bluuebunny/crossref_metadata_2025 huggingface dataset:
Performance Analysis of Automobile Friction Clutch Based on Entropy Fuzzy Comprehensive Evaluation
Authors: Yang Yong Qiang , Zhang Man
Published: February 2012

In view of subjectivity of friction clutch fuzzy comprehensive evaluation method, based on entropy technology, combined with fuzzy comprehensive evaluation method, three clutch before and after optimization are analyzed, correctness of optimization design is verified at the same time, which provides a theoretical basis for clutch design.
Design and Analysis of Hydraulic-Driven Bionic Joint for Undulating Thruster
Authors: Xu Hai Jun , Pan Cun Yun , Zhang Dai Bing , Zhang Xiang
Published: February 2012

Undulate fin is the main propelling organ of MPF mode fish, which could produce propelling wave continually and controllabily while swimming, and this propelling mode has characteristics of high efficiency and low disturbance to fluid field. In this paper, biological structure of “Nilotic Ghost” fish’s long flexible fin(Undulate Fin) is studied with physiological anatomizing and X-ray perspectiving means. Then motion characteristics of the undulate fin are revealed with pictures from fish’s swimming video. Under the bionical conclusions, a hydraulic-driven bionic joint for undulating thruster is designed, including a pair of restoration springs. At last some calculating simulation and testing experiments are carried out, so as to analyze and verify this bionic joint’s characteristics. Results show that, bionic joint driven by hydraulic system could immitate the flexible movements of natural rib in undulate fin, which are described as position restoration, changing of swaying range as well as frequency.
Research on the Performance of Space Liquid Lubrication System with Oil-Storage
Authors: Ji Fen Zhu , Guo Yu Chen , Du Fa Rong , Yang Shu Chun , Xu Bin
Published: February 2012

The gravity oil feed method dose not suit for microgravity environment as the same way dose for ground lubrication system. It is the key problem to be solved that how to supply the oil to friction surface in space liquid lubrication system. It analyzed the lubricating manner. A space liquid lubrication system was designed based on a principle of using deformation energy to supply oil. In the analysis of its basic structure and operating principle, the film calculation mode was established based on the elastohydrodynamic lubrication theory. The lubricating performance was simulated by ANSYS finite element analysis software in microgravity. The calculation results show that: in the microgravity, it could achieve elastohydrodynamic lubrication on friction surface in this lubrication system. When the oil supply hole diameter is 2mm, the film-thickness ratio changes between 1.91 and 4.28. It belongs to elastohydrodynamic lubrication. The hole diameter decreases, the film thickness reduces. The minimum film-thickness ratio is 0.93 when the temperature changes widely from -50°C~+80°C. It belongs to boundary lubrication state.
Performance Calculation of Mill Hydraulic Loading System
Authors: Ji Xiao Bin , Qi Xue Yi , Feng Yong He , Zhang Yang
Published: February 2012

The paper research the mathematical model and the stability of the mill hydraulic loading system by analyzing the principle of mill hydraulic loading system, and find that the main reason for unstability is the low initial pressure of the accumulator, and solved basically the unstability problems of the system and improved the safety and the economical efficiency of anlage fahren through the analysis and the adjustment on initial pressure of the accumulator.
Large-Scale Board Host Rolls over the Production Line Main Electrical Machinery's Electric Control
Authors: Chen Da Li , Hua Xue Hui
Published: February 2012

Elaborated the large-scale board rolling mill main electrical machinery electric control system, in view of main rolling mill request low speed, reliable, precise characteristic, has used Siemens Corporation's S7-300PLC, the 6RA70 installment and the corresponding intelligent module, causes the main rolling mill movement to be reliable, the precision is high, the intelligence is good, moreover might satisfy the different technological requirement. After the test, the use indicated that this system has achieved the design requirements.
3D Cavitations Turbulent Transient Calculation in the Francis Turbine Model
Authors: Zhang Dun , Zheng Yuan
Published: February 2012

Analysis had been carried out, based on the three-dimensional transient viscous turbulent calculation of a Francis turbine full flow field, the complete cavitations model and the two-phase mixture flow model were combined during the calculation, more accurate numerical solution had been obtained. According to the simulation results, the site and extent of cavitations in the turbine flow were reflected within the specific conditions, and were more consistent with the cavitations phenomenon observed in the model experiment, also provided a reference for the more in-depth research.
Thermal Characteristic Analyses of NC Machine Spindle System
Authors: Sheng Zhong Qi , Shi Xiang Dong , Dai Sheng Li , Jin Yan
Published: February 2012

This paper used finite element method to analyze thermal characteristics of numerical control (NC) machine spindle system, and studied the steady temperature field and the transient temperature field of the machine tool and the thermal deformation of the spindle at 3000 rpm. General finite element analysis software ANSYS is used for analysis. Through the analysis of the temperature field and thermal deformation of the spindle system, this paper finally obtained the deformation situation of the spindle system in thermal load. By changing the boundary conditions of the spindle system to analyze the heat distortion of the spindle system and the results showed that assembling a cooling jacket in front of the spindle box can signally reduce the thermal error of the spindle system.
Simulation of Compliant Bump Foil Journal Bearing Using Coupled Reynolds Equation and Finite Element Model Method
Authors: Liu Jiang , Du Fa Rong
Published: February 2012

