bluuebunny/crossref_metadata_2025 huggingface dataset:
Band Gaps of 2D Phononic Crystal with Graded Interphase
Authors: Cai Bei , Wei Pei Jun
Published: October 2011

Propagation characteristics of elastic waves in 2D phononic crystal consisting of parallel cylinders embedded periodically in a homogeneous host medium are investigated. The multiple scattering method and the Bloch theorem are used to derive the dispersive equation. The dispersive curves and the band gaps between them are evaluated numerically in the reduced Brillouin zone. The graded interphase between the cylinders and the host are considered. The influences of the graded interphase with different gradient profiles are discussed based on the numerical results.
Coal Mining Workers’ Unsafe Behaviors Consequences Analysis and Occurrence Mechanism Research
Authors: Meng Xiang Bao , Yao Qing Guo
Published: October 2011

This paper according to the cases of HuNan ZiJiang coal mining and JiNing coal mining group to analysis the consequences of coal mining workers’ unsafe behaviors, getting the main characteristics of accident which caused by Coal Mining Workers’ Unsafe Behaviors including: dead and injured is more, the economic loss is huge and the society effects is bad, and more further step to analysis the occurrence mechanism which caused by coal mining workers’ unsafe behaviors, at last we find that we should use intervention technology to intervene the coal mining workers’ unsafe behaviors to prevent from causing of the coal mining accident.
Research on All Fiber-Optical Fluorescence System Measuring Mineral Oil in Water
Authors: Wang Yu Tian , Gao Xue , Wang Hui Xin , Li Xue , Yuan Rui Rong
Published: October 2011

A fluorescent optical fiber measuring system used to measure the concentration of the mineral oil in water is put forward in this paper according to the mechanism that the mineral oil in watercan emit fluorescence when excited by ultraviolet light. The pulse xenon lamp is used as excitation light source, while the linear CCD is adopted as the fluorescent signal of photoelectric detection components instead of the traditional photomultiplier tube in the system, combining with the optical fiber sensor technology and weak signal detection technology. It also equipped with the data acquisition card to realize data receiving and A/D conversion, using micro computer to store and display the data. This in turn realizes the accurate measurement of the concentration of mineral oil in water. The fluorescence optical fiber measuring system that used to measure the concentration of the mineral oil in water has the characteristics of simply structure, high sensitivity, wide linear range, probe passive and so on. The experimental result shows that this method is completely feasible.
Deformation Analysis for Coal and Gas Outburst Cavity
Authors: Hu Qian Ting , Wu Wen Bin , Cheng Guo Qiang
Published: October 2011

Outburst cavity formed during coal and gas outburst can be pear shaped, elliptical, or just like an irregularly elongated ellipsoid, its capacity is always smaller than the volume of ejected coal. And the gas emission quantity is almost 4 to 10 times as gas content in ejected coal. These are two different expressions of the same problem. To find the reasons for the decrease of outburst cavity volume and the increase of gas emission quantity per ton, by using the finite element code ANSYS, the damage zone and the failure zone of the outburst cavity were determined based on the static and dynamic combination method. In this paper, the reason for the decrease of the outburst volume was explained.
Design of a Cassegrain Optical System Transferring Intensified Sunlight to an Indoor GaAs Solar Cell
Authors: Chen Chien Yue , Huang Chien Sheng , Syu Jhih Ping , Chang Yi Sheng
Published: October 2011

Most solar cells are installed outdoors in order to receive as much sunlight as possible. Outdoor environment, however, is harmful to solar cells. Therefore, solar cells nowadays are well designed and able to work longer than 20 years. Besides improvements in sturdiness of solar cells, changes in structure of solar collector are also an effective way to prolong the lifespan of a solar cell. Thus, the research was aimed at the design of a solar collector that was able to transfer intensified sunlight to an indoor solar cell via a fiber bundle, so as to avoid dreadful environment. After being optimized by commercial optical software LightTools, the solar collector achieved a good efficiency, more than 20%, and had high tolerance to optical errors.
Design of Early-Warning System Model for Gas Explosion
Authors: Huang Dong Mei , Chang Xi Kun , Liu Ye Jiao , Wang Yan Min
Published: October 2011

Based on the prevention of gas explosion in colliery, and the risk early-warning theory, the characteristic and reason of gas explosion is analyzed. The accident model is proposed according to gas risk mechanism; then based on the accident risk early warning principle and the organization, combines the minds of safety scientific theory and decision theory, the accident model of early-warning for gas explosion is established. Finally, it analyzes and introduces each element, and indicates the implementation, which provide theory basis for safe early-warning on production.
Effects of Calcined Diatomite on Resistance to Permeability and Freeze-Thaw of Recycled Aggregate Concrete (RAC)
Authors: Wei Yong Qi , Meng Yun Fang , Sun Qing He
Published: October 2011

