bluuebunny/crossref_metadata_2025 huggingface dataset:
Design of Capacity Loss Tester of Power Transformer
Authors: Pan Wen Cheng
Published: December 2012

A capacity loss tester for no-load and with-load testing of power transformer has been developed. The tester has the ability of sampling the three-phase voltage and current simultaneously. Programmable counter array (PCA) unit in MPU, which captures zero-crossing of signal by the function of positive and negative edge trigger, is applied to the average phase detection of zero-crossing in bi-direction, in order to acquire the phase difference and period accurately. In terms of software, synchronism sampling method based on real-time parameter self-optimizing is adopted to minimize period truncation error, and the measuring accuracy is improved. The capacity of the power transformer is discriminated by table-look-up method in software, corresponding to different load loss. The testing result is converted from the value under testing temperature to the value under the condition of reference temperature (75°C).
Improved Minimum Distance Discrimination Method Used in Image Analysis of Fabric Wear Resistance
Authors: Su Jian Xia , Han Run Ping , Shi Li Min , Qian Xing He
Published: December 2012

With the increasing attention of textile, the wear resistance of the fabric is more and more important today. The wear resistance is judged by the sample and standard sample according to sensory contrast complete, but this approach has repeated poor consistency. The subjective factors of testers influence the result heavily. So the powerful image processing tools of MATLAB was used in the analysis of fabrics image processing. By image read, display and interception, image preprocessing, and feature extraction value, the eigenvalues of total area of the hair bulb, maximum area of the hair bulb, and hair bulb number were obtained. After the improved minimum distance discrimination method was used to determine the level of wear resistance by computer. Tests show that fabrics wear resistance level can be judged quickly, accurately and automatically.
Intelligent Aquaculture Monitoring System Based on Fieldbus
Authors: Jiang Zhong Qiu , Li Ren He
Published: December 2012

The paper analyses the status and some problems of aquiculture in china, and makes use of industrial control fieldbus and Intranet technology to achieve the hardware and software design and control strategies of factory aquaculture, and applies WEB server and database server and browser to form the management system of environment control and production process. The system can realize real-time control of dissolved oxygen and temperature and PH in pond, and make them stabilize in optimum value, and remarkably improve productivity. The test results have proved that the system is simply operated and good controlling performance; the system can save energy, and provide the practicable measures for aquiculture.
Observe Phase Body by Improving Lightly-Off-Axis Interferometry under Optical Microscopy
Authors: Wang Ya Wei , Zhu Xing Long , Shang Xue Fu , Xu Yuan Yuan , Lv Cui Hong , Jin Wei Feng
Published: December 2012

Recently, the phase microscopy imaging (PMI) got more and more application in phase body observing. In this article, we put out one off-axis interferometry adding method utilizing amplification of optical microscope (OM), in which, one device was designed by improving Mach-Zehnder optical structure in order to suit with the structure of OM. A wrapped phase image could be got by this system base on Hilbert off-axis interferometry method. The experimental results of samples (one glass grating and polystyrene micro particle) show that unwrapping images retrieval the shape and structure of phase bodies and the system works well. The improved optical microscope system can observe both opacity specimens and translucent specimens.
Research on Phase Compensation of Nonlinearity Error in Heterodyne Interferometer
Authors: Ren Xiao , Hou Wen Mei
Published: December 2012

A novel method to eliminate nonlinearity error in heterodyne interferometer is studied in the paper. A simple phase compensation system is built and the nonlinearity error is eliminated by rotating the polarizer in front of the optical detector in interferometer according to phase difference signal. The experiments demonstrate that the method is available to eliminate one-order or high-order nonlinearity in heterodyne interferometer. The effects to decrease nonlinearity error depend on high measuring precision of phase difference and high control precision of the rotating polarizer.
Simulation of Methyl Tertiary Butyl Ether Production in Catalytic Distillation
Authors: Chen Jin Nan , Zhang Yu Chun , Sun Xing Yong
Published: December 2012

The software of the catalytic distillation process of methyl tertiary butyl ether was developed by using Process Simulation System Platform. The isobutylene conversion rate was calculated by using the catalytic distillation software. The relative error of isobutylene conversion rate between the simulation results and the design data from the China Petroleum Hohhot Petrochemical Co. was less than 5%. The relative error satisfies industrial design requirements. At present, enterprise workers use this software to learn how to operate the catalytic distillation process. The catalytic distillation software is further used to study the influence of reaction temperature and reflux ratio on the isobutylene conversion rate which can be used for future empirical model development and control studies.
Zonal Imaging Algorithm of Range-Speed Target Based on the LMSF Radar Signal
Authors: Li Yu Qiong , He Song Hua , Li Guang Zhu , Ou Jianping , Zhang Jun
Published: December 2012

The automatic recognition of range-spread target is based on its range profile. When obtaining its range profile by using synthetic wideband radar signal, the different-range scatters would be overlapped because of the range-doppler coupling effect. The overlapping effect affects the ability of the automatic recognition algorithm. According to this, based on the Linearly Modulated Stepped Frequency (LMSF) radar signal, coherent processing of range profiles to obtain zonal image of range-spread target is proposed in this paper, which avoids the overlapping effect. The theoretical model of the zonal image of range-spread target is presented, the signal processing flow is derived, and the simulation result of zonal image is also given in this paper.
Flash Sliver Prevents Laser Penetrating Organic Materials
Authors: Wang Fu Ping , Fan Wei , Su Sen , Liu Sheng Xiong , Yin Zhi Yong
Published: December 2012

