bluuebunny/crossref_metadata_2025 huggingface dataset:
The Industrial Research about China Solar PV Based on the Price of Polysilicon
Authors: Liu Yi Jun , Liu Ying Qi
Published: November 2011

Polysilicon is an important part of forming the component of solar PV, which costs most in the total cost of PV, and is about 37% of the prime cost in grid-connected PV system. By analyzing and forecast the changes of Polysilicon prices, combined with China current situation and relevant policies on photovoltaic power generation, to make some suggestions for the development of China solar photovoltaic industry
Iterative Learning Cross-Coupled Control for XY Table Based on Real-Time Contour Error Estimation
Authors: Wang Li Mei , Yang Qi , Sun Yi Biao , Liu Chun Fang
Published: November 2011

The contour accuracy of XY table directly driven by two linear motors was influenced by the complicated reel-time contour error model of free-form curves, uncertainty external disturbance and dynamic matching between X axis and Y axis. To establish XY table model that easily calculated and suitable for free-form curves, real-time contour error estimate method was adopted. In order to reduce uncertainty external disturbance and dynamic matching between X axis and Y axis, the iterative learning cross-coupled controller (ILCCC) was designed for current compensation on X axis and Y axis. Simulation results show that the control scheme can enhance the robustness of the system, and effectively improve the XY table of contour precision.
Analysis and Experimental Validation of Performance of Z-Source Inverter-Fed Permanent Magnet Brushless DC Motor Drive
Authors: Shang Jian , Liu Zhi Zhen , Zhang Yan
Published: November 2011

The Z-source inverter has overcome the limitation of the conventional voltage source inverter and current source inverter and provides a new option for motor drive system. The Z-source inverter has the unique ability of boosting the voltage of the dc source, which has advantages in the motor drive system for electric vehicles where the voltage of the onboard battery is usually lower. Firstly, this paper analyses the speed characteristic of permanent magnet brushless dc motor. Then operation principles and the control method are described and an effective and convenient strategy for generating PWM pluses with shoot-through states based on TMS320F2812 DSP is introduced. At last, the results of this experiment are presented and verify the correctness of the model.
Research of Fuzzy Direct Torque Control of Permanent Magnet Synchronous Motor Based on Simulink
Authors: Zhao Ying , Li Tang Juan
Published: November 2011

This article is about the direct torque control of permanent magnet sysnchonous motor with fuzzy theory to the study and simulation implementations. Mainly based on the analysis of the mathematical model of direct torque permanent magnet motor the analysis，using powerful func-tion of simulation in Matlab,the S function of Simulink, electrical simulation moduleand Fuzzy function blocks to achieve. Papers mainly in the inverter switching choice of the control system ap-plied the fuzzy control theory allowing more accurate selection of voltage vector.From the simula-tion results ,we can find that this method is advantage to performance improvement of permanent magnet motor control system.Therefore, fuzzy direct torque control of permanent magnet syn-chronous motor idea is feasible and beneficial to the system to run stable.
CMM Inspect Path Planning for Precision Convex Revolved Surfaces
Authors: Pan Wei Min , Yu Yong Jian , Ma Wei , Liu Yong Gang
Published: November 2011

The revolved surfaces are widely applied to both optical equipments and aerodynamic domain. The revolved surface is measured by digitized measurement with the coordinate measuring machine (CMM) in this paper. A CMM inspecting path planning which is different from traditional measuring method for revolved surface is given. At the same time, this method is proved effectiveness through a practical measuring example of an optical part. The Measuring process and the measuring results are illustrated in detail.
A Study on Method of Map Conflation Based on Topological Relationship
Authors: He Dong Cai , Zhang Jin , Chen Jun Jie
Published: November 2011

A new approach for vector spatial data Fusion based on Topological Relationship is presented. The constraints in map conflation are first derived, and the coordinates displacements of the conflated objects are then obtained by topological correlation computation. The results of the map conflation test show that the proposed method has a high precision and better ability to maintain the characteristics of the conflated objects compared with the exist methods.
Influence of Ply Angle on Failure Response of Bolted Composite Joint
Authors: Zhou Song , Wang Zhen Qing , Zhang Ji Feng , Xie Yong Gang
Published: November 2011

A three-dimensional model of bolted single-lap composite joint was developed to investigate the influence of ply angle on failure response of joint. This model can predict the failure mode and failure load of joint with arbitrary ply angle. The property analysis of joint was performed by using the ABAQUS FE code. Failure response and degradation of material properties were implemented using a progressive model, which is incorporated in ABAQUS USDFLD subroutine. The progressive model utilizes a set of stress-based three-dimensional Hashin criteria and a set of appropriate degradation rules.
Research on Inorganic Material Modification of PVC
Authors: Yang Chao
Published: November 2011

