bluuebunny/crossref_metadata_2025 huggingface dataset:
The Influence of Power Line Transient Pulse Interference to Airborne Equipment
Authors: Jiang Yi Lin , Chen Hui , Zhang Jian Feng , Guo Gang , Sun Guo Qiang
Published: April 2014

With increasing complex degree of airborne equipment, electromagnetic environment inside the aircraft becomes deteriorative continuously. During the inductive load on-off, transient interference will be produced in power line. Owing to crosstalk of cables, transient interference will diffuse to interface of all equipments, which will hazard the airborne equipment greatly. This paper analyzes the reason and potential harm produced by transient interference in power line of airborne equipment, and proposes measures to resolve the influence of interference.
The Research on the Ashtray Designed with UG NX and Manufactured Basing on Rapid Prototyping Manufacturing
Authors: Wu Wen Jin , Xu Zhong Yun
Published: April 2014

3Dprinter is a popular topic today, Designers, engineers and educators-thousandsof professionals rely on 3D printer to test and perfect their work with 3Dmodeling. This paper described the mature rapid prototyping manufacturing in present-day, design of ashtray model based on UGNX, describedthe whole process of using the CatalystEX to automatic slice,how does ashtray model print using the uPrint 3D printer.
The Study on Farm Vehicle Electric Window Controller with Anti-Pinch Function
Authors: Chen Zhong You , Song Gui Cui , Li Qiang
Published: April 2014

The study on farm vehicle electric window controller is studied in this work. Considering the characteristic and the demand of farm vehicle window lifter, it has been designed the control system of cross arm lifter. The system can realize the motors over-current, over-voltage and overheat protection. By monitoring the current, it can identify the situation of the lifter glass way up coming cross obstacles and realize anti-pinch function automatically. Through the actual production testing, the system performance is proved to be stable and reliable, and it has a certain popularization and application value in future.
The Study on Medium Filling Scheme of LNG Tank Container Impact Testing Based on ANSYS
Authors: Cao Jing , Han Mei , Qi Jing Yu
Published: April 2014

Proposal the medium filling scheme of LNG tank container impact testing that filling the tank with water which mass is equal to dangerous goods, since the medium filling scheme before is difficult and loss, by finite element calculation with ANSY to the stress of LNG tank framework in the actual conditions and test conditions. Studies show that the two conditions of the tank is similar, test conditions can simulate the actual filling conditions. Applying this conclusion to the impact test, which can greatly simplify the test procedure and reduce the difficulty of the test, the test can be enhanced operability and economy.
Turning-Milling Machining Center of Each Axis Movement Principle and the Headstock Structure Analysis
Authors: Sang Lu Ping
Published: April 2014

Turning milling machining center are analyzed the structure and working principle of headstock of numerical control machine tool headstock consists of motor, drive system and components of the head of a bed, is mainly used to achieve the main movement of the machine tool. Spindle structure adopts precision double row cylindrical roller bearing and two-way thrust angular contact ball bearing group and type. The machine is the best combination of lathe and milling machine. Configuration French NUM1060 system, realize five axis control, a loading card can complete a variety of difficult machining of complex.
Design of a New Beetle's Electric-Control Trunk Device
Authors: Jing Tao , Wang Han Bin
Published: April 2014

This present paper deals with transform and design of electric-control trunk device for new Beetle. The path generation method is used to synthesis a new linkage mechanism. And the dimensions of this mechanism are optimized by genetic algorithm. Subsequently PWM modulation method is implemented in the microcontroller for inverter and electric control, which responses to the trunk opening, closing and reacting to interference.
Limit Cycle Flutter Analysis of a High-Aspect-Ratio Wing with an External Store
Authors: Xu Jun , Ma Xiao Ping
Published: April 2014

Limit cycle flutter analysis of a high-aspect-ratiowing with an external store is presented. The concentrated store mass iscombined into the governing equations which are obtained using the extendedHamilton’s principle. The high-aspect-ratio wing structural model, which alsoconsiders the in-plane bending motion, is used. Three possible nonlinearitiesare considered including structural nonlinearities, aerodynamic nonlinearities,and store nonlinearities. Time simulation and bifurcation diagrams areperformed to analysis systems with three nonlinearities.
Mode Analysis and Study of Sunjiagou Aqueduct
Authors: Chen Cai Ying , Wei Ke Lun , Zhu Ya Fei
Published: April 2014

This paper mainly adopts the finite element analysis software ANSYS to calculate and analyze the dynamic characteristic of aqueduct structure,using added mass method to deal with interaction between water and aqueduct wall, and get the natural vibration frequency and main vibration mode of U-shaped aqueduct in different water depth. The calculation result shows that water has a small effect on the vibration mode of aqueduct structure, but has a greater influence on the natural vibration frequency of aqueduct structure; natural vibration frequency of aqueduct structure decreases with the depth deepening. The research results provide the basis for the seismic design and protection of Sunjiagou aqueduct.
Study of Frequency Converter Motor Selection Method of Shafting Test Bed
Authors: Liang Xing Xin , Liu Zheng Lin , Liu Jiao
Published: April 2014

