bluuebunny/crossref_metadata_2025 huggingface dataset:
Selection of the Intelligent Power Distribution Cabinets for the Computer Room of Video Monitoring Data Center
Authors: Chen Peng , Hu Ping
Published: September 2013

Along with the increasing investment in the construction of large-scale data centers as well as operation centers, the users of the data centers have begun to encounter all sorts of difficulties in safety, energy consumption, and automated management. Computer room is the core of the whole automated construction and its establishment rationality, areas, and extensibility have a close tie with the maintenance and flexibility requirements of computer room. Under the demand of users, how to select the most appropriate intelligent power distribution cabinet for the computer room of video monitoring data center has become very important. In this paper, the functions of intelligent power distribution cabinet in computer room are analyzed from the perspective of user demand, and then how to select the most appropriate intelligent power distribution cabinet products is discussed.
Thermal Analysis of a Fluid Immersed Brushless DC Motor for Aerospace Applications
Authors: Chen Wei , Huang Xiao Yan , Ma Jien , Fang You Tong
Published: September 2013

In this paper, the thermal behavior of a 12kW, 12000rpm, wet-type Permanent Magnet Brushless DC motor (BLDC) with skydrol oil inside designed for electro-hydraulic actuation system (EHA) was analyzed. A 3-D computational fluid dynamics (CFD) model has been built. The influence of skydrol hydraulic oil in thermal behavior at both low-speed and high-speed conditions was discussed. The results confirm that the skydrol oil passing through the motor has different impact on the thermal performance in different conditions.
Radar Orthogonal Frequency Division Multiplexing Waveforms Agility Processing with Compressive Sensing
Authors: Xie Feng , Liu Feng , Ye Xiao Hui
Published: September 2013

CS is a very new method that is being evaluated for many applications, in which signals are sparse in some basis/dictionary, e.g. the radar range profile. In this article, we have formulated the range processing with CS and introduced fair comparisons between matched filter and CS with chirps and OFDM signals. Two relevant features have been inspected: waveform bandwidth and measurement matrix.
Online Rebar Recognition Based on Multi-View Images
Authors: Fang Hong Ping , Fang Kang Ling , Liu Xin Hai
Published: September 2013

Accurate rebar recognition is a key step of automatic online rebar counting based on image processing. Current popular rebar recognition methods based on front view image usually lead to missing detection for some special rebar such as obscured rebar, oxidation dark rebar and bent rebar. So a novel rebar recognition method based on multi-view images was proposed in this paper. Firstly, rebar images were captured simultaneously from front view and top view using two cameras. Then, the centers of rebar were located respectively in top and front view image. Finally, in the image fusion step, the top recognition result was used to compensate and validate the front recognition result for reducing and eliminating above missing detection. Experiments showed that this method can efficiently recognize above missed rebar and improve rebar recognition rate.
Structural Optimization of Double-Secondary PMSLM Based on Spatial Harmonic Suppression
Authors: Chen Pan Pan , Zhao Ji Wen
Published: September 2013

In view of that detent force (DF) spatial harmonic has great influence on thrust ripple of permanent magnet synchronous linear motor (PMSLM), a harmonic suppression method is proposed. DF of the PMSLM model is calculated by finite element method (FEM) and its harmonic spectrum is achieved by Fourier transform (FT). Also total harmonic distortion (THD) is introduced to quantificat spatial harmonic. The effects of air gap, permanent magnet (PM) size, primary size, secondary size and pole-arc coefficient upon DF are analyzed. In order to minimize THD, orthogonal optimization design is adopted to optimize PMSLM structural parameters. A double-secondary PMSLM is chosen as the subject of research in the paper. Based on quantitative calculation, orthogonal experiment and range analysis are used to obtain optimal structures. This paper provides an effective quantitative analysis method for PMSLM spatial harmonic suppression.
Dual K-Type Ridge Estimation of Inverse Problem with Morbid Equality Constraints
Authors: Ma Chao Zhong , Fu Ji , Du Yuan Lu , Gui Qing Ming , Gu Yong Wei
Published: September 2013

Based on non-precision observation, it researches the inversion problem with morbid equality constraints. And according to the pathological problems exist for the coefficient matrix and the constraint matrix, and it suggests the ridge estimation of the double-k type derived Ridge to determine these parameters. The results show that a variety of programs and double k ridge estimate not only removes the constraint matrix morbid adverse effects, but also can better overcome the master model morbidity and constraint matrix caused by the presence of instability, which is a good estimate.
Research and Implementation of Speaker Recognition System
Authors: Cui Bang Jun
Published: September 2013

language is the most natural to pass information, the most effective and most convenient method, at the same time, because everyone there are differences in pronunciation organs and habits, by the speaker's voice to identify the identity will make process more convenient and effective. Its application can not only make the system of information security has been further guaranteed, you can also bring great convenience to users, increase the economic benefits of system operator. This paper first introduces the principle and the research of speaker recognition system, and then discussed the pretreatment of the feature parameters in speaker recognition system and the feature extraction process, finally discusses the implementation results and the test of speaker recognition system, shows that the system run correctly, the performance good, to achieve the desired effect.
The Design of Embedded System Based on DaVinci DSP6467
Authors: Ma Dong Tao
Published: September 2013