The sustainable development of human society makes necessary the research on and the use of RAC. For the purpose of enlarging its application range, both lowering cost and enhancing properties of RCA are worth being done. This paper aims at improving RAC’s resistance to permeability and freeze-thaw with a lower addition amount of calcined diatomite compared with silicon fume. Therefore, the main study on effects of calcined diatomite on resistance to permeability and freeze-thaw is carried out through comparison experiments. Research results indicate that the calcined diatomite of 2% added is able to decrease relative penetration coefficient by 59%, the strength loss by 4.9% and the relative strength loss by 3.3%. Obviously, the lower addition of calcined diatomite could achieve good effects, which arrived at the goal of this paper.
Numerical Simulation of Ship Oil Spill under Ocean Environment
Authors: Zhang Jia Ning , Liang Xiao , Li Wei
Published: October 2011

To clean the spilled oil from wreck ships and protect the marine ecological balance and prevent the damage to marine environment, the simulation of oil spill in deep water with the wave motion, wind and current was built in FLUENT platform. The dispersion and diffusion of oil spill in deep water was simulated dynamically. Also the oil spilling trajectories under the conditions of different current velocities, wavelengths and wind velocities were compared and analyzed, respectively. The results showed that the current, wind and wave decided the location and areas of oil films on the sea surface. The water depth influenced by the wave which increased with the increasing wavelength. Meantime, the areas of oil films on sea surface increased with current velocity decreasing, while the distance between the oil film and the source of oil increased. With the wind velocity increasing, the extended length of oil dispersion underwater and the oil film area on surface increased.
Numerical Simulation of ZnO Nanorod Assisted Light Extraction of Organic Light-Emitting Diode (OLED)
Authors: Song Juan , Yu Yang
Published: October 2011

In this paper, ZnO nanorod film has been constructed on the OLED emission surface to investigate its light-extraction enhancement effect. Similar to the ZnO nanorods film obtained experimentally by chemical bath method, the modeled ZnO nanorod film is also granted the randomly distribution characteristics. Major attention is paid to study the effect of the orientation of the ZnO nanorods on enhancement degree of light extraction. FDTD simulations indicate that the ZnO nanorods with a randomly oblique alignment can make more light extracted outside the chip compared to the ZnO nanorods possessing the rigorously vertical alignment. This conclusion shows that excessive requirement for excellent alignment of ZnO nanorods does not make any sense in optimization of OLED light emission. This makes optimization of light emission of LED by ZnO nanorods prepared through liquid-phase method much easier to implement.
Paraffin Deposition Test and Phase State Simulation for Dalaoba Condensate Gas Reservoir
Authors: Yang Min , Li Jun , Zhang Qi Min , He Jun Lian
Published: October 2011

The condensate gas reservoir of paraffin in Dalaoba is a kind of special and complex gas reservoir.High content of paraffin for condensate gas reservoir in Dalaoba and the deposition of paraffin seriously affect the production and safety to bring about greater economic loss.The method with combination of laser method and on-line filtering method for PVT high-pressure physical property shall be employed,and the simulated deposition method for paraffin precipitation phase state shall be established,therefore,the deviation between the simulated prediction results and experimental value for the paraffin precipitation point in Dalaoba is between 0.2°C~3.5°C to meet the precision requirement on engineering computation.
Research and Design of the Travel Information Service System Based on SOA
Authors: Ge Yun Sheng , Jian Xiao , Liu Yang
Published: October 2011

In the analysis of existing travel information service system of the main problems and travel information services on the basis of the relevant business processes, combining Service Oriented Architecture (SOA) the advantages. This paper proposes a method of travel information service system based on SOA overall design scheme. Its core content is SOA thought, as a theoretical guide in technical standard. The use of the existing AJAX, XML and Web Services, and other related technologies. For travel information services designed to service granularity. The scheme through a loose coupling, cross-platform system structure to reusing existing application system function module, easily incorporated into existing application systems to the new systems. Thus fully utilize existing resources.
Research on the Air-Fuel Ratio Intelligent Control Method for Coke Oven Combustion Energy Saving
Authors: Li Gong Fa , He Yuan , Jiang Guo Zhang , Kong Jian Yi , Xie Liang Xi
Published: October 2011

Coke combustion process, the constant proportion of the combustion air-fuel ratio control results in low combustion efficiency and fault-prone, difficult to adapt to changes in complex working conditions. Application of intelligent technology of case-based reasoning, fuzzy control, proposed for intelligent energy saving air-fuel ratio control method. Based on current trends in working conditions and combustion process in case of failure, predict the typical faults with case-based reasoning technology to the combustion process. On this basis, through case-based reasoning algorithm realize the real-time air-fuel ratio correction. Based on fuzzy-PID temperature cascade control we can obtain the appropriate flue gas flow and flue suction and realize the stability of the combustion process to achieve optimal control.
Research on Walling-up with Concrete Block Technology of Gob-Side Entry Retaining Based on Fully Mechanized Face in Medium-Thickness Coal Seam
Authors: Lin Hui Li , Shi Yong Kui
Published: October 2011