High-quality point clouds are the bases of high-accuracy three-dimensional (3D) model. How to obtain the corresponding surface point clouds is always an important work in reverse engineering. Faro Laser Scanner Fonton120 was used to scan an organic material which is composed of potassium stearate, sodium stearate, polyvinyl alcohol and paraffin liquid in a dark room. The organic material has fewer reflectors and is penetrated by laser of scanner. For increasing the reflector and obtaining high-accuracy 3D model, the flash sliver was coated on organic material’s surface. Flash sliver was found not only increasing the high reflector but also preventing laser penetrating. It indicated that coating flash sliver was an efficient method to obtain high-quality point clouds. These findings have supplied a basis for 3D laser scanner appling to the field of organic material.
The Application of Kalman Filtering on Vessel Positioning System
Authors: Ding Xiong Dong , Chu Guang Qian
Published: December 2012

In the ocean, due to the non-ideal channel environment, it is difficult to locate the position of the vessel in the sea quickly and exactly. In order to improve the location accuracy of accident vessel in the ocean, one method is to analyze the main cause of the different kinds of the measurement errors to find their solutions to decrease the errors. The subject that Kalman filtering technology is applied in wireless location system is researched in this paper, which can reduce the measurement error and greatly improve the location accuracy.
The Study of Equivalent Circuit for Vibrating-Beam-Type Resonant Accelerometer
Authors: Huang Qin Wen , Jia Yu Bin , Fang Wen Xiao
Published: December 2012

Based on the equivalent simplified model of the vibrating beam, the equivalent RLC circuit of vibrating-beam-type resonant accelerometer is described in detail, which shows that equivalent circuit contains a variable capacitances and a variable resistances due to the acceleration. Using the electromechanical coupling factor presented here and the mode function of the transverse deflection vibration of the double clamped beam, the equivalent parameters of the accelerometer with the size of the beam and comb are derived. These results are the bases of designing the drive /sense circuit of the vibrating-beam-type accelerometer.
Design and Realization of Scaled Operations Monitoring and Management Platform of Electric Vehicles
Authors: Sun Guang Ming , Zhang Hao , Zhao Ming Yu , Wang Ying Hui , Wang Gang
Published: December 2012

Introduction the development of electric vehicles at home and abroad, depth analysis of the development characteristics and charging for electric service business model. Determine the functional requirements for the electric vehicles scaled operation monitoring management platform, and then presents a platform design ideas. Abstract layered architecture design of platform according to functional features, the platform is divided into the user layer, application layer, service layer and communication layer, followed concrete realization of every layer, while put forward plug-in design thinking as well as providing the data source service concept, in order to meet users to expand and upgrade requirements for the platform and continue extension of the platform services. Through on-site engineering applications, the platform has achieved satisfactory results.
Output Power Leveling Control of WECS Based on Extended State Observer for All Operating Regions
Authors: Jiang Bo Yu , Zeng De Liang , Liu Ji Zhen
Published: December 2012

This paper designs the pitch controller synthesis to ensure the stability and the controllability in the whole regions as the power grid scheduling instructions. Because of the wind speed measurement and accurate system model are hard to obtain, the range that the actual working point deviating from the balance point is very large, so that the system dynamic performance cannot be described with linear time variable (LTI). This paper utilizes the linear matrix inequalities' techniques (LMI) to design LPV (linear parameter varying) gain-scheduled controllers based on criteria, which provide guarantees of stability performances along the whole reference trajectory. The LPV pitch controller replaces the traditional speed controller to dynamically compensate the pitch angle. According to the errors between the power grid scheduling instructions and measuring the output power, power controller adjusts generator torque to achieve the adjustable power in the whole regions. In view of unmodeled dynamics and wind speed random disturbance, the feed forward linearization. robust pitch regulation using extended state observer (ESO) is proposed to restrain comprehensive disturbances. The proposed controller is seen to be more efficient.
The Study of Improving High Voltage LIGBT Substrate Leakage Current
Authors: Tu Yi Rong , Gong Jeng
Published: December 2012

This paper aims to the research of high voltage lateral insulated gate bipolar transistor (LIGBT) and proposes the design for reducing the substrate leakage current of this device. The junction between LIGBT’s p-type substrate and n-epi layer may have a large electrical field and causes the hole current to flow during the turn-on state. To prevent this substrate leakage current, an n-type buried layer (NBL) and a p-type buried layer (PBL) are used. The double reverse biased pn-junction structure effectively reduces the vertical electric field such that the substrate current is reduced by four orders of magnitude. The break down voltage of the LIGBT is not hurt by this added structure at all.
Unrelated Parallel-Machine Scheduling with Deteriorating Jobs and Rejection
Authors: Hsu Chou Jung , Chang Chia Wen
Published: December 2012

