bluuebunny/crossref_metadata_2025 huggingface dataset:
Structural Stability Analysis of Dump Truck Body Based on ANSYS
Authors: Wang Guo Sheng , Si Jing Ping , Chen You Yu , Guo Li Na , Zhao Yu Nan
Published: November 2012

The force on dump truck body is telatively complicated, and different unloading working conditions will have effects on the body structure of dump truck. This paper made a modal analysis and feature buckling analysis of the body structure of dump truck under the unloading situation, and also made a nonlinear analysis under the certain circumstances. Through the ANSYS analysis, the body vibration frequency and buckling modal shape was calculated and figured out, and the design of dump truck body was optimized in order to make sure that the stiffness and stability meet the needs.
The Application of ANSYS Multipoint Constraint on the Combination Modeling of SOLID-SHELL
Authors: Zhang Bao Qin , He Jian Xia , Qiao Yun Fang
Published: November 2012

The problem of the modeling connection of different units is encountered in engineering practice. Its reasonable proposals are that the modeling is discrete into the respective discrete three-dimensional solid elements for calculation. But different types of units’ degrees of freedom are not discontinuity，it will lead to significant deviation of calculated results and the actual. In the paper, the methods and characteristics of SOLID-SHELL unit with the application of ANSYS constraint equations method and the MPC law are discussed, and compared the shell - solid element with the whole solid element modeling combined the results, it draw a conclusion that MPC law is advantage in modeling of three-dimensional solid element and shell element.
Experiment Study on Fatigue Strength of Used Type Zhuan 8G (Zhuan8AG) Side Frame under the Speed Increased Condition
Authors: Wang Hong , Shang Yue Jin , Liu Wan Xuan
Published: November 2012

The using zhuan 8G (zhuan 8AG) bogie in existing line whether can achieve the requirement of speed increased to 120 km/h, and what improvements and research became the railway sector need to face and solve importantly. Based on the experiment standard of new production and strengthened project, fatigue strength performance is studied on type zhuan 8G (zhuan 8AG) side frame used for some years when speed increases to 120 km/h. The static stress examination shows that the static strength of side frame is related to its structural design while has nothing to do with its using life. The fatigue test research indicates that the total state of used side frame is comparatively good, and the foreground used for 120 km/h is optimistic; and find that the corner of pile cap lower part(C position) is the weak site of side frame fatigue failure, the reason is closely related to the surface defect of this site. The recommendation is improving the quality requirements of this part of the side frame manufacturing technology and quality controlling document to eliminate the hidden dangers of fatigue source. Conclusions and suggestions may be referred to when competent departments make relevant decision, and offer contrast for relevant calculation study.
The Input Axis' Mode Analysis of the Four Ring-Plate-Type Cycloid Gear Planetary Drive
Authors: Zhang Xiu Yan , Dong Shu Jing
Published: November 2012

Use the input axis of the four ring-plate-type pin-cycloid double crank gear planetary drive as the research object, the natural frequency of the input axis is calculated in the transfer matrix method, using ANSYS software analyze modal of the input axis, the theoretical calculation and the finite element analysis mutual authentication, Find the vibration system which affect the modal position large.
The Study of Modified Effect on Planar Double Enveloping Worm Pair
Authors: Huang Xiang Mao , Cao Xue Mei
Published: November 2012

For the phenomenon that the transmission performance of primary-type drive in low drive ratio planar double enveloping worm pair is bad,we put forward a modified way to planar double enveloping worm pair ,which is base on the curvity modification principle of enveloped toroidal worm. The results show that if the modified parameter to conform to the curvity modification principle of enveloped toroidal worm,it will get a good modified result and the transmission performance was improved.
Particle Swarm Optimization for Identification of PEMFC Generation System Fuzzy Model
Authors: Ren Yuan , Zhong Zhi Dan , Liu Hong Xiao , Wang Xiao Hui
Published: November 2012

This paper proposes particle swarm optimization (PSO) for identification of the Proton Exchange Membrane Fuel Cells (PEMFC) generation systems fuzzy model. The PEM fuel cell generation system efficiency decreases as its output power increases. Thus, an optimum efficiency should exist and should result in a cost-effective PEM fuel cell generation system. The PEMFC generation system cost and efficiency fuzzy model were build, we use the PSO as an optimization engine to indentify the fuzzy model. The simulation results were presented and the results show that we may minimize the total cost of the generation system by using the PSO.
Research on Efficient Utilization of Sulphur Concentrate with Deep Flotation Method
Authors: Liu Dan , Wen Shu Ming , Cao Qin Bo , Shen Hai Ying , Deng Jiu Shuai , Xian Yong Jun
Published: November 2012

A technology of “depth cleaning- sulfuric and acid producing- residuals for ironmaking” is proposed for efficient utilization of sulphur concentration with high quality. The effect of the main factors involving grinding fineness, activators, collector type and dosage was investigated. On this regard, a close-circuit flotation test scheme was proceeded, by which a high quality sulphur concentrate was obtained with 52.39% of iron grade, 86.44% of iron recovery, 39.46% of sulphur grade and 91.52% of recovery sulphur. This concentrate can be directly used in the production of sulfuric acid and preparation of iron concentrate. This technology can be used to fully utilize sulphur and produce high quality concentrate as iron-bearing feed for steel industry, which will help to extend raw material sourcing for Chinese steel industry.
The Study on Control Strategy of Rail Pressure in the Starting Process for Common Rail Diesel Engine
Authors: Liu Xian Qiang , Du Jia Yi , Yuan Yin Nan , Zhu Lei
Published: November 2012