Based on a “1st generation” compliant foil journal bearing, the performance of foil bearing was simulated according to the model base on Reynolds equation coupled the finite element method. Model considers the bending of top foil, elastic deformation of bump foil, the friction between top foil and bump foil and the interaction between bumps. After compared analysis results to test data, the result of simulation was more accurate than other models, thus this model establish a basis for further study of the compliant foil bearing.
Coating Iron Oxides on Kaolinite for the Adsorption of Fluoride
Authors: Xiang Wen Jun
Published: February 2012

Iron oxides-coated kaolinite (Fe-Kaolinite) was prepared by co-precipitation and indentified using X-ray diffraction (XRD). Moreover, the surface properties and fluoride adsorption characteristics of Fe-Kaolinite were investigated and compared with those of kaolinite. Compared to kaolinite, the BET surface area and surface fractal dimension of Fe-Kaolinite increased significantly. The pH at zero point of charge (pHZPC) of kaolinite and Fe-Kaolinite was 3.16 and 6.24, respectively. In the suspensions of pH 6.0, the fitted maximum adsorption capacity (qmax) for fluoride of kaolinite and Fe-Kaolinite was 1.32 and 5.86 mg/g, respectively. The adsorption data for fluoride by Fe-Kaolinite could be fitted using Freundlich isotherm (R2 =0.987), and Langmuir isotherm was very suitable for describing the fluoride adsorption of kaolinite (R2 =0.991).
Gear Stress Analysis and Discrete Optimization for Wheel-Legged Rover
Authors: Huang Hong Bing , Wang Yong Ming , Fan Tong Hua
Published: February 2012

The wheel-legged rover with a double-half-revolution mechanism uses two tandem planetary gear trains to drive. Its virtual prototype model was built in COSMOS Motion software, and the mechanical data of each gears of the wheel-legged rover were obtained by dynamic simulation under the typical working conditions. On this basis, the finite element analysis model of the wheel-leg planetary gear was established and its stress analysis was done. The discrete optimization mathematical model was built with the optimization target of minimizing the rover’s wheel-leg planetary gear volume and the constraint condition of keeping the Mises stress applied on the dedendum under the admissible Mises stress. Based on ANSYS Parametric Design Language (APDL), the optimization design was done for the above gear based on discrete optimization method. The result shows that the optimized gear not only meets the strength requirement, but also its weight is 58% lower than the original, which will provide a new effective method for optimizing the wheel-leg structure of the rover.
A High Performance Hardware Architecture of Sub-Pixel Interpolator for H.264/AVC Encoder
Authors: Chen Guang Hua , Su Wen Peng , Wang Feng Jiao , Wang An Qi , Zeng Wei Min , Wang Ren Jie , Dai Sun Fang
Published: February 2012

The design of H.264/AVC interpolation unit is very challenging for the high memory bandwidth and large calculation complexity caused by the new coding features of variable block size (VBS) and 6-tap filter. In this paper, a novel one-step interpolation implementation algorithm is proposed which can effectively reduce processing cycle because of its less memory accessing. Moreover, a data reuse scheme is used to save processing cycle and memory bandwidth. A high performance hardware architecture is implemented according to the methods mentioned above. As a result, 26% memory bandwidth reduction and 45% processing cycle reduction are achieved, which shows that our architecture is an efficient hardware accelerating solution and can be used in real-time encoder.
Effects of Material Properties and Thickness of Die Attach on Package Delamination of IC Packages
Authors: Chang Chia Lung , Chang Cheng Lun , Wang Ying Long
Published: February 2012

Finite element method is carried out to calculate the fracture mechanics parameter of interfacial cracking of TSOP (Thin Small Outline Package). Fracture mechanics approach together with finite element results are used to study the impacts of material properties and thickness of die attach on the energy release rate at crack tip of interfacial delamination between die pad and die attach. The results show that larger Young’s modulus, smaller CTE as well thinner thickness of die attach can reduce ERR at crack tip during reflow.
On In Situ Calibration of SINS and Doppler Dead Reckoning Navigation System
Authors: Yao Kai , Zhu Qi Dan , Zhang Bo
Published: February 2012

This paper addresses a practical problem arising in the calibration of bottom-lock doppler velocity log for the navigation of surface ships. Firstly, a dead reckoning navigation algorithm and briefly error analyze are proposed. Then, employing ship’s true trajectory and calculated trajectory, the rotational alignment offset between a bottom-lock doppler velocity log and a strapdown inertial navigation system as well as the scale factor error of the doppler velocity log can be experimentally determined using sensors commonly deployed with a vehicle in the field. It requires velocity values from the vehicle's doppler log and strapdown inertial navigation system, and absolute vehicle position fixes from a GPS receiver. Lake experiment results show that the calibration algorithm can calibrate the error parameters effectively, thus the position error decreases significantly after compensating the error parameters.
The Remote Intelligent Monitoring and Fault Diagnosis & Processing System
Authors: Wang Chang Yi , Bao Peng , Zhang Zhuo
Published: February 2012