This paper aimed to investigate the unrelated parallel-machine scheduling with deteriorating jobs and rejection. The objective is to find the rejected jobs, the non-rejected jobs, and the optimal non-rejected job sequence so that the cost function that includes the weighted of total load, total completion time, and total absolute deviation of completion time plus the total penalty of the rejected jobs would be minimized. Results showed that the problem is polynomial time solvable when the number of machine is fixed.
A Virtual Physics-Based Approach to Chemical Source Localization Using Mobile Robots
Authors: Zhang Yu Li , Ma Xiao Ping , Miao Yan Zi
Published: December 2012

This paper presents a multi-robot cooperation strategy with virtual-physics force which includes three kinds of effort: structure formation force, goal force, and obstacle avoidant force. For swarm formation, a virtual robot is located at the center of the polygon. The innovative contribution of the strategy is that robots only having two kinds of forces: structure formation force and obstacle avoidant force while virtual robot having one kind of force: goal force. The motion of the virtual robot depends on the goal force which obtained from the sensor observations of the robots. Once the virtual robot moved to a new place, robots would also move with the forces acted on themselves as a single body and maintain a regular polygon formation. Simulation experiments are carried out, and the results show that the proposed strategy can effectively navigate the mobile robotics swarms to the chemical source in an indoor arena.
Current Filtration and Control of Wide-Ranged Speed Regulation AC Servo System
Authors: Bai Long , Zhao Hong Song , Zhou Yuan Jun , Dong Zhi Cen
Published: December 2012

This paper carries research on the methods of wide-ranged speed regulation AC servo system based on the permanent magnetic synchronous motor. The permanent magnetic synchronous motor(PMSM) is a kind of motor with high speed and low rotational inertia, which needs overcoming nonsinusoidal magnetic field，cogging effect and the interference produced by chopper circuit when fulfilling wide-ranged speed regulation. In this paper, the authors analyze the phase current wave of PMSM, and put forth an appropriate type of digital filteration, which is proved true by computer simulation and experimental data.
Simulation on an Experimental System for the Dynamic Characteristics of Safety Valves with High Pressure and Large Flow Rate
Authors: He Xiao Feng , Luo Long Jun , Liu Xiang Lin , Luo Xiao Hui
Published: December 2012

Safety valves play very important role in protecting the safety of hydraulic support in coal mine. However, its development is greatly limited by the corresponding test bench for the dynamic experiment. In this paper, an experimental system for testing the dynamic performance of the safety valve with rated pressure up to 50MPa and rated flow rate up to 2000L/min, is introduced. Based on AMEsim software, modeling and simulation on the designed system is carried out. Some parameters of the system are also analyzed and their influences to the tested valve’s dynamic performance are obtained by simulation. It is found that the designed system, which adopting the combination of a piston and a plunger cylindersas well as accumulators, can fulfill the demands of the relevant standard. Among all the investigated factors, both the volume and pre-charged gas pressure of the accumulators have optimum values matching with the other parameters of the system. The stroke of the plunger cylinder, the rated flow rates of the cartridge valve and its pilot control valve, are required to be higher than a certain value to avoid negative effects on the dynamic performance of the tested valve. The research presented in this paper is helpful to the design of the test system.
A Compact Encryption Algorithm Suited for Resource-Restrained WSNs
Authors: Wu Hong Hua , Lu Chui Wei , Liu Zhi Yuan
Published: December 2012

Wireless sensor is usually tiny volume and powered by battery. So its battery capacity, CPU performance and RAM capacity are all very limited, which lead to sensor can’t afford complex encryption calculation that will cost much resource. The paper proposes a compact encryption algorithm, named CEA, which adopt minor encryption rounds, longer encryption key, improved ciphertext iteration algorithm, and cycle-exchange method to generate child-key. The measurements highly decrease the resource consumation of WSNs comparing to DES algorithm. The experiments demonstrate that the CEA algorithm owns better “avalanche effect” and high security level, furthermore, its calculation speed is far faster than DES algorithm, but cost is very low. The merits of CEA algorithm make it is more suited for resource-restrained WSNs than DES algorithm
Analysis of Damage Efficiency of HPMW on Typical Active Radar Guided Missile
Authors: Guo Han Zhong , He Song Hua , Ou Jianping , Zhai Qin Lin , Zhang Jun
Published: December 2012

The active radar guided missile will be affected by high power microwave weapon. Firstly, this paper builds the seeker damaged model according to the damaged experiment of seeker .Secondly, It also builds the six-degree-of-freedom missile model. The parameter and miss distance are obtained from Monte-Carlo experiments of missile damaged by HPM. The experiments combine the seeker model and missile simulation system. Through the statistics analysis, the result will provide consults for HPMW attacking missile.
Constructing a Hierarchy and Simulation Model to Assess Digital Recorder Sensor System
Authors: Tseng Kuang Jung
Published: December 2012

This work presents group decision making model, following a university safety evaluation to demonstrate the effectiveness of the proposed model. Importantly, the proposed model can assist university decision makers to buy the feasibility of digital recorder sensor system, making it highly applicable for academic and commercial purposes.
Design of Weighing Sensor Used for the Weighing of the Fixed-Quantity Bucket Loader in the Main Shaft Lifting Systems
Authors: Liu Chun Hui , Zheng Feng Long
Published: December 2012