The analysis on the characteristics of each period in the starting process for common rail diesel engine was carried out. Rail pressure simulation model in the starting process was set by Matlab/Simulink. And rail pressure was tested in 4JB1 high pressure common rail diesel engine. The experimental results showed that idle rail pressure and engine speed fluctuated severely. Solution to correction of duty of metering unit(MeUn) at initial period was proposed, and effect of dragged laps on duty of MeUn was added in control strategy. The improved experimental results showed that amplitude of rail pressure fluctuation was very small and idle speed was no longer overshoot. The performance of diesel engine in the starting process has been greatly improved.
The Effect of Gasoline/1-Butanol Blends on Spark-Ignition Engine Performance
Authors: Qian Ye Jian , Chen Zhi Fang , Huang Wei , Zhen Tian Wei
Published: November 2012

Butanol has been considered an attractive alternative fuel for automotive engine. In the present study, a numerical study is conducted in a spark-ignition engine fuelled with blends of gasoline and 1-butanol at different fuel/air equivalence ratios. The effect of fuel/air equivalence ratio on engine performance is analyzed. The results show that the peak pressure and peak temperature increases with the increasing of fuel/air equivalence ratio. With increased 1-butanol proportion, the incylinder pressure and incylinder temperature gradually decreases. In addition, effect of fuel/air equivalence ratio on nitrogen monoxide emission is depended on the proportion of 1-butanol in blended fuels.
Fault Causation Analysis of Oil-Delivery Pump Based on Fuzzy Petri Net
Authors: Yue Jing Jing , Duan Li Xiang , Zhang Lai Bin
Published: November 2012

In oil-delivery pumps, impeller failure is a common cause leading to excessive vibration. This paper is aimed to analyze the fault causation of impeller failure in oil-delivery pumps by using fuzzy Petri net (FPN) theory. The longest path algorithm based on the forward reasoning was put forward and introduced into fuzzy Petri net. First, on the basis of various factors causing impeller failure, an FPN model of impeller failure in oil-delivery pumps was constructed. Then, by using the proposed algorithm, fault causation analysis of impeller failure was completed to calculate the credibility of impeller failure. Finally, the corresponding preventive measure was presented. The results indicate the key causing factor of impeller failure is mechanical impurities, and the credibility of impeller failure is 0.7342, which is consistent with the actual situation. The research finding demonstrates the flexibility and effectiveness of the FPN in fault causation analysis.
Accurate Control of Air-Fuel Ratio for Gasoline Engine under Idle Speed Condition
Authors: Liu Chang Wen , Ma Er Lin , Yang Yan Xiang
Published: November 2012

In order to achieve a good idle speed stability, emission and economic effect for spark ignition engine, the air-fuel ratio has to been controlled under idle conditions. In this paper, an engine model for a 125cc EFI motorcycle engine was established using the GT-power software, and a simulation and experimental study was performed when engine under idle speed condition. The result shows that there is a corresponding relationship between the idle speed and the air fuel ratio. An accurate control method for setting optimal working air-fuel ratio under idle speed condition can be obtained using the results of this study.
Research on the Detection and Amendment Method of the Fine Processing to Propeller of the Submarine
Authors: Mao Kai , Chen Pei Ren , Sun Yu Mei
Published: November 2012

Submarine noises, which mainly come from the propeller are the biggest threat to its survival, while the noises resulting from the propeller depend mainly on its 3d symmetry, the accuracy and roughness of its surface fine processing. In order to improve the accuracy and roughness of the fine processing, the detailed detection and amendment become quite difficult and also essential to the production of it. An optical detection and amendment method is put forward in this paper. The detection accuracy of this method can achieve the level of Nm, which is beyond the current production and detection standards at home and abroad.
Development and Application of Vehicle Electronic Throttle
Authors: Sun Jian Min , Yin Yu Bo , Zhou Ze Yang
Published: November 2012

The electronic throttle promotes the development of electronically controlled vehicle systems. The emergence of electronic throttle technology is in the United States in the 1980s.After that it is developed in Europe and Japan. As the technology advances and the cost reductions, the electronic throttle has been widely used in modern cars. China's electronic throttle technology comes from the introduction of technology, the core technology, however, still do not grasp. With the continuous progress of the domestic automobile manufacturers and domestic universities, electronic throttle has been applied in various models. In hybrid vehicles, the continuously variable transmission vehicles, the natural gas engines, diesel engines, and motorcycles，the electronic throttle is applied in research and obtain the corresponding scientific research. In the future of the car electric system, the electronic throttle will play an increasingly critical role and obtain the wide range of applications.
Design and Optimization of Low-Thrust Orbit Transfers Using Hybrid Method
Authors: Fu Lei , Xu Min , An Xiao Min , Yan Xun Liang
Published: November 2012

