bluuebunny/crossref_metadata_2025 huggingface dataset:
A Structural Health Monitoring System for the Full Scale Aircraft Fatigue Test
Authors: Zhang Yi Shan , Wang Zhi , Cai Jia Kun
Published: September 2013

A structural health monitoring system especially for the full scale aircraft fatigue test is being developed to monitor, interpret, and make decisions based on the information from sensors during experiment. The functions of the system are achieved by different subsystems including data acquisition subsystem, control and manage subsystem, data visualization subsystem and data process subsystem. Subsystems communicate each other by the user-defined protocol based upon the TCP protocol. The structural health monitoring system uses five types of sensors, including strain gauge, ultrasonic transducer, PZT sensor, FBG sensor, and ICMS sensor. Finally this system is being used in the extended fatigue test of a certain aircraft, and had captured several structure faults.
Noncontacting Velocimetry Research Using Spatial Filter Based on Line Scan Sensor Arrays
Authors: Du Yong , Liu Ai Dong
Published: September 2013

A noncontacting velocimetry technique based on line scan sensor arrays is proposed. Auto-correlation method is the mainly velocity measurement algorithm before. In my research, I will introduce a novel spatial filtering method based on line scan sensor for noncontacting velocimetry. When used for measuring a vehicles velocity, the variation of the distance between the sensor and the road may cause a primary source of errors. In this paper, an adaptive Double-channel optical system is recommended to eliminate the errors, and we verify the effectiveness of the design in theory.
A New High-Dynamic-Range Compression and Detail Enhancement Algorithm for Infrared Images
Authors: Liu Ting Ting , Jiang Ya Dong , Ding Wei Yi , Meng Xiang Sheng , Wang Xian
Published: September 2013

Infrared images have the high dynamic range characteristic, generally digitized to 14 bit. While most display devices can only show 8 bit images, so high bit-wide infrared image signal should be compressed to low bit-wide display data without losing the important detail information. A new high-dynamic-range compression and detail enhancement algorithm for infrared images is presented in this paper. In the proposed algorithm, the original infrared image is separated into the low-frequency base component and the high-frequency detail component. Then the base component is compressed with the simple gray level linear mapping, and the detail component is enhanced with the S-curve transformation. Finally, the two components are combined to get the 8 bit enhanced image. The experimental results show that the proposed algorithm can achieve the dynamic range compression while effectively preserve and enhance the local detail information.
2-D DOA Estimation of Coherent Wide-Band Sources for Arbitrary Array Plane Geometry
Authors: Wang Ai Ying , Zhu Li Dong
Published: September 2013

Direction of Arrival (DOA) estimation is of big importance in Sonar, Radar and satellite systems. In this work, we estimated the 2-D DOA (two-dimensional DOA) of coherent wide-band sources by using a broadband focusing method, which was based on the separation of angle and frequency of the array manifold matrix. At first, we transform the element position of the plane array into the spherical coordinates. Then we adopted a generalized Fourier series expansion based on the spherical harmonics and the first kind of spherical Bessel functions to get the arbitrary plane array steering vector. In this vector, the angle and frequency of array manifold matrix was separated, so we could get the matrix of focusing transformation. Finally, we used the traditional narrow-band algorithm to estimate the 2-D DOA. The design is suitable for arbitrary array geometry models of coherent broadband signals, and avoids the angle pre-estimation in traditional methods. Simulation results demonstrate its validity and better performance.
Wear Particles Recognition Based on Improved LBP
Authors: Wang Guo De , Jing Zhi Sheng , Qin Guo Wei , Tu Shan Chao
Published: September 2013

Wear particles recognition is a key link in the process of Ferrography analysis. Different kinds of wear particles vary greatly in texture, texture feature is one of the most important feature in wear particles recognition. Local Binary Pattern (LBP) is an efficient operator for texture description. The binary sequence of traditional LBP operator is obtained by the comparison between the gray value of the neighborhood and the gray value of the center pixel of the neighborhood, the comparison is too simple to cause the loss of the texture. In this paper, an improved LBP operator is presented for texture feature extraction and it is applied to the recognition of severe sliding particles, fatigue spall particles and laminar particles. The experimental results show that our method is an effective feature extraction method and obtains better recognition accuracy compared with other methods.
Application of Random Amplitude-Phase Optical Encryption Based on Normal Speckle Pattern Interference in Digital Watermarking
Authors: Chen Liu , Gu Ji Hua , Wu Wen Ming , Guo Jia Xing
Published: September 2013

In order to solve the problems of complex process of decryption and high cost when shifting the key codes of optical encrypted watermark, a method of applying double random amplitude-phase encryption to digital watermarking is introduced. The encrypted ESPI watermark is obtained by random amplitude-phase optical encryption based on normal speckle interference. An encrypted Fourier transform-ESPI watermarking scheme and an encrypted digital holography-ESPI watermarking scheme are introduced. Computer Simulation results show the feasibility of the new schemes. The compared results of image processing show that the encrypted ESPI watermark has good compatibility when combined with Fourier transform watermarking and digital holographic watermarking.
Research on Mining Technology of Communication Data Stream Based on Computer Network Multimedia
Authors: Li Yang
Published: September 2013