The designed weighing pressure sensor can adapt to the coal mine underground complex environment. The sensor has the characteristics of stimulating the vibration quickly, frequency output stable, corrosion-resisting, easy installation and so on. The design on the structure of exciter and sensor has been introduced in detail. Calibrations of the sensor and error analyses have also been conducted as well as the theoretical formula.
Effect of the Sputtering Presser on Structural and Optoelectrical Properties of ZnO: Ga Films Deposited on Flexible Substrates by DC Magnetron Sputtering
Authors: Wu Xiao Li , Yuan Yu Zhen , Liu Han Fa , Liu Yun Yan
Published: December 2012

Transparent conducting Ga-doped ZnO (ZnO∶Ga) thin films with high transparency and relatively low resistivity have been successfully prepared on ZnO-buffered Polyimide (PI) by DC magnetron sputtering at room temperature. Structural, morphological, stress, optical and electrical proerties of ZnO∶Ga films are investigated. Experimental results show that all the deposited films are polycrystalline with a hexagonal structure and a preferred orientation perpendicular to the substrates along the c-axis. Sputtering pressure plays an important role on the electrical resistivity of flexible ZnO∶Ga films. When sputteting pressure increases from 2 Pa to 6 Pa, the resistivity of the deposited films initially decreases and then slightly increases. At the optimum sputtering pressure of 4 Pa, the lowest resistivity of 4.3×10-4Ω•㎝ is obtained. All the filma present a high transmittance over 90％ in limit spectral range.
Spectrum and Spatial Invariant Based Remote Sensing Image Classification
Authors: Liu Jin Mei , Li Zhong Wei , Wang Guo Yu
Published: December 2012

Multispectral remote sensing images are used as research objects for different band images are highly complementary. Pixel is the basic element for image classification. Spectral information and two order invariant moments are proposed to describe pixel characteristics. The self-organizing feature map neural network is used to realize an unsupervised classification. A fringe area of Qingdao is studied and its classification map is obtained using this method. Experimental results show that the classification accuracy is satisfactory by the proposed method.
Energy Efficiency Analysis of Error Control Techniques of WSN
Authors: Yang Hai Bin , Yao Wu Jun
Published: December 2012

Energy efficiency is the primary consideration of the design of error control protocol of WSN and energy efficiency analysis is the key point of the present related literature research. However, while emphasizes are on the theoretical analysis and experiments are simulated by advanced programming language such as Matlab、C++ and so on, definitions of some restrictive or operation systems on hardware side of sensor nodes in practical usage are neglected, which lead to the inaccurate conclusion of the error control energy efficiency analysis. In this paper, samples of package-loss and error package and distribution of error codes in error packages are obtained through experiment statistics of a large amount of entity nodes and energy efficiency analysis and comparison of Error Control Techniques of WSN are conducted based on error characteristics.
The Application of the Optic Sensor in the Monitoring on the Transmission Lines
Authors: Hou Ya Fei , Ke Rui , Ma Yi , Huang Ran , Deng Wei
Published: December 2012

Three technologies of insulator online monitoring based on optic fiber sensors is described in proposed paper, including optic fiber sensor salt density technology, optical fiber composite insulator monitoring technology and optical sensor insulator surface electric field detection technology. According to measuring insulator surface ESDD, the internal stress and the temperature distribution of the composite insulators and insulator surface electric field values. these technology can monitor the operation performance of insulator. These techniques that improve the existing insulators monitoring methods has a strong innovative and practical application prospects.
Effect of Hardness and Position on Wear Behavior of Steel Pairs
Authors: Li Zhu Jun , Jiang Zheng Wu , Zhou Huan Wei
Published: December 2012

In this paper, the effect of hardness and position on the 40CrNiMoA steel and 18Cr2Ni4WA steel friction pairs’ friction coefficient and wear volume were studied without lubrication, at room temperature. The results show that: Under test conditions, the fluctuation in the friction coefficient is bigger, when the up specimen is the harder 18Cr2Ni4WA steel. And when the up specimen is the softer 40CrNiMoA steel, the fluctuation in the friction coefficient is relatively small. When the up specimen is the 40CrNiMoA steel, the hardness of 40CrNiMoA steel is a relatively small impact on the average value of the coefficient of friction.When the up specimen is the softer 40CrNiMoA steel, the coefficient of friction is relatively larger than that when the up specimen is the harder 18Cr2Ni4WA steel. The wear volumes is relate to the position of friction pair. When the up specimen is the harder 18Cr2Ni4WA steel, both sides of the friction pairs has the same wear volumes when the hardness of 40CrNiMoA steel is about 43HRC. When the up specimen is softer 40CrNiMoA steel, and its hardness is about 54HRC, the wear volumes curves of two materials intersect.
A Reliable Wireless Sensor Network Routing Scheme for Environmental Monitoring System
Authors: Yang Han Hua
Published: December 2012

