bluuebunny/crossref_metadata_2025 huggingface dataset:
Study on the Screw Rotor Profile of Non-Leakage Dry Screw Vacuum Pump
Authors: Wu Xiu Hai , Chen Wen Hua
Published: June 2013

Through mathematical derivation based on screw engagement theory, the complete equations of the rotor profile with single thread, fixed pitch screws, trapezium and concave tooth surface were given. The end face profile of the pair screw rotor is conjugate and identical. The pair screw rotor form a meshing relationship by left hand and right hand. Finally, through modeling and simulation of meshing process by PRO/ENGINEER software, the profile equation is proved to be correct, the meshing line is completed, and operating the tooth surface interference does not occur in the course of meshing process.
Portable Measurement System Based on Raman Spectroscopy
Authors: Fan Xian Guang , Wang Xin , Wu Ding Gui , Zuo Yong
Published: June 2013

In this paper, the portable Raman spectroscopy measurement system is presented. The measurement system can detect the Raman spectrum of objects using the advanced technique called Shell-isolated Nanoparticle Enhanced Raman Spectroscopy (SHINERS). This technique used gold nanoparticles coated with a thin, uniform, fully enclosed and optically transparent shell of silica or alumina so that the gold core generates a large surface enhancement and the shell controls the distance of the core from the surface to be detected. Based on this technique, the measurement system is designed including three modules, optical module, mechanical module and electrical control module. This Raman spectroscopy measurement system is portable, and can be used to the inspection of food safety, drugs, explosives and environment pollutants.
Computed Order Tracking and its Application to NVH
Authors: Wu Xiao Bing
Published: June 2013

Analysis of vibration or acoustic signals from rotating machines is often preferred in terms of order spectra rather than frequency spectra. An order spectrum gives the amplitude and/or the phase of the signal as a function of harmonic order of the rotation frequency. Order tracking requires sampling of the vibration signal at constant angular increments and hence at a rate proportional to the shaft speed. Most commercial software for signal processing has the built-in capability of computed order tracking, such as the 7702 order tracking software of B&K Pulse. The order tracking result of interior noise of cab is presented in this paper. From order tracking analysis on the noise of interior cab, we found that the noise mainly comes from the second order excitation of engine, and that the overall noise with respect to engine speed
Optimal Sensor Placement Method for Gantry Crane SHM System
Authors: Huang Guo Jian , Wang Dong Hui , Wang Xin Hua , Wang Wei Wei
Published: June 2013

The choice of the number and location of sensors in the structure is the foundation of cranes structural health monitoring, which has major influence on the monitoring results. This paper taking a gantry crane as a SHM research object, uses optimal sensor placement based on Finite Element Method, the stress concentration points could be drawn by the FEM calculation results. This method carry out dynamic load stress analysis for the structure with virtual prototype, which make up for the lack of static analysis; compared with the type test methods, not only reduce the test cost, but also more flexible, and break through the restrictions of all types of extreme conditions. This method makes the sensor data obtained more realistically reflects the crane structure condition; provides reliable data support for crane safety monitoring and safety evaluation. The promotion of this method will provide important technical support for the development of the crane SHM.
The Analysis of the Critical Speed of Ultra High Speed High Temperature Abrasion Tester
Authors: Sun Jian Gang , Li Tie Jun , Ren Xian Jing , Liang Shu Yan , Mao Guo Wei
Published: June 2013

In order to make the actual work speed avoid critical speed of the ultra-high speed high temperature abrasion tester, and ensure the smooth running of the tester. Through the establishment of the physical model of testing machine, by using transfer matrix method and matlab software, all order critical speed of the tester is concluded.
Ventricular Tachycardia and Ventricular Fibrillation Analysis Based on Jensen-Shannon Divergence Analysis
Authors: Zheng Zheng Zhong , Zhao Jun Chang , Wang Jun
Published: June 2013

t is an important method for using electrocardiogram (ECG) to detect and diagnose heart function in clinical practice of medicine. Ventricular tachycardia (VT) and ventricular fibrillation (VF) are serious threats for peoples lives, they often bring about cardiac sudden death. In this paper, the complexity analysis method based on Jensen-Shannon Divergence was used to calculate the complexity of the normal sinus rhythm signals, VT, VF. The study found that the VF was highest, followed by that of VT, and that of normal sinus rhythm signals was minimum. The result can be used to assisted clinical diagnosis.
Epilepsy Abnomal Electroencephalagram Analysis Based on Symbolic Relative Entropy
Authors: Zhang Mei , Zhao Jun Chang , Zheng Zheng Zhong , Dai Jia Fei , Wang Jun
Published: June 2013