This subject is proposed based on the conflict between the heavy workload for maintenance personnel and few personnel at the geological survey automated master station at present, and the purpose is to solve the problem that the SCADA real-time monitoring system, UPS power supply system, automated support system as well as the automated computer room environment and equipment cannot achieve the real-time monitoring, fault diagnosis and accident processing of the remote unified platform. It proposes the remote online automatic monitoring and intelligent diagnosis and processing system on the basis of the OPEN3000 system platform. It uses the distributed network architecture in the network design to protect the security of database and the video records in the video system; it adopts the modular structure design, and combined with the expert system and the rule database design of database knowledge, thereby solving the technical problem that the real-time monitoring and fault diagnosis of SCADA, UPS, video and many other systems and equipment are being integrated into a unified platform.
Influence of Solution Treatment on Atomic Diffusion and Mechanical Properties of AZ80 Magnesium Alloy
Authors: Zhang Ju Mei , Wang Zhi Hu , Sun Wan Chang , Niu Li Bin
Published: February 2012

The atomic diffusion and mechanical properties of as-cast AZ80 magnesium alloy after solution treatment at different time were studied by OM,SEM,EDS as well as tensile testing. The results show that the coarse β-Mg17Al12 phase distributed along the grain boundaries as net microstructure is almost dissolved after solution treatment, and the content of Al that in the α-Mg matrix is well distributed with the solution time prolonged. Because of the β-Mg17Al12 phase reducing and granulating, the function of precipitates phase strengthening was depressed and the hardness (HB) of alloy dropped obviously. However, the tensile strength(σb ) and elongation(δ) enhanced remarkably and the yield strength (σ0.2) decreased slightly.
Influence of Solidification Process on Calcined Kaolin Geopolymeric Powder
Authors: Yun Ming Liew , Kamarudin Hussen , Al Bakri Abdullah Mohd Mustafa , Binhussain Mohammed , Musa Luqman , Khairul Nizar Ismail , Ghazali Che Mohd Ruzaidi , Heah C.Y.
Published: February 2012

This paper aims at investigating the influence of solidification condition on the processing of calcined kaolin geopolymeric powder. This is a new process developed using the geopolymerization process. Geopolymer slurry was prepared from calcined kaolin and activating solution (mixture of NaOH and Na2SiO3). This slurry was allowed to solidify in oven and then crushed and grounded to fixed particle size. Compressive testing and SEM analysis were performed in this study. The results showed that the solidification condition at 80 °C for 4 hours was the best to synthesize the geopolymeric powder where this solidification condition results in geopolymeric powder which can produce higher strength resulted geopolymer paste. The microstructure showed more intervening gel phase which indicates that the geopolymerization process continued to react after the addition of water to the calcined kaolin geopolymeric powder.
Optimization of Resinification of Liquefied Products from Trash ACQ-Treated Antiseptic Wood
Authors: Ding Fang , Qiu Ying Ying , Liu Zhi Gao , Zhang Qiu Hui
Published: February 2012

In this paper, Anticorrosive fir was liquefied in phenol, and the liquefied wood was used to produce adhesive by resinification. The effect of resinification time, resinification temperature, mrNaOH/P(molar ratio of NaOH/liquefied wood) and mrF/P(molar ratio of formaldehyde/liquefied wood) on resinification was investigated by orthogonal experiments in term of the viscosity, solid content and pH of resinification product. Adhesive produced by resinification was then used for plywood production, and plywood strength was detected to assess adhesive. According to experiment results, the optimal conditions of resimification are as follow: resinification time of 140 min, resinification temperature of 90 °C, mrNaOH/P of 0.5 and mrF/P of 2.2.
Electronic Properties and Magnetic Phase Transition in Half-Heusler Compound Fe1-XCuxMnSb
Authors: Wu Bo , Yang Xiu De , Zhang Song
Published: February 2012

By using the first-principles calculations within the density functional theory (DFT), we investigate the structure, antiferromagnetic-ferromagnetic phase transition and half-metallicity of half-Heusler compound Fe1-XCuxMnSb. For the ferromagnetic state, the calculated lattice constant follows the Vegard law, and total ferromagnetic moment agrees with Slater-Pauling rule as x<0.5 while suffers large deviation as x>0.5. As x=0.75, a novel magnetic phase transition occurs, which mainly derives from the competition between RKKY and superexchange magnetic coupling. Further analyses on density of states (DOS) reveal that the Fermi level can be adjusted by doped Cu concentration in ferromagnetic state, and d partial DOS of Mn atoms with different spin orientation compensate for each other that results in symmetric spin-up and spin-down band in antiferromagnetic state.
Investigation on Physical Properties of Ti-Based Quasicrystalline
Authors: Liu Wan Qiang , Wang Xin Lu , Zhang Shan Shan , Wang Li Min
Published: February 2012

The Ti1.4V0.6Ni ribbon alloy containing icosahedral quasicrystal is prepared by melt-spinning technique, and the Ti40.33Zr40.33Ni18.34 icosahedral quasicrystal powders are prepared by mechanical alloying. Both samples are annealing in a vacuum furnace. DSC trace obtained during continuous heating to 1300°C show a distinctly broad exothermic peak between 100°C and 1000°C for the Ti1.4V0.6Ni alloy, two sharp exothermic peaks between 100°C and 700°C for the Ti40.33Zr40.33Ni18.34, respectively. The magnetic behavior results demonstrated the Ti1.4V0.6Ni ribbon alloy exhibited higher ferromagnetic properties than those of Ti40.33Zr40.33Ni18.34 powders both at 15 K and 300 K. The specific heat capacity of two the sample increase when the temperature increase from 400 to 650°C.
Carbon Fiber Frame for Military Use
Authors: Yang Han , Zhang Xiang Hong , Hu Xin
Published: February 2012

