bluuebunny/crossref_metadata_2025 huggingface dataset:
Using Interpolation Points to Rectify Cutter Paths of Five-Axis Machining
Authors: Lin Tsong Der , Lin Alan C.
Published: March 2013

When operating a 5-axis linear cutting command G01, the controller automatically inserts point data between two NC blocks in a linear distribution fashion, and then drives the cutter along these inserted points. If a simultaneous 5-axis machining is initiated, and CL data is directly transformed one-to-one into NC data, and then cutting is performed directly without having the 5-axis controller inserting any points between NC blocks, its processing path will deviate from the original plotted path. In fact, the processing path is no longer a straight line, but a curve line. This study proposes a method to increase CL interpolation points to automatically rectify the path deviation. The extent of research of this study comprises: (1) Transforming CL data into NC data (2) Programming tool orientations (3) Obtaining all CL interpolation points and their tool orientations (4) Generating NC data.
Automatic Side-Cores Construction in Injection Plastic Mold Design for Free-Form NURBS Surface Models
Authors: Quang Nguyen Huu , Lin Alan C.
Published: March 2013

In computer-aided design for moldings, automatic generation of side-cores is a crucial design task that has an influence on the entire mold structure and manufacturing cost. This paper proposes a synthetic approach for creating the side-cores of free-form NURBS surface models. Based on the geometric properties of entities, surfaces of undercut features which are molded for side-cores are identified. After determining the withdrawal directions for each group of undercut’s surface features, the number of side-cores is optimized. The heads and the bodies of side-cores are finally obtained through the combination of the Boolean operation and 3D oriented extrusion. The algorithm is efficiently for both protruded and indented portions of undercut features. A complex industrial part is used to demonstrate the performance and robustness of the proposed algorithm. Since the approach is generic in nature, it is easy to be applied to any complex geometry in 3D mold design.
Starting Energy Dissipation of Traffic Flow with On-Ramp
Authors: Xiao Lan , Pan Wei , Xue Yu
Published: March 2013

The starting energy dissipation of on-ramp system with open boundary condition is investigated by means of cellular automata simulations. We study the influence of the injection rate of on-ramp, the injection rate of main road and the removal rate of main road on the starting energy dissipation of each road. It is found that even though the injection rates neither of on-ramp nor main road have influence on the starting energy dissipation when critical values achieved, the removal rate of main road has a major impact on the starting energy dissipation of the system all along.
Research and Analysis of Active Earth Pressure on Retaining Walls with Layered Non-Cohesive Backfills
Authors: Jiang Xi Yan , Zhou Zhan Xue
Published: March 2013

Based on the method of level-layer analysis , with the sliding harmonious condition of layered backfills considered , the theoretical answers to the unit earth pressures , the resultant earth pressures and the points of application of the resultant earth pressures on retaining walls with layered non-cohesive backfills are set up . The comparisons are made with Coulomb’s formula.
Research on Low-Carbon Development of Energy Mix in Shaanxi Province Based on System Dynamics
Authors: Xia Wei Li , Li Xiao Ge
Published: March 2013

Low-carbon development of energy mix plays an important role in changing the development mode of Shaanxi Province, adjusting the industrial structure, promoting green development low-carbon life, and properly dealing with climate change. This thesis selects the system dynamics method, built the system dynamics model of the energy consumption. Model selected 28 variables, through the test of history, obtained future data. Finally, put forward the relevant recommendations of the energy structure of low-carbon development in Shaanxi Province.
Study and Identify on the Best Reserve Quota of Maintenance Spares
Authors: Shao Yan Jun , Pan Hong Xia , Ma Chun Mao , Liu Yong Jiang
Published: March 2013

Identifying the reserve quota of maintenance spares is an important foundation work in spare parts management. The higher the reserve quota of maintenance spares, the higher the service level, accordingly, stock funds occupied more. It is also a kind of large waste for the enterprise. Therefore, it is becoming more importance for making the best reserve quota. In this work, it was based on the consuming law of maintenance spares that the mathematical model was established, so service level of maintenance conditions was identified according to that. The best reserve quota was identified depend on the relationship between service level of maintenance condition and the best service level.
On Interior Greening Decoration of Residence
Authors: Zhou Ming
Published: March 2013

Endless nature energy has been brought into rooms by green plants. The paper reports on the function of interior greening decoration, the principles to follow and various functions of rooms with greening decoration technique from various angles. It concludes that it becomes an important measure for people to improve their living environment and create a harmonious living space of buildings, people and nature by interior greening decoration for rooms with dexterity.
Analysis on Navigation Reliability of Curved Channel
Authors: Ai Wan Zheng , Gan Xue Zhen
Published: March 2013

Accidents happen easily in curved channel where flow pattern is very complex. The factors which affect accident’s happening in curved channel are analyzed; navigation reliability model is put forward and advices are given for improving navigation reliability in this paper.
Experimental Study on the In Situ Mechanical Properties of Methane Hydrate-Bearing Sediments
Authors: Sun Zhong Ming , Zhang Jian , Liu Chang Ling , Zhao Shi Jun , Ye Yu Guang
Published: March 2013