According to the application of the computer network multimedia is more and more widely, and is also correspondingly strong shock by the network media and informatization for network communication and other requirements, progress and development of society constantly threatened by the impact of network multimedia communication. The paper theory-based with network multimedia communication to analysis the characteristics and performance requirements of network multimedia communication, combining to relevant material of the data flow, research and analyze the data flow of the mining technology, to carries on system analysis of the data flow, construct system model based on the network multimedia communication data stream, in order to better guide the dynamic analysis to network multimedia communication data flow, to master the multimedia communication data fusion and decision, so as to understand the users needs to network multimedia communication, to better guide the sustainable development of the network multimedia communication.
Research of Distributed Search Engine Based on Hadoop (DSEH)
Authors: Lu An Sheng , Li Zi Hui , Jin Hui Xiu , Zhang Jia Yi , Wei Hang
Published: September 2013

The study of distributed search engine based on Hadoop (referred to as DSEH) has put forward system structure of distributed web service search engine based on Map/Reduce, and made introduction to related modules. Built the whole system on Hadoop framework by Map/Reduce and analyzed the key technologies of distributed search engine.
Analysis and Research of Cloud Computing Data Center
Authors: Guo Le Jiang , Zheng Feng , Hu Ya Hui , Xiao Lei , Liu Liang
Published: September 2013

Cloud computing data centers can be called cloud computing centers. It has put forward newer and higher demands for data centers with the development of cloud computing technologies. This paper will discuss what are cloud computing data centers, cloud computing data center construction, cloud computing data center architecture, cloud computing data center management and maintenance, and the relationship between cloud computing data centers and clouds.
Elitist Distance Based Pareto Genetic Unicast Routing Scheme with Always Best Connected Support
Authors: Yang Ji Hao , Wang Xing Wei , Huang Min
Published: September 2013

In this paper, an ABC (Always Best Connected) supported QoS (Quality of Service) unicast routing scheme is proposed. In the proposed scheme, in order to overcome difficulties on accurately measuring network link parameter values and exactly expressing user QoS requirements, the knowledge of the fuzzy mathematics and probability theory is introduced, and the range is used to describe these parameters; both of the users utility and the network providers utility are computed, and gaming analysis is taken to deal with profits of both the user and the network provider; EDPGA (Elitist Distance-based Pareto Genetic Algorithm) is used to find the specific QoS unicast path with Pareto optimum under Nash Equilibrium among all parties utilities achieved or approached. While comparing with unicast routing scheme based on Dijkstra and the game theory based fuzzy unicast QoS routing scheme, simulation results show that this proposed scheme is both feasible and effective.
Development Key Technologies and Terminals Based on Low Cost Experiential Rural Information Service
Authors: Xiao Ying , Zhang Gang Hong , Zhang Han , Gao Wan Lin , Luo Xuan , Han Meng
Published: September 2013

Information resource break (especially information technology) the bottlenecks of the understanding demand for farmers. Experiential understanding of the content is the starting point for farmers receiving. Low cost experiential information service platform is using network path and terminal users to support multiple types of information resources for different farmers. Through enhance the effects of scientific and technological information services, and to break the limit farmers to master the key technology bottlenecks in information and knowledge, Thus to achieve the purposes of the farmers scientific production and modern life. As the development of the Internet, Instant Messaging will perform a wider use and is growing up day after day .Especially instant messaging system about enterprise has become a hot spot at home and abroad. Along with the development of the Internet, the use of instant messaging is becoming more and more widely, and the service providers also provide more and more rich communication service functions. This paper researches on the various kinds of Instant Messaging System, analyzes the functionality of Instant Messaging System, and proposes system architecture.
Study on Unbalanced Electromagnetic Force of Turbine-Generator Inter Turn Short Circuit and its Relevant Fault
Authors: Zhang Wen Jing , Li Yong Gang , Wu Yu Ca
Published: September 2013

Inter turn short circuit fault is very common for turbine-generator, which will produce unbalanced electromagnetic force (UEMF) together with its relevant fault, namely dynamic eccentric, on the rotor. After complete finite element simulation by ANSYS, The relationship of rotor winding short positions and short degrees with UEMF were studied. And then, only the dynamic eccentric fault occurs, the relations of dynamic eccentric angles and dynamic eccentric degrees with UEMF were discussed as well. Whats more, by comprehensive consideration of the two faults, the characteristic of the force and its change law were researched. This paper provides a viable path to study the vibration law and fault diagnosis of turbine-generator in multi-source stress.
A Personalized Intelligent Recommender System Based on Agent Technology
Authors: Lian Wen Juan , Zhao Jian Li , Li Yu Jun
Published: September 2013