The traditional pot frame for military use is made of the stainless structure. This kind of frame is not only heavy, but also difficult to carry. In order to reduce the soldiers’ burden, this study adapts the Carbon fiber and reinforced nylon to make the frame more comfortable. The total weight has reduced 70% compared with the original frame, which greatly increases the protect function for military.
Research and Simulation on Metal Cutting Process
Authors: Nie Xue Jun , Wang Li
Published: February 2012

A method about analysis and simulating metal cutting process on lathe is introduced through establishing the system’s mathematic model by using MATLAB tools. The effects of cutting and machine tool’s structure parameters on the performance of metal cutting process are obtained, which will provide a theoretic basement for optimizing the performance of metal cutting process.
Multi-Depot Vehicle Routing Problem with Hybrid Genetic Algorithm
Authors: Dang Li Wei , Sun Xiao Ming
Published: February 2012

About the multi-depot vehicle routing problem, considering the transport distance and the number of dispatching vehicles together can effectively reduce the total delivery costs. Firstly establish the corresponding mathematical model by taking the two factors into account. Secondly solve the model by using hybrid genetic algorithms. Thirdly demonstrate the effectiveness of the model and algorithm by an example
A Study on the Weatherability of Weathering Steel after Atmospheric Corrosion
Authors: Wang Zhi Fen , Liu Jian Rong , Wu Li Xin , Huang Hai E , Zhou Qian Xue
Published: February 2012

The weatherability of a weathering steel W450QN was compared with a carbon steel Q345 after 5 years atmospheric corrosion. The results indicated that the corrosion resistance was better for W450QN than Q345 based on the corrosion rate. The characteristics of the rust layers indicated the rust layer on W450QN was denser and thicker than that of Q345. The rust layers were mainly composed of goethite (α-FeOOH) with a few of lepidocrocite (γ-FeOOH). W450QN had better weatherability attributed to the alloying elements of copper, chromium and phosphorus enriched in the rust layer.
Enzymatic Extraction of Polysaccharides from Laminaria Japonica and their Free Radical Scavenging Activity and Antimicrobial Activity Evaluation
Authors: Chen Jing , Tian Miao Ping , Deng Shang Gui , Fang Xu Bo
Published: February 2012

Complex enzymes, including cellulase, pectinase and neutral protease were used for extraction of laminaria polysaccharides, which have a broad range of applications in the food, pharmaceutical, agricultural and chemical industries. The enzymatic extraction conditions were optimized and the maximum polysaccharides yield was achieved with the addition of 2.5% of enzymes under a pH value of 5.0 and temperature of 55 °C for 210 min. Polysaccharides prepared under the above conditions were effective against some pathogenic and spoilage microorganisms, including Salmonella sp, Bacillus subtilis, Enterococcus faecalis, Proteus vulgaris, Staphylococcus aureus, Escherichia coli, Pseudomonas fluorescens, with a diameter range of 5.1 ± 0.29-12.5 ± 0.78 mm. In addition, antioxidant activity of laminaria polysaccharides against hydroxyl radicals was also investigated and it was observed that the polysaccharides displayed obvious scavenging activity on hydroxyl radicals in concentration-dependent manner. Overall, polysaccharides from Laminaria Japonica demonstrated potential applications in food safety and control.
Optimum Design of Double-Well Pumping Units Based on Calculation of MATLAB Optimization Toolboxes
Authors: Qu Wen Tao , Liao Dong Sheng , Ren Tao , Sun Wen
Published: February 2012

Beam double-well pump unit as a new generation of pumping unit is currently used in mechanical oil production. However, due to a number of pumping system parameters, the conventional design can not achieve the optimal pumping system parameters Using MATLAB simulation optimization algorithms, simulates the structural parameters, rod speed, rod acceleration, rod load, crank torque factors and gear’s crank shaft net torque of the double horse head double-well pumping unit, achieving optimal design of double horse head double-well pumping system, with the existing conventional design of double horse head double-well pumping unit, double horse head double-well pumping unit has a great improving than conventional pumping unit in motion and power dynamic characteristics.
With the Backlash Dynamics Simulation of a Crank-Slider Mechanism
Authors: Bo Shao Jun , Ji Kui
Published: February 2012

On the basis of flexible multi-body system dynamics theory, we built flexible multi-body system dynamics models which include a backlash, and to a slider-crank mechanism as the research object, we made a preliminary study on the effect on the flexible components and the backlash of the kinematic pair on mechanical system dynamics characteristics. To consider the backlash of the kinematic pair and component of flexible space can show a preliminary research on the dynamic simulation, and focus on the backlash, friction and gravity field to influence in the dynamic characteristics of the system. The simulation results show that, due to the existence of backlash made the two components frequent collision in the process of the stretching, clearance, flexible and friction are closed, make the system nonlinear characteristics increased.
Prestress Force Identification Based on Forced Vibration Tests of Eccentrically Prestressed Concrete Beam
Authors: Xu Jiang Lin , Sun Zhi
Published: February 2012

