bluuebunny/crossref_metadata_2025 huggingface dataset:
A Voltage Mode Control Maximum Power Point Tracking for Stand-Alone Photovoltaic System
Authors: Jamri M.S. , Kassim A.M. , Hashim M.R.
Published: March 2013

The purpose of this paper is to discuss a modeling and control of stand- alone photovoltaic system using voltage mode control maximum power point tracking (MPPT) method. The PV module was modeled based on the parameters obtained from a commercial PV data sheet while voltage mode control was modeled using simulink block model. A DC-DC boost converter was chosen to step-up and regulates the input DC voltage of the PV module. The voltage mode control (VMC) maximum power point tracking model was simulated and compared with perturb and observe (P&O) maximum power point tracker in order to validate the performance of output results. Results showed that the voltage mode control maximum power point tracking model yields the similar performance as produced by the photovoltaic system controlled by perturb and observe maximum power point tracking algorithm. The simulation is made to analyze the voltage, current and power generated under the changing irradiant and temperature condition. As a conclusion, the voltage mode control technique is possible to implement which yields the similar performance as the results from conventional MPPT method.
Comparison of Two Controllers PI and IP of the Voltage of a Two Inverters UPQC
Authors: Rahmouni A. , Benachaiba C.
Published: March 2013

This work is a study of UPQC in a transient regime, using a new method of identifying disruptive currents based on continuous power, with a comparison of performance of two controler PI and IP of the two voltage inverters. The results of this work showed that this new method is very efficient, and the regulating IP has be able to keep the value of the continuous tension to the close to his value of reference.
Finite-Time Control for Switched Discrete-Time System
Authors: Xiang Wei Ming , Zhao Yong Chi
Published: March 2013

Finite-time stability concerns the boundless of system during a fixed finite-time interval. In this paper, the problem of finite-time stabilization for switched discrete-time systems is addressed. Both the fast switching and slow switching case are considered. In fast switching case, the designed state feedback controller combines controllers for each subsystem and resetting controller at switching instant, it is shown that the resetting controller can reduce the conservativeness on controller design. Under slow switching, state feedback controller is designed with admissible average dwell time. Several numerical examples are given to illustrate the proposed results within this paper.
Automatic Spectrum Control System Design and Implementation for RGB Light Emitting Diode
Authors: Sun Tai Ping , Li Jia Hao , Li Kai Yan
Published: March 2013

This paper designs an automatic spectrum control circuit when the temperature change the LED spectrum can maintain stably. Automatic spectrum control circuit has two control modes, one kind for red LED another kind for green and blue LED. When temperature increases that the LED spectrum are all toward long wavelength shift. When LED current increases, the R-LED spectrum to the long wavelength shift, the GB-LED spectrum to the short wavelength shift, so at R-LED is to reduce the current as the automatic spectrum control circuit and the GB-LED is to increase the current as the automatic spectrum control circuit. It is confirmed that the proposed system provides stable spectrum within a temperature range of 10°C at R-LED and a temperature range of 70°C at GB-LED.
Application of Direct Feedback Linearization Control for Permanent Magnet Synchronous Generator Based Wind Energy Conversion System
Authors: Wu Wang
Published: March 2013

Direct feedback linearization control was applied to permanent magnet synchronous generator (PMSG) wind energy conversion system (WECS), which was to reduce the cost of wind energy conversion system and improve its performance. The PMSG-based wind energy conversion system was constructed with mathematical models of aerodynamics subsystem, drive train subsystem and simplified electromagnetic subsystem. With feedback linearization control theory based on differential geometry, the coordinated transformation and nonlinear state feedback were obtained and PMSG wind energy conversion system was linearized. With MATLAB/Simulink platform, the model and control strategy was established and the simulation result shows this control system with feasible speed tracking performance, which can effectively implement maximum energy capture.
Design and Analysis of High-Tension Lines De-Icing Device
Authors: Zhao Yu Qian , Zhang Mei Ling , Ma Lian Jie
Published: March 2013

To overcome the problem of the de-icing for high-voltage wire which is nowadays done artificially and dangerously, a kind of impact type de-icing device was designed in this paper. A cam and de-icing tool are designed specially for the device. The device can conduct deicing operation automatically and realize the automatic reciprocating walking on the transmission line. In conclusion, the impact type de-icing device for transmission line can effectively solve the problem of the ice coating on the transmission line and has a large value of reference and promotion.
Vertical Analysis Based on the Fault Data of Running Smart Meter
Authors: Liu Jin Shuo , He Xin , Li Shao Teng , Hong Hong Ming , Hu Kun , Wu Hui
Published: March 2013

As the main tool of electricity measurement and economic settlement, the smart meter directly related to the nation and peoples interests. This paper devises a vertical analysis model of fault data of running smart meter. The model firstly clean the useless data, then do the regress analysis, and get the fault data and changing rate of the fault of each batch, which are utilized to do the cluster to evaluate the stability of the quality of the factory. The method and the result of the model can assess the quality of the batch of the smart meter, and can be beneficial to estimate the quality of factory.
The Application of Pseudo-Random Sequence in the Properties Measurement of Polymer Optical Fiber
Authors: Wang Yan Chun , Sun Chang Wei
Published: March 2013