Gob-side entry retaining is an advanced and green mining technology, which can avoid using pillar and island working face, reduce driving workload, alleviate the tension between extraction and driving, and achieve a Y-type ventilation. The coal mine in this research successfully reserved a 485m roadway in No.10302 fully mechanized coal face by employing wide lane driving, pre-driven roadway, pre-controlling immediate roof in the roadway, and gob-side entry retaining by walling up with multi-standard concrete block using break-joint vertical stacking technology. From doing so, the supporting effect is significant, the roadway is integrated and the stable wall is free of distortion or cracking. This research paves a new way for gob-side entry retaining of fully mechanized mining in China.
Study on Preparation and Properties of Recycled Plastic-Poplar Plywood
Authors: Zhao Fang , Song Kun Lin , Gao Wei , Zhang Shuang Bao
Published: October 2011

In this paper, traditional adhesives were replaced by recycled plastics to make poplar plywood by hot-pressing. The results showed that the amount of recycled plastics made no obvious effects on the bonding strength, and the dry bonding strength reached the maximum with the amount of plastic film of 100g/m2. When the hot temperature was 150°C, the bonding strength no longer increased with the temperature, or even decreased. When the pressing time was 5 minutes, the bonding strength achieved the peak value, and then declined along with the extending of time. After testing, formaldehyde emission was found to be very low or zero. The new plywood is a kind of green and environmentally friendly wood-based panels. Above all, it could be concluded that the amount of plastic film of 100g/m2, the hot pressing temperature of 150°C and the hot pressing time of 5 minutes were the optimum process conditions in this experiment.
Study on Relationship between Partial Load and Rib Effect Coefficient of Refrigeration Heat Exchanger Used in Air Conditioning
Authors: Wang Hou Hua , Wang Hou Shuai
Published: October 2011

The relationship between thermal resistance ratio ζ(the ratio of thermal resistance between two sides of the tube wall) and load rate, according to heat transfer theory, is derived from simplifying the heat transfer model of heat exchanger. Considering the different running time of heat exchanger under variable load, the operation heat is proposed. Then the range of thermal resistance ratio for evaporator and condenser is determined and the law of thermal resistance is validated by analyzing the example. As a result, the relationship between rib effect coefficient and the thermal resistance ratio is established. Furthermore, value analysis of rib effect coefficient is analyzed. Results of this study show that the heat transfer performance of evaporator and condenser maximizes when ζ=1 at the partial load rate of (0.25, 0.50). Meanwhile, rib effect coefficient on the water side is less than that of the refrigerant side for evaporator and condenser.
Preparation and Performance of Bio-Adhesive Based on Acorn Starch Graft Glycidyl Methacrylate
Authors: Zhang Shi Feng , Zhou Lu Lu , Gao Qiang , Guo Xu Xia , Chen Li Ou , Han Chun Rui , Li Jian Zhang
Published: October 2011

For improving the performance of acorn starch (AS) based bio-adhesive, AS graft glycidyl methacrylate (AS-g-GMA) adhesive was prepared in this paper. The properties of the AS-g-GMA adhesive were studied by Fourier transform infrared spectroscopy (FTIR) and differential scanning calorimetry (DSC) measurement. The bonding strength of the plywood bonded by AS-g-GMA adhesive was measured according to Chinese National Standards methods to evaluate its water resistant. FTIR results indicated that GMA was grafted on the AS successfully. The bonding strength of the plywood bonded by AS-g-GMA adhesive showed lower curing temperature, better bonding strength, and water resistance comparing with that of control. The water resistant could reach type II grade (63°C water bath 3h) plywood requirement when the glycidyl methacrylate adding amount was 6% based on AS.
The Composition and Meaning of the Housing Additions in Taiwan
Authors: Song Hung Chi
Published: October 2011

The homeownership rate in Taiwan is 87.83% while the rate of the housing addition building is up to 65.9％[1]. It is common in Taiwan that residences constructed with additions are the ultimate form of home building, and those houses are mostly constructed with additions and the building are carried out after being purchased by the resident from the constructor. Neither permitted by the building rule nor designed by professional architects, those buildings are informal and do not conform to the contemporary aesthetic criteria. And in terms of the construction materials, the simple frame covered with a layer of sheet metal, such as iron sheet roofing, fails to provide thermal insulation materials particularly needed in subtropical Taiwan. This seems to be a construction myth on the surface, but the distinctive street landscape with squatter houses built everywhere has become a form of residence which reflects the life of common people [2]. Therefore, it is necessary to investigate the form of residence additions and the meaning behind such building behavior, and to further scrutinize its social value. The “residence mode” formed by the residence addition building serves as the basis for the investigation in this research; then “the spatial composition” and “the socio-cultural value” it carries are further discussed so as to provide a clear representation of the contemporary residential housing and its significance in Taiwan.
The Efficiency of Thermoelectric Chip by Different Heatsink
Authors: Jheng Wern Dare , Chen Shao Hsien , Lin Zhi Yu
Published: October 2011

In this study, aluminum nitride, boron nitride, copper, aluminum, with aluminum extruded heat sink as a cooling way of thermoelectric chip. Heat sink temperature change observed and measured the thermoelectric chip output voltage and current. The results showed that with the aluminum extrusion heat sink will increase the efficiency of thermoelectric chip. Copper + aluminum extrusion heat sink, the average electric power increased 173.93%, while the aluminum + aluminum extruded heat sink mean power increased 212.25 %, while the AlN + aluminum extrusion heat sink fins as mean power increased 197.5 %, And the BN + aluminum extrusion heat sink as a heat sink, the average electric power increased 266.17 %.
The Expression of Local Culture in the Design of Jinan Urban Traffic Environment
Authors: Liang Ming , Li Li , Li Yu
Published: October 2011

