy and the angular distributions of the photoelectrons simultaneously. A Mach-Zehnder interferom- eter was built for the time-resolved 2PPE （TR-2PPE） measurement to study ultrafast surface excited electron dynamics, which was demonstrated on the Cu（111） surface. A scheme for measuring time-dependent 2PPE （TD-2PPE） spectra has also been developed for studies of surface photochemistry. This technique has been applied to a preliminary study on the photochemical kinetics on ethanol/TiO2（110）. We have also shown that the ultrafast dynamics of photoinduced surface excited resonances can be investigated in a reliable way by combining the TR-2PPE and TD-2PPE techniques.

关键词： Femtosecond two-photon photoemission spectropy Time-resolved Ultrafast excited electron dynamics Surface photochemical kinetics

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Preparation of Composited Graphene/PEDOT:PSS Film for Its Possible Application in Graphene-based Organic Solar Cells

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Journal of the Chinese Ceramic Society 2015年第2期 65-68页

作者： YU Yue LI Meicheng CHU Lihua YU Hakki wodtke A.M. ZHAO Yan ZHANG Zhongmo School of Renewable Energy North China Electric Power University 102206 Beijing China Chongqing Materials Research Institute Chongqing 400707 China Institut fur Physikalische Chemie Georg-August-Universitat Gottingen37077 Gottingen Germany

The interface between graphene and organic layers is a key factor responsible for the performance of graphene-based organic solar cells(OSCs). In this paper, we focus on coating PEDOT:PSS onto the surface of graphene. We demonstrate two approaches, applying UV/Ozone treatment on graphene and modifying PEDOT:PSS with Zonyl, to get a PEDOT:PSS well-coated graphene film. Our results prove that both methods can be effective to solve the interface issue between graphene and PEDOT: PSS. Thereby it shows a positive application of the composited graphene/PEDOT:PSS film on graphene-based OSCs.

关键词： graphene PEDOT:PSS composite materials coating

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