A low-thrust guidance scheme, which is weighted combined by taking the optimum strategy of thrust allocation and the target deficits value into consideration for each orbital element, is developed. The presented guidance scheme is predictive in nature and does not rely on a stored reference trajectory or reference controls. The orbit transfer problem is converted into parametric optimization and utilizing a hybrid genetic algorithm. The minimum-time orbit transfer is considered. The influence of the Earth’s oblateness is taken into consideration in the simulation of minimum-time. A conclusion is drawn that the designed method presented here turns out to be an autonomous scheme because the information of target orbit is considered in the transfer process.
Effects of Trichloroethylene on the Wastewater Treatment in Membrane Bioreactors
Authors: Ding Yuan Hong , Wang Qing , Ren Hong Qiang , Lu Jian
Published: November 2012

The activities of nitrifying bacteria and organic utilizing bacteria against TCE in sludge was investigated using three series of Membrane bioreactors, and the results indicated that, the removal efficiencies of COD decreased gradually, but was not affected severely with TCE inhibition, good organics removal efficiencies was possibly realized, while the ammonia removal efficiencies dropped sharply due to the severe inhibition of TCE against nitrifying bacteria, the degree of TCE inhibition against nitrifying bacteria increased with the TCE concentration, but low-concentration TCE addition seems act as a chronic toxicity to the sludge activity, However, the nitrifying bacteria was gradually adapted to the TCE inhibition and its activities could be entirely resumed, and the ability of the nitrifying sludge to tolerate TCE could be satisfactory maintained either after the stop of TCE addition, therefore, TCE could be degradated partly by the nitrification processes, when the TCE was added intermittently and continuously into the Membrane reactors, simultaneously, a good performance of nitrification and organic utilization processes was possibly maintained stably.
Simulation Research on Dynamic Performance of Electric Vehicle Based on ADVISOR
Authors: Wang Xing , Qin Dong Chen , Zhu Jun
Published: November 2012

The research of the dynamic performance is particularly important so as to improve the performance of electric vehicles. The method of computer modeling and simulation can be used to reduce the expense and shorten design cycle. The theory of dynamic performance standards of electric vehicle performance is introduced, and then, the main component of electric vehicle and the whole vehicle model are built up based on the advanced vehicle simulation software ADVISOR platform, which is developed by U.S. National Renewable Energy Laboratory. The curve results of the dynamic performance are obtained after the simulation of virtual electric vehicle, and it is consistent with the actual vehicle movement. At the same time, the simulation results can be served as essential reference for development and improvement of new vehicles.
Vehicle Performance Simulation of Electric Bus with Composite Power Supply Based on Secondary Development of Advisor
Authors: Pei Dong Jie , Qin Dong Chen , Wang Xing , Liu Jiu Shi
Published: November 2012

In order to improve the performance of the electric buses，composite power system is designed，which is analyzed and verified by the simulation using the software of Advisor. Advisor is secondary developed by updating assembly simulation models and vehicle models. The basic structure of composite energy storage system and the control strategy based on fuzzy theory are designed, and the simulation of vehicle performance is done under the road cycle of UDDS, and then compares with the bus with only batteries. The result shows that ultra-capacitor has a prominent "clipped peak and filled channel" protection for the battery, recovers energy commendably, and extends the battery’s life. The electric bus with composite power supply can meet the requirement of vehicle performance, and its indexes of all aspects are better than the electric bus with only batteries.
A New Circuit Model Detection Method via Electromagnetic Scanning
Authors: Xu Wen Dan , Ma Ping Li , Jiang Jian Guo , Tian Yuan
Published: November 2012

Due to the high frequency, high density and high reliability requirements, as well as the difficulty of assembly, the lower qualified yield and the higher returning rate of the high density circuit module etc, a new testing method of high-density circuit module detection by electromagnetic scanning was present in order to realize comprehensive and efficient high-density PCB detection. Firstly, the standard board and tested board were scanned to get their electromagnetic information which was further used to compare and get their differences. Then the suspected faulty areas can be found according to the difference of the electromagnetic information. Finally, the suspected faulty components would be positioned referring to the high-density PCB design files. The simulation results show that the method based on electromagnetic information is feasible in high-density circuit module detection and has a higher detection rate.
Fault Tree Analysis of Vehicle Charging System
Authors: Ma Jian Wei , Yin Wan Jian , Ma Jin Gang , Ji Qing Shan
Published: November 2012

The composition and function of vehicle charging system are analyzed, and basic theory of fault tree analysis method is introduced. The qualitative analysis of its reliability is carried out. Fault tree model of vehicle charging system is built, the minimum cut sets are solved and the key parts are found out. Through quantitative analysis, the occurrence probability of top event and importance of bottom event are solved, which provides theoretical basis for fault diagnoses of vehicle charging system, saves time of fault diagnoses and reduces unnecessary disassembly.
Optimization Design of Electromagnetic Ultrasonic Transducer
Authors: Yang Li Jian , Li Chun Hua , Gao Song Wei
Published: November 2012