Urban traffic system in Jinan is an vital important sphere to show the city image，as well as a carrier for the local culture. With the development of various lifestyles, it is not merely ornamental, but a cultural experience. At the same time, when the local culture functionality is combined with functionality and times, in order to get a better understanding of it ,modern technology and materials is indispensable to the explore. In this way, citizens will be granted with a better aesthesis.
Analysis on Shear Lag Effect of Single Box and Double Cell Box Girders for Wei River Grand Bridge
Authors: Sun Lei , Hao Xian Wu , Lei Kang
Published: October 2011

In order to study the influence of shear lag effect of single box and double cell box girder on structure，to make the rigid frame continuous bridge of Wei River grand bridge as the research object, through the establishment of finite element model, the normal stress and shear lag coefficient of the control sections in various working conditions is calculated, and the distribution of the box girder normal stress under shear lag effect is obtained.
Application of Workpiece Image Enlarge and Shape Control with Quintic Spline Interpolation
Authors: Qu Ju Bao
Published: October 2011

The workpiece processing is sometimes necessary to obtain details of the magnified image. Especially in the CAD, CAM and CNC applications in the field. This article constructs a rational quintic spline interpolation, and interpolation used in the image to enlarge, by the five local parameter interpolation function has the shape control performance, making the image zoom in or out of, according to the need for control. Experimental results show that the interpolation functions of the five constructed in effect in the workpiece, surface shape control.
Dimension Optimization and Theoretical Calculation of Flywheel Rotor for Vehicle Energy Storage System
Authors: Zhang Xu , Cui Wei Wei , Li Li Wei , Cui Ji Jun , Cao Yang , Zhao Hai Rong , Li Song Yang , Hao Guo Quan , Feng Zhi Bing , He De Fang
Published: October 2011

A novel kind of flywheel energy storage system structure for vehicle is put forward and studied. Flywheel rotor dimension optimization is achieved adopting genetic algorithm on MATLAB program, optimized dimension is helpful for the realization of high energy storage efficiency. Based on certain uniform ring simplification of flywheel rotor shape and applying elastic mechanics solution, theoretical calculation of radial displacement and stress is accomplished. Solved radial displacement, radial stress and hoop stress can be applied in practice for further precise design in the view of mechanical strength.
Research on Knowledge Fusion Based Parametric Design Technology of the Sliding Screw Mechanism
Authors: Wang Dong Mei
Published: October 2011

The simultaneous application of Logical reasoning and model design in parametric design technology based on Knowledge fusion in the interactive process of CAD system, makes design process are creative; its key technology includes the building of knowledge model base, the reasonable representation of knowledge items and knowledge constraints, correct establishment of the relation among knowledge item and knowledge constraint reference variable; the paper studies the key technology in parametric design based on Knowledge fusion, expresses the application in sliding screw mechanism of the software based on the key technology, and finally gives an example of parametric design technology of sliding screw mechanism based on Knowledge fusion.
Experimental Modal Analysis of Compressor Vibration Isolating System Based on LMS Test.Lab
Authors: Zhang Li , Chen Hao , Gong Yan Jue , Wang Jing
Published: October 2011

In order to reduce vibration and noise of the compressor used in small and medium-sized refrigeration unit, this paper designs different vibration isolating systems and carries out experimental modal analysis based on LMS Test. Lab Impact Testing software. The comparison results of modal parameters of four different vibration isolating systems show that the natural frequency of single-layer vibration isolating system is higher than that of non-isolation system and effectively avoids the second order resonance frequency. Furthermore the natural frequency of double-layer vibration isolating system has reduced due to the additional middle-mass. And the system's natural frequency decreases obviously with the increase of middle-mass which is far from resonance frequency and significantly improve the effect of vibration isolating system.
Analysis on the Detection Capacitance of Comb Micro-Machined Gyroscope
Authors: Liu Hai Peng , Gao Shi Qiao , Jin Lei
Published: October 2011

The micro-machined gyroscope is a kind of typical micro-electro-mechanical sensor, its typical working mode is electrostatic drive and comb capacitive detection. As for as the transverse detection capacitance structure now commonly used, we find out that the relationship between capacitance variation and displacement is nonlinear through analyzing its detection capacitance. This nonlinearity will greatly affect the dynamic performance of micro-machined gyroscope.
FPGA Auto Configuration Based on ATE
Authors: Liu Qian , Wu Dan
Published: October 2011

FPGAs (Field Programmable Gate Arrays) are highly integrated devices which can be programmed as variable functions. The application-level testing of FPGAs usually include multiple reconfigurations and relevant functional tests respectively through ATEs (Automated Test Equipments). However, test engineers are facing a tough problem to reconfigure FPGAs automatically through an ATE instead of using specific tools and download cables provided by FPGAs manufacturers. This paper takes example for XILINX Virtex-E series, presents two different methods for FPGA auto configuration based on an ATE using JTAG configuration interface and boundary-scan protocol, and accomplishes the entire auto configuration-test procedure by a single ATE.
FEM Analysis of Engine Crankshaft Static and Dynamic Behaviour Using ANSYS
Authors: Fu Ze Min
Published: October 2011

