bluuebunny/crossref_metadata_2025 huggingface dataset:
Similarity Measure between Vague Sets Based on Products
Authors: Yang Qing Bo , Xue Ruo Juan
Published: October 2014

A new method for measure similarity between vague sets is proposed in this paper. Multi-criteria evaluation problems are used in decision-making constantly. Vague sets model is used to describe multi-criteria evaluation problems in this paper. And the similarity measure method based on products is used in sorting alternatives. The proposed method can solve the multi-criteria evaluation problems in a reasonable and objective way.
A Novel Image Fusion Method Using Non-Subsampled Shearlet Transform
Authors: Xing Xiao Xue , Cao Fu Cheng , Shang Wei Wei , Liu Fu
Published: October 2014

As a novel MGA (Multiscale Geometric Analysis) tool, shearlet is equipped with a rich mathematical structure similar to wavelet. In this paper, a novel image fusion method using Non-subsampled Shearlet Transform is proposed. First, the source images are decomposed into low-pass and high-pass subbands using NSST. Second, the high-pass subbands coefficients of the images are fused according to the average gradient. Third, the low-pass subbands coefficients of the images are fused by the weighted regional entropy. Finally, the image is reconstructed by the inverse non-subsampled shearlet transform. In the method, two sets of source images and five objective parameters are used to test the algorithm. The experimental results show that the proposed method is better than the conventional DWT-based and NSCT-based methods.
Digital Filter Application for Squelch on Industrial Frequency Noise and its Harmonic Waves Interference
Authors: Wen Wei Jun
Published: October 2014

Industrial frequency and its harmonious waves are one of the main interferences in electronic measurement, which will cause severe influence on test accuracy. Digital filter is better than analog filter at resolution; furthermore multi-band stop digital filter design is unrealizable for analog filter design method. This paper designs an FIR(Finite Impulse Response) multi-band stop digital filter to reject the noise of 50 Hz and its harmonic waves from power network, whose stop bands are respectively as 48~52 Hz, 98~102 Hz and 148~152 Hz. Simulation results prove that the noise can be depressed to 30 dB. To analyze the filtered signal can improve accuracy of the test system. The whole course includes two parts, which are filter mathematical modeling and filter algorithm implementation on worksite data.
Signal Compression Reconstruction with Narrow-Band Interference
Authors: Li Yong Jie , Xu Dong Jiao , Wang Xin , Chang Ying
Published: October 2014

Compressive sensing (CS) implements sampling and compression to sparse or compressible signals simultaneously. Compressive signal processing is a new signal processing scheme base on compressive sensing theory. In this paper, the problem of signal compressive reconstruction base on narrow-band interference is researched. The reconstruction performance of BP, MP, and OMP algorithms with narrow-band interference is analyzed by computer simulations.
Clustering within the Framework of Hesitant Fuzzy Sets
Authors: Wang Yi Zhi , Zhang Ying Jun , Dong Lan
Published: October 2014

In this paper, we propose a variety of correlation coefficient measures for hesitant fuzzy sets (HFSs) and investigate their properties. Moreover, we utilize the concepts of correlation relation matrix, composition matrix and equivalent correlation relation matrix to deal with the clustering problem under hesitant fuzzy environment. Finally, a numerical example is utilized to validate the proposed correlation coefficient measures and the clustering method.
Discrete Element Simulation and Analysis for Max Density Curve Theory of Mineral Aggregate Mixtures
Authors: Deng Jia Xi , Zhou Xiao Dong , Huang Ya Ting , Liu Yu , Fan Wei Min
Published: October 2014

In highway pavement engineering, mineral aggregate gradation is a key consideration in mixture design. The max density curve theory is one of the most popularly-used methods to design mineral mixture gradation. The main objective of this research is to present a numerical method for investigating impacts of mineral aggregate properties on model parameters of the max density curve theory. Through this study it was found that the maximum particle size gave an important impact on the model parameters, even though the model parameter n is around 0.45 for popularly-used mineral mixtures.
An IPTV Recommendation Method Based on Latent Context
Authors: Guo Wen Ming , Sun Liang
Published: October 2014

In the light of the data differences between network television and the Internet, this paper solve the problem of grading IPTV by the introduction of time context information and computing the latent scores based on the traditional and item-based collaborative filtering recommendation algorithm. Construct the user - item, the item - time model and optimize item similarity calculation so as to ease the difficulty of searching the similar item due to the data scarcity. The experimental results show that the improved method can obviously increase the recommendation precision and has a certain effect on reducing the impact of data scarcity compared with the traditional item-based collaborative filtering.
Deployment and Exploration of Domain Name System Based on IPv6
Authors: Tian Hong Cheng , Wang Hong
Published: October 2014

