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Research on spectrographic oil analysis of 12VE-230ZC diesel engine

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Science China Mathematics 2001年第S1期44卷 454-458页

作者： TIAN Hongxiang YAN Xinping PIAO Jiazhe ZHANG Yepeng 1. Reliability engineering Institute, Wuhan University of Technology, Wuhan 430063, China 2. The Naval University of engineering, Wuhan 430033, China 3. mechanical Department, Hubei Polytechnical University, Wuhan 430068, China Wuhan Univ Technol Reliabil Engn Inst Wuhan 430063 Peoples R China Naval Univ Engn Wuhan 430033 Peoples R China Hubei Polytech Univ Dept Mech Wuhan 430068 Peoples R China

With the spectrographic analysis, this paper analyzes the concentration of elements inoil, such as Fe, Cu, Cr, Al, Si etc. In order to monitor conditions and diagnose faults, the correlationcoefficient of main element... 详细信息

关键词： spectrographic analysis wear condition monitoring faults diagnosis

Influence of the Partial Substitution of industrial Clinker by Volcanic Lava Powder from Nyiragongo Volcano on the Physical Properties of Mortars

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Journal of Minerals and Materials Characterization and engineering 2023年第5期11卷 172-196页

作者： Seke Vangu Max Clement Nzau Umba Di Mbudi Makanzu Imwangana Fils Seke Makunga Daudet Efoto Eale Louis Department of Physics and Technology Faculty of Science and Technology University of Kinshasa Kinshasa The Democratic Republic of the Congo Faculties of engineering & Architecture Kongo University Mbanza-Ngungu The Democratic Republic of the Congo Department of Geosciences Faculty of Sciences and Technologies University of Kinshasa Kinshasa The Democratic Republic of the Congo Centre of Research on Geology and Mining Laboratory of Geomorphology and Remote Sensing Kinshasa The Democratic Republic of the Congo National Institute of Building and Public Works INBTP Kinshasa The Democratic Republic of the Congo Sibanye-StillWater Ltd. Johannesburg South Africa

This study evaluates the pozzolanicity of Nyiragongo volcano lava flows in Congo by an indirect method using mortars with different rock powder proportions. The clinker used is a locally produced alite clinker, whose chemical and mineralogical composition was determined by XRF, Bogue and Taylor formulas. The lava flows were collected from the 2002, 2010 and 2021 eruption sites, and were characterized by XRF, CIPW normative mineralogy and geomechanical tests. The results show that Nyiragongo rocks are ultrabasic, silica- and alkali-rich, and contain minerals like nepheline, wollastonite and leucite. They satisfy the natural pozzolan criterion, and have pozzolanic activity indices above 70%. These rocks also have high RC and LA resistances, ranging from 190 MPa to 45 MPa, and from 18% to 32.6%, respectively. The rock powder addition in the mortars reduces mechanical resistances and increases setting times, except for a 5% replacement rate, which speeds up hardening. Nyiragongo lava can be used as a pozzolanic addition to produce a CEM II/B-P 32.5 cement.

关键词： Pozzolan Cement Alite Nyiragongo ASR (Alkali-Silica Reaction)

QUALITY CONTROL OF HYPOID GEARS USING GEAR MEASURING MACHINE

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QUALITY CONTROL OF HYPOID GEARS USING GEAR MEASURING MACHINE

International Technology and Innovation Conference 2006

作者： TETSUTARU Oguma AIZOH Kubo Osaka Seimitsu Kikai Co.Ltd. 730-2 MikuriyaHigashi-OsakaOsaka 577-0032Japan Kyoto University dept.Prec.Eng. Kyoto 606-8501Japan

＜正＞It is quite difficult to design, manufacture and measure hypoid gears, because it has a complex tooth flank form. Noise and vibration caused by inaccurate tooth flank form of hypoid gears is a big problem in automotive industry, and it becomes clear that a small deviation in tooth flank form can change gear noise considerably. High precision measurement of geometrical accuracy of tooth flank form of hypoid gears becomes recently possible not only by point-to-point measuring method but also by scanning tooth flanks. The measurement of hypoid gear tooth flank form and its data treatment are very difficult jobs because the gear tooth flank form is quite complex. The scanning measurement method which is first developed in the world to measure tooth flank form by using the virtual conjugate reference tooth surface, and the method of usage and treatment of its measured data for hypoid gears are introduced in detail. The scanning measurement has great information and enables quick, fully automated measurement of tooth profile and lead, therefore it is to suit controlling and management of tooth flank form quality for mass production of spiral bevel and hypoid gears. Some experiences and the effectiveness of the measurement of tooth flank form accuracy of hypoid gears are discussed.

关键词： Hypoid gears precision measurement accuracy performance simulation quality control.