The paper introduces a personalized intelligent recommender system. The system characters include: (1) integrating Agent technology to improve the recommender system reactivity, proactivity and autonomy; (2) giving a mixed recommendation method with content-based recommendation; (3) proposing the personalized user model, which can describe long-term interests and short-term interests, effectively deal with the user interests drift problem.
An Angle Partitioning Based Algorithm for the ECFRD Problem in Wireless Sensor Network
Authors: Wang Yong , Dou Qiang , Peng Wei , Gong Zheng Hu
Published: September 2013

Energy-Constrained Ferry Route Design (ECFRD) Problem is an NP-hard problem to minimize the total route length of a message ferry to access all the sensor nodes in a sparse wireless sensor network, while the route length of a tour under a given value due to the energy constraint. In this paper, we propose an angle partitioning based algorithm (APBA) to solve the ECFRD problem. In APBA, the nodes are partitioned into groups according to the tangent angles of their coordinates, and the route length of each group will not exceed the energy constraint. The experimental results show that APBA can greatly reduce the total route length of the ferry. In the best case, 35% of the total route length can be saved, comparing previous nearest neighbor based split and route algorithms.
A Dynamic Task Scheduling Strategy Based on MVFSA in Cloud Computing Environment
Authors: Deng Xue Feng
Published: September 2013

Aiming at the task scheduling problem of the cloud computing, this paper proposes a dynamic task scheduling strategies based on MVFSA (Modified Very Fast Simulated Annealing) algorithm. The simulation results show that this strategy can improve the computation efficiency of the cloud computing, and maximize the quality of service for users.
Summarize the Security Issues of Internet of Things and Prospect of Future Trends
Authors: Xu Tong , Zhou Chun Yue , Yan Zi Qi
Published: September 2013

In the past decade, Internet of Things (IoT) has experienced a rapid development, but the accompanied security problems were discussed rarely. To some extent, it restricted the development of IoT. This paper summarized the security characters of IoT, discussed relevant security issues of different layers, especially in the perception layer. Finally from the aspect of some emerging technologies, this paper prospected the future develop trends of IoT.
Research on the Structure of Smart Laboratory Based on the Internet of Things Technology
Authors: Yan Zi Qi , Zhou Chun Yue , Xu Tong
Published: September 2013

Exerting the network's effectiveness, and by use of the tremendous advantages of the Internet of things, this paper puts forward the "Smart Laboratory" system of three-layer structure model, which acts on the management pattern of "integrating teaching and research, crossing subjects, multifunction", and discusses the design on different layers in the model. In the end of paper, the Smart Laboratory operation mechanism and management mechanism is also discussed.
Near Duplicated Text Detection Based on MapReduce
Authors: Shen Ling , Peng Qing Xi
Published: September 2013

As the emerging date intensive applications have received more and more attentions from researchers, its a severe challenge for near duplicated text detection for large scale data. This paper presents an algorithm based on MapReduce and ontology for near duplicated text detection via computing pair document similarity in large scale document collections. We mapping the words in the document to the synonym and then calculate the similarity between them. MapReduce is a programming model and an associated implementation for processing and generating large data sets. Users specify a map function that processes a key/value pair to generate a set of intermediate key /value pairs, and a reduce function that merges all intermediate values associated with the same intermediate key. In large scale test, experimental result demonstrates that this approach outperforms other state of the art solutions. Many advantages such as linear time and accuracy make the algorithm valuable in actual practice.
Analysis of the Confidence Mechanism Research in Machine Learning
Authors: Jiang Fang Chun , Tian Sheng Feng , Yin Chuan Huan , Lu Yun Fan
Published: September 2013

The confidence of the machine learning has been an integral part of the target of the research in the field of machine learning. According to the mechanism and method for confidence, the confidence mechanism in machine learning is divided into four classes. The basic principle of the mechanism, the methods and the latest research progress are expounded respectively. Finally, the problems of current research are discussed, and the research direction is pointed out.
The Distribution Network Reconfiguration Based on Spatial Data Mining
Authors: Sui Jia Yin , Wang Ying Nan , Ren Zhe
Published: September 2013

Distribution network reconfiguration is one of the essential functions of the DMS system; it can be attributed to a number of constraints of large-scale nonlinear combinatorial optimization problem in mathematics. The characteristic of load change of time and space will affect the results of load forecasting. Distribution network reconfiguration relies on the load forecasting results. This paper proposes the more realistic distribution reconfiguration scheme based on the GIS system with space information through spatial data mining. For the real-time and efficiency of effective assurance data, the interface design in GIS system and distribution automation system are also proposed. The geographical information and real-time information are connected seamlessly, so that this two system information is highly unified. The solution can provide the data basis for distribution reconfiguration scheme accurately, and improve power supply reliability of distribution network. It shows that through the example: GIS based on the spatial data mining can provide load in quantity, time, space prediction for the deeper research of distribution network reconfiguration.
Heterogeneous-Oriented Resource Allocation Method in Internet of Things
Authors: Lan Hai Yan , Song Hong Tao , Liu Hai Bo , Zhang Guo Yin
Published: September 2013