IPv6 is intended to replace IPv4 in the Internet. Domain Name System (DNS) is an essential component of functionality of Internet. This paper presents new IPv6 characteristics, IPv6 DNS hierarchy, working process of IPv6 DNS, IPv6 address types, representation formats of IPv6 address, forward (reverse) resolver of IPv6 DNS, and the DNS transition from IPv4 to IPv6, combined with the practice to build the IPv6 experimental network of Peking University. We give corresponding solutions for the problems encountered in the IPv6 DNS deployment. This paper is of important reference value for IPv6 network researchers and engineers to build IPv6 DNS service in the IPv6 network.
The Design and Implementation of a Heterogeneous Multi-Core Security Chip Architecture Based on Shared Memory System
Authors: Zhang Lei , Dong Ren Ping , Zhang Chang , Yu Ya Ping
Published: October 2014

With the existence of traditional SOC chip, the encryption and decryption speed and low power cannot meet the computing needs of the modern diversity, then we present a heterogeneous multi-core system which designed based on shared memory on the Xilinx Virtex-5 platform. This paper is in-depth research about heterogeneous multi-core password architecture, static task partitioning, scheduling strategy and the communication mechanism between cores. The three cores systems are designed and builded based on shared memory to realize ZUC algorithm which generates a stream cipher on virtex-5 platform. The three microblaze cores are responsible for inter-core communication, the implementation of ZUC algorithm and articulating IC card to read keys. Through the design of three cores system, give full play to the hardware, software and computer architecture parallelism at all levels to improve the performance of the algorithm to achieve high performance green computing.
The Study on Non-Line-of-Sight Ultraviolet Communication System in the Atmospheric Turbulence
Authors: Wang Yong
Published: October 2014

In the atmospheric turbulence, the effects of atmospheric turbulence and transmitted optical power on the BER performance of ultraviolet communication system are analyzed and simulated. The simulation results show that when the atmospheric turbulence strength changes from weak to strong, the BER performance deteriorates along. Compared to OOK intensity modulation, the BPSK subcarrier intensity modulation can be more effectively to inhibit atmospheric turbulence effect on ultraviolet communication system. Under the certain atmospheric turbulence strength, the BER performance of ultraviolet communication system will be improved along with the increase of the transmitted optical power.
Design and Implementation of a CAD Software System for Hull Lines
Authors: Zhang Wei , Wang Zheng
Published: October 2014

A CAD software system for hull lines based on .NET is introduced in terms of system construction and principle. The system adopts a 3D V-shaped fairing computing model, which sufficiently considers the consistency of lines offsets in three different projection planes. By means of tree structure for parametric hull lines and 3-dimensional modeling technology, the system supports total-process-design of hull lines. Such a system not only can draw main parameter table, lines offsets table and lines plan grid automatically, support interactive design and synchronous adjustment for hull lines, but also can cut the hull synchronously and produce the 3-dimensional model of the hull. The implementation of this CAD software system for hull lines improves the hull design efficiency and quality.
Decoupling Replication from the Producer Consumer Problem in Internet QoS
Authors: Li Jie , Teng Zhen Fang
Published: October 2014

Many theorists would agree that, had it not been for the emulation of 802.11b, the simulation of digitaltoanalog converters might never have occurred. Here, we validate the understanding of multicast solutions. In this work, we validate not only that A* search and Btrees can synchronize to address this problem, but that the same is true for the UNIVAC computer.
Chaotic Vibration of Fractional Calculus Model Viscoelastic Arch
Authors: Huang Fan , Huang Jun , Dai Shao Bin
Published: October 2014

Nonlinear dynamic behaviors of the fractional calculus model viscoelastic arch are discussed in this paper. The motion equations governing dynamic behaviors of the viscoelastic arch is derived and simplified by Galerkin method. The numerical method for solving the motion equations with fractional calculus is presented here. The influences of the load parameter and the material parameter are considered respectively. The results show that the chaotic vibration of the arch appears in forced vibration. And both the load parameter and the material parameter affect the dynamic behavior of the arch. With the increasing of the load parameter, the motion states changed from periodic motion with period 1 to complex motions, such as mult-periodicity, quasi-periodicity or chaos. The increasing of the material parameter benefits the stability of the structures.
Beier Depression Petroleum System Study in Hailaer
Authors: Wang Jing Yi , Shi Shang Ming , Du Xian Li
Published: October 2014

Through the study of Beier depression accumulation critical moment, divided into three sets of petroleum system in beier depression: passive faulted depression primary petroleum system, active faulted depression primary petroleum system and fault depression transform secondary petroleum system. Through the typical reservoir oil-water distribution rule and reservoir dissect result can get to know oil and gas of Beier depression concentration distribute in passive faulted depression sequence petroleum system, mainly develop reverse fault block reservoir as well as buried hill reservoir blocked by fault and uncomformable surface, active faulted depression sequence petroleum system mainly develop structure and fault-lithologic composite reservoir; Secondary petroleum system mainly develops fault lithologic reservoir; Secondary petroleum system and primary petroleum system ‘complementary’ distribution of oil and gas. Through the petroleum system classification, to find the distribution regularity of oil and gas, and guide field work.
Analysis of the Expansion Behavior and In-Stent Restenosis of Coronary by Finite Element Method
Authors: Jiang Xu Dong , Teng Xiao Yan , Shi Dong Yan
Published: October 2014