For application requirements of smart multimedia system, the paper design and implements system application framework and describes the function of each software module in the whole system. After description of the overall framework,paper analyze detailed implementation of several key software modules,that is supports SD and HD video signal, video capture module, object intrusion alarm motion detection module, audio and video multimedia processing synchronization mechanism, and web-based remote control module. And the article describes the main features of the DaVinci technology and DaVinci technology platform development, elaborated the DSP6467 DaVinci platform hardware structure which used in this paper.
An Automotive Airbag Detection Method Based on Image Processing
Authors: Shao Xiang Xin , Xie Mu Jun
Published: September 2013

The development of the automobile industry led to the development of auto parts, and airbags are one of the most important safety components of cars. In this paper, to meet the shortfall of traditional way of using a dial indicator to detect airbags deficiencies, a new automotive airbag shape detection methods based on image processing technology is put forward. First, extract the airbags image edge information using the method of boundary tracking, then detect whether airbags are qualified according to the similarity of image invariant moment. Experiments confirmed this method can improve the range and accuracy of the airbag detection.
The Regularization Method Based on Complex Collinearity Diagnostics and Metrics
Authors: Ma Chao Zhong , Gu Yong Wei , Fu Ji , Du Yuan Lu , Gui Qing Ming
Published: September 2013

In a large number of measurement data processing, the ill-posed problem is widespread. For such problems, this paper introduces the solution of ill-posed problem of the unity of expression and Tikhonov regularization method, and then to re-collinearity diagnostics and metrics based on proposed based on complex collinearity diagnostics and the metric regularization method is given regularization matrix selection methods and regularization parameter determination formulas. Finally, it uses a simulation example to verify the effectiveness of the method.
Design and Research on Intrusion Detection System in the Computer Network Security
Authors: Sun Yu Tao
Published: September 2013

This paper first discusses the information security and network security, security threat, hacker intrusion process, system and network security vulnerabilities, and then introduces the status of intrusion detection system. By the comparison of two kinds of intrusion detection systems, the article puts forward the detection system based on the combination of the soil and the intrusion of network intrusion detection technology. Combined with the actual project development, this article focuses on the key technology design idea and the realization of the intrusion detection system in network security.
Study on the Design of Trusted Secure Cloud System Structure
Authors: Wang Xue Li
Published: September 2013

The ordinary cloud system is confronted with various threats in trust and security perspective, which have influenced the extensive use of cloud system. Aiming at the defects in the trusted secure design of the ordinary cloud system frame, a trusted secure cloud system has been designed.
Discussion on the Software Engineering Data Modeling in OWL
Authors: Yang Yuan
Published: September 2013

Web ontology language, which is discussed usually by people, is abbreviated as OWL. Actually, it specifically refers to the computer Web ontology language, namely a type of computer machine language. OWL is one of the very important components composing semantic Web technology. It is an ontology language that is recently offered by W3C especially for Web language, and its ontology working group makes a description to OWL through a series of documents. OWL is applicable to the description and modeling on the semantic aspects of complex data, and it can establish a flexible semantic model when a lot of complicated structures and rich semantic data are often derived in the development process of software system. All software engineering data systems are managed in modes. OWL, as an ontology language, has been widely valued in the IT industry. However, the development of OWL has been seriously restricted because it is difficult to understand.
Hybrid Combination of Machine Translation with Part-of-Speech Analysis
Authors: Hu Xiao Xu
Published: September 2013

Hypothesis combination is a main method to improve the performance of machine translation (MT) system. The state-of-the-arts strategies include sentence-level and word-level methods, which has its own advantages and disadvantages. And, the current strategies mainly depends on the statistical method with little guidance from the rich linguistic knowledge. This paper propose hybrid framework to combine the ability of the sentence-level and word-level methods. In word-level stage, the method select the well translated words according to its part-of-speech and translation ability of this part-of-speech of the MT system which generate this word. The experimental results with different MT systems proves the effectiveness of this approach.
Research on Wireless Communication Technology Based on Cooperative Diversity
Authors: Sun Xiao Jin , Hu Zhi Wen
Published: September 2013

Cooperative diversity technique refers to that in the context of multi-users, several single antenna terminals create a virtual multi-antenna system to realize the dispatch and diversity of the periodic line by means of share each others antenna. The remarkable strong point of the cooperative diversity technique is that it can reduce the transmission power of the system, improve its handing capacity and effectively decrease its error rate. This paper is going to analyze the application of the cooperative diversity technique on the wireless communication technology and present the main problems of the cooperative diversify technique by introducing the related conceptions of the cooperative diversity technique.
Analysis of the Application of Soft-Switch Technology in Mobile Communications
Authors: Ouyang Wei Hao
Published: September 2013