A new method for the properties measurement of polymer optical fiber (POF) using pseudo-random sequence is introduced. The light source modulated by pseudo-random sequence is injected into the POF. The output optical signal after photoelectric conversion is made the correlation detection with pseudo-random sequence, and finally the correlation operation is carried out based on Labview software. Because pseudo-random sequence performs well on randomicity and it has the correlation properties similar to that of white noise, interference and noise have little influence on the peak of correlation function during the measurement, and the signal-to-noise ratio (SNR) of the output signal can be improved obviously. The measuring method is studied both theoretically and experimentally. Experimental results show that the SNR of the output signal can be improved by 25~40dB for the signal with SNR-15dB to 6dB, and the measuring precision is improved by this method.
Design and Simulation of Pressure Sensor for Ocean Depth Measurements
Authors: Suja K.J. , Chaudhary Bhanu Pratap , Komaragiri Rama
Published: March 2013

MEMS (Micro Electro Mechanical System) are usually defined as highly miniaturized devices combining both electrical and mechanical components that are fabricated using integrated circuit batch processing techniques. Pressure sensors are usually manufactured using square or circular diaphragms of constant thickness in the order of few microns. In this work, a comparison between circular diaphragm and square diaphragm indicates that square diaphragm has better perspectives. A new method for designing diaphragm of the Piezoresistive pressure sensor for linearity over a wide pressure range (approximately double) is designed, simulated and compared with existing single diaphragm design with respect to diaphragm deflection and sensor output voltage.
Ways and Means of Improving the Quality of Drill Pipe Connections
Authors: He Hui Lan , Na Shun Sang , Tian Bo , Wang Jiu Quan , Cao Xing Lomg , An Dong Yuan
Published: March 2013

Continuous development of science and technology, the human ability to conquer nature and continuously improve, but also rapid growth in social demands, significantly reduced the amount of available resources. Earth-shallow layer drying up of resources of our human life, forcing people to the underground exploration of the deeper substance to meet human needs. This requires adaptation of deep drilling tool for drilling needs good equipment, deep-hole wireline coring drilling equipment in adapting to constantly update and be perfect with this demand.
Novel Emitter-Segmented Power HBT with 2-D Non-Uniform Segment Spacing for High Thermal Stability
Authors: Jin D.Y. , Hu R.X. , Zhang W.R. , Lu D. , Fu Q. , Zhang Y.J.
Published: March 2013

With the aid of the thermal model, thermal resistance matrix of emitter-segmented power HBT is proposed to represent thermal effects. The effect of 2-dimensional (2-D) inter-segment spacing on thermal stability of device is studied. It is shown that the increase of inter-segment spacing could effectively decrease thermal coupling resistance, lower temperature of center segments, and hence improves the thermal stability. Furthermore, a novel emitter-segmented power HBT with 2-D non-uniform segment spacing is proposed, in which the non-uniformity of segment temperature is improved by 75.26% and the maximum power level difference of emitter segment is improved by 55.84%, when compared with uniform segment spacing HBT. Therefore the technique of 2-D non-uniform segment spacing is a better method for enhancing the thermal stability of power HBTs.
The Calculation of the Reproducibility Error in the Technological System with the Clamp on the Gas Power
Authors: Shen Xing Dong
Published: March 2013

By using the classic control theory, the paper deduced a calculation formula on the Reproducibility Error of parts processing in the technology system, the flexible clamp system , with the clamping device on the gas power, and analyzed its influencing factor with examples.
Application of the Rainbow Schlieren Method in Free Underexpanded Jets
Authors: Wu Wen Tang , Hong Yan Ji , Ye Ji Fei , Jiang Guan Lei
Published: March 2013

An experimental investigation into free underexpanded jets is described. In this paper the experiment took the axis-symmetry unexpended jets as the object, used the typical "Z" schlieren system and replaced the edge with rainbow filter.The rainbow schlieren method is used to obtain measurements in underexpanded jets with nozzle pressure ratios ranging from 2.97 to 19.80. Obtaining the result of that the influence of pressure ratio on jet structure. This paper provides an operation method in the concrete and some useful reference for the rainbow schlieren technique.
Finite Element Analysis on Thermal Characteristic of a High Precision Turning Center’s Headstock
Authors: Zhang Yao Man , Gu Ren Jun , Han Jia Liang
Published: March 2013

Theperformances of the turning center will be influenced by its thermalcharacteristics seriously, and accurately predict thermal characteristic of themachine tool is helpful to improve the design level. The headstock of a high precision turning center has been regarded as the researchobjects, and its thermal properties and influence on the performance of the turningcenter are studied. First based the finite element analysis model that has beenconstructed, the steady temperature field distribution and thermal equilibriumtime of the headstock are calculated, and then the temperature field andthermal deformation have been calculated also, and analysis to identify thetrend of the headstock heat distortion are also been done. Some of the keyfactors on the thermal performance of turning center are also studied. Thestudy lays a foundation for the thermal error compensation of the headstock.
Measure and Analyze the Problems of Concrete Mixture Production via Six Sigma DMAIC Tools: Central Concrete Mix Plant as a Case Study
Authors: Karakhan Ali A. , Alsaffar Angham E.
Published: March 2013