Restenosis is a re-narrowing or blockage of an artery at the same site where treatment like stent procedure has already taken place. The aim of this study is to more conclusively identify the mechanical stimulus for in-stent restenosis by means of numerical model based on the finite element method. The finite element model simulating the stent, balloon, crimping tool and artery interaction in the coronary artery is developed. The present model is used to determine the stress distribution in the artery wall followed by stent implantation. It is indicated that the compliance mismatch of stent with vascular induces the stress concentration in the stented artery, which impact the level of vascular injury caused to the artery by the stent. This study supports the hypothesis that the artery develops restenosis in response to injury, where high vessel stresses are a good measure of the injury.
Virtual Machining Environment Construction in Vericut for Process Planning
Authors: Huang Xue Mei , Zhao Li Hong , Tong Yong Xiang
Published: October 2014

Virtual machining environment in Vericut was proposed with purpose of enhancing process planning practice training for undergraduates. Main issues include construction of virtual manufacturing resource library and virtual machining process execution environment for planned process. Virtual manufacturing resource library is composed of virtual and digital models for diverse kinds of machine tools. Type determination and classification principle of machine tools and virtual equipment modeling method in the proposed environment are studied. Virtual machining for particular process by multi setup and cut stock transfer method are defined. The proposed Virtual machining process execution environment provides effective ways for enrolled undergraduates applying machining knowledge in process planning, gaining experience with advanced machine tools and manufacturing technology in industrial world.
Effect of Clearance on Thermodynamic Characteristics of Woven Liner Spherical Plain Bearing
Authors: Qiu Ming , Duan Chuang Chuang , Chen Long , Li Ying Chun , Hu Ren Song
Published: October 2014

The mechanical property of woven liner spherical plain bearing in different clearance has been analyzed using the finite element software. It indicated that when the positive clearance of woven liner spherical plain bearing is 100um, the maximum stress of its inner ring is the lowest. The position of the maximum stress is in the middle of the inner ring. That makes the bearing has a bigger carry capacity. Based on above analysis, the thermal properties between the friction pair of woven liner spherical plain bearing which clearance is 100um is also analyzed. The node temperature variation trend of inner ring and liner along with the analysis process is obtained.
Analyzing and Modeling for Liquid Cargo Handling of LNG Simulator
Authors: Cao Jing Hua , Zou Xiang
Published: October 2014

In order to accelerate the development for LNG carrier liquid handling simulator, this paper describes the liquid handling process. Approaches to composition of interactive mathematical models for the system are outlined. The connections between these models are described. In view of the current situation of simulator development, this paper also provides the perspective of the whole model system. As the result of incorporation of these models into the simulator, the system is being developed by model-based design methodology. It is expected through this paper that the development of the simulator can reduce training time and cost because the researchers can understand the overall modeling process from system level.
Fatigue Life Prediction and Verification for HIC Hermetical Sealing under Random Vibration Loading
Authors: He Xiao Qi , Wang Jun De , Zhu Jun Hua , Li Xun Ping , Liu Jun Fu
Published: October 2014

This work aims to predict fatigue life of hybrid integrated circuit (HIC) hermetical metal sealing structure mounted on PCB under random vibration loading. The prediction method consists of following steps. Firstly, finite-element model was developed to obtain model parameters (including natural frequencies and mode shapes) and power spectral density (PSD) of the critical part of sealing structure by ANSYS workbench. Secondly, modal test and random vibration test were conducted to verify the results of simulation. Thirdly, the Von Mises stress PSD was transformed into time-history data through inverse Fourier transform with Matlab program after calculating from the FEA results. The rainflow-counting algorithm was employed to evaluate cumulative damages of the critical part. The material’s S-N curve, Palmgren-Miner’s damage accumulation rule and rainflow-counting algorithm were used to predict fatigue life. A specially designed fixture and board with heat sink were used in the experiment to verify the first five mode shapes and response spectrum of the six critical points with hammer excitation. The calculation result of in this study is 70.3 hours which could be a reference for structural design of hybrid integrated circuit hermetical metal sealing under vibration conditions.
Mechanical Characters of Six Engineering Timoshenko Beams
Authors: Tian Hong Liang
Published: October 2014

