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Relations between thickness of UHMWPE’s wear debris and positive pressure of tribological system

Chinese Science Bulletin 2008年第9期53卷 1435-1443页

作者： liu hongtao1,2,3 & ge shirong1,3 1 institute of tribology and reliability engineering, china university of mining & technology, xuzhou 221116, china 2 College of Mechanical and Electrical engineering, china university of mining & technology, xuzhou 221116, china 3 Biotribology Center, State Key Laboratory of tribology, xuzhou 221116, china institute of tribology and reliability engineering China University of Mining & Technology Xuzhou China College of Mechanical and Electrical engineering China University of Mining & Technology Xuzhou China Biotribology Center State Key Laboratory of Tribology Xuzhou China

MiaoXAM2.5X-50X Ultrahigh Precision Surface 3D Profiler is introduced to research the relations be- tween thickness of UHMWPE’s wear debris and positive pressure of tribological system. Research re- sults show that thickness of wear debris owns evident classification, and the first grade thickness math model and the second grade thickness math model are built. By the second grade thickness math model, the true force condition in the tribological system can be gotten, and the model can be used as a tool to modify simulating parameters of the tribological system, and it is an important inspecting method to the airtight system which cannot be examined in real time. The first grade thickness math model can describe the true working load and surface condition of work piece in the tribological sys- tem, and is an effective description method for the running condition of frictional pairs. The research results at different lubricating conditions testify the relations between thicknesses of wear debris and positive pressure of the tribological system. The fractal relation between maximal thickness of wear debris and positive pressure is discussed. The conceptions of the immutability principle and charac- teristic granularity of wear debris thickness are brought forward and discussed. In conclusion, as a stable tribological parameter owning mechanical theory basis, wear debris thickness will play an im- portant part in fault diagnosis, especially for the airtight system such as artificial joint.

关键词：摩擦学磨损面厚度分形数学模型

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Description to wear debris boundaries by radar graph fractal method

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Chinese Science Bulletin 2007年第16期52卷 2285-2290页

作者： liu hongtao1,2 & ge shirong1 1 institute of tribology and reliability engineering,china university of mining & technology,xuzhou 221008,china 2 College of Mechanical and Electrical engineering,china university of mining & technology,xuzhou 221116,china institute of tribology and reliability engineering China University of Mining & Technology Xuzhou China College of Mechanical and Electrical engineering China University of Mining & Technology Xuzhou China

In this paper,radar graph fractal method is introduced to describe wear debris boundaries. Research results show that it is a nice way to describe wear debris boundaries. Since the longest axis is selected as the first coordinate axis,its center point selected as the center point of the radar graph,and the co-ordinate value of wear debris boundary selected as the measure parameter,the limitations existing in Yard fractal measure method can be avoided. For any wear debris,its radar graph fractal dimension value is one and only,and as the wear debris shape changes from round to strip,the radar graph fractal dimension value also changes from low to high,showing strong uniqueness and independence. Due to the fact that the researched wear debris is gotten in different wear states,the results also prove that radar graph fractal dimension value is correlated with frictional pairs work condition and wear state. Radar graph fractal method is compared with Yard fractal measure methods,and results show that ra-dar graph fractal dimension values gotten from different wear debris have enough value grads to avoid effect of errors,and provide higher sensitivity for wear debris shape. This paper also discusses the influencing factors for radar graph fractal method. With the increase of the decomposing degree value,the radar graph fractal dimension tends to keep stable at one certain value,showing the typical characteristic of the fractal theory. All this proves that radar graph fractal method is an effective description method for wear debris boundaries.

关键词：磨粒边界雷达图表分形法

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Friction behavior of coupling motion for natural articular cartilage by reciprocating rotation

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Chinese Science Bulletin 2009年第4期54卷 576-583页

作者： QIAN ShanHua1,2,3 & ge shirong1,3 1 College of Mechano-electronic engineering, china university of mining & technology, xuzhou 221116, china 2 institute of tribology and reliability engineering, china university of mining & technology, xuzhou 221116, china 3 Biotribology Center, State Key Laboratory of tribology, xuzhou 221116, china College of Mechano-electronic engineering China University of Mining & Technology Xuzhou China institute of tribology and reliability engineering China University of Mining & Technology Xuzhou China Biotribology Center State Key Laboratory of Tribology Xuzhou China