For various features of heterogeneous network access, combined with multi-master multiple slave Stackelberg game model, network pricing and resource allocation scheme of a heterogeneous IOT is proposed. A mobile end-user utility function based on income and spending is designed. After the operator's price is determined, the utility function satisfies the concave conditions to ensure the existence of mobile user's non-cooperative Nash equilibrium point, resulting in multiple resource participants in the joint optimal objective.
Application of Virtual Reality Technology in Construction Control and Management
Authors: Qin Yu Ping
Published: September 2013

The virtual reality is an advanced technology in the modern man-made environment. A three-dimensional virtual reality world is produced by computer simulation to make users feel as if they were personally on the scene. By building the virtual model and virtual construction process, construction control and management based on the virtual reality system can be used to improve efficiency of project management and construction, ensure construction progress, save cost, improve safety and reduce engineering risk, so as to provide guidance for engineering construction.
A Study and Implementation of Network Analysis for Mobile GIS
Authors: Guo Fei Jun , Zhang Jie
Published: September 2013

In recent years, the mobile GIS applications have been developed fast and are still in great demand with the popularity of smart phones. For the diversity of network analysis, this paper puts forward an universal algorithm for path planning based on the thoughts of heuristic A* algorithm to support customization of target rule, weight rule and result rule. It aims at finding a path planning algorithm applicable to most mobile GIS network analysis.
Revelation of US OTCBB Disclosure System to Chinese Over-the-Counter Market Disclosure
Authors: Chen Han Ping , Chang Qing
Published: September 2013

Integrated Bayesian and Nash equilibrium model, using game theory mathematical calculation method, we researched the game between the government and the market maker in the U.S. OTCBB information disclosure. We concluded that government should strengthen management of the information disclosure mechanism, improve the information disclosure is the key to resolve the problem of asymmetric information, OTCBB information disclosure policies and measures need to be perfected. According to this, we researched the contents of U.S. OTCBB information disclosure and its characteristics, also we analysis the information disclosure system of the U.S. OTCBB experience and Its Enlightenment to China and use for reference.
Research on Management Platform of Electronic Commerce Supply Chain Based on Programming Theory and XML Technology
Authors: Chen Jie
Published: September 2013

In the era of Information technology, supply chain management is as. It not only brings us a new management tool,but also is important to bring the updating and re-planning of management concepts, design and optimization of the business processes means. To the end, it is combined with a modern e-commerce IT environment and combined with the characteristics of e-commerce environment to optimize the structure of the supply chain management, as well as in comparative analysis on the difference with supply chain management under traditional business environment. Based on the e-commerce environment, how to optimize the mode of supply chain management is focused in this paper. By using XML technical support methods, the author optimized warehouse management, economies scale and so on. Finally, Based on the optimization of the supply chain management model, the author established the platform of supply chain management based on e-commerce environment, as well as described a detailed modeling and program design and developed the module of e-commerce supply chain management platform.
3D Magnetic Field and Loss Analysis at the No Load Condition in the End Region of 4-Poles Large Turbine Generator
Authors: Zhou Guang Hou , Han Li , Fan Zhen Nan
Published: September 2013

To study the principle of magnetic field and loss at the end region of large 4-poles large turbine generator, 3D transient electromagnetic field finite element (FE) models of the end region are established respectively. Considering the factors such as rotor motion, core non-linearity and time-varying of electromagnetic field, the anisotropic heat conductivity and different heat dissipation conditions of stator end region, a 50Hz, 1150MW, 4-poles large turbine generator is investigated. The magnetic field and loss at no-load condition of the generator end region are calculated and the calculation results are compared with the test data. The result shows that the calculation model is accurate.
Analysis on Usage Comfort of Highway Based on Lateral Acceleration and Lateral Acceleration Change Rate
Authors: Wang Zheng Yu , Li Cheng Bing , Xu Jin
Published: September 2013

To control the lateral acceleration of driving vehicle and its rate of growth is always an important part in road geometric design. At present, vehicles are simplified as single rigid body when and are calculated, moreover, the calculation is made in two-dimensional plane, which does not comply with the actuality. In this article, Road-Driver-Vehicle simulation system (RDVS) is applied to get and of driving vehicle on 3 test roads selected from the mountainous area of southwestern China. In RDVS, the dynamic vehicle model is driven on three-dimensional roads under the control of driver model, so it is more close to the real driving. The results show: got from RDVS is bigger than that from single rigid body calculation. As RDVS is more reliable, from single rigid body calculation may cause an insufficient estimation: suppose the driver drives at the designed speed, though the designed speed varies, the peak value of of the three objects range in [2.0m/s2, 2.5m/s2], beyond the limit of comfort but within tolerable scope; as for subject C without application of clothoid, will exceed the limit of 1.0m/s3. So it is suggested using clothoid, considering improving the quality.
Rubber Block Granular Control Study in the Crushing Process Waste Tires
Authors: Lv Yi
Published: September 2013

