bluuebunny/crossref_metadata_2025 huggingface dataset:
Power Modulated Plasma-Polymerized Anti-Fingerprint Transparent Protective Coating with a Gradient Composition
Authors: Chang Shiun Wei , Chen Chun Ming , He Ju Liang
Published: June 2012

In this study, the multi-functional gradient pp-F:TMDSO coating had been successfully developed via power-modulated plasma polymerization. The plasma power and gas flow rate of tetramethyldisiloxane and tetrafluoromethane were well controlled to implement a gradient coating to achieve the mechanical property, transmittance, hydrophobic and oleophobic properties. The coating shows that the pencil hardness of 3H and Scotch tape adhesion of 5B demonstrating the protective function of the coating. The water and oil contact angle are 105° and 31.7° respectively. The coated specimen remains an optical transparency of 90% close to bare PC material. Comparing with the commercialized screen protectors, this coating shows superior protective and anti-fingerprint performance.
Prediction of Hot Tearing Susceptibility for Mg-Zn-(Al) Alloys
Authors: Zhou Le , Liu Zheng , Huang Yuan Ding , Mao Ping Li
Published: June 2012

It is importance to be able to predict the hot tearing tendency for multicomponent magnesium alloys. Hot tearing is one of the most common and serious defects that occurs during the solidification of commercial magnesium alloys. Clyne and Davies correlated the susceptibility-composition relationship in binary systems based on the concept of the existence of critical time periods during the solidification process when the structure is most vulnerable to cracking. The present work first evaluates the hot tearing susceptibility (HTS) of binary Mg-Zn system using thermodynamic simulations based on Clyne-Davies’ model, a typical “λ shape” curve is obtained. And then a scaling factor is investigated to obtain the internal-consistent cracking susceptibility coefficient for further investigating the addition of aluminum on the HTS in the ternary Mg-Zn-Al system. The predicted hot tearing tendencies is consistent very well with the experimental results of the Mg-Zn binary system and Mg-Zn-Al ternary system.
Development of Degradable Mg-RE Based Biomaterials
Authors: Peng Qiu Ming , Dong Han Wu , Tian Yong Jun , Zhang Hong Jie
Published: June 2012

Mg alloys were increasingly attracting attention as a potential implant biomaterials because that there will be no need for a second surgery. However, the majority of conventional Mg alloys have been developed for automotive components and were not suitable for Mg based implants. In this paper, a new Mg-RE based materials was developed for implant biomaterials, avoiding the negative influences of previous systems. Microstructure, mechanical and corrosion properties were investigated. The result exhibited that the mechanical properties and degradable rate were sufficient to satisfy the requirement of Mg-based implants. Furthermore, the deformability of the alloy was also investigated. The fine stent pipe was prepared by cold-drawing technology. The primitive results demonstrated that this new alloy was an ideal stent materials.
Dynamic Tensile Characteristics of DP600 Steel Sheets for Automotive Applications
Authors: Dong Dan Yang , Liu Yang , Wang Lei , Liu Chang Sheng
Published: June 2012

To reduce fuel consumption and greenhouse gas emission, dual phase (DP) steels have been considered for automotive applications due to their higher tensile strength, better initial work hardening along with larger elongation compared to conventional grade of steels. In such applications, which would create potential safety and reliability issues under dynamic loading, the mechanical behavior of DP steel considering the strain rate must be examined. In the present study, the dynamic tensile behavior of DP600 steel sheets was investigated using a high-speed tensile testing machine at various strain rates. And the quasi-static tensile testing was also conducted on the steel to understand the effect of the strain rate on the tensile property. The fracture mechanisms of the steel were also analyzed. The results show that the mechanical properties of DP600 steel are noticeably influenced by the strain rates. As the strain rate increases, the strength of the steel increases and the obvious yield phenomenon can be observed when the strain rate is above 0.01 s-1. The fracture elongation of DP600 steels decreases with increasing strain rate from 0.001 to 1 s-1, then increases up to the strain rate of 100 s-1 and reaches the lowest value at the strain rate of 1000 s-1. DP600 steel sheet exhibit typical ductile fracture characteristics with dimples morphology of the facture surface when tensile deformed at various strain rates.
Effect of Li Source on Charge/Discharge Performance of LiFePO4
Authors: Liu Hong Quan , Hao Fei Xiang , Gu Yi Jie , Chen Yun Bo
Published: June 2012

LiFePO4 has been considered as the most promising positive electrode due to its low cost, high theoretical capacity, stability and low toxicity, all highly required in vehicle applications. In this work, LiFePO4 compound was synthesized by the solid carbothermic reduction reactions with different Li resource. The pure LiFePO4 phase was confirmed for all samples by analysis of the XRD results. The different morphologies were obtained due to different Li resources. The potential plateau of all samples is in the range from 3V to 4V. The sample (LiCO3 as the Li resource) has a higher discharge capacity of 118mAhg−1 at 0.2C 20% greater than that of the sample (LiOH as the Li resource). The reason comes maybe from nano pore characteristics, which reduce Li ion diffusion distance, and increase the utilization efficiency of material.
Encapsulated Phase Change Materials and their Applications in Buildings
Authors: Yang Rui
Published: June 2012