By means of FEM using ANSYS, this paper set up a three–dimensional model by using Pro/E for model S195 diesel engine’s crankshaft corresponding to practical conditions . The distortion and stress of the crankshaft was investigated . The fatigue strength of crankshaft was verified under changing load . The rationality of crank stress analysis method, which is in current widely used, was discussed . The model analysis was made for the crankshaft , and provide the valuable theory basis for engine design optimizing and improving .
Industrial Trial Production of X70 Pipeline Steel under Ultra Fast Cooling Conditions
Authors: Tian Yong , Tang Shuai , Wang Guo Dong , Wang Pu
Published: October 2011

A successful ultra fast cooling (UFC) technology has been applied to the plate rolling production line in Shouqin Metal Materials Co.Ltd.. Industrial trials are reported for the production of X70 pipeline steels (about 70000 t) under UFC conditions. Pipeline steels with reasonably good properties have been produced on an industrial scale. UFC improves the temperature uniformity, the mechanical properties and the plate profile of X70 pipeline steel. The impact values of X70 pipeline steel at UFC mode exceed the standard requirements of X80 pipeline steel. The productivity is enhanced because cutting quantity of head and tail of the plate is reduced. The enhancement of control accuracy of the red back temperatures is favorable for industrial production of X70 pipeline steel. The reduced production of the steel-making has been industrialized achieved, since a new composition was designed by reducing the vanadium content to less than 0.045wt.%.
Observer Based Speed Control of PMSM Servo Systems
Authors: Huang R.N. , Song Cheng , Lou Yun Jiang
Published: October 2011

A speed observer which is consisted of the full order state observer and Kalman filter was designed to estimate instantaneous speed in this paper. It utilized full order state observer to obtain load torque and position information, and combining with electromagnetic torque as the input of Kalman filter. Simulation results show that this method can improve the speed detection accuracy of the PMSM servo system.
Point-Line Meshing Gear Drive
Authors: Huang Hai , Li Hai Xiang , Luo Qi Han
Published: October 2011

Point-line meshing gear is a new-styled gear characterized by both easy manufacturing and divisibility of involute gears and high strength for contacting between convex and concave tooth profiles of a circular-arc gear. And contact strength of point-line meshing gears has improved by 1~2 times in comparison with involute gears, and bending strength of such gears has improved by approximately 15%, while noise has decreased even by 5～10dB (A). In addition, with the increase of load, noise will decrease by 3~4 dB (A). Only a few teeth or even 2~3 teeth are required for a pinion gear. There are single point-line meshing gears (equivalent to single arc gear), double point-line meshing gears (equivalent to double arc gear) and few-tooth point-line meshing gears, totaling three kinds, which are widely used in reducers for metallurgy, mining, craning, transport and chemical industries. And the three kinds of gears can be converted into soft tooth-flank, medium tooth-flank and hard tooth-flank gears. Here the types, characters, meshing features and dimension calculation of point-line meshing gears are described.
Reseach on Back-Pressure Problems of the Twin-Scroll Compressors
Authors: Meng Ya Nan , Gao Wei Ping
Published: October 2011

By analyzing forces acting on moving scroll, a new calculation model of overturning moment is proposed, and the principle of opening the back-pressure hole is derived. The formula of crankshaft angle is given when the back-pressure hole is completely covered. The calculation results of dynamics are shown that the back pressure is almost inversely proportional to the center corner of the back-pressure hole. The results can be double-vortex ring compressor design and direct application of the study.
Study and Implement on the Control System of Traction Locomotive Based on Torque Current Closed-Loop
Authors: Zong Jian , Ruan Yi , Chen Ming Hui , Xu Li Bo
Published: October 2011

In order to overcome the poor stationarity of traction locomotive during the operation mode switching, with rotor flux oriented vector control theory based on, torque model control strategy is adopted. It can overcome the DC bus pumping as Locomotive deceleration and barking. In this system, output torque can be controlled directly, experiments verify the system has good performance of stability and reliability, which can meet the traction locomotive control requirements.
Research on Tensile Strength of Wood Single Lap Gluing Joint
Authors: Lu Wei , Hu Ying Cheng , Shen Jun , Yao Jia , Li Jin
Published: October 2011

The tensile strength of joints is one of the most important indexes which can affect joint quality. The effect of gluing length, specimen width and thickness of wood single lap joints on the maximum tensile load and tensile strength has been researched through the experiment method. The maximum tensile load increases with the increase of gluing length, specimen width and thickness, but the increase degrees are different; the tensile strength is consistent with the increase of gluing length, but does not change obviously with the increase of specimen width and even decreases with the increase of specimen thickness. The conclusions of this paper will have guiding significance for the design of wood single lap joints.
TCA Principe and Application of the Double Circular Arc Tooth Spiral Bevel Gear
Authors: Zhang Rui Liang , Wang Tie , Wu Zhi Fei
Published: October 2011