TDR was introduced to solve the problem of how to measure hydrate saturation accurately. Then a series of un-drained triaxial tests were carried out on methane hydrate-bearing sediments under various conditions with effective confining pressures at 1, 2 and 4 MPa, average hydrate saturations at 15.71, 35.7 and 56.49% and strain rate at 0.8%/min. The results indicate that the shear strength increases with the increases of effective confining pressure and hydrate saturation, but the maximum failure time decreases with the increasing effective confining pressures. According to Mohr-Coulomb failure criterion, the shear strength of methane hydrate-bearing sediments was analyzed. It can be found that the internal friction angles are not sensitive to hydrate saturation, but the cohesion shows a high hydrate saturation dependency.
Study on Boundary Depth and Critical Shear Wave Velocity of Saturated Loess Foundation Liquefaction in Different Regions
Authors: Wang Ping , Wu Zhi Jian , Wang Qian , Wang Jun
Published: March 2013

Use of Seed’s simplified liquefaction evaluation method, combined with the dynamic triaxial test results, and the wave velocity of site liquefaction, to evaluate liquefaction potential of the four typical loess sites under the action of different seismic magnitudes, and calculate the boundary depth of the liquefaction site. Moreover, give the corresponding relationship between the typical loess site liquefaction boundary depth and shear wave velocity, and get the critical shear wave velocity of typical loess liquefaction site. The results of the study show that, (1) saturated loess site could be liquefied under the action of a certain intensity earthquake. (2) saturated soil layers which do not produce liquefied under the action of 6.5 degree earthquake, its critical shear wave velocity is about 227 m/s, and under the action of 7 degree earthquake its critical shear wave velocity is about 303 m/s, under the action of 8 degree earthquake its critical shear wave velocity is about 379 m/s. This conclusion enriches and develops the basis of liquefaction potential evaluation in the loess region.
The Analysis on the Starting Friction Torque Increase of Magnetic Fluid Revolving Sealing
Authors: Cai Yu Qiang , Xing Na
Published: March 2013

Abstract. Magnetic fluid revolving sealing is widely used in modern industry. In the process of application, it is founded that the starting friction torque is very large, particularly at lower temperature. This problem has become a key factor restricting the application of magnetic fluid rotation sealing. In this paper, the mechanism of starting torque increase is analyzed, based on the change of microstructure and its viscosity. After analysis , such conclusion is obtained , which can be described: to a certain sealing structure, the type of magnetic fluid, size distribution of magnetic particles as well as the working condition concluding temperature, magnetic field gradient and the revolving velocity of shaft is the main influence factor of starting friction torque . It is very useful to reduce the starting friction torque.
Design Methodology and Unsteady Aerodynamic Characteristics of a Rectangular Variable Geometry Hypersonic Inlet
Authors: Teng Jian , Yuan Hua Cheng
Published: March 2013

Design methodology of a rectangular variable geometry hypersonic inlet whose cowl lip is translatable along flow direction is clarified in current study and recommendation of key design parameters are given. Unsteady Reynolds-averaged Navier-Stokes (uRANS) calculation were carried out to investigate the feasibility and unsteady aerodynamic characteristics of this inlet. Results indicate that by stretching the movable lip of a model inlet upstream, mass flow rate will increases apparently due to the increases of inlet internal duct entrance area. Stretching the movable lip upstream will decrease CR of the model inlet which is favorable for the start or restart of the inlet from an unstarted status. The lip translating process is smooth and will not induce large amplitude flow disturbance within inlet duct. The movable lip is conducive to improve the aeropropulsive performance of the hypersonic inlet in wide flight range
Numerical Study of the Influence of Waving Bottom on the Fluid Surface Wave
Authors: Wu Zheng Ren , Mo Chong Yuan , Zhu Yong Xin
Published: March 2013

The effect of waving bottom on the fluid surface wave was investigated. Starting from the basic equations of potential flow theory and boundary conditions, we used the multiple scales perturbation method to deduce fluid surface waves satisfy the first-order approximate equation and second-order approximate equation. Under the second-order approximation, the fluid surface waveform was simulated with the Matlab in the presence of different waving bottom form. The results show that there are three solitary waves on the surface of the fluid. With the development of time, the amplitude of each solitary wave has not changed. It seems that they are not affected each other and propagate independently. So it suggests that the waving bottom is effective for maintaining surface wave energy balance income and expenditure in spreading process.
Numerical Investigation of Vortex Shedding Modes of Flow past Two Circular Cylinders in Side-by-Side Using Immersed Boundary Method
Authors: Song Li Wei , Wu Song Ping
Published: March 2013