The rotary inertia, speed, acceleration of shafting and the friction coefficient of rubber bearings have an important influence on the calculation of shafting resistance moment, related to the selection rationality of driving motor. In order to guarantee load startup and normal operation of the shafting, by analysing shafting rotary inertia, bearing support force and friction coefficient, calculated resistance moment of the shafting, established the mathematical model of shafting equivalent resistance moment and motor rotational speed, compared the output moment of motor with shafting equivalent resistance moment, so that determined the correct motor model.
The Study on Peak Throughput of TD-LTE
Authors: Zhang Jun Xia
Published: April 2014

Based on the analysis of the physical channel and frame structure of TD-LTE system, considering the influence of control channel overhead and uplink-downlink configuration, two estimating methods of the TD-LTE peak throughput are analyzed, which have positive preference value for network planning.
Vehicle to Grid - Status and Issues, a Preliminary Survey
Authors: Li Chun Xiao , He Da Wei , Sun Mei , Cai Jun , Chen Wan Pei , Du Yu Ren , Hu Xue Long
Published: April 2014

Recently, with the development of industrial technology, as well as the economic and environmental incentives, the Vehicle to Grid (V2G) technology was born for solving economic and environmental issues. Currently, the V2G is an active research topic among academic, governments and vehicle manufactures. Considering the great potential benefits of V2G, this paper try to give a preliminary survey on the V2G technology, and help them finding related remaining research issues.
Application of Linearly Polarized Light in Automobile Lighting System
Authors: Fu Xiao Jun , Cheng Di
Published: April 2014

When driving at night, the driver may be troubled by the intense light shined by the vehicles coming from the opposite direction. The automobile lighting system and the windshield with polarizers have been designed to solve this problem in this paper, thus replacing the traditional non-polarized illuminating light with linearly polarized light. The experiment reveals that, for a wide range of tilt angles of the windshield, the intensity of light emitted by other automobiles that a driver can receive will be reduced by 40%--64%, while the driving visibility is little affected. Therefore, it can be concluded that the new system can effectively increase the safety factor of night driving.
Dyeing Properties of Gardenia Yellow for Silk Fabrics
Authors: Zhang Jun
Published: April 2014

Gardeniayellow was applied to dye silk by mordant and direct dyeing methods. The post-mordanting dyeing exhibited the highest color depth. The effects of the categories and dosages of mordant, and the temperature, pH and time of mordanting on the color depth of the dyed silk were discussed in the post-mordanting process. Results showed that the satisfactory color depth was achieved when zinc sulfate was used as a mordant. Additionally, a low dosage of mordant, low mordanting temperature and a weakly acid medium were found to give good dyeing effects.
Dyeing Properties of Warm-Dyeing Reactive Dyes for Viscose/Chitin Blend Fiber
Authors: Zeng Hong Xian , Li Min Zhong , Tang Ren Cheng
Published: April 2014

In this work, the dyeing properties of three warm-dyeing reactive dyes (C.I. Reactive Orange 16, Red 198 and Blue 222) for functional viscose/chitin blend fiber containing partially deacetylated chitin were investigated. Under all the dyeing conditions, reactive dyes exhibited higher exhaustion and fixation on viscose/chitin fiber than on conventional viscose fiber. The difference of dye exhaustion and fixation between viscose/chitin and viscose fibers became greater in the following cases: low to moderate dye concentration, low dyeing temperature, no alkali, the use of the dyes with low molecular weight, etc. The dependence of the exhaustion and fixation of reactive dyes on temperature on viscose/chitin fiber was less than that on viscose fiber. The reactive dyeing of viscose/chitin fiber required only a low dosage of sodium carbonate.
Research on Electromagnetic Interference of Wiring Motor Vehicle in Coal Mine Tunnel
Authors: Zhang Hong Wei
Published: April 2014

Contact net of motor vehicle in coal mine tunnel is a powerful industrial disturbance source, pulse interference generated by contact net is some pulse group with random, repetitive amplitude and duration. When the train is in the rated working current situation, the pantograph and overhead line is in the process of separation to contact, the motor vehicle running speed is lower, the discharge current is larger, the more arc radiation interference.
Effects of the Processing Parameters on Porosity of Selective Laser Sintered Aliphatic Polycarbonate
Authors: Song Xiao Hui , Shi Yu Sheng , Song Ping Hui , Wei Qing Song , Li Wei
Published: April 2014

Selective Laser Sintering (SLS) has been successfully and broadly applied in biomedical engineering to fabricated biomedical part. And the porosity and microstructure of part can be controlled by main sintered parameters. This research focused aliphatic Polycarbonate (PC) sintered with SLS. According to the orthogonal experiment, the effect of laser power energy and interaction between main sintered parameters on porosity has been studied. Then the micro structure and mechanical properties of specimens sintered with the best optimal parameters have been analyzed.
Five-Axis Machining Method of Complicated Curved Surface
Authors: Huang Qi Hong
Published: April 2014