Tooth contact analysis (TCA) is an effective tool for meshing analysis of the double circular arc profile spiral bevel gear (DCAPSBG), and it is the basis of loading tooth contact analysis and finite element analysis. The TCA application is developed by Visual Basic and MATLAB mixed programming method, this paper compared the results of the TCA application analysis with the results of contact area check experiment on one pair of gears with given parameters. The TCA application had been verified by real experiment, this provided an effective approach for the design of DCAPSBG.
The Application of GPS Principle in the Accuracy Detection of NC Machine
Authors: Wang Jin Dong , Guo Jun Jie , Guo Bao An , Wang Hong Jian
Published: October 2011

How to quickly and accurately detect the error of NC machine has become a hot issue for domestic and foreign scholars. Based on GPS principle, a laser tracker is adopted the multi-station and time-sharing measurement to rapidly and accurately detect the geometric accuracy of NC machine. The machine is controlled to move in the preset path, and a laser tracker is used to measure the same motion trajectory of the machine successively at different base stations. The position of base station and the space coordinates of measuring points can be determined based on large amount of measured data. The algorithms of multi-station and time-sharing measurement are given, and the influencing factors of measurement results are discussed in the paper. Meanwhile, a detection system of machine error is developed based on the platform of Matlab, which can quickly process the measured data and shows each error of machine intuitively.
The Research and Development of Mechanical Product Turning Processing Cost Estimation System
Authors: Huang Wen Quan , Li Kai Shi , Liu Hai Jun
Published: October 2011

This paper adopts the method labor time standard, in the development environment of VC++, using Access database storage costs data, and the cost results output into Excel, developed mechanical product turning processing manufacturing cost estimation system. Using this system can realize turning processing cost estimation and feedback the cost information of mechanical product turning processing, make a design personnel to understand the cost information, to improve design, reduce the cost, improve the market competitiveness of products
The Research of Anti-Seismic Control Experiments of Spatial Reticulated Shell Structures
Authors: Wang She Liang , Chen Zhuo , Fan Yu Jiang , Ma Qian Ying
Published: October 2011

The large spatial reticulated structures belong to vibration and defects sensitive structures when vibrations will be easily produced under dynamic loading actions, and dynamic failure accidents will be caused. The application of the piezoelectric smart material in structural vibration control was researched with the shaking table test of active seismic control simulation of the spatial reticulated shell model structure.The results show that the piezoelectric actuators optimally arranged can effectively decrease earthquake responses of the structure, so it is a good active seismic control method.
Simulation Study on Influence of Forming Process Parameters on Backward Extrusion Height of 6061 Aluminum-Alloy Wheel
Authors: Li Lu , Wang Fang
Published: October 2011

Backward extrusion process of aluminum-alloy wheel forging is analyzed by the finite element method. The influence of punch speed and forming temperature on the backward extrusion height of 6061 aluminum alloy wheel is discussed. Studies show that the backward extrusion height increases with increasing forming temperature, and with decreasing punch speed at the same deformation load. It is indicated that when the ranges of forming temperature is from 450 to 500°C and the punch speed is 0.5-1 mm/s, the aluminum alloy wheel has the optimal forming quality. The analysis and conclusions in this paper are helpful in developing the hot extrusion technology specification of 6061 aluminum alloy.
Tie Rod Preload Analysis of a 100MN Hydraulic Press
Authors: Zhu Pei Hao , Zhang Lian Hong , Yu Bing , Xie Qi Zhi
Published: October 2011

The classical preload design method of prestressed frame of hydraulic presses is based on the assumption that the beams of the frame are rigid, which is not agree with practice. In order to eliminate the unbalance load of the frame of a 100MN hydraulic press due to improper prestressing, tie rod preload distribution in prestressing of the frame is researched with respectively mechanics of materials and the finite element methods. According to mechanics of materials and finite element analysis results, reasonable tie rod preloads and sequence of preloading are obtained and the unbalance load of the frame of the hydraulic press is solved. It also provides references for the preload design of prestressed frame of hydraulic presses.
Time Delay Model of Fractional Fourier Transform and the Application in Signal Filtering
Authors: Wang Yuan Gan , Yu Hong Lin , Liang Xin Yu
Published: October 2011

Various frequency bands of noises are contained in the actual signal. And it's difficult to eliminate the noise portion, which has a time delay and same spectrum with the original signal with conventional filtering methods. Based on the time delay and the multiplication delay characteristics of the fractional Fourier transform (FRFT), we put forward a FRFT time delay model, which can increase distance between the signal and the noise component. Through corresponding Fractional Fourier Transform to noise-containing signal, the distance between the signal and common frequency noises can be constantly increased within the transform domain, thus easily separating the noise component. The algorithm of the model can be simply deduced, easy realized and converged fast. In the experiment, we simulated the separating characteristics of the transform, and used the method to de-noise the grating signal. Compared with other traditional methods, we find that the FRFT acquired a better result.
Fracture Mechanics Study on Subsurface Median Crack in Layered Structure Subjected to Mechanical Contact
Authors: Bao Yu Mei , Lv Jun , Zhang Ying Jun , Xu Mei Feng , Chai Guo Zhong
Published: October 2011