Timoshenko beam is an extension of Euler-Bernoulli beam to interpret the transverse shear impact. The more refined Timoshenko beam relaxes the normality assumption of plane section that remains plane and normal to the deformed centerline. The manuscript presents some exact concise analytic solutions on deflection and stress resultants of NET single-span Timoshenko beam with general distributed force and 6 kinds of standard boundary conditions, adopting its counterpart Euler-Bernoulli beam solutions. Engineering example shows that scale impact would not unveil itself for micro structure with micrometer μm-order length, yet will be prominent for nanostructure with nanometer nm-order length. When simply supported CNTs is undergone to a concentrative force at the median and complete bend moment, scale action is observed along the ensemble CNTs, while it unfurls itself the most at the position of the concentrated strength. When a clamped-free CNTs is exposed to a centralized force at the mesial and distributed force, there is no scale impact about the deflection at all positions on the left border of the concentrated strength position, while such operation inspires at once at all positions on the right margin of the concentrated strength position. When a clamped-clamped CNTs is lain under a concentrative strength at the middle, the deflection of NET Euler-Bernoulli CNTs reflects scale effect completely. Notable differences between the deflection of Euler-Bernoulli CNTs and that of Timoshenko CNTs are reflected at large ratio of diameter versus length. The deflection of NET clamped-free and simply supported Timoshenko beam doesn’t introduce surplus scale process in terms of its counterpart, NET Euler-Bernoulli beam. However, the deflection of NET clamped-clamped Timoshenko beam does involve additional scale impact solely including the method when the concentrated strength position is at the midway in the beam-length direction.
Mixed Lubrication and Friction Power Loss of Piston Ring Pack
Authors: Liu Xiao Ri , Li Guo Xiang , Bai Shu Zhan , Hu Yu Ping
Published: October 2014

With consideration of asperity contact, the minimum oil film thickness and friction power loss are calculated by simultaneous solution of the dynamics, blow-by and lubrication of piston ring pack. Take the piston ring pack in the first cylinder from the free end of a six-cylinder diesel engine for example, results show that the asperity contact takes place at all of the compression rings and oil ring; the minimum oil film thickness is 1.04μm at the top ring; the total friction loss power is 0.94kW, the top ring accounts for 37.2%, the second ring accounts for 33.0%, the oil ring accounts for 29.8%.
On the Force of Rotor-to-Stator Element Radial Rubs in Rotating Machinery
Authors: Hong Li , Zhan Li , Qing He
Published: October 2014

Rubs between stator and rotor are the most common and destructive faults in starting or running of rotating machinery. Force of radial rubs is the main parts of rubbing system dynamic models, and determines their accuracy directly. Force model is very important for fault diagnosis in theories and its applications. The recent studies on force models of radial rubs are introduced. Their modeling theories and its applications are summarized. The used conditions and applications scopes are analyzed mainly. The advantages and disadvantages of different models are discussed. It is pointed out that describing rubbing force accurately and building useful models will be the future studies, based on rational theories, considering environment factors, choosing all kinds of parameters affected to models.
Ultrasonic Testing for the Hardened Layer Depth of Induction Quenched 20CrMo Axle
Authors: Fan Ying Yuan
Published: October 2014

The interface between the surface hardened layer and the base layer would produce while the 20CrMo axis is treated with high frequency induction quenching method; therefore, the hardened case depth can be measured by high frequency ultrasonic wave based on the echo technique. The test results compared with those from the metallographic method show good qualitative agreements.
Research on the Acoustic Insert Loss in Water Filled Pipes
Authors: Lu Xue Song , Li Qi , Liu Juan
Published: October 2014

Water filled pipe as an experimental model of the sea pipeline on ships, the study has very important significance of the sound propagation characteristics. In this paper, eigenfunctions of pipeline interior sound field are theoretically calculated at first. And through the Matlab software simulation calculation, the cutoff frequency is shown. And then, the water filled pipe acoustic insertion loss is given by the experimental study. Through the research, we validate the cutoff frequency calculation, and gives the insertion loss of pipelines.
Orthogonal Experiment on Characteristic Parameters of Oil-Air Lubrication System
Authors: Sun Qi Guo , Zhou Zheng Hui , Wang Yue Fei
Published: October 2014

Orthogonal experiments on oil content are done on a test rig in our lab by ECT (electrical capacitance tomography) technology under different experiment data groups which includes 3 kinds of characteristic parameters, such as air pressures, oil volume-per-cycle and lubrication cycle, of the system. The influence degree of the three characteristic parameters on oil content is sorted, and then the optimum experimental conditions resulted in the smallest oil content and the most stable distribution of oil film are obtained respectively from the experiments, and finally the change trend of the effect of lubrication cycle on the oil content is got by changing lubrication cycle, one of the 3 characteristic parameters, at a time and keeping 2 left characteristic parameters at the best level above proposed. These results will help us to research and apply further in the oil–air lubrication system.
Motion Model of Two-Wheel Differential Drive Mobile Robot under Variable Load
Authors: Ruan Zhi Hu , Wang Niu , Ran Bing Xin
Published: October 2014

Based on kinematics characteristic of two-wheeled differential drive mobile robot (WMR) and response characteristic of fact motor drive system, this paper presents the analysis method of the equivalent rotation inertia, and the entire vehicle load is assigned to each wheel, and then the wheel load is converted into the corresponding equivalent rotation inertia of the motor shaft of each wheel, and motion model of WMR are obtained for combining with quasi-equivalent (QE) state space model of double-loop direct current motor systems under variable load and kinematics model of WMR under the load changes. By using speed response data of the actual system and combining with genetic algorithm to accurately identify the model parameters. Finally, through experiments results of the WMR motion model and the second order model respectively comparing with the actual system which demonstrates the effectiveness of the proposing method and model.
Research on the Kinematics of Line Heating Robot Based on SVM
Authors: Li Yan , Chen You Li
Published: October 2014