Decreases the broken tire rubber block granularity can shorten tire flour milling process. Cutting the tire rubber block size control during processing method can be changed to achieve. Method by previously cut on the tire tread and an annular notch cut layered tread colloid. Tire crushing process down into tire tread and colloidal cutting kerf. Slitting and cutting the tire during the tire clamped in a fixed state. Maintaining the tire tread and the position of the cutting tool is parallel. Feeding the tool or tire in-process control of the tool infeed depth and speed of rotation of the tire. Cutting the tread rubber on the circular incision is to control the cutting of the plastic dispersion block. Achieve tread colloidal particle size control cutting. Colloidal tread cutting circular incision and control the cutting tool feed rate is achieved rubber block granularity control methods.
Investigation on the Anti-Corrosion Layer of the Power Transmission Steel Structures
Authors: Li Li , Tian Jun Ling , Peng Yi Liang , Li Guo Xin
Published: September 2013

The power transmission steel structures are used in the outdoor and the durability will be decreased due to the various corrosions, so the structures usually coated the anti-corrosion layers such as hot-dip coating, zinc-rich coating or thermal spray zinc coating. The anti-corrosion layers on three power transmission steel structures in Henan province, China were investigated by the corrosion morphology and the residual coating thickness. The results indicated that the corrosion degree of the bolts is higher than that of the steels, and there are local corrosions occurred on the surface of the steels due to the plating leakage or clash.
Research on Thermal Properties of a Solar Air Collector
Authors: Li Wen Fang , Wu Lang , Xiong Lei
Published: September 2013

Solar heating has a broad application prospects in northern China. A new corrugated solar air collector within the heat plate holes was designed in this paper, and compared to air collector with a flat-plate collector plate in the same conditions, the current state, temperature distribution of the collector and its efficiency was studied, to identified its thermal performance. Experimental verification showed the experimental results accorded with numerical simulation.
The Design of Computer Flow Ratio Control System Based on Network Instrument
Authors: Ren Guo Ying
Published: September 2013

In order to meet the requirements of industrial production, to obtaine good computer flow ratio control system, the computer flow ratio control system based on network instrument has been designed. The design regards networked instrument as the medium of information exchange, and gives the computer flow ratio control system design and implementation scheme, focuses on the analysis of the network equipment application in the design of computer flow ratio control system. The design first give the significance of flow ratio control in the actual production process; then expound the mechanism of system debugging; after that, combine with the characteristics of network instrument, put forward the design scheme of flow ratio control system, and carry on some research on it;finally, draw the conclusion by making comparison. The design results show that, the system has high control precision and stability, which can obtain good control effect, meet the requirement of production process.
Research on Software Architecture of the Design and Development of the Computer System on the Basis of Industrial Process Control
Authors: Zhang Yan
Published: September 2013

The industrial production of each link has widespread application of industrial process control in the computer system, the reliability and openness of the hardware equipment and hardware system should be ensured in the industrial process control computer system, implement rational software system architecture design should also be ensured, which plays a key role in the guarantee of the advancement and practicability of the system.
The Intelligent Control of Greenhouse Environment
Authors: Li Shu Jiang , Wang Chen , Ke Xiang Yu , Wang Xiang Dong
Published: September 2013

The greenhouse is an important part of facilities agriculture,also is one of the focus of the development of modern agriculture. Including temperature and humidity are the two most important environmental factors in greenhouse, nonlinear, strong coupling relationship between them, increasing the difficulty of greenhouse control. According to this complicated problem, this paper establishes a model of greenhouse temperature and humidity, studies a kind of model based fuzzy PID intelligent greenhouse control algorithm,and used MATLAB/simulink simulation platform, set up a simulation system. Results show that the control algorithm which solve the problem of strong coupling of temperature and humidity, and stable control of the greenhouse temperature and humidity. With a small amount of overshoot and fast convergence rate, etc. Satisfy the greenhouse nonlinear, big lag, multiple input, multiple output complex system control requirements.
Remote Control Scheme in Smart Home
Authors: Wang Ping , Chen Bin
Published: September 2013

The paper introduces the concept of Smart Home, and makes a relatively comprehensive research on the network system of Smart Home based on the present market status and technical standards. Compared to the present products with simple functions and less interaction, we bring up and implement a new Smart Home scheme with more reliability, high ratio of capability to price and considerable convenience.
Optimal Servo Design for the Dual-Stator Toroidal Motor
Authors: Liu Xin , Xu Li Zhong
Published: September 2013