The subsurface transverse median crack system due to spherical contact in brittle coating-bond -substrate sandwich structure is investigated with an emphasis on stress intensity factor near the crack front using finite element method. This crack system emanates from the lower surface of the brittle layer and extends transversely towards the top of contact surface, resulting in ultimate failure of the structures. In this paper, finite element mesh is designed, and the crack front mesh designing solution for a surface crack subjected to remote tension is validated with Newman and Raju empirical equation. Then the proposed crack front mesh design solution is applied to a typical sandwich structure of various modeling parameters to obtain the SIF with 3D-J integral.
Research on BLDCM Speed Control System Based on MFNN-PID Control Method
Authors: Wang Xin
Published: October 2011

It is very difficult to solve brushless DC motor(BLDCM) overshooting and short time oscillation during keeping speed of BLDCM.In view of shortages of normal PID controller, Modified Fuzzy Neural Network adjusting PID parameters and its Algorithm are researched.The MFNN’s computation and convergence rates are better than FNN adjusting PID parameters.At last,mathematical expression of MFNN adjusting PID parameters is given.With Matlab sumulation,conclusion is the MFNN adjusting PID parameters is better in BLDCM speed control system robustness and real-time to solve interference of the system than PID controller and FNN adjusting PID parameters.It is fleasible to take the MFNN adjusting PID parameters in BLDCM speed control system.
A Multi-Target Synthetic Assessment Approach for Information Systems Security Risk
Authors: Feng Nan , Xie Jing , Wu Ying Xin
Published: October 2011

Increasing organizational dependence on the IS has led to a corresponding increase in the impact of information systems security (ISS) abuses. In this paper, we propose a multi-target synthetic assessment approach for ISS risk based on neural network. Firstly, an assessment system of ISS risk is established. Secondly, a trained neural network can endue the assessment approach with expert assessment knowledge in the way of joint weight, through its learning and adapting capability. Finally, the approach is capable to simulate expert assessment method by verifying the data of ISS risk assessment.
A Fast GPU Algorithm for the Inverse of a Circulant Matrix
Authors: Zheng Zuo Yong , Zhang Rui Xia
Published: October 2011

Circulant matrix is a special case of Toeplitz matrix, which is widely used in many domains of specialization, especially in image and digital signal processing. Calculating the inverse of this category of matrices consists of the following three steps: (1) transform the first row vector to frequency space by using DFT; (2) calculate the inverse of each amplitude in the spectrum; (3) apply IDFT to the adjusted spectrum and reconstruct the inverse of the original circulant matrix. This paper implements such a fast algorithm on the GPU, which is proved around five to ten times faster than is executed on the CPU.
A Study on Optimization of Automotive Suspension Base on PSO-BP Network Algorithm
Authors: Jiang Chang Song , Li You De , Wang Zhong Dong
Published: October 2011

A BP neural network algorithm which bases on the particle swarm optimization（PSO） is advanced in this paper, Thus formed the PSO-BP network algorithm. It makes use of PSO to reach the global optimization of BP neural network’s weight value and threshold value，and the optimized BP network is used to optimize the automotive suspension. Simulation results shows that this algorithm can improve the weak points of the BP learning algorithm such as the slow convergence rate and the poor global covergence. It can also reduce the number of training and the error obviously.
Blow Molding Process Optimization of Amorphous Alloy Tube Blank Based on POLYFLOW Software
Authors: Guo Yu Qin , Yang Xin , Han Juan Juan , Chen Wei
Published: October 2011

Aimed at Zr44Ti11Cu10Ni10Be25 amorphous alloy and based on POLYFLOW software, studies the influence of die inlet diameter, blowing pressure and die transition fillet on the blow molding performance of tube blank systemly, and raises a new evaluation index to evaluate the formability of amorphous tube blank, limit height to diameter ratio (LHTDR) . The simulation results indicate that the forming limit of tube blank can be multiple improved with the decrease of die inlet diameter, blowing pressure has a significant effect on the forming limit which can be improved by decreasing the pressure, and the larger of the die transition fillet the higher of the forming limit in certain range. Finally, a set of reasonable process parameters is given which has great significance for guiding the formulation of blow molding process scheme.
Characterization of Anatase Coatings on NiTi Shape Memory Alloy by Plasma Electrolytic Oxidation Method
Authors: Lu Li Hong , Zhang Jing Wu , Shen De Jiu
Published: October 2011

The anatase coatings was obtained by aqua regia dealloying and plasma electrolytic oxidation (PEO) method on NiTi shape memory alloy (SMA) substrate. The PEO manufacturability of NiTi SMA before and after dealloying was researched. The PEO surface morphologies of the aqua regia treated and untreated specimens were investigated with scanning electron microscopy (SEM). The composition of the PEO coatings was investigated with X-ray diffraction (XRD). The element concentration of the surface of the PEO-treated NiTi SMA was measured by an energy dispersive X-ray spectrometer (EDS). The results indicate that the pre-treatment technology by aqua regia dealloying can greatly improve the PEO manufacturability and the PEO morphologies of the NiTi SMA. The optimum dealloying parameters are at room temperature for 10 min. At this circumstance, the PEO manufacturability of the treated samples is most close to that of the industrial pure titanium. There are many honeycomb-like micro-pores in the surface of the PEO coatings, which act as discharging channels. The cracks are invisible in the SEM images of the PEO coatings. The PEO coatings formed on the NiTi is composed of Ti, Ni, Al, O, Au and P. The composition of the PEO coatings is mainly composed of NiTi phase and anatase phase.
Comment on Xu et al.'s Key Agreement and Password Authentication Protocol
Authors: Guo Yong Ning , Liu Cheng Lian
Published: October 2011