Based on the irregular surface of natural cartilage configurations, the tribological characteristics of coupling motion between natural cartilage pairs were investigated by the variation of rotated offset and velocity. Contact displacement, contact load, friction force and coefficient of friction from natural cartilage pairs were measured by a UMT-2 testing machine. In order to obtain the steady part and wavy part, the contact load and contact displacement were decompounded by the five-point sliding average method. These results showed that the contact load was composed of steady load and wavy load. And the contact displacement was composed of cartilage deformation and surface outline. The steady load was similar to exterior load while natural cartilage deformation increased nonlinearly with the sliding time. Wavy load had the correlative coefficient 0.235 with surface outline due to the irregular surface of friction configurations. The coefficient of friction from cartilage friction configurations was less influenced by smaller magnitude in rotated parameters. A few strange summits were obtained in the area of coef-ficient of friction, and significantly related with local minimal values corresponding to the contact loads. The rotated offsets had clear impact on contact load and a slight impact on contact displacement. Larger offset produced higher wavy magnitude of the contact load. The rotated velocities played an evident role in cartilage deformation, but had a less influence on contact load. Lower velocity brought larger cartilage deformation.

关键词：软骨构造关节软骨摩擦系数软骨变形接触装

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Wettability Modification for Biosurface of Titanium Alloy by Means of Sequential Carburization

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Journal of Bionic engineering 2009年第3期6卷 219-223页

作者： Yong Luo~(1,2) Shi-rong ge~1 Zhong-min Jin~21.institute of tribology and reliability engineering,School of Material Science and engineering,china university of mining and technology,xuzhou 221008,P.R china2.institute of Medical and Biological engineering,School of Mechanical engineering,university of Leeds,Leeds LS2 9JT,UK institute of tribology and reliability engineering School of Material Science and Engineering China University of Mining and Technology Xuzhou P. R. China institute of Medical and Biological engineering School of Mechanical Engineering University of Leeds Leeds UK

Microporous titanium carbide coating was successfully synthesized on medical grade titanium alloy by using sequential *** in the surface morphology of titanium alloy occasioned by sequential carburization were characterized and the wettability characteristics were ***,the dispersion forces were calculated and *** results indicate that sequential carburization is an effective way to modify the wettability of titanium *** the carburization the surface dispersion force of titanium alloy increased from 76.5×10^(-3)J·m^(-2) to 105.5×10^(-3) J·m^(-2),with an enhancement of 37.9 %.Meanwhile the contact angle of titanium alloy decreased from 83° to 71.5°,indicating a significant improvement of wettability,which is much closer to the optimal water contact angle for cell adhesion of 70°.

关键词： biotribology wettability titanium alloy sequential carburization biosurface

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Study on the characterization of the surface topography of friction pairs during wear process with fractal theory

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Science china Mathematics 2001年第S1期44卷 259-262页

作者： ZHU Hua ge shirong WANG Haihu CAO Jianwen CHEN Guoan 1. china university of mining and technology, xuzhou 221008, china 2. Command institute of the Corps of Engineers, xuzhou 221004, china china Univ Min & Technol Xuzhou 221008 Peoples R China Corps Engineers Command Inst Xuzhou 221004 Peoples R China

Wear of machine parts is an important problem in operating life of machines. Rationalwear and running-in procedures are able to machine parts improve in conformity, surface topog-raphy and frictional compatibility during usage, therefore improving machine reliability and pro-longing its operating life. Hence, it is necessary to study the topography characterization of thesurfaces of friction pairs and its change laws in wear or running-in process. This paper appliesfractal theory to study the characterization of the worn surface topographies of friction pairs duringthe initial stage of wear process. Experimental researches show that the fractal parameters of thesurface topographies of friction pairs will reach their steady-state values, respectively, with thewear process going on. And the variations of the fractal parameters have corresponding laws fortwo samples of friction pairs.