Dual-stator toroidal motor is a new type of motor. The basic structure and principle of the motor were introduced. The state equations of toroidal motor were presented, the response considering speed fluctuations of the motor was given as well. The objection function was given, and the optimal servo of the motor was designed. The control strategy was used to remove the speed fluctuations and realize desired speed tracking. The state feedback control scheme was obtained and the control signals were also presented. Small speed track errors were achieved and the speed fluctuations of the motor system were eliminated. The results justify the validity of the servo, and offer meaningful instruction for further research and practical application of the novel motor.
The Design and Validation of DFT System for Mixed-Signal Circuits Based on JTAG
Authors: Liao Guo Gang , Li Jun
Published: September 2013

Nowadays with the increases of the density of large scale integrated circuits, researches of Design for Test (DFT) become more and more important, JTAG (JTAG: Joint Test Action Group, also called Boundary Scan ) has been widely used in test area , which improves the testability and reliability of mixed-signal circuits. This paper puts forward a scheme to design a Built-in Test System (BITS) based on boundary scan technology. The BITS is realized in a weapon electronic control system, which is composed of mixed-signal circuits including ARM, AD/DA, FPGA, etc. With this method, several test experiments are carried out in the BITS, which include infrastructure integrity test, interconnect test, cluster test, AD/DA test and so on. The results of experiments show that the Built-in Test System based on JTAG can work normally, which is able to reduce effectively the complexity and the time of test. In a word, the capability of BITS is viable and the system is a virtual tool in the process of DFT design and application.
Distortion Correction for the Gun Barrel Bore Panoramic Image
Authors: Peng Fu Qiang , Chen Qiang , Bao Jun Wei
Published: September 2013

Single Reflector Panoramic Imaging System (SRPIS) has been widely used because of its advantages such as simple structure, fast imaging, integration and miniaturization. It can observe objects around the reflector mirror, which fits for the quality inspection of gun barrel bore. However, its images often suffer from serious distortions in radial and tangential directions. Therefore, to ensure the accuracy of captured images, distortion must be eliminated. In this paper, a distortion correction method is proposed based on the imaging characteristics of SRPIS. Firstly the relationship between the height of a certain point on the gun barrel bore and the radius of image point is derived. Then the correction model is built based on the relationship. Aiming at the captured annular image, a new chessboard corner detection algorithm is proposed. The correction parameters are obtained by using the algorithm according to the labeled image. The real experiment results demonstrate that the correction effects of radial and tangential distortions are satisfactory. The error is controlled at sub-pixel level.
Space Truss Displacement Method for Plate-Cone Reticulated Shell
Authors: Wang Xing , Feng Chao , Chen Nie
Published: September 2013

Plate-cone reticulated shell is a new type of space structures with good mechanical behavior and technical economy. In this dissertation, plate-cone reticulated shell is equated to double-layer reticulated shell with two kinds of material members. The internal forces and the displacement of plate-cone reticulated shell can be calculated by space truss displacement method.
The Design and Implementation of the MD5 Algorithm Based on FPGA
Authors: Wang Lei , Yu Yan Yan , Huang Qian , Yang Jun , Zhao Zheng Peng
Published: September 2013

This paper introduces the principle of digital signature algorithm MD5, focused on the calculation phase of the algorithm, the algorithm structure iteration of the loop, and to optimize its calculation phase, and given FPGA design icon, the experiment can be drawn based on FPGA with less resource, fast implementation of the MD5 algorithm. The hardware implementation of the MD5 hash algorithm HMACs build encryption accelerator which has some practical value.
Research on Traffic Delay Predicting at Signalized Intersection Based on Neural Network
Authors: Zheng Chang Jiang , Lin De Gang , Zheng Shu Kang , Chen Shu Yan
Published: September 2013

Available traffic delays prediction models for signalized intersection tend to predict the traffic delays under certain conditions and they are weak in adapt to different situation. In the paper, based on the theories of BP neural network, a network model, having a strong ability to adapt to different conditions, for traffic delay in average hours at a signalized intersection is established. It is trained and tested utilizing the data of traffic delay in average hours at a certain entrance of a signalized intersection. The predicted results and the actual data are compared with each other and the results prove the reliability and effectiveness of BP neural network in predicting traffic delays.
Simulation and Realization of Narrow-Band Interference Suppression Technology Using IIR Filter
Authors: Zhang Ping Hua , Tan Li Xin , Huang Xiu Liang
Published: September 2013

An application of a second-order adaptive lattice IIR notch filter for rejection of NBI in direct sequence spread spectrum system (DSSS) is studied . Closed-form analytical expressions for signal-to-noise ratio (SNR) improvement factor and bit error ratio (BER) of the system are derived. The performances of the algorithm have been researched and simulated in MATLAB. The adaptive filter is designed and implemented on FPGA, which is simple to realize. It is shown by the test on hardware circuit that the filter had a capacity of about 21dB for NBI rejection which satisfies the requirement.
Research on Electronic Equipment Vibration Isolation System in Artillery Based on ADAMS
Authors: Li Ben , Ren Guo Quan , Li Dong Wei , Jiao Ying Qi , Xin Zhou
Published: September 2013