Energy consumption of buildings has exceeded 25% of total social energy consumption and new techniques and new materials are greatly demanded in buildings in order to save the energy. As an important clean renewable energy resource, solar energy is expected to be used in buildings instead of traditional energy including petroleum and coal. Phase change material (PCM) can absorb solar energy, transfer it to heat, and store it through phase change process. When needed, the energy absorbed can be released. By this way, the room temperature in a building can be maintained in a comfortable region without input of extra energy. Therefore, PCM is a promising material for energy saving and will be widely used in various applications as well as buildings. In this paper, three kinds of encapsulated phase change materials, i.e., shape-stabilized PCM (FSPCM), absorbed PCM and PCM microcapsule are introduced. Their preparation methods and physical properties as well as typical applications are compared.
Improvement of Adhesion Strength of Electroless Nickel Coating on AZ91D by Anodized Oxide Interlayer
Authors: Hsu Hsien Ta , Yang Tsong Jen
Published: June 2012

Nickel-oxide duplex coatings were successfully deposited on magnesium alloy (AZ91D) by anodizing and electroless nickel-phosphorus plating processes. The anodizing interlayer was used to increase the adhesion strength of Ni-P layer. The electroless Ni-P coating enhances the corrosion resistance of the anodic oxide layer. Specimen of AZ91D magnesium alloy was polished firstly. The anodizing process was preceded in alkaline anodizing solution at 24 °C, and the bath voltage maintained at 70 volts for 2 hours. Successive electroless Ni-P plating was used to achieve the sandwich structure. The surface morphologies of the coatings were observed by field-emission scanning electron microscopy (FE-SEM). The adhesion strength was measured by pull-off tester. The electrochemical behavior of coatings with corrosion resistance in 3.5 wt.% NaCl solution was evaluated by potential polarization curve. The experimental results showed that the adhesion strength of directly deposited coating and duplex coating were 115.4 kgf/cm2 and 142.2 kgf/cm2, respectively. The adhesion strength of coatings on AZ91D magnesium alloy was improved by the synergistic effect between anodized magnesium oxide and Ni-P layer in duplex coating.
Influence of Sn Content on Microstructure and Mechanical Properties of Ti-35wt%Nb Alloy
Authors: Dai Shi Juan , Chen Feng , Yu Xin Quan , Zhang You Fa
Published: June 2012

The influence of Sn content on the microstructure and mechanical properties of Ti-35Nb-XSn (X=0, 3, 6, 9) alloy was investigated in this paper. It is shown that Ti35Nb alloy is composed of β, α and α” phases after solution treatment at 800°C. The α" and α phases disappear and single β phase is obtained with the addition of Sn element. The strength of the alloys increases and the elongation decreases with increasing Sn content. Meanwhile, it is found the addition of Sn element makes the elastic moduli of the alloys much lower than that of Ti35Nb alloy.
Braking Performance Analysis for Light Duty Vehicle Matched with Braking Force Regulator
Authors: Xie Fei , Wang Jian Hua , Wang Yun Cheng
Published: June 2012

Braking performance of fixed distribution of braking force for a light duty vehicle was analyzed. On the basis of analyzing the pressure regulating characteristics of braking force regulator and the ideal braking pressure distribution of a light duty vehicle, the reasonable matching method of inertia proportioning valve was provided. After theoretical computation and road test, the results showed that braking performance was obviously increased and braking stability and safety was improved.
Fatigue Life of Taper Roller Bearings in Drive Rear Axle Main Gear Reducer
Authors: Zhang Yong Qi , Tan Qing Chang , Li Jian Gang , Zhang Kuo
Published: June 2012

Taper roller bearings are important parts of drive rear axle main gear reducers, and their work property affect behavior of the reducers.The roller bearings are obtained under applied load and inertia force that affects both meshing contact of the gears and raceways of the bearings. The influence is analyzed in this paper to improve the service life of the roller bearings by finite element method in this work. Firstly, a finite element model of roller bearings is established.Stress fields in the roller and the raceway are calculated by adding load and solving. Then,obtaining the maximum stress of the bearings, and the maximum stressand displaced shape are showed. Finally, the fatigue life of the bearings are analyzed by the obtained the maximum stress .
Modeling of Flow Stress of Spray-Forming FGH95 Superalloy under Hot Compression
Authors: Guo Biao , Zhang Sui Cai , Ge Chang Chun
Published: June 2012

The hot compressive deformation behavior of the superalloy was investigated at the temperature range from 1050 to 1140 and strain rate range from 0.01 to 10s-1 on Gleeble-1500 thermal simulator. Utilizing hyperbolic sine function and introducing the strain with 4th order polynomial fitting, the constitutive equations of flow stress of spray-forming FGH95 superalloy at high temperature were established. The results show that during the hot compression deformation of the superalloy, the characteristics of dynamic softening were observed, and flow stresses decrease with increasing temperature and decreasing strain rate. The flow stress of the superalloy predicted by the proposed models with 4th order polynomial fit agree with the experimental value well, and the average relative error is 3.64%.
Linear Stability Analysis of Space Compressive Structure of the Inverted-V Combinatorial Jib
Authors: Li Wen Jun , Xiong Xiao Lei , Dai Xi Wei , Zhou Qi Cai
Published: June 2012