The vortex shedding modes of flow past two circular cylinders in side-by-side arrangement are investigated numerically in this paper. The simulations are carried out using a ghost cell immersed boundary method which imposes the boundary condition through reconstruction of the local velocity field near the immersed boundary. The two-dimensional unsteady incompressible Navier-Stokes equations are solved using an implicit fractional step method based on cell-center, collocated arrangement of the primary variables. Vorticity contours of the flow around the cylinders and force time histories are presented. Anti-phase and in-phase vortex shedding modes were found to exist in the flow simulation. These results of simulations were in agreement with phenomena observed in experiment and numerical results of previous researchers.
Comparative Study of Synthetic Jet Numerical Simulation Methods
Authors: Tang Shang Qin , Huang Chang Qiang
Published: March 2013

In order to find the best synthetic jet model for active flow control numerical simulation study, exit velocity model, simply connected domain model and moving boundary model were researched through solving the two dimensional transient Reynolds Average Navier-Stokes(RANS) equations under consistent grid and boundary conditions. Velocity and vortex characteristics of flow field were got. Three models were all able to capture the velocity characteristics compared with experiment data. The moving boundary model can capture the distribution of vortices accurately and was the ideal model for applications, because it considered the spatial distribution and time distribution of diaphragm motion, also because it included the volume change rate of actuator cavity.
Equilibrium Characteristics of High-Speed Train in Crosswind
Authors: Deng Yong Quan , Li Tian , Zou Yi Sheng , Zhang Ji Ye , Zhang Wei Hua
Published: March 2013

A fast approach to high-speed train co-simulation between aerodynamics and train-track coupling dynamics is presented. With this method, the fluid-structure dynamic performances of a high-speed train are simulated with different crosswind velocity and train velocity. The aerodynamic forces and train dynamics are compared under off-line simulation and equilibrium state method. Considering the fluid-structure interaction, there is significant influence on the head aerodynamics and train dynamics. The results show that it is necessary to consider changing attitude in crosswind
Numerical Simulation of Double Inlet Cylinder Cyclone Using CFD
Authors: Yuan Xiao Ming , Zhao Hui Jun , Qu Jing Yi
Published: March 2013

Designed a new type of double inlet cylindrical cyclone. For search the separation performance in a cylindrical cyclone. By use of CFD，applied the RSM turbulence model and Euler two-phase flow method and ASM which to simulate separation process and flow field within a double inlet cylindrical cyclone. Then compared with the single inlet cyclone，obtained velocity distribution. Analyzed the differences of discrete phase volume fraction between different viscosity. The results show that the new-style cyclone caught more stable fluid field and higher separation efficiency. And when the viscosity is about 0.75 kg/m•s， the separation efficiency and stability of the oil core is higher. Preliminary flow field law is shown up.
Extrusion Uniformity Optimization for Shaping Channel Design in Large-Scale Die-Plate of Underwater Pelletizing
Authors: Zhang Bing , Liu Xiao Feng , Bi Chao
Published: March 2013

As an important component of large-scale extruder system for polymer material, Die-plate can be regarded as the final determinant for pelletization uniformity. Polymer melt was shaped in shaping channels and extruded from die-holes from Die-plate and then be diced. The design of shaping channels directly influences the uniformity for polymer-melt extrusion pressure and extrusion velocity of different die holes. In this paper, a three-dimensional flow model for polymer flow in Die-plate channel was presented, and then finite element simulation was used to analyze the distribution of extrusion velocity in each die-hole. Based on simulation result, a BP neural network model was applied to analyze the relationship between geometry factors of Die-plate, such as length of shaping channels, die hole extrusion velocity distribution, and extrusion uniformity. This optimization method can be used in the design of Die-plate to improve effect and quality of actual polymer production and processing.
Stability Parameter H of the Flow of Power-Law Fluid in Annulus with the Inner Cylinder Executing a Planetary Motion
Authors: Zhang Shu Yun
Published: March 2013

The governing equations and mathematical model of the stability parameter H are given in bipolar coordinate system when power law fluid flows in annulus with the inner cylinder executing a planetary motion in this paper. The stability parameter H of power law fluid in both wide clearance and thin clearance in annulus with the inner cylinder executing a planetary motion is numerically calculated by finite difference method, the influences of the revolution velocity, rotation velocity, the eccentric distance and the pressure gradient on the stability parameter are analyzed. The results indicate that the eccentricity and the pressure gradient are main influence factors on it. The critical value of stability parameter for the flow of power-law fluid with the inner cylinder executing a planetary motion is 404 by means of experiment of CMC aqueous solution in annulus with the inner cylinder executing a planetary motion.
The Fluid-Solid Coupling Seepage Mathematical Model of Shale Gas
Authors: Shen Wei Jun , Li Xi Zhe , Lu Jia Liang , Liu Xiao Hua
Published: March 2013

In this paper, the stress equation is available by introducing the principle of effective stress in porous media into fluid-solid coupling seepage and considering the conditions of equilibrium. According to the continuity equation of fluid mechanics, considering the interactions between shale gas and rock-soil body, the differential equation of seepage flow is obtained. Through introducing the velocity component of rock particles into the seepage field, the pore fluid pressure in seepage field is introduced into the deformation field, so as to realize the interaction between the fluid-solid coupling seepage. Based on auxiliary boundary conditions in the above equations, the paper establishes the integrated fluid-coupling seepage mathematical model of shale gas, and it will provide the corresponding theoretical and realistic significance in the development of shale gas.
CFD Research and Investigation of 2011 P4/5 Competition Rear Wing
Authors: Pugliese Aldo , Yang Zhi Gang , Li Qi Liang
Published: March 2013