In order to improve the energy transduction efficiency of electromagnetic ultrasonic transducer (EMAT), a 2-D simulation model for the electromagnetic ultrasonic transducer is established and optimized. Aiming at the main object in EMAT optimization, the analysis of the impact that the coil and the lift-off distance of the tested pieces, incentive coil and various parameters of the permanent magnet have on the energy transduction efficiency is conducted. Ultimately, the optimum combination of the incentive coil parameters is determined.
Design of a Single Load Li-Battery Contactless Charging Platform with Frequency Tracking
Authors: Zhao Zi Ming , Yao Ying Ying
Published: November 2012

Wireless energy transfer system uses separable mutual induction coil to transfer energy. According to the load characteristics of rechargeable batteries, the primary and secondary sides constitute the resonant circuit with series compensation to improve power factor and transmission capability of the system. The high frequency signal source circuit of the primary side uses frequency tracking to make the system working accurately at the resonant state. The primary side current keeps constant to make system stable. The system parameters are given optimized under the loosely coupled condition considering voltage gain, frequency bifurcation phenomena and the limit of the size of the secondary side, etc.
Design an Unscented Kalman Filter-Based SoC Estimator for HEV Application
Authors: He Hong Wen , Zhao Kai , Xiong Rui
Published: November 2012

An unscented Kalman filter (UKF) is adopted to estimate the state of charge (SoC) of a lithium ion battery for application in hybrid electric vehicles (HEVs). Generally, the extended Kalman filter (EKF) can be selected to estimate a non-linear system state. However, it may leads to large errors since the strong non-linear and stochastic performance. In this paper, the performance of the lithium-ion battery is tested by a design of experiment, such as hysteresis, polarization, coulomb efficiency, etc. And a combined battery model is selected for SoC estimation, while the model parameter was identified by using UKF algorithm. Finally, the federal urban driving schedule (FUDS) is used to evaluate the proposed method accuracy. And the results show that the maximum SoC estimation error is less than 3%.
Development of Inverter for Electric Propulsion Motor of Ship
Authors: Nie Zhen Yu , Guo Xiao Bin
Published: November 2012

The paper presents the design of three-level variable-frequency power supply device which is used in electric propulsion system of ship The variable-frequency power supply device is controlled by the DSP chip TMS320LF2407, and inverter is neutral point clamped three-level inverter circuit which is consisted by IGBT, and it’s controlled by SVPWM modulator approach to determine switching elements making or breaking. In order to keep the balance of neutral voltage, the paper presents to use the method that two equivalent switch state of short vector work alternatively to cut down the variable quantity of capacitive, and to achieve the voltage balance. Rotor flux orientation vector control of torque closed loop control has taken in the speed control system of propulsion motor. The whole variable-frequency power supply device has some strong points such as working reliably, dynamic response fastly, current ripple small and less harmonic content of output voltage, etc, it has some practical value.
Photo Electrochemical Responses of Titanium Oxide Nanotube Arrays on Pure Titanium Substrate
Authors: Yu Feng Qin , Dong Min , Yi Ya Li
Published: November 2012

This paper deals with photo electrochemical responses of titanium dioxide nanotubes on pure titanium. Photosensitive electrodes (anodes) with the major composition of doped oxides were made using the titanium oxide nanotubes. The responses of the oxide nanotubes with different additives to both ultraviolet (Uv) and visible (Vis) light were illustrated. Research results of the enhance absorption of visible light by adding transition metals or metallic oxides including Co, Ni, Cu, Zn, CoO, CuO, NiO, ZnO into the nanotubes will be shown. Finally, test results of the photo electrochemical fuel cells using diluted glycerol as the fuel under the irradiation of natural light will be presented and the open circuit voltage values will be given. The photo electrochemical test results show that the doped titanium oxide nanotubes show the n-type behavior. The photo anodes can absorb both ultraviolet and visible light. But the response to the ultraviolet light is five to ten times stronger.
The Filtering Device under Improved Direct Current Control
Authors: Zhao Ying , Ji Jin Shan , Du Nai Cheng
Published: November 2012

This paper mainly describes the mechanism and elimination method of harmonic in low-voltage power grid. Improve direct current control method in the traditional filter method,filtering the harmonic and timely compensating reactive power in the grid. On this condition, it can make the power grid safe and stability. At the same time simulate the improved direct current control method, and the results verify the correctness and rationality of the control method.
Construction of Experimental Platform for Multi-Motor System Synchronization Control
Authors: Zhang Jin Zhao
Published: November 2012

According to the three-motor synchronous system, S7-300PLC is as the controller .The three-motors synchronization control platform is constructed based on PC monitoring configuration software of WinCC, so the combination of drive, testing, monitoring, communications and other systems are optimized. The programming software for the lower computer is STEP7V5.3 which supports S7-300PLC.In addition to the hardware configuration, parameter setting, the communications configuration and programming, its function includes starting, maintenance, operation and diagnostics, etc. Then, the system can not only run under the operating system WIN2000/XP matching with the Windows graphical and object-oriented operating principles, but also be provided online debugging capabilities. In the preparation stage of experiment, in order to making the algorithm implementation high accuracy and strong rapid real-time response, the data sample has been optimized to fully reflect the dynamic and static performance of the original system.
Study on the Direct Current Control Method Based on the d-q Transformation
Authors: Zha Cong Mei , Xu Qi Ying , Zhu Yong Sheng
Published: November 2012