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脆性类岩石材料边缘裂纹扩展规律试验研究

采矿与岩层控制工程学报 2020年第3期2卷 59-68页

作者：张保良沈宝堂张金虎张新国聊城大学建筑工程学院山东聊城252000 山东科技大学矿业与安全工程学院山东青岛266590 中煤科工开采研究院有限公司北京100013 天地科技股份有限公司开采设计事业部北京100013 煤炭科学研究总院开采研究分院北京100013 The Commonwealth Scientific and industrial Research Organisation Queensland 4069Australia

为研究脆性岩石边缘裂纹扩展规律,以自制的类岩石材料试件为研究对象,采用单轴加载、声发射监测及FRACOD^2D数值模拟相结合的方法,对预制边缘裂纹的起裂、扩展及声发射特征进行了研究。试验结果表明:随着预制边缘裂纹宽度的增加,试件的... 详细信息

为研究脆性岩石边缘裂纹扩展规律,以自制的类岩石材料试件为研究对象,采用单轴加载、声发射监测及FRACOD^2D数值模拟相结合的方法,对预制边缘裂纹的起裂、扩展及声发射特征进行了研究。试验结果表明:随着预制边缘裂纹宽度的增加,试件的起裂强度、单轴抗压强度逐渐减小,I型拉伸裂纹出现的时间越来越早,剪切裂纹出现的时间越来越晚;试件的破坏形式不因预制边缘裂纹宽度不同而改变,最终以拉伸破坏为主。声发射监测中,裂纹起裂和试件整体破坏时声发射具有阶梯状波动、能量高的特点;边缘裂纹宽度越大,第1次出现能量峰值时间越早;I型破坏产生在线弹性阶段,大多数剪切与次生裂纹产生在峰值强度附近,其能量水平远大于拉伸裂纹起裂点能量值。数值模拟试验过程中,随着裂纹宽度增加,裂纹起裂角度越趋近于加载方向,裂纹数目增多,总位移由4.7 mm降低到1.07 mm,最大拉应力由58.2 MPa减小到26.8 MPa,试件的破坏形式与力学试验相同。

关键词：脆性类岩石材料边缘裂纹扩展规律声发射监测技术 FRACOD^2D

Longitudinal waves in one dimensional non-uniform waveguides

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Theoretical & Applied Mechanics Letters 2011年第2期1卷 33-36页

作者： Shuqi Guo,~(1,a) Zhi Zhang,~2 and Shaopu Yang~3 1)Department of Mechanics,Shijiazhuang Tiedao University,Shijiazhuang 050043,China. 2)School of Civil engineering,Shijiazhuang Tiedao University,Shijiazhuang 050043,China 3)School of mechanical engineering,Shijiazhuang Tiedao University,Shijiazhuang 050043,China Shijiazhuang Tiedao Univ Dept Mech Shijiazhuang 050043 Hebei Peoples R China Shijiazhuang Tiedao Univ Sch Civil Engn Shijiazhuang 050043 Hebei Peoples R China Shijiazhuang Tiedao Univ Sch Mech Engn Shijiazhuang 050043 Hebei Peoples R China

Wave approach is used to analyze the longitudinal wave motion in one dimensional non-uniform *** assumptions of constant wave velocity and no wave conversion,there exist four types of non-uniform rods and corresponding traveling wave solutions are *** obtained results indicate that the kinetic energy is preserved as a constant and the wave amplitude is inversely proportional to square root of the cross-sectional area of the *** certain condition,there exists a cut-off frequency for the rod with variation in geometric or material properties,below which waves do not propagate along the non-uniform *** the rod with arbitrary variable cross-section, the conclusions are similar if the wave frequency is high *** a series solution of the wave motion is presented.

关键词： longitudinal wave traveling solution cut-off frequency non-uniform rod

The pre-stack migration imaging technique for damages identification in concrete structures

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Theoretical & Applied Mechanics Letters 2011年第5期1卷 18-21页

作者： Ying Luo,1,Ziping Wang,1,Baiqiang Xu,1,2,and Fuhgwo Yuan 1,3,1) Key Laboratory for mechanical Structure Damage Detection Technology of China Machinery Industry Federation,Jiangsu University,Zhenjiang 210013,China 2) Faculty of Science,Jiangsu University,Zhenjiang 210013,China 3) Department of mechanical and Aerospace engineering,North Carolina State University,Raleigh NC 27695-7921,USA Jiangsu Univ Key Lab Mech Struct Damage Detect Technol China M Zhenjiang 210013 Peoples R China Jiangsu Univ Fac Sci Zhenjiang 210013 Peoples R China North Carolina State Univ Dept Mech & Aerosp Engn Raleigh NC 27695 USA

Pre-stack migration imaging (PMI) method,which is used in geophysical exploration by the performance of single side detection and visually display,can be used to identify the location,orientation,and severity of damages in concrete *** particular,this letter focuses on the experimental study by using a finite number of sensors for further practical applications.A concrete structure with a surface-mounted linear PZT transducers array is *** types of damages,horizontal,dipping and V-shaped crack damage,have been studied.A pre-stack reverse time migration technique is used to back-propagate the scattering waves and to image damages in concrete *** migration results from the scattering waves of an artificial damage are *** is shown that the existence of the damage in concrete structure is correctly revealed through migration process.