In order to analyze the influence of the rear wing of a competition race car on the aerodynamics of the whole vehicle, computational fluid dynamics simulations have been performed. Rear wing is set by two elements, a main plate and a flap. Their relative position and the angle of attack of these elements influence the aero- performances in terms of downforce and drag generated; 12 different configurations have been generated, modifying the angle of attack and the slot gap. 3D mesh has been generated from the geometrical model of the vehicle, and air flow around the vehicle and on the rear wing has been evaluated through a CFD commercial software. It has been proved that steeper angles of attack of the mainplate and of the flap contribute to generate more downforce until a certain point; when angle of attack reaches a critical value, the downforce no longer increases and the drag still keep high values.
Effect of Latent Heat on Insulation Characteristics in Phase Change Roof
Authors: Gao Meng , Wang Jing , Wu Guo Zhong
Published: March 2013

Under summer climatic features of Daqing area in China, numerical simulation on the unsteady heat transfer characteristic of phase change roof was investigated, considering direct influence of solar radiation. The main influencing factor of latent heat in the phase change roof was analyzed in this paper. The results show that, latent heat in different phase change temperature has little effect on hourly distribution of average temperature and average heat flux of base upper surface. Choosing appropriate phase transition temperature is still the key to take efficient and reasonable adventage of phase change materials in the roof structures.
The Composite Control for Single-Link Flexible Manipulator Using Dynamic Sliding Mode and Optimal Based on Dynamic Switching
Authors: Chu Ming , Deng Xia , Jia Qing Xuan , Huang Fei Jie
Published: March 2013

A composite controller is designed based on the singular perturbation model of single-link flexible manipulators. A dynamic sliding mode controller is designed for the slow subsystem, and optimal controller is designed to stabilize the fast subsystem. Numerical simulation results confirm that the proposed controller not only can perform fast and accurate tracking, but also can reduce the chattering of the sliding-mode control, and the proposed controller can suppress the tip vibration of the flexible manipulator effectively.
Tolerance Ring Design in the Actuator Arm of a Hard Disk Drive Using Finite Element Analysis
Authors: Suthaweesub Somkid , Dheeravongkit Arbtip
Published: March 2013

This paper presents conceptual designs for the tolerance ring in the Hard Disk Drive (HDD) in order to reduce the total deformation of the tolerance ring and decrease the installation force during the assembly process of the actuator arm, while maintaining the natural frequency within the specification range. In this research, finite element analysis was employed to compare and analyze the installation forces, total deformations of the tolerance ring and the natural frequencies of Actuator Pivot Flex Assembly (APFA). Around its cylindrical body, the tolerance ring consists of several waves which provide rigidity for the APFA assembly to resist the axial rocking motion of the actuator arm. The idea is to decrease the contact surface area between the waves and the e-block by smoothing the contact surface of the waves along the installation direction while maintaining sufficient friction to resist the axial rocking motion. The objective of this research was to minimize the total deformation and installation force. The three input variables, i.e. width, length and height of the alternating flat curve design, were analyzed together by using the engineering optimization. The decreasing of the total deformation of the tolerance ring and installation force during APFA assembly would increase the number of cycles of the reworking process which can help increase the productivity and efficiency of HDD manufacturing.
Experimental Results and Model of Stress-Field-Induced Strain in NiMnGa Single Crystal
Authors: Chen Yan , Zhu Yu Ping
Published: March 2013

Ferromagnetic shape memory alloy (FSMA) is a new class of intelligent material, and has attracted the attention of researchers. This paper studied uniaxial compressive experiment along three different directions of single crystal Ni2MnGa. The experiment indicates that single crystal FSMA presents obvious anisotropy. Based on the experimental data, the mechanical constitutive model of single crystal FSMA under stress was established by using the theory of micromechanics and the thermodynamic principle. With the model, the mechanical behaviors of the material obtain a good description. The model provides theoretical evidence for the study on the mechanical behaviors of the material.
Discuss about Linear System Transfer Function and Optical Transfer Function
Authors: Wang Yuan Sheng , Lu Gui Ying , Li Bo
Published: March 2013

Transfer function (TF) for linear time invariant system and optical transfer function (OTF) for linear space shaft invariant system are compared and contrasted. TF is the unilateral Laplace transform of system’s one-dimensional unit impulse response, dimensions of the input and output may be same or different, TF can be used to describe a variety of filter or to express solution of linear differential equations accurately. But OTF is the Fourier transform of system’s two-dimensional impulse response, dimensions of the input and output must be same, OTF can be used only to describe a low-pass filter or to express solution of the linear univariate partial differential equations approximately. Their eigenfunctions are similar complex exponential functions. OTF has stricter requirements and application conditions than TF. It is helpful to the readers’ understanding of TF and OTF.
Study and Design of Double Shear Regional Magnetic Rheometer
Authors: Zheng Yue Kun , Huang Yi Jian
Published: March 2013