In this paper, symbolic relative entropy was used to analyze the average energy dissipation of epilepsy electroencephalagram (EEG) signals and normal electroencephalagram signals. Hypothesis testing showed that the average energy dissipation of epilepsy electroencephalagram signals was distinctly higher than that of normal electroencephalagram signals. It discoved that symbolic relative entropy can be used to analyze the irreversibility of time series and to assess the health state of human brain. It can be used to assisted clinical diagnosis.
An Improved Weighted Average Method for Test Data Analysis of Electronic Components
Authors: Zhang Fei Fei , Li Zhi Gang , Yao Fang
Published: June 2013

Electronic components are the basis of electronic equipment, and their reliability and lifetime have a direct impact on the work efficiency of the whole electric system. In fact, the test data on life characteristic parameters (LCP) of electronic components present random fluctuations because of the existence of some disturbing factors in the process of life test. This will bring great obstacles to the study on the rules of LCP, the reliability and life forecasting of electronic components. In order to solve these problems, this paper proposes a method of the determination of weight coefficients and an improved weighted average algorithm to reveal the rules of LCP. In the improved weighted average algorithm, the latest data is constantly introduced while the oldest data is removed. By an example of contact bounce time on electromagnetic relay, the application verification has been carried out on the above-stated method in the paper. The results show that the method is effective and feasible.
Detecting Distance Emulation of Millimeter-Wave Detector
Authors: Jia Qiu Rui , Sun Yuan Yuan , Xiao Shu Chen , Zhong Yong Bing
Published: June 2013

The detecting distance is an important index, which is determined by many parameters. In the paper, the detecting distance is analyzed in the view of system, the detecting distance is simulated according to technical index of each part, and we can also calculate sending power of oscillator needed by detecting distance required.
The Optimal Design and Controlled Strategy of the Planetary Gearing Powertrain Coupling System with Few-Tooth-Difference in Electric and HEV for All-Terrain Vehicles
Authors: Wang Yong Bin , Shi Yi Ping
Published: June 2013

The research combines the scientific research reality, which meets to the characteristic and environment request of all-terrain vehicles (ATV). According to the principle of component lectotype for Powertrain Coupling system of HEV, and the demands of performance parameter of ATV about power, torque and speed when ATV is under movement condition, this research is focus on the powertrain coupling system between engine electric motor and wheel which has carried on the optimized matching, the modeling simulation and the experiment. The article has determined one kind of new multipurpose design and development plan on the powertrain coupling system in electric and HEV for ATV. It focal introduces the new powertrain coupling system based on the Cycloidal Planetary gearing transmission with Few-tooth-difference (CPF), which have applied in powertrain coupling system of the multipurpose light electric and HEV for ATV. To provide the control strategy of clutches-brakes and brakes system with electromagnetic controlled in the CPF for developing controllers for motor, engine and central controller for E & HEVs ATV power distribution. The findings indicated, the powertrain coupling system designs might satisfy the performance requirement for entire vehicle in wild beach. The method and the obtained result provided basis design theory for ATV and multipurpose light electric and HEVs. The technology has applied to ATV in Ningbo Saiting Electric Bicycle Science & Technology CO., LTD, and has applied patent.
The Complexity Evaluation Method of Electromagnetic Environment Based on Statistical Characteristics Analysis
Authors: Wang Fan , Han Hui , Wang Jian , Liu Ya Nan
Published: June 2013

An objective complexity evaluation method of electromagnetic environment is presented based on statistical characteristics analysis. In order to quantize variation characteristics and statistical law of electromagnetic environment, evaluation factors are introduced such as relative variation, average variational ratio, maximum variational ratio, standard deviation and skewness of power spectral density. Besides, evaluation factors such as time occupancy, spectrum occupancy, space occupancy and Average energy value are utilized to conduct the objective evaluation comprehensively and accurately in time, frequency, space and energy domains. The practicability of this method is validated by monitoring data. Results show that this method can effectively evaluate the complexity of electromagnetic environment.
Smart Device Application Development for Remotely Monitoring Green · Leisure Vessels
Authors: Park Jong An , Kang Seong Kwan , Kim Yong Su , Seo Jang Won , Lee Ji Min , An Young Eun
Published: June 2013

Has been actively studied for vessels monitoring system, but most of that is aligned with the large vessels. In recent years, with the growth of the marine leisure industry, there is a growing demand for vessel monitoring and providing information system of small and medium-sized vessels such as greenleisure vessels. In this background, this paper was designed the remote monitoring system showing through smart terminals in remote data has been transferred from the 60ft green leisure vessels. These system will be able to create a demand for green leisure vessels by interconnecting the integration operated system of the green·leisure vessels.
Application of Linear Servo Motor in Biochip Microarray Instrument
Authors: Liu Quan , Liu Qiao Qiao , Wang Xiao Fei , Zhao Xue
Published: June 2013

A novel design to biochip microarray instrument is use of linear motors, in preference to conventional rotary motors driving ball screw. Three ironless core linear servo motors direct drive the X, Y and Z-axis motion, Improve performance such as superior positioning accuracy, high-speed operation and increased efficiency. The whole configuration for new microarray printing instrument is designed. Furthermore, the structure of special linear motors is also designed detailedly. And the linear servo motor automation control technology is introduced in this paper.
Locality Sensitive Hashing with Extended Partitioning Boundaries
Authors: Lee Keon Myung
Published: June 2013

