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STUDY ON SHIFT SCHEDULE AND SIMULATION OF AUTOMATIC TRANSMISSION

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Chinese Journal of mechanical {1. 2001年第3期14卷 250-253页

作者： Gong Jie,Zhao Dingxuan (college of {1. Science and engineering ,Jilin University) 吉林大学机械科学与工程学院吉林长春

From the point of view of saving energy, a new shift schedule and auto-controlling strategy for automatic transmission are proposed. In order to verify this shift schedule, a simulation program using a software package of Matlab/ Simulink is developed. The simulation results show the shift schedule is correct. This shift schedule has enriched the theory of vehicle automatic maneuvering and will improve the efficiency of hydrodynanic drive system of the vehicle.

关键词： engineering vehicle Automatic transmission Shift schedule Simulation Saving energy

Discrete Element Modeling of Asphalt Concrete Cracking Using a User-def ined Three-dimensional Micromechanical Approach

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Journal of Wuhan University of Technology(Materials Science) 2011年第6期26卷 1215-1221页

作者：陈俊 college of Civil and Transportation {1. Hohai University

We established a user-defined micromechanical model using discrete element method （DEM） to investigate the cracking behavior of asphalt concrete （AC）. Using the ＂Fish＂ language provided in the particle flow code in {1.Demensions （PFC{1.）, the air voids and mastics in asphalt concrete were realistically built as two distinct phases. With the irregular shape of individual aggregate particles modeled using a clump of spheres of different sizes, the three-dimensional （{1.） discrete element model was able to account for aggregate gradation and fraction. Laboratory uniaxial complex modulus test and indirect tensile strength test were performed to obtain input material parameters for the numerical simulation. A set of the indirect tensile test were simulated to study the cracking behavior of AC at two levels of temperature, i e, -1. ℃ and 1. ℃. The predicted results of the numerical simulation were compared with laboratory experimental measurements. Results show that the {1. DEM model is able to predict accurately the fracture pattern of different asphalt mixtures. Based on the DEM model, the effects of air void content and aggregate volumetric fraction on the cracking behavior of asphalt concrete were evaluated.

关键词： discrete element method asphalt concrete cracking behavior three-dimensional simulation micromechanics

Effect of TiO_2 on the Formation of Clinker with High C_3.

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Journal of Wuhan University of Technology(Materials Science) 2009年第5期24卷 830-833页

作者：马先伟陈胡星 Cement-based Material Institute Tongji University Henan University of Urban Construction college of Material Science and Chemical {1. Zhejiang University

Effect of TiO2 content on the burnability of clinker with high C3. were investigated by determination of free lime in final product, and the clinker phase formation, microstructural features of C3. and the solubility of TiO2 in C3. were further studied by XRD, SEM/EDS analysis. TiO2 accelerates the combination of free lime in the samples, free lime content decreases obviously with TiO2 increasing up to 2% and almost remains above 2%. A new phase CaO·TiO2 was found when TiO2 was up to 3., and samples with TiO2 displayed well-formed uniform size hexagonal C3. crystal. The limit of solubility of TiO2 in C3. at 1.00 ℃ is about 1.7%.

关键词： TiO2 C3. formation

Terrain classification based on adaptive weights with airborne LiDAR data for mining area

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中国有色金属学会会刊：英文版 2011年第S3期21卷 648-653页

作者： LI Hui-ying1. WANG Zhi2, SUN Ya-feng1. LI Wen-hui1.1. college of Computer Science and Technology, Jilin University, Changchun 1.1.01., China 2. college of Resources and Civil engineering, Northeastern University, Shenyang 1.0004, China [a] college of Computer Science and Technology Jilin University Changchun 130012 China [b] college of Resources and Civil {1. Northeastern University Shenyang 110004 China

The fast high-efficiency inspection for mining subsidence of mine area is a reliable way for forecasting accident and evaluating losing expense. In order to monitor mining subsidence of exploitation mine efficiently, LiDAR data were used and a novel strip division method was brought forward based on separating-treatment theory, which divided the mass of discrete three-dimensional point cloud data into a series of parallel strips and reduced the dimension in each strip. Polynomial fitting algorithm based on the adaptive weights, which located in the range of the strip, was used for classification complex terrain data of mine-area. The results show that LiDAR datamation can be greatly reduced. In the mean time, the time spending for calculation is shortened, and computational complexity is simplified. Therefore, high-efficiency terrain classification of LiDAR point cloud method can be great beneficial to monitoring environment of mine area.

关键词： mining subsidence airborne LiDAR strip division adaptive weights

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

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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 221.1., China 2 {1. of mechanical and Electrical engineering, China University of Mining & Technology, Xuzhou 221.1., China 3.Biotribology Center, State Key Laboratory of Tribology, Xuzhou 221.1., China Institute of Tribology and Reliability engineering China University of Mining & Technology Xuzhou 221116 China college of {1. and Electrical engineering China University of Mining & Technology Xuzhou 221116 China Biotribology Center State Key Laboratory of Tribology Xuzhou 221116 China

MiaoXAM2.5X-50X Ultrahigh Precision Surface 3. 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 {1. 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

Microstructural Evolution of Surface Layer of TWIP Steel Deformed by mechanical Attrition Treatment

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Journal of Iron and Steel Research International 2012年第3期19卷 38-46页