Static var generator (SVG) basic principle and control method are introduced in the article, a direct current control method for SVG is put forward based on d-q transformation, this method is also analyzed from theory and made simulation model, the simulation results show that this control method is reasonable and effective.
Preparation and Utilization of Lignin Ionic Adsorbent for the Removal of Cr(VI) from Aqueous Solution
Authors: Cheng Ze Sheng , Wang Zhen , Liu Yu , Bo Na Na
Published: November 2012

Alkali lignin, Modification, Quaternary ammonium salt, Cr(Ⅵ), Anion adsorbent Abstract. LIA(lignin ionic adsorbent) was synthesized by modified alkali lignin after reaction with epichlorohydrin and dimethylamine or diethylamine by using the modifying agents of N-methylmorpholine (NMM) in the presence of organic medium of N,N-dimethylformamide(DMF). The LIA was characterized by FTIR spectroscopy and elements analysis， the yield of products and the adsorbent capabilities for Cr(Ⅵ) from aqueous solution were also exploited. The factors that might influent the adsorption performance were investigated, such as adsorption time, reagent dosage and the initial concentration of Cr(Ⅵ). It was found that the efficiency of Cr(Ⅵ) removal were better when the amount of the sorbent was increased. But the removal efficiency was reduced as the initial concentration of Cr(Ⅵ) increased. The contrast result of the two synthesis processes also proved the yields of sample 3 (modified alkali lignin using diethylamine) was higher than sample 2 (modified alkali lignin using dimethylamine). And the adsorption capabilities of sample 3 were also better than sample 2.
Harmonics Analysis and Countermeasures for Power Factor Compensation Experiment
Authors: Han Bing , Liu Yan Xia , Yang Fu , Han Feng , Liu Yuan Yuan , Nang Jing Yu
Published: November 2012

This paper mainly focuses on harmonics suppression in power network. Led to by the problem of the fluorescent lamp circuit power factor, the harmonics are recorded by the analysis instrument SR760 about their influence on the circuit current. The method of filtering the harmonics with second-order filter circuit was put forward and then the waveform was simulated after filtration with the simulating software called Pspice, and thereby checks the filtering effects.
Based on LabVIEW Resistance Method Temperature Testing for Traction Transformers and Motor Winding
Authors: Wang Yu Hua , Wang Peng Yu , Zhang Guo Qing
Published: November 2012

Temperature is an important parameter for the characterization of the transformer and the motor running. Winding temperature test according to the actual operation of the traction transformer and motor temperature protection device requirements, in-depth study, temperature test of the traction transformer based on virtual instrument and traction motor winding resistance method, the method using LabVIEW to develop test software, respectively, for data acquisition, data playback, data analysis and processing, data file management functions, and temperature test equipment, not only real-time test system, but also post-processing the data after the test, in order to analysis of the factors that affect the temperature of the windings. Validity of the method is proved by experiments.
Improvement of Boost Circuit Based on Fly-Back Switching Power Supply
Authors: Chen Ying , Li Liang Hong , Li Zhi Yong
Published: November 2012

A kind of self-couple transformer voltage-elevating fly-back circuit topology is presented in this paper, and analyses the operating principle in detail. A voltage-elevating fly-back type DC-DC convertor based on theory is designed. Finally, the feasibility of self-couple transformer voltage-elevating fly-back circuit is testified by experiment.
Optimization of Rotor Angle Signal for Permanent Magnet Synchronous Motor
Authors: Ji Xue Wu , Tian Hong Liang , Liu Ya Hui , Sun Ning
Published: November 2012

In the design of an electric power steering system (EPS), the smoothness of assistant torque is one of the key performances. In order to reduce the torque ripple caused by the low precision of low-cost angle sensor embodied in the system and to improve the steering comfort, this paper analyzed the influence of low cost angle sensor on the torque ripple of a permanent magnet synchronous motor (PMSM), and optimized the rotor angle signal with speed recursion method and Kalman filtering method. The optimization results of the two methods were compared, and the experiment results showed that Kalman filtering method can optimize the angle signal better.
Inertia Compensation of EPS Based on Kalman Filtering
Authors: Ji Xue Wu , Sun Ning , Liu Ya Hui
Published: November 2012

The dynamic performance of an electric power steering system (EPS) is deteriorated by the inertia of assistant motor embodied in EPS. To compensate the effect of motor inertia and improve the dynamic performance of EPS, the angular acceleration of the motor rotor is needed. However, the angular acceleration cannot be derived by differentiating the rotor angle signal of the permanent magnet synchronous motor (PMSM) directly, for the noise will be amplified. This paper attempts to get motor angular acceleration signal through Kalman filtering method and the angular acceleration signal acquired by this method is calibrated with high precision encoder, furthermore, the signal is verified though simulation and experiment of inertia compensation control. All the calibration results and simulation and experiment results of inertia compensation control show that the angular acceleration acquired through Kalman filtering method is available for the realization of motor inertia compensation control and can achieve the purpose of improving the dynamic performance of the steering system.
Analysis and Calculation of the Normal Force Fluctuations of Permanent Magnet Linear Synchronous Motor
Authors: Shen Li , Ning Jian Rong , Xia Jia Kuan , Cao Jing Quan
Published: November 2012