View of the Traveling and firing of the self-propelled artillery, the electronic equipments contained were suffered severe vibration and shock which will have a serious impact on the performance of electronic devices, reducing its combat capability. The physical model of the electronic equipment vibration isolation system is established and the intrinsic parameters of the system are gotten through the analytic method. Then established electronic device isolation test system virtual platform model based on ADAMS. On this platform, by setting different parameters of the simulation of the entire system for vibration analysis, find out the impact of system parameters on the vibration isolation effect. Also simulated self-propelled artillery when traveling and shooting. The analysis results provide certain reference bases for type selection and assignment of the vibration isolation device.
Characteristics of Real-Time Imitation Control for Biped Robot: Falling Time Analysis
Authors: Cui Yi Feng , Shon Su Goog , Byun Hee Jung
Published: September 2013

The purpose of this paper is to show that a biped robot can walk by an imitation control. It proposes architecture and system for real-time imitation control of a biped robot. Using this method, the operator can interact with the robot to walk. The operator produces trajectory data necessary to start, stop, walk and redirect the robot. We have to send control commands or new angular position values for to the robot as fast as possible. To get intuition how fast the robot should be controlled, its falling time which as the primary time question is discussed. An inverted pendulum calculation example and the real robot fall down experiment were compared in this paper.
Design and Implementation of Servo Motor Speed Control System Based on STM32
Authors: Liu Jiang Yi , Sun Shu Ying
Published: September 2013

A speed control servo system based on STM32 is designed in order to realize the rapid, accurate, smooth speed control of rotary table. the system uses embedded microprocessor STM32F103 as the core, using the absolute encoder as the position sensor.The system achieved control of motor speed by PWM (pulse width modulation).Speed and current double loops control is used,and the expert PID control is used as the control algorithm. Through the analysis of the experimental results can be seen that the system has good stability, and the static and dynamic indicators meet the design accuracy.This design basically has reached the requirement of the servo motor speed control system.
Testing of Level of Vibration and Parameters of Bearings in Industrial Fan
Authors: Jovanović Dragan , Živković Nenad , Raos Miomir , Zivkovic Ljiljana , Jovanovic Milena , Praščevič Momir
Published: September 2013

Climate chambers are a complex system of electromechanical components used for conditioning of air for providing comfort and projected parameters of temperature, humidity, velocity and air cleanliness in the area. In this paper is presented examination of the fan unit company Flaktwoods GJLB-5-071, 17.95 kW, n=1450 rpm, with a multi-functional device Vibrotest 60, the Danish manufacturer Bruel & Kjaer, for diagnostic of parameters of vibration and condition of bearing. The measured parameters are related to: - levels of vibrations (including measurement points on the motor and on the fan) in the directions of coordinate axes, according to ISO 10816-1. - parameters of condition of bearing through the index of bearing condition BCU (Bearing Conditions Unit) and BCS (Bearing Spectrum Conditions) - analysis of the characteristic frequency of vibration in the spectrum, presented by FFT (Fast Fourier Transformation).
Random Excitation of a Car Component from the Road
Authors: Razvan Curtean , Lupea Iulian
Published: September 2013

In the present paper aspects regarding the analytical modeling, the simulation and the experiments related to random vibrations, with applications to automotive industry, are discussed. Simplified car dynamical models based on lumped masses, springs and dampers being exposed to random vibrations, are considered. The power spectral density is used to define the excitation produced by the unevenness of the road surface which are correlated to the vehicle speed. Two different approaches are observed in parallel. The analytical one is using the dynamical model of the car, the random excitation estimation, the transfer functions from the excitation sources to the target, and the response at the comfort points or the points of interest. The associated numerical calculations are performed with Matlab. For the second approach the finite element models of the car simplified structure are created and the simulations are performed. Statistical tools are used to describe the excitation sources and the response. Good correlation of the results for the two approached is observed. In the sequel a real car component made of plastic is considered. The estimation of the component structure stress with probability of 1σ, 2σ and 3σ, are coming out from the simulation of the part subjected to random vibrations by using finite element analysis. Frequency response functions (FRF) are experimentally measured in the laboratory by placing the plastic component on a shaker. The measured FRFs and the results are compared to the ones resulted from the simulation, observing a good correlation. The output of the random vibration analysis can be used to estimate the fatigue of the component.
Dynamic Analysis of a Lower Limb Prosthesis
Authors: Rusu Lucian , Toth-Taşcău Mirela , Toader-Pasti Cristian
Published: September 2013

