bluuebunny/crossref_metadata_2025 huggingface dataset:
Effect of Constituents of EPDM/PVC Composite on Damping Capacity
Authors: Zuo Kong Cheng , Cai Zhen Bing , Cui Shu Xun , Zhou Shao Bing , Zhu Min Hao
Published: February 2012

An orthogonal experiment was employed to research the optimized blending formula to obtain the optimized damping property of Ethylene-Propylene-Diene Monomer (EPDM)/ Polyvinylchloride (PVC) composite. The influences of EPDM/PVC blending ratio, glass fiber, HAF and CPE for the EPDM/PVC composites on the damping characteristic were discussed in detail. The results showed that the order of influence factor was CPE>HAF>EMPM/PVC>glass fiber. It is concluded that the optimum formula was EPDM/PVC=60/40, glass fiber=3, HAF=40, and CPE=0 (phr). A better damping capacity EPDM/PVC composite has been acquired by orthogonal experiment method.
MD Simulation of Chip Formation in Nanometric Cutting of Metallic Glass
Authors: Zhao Yan , Zhang Yan , Liu Ri Ping
Published: February 2012

Great prospect in ultra precision leads to the urgent requirement for the research on the nanometric machining of metallic glass (MG). Molecular dynamics simulation is carried out to find out the nanometric cutting mechanisms of MG. The MG workpiece, Cu50Zr50, is prepared using fast cooling simulation in isothermal-isobaric ensemble. Interactions of Cu and Zr atoms are described by Finnis-Sinclair potential. Morse potential is adopted for the interaction between the carbon atom in the diamond tool and the metal atom in the workpiece. Simulation results show that, different from cutting crystal material, there is not visible shear zone ahead of the tool. That is to say the mechanism in nanometric cutting MG may be plastic cutting.
Design and Simulation of Drum Solid-State Fermentation Equipment Based on Solidworks
Authors: Xing Hong Yan , Zhang Yan Bin , Huang Wu Yang
Published: February 2012

The Drum Solid-state Fermentation Equipment was developed, the equipment included the parts of the feed, mixing, disinfection, cooling, inoculation and fermentation, and it could undertake sterile operation and control temperature automatically. The three-dimensional model of the equipment was built using the solidworks software. The selection of the material and structure of the key parts were optimized by using Simulation, and the stress was analysed by the software in solidworks. The running animation of the equipment was produced by using the plug-in module COSMOSMotion, which showed the real state of the equipment movement, such overall design improved the efficiency and accuracy.
Numerical Simulation on Effect of Nozzle-Hole Layout on Spray Characteristics and Combustion in a DI Diesel Engine
Authors: Zhang Jun , Zhao Chang Pu , Chen Nai Zhuan , Dong Da Lu , Zhong Bo
Published: February 2012

Diesel spray characteristics are closely related to the combustion of the engine where the spray tip penetration and the fuel atomization play a key role especially for direct injection (DI) diesel engine. With different nozzles, the fuel atomization and evaporation will be different thereby affecting the combustion and emission characteristics. A three-dimensional model is built based on the parameters of a DI diesel engine, and its validation is also validated. Three nozzle-hole layouts are designed in this research, including the conventional hole, multi-hole, and group-hole. The spray characteristics and combustion process are studied with three different nozzle-hole layouts by the way of numerical simulation. Further more, the effect of inter-hole spacing of group-hole nozzle on the evaporation rate and combustion process is researched here.
Effects of Magnesium Aluminate Spinel on the Properties of Al2O3-SiC-C Castables for Blast Furnace Iron Trough
Authors: Wei Jun Cong , Huang Jian Kun , Cao Chun Hui , Tu Jun Bo
Published: February 2012

The effects of varying the additions of magnesium aluminate spinel (0, 3, 6, 9, 12 wt. %) on the physical properties and slag resistance of Al2O3-SiC-C based castables were investigated. The composition of the specimens was determined by X-Ray diffraction (XRD). The results revealed that the incorporation of appropriate amount of MgAl2O4 in Al2O3-SiC-C based castables could promote the sintering of the specimens, decrease apparent porosity, and improve bulk density and strength. The slag resistance of the castables was improved due to an increase in the viscosity of molten slag, caused by the solid solution of Fe2+ or Fe3+ ions from the molten slag in MgAl2O4. However, further addition would led to a decrease in slag resistance because much Mg2SiO4 was produced.
Effects of the Z Value on the Properties of β-Sialon/ZrO2 Composites
Authors: Wang Rui Sheng , Wei Jun Cong , Zhao Jun Hong , He Yong Wu , Peng Fu Hua
Published: February 2012

β-Sialon/ZrO2 composites were prepared using 10 wt. % β-Sialon powder (where the z =1, 2, 3, respectively) and 90 wt. % ZrO2 powder as the starting materials. The effects of the Z value of β-Sialon on the bulk density, apparent porosity, water absorption rate, room temperature modulus of rupture, thermal shock resistance, microstructure and composition of the composites were investigated. The microstructure of sintered specimens was analyzed by scanning electron microscope (SEM), and X-Ray diffraction (XRD). The results revealed that with increase of the Z value of β–Sialon, bulk density gradually increased, apparent porosity and water absorption rate gradually decreased. The specimen possessed a maximum MOR (71.46MPa) when the z=2. In carbon embedded condition, the residual strength ratio of the specimen reached 60% and the lowest thermal expansion rate was obtained (0.55%) when the z=1. The phase compositions were cubic ZrO2 (c-ZrO2) and monoclinic ZrO2 (m-ZrO2). β-Sialon/ZrO2 composites exhibited overall optimum performance when the z equals 2
Effects of Technological Parameters on Properties of Ni Film Prepared by Supercritical Carbon Dioxide Emulsion
Authors: Lei Wei Ning , Liu Wei Qiao , Jiang Bo , Qian Mi , Tang Cong Shun
Published: February 2012