Permanent Magnet linear synchronous motor (PMLSM) exist the problem of normal force fluctuation, especially in the servo feeding system of high-precision CNC machine tools. The normal force fluctuation can cause the feeding table in vibration and produce resonance with other moving components of the servo feeding system. It is produced by normal electromagnetic force wave acting on iron cores of PMLSM. In this paper, the analytical expression of normal electromagnetic force wave of single-side PMLSM is deduced with the method of MMF (magnetomotive force) magnetic permeance. And based on this, analyze composition and classification of the force wave component; the further study of the influences to the force wave order and amplitude when the coefficients of the electric machine are changed is done. Then, base on a PMLSM with 6 poles and 36 slots, the results of analytic calculation are accordant with the FEM simulation ones. These results prove the analytical expression is correct and accurate.
Research on the Claw Pole Machine with Outer PM Rotor Driven by Trapezoidal Current
Authors: Zhang Feng Ge , Gao Jin Xiang , Liu Guang Wei
Published: November 2012

The claw pole machine with outer permanent magnet rotor (CPMPM) is a special kind of the claw pole machine. The trapezoidal current drive as a new drive in this motor is a new attempt. On the basis of analyzing its structure, material, characteristics and operating mechanism have proposed a new conduction manner of the trapezoidal current drive；For this machine is not easy to place position sensor, a new function of rotor position-based approach has been put forward to estimate the rotor position in this paper. It has been show that this method can accurately and quickly estimate the rotor position by simulation .It has been prove that this method has good dynamic and static performance.
Changes of pH in A2O Process System and its Impact on Nitrogen and Phosphorus Removal
Authors: Li Yong Feng , Yang Jian Yu , Zhang Guo Cai
Published: November 2012

Simulate sewage were used in an anaerobic-anoxic-aerobic biological nutrient removal system(A2O process), by observing the pHs in different compartments and its reflected changes in nitrogen and phosphorus removal, studied on the effects of different pHs on the removal of pollutants. The experiments indicates that the anaerobic phosphorus release showed the main performance of the decline of pH, denitrification in anoxic zone caused the rise of pH, uptake of phosphate in the aerobic zone mainly caused the continuous rise of pH. There is no evidently changes in COD removal, ammonia nitrogen get the highest removal as the pH value was between 8.0-8.5, when pH was at 6.5-7.5, the TN have the maximum removal rate, TP can keep in a high level when the pH was above 6.0.
Research on Voltage Regulator System of Aircraft Power Generation System
Authors: Bo Liang , Li Yu Ren , Xu Lei , Lu Jiu Li
Published: November 2012

The paper analyzed the composition of the aircraft synchronous generator system. The simulation model of the three-stage synchronous generator is established in the environmental of MATALB according to the motion equation of generator and coordinate transformation. Proposed a control algorithm based on the Sliding-mode Variable Structure Control (SVSC) theory after analyzed the conventional control algorithm of voltage regulator. Particularized the realized method of the SVSC algorithm is proposed. Simulation of both control algorithms were conducted under MATLAB. Simulation results indicated the validity of the SVSC algorithm and advantages against conventional control algorithm.
Reactive Power Compensation and Configuration of Wind Farm
Authors: Li Shao Bo , Li Lin Chuan , Zhang Lei , Sun Qian
Published: November 2012

Wind turbine absorbs reactive power while generating active power. Seriously, it causes voltage drop or even voltage collapse. It is needed to compensate reactive power. In this paper, a combination of capacitor bank and SVC is used in wind farm. Equivalent circuit of two kinds of wind turbine is described firstly. Then, equation of reactive power and active power is derived. Then an optimization method is used to calculate capacity of capacitor bank and SVC. Finally, load flow of IEEE14 system with a wind farm connected to it is calculated to verify the effect of reactive power compensation.
Improving Active Output Capacity of Large-Scale Wind Farm by Installation STATCOM
Authors: Wu Yan Juan , Li Lin Chuan
Published: November 2012

Some faults will result wind turbine generators off-grid due to low grid voltage , furthermore, large-scale wind farms tripping can result in severe system oscillation and aggravate system transient instability . In view of this, static compensator (STATCOM) is installed in the grid containing large-scale wind farm. A voltage feedforward control strategy is proposed to adjust the reactive power of STATCOM compensation and ensure that the grid voltage is quickly restored to a safe range. The mathematical model of the doubly-fed induction wind generator (DFIG) is proposed. The control strategy of DFIG uses PI control for rotor angular velocity and active power. 4-machine system simulation results show that the STATCOM reactive power compensation significantly improve output active power of large-scale wind farm satisfying transient stability, reduce the probability of the tripping, and improve the utilization efficiency of wind farms.
Run Real-Time Monitoring of Wind Power Generation System Based on WSN
Authors: Hu Lan Xin , Cai Cheng Hua , Tian Xia Fen , Fan Ying , Jia Jian Hao , Wei Chun Lei
Published: November 2012