A shear magnetic rheometer with a dual MRF shear region has been designed. The effect of magnetic rheometer gap MRF magneto-rheological on the torque measurement has been took full account, so the measurement accuracy improved. The design process using the Equivalent Magnetic Circuit Method to calculate the reluctance of each local area of magnetic rheometer, and use magnetic potential equation calculate the number of coils required for magnetic rheometer. Finally, used ANSYS software simulation analysis of the magnetic field of the magnetic rheometer, proposed fractional differential equations to describe the relationship between the MRF shear stress, shear rate and time, and using nonlinear least-squares method to fit the coefficients of fractional differential equations. The results show that the magnetic field of the two MRF regions is evenly distributed and the difference in the magnetic flux density of the two MRF regions within the ideal range; Coefficients and orders of fractional differential equations affected by the magneto-rheological fluid nature and speed.
Founded and Explore of the Multiple Primary Structure of Force Method
Authors: Song Xiao Zhuang
Published: March 2013

Such as the canonical equation of force method’s free terms and coefficients are different from the primary structures, can obtain by the internal forces of the primary structure. This paper demonstrates the correctness and rationality, as well as the applicable range from theory.And the creation of a new method to solve statically indeterminate structure, said this method is the multiple primary structure of force method.
Mechanical Design for a Power Wheelchair with Self-Actuated Seating Functions Based on Ergonomics
Authors: Wang Fang , Zhang Jian Guo
Published: March 2013

Wheelchairs with posture change functions are required by clinicians to assist activities of daily living for handicapped people. In this paper, the mechanism of a wheelchair with self-actuated seating functions was designed and its degree of freedom was introduced. Link length was determined based on ergonomics and anthropometry to meet national standards. Kinematics simulation was carried out in MATLAB to investigate the working characteristics of the wheelchair and prove the feasibility of the scheme. Humanized design was explored which was based on ergonomics to satisfy the safety, comfort and efficiency.
Simulation Analysis of Stiffness of Automotive Joint
Authors: Liao Jun , Feng Yan
Published: March 2013

In order to evaluate the reliability of vehicle design and vehicle safety performance, analysis software is applied to establish the analysis model of automotive joint stiffness; Body joint stiffness of design vehicles and benchmark vehicles; Reasonable and feasibility of body joint stiffness of design vehicles are verified by comparison.
The Research on the Key Factor Affect the Precision in Stress Analysis for the Rotor of Steam Turbine
Authors: Zhang Chun Lin , Hu Nian Su , Yang Wen , Wang Jian Mei , Li Min , Ma Cheng
Published: March 2013

With the development of the power grid, the proportion of large capacity unit is increasing rapidly. It requires a more in-depth study on the reliability of the unit, especially for the unit adjusting the peak. This paper concerned on the research of the surface heat transfer coefficient, which is the key factor affect the precision in thermal stress analysis. The surface heat transfer coefficient is obtained via the numerical calculation for the steam’s flow state and the transient heat transfer between rotor. This paper mainly describes the steam’s flow state and the transient heat transfer with the steam seal, and the results show that the direct numerical calculation is resultful in this subject.
Based on the Improved Homotopy Perturbation Method for Solving Nonlinear Equations
Authors: He Xi Qin , Li Hai Yang
Published: March 2013

According to Nonlinear Fredholm differential and integral equation，it is proposed that the improved homotopy perturbation method is used to solve in this paper, and apply the numerical examples to compare the advantages among homotopy perturbation method, Adomian decomposition method and improved homotopy perturbation method . The results show that improved homotopy perturbation method is more effective.
Oscillation of Neural Type Nonlinear Impulsive Hyperbolic Equations with Several Delays
Authors: Xiao Li , Yang Ji Chen , Liu Guang Jie , Liu An Ping
Published: March 2013

In this paper, oscillatory properties of solutions for neutral type nonlinear impulsive hyperbolic partial diﬀerential equations with several delays are investigated and a series of suﬃcient conditions for oscillation of the equations are established.
Research of Vibration Control Method on Turbine Bent Rotor
Authors: Guo Yu Jie , Zhang Wen Tao
Published: March 2013

According to bent position and size on two HP-IP bent rotor,and combined with maintenance schedule,this paper puts forward two vibration control methods of low speed dynamic balance on site and high speed dynamic balance after turning.For the bent position in the turbine middle,on the basis of mode decomposition in bent rotor,the research show that balance weight according to a scale in the both ends and middle mainly of the turbine can achieve good results.
Response of Ultra Precision Machine under Micro Environment Vibration
Authors: He Yan Ran , Fan Jin
Published: March 2013