Locality-sensitive hashing is a technique to allow approximate nearest search for large volume of data in a fast manner. Binary code locality-sensitive hashing distributes a data set into buckets labeled with binary code, where binary codes are determined by a set of hash functions. The binary hash codes play the role of partitioning the data space into subspaces. When close neighbors are placed around subspace boundaries, there are chances to fail in locating them. It requires to check neighboring buckets while finding nearest ones. The paper presents a technique to enhance the search performance by introducing the notion of extended boundary. It reduces the potential misses and the search overhead especially for the regions located at the double-napped corners. Keywords: locality sensitive hashing, data search, hashing, data analysis
Study of Disturbances Model on Carrier-Based Aircraft Landing Process
Authors: Yin Hai Tao , Wang Xin Min , Li Wen Chao , Xie Rong
Published: June 2013

The disturbances in the landing process of carrier-based aircraft include deck movement and ship wake. To guarantee the security of landing process, the simulation and model are necessary for the disturbances, and the deck movement and ship wake should be analyzed as well. On the basis of analysis of disturbances, the disturbances can be catalogued into two types: deck movement and ship wake. Combining with the relevant instructions in the American Army Standard, the mathematical model of each disturbance is established. The simulations of the deck movement and ship wake are also shown in this paper, which can supply the reliable disturbances models for the design of the control system of carrier-aircraft landing process.
Dynamic Characteristics of Swing Check Valve Based on Dynamic Mesh and UDF
Authors: Li Shu Xun , Hou Ying Zhe , Li Lian Cui
Published: June 2013

In view of the transient dynamic analysis in opening swing check valve, the motion model of valve clack is built, two-dimensional dynamic numerical simulation of the internal unsteady flow is performed by using dynamic mesh and UDF in opening two kinds of swing check valve at the same working condition, the visualized results are obtained. The results show that internal flow field of the modified model become more stable, the noise, impact and the local energy loss are decreased, the service life is improved obviously; an important reference for swing check valve design and analysis of dynamic characteristics are provided by the research results.
Finite Element Modeling of Induction Heating on Easy-Open-End Dies
Authors: Li Gang , Chen Jian , Jin Li Qiu , Wang Wei , Hui Cai
Published: June 2013

Through the magnetic-thermal coupling of ANSYS, the finite element modeling (FEM) of induction heating of the easy-open-end die was completed and the distribution of the dies temperature was determined. Simulation results showed that the dies cylinder surface temperature was high and close to the center was low with a small difference in temperature of about 3°C. Both simulation and experiment results demonstrated the benefits of using induction heating which could guarantee rapid and even heating. This result meant that the dies height varies evenly and was easy to be controlled. The results supplied a strong theoretical foundation for the project of real-time control easy-open-ends notch height.
The Design and Simulation of Three-Phase PWM Converter
Authors: Liu Guang Ya , Li Xiao Song
Published: June 2013

Three-phase voltage source PWM rectifier generally adopts double closed loop control system. According to the high frequency characteristic of three-phase voltage source PWM rectifier, this paper put forward the setting method of current inner ring regulator and voltage outer ring regulator PI parameter. Finally, it is verified by simulation.
The Virtual Constraint Model and its Application to Tolerance Analysis
Authors: Bo Wang , Zheng Guo Lei , Duan Li Hua
Published: June 2013

The geometrical element chain method (GECM) is a tolerance analysis approach based on parametrical driving theory, with the principle of functional dimension driving being its key theore-tical basis. Currently, the functional dimension driving theory cannot cover the implicit constraints and the geometrical constraints in the 3D models, thus the application of GECM has been limited. To solve this problem, this paper presented the concept of virtual constraint model (VCM) of the pro-ducts 3D models, and constructed the algorithm of tolerance analysis oriented to VCMs to extend the application scope of GECM. Firstly, the mapping matrix between functional dimension set and the modeling parameter set was constructed, and a necessary and sufficient condition of the existence of the mapping relation was given. Secondly, the concept of VCM was put forward, and the tolerance analysis algorithm of the VCM was constructed. Finally, an example was given to illustrate the validity and effectiveness of the approach in this paper.
Design and Simulation for the Hydraulic System of a New-Style Monorail Crane Traction System
Authors: Zhang Jun , Cai Qing Yang , Zhao Xian Weng , Tang Chun Ren , Niu Meng Meng , Huo Jia Lin
Published: June 2013

In order to meet the requirement of the underground cable checked, the hydraulic system of a new-style monorail crane traction system is introduced. The hydraulic system of the traction system was designed. The modeling and simulation for the hydraulic system was build, and the simulation results were analyzed subsequently. The research shows the system performance reaches the requirements. The simulation results are almost the same as the theoretical value, and the design scheme of the hydraulic system is feasible.
Traffic Signs Recognition Based on Affine Invariant Hu's Moment Features
Authors: Liu Min , Mao Jian Xu
Published: June 2013