In this paper, the wind power generation monitoring system hardware research, design a real-time monitoring the operation of the air handling unit, based on wireless sensor network. Use of wireless sensor networks to collect relevant data, data analysis and processing of the MCU as the core components, combined with a GSM module, Zigbee module for wireless transmission of data to achieve the purpose of real-time monitoring.
Research on Wind Turbine Blade Static Loading System and its Variable Traction Control Mode
Authors: Zhang Lei An , Huang Xue Mei , Wei Xiu Ting
Published: November 2012

According to MW-class wind turbine blades loading system requirements, the load requirement of traction apparatus under the different operating conditions were discussed. At the same time, the variable traction feature of traction apparatus was analyzed. A multi-node hydraulic loading system based on CAN bus was designed in this paper. In order to improve the precision of traction and the following performance of loading system, opting for the “V-F” control mode, we proposed the variable proportional separate integral control algorithm with amplitude limit to enhance the system's adaptive capacity. Experiments show that this program has a good coordination feature in the variable traction control, and fully meets the requirements of blade loading test.
Complementary Power Controller of Wind-Solar Energy Based on Soft Switch PWM and Parallel Balanced Current Technology
Authors: Zeng Chun Nian , Chen Hua Gui , Bao Yue
Published: November 2012

The demand of energy is increasing in today's society, to explore and utilize new energy sources is significant, especially as wind and solar energy can be reused. Today, the exploitation technology of solar-wind energy in countries is mature, however, there has always been weaknesses, eg: high development costs, low energy harvesting efficiency, poor control stability, such as the high cost of manufacturing solar panels and the limit of large power devices on the controller efficiency and power. In view of these difficulties above, this paper presents a method of resonant drive, all flow control to solved the problem of the controller's power and efficiency and improve the utilization ratio of battery board, and also reduce panels production cost indirectly. It is in line with national energy-saving emission reduction requirements. Finally, I used the technology to develop some stable products successfully, which are used in the field of communication base stations.
Research on Verification Device of DC Electrical Energy Meter for Electric Vehicle Charger
Authors: Xu Zi Li , Wang Tie Jie , Lei Min , Zhang Jun , Zhu Kai
Published: November 2012

With the increasing demands of electric vehicles, many DC electrical energy meters for vehicle battery charger appear. In this paper, a verification device of DC electrical energy meter is developed that base on real-time pulse period compare method, which used PCI-6281 for data acquisition, used LabVIEW for data processing and human-computer interface. This article describes the working principle of the verification device and core technology. The practical application verify the device can use for calibration of DC electrical energy meter efficiently.
Design of Changeable Range Voltage Monitoring Recorder
Authors: Wang Dao Shun , Kong Yuan Yuan
Published: November 2012

In order to improve the performance requirements of voltage monitoring recorder, this article introduces the voltage monitoring recorder based on Atmega32 MCU system.According to the input voltage value choose high or low reference voltage to ensure the 10 conversion accuracy, realize the design of changeable range voltage monitoring recorder. The instrument has low cost, high reliability, high storage capacity.
New Challenges Implementing Cognitive Radio in Wireless Sensor Networks: A Survey
Authors: Wu Yan Ling , Zhang Li Juan , Li Ming
Published: November 2012

With the growing demand of wireless applications, radio spectrum has become a scare resource. Cognitive Radio (CR) technology has been considered as an important solution to optimize the utilization of natural frequency spectrum. Numerous researches are performed on deploying CR in cellular networks. In this paper, we introduced new challenges on integration of CR technology and Wireless Sensor Networks (WSN), and some potential solutions are proposed.
CMOS Image Sensor Performance from Different Order of Interpolation and Noise Reduction
Authors: Li Xuan , Han Xiao , Qu Le Le , Guo Rui
Published: November 2012

Three noise reduction programs based on Color Filter Array (CFA) image from Complementary Metal-Oxide-Semiconductor (CMOS) image sensor system are proposed. Imaging performance from different order of interpolation and noise reduction is researched. The relevant models are established and three interpolation methods and four noise reduction methods are selected in the paper. The results show that under different imaging sequence, whether from objective evaluation or from the subjective point of view, Linear Filtering noise reduction is the worst, noise reduction on Least Squares Method is optimal. The conclusions have references to digital camera imaging.
A Study on Mechanical Lubricant Wastewater Treatment by Carbonized Rice Husk
Authors: Chen Yue Fang , Xu Si Yu , Guo Hao , Xu Hao , Qu Xiao Yan , Cao Li Xia
Published: November 2012

After carbonized at different temperatures, agricultural waste-rice-husk, becomes carbonized, which has further been modified at different pH values. Through some static tests, we studied the treatment efficiency for the wastewater--containing mechanical lubricants- by the carbonized rice husk at different amounts of carbonized rice husk, different treatment times and different processing temperatures. The results showed that the optimal carbonization temperature of the rice husk is around 500°C, and the pH modification’s impact was not notable. The optimal conditions of the treatment of wastewater containing 10% mechanical lubricant (volume percentage, made by Shell), were found at the amount of 6g/l carbonized rice husk, with the processing time of 15 min, and the temperature of 15°C. Under that condition, the oil removal rate could reach 88.38% and adsorption capacity of the carbonized rice husk is 22.32ml/g; however, when referring to Mobil (model: 20W-40), the oil removal rate could reach 94.24%, which is considerably superior to other kinds adsorbents. Treatment of oily wastewater by carbonized rice husk is in conformity with the second order kinetic equation, and the related coefficient is 0.9671; besides, the adsorption thermodynamic analysis shows that the adsorption process can be spontaneous at the low temperature, which therefore can be used for the oily waste water treatment.
A Novel Sensor Less Control of Induction Motor Based on Fuzzy Sliding-Mode Structure
Authors: You Xiang Yang
Published: November 2012