The effect of supercritical carbon dioxide emulsion (Sc-CO2-E) on the smooth and microhardness of nickel film electroplated using Watts bath was studied in this paper. Morphology of nickel film electroplated with Sc-CO2-E was found much uniform. Microhardness of nickel film electroplated with Sc-CO2-E was higher than that of nickel film electroplated through conventional method. A increasing of microhardness was found for nickel film electroplated through Sc-CO2-E when increasing experimental pressure from 12 to 18 MPa, and the smooth of nickel film be promoted. This was because of higher hydrogen solubility and higher mobility in Sc-CO2-E. Grain size of nickel film electroplated with Sc-CO2-E was found to be refinement.
Development and Application of a New Carburant Material
Authors: Chen Jun , Liu Chen Xin , Liang Xin Teng , Zeng Jian Hua , Chen Tian Ming
Published: February 2012

Anthracite carburant is adopted to increase the carbon during the steel tapping of the converter of Panggang, however, it is found that the smelting time is long and the yield rate of the carbon is low which severely affect the precision control of the heat composition, so the new type of carbon-manganese alloy carburant is developed and the application effect to the industry is investigated. The results show that this new type carbon-manganese alloy carburant smelting much faster, and the yield of the carbon and manganese are high, the average yield of carbon is 92.95%, which is 7.36% higher than anthracite, the manganese is 93.31%。This new type carburant for increasing the carbon can decrease the temperature of the tapping in the promise of keeping the quality of liquid steel, shorten the logistic time and reduce the cost of steel per ton.
Effect of Pd on CH4 Reforming with CO2 Catalyzed by Ni over Mixed Titian –Alumina Support
Authors: Al–Fatesh A.S. , Fakeeha A.H , Abasaeed A.E.
Published: February 2012

The catalytic reforming of methane with carbon dioxide using Pd promoter on 1% Ni/20%TiO2-P25+80%α-Al2O3 was investigated. An experimental study was carried out using the catalyst prepared by impregnation method. The catalysts were dried at 120°C and calcined at 900°C. The reforming reactions were carried out using CO2/CH4/N2 feed ratio of 5/5/1, F/W=44 ml/min.gcat and reaction temperature of 700°C. The effect of nominal load of Pd ranging from 0.0 to 0.48 was studied by evaluating catalyst activity, stability, coke and (H2/CO) ratio. The prepared catalysts were tested in micro reactor at atmospheric pressure. The effluents were analyzed using an online gas chromatography equipped with a thermal conductivity detector. EDS and TGA for the fresh and spent catalysts were evaluated. Results indicate that the addition of small amounts of Pd is preferable in terms of activity and carbon deposition than higher Pd loading. For instance, 0.01%Pd gives a conversion of 78.4 for CH4 and 4.9% deactivation factor. While, 0.48%Pd gives a conversion of 75.6 for CH4 and 29.9% deactivation factor. Thus higher loading of Pd causes the catalyst to show poor performance with lower conversion and higher carbon formations. It can be concluded that Pd promoter has an optimal concentration with respect to the active metal of the catalyst beyond which the performance deteriorates.
Abrasion Behavior of WC Reinforced Cast Iron Surface Composite Fabricated by Cast-Infiltration Method
Authors: Cao Guo Jian , Guo Er Jun , Feng Yi Cheng , Wang Li Ping
Published: February 2012

In this paper, WC particles and NH4HCO3 powders were mixed evenly, and then pressed under 150MPa. The WC porous preforms were obtained after the compacts being heat treated to eliminate NH4HCO3. The volume ratios of WC in the preforms were 30%, 40% and 50% respectively. WC/Fe composites were fabricated by infiltrating liquid cast iron into the WC porous preforms. Optic microscope and scanning electron microscope were employed to observe the microstructure of the matrix alloy and the composites. The results showed that matrix alloy without WC addition had pores in the surface. The microstructure of the composites with WC volume fractions of 30%, and 40% were denser than that of 50%. Hardness and wet sliding wear behaviors of the composites were investigated at room temperature. The addition of WC particles could effectively improve the hardness and the wear resistance of the composites. The influence of volume fractions on hardness of the composites was similar to that on wear resistance. The hardness and the wear resistance of the 40vol.%WC/Fe composite was better than those of the 30vol.%WC/Fe composite. And the properties of the 50vol.%WC/Fe composite were the worst.
Fabrication Process and Properties of Si3N4-SiC Ceramics by a Two Step Sintering Method
Authors: Fan Zi Min , Wang Xiao Gang
Published: February 2012