The measurement of residue prestress force is one main issue for condition and performance assessment of prestressed concrete beam bridge. This paper proposes a vibration based parameter estimation technique for this purpose. Under given form external excitation, beam velocity responses at multiple points are collected firstly. The prestress force of the beam is then identified based on the minimization of the least square difference between the measured response and the baseline response. A numerical study on a beam of variant length, subjected to a constant prestress force with variant eccentricity, is conducted to show the effect of prestress force and the effect of bending moment due to eccentricity on fundamental frequency of the beam. The results show that this vibration based method for prestress force identification is both theoretically feasible and practically workable.
Research on Nonlocal Elastic Kernel Function under Ultrasonic Excitation of Ceramics Materials
Authors: Bian Ping Yan , Zhao Bo , Li Yu
Published: February 2012

Through considering the influence factors of ultrasonic excitation parameters, the nonlocal kernel parameter formula under ultrasonic excitation is established and the nonlocal elastic kernel function is also deduced. The attenuation characteristics and effects of the elastic kernel function are also studied in this paper. The nonlocal stress under ultrasonic vibration is calculated based on the nonlocal elastic kernel formula. It is concluded that stress decay phenomenon can explain through nonlocal kernel function attenuation in frequencies.
Dynamic Analysis of Space Structure Deployment with Transient Thermal Load
Authors: Wu Jiang , Zhao Zhi Hua , Ren Ge Xue
Published: February 2012

Thermal load is non-ignorable in the design and analysis of high precision and reliable space deployable structures. A new approach based on flexible multibody system is presented in order to investigate the thermoelastic effect on the deployment of space structure. Dynamic equations of an Euler Bernoulli beam element with transient thermal load are derived in Absolute Nodal Coordinate Formulation. The temperature distribution in the beam section is assumed as linear, which is reasonable for slender beams. The resulting generalized thermoelastic forces can be decomposed into thermal axial force and thermal bending moments, which can cause tension/compression and bending of the beam respectively. The dynamic equations of the beam element are then assembled into a flexible multibody system. Deployment analysis of a space mechanism with transient thermal load is studied with the new approach. Simulation result shows that thermoelasticity could cause static deformation of the final configuration as well as affect the external driving forces.
Application of Symmetrical Equations in Parametric Design of Involute Gear
Authors: Zhuang Su Tao , Ge Yuan Yuan , Yang Qian Ming
Published: February 2012

Parametric design based on feature is the main method in parametric modeling of involute gear. In this paper, symmetric equations of the involute and the fillet curve are established according to the coordinates of points symmetrical about a straight line. And the tooth profile or alveolar profile of involute gear is generated accurately through controlling parameter of equations quantitatively. The problem of generating tooth profile accurately can be solved. Then the correctness of gear’s parametric design is ensured. The accuracy and efficiency of the gear’s engineering design are all improved.
Mechanical Properties of Flexible Structures with Helical Reinforcements under Axial Load
Authors: Huang Wei , Shan Jian , Weng Zhen Jiang
Published: February 2012

Flexible structures with helical reinforcements are widely used in engineering because of their low bending stiffness and high strength. To strengthen the core, we focus on those structures which the helixes will contact the inner core loaded axial tension. The contact pressure between layers is taken into consideration and eliminated by using deformation compatibility equation. The pitch angle changes under axial tension which induces the geometric nonlinearity. The results were systematically compared with other researchers’ theory, which adopted more assumptions. Suggestions about the appropriate range of parameters are given, when assumptions can be used. The solution is validated with that obtained by both the finite element method and the classical solutions of two extreme cases.
Research on TPL Cloud Service Platform Architecture
Authors: Pang Jin Rong , Yuan Chun Hui
Published: February 2012

This paper proposes the method of constructing the TPL (Third-party Logistics) cloud service platform for the problem of synergistic interaction between logistics and manufacturers. This paper analyzes the key technologies and the demand of TPL service platform from the perspective both of the logistics providers and of the users. This paper constructs the architecture of TPL cloud service platform based on intellisense and cloud, which consists of Iaas cloud platform, PaaS cloud platform, SaaS cloud platform and application terminals. We can achieve services convergence for the demand of logistics through the TPL cloud service platform.
TiN Protective Coating on NdFeB by DC Magnetron Sputtering
Authors: Li Jin Long , Mao Shou Dong , Song Zhen Lun , Xue Qun Ji
Published: February 2012

TiN protective coating was prepared on NdFeB by DC magnetron sputtering to improve the corrosion resistance and scratch resistance of the magnetic. During deposition, the nitrogen/argon mixture gas was introduced into the chamber with the nitrogen partial pressure at 20 % and 10 % and the bias of 200 V was applied to subtract, respectively. At a lower nitrogen partial pressure of 10%, TiN coating was composed of many particles with an irregular shape. With increasing the nitrogen pressure to 20%, composing particles become small and show as the regular trihedron shape. All TiN coatings have a cubic structure. The bias makes the depositing TiN coating denser and preferential growth become no obvious. By the nitrogen partial pressure of 20 % and bias of 200 V, the dense TiN coating has best corrosion resistance and excellent wear resistance.
Analysis of Buffering Properties of Honeycomb Material
Authors: Yang Ming Bo , Chen Jin Bao , Deng Fei , Chen Meng
Published: February 2012