A novel fuzzy sliding-mode structure has been proposed for Extend Kalman Filter (EKF) based on sensorless control of an induction motor in this paper. Fuzzy sliding-mode structure includes two nonlinear controllers, one of which is sliding mode type and the other is PI-fuzzy logic based controller. The new structure has two advantages: sliding-mode controller increasing system stability and PI-like fuzzy logic based controller reducing the chattering in permanent state. The scheme has been implemented and experimentally validated.
Analysis of Circuit Parameters of Eddy Current Sensor
Authors: Zong Ming , Cheng Jian , Sun Yi Dan , Dai Zhao Hui
Published: November 2012

In order to improve the sensitivity of the eddy current sensor, a sensor measuring circuit based on the resonance method is designed in this paper. The working principle of eddy current sensor is introduced, the relationship between output voltage and inductance value is obtained by the analysis of the resonant circuit parameters, and then simulated by MATLAB software. Circuit parameters are optimized, and the various circuit parameters are obtained under the condition of considering the highest value of the linearity and sensitivity.
A Novel Nano-Scale Multi-Finger MOSFET DC Model Parameters Extraction Method
Authors: Ren Zheng , Zhang Long , Hu Shao Jian , Wei Zhou , Shi Yan Ling
Published: November 2012

A novel Nano-scale scalable multi-finger RF MOSFET model extraction method is presented in this paper. First, Parasitic resistances induced by measuring probe are analyzed, according to which the extraction method of parasitic probe resistor are proposed. Secondly, it is proved that stress effects on the MOS channel scale with finger number. Moreover, Based on experiment data, it is concluded that several MOS instances, finger numbers, channel width and length highly affect the parasitic source and drain resistance of Multi-finger MOS. An empirical scalable model on them has been suggested. A complete flow of model parameters extraction and optimization on nano-scale multi-finger MOSFET is presented.
A Parameter Estimation Method for Poly-Phase Coded Signal Based on the Modified Fractional Fourier Transform
Authors: Zhang Guo Yi , Zhang Xu Zhou , Li Jia Na
Published: November 2012

To estimate parameters of poly-phase coded radar signals, a modified Fractional Fourier transform (FrFT) is advanced. This algorithm employs Integrated Quadratic Phase function (IQPF) to estimate frequency rate with which the best degree for Frft is computed. Its computational cost is lower than that of Radon-Wigner transform (RWT) and Radon-Ambiguity transform (RAT). When the signal-to-noise ratio (SNR) is -7 dB, Simulations show its parameter estimation performance closes to the Cramer-Rao Lower Bounds (CRLB).
Three-Channel High Temperature Superconducting Filter
Authors: Gao Wen Bin , He Li Juan , Ji Lai Yun
Published: November 2012

A three-channel high temperature superconducting filter is designed for channelized receiver front-end systems. The principle and equivalent model of the filter has been demonstrated. There is 6-pole for each channel of the desired three-channel filter. The bandwidth of each channel is 40MHz.The simulation result is good agreement with theoretical analysis, illustrating the feasibility of this design. Such a structure of high temperature superconducting filters will have a wide application in communication fields
Wholly ICA Based Estimation on DOA of Spatio-Temporal Sources
Authors: Chang Yong ping , Jiao Wei Dong
Published: November 2012

A class of methods is presented for wholly estimating direction of arrival (DOA) of convolutively mixed sources in the frequency domain, which is based on independent component analysis (ICA). Convolutive mixtures of multiple sources in the spatio-temporal domain are firstly reduced to instantaneous mixtures by using the well-known short-time Fourier transformation (STFT) technique. From the time-frequency mixture in each frequency bin, one frequency respond matrix of the mixing system from sources to sensors is identified by some instantaneous ICA algorithms. Furthermore, DOAs of the multiple sources is estimated by using a whole estimating strategy. Consequently, all mixtures in total frequency bins contribute to a final estimation set, in which the source directions are shown as several direction clusters and/or local maxima. Experimental results indicate that the ICA based methods have some advantages over the well-known MUSIC (MUltiple SIgnal Classification) method not only on estimation precision of multiple source directions, but also on potential applicability under some especial conditions.
Experiment Investigation of the Temperature Characteristics of 975nm SLD
Authors: An Hong Bo , Su Bing Hua , Niu Li Hong
Published: November 2012

The output optical power and spectra of a 975 nm semiconductor laser diode (SLD) were measured and analyzed when the SLD was operated with different current in the temperature range of -10°C—65°C. The results showed that the output center wavelength of the SLD shifts in the direction of long wavelength as the operation current and temperature rises. The slopes were approximately 0.24nm/100mA and 0.36nm/°C, respectively. Furthermore, the Conversion efficiency of the SLD was higher when the temperature was low. The reasons for the red shift of SLD was theoretical analyzed.