Traffic signs effected by shooting environment and natural environment , and varying degrees of geometric distortion. This work introduced a new method to extract the traffic signs' Hu moment features that based on affine invariant. First , according to the shape coordinates x,y of traffic sign is independent of each other before affine transformation . Then getting traffic signs only have rotating effect by ICA transformation . Finally , recognizing traffic sign by compare the Hu's moment feature. Results show this method can greatly improve the feature extraction accuracy of Hu moments and traffic sign recognition efficiency
Graphic Simulation Analysis on Light Pollution from Glass Curtain Wall and Optimization
Authors: Zhu Ming Ye , Wang Jin Ping
Published: June 2013

The developing economy and convenience of traffic makes the building more and more large, and the traffic is also increasing quickly. The light pollution caused by glass curtain walls in high-rise building makes the traffic safety problems more and more serious. Enough attention should be paid towards it. A simulation software was written in order to make a graphic simulation of the sun's running status, analysis of various types of architectural glass curtain wall and building orientation on light pollution regional distribution effect. It's summed up that the use of decumbent form glass curtain wall can be effective in controlling light pollution area size and can reduce the glare range by properly reversing buildings, in order to avoid light pollution’s influence on traffic safety.
Design of Wireless Video Surveillance System
Authors: Han Wei
Published: June 2013

Wireless video surveillance is of increasing importance. Many wireless video surveillance systems require a well optimized video codec for low-power operations. Compression of the captured video is normally needed in order to reduce the amount of video data to be delivered as well as to increase the video storage capability of the surveillance system. In this paper, a method which can greatly reduce the complexity for one of the most time-consuming parts in a video encoder was proposed.
Exploration on the Man-Machine Relationship in Digital Art
Authors: Du Wei Min , Gao Qian
Published: June 2013

As a unique combination of science and art, digital art is impacting on the traditional art form. Digital art is actively connected with popular culture and consuming culture by the use of television, computer, Internet and other means. Digital art also has a strong influence on public culture which is successfully avoided the defects such as personal privacy and narrow sense. Digital art is an art form which is built on some certain technology conditions. However, the artistic rules of digital art works should not be less than the technical rules. After all, artists should avoid changing and covering the shallow performance of the art concept by using the digital form of technology.
Natural Gesture Recognition Based on Motion Detection and Skin Color
Authors: Feng Kai Ping , Wan Ke , Luo Na
Published: June 2013

With the development of the Virtual Reality technology and the next Human-Machine Interaction technology, this paper focus on the object motion detection and object skin color analysis, provide one kind of hand gesture segmentation method based on one camera. This method capture the image from the single camera to detect the moving object by the time difference method and the Gaussian module method, tracking the hand motion region real time, then to segment the hand gesture using the specified region skin color features after the hand region is extracted. Using the motion detection and the skin color features both, to do static gesture recognition by the template match method after extracting the features of the static gesture contour.This experiment make clear that the segmentation has better effect and recognition result.
Design Method for Dynamic Map Symbols Based on RIA Environment
Authors: Cheng Qian Wen , Zhou Lei , Cheng Hong Hua
Published: June 2013

Although Geographic information system has just developed for decades, the course of its development is very rapid. The application and services of GIS technology have almost extended all the fields related to spatial information. Map, as the basis of GIS, its important position is self-evident. Map symbol is the language of the GIS map, which is the expression of the map content, the main medium of spatial-data information transferring, and an important feature differs from other images referring to the geographical environment. The function of Dynamic electronic map based on modern visualization tools, is far more superior to the traditional static map. Its expression is more rich and vivid, and introduces interactive operation into loading images, which enhanced the initiative and adaptability. The dynamic symbol is the basis of powerful visualization capabilities of dynamic map. With the support of the dynamic symbol, dynamic map is even more vivid and detailed. This paper is mainly about design method of dynamic map symbols based on rich Internet applications (Rich Internet Applications, abbreviation RIA). Take Flex as the case,which focus on the animation effect in Flex and achieves the dynamical substitution of point symbols on the map published by ArcGIS Server with ArcGIS API for Flex. Furthermore, look forward to the combined applications with web service.
Wireless Communication in Vehicle Intelligent Network System
Authors: Chen Ying Xue , Liu Zhi Gang
Published: June 2013

Modern cars are integrated with more and more electronic devices, controllers, sensors, actuators, bring more convenience, comfort and safety to the driver. Therefore, complex functions have much higher requirement on communication network, with higher speed, so accelerate new type of vehicle network application, such as FlexRay, Ethernet, and etc. Wireless connection could provide a convenient and flexible topology, transport protocol solution, also could resolve vehicle electronic limit. This paper proposes vehicle network system architecture based on communication, including three types of wireless application on the network, covering three major direction, intelligent terminal connection, wireless diagnostic, telematics and some solutions on the key points specific. Description in the paper is already built to specification, and integrated in the test samples of the related electric control system on the demo car.
The Wireless Sensor Network Routing Algorithm Based on the Small World Model
Authors: Chen Li Qiang
Published: June 2013