For the study of response of ultra-precision machine under environment vibration and its influences on machining precision, the numerical simulation method is adopted in this paper, the equipment modes are analyzed for the rationality of established model compared to the test results; and the frequency response of the machine excited by the measured ambient vibration acceleration power spectral shows that the table displacement reaches up to 0.396μm, exceeding the value allowed. Therefore, it’s significant to consider the micro environment vibration in ultra-precision processing.
Experimental Research on Hysteretic Behavior of L-Shaped Columns with HRB500 Reinforcement
Authors: Liu Kun , Tian Jing Xian , Li Yan Yan
Published: March 2013

Three L-shaped columns with HRB500 reinforcement were tested under low cyclic loading. The effect of stirrup ratios on damage characteristic, hysteretic characteristic, rigidity degradation and energy dissipation capacity was analyzed to research the hysteretic behavior of L-shaped columns with HRB500 reinforcement. The result shows that the damage characteristic and the hysteretic characteristic of L-shaped columns with HRB500 reinforcement are improved with the increase of stirrup ratios. The energy dissipation capacity of L-shaped column was also enhanced after ultimate load with the increase of stirrup ratios.
Unit Type Curtain Wall Mullions to Strengthen the Design and Structure Calculations
Authors: Zhang Qiao , Liu Yue , Wang Shi Shi
Published: March 2013

During the design process of Unit type curtain wall, there are lots of problems which are worthy of exploring and need to be addressed. Through the International Plaza curtain wall engineering, the methodology of design is that forming a cross-section of steel and aluminum combination by inserting steel ferrule in to unit male frame and the female frame; meanwhile, by using a reasonable design to the shape and size, we can meet the requirement of the overall strength and stiffness of the unit mullion. Mechanical model, actual design of the project parameters and drawing conditions, which detail the design process and calculation results, are reasonable enough for curtain walls researchers and designers.
Study on the Key Technology of Intelligent Transformer
Authors: Wang Fa Ming , Sun Hao , Hu Yuan Chao , Xie Qi Jia , Dai Wen
Published: March 2013

The development of smart grid puts higher requirement on the intelligentization of high-voltage equipment including transformers. At present, the intelligentization of transformers is mainly realized through intelligent components. The combination of intelligent components and transformer can realize the measurement, control, calculation, inspection and protection of the transformer. This paper detailedly described the hardware design framework and software function modules of transformer intelligent components, as well as the expert diagnosis system applied to transformer intelligent components. The intelligent components designed by this paper have been successfully applied to 220kV intelligent substation, which is operating stably and reliably. This can promote the development of intelligentized primary power equipment and smart grid as well.
Design of a Direct TPMS System Based on SP37
Authors: Hou Dong Dong , Hu Dai Rong , Liu Yuan Yang , Li Ming Qiang
Published: March 2013

This paper introduces the TPMS installation method and system composition, and on this foundation, a kind of scheme of the TPMS emitter based on the SP37 chip is proposed. Monitor use the microprocessor and TDA5230 chip to realize the wireless data receiving, and this paper details the key technology in the hardware and software design. The actual test results show that, sensitivity of the wireless data receiving of the system not less than -105dBm, and the system works stability when speed of car is 80 ~100 km/h.
A Real Implementation of Dangerous Objects Capturing in Surveillance Web
Authors: Cheng Yun , Lang Hai Tao , Yao Peng , Guo Rui , Hu Jian Ying , Wang Jie
Published: March 2013

The main focus of our research is capturing dangerous objects when they appear under the surveillance camera again, while have performed a dangerous activities in other places. Our solution is a two-phase method, including object learning and capturing under the classification framework. The samples of objects and non-objects are collected to train a classifier with libSVM in object learning phase. In object capturing phase, all moving objects are detected by background subtraction, then are classified into dangerous or non-dangerous. To obtain a robust objects representation to illumination, scale, rotation etc. we fuse HSV space based color feature and multiple scale texture feature. The experimental results with real surveillance data validated the proposed method.
Simulation of Four-Stage Doherty Power Amplifier Structure
Authors: Chen Jun , Yang Hua Wei , Su Kai Xiong
Published: March 2013

In order to improve the efficiency of Digital TV transmitter, we uses a new type of four-stage Doherty structure. Based on the transmission line theory and active loadpull theory, we deduce the principle of the four-stage Doherty structure, and use ADS to design a four-stage Doherty power amplifier. The simulation result shows that this four-stage Doherty PA has an efficiency of 34% at 6dB back-off (53dBm) for DVB-T OFDM 64 QAM modulated signal. The ACPR and MER obtained at 53dBm when output power are 31dBc and 28dB respectively.
Application of Computational Fluid Dynamics (CFD) Used in Simulation of Flow Distribution for Air Condition
Authors: Zhang Zheng , Wang Jin Feng , Xie Jing , Tang Yi
Published: March 2013

In this article, the application of Computational Fluid Dynamics (CFD) technology in the field of Heating Ventilation & Air Condition was introduced, and the research progress in optimizing the simulation of air-conditioned room was summarized. Some domestic and foreign studies on air conditioning operation and energy saving were illustrated about the effects of different installation locations, blow angles and air supply modes, which would provide a theoretical basis and scientific guidance for air-conditioning systems to optimize the design. Based on previous results, the development of further research on CFD in the simulation of air-conditioning in future was analyzed.
Eliminating Cold-Start Problem of Music Recommendation through SOM Based Sampling
Authors: Liu Ning Han , Chiang Cheng Yu , Hsu Hsiang Ming
Published: March 2013