Five-axis CNC machine tools are constituted by three-axis machine tools and two rotational degrees of freedom. Using the two rotary axes, five-axis CNC machine tools can improve the accessibility and become an important means of machining complex surface parts. In order to get high tapered complicated curved surface parts, a dual turntable five-axis machine with A-C tables was introduced and the mathematical models of the CNC processing of the workpiece were established. Through machining experiment of the several major processed forms, it shows that the dual turntable five-axis machine system has high machining quality and could be used to machine the difficult-to-cut materials, spatial complicated curved surface parts and special requirements.
High-Speed Cutting Machining Simulation of Aero Engine Casing Hole
Authors: Dong Ting Jian , Chen Jin , Ding Hua Peng
Published: April 2014

For the high-speed machining aero engine casing hole, according to the principle of metal forming and the characteristic of metal cutting plane strain, with selecting some key physical factors of the cutter - chip contact friction and abrasion model, the Cartesian orthogonal cutting model of aero engine casing hole was established by using the Deform, a sort of finite element analysis software. With taking cutting temperature for preferred aim of the cutting parameters, select the appropriate cutting parameters, the aim of aero-engine casing high-speed (cutting speed up to 700m/min) cutting has been achieved by simulation, and the feasibility of the cutting process was researched and confirmed in theoretically by analyzing the cutting force, cutting temperature and tool wear condition.
Impact of Laser Parameters on the Contrasts of Laser Direct Marked Data Matrix Symbols on Titanium Alloy Substrates
Authors: Li Chun Ling
Published: April 2014

To determine the impact of laser parameters on the contrasts of laser direct marked Data Matrix symbols on titanium alloys, a Q-switched Nd:YAG laser was used in the marking process. For this purpose, four laser marking parameters (i.e. electric current, effective vector step, Q-switch frequency, and laser line spacing) were correlated with the symbol contrast (SC). The L25 orthogonal array based on the Taguchi experimental method was adopted to determine the optimal combination levels of laser parameters for the SC, and the experimental data were statistically analyzed by multi-factor analysis of variance (ANOVA). Experimental results showed that the electric current, effectie vector step, laser line spacing have a statistically significant impact on the contrasts of laser marked Data Matrix symbols. Q-switch frequency is statistically insignificant at a 5% level. The optimal combination levels of laser parameters for the SC is where the electric current is at 26A, the effective vector step is at 0.001mm, the laser line spacing is at 0.01mm, and Q-switch frequency is at 5kHz.
Interface Diffusion of Composite Rolling AZ31 Magnesium Alloy Sheet Clad by Al Foil during Annealing
Authors: Su Guan Qiao , Wang Zhong Jun , Zhu Jing
Published: April 2014

The main disadvantage of AZ31 magnesium alloy sheets is low corrosion resistance, which can be improved by coating aluminum layer. In this paper, Al/AZ31/Al laminated composites were produced and interface diffusion behavior of Al/AZ31 by hot rolling and annealing was studied. The results show that the optimally rolling temperature is 400 oC, the thickness of the reaction layer for Mg and Al was increased with increasing annealing time at the temperature of 250 oC and 300 oC, respectively. At the mean time, the diffusion kinetic equation of Al/AZ31 interface was given.
OFAT Experimental Study of Laser Direct-Part Marking of Data Matrix Symbols on Titanium Alloys
Authors: Li Chun Ling
Published: April 2014

To identify critical laser marking parameters which have a statistically significant effect on the contrasts of laser marked Data Matrix symbols on titanium alloy substrates, a Q-switched Nd:YAG laser was used in the laser marking process. The influence of six laser marking parameters (i.e. electric current, effective vector step, delay between the effective vector step, Q-switch frequency, Q release time, and laser line spacing) on the contrasts of laser marked Data Matrix symbols were studied. Single-factor analysis of variance(ANOVA) tests with a 95% confidence level were employed to determine whether a laser parameter had a statistically significant impact on the contrasts of laser marked Data Matrix symbols. Experimental results showed that four laser marking parameters (i.e. electric current, effective vector step, Q-switch frequency, and laser line spacing) have a statistically significant effect on the contrasts of laser marked Data Matrix symbols.
Verification of the Applicability of Seismic Safety Evaluation Program LSSRLI-1 in Medium Soft Soil Using Exact Solution
Authors: Li Rui Shan , Yuan Xiao Ming
Published: April 2014

The equivalent linearization program LSSRLI-1, proposed by Xiaojun Li in 1989, is the important content in seismic zoning work and seismic safety evaluation of engineering sites. It is necessary to check the applicability of LSSRLI-1 to all kinds of sites. The mainly elaboration of the paper is using exact solution to verify the applicability of seismic safety evaluation program LSSRLI-1 for medium soft soil. Previous research has already demonstrated that the shear strain in stiff and half-stiff sites calculated by LSSRLI-1 and the exact solution are about the same, have an almost identical shape. The distribution of shearing strain in different depths calculated by the two methods has the same set of characters, and the difference between the two methods is small, if any, can be ignored in an acceptable range. In this paper, however, the results calculated for the discrepancy of shear strain between LSSRLI-1 and exact solution in medium soft soil has a very significant impact on the surface response spectrum, leading to prominent diversity to the response spectrum.
Solving Measures and Application of Super-Long Structure under Temperature Problem
Authors: Wang Yong Sheng , Wu Li Hua , Xie Zong Hai
Published: April 2014