In order to study the problem of stability-losing load of the super-big crane jib with the inverted-V shape, this paper completed theoretical analysis, simulation and verification. Based on the stability-losing load formula considering shearing-force influence of compressed solid column, the limit load formula of the inverted-V combinatorial jib was obtained. Then, the method of force was applied to getting the shear angle formula of the inverted-V combinatorial jib under unit shear load. After using the proved formulas and software SAP2000 in linear buckling analysis of 28 combinatorial jibs consisting of two kinds of typical-section rods, the results demonstrated that: As for combinatorial structure consisting of cross-shaped web members, the error between results of the proved limit load formula and finite element calculation was within-5% when the aspect ratio of the inverted-V combinatorial jib was above 3.
Heat Conduction Equation Finite Volume Method to Achieve on MATLAB
Authors: Xiao Xiao Feng , Xue Qiong
Published: June 2012

Diffusion only, two dimensional heat conduction has been described on partial differential equation. Based on Finite Volume Method, Discretized algebraic Equation of partial differential equation have been deduced. different coefficients and source terms have been discussed under different boundary conditions, which include prescribed heat flux, prescribed temperature, convection and insulated.. Transient heat conduction analysis of infinite plate with uniform thickness and two dimensional rectangle region are realized by programming using MATLAB. It is useful to make the heat conduction equation more understandable by its solution with graphical expression, feasibility and stability of numerical method have been demonstrated by running result.
Design on Cutting Die of Connection Plate
Authors: Liu Jian Hua
Published: June 2012

The conventional manufacture method is cold machining for thin board type parts, which has characteristic of process trival, energy consumption, long production period and the processing process easy to produce the deformation. To overcome these shortcomings, it usually was manufactured by stamping technology. So the cutting mould was designed on the analysis of the forming process for the type of parts, and adopted the unloading tendered a leaned way. Practice has proved that cutting the workpiece precision and quality is higher, cutting efficiency is high, the product quality completely meet the application requirements.
Simulation and Matching for the Powertrain System of Saloons
Authors: Zang Jie , Zhang De Sheng , Sun Yuan Tao , Lv Song Tao
Published: June 2012

Reasonable match of the powertrain system is an optimized design process, which makes the saloons fuel economy low and power performance good. This document simulates the complete vehicle performance model of a specified manual transmission FF saloon by means of CRUISE. Establish 4 kinds of simulation task, select 3 kinds of engine whose displacement are 1.3 liters, 1.1liters and 1.0liters, 4 kinds of transmission and 4 kinds of main decelerator, calculate the power performance and fuel economy of saloon with 48 different kinds of alternative schemes on transmission system by CRUISE and analyze all the simulation results. A synthetic weighting index evaluation system of complete vehicle performance is created, which contains the design of evaluation indices and weighting indices. Analyze the weighting indices to obtain 5 design schemes which are superior to others. It offers reference data for saloon performance.
Design of a Bidirectional Telescopic In-Pipe Robot
Authors: Shang Jian Zhong , Cheng Chen , Qiao Jin Wei
Published: June 2012

Millions of miles of pipeline are carrying fluent energy for our daily life, including water, natural gas, crude oil and nuclear materials. Micro in-pipe robot offers an effective technical method for pipe inspection and maintenance. A new bidirectional telescopic in-pipe robot was presented in this paper. In the first place, the whole structure of the in-pipe robot was described, illustrating its functions of motion principle and telescopic mechanisms, respectively. Then the inverting discipline and the driving force of mechanisms were analyzed in detail. The supporting lead screw nut was selected according to robots characteristic requirements, and its structural stability requirements were met after a series of verification. In the end, the buffer spring that satisfied with the restriction analysis was successfully designed.
Under the Elastic Supporting the Gear Transmission Dynamics Modeling and Simulation Analysis
Authors: Chen Geng Shun
Published: June 2012

In order to accurately get gear transmission system dynamic characteristics of transmission shaft for discrete processing. Numerical simulation gear meshing internal dynamic incentive, the improved gear pair of dynamic model for computing; At the same time, the simulation of rolling bearing in contact with the dynamic characteristic of the lubrication, consider the gearing mesh time-varying characteristic, the drive shaft bending-torsional coupling and supporting elastic establish single grade gear transmission prototype model. The simulation results show that different supporting conditions would lead to the simulation result differences, the elastic supporting more actual.
UG Software CAD/CAM Technology in Shark Model Processing Application
Authors: Zhang Fei , Wan Jin Gui
Published: June 2012

The first use of UG modeling tool to complete the shark 3D modeling; then using UG software to complete the automatic programming automatic programming function, and generates 3 axis machining program, then use the Yulong NC simulation software for NC machining simulation, validation procedures for the procedure to import CNC machine tool by processing, difficulty of shark processing fashion clamp design and processing.
Based on SolidWorks COSMOS 2.5 Tons, 4 m•s-1 High Speed Elevator Car Frame's Finite Element Analysis
Authors: Lu Feng , Bao Yuan , Zhou Xiang Guo , Wang Ya Jun
Published: June 2012