A new composite ceramics of Si3N4/ SiC were prepared by a two step sintering method with SiC powders and Si powders as main material. Its properties and structures were characterized by the porosity, bulk density, flexural Strength, XRD, SEM and EDS. The effects of particle grade and sintering temperature on its properties were studied. The results show that bulk density of powders is the largest when coarse powder of SiC (average diameter 120 um) is about 40% (by weight), with average diameter 80um of SiC is about 20% (by weight) and fine powder (average diameter 35 um) of of SiC is 10% (by weight). A minimum porosity, a maximum bulk density and flexural Strength were achieved by nitriding at 1450 °C for 2h and then two states sintering at 1700 °C. XRD analysis indicated that the the main crystalline phase of the ceramic made from α-SiC, α-Si3N4and β-Si3N4. SEM and EDS analysis indicated that a larger of wisker like α-Si3N4and some little β-Si3N4are found coating with SiC, giving its excellent mechanical properties.
Research and Realization of Hex Nut Standard Parts Library Based on Reusable Knowledge
Authors: Chen Qi , Liao Lin Zhi , Fan Li Hua , Liu Yong Xing
Published: February 2012

Product design requires a large amount of standard parts, But standard parts sort is various, In order to avoid duplication of work and Improve the efficiency of design, The establishment of standard parts library is very necessary, it Can reduce the repeated work and the cost. Using the expression and the function of part family, In the basis of searching a lot of material at home and abroad about establishment of standard parts library, combining with knowledge reuse technology, Based on the structural characteristics of the hex nut and assembly requirements, to standard parts matching, parameter-driven, fast assembly in-depth study, establish the standard parts library using parametric feature-based modeling approach, and provide fast assembly tool set, achieving standard parts intelligent assembly.
Modeling the Welding Process of the Low Alloy Ferritic Steels T/P23 and T/P24
Authors: de Castro José Adilson , Xavier Carlos Roberto , Moreira Luciano Pessanha , Sazaki Yasushi
Published: February 2012

In this paper a model based on transport equations is proposed to study the weldability of low alloy ferritic steels T/P23 and T/P24. The model was numerically implemented by using the finite volume method (FVM) in an open source computational code to simulate the influence of the heat input, base metal thickness and preheating temperature on the thermal evolution and the cooling rate during the welding process. Meanwhile, it was possible to evaluate qualitatively the microstructure at the heat affected zone (HAZ) of these steels when a single weld bead was deposited on their surface and calculate the maximum hardness reached at this region. A double-ellipsoid heat source model for power density distribution was used in order to obtain a good estimate of the cooling rate and evolution of the fusion zone (FZ). The results are discussed and good agreement between experimental and simulated results was obtained for temperature distribution
Cellular Automaton Simulation and Experimental Observation of the Dynamic Recrystallization of Titanium Alloy TC11 with Varied Strain Rates
Authors: Yang Zhi Fu , Meng Qing Yuan , Jing Yu Hang
Published: February 2012

During the metal hot working process, the dislocation density will vary with strain and strain rate, and the variation of the dislocation density will affect the grain evolution subsequently. The cellular automaton (CA) method is an effective technique used to simulate the grain evolution of materials. In this work, a dynamic recrystallization (DRX) model of titanium alloy TC11 under varied strain rates was established by the use of cellular automaton method and verified by experimental observation. Two types of loading processes called “begin fast and then slowly” and “begin slowly and then fast” were simulated to investigate the titanium alloy TC11 grain evolution processes during hot working. The simulation results are in good coincidence with experimental data. Both cellular automaton simulation and experimental results show that the flow stresses and DRX transformation percentage during hot working process of the TC11 alloy are closely related not only to the strain rate but also to the loading sequence. Compared to the “begin slowly and then fast” loading sequence, the flow stress with the “begin fast and then slowly” loading sequence is relatively smaller under the same strain rates, and the DRX transformation percentage is relatively larger.
Effect of Ga on Microstructure and Mechanical Properties of the TiCu-Base Nano/Ultrafine Bimodal Structured Alloy
Authors: Zhang Xin Fang , Guo Xiao Qing , Gao Chang Yin , Jiang Zhi Qiang
Published: February 2012

The effects of 2at.% Ga addition on the microstructure and mechanical properties of the TiCu-base nano/ultrafine bimodal structured alloy were investigated systematically through XRD, OM, compressive test and SEM. The results showed that constitutional phases were changed from bcc -Ti(M) to unknown nanostructure + bcc -Ti(M), content of nanostructured matrix is increased, the calculated mean crystalline size was decreased from 12.6 to 11.7nm, and also, the yield and maximum strengths and plasticity were enhanced markedly. The reasons, which caused these phenomenons, were discussed.
Failure and Broken Criteria for 2.5D Woven Composites Loaded in Weft
Authors: Zheng Jun , Wen Wei Dong , Cui Hai Tao
Published: February 2012

2.5D woven composites has been used broadly. But its failure reason and process has not been researched clearly. To describe whole the tensile process in weft direction exactly, Based on the yield criteria ,yield criteria and elastic mould reduced rule are consummated to analyze the process of yield process; Meantime, Hoffman failure criteria is used to analyze the broken process and the corresponding elastic mould reduced rules is given. FEA method is adopted to simulate and analyze the whole tensile process of 2.5D woven composites in weft load at last. To verify the failure criteria and the corresponding elastic mould reduced rule, weft –tensile tests of six kind of 2.5D composites have been done. Results of contrast show that failure criteria and the corresponding elastic mould reduced rule is very suit for 2.5D woven composites. The whole failure progress for a sample with hole are simulated at the end of this paper.
Destabilizing Effect of Zirconia Products Caused by Aluminum
Authors: Tian Xiao Li , Xue Qun Hu , Xue Chong Bo
Published: February 2012