Monitoring systems can take scientific measurements related to the impact on the environment. In order to attain these first hand measurements from monitored environment, a Reliable Wireless Senor Network Multi Path Routing Scheme (RWMRS) is proposed. Simulation shows that RWMRS scheme can prolong sensor network lifetime by 14.2%, and increase data delivery ratio by 12.1%, which provide better service for environmental monitoring system.
An Improved Ant Colony Optimization RWA Algorithm and its Application in Optical Network Wavelength Converter Allocation Strategy
Authors: Shen Jian Hua , Xu Jian Yong , Chen Jian , Li Yue Hui
Published: December 2012

An improved Ant Colony Optimization based RWA algorithm and its application in optical network wavelength converter allocation strategy is given. The link idle rate is introduced as new constraint along with the random perturbation to prevent searching converged into unexpected local optimum. Theoretical and simulation shows the improved algorithm has better blocking probability and resources utilization performance.
Joint Estimation with Time Delay and Doppler Frequency Shift in the Multi-Carrier Acoustic Communication
Authors: Zheng Jia Chun , Xu Wen , Guo Jianwei , Xie Wei Dong
Published: December 2012

Timing synchronization is very important in the multi-carrier acoustic communication system. With regard to the transmitted signal of the baseband OFDM in the acoustic communication system, which is in the complex environment over the acoustic channel gauss noisy and SαS impulse noisy interference,this paper proposes a joint time delay and Doppler frequency shift estimation algorithm based on the fractional lower order cyclic cross ambiguity function with multi-cycle frequency(FCCAF). This method combines the fractional lower order moment with the feature of cycle stationary, and can detect the signal characteristic of cyclo-stationarity under the SaS impulse noisy. The algorithm takes full advantage of the cycle frequency information of the signal, and can be equipped with the capacity of suppression interference. The simulation results show that the algorithm proposed in this paper can work very well in the presence of the impulse noise and interference, the superior to that algorithm based on the second order cycle fuzzy function, and is a robust joint estimation algorithm with time delay and Doppler shift.
A Collaborative Filtering Recommendation Algorithm Based on Product Clustering
Authors: Wang Pu
Published: December 2012

E-commerce recommendation system is one of the most important and the most successful application field of information intelligent technology. Recommender systems help to overcome the problem of information overload on the Internet by providing personalized recommendations to the customers. Recommendation algorithm is the core of the recommendation system. Collaborative filtering recommendation algorithm is the personalized recommendation algorithm that is used widely in e-commerce recommendation system. Collaborative filtering has been a comprehensive approach in recommendation system. But data are always sparse. This becomes the bottleneck of collaborative filtering. Collaborative filtering is regarded as one of the most successful recommender systems within the last decade, which predicts unknown ratings by analyzing the known ratings. In this paper, an electronic commerce collaborative filtering recommendation algorithm based on product clustering is given. In this approach, the clustering of product is used to search the recommendation neighbors in the clustering centers.
Finite Element Model for Laplace Equation
Authors: Shim Sang Oh , Jung Tae Hwa , Kim Sang Chul , Kim Ki Chan
Published: December 2012

The mild-slope equation has widely been used for calculation of shallow water wave transformation. Recently, its extended version was introduced, which is capable of modeling wave transformation on rapidly varying topography. These equations were derived by integrating the Laplace equation vertically. Here, we develop a finite element model to solve the Laplace equation directly while keeping the same computational efficiency as the mild-slope equation. This model assumes the vertical variation of the wave potential as a cosine hyperbolic function as done in the derivation of the mild-slope equation, and the Galerkin method is used to discretize it. The computational domain is discretized with proper finite elements, while the radiation condition at infinity is treated by introducing the concept of an infinite element. The upper boundary condition can be either free surface or a solid structure. The applicability of the developed model is verified through example analyses of two-dimensional wave reflection and transmission. Analysis is also made for the case where a solid structure is floated near the still water level.
Modeling and Simulation of the Single-Phase Unity Power Factor Active Rectifier for Minimizing the Input Current Harmonic Distortions
Authors: Mapari Rahul Ganpat , Wakde D.G. , Tambe R.G. , Kanase A.B. , Patil Shivajirao
Published: December 2012

This paper presents a modeling and simulation of topology of single-phase AC-DC active rectifier having power factor correction (PFC). This converter topology is evaluated on the basis of performance and its salient features are discussed to analyze its applicability. The technique not only helps to develop a deeper understanding of this converter but also to evaluate performance and feasibility of control strategy and topological features without fabrication of an actual system. This paper also describes technique for minimizing the input current distortion of current-controlled single-phase boost rectifier.
Reliability Design and Wear Extent Determination of a Cam Mechanism
Authors: Ge Yi Yuan , Wang Jun Fa , Wang Gui Lian , Li Ya Qin
Published: December 2012

The application of the cam mechanism is an important field in agricultural machinery since it can realize complex mechanical movement. The wear extent and action reliability of the cam affect the performance and accuracy of the mechanism. The paper combined reliability optimal design and tribology to build a fuzzy optimization model, with minimum of the cam base circle radius and minimum of the maximum contact stress as the objective functions. Compared with conventional optimization, the cam weight was reduced by 11.7%, the stress was increased by 1.96%, and the reliability increased 0.71%. Contrast tests were designed to determine the wear extent before and after optimization. The results prove the feasibility of optimization.
Study of the Dynamic Behavior of Face Gear Transmission System
Authors: Wang Zhi , Chen Qing , Lin Jia Chun , Yang Li Li
Published: December 2012