With the rapid development of mobile communication, the demand for the security and reliability of mobile communication becomes increasingly higher. The major operators are all continuing improving the operation mode in order to reduce operating costs to achieve maximum economic benefit. If the development demands are to effectively unify, they can be accomplished through the advanced network technology and switching technology. The following will explore the application of Soft-Switch Technology in mobile communication according to the authors work experience and professional knowledge. There are many shortcomings, and I also hope for criticism.
A Wireless Mesh Network Node Query Method Research
Authors: Wang Zhi Gang
Published: September 2013

In the wireless mesh networks, identification of nodes does not need to set the address, only take the manufacturing time of the node as the sequence to identify. Nodes in the query and data transmission adopt a master - slave mode. The center node initializes slave-node according to the node of the manufacturing time sequence, through the search command, search to find the slave-node. The newly found node recursive search is for the next batch of nodes. Eventually form a wireless mesh network. Center nodes and the nodes of data communication are made by mesh network.
Study on the Influence of Nonlinear Effect on Pulse Trapping in Photonic Crystal Fiber
Authors: Yang Min , Li Song Bai , Xia Kai
Published: September 2013

Based on the nonlinear Schrödinger equations which can satisfy the optical pulses transmission in photonic crystal fiber, it is numerically simulated the pulse t rapping courses between the pump pulse in negative dispersion region and the signal pulse in positive dispersion region using step by step Fourier method, and the effect the nonlinear coefficient to the trapping course. The result shows if the nonlinear coefficient is small, the pulse trapping cant realize. Conversely, if the nonlinear coefficient increases, the cross phase modulation between the two pulses is enhanced and the frequency shifts are intensified too. When the group velocity is matched, the pulse trapping is realized. And the degree of trapping is strength accompany with the nonlinear coefficient increasing.
Study on the Limit Value of the Spandrel-Braced Stone Arch Bridges
Authors: Kang Cheng
Published: September 2013

In this paper, the safety evaluation model and limit indexes of a stone arch bridge in the Three Gorges Reservoir region are studied. Specifically, the permanent deformation limit indicators of the bridges are studied; the safety evaluation msodel and limit indexes of a stone arch bridge in Three Gorges Reservoir region are identified based on the practical disease test. A scientific criterion is provided for the vast number of the engineering technical personnel at the grass-roots level to easily and effectively judge if the locally-deformed stone arch bridges can conform to new specifications and requirements, so this study is of important social significance and practical engineering value.
Modified Duncan-Chang Model Considering Physical Properties of Saturated Clays
Authors: Wang Xing Chen , Xu Ri Qing , Qian Jing Lin
Published: September 2013

A series of undrained triaxial compression tests of saturated clays under different conditions were performed to study whether it is possible to determine parameters specifying Duncan-Chang model simply by using the physical parameters. The test results show that both the initial tangent modulus and peak deviatoric stress decrease with increasing initial void ratio and plasticity index of the soil under the same confining pressure. Whereas, they increase with increasing confining pressure of the soil with the same initial void ratio and plasticity index. A new synthesized physical parameter λ is defined based on the test results in this work. The functional relationships among the parameters K, peak deviatoric stress in Duncan-Chang model and the parameter λ are established to develop a modified Duncan-Chang model by considering physical properties of soil. In this model, only two input parameters, i.e., λ and the damage ratio Rf, are needed to predict the stress-strain relationships of the soil. In order to check the accuracy of the proposed model, laboratory tests were conducted to evaluate against the predicted results. The results show that the stress-strain relationships of saturated clays can be well described by the proposed model.
Research on the Legal Claim in Large-Scale Mechanical and Electrical Engineering in Construction Project
Authors: Zhou Wen Fang
Published: September 2013

Research on the claim is based on the contractor's claims for compensation to the owner, however, the legal status of the owner and contractor are equal in the construction project. The contractor has the right of claim to the owner. The owners also claim for compensation to the contractor. However, the owner's claim is not a simple matter. In this paper, from the legal basis for claims, by studying the theories about contract and claim, combined with the characteristics of large mechanical and electrical engineering project, the author preliminarily discusses the theoretical system of the owners claim in mechanical and electrical engineering project and its solutions which has a certain theoretical and practical significance.
Formula SAE Racecar Suspension System Design
Authors: Li Jie , Yu Shan Hu , Zhang Nan Feng , He Hua , Yang Zhi Jian , Jia Yu Mo
Published: September 2013