Thermodynamic analysis on destabilizing effect of zirconia products caused by aluminum is carried on by using material Gibbs free energy function, and then the experimental verification was tested by scanning electron microscope (SEM). The results show that: 1) aluminum reacts with calcium oxide, the stabilizer of zirconia, forming some sheet-like calcium hexaluminate. It results in the stabilizer loss and the volume destabilization of zirconia. 2) Aluminum reacts with magnesium oxide, the stabilizer of zirconia, forming some octahedral magnesia-alumina spinel. It results in the stabilizer loss and the volume destabilization of zirconia. 3) The destabilizing effect of zirconia caused by aluminum can be defined three layers, which are original layer, transition layer and reaction layer.
Antifungal Properties of Ag-SiO2 Core-Shell Nanoparticles against Phytopathogenic Fungi
Authors: Zheng Li Ping , Zhang Zhen , Zhang Ben , Wang Jian Wen
Published: February 2012

Silver nanoparticles have been extensively used as the anti-microbial agent in medicine. The present study addressed their antifungal potential against phytopathogenic fungi. Ag-SiO2 core–shell nanoparticles (Ag-SiO2 NPs) with an average size of 118.2 ± 4.6 nm were successfully prepared. The released Ag+ slowly through the outer porous SiO2 coating layer from the silver cores was detected in potato dextrose medium, reaching a peak value of 0.016 ppm around day 4. Ag-SiO2 NPs have displayed excellent antifungal effects against tested phytopathogenic fungi even at a low concentration of 0.5 ppm. The antifungal activity of these Ag-SiO2 NPs is not just the effect of dissolved Ag+ released from the nanoparticles. Our results suggested that the induced reactive oxygen species (ROS) by Ag-SiO2 NPs were involved in the effect of growth inhibition on tested fungi.
Low Loss Hybrid Dielectric-Metal-Dielectric Waveguides for Sub-Micron Mode Confinement and Efficient Directional Coupling
Authors: Yang Mo , Song Jin Cheng
Published: February 2012

In this paper, we present the design of a novel hybrid dielectric-metal-dielectric waveguide, which consists of a metal stripe sandwiched between low-high dielectric layers. Its modal characteristics are investigated using the finite element method at the telecom wavelength. Simulations show that the dielectric contrast near the metal stripe results in a strongly confined hybrid plasmonic mode with sub-micron mode size and low propagation loss. The effects of geometrical parameters are analyzed systematically and the properties of directional couplers based on such hybrid waveguide are also investigated. The proposed structure could be useful candidates for various integrated optical devices and enable many applications such as electro-optic modulation, switching, sensing and more.
Fabrication and Characterization of ZnO-Based Nano Hetero Structure by Using a 2-Step Hydrothermal Growth Method
Authors: Chen Tron Min , Uang Kai Ming , Lin Shu Kuo
Published: February 2012

In this study, we reported the fabrication and characterization of a nano hetero junction (NHJ) structure which is synthesized by a 2-step hydrothermal growth (HTG) method. The zinc oxide (ZnO) nano rods (NRs) were grown by the 2-step HTG onto p-type nickel oxide (p-NiO) film e-beam deposited glass substrate to form n-ZnO-NRs/p-NiO NHJs. The electrical properties of the n-ZnO-NRs/p-NiO NHJs show a rectifying behavior of a p-n junction. The optoelectronic properties of the n-ZnO-NRs/ p-NiO NHJs under UV light (366 nm) light with good sensitivity were presented.
Low Temperature Sintering of BaO–ZnO–TiO2 Ceramics for LTCC Applications
Authors: Yu Sheng Quan , Sun Shu Meng , Tang Bin , Zhang Shu Ren
Published: February 2012

In order to develop a new middle dielectric constant LTCC materials, the effects of BaO–ZnO–TiO2–B2O3–SiO2(BZTBS) and/or BaCu(B2O5)(BCB2) on the phase composition, microstructure and microwave dielectric properties of BaO–ZnO–TiO2 ceramics were investigated by solid-state reaction. It was found that BCB2 mainly worked as sintering aids to lower the sintering temperature and the key role of BZTBS was to affect the phase composition in favour of showing a high Q×f value. Therefore, when 5wt% BZTBS+6wt% BCB2 were co-doped, the sintering temperature was down to 850°C, and the microwave dielectric properties were improved significantly because the densification and grain size distribution were not only improved but also the phase composition was controlled. At last, this ceramics sintered at 850°C for 0.5 h showed good microwave dielectric properties: εr=28.4, Q×f=8,030 GHz and τf=2 ppm/°C. Also, it was compatible with Ag electrodes, so it was a promising candidate for LTCC application.
Influence of La2O3-Doping on Dielectric Properties of Ba(Ti, Sn)O3 Ceramics
Authors: Li Yuan Liang , Ma Xue Gang , Wang Ran Ran , Cui Zhi Min , Chen Ying , Chen Chen , Zhang Qing Jun
Published: February 2012

Ba(Ti0.95Sn0.05)O3 ceramics were prepared using BaCO3, SnO2 and TiO2 et al as crude materials, La2O3 as dopant, and their dielectric properties are investigated. The morphology analysis of sintered samples was conducted by SEM. It is found that for 0.1 wt% La2O3 doped BTS5 ceramics sintered at 1290oC has the highest dielectric constant. It can also be seen that the samples sintered at 1260oC have higher dielectric loss, which can result from the existence of the pore. Meanwhile, in the terms of dielectric loss, 0.1 wt% La2O3 doped BTS5 ceramics has lower value and the dielectric loss is more stable with temperature varying.
Decisional Autonomy of Approach and Landing Phase for Civil Aviation Aircraft using Dual Fuzzy Neural Network
Authors: Xu Kai Jun
Published: February 2012