According to the gear meshing theory, the tooth surface equation of orthogonal face gear is derived and the mathematical model is established. Also the model was provided for simulating the bevel gear transmission system concerning the time variant stiffness and face gears errors under static load and cyclic loads. Through the model the computerized analysis of speed, angle and acceleration of gear real tooth surface could be accomplished. Rattle as discussed under condition of different static loads and the constant cyclic loads.
Computational Analysis of Stress Field and Contact Pressure for Rubber Seal Based on Non-Linear Finite Element
Authors: Sang Jian Bing , Sun Li Fang , Xing Su Fang , Zhang Dong Ling
Published: December 2012

This paper aims to research on the sealing capability of rubber seal by utlizing non-linear finite element analysis. After discussion on various types of strain energy functions of rubber like materials, material parameters of Mooney-Rivilin model are determined by curve fitting based on the stress strain curve from the uniaxial tensile experiment. Axis symmetric and isotropic finite element model is developed to analyze the stress field and contact pressue of O-ring seal and lip seal at different medium pressure. Von-mises stress distribution rule and contact stress distribution curve on contact surface are achieved. The results show that maximum Von Mises stress increase with the increases of oil pressure. The maximum contact stress appears on the middle contact zone and the maximum contact stress and contact width increases obviously with the increases of oil pressure. In the meanwhile, the maximum contact stress is greater than midum pressure which can prevent the leakage of midum and achieve the function of sealing. The research results will be a useful technique for predicting the properties of rubber seal and providing reference for engineering design.
Influence by Casing Geometric Imperfection on Anti-Collapse Strength with Finite Element Calculation
Authors: Xue Ji Jun , Wang Peng
Published: December 2012

This essay was to build a finite element model to find the influence by oil casing geometric imperfection on anti-collapse strength. Two types of oil casing, Ф177.8×10.36mm/P110 andФ127×9.19mm/ P110, was taken for the calculation, considering the influence on anti-collapse strength by casing with two elements separately, ovality and non-uniformity of wall thickness. The calculation show that the anti-collapse strength of perfect casing perform better than that of imperfect casing. Ovality is an important factor for the anti-collapse strength, and the anti-collapse strength decrease rapidly as the ovality increase. Non-uniformity of wall thickness is the less important factor for anti-collapse strength, and the anti-collapse strength decrease slightly and slowly while the non-uniformity of wall thickness increase.
Influences of Main Parameters on Performance of Seed-Filling Device in Plot Seeder
Authors: Liu Shu Guang
Published: December 2012

Seed-filling device of plot seeder is the research object. Influences of the four test factors (motion velocity (v), rotation speed of filling device (ω), generatrix length of seed-filling device (l), base angle of seed-filling device (α)) on the uniformity in seeding-filling process for wheat seed are analyzed by DPS7.05. The effect order of four test factors on wheat seed is obtained. Optimum parameters for wheat seed established are as follows: motion velocity of plot seeder 0.4m/s, rotation speed of seed-filling device 0.25rad/s, generatrix length of seed-filling device 0.1m, base angle of seed-filling device 50º. The best plot length for the seed-filling device is 10m and the best CV in seed-filling process for wheat seed is 7.85% when seeding rate for wheat seed are 180g per plot.
The Gear Modification of Wind Gearboxes High-Speed Gears on Romax Software
Authors: Liu Dan , Li Xiao Long , Wang Chun Xiu
Published: December 2012

Abstract: Objective to acquire reasonable modification methods and values, and provide reference for gear modification of wind gearboxes. Methods the parallel level model of a MW wind gearbox is constructed which based on Romax software. To simulate the modification of high-speed gears under the method of profile modification, end relief, helical angle correction, lead crowing. Results According to the distribution of load on the tooth surface, acquired corresponding value. Conclusions Romax software greatly increase productivity, and it is a good platform for research on gear modification.
Electric Characteristic of Steel-Making Electric Furnace and the Process Control
Authors: Sheshukov Oleg Y. , Nekrasov Ilya V. , Syvtsov Andrey V. , Tsymbalist Mikhail M. , Stepanov Aleksandr I. , Egiazar’an Denis K. , Kataev Vladimir V
Published: December 2012

The article gives analysis of long-term and perspective tasks of automating EAF, particularly relevant to the conditions of domestic production. The results of studies on quality control of foaming slag in the super-power EAF-135 OJSC "Seversky Pipe Plant" are shown. We made the conclusions about the possibilities of using the electrical mode parameters for the operational control of the processes of smelting steel and ferroalloys.
A Review of Static Synchronous Compensators (STATCOM)
Authors: Ma You Jie , Li Yi , Zhou Xue Song
Published: December 2012

This paper reviews the development of static synchronous compensator (STATCOM), and analylizes the structure of its main circuit, its working principles and control strategies. At last, this paper comes to a conclusion of technical characteristics of STATCOM and outlook of its development trends. Fast acting STATCOM, a representative of FACTS family, is a promising technology which is extensively used as state-of-the-art dynamic shunt compensator for reactive power control in transmission and distribution system. STATCOM controller employs various solid-state converter topologies, magnetics configurations, control algorithms, and switching techniques and so on. The development of STATCOM controller has been well reported in literature with its versatile application in power system. Thus deep investigation of STATCOM from the perspective of its intelligent control and the configuration of STATCOM’s main circuit is valuable.
The Linkage Analysis of Electric Load Characteristic Statistical Indexes Based on VAR
Authors: Zhou Xie , Ma Rui , Liu Dao Xin , Wang Zi Jian , Wang Jun , Xu Hui Ming , Wang Xi Liang
Published: December 2012