Recommendation systems have a prevalent cold-start problem. The problem is occurred might due to new users or new items (music) are added into the system. In this paper, the meaning of the cold-start is narrowed to that the systems do not understand the new user’s preferences. Therefore, systems can not recommend the music to users. Although many recommendation systems have a solution to reduce the cold-start, e.g., general systems utilize random to select songs. The systems random select some music works to user so that systems will know the user’s preferences after they rated the music works. However, systems may cost much time to collect the necessary information when the new user is interesting in some special types of music. Therefore, if systems select various type of music initially, the user’s preferences will be extracted more quickly. That is the cold-start problem can be reduced when the types of initial recommended music are various. In our approach, we utilize SOM to select some music from clusters. According to experiment, SOM selects type of music more average than k-means and random selection. Therefore, SOM can improve the cold-start problem and increase the precision of recommendation results.
Research of Enhanced Speech Signal Based on MATLAB Simulation Platform
Authors: You Yi Long , Zhang Fei , Zuo Bu Lei , You Feng Xiang
Published: March 2013

Although traditional algorithms can led to suppressed voice in the noise, but the distortion of the voice is inevitable. An introduction is made as to the speech signal enhancement with an improved threshold method. Compared MATLAB experimental simulation on simulated platform with traditional enhanced algorithm, this paper aims to verify this method can effectively remove the noise in the signal, enhanced voice quality, improve speech intelligibility, and achieve the effect of the enhanced speech signal.
The Design of Image Acquisition System Based on Contex-M3
Authors: Zhang Fan , Mao Jian Dong , Rao Zhi Min , Zhang Ya Ya
Published: March 2013

A CMOS image acquisition system based on Contex-M3 is developed. In design STM32F103X is selected as the main controller, OV7670 is used for image sensors. In order to capture high-speed digital image, the FIFO buffer chip AL422B and SD Card under the control of the DMA are employed to directly transfer data. Moreover the SD card and 2.8 inch TFT LCD are selected to storage and display image data, respectively. Because of small size, low power, simple structure and low cost, the image acquisition system can provide an important reference value for development of similar system.
The Research and Analysis of Windows Network Data Acquisition Technology
Authors: Wang Wei Feng , Bi Xue Jun , Liu Hai Yan , Yang Zhao Hong
Published: March 2013

Windows network packets capture technology is closely related with Windows network protocol architecture. Paper first introduces the Windows network protocol implementation, then analyze the network packets capture technology in the user mode and kernel mode, moreover discuss the data capture technology at the application layer, including API interception technology, dynamic library replacement technology and database trigger technology, finally, the various network data acquisition technology are analyzed, and what kind of data acquisition technology is used depends on the purpose of data capture and the characteristics of the target information system.
A FPGA-Based Discretization Algorithm of Continuous Attributes in Rough Set
Authors: Sun Guo Qiang , Wang Hong Li , Lu Jing Hui , He Xing
Published: March 2013

Rough set theory is mainly used for analysing, processing fuzzy and uncertain information and knowledge, but most of data that we usually gain are continuous data, rough set theory can pretreat these data and can gain satisfied discretization results. So, discretization of continuous attributes is an important part of rough set theory. Field Programmable Gate Array(FPGA) has been became the mainly platforms that realized design of digital system. In order to improve processing speed of discretization, this paper proposed a FPGA-based discretization algorithm of continuous attributes in rough ret that make use of the speed advantage of FPGA and combined attributes dependency degree. This method could save much time of pretreatment in rough ret and improve operation efficiency.
Decentralized Data Fusion Algorithm Using Factor Analysis Model
Authors: Quadri Sayed Abulhasan , Sidek Othman
Published: March 2013

Multi-sensor data fusion provides significant advantages over single source data to achieve an improved accuracy and better precision. Decentralized data fusion approach is one in which features are extracted and processed individually and finally fused to obtain global estimates. The paper presents decentralized data fusion algorithm using factor analysis model. Factor analysis is a statistical method used to study the effect and interdependence of various factors within a system. The proposed algorithm fuses accelerometer and gyroscope data in an inertial measurement unit (IMU). Simulations are carried out on Matlab platform to illustrate the algorithm.
Research on Importance of Texture Information in Face Recognition
Authors: Jin Yong Gao , Xu Cheng Zhe
Published: March 2013

This paper presents importance of skin texture information in face recognition. To this end, we perform the illumination normalization on face image in order to extract texture information unaffected by illumination variation. And then apply mask image on each illumination normalized face image to obtain the corresponding texture data, which hardly contain the shape information. Face recognition experiments are carried out by using texture data. Experimental results on Yale face database B and CMU PIE database show that the texture information has considerable ability to distinguish subjects in face recognition.
Applying More Initial Groups to the Semi-Supervised Clustering Based on one-Class Support Vector Machines
Authors: Gu Lei
Published: March 2013