Due to the long structure plane size of the super-long concrete structure ,considering the effect of environment temperature on the structure in design. the expansion joint is arranged to solve the problem of temperature stress and shrinkage stress in the past.This paper discusses several new solutions on the temperature problems of super-long structure,and the unbonded prestressed technology in the engineering application of super-long structure under temperature effect to solve problems to do the analysis,provides the design basis for engineering designers to consider the temperature effect.
The Characteristics of Trivariate Vector-Valued Super-Wave Wraps and Applications in Materials Engineering
Authors: Huang Yong Yi
Published: April 2014

The rise of wavelet analysis in applied mathematics is due to its applications and the flex- ibility. We introduce vector-valued wave wraps with multi-scale dilation factor for space , which is the generalization of univariate wavelet packets. A method for constructing a sort of orthogo-nal vector-valued wavelet wraps in three-dimensional space is presented and their orthogonality traits are characterized by virtue of iteration method and time-frequency analysis method. The orthog-onality formulas concerning these wave packets are established. Moreover, it is shown how to obtain new Riesz bases of space from these wave wraps. The notion of multiple pseudo fames for subspaces with integer translation is proposed. The construction of a generalized multiresolution structure of Paley-Wiener subspaces of is investigated. The pyramid decomposition scheme is derived based on a generalized multiresolution structure.
Thermal Stress Analysis of the Die during High Pressure Casting
Authors: Hu Wu , Kang Ming Long , Zeng Jian Min
Published: April 2014

The distribution of temperatures and stresses in the die during high pressure die casting are computed through commercially finite element software developed by Wincast team, Germany. The deformation of the die during its continual running is predicted under the conditions without and with air cooling. The simulated results show that the regions of die, which contact with the casting, is subjected to compressed stresses and the other regions of the die subjected to tensile stresses. Compressed stresses are changed steeply from tensile to compress on the boundary between the casting and the inner cavity walls, which will results in hot-fatigue in those regions of the die. Setting cooling channel within the die is an efficient measure for eliminating hot-fatigue and prolonging life of the die.
Droplet Transfer Analysis of Intermittent Pulsed Arc Welding Used to Repair the Metal Defects
Authors: Yang Jun Wei , Teng Jia Xu , Zhang Xiao Hui
Published: April 2014

Intermittent pulsed arc welding using micro heat control, it can be used to repair the defect of metal parts. But the droplet transfer mode is different from the general pulsed TIG. The image signals of intermittent pulsed droplet transfer are acquired using speed camera systems. Then, the characteristics of droplet transfer for intermittent pulsed arc welding were discussed. The results showed that in the Intermittent pulsed arc welding repair process, welding wire and substrate surface were melted by instantaneous high voltage arc and formed drop wise droplet. And with gravity and surface tension the droplet jitter, roll, and then cooled and solidified rapidly. The change of microstructure is continuous from the substrate to the droplet, showing a good metallurgical bonding.
Coal Reservoir Property Differences Analysis of Different Macrolithotype in Liulin Mining Area
Authors: Li Ling , Tang Da Zhen , Xu Hao , Chen Yao , Yu Ting Xu
Published: April 2014

This paper focused on the influences of different coal macrolithotypes on the coal reservoir properties, using a variety of testing methods studied the connection between macro-lithotype of coal and properties. When coal lithotypes changing from dull coal, bright coal, semibright coal to semidull coal, the adsorption pores change from enclosed types to open, adsorption capacities improved in turn, which is favorable to adsorption, desorption and diffusion of coalbed methane. Seepage pores of bright coal are the most developed, semidull coal and semibright coal less, dull coal the least. The permeability of coal has a positive correlation between microfissure density and large pore content. Different macrolithotype of the same coal seam changes with the permeability could be divided into three stages, including fractures decrease rapidly stage, fractures decrease slowly stage and fractures tend to be closed stage.
Organic Intercalation of Kaolinite in Coal Bearing Strata
Authors: Ding Shu Li , Xu Bo Hui , Sun Yu Zhuang , Chen Xiao Ran , Hou Dan Dan
Published: April 2014

With XRD and IR, the authors conducted studies on the intercalation of acrylamide and salts of fatty acids in kaolinite of coal-bearing strata and its stability. The acrylamaide and the salts of fatty acids were successfully intercalated into kaolinite by virtue of polar organic complexes, which acted the part of entrainer. The basic spacing changed from origin value of 0.718nm to 1.122nm and 1.132nm respectively after the intercalation was perfectly accomplished in kaolinite. The phenomenon that organic complexes are intercalated into kaolinite and form a stable interlayer is probably related to the formation of hydrogen bonds between the inner-surface hydroxyls and the intercalated molecules.
3D Microfacies Modeling of Tight Gas Reservoir: A Case from Changling Block, Jilin Oilfield
Authors: Zhang Guo Yi , Li Xue , Yu Xiao Yu , Li Xiao Song
Published: April 2014