The Internet has been population, which it was implement information technology, to every enterprize, also changed their contact mode of information flow style. Since public key conception was proposed, it had authentication function to secure while they are communication, and defense the data to leak based on stranger. In 2010, Xu et al. proposed an improvement of generalized key agreement and password authentication protocol which it based on linear equation in two unknown of congruence. In this paper, we pointed out some errors. Thus, the Xu et al.'s improved scheme may not becomes to be correction
Error Compensation Method of Harmonic Analysis for Time Grating Sensor
Authors: Chen Zi Ran , Peng Dong Lin , Zheng Yong , Zheng Fang Yan , Zhang Tian Heng
Published: October 2011

Due to the complexity of measurement system, it is hard correct errors by using traditional error separation and error tracing technology. To reduce the production cost and improve the measurement accuracy, a novel error compensation method based on harmonic analysis is presented in this paper. In this way, high precision time grating sensors can be manufactured with low precision mechanical machining method. The experiment results prove that errors can be reduce within ±2″.
Studies on the Relationship between Morphology and Water Flux of PVDF/PU Blend Membranes
Authors: Huan Guo Lan , Liu Jian Li , Du Qi Yun , Hu Xiao Yu
Published: October 2011

Polyvinylidene fluoride/polyurethane (PVDF/PU) blend membranes were made via immersion precipitation process, the surface morphologies and the micro-porous structures of the blend membranes were analyzed using scanning electronic microscope (SEM) and fractal theory, the water flux change with the operation pressure of the blend membranes was investigated, and the relationship between blend membrane morphology and water flux was discussed. The results showed that, the water flux of the resulting blend membranes was increased, and the contribution of different structures to water flux was in the following order: cross-section finger-shaped porous defects > cross-section through holes > blend membrane surface pores. In addition, water flux of the blend membranes was also related to the deformability of PU.
Design of MOD-CAN Interface Card Based on OPC Technology
Authors: Xu Hui Pu , Yao Xiao Feng
Published: October 2011

The actuality that SHCAN2000 system relies on FIX configuration software has limited its application scope significantly. In this paper, the interface card what accord with OPC specification was realized through applying LM3S8962 microcontroller and OPC technology, the opening performance of data acquisition system was greatly improved, which can effectively avoid the repeatability of development process and incompatibility of many integrated software systems, at the same time, the standardization of hardware and software was also fulfilled the requirements. The improved Field Bus control system has a broader application prospect in industrial control field.
Development on Digital Circuit Network Virtual Lab System Based on LabVIEW
Authors: Ran Bao Chun , Lin Sui Fang , Li Zheng , Bai Jing Yi
Published: October 2011

With reference to the current situation of experimental teaching of Digital Electronics Course, the thesis puts forward the proposal of Digital Circuit network Virtual Lab System, describes the method of setting up network virtual lab with the application of LabVIEW virtual instrument. The system provides the accessibility to lab anywhere via network which improves the Laboratory equipment Utilization greatly and lowers the laboratory cost accordingly.
A Trustable Approach Based on Fuzzy Inference for P2P Systems
Authors: Sun Hua , Li Li
Published: October 2011

Trust management is one of the key problems in the P2P systems and e-commerce. Before they have the transaction, people always want to know whether the other side of the transaction partners can be trusted and how much degree of their trustworthiness. This paper proposes a trustable approach based on fuzzy inference in P2P systems and gives a detail discussion of fuzzy inference. They can inference their trust against the trustworthiness of the rules and compute the trustworthiness of the conclusion. This approach is adapted to the P2P environment which the rule and the proof which may be showed as fuzzy, and the approach also have practical meaning for us to build an effective P2P system.
Intelligent Correction of Shift Schedule for Dual Clutch Transmissions Based on Different Driving Conditions
Authors: Liu Yong Gang , Qin Da Tong , Lei Zhen Zhen , Ding Rui
Published: October 2011

This paper focuses on intelligent correction of shift schedule for dual clutch transmissions based on different driving conditions. The problem of standard shift schedule has been presented, and the strategy has also been proposed to avoid shift hunting and unexpected shift. The driver’s intention and driving environment have been unified recognized as different driving conditions. A fuzzy logic technology has been used in driver’s attention recognition based on the throttle opening and its derivative. The standard shift schedule has been intelligently corrected at different driving condition separately. An algorithm based on correction coefficient of throttle opening and vehicle speed is proposed for intelligent correction. The corrected shift schedule can be directly used in real time shift control with suitable correction coefficient.