PVC Resin has a great deal of excellent performances. It is corrosion preventive, inflaming retarding, resistant to wear and is insulated and so on. At the same time, its price is very competitive. Therefore, PVC Resin is being widely applied in a lot of aspects, which include bars, tubular products, thin films, antiseptic materials, insulation materials as well as building materials, and so on. It is a thermoplastic plastic which is of great importance. However, PVC Resin has large brittleness; its heating stability is not good; the performances of shock resistance are low and the handling characteristics are not good. In order to further improve its performances, PVC Resin must be modified. This paper studies on the inorganic material modification of PVC. From the perspective of the industry of plastic, polyvinyl chloride (PVC) is a kind of thermoplastic plastic which is of great importance. The field of application of PVC is very diverse. It can be used in multiple scopes, which include tubular products, thin films, structural sections, insulation mate-rials as well as bars and so on. As for the volume of production, it is next only to polyethylene in worldwide output of resin, ranking the second place. Polyvinyl chloride has a great amount of ex-cellent performances. For example, it is not flammable, insulated, corrosion preventive, as well as resistant to wear and so on. The most outstanding advantages of PVC are that its price is extremely competitive, and that its tensile strength as well as bending strength is larger than the ordinary gen-eral purpose plastics. However, PVC Resin is polar non crystalline polymer. The molecular of PVC Resin have very strong interactions. The material is hard and brittle, and its shock strength is low. This shortage restrains its further development as well as its application. In order to overcome this shortage of PVC resin, it should be modified so that its ductility can be improved. This is also one of the key content that is currently studied on.
Design and Development of a Rotary Airlock Valve for Using in Continuous Pyrolysis Process to Improve Performance
Authors: Somsuk Nisakorn , Wessapan Teerapot , Teekasap S.
Published: November 2011

A rotary airlock valve is a widely used device in material handling processes. It can be applied to the conveying of pyrolyzing wood chips into pyrolysis ovens for wood vinegar production. In a pyrolysis process, the process conducted in a closed system, under limited amount of air and high temperature conditions, and then a rotary airlock valve is provided for conveying pyrolyzing wood chips to be pyrolyzed. This research aims to design and develop a rotary airlock valve to achieve a uniform feed and an airlock operation (feeding without leaking), and consequently to improve its performance, for using in continuous pyrolysis process, in which a continuous material feeding is required. Due to the better airlock the better pyrolysis product yields. The rotary airlock valve is designed by concept of minimum clearance between the blade tips and the housing, along with using a rotor with the adjustable and replaceable blade tips mounted on blades welded to a rotor shaft, and a packing seal, in the closed rotor, and thus minimize leakage. According to the airlock performance test results of the developed rotary airlock valve, its performance improved approximately 60% when compared to the conventional counterpart. In this paper, conclusions for future research are described.
The Application of Permanent Magnet Electric Machine on Electrical Wheelchair
Authors: Dou Xiao Xia , Tong Qi Ming
Published: November 2011

The driving motor is an important executive component of electrical wheelchair. Its performance and quality directly influence wheelchair’s function. For permanent magnetic direct-current motor in electrical wheelchair, its main designed character, structure and the designed method are discussed, and the system parameter and identity are shown. The wheelchair motor performance test displayed that it achieved Japanese standard. A useful reference for continuing develops of products can be looking forward to.
Material Level Noise Measuring for Steel Ball Coal Mill Based on Energy Entropy of Wavelet Packet and Least Squares Support Vector
Authors: Cai Zhi Yuan , Li Tie
Published: November 2011

A new material level noise measuring method of steel ball coal mill was proposed on the basis of energy entropy of wavelet packet and least squares support vector machines. First, four layers wavelet packet decomposition of the acquired noise signals was performed and the wavelet packet energy entropy was extracted; then the eigenvector of wave packet of the noise signals was constructed, the least squares support vector machines were trained to intelligent material level measuring by taking this eigenvector as sample. The simulation result from the proposed method is effective and feasible.
Nanoimprint Lithography of Multistep Loading
Authors: Yan Le , Yin Lei , Liu Hong Zhong
Published: November 2011

In this paper, a method of multistep imprint lithography process is described. Through comparing among the loading process factors, a multistep loading locus, which includes a pre-cure release of the pressing force, is proposed for the high-conformity transfer of nano-patterns from the template to the wafer. A series of imprint experiments show that the new multistep loading process can meet the needs for different pressing areas, feature sizes and repetitious imprints. This loading process can effectively reduce the residual resist thickness while maintaining a uniform residual resist and non-distorted transfer of nano-patterns to the resist-coated wafer. And a high-conformity of 100 nm feature can be achieved.
The Design and Test of HEMP Simulator Based on Coaxial Peaking Technology
Authors: Fan Li Si , Guo Hai Guang , Wei Guang Hui
Published: November 2011

A HEMP Simulator was constructed based on coaxial peaking technology. The experimental results show that: a HEMP field matching the MIL-STD-464A standard is generated under the bounded wave transmission line when the parameters are selected reasonably; the variation coefficient of output wave parameters such as peaking filed strength, rise time and half time show that the repeatability of the HEMP simulator are very good; there is linear relation between the peaking field strength and the charging voltage of the Marx generator.
The Simulation of New Arc Welding Power Based on Matlab
Authors: Zhao Gang , Shan Chao
Published: November 2011