The buffering properties of honeycomb material are analyzed in the presented work. Theoretical analysis based on energy method is first presented, the buffering process of honeycomb material can be divided into three phases, honeycomb material can be equivalent to orthotropic material and the equivalent material properties are given. Being good at soil mechanics, Abaqus can simulate lunar soil very well. Using a constitutive model for honeycomb material, which is a built-in user material model, the presented work developed a honeycomb material simulation model and verified with a practical example. Now we can analysis the entire landing buffer process in Abaqus, which is a complement to existing analysis processes.
A New Design Method for the Rotor Profile Curve of the Cam Pump
Authors: Liu Guanyi , Liu Ping Yi , Wei Wen Jun , Zhang Shao Ying , Li Hai Tao
Published: February 2012

The cam pumps are especially suitable for the transmission of the liquids with different impurities or pure solid materials. A new design method for the rotor profile curve of the cam pump was put forward to improve the wear-proof of the addendum of the rotors. A rotor with a simple profile curve was designed and then the profile curve of another rotor would be generated by a tool whose cutting profile curve was the same as the designed rotor profile curve. This method was stated and a mathematic model was built based on gear meshing theory by choosing an ellipse as the designed rotor profile curve. The influence of the design parameters on the generated rotor profile curve, the area utilization coefficient of the pump and the relative normal curvature of the two profile curves at the contact points were analyzed. The results demonstrated as: the designed profile curve can be some kind of simple continuous curve and the generated profile curve is continuous curve as well; the area utilization coefficient, C, increases by increasing the major semi-axis of the ellipse, a, or decreasing the minor semi-axis, b, if the designed profile surface is an elliptic one; the maximum of the area utilization coefficient, Cmax, will decrease when the blade number of the rotor 2, z2, increases because of the undercutting; the maximum of the area utilization coefficient is 0.48 when z2 is 2; the blade number of the rotor 2 is no more than 4.
Application of Pulsed Blowing Technique in High-Lift Control Surface Design
Authors: Wu Peng , Deng Xue Ying , Wang Yan Kui
Published: February 2012

Because the flight performance of aircraft is so dependent on aerodynamic efficiency of control surfaces, it is very important to eliminate the flow separation over the control surfaces at high deflection angle in order to keep the aircraft having good flight capability, especially for the modern aircraft with tailless aerodynamic configuration. A novel flow control technique to eliminate flow separation of control surface at high deflection angle and creat high lift increment by pulsed blowing at leading edge of control surface is discussed in this paper. The performance of lift enhancment of control surface which used this technique is investigated, and based on the zonal analysis of pulsed frequency, the control characteristic of this technique is also discussed.
Calibration of a Density-Dependent Modified Drucker-Prager Cap Model for AZO Powder
Authors: Kim Yong Bae , Lee Jong Sup , Lee Sang Mok , Park Hoon Jae , Lee Geun An
Published: February 2012

AZO (Aluminum doped Zinc Oxide) is widely used to produce transparent conductive coatings for liquid crystal displays, flat panel displays, plasma displays, touch panels, and electronic ink applications. The densification behavior of AZO powder is a critical factor related to the design of the compaction process. In this study, the densification behavior of AZO powder during cold compaction has been investigated in order to calibrate the modified Drucker-Prager Cap (DPC) model for FE simulations. A compaction test with a cylindrical die was carried out, and two failure tests were performed: the diameteral compression test and the uniaxial compression test. AZO compacts with various densities from the compact tests were used as specimens for the failure tests. Based on the experimental results, the parameters of the modified DPC model were determined through simple manipulations.
Study on Interface Pattern of Zn-5wt%Al Alloy during Unidirectionally Solidification
Authors: Yang Fu Shuang
Published: February 2012

The interface pattern of Zn-5wt%Al alloy was investigated during unidirectionally solidification with different withdrawal rate and superheat degree. It was showed that the pattern of liquid/solid interface varied with withdrawal rate and superheat degree. While the superheat degree of alloy melt was low and the withdrawal rate was increased, the change of interface pattern was the same as the normal change of interface pattern. While the superheat degree of alloy melt was high and the withdrawal rate was increased too, the change of interface pattern was different. As a result, the pattern and stability of liquid/solid interface was chosen by withdrawal rate and superheat degree mainly.
Analysis of Distillation Plant Stainless Steel Corrosion Behavior
Authors: Wang Xiao Jing , Gao Wei Dong
Published: February 2012

In tar distillation plant of the stainless steel plate tower wall's corrosion and heat exchanger tubes' cracking fracture were analyzed, including the microstructure, fracture morphology and the macro-theoretical analysis.
Preparation and Swelling Inhibition of Polyammonium
Authors: Deng Qiang , Wei Deng Feng , Ye Zheng Qin , Xu Jin Fang
Published: February 2012

A new anti-swelling agent was synthesized by polymerizing epichlorohydrin and dimethyl amine polymer. The swelling inhibition properties were investigated over clay and shale. It was found that the clay inhibition of swelling properties was greatly enhanced compared with common inorganic salts. However, to shale, the swelling properties did not inhibited efficiently by using prepared polymers. Furthermore, the influence of cross linking of polyammonium to the swelling ability of prepared polymer has been also carried out by using triethylenetetramine cross linking agent. In the case of shale, the swelling inhibit properties was improved after cross link, while opposite swelling effect was observed over clay.
Stress Strain Analysis of High Porous Ceramics
Authors: Marcián Petr , Majer Zdeněk , Florian Zdeněk , Dlouhy Ivo
Published: February 2012