Based on the present problems existed in electric load characteristic statistical indexes, a correlation analysis method for load characteristic statistical indexes is proposed in this paper. Low-level correlation indexes are extracted by using correlation analysis, then the linkage analysis theory in econometrics is applied and the load characteristic indexes are analyzed by using vector auto-regression model. The Synchronous movement trend and causal leading relationship among electric load characteristic indexes are confirmed by co-integration test and granger-casualty analysis. The purpose of this paper is to help power decision makers grasp the alteration situation of load characteristic indexes comprehensively and analyze correlation indexes accurately, so it can enhance the monitoring, forecasting and early-warning function of electric system.
Research on a Dynamic Binary Stack Anti-Collision Algorithm
Authors: Yi Jian Jun , Luo Fei , Chen Shao Li , Ji Bai Yang , Yan Hai Xu
Published: December 2012

RFID anti-collision technology is one of a key technology in RFID application system. Anti-collision algorithms for RFID systems include tag anti-collision algorithms and reader anti-collision algorithms. This paper focused on the impoved binary algorithm and dynamic binary algorithm. An improved algorithm has been proposed, in which the collision bits was put into the stack and they were used as the reader’s request. Based on this mechanism, a novel binary stack algorithm has been proposed. Its simulation was given to analyze the performance of this algorithm. The simulation results showed that the amount of transmitted data in proposed algorithm was obviously less than those in the other two traditional algorithms with the number of tags and their bytes increasing. Consequently, the performance of the proposed algorithm is much better than that of the traditional anti-collision binary algorithm.
Surface Structure and Protein Resistance of PMMA/PS Copolymer Coatings
Authors: Zhang Xu Ming , Zhang Yu , Jin Guo , Li Li
Published: December 2012

PMMA/PS copolymers were synthesized by radical polymerization techniques. And the 1H NMR results illustrate that the molar contents of PMMA are respectively 19%, 53%, 69% and 84%. The coatings of those PMMA/PS copolymers were prepared by spin-coating. The surface structures and protein resistance of copolymer coatings were investigated respectively by AFM and BSA absorption experiment. It is showed that the copolymer coating surfaces have micro-phase separation structure. Furthermore, with the increase in the PMMA content, the surface pattern changes from interpenetration network pattern to island structure that the PMMA-rich phase surrounded by the PS-rich phase. In addition, all coatings prepared in this study, especially the coating with PMMA content of 69%, have good resistance to BSA protein.
Second Development of Keller Based on Double-Arc Method
Authors: Chen Yan , Zhu Lin
Published: December 2012

Keller SYMPlus CNC is developed by Germany Keller software company, which has powerful simulation function of NC machining. Based on the current Keller software (version 5.1) can't simulate and machine noncircular curve ,only can machine circular arcs and straight lines.This article uses telescopic step method and double-arc method simulation noncircular curve, then impo- rts DXF into Keller, finally realizes the machining and simulation of parts with non-circle curve.
Research on Vacuum Consumable Arc Remelting Furnace Drop Testing System for Thyristor Power Supply
Authors: Lv Guo Yun , Hu Shui Xian
Published: December 2012

Stable and reliable automatic control system of Vacuum Consumable Arc Remelting (VAR) furnace with thyristor power supply is the key to smelt successfully special alloy metal and high temperature alloy metal, which is related to special properties of remelting ingot directly, however, it is key problem to test the drop pulse for thyristor supply. This paper makes a deep study for drop short pulse testing system on AVR with thyristor power supply, and digital signal processing is used to obtain drop short pulse value with different frequency ranges. According to the specification of thyristor power supply, firstly, basic theory analysis of drop short pulse measuring is researched. Secondly, high-speed digital signal processing technology is adopted to sample furnace voltage signal real-timely, trap filter group is designed to remove the multiple order harmonic, and band pass filter group is designed directly to process and calculate the amount of drop short pulses in different frequency ranges, finally, the material parameters which impact on drop short frequency. Field experiment results show the effectiveness of the whole drop short pulse testing system.
Rotor Vibration Control of Active Magnetic Bearing System Using Adaptive Forced Balancing Method
Authors: Zhang Tao , Ni Wei , Wu Sha Sha , Zhang Hui Ping , Ji Jian Xiang
Published: December 2012

The adaptive forced balancing (AFB) method was used to estimate and eliminate the rotor vibration with unknown amplitudes and frequencies in active magnetic bearing (AMB) feedback control systems. Firstly, the rotor vibration producing mechanisms of AMB were analyzed. Then, the AFB under the assumption of unknown rotational frequency and amplitude are designed. Finally the simulation results show that the AFB method proposed in this paper makes it possible to completely reject unknown sinusoidal disturbance in a closed loop control system
Cartesian Impedance Control for Space Robotic Arm Based on End Force/Torque Sensor
Authors: Dong Xiao Xing , Li Ge , Liu Geng Feng , Zhao Jie
Published: December 2012