Small-world networks have the higher clustering coefficient and shorter average path length. According to the design requirements of topology and routing algorithm of the WSN, we apply small world theory into the WSN, and propose the routing algorithm based on Newman Watts small-world network model. This algorithm judge the cluster number whether same to decide the communication type. Data is transmitted to super node firstly, and then the packets are sent by the shortest transmission paths which get from the super node ring. Experiments show that the routing algorithm improves the network throughput and network transmission efficiency, the common node energy consumption become small, so the service life of wireless sensor network is prolonged.
Fault Signal Adaptive Detection Research and Design with the High Noisy Environment
Authors: Xu Wei , Wang Zhong Ce
Published: June 2013

National safe production guarantee is one of kernel on troubling area of production, power system is a critical field too, since its higher requirement on electric supply and potential dangerousness.It has an important significance how to find potential faults as soon as possible for production and lifes security, the research of fault adaptive detection system based on higher noisy environment is a method improving the condition in this field. This paper indicates the effectiveness of this algorithm through discusing its realization procedure and simulation practice effect. The traditional cepstrum analysis is based on FFT, this algorithm improves it through getting inversion about CZT, fault characteristic curves is good at stability and reliability, it is a bright spot of this paper.
Research on the Virtual Assembly-Disassembly and Electrical Control Process of AC Contactor Based on 3DVIA Composer
Authors: Deng Wei Gang , Li Hai Jun
Published: June 2013

The article made a research on the CJT1-10 AC Contactor, established its three-dimensional model in SolidWorks software, using Bottom-Up and Top-Down design method, and virtually simulated the assembly, disassembly and electrical control process in 3DVIA Composer software. A dedicated virtual simulation platform for AC Contactor was developed, and the simulation process was controlled individually by the program code. The virtual simulation platform effectively reproduced the assembly-disassembly and electrical control process of AC Contactor, which provided a good technical documentation for the production practice and teaching application.
The Reliability Design of Automatic Open-Parachute-Device
Authors: Wang Yuan Sheng , Lu Gui Ying , Li Bo , Yu Juan
Published: June 2013

Automatic open-parachute-device is an essential device in the field of aviation life-saving technology. In this paper, on the basic of the open-parachute-device mechanism, structure of its reliability function is given. According to its reliability indicators, considering the main failure mode and combining with similar products' reliability statistical data, analysis and design of reliability indicators are processed. Successively according to the principle of "redistribution method" and the principle of "proportional distribution method" about failure rate, the reliability indicators are calculated in detail. The results showed that the reliability indicators allocation with the "proportional distribution method" is little different from the reliability indicators allocation with the "redistribution method", but the former is more in line with the requirements. This design has a guiding significance to the product production.
Temperature Control System Based on Intelligent Electronic Boiler
Authors: Xu Guo Sheng
Published: June 2013

The electric boiler in use at present has a significant system inertia and a serious time-lag at the same time the difficulty of building the mathematical model. We often use PID algorithm of integral separation to improve the system. In this thesis, we put forward another PID algorithm of alteration in rate and take the example of the temperature control system of electric boiler. Then we use digital simulation of control system based on MATLAB to The method of fuzzy PID control is a ideal method.
The Design of Temperature Control Base on Fuzzy Control
Authors: Xu Guo Sheng
Published: June 2013

The electric boiler in use at present has a significant system inertia and a serious time-lag at the same time the difficulty of building the mathematical model. So it comes to a new method of combining them together. The parameters of Kp, Ki and Kd are adjust by fuzzy inference. Experimental results illustrate that the fuzzy PID parameters controller achieved the system performance index. The method of fuzzy PID control is a ideal method. The results show that the new controller is reliable, and shortens the time and volume of adjustment.
Research on Temperature Control System Based on Intelligent Electronic Boiler
Authors: Xu Guo Sheng
Published: June 2013

The electric boiler in use at present has a significant system inertia and a serious time-lag at the same time the difficulty of building the mathematical model. In this paper, a study based on the electric boiler is presented to meet the demands of stable system, shorter regulating time and a small overshoot. When fuzzy control is used, regulating time and overshoot always can achieves the specification, but system cause steady-state error. So it comes to a new method of combining them together. The parameters of Kp, Ki and Kd are adjust by fuzzy inference. Experimental results illustrate that the fuzzy PID parameters controller achieved the system performance index. The method of fuzzy PID control is a ideal method.
Modeling of Heat Network Heating Process
Authors: Li Qi , Li Mei
Published: June 2013