For racing application, what actually counts is the wheel path during bump and the consequently change of wheel parameters like camber. The suspension system mainly comprises of the elastic components (springs), shock absorbers and control arms. This paper covers: Firstly, the selection of the suspension type of a FSAE racecar. Secondly, how to determine the hard points of the suspension system according to the general envelop of the racecar. Then the 3D-modeling and assembly of the suspension system will be done using Autodesk Inventor; With the results from the kinetic and dynamics simulations using ADAMS, adjustments or amendments will be done to the system to optimize the change of parameters in bump and roll; At last, according to the results of the FEA processes, the structure of the control arms, uprights, rockers, etc. will be optimized so that the stress of each components within strength limitations. Finally, optimize the suspension assembly and make sure it meets the practical requirements.
Study on the Trajectory Simulation of the Ballistic Missile
Authors: Wang Hong , Tong Chuang Ming , Sun Jia Jia
Published: September 2013

Based on the geocentric coordinate system, the object coordinate system as well as the theory of elliptic trajectory, it makes research and analysis of the ballistic-parameter-based trajectory generation method of the ballistic missile and, meanwhile, verifies the effectiveness and rationality of this method. It, under the assumed condition of elliptic trajectory, also researches the solution process of the ballistic parameters in the midcourse of the ballistic missile and, meanwhile, makes the simulation verification on the midcourse trajectory of the ballistic missile according to the radar sights variation relation in the object coordinate system during the motion process.
Research on the Ballistic Model and Simulation of Sensing Reconnaissance Submunition in Falling Stage
Authors: Li Jun , Li Yun , Zhang Zhi Yuan , Liu Guang Sheng
Published: September 2013

To analyze the ballistic characteristics of sensing reconnaissance submunition in falling stage, the dynamic characteristics of sensing reconnaissance submunition is analyzed. Based on force bearing analysis, the particle ballistic model of the reconnaissance submunition in falling stage is built, and the ballistic data is simulated. The results are basically consistent to the result of live fire test, and it can be used to better simulate ballistic characteristics of the submunition. The results can be used to refer to conceptual design and determinate the fire data.
Regulation of Bolt Stamping Process
Authors: Wu Yao Hua
Published: September 2013

through the analysis on the regulating bolt technology, the stamping blank instead of casting blank solution, introduces the calculation method of process, introduced the die structure and working process, and the problems in production, puts forward the solving measures.
Study on the Correlation of Shallow Source Earthquake and Mine Dynamic Disasters in the Weast of Beijing
Authors: Lan Tian Wei , Zhang Hong Wei , Yu Jian Yang , Han Jun
Published: September 2013

Mine dynamic disasters is due to a sudden release of energy by mine engineering disturbed. Shallow-focus earthquake is due to plate movement caused by sudden release of energy. In this paper, on the basis of plate tectonics, geophysical, In this paper, on the basis of plate tectonics, geophysical, through the shallow source analogy is the mechanism of dynamic disaster, earthquake and mine exploration seismic energy result in mine power. The mechanism of disaster analysis seismic energy has the possibility of mine dynamic disaster, combining shallow-focus earthquake and the mine dynamic natural disaster site scheduling, and shallow-focus earthquake and the mine dynamic disasters of space position relations. Analysis in complex geological conditions shallow-focus earthquake geological structure as the first energy transmission medium for mine power disaster role relationship, for the prediction of mine dynamic disaster and the effective prevention and control provides the basis of the production test.
A Research on the Characteristics of Lightning in Hailstorms of Beijing Area by the Method of Analysis the Lightning Detection Data and Numerical Simulation
Authors: Zhang Chuang Chuang , Ma Ming
Published: September 2013

In this paper, by using lightning detection material of Beijing area, we analyzing the characteristics of lightning in four hailstorms. The results show that the mean percentage of cloud-to-ground (CG) lightning accounting for the total lightning is 8.28%, which is lower than the normal thunderstorms. On the contrary, the CG lightning has a higher proportion of positive CG than the normal thunderstorms. All cases variation trend of lightning frequency show a conspicuous intensive increase before the hail reaches the ground. The peak lightning frequency usually occurs 5 to 80min earlier than hailstone falling. These characteristics may have contribution to the forecasting of hailstorms of Beijing area. Another work was done by using a two-dimensional numerical model which includes dynamic, microphysics, electrification and discharge to simulate these four instances. The results present similar characteristics with the actual detection data. This will lay a foundation for the continuing studies of the relationship between hailstorm and lightning and the inherent reason of the relationship by using the method of numerical simulation.
Research on the Talent-Post Matching Model of Material Warehouse Based on Support Vector Machine
Authors: Wang Shu Ai , Zhou Qing Zhong , Yong Qi Dong
Published: September 2013

The purpose of the article is to solve the talent-post matching problem of material warehouse. From basic quality, job quality, ability quality 3 respects, the index and standard of talent-post matching degree was analyzed. The talent-post matching model of Material warehouse was build by using the method of support vector machine. An example of verification was given. The results show that the model can accurately evaluate the talent-post matching degree and has very important significance on the management of human resources of Material warehouse.
Application of Cable Grading Perforating Technology in the Oil Field
Authors: Liu Zheng Yan , Zhang Feng , Zhang Song Qiao , Yang Xue Gui , Wang Xue Yan
Published: September 2013