The aims of this study are to measure the defect rate and analyze the problems of production of ready concrete mixture plant by using Six Sigma methodology which is a business strategy for operations improvement depending basically on the application of its sub-methodology DMAIC improvement cycle and the basic statistical tools where the process sigma level of concrete production in the case study was 2.41 σ.
Electrical Discharge Dressing Metal-Bonded Diamond Grinding Wheels with Misted Emulsion
Authors: Cai Lan Rong , Ruan Wen Yu , Li Min
Published: March 2013

Preparation of superabrasive grinding wheels presents severe challenges due to the high hardness of abrasive grain. In this paper, electrical discharge dressing (EDD) technology with misted emulsion is applied to dressing bronze-bonded diamond wheels. Dressing experiments were carried out. The wheel profiles before and after dressing were measured using a Dektak 6M profilometer. The diamond wheel surface topographies before and after dressing were observed by three-dimension digital microscope. In addition, the performance of EDD’ed wheel was evaluated in practical grinding. It is shown that favorable surface topography can be obtained under suitable processing parameters and EDD misted emulsion with is feasible for metal-bonded diamond grinding wheel.
Analysis of Dynamic Characteristics of 1.5 MW Wind Turbine Tower
Authors: Pan Ping Ping , Chen Chang Zheng , Yu Shen Bo , Meng Qiang
Published: March 2013

The wind turbine tower is to bear wind load and work load which is brought by the rotating blades during operation. Therefore, analysis of dynamic characteristics of wind turbine tower is a complicated task in the wind turbine reliability design. The dynamic characteristic of wind turbine tower plays an important role in its vibration control. This paper presents fluid-structure coupled dynamics equations accounting for the blade wheel load and wind load applying on the tower. By the model analysis, a feasible method for evaluating the dynamic characteristics of wind turbine tower under the wind turbine wind load and the rotating blade random load is obtained. The model is verified in the 1.5MW wind turbine.
Prototype Design of Rectifier Transformer for High Power Density
Authors: Ding Xiao Dong , Wang Yan An
Published: March 2013

The traditional high-voltage high-frequency transformer has a drawback of low power density due to the rigorous requirements of high voltage insulation. This paper proposes a new configuration for the magnetic core based on planar EE cores. The parallel connection of planar cores was adopted as a unit, and several units were cascaded to form the high-voltage transformer. The electrical potential distribution of the proposed transformer is more uniform than a traditional transformer, and enables a decrease in the insulation distances. The mechanical configuration of a laboratory prototype is discussed, as well as the electrical, parasitic, and thermal behaviors.
Thermal Heating Effect on Structural and Mechanical Property of Diamond-Like Carbon Film Prepared by Filtered Cathodic Arc
Authors: Khamnaulthong Nattaporn , Siangchaew Krisda , Limsuwan Pichet
Published: March 2013

Diamond-like carbon (DLC) films were deposited on magnetic recording head by Filtered Cathodic Arc (FCA) technique and a-Si base material was ion beam deposited as seed layer. To investigate the thermal stability of stack film, repeated cycle thermal heating at 200 °C was employed. Raman spectroscopy and nanoindenter (Hysitron) were performed to understand film structure and mechanical property as a function of thermal heating conditions. The roles of heating in material composition and wear behavior of DLC films are discussed. The Raman spectra revealed that G position, FWHM of G peak and Id/Ig change as with increasing heating cycle which agreed well with wear depth measured. With these results suggesting DLC film degraded with repeated heating at 200 °C.
Newton-Homotopy Algorithm of Ill-Conditioned Load-Flow
Authors: Gu Gen Dai , Liu Yuan
Published: March 2013

The ill-condition of the load-flow is caused by a variety of reasons. Among them, heavy load and a long line of radiation type slip(large r/x) are the two important reasons. In connection with the ill-conditon above, Newton-homotopy algorithm is introduced in this paper. The algorithm mixes the locally quadratic convergence of Newton-raphison with wide range convergence of homopoty algorithm, so it improves the ill-condition of Jacobian matrix in the process of load-flow calculating, and speeds the convergence. Finally, several examples show the efficiency of the algorithm.
DC Bus Instability Driving by Photovoltaic Source with Constant Power Load
Authors: Nasir M.N.M. , Jusoh Awang , Khamis Alias
Published: March 2013

This study presented the DC bus instability in distributed power system driving by Photovoltaic (PV) source with constant power load (CPL). The aim of this study is to investigate the effect of PV source towards the performances of DC bus voltage stability using constant power load. The system first was tested using linear DC supply as voltage source and CPL was modeled and connected to the voltage source through LC filter network. A passive damping circuit was chosen to stabilize the DC bus instability. The system was repeated using PV source. PV array was modeled based on the parameters obtained from a commercial PV data sheet. A circuitry simulation was performed under the similar design excluding the DC source in order to investigate DC bus instability. Results showed that the stability of DC bus become unstable when using linear DC voltage supply and slightly affected when using PV source. The instability phenomenon due to the negative incremental impedance of a constant power load can be overcome by using damping technique. For linear DC voltage source, DC bus voltage system tends to oscillate. However, with PV source which is actually a current source input seems not much affecting the DC bus voltage stability.
Cascading of Diode Clamped Multilevel Inverter Boosters for High Voltage Applications
Authors: Rashmi M.R. , Anu B.
Published: March 2013