Car frame which is usually made of up beam, down beam, upright, cradle beam and bracer is bearing structure part which has a high intensity and stability requirements. Through research 2.5 tons, 4 high speed elevator's car frame, car frame's up beam, down beam, upright and cradle beam are designed by channel steel. In order to reduce the material cost of car frame based on the precondition that wouldn't influence frame's the stability and safety. First, Treating with the software SolidWorks establish 3D modeling. Second, by using the Plug-in COSMOS exert restriction, load and divide gridding meshing on the new car frame structure. After FEA gets stress cloud, strain cloud and safety factor cloud which provide the theory evidence of the new structure. The analysis of COSMOS shows the feasibility and stability of new structure. It can works on the condition that car frame keep steady and safe with material cost to lower, which has special significance on production practices.
Fixture System Based on Reconfigurable Lever Driven by Pneumatic Muscle
Authors: Qin Pei Liang , Zhong Kang Min
Published: June 2012

Based on the rod reconfigurable design idea, by changing the lever's shape and position, and tandem combination, we can create all kinds of force-magnifying institutions to meet different job requires. In this paper, use pneumatic muscle as drive component combined with reconfigurable rod institutions, fixture system has been innovated,the working principle of the fixture system are introduced, its calculating formulae of output power are also given. The fixture system adapted to the development of the greening trend, has broad application.
Modeling and Simulation for Feed Servo System in CNC Machine Tool
Authors: Nie Xue Jun
Published: June 2012

Feed servo system is an important part in CNC machine tool. In order to promote CNC machine tools precision, it is particularly important to enhance the control methods research on feed servo system. In this paper, different mathematical models of CNC machine tools feed servo system in different control modes are established, and their transfer functions are obtained, also the corresponding simulation models are constructed by using Simulink tools under MATLAB environment. Through simulating, the relationship between the systems parameters and the performance of servo system are obtained, some reliable theoretical basis can be achieved for improving and enhancing CNC machine tool servo system performance. Therefore some references for the performance optimization of feed servo system in CNC machine tool are provided.
The Principle Experiment of AlN Used as a Non-Absorbing Window Material of LDs
Authors: Liu Chun Ling , Hou Xue Yi , Yao Yan Ping
Published: June 2012

In order to reduce the catastrophic optical damage ( COD ) in the cavity surface of the traditional GaAs-LDs, this paper proposed the use of AlN film prepared as a non-absorbing window near the cavity surface of GaAs-LDs. In order to validate its feasibility, first of all, we prepared AIN film with different thickness on GaAs chips by reactive magnetron sputtering technology, and then, the PL spectroscopy of AlN / GaAs surface was acquired, the residual stress of the structure was calculated in accordance with the wavelength drift of GaAs intrinsic peak with the change in testing temperature.The experimental results show that the compression stress on GaAs chip is obvious when the thickness of AlN film is above 0.8 um. After the GaAs chip is subjected to compressive stress, the band gap will be widened,so the Eg of the active region near window area of GaAs-LDs will be wider than one of the active region inner the cavity, so that when the photons pass through this area, the absorption will be reduced, thereby forming non-absorbing window,therefore, the experimental validated that the AlN film used as the non-absorbing window of GaAs-LDs is feasibility.
Lab Simulation Study on Anti-Cracking Performance of Asphalt Concrete Overlays for Fatigue
Authors: Li Zu Zhong , Chen Shuan Fa , Liao Wei Dong , Yuan Rui Xing
Published: June 2012

Currently, researches on anti-cracking performance of asphalt concrete overlays on old concrete pavement for fatigue are still in the early stage of explorations and trials. The reflective crack simulation tests of bending and shearing styles with six asphalt overlays were carried out in order to evaluate the anti-cracking effects of different kinds of anti-cracking materials. It is suggested that Sampave modified asphalt mixture with independent development has excellent anti-cracking performance for fatigue, which provides an experimental reason for extending the anti-cracking technique in stress absorbing layers. Although anti-cracking performances of glass fiber grid and tricot geofabric reinforced composites are better, it is not as good as the one of Sampave. And the effect of paving asphalt concrete directly on old cement concrete pavement is worse.
Literature Review on the Development of Computational Software System for Creep Damage Analysis for Weldment
Authors: Tan Feng , Xu Qiang , Lu Zhong Yu , Xu Dong Lai
Published: June 2012

This paper reports a literature review on the development of computational software system for creep damage analysis for weldment. It starts with a brief review on the creep damage problem in weldment and the computational approach; identifies the need for computational approach and the un-availability of such computational system; further details on the preliminary development progress of a transfer programme and constitutive equation subroutines. This paper contributes to knowledge to the development of computational system for creep damage analysis.
Research on Physical Simulation of Virtual CNC Turning
Authors: Li Chun Lei
Published: June 2012

Sources and measurement of cutting forces are studied to establish the steady-state cutting force prediction model. Modeling of work piece machining error is analyzed, a simplified process coordinate system is established, and the mathematical solving model of machining error within the work piece is given. The cutting force due to work piece bending deformation is studied, a work piece deformation factor error model is established based on steady-state cutting force and the prediction simulation of cutting forces and machining error is achieved.
Experimental Study on the Response Characteristics of Oilcans under High-Velocity Fragment Impact
Authors: Chen Chang Hai , Zhu Xi , Hou Hai Liang , Zhang Li Jun , Tang Ting
Published: June 2012