Arc welding technology is an important part of modern welding technology, and providing the energy of arc welding power source is welding technology at the core. The traditional arc welding power source is backward in technology and large amount of consumables, so arc welding inverter power has become the direction of its development. With the enhanced awareness of energy saving and environmental protection, this paper concentrates on new high power factor of arc welding power source as the research object, and introduces the main structure of high-power arc welding power source. At the same time, using Matlab software for modeling and simulation analysis on the main circuit and control circuit, the simulation results comply with the design requirements and verify the feasibility of the system design.
The Design of CAN Bus Intelligence Node Based on MCF52234
Authors: Li Guo Hong , Zhang Cong , Tian Jing
Published: November 2011

The paper designs a system of CAN intelligent control node which uses MCF52234 as microprocessor, focusing on describing how to implement hardware and software of CAN intelligent control node, and realized the communication between CAN control network in the intelligent control nodes and the host computer.
A Novel Multi-Tooth Fault-Tolerant Flux-Switching Machine
Authors: Wang Yu , Deng Zhi Quan , Wang Xiao Lin
Published: November 2011

Fault tolerant flux-switching permanent magnet (FTFSPM) machine is a novel fault tolerant machine having magnet in the stator, which not only has the advantages such as excellent physical, mechanical and magnet insulation abilities, but also overcomes the disadvantages in conventional rotor-PM topology like magnets are subjected to centrifugal force and difficult to dispel heat. However, the ability to inhibit short circuit current of FTFSPM has a great impact on the machine torque (power) density. In this paper, a novel multi-tooth fault-tolerant flux-switching permanent magnet (MTFTFSPM) machine which has big self inductance is proposed. Finite element analyses (FEA) are employed to compare the electromagnetic performance of three types of fault-tolerant topology including flux-linkage, back-EMF, torque density and inductances. The results show that the MTFTFSPM machine can reach higher torque density than traditional FTFSPM due to the multi-tooth structure.
A Novel 12/10 Electrical Excitation Flux-Switching Machine
Authors: Wang Yu , Deng Zhi Quan , Wang Xiao Lin
Published: November 2011

A three phase, electrical excitation flux-switching (EEFS) brushless ac machine is proposed, its electromagnetic performance, viz., the phase flux-linkage and back-EMF waveforms, the torque density, the electromagnetic torque, and the torque-current characteristic, are evaluated based on finite element analysis. An EEFS machine exhibits sinusoidal flux-linkage and back-EMF waveforms. Compared with a hybrid excitation flux-switching (HEFS) machine, when de-excitation at fault is needed, the torque density of EEFS machine is ~20% larger than that of a HEFS machine with the same armature and field current copper loss.
Research of Engine Piston Pin Fatigue Analysis Based on UG
Authors: Liu Hong Pu , Wang Hong Ying
Published: November 2011

Carried on finite element analysis using the UG software to finally carry on the fatigue life’s computational method to carry on the exploration and the research. when carrying on the finite element static analysis to the piston pin, used the different analysis method, because the piston pin’s quality is very slightly oppositeing to the piston quality, produces the force of inertia is very small, the counter stress computed result is not very obvious, therefore to piston pin finite element analysis we uses conventional algorithm that infliction boundary condition.
The Study and Simulation of Pitch Control Servo System in Mega-Watt Class Wind Turbine
Authors: Zhao Hui , Jiang Hai Quan
Published: November 2011

This paper firstly analyzed the theory of the MW wind turbine generator pitch control, and then based on the analysis, designed a servo drive system with PMSM motor-driven and double closed loop control consisted of inner speed loop and outer current loop. Finally, use MATLAB establishes the corresponding model to simulation test. Simulation results show that the servo control system has good dynamic, steady state performance and robustness.
Direct Torque Control of Bearingless Induction Motor Using Space Vector Pulse Width Modulation Based on Fuzzy Adaptive Control
Authors: Wan Luo Fei , Liu Xian Xing , Wang Zheng Qi , Zhou Jin Wei
Published: November 2011

This paper presents a new strategy of direct torque controller for bearingless induction motor using space vector pulse width modulation based on fuzzy adaptive control. when we use direct torque controller using space vector pulse width modulation to take decoupling, the parameters of PI controller which generating the reference voltage vector in conventional SVM-DTC are difficult to determine the dynamic operation. In order to improve away the disadvantages of conventional SVM-DTC system, flux and torque fuzzy adaptive controller were designed to substitute the original flux and torque PI controller in the controlling for bearingless induction motor using space vector pulse width modulation. With the fuzzy algorithm, it is easy to obtain the control voltage component of the flux and torque respectively. Two voltage vectors achieve real-time adjustment and solve the disturbance problems in torque loop and flux loop. In this paper, the design process of the fuzzy adaptive controller is given. Use Matlab/Simulink to check the improved and traditional SVM-DTC method. The results show that the improved algorithms have a better performance in reducing the ripple of torque, flux and Rotor displacement when compared with the tradition DTC method. And it also improves the system dynamic performance.
Modeling and Dynamic Characteristic of a Pneumatic Solenoid Valve
Authors: Pan Xiao Wang , Lin Min , Guo Bin , Lu Yi
Published: November 2011