The cable grading perforating technology is a segmental perforation technology used in oil and gas wells, particularly suitable for the perforation development of shale gas horizontal wells. The cable grading perforating technology takes use of multi-level gun string structure, perforating in the three-core cable conveying way, connected the ground monitoring instrumentation, perforating gun and graded perforation initiation control device by cables, to achieve the purpose of grading perforation. This technology has practically applied in Daqing Oilfield, after several times onsite tests, obtained the success of application of the cable grading perforating technology.
Analysis and Optimization of Starting Characteristics of Tubular Linear Induction Motor
Authors: Yan Ling Yun , Ye Ding Kuan , Zhang Xin Min , Shen Xun , Ye Yun Yue
Published: September 2013

Traditional mechanical punching machines are mainly driven by rotary motors and a complete set of intermediate transformation mechanism is needed, which results in a reduction of the system efficiency. This paper focuses on the tubular linear induction motor (TLIM) with low cost and simple control structure which directly drives the punching machines. In order to provide a theoretical basis for its further control system, the finite element model of this TLIM is established. The starting performances, such as the trust force, phase current, velocity, displacement and the load force, are analyzed by the finite element analysis (FEA). Moreover, the optimization of the starting trust force is investigated.
Influence of Actuator Reluctance Force on Linear Oscillating Systems
Authors: Chen Xuan , Zhu Z.Q.
Published: September 2013

The operation of linear oscillating system is complicated, involving system nonlinearities of both actuator and load, and variations of driving frequency in order to track the mechanical resonance. In this paper, the state-variable modeling technique is used to analytically investigate the influence of actuator reluctance force on the performance of linear oscillating systems. The analytical derivations will be validated by simulations, and good agreements are achieved.
Research on Combinations of Primary and Secondary Pole Numbers for Linear Switched-Flux PM Machines with Odd Pole Number of Primary
Authors: Li Yan Xin , Lu Qin Fen , Chen Jin Tao , Zhu Z.Q.
Published: September 2013

Based on a simple analytical model, combinations of primary and secondary pole numbers for linear switched-flux permanent magnet (LSFPM) machines with odd pole number of primary are compared, with respect to back electromotive force (EMF) and electromagnetic thrust force. The winding configurations are also determined according to the coil-EMF vector diagram. Based on optimized LSFPM machines, some basic electromagnetic performances are compared in LSFPM machines with 9 primary poles. It is shown that the secondary pole number should be close to the primary pole number and the higher secondary poles can lead to a better performance.
Mathematical Model and Characteristics Analysis of the Novel Dual-Redundancy Permanent Magnet Brushless Machine System
Authors: Luo Zhan Qiang , Liang De Liang
Published: September 2013

Dual-redundancy electromechanical servo actuation system used in the more electric aircraft servo actuation system has the advantages of both small size and high power density, and improves aircraft servo control system working reliability. And dual-redundancy permanent magnet brushless machine (DRPMBLM) used to realize electric energy to mechanical energy conversion is the key component, which directly affects the performance of the system. In this paper, The system topology is proposed by the analysis of the kind of redundancy structure of DRPMBLM. The mathmatical models of PWM converter model and state equations for DRPMBLM system were proposed. In these models, the mutual coupling for the mutual inductances between phases in each redundancy is considered. The simulation adapts to time-varying Network model. By using this proposed system model, the dynamic performances and characteristics for the DRPMBLM system are predicted and analyzed. Simulation and experimental results are compared in DRPMBLM system to verify the proposed modeling and characteristics analysis.
The Design of a Moving-Magnet Linear Oscillating Motor for Linear Compressors
Authors: Fei Teng , Yu Hai Tao
Published: September 2013

The fundamental theory and simplified model of moving-magnet 1inear oscillating motor are presented in this paper. Based on the analysis of the equivalent magnetic and electric circuit model, a 2D finite element (FE) model of a linear oscillating motor with two separated stators is established. Through the FE simulation, the effect of the input voltage on the electric-magnetic force and displacement is investigated. The efficiency of the motor is estimated according to the analysis.
New Neural Network Inverse Control of Two-Motor Drive System
Authors: Kang Mei , Zhao Wen Xiang , Ji Jing Hua , Liu Guo Hai
Published: September 2013

Two-motor drive system is a multi-variable, nonlinear and strongly coupled system. A new synchronous control strategy for two-motor system is proposed based on radial basis function (RBF) neural network inverse with particle swarm optimization. To enhance the system performance, the particle swarm optimization is adopted to optimize the RBF nerve center, an optimized RBF neural network inverse and a two-motor system is connected in series to form composite pseudo-linear system. This two-motor synchronous system can be decoupled into two independent linear subsystems for speed and tension. Then, the decoupled control is implemented by designing a linear closed-loop adjustor. The experimental results verify that the two-motor synchronous system can be decoupled well for speed and tension based on the proposed neural network inverse system. Also, the proposed system can deal with external disturbances with strong robustness.
A New Burn-In Test System of Motor Controllers Using Zero-Sequence Current Control
Authors: Lu Si Chen , Pan Zai Ping
Published: September 2013