District heating process is a complicated dynamic and thermal nonlinear system. For controlling it the system model should be found firstly. Through the research and analysis of the knowledge about heating system, this paper on the basis of mechanism model, researched the establishment of experimental models. Firstly by measuring the response data, the model parameter identification of the heating process can be made to got the heating determining part model, then random part of the system model can be described by the method of Autoregressive Integrated Moving Average Model. Finally using the MATLAB to simulate and make the model step response curve analysis. Simulation results show the model is effective and verified.
Stability Analysis of the Scour Protection Structure for a Debarking Pipeline
Authors: Liu Wen Bin , Liu Run , Yan Shu Wang , Huo Zhi Liang
Published: June 2013

The debarking location of a gas pipeline is at the area where typhoons take place frequently and the geotechnical condition of the slope is very complex. A sloping breakwater type structure is selected in this paper for the purpose of pipeline scour protection. Since part of the sloping foundation soil consists of silty clay whose strength is very low, the bearing capacity is checked with the base pressure induced by the breakwater. The stability of the foundation of the breakwater is analyzed with the method developed by Meyerhof. The scour protection structure is proved effective and stable.
New Strategies for Improvement of Structural Gas Turbine Engine Parts
Authors: Uzunonat Yağız , Üzgür Sinem , Kushan M.C.
Published: June 2013

In this study, the basic limitations of superalloys in high temperature performances will be explained and then after giving the important properties of MoSi2 such as oxidation behaviour at relatively low temperatures (500°C-700°C) , some interesting composites of this material will be discussed as a candidate structural material in gas turbine engines.
Determining the Position of Cutting Tool in Drilling for Analysis of Mechanical Actions
Authors: Olteanu Elena Luminiţa , Laheurte Raynald , Darnis Philippe , Bîşu Claudiu Florinel
Published: June 2013

The mechanical actions measurement can highlight a series of mechanical phenomena occurring in the cutting process. During the experiments, we use a six-component dynamometer to measured the forces and the moments applied by the tool to the workpiece. In this paper, the authors present a method for determining the cutting tool position in drilling process, with purpose to transport of the moments (calculation of the torsor in each of the holes). Then can be achieved analyze of the forces and moments for every hole.
Determination of the Real Cutting Edge Wear Contact Area on the Tool-Workpiece Interface in the Light of Cutting Forces Variations
Authors: Oraby Samy E.
Published: June 2013

The determination of actual stresses over the tool-workpiece interface has long been a matter of debate among researchers. Evaluation of the nature and the geometry of the wear contact area were always associated with many, sometime impractical, assumptions. The indeterministic fashion of edge wear and deformation requires a more realistic way to predict the actual wear contact area. In the current study, many wear area patterns are proposed considering the different wear modes of the cutting edge. The selection of the most correlated pattern to a specific edge deformation is justified using the relevant variations in the radial and the axial force components. For a regular wear over the entire cutting edge, a wear pattern that considers nose and/or flank is justified. When the cutting edge plastically fails, a pattern that considers only nose wear is preferred. As the cutting edge is subjected to many types of irregular disturbances of edge fracture and chipping, a wear pattern considering both flank and nose wear is selected.
Harmonic Analysis Method Based on Power Balance
Authors: Huang Bing Hua , Yang Guang Song , Wei Ya Fen , Huang Ying
Published: June 2013

Nonlinear differential equations are sometimes found by using harmonic balance principle. If it is based on the complex power balance theory, some much more correct and rational results can be obtained. Non-autonomous circuits sometimes include two components, the forced and the self-excited oscillation, they must satisfy respectively the balancing condition of complex power. When we study the nonautonomous circuit, two notable questions should be considered. On the one hand ,the existence of self-excited oscillation of the circuit which contains the dissipative elements depends on whether or not active power can maintain balance. The existence is closely related to the amplitude of excited current source. When the current source is strong enough, the original self-excited oscillation will thus disappear, leaving only a forced component. On the other hand, the existence of the self-oscillation of the lossless circuit which does not contain the dissipative elements is independent from the current amplitude of the excited source. The forced and self-excited oscillation components can simultaneously coexist unconditionally. chaos can easy be produced by the nonlinear coupling of the two harmonic components. The intrinsic attributes of the chaos can be sufficiently revealed with the help of this kind of lossless circuits.
The Location Algorithm Based on Square-Root Cubature Kalman Filter
Authors: Liu Ying , Su Jun Feng , Zhu Ming Qiang
Published: June 2013

When wireless signal is used for indoor localization, there is no consistent relationship between signal strength received by the receiving nodes and distance from the receiving nodes to the receiving nodes, so there is a larger localization error for the Received Signal Strength Indication (RSSI) in the indoor environment. A new received signal strength indicator parameter estimation algorithm based on square-root cubature kalman filter is proposed in this paper, this algorithm utilizes Square-root Cubature Kalman filter (SCKF) to estimate the target’s position and the RSSI channel attenuation parameter simultaneously. The experimental results demonstrate that there is a better accuracy for the algorithm based on SCKF than the traditional method.
The Implementation of Information Receiving and Sharing of Satellite Cloud Image under the Complex Electromagnetic Environment
Authors: Yang Zhong Jiang , Liu Ming Ming , Yang Tian Qi
Published: June 2013