A new method, obtaining the pressure-time relations during air inflation and deflation process, is proposed to research the dynamic characteristic of a pneumatic solenoid valve. The current, magnetism, mechanical and air subsystems of the valve are investigated. In order to experimentally verify the advantage of the new model, two models are compared. Simulation results show, the opening and closing reversal times of the model without air subsystem are 29.6ms and 30.7ms. The new model’s reversal times are 31.8ms and 36.1ms. 32.5ms and 35.3ms are the results by experiments. The experimental results show very good agreement with the new model.
Analysis of Dual Stator-Winding Induction Generator Based on Ansoft
Authors: Shi Xian Jun , Liu Ling Shun , Wang Jing
Published: November 2011

Wind generating stand-alone supply systems has presented new demands for induction generator. The dual stator-winding induction generator is presented for these demands. In this paper, the electromagmeshic field analysis for an optimal sample of dual stator-winding induction generator is proposed via maxwell2D ANSOFT. The physical model and mesh cutting model of FEA are setup. The field analysis of no-load and rated-load are presented respectively. Post disposing results are analyzed.
Application of Complex Method for Optimization of Isolated Heat Pipe Heat Exchange System
Authors: Wang Rui Hua , Wang Pu , Zhu Yuan Fang
Published: November 2011

An isolated heat exchange system is added to Beijing Unicom computer room in order to reduce air-conditioning energy consumption of original computer room. The steady-state model of the heat exchange system is built using mechanism modeling method according to actual operating data and the basic principles of heat transfer process. To obtain the maximum of energy efficiency of the system, the complex method was used to search the optimal operating point. By comparing the data before and after optimization, it shows that the complex method for solving operational problems of heat exchange system is very effective.
Hot-State Numerical Simulation Study on Top-Blown Bath in ISA Furnace
Authors: Wang Shi Bo , Wang Hua , Xu Jian Xin , Zhu Dao Fei , Sun Hui , Li Hong Juan
Published: November 2011

The 3D numerical models of a single free falling bubble hitting water surface and multi bubbles floating upward and fusing have been achieved by considering the influences of surface tension and wall functions in theoretical framework of VOF. On that basis, the 3D hot-state numerical model for simulating top-blown bath in ISA furnace is presented. The influences of the injection flow rate and the depth of immersion on mixing behavior and temperature distribution are discussed. The results of this paper provide the reference of theory calculation of optimizing operation of ISA furnace.
Nonlinear Immune PID Controller and its Application to the Heat Milling System’s Material-Level Control
Authors: Liu Jiu Qing , Wang Wei
Published: November 2011

Based on the fusion of immune feedback mechanism for the conventional PID control technique, a new immune nonlinear PID controller is proposed in this paper. The stability of immune nonlinear PID is analysised using Popov stability criterion. The controller designed not only guarantees the stability robustness and performance robustness of the system but also the tracking performance of the system. The numerical simulation results of the Material-level control of the heat milling system show the effectiveness and feasibility of our immune unlinear PID are verified in Mat lab.
The Influence on High-Speed Electrical Multiple Unit by Fluctuation of Traction Power System’s Voltage
Authors: Liu Rui Kuo , Chen Chun Yang , Lu Yan Xia
Published: November 2011

The duplicate rectifier’s control strategy and principle are researched. Besides this paper derivers a formula for calculating support capacitor from the relation of power transfer in rectifier. Established simulation model of Traction Power Supply System based on Matlab/Simulink, in order to build platform of Traction Power Supply System’s load condition on digital simulation tests. Through coupling the simulation model of Traction Power Supply System and PWM rectifier, analyzes adaptability of PWM rectifier when the fluctuation of the supply conductor voltage. So we need cut down the railway vehicle’s power when the voltage too low or too high.
Design of Photovoltaic Generation Monitoring System Based on WinCC
Authors: Wang Dong Tao , Yao Dan Dan
Published: November 2011

A photovoltaic generation monitoring system based on WinCC is introduced in this paper. The photovoltaic generation monitoring system is composed of programming intelligent models, PLC, industrial control computer. The human machine interface (HMI) of upper computer is developed by WinCC. With a friendly HMI, the system is convenience for operation and maintenance. System reliability and good control effects are shown in real time operation.
Circuit Model of Laser-Triggered Surface Flashover Switch in Vacuum Condition with Pulsed Voltage
Authors: Pan Ru Zheng , Wang You Hua , Zhao Zhi Zhong , Xu Wei , Jin Qi Long , Yan Ping , Wang Jue , Sun Guang Sheng
Published: November 2011

Based on the platform of laser-triggered surface flashover in pulsed voltage, experiment of laser-triggered surface flashover switch is carried out in vacuum condition with pulsed voltage. The switch consists of flat electrodes and columned insulator. A single/double harmonic, with wavelength λ of 1064/532 nm, Q-switched Nd: YAG laser is applied to trigger the switch. The results of experiment show that switch delay time and jitter time decrease with increase of pulsed voltage and laser energy density. Based on the waveforms of switch voltage and switch current, the circuit model of laser-trigger flashover switch is set up by circuit method in the paper. The parameters of the circuit model are calculated through the waveforms of the experiment, and the waveforms of switch voltage and switch current are obtain through circuit simulation. The simulation waveforms of the switch model are consistent with the waveforms of the experiment.
A New Temperature Setting Control Method for Regenerative Rotary Reheating Furnace
Authors: Su Fu Yong , Wen Zhi
Published: November 2011