关键词： ultrasonic waves PMI damage identification

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纳米碳纤维混凝土力学性能的试验研究

铁道科学与工程学报 2011年第3期8卷 18-24页

作者：高迪彭立敏 Y．L．Mo 中南大学土木工程学院湖南长沙410075 CEE dept University of Houston Houston Texas 77004 USA

纳米碳纤维作为一种新型材料,具有高强度,高弹性模量等力学上的优异特性。通过单轴抗压试验和劈裂试验,测试了掺加3种类型纳米碳纤维的普通混凝土和自密实混凝土的基本力学性能,并讨论其最优掺量。实验结果表明:适当掺量且纤维分散良好... 详细信息

纳米碳纤维作为一种新型材料,具有高强度,高弹性模量等力学上的优异特性。通过单轴抗压试验和劈裂试验,测试了掺加3种类型纳米碳纤维的普通混凝土和自密实混凝土的基本力学性能,并讨论其最优掺量。实验结果表明:适当掺量且纤维分散良好的纳米碳纤维混凝土28 d抗压强度和劈裂强度均有不同程度的提高,表明纳米碳纤维对于混凝土材料力学性能有很好的增强作用。

关键词：纳米碳纤维混凝土抗压强度劈裂强度增强作用

Microwave apparatus to study the mechanical behavior of solid samples subjected to external stresses

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Microwave apparatus to study the mechanical behavior of soli...

Analysis of a piezoelectric screw dislocation inside an elliptical inhomogeneity with confocal rigid line in piezoelectric material

实验力学国际会议

作者： F.Mango M.G.Ascenzi G.Aschero S.Battaglia A.Benvenuti P.Gizdulich Physics Department and I.N.F.M. Via Buonarroti 2 56127 Pisa Italy Department of Orthopedic Surgery Biomechanics Research UCLA U.S.A. Physics Department and I.N.F.M. Via Buonarroti 2 56127 Pisa Italy I.I.R.G. Area di Ricerca C.N.R. Via Moruzzi 1 56011 Pisa Italy dept. of Experimental Medicine and Pathology "La Sapienza" University 00161 Rome Italy Clinical Physiopathology dept. University of Florene 50134 Florence Italy

＜正＞ We present a differential microwave apparatus to investigate the mechanical behavior of samples subjected to any stress which produces a change in the sample length. The device measures small displacements through the measurement of the resonance frequency variation of a microwave resonator compared to that of a reference resonator. The relative sensitivity （Δv/v） is about 10-8 in the resonance frequency of the resonator and corresponds to a （Δh/h） of about 7×10-8 in the height of the resonator, having such dimensions as to resonate in the TE011 mode in the X band. This means that changes in the sample length of some nanometers can be measured, whatever is the value of the sample length. The resolution of the device of some nanometers "single shot" looks high enough, however the good stability of the apparatus along long periods allows that periodic stresses and averaging may be applied, in this way the resolution becomes some picometers. The extended measurement range is another interesting feature of the apparatus, indeed, if the DC coupling is used, with the resolution limit less than one ten of nanometers, a displacement up to 100 micrometers can be recorded. The frequency response ranges from DC to some Hz.

关键词： Residual strain metals biological composites thermal cycling piezoelectricity dilatometer

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Theoretical & Applied Mechanics Letters 2011年第6期1卷 10-13页

作者： Chunzhi Jiang,1,2,3, ) Chao Xie,1,2 Youwen Liu,1,2 and Xin Zeng1,2 1)State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Changsha 410082, China 2)College of mechanical and Vehicle engineering, Hunan University, Changsha 410082, China 3)Department of Physics and Electronic Information engineering, Xiangnan University, Chenzhou 423000, China Hunan Univ State Key Lab Adv Design & Mfg Vehicle Body Changsha 410082 Hunan Peoples R China Hunan Univ Coll Mech & Vehicle Engn Changsha 410082 Hunan Peoples R China Xiangnan Univ Dept Phys & Elect Informat Engn Chenzhou 423000 Peoples R China

This paper deals with the electro-elastic coupling interaction between a piezoelectric screw dislocation which is located inside the elliptical inhomogeneity and an electrically conductive confocal rigid line under remote anti-plane shear stresses and in-plane electrical loads in piezoelectric composite material. The analytical-functions of the complex potentials, stress fields and the image force acting on the piezoelectric screw dislocation are obtained based on the principle of conformal mapping, the method of series expansion, the technical of analytic continuation and the analysis of singularity of complex potentials. The rigid line and the piezoelectric material property combinations upon the image force and the equilibrium position of the dislocation are discussed in detail by the numerical computation.

关键词： complex variable method rigid line piezoelectric material piezoelectric screw dislocation elliptical inhomogeneity