Nonconventional energy sources are playing important role in meeting current power/energy demands. However these sources cannot provide High voltage/power. For power conditioning and voltage amplification solid state power converters are very much essential. One such approach to obtain high voltage was to use cascaded multilevel inverter but cascaded multilevel inverters require separate DC sources and they cannot be used for regenerative applications. To overcome these limitations, a novel configuration is using diode clamped multilevel inverter is proposed here. . The conditioned DC voltage from photovoltaic cells or fuel cells or batteries is boosted and inverted by means of multistage Multilevel Inverters (MLI). Three different configurations are presented in this paper. From the simulation results of all three configurations, the topology which is found to be better is implemented in the real time. A proto type is developed to boost 40 V input DC to 100 V AC and the experimental results for the same are presented.
Comparison of Monitor Types in Personal Computer Set on Electrical Energy Saving and Side Effect on Power Quality
Authors: Uyaisom C. , Nuntasud K. , Kerdlap P.
Published: March 2013

This paper presets comparisons of type of monitor in personal computer set on electrical energy saving and side effect on power quality. The 3 types of monitor in personal computer consists of cathode ray tube : CRT type inch, liquid crystal display : LCD type, and light emitting diode : LED type and side of each monitor is 19 inch. The experimental results as shown the power consumption and side effect on power quality such as power factor and %THDi each monitor types. The experiment results shown the best effectiveness is LED monitor type, it can be saving of energy up to 75.69 % of CRT monitor type and 45.30 % of PC. Set with CRT monitor type. However, the LED monitor type are generated of %THDi very high level and low level of power factor.
Optimal Location of UPFC with ATC Calculation
Authors: bin Salim Norhafiz
Published: March 2013

Flexible AC Transmission System (FACTS) devices namely Unified Power Flow Controller (UPFC) will gives a basic control for transmission line real/reactive power flow and bus voltage/shunt reactive power. UPFC helps in regulating the power and mitigating the rotor speed instability and damping oscillations. UPFC placement was conducted at each line in the entire network system to obtain the most suitable optimum location for most effectiveness performance. The performance of the optimal UPFC location is checked by applying a fault across a transmission line to which UPFC is connected and the power flow in the line and stability of the system is determined. Available Transfer Capability values indicate allowable highest magnitude of active power (MW) that can be transferred from the source to the sink over and above the already committed uses (base case) of the whole network without exceeding any line thermal loading and bus voltage limits. Finally, simulations were carried out using PSAT software to validate the performance of the UPFC which connected to a transmission line. The effectiveness for UPFC is demonstrated on IEEE 9 bus and IEEE 24 bus system while for ATC is demonstrated on IEEE 6 bus system and all the results are compared.
Cooperative Object Transportation Using Connected Robots
Authors: Eoh Gyu Ho , Oh Jeong H. , Lee Seung Hwan , Lee Beom H.
Published: March 2013

This paper presents cooperative object transportation using connected robots. Previous studies of object transportation mainly used pushing or grasping methods to manipulate objects. A pushing method, however, cannot control the object motion precisely and a grasping method requires complicated gripping action before the transportation. Therefore, we suggest a new object transportation method which uses a rope. The method consists of three phases according to the behavior: the approaching, enclosing and transportation phases. Robots and an object have different formation controllers in accordance with their phases. Real experiments are presented to prove the validity of the proposed method.
Collision-Free Multi-Robot Navigation Using Autonomous Object Selection
Authors: Lee Kong Woo , Jeon Jae D. , Kim Doo Jin , Lee Beom Hee
Published: March 2013

For successful SLAM, landmarks for pose estimation should be continuously observed. Firstly, we proposed the object selection algorithm from 2D images and 3D depth maps without human’s supervision. We used the SIFT algorithm to obtain descriptors of point features inside the object, and the surface segmentation algorithm to obtain separated objects from point clouds of 3D depth maps. Automatically selected objects were tested by the threshold function using repeatability, distinctiveness and saliency whether the objects were suitable or not for reusing and sharing between the robots. Secondly, we suggested the closed-form solution to estimate the 3D pose of robots from the information of selected objects. Furthermore, we provided the effective way to accomplish the tasks using multi-robot by compensating the accumulated navigating errors and re-planning the collision-free motion of the robots using the extended collision map algorithm.
The Closed Method of Solving in Inverse Solution of Position in Delta Parallel Mechanism
Authors: Kang Cun Feng , Feng Dan
Published: March 2013

Delta mechanism with the smooth and flexible movement,reliable structure, is a kind of parallel mechanism.Through inversely solving the Delta mechanism space position is to set up a kind of equivalent relationship and through analysis of the mechanism is to solve the rotating angle of the hinge that is between connecting rods that are equivalents of three parallelograms,and the base platform.Through inverse solution of kinematics before building the whole mechanism,the range of the center in mobile platform can be found intuitively from graphics when it is satisfied with the restriction condition.According to requirements, the optimization of mechanical structure can be achieved.
A Toy Robot via Cam Design as a Balance Module of Gravity Shifting
Authors: Pa P.S. , Jou J.B.
Published: March 2013

This study presents a brand new concept in contrast to that of the conventional mechanical toy robots on the market. Conventional toy robots rely mainly on a large sole area to reduce wobble during walking. In this study walking stability is realized not by large sole areas but by a cam designed to automatically shift the center of gravity during walking. The biped toy robot proposed is driven by a single motor. As soon as the robot takes a forwards step, the center of gravity is changed by the cam module, and under the action of gravity, the trunk moves automatically to shift the center of gravity. Both walking and shifting the center of gravity is done by one motor. It was a goal of this study to develop a new type of walking toy robot by modifying traditional toy design. Experiment and simulation revealed that the rotation speed of the crank influences the walking of the biped toy robot, and the crank length influences both the length and height of the stride. In addition, counterbalance of the robot while walking is affected by the location of the center of gravity of the trunk and the distance between the feet. It became clear that the stability of the walking robot was determined by many factors, and difficulties may arise if any of these factors is changed.
Nonlinear Mathematical Modelling of Servo Pneumatic Positioning System
Authors: Saravanakumar D. , Mohan B.
Published: March 2013

Servo pneumatics is a mechatronic approach that enables accurate control of pneumatic drives which are widely used in automated systems. This technology can provide an alternative for less efficient electromechanical and high cost hydraulic systems. The main problem in the servo pneumatics is the fact that the variables associated with the system such as frictional forces, mass flow rate and pressure in the chambers, varies in nonlinear fashion. The paper presents nonlinear mathematical model for motion of cylinder, pressure in the cylinder chambers and mass flow rate from valve to cylinder are derived from basic gas laws and dynamics of the system. The equation for friction force based on LuGre model is also presented in the paper. Further, a nonlinear state space representation for the servo pneumatic positioning system is obtained. The developed model can be used to simulate the system response, which will help in choice of components used and also in the development of precise controller for the system.
The Development of Simulation Tools for Design of Waveguide Filter Using Resonant Iris Circuit
Authors: Choocadee Sarun , Tantiviwat Sugchai , Akatimagool Somsak
Published: March 2013

This paper presents a development of Electromagnetic simulation tool for design of rectangular waveguide filter using inductive-capacitive resonant iris circuit. The simulation is designed and developed by using the electromagnetic wave propagation and iterative method to calculate the amplitude of waves in the frequency and spatial domain. The developed EM simulation, called WCD (Waveguide Circuit Design) consists of menu, designed, calculating and displayed windows which were designed by using GUI (Graphic User Interface) of MATLAB® software. In this paper, the resonant iris circuit in the waveguide are simulated and compared to the CST Microwave Studio®. The simulated results present correctly the circuit properties and electric and current distribution on the waveguide iris circuit. The results agree with theory, CST simulation.
Modeling and System Identification using Extended Kalman Filter for a Quadrotor System
Authors: Abas Norafizah , Legowo Ari , Ibrahim Zulkiflie , Rahim Norhidayah , Kassim Anuar M.
Published: March 2013

Quadrotor has emerged as a popular testbed for Unmanned Aerial Vehicle (UAV) research due to its simplicity in construction and maintenance, and its vertical take-off, landing and hovering capabilities. It is a flying rotorcraft that has four lift-generating propellers; two of the propellers rotate clockwise and the other two rotate counter-clockwise. This paper presents modeling and system identification for auto-stabilization of a quadrotor system through the implementation of Extended Kalman Filter (EKF). EKF has known to be typical estimation technique used to estimate the state vectors and parameters of nonlinear dynamical systems. In this paper, two main processes are highlighted; dynamic modeling of the quadrotor and the implementation of EKF algorithms. The aim is to obtain a more accurate dynamic modelby identify and estimate the needed parameters for thequadrotor. The obtained results demonstrate the performances of EKF based on the flight test applied to the quadrotor system.
Parametric Modeling Technology for Transmission Line Towers
Authors: Meng Sui Min , Kang Wei Hua , Jiang Peng , Liu Wen Jing , Guo Hao
Published: March 2013

Transmission towers have characteristics of similarities and succession; therefore parametric modeling ideas can be used in simulation study on the tower. Using CSG method, characteristics parameters extraction and the 2Z2E3 double-loop linear tower, the paper suggests parametric modeling analyzing the 2Z2E3 double-loop linear tower. Finally, its verified that the feasibility of parametric modeling through the modal analysis comparison between parametric model and GUI model in ANSYS.
Stability Analysis on a Crack Rotor System in the Special Speeds
Authors: Wang Feng Lan
Published: March 2013

In this paper, the single disk rotor system with a transverse open and close crack has been taken as an example; the stability problem on the system in the special speeds has been discussed by theoretical analysis and experimental study. First, the conditions, positions and areas of the stable vibrations and the unstable vibrations on a rotor system with a transverse crack have been studied quantitatively theoretically. Not only the conclusions of other authors are verified，but also that the unstable vibrations are found in the regions near the rotational speed at 2/5and 2/7 of the critical speed in the large crack and the small damping case. Then the influence of some factors such as the crack depth parameters and the damping on stability of the system is qualitatively discussed.
Deformation Analysis on Deep Buried Tunnel of Weak Rock Mass Material with Material Properties under TBM Construction
Authors: Wen Sen , Kong Qing Mei
Published: March 2013

Deep buried tunnel of weak rock masses material is prone to generate large deformation; it’s easily trapped when TBM is used, so it’s important to predict the deformation in weak rock mass material. The method of orthogonal experimental design is adopted to design numerical experiment；Accordingly to the designed experiment, . FLAC3D is used to calculate and lots of data of deformation is derived. Percentage strain keeps the same when the diameter varies. Thorough analysis is carried out on derived data. The formulas of maximal strain in shied area, strain in tunnel face and supported area is regressed. The predictive value and test value have obvious linear relationship and it demonstrates that regressed formulas are credible.
Stress Analysis of Six-Point Glass Panel for Point Supported Glass Curtain Wall under Wind Load
Authors: Yan Yu Qin , Dong Mei Ling , Diao Xun Lin , Zhao Liang , Xu Bo Cheng
Published: March 2013

Short period fluctuating wind speed is simulated by using Auto-Regressive and it is proved that the calculation methods are reasonable. The variation of stresses on the middle supporting point of six-point glass panel is analyzed and it is shown that the application of elastic support on the middle supporting point can significantly relieve the stress. The method to find out the best elastic floating quantity is also determined.
Research on Method of Equivalent Heat Transfer Straight Pipe with Material Properties in the Cement Clinker Unit Body
Authors: Wen Yan , Yue Hai Long , Liu Bin
Published: March 2013

In order to accurately master the material heat transfer properties of the cement clinker，the theory of fluid flowing and heat transfer in straight pipe was applied to the cement clinker accumulation body porous medium in this paper. The equivalent relation of the relatively mature theory of fluid flowing and heat transfer in straight pipe and that in porous medium was established by building the peer-to-peer relationship of the important parameters in the straight pipe and the cement clinker accumulation body. This paper obtained a simple evaluation method of the material heat transfer properties of cement clinker which has more engineering application value.
Selection Analysis of Building Envelope with Building Materials in Summer Hot and Winter Cold Area — A Case Study in Xi’an Wall Insulation System
Authors: Dong Xiao Lin , Han Dong Nan
Published: March 2013

The model of residential buildings is established in allusion to the type of residential building wall exterior insulation system and the characteristics of the various features of the wall enclosure in summer hot and winter cold region. The energy consumption of different types of wall structure is simulated and calculated using energy simulation software DeST-h, the economic characters of the structure of energy consumption of different types were compared and analyzed comprehensively, the conservation and efficiency were quantitative analyzed, the principias for selecting the structure of residential buildings of wre provide based on the principle of maximizing energy efficiency.
Research on the Transference of Cd with Properties of Environmental Materials and Activated Reagent in Underground
Authors: Hu Hong Tao
Published: March 2013

The natural transfusion and activated reagent (environmental material) enhanced migration efficiency was studied by the experiments in Cd contaminated groundwater in this work. The experimental results showed that the variation rule of Cd reflected that its migration was weak and the removal efficiency was only 11.36% near the anode zone in the natural seepage condition, but under the enhanced migration function, the pollutants could be enriched and removed faster. The main migrating direction of pollutant was mainly from upstream anode zone to downstream cathode zone, which indicated that the washing function could enhance the migrating efficiency of pollutants. And the Cd of in anode zone decreased relatively quickly and its removal rate was 25.75 %, which made known that this enhanced migration of Cd in contaminated groundwater was more effective method than that of natural seepage migration.
Special Equipments with Special Materials by Nondestructive Testing Technology
Authors: Wen Li Juan , Zhang Hong Bo , Xie Fei
Published: March 2013

Special equipments with special materials are very important equipments with potentialdanger, which are widely used. Nondestructive testing(NDT) plays one of the most important roles in insuring manufacture quality and operation safety of special equipments. The NDT techniques used for testing of special equipments are reviewed, such as radiographic testing, ultrasonic testing, magnetic particle testing, dyepenetrant testing, eddycurrent testing.
Effects of Mg2SiO4 Addition on the Microstructure and Dielectric Properties of MgTiO3-CaTiO3 Ceramics
Authors: Shi Fei , Du Peng Cheng , Liu Jing Xiao , Wu Ji Wei , Chen De Qing , Dong Xiao Li , Ma Hong Chao
Published: March 2013

The Mg2SiO4-MgTiO3-CaTiO3 composite dielectric ceramics with different Mg2SiO4 addition amounts were prepared by solid state reaction method. The effects of Mg2SiO4 addition amounts on the microstructure and dielectric properties as well as sintering temperature of xMg2SiO4-(0.95-x)MgTiO3-0.05CaTiO3 (abbreviated as xMSTC, 0.25≦x≦0.75) composite ceramics were investigated. The results indicated that the sintering temperature of MgTiO3-CaTiO3 based ceramics with Mg2SiO4 addition could be lowered effectively to 1320~1340°C, and the dielectric constant decreased and dielectric loss increased gradually with the increase of Mg2SiO4 content. The 0.45MSTC ceramics containing 45 wt% Mg2SiO4 and sintered at 1340°C showed desirable dielectric properties with dielectric constant εr=13.3，dielectric loss tanδ=4.5×10-4 and temperature coefficient of relative permittivity τε =10 ppm/°C.
Whole Search Method of Space Sub-Domain of Sheet Metal Stamping
Authors: Jiang Xiao Ming , Hu Chun Lai , Liu Wang Sheng
Published: March 2013

In the machining industry, sheet metal stamping is an important method of metal forming, and stamping die forming quality depends on the structure and process design, the use of finite element technology(FEM), computer simulation of sheet metal forming process, forming the law and indicates that there defects in order to achieve the most optimal design. This article describes the increased exposure to whole search to determine the finite element calculation speed and accuracy of a new method— space sub-domain method.
Determination of Organochlorine Pesticides by Headspace Liquid Phase Microextraction Using Ionic Liquid Material
Authors: Huang Du Shu , Yi Ping , Long Yun Hui , Jiang Yan , Pan Qing Shan , Wu Jie
Published: March 2013

Headspace liquid-phase microextraction with room temperature ionic liquid material, 1-butyl-3-methylimidazolium hexafluorophosphate ([C4MIM][PF6]) as extractant for the determination of organochlorine pesticides including 2,4 '-DDT and 4,4'-DDT from water were investigated in this study. The factors such as salt content, sample pH, operation temperature, stirring rate, extraction time, microdrop volume, and sample volume were found to have significant influence on this process. Results show that the satisfactory extraction conditions were as follows: 30% NaCl (w/v), 800 rpm, 30 min, 60 °C, and 10μL ionic liquid.
Research of Surfactants Effect on Methane Hydrate Formation with Properties of Biochemical Materials
Authors: Dou Bin , Gao Hui , Ren Lei
Published: March 2013

This paper deals with the effects of a surfactant additive on the formation of methane hydrate in water system with and without sodium dodecyl sulfate (SDS). The properties of sodium dodecyl sulfate are listed. The results manifested that the presence of SDS could not only accelerate the hydrate formation process, but also increase the partition coefficient of methane between hydrate and vapor drastically. The paper then describes our experimental observations of the hydrate formation from methane, to show how the hydrate formation behaviors are affected by the additives of chamber partially filled with a quiescent pool of water (pure water or an aqueous SDS solution) to compensate for the gas consumption due to the hydrate formation, thereby maintaining a constant pressure inside the chamber. The results revealed that the addition of SDS not only on the liquid-pool surface but also on the chamber walls above the level of the pool surface, leaving the bulk of the liquid pool free from hydrate crystals. An excessive addition of SDS beyond the solubility was found to cause a decrease in the rate of hydrate formation but an increase in the final level of the water-to-hydrate conversion.
The Robust Control Research for Non-Linear Inverted Pendulum System in Mechanical Industry
Authors: Li Hong Xing , Zhang Yong Xin
Published: March 2013

Inverted pendulum system is a non-linear，natural instability and uncertain system. As a controlled objects of control system in mechanical industry, it can be analysis and verification by different control theory and methods. The paper analysis the non-linear inverted pendulum system, then deduces sufficiency conditions of the existence of controller with state feedback. It utilizes standard digital software to get the answer. The feasibility and robustness is demonstrated by numerical examples.
Lubricant Research on SGMF of Magnesium Alloy Sheet
Authors: Cao Miao Yan , Zhao Chang Cai , Wu Li Jun , Dong Guo Jiang
Published: March 2013

The non-isothermal drawing test in SGMF of the ordinary commercial AZ31B sheet metal was conducted to research the influence of lubricating condition on the drawing performance. And the experimental results have demonstrated that the lubricating condition has a great effect on the sheet drawability, furthermore, the work-piece with LDR of 2.4 was successfully produced when the water-based molybdenum disulfide with appropriate proportion was employed as lubricant, wherein the conditions were set as temperatures of the sheet metal and the granule medium respectively 290~310°C and 150~190°C, the blank holder gap 1.3mm and the drawing speed 1mm/s.
Ferulic Acid-Loaded Shellac Microparticles Prepared Using Electrohydrodynamic Atomization
Authors: Yu Deng Guang , Qian Wei , Wang Xia , Li Ying , Lu Wei Jun , Zhang Yong
Published: March 2013

An Electrohydrodynamic atomization (EHDA) process was exploited to prepare ferulic acid (FA)-loaded shellac microparticles. SEM observations showed that all the particles were round and solid with their sizes gradually increased from 0.68 ± 0.21 to 2.75 ± 0.64 μm as the concentrations of shellac and FA in ethanol raised from 20% to 50% (w/v). Wide-angle X-ray diffraction analyses demonstrated that FA had been totally converted into an amorphous state in the shellac matrix microparticles. Attenuated total reflectance Fourier transform infrared analysis disclosed that the hydrogen bonding presented between FA and shellac molecules. In vitro dissolution tests verified that all the microparticles were able to provide a fine sustained drug release profile. The release time periods had a close relationship with the diameters of microparticles. All the microparticles released the loaded FA via a typical Fickian diffusion mechanism. The present study provides an easy way to develop novel drug delivery microparticles for providing sustained drug release profiles.
Study in MAF of AISI304 Material Using Grey Relational Analysis
Authors: Chow Han Ming , Ku Wei Liang , Lin Ching Tien , Lin Yan Cherng , Yang Lieh Dai
Published: March 2013

The purpose of this study was using a new approach of grey relational analysis based on Taguchi experimental design to employ the magnetic abrasive finishing (MAF) method to process the stainless AISI304 material on surface abrasive operations. The operations were demonstrated in the permanent magnetic polishing mechanism, it was installed in the CNC machining center. The operations of the parameters such as magnetic field, pole revolution, feed rate, working gap, abrasive, and lubricant, were considered. The confirmation experiments showed the optimal operational condition of surface roughness. The collected data were analyzed using a new approach of grey relational analysis to establish of abrasive magnetic finishing parameter and quality characteristic. The optimal parameter condition to process the stainless AISI304 material was conducted using two stage processes; prior to the rough polishing, the Rmax value was equal to 2.572 μm, Rmax value was 0.10 μm after the finished polishing. It could be concluded that magnetic abrasive finishing was one of the excellent technologies of getting good surface roughness with high efficiency.
Effect of MgSO4, NaHCO3, KH2PO4, K2HPO4 and Ascorbic Acid on Survival of Bifidobacterium bifidum during Freeze-Drying
Authors: Qin Tao , Ma Qi , Chen He , Shu Guo Wei
Published: March 2013

Effect of MgSO4, NaHCO3, KH2PO4, K2HPO4 and ascorbic acid on the survival of Bifidobacterium bifidum and the number of viable cells of lyophilized powder was studied. Results were as follows: addition of MgSO4, NaHCO3, KH2PO4, K2HPO4 and ascorbic acid into B. bifidum paste could significantly improve the survival rate of B. bifidum and the number of viable cells of lyophilized powder. The optimal concentrations of MgSO4, NaHCO3, KH2PO4 , K2HPO4 and ascorbic acid were 0.20%, 0.60%, 1.80%, 1.40% and 2.20, the survival of B. bifidum was 78.31%, 77.92%, 77.80% ,79.82% and 71.62, respectively.
Study on Environmental Materials with Wastewater on Yielding Water Quality and Starch Quality Based on Influence of Recycling Ratio of Sweet Potato Starch Production
Authors: Tian Xia , Shi Yan Xi , Lin Guo Lin
Published: March 2013

In order to improve sweet potato starch production technique of small-scale plant and decrease the discharge of pollutant in production wastewater, the yielding water of starch production was treated efficiently by the new environment materials and technology. Subsequently, the treated wastewater was circulated and reused in starch producing process. The results showed that the quantity of starch wastewater was decreased. When the recycle ratio is below 30%, the starch quality was hardly influenced. When the recycle ratio is above 50%, the pollutants in wastewater increased significantly, starch yield dropped nearly to 50% and starch acidity exceeded the national standard. Finally, wastewater reuse ratio should be controlled below 30%.
A Reseach of Fracture Mechanism in Micro Cutting of 45 Steel Based on Material Properties
Authors: Ding Hong Jun , Wang Xi Bin
Published: March 2013

Abstract: Though the observation in micro cutting of 45 steel, the deformation zone of fracture characteristics was studied, and the corresponding cutting model was established; on dynamic tensile and situ observation of 45 steel by transmission electron microscopy , micro cutting ductile fracture process is simulated by the experiment on the steel tensile of 45 film sample, and the mechanism on initiation and propagation of crack in micro cutting fracture was studied with dislocation theory.
Simulation and Optimization of Energy Saving Distillation Process for High-Purity Trichlorosilane with Material Properties
Authors: Zhang Yuan Di , Xie Gang , Hou Yan Qing
Published: March 2013

In order to reduce the production cost of polysilicon, the raw material of the photovoltaic industry, applying heat integrated distillation technology of two towers in trichlorosilane distillation process consisting of removal of light components after removing heavy components. By assistant of a chemical process software, the new energy-saving process is simulated, the main parameters of two towers are optimized and the best implementation solution are provided. The optimum parameters for the first tower are the operation pressure of 500 kPa, the number of theoretical plates of 32, the position of feed plate of 24, reflux ratio of 4.2 and the distillate to feed ratio of 0.8516. For the second tower, the operation pressure, the number of theoretical plates, the position of feed plate, the reflux ratio and the bottoms to feed ratio are 250 kPa, 74, 15, 111 and 0.9652 respectively.The results showed that the new process can save energy consumption up to 50%, the coefficient of recovery for trichlorosilane is up to 98.7% while the high purity of trichlorosilane can ensure the resulted polysilicon excellent photovoltaic properties.
Image Denoising in Industry Based on Multiwavelet Riesz Bases
Authors: Song Qi Chao , Liu Zhi Song , Wang Chao Ping
Published: March 2013

Damage testing of components is a key point in many industry fields. In some cases, endoscope is used to inspect the damage part, while the images are often noised. In this paper, we focus on industrial image denoising based on multiwavelet Riesz bases. Starting from compactly supported vector refinement equation, we provide a characterization to form two Riesz bases and an example is given. Based on example Riesz bases, we research industrial endoscope image denoising and get satisfying result.
Research on Mechanical Industry with the Patrol Robot Study Based on the Embedded System
Authors: Li Wei
Published: March 2013

It is a hot topic that comprehensive machine vision and embedded systems for mechanical industry robot motion control now. In this paper, an embedded robot visual servo tracking system platform was build, which can process and analyze video images and audio data, then analysis results was transfered to the drive motor in the robot body, and realized the autonomy tracing of the mechanical robot .