The traditional semi-supervised clustering based on one-class support vector machines used some labeled data called seeds for the clustering initialization. These seeds were partitioned into several initial groups according to their labels and the number of initial groups was equal to the number of clusters. However, the traditional semi-supervised clustering based on one-class support vector machines is sensitive to the initial groups and often obtained the local optimal solutions. In this paper, more initial groups produced by seeds are applied to the traditional semi-supervised clustering based on one-class support vector machines to get more local optimal solutions and the proposed algorithm can combine multiple local optimal solutions to obtain the better clustering performance at last. To investigate the effectiveness of our approach, experiments are done on two real datasets. Experimental results show that the presented method can improve the clustering accuracies compared to the traditional algorithm.
Personal Identification by Fusing Hand Shape Geometry and Palmprint Features
Authors: Xu Shuang , Li Min , Ding Ji Feng , Cui Yan Qiu
Published: March 2013

This paper presents a new personal identification approach with fusion of hand shape geometry and palmprint features based on Gabor wavelet transformation. Two kinds personal features can be extracted form the low-resolution hand images. Hand shape geometry features include length of four fingers and width of palm. The palmprint features are composed of principal lines, wrinkles, minutiae, delta points. In pattern matching, the normalization method of matching degree is proposed. At the same time square difference distance is used to calculate feature matching degree of the hand shape geometry and palmprint. The result of experiment show that this approach is the most suitable, acceptable and the higher recognition rate, respectively, using different feature extraction methods.
Research of the Terminal Timer System Based on High-Speed Color Linear CCD
Authors: Xu Feng , Liu Zhi Yu
Published: March 2013

In competitive sporting events, the scores confirm replied on manual timing can’t satisfy the requirements, according to the provisions of the IAAF, the major sports event will require the use of electric timing system. At present, the development level of the photo finish collecting still stay in the black-and-white image level, high-speed color linear CCD array technology used in track events final electrical-timing system, carried out in-depth analysis of the various factors that affect image quality of the post-processing, described in digital image processing with gray technology , color balance, histogram equalization and digital image processing techniques so as to get clear, high quality color image data.
Feasibility Analysis on High Voltage Ride-through of Wind Turbines
Authors: Song Fei , Wang Tong , Tang Kan , Zhu Dan
Published: March 2013

With the rapid increase of wind farms, a set of specific requirements have been established or are developing. The objective of these grid guidelines is to ensure wind farms not adversely affecting the power system. The control strategies and theories on low voltage ride through (LVRT) have been focused on for a long time, how to deal with the gird high voltage is seldom discussed. This paper introduces the main types of wind turbines, discusses the major grid requirements of high voltage ride through (HVRT). The capability of HVRT for current wind farms is introduced. The technology and its implementation of the HVRT of wind turbines are focused on. The technical feasibility to increase the capacity of HVRT for wind turbines and the cost are analyzed in detail. Finally a conclusion is achieved, that is installing DC chopper can help converters to realize HVRT.
Soft Sensing Based on Kernel Isomap
Authors: Wang Qiang , Tian Xue Min
Published: March 2013

A novel method of soft sensing is propsed combined Kernel Isomap (KIsomap) with Least squares support vector machines (LS-SVM). KIsomap is an improved Isomap and has a generalization property by utilizing kernel trick. It is a kind of novelly promoted nonlinear methods for dimension reduction, and can effectively find out the intrinsic low dimensional structure from high dimensional data. The KIsomap is used to feature extraction and reduce dimensions of sample. The LSSVM is applied to proceed regression modelling, which can not only reduce the complexity of modeling but also improve the generalization ability.The proposed method is used to build soft sensing of diesel oil solidifying point. Compared with other two models, the result shows that KIsomap-LSSVM approach is effective and correct.
A New Criterion for the Global Exponential Stability of Neural Networks with Time Delays
Authors: Mao Kai , Shi Bao
Published: March 2013

In this paper, we study the neural networks with time delays. By using of the Homeomorphism theory and employing an inequality, constructing a new Lyapunov-Krasovskill functional, we give a new sufficient condition, which is independent of the delays, guarantying the existence, uniqueness of the equilibrium point and it’s global exponential stable. Meanwhile, the incorrectness of calculation in the previous Refs is pointed out. We therefore improve the previous results.
A Combination Approach to Noise Reduction in Digital Image Processing
Authors: Dong Jing , Chai Zhi , Xia Ke Wen
Published: March 2013

In order to reduce Gaussian and Salt & Pepper noises, a combination approach to noise reduction is presented by combining the median filter with the mean filter. The detail simulations show that the mode which the median filtering first and then the mean filtering is superior to that of the simply single filtering, or the mean filtering first and then the median filtering when the image obviously contain the Salt & Pepper noise. On the other hand, it is not necessarily the optimal scheme to use the mode which the mean filtering first and then the median filtering when the digital image obviously contains the Gaussian noise.