This paper presents the dual fuzzy neural network, designed the decisional autonomy flight controller for civil aviation aircraft in approach and landing phase. Real-time learning method was applied to train the neural network using the gradient-descent of an error function to adaptively update weights. Adaptive learning rates were obtained through the analysis of Lyapunov stability to guarantee the convergence of learning. Conventional automatic landing system (ALS) can provide a smooth landing, which is essential to the comfort of passengers. However, these systems work only within a specified operational safety envelope. When the conditions are beyond the envelope, such as turbulence or wind shear, they often cannot be used. The objective of this paper is to investigate the use of dual fuzzy neural network in ALS and to make that system more intelligent.
Effect of Rb+ -Doping on the Crystallization, Phase Transition and Photocatalytic Activity of Nanosized TiO2 Catalyst
Authors: Ni Zhao Hui , Kou Xiao Li , Ding Xin Yu , Ge Cun Wang , Jing Xiao Hui
Published: February 2012

In order to study the ion effect on titania phase structure, crystallite size, and photocatalytic activity, Rb+-doped TiO2 nanoparticles were prepared via a modiﬁed sol-gel method and characterized by means of X-ray diffraction, Energy Dispersive X-rays spectroscopy and transmission electron microscopy. The photocatalytic activity of the elaborated powders was studied following the degradation of methyl orange. The results indicate that doping Rb+ increases the BET surface area of TiO2 crystals, decreases the crystal size, reduces the diminishing rates of surface area with increasing calcinations temperature, raises the temperature at which anatase changes into rutile phase, and so significantly increases the photocatalytic activity of TiO2. The kinetics of the methyl orange degradation fits Langmuir-Hinshelwood kinetics model well.
Comparison of Surface Electrochemical Properties between Purple Rocks and their Derived Soils as Related to Pedogenesis
Authors: Hu Fei Nan , Wei Chao Fu , Du Jing
Published: February 2012

Soil surface electrochemical properties may have an important effect on soil fertility and genesis. Few researches are available on the changes of surface electrochemical properties of purple soils during the pedogenesis. In present work, four purple rocks and their derived soils under arable, orchard, forest and grass were collected to determine surface electrochemical properties including surface specific area, surface charge quantity, surface charge density, electric field strength, and surface potential using the kinetic method. The results indicated that soil surface specific area and surface charge quantity of soils were both significantly higher than their parent rocks. There were similar trends in surface potential, surface charge density and electric field strength of soils and parent rocks, soils derived from Shaximiao Formation (J2s) and Suining Formation (J3s) were higher than those of parent rocks, whereas the reverse trends existed in Feixianguan Formation (T1f) and Penglaizhen Formation (J3p). At the same time, surface potential of soil samples collected from four sites with different land utilization, i.e., Arable, Orchard, Forest and Grass, were determined to illustrate the various trends of soil electrochemical properties change. Under different land use patterns, the descending orders of soil surface potential in Shaximiao Formation (J2s) and Suining Formation (J3s) were both as follows: orchard > forest > arable > grass; the order in Feixianguan Formation (T1f) and Penglaizhen Formation (J3p) were as: orchard > forest > grass > arable. On the other hand, the value of soil surface charge quantity was increased with clay content and soil acidity because of the intensive physical weathering and slight chemical weathering. Therefore, the surface electrochemical properties may have some agreements with the weathering extent of the purple soils. Soil surface potential, surface charge quantity, surface charge density, electric field strength, and surface specific area could be employed as reference criteria for pedogenesis of purple soils.
Test and Research on Ratchet Effect of 16 Mn Steel under Cyclic Loading
Authors: Xiao Guang Hong , Xiang Yang Kai , Jia Xiao Lei
Published: February 2012

The uniaxial and multiaxial non-proportional cyclic experiments of 16Mn steel under stress-control were carried out using MTS809 Series machine and Teststar control system .The influence of stress amplitude, mean stress and their loading history on uniaxial and multiaxial ratcheting is studied.
Frequency Reliability Robust Optimization for Rotor System
Authors: Su Chang Qing , Li Le Xin
Published: February 2012

The material properties and geometry of rotor system are random parameters because of the manufacturing environment, manufacturing and installation errors and other factors. Based on the reliability design theory, the reliability sensitivity technique and the robust design method, the frequency reliability robust optimization method of rotor system is extensively discussed. The frequency reliability sensitivity is added to the reliability-based optimization design model of rotor system. The frequency reliability robust design is described as a multi-objection optimization. The method presented provided the theoretic basis for the reliability robust design of the rotor system. A numerical example demonstrated that the proposed method is effective.
Research on Reliability Calculation Method of Series System Based on Statistical Analysis
Authors: Jia Yun Fei , Cai Wei
Published: February 2012

In order to reducing the degree of calculated difficulty, statistical procedure is used to solve the reliability calculation problems. The hypothesis of space independence and time independence of series system is brought forward, then reliability problem of repairable equipment can be regarded as reliability problem of non-repairable system, efficient solution can be gained by using statistical method.
An Empirical Analysis on Efficiency of Foreign-Invested Manufacturing Enterprises in Hubei
Authors: Wang Zhao Yang
Published: February 2012