Take the electromagnetic test of WT-8D satellite cloud image receiving system at a meteorological satellite ground station as an example, the test philosophy is analyzed, the test arrangement is made, and the maximum permissible value of level interference under the test requirements is calculated. By comparing the measuring data and the maximum permissible value of level interference, the relations between the antenna frequency and the value of level, the location of interference source, the intensity of interference source, and the generation laws of interference are all grasped. Aiming at the interference source, two methods are proposed respectively in this paper to inhibit the interference, one in the frequency domain and the other in the spatial domain. Then the method of information sharing of meteorological satellite cloud image is analyzed and discussed. As a conclusion, the receiving and transmittal quality of the meteorological satellite cloud image are improved, to prepare for the anti-electromagnetic interference in high tech local area in the future.
Rapid Search Algorithms of Local Registering Based on Decimal Tree
Authors: Xia Zhen Hua
Published: June 2013

In order to overcome the low efficiency of the database-based algorithm and the string-matching based algorithm in searching phone number, the two-level search algorithm by combining a decimal tree with a local registering table is proposed in this paper. The algorithm implementation is introduced in detail, and the experiments show that the decimal tree based algorithm is faster than the database-based algorithm and the string-matching based algorithm, especially much faster in the case of huge traffic.
Predicting RNA Secondary Structure Using a Improved BPSO Based on Stem Combination
Authors: Qi Yi
Published: June 2013

In this paper, we present an improved BPSO to predict RNA secondary structure to improve the performance with two new strategies. First one is to reduce the searching space of PSO through super stem set construction. Second is to modify the general BPSO updating process to settle stem permutation and combination problems. The experimental results show that the new method is effective for RNA structure prediction in terms of sensitivity and specificity by different sequence datasets including simple pseudoknot.
Feature Extraction Algorithm for Palm Bio-Impedance Spectroscopy Based on Wavelet Transform
Authors: Lü Lin Tao , Zhou Xin Jun , Yang Yu Xiang , Tan Fang
Published: June 2013

Based on the palm bio-impedance spectroscopy (BIS) features, this paper suggests a kind of feature extraction algorithm suitable for the palm BIS. The palm BIS under the multi-frequency is measured , a wavelet transform with the characteristics of multi-resolution analysis is selected; each set of palm BIS data is discomposed ; the feature subset of wavelet coefficients with the different dimensions is extracted ;and then the support vector machine is used to carry out the matching judgment . The testing results indicate that the correct rate of the palm BIS feature extraction algorithm based on the wavelet transform is 91%, and its error rate is 9% ,whereby testifying that this algorithm is of an excellent robustness.
Research on User Classification Based on Usability Tests of General-Purpose Emergency Maintenance Vehicle User Models
Authors: Liu Ning , Wu Lei Ming , Shi Hong Xia
Published: June 2013

In the ZB General-purpose Emergency Maintenance Vehicle usability testing, in order to find out the proper selection of test user types, and the best combination of user classification, the author classified the usability testing results by cause, and analyzed the data statistically. Then this paper draws a series of conclusions, and finally draws the theoretically optimal combination of user classification. No experience can be used for reference or comparison in the choice of test samples, so the results can be used as reference and data accumulation for further research.
Formability Studies of Friction Stir Processed Mg AZ31 Alloy in Plane-Strain Stretch Forming
Authors: Tagore G.R.N. , Venkateswarlu G. , Davidson M.J.
Published: June 2013

Magnesium alloys exhibit poor formability at room temperature because of their hexagonal close packed (hcp) structure. The grain refinement can improve its ductility and formability. Friction stir processing (FSP) is an emerging solid state surface modification technique that can produce homogeneous microstructure with fine-grains in a single pass. The effect of friction stir processing variables that can affect tensile strength and formability of magnesium AZ 31B alloy are studied. The formability of friction stir processed sheet was studied by limiting dome height (LDH) test in plane-strain deformation condition. The results indicate that the tensile properties and formability are improved by friction stir processing. The objective of the present work is to establish randomisation of texture to increase work hardening exponent by favourably orienting a large number of grains (texture) in AZ31 alloy to improve its stretch formability by promoting additional straining in thickness direction.
Keywords: Friction stir processing, LDH, Formability, etc.
Rough Clustering Method Based on Particle Swarm Optimization Algorithm
Authors: Wang Chao , Luo Ke
Published: June 2013