The presented paper describes the creation of a computational model of highly porous materials, and a stress-strain analysis is performed. The computational model is created using micro-CT by the finite element method in the ANSYS 12.0 software. The micro-CT slices are converted into a 3D model using image processing. The local equivalent stress (HMH criterion) and struts deformation are analyzed. Commercially available ceramic foam, 85%Al2O3-14%SiO2- 1%MgO, was used in the experiment part of the paper.
Study on Basic Properties of Akund Fibers and Pretreatment Process
Authors: Wang Qin , Cheng Long Di , Jiang Xiao , Stojanovska Elena , Fan Wen Hong
Published: February 2012

The need for fiber modification was described, and the principles about how the reagents act on the fibers was also shown, then a series of orthogonal experiments was designed, at last a comprehensive analysis and pictures about the surface of the fibers before treatment and after treatment from the microscope was finished, at last get the conclusion 50g/L friction-up reagent and 3% weight gain reagent is the best solution.
Noise Radiation Characteristics of the Washing Machine Based on Sound Intensity Measurement
Authors: Liu Bin , Feng Tao , Wu Xue , Li Nan
Published: February 2012

Based on the sound intensity measurement and analyzing, the noise radiated from the washing machine with horizontal axis was discussed to identify the noise source and find its propagation path. According to the principle of the sound intensity measurement, the measurement grids were arranged at the outside surfaces of the washer, and the distance was set to 20cm. The result showed that the noise source was near the right surface of washer’s motor installing. The maximum sound intensity values are mainly in frequency bands of 2 KHz and 4 KHz. Back surface of washer with sound power level 51 dB radiated the maximum sound intensity value 55.8 dB for 2 KHz and 56.0 dB for 4 KHz. There was also appeared the maximum sound intensity of low frequency 100 Hz in Right surface, which was caused by the vibration of motor transferring to the right surface shell. The results can provide technology support for the noise control of washing machine.
Study of Retained Austenite in Q&P Steel for Automobile
Authors: Zhuang Bao Tong , Jiang Hai Tao , Tang Di , Mi Zhen Li , Kuai Zhen
Published: February 2012

Retained austenite of Q&P (Quenching and Partitioning) processed 0.2C-1.51Si-1.84Mn steel heated in intercritical region and full austenite region are investigated. The results show that the maximum volume fraction of retained austenite heated in intercritical and full austenite region is 13.39% and 5.23% respectively. Carbon partitioning completed within 10 s for both heating modes. The microstructure after full austenitization consisted of martensite laths and thin, inter-lath retained austenite film. Austenite blocks is observed as well after partial austenitization.The distribution of retained austenite is related to the amount of grain boundaries by EBSD techniques.
The Effects of Electromagnetic Stirring on Solidification Structure and Macrosegregation of Pb-Sn Alloy
Authors: Zhao Qian , Zhang Xing Guo , Fang Can Feng , Zhang Nan , Han Yan Bo , Guo Jian She , Hou Xiao Guang
Published: February 2012

The effects of different electromagnetic field and technological parameters on the microstructure and composition segregation of Pb-80%Sn alloy were studied. The results show that, both rotating and spiral magnetic field can improve the composition segregation ,refine grains of alloy. Moreover,the spiral magnetic field is more effective on improving composition homogenization and grain refining. The electromagnetic force distribution of spiral magnetic field is more helpful to form a well stirring in a larger zone and promote the formation of equiaxed grains, and the direction of the grain arrangement is much smaller. The technical parameters of spiral magnetic field have been optimized. It is found that, under the spiral magnetic field condition, when stirring time and exciting current exceeded a critical value, the size of the primary phase became larger. Therefore, there existed an optimum value of magnetic stirring parameters for the homogenization of component and refinement of grains.
Swelling Behaviors and Water States of Fibrous Membranes Electrospun from PHBV-g-PVP
Authors: Wang Wei , Cao Jian Da , Lan Ping
Published: February 2012

Fibrous membranes with a fiber diameter between 320 and 460 nm were electrospun from poly(3-hydroxybutyrate-co-3-hydroxyvalerate)-graft-poly(N-vinylpyrrolidone) (PHBV-g-PVP) and their specific water absorption behaviors were investigated for biomaterial purposes. Water swelling experiments indicate that all samples have a great capacity for water uptake, while a remarkable overshoot occurs for the membranes electrospun from PHBV-g-PVP other than those from PHBV. DSC characterization indicates that only non-freezable bound water and free water can be distinguished in all electrospun membranes.
Research on the Compression Algorithm with Querying without Decompression Based on the Streamline Dynamic Successive Trees
Authors: Huo Lin , Xing Xiao , Zou Xian Ze
Published: February 2012

Index compression is an effective way to solve the problem that the index is too huge when mass information is retrieved. Based on the Streamline Dynamic Successive Trees(SDST) index, a compression method with querying on the index without decompression is proposed in this paper.It also presents the compression algorithm,the algorithm of how to retrieve without decompression.The experiments show that the compression efficiency of SDST is much better than that of the IF index and its querying time is much less.
Rapid Estimation of Xanthan and Biomass Concentration during Xanthan Production under Solid State Fermentation on Polyurethane Foam with Near–Infrared Spectroscopy
Authors: Zhang Zhi Guo , Chen Hong Zhang
Published: February 2012