A new burn-in test system of motor controller using zero-sequence current control is presented. The new system consists of two motor controllers and a three-phase reactor. The zero-sequence current control ensures that the three-phase current is symmetrical and sinusoidal, so that two motor controller can be tested at the same time. The results of the simulation demonstrates that the zero-sequence current control is able to ensure that the three-phase current is symmetrical and sinusoidal and can meet all the requirements of the burn-in test system of motor controller. The system uses less hardware, has less loss and it is more energy-efficient, more convenient.
An Effective Direct Torque Control Based on Space Vector Modulation for DTP-PMSM
Authors: Zhang Wei , Zhang Ping , Zhang Xin Hao , Shen Xiao Feng
Published: September 2013

This paper has proposed an efficient direct torque control strategy based on space vector modulation (SVM-DTC) for dual three-phase permanent magnet synchronous motor (DTP-PMSM), which is implemented in a synchronous reference frame aligned with the machine stator flux vector. This strategy adopts the space vector modulation technique to compensate for the stator flux error, and then the continuous smooth response of the vector control and the rapid response of direct torque control are both achieved. Simulation studies of a 3KW DTP-PMSM are carried out. Simulation results show the improvement of the torque response, decrease of the torque ripple, the higher steady performance and better flux waveform.
Condition Monitoring and Fault Diagnosis for Hoisting System Driven by PMLSM
Authors: Zhang Hong Wei , Yu Fa Shan , Wang Xin Huan , Bu Xu Hui
Published: September 2013

The hoist system driven by Permanent Magnet Linear Synchronous Motor (PMLSM) is a revolutionary new technology for high-rise buildings and ultra-deep mine, but also requiring new technology to enhance reliability and improve customer service. Condition monitoring (CM) is a technique or a process of monitoring the operating characteristic of a physical system. By studying on the structure and operating characteristics of PMLSM driven hoisting system, the paper proposes an on-line condition monitoring system for PMLSM driven hoisting system, which can monitor the operation parameters, give faults have occurred, and identify the root cause of the fault. The fault models and condition monitoring soft are designed. The obtained results are expected to be useful for PMLSM driven hoisting system.
Design and Experiment Analysis of Induction Machine Used in the Economical EV
Authors: Guo Xin Hua , Lu Xiao Fen , Zhang Gan , Song Xiao Feng
Published: September 2013

In this paper, a cage rotor induction machine is designed according to the demand of Beijing Automotive New Energy Automobile Limited Company. The design results of the stator and rotor are given, which is verified by simulation, and the induction machine is manufactured. Then the induction machines control diagram is given and the controller is manufactured. This system is assembled in the EV, and the debugging tool of Vector CANalyzeris introduced. The experiment results of vehicle road test show that the induction machine and its controller designed could meet the demands of customer.
Proposal of Novel DTC Method for Long Primary Multi-Segmented PMLSM
Authors: Li Li Yi , Zhu He , Ma Ming Na , Chan C.C.
Published: September 2013

In this paper, the multi-segmented PMLSM mathematics model of dual inverters power supply strategy is established through the profound research on the changing rules of inductance and coupling flux linkage, based on the mechanical and electromagnetic structural characteristics of the motor. Meanwhile, according to the model, the thesis puts forward the novel combined direct thrust control (DTC) algorithm for both contiguous segment observed flux linkage and thrust, which overcome the practical difficulties of conventional DTC algorithm applied for multi-segmented PMLSM. Theoretical analysis illustrates that this algorithm not only maintains high-transient response of DTC but also minimizes inter-segment thrust ripple in segmented PMLSM. Simulation demonstrates that this controlled method presents the favorable effects of the steady and transient states even in the process of mover operations between segments.
Design of Single Neuron Adaptive PID Based on Quadratic Performance Index for Linear DC Motor
Authors: Li Li Yi , Chen Qi Ming , Liu Jia Xi , Zhu He , Tan Guang Jun
Published: September 2013

In this paper, a new control strategy is put forward, which is a single neuron PID control based on the quadratic performance index (QPI) learning algorithm. This single neuron PID control is self-learning and self-adjusting. Through the study of system performance, the weights of the neuron are adjusted by the QPI learning algorithm. The new strategy solves the contradiction between fast tracking performance and robustness in the positioning servo system. In addition, the mathematic model of voice coil motor is analyzed. In order to improve the fast response performance and disturbance suppression of the position loop, the Two-Degree-of-Freedom (TDOF) control is proposed. The simulation results show that disturbance rejection and dynamic performance of the VCM servo control system have been improved. Compared with the utilizing traditional PID system, this new control strategy has stronger self-adapting and robustness.
Optimal Time Control for a Magnetic Levitation Linear Servo System
Authors: Kou Bao Quan , Xing Feng , Zhang Chao Ning , Zhang Lu
Published: September 2013