Reservoir geological model is actually used to characterize the reservoir structure and the spatial distribution of reservoir parameters and variations, thus, the prediction of reservoir parameters between wells is the core of geological modeling. In order to improve the accuracy of geological modeling, traditional cycle correlation and sequence stratigraphy method are combined to classfy the sub zones into single sand sections according to the sedimentary characteristics of Changling gas field. The study area has experienced many years of development. On one hand, researchers has a certain understanding of its underground geological characteristics. On the other hand, the well pattern is almost perfect, only the edge of study area needs a certain prediction. Therefore, deterministic and stochastic modeling methods are combined in microfacies modeling and a 3D regional microfacies model of Changling gas field is established finally.
The Remaining Oil Distribution and Main Controlling Factor Analysis of Inefficient Reserves in Complex Fault Block
Authors: Ding Yu Sheng , Chen Shuang Yan , Xie Jun , Zhou Ju Biao , Li Li Yao
Published: April 2014

Inefficient reserves in fault block belongs to low permeability thin interbed, thus water flooding development process has exposed many contradictions which are serious heterogeneity, large difference of suction of interlayer. Entering the water injection development, the injected water which rapidly advance along the high permeability channel causes water channeling and water flooding, which intenses development contradictions between layers. The reservoir numerical simulation technology on computer can reappear the movement of water and gas in the underground reservoir development process and describes the underground remaining oil distribution of inefficient reserves in complex fault block, which summarizes the remaining oil distribution rule of the water flooding development for complex fault block of inefficient reserves and provides basis for the establishment of oil field development adjustment scheme.
Design Printable Pressure Sensor Based on 3DP Fabrication
Authors: Li Na , Yang Ji Quan , Zhou Hou Yuan
Published: April 2014

In this paper, a low cost, printable pressure sensor is presented. The pressure sensor will be used in personal navigation system which was designed based on micro jet fabrication structure. Inkjet printing and line patterning methods have been used to fabricate polymer resistors and field effect transistors on flexible substrates. A prototype sensor was designed, and the models of mechnical structure and ditital fabrication was also given, fabricated and tested with standard experimental measurements. Results verify that the pressure sensitivity can be measured for both requency and minimum power level difference in good perforamance. The dynamic performance of pressure sensor was also tested by inkjet printing on to flexible substrates including paper, with high resolution in just seconds.
Dynamic Response Analysis of Composite Soil Nailed Wall under Earthquake
Authors: Wang Xue Lang
Published: April 2014

In this paper, with the help of the finite element software ADINA, an actual composite soil nailed wall was solved. The dynamic response of the composite soil nailed wall is analyzed and discussed under the EL-Centro and man-made Lanzhou accelerogram. And the variation principles of the soil nailed wall which subjected to the earthquake, and the earthquake coupled with pore pressure, are demonstrated respectively. The results of the FEM dynamic analysis can be a useful reference for engineers of the design and construction of the composite soil nailed wall.
Pattern Recognition Controller Based on Fuzzy Neural Network
Authors: Cheng Liang
Published: April 2014

A class of fuzzy neural network design problem H controller. By TS fuzzy theory, a model of nonlinear complex systems. Then, based on Lyapunov-Krasovskii functional and LMI technique, gives the design an H controller. By using the Matlab LMI toolbox, we can get the corresponding feasible solution of linear matrix inequalities. Finally, a numerical simulation examples are given to prove the correctness of the H controller.
PSPICE Simulation of IGCT and its Inverter Circuit
Authors: Kong Long Guang , Zhou Yong
Published: April 2014

In order to observe the state of Integrated Gate Commutated Thyristor(IGCT) in inverter circuit and analyze the reason of its breakdown, a single 2T-3R subcircuit model of IGCT is used in Personal Simulation Program with IC Emphasis(PSPICE) environment to simulate an IGCT inverter unit of a 6kV/2MVA frequency converter. Simulation results show that when the stray inductance in inverter circuit is large, high forward blocking peak voltage will cause the breakdown of IGCT. This problem is solved by installing an absorption capacitor.
Research on the Solid Thin Film Lithium-Ion Battery Integrated on-Chip
Authors: He Yong Tai , Xiao Li Xian , Peng Yue Hong , Liu Jin Hao
Published: April 2014

the solid thin film lithium-ion battery integrated on chip was designed and analyzed based on solid lithium-ion battery structure, materials and microelectronics processing technology. The design model of the solid lithium-ion battery consists of Li negative electrode, Li3PO4 electrolyte and LiCoO2 positive electrode. The preparation process of the solid lithium-ion battery integrated on chip was researched, and the process consists of seven main steps. In addition, the characteristics of the design model of the solid lithium-ion battery were analyzed using COMSOL. The results show that the solid lithium-ion battery has small internal resistance and large discharge capacity. The discharge capacity of the solid lithium-ion battery under the discharge current of 25C reaches 75% of the discharge current of 1C.
The One-Step ADI-FDTD for Periodic Structures and its Stability
Authors: Mao Yun Fei , Wu Hong Bing , Ou Lin
Published: April 2014

In this paper, the stability analysis of the unconditionally stable one-step leapfrog alternating direction implicit (ADI) finite-difference time-domain (FDTD) method for periodic structures is presented. The amplification matrix of the proposed leap-frog ADI-FDTD method is obtained through the spatial domain with Fourier method and eigenvalues of the Fourier amplification matrix are obtained analytically to prove the unconditional stability of the periodic leapfrog ADI-FDTD method. Numerical verification is proposed to confirm the theoretical result.
Design of a Functional Signal Generator Based on MAX038 and Microcontroller
Authors: Hu Hao
Published: April 2014