As a relatively novel clustering approach, Particle Swarm Optimization (PSO) prevents k-means algorithm from falling into local optimum effectively, and has made relatively notable successes in clustering, however, using Hard C-Means algorithm when randomly obtaining initial clustering centers is required in most existing PSOs, while no definite limit existing in these samples actually. Based on this, we utilized an improved PSO; along with effective processing methods on boundary objects of Rough Set Theory, we proposed a new rough clustering algorithm based on PSO. It can adjust the upper and lower approximations weighting factors dynamically, and coordinate the proportions of upper and lower approximations in different generations as well. Finally, we compared it with several common clustering methods using Iris dataset of UCI. It turned out that the algorithm has higher accuracy and stability, along with better comprehensive performance.
A Speech Endpoint Detection Based on Empirical Mode Decomposition and Average Magnitude Difference Function
Authors: Shi Wei Wei , Xiong Wei Hua , Chu Yun Yun , Liu Yu
Published: June 2013

Speech endpoint detection plays an important role in speech signal processing. In this paper, a method of speech endpoint detection based on empirical mode decomposition is introduced for accurately detecting the speech endpoint. This method used in speech signal decomposition gets a set of intrinsic mode functions (IMF). An IMF which contained a lot of noise must be filtered, and the rest of IMFs can be reconstructed to a new speech signal. The speech endpoint is detected by average magnitude difference function precisely. Simulation experiments show that the method proposed in this paper can eliminate the impact of noise effectively and detect the speech signal endpoint accurately.
A Finger Vein Recognition Method Based on PCA-RBF Neural Network
Authors: Yu Cheng Bo , Tan Jun , Yu Lei , Tian Yin Li
Published: June 2013

This paper puts forward a finger vein classification algorithm which combines Principal Component Analysis (PCA) with Radial Basis Function (RBF) neural network algorithm, named the PCA-RBF algorithm. Use the training sample to reduce PCA dimensions, and abstract the main component of the image. Because of the advantages of RBF neural network classifying, put finger vein images into different classes, and then use the shortest distance to recognize. Through the experiment result comparing with Back Propagation (BP) neural network, PCA-RBF neural network is better in finger vein recognition. The result shows that PCA-RBF has faster training speed, simpler algorithm and higher recognition rate.
Topology Optimization of the Transmission Shift Fork
Authors: Liu Zuo Shi , Zhang Xiao Hong , Gao Xiu Qin
Published: June 2013

This paper introduces the topology optimization theory and mathematical model of the variable density method, to use HyerMesh Optistruct module, designs the structure of the transmission shift fork by topological optimization. First establishes the original three-dimensional model of the fork according to the design requirement, then in the HyerMesh establishes the finite element model of the fork, and sets the fork load constraints and the manufacturing process constraints, finally gets a reasonable distribution of materials, uniform force and can be used for manufacturing the ideal topology configuration, and then by the Ossmooth tool obtains directly optimized three-dimensional model. The topological optimization technique, can effectively guides the design personnel of product structure modification and new product structure design, makes product design structure high reliability, economical.
Radom Intermediate Points Based Path Planning in Unknown Environment
Authors: Xu Qi Lei , Tang Gong You , Liu Hai Lin , Ge Shao Ting , Yang Xue
Published: June 2013

This paper presents RandomBug, a novel real-time path planning algorithm, for an autonomous mobile agent in completely unknown environment. According to this algorithm, all the planned paths are described and stored in the form of vectors. When the agent moves along the planned paths, it only considers the rotation angle and the movement distance in a single direction. The algorithm combines range sensor data with a safety radius to determine the blocking obstacles and calculate the shorter path by choosing the random intermediate points. When there is obstacle blocking in the current path, the intermediate points will be calculated randomly and the planned path will be regenerated by inserting the selected random intermediate points. Simulation results are given to show the effectiveness of the proposed algorithm.
Build a Game Dynamical System through the Optimization of the Artificial Fish Swarm Algorithm
Authors: Wu Hou Min , Xiao Shi Lei , Chen Feng Qin
Published: June 2013

The artificial fish swarm algorithm is a new bionic optimization algorithm, which focuses on constructing an optimization model of autonomous animats. Researches on it have been applied in many fields. This paper makes an in-depth study of the artificial fish swarm algorithm model, and tries to optimize and expand it for the use of building a game dynamical system, so as to serve as a technical and theoretical reference in designing and applying the game engine of AI movement.
Achieving Quick Trust Transmission in P2P Network Based on Matrix Operation
Authors: Wang Hao Yu , Zhao Yun Feng , Meng Xiang De , Ji Xiao Juan
Published: June 2013

The design of mechanism is used to calculate node reliability of incredible P2P network. The mechanism through matrix shows the trust relationship between nodes in the network, through matrix operation realizes the trust transfer process fast, and through a trusted server provides calculation service of trust degree for nodes in P2P network.
Wireless Mesh Network Technical Security Performance Analysis
Authors: Chen Dong Ya
Published: June 2013

Along with the development of information technology, the Wireless Mesh Network gradually unfolded itself. This paper presents the development of Wireless Mesh Network, the existing research results and safety performance analysis.