To explore the deflagration possibility of the warship cabin filled with fuel oil under impact of high-speed fragments in the condition of room temperature, experiments were carried out employing the small aluminium oilcans filled with fuel oil. Response processes of the oilcans were observed with the help of a high-speed camera. The disintegration as well as flying scattering of the oilcans were analyzed. The reasons for atomization of the fuel oils were presented. Finally, the deflagration possibility of warship oil cabin was analyzed. Results show that the pressure inside the oilcan is quite great under the impact of the high-speed fragment, which makes the oilcan disintegration and flying scattering. Simultaneously, fuel oils inside the oilcans are atomized quickly followed by ejected in front and back directions. Under the same condition as in present tests, deflagration will not occur for fuel oils used by warships. Experimental results will provide valuable references for the deflagration analysis of warship fuel oil cabins subjected to the impact of high-velocity fragments.
Luminescence Properties of Zn2Si1+xO4+2x: Mn2+ in UV and VUV Region
Authors: Hao Yan
Published: June 2012

Phosphors Zn2Si1+xO4+2x: Mn2+(0x0.5) were synthesized through sol-gel process and their photoluminescence in UV and VUV region were investigated. At 254 nm excitation, the phosphor gives intense green emission (527 nm) and the luminescence intensity was enhanced with the increasing ofx. At 147 nm excitation, the optimum luminescence intensity occurred atx= 0.1 and the absorption of host became blue shift slightly, which could be related with the absorption of excess SiO2. The sample Zn2Si1.1O4.2had the highest emission intensity and it is 40% higher than that of Zn2SiO4:Mn2+.
Microstructural and Mechanical Properties of Autoclaved Saline Soil Brick: Part I: Microstructure Features
Authors: Qu Lie , Guo Lei , Yang Jiu Jun , Chai Shou Xi , Li Su
Published: June 2012

Effects of different components, autoclaving temperature and autoclaving time on the microstructure features and mechanisms of hydrothermal reactions of activated saline soil were investigated by using XRD, DAT and other microstructural analytical methods. Collected from Tianjin Binhai New District, the mainly raw materials used in this study are the saline soil ( 65%) supplemented with calcareous materials. The results demonstrate that with an increasing calcium to silicon ratio, the diffraction peaks of C2SH(A) and tobermorite fluctuate; the peaks increase initially, then dip down slightly before rising up again. With increasing autoclaving time, the order of generated hydration products is as following: C2SH(A) tobermorite gyrolite. Specifically, once autoclaving time reaches 3h, the changing trend of C2SH(A) to tobermorite becomes obvious, and the conversion from tobermorite to gyrolite can also be observed easily. The hydration products of autoclaved saline soil include mainly C2SH(A) and tobermorite, along with a small amount of CSH(B). Microscopic analysis observed by us reveals that a number of scattered, small and white tobermorite crystals are closely attached to quartz surface, which might play a key role in increasing the strength of the system.
3D Nonlinear Contact FEM Analysis of U-Ring Seal Structure
Authors: Chen Guo Qiang , Tan Jian Ping , Wang Xian , Chen Hui
Published: June 2012

The U-ring reciprocating seal structure with high pressure was taken as research object; the nonlinear contact characteristics and failure mechanism of U-ring seal were analyzed. Finite element model was build through segmentation and sweep methods, Mooney-Rivlin model was selected to characterize the rubber material, the Generalized Lagrange Multiplier Method were designed as contact algorithm. Based on LS-DYNA software, the 3D nonlinear dynamic simulations of U-ring seal structure were realized under different conditions. The results shows that the maximum contact stress steady increased with the growth of medium pressure, relative velocity, and friction coefficient, the top of inner lip and the circle of bottom hole were the main sites of contact stress concentrated on, the reverse velocity of valve stem is the main factor impact too large contact stress and seal damage. The simulation conclusions were verified by comparing the characteristics of actual seal failure.
Experimental Researches on the Preparation of High-Efficient Active Floridin by Mixed Acids
Authors: Shu Ming Yong , Yin Hai Ying , Liu Guang Hui
Published: June 2012

Taking ca-bentonite as the raw material, the activation effect of active floridin prepared by mixed acids of H2SO4, HCl and C2H2O4 is studied. The research results indicate that the main factors influencing the activity and decolorization ratio of floridin include volume ratio of mixed acids, liquid-to-solid ratio, reaction temperature and reaction time. When the volume ratio of mixed acids H2SO4: HCl: C2H2O4=5:5:1, liquid-to-solid ratio =4:1, reaction temperature 80 and reaction time 4h, it is possible to prepare high-efficient active floridin.
Improvement on the Anti-Cracking Properties of Al2O3-SiC-C Based Castables for Trough
Authors: Wei Jun Cong , Huang Jian Kun , Tu Jun Bo , Cao Chun Hui
Published: June 2012