The dynamic analysis of the lower limb prosthesis is necessary mainly for defining the joint mechanical specifications. This paper presents two models of lower limb prosthesis. Both models have two active joints (ankle and knee) and the same overall dimensions. The main difference between the two models consists in the joints mechanical parameters. The prosthesis elements are modeled according to the human anatomy, taking into account the weight of the amputated limb. Based on this preliminary data the two models were developed using the Solid Edge V20 software. The dynamic analysis was developed in Dynamic Designer Motion Professional module which is a subset of Motion Professional software. The gait cycle time was set to 2 seconds. There were studied two main stages during the gait cycle: extension (from hyper-flexion to hyper-extension), and flexion (vice versa), respectively. The input data are: geometrical model, material properties of the prosthesis elements, gravity force, joint laws of motions and ground reaction forces. Based on this input data the software calculates the path, velocity and acceleration of the prosthesis elements and reaction forces and torques in each joint.
Noise Source Monitoring in Industrial and Residential Mixed Areas
Authors: Nagy Ramona , Simoiu Dorin , Menyhardt Karoly , Bereteu Liviu
Published: September 2013

Today, reduction of industrial noise is a widely used concept for improving the life standard in vicinity of industrial and residential mixed areas. The human ear has a very poor auditory acuity in perceiving sounds produced by sound pressure variations in the very low frequencies or very high frequency range. Noise is, in general interpretation, disturbing sound, annoying or even dangerous, although this perception is subjective. There are at least two kinds of people, one that "adapted" psychological noise and learned to work with it and another which gradually became sensitive to noise. In the current situation of industrial development, and housing, many locations of manufacturing facilities are near residential areas, so it is very important to realize noise levels monitoring. Legislation provides for annual measurements of noise levels to limit industrial properties. This paper describes the monitoring, over a period of several years, the noise sources within a company at the limits of Timisoara.
Optimal Homotopy Asymptotic Approach to Self-Excited Vibrations
Authors: Herisanu Nicolae , Marinca Vasile
Published: September 2013

This paper is concerned with analytical treatment of nonlinear oscillation of a self-excited system. An analytic approximate technique, namely OHAM is employed for this purpose. Our procedure provides us with a convenient way to optimally control the convergence of solutions, such that the accuracy is always guaranteed. An excellent agreement of the approximate solutions with the numerical ones has been demonstrated. Three examples are given and the results reveal that the procedure is very effective and accurate, demonstrating the general validity and the great potential of the OHAM for solving strongly nonlinear problems.
Theoretical and Experimental Studies on Magnetic Dampers
Authors: Orăşanu Nicolaie , Craifaleanu Andrei , Dragomirescu Cristian
Published: September 2013

The proper operation and reliability of numerous mechanical devices depends on reducing the vibrations of embedded components, modeled as multi-degree-of-freedom dynamic systems. This can be achieved by using various types of absorbers. The design of such devices is conditioned by the understanding of the variation of their technical characteristics with the constructive parameters. The present paper is dedicated to a special type of dampers, based on the use of the magnetic phenomenon. However, available empirical formulae for the damping characteristics of magnetic dampers do not reveal all significant dependencies. Based on theoretical, numerical and experimental methods, the paper brings a number of contributions concerning the relation between the damping characteristics of a magnetic damper and some of its constructive parameters. Variation curves, useful both for theoretical studies and practical applications, are plotted.
The Study of the Pendulum with Heavy Neo-Hookean Rod
Authors: Stanescu Nicolae Doru , Popa Dinel
Published: September 2013

The present paper is a generalization of the problem of a rubber spring pendulum discussed by Bhattacharyya in 2000 and Stănescu in 2011, which studied the case of the neo-Hookean rod without mass. In our paper we consider that the mass of the neo-Hookean rod is not negligible and its deformation is realized such that at any moment of time the rod can be treated as a homogeneous rigid bar of variable length. Using the second order Lagrange equations we obtained the equations of motion in the most general case and we identified as particular cases the situations presented in the bibliography. We also performed a study of the equilibrium positions and their stability. A study of the small oscillations about the stable equilibrium positions is realized too. The theoretical results are finally compared to those obtained by numerical simulation.
In Situ Measurement of Electrical Resistivity of Ocean Sediments Containing Gas Hydrates
Authors: Chen Yu Feng , Liang De Qing , Wu Neng You
Published: September 2013

An understanding of the physical properties of hydrate-bearing sediment is necessary for interpretation of geophysical data collected in field settings. We have conducted a laboratory experiment to measure the electrical property of initially water saturated sediment containing natural gas hydrate. When gas hydrate was formed from pore fluid in ocean sediment, bulk sediment resistivity was significantly increased. The resistivity of the sediment was largely changed below 20% hydrate saturation. With the increasing hydrate saturation, the resistivity of sediment was increased and the resistivity of pore fluid was decrease. In the final process of hydrate formation, the resistivity depression was found mainly due to the transition of gas hydrate morphology. The electrical resistivity of hydrate specimens varied from 1.930 Ohm.m to 3.950 Ohm.m for saturation ranging from 0% to 52.68%. Besides, the dependence of the resistivity index versus hydrate saturation is inconsistent with Archies law. The results of our studies have important implications for quantitative laboratory and field calibration of geophysical measurements within gas hydratebearing intervals.