作者： LI Da-zhao1.2, WEI Ying-hui1. HOU Li-feng1. LIN Wan-ming1.(1. college of Materials and {1., Taiyuan University of Technology, Taiyuan 03.024, Shanxi, China 2. college of Materials and {1., North University of China, Taiyuan 03.051. Shanxi, China) [a] college of Materials and {1. Taiyuan University of Technology Taiyuan 030024 Shanxi China [b] college of Materials and {1. North University of China Taiyuan 030051 Shanxi China

A nanocrystalline layer was synthesized on the surface of TWIP steel samples by surface mechanical attri- tion treatment （SMAT） under varying durations. Microhardness variation was examined along the depth of the de- formation layer. Microstructural characteristics of the surface at the TWIP steel SMATed for 90 min were observed and analyzed by optical microscope, x-ray diffraction, transmission and high-resolution electron microscope. The re- sults show that the orientation of austenite grains weakens, and a-martensite transformation occurs during SMAT. During the process of SMAT, the deformation twins generate and divide the austenite grains firstly~ then a-martens- ite transformation occurs beside and between the twin bundles~ after that the martensite and austenite grains rotate to accommodate deformation, and the orientations of martensite and between martensite and residual austenite increase; lastly the randomly oriented and uniform-sized nanocrystallir^e layers are formed under continuous deformation.

关键词： SMAT technology twinning stacking fault energy deformation twin

Prediction for Dynamic Characteristics of Ring-Plate Planetary Indexing Cam Mechanism

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Transactions of Tianjin University 2009年第4期15卷 249-254页

作者：宋轶民田广才张俊刘明涛刘建平 School of mechanical {1. Tianjin University Handling Equipment mechanical Department Academy of Military Transportation School of mechanical {1. Tianjin University of Science and Technology

This paper is aimed to propose an approach to predict the dynamic characteristics of ring-plate planetary indexing cam mechanism, which is a novel type of indexing mechanism that employs internal planetary transmission structure. Firstly, the geometry and structure of the mechanism are discussed and the kinematic practicability is simulated with virtual prototype design. Then a 3. finite element model of the ring-plate planetary indexing cam mechanism is developed with the commercial software of MATLAB and ANSYS. Through the finite element analysis, the natural frequencies and the corresponding mode shapes are predicted in one motion cycle. On the basis of the virtual prototype design and finite element analysis, an experimental prototype is made and tested to validate the prediction of the dynamic characteristics. The agreement between experimental results and the finite element analysis testifies that the finite element model developed is applicable to the prediction of the dynamic characteristics of this type of mechanism.

关键词： ring-plate planetary indexing cam mechanism virtual prototype design finite element mode analysis

MOTION ANALYSIS AND DESIGN OF ACCUMULATOR FOR HYDRAULIC ROCK DRILL

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中国有色金属学会会刊：英文版 1996年第2期6卷 148-151页

作者： Liu Shixun(college of {1. and Electrical engineering, Central South University of Technology, Changsha 41.083. CENT S UNIV TECHNOL COLL MECH & ELECT ENGNCHANGSHA 410083PEOPLES R CHINA

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ＭＯＴＩＯＮＡＮＡＬＹＳＩＳＡＮＤＤＥＳＩＧＮＯＦＡＣＣＵＭＵＬＡＴＯＲＦＯＲＨＹＤＲＡＵＬＩＣＲＯＣＫＤＲＩＬＬＬｉｕＳｈｉｘｕｎ（ＣｏｌｌｅｇｅｏｆＭｅｃｈａｎｉｃａｌａｎｄＥｌｅｃｔｒｉｃａｌＥｎｇｉｎｅｅｒｉｎｇ，ＣｅｎｔｒａｌＳｏｕｔｈＵｎ...

关键词： hydraulic accumulator diaphragm service life stretching ratio parameter design,motion analvsis

Study on Laboratory Method for Refining of SR Diesel Fuel

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China Petroleum Processing & Petrochemical Technology 2006年第3期8卷 57-60页

作者： Li Junling1.Zheng Tinglu2 Han Zhaping3.(1. {1. of Chemistry and Chemical {1., China Petroleum University (East China) Dongying 257061.2. Shandong Jingbo Petrochemical Co. 3. Shandong Donghai Petrochemical Co.) college of Chemistry and Chemical {1. China Petroleum University (East China) Dongying 257061 China Shandong Jingbo Petrochemical Co. China Shandong Donghai Petrochemical Co. China

The method for refining the straight-run diesel fuel was studied in laboratory scale in order to make the acid number of diesel fraction comply with the standard while removing the naphthenic acids contained in diesel without causing environmental pollution. After comparing the effect of refining using three solvents, the isopropyl alcohol-HOA was specified as the best solvent. Meanwhile, the relationship between the acid number of diesel fraction and the amount of solvent used and the relationship between the concentration of solvent and temperature and the stability of diesel in terms of its acid number were also investigated. Experimental results had shown that when the mass fraction of the HOA-IPA solvent was 20% at a dosage of 1. mL of the solvent and a temperature of 3.℃, the acid number of the refined diesel fraction was 0.01. mg KOH/g with a good stability of acidity in the diesel fraction.

关键词： straight-run diesel deacidification refining naphthenic acid