The paper mainly analyzed the robot kinematics of the line heating plate. In order to realize the moving of complex trajectory for the robot, a forward kinematics modeling and the simulation of inverse kinematics are carried out. Firstly, with the D-H modeling method, the line heating plate robot forward kinematics equations and the spatial geometric model of the manipulator are set up, then multi-input multi-output systems based on support vector machines algorithm is used to establish the inverse kinematics model for the robot . At last, the simulations of tracing complex trajectory with the inverse kinematics model are carried out, and the results show that the model derived by SVM can trace the trajectory very well.
The Stewart Platform Dynamic Model Coupling Characteristic Analysis
Authors: Han Lei
Published: October 2014

The method for Stewart platform decentralized control in joint workspace, need to find and use the model for decentralized control. Therefore, according to the symmetry of structure characteristics of the platform reveal the inertia matrix block diagonal dominant characteristics of joint space. Analyze the inertia matrix block diagonally dominant characteristics of the platform site, and then come to the platform parameters which can meet the block diagonally dominant index.
A Novel Greenhouse Control System Based on Fuzzy Neural Network
Authors: Zhang Xin Yi
Published: October 2014

Due to the complexity of greenhouse environment, greenhouse system cannot be controlled perfectly by traditional control method. This paper proposes a novel greenhouse control system based on fuzzy neural network to regulate the internal climate of the greenhouse. Temperature and humidity are selected as the inputs of controller, while the skylight, sun-shade net, circulation fan, side windows, fuel heater, and micro-mist humidifier are selected as the outputs. After analyzing every situation that may occur in the control process and the corresponding control strategies, we obtain 35 control “IF-THEN” rules. Simulation results show that the fuzzy neural network controller have certain improvements than the conventional PID controller in the aspects of overshoot, stability and response time.
Application of Fuzzy PID Control Based on GA in Control Valve
Authors: Zhou Yang , Wang Zhi , Yang Li
Published: October 2014

In order to improve the dynamic characteristic of regulating valve system based on traditional fuzzy PID, a control strategy was presented and this method combines fuzzy PID and improved GA (genetic algorithm) to optimize fuzzy rules. Finally a simulation was carried on in MATLAB. The results show that: Compared with the traditional PID, the fuzzy PID enables the system to achieve better dynamic characteristics.
Design of SVC Damping Controller Based on Biogeography-Based Optimization Algorithm
Authors: Yang Wu Gai , Ke Li Na , Dong Fei Fei , Zheng Zhi Ping
Published: October 2014

On account of that common subsynchronous resonance controllers cannot well adapt to the time-varying and nonlinear characteristics of power system, biogeography-based optimization (BBO) algorithm is introduced to design subsynchronous damping controller optimally based on the mechanism of suppressing SSO by static var compensator (SVC). The simulatied results of Jinjie plant indicate that the subsynchronous damping controller optimized by BBO algorithm can remarkably improve the damping of torsional modals and thus effectively depress the multimodal SSO, ensuring the safety and stability of units and power grid operation.
Modeling and Simulation of Boost Converter with Voltage Feedback Control
Authors: He Qiang
Published: October 2014

In order to achieve a proper design and control, it is necessary to have an exact model of boost converter. In this paper, the mathematic model of boost converter is proposed by the state-space average method. In the next step, the open-loop transfer function model without compensation is deduced in detail according to the mathematic model of the boost converter, the controller is designed according to frequency domain. The phase margin and magnitude margin of the open-loop system of the boost converter with compensator have both been increased. After compensating, the control system becomes stable. Using Matlab 7.1, the simulation of the control system of boost converter was implemented. The simulation results of control system confirm that the controller can reduce steady state error and resist power supply disturbance.
Modeling and Simulation of LQR Control for DC Motor
Authors: He Qiang
Published: October 2014

A control system for DC motor should be designed to meet the desired performance objectives with the smallest control energy. LQR controller can satisfy the requirement. In this paper, the state space model of DC motor control system is proposed. The key problem to apply LQR controller is to choose the correct weighted matrix Q and R of performance index. At present, there is no formulaic approach for this problem. This kind of LQR controller based on PSO algorithms, which can obtain satisfying control results, is presented for DC motor control system. Using Matlab 7.1, the simulation of the DC motor control system is implemented. The simulation results of it confirm that the LQR controller can reduce steady state error, improve response speed, and resist power supply disturbance.
Numerical Simulation of Aircraft Ditching Based on ALE Method
Authors: Hu Wei , Wang Yong Hu , Chen Cai Hua
Published: October 2014

Aircraft Ditching is related primarily with the aviation safety. Firstly, the full-scaled shape of Boeing 777-200 is modeled according to the lost MH370 aircraft on 8th March. And then an Arbitrary Lagrange-Euler (ALE) fluid-field model is created for water and air domain. Next some simulation cases are implemented related to different vertical velocities using LS-DYNA nonlinear finite-element code, with the same horizontal velocity and attack angle. At the same time, the variations of the velocity of the head and tail are discussed. Consequently, Ditching overload peak occurs at the highest vertical velocity. The simulation results can deeply be applied to accident analysis of aircraft impacting on water.
Research on Electrical Discharge Grinding of Polycrystalline Cubic Boron Nitride Cutting Tool
Authors: Jia Yun Hai , Guan Cheng Zhe
Published: October 2014