Using non-parametric Data Envelopment Analysis (DEA) method, the paper evaluates the efficiency of foreign-invested manufacturing enterprises in Hubei. The results indicate that the efficiency of foreign-invested manufacturing enterprises in Hubei is not high, and the trend is increasing returns to scale.Finally,through the projection analysis, the paper puts forward the countermeasure.
Coupled Thermal-Structural Analysis of Mechanical Seal
Authors: Liu Liang , Liu Zheng Lin , Wang Jun , Peng En Gao
Published: February 2012

Based on ANSYS software and combined with the theory trends on stern shaft seal performance, the steady-state thermal structure coupling and transient thermal structure coupling analysis of stern shaft mechanical seal had been carried on. It showed that the transient thermal structure coupling analysis was more close to the actual condition of stern shaft seal. The result of transient state analysis indicated the thermal-mechanical effect on seal face during starting, and showed that the contact area was decreased especially the temperture rise rapidly inside of the seal.
Full Shafting-Based Elastohydrodynamic Lubrication Simulation for Main Bearings of Marine Diesel Engine
Authors: Xing Hui , Zhang Hui , Wu Qili , Duan Shu Lin
Published: February 2012

To predict and analyze accurately the lubrication characteristics and its influencing factors of main bearing for large low-speed two-stroke marine diesel engine, based on EHD lubrication model of dynamically loaded bearing, coupling simulation between EHD and MBD for main bearing of marine diesel engine was carried out. Systemic models were established separately considering the independent crankshaft of diesel engine and the full shafting of propulsion power plant. Main bearing load, peak oil film pressure, oil film pressure distribution, MOFT and orbital path in one working cycle under rated working conditions were investigated, and simulation results were compared based on both models. The results show that, if the impact of full shafting was considered, the lubrication characteristics of No.8 main bearing changed significantly, the lubrication characteristics of other main bearings were similar as the simulation results of the independent crankshaft model.
The Research on Wearing Pressure Comfort of Knitting Underwear
Authors: Liu Yan Mei
Published: February 2012

The specification of standard body knitting underwear is designed according to the elastic of the knitting fabric, then the body fitting experiments are implemented on the sample clothing. The assessment has done for different elastic and different size knitting underwear by using mental scale. The specification of knitting underwear is revised to obtain the most suitable for the body fitting according to the result of the assessment.
Improved EEMD Method Research
Authors: Zhang Mei Jun , Han Si Chen , Wang Chuang , Li Shu Guang
Published: February 2012

In order to correct the endpoint effect and modal aliasing phenomenon in EMD and EEMD, improved EEMD is put forward in this paper. on the basis of the cause of the endpoint effect,the improvement measures are proposed. The pulse interference and noise pollution is suppressed by threshold noise reduction.The overshoot and undershoot phenomenon is controlled by improving 3-spline interpolation to fit envelope. The endpoint effects is lessened by signal SVM prolongation.Compared with EMD and EEMD, not only the IMF false component is reduced, the modal aliasing avoided, and effectively the endpoint effect restrained, the distortion problem in the signal decomposition produces corrected in the results of simulation signal and the measured signal by the improved EEMD in this paper.
Estimation of Direction of Wavefront Propagation and Slowness Using Time Domain Wavenumber Analysis in Small-Size Dense Seismic Arrays
Authors: Liu Ping , Ma Hua , Zhang Xue Wei , Sun Xin Yu , Cao Fei
Published: February 2012

The time domain wavenumber analysis method can directly delay and align signals before the superposition of signals in the time domain. In this paper, estimating the direction of wavefront propagation and the slowness for seismic signals which pass through the small-size dense seismic array is described in detail. The earthquake recorder sample adopted from US Geological Survey Parkfield Dense Seismograph Array (UPSAR array) of the U.S is used for analyzing. The results indicate that, the direction of wavefront propagation cannot be determined rashly only by the connecting line of the earthquake epicenter to the seismic array. The accuracy of the apparent velocity and the direction of wavefront propagation calculated using vertical seismic recorders is higher in West-East direction and in North-South direction.
Stability Analysis of a Transverse Cylindrical Grinding Process
Authors: Yan Yao , Xu Jian
Published: February 2012

The stability of a transverse cylindrical grinding process is investigated in this paper. The workpiece is considered as a rotating damped hinged-hinged Euler-Bernoulli beam and the grinding wheel a rotating damped spring mass system moving along the workpiece. Called regenerative force, the contact force between the workpiece and the wheel is a functional equation related to both the current and previous relative positions between the workpiece and the wheel since the regeneration exists on the surfaces of both the workpiece and the wheel. The two distinct time delays presented in the regenerative force model are inversely proportional to the rotation speeds of the workpiece and the wheel respectively. For grinding stability analysis, the regenerative effects are considered as the key factors in inducing chatter vibrations in the grinding process. The grinding stability is numerically analyzed since two distinct delays being involved in the model makes the analytical analysis extremely difficult. Finally, the grinding stability analysis is verified by numerical simulation.
Dynamic and Control of Vibratory Road Roller Based on Magneto-Rheological Semi-Active Damper
Authors: Liu Shao Na , Yan Shi Rong , Li Shu Wei , Zheng Yao Gang
Published: February 2012