Regenerative rotary reheating furnace is a new type furnace in metallurgy industry. It can reduce cost and it is low contamination exhaust. But it is hard for the temperature setting because it has complicated field and especial configuration. This paper focuses on the regenerative rotary furnace, develops mathematics models and regional discrete method for temperature setting. This paper produces a good example for subsequent research and development of regenerative rotary furnace.
Analysis and Experiment of the Eddy Current Losses for Canned Motor
Authors: An Yue Jun , Liu Guo Ming , Wen Hong Liang , Zhao Wen Qiang , Xue Li Ping , Guo Chun Ye
Published: November 2011

Induced eddy currents in can cause loss when the canned motor runs, the loss make the motor`s temperature rise, directly affect the canned motor pump and the entire transmission system security. Empirical formula estimates eddy current losses which has a big error, it is difficult to meet the engineering requirements. For the canned motor with Hastelloy-C alloy or Sus316L cans, analyzed electromagnetic field and calculated can loss using a finite element method of Ansoft. The paper developed four prototypes, and obtained the experimental value of can loss via simple no-load experiment by the loss separation method. The results are compared with simulation value show that the accuracy of FEM is higher accurately than empirical formula; Analysis shows that dimension of a model and can material characteristic parameters such as the resistivity influence on the calculated error of FEM, the paper proposes to correct the error in the case of considering can material characteristic parameters.
An Improved Adaptive Kernel-Based Object Tracking
Authors: Liu Zheng Hua , Han Li
Published: November 2011

Kernel-based density estimation technique, especially Mean-shift based tracking technique, is a successful application to target tracking, which has the characteristics such as with few parameters, robustness, and fast convergence. However, classic Mean-shift based tracking algorithm uses fixed kernel-bandwidth, which limits the performance when the target’s orientation and scale change. An Improved adaptive kernel-based object tracking is proposed, which extend 2-dimentional mean shift to 3-dimentional, meanwhile combine multiple scale theory into tracking algorithm. Such improvements can enable the algorithm not only track zooming objects, but also track rotating objects. The experimental results validate that the new algorithm can adapt to the changes of orientation and scale of the target effectively.
Counting of Microscopic Cells Based on Grads Hough Transform
Authors: Chen Jian Jun , Gao Yi Jun , Deng Zhao Ju
Published: November 2011

In order to improve the accuracy and efficiency of automatic counting of microscopic cells, the method based on the Hough transform has been proposed. And the standard Hough transform has been improved using image gradient information. Compared with the traditional counting methods based on mathematical morphology and boundary tracking tags, the accuracy of the counting accuracy has been greatly improved. The results show the accuracy and efficiency of counting of the microscopic cells based on grads Hough transform is improved.
Composition Analysis of Ge/Si1-xGex: C Buffer on Silicon Measured by Planar Scanning Energy Dispersive Spectroscopy
Authors: Lu Z Z , Yu F. , Yu L. , Cheng L. H. , Han P.
Published: November 2011

In this work, Si, Ge element composition distribution in Ge /Si1-xGex:C /Si substrate structure has been characterized and modified by planar scanning energy dispersive spectroscopy (EDS) and X-ray diffraction (XRD). The Ge /Si1-xGex:C /Si substrate samples are grown by chemical vapor deposition (CVD) method. The accuracy of EDS value can be improved by ~ 32%. And the modified EDS results indicate the Ge distribution in the Ge/Si1-xGex:C/Si sub structure.
Research on a Novel Power Inverter Control Strategy Based on Micro-Grid
Authors: Chen Wei Min , Wang Wei , Cai Hui , Chen Guo Cheng
Published: November 2011

Based on summarizing a stand-alone running strategy of distributed power inverter and analyzing the possibility to control grid-connected power inverter with the same strategy, a novel micro-grid power inverter control method is proposed in this paper. While applying this method, the power inverter can not only output power in the grid- connected scenario, but also automatically produce power to satisfy the power demand or non-power demand about the load and power-sharing among inverters when the islanding and stand-alone events take place. It overcomes some traditional power inverter shortcoming that it can not make micro-grid smooth transition from grid-connected to islanding and to stand-alone status, due to the delay during different strategies being switched. At last, the effectiveness of the proposed method was proved by simulation results.
The Dynamic Characteristics of AD590
Authors: Fang Li De , Zhang Ji Ke , Li Xiao Ting , Xiang Xiu Ming
Published: November 2011

The dynamic characteristics of temperature sensor are very important in industrial temperature measure. In this paper, the dynamic characteristics of temperature sensor of AD590 has been researched on the same step volume and different initial temperature, and the different step volume and the same initial temperature, and in the state of the protected pipes and unprotected pipes by combining the theoretical model and many experimental data. Based on the theory of dynamic characteristics of sensor, a large number of experiment data was analyzed and compared, the time constant τ was obtained, also we discussed the relationship between the time constant and the amount of the step, and predicted the mathematical model and analyzed the main factors that affecting the dynamic characteristics of temperature sensor.
Research on Wood Powder-Based Rapid Prototyping Technology
Authors: Jing Chen
Published: November 2011