The anti-cracking performance of A12O3-SiC-C based castables for trough was improved by the addition of foaming AC, using silica ash or silica sol as binder. The differential thermal analysis and thermogravimetric investigations were carried out on different matrix slip to investigate cracking performance. The results revealed that the three ways were all effective in improving the anti-cracking performance of the A12O3-SiC-C based castables. Nevertheless, they differed in mechanisms: foaming AC could form a gas passage; silica ash or silica sol could avoid the reaction of silica with cement to generate a calcium aluminum silicate hydrate similar to zeolitic compounds. This will prohibit the release of a large amount of water vapor in a short time. Therefore, the anti-cracking performance was improved.
Microstructure and Hardness of TiC/Ni-Based Coating by Plasma Cladding
Authors: Sun Bin , Zhang Wen Yong , Lu Jin Bin , Wang Zhi Xin
Published: June 2012

TiC reinforced Ni-based composite coating added with 10% TiC particles was prepared on the surface of Q235 steel by plasma cladding. SEM as well as EDS and XRD were used to investigate the microstructure and formation mechanism of composite coating. The results show that between composite coating and substrate is metallurgical combination, and the microstructure of composite coating is composed of basic microstructure dendrite γ-Ni, interdendritic eutectic structure (α-Fe+Cr7C3+Fe3C) and dispersed TiC particle. The maximum value of micro-hardness of composite coating added with 10% TiC particle is 440 HV0.2.
Heave Compensation System for Base Plate Used in Deep-Water Exploration Ship
Authors: Yang Yan Gui , Lu Min Xun , Chen Zhi Xin , Xu Bao Fu , Wang Yun Jie
Published: June 2012

This paper presents a heave compensation system for base plate used in 3000m deep-water exploration ship according to the sea conditions and the compensation requirements. The heave compensation system consists of a passive heave compensation system and an active heave compensation system. The passive heave compensation system with two hydraulic circuits and two air circuits is described, and the working principle is analyzed. The active heave compensation system, which consists of the hydraulic compensation cylinder, the hydraulic system using the closed-circuit and the electrical control system, is also established, and the working principle is investigated. The heave compensation system can keep compensation tension in the wire rope within certain range and make the rod run at design range (±500mm), which can avoid the serious equipment damage and a safety hazard to operators.
Research on Key Technology of Normal Grain Growth for Second Phase Particle Materials by Cellular Automata Simulation
Authors: Gu Zong Lei , Yin Yu Liang
Published: June 2012

Based on cellular automata, a model of simulating grain growth was established and the key technologies of simulation was studied which including second phase particle of single size, multi-size distribution and different shapes generation technologies. The simulation result can accurately reflect the influence law of the second phase particle grain growth and its pinning mechanism. Grain boundaries can therefore more easily break free from the particles than in purely two-dimensional systems, resulting in fewer grain boundaryparticle intersections and a larger final grain size. For a given volume fraction f and size of the particles r, the final grain size increases with film thickness. Moreover, it was found that particles located in the middle of the film are most efficient in pinning grain boundaries. The simulation results are compared with Zener type relations and previous simulation results.
Dynamics Simulation Analysis with Crankshaft Filled Rolling Based on ANSYS
Authors: Shi Xiao Ying
Published: June 2012

With the platform of ANSYS finite element software, on the base of optimal residual stress theory established a crankshaft fillet rolling model under conditions of kinetic analysis and conducted a simulation test. The dynamic changes of residual stress and effective stress are given by different amounts of feed rate and the rolling pass,and comes to the conclusion that 480Q crankshaft when rolling at the depth of 0.66mm the effective rolling stress is the largest, residual stress will increase in the plastic deformation process,for the enhanced production of the actual crankshaft rolling provides quantitative guidance.
Current State of Developing Creep Damage Constitutive Equation for 0.5Cr0.5Mo0.25V Ferritic Steel
Authors: Xu Qi Hua , Xu Qiang , Pan Yong Xin , Short Michael
Published: June 2012

This paper reports a critical summary of literature review of creep damage constitutive equations. Firstly, it introduces the general background on the creep damage in low alloy stainless steel and weldment. Then, it summarizes the typical creep damage constitutive equations for this material available from public literature and discusses the deficiencies existed in the popular creep damage constitutive equations. Finally it outlines the approach to be used in the developing a new set of creep damage constitutive equation and the directions of future work.
The Intelligent Vehicle Navigation System Based on Photoelectric Sensor
Authors: Sun Dong Xu , Zhang Wen Bin , Liu Xue Yang
Published: June 2012

This paper describes the intelligent vehicle navigation system based on 16 bits MCU MC9S12XS128. The system uses MC9S12XS128 as control core, realizing path recognition through the laser sensor, using PWM signals to control the actuator steering and motor speed, making the intelligent vehicle tracing along the black line of 25mm wide placidly. This technology can be widely used in automatic warehouse, robot vehicle and unmanned factory, etc. In this case, we designed and developed this intelligent vehicle navigation system, among it the PID algorithm is applied to the control structure. And the photoelectric sensing technology is also applied into the system. This system is of important reference significance for the research on unpiloted system.
Creative Combination Simulation System Design of Mechanical Transmission Based on Image
Authors: Zhang Xiao Gui , Chu Yi , Gao Bo
Published: June 2012