Comfort of the vibratory road roller is an important research title. A 2-DOF non-line model is set up, which is more close to the actual situation of the vibratory road roller. A simulation using MATLAB/SIMULINK is carried out to validate this model and study its dynamic characteristic and analyze the motion laws of its housing and wheel. A kind of Magneto-rheological (MR) damper is designed which has been widely used in automotive and bridge damping in recent years, and applied to a vibratory road roller to control it. The control strategy uses fuzzy control. The results indicate that the damping performance of the vibratory road roller which applied MR damper is improved remarkably.
Research on Active Vibration Control of Simply supported Beam Base on Piezoelectric Actuator
Authors: Wen Jian Ming , Ma Ji Jie , Jiang Yong Hua , Cheng Guang Ming , Zhang Zhong Hua
Published: February 2012

The active vibration control is becoming an effective mean to solve the vibration control problems of the aerospace and other fields. This paper builds up the active vibration control system of simply-supported beam based on piezoelectric actuator. The mathematical model of simply supported is derived and the displacement response curve of the beam is obtained by simulation analysis through MATLAB software. The vibration tests of simply supported beam under an initial disturbance and continuous incentives were carried out, according to the experimental results it can be concluded that the proposed control method has a suitable and efficient performance for vibrations control.
Grey Correlation Analysis-Based Comprehensive Dynamic Characteristics Evaluation of NC Machine Tool
Authors: Zhu Jian Min , Li Hai Wei , Huang Zhi Wen
Published: February 2012

The dynamic characteristics of the NC machine are the important technical indicators of NC machine performance, and the precision of existing machine's dynamic characteristics evaluation analysis that based on structural dynamics modeling and simulation is poor. For this problem, this paper presents NC machine dynamic characteristics evaluation methods based on Grey Correlation Analysis. This method, by measuring the vibration signal of feature points in NC machine and making 1/3 octave spectrum analysis for vibration signal, can obtain the characteristics data sequence of vibration signal. Through the grey correlation analysis method, calculate the relevancy between the characteristics data sequence of each vibration signal and that of ideal dynamic characteristics, and quantitatively evaluate the dynamic characteristics of machine tools according to the size of the grey correlation. Took three same type NC milling machines as study objects, designed the cutting vibration resistance experiments, used this paper's method for the evaluation analysis of the comprehensive dynamic characteristics of NC milling machine, and obtained the evaluation results which is in line with the actual dynamic characteristics of machine tools, and verified the evaluation method of comprehensive dynamic characteristics that proposed in this paper.
Internal Friction Peaks in a Porous CuAlMn Shape Memory Alloy
Authors: Wang Qing Zhou , Cui Chun Xiang , Yan Na Jun , Han Fu Sheng
Published: February 2012

Internal friction behavior of a porous CuAlMn shape memory alloy was examined. Two internal friction peaks appear at around 350 oC and 380 oC during the first heating process in the as-quenched specimen, but they disappear during the second or more heating process. Two other internal friction peaks are found at around 150 oC and 325 oC from the second heating process. Correlated mechanisms of the peaks are discussed.
Sound–Structure Coupling Analysis of Multi-Flexible Plates Enclosure
Authors: Li Zhi Chen , Chen Nan , Gu Lin Ning
Published: February 2012

The research on enclosure noise control is caused more and more attention. The key of noise control is to grasp physical essence about enclosure sound-structure coupling field. The research work has been carried out on a enclosure model of two simly supported flexible plate and four rigid plates. The research is focused on sound –structure coupling field analysis of the enclosure when applying primary forces on two flexible plate simutaneously. At the constraint condition of average acoustic potential energy(AAPE) formulars of enclosure sound–structure coupling field is derivated. The simulation show the follow conclusion: first, the wave energy transfer path is from primary force flexible plate to acoustic cavity, then to another flexible plate, and then feedback to acoustic cavity. Second, when structural natural frequences are the same as acoustic natural frequencies of the enclosure, the noise reach the maximum value. The third, when applying primary force on Plate a and on Plate b simutaneously, the wave energy transfer path and The relation of sound-structure coupling are more complex than only applying force on one plate.
Research on the Decoupling Control Algorithm of Full Vehicle Semi-Active Suspension
Authors: Chen Jian Guo , Cheng Jun Sheng , Nie Yong Hong
Published: February 2012

Vehicle suspension is a MIMO coupling nonlinear system; its vibration couples that of the tires. When magneto-rheological dampers are adopted to attenuate vibration of the sprung mass, the damping forces of the dampers need to be distributed. For the suspension without decoupling, the vibration attenuation is difficult to be controlled precisely. In order to attenuate the vibration of the vehicle effectively, a nonlinear full vehicle semi-active suspension model is proposed. Considering the realization of the control of magneto-rheological dampers, a hysteretic polynomial damper model is adopted. A differential geometry approach is used to decouple the nonlinear suspension system, so that the wheels and sprung mass become independent linear subsystems and independent to each other. A control rule of vibration attenuation is designed, by which the control current applied to the magneto-rheological damper is calculated, and used for the decoupled suspension system. The simulations show that the acceleration of the sprung mass is attenuated greatly, which indicates that the control algorithm is effective and the hysteretic polynomial damper model is practicable.
Fault Diagnosis of Bearing Based on the Ultrasonic Amplitude Histogram
Authors: Su Lian Cheng , Shi Yan E , Li Xiao Li
Published: February 2012