This paper introduced a new technology of rapid prototyping which using wood powder as its raw material based on spray technology, and introduced working principle, and further elaborated the working principle and working process of the rapid prototyping methods, the system composition of powder supplied and powder paved, and the prospects of the rapid prototyping technology. This technology could solve the high-cost problem of rapid prototyping technology at present and had practical value in some degree.
Study on System Identification Method Based on PID Control Algorithm
Authors: Tang Yu Dong , Zhu Xiao Chun , Feng Lu , Gui Chen
Published: November 2011

Parameter identification method is researched for the single-input and single-output systems in this paper. Based on the analysis of method of least squares, the new system identification method based on PID control algorithm is proposed. The PID controller is established by connecting the input and output with the system error and the system parameter. And the results of the simulations state that the new identification method is feasible and effective.System identification is the most important part in modern control theory. The definition of system identification proposed by L. A. Zadeh is that, system identification is determination the system in the gained systems which equivalent to the unknown system, according to the input and output of the unknown system. Traditional identification methods include impulse response, least square and maximum likelihood [1-2]. Identification speed and identification precise are all needed in the system identification. But identification speed is incompatible with identification precision. The improvement of identification do always conduce to the increase of identification precision, it can be verified by the identification examples, which is identified by the traditional identification methods. So for higher identification precision, the identification speed is lower. Now, a lot of high precision identification methods based on neural network or genetic algorithm, is proposed [3-7]. These new identification methods can gain very high identification precision, but it needs too much time. A new system identification method based on PID controller is proposed in this paper. It states by simulation that the new me-thod can improve the identification precision and speed.
Based on the Nc Machining System Error Aspheric Analysis and Research
Authors: Wang Hong Ying , Hu Xue Me
Published: November 2011

From the machining errors and static dynamic error influence two aspects are discussed in this paper, the analysis of machining process on the processing precision influence of error, puts forward process design. Long-term since, improving precision machine tool is through the two methods: error and avoid error compensation. Avoid error is a "hard", focusing on design and processing in the error may eliminate all stages. And error compensation in existing machine, can work environment to further improve the machining precision, it is a kind of economic effectively improve the machining precision of the method. For error analysis and calculation, the ultimate goal is to eliminate and reduce processing error, the improvement of the machining errors of classification in many ways. According to the machining process of the factors causing error to occur any regularity, processing error into system error and the random error, According to the nature of the changes with time, and can be divided into static error and dynamic error.
Application of Fuzzy Assessment Theory in Tower Crane Safety
Authors: Li Bin , Lei Li , Wei Li
Published: November 2011

Tower crane belongs to high risk equipment in the construction site. Evaluating safety statement of tower crane is a subject of the technical field. The paper setups a new way to evaluate the safety statement of tower crane by means of fuzzy assessment theory. Membership functions have been established for describing the influencing factors of tower crane safety. Fuzzy comprehensive assessment model for evaluating tower crane safety statement has been established. Finally an example for illustrating the method of using the fuzzy comprehensive assessment to analyzing the tower crane safety statement.
Expected Model for Time-Energy Trade-Off Problem of Product Disassembly
Authors: Tian Guang Dong , Liu Rui Jun , Liu Yu Mei , Chu Jiang Wei , Xu Guan , Chen Bo
Published: November 2011

In the actual disassembly decision-making, people may concern multiple evaluation parameters, such as disassembly time and disassembly energy. In order to deal with multiple parameters evaluation problem, the expected model of time-energy trade-off problem of product disassembly process is presented in this paper. Simultaneously, taking the typical transmission device for example, its stochastic time-energy trade-off problem is analyzed. The results provide guidance for disassembly practice.
The Characteristics of Calcium-Based Sorbent Burning Pore Structure and Simulation of Gas-Solid Mass Transfer in Vulcanization
Authors: Xiao Bao Qing
Published: November 2011

The experimental is carried out in the normal air atmosphere by calcining CaCO3 and using the scan electricity speculum and N2 adsorption apparatus to research the ventage structure of the calcinate CaO at 860°C.Analyzing on fractal dimension of different calcination temperature, heating rate and residence time. Thorough the pore structure of CaO which is a porous substance, using “dynamic pervasion modulus” to analyse the Calcium-based sorbent’s gas-solid pervasion transferring quality reaction when it is calcined in the furnace. Using the “dynamic pervasion modulus” and revising the expression of the SO2 adsorption quality in vulcanizing reaction.
Synthesis and Photovoltaic Properties of Fluorene-Based Copolymers with Thiophene Heterocycle on the Side Chain
Authors: Hou Qiong , Zeng Xiang Hua , Xu Xin , Guo Ting , Zhen Hong Yu , Li Guo Long
Published: November 2011