Based on SCM STC89C52 and MAX038, a function signal generator for generating a frequency and amplitude can be programmed to adjust the sine wave, square wave and triangular wave signal. MAX038 function generator with a small amount of peripheral devices are responsible for generating waveforms, which then are input into the LM6361 wideband voltage amplifier and a power amplifier is output. Master STC89C52 is responsible for selecting and managing the waveform types, frequency adjustment, output amplitude adjustment, LCD, and keyboard work of each module operation.
Multi-CPU Parallel Computing System with Mixed Modes
Authors: Wei Feng Mei , Zhang Jian Pei , Li Bing , Yang Jing
Published: April 2014

Multi-CPU[1] parallel computing system [2] with mixed modes is the product of parallel computing idea. Control system cannot guarantee real-time control performance due to limitation of computing speed while utilizing complex control algorithms, so operating efficiency of the system needs to be solved. High-speed computing [3] system is needed. Parallel algorithm [4][5] is an effective way to improve computing speed. Mixed-mode parallel computing system is a hardware platform with multiple parallel computing modes. Users can directly change the connecting mode between computing modules through jumper, and the diversity of communication modes provides solutions for various problems.
The Optimal Control Method of Impulse Response in Prosthetic Leg
Authors: Xiao Xin Yi , Xiao Han Bin
Published: April 2014

Passive control and semi-active control of vibration in mechanical systems have recently successfully been used in automobiles and airplanes suspension systems. These control techniques are able to guarantee the performances of all vibration structures. Unfortunately, the knowledge and data has not been readily applied to human prosthetics. The information collected can be directly applied to accelerate research into dampening for prosthetics. A focus of this paper is on modeling and controlling vibrations by a given impulse onto prosthetic legs. Simulations of using passive control and idealized skyhook dampening are using Matlab to complete. Through model analysis, control variable, simulation procedures and comparison of two modeling, the models have been refined and with idealized skyhook dampening suspension provide significant improvement of the body characteristics compared with passive suspensions.
A Cooperative Positioning Scheme Based on Extended Kalman Filter for Curve Warning Systems
Authors: Du Lei , Liu Nan , Fang Rui , Song Xiang Hui
Published: April 2014

Cooperative positioning (CP) is one of the core features in intelligent transportation systems (ITS) which is used to increase the positioning accuracy via wireless communication between vehicles and infrastructures. The global navigation satellite system (GNSS) is always unavailable near black spot such as the curve which needs to be solved. So, in this paper, a novel CP scheme is proposed for the curve warning scenario with limited GNSS by utilizing the information of received signal strength and pointer angular of the roadside unit which is in a special dual-transmitter outphasing architecture. An extended Kalman filter is founded to estimate the real-time position of the vehicle in the curve section. The whole warning scenario is analyzed by computer simulation, and the result shows the feasibility of the method.
A Hybrid Approach for Stripe Noise Removal in Frequency Domain
Authors: Wang Si Le , Zhang De Qing , Fan Shi Yong , Li Sen , Yang Wen Zhu
Published: April 2014

Stripe noise always occurs in line-scan images which can seriously affect the image quality for future usage. To eliminate the stripe noise from the polluted line-scan images, a hybrid approach for stripe noise removal in frequency domain was presented. Firstly, the mathematical model of the stripe noise was established to describe its character. Secondly, the information of the stripe noise was separated from other information of the image by wavelet decomposition. Then, a band stop filter was designed for removing the stripe noise from the separated details band in spatial-frequency domain of Fourier. At last, the denoised image was obtained after wavelet reconstruction. The results indicate that the proposed approach can remove the stripe noise effectively from the polluted line-scan image while preserving as much details of the object in the image as possible.
Analysis of the Influences of Drilling Fluid Flow Velocity inside and outside the Drilling String on Drilling String Lateral Vibration Frequency
Authors: Hou De Da , Zhang Qing Bin , Cui Yun Hua , Zhang Cheng Dong
Published: April 2014

Drilling string lateral vibration is a severe damage,which is influenced by many complex factors. This paper makes a theoretical analysis of the drilling string lateral vibration frequency caused by drilling fluid flow velocity inside and outside the drilling string, which supplies some evidence for calculating rotation speed of rotary table and reduces the times of drill string resonance. The influence of drilling fluid flow velocity inside the drilling string on lateral vibration frequency is analyzed by Euler method. Besides, through the use of mechanical analysis method and the introduction of additional mass coefficient. A differential equation of drilling string lateral vibration with the consideration of drilling fluid flow velocity inside and outside the drilling string is built up, and a mathematical model of drilling string lateral vibration under the influence of drilling fluid flow velocity is obtained. Field applications indicate that this model is in agreement with the field condition.
Hysteresis Modeling of Soft Magnetic Materials Using LabVIEW
Authors: Su Liang Yu
Published: April 2014

Hysteresis cycle is one of the most important characteristics for magnetic materials.Preisach model is one of most used model in practice for modeling the hysteresis cycle. This paper deals with analytical modeling of hysteresis cycle using the powerful mathematical tools from LabVIEW. Preisach method is also modified by LabVIEW,this way of modeling is good for a fairly large number of entry points.
Study on the Ground Response Analysis for Stiff Soil
Authors: Li Xiao Fei , Sun Rui , Yu Xiao Bo
Published: April 2014