Recently, some solid state fermentation (SSF) processes of xanthan production were studied. However, quantitative analysis of the concentration of xanthan and biomass is more complicated than that of submerged fermentation. To facilitate the analysis of these components, near–infrared spectroscopy (NIRS) was used. A NIRS calibration models for rapidly estimating xanthan and biomass concentration in xanthan fermentation on inert support of polyurethane foam was established. The wavenumber and spectral pretreatment method were optimized. The data of cross validation and external validation shows that NIRS was suitable for rapid and accurate quantification of the concentration of xanthan and biomass in solid state fermentation on inert support. This method will provide much convenience for the research of solid state fermentation on inert support.
Subsurface Crack Initiation and Propagation Mechanisms in Very High Cycle Regime
Authors: Song Wen Jie , Li Wei
Published: February 2012

Rotary bending fatigue test was adopted to study the subsurface fracture property of a low alloy steel in very high cycle regime. As a result, the subsurface crack initiation and propagation with fine granular area (FGA) induced by subsurface incision is the predominant reason for fatigue facture of this low alloy steel in very high cycle regime of N>106, which can be divided into three stages to discuss: (I) small crack propagation inside of FGA, (II) stable crack propagation in the fish-eye region outside of FGA and (III) final catastrophic fracture outside of fish-eye. The crack growth rate in the first stage is lower than 10-11m/cycle, which means that the progress of FGA formation is extremely slow and consumes the great majority of total fatigue life. The interior stress intensity factor range corresponding to subsurface inclusion and the stress intensity factor ranges of FGA and fish-eye (ΔKint-th, ΔKFGA and ΔKfish-eye) can be regarded as the threshold values of controlling subsurface crack propagation in these three stages, respectively.
The Selection of Military Equipment Supplier Based on Projection Pursuit Method
Authors: Chen Ping , Du Jia Xing , Dong Yu Cai , Xia Jing , Gong Lei
Published: February 2012

The selection of military equipment supplier is a very complex process. In this paper, based on projection pursuit classification method (PPC), we give the best projection direction and weight coefficients of each evaluation index, the sort of evaluation of each supplier, and consequently, we obtain the selection scheme of supplier. The method has strong objectivity, which provides scientific basis for correct decision.
High Strength Offshore Steel with Excellent Weldability
Authors: Chen Yan Tang , Zhang Kai Guang
Published: February 2012

A new high strength low alloy (HSLA) steel in 370MPa yield strength grade with low susceptivity to weld cold cracking has been developed for offshore engineering. The microstructure feature of base steel and weld heat affected zone (HAZ) has been investigated. The systematic studies showed that the developed steel exhibited high strength(yield strength≥370MPa)、high impact toughness and excellent weldability. The complex inclusions containing fine oxides in HAZ promoted the acicular ferrite formation in weld thermal cycle and resulted in desired mechanical properties of HAZ.
Compression Behavior Evaluation of Directly Compressible Excipients
Authors: Du Yan , Zhao Li Jie , Feng Yi , Xu De Sheng
Published: February 2012

This work proposes to study the compression behavior of the directly compressible excipients microcrystalline cellulose (MCC). Many factors play a significant role in the compression behavior, such as the particle size and particle size distribute, flowability, particle density, porosity and so on, thus making it necessary to understand the dominant contribution of each factor. We studied the compression behavior of different types of MCC from three aspects: the physicmechanical properties, compression process and tablet mechanic characteristics of the excipients. As expected from the elastic recovery measurements, the MCC gave coherent tablets that could be handled under the chosen experimental conditions.
Design of Programming Electronic Delay Detonator
Authors: Li Hong Yue , Chen Zhao Quan , Liu Feng , Yan Shi Long
Published: February 2012

A design proposal for a kind of online programming electronic detonator is introduced in this paper. The safety and reliability of the design is analyzed, and then the methods for realizing the design proposal are exploited. The structure of the electronic detonator, the internal control circuit structure diagram, and part of the software flowchart, are presented. The time programmable increment step of 1 millisecond is arrived at, while the programmable delay time of this system ranging from 1 to 12000 milliseconds is obtained. Taking its safety and reliability, its accuracy in delay time, and its easy of use, into account, the online programming electronic delay detonator proposed in this paper will be extensively applicable to complicated blasting engineering in the future.
An Agent and Web Service-Based Surge Protection Devices Automatic Test System
Authors: Tang Shan Cheng
Published: February 2012

The existing old SPD(Surge Protection Device) test systems have following defects: they are isolated computer systems; when enterprise management applications or processes change, they can not respond in time to deal with the diversifications. To solve these problems, firstly, this paper analyzes the agent and web service-based lightning protection testing system architecture; secondly, this paper analyzes the architecture of SPD automatic test system; Finally, we designed and implemented the agent and web service-based SPD test system, the practical application show that the system overcame the shortcomings of old systems, integrated with other systems through the agent and web service architecture, avoided forming information silos, was smart to respond to the diversifications of enterprise management applications or processes.