High molecular weight, readily soluable copolymer was prepared from 9,9-di (2-thienyl-hexyl) fluorene (TF) 2,7-bis(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-9,9-di octyl fluorene and narrow band gap comonomer 2,3-dimethyl- 5,8-(5-bromo)-dithien-2-yl-quinoxalines (DTQU) using pallad- ium catalyzed Suzuki coupling methods. To compare the copolymer to this without thiophene in the C9 side chain of fluorene, the copolymer from DOF and DTQU was synthesized. The electrochemical, optical and photovoltaic properties of the copolymers were studied. The absorption spectra of the copolymers measured in thin films display two absorption peaks. The power conversion efficiency achieved in the device configuration ITO/PEDT/FT- DTQU:PCBM (1:2)/Al is 0.85% with open-circuit voltage (Voc) 0.8V. Further improvement by manipulating polymer/electrode interface and further investigation of more polyfluorene copolymers with narrow band gap aryl-hetero cycle units on the side chain is in progress.
Research on Numerical Analysis of Landslide Cataclysm Mechanism Coal Mine
Authors: Kang Zhi Qiang , Wang Ying Chun , Nan Feng , Yuan Shi Lin , Yang Jiu Lin
Published: November 2011

This article according to the ShengLi Open-pit Coal Mine landslide and the slope project special details, used the FLAC numerical calculus analysis software to conduct the research to the landslide cataclysm mechanism, has carried on the optimized analysis to the reinforcement plan.Has obtained the pre-stressed anchor rope frame beam + high pressure splitting grouting reinforcement plan government landslide most superior processing plan through the numerical calculus, thus active control ShengLi Open-pit Coal Mine slope distortion destruction.
Analysis of Condensing Temperature Set Point of Air-Cooled Refrigeration System with an Electronic Expansion Valve
Authors: Zhou Zhi Gang , Zhang Hua
Published: November 2011

A method to determine the condensing temperature set point of air-cooled refrigeration system with an electronic expansion valve was discussed in this paper. This set point is fixed for a specific system and is based on the flow characteristic of the installed electronic expansion valve in variant opening and pressure drop. As common sense, at constant differential between condensing pressure and evaporating pressure, larger opening of expansion valve allows more refrigerant flowing through the expansion valve into evaporator. This feature offers an opportunity to lower the condensing temperature via increasing opening of expansion valve to enhance refrigeration efficiency and in the same time designed cooling capacity can be maintained at low ambient temperature. In this case it is supposed that the installed electronic expansion valve’s capacity was larger than the evaporator’s, and in fact that occurs frequently in refrigeration system designing. The benefits of this method could include: the capacity of electronic expansion valve is fully utilized, the refrigeration system will operate at a lower condensing pressure and the power consumption of compressor can decrease, hence the improvement of system efficiency is predictable.
Experimental Study of Integrated Vortex Board with Exergy Analyses
Authors: Song Fu Yuan , Ma Yi , Zhang Peng , Chen Yue Jin
Published: November 2011

The integrated vortex board was made up of many vortex chambers, it was the integration managed in individual vortex tube and its structure was more complicated. It could be regard as one and open ones mouth the system to study. In this paper, basing on the first and second law of thermodynamics, thermodynamics model was set up firstly , which was suitable for the exergy analyses of integrated vortex board energy separation, then the relationships of exergy efficiency and irreversibility were obtained. Combining with the experiment data , the exergy of the integrated vortex board was analyzed, in view of the effect of inlet pressure, cold mass, diameter of outlet orifice, length of hot tube, structure of entrance nozzle on energy separation effect and exergy efficiency. The dimension and operating condition of integrated vortex board could be optimized.
Multimode Adaptive Control for Tank Gun Control System Based on Tracking Differentiator
Authors: Yuan Dong , Ma Xiao Jun , Wei Wei
Published: November 2011

Aiming at the problems such as switch impulsion, insurmountability for influence caused by nonlinearity in one tank gun control system which adopts double PID controller to realize the multimode switch control between high speed and low speed movement, the system math model is built up; And then, Model Reference Adaptive Control (MRAC) method based on nonroutine reference model is brought in and the adaptive gun controller is designed. Consequently, the compensation of nonlinearity and multimode control are implemented. Furthermore, the Tracking Differentiator (TD) is affiliated to the front of controller in order to restrain the impulsion caused by mode switch. Finally, the validity of control method in this paper is verified by simulation.
Dynamical Integral Sliding Mode Control for Permanent Magnet Ring Torque Motor
Authors: Sun Bai Qing , Ge Xiu Wei , Sun Yi Biao
Published: November 2011

In view of the characteristics of numerical control turntable servo system directly driven by permanent magnet ring torque motor, which is susceptible to load disturbance and parameter variation, a dynamic-integral sliding mode position controller is designed. Dynamic sliding mode control means making differential operation to switching function of conventional sliding mode control, thus, a new switching function can be obtained. The discontinuous terms are transferred to first or higher derivative of control quantity. Therefore, the dynamic sliding mode control law is continuous timely, and then the chattering can be effectively reduced. Meanwhile, in order to ensure the steady-state accuracy of system, the integral term is introduced in the switching function to realize dynamic integral sliding mode control. The simulation results indicate that dynamic-integral sliding mode control of permanent magnet ring torque motor has favorable dynamic response and strong robustness, and it is effective to weaken the chattering.
Study of Pulsed Magnetic Field Generator for Magnetoacoustic Tomography Technology with Magnetic Induction
Authors: Li Yan Hong , Liu Guo Qiang , Li Shi Qiang , Xia Hui
Published: November 2011