In order to test the applicable of the seismic response analysis procedures SHAKE2000 and LSSRLI-1 for class ІІ site, 17 stations and 35 underground strong motion records of KiK-net are selected from Class ІІ site. 210 working conditions are used to verify the applicability of the two soil seismic response analysis programs at Class ІІ site. These two programs are used to calculate the selected working conditions, giving the peak acceleration of the ground, the shear strain and the ground acceleration response spectra. By analyzing the results of the two programs and the measured results to assess the degree of difference between the two methods and which program is closer to the real situation. Studies have shown that in class ІІ site, in most cases, the results of SHAKE2000 and LSSRLI-1 differ little. While comparing with the actual records, SHAKE2000 is closer to the strong motion records.
Rolling Element Bearing Diagnosis Based on Signal Reconstruction from Edited Cepstrum
Authors: Dai Shi Chao , Gao Yan , Guo Yu
Published: April 2014

A feature extraction scheme for rolling element bearing (REB) fault diagnosis by editing the cepstrum of the original vibration is introduced in this paper. In the presented approach, the order analysis technology is utilized to convert an even-time-spaced scaled signal to an even-angle-spaced signal by resampling the acquired signal. The discrete lines belonging to gears are removed by editing the cepstrum. Then, the signal is reconstructed from the edited cepstrum. Lastly, clear characteristic frequencies related with the faulty REB can be obtained by the envelope spectrum analysis. Simulation studies indicate that this method can be employed to detect the REB faults in a gearbox with a high accuracy by removing the strong gear vibration disturbances.
Simulation Research about Signals Processing of Optic Fiber Sensor Array Sensitive to Heavy Metal Ions
Authors: Hu Wei Jun
Published: April 2014

Considering the approximation between Gaussian function and spectrum, Gaussian function is utilized to simulate the spectrum of optical fiber sensor array sensitive to four heavy metal ions. The division of superimposed spectrum in measurement by optical fiber sensor array and the analysis of relative error are simulated by Matlab software. From the simulation, it is known that the superposition error of spectrum caused by interference between four ions in films sensitive to heavy metal ions can be reduced with corresponding arithmetic, which provides good theoretical foundation for preparation of optical fiber sensor array and signals processing of spectrum.
Surface Displacement Measurement of Soil Mass by White Light Digital Image Analysis in Frequency Domain
Authors: Li Jun Jun , Yang Shi Zhu , Shi Wen Guang
Published: April 2014

The surface displacement of soil mass is an important standard for safety in civil engineering. In this paper, white light digital image analysis in frequency domain is introduced tomeasure surface displacement of soil mass. This method has the characteristics of whole-field, non-contact measurement and the simple measuring system and can obtain displacements by frequency domination correlation arithmetic. Surface displacements of soil mass are obtained by white light digital image analysis in frequency domain. Comparing the experimental results and the theoretical values, the little error exists and the usefulness of this method is certified.
A Calculation Model for On-Line Monitoring of Conductor Galloping Based on the Length Method
Authors: Xiong Xi , Zhu Yong Li , Fan Guo Chen , Yan Hong Wei
Published: April 2014

This paper analyzed the advantages and disadvantages of several current on-line monitoring approaches to transmission line galloping, noting the comparatively strong economy and feasibility in the Conductor Length Method. Based on the length method, taking the data measured at tension sensors and the angle sensors as the basic parameters, this paper established a calculation model for the monitoring of galloping. The paper applied this model into calculations, whose results basically consistent with the on-site monitoring data, which verifies the accuracy of the calculation model.
A Hierarchical and Clustering Strategy for Routing in WSN Based on Ant Colony Optimization
Authors: Zhang Yu Cheng , Qiu Xing Guo , Hao Zhan Jun
Published: April 2014

Since the energy of wireless sensor nodes is limited, the protocols of wireless sensor network (WSN) we design should care about problems of balancing energy of nodes. After analyzing current algorithms, this paper puts forward an hierarchical and clustering strategy for routing based on Ant Colony Optimization (HC-ACO). The protocol divides the nodes into fixed clusters, each cluster selects a Cluster Header (CH) and switches the CH by its energy and other restrictive conditions. And it adopts ACO to search the optimal path between the CHs and Sink node. The simulation indicates the protocol can balance energy consumption of nodes of network.
An Improved Method of the Adaptive Hierarchical Space Partition Simplification Algorithm on the Point-Based Model
Authors: Chen Jie , Cheng Jun Ting
Published: April 2014

The 3D scanning device can capture millions of points with the excellent geometrical precision except for large amount of redundant ones, which could bring some difficulties for the subsequent digital geometrical processing (DGP), so the simplification of the point cloud has become a considerable study in point cloud applications. Given this problem, we propose a novel approach, which could decrease the geometrical error by partitioning the surface into many patches with some similar geometrical features before using the adaptive hierarchical space partition (AHSP) approach, in order to improve the AHSP simplification. We also experiment on three models and do comparative analysis. Fortunately, the results prove that our algorithm can make the anisotropy feature in the surface of the models described explicitly, the geometrical error decreased by 15.8 percent, and the simplification rate kept up with other approaches. In addition, it can provide the high quality models for the 3D digital model editing, such as the geometrical modeling, the point cloud blending.
CFD Simulation Study of Gas-Liquid Flow Regimes in Inclined Wellbore
Authors: Zhang Yin Di , Ruan Long Fei , Liu De Hua
Published: April 2014