A Cartesian impedance control for a 7-DOF space robotic arm (SRA) based on the feedback from a 6-dimensional force/torque sensor on its end effecter is presented in this paper. The unavoidable position error of SRA would generate large contact forces during the connection between SRA’s end effecter (EE) and grapple fixture (GF). To control the contact force we used 6D force feedback to modify the desired trajectory controlling a PID position inner loop to make the manipulator exert desired impedance dynamic properties on its end-effecter. After optimization of impedance parameters in Simulink, this control strategy has significantly improved the force control effect in EE/GF connection experiment. Kinematic solution of the 7-DOF redundant manipulator is also provided.
Study on the Degree of Strain Uniformity of a new FBG Accelerometer
Authors: Shao Jun , Jia Zhen An , Liu Jun Hua
Published: December 2012

A new elastic element of fiber Bragg grating accelerometer which is four peripheral clamped trapezoidal beams is developed. On the basis of analyzing the mechanical condition of this elastic element, the theoretical model is obtained. Furthermore, the degree of strain uniformity of the beam will be discussed. The elastic element has nearly uniform stain near the fixed end , where can be as grating area. This kind of elastic element not only can be used with fiber Bragg grating accelero- meter, but also other types of sensors.
Ag Doped Co3O4 Nanowire Arrays as an Electrode Material for Electrochemical Capacitors
Authors: Xu Yang , Huang Ji Chun , Cheng Lin , Cao Dian Xue , Wang Gui Ling
Published: December 2012

Co3O4 nanowire arrays freely standing on nickel foam are prepared via a template-free growth method，and it is doped by Ag via electrodeposition method (denoted as NWA-Ag/Co3O4，NWA represents Nanowire Arrays). The morphology of NWA-Ag/Co3O4 is examined by scanning electron microscopy. The phase structure of the NWA-Ag/Co3O4 electrode is characterized by X-ray diffraction spectroscopy. The supercapacitance behavior of the NWA-Ag/Co3O4 electrodes is investigated by cyclic voltammetry, galvanostatic charge/discharge test and electrochemical impedance spectroscopy. The results show that the nanowire arrays densely cover the nickel foam substrate and have diameters around 250 nm. The NWA-Ag/Co3O4 electrodes exhibit a specific capacitance of 1009 F g−1 at a current density of 5 mA cm-2 in 6.0 mol dm-3 KOH electrolyte. The capacitance loss is less than 6.5% after 500 charge/discharge cycles at 10 mA cm-2 and with columbic efficiency higher than 97.5%.
The Study on Detecting Failure in the Metal Beam Based on AE Parameters
Authors: Zhao Mei Yun , Kang Xiao Ni
Published: December 2012

Fatigue fracture is the main style of failure in the metal beam under variable load and the formation of cracks is often the omen of breakage. The detection of cracks ahead is of important significance to prevent the production of vast defect and safety accidents. Loading experiments were performed on metal beams with artificial defects, the Acoustic Emission (AE) signals were extracted in the loading process. The methods like tabulation, the experience diagram analysis, distribution analysis and correlation analysis are respectively used to analyze events, ringing counts, energy counts, maximum amplitude, rise time and duration of AE characteristic parameters. Results show that the method of AE parameters analysis is not only able to capture in real time the development of fatigue cracks, but also fix the preliminary position of the cracks. So it is feasible to detect defects of the metal beam by AE technology.
Real-Time Monitoring of Acetaldehyde in Air by Cataluminescence-Based Gas Sensor
Authors: Zhou Kao Wen , Gu Chun Xiu , Ma Dong Ping , Cao Hui
Published: December 2012

A highly sensitive, simple and selective gas sensor was developed for the determination of trace acetaldehyde in air based on cataluminescence (CTL) on nano-sized Al2Ti2O7. The gas sensor showed high selectivity for acetaldehyde at 515 nm and satisfying activity at 295°C. The linear range of the CTL intensity versus concentration of acetaldehyde was 1~65 mg/m3, and the detection limit (3σ) was 0.5 mg/m3. No interference was observed while the foreign substances, such as ammonia, ethanol, formaldehyde, benzene, carbon monoxide and sulfur dioxide, were passing through the sensor. The gas sensor displayed good stability for continuously introducing 10 mg/m3 acetaldehyde over 60 h, and allowed real-time monitoring of acetaldehyde in air.
Research on XML Based Flexible Web Application Design
Authors: Zhou Chuan Sheng
Published: December 2012

During web applications developed and deployed in many and many enterprises today, how to make sure their web applications satisfied to their individual and specific business requirements and marketing changes has been become a major problem. As now a lot of web applications are only designed and developed for specific business and they are normally high-coupled together with very bad system opening, collaboration, and flexibility. Here, by research on XML based web application design with software bus, component and workflow technologies, with multiple tiers layout and from user interface flexibility, business flow flexibility and data model flexibility, it illustrates a new way for a flexible web application design and try to improve web application flexibilities and to enhance enterprise satisfaction to their applications meeting with their business and marketing changes.