On the basis of contrasting the research of home and abroad, this paper studies array magnetoacoustic tomography with magnetic induction as well logging new method. The paper introduces the design of the pulsed magnetic field for magnetoacoustic tomography with magnetic induction, analyses operational principle and parameters of charging system, introduces the operation mode of the discharging system in detail, the constitution of key parts circular plate coil, and realizes narrow width, high peak and repeat pulsed current with inductive load finally, and we obtained the distribution of the magnetic field. Magnetoacoustic tomography with magnetic induction combines the technology of Electrical Impedance Tomography and ultrasonic imaging, it can provide an impedance image with good accuracy and high spatial resolution, the method has a good prospect of application and extension in detection of resource, medical imaging and other fields.
The Impact of Surface Tension on the Oil-Water Stratified Flow
Authors: Xu Dao Zhen , Zhang Guo Zhong , Zhang Xin
Published: November 2011

The stratified water-oil two—phase flow was modeled using VOF method in horizontal pipe and surface tension was taken into consideration using CSF model. It was found that the surface tension had great impact on the small density difference two-phase flow even in large diameter pipe, which would lead the interface curved and pressure gradient increased.
Starting Performance of Novel Magnet Arrayed Permanent Magnet Synchronous Motor
Authors: An Yue Jun , Wen Hong Liang , Zhao Wen Qiang , Liu Guo Ming , Meng Zhao Jun
Published: November 2011

In order to improve the sinusoidal level of air gap magnetic field of the traditional surface PMSM, reduce its harmonic losses and fully reflect its energy-saving advantages, this paper introduces a type of sinusoidal pole width modulation permanent magnet synchronous motor. The surface magnetic poles of the rotor iron core constitute by a number of small array magnets, which makes the air gap magnetic field more sinusoidal. Placing starting winding in remaining space between array magnets of rotor outer surface to make surface-mounted permanent magnet synchronous motor add self-starting function. The sine wave distortion rate of air gap magnetic field of sinusoidal pole width modulation structure was compared with traditional surface-mounted structure by electromagnetic field calculation and experiment. The copper starting winding and aluminum starting winding were placed in sinusoidal pole width modulation structure motor respectively, and then the paper analyzes dynamic torque and rotational speed of self-starting progress. Finally the analysis is verified by experiments.
Research on the Microwave Propagation in the Evaporation Duct with Obstacles
Authors: Li Guang Cheng , Guo Li Xin , Zhang Tian Tian
Published: November 2011

The influence of the microwave propagation in the evaporation duct is studied by solving wide angle parabolic equation using Fast-Fourier transform method. Then, the result under smooth surface is compared with the simple and complex obstacle on the surface. It is shown that the propagation loss of electromagnetic wave will increase in evaporation duct with increase of the propagation path and the height obstacle, which effectively improves its remote propagation in waveguide after diffracting.
The Effect of Drag-Reducing Polymer on Heat Transfer in Gas-Liquid Two-Phase Flow
Authors: Liu Lei , Guo Qiu Yue , Guo Xin Feng , Fan Hui Qing , Zhong Zhu Hai
Published: November 2011

An experimental loop was established with API X52 steel pipes to investigate the effect of drag-reducing polymer on heat transfer in gas-liquid two-phase flow. The inner diameter of the steel pipe is forty millimeter and the test loop has four different test sections such as horizontal, inclined upward, inclined downward and vertical upward sections. The experimental results were presented. The relationship between the drag reduction efficiency and heat transfer reduction was analyzed. When the drag reduction induced by drag-reducing polymer is about 60~70%, the heat transfer between the fluid and the pipe wall obviously decreases. The heat transfer reduction can reach up to 80~90%, which is greater than the drag reduction. A new method is proposed for characterizing the effect of drag reducing polymer on the heat transfer in two-phase flow with Stanton Number.
Optimization of PMSM Sensorless Control Based on Improved PSO Algorithm
Authors: Qian Miao Wang , Tan Guo Jun , Li Ning Ning , Zhao Zhong Xiang
Published: November 2011

For the problem that manual adjustment of the parameters of controller in sensorless control system costs too much time, manpower and always can not get a good result, a new method based on improved particle swarm optimization algorithm is proposed to optimize the parameters. The improved algorithm is based on the standard particle swarm optimization with the simulated annealing algorithm and chaotic search brought in. The speed of motor is estimated by the extend Kalman filter. The error between measured speed and estimated speed of the permanent magnet synchronous motor rotor is used as the fitness function in order that the parameters in the covariance matrix is adjusted.The result of simulation indicates that high estimation precision can be got and the motor represents steadily with few of ripple of the actual speed.With this method, the time of adjustment is reduced and manpower is saved. In addition, the validity of the method is proved in experiment with dSPACE.