Computational Fluid Dynamic (CFD) was used to investigate gas-liquid two phase flow regimes for the inclined wells. The simulation results were compared with the Taitel chart. A good agreement between the prediction and the Taitel flow regimes shows that CFD method can reasonably predict flow regimes in the inclined well. Another further study was conducted to explore the influence of flow rates and inclination angle on flow regimes. The results show both of flow rates and inclination angle have a significant effect on flow regime transition.
Study on Energy-Saving Efficient Resource Scheduling Optimization Algorithm in Cloud Computing
Authors: He Dan Dan , Hou Hong Feng , Wang Li Juan
Published: April 2014

It is a critical problem that schedules cloud resource in cloud environment. Based on the characteristics of cloud computing and analysis on cloud computing resource scheduling model framework, and the traditional resource scheduling of cloud computing is only concerned the maximum completion time of the task, without taking into account the energy consumption problem, this paper uses an improved particle swarm optimization, that is, when the optimal solution did not change for two generations, traversing through the chaotic particle method for local optimization to accelerate access to global optimal solution. Then, compared this algorithm with other scheduling algorithms by simulating, proved that better scheduling scheme can be achieved, as well as the effectiveness and practicality of the algorithm.
Study on the Prediction of Line Loss Rate Based on the Improved RBF Neural Network
Authors: Ren Ye , Zhang Xiu Ge , Huang Xun Cheng
Published: April 2014

According to characteristics of medium voltage distribution network, use raw data that are easily collected to study an accurate fast and simple line loss calculation method of the medium voltage distribution network, that is the radial basis function neural network algorithm. In order to improve the power system line loss rate accuracy, the paper puts forward using alternating gradient algorithm to improve the radial basis function (RBF) neural network. The simulation results show that the algorithm is feasible.
The Research of Orthogonal Symmetric Matrix-Valued Wavelets Packets with Multiscale and Applications
Authors: Chen Qing Jiang , Cai Chuan Li , Zhao Jian Tang
Published: April 2014

Material science is an interdisciplinary field applying the properties of matter to various areas of science and engineering. In this work, we introduce orthogonal matrix-valued wavelets with poly-scale, which are wavelets for vector fields, based on the notion of full rank subdivision operators. It is demonstrated that, like in the scalar and multiwavelet case, the existence of an orthogonal matrix-valued scaling function guarantees the existence of orthogonal matrix-valued wavelet functions. Secondly, we propose a construction algorim for compactly supported orthog onal two-directional matrix-valued wavelet packets. Lastly, A method for constructing a class of compactly supported orthogonal matrix-valued wavelets is presented by means of matrix theory.
The Triangle Network Based Precise Correction Method and its Algorithm
Authors: Zhan Zi Cai
Published: April 2014

The proposed a new design idea in precision correction, namely triangular network correction (TIC), this method makes the image error correction is basically in a pixel or range after precision correction, algorithm of triangle network and the precision correction, using triangular network precision correction method and the conventional resampling precision correction in standard space control point position error correction were compared with that in some occasions, correction, triangular network precision correction method is more suitable for precision correction method conclusion.
A New Intrusion Detection Method Based on Rough Sets for Network Security
Authors: Jiao Na
Published: April 2014

In this paper, we introduce a new intrusion detection method based on rough sets for network. The first step consists of feature selection which is based on rough set theory. The next phase is clustering by using Fuzzy C-Means. Rough set theory is an efficient tool for further reducing redundancy. Fuzzy C-Means allows objects which are belong to several clusters simultaneously, with different degrees of membership. To evaluate the performance of the introduced approaches, we applied them to the international Knowledge Discovery and Data mining intrusion detection dataset. Experimental results illustrate that our algorithm is accurate models for handling complex attack patterns in large network.
An Robust Video Watermarking against Collusion Attacks
Authors: Wu Ge , Du Chun Hui , Zhang Shuang
Published: April 2014

An Video Watermarking is proposed to improve the robustness against collusion attacks. The Using this new algorithm, all video frames are first divided into several sets so that frames of each set carry the same watermarks. Then in each group of frames, watermark is estimated. it has been shown that the watermarking maker can use this algorithm to build sets of frames carrying the same watermark for avoiding collusion attacks.
Application of K-Means Algorithm with Person Coefficient in Colleges Physical Education
Authors: Xi Lian Zheng , Zhao Bao Jin
Published: April 2014

For developing students' personality and interest of participating in physical exercise, improving students physical fitness, schools at all levels have carried out useful Physical Education exploration and reform. However, by the restrictions of teaching management system, physical education teachers and teaching venues and facilities, the students' physical condition is not improved ideally. Under existing conditions, how to use Pearson coefficient K-means algorithm to optimize physical education according to the students 'sports quality has become a topic worthy of study. It can guide how to set the physical education curriculum and teaching content, so as to promote the healthy development of students' physical fitness.