Electrical discharge grinding is part of the most widely used methods to machine polycrystalline cubic boron nitride cutting tool. Polycrystalline cubic boron nitride compact samples processed in domestic with different grain size are the research object. Electrode running speed, peak current, and pulse width are selected as the main process parameters. The material removal volume and electrode loss set as the evaluation index of productive efficiency; workpiece surface roughness value sets as an evaluation standard of processing quality. Through electrical discharge grinding experiments, combined with scanning electron microscopy observation, energy spectrum analyzer and roughness tester, the influences of the main process parameters on electrical discharge grinding are analyzed, polycrystalline cubic boron nitride compact electrical discharge grinding technics & mechanism are summarized.
The Application of Radial Basis Function Neural Network in Springback Prediction of Sheet Flanging
Authors: Han Li Fen , Liao Zi Long
Published: October 2014

Based on the convex (concave) arc sheet flanging experiment data, the springback prediction research in the sheet flanging was carried out, using radial basis function (RBF) neural network (NN) and the dynamic structure design method. By comparing with the experiment results, the validity of this method was verified.
Research and Design of Permanent Magnet Synchronous Motor Vector Control for Electric Vehicle
Authors: Huang Zhi Yu , Chen Jun Bing
Published: October 2014

As the electric vehicles usually run under complex conditions of city road, there always exists parameter perturbation of motor, which will affect the vehicle performance. To solve the problem, an improved sliding mode variable structure control (SMC) method which combines continuous function and reaching law has been proposed in this paper. Then the improved vector control algorithm’s codes are generated automatically in the MMC (Model-based Motor Control) platform. The results show that the improved SMC algorithm has small chattering and strong robustness to the parameter perturbation and the external disturbances.
Research on Genetic Algorithm-Based Solution Method for Variable Cycle Engine Model
Authors: Wu Zheng Jia , Meng Rong Hua , Li Ji
Published: October 2014

Variable cycle engine is a complex system, which is usually mathematically modeled as a series of multi-dimensional nonlinear implicit equations. Processes for solution of these equations are often complicated; therefore, a genetic algorithm-based method was presented in this paper for the solution of the mathematical model. The method was also evaluated by such parameters as initial value sensitivity, computation efficiency, convergence and stability; and compared with Newton-Raphson method. It shows that genetic algorithm-based method is less sensitive to initial values, more capable in convergent and computing stability than Newton-Raphson method, however more time consuming.
Analysis and Application of Turbine Outages Kept Boiler of FCB Function in the Philippines Mariveles Power Plant
Authors: Fang Guo Cheng , She Shi Da , Ye Zhen Qi , Zhang Ji , Wei Lai , Wang Qiang , Zhang Xiang Qun , Ding Yong Yun
Published: October 2014

This paper mainly introduces the system configuration of the Philippines Mariveles power plant, the difficulty and key points of the unit fast cut load (Fast Cut Back - FCB) control function were analyzed, and the boiler pressure control valve (Pressure Controlling Valve - PCV) discharge, turbine bypass opening coordination decrease pressure, integrate the override control, a fixed value servo and other control strategy, the possible problems in the process of test are sorting and analysis, and put forward effective solution, ensure the successful application of turbine outages kept boiler of FCB function, lay solid foundation for the safe and stable operation of the power grid.
Implementation and Optimization of Transmission Line 3d Scene Based on VR
Authors: Sun Feng Jie , Liu Hui Juan , Chen He
Published: October 2014

This paper describes the influences of transmission line on the safety and reliability of grid, and illustrates the necessary of visual management of transmission lines. Virtual 3d scene modeling method is introduced in detail, including Virtual 3d scene modeling and virtual 3d entity modeling. According to the characteristics of transmission line, the 3d scene of transmission line ia designed and implemented. At last, Virtual reality modeling language (VRML) is used to complete the optimization of the established model and the experimental results show that the data size of the optimized model has reduced considerably.
Requirements for the Excitation System in the Development of Units and Grid Coordination
Authors: Wen Yi Yu , Huang Miao , Liu Guo Ping , Liu Yu Ming , Zhao Ke
Published: October 2014

The concept of Units and Grid Coordination (UGC) is introduced. Problems about UGC are drawn from some power interruptions. Some attentive issues are present in excitation selection and design in future power system such as reliable operation of PSS, coordination between excitation limiters and protections, operation mode of excitation control in running stage. Special attention should be paid to the selection of excitation type, parameters design of 1000MW class generator unit in planning stage.
Application of Embedded Technology in Transient Electromagnetic Receiver
Authors: Liu Wei
Published: October 2014