关键词： friction pairs wear running-in surface topography fractal

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Numerical simulation of the blocking process of gelled particles in porous media with remaining polymers

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Petroleum Science 2009年第3期6卷 284-288页

作者： Feng Qihong Zhang ge Yin Xiaomei Luan Zhiyong School of Petroleum engineering China University of Petroleum Dongying Shandong 257061 China Oil Production Research institute Shengli Oilfield Company Sinopec Dongying Shandong 257000 China

gelled particles can be transferred deeply inside oil reservoirs to block water channels due to their physicochemical characteristics, including swelling, deformation, and synergetic effect （reacting with polymers）, and then the injection profiles are significantly modified. At present, research on gelled particles is mainly focused on laboratory studies of drive mechanisms, and rarely on mathematical models describing the blocking process of gelled particles. In this paper, the blocking process of gelled particles is divided into two sub-processes： deposition and desorption due to particle deformation. A mathematical model based on filtration theory is proposed considering the effect of characteristics of gelled particles on the blocking process. Blocking laws were simulated and researched using the mathematical model. Results of the simulation of the blocking of gelled particles are quite consistent with the experimental results, which confirms the reliability of the mathematical model developed.

关键词： gelled particles profile control blocking process numerical simulation swelling synergetic effect deformation

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A Fault Diagnosis Method for Smart Meters via Two-layer Stacking Ensemble Optimization and Data Augmentation

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Journal of Modern Power Systems and Clean Energy 2024年第4期12卷 1272-1284页

作者： Leijiao ge Tianshuo Du Zhengyang Xu Luyang Hou Jun Yan Yuanliang Li School of Electrical and Information engineering Tianjin UniversityTianjin 300072China School of Computer Science(National Pilot Software engineering School) Beijing University of Posts and TelecommunicationsBeijing 100876China Concordia institute for Information Systems engineering Concordia UniversityMontrealQC H3G 1M8Canada

The accurate identification of smart meter(SM)fault types is crucial for enhancing the efficiency of operationand maintenance(O&M)and the reliability of power ***,the intelligent classification of SM fault typesfaces significant challenges owing to the complexity of featuresand the imbalance between fault *** address these issues,this study presents a fault diagnosis method for SM incorporatingthree distinct *** first module employs acombination of standardization,data imputation,and featureextraction to enhance the data quality,thereby facilitating improvedtraining and learning by the *** enhance theclassification performance,the data imputation method considersfeature correlation measurement and sequential imputation,and the feature extractor utilizes the discriminative enhancedsparse *** tackle the interclass imbalance of datawith discrete and continuous features,the second module introducesan assisted classifier generative adversarial network,which includes a discrete feature generation ***,anovel Stacking ensemble classifier for SM fault diagnosis is *** contrast to previous studies,we construct a two-layerheuristic optimization framework to address the synchronousdynamic optimization problem of the combinations and hyperparametersof the Stacking ensemble classifier,enabling betterhandling of complex classification tasks using SM *** proposedfault diagnosis method for SM via two-layer stacking ensembleoptimization and data augmentation is trained and validatedusing SM fault data collected from 2010 to 2018 in Zhejiang Province,*** results demonstrate the effectivenessof the proposed method in improving the accuracyof SM fault diagnosis,particularly for minority classes.

关键词： Data augmentation fault diagnosis feature extraction smart meter Stacking ensemble optimization

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Preparation and properties of a new cutting pick of coal shearers

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mining Science and technology 2010年第5期20卷 794-796页

作者： LUO Yong ZHANG Dekun WANG Qingliang liu hongtao CHENG Gang ge shirong School of Material Science and engineering China University of Mining & Technology Xuzhou 221116 China School of Mechanical and Electrical engineering China University of Mining & Technology Xuzhou 221116 China

reliability and wear resistance of cutting picks play a significant role in coal mine exploitation with coal *** bit separation,blade breaking,severe erosion of the cutting body and fatigue fractures are the main reasons for failure of cutting *** carried out carburization on a 30CrMnMo alloy to synthesize a new cutting pick material with improved mechanical properties and high wear *** results indicated that carburization can effectively strengthen the surface of the 30CrMnMo alloy by forming a thick carburized layer and thus significantly improve the surface hardness and wear *** addition,the excellent toughness of 30CrMnMo alloy as a substrate of cutting picks can prevent brittle ruptures and fatigue fractures under high impact stress *** significant decrease in both frictional coefficient and rate of erosion of this carburized 30CrMnMo alloy suggests that this alloy is a potential material for cutting picks of coal shearers after rational carburization.