The paper presents a new way to control the feed speed of the magnetic levitation linear servo system by adopting optimal time control theory. The optimal switch curve is obtained by building the system model and determining the control variable, control condition and target function. According to the optimal switch curve, the system can realize the optimal control of the speed. The validity of the optimal control theory in this servo system has been proven by modeling and simulating in Matlab/Simulink. The simulation result shows that the execution efficiency of the magnetic linear servo system can be improved by applying the optimal control theory.
Dynamic Simulation of Electric Automobile Drive Motor Based on ADVISOR
Authors: Zhang Zheng Zhong
Published: September 2013

In the new era, automobile manufacturing industry technology is increasingly mature, and some high techs begin to be integrated in the study of electric automobile performance. Dynamic simulation and imitation technology is important in development of new enterprises. ADVISOR is a series of model subordinate to MATLAB and SIMULINK software environment, and data and script files are high-quality vehicle simulation software developed in MATLAB and SIMULINK software environment. The thesis first of all gives an introduction to the development status of electric automobile, based on which the application function of drive motor and drive motor dynamic simulation of electric automobile based on ADVISOR are presented, so as to contribute to future studies.
Characteristic Analysis of Moving Magnet Type Double-Sided Linear Synchronous Motor
Authors: Ding Hao , Guo Liang
Published: September 2013

Compared with double-sided permanent magnet linear synchronous motors (DPMLSM) with long secondary, the short secondary construction also has advantages of high dynamic performance and stable thrust, and is more suitable for the aspect of long-term acceleration. In this paper, magnetic field and characteristic of two different moving-magnet-type double-sided linear synchronous motors were analyzed by using 2D finite element method (FEM). The internal and external permanent magnet motor constructions with the same NdFeB and windings were compared according to flux density and electrical force. It was inferred that internal PM motors can provide the same force with lighter secondary weight and faster response speed.
Analysis of the Auto Intelligent Control Based on RFID Technology
Authors: Cao Xiao Juan
Published: September 2013

The control system is the main device to carry out executive action in enterprise, which assists the drivers' action inside the vehicles based on the actual route and maintains the running stability of the car so as to reduce the negative impact from the outside conditions on vehicle performance. In essence, radio frequency identification (RFID) technology belongs to the application of communications technology, which uses wireless transmission signal to identify and lock target identification, and then establishes corresponding information transmission mode, thus providing a virtualized operation platform for the target operation and control. This paper firstly analyzes the defects of the current auto control system, introducing the characteristics of RFID technology's application to auto control. Secondly this paper analyzes the design of GPS navigation control system based on RFID technology, so as to hope to make a useful contribution to the follow-up research.
Research of Fuzzy PID Control Based on VHDL
Authors: Wang Xue Song
Published: September 2013

This paper describes the use of VHDL and fuzzy controller design process.Compared with conventional PID control, fuzzy control is not dependent on the accurate mathematical model of the controlled object. The implementation of integrated practical operating experience and the operation is simple, fast response, anti-interference ability, strong robustness parameters of controlled object. In response to the limitations of the traditional PID control algorithm in the control field, the fuzzy control theory with the traditional PID control algorithm by combining the parameters self-tuning function, the proposed fuzzy self-tuning PID controller design method and algorithm-depth study analysis.
Design of Mini-Message Bus Control System Compiler
Authors: Li Yan Xin , Li Guang Yu
Published: September 2013

This paper studies the application programming interface in configuration software. Based on comprehensively considering softwares application, a mini-message bus configuration languageMMBCL language is designed by using C language, whose compiler and development environment are fulfilled. The designing, syntax analysis, semantic analysis of MMBCL are deeply discussed. This configuration language is simple, similar to C language, easy to write, consistent with industrial control standard. And it has successfully applied to the industrial project and proves the efficiencies of the configuration language and the compiler.
Copper Losses and Rotor Losses Calculation for the BLDCM Used in a Flywheel Energy Storage System
Authors: Liu Kai , Hu Jian Hui , Zou Ji Bin , Xu Fei , Li Yong
Published: September 2013

This paper presents a finite element investigation into the copper losses and rotor eddy current losses in brushless DC motors used in a flywheel energy storage system. The copper and rotor losses generate heat which needs to be dissipated in order to not exceed a defined temperature level for the magnet or winding insulation to avoid demagnetization or damage, which if it occurs will reduce the motor performance. The principle of operation and losses calculations are presented in the paper. The influences on the copper and eddy current losses are analyzed in detail, including the operation mode, the control strategy and the variation of the speed. Simulation and experimental results are presented and discussed.
Study on PV Grid-Connected Inverter System MPPT Control
Authors: Liang Qi Feng , Liao Hong Fei
Published: September 2013