The assembly of a creative combination of mechanical transmission necessitates a certain level of theoretical knowledge and practical skills. College students often lack the capability to effectively apply such theories and skills together. Such a lack results in the low efficiency and poor results in corresponding experiments. In order to solve the problem, an images show is used to simulate the assembly process of a creative combination experiment of mechanical transmission. The assembly path is described through a binary tree. The corresponding relationship between the binary tree and assembly related information is established. Interactive operation of the assembly process is achieved. The system is simple, fast and with no need of large professional software. Typical microcomputers will meet the experiments requirements and purpose.
Numerical Simulation of Splitting Tensile Strength for Concrete
Authors: Sun Hong , Zhang Jing , Yang Qian
Published: June 2012

The random aggregate model was used to simulate the structure of concrete, and microscopic damage and crack of concrete in splitting tensile tests were simulated by Finite Element Method. The process of splitting tensile damage for concrete was studied. The result shows that the method of numerical simulation based on random aggregate model is mainly feasible, and the surface between concrete aggregate and mortar is the weak part
Numerical Analysis of the Stress in Joggle Double Lap Joint
Authors: Zheng Xiao Ling , Wu Ling , You Min , Liu Kai , Chen Cun Jun
Published: June 2012

Both normal and joggle double lap joints were numerical analyzed to get the stress distribution in mid-bondline and in adherends near the interface using the finite element method (FEM). The results from the numerical simulation show that nearly all the peak values of the stress components as well as the von Mises equivalent stress distributed in both mid-bondline and adherend near the interface of the adhesively bonded joggle double lap joint are significantly decreased to the normal one. It was pointed out that the load bearing capacity of the joggle double lap joint may be higher than that of the double lap joint for its decrease of peak stress, much evenly stress distribution in the middle part of the overlap zone so that more load can be subjected by the joggle double lap joint.
Surface Functionalization of Carbon Nanotubes and Compressive Strength of MWCNTs-OPC
Authors: Wang Fu Xia , Wang Yu Ying
Published: June 2012

Due to their remarkable mechanical properties, carbon nanotubes (CNTs) are considered to be one of the most promising reinforcing materials for the next generation of high-performance cementitious composites. However, the major problem is the highly attractive van der Waals forces between CNTs, which create coherent agglomerates that prove difficult to disperse in cement based materials and reduce the fluidity of the fresh mixture. In this study, the reinforcing effect of highly dispersed multiwall carbon nanotubes (MWCNTs) at ratios of 0.05, 0.1, 0.15， 0.2 and 0.25wt.% of cement has been investigated. The results show that small amount of effectively dispersed MWCNTs can significantly increase the strength of the cementitious
Study of Effective Stress and Surface Subsidence in Pit Precipitation
Authors: Tong Huai Feng
Published: June 2012

Pit excavation and precipitation are bound to cause the changes of groundwater level and stress field in the soil body around the pit, which lead to the deformation of soil body and building around pit and produce varying degrees of influence on the surrounding environment. Based on variable and invariant total stress, this paper calculates the increment of effective stress in the influence range of precipitation, drawing a conclusion that decrement of pore-water stress and increment of effective stress are not simply equal. The methods of calculating surface subsidence caused by the foundation precipitation are summarized in this paper.
The Preparation and Properties of Natural Bamboo Fiber/Polypropylene Fiber Non-Woven Materials
Authors: Ma Wei , Yao Wen Bin
Published: June 2012

Through orthogonal analysis test analyzed three main process parameters(Acupuncture frequency, acupuncture number and acupuncture depth) on the influence of the preparation of Natural Bamboo Fiber/ Polypropylene fiber non-woven materials. The results show that when Acupuncture frequency, acupuncture number and acupuncture depth are 7.8mm\550/min\6 Composite material performance is the best; Acupuncture depth for material mechanics performance influence is the largest
A Beneficial Attempt - An Engineering Practice of Reusing Old Building Materials
Authors: Li Yan , Li Zhe , Song Ying
Published: June 2012

The general practice of town renovation is to pull down old houses and build new ones. However, demolition wastes can be used again. With the support of party A, the Mou Estate designed by the author serves as a good example of old village transformed by utilizing old materials. With old materials particularly preferred, mass demolition and total reconstruction can be avoided, and heritage protection and cultural tourism can be achieved at the same time.
Effect of Thermal Conductivity on Temperature Fluctuations in the Mixing T-Junctions Filled with Porous Metal Materials
Authors: Wang Yong Wei , Lu Tao , Wang Kui Sheng
Published: June 2012

Turbulence mixing in T-junctions filled with porous metal materials is numerical investigated using Large-eddy simulation turbulence model. Three cases of porous metal materials, made of three sintered metal spheres with different thermal conductivities (387.6 W/m۟۬•K for copper, 202.4 W/m۟۬•K for aluminum and 16.3 W/m۟۬•K for steel), are predicted. Compared the results of three cases, a higher thermal conductivity can also contribute more greatly to heat transfer enhancement. In T-junctions filled with porous metal materials, thermal conductivity is weakened considerably by the turbulence mixing of hot and cold fluid. The temperature fluctuation are no obvious different.
Synthesis of Mg0.5Ti0.5PO4 and Its Selectivity to Li+ Exchange
Authors: Jiang Jin He
Published: June 2012