The transient electromagnetic method (TEM), which is also called time domain electromagnetic method, is one of the common methods of geophysical disciplines of electrical prospecting. This paper, based on theory of the TEM, analysed the application of the embedded technology in TEM, and completed the design of the transient electromagnetic receiver system. The ARM processor is the core part of the system, combined with high precision A/D conversion chip, CPLD module, PC104 and other hardware parts.Through repeated field actual tests, the system works stably and reliably and data acquisition result is favourable.
Dependence of the Breakdown Voltage of 4H-SiC MESFET’s on the Field Plate and Step-Channel
Authors: Zhang Xian Jun , You Na
Published: October 2014

The breakdown mechanism of the 4H-SiC metal-semiconductor field effect transistor (4H-SiC MESFET) at a large drain bias is explored and the dependence of breakdown voltage on the field-plate and the step-channel is investigated by simulation. The results revealed that the breakdown occurs at the corner of the gate near to the drain. The channel step and the field-plate length have sensitive effect on the breakdown voltage. The breakdown characteristics are improved since the electric field peak is lowered at breakdown point in the step-channel and field-plate structures. The largest breakdown voltage can be achieved by optimizing the field-plate length.
Design and Application of a Low Frequency VCO
Authors: Zhang Hui Min , Wu Qing Ping , Zhou Zheng Yuan , Wang Xun
Published: October 2014

The low frequency voltage controlled oscillator (VCO) is designed using integrated operational amplifier. The frequency of the output signal of VCO changes with the magnitude of the input signal voltage, and show a linear relationship within a certain range through the experimental test. Experiments show that, under the input of certain amplitude and frequency range of the square wave, triangle wave, saw-tooth wave, the output waveform of VCO respectively is ambulance, fire siren and other kinds of ambulance siren Signal. This innovative design’ cost is low, realized by analog circuit. It can be used in the practice of teaching case, electronic production or development of sound panels.
Design and Implementation of a New Drive Circuit of Monolithic Emitter-Switching Bipolar Transistor (ESBT)
Authors: Lin De Hui , Lou Ping , Lin Hui Pin
Published: October 2014

This paper introduces a kind of monolithic emitter switched bipolar transistor (ESBT) for three-phase rectifier applications and other high voltage applications. This paper proposes an improved driving circuit, combining the soft switch circuit. We made a flyback circuit prototype which the rated power is 80W, and the maximum input voltage is 800V, and compared with the existing driving circuit.
The Analysis for Crystallization of Sn-Pb Alloys Using Acoustic Emission Testing about Wind Turbine Root Materials
Authors: Qin Hong Wu , Xing Xiao Xue , Zhang Xian
Published: October 2014

Regular researches of system Sn-Pb alloys with use AE are carried out in various crystallization conditions. In the given researches the technique has been used, which allow to divide the signals radiated with plastic deformation and crack's formation and development from each process. In the metals and alloys majority radiation of AE signals begins in the middle of crystallization's area and comes to an end at the moment of the crystallization termination However in a number of materials AE signals have been registered below an excess point on a cooling curve in a firm condition. Essential influence of small impurity on AE feature and is revealed at crystallization AE character with crystallization of pure metals is defined by a kind of a crystal lattice. Linear dependence total AE from cooling rate is established Influence of superfluous and low residual pressure on AE character established with crystallization.
The Original Carbon-Copper Compound as a New Source of Electric Power
Authors: Kong Ling Bo , Xing Xiao Xue , Zhang Xian
Published: October 2014

The original method of electrochemical sedimentation of ultra-dispersed graphitefrom the colloid mixture on the polystalline copper cathode is designed.An interfacetransition region of several microns thickness is formed. Formation of electric potentialbetween the copper substrate and the graphite layer is observed. A mechanism of this effect is studied using the computer quantum mechanics simulation. A high level of precision cannot be maintained over large areas, so that large-area devices are currently difficult to fabricate. By contrast, we have noted that the dielectric elastomer actuators themselves set the gap, so that the gap can be formed in only a single step, film deposition on a flat surface. By using monolithic polymer substrates, one should be able to make large-area arrays of dielectric elastomer actuators.
A Token Oriented Measurement Method of Source Code Similarity
Authors: Zhu Hong Mei , Zhang Liang , Sun Wei , Sun Yong Xiang
Published: October 2014

In order to help teachers to identify plagiarism in student assignment submissions among students’ Source code quickly and accurately, this paper discusses a measurement method of Source code similarity. In the proposed algorithm, firstly, both of token oriented edit distance (TD) and token oriented length of longest common subsequence (TLCSLen) is calculated; secondly, considering the TD and TLCSLen, a similarity calculation formula is given to measure similarity of Source code; Thirdly, a dynamic and variable similarity threshold is set to determine whether there is plagiarism between Source codes, which ensure a relatively reasonable judgment of plagiarism. This method has been applied to the university's programming course work online submission system and online examination system. Practical application results show that this method can identify similar Source code timely, effectively and accurately.
Current Detection Method and its Application of an Extension pq Theory
Authors: Wei Tian Cai , Tao Shun , Su Bin , Luo Chao
Published: October 2014