The bearing of rotating machine often fails due to the frictional forces of rolling element, such frictional forces often generate a series of ultrasound, and that is to say, there must be some necessary relationships between the faults of rotating machinery equipment and the ultrasound from the equipment. In this paper, the histogram method which is the simplest method in statistics is used to analyze the ultrasonic signals. Through the analysis, the bearing faults could be preliminarily diagnosed. A verification research with respect to vibration method is carried out to analyze the effectiveness and superiority of ultrasonic method by using the histogram. Extensive experiments have been performed in a bearing vibration measuring instrument, and the results indicated that the fault diagnosis method based on the ultrasonic amplitude histogram is more useful than the method based on the vibration amplitude histogram. In addition, it is more sensitive and more effective than the method based on vibration amplitude histogram.
Linear Stability Analysis of Marangoni Effect on Desorption Liquid Layer
Authors: Chen Jie , Zeng Ai Wu , Yu Li Ming
Published: February 2012

Stability of static liquid layer in mass transfer process accompanied by concentration-driven Marangoni effect was modeled and analyzed by utilizing the linear stability theory. The critical condition of the onset of the Marangoni convection was obtained. It is found that the liquid layer becomes more unstable with the increase of the Schmidt number, and it becomes the most volatile when the Biot number is about 0.85. The critical time to mark the onset of Marangoni convection can be predicted with the established model. The research results show that the concentration gradient is the main factor to initiate the Marangoni convection.
Tooth Root Stress Analysis of Gear Processed by Full Radius Hob Based on ANSYS/LS-DYNA
Authors: Ma Yong , Dong Xin Hua , Huang Qi
Published: February 2012

According to principle of hobbing, this paper set up accurate model of gear processed by full radius hob based on ANSYS/LS-DYNA software. A dynamic contact analysis of gears are completed and we gets stress distribution of tooth root as time changes, making foundation for future study and optimization design of full radius hob.
Suspension Design and Research for Electric Vehicles with Independent Steering and Driving
Authors: Dong Zhu Rong , Deng Zhi Jun , Ren Shao Yun , Qiu Hao , Qi Tom Zi Ming
Published: February 2012

A new suspension using double-wishbone and coil spring type structure is designed for four-wheeled independent steering and driving electric automobile. Firstly, the simplified geometric model is built, and the ADAMS is used to set parametric model. Optimization design was carried out upon the suspension guiding mechanism. The design method of suspension spring stiffness and damping coefficient is presented. And the reasonability of the method is verified by simulation and experiment. The created suspension prototype complies with the design requirements. The suspension test-bed is designed, which can complete t various detection experiments during designing.
Experimental Study on the Design of Pressurization System in High-Rise Buildings
Authors: Zhang Jing Yan
Published: February 2012

By experimental study, a design for pressurization system in a multiple injection system with upper injection is discussed and the velocity distribution in a shaft is educed by the approach method. This velocity has a relation with volume flux from pressurization fan, section area of pressurization shaft and height of shaft. In factual situation, there is an important assistant meaning on researching the design of pressurization system in high-rise buildings.
Reliability Analysis for Plunger Pump Fluid End Based on Random Finite Element Method
Authors: Huang Tian Cheng , Zhou Si Zhu , Yuan Xin Mei
Published: February 2012

In order to confirm the structure strength reliability of the plunger pump fluid end, the 3-D parametric finite element model is built according to its structure characteristic, the finite element analysis is carried through the finite element analysis software, and the reliability analysis is carried by ANSYS/PDS. The analysis result shows that 500 times sampling simulation suffices the need of precision. The result of sensitivity analysis is shown that the main influencing factor is material yield limit of plunger pump for the reliability, the second is the internal pressure of fluid end, and the elastic modulus and Poisson ratio have less effect for the reliability. The reliability of fluid end is 95.6% when the material yield limit of plunger pump is normal distribution. The reliability of fluid end is up to 100% when the material yield limit is constant, so the material yield limit is ensured not change when the fluid end is designed and manufactured.
Modularization of Electromechanical Products’ Design Knowledge
Authors: Zhang Yi , Li Wen Qiang , Li Yan
Published: February 2012

Abstract. In the process of electromechanical products innovative design, a lot of domain knowledge is involved. Present method of knowledge classification and organization based on subjects has limited its integrated use. Thereby, a new method based on functional attributes of knowledge is proposed in this paper. Principles of clustering based on the characteristics of domain knowledge are also put forward. At last, sub-modules are further detailed and a tree of domain knowledge is formed. This method is conducive to knowledge reuse, update and retrieval, and lay a good foundation for the establishment of a database.
A Solar Cell Made by a Hybrid Film of P3HT and Cubic-Like PbS
Authors: Wang Peng , Fan Li Bo , Zhang Zhen Hua , Lei Yan , Zhang Yan Ge , Li Pin Jiang
Published: February 2012

Cubic-like lead sulfide (PbS) films were in situ fabricated on lead (Pb) foil on a large scale by solvothermal method. Ethanol and ethylenediamine were used as the solvent. The films were characterized by X-ray diffraction (XRD), Scanning electron microscopy (SEM), absorption and the Fourier transformation-infrared (FT-IR) spectra. A solar cell was made by the hybrid film of P3HT and cubic-like PbS. The solar cells are photosensitive in a large spectral range (visible and near infrared regions). The cell with the area of 0.20 cm2 without any special treatment has shown the values of open-circuit voltage (Voc) of 250 mV and short circuit current (Jsc) of 0.01 mA/cm2 with the efficiency of 0.01 % and the fill factor (FF) is 0.36 under illumination intensity of 100 mW/cm2.