The ion-exchanger Mg0.5Ti0.5PO4 of spinel type was prepared by means of the solid state reaction crystallization method, and was acid-modified. This inorganic ion-exchanger(Mg0.5Ti0.5PO4) has the saturation capacity of exchange for Li+ higher than those for other alkali ions, the saturation capacity of exchange for Li+ reaches to 5.4mmol/g, MgTi-750(H) has a higher selectivity of ion exchange for Li+ than for other alkali ions.
Modeling and Thermal Performance Analysis of Parabolic trough Solar Field with Single-Axis Tracked
Authors: Mao Jian , Hou Hong Juan , Song Ji Feng , Gao Song
Published: June 2012

In this paper, a model of parabolic trough solar field with single-axis tracked was developed based on detailed mathematical derivation. A software tool is also developed for its performance calculation. By the model and software, the direct solar irradiation (DNI) intercepted by the collectors and the thermal output can be obtained for a given solar field under different tracking mode. To obtain the characters of the solar field performance with different tracking modes and regions, the annual performance of the solar field is evaluated for different sites in China such as Beijing, Lhasa. Besides that, the effect of the space between collector rows on thermal output of a solar field is also discussed.
The Synthesis and Ion-Exchange Property of Li+ Memorized Inverse Spinel Mg2Ti0.5(PO4)2
Authors: Jiang Jin He
Published: June 2012

A inverse spinel-type metal compound [Mg2Ti0.5(PO4)2], was prepared by a solid state reaction crystallization method. The Li+ extraction/insertion with this material were investigated by X-ray, FT-IR spectroscopy, and Kd measurement, The acid treated samples had an ion exchange capacity of 8.7mmol/g for Li+. It had a memorial ion-sieve property for Li+.
Battery Capacity Evaluation Research on Wind\Battery Hybrid Generation System
Authors: Liu Zhi Huang , Han Jie Qiong , Gao Xue Jun
Published: June 2012

Battery capacity evaluation is a key work in wind\battery hybrid generation system optimization. Here a research about battery capacity evaluation of wind\battery hybrid generation system is made and a new way to evaluate the capacity is given. First, common evaluation methods such as integration peak value method are introduced. Then energy conversion constraints analysis in wind\battery hybrid generation process is given. Fake charge problem existed in integration peak value method is described comprehensively. At last, a new method to evaluate the battery capacity is put out.
Study on Partial Degradation Operation Modes of VRB-ESS
Authors: Li Bei , Xie Zhi Jia , Jin Wen Tao , Ma Hui Meng
Published: June 2012

Vanadium Redox Flow Battery (VRB) holds unique characteristic as the power and capacity of the physical structure of independent design, which determines VRB different from other battery types in operating characteristics by taking unique operation modes under the circumstance of module degradation or failure in some cases. Paper focuses on how to ride through the case of VRB system with partial degradation or failure during the normal operational conditions, launched a comprehensive experimental study and theoretical analysis. The paper analyzes several situations from the point of view of the battery physical components which should lead VRB system partial failed, and simulated the battery partial degradation or failure by experimental means, and carried out two operation modes to respond to different partial failure situations, which including the use of lower rated power and the use of times rated power. Study proved that those two modes operated in the case of VRB partial failure conditions, has no significant effect to VRB Energy Storage System (ESS) efficiency, as well as be helpful to improve a higher reliability of VRB energy storage system. This paper takes the lead in studying the operational characteristics of VRB- ESS from the angle of partial degradation or failure conditions, which has practical engineering significance for developing VRB -ESS demonstration.
Cascaded Hydro-Thermal Scheduling for Energy-Saving and Emission Reduction
Authors: Zhang Xiao Hua , Zhu Chang Ping , Ma Zheng Hua , Wang Bin , Zheng Jian Feng
Published: June 2012

Cascaded hydro-thermal scheduling has many constraints increasing the difficulty of the scheduling. Furthermore, the limited energy storage capability of water reservoirs, along with the stochastic nature of their availability, make its solution a more difficult job. A multi-objective cascaded hydro-thermal scheduling model considering energy saving, emission reduction and cascade energy storage is presented. Every objective function is converted to fuzzy numbers, then it is reformulated into a single objective. Genetic algorithm is used to solve it. The simulation results show that this model increases generation benefits of hydroelectric power plants, reduces operation costs of thermal power plants, advances comprehensive benefits of power systems
Differences of SF6 Byproducts in Simulated Electric Equipment of Overheating Faults in Different Condition
Authors: Wang Yu
Published: June 2012

The decomposition of sulfur hexafluoride (SF6) in overheated electric equipment at different temperature and humidity was simulated in the study. SF6 is significantly decomposed at 350°C. SF6 is more easily decomposed in high humidity than in low humidity. The concentrations of SF6 byproducts, such as sulfur dioxide (SO2), sulfureted hydrogen (H2S) and hydrofluoric acid (HF), in high humidity are much higher than those in low humidity. Moisture in electric equipment accelerates the decomposition of SF6. In order to insure the safety operation of electric equipment, moisture in the equipment should be strictly controlled. SF6 will be decomposed to format HF. The concentration of HF will decrease when its concentration increases up to a certain concentration. It may be because that HF was strongly corrosive and its corrosion to inner equipment made the concentration of HF decreasing.