关键词： cutting picks coal shearer carburization wear

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Research on the friction and wear mechanism of Poly(vinyl alcohol)/hydroxylapatite composite hydrogel

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Science china(Technological Sciences) 2009年第8期52卷 2474-2480页

作者： ZHANG DeKun SHEN YanQiu ge shirong School of Materials Science and engineering China University of Mining and TechnologyXuzhou 221116China Biotribology Center State Key Laboratory of TribologyTsinghua UniversityBeijing 100083China Long Pan College Jin Ling Institute of TechnologyNanjing 211169China

Poly(vinyl alcohol)/Hydroxylapatite(PVA/HA) composite hydrogel was prepared with poly(vinyl alcohol) and hydroxylapatite as raw materials, using the method of repeated freezing and *** morphologies of PVA/HA composite hydrogel were observed by means of high-accuracy 3D profiler and scanning electron microscope(SEM).The compressive elastic modulus and the stress relaxation characteristics of PVA/HA composite hydrogel were measured using the flat-head cylinder *** friction and wear tests between PVA/HA composite hydrogel and bovine knee articular cartilage were performed on the *** worn morphologies of PVA/HA composite hydrogel were observed with environmental scanning electron microscope(ESEM).The results showed that PVA/HA composite hydrogel has the cross-link network microstructure which is similar to that of the natural bovine knee articular *** the increase of freezing-thawing cycles and the HA content, the degree of cross-link and the crystallization of PVA/HA composite hydrogel both increase, the elastic modulus increases evidently, the rate of stress relaxation is improved and the value of balance stress *** friction coefficient decreases with the increase of the freezing-thawing cycles and the HA *** more the freezing-thawing cycles are, the earlier the friction coefficient reaches the stable balance *** friction deformation depth between PVA/HA composite hydrogel and bovine knee articular cartilage is inversely proportional to freezing-thawing cycles and the HA *** main wear mechanisms of PVA/HA composite hydrogel are plastic flowing and adhesive *** wear severity degree decreases with the increase of freezing-thawing cycles and the HA content.

关键词： poly(vinyl alcohol) hydroxylapatite composite hydrogel microstructure tribological properties

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Nature of remagnetization of Lower Triassic red beds in southwestern china

Nature of remagnetization of Lower Triassic red beds in sout...

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中国科学院地质与地球物理研究所第11届（2011年度）学术年会

作者： Chengying liu,~(1,2) Kunpeng ge,~(1,2) Chunxia Zhang,~1 Qingsong liu,~1 Chenglong Deng~1 and Rixiang Zhu~1 1 State Key Laboratory of Lithospheric Evolution,institute of geology and geophysics,Chinese Academy of Sciences,Beijing 100029,china. 2 Graduate university of the Chinese Academy of Sciences,Beijing 100049,china

SUMMARY Widely distributed haematite-bearing red beds are an important source of palaeomagnetic field ***,unresolved issues regarding remagnetization and inclination shallowing in red beds have questioned the reliability of the palaeomagnetic results obtained from such *** this study,we investigated the remagnetization mechanism in red beds from Lower Triassic sandstones in Yunnan Province,southwestern *** results indicate that the characteristic remanent magnetizations(ChRMs) of most samples(112/125) are dominated by only one component at temperatures 80-660℃,with a mean direction of D/I= 0.9/46.6°(k = 440.2,α= 2.1°).The corresponding geomagnetic pole is 89.1°N, 331.7°E(k = 338.2,A=2.4°).This coincides with the present geomagnetic field,which is a strong indication that these ChRMs are *** rock magnetic and microscope investigations reveal that the remagnetization is due to the acquisition of a chemical remanent magnetization(CRM) carried by authigenic maghemite and *** the widespread remagnetization,about 7 per cent of the studied samples still record a magnetization that we consider to be primary that was isolated at high temperatures 610-660℃,with a mean direction of D/I = 213.3/18.6°(it = 16.0,α = 11.7°).We propose that the CRM overprinting is controlled by the overlapping degree of the unblocking temperature between the CRM carried by the authigenic haematite and the primary remanent magnetization carried by the detrital *** results further suggest that microscope investigation,rock magnetic proxies for the haematite concentration and susceptibility-temperature curves are useful methods for pre-selecting samples suitable for isolating the primary remanence at this *** linkage among the palaeomagnetic results,rock magnetic proxies and CRM remagnetization mechanism could be extended to other studies,although the detailed proxy would be different due to specific overprint process._

关键词： Remagnetization Rock and mineral magnetism Asia

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