In the modern society, with the rapid development of industrial technology and information industry, electrical loads become more and more complex. As a result, the harmonics and reactive power problems have become increasingly serious. In the non-sinusoidal conditions, conventional power definitions don’t work well any more. Power theory is one of the foundations of financial accounts for energy, evaluation of the efficiency of power transmission and control of current compensation. Among them, the instantaneous reactive power theory is regarded as one of the most promising power theories. What’s more, it has been improved. Based on the three-phase three-wire system and four kinds of different supply voltage conditions, this paper compares the instantaneous reactive power theory (pq theory) with the extension pq theory. At last, the simulation results are presented. As a conclusion, the extension pq theory is the improvement of the pq theory and has a wider applicability.
Thermal Reaction Kinetics of Fly Ash Cement Paste at the Age of 28 Days
Authors: He Xiao Fang , Miao Chang Wen , Wu Yong Hao , Cao Xin Xin , Liu Dan
Published: October 2014

The thermal reaction kinetics of fly ash cement pastes were studied by Differential Scanning Calorimetry (DSC) and Thermal Gravity Analysis-Differential Thermal Gravity (TG-DTG) method, the kinetics parameters such as apparent activation energy was calculated by the Kissinger method, and the physical parameters were obtained. The result show that the fly ash cement pastes performance three endothermic reaction stages at different heating rates, peak temperatures of each stage at the range of 91.85~121.08°C, 453.93~496.48°C, and 680.21~751.62°C. TG-DTG show there were three thermal decomposition stages, thermal dehydration reaction apparent activation energy of fly ash cement pastes in each stage were 47.23kJ/mol, 128.84kJ/mol, and 134.07kJ/mol.
Design and Implementation of Digital Piezoelectric Constant Testing System
Authors: Dong Bi Zheng , Li Deng Hua
Published: October 2014

Digital piezoelectric constant testing system was designed in this paper, which was based on hydrostatic test method. The system is composed of hydrostatic device, charge amplifier circuit, peak holding circuit, A/D calibration circuit, data processing by DSP. Pressure-release value is obtained by digital pressure transmitter on the hydrostatic device. Combining with mean filtering and A/D calibration, DSP can sample accurate voltage signal. Considering the difference between the equivalent circuit of charge amplifier and its practical circuit, the calculated hydrostatic piezoelectric constant is in better agreement with the theoretical value. The experiment results show that the accuracy of testing system is less than 4%.
E-Bike Head-Lamp Failure Analysis Based-On Failure Anticipation Analysis
Authors: Wang Li Xin , Qiu Wen Ge
Published: October 2014

A failure analytical tool, Failure Anticipation Analysis (FAA) of modern TRIZ, is briefly described in this paper. FAA algorithm is put forward, and employed to solve a failure problem of E-bike lighting system in the Case study. The practice shows the power and efficiency of FAA.
Transformer Bushing Online Monitoring Method Based on the Method of Relative Angle Difference
Authors: Gao Qiang , Yuan Feng , Guo Zhan Nan , Liu Qi , Zhong Dan Tian , Wang Mao Jun , Li Ping , Cai Bin , Li Zai Lin , Yuan Ting , Zhang Jing
Published: October 2014

Transformer is the main equipment of power system, its operation reliability is directly related to power system security and reliability of power supply. In order to guarantee the safe operation of power system, must strengthen the monitoring of the main transformer.With the development and popularization of intelligent station, the detection of transformers insulation is faced with the new problem that PT signal is not convenient to get and even unable to get. This paper proposes the relative method which is used to calculate and monitor dielectric loss of transformer bushing and designs the on-line monitoring device, through the data acquiring form the on-line monitoring instrument which are installed in the transformer of substation shows that this method has high precision, strong anti-interference ability.
Analysis and Modeling of Uncertain System in Complex Environment
Authors: Li Jun Hua , Quan Hong Wei , Zhang Xiao Juan
Published: October 2014

In complex battlefield environment all kinds of the uncertainties for target tracking make the analysis and modeling of tracking system irresolvable. Aiming at different levels of system uncertainty, the correspondent modeling methods are introduced. First, the stochastic process model is investigated which includes target process equation and sensor measurement equation. Second, joint state-class probabilistic density is given for realizing target tracking and classification simultaneously. Finally, the joint target detection, tracking and identification based on finite-set statistics theory is represented for multi-sensor multi-target tracking.
Thermal Control Design for the Combination of Star Sensor Using C-C Graphite Material
Authors: Xu Zhi Ming , Li Ming , Chang Xin Ya
Published: October 2014

To solve the problem that thermal control design of the combination of star sensor is high requirement and difficult to implement, the thermal control design of the combination of star sensor using C-C graphite material was proposed in this paper. By taking some combination of star sensor requiring difference in temperature on bracket of star sensor less than 4.5°C and temperature of flange of star sensor in 8.5±2°C as an example. Thermal analysis was achieved to validate the thermal control design scheme proposed in the paper. Analysis results show that the thermal control design scheme can make difference in temperature of bracket of star sensor in orbit less than 2.73°C, and flange of star sensor in orbit between 7.47°C and 8.93°C,which meet the temperature requirement very well. The design scheme is reasonable.