As people enter the 21st century, energy problems become one of the important restriction factors which have great influence on sustainable development of human society. So how to develop new energy and effectively use new energy is an important problem which we must face. Under the simulation environment of Matlab/Simulink, the simulation model of the whole system is established, simulation experiments are made on the designed main circuit and control system to test the design. In addition, photovoltaic array simulation model is established to test the performance of the system using perturbation observation MPPT control algorithm.
Application of Optical Fiber Sensor System in Offshore Oil Field
Authors: Guo Shi Sheng , Wang Ying Ying , Wang Chang , Liu Xiao Hui
Published: September 2013

Optical fiber sensors have been used widely in offshore oilfield. An optical fiber sensor system including an optical fiber sensor testing temperature and pressure under well, a connector connecting the optical fiber sensor with the optical cable, two connectors connecting cables, 3600 meters armoured optical cable and an interrogator was applied in an offshore oil well on Zhoushan island. The temperature and pressure under well have been measured for about two month and the testing results are presented in this paper.
Computational Aeroacoustic Simulation of Landing Gear
Authors: Yang Guang Jun , Liu Jian Jun , Sun Jing
Published: September 2013

RANS / NLAS numerical simulation method is adopted in this paper to carry out study on the aerodynamic noise analysis of basic landing gear configuration. Reynolds average N-S equation is solved with nonlinear turbulence model to establish the landing gear initial flow field, based on which, the NLAS (nonlinear acoustic solver) processed the turbulence fluctuation reconstruction to obtain the near-field acoustic characteristics of landing gear. Combined with the flow characteristics and the associated noise spectrum analysis, aerodynamic noise characteristics of landing gear are achieved. The work in this paper can provide useful research foundation on the following noise reduction design of landing gear.
Analysis and Testing of Microvibration Produced by Control Moment Gyroscope in Multi-Platform
Authors: Xia Ming Yi , Cheng Wei , Wang Yun Feng
Published: September 2013

When the satellites CMG (Control Moment Gyroscope) generate the control moment, they will also generate the periodic and broadband disturbance vibration force, and will have a greater impact on the performance of instruments with high pointing precision and stability. This paper analyze a large CMG of 70Nms belonging to a remote sensing satellite, its feature is the mass of moving parts. So when it is installed to the test table that we designed independently, the fundamental frequency of the system as a whole will significantly reduce. Based on past study the purpose of this paper is mainly focused on the testing techniques of the heavy moving parts, and the technical method to isolate the test tables stiffness from test results.
Passivity-Based Stabilization of Underactuated Mechanical Systems
Authors: Wu Shan Shan , Huo Wei
Published: September 2013

A new stabilization control method for underactuated linear mechanical systems is presented in this paper. By proper setting the desired closed-loop system, the matching condition for controller design is reduced to one equation and an adjustable parameter (damping coefficient) is introduced to the controller. Stability of the closed-loop system is proved based on passivity. As an application example, stabilization control of 2-DOF Pendubot is studied. The system is linearized at its equilibrium point and the proposed controller design method is applied to the linearized system. The procedure of solving matching condition and design controller for the Pendubot is provided. The simulation results verify feasibility of the proposed method.
Effect of the Temperature on Diamond-Like Carbon (DLC) Thin Film Based on LIS
Authors: Huang Lei , Yuan Jun Tang , Wang Zhen Hua , Yu Bin Bin
Published: September 2013

Diamond-like carbon (DLC) thin films were deposited on YG6 cemented carbide by an anode-layer linear ion source (LIS). The effect of different temperatures (20°C, 80°C, 115°C and 150°C) on DLC thin films was investigatedby using atomic force microscope (AFM), scanning electron microscope (SEM) and Raman spectroscopy. It was found thatthe surface roughness of the film decreased at first and then increased with the increase of the temperature, and reached the trough at 80°C. The intensity ratio (ID/IG) and the adhesion of the film increased at first and then decreased, and both of them reached the peak at 80°C. When the temperature was 80°C, the surface roughness was 6.9nm, the intensity ratio (ID/IG) was1.91 and the critical failure load was 107.23N. The results show that the temperatures have a great effect on the surface morphology and mechanism properties of DLC thin films. Consequently, this paperfurther studied the effect mechanism of different temperatures on DLC thin films based on the experiment.
Two-Layered Microwave Absorber Laminated with Magnetic Composites for Intelligent Transport System
Authors: Kim Sung Soo
Published: September 2013

Two-layered microwave absorbers are designed for the achievement of low reflection coefficient for wide angles of oblique incidence at the frequency of intelligent transport system (5.9 GHz). Magnetic composite sheets were fabricated with carbonyl iron (CI) and Co2Z hexaferrite particles in rubber matrix. On the basis of transmission line theory, reflection loss has been calculated with variation of incident angles for both transverse electric (TE) and transverse magnetic (TM) polarization. The minimum reflection loss (less than-20 dB) is predicted at 5.9 GHz for the laminated composites of Co2Z/CI. At the optimum thickness of the composite layers, a low value of reflection loss (less than-10 dB) is predicted for wide incidence angles up to 60°. The two-layer composites laminate can be proposed as the high potential microwave absorbers for improvement of electromagnetic environment in ITS operation.