bluuebunny/crossref_metadata_2025 huggingface dataset:
Design and Simulation of Piston Buffering Device for Impact Hammer
Authors: Zhang De Sheng , Tong You , Wang Guo Fa , Ren Huai Wei , Zhao Guo Rui
Published: June 2013

Aiming at the mispunch problem of emulsion impact hammer, the cone-type piston buffering structure was adopted to minimize the impact. Impact process simulation model of differential connection piston was built using AMESim software, the influences of different buffer length, conical angles and buffer clearance on the terminal velocity and pressure were analyzed according to the model and optimum parameters (half cone angle 5°, length 50mm as well as clearance 0.25mm) were determined. The collision progress between piston and the guide sleeve at 2m/s simulated by LS-DYNA software shows that the maximum stress is 674MPa which locates at at the edge of the liquid inlet hole of guide sleeve, and the maximum stress on interface is less than 400MPa, both of them area lower than the yield strength of materials,so the guide sleeve is of shock resistance. However, it is found to have rebounding phenomenon during the buffering process and the mispunch should be attentively prevented.
Axial Compression and Energy Absorption Characteristics of Reduction Tubes Using a Die under Impact Load
Authors: Mao He , He Kai , Luo Chang Jie , Du Ruxu
Published: June 2013

Reduction tube using a die is a kind of deformation tubes which are used on railway train as energy absorbers. In this paper, axial compression behavior and energy absorption characteristics of reduction tubes using a die under impact load are investigated. No-linear finite element software LS-DYNA is used to conduct the numerical study. Results for the expansion tube using a die (another kind of deformation tube) and the reduction tube using a die are compared. Assuming two different structures with the same material and sectional area, an analysis shows that the energy absorption of reduction tube is better than the expansion tube. Hence, the reduction tubes using a die are investigated using a series of numerical analysis. The relationship between displacement and load, average load are obtained. The influences of impact mass and impact velocity are discussed.
Interval Perturbation Method to Structural Non-Probabilistic Reliability Analysis
Authors: Sun Zuo Zhen , Meng Guang Wei , Li Feng , Zhou Li Ming
Published: June 2013

In structural non-probabilistic reliability analysis, the uncertain structural parameters are assumed to be the interval parameters. The commonly used probability model will lose accuracy when there is not enough experimental date for the reliability analysis. Conversely, the interval model only requires the upper and lower bound of the uncertain variable, which is more reasonable compared with the probabilistic model. The interval perturbation method is applied in this paper to compute the non-probabilistic reliability index, where the interval expansion problem has been effectively controlled. The precision of computing the reliability index is effectively improved, solving the problem of the non-probabilistic reliability index in a new way. The numerical results prove that this method is effective and feasible.
Research on the Key Technology in Ultra-Precision Machining of Optical Micro V-Groove Mold Roller
Authors: Zhao Zhong Li , Yu Hai Peng , Wu Da Ming , Liu Ying , Zheng Xiu Ting , Zhuang Jian , Jing Peng Sheng
Published: June 2013

The optical properties of micro-structure surface mold roller in the field of optics, machinery and electronics, biomedical and defense sectors are showing an increasingly important application value and broad application prospects. There is still no more mature method to machining ultra-precision large-size optical V-groove mold roller, and the roller surface treatment technology cant meet the technical requirements of the field of optical applications. This article takes advantage of ultra-precision diamond turning to machining V-groove structure on nickel-phosphorus plating steel roller by spiral cutting method. The helix angle of the mold roller was designed 0.9", which meet the requirements of the experimental error, while using a nickel-phosphorus alloy coating can eliminate the secondary polishing process and achieve a cost-efficient ultra-precision machining. Analyzed the processed tool wear, high-temperature graphitization and micro-chipping were the main reason for tool wear.
Thermodynamic Performance Analysis of Stirling Engine with a Nodal Analysis Method
Authors: Song Bo Yi , Luo Kai , Yang Hui Tao , Qin Kan , Li Wang
Published: June 2013

A nodal analysis method for thermodynamic analysis of Stirling engine is modified based on the check of mechanical loss and the temperature of the heater and cooler. A computational modeling for simulating the process of oscillating flow and heat transfer occurring in the P-40 four-cylinder double-acting Stirling engine has been developed, and the changing effects of different parameters such as the internal pressure, temperature, velocity, power and efficiency are obtained. Numerical simulation results show that they coincide with the testing data given by NASA. The influence of speed, working fluid and average pressure on the engine output performance is analyzed by the modified nodal analysis method. This method is a useful tool for the optimal design and operating characteristic analysis of Stirling engine.
Seed Adsorption Synthesis and Characterization of PMMA/PAN Particles with Core-Shell Structure
Authors: Chian Wei , Li Ying , Yang Hao , Wang Xia
Published: June 2013

Narrowly-distributed poly (methyl methacrylate)/polyacrylonitrile (PMMA/PAN) core-shell particles with a target use as the precursor for fabricating carbon microspheres and carbon nanotubes (CNTs) were prepared using the seed adsorption method. PMMA, acrylonitril (AN) and potassium persulfate (KPS) were used as the seed latex, the second-stage monomer (shell monomer) and the initiator, respectively. The effect of process parameters, such as monomer adsorption time, monomer/initiator stoichiometry, presence of surfactant as well as reaction temperature and stirring strength etc., on the morphology and size distribution of the PMMA/PAN composite particles was studied. The process condition under which uniform PMMA/PAN composite particles can form was then identified. Morphological observation by SEM revealed that upon the formation of the core-shell structure, smooth surface of PMMA spheres changed into rambutan-like rough structures.
Temperature Distribution of High Prandtl Number Liquid Bridge under Zero Gravity
Authors: Liang Ru Quan , Yang Shuo , Ji Jun Hong , Yan Fu Sheng , He Ji Cheng
Published: June 2013

A numerical model has been developed to investigate temperature field of high prandtl number liquid bridge under zero-gravity condition, and numerical simulations have been carried out. The Navier-Stokes equations coupled with the energy conservation equation on a staggered grid. In numerical calculations, we considered not only the free surface deformation but also the effects of ambient air. Overall numerical analysis of liquid bridge was carried out by level set method of mass conservation to capture two phase interfaces. Simultaneously, results of temperature field in liquid bridge and ambient gas-phase were given.
Order Vibration Analysis of High-Speed Spindle System
Authors: Wu Zhou Ping , Li Bei Zhi , Yang Jian Guo
Published: June 2013

Before the working speed of high-speed spindle system reaches the critical speed, violent vibration which directly affects the quality of the work piece has been already discovered. To precisely study the speed at which violent vibration happens and the modes of vibration, this paper provided an order vibration approach through studying the model analysis and order of spindle system. The nature frequencies of model analysis were verified and the order of spindle system was confirmed by speed ascend experiment. The result shows that the violent vibration is caused by the manufacturing error of outer ring race of bearing and the mode of vibration mainly located on the grinding wheel which greatly affects the accuracy of spindle system. It is useful for optimizing the structure and operation procedure of high-speed spindle system.
Investigation on Damping Characteristics of Double Chamber Hydro-Pneumatic Suspension Simulation and Experimental Research
Authors: Tan Zong Qi , Zhu Hua Ling , Zhuo Dao Feng , Ju Ji Feng
Published: June 2013

As to the optimization of double chamber hydro-pneumatic suspension,we researched the influence of excitation signal on the the damping characteristics. First of all, the double chamber hydro-pneumatic suspension nonlinear mathematical model and simulation model were set up to get the damping characteristic curves of different sources.And the influence of different factors was obtained according to the orthogonal test method. The results of the study show that the hydro-pneumatic suspension have nonlinear variable damping characteristics,the excitation signal with higher frequency and larger amplitude have superior damping effect;and the speed of the excitation signal have the biggest influence on its performance.The order of the influence of frequency (f), amplitude (A) and velocity (ν) to suspension performance is: ν>f>A.
Parametric Studies of the Vibration Control Effects of a Nonlinear Damper System under Multi-Axis Excitations
Authors: Lu Zheng
Published: June 2013

This paper studies the influence of system parameters to the vibration control effects of a nonlinear damper system under multi-axis excitations. The nonlinear damper system is composed of a particle damper and a primary structure. Based on numerical simulations, it is shown that: increasing the mass ratio can improve the dampers effectiveness, but only up to a certain level; applying particles with a high value of the coefficient of restitution can result in a broader range of acceptable response levels; a lightly-damped primary system can achieve a considerable reduction in its response with a small weight penalty; and that a cylindrically-shaped container provides a higher level of effectiveness than a rectangularly-shaped one.
Heat Treatments of W6Mo5Cr4V2Si High Speed Steel
Authors: Li Yong , Niu Li Yuan , Lin Ji Xing , Shi Zi Mu , Gao Guang Liang , Liu Yong Tian
Published: June 2013

In this study, we conducted heat treatments on W6Mo5Cr4V2Si steel using different annealing, quenching, and tempering processes. Meanwhile, the microstructure and hardness performance of this steel are analyzed. The results showed that, in the annealing temperature range of 790°C-870°C, the higher the annealing temperature was, the better the annealing effect that W6Mo5Cr4V2Si steel presented; W6Mo5Cr4V2Si steel exhibited the lowest annealing hardness of 22.6 HRC after annealing at 870°Cfor 2 h; In the condition of annealing at 830°C for 3 h, quenching at 1200 °C around, and tempering temperature range of 400 °C-700 °C, W6Mo5Cr4V2Si steel showed the highest hardness at tempering of 560 °C around, which is about 66.7 HRC. The tempering structure of this steel was mainly composed by needle or strip-typed martensite, a small amount of residual austenite, and carbide particles.
An Optimization Design Method of Gear Transmission
Authors: Yu Hai Ning
Published: June 2013

For solving the continuous and integer variable optimization problems in gear transmission, this article to establish a gear transmission optimization mathematical model, study the influence of modulus, tooth width, helix angle and tooth number on objective function by genetic algorithm, and the digit results is well.
Design and Power Supply‘s Quality Analysis of the Automatic Power Distribution System Based on SSPC
Authors: Zhang Qin Ling , Liu Lei , Jiang Xu
Published: June 2013

In complex and severe electromagnetic environment with more electric aircraft (MEA) and aircraft missions diversity, the power supply quality analysis and its corresponding circuit design is a key technology for the design of automatic power distribution system on airborne platform. By analyzing the structure and the characteristics of automatic power distribution system and its executive component – SSPC, this paper improves the power supply quality through paralleling RC circuit to MOSFET to absorb current shock and voltage fluctuation,and gives the calculating method of the RC components. By experiments with principle prototype, it is verified that the method can reduce the dynamic voltage fluctuation of the power supply system.
Tunable Low-Pass MEMS Filter Using Defected Ground Structures (DGS)
Authors: Guo Xing Long , Wang Z.L. , Huang J. , Zhang Z.J. , Yin H.H. , Zhu H.F.
Published: June 2013

In this paper, fully monolithic tunable millimeter-wave filters using defected ground structures (DGS) are proposed using the CPW-based periodic structures with novel multiple-contact MEMS switches. Millimeter-wave low-pass filters were designed, fabricated, and tested. The cascaded CPW-based periodic structures, with low-pass intrinsic filtering characteristics, are reconfigured into a self-similar single unit cell by the operation of the novel multiple-contact MEMS switches with single actuation. In the first order tuning, the 3-dB cut-off frequency changes from 8.2GHz to10.5GHz, and the second order tuning is 8.2GHz to 16.8GHz. The tested results show that the pass-band ripple is less than 1.2dB and the maximal out-of-band rejection is better than 27dB. The chip size of the low-pass filter is 2.5mm×1.2mm.
Analysis of Signal Distortion Caused by Opening Ratio Variation of Main Scale and Index Scale in Linear Encoder
Authors: Li Xuan , Yin Lei , Shi Yong Sheng , Ye Guo Yong , Yu Hao Yu , Liu Hong Zhong
Published: June 2013

Linear encoder as an important displacement measurement device has been widely used in manufacturing industry. The accuracy of linear encoder is based on the precision of its scales. In this article, the manufacturing process of the scales based on photolithography process and etching process was discussed in order to explain the opening ratio variation. A mathematical model was derived to analyze the effects of opening ratio variation on the waveform of output signal. The result shows that the waveform of the signal is cut off in comparison with the ideal waveform, and the magnitude of the output signal is changed.
Improvement Methods of Apparent Permeability of Ferromagnetic Core
Authors: Zhou Sui Hua , Chen Zhi Yi , Feng Shi Min
Published: June 2013

The performance of induction coil magnetic sensors , which usually have large dimensions and heavy weights, is mainly decided by apparent permeability of the core. But flux concentrator is a effective equipment to improve apparent permeability of the core, which will hardly increase dimensions and weights of magnetic sensors. Firstly, mathematical equations of apparent permeability are explained and influencing factors are analysed. Then influencing degrees of different parameters of the flux concentrator are simulated by Maxwell 2D/3D. The results are shown as follows. (a) The larger diameter and thickness of the flux concentrator, the better is the effect of magnetic concentration. (b) The less the gap between core and concentrator, the better is the effect of magnetic concentration. (c) The larger relative permeability of the flux concentrator, the effect of magnetic concentration is unconspicuous for the material whose relative permeabilityis larger than ten thousands.
Improved Method for State of Charge Estimation of Lithium Iron Phosphate Power Batteries
Authors: Li Ming , Jiang Yang , Zheng Jian Zhong , Peng Xiao Xiao
Published: June 2013

To resolve the problems that the initial state of charge (SOC) and the available capacity of batteries are difficult to estimate when using the Ah counting method, in this paper An improved SOC estimation method was proposed that combined with the open circuit voltage (OCV) method and Ah counting method based on the analysis and consideration of the battery available capacity variation caused by charge and discharge current, environment temperature and battery state of health (SOH). The precision of the proposed method was validated by using Federal Urban Driving Schedule (FUDS) test of a Lithium iron phosphate (LiFePO4) power battery. The SOC estimate error using the proposed method relative to a discharge test was better than the Ah counting method.
Summarize and Research on the Data Acquisition of Drilling Rig Hydraulic System
Authors: Liu Yin , Li Du Feng , Cao Guo Hong , Tian Sheng Li , Liu Cheng
Published: June 2013

A set to the system is designed for detecting the drilling rig hydraulic system. In the system, the significant indicators of drilling parameters are collected, which include hydraulic oil temperature, pressure values of some important points and number of the bubble in the hydraulic oil. All data from sensors is real time displayed.So those faults are detected in time.
Research on the High-Precision Phase Simulation of DSSS Signal
Authors: Li Shi Wen , Xu Peng
Published: June 2013

In order to meet the developing requirements of the high-precision GNSS(Global Navigation Satellite System) receiver and spread-spectrum TT&C equipment, we researched high-precision simulating technology of DSSS (Direct Sequence Spread Spectrum) signal and proposed simulating technology of carrier phase and pseudo code phase based on correction technology online. This technology avoids sacrificing implement slice to improve phase precision and can simulate relative motion between receiver and object. In this paper, high-precision generating method of digital middle frequency signal is focused on. The effectiveness of this algorithm has been corroborated by theoretical analysis, simulation and applied to some spaceflight simulator successfully.
The Improved Personnel Location Algorithm Based on RSSI
Authors: Zhou Sheng Mei , Huang Ting Lei
Published: June 2013

In the process of that based on the RSSI received signal strength indicator technique, resulting in the positioning accuracy is so low, since the simple RSSI, multipath, diffraction and non line of sight and other factors. In order to achieve higher accuracy node localization in wireless sensor, the paper is proposed based on the probability of recycling triangle centroid location algorithm in the RSSI technique,The probability of the cycle to handle triangle centroid localization algorithm. Through the Matlab simulation, compared with the traditional triangle centroid localization algorithm, the error is significantly reduced and positioning accuracy improved when the anchor point number exceeds a certain number.
A Two Dimension Signal Parameter Estimation Method Based on Super Resolution Technology
Authors: Xu Ying , Zhao Jun
Published: June 2013

The 2D spectrum estimation based on uniform linear array is studied in this paper. MUSIC method is firstly introduced into array signal processing to realize the frequency and angle joint estimation. And the modified MUSIC method is then applied for two dim array signal processing to fulfill joint parameters estimation of coherent signal sources. Simulation results show the validity of the proposed method. Keywords: Super resolution;Array signal processing;Parameter estimation;MUSIC algorithm
Study on Preparation and Properties of Ramie Fiber Reinforced Composites
Authors: Li Hui , Zhang Yan Fei , Liu Ya Qing , Zhao Gui Zhe , Du Rui Kui
Published: June 2013

Ramie fibres were surface treated in order to enhance the interfacial interaction between ramie natural fibres and vinyl resin matrix. The fibres are exposed to three different treatment ways in this paper. The surface topography and binding force influenced by the treatments were characterized by contact angle and mechanical property. Single fibre pull-out tests combined with SEM characterization of the fracture surfaces were used to identify the interfacial strengths and to reveal the mechanisms of failure.
Study on Fault-Tolerant Technique Based on Knowledge Modules of Hydraulic Fault Theory
Authors: Liu Tai , Yu Jin , Sun Wei Jian
Published: June 2013

Fluid power transmission and control, fuzzy control and related fault-tolerant control technology, which have been widely used, as the core of control and power transmission. At the same time the hydraulic system is developing to be large-scale and complicated, which makes the high reliability and safety more and more important. There is no doubt that the researches conducted in the hydraulic system of fault tolerant control field will create significant value in application. This article summarizes the Knowledge Modules of Hydraulic Fault (KMHF), which is the necessary premise to carry out researches on the fault-tolerant techniques based on Knowledge Modules of Hydraulic Fault. On this basis, this article takes the pressure-flow compound control module as an example, introduces the principle design, analyzes the static and dynamic of their pressure /flow control unit. Especially, the paper employs the simulation tools-AMESim, to conduct simulation calculation and analysis of the pressure perception control module which is based on Knowledge Modules of Hydraulic Fault. Besides, this paper has carried out experiments on the automatic hydraulic drill platform to research the test fault-tolerant control performance of the pressure perception control module. The simulation and test results show that the new fluid fault-tolerant technique based on Knowledge Modules of Hydraulic Fault proposed in this article practically improves the reliability and safety of the hydraulic system, and has great value for application.
Research of Nozzle Divergent Section Detection Based on Modal Flexibility Curvature Difference Method
Authors: Xu Zhi Gao , Wang Qiao , Ma Jing
Published: June 2013

A method based on modal analysis is put forward to solve the problem of detecting the debond defects of solid rocket motor nozzle divergent section in service. The modal flexibility curvature difference is used to identify the debond defects. The locations and sizes of debond defects can be estimated accurately. The results of simulations indicate that the inspection speed and efficiency are much higher than those of ultrasonic method are. The method is easy to realize outfield detection. This method can be applied to identify the debond defects of the nozzle divergent section or multilayer composite structure. It provides theoretical guidance and methodological reference for debond defects detection of multilayer composite structure.
Simulation Study on Jet Power Drive System of Quarter Vehicle
Authors: Fu Qiang , Sun Xue Ling , Cai Ming Xiu
Published: June 2013

Jet power drive system of quarter vehicle is put forwarded to improve starting drive efficiency. It analyzes JPD working principle, adds a jet power and researches for the basic simulation of control model with slip-rate as the control object based on PID control theory. The academic feasibility of jet power drive system is expatiated, that is based on the principle of compressed air power which is applied to the starting drive system, then establishes dynamics model of a new automotive anti-slip drive system and simulation model of ASR&JPD by the MATLAB/Simulink. The simulation tests are designed to compare with the curves of vehicle speed and driving wheel velocity using the JPD. The graph proves that JPD can reduce starting drive distance at 21%--77% and starting drive time at 12%--70%. Augmentation rate of vehicle acceleration exceeds 50%. The results show that the ASR&JPD can increase starting drive efficiency.
Research of the Tool Orientation Optimization with Kinematical Constraints
Authors: Liu Hong Jun , Cao Jing Yu , Zhao Ji Bin
Published: June 2013

Drastic change of the tool axis vector for five-axis CNC machining due to avoid global interference, proposed gentle forward, over-backward correction method to optimize the tool axis vector. Established a machine tool axis of rotation angular velocity constraints, and feed coordinate system, through the feed coordinate system adjust the inclination angle and swing angle of the existing tool axis vector to make the tool axis vector change between each adjacent cutter contact points satisfy the machine axis of rotation kinematics constraints and to ensure the continuity of feed rate during processing. Algorithm simulation examples show that the proposed method is reasonably practicable, make the tool axis vector changes fairing to ensure the smooth and efficient processing.
Simulation and Analysis on Stationary Combination Valve of Heavy-Duty Vehicle Automatic Transmission
Authors: Zhang Yan , Ma Wen Xing , Xu Wen
Published: June 2013

A mathematical model and dynamic characteristics simulation model were established based on working principle of stationary combination valve in order to study shift quality of heavy-duty vehicle automatic transmission. Various parameters on buffer characteristics influence and outer diameter of the clutch hydraulic cylinder, the spring stiffness and preload influenced on the buffer time, starting pressure and termination pressure were gained with using batch function. The results show that the smaller the orifice diameter, spring stiffness and preload is, the longer the buffer time is, and the curve of buffer characteristic is downward translation. The larger the outer diameter of the clutch hydraulic cylinder, spring stiffness and preload is, the shorter the buffer time is, while the initial pressure and the termination pressure are relatively lower.
Temperature Prediction Model for Molten Steel in RH Refining Process
Authors: Xia Tia , He Zhu
Published: June 2013

A mathematical model for the RH refining process was developed and validated by the measured molten steel temperature in situ. It is showed that the model predicted temperature matched the measured value well and the average errors within ±5°C were 86.9%. The model results also showed that for every increase of 100°C of the initial temperature of the chamber inwall , the average molten steel temperature increased by about 8°C. For every blowing extra 50m3 oxygen, the steel temperature increased by about 7°C.
MEMS Scanning Mirror with Vertical Comb Actuator Based on Latching Technique
Authors: Chen Qing Hua , Li Yan Mei , Chen Ying Jun , Wu Wen Gang
Published: June 2013

A MEMS(Micro-Electro-Mechanical Systems) scanning mirror with vertical comb actuator was designed, modeled, fabricated and tested, which can be widely applied in scanning micromirrors, optical switches, and variable capacitors. Purposive latching has been successfully applied to the batch fabrication of vertical comb actuators made of silicon on insulator (SOI). The manufacturing process is introduced, and a novel design of latching structure and mechanical spring is also presented. The latching of microstructures is enabled in a controlled manner and significantly reduces the distance between the combs, reducing the driving voltage. The prototype microactuators operate at the driving voltage of 28 Vdc with 9.6 optical angle. A reliability test on an unpackaged actuator with more than 100 million cycles of operation showed extremely small variation in the scanning angle and the driving voltage, showing no sign of degradation in the induced latching interface or the microstructures.
Fast Response MEMS VOA with Grid-Type Shutter
Authors: Chen Qing Hua , Li Yan Mei , Chen Ying Jun , Wu Wen Gang
Published: June 2013

In this paper, a microelectromechanical variable optical attenuator (VOA) with grid-type shutter is described. The device is used to control the power in the all optical nelworks. Besides the advantage of good switching performance and the relatively low driving voltage, its fabrication is simple and reliable. In our laboratory, a MEMS VOA with grid-type shutter has been fabricated and setup for investigation. Experimental results have shown that the proposed approaches improve the VOA performance.
The Research of High Reliability Secondary Power on Orbiting Carbon Observatory
Authors: Wang Xiao Peng , Wang Jing , Yu Ping , Qi Xin Da , Li Xian Feng , Wang Yan
Published: June 2013

On the research of Orbiting Carbon Observatory (OCO),There is a demand to design a power system of high-reliability, to ensure the life of the OCO. The DC/DC has been widely used in the secondary power supply in aerospace engineering with its high reliability, high integration and high efficiency. In the space, it is easy to introduce various forms of interference and noise, affect the reliability of power supply directly, thereby affecting the OCO's technical performance. To improve the reliability of the secondary power, a number of key technical discussions is taken on the Secondary Power design. Include: DC/DC, Redundancy, Derating , EMC, Heat. After taking such measures, the reliability of the secondary power supply is greatly improved, All the result of the experiment and actual application shows that the anti-interference design are effective.
Solid State Chemical Reaction Synthesis and Characterization of Nanocrystalline Cerium 8-Quinolinolate
Authors: Li Dao Hua , He Shao Fen , Chen Jie
Published: June 2013

Under the conditions of the presence of surfactants and ultrasonication, the use of different cerium salt, respectively, with 8-quinolinolate under solid state chemical reactions, the synthesis of nanorare earth metal complexes of cerium 8-quinolinolate crystals was formed. The solid phase was characterized by powder X-ray diffraction (XRD) and electron diffraction (ED). The particle size, its distribution, and morphology of the prepared nanocrystallite were observed by transmission electron microscopy (TEM). The results show that particle sizes are relatively uniform, the morphology of the crystal is spherical, the average particle diameter is about 30 nm, and the yield rate is approximately 89.9%. Furthermore, during the synthesis, the solid-state reaction conditions including raw materials, matching proportion of reactants, additions of inert substance, addition of trace solvents, surfactants and porphyrization time, etc, all have some influence on the morphology, particle size and size distribution of the final products. During the synthesis of the cerium 8-quinolinolate nanocrystallites, the solid state reaction conditions such as changing reactant, matching proportion of reactant, adding inert substance, joining a little solvent or surface active solvent and grinding at different times may influence morphology, particle size and the size distribution of final products.
Real-Time Forward Position Kinematics of the Spatial Parallel Manipulator
Authors: Mi Jian Wei , Du Li , Duan Xue Chao
Published: June 2013

Aiming at online implementation, a real-time algorithm for forward position kinematics of the parallel manipulators is proposed, in which the steepest decent direction of the solution iteration is constructed with Jacobian matrix, with the initial position for iteration arbitrarily chosen from the workspace. Under the condition of motion continuity of the end-effector, the unique forward position kinematics solution can be found out with this algorithm. Forward position kinematics case studies of spatial parallel manipulators were conducted, which show that the algorithm has the advantages of a high precision, little iteration and less millisecond-level time consumption.
Texture Feature Extraction for Color Images Based on Quaternion Representation
Authors: Huang Chuan Bo , Zhou Zi Ping
Published: June 2013

In order to get texture features of color image, we proposed a new algorithm which is adapted to extract the texture features for color images in this paper. Firstly, the proposed method adopt quaternion to color image processing that can represent the color image in a holistic manner and parallel processing the R, G and B components. Secondly, we can obtain the directional information and texture features by Quaternion Gabor Filter. The experimental results show that texture feature obtained by our method has good the discrimination power and classifing performance.
Mine Loadometer License Plate Recognition Based on MFF-DS
Authors: Guo Xiu Cai , Zhang Shi Qian
Published: June 2013

The result of license plate recognition with a single feature is unsatisfactory. A multi-feature fusion method based on D-S evidence theory is proposed to improve results of mine loadometer license plate recognition. Firstly, three kinds of features including contour, projection and trellis-coded are extracted from the vehicle plate character image. Then the Basic Probability Assignment (BPA) is defined to get the credibility of recognition results by using the multi-class Support Vector Machine (SVM) with one-against-one method. Finally, D-S evidence theory is employed to integrate the credibility of evidences for making a final decision. The experimental results show that the multi-feature fusion method has higher recognition rate, fault tolerance and robustness.
Preparation of Monodisperse Iron Nanoparticles at Low Temperature
Authors: Lin Tao , Lv Shao Yuan , Shao Hui Ping , Sun Sen
Published: June 2013

Monodisperse iron nanoparticles were prepared by thermal decomposition of iron carbonyl at low temperature of 160 oC - 180 oC in kerosene. The synthesized iron nanoparticles were spherical and their average size was decreased from 11.2nm to 8.6 nm as increasing the reaction temperature from 160 oC to 180 oC, respectively. The synthesized iron nanoparticles are amorphous, but the surface of the particles is easily oxidized and to be spinel structured iron oxide by HRTEM.
Research on Solder Joints Quality Detection of Auto Parts Based on Biological Vision Feature
Authors: Lin Chuan , Lv Xiao Feng , Cao Yi Jun , Wei Jiang Hua , Lin Cong
Published: June 2013

Detecting of the auto parts solder joints quality is always a technological difficulty in the production line, the key point is how to exact the parts feature which is tested. New quality detection method for the auto parts soldered joints is presented based on biology vision feature. First the Gabor filter banks which have the emulation of biological vision is used to filter the detected image with eight different directions. Then the biggest powers of all pixel points are chosen to be the solder joints feature and classified by support vector machine (SVM). The experimental results show that the algorithm has higher accuracy as an effective quality detection method. It can be a useful reference to the auto parts solder joints quality testing of engineering application.
Image Registration Method Based on PCA-SIFT Feature Detection
Authors: Wang Yan Wei , Yu Hui Li
Published: June 2013

SIFT (scale invariant key points) which can well handle images with varying orientation and zoom, is widely used in image registration, but the algorithm is complexity and the processing time is too long. Therefore we used the PCA-SIFT (Principle Components Analysis-scale invariant key points) in image registration. Compared the SIFT descriptor, the PCA-SIFT reduced the dimensions of SIFT feature, enhanced the matching accuracy and reduce the elapsed time. Then the mutual information method used in this paper to estimate the best points. Experimental results show that PCA-SIFT algorithm is simplified, robust and liable.
A New Gradual Segmentation Algorithm of Fingerprint Image
Authors: Wang Feng , Cao Hong Bing
Published: June 2013

Segmentation is an important part of fingerprint image preprocessing. Effective segmentation not only reduces the time of subsequent processing but also improves the reliability of feature extraction considerably. After introducing segmentation, we suggest improved mean and variance-orientation coherence gradual segmentation algorithm of fingerprint image. Morphology has been applied as preprocessing to reduce the number of classification errors. The algorithm is tested on FVC2002 database, only 0.79% of the blocks are misclassified, while the preprocessing further reduces this ratio. Experimental results verify the feasibility of this algorithm.
Load Forecasting by Considering Wind Power Based on Sequential Time Classification LSSVM Model
Authors: Yang Chen Jun , Zhang Ai Hui , Lu Hai Wei , Wu Gang , Ma Hai Yan , Gao Xiao Feng , Qin Ming
Published: June 2013

In recent years, with the large-scale grid connection of wind power, wind power as an important factor to load forecasting should not be overlooked; A least squares-support vector machine (LSSVM) has been improved for the region including wind power, based on the influence from the load caused by the changes of wind and the characteristics between load and wind power. The method uses the models of least squares-support vector machine to classify and build different models , and gets the integration of each model for equivalent load forecasting, which provides the reference for the region including wind power.
Box Parts Manufacturability Evaluation Based on Feature Model
Authors: Zhang Gong Tao , Zhang Fa Ping , Duan Xiao Feng , Gao Bo , Qin Lu Yao
Published: June 2013

In the box part design stage, for the realization of the design and manufacturing sector information sharing, box geometrical and non-geometrical information was integrated into the 3D model, to realize the product 3D digital definition. The feature evaluation rules by the relationship between the digital product definition and manufacturing resource information was builded and preferred algorithm of the machines based on the theory of analytic hierarchy process was established to choose the most appropriate manufacturing resources which can help product process design.
A Study on CIF-to-BMP Format Transformation Algorithm
Authors: Wang Jun Ping , Qi Su Yang , Xu Dan
Published: June 2013

In the prediction and improvement of integrated circuit yield, it needs to convert CIF file to BMP file in order to calculate the critical area accurately and optimize the subsequent layout, at the same time, the image format of layout is the foundation of random defects hot spot detection. Firstly, the structures of CIF file and BMP file are studied, and various commands of CIF are deeply analyzed. Secondly, we design the algorithm that is based on the primitives are converted into BMP according to the representation of four basic primitives (rectangle, polygon, circularity, line with width) in CIF layout. Finally, we realize the algorithm of the whole CIF files is converted into BMP files. It is simple, conversion accuracy is high, more importantly, laid the foundation for the improvement of integrated circuit yield, and use C++ language to realize the CIF files conversion software based on the algorithm.
Research on Jiangxi Tourism E-Commerce Site Planning
Authors: Zeng Zhou Yu , Song Jin Bo
Published: June 2013

With the surge in the rapid development of the Internet and the number of Internet users, Jiangxi tourism e-commerce sites should continue to improve, and to seize the online customer base. In this paper to determine the site Jianzhan purpose, three aspects of of Jiangxi tourism e-commerce website design to offer some suggestions to determine the website target markets and rational planning of web content.
A New SVM Multi-Class Classification Algorithm Based on Sample Scale and Distribution Area
Authors: Qin Yu Ping , Qin Peng Da , Lun Shu Xian , Wang Yi
Published: June 2013

A new SVM multi-class classification algorithm is proposed. Firstly, the optimal binary tree is constructed by the scale and the distribution area of every class sample, and then the sub-classifiers are trained for every non-leaf node in the binary tree. For the sample to be classified, the classification is done from the root node until someone leaf node, and the corresponding class of the leaf node is the class of the sample. The experimental results show that the algorithm improves the classification precision and classification speed, especially in the situation that the sample scale is less but its distribution area is bigger, the algorithm can improve greatly the classification performance.
Music Source Separation Based on Improved Sinusoidal Modeling
Authors: Li Su Ping , Jiang Quan Sheng , Chang Hong Xia
Published: June 2013

Traditional sinusoidal modeling can not express spectrum of music signal factually as it only considers pitch characteristic. To solve this problem, an improved sinusoidal modeling of combining spectrum amplitude with pitch characteristic was proposed. Separation algorithm based on improved sinusoidal modeling extracts sinusoidal parameters of mix music signal utilizing sinusoidal analysis technology, and then applies grouping rules to assign these tracks to reconstruct the separated music signal. Simulation experiments demonstrate the feasibility and effectiveness of the proposed improved sinusoidal modeling separate algorithm.
Design and Implementation of Online Answering System
Authors: Mao Yang Hong , Chen Chui Xin
Published: June 2013

This design use Java technology to develop a separate interactive online answering platform, the system integrate common network teaching tools and most online interactive function, provide interactive online answering for teachers. Once teachers enter their own relate courses web pages, it has been easily built a full interactive online answering platform, In this system, including three subsystems: student terminal subsystem, teacher terminal subsystem and management terminal subsystem. Among them, student terminal subsystem is mainly provide student to login and participate in question-answering, teacher terminal subsystem is mainly provide teacher to login and manage their own student and question-answering, management terminal subsystem is mainly manage related and content users. After the test of practice, the systems practicability is strong, it can better solute the courses exchanges between teacher and student.
Research on Trees Static and Dynamic Modeling Method
Authors: Yang Feng , Yu Shun , Li Tie Nan , Wang Ying Bo
Published: June 2013

Almost all the fields use tree modeling in society. But it is difficult to find an efficient tree modeling method because its own complexity and wind, rain acting on tree. This paper constructs tree static modeling with expanding 2.5D modeling method and collision principle. The object suffers wind power that the force calculated by momentum theorem. And then compare the value of rupture limit to Young modulus. It is determined object to fracture or sway. Then it constructs tree dynamic modeling in the nature.
Research on Modeling and Simulation of Networked Air & Missile Defense
Authors: Zhu Zhi , Zhu Ning , Lei Yong Lin , Li Qun
Published: June 2013

As a Network Centric Warfare (NCW) case applied in Air & Missile Defense domain, Networked Air & Missile Defense (NAMD) represents the superior development of the Air & Missile Defense warfare in future. Based on the ideology of Integrated Fire Control, architecture and characteristics of NAMD are depicted, and simulation models based on above depictions are designed. Finally, operational capabilities of NAMD are generally evaluated, and the rationalities of decision-making script and model framework are validated by concentrating on results of an operational scenario simulation.
Power System Data Quality Evaluation Based on the Analytic Hierarchy Process
Authors: Wang Xi Liang , Qin Xuan , Liu Dao Xin , Wang Zi Jian , Wang Jun , Xu Hui Ming , Qin Ming
Published: June 2013

The demand for electric power data is more and more widely, and put forward higher requirements to the quality of statistical data. This paper combined with the features of electric power data. Evaluate data quality from the accuracy, completeness, uniqueness, consistency, accuracy, efficiency and timeliness seven aspects. And put forward the specific evaluation methods of each evaluation index. Then build a whole data quality evaluation process on this basis, quantitative analysis the data in the database, to acquaintance the data quality condition.
The Design for High-Power Maglev Blower Controller
Authors: Yu Wen Tao , Li Hong Wei , Liu Shu Qin , Zhang Yun Peng
Published: June 2013

The maglev blower used in sewage treatment, which power is 115kW, speed up to 20000rpm, for plain bearing blower speed 6-8 times, volume is only 1/4 of the plain bearing and the noise is less than 80dB. The controller uses a DSP and FPGA dual-core controller to complete. DSP process the rotor suspension signal with digital bandstop filter program and improved PID program, FPGA complete the current signal amplification.Two chip via custom protocol to complete the data transfer. It is successful application of the controller that used in the magnetic bearing blower.
Design of Control System for Concrete Mixing Station
Authors: Zhang Shuan Ji , Jiang Yi Da , Zhang Min Zhe
Published: June 2013

This paper analyzes the concrete mixing station control system problems, puts forward the total design scheme, and designs the hardware and software of programmable logic controller. In the software project, focusing on the automatic run program, aggregate discharge procedures, two feeding procedures, alarm procedures. The design also uses intermediate temporary storage technology, pressurized water discharge technology. The experiments prove that the system is reliable, simple operation, convenient maintenance, good effect.
Back-Stepping Adaptive Attitude Control of Over-Actuated Spacecraft
Authors: Fang Hui , Gong Jun Hui
Published: June 2013

A novel robust adaptive back-stepping control scheme for attitude maneuver of over-actuated spacecraft system with redundant reaction fly-wheels (RWs) is proposed. The robust adaptive controller based on back-stepping may achieve the high accuracy and speed of the attitude control for the rigid spacecraft with uncertain inertia matrix and bounded external disturbs. The Lyapunov functions are employed to analyze and prove the systems stability, so the fine and accuracy performances are ensured. The numerical simulation results verify the effectiveness and feasibility of the control schemes derived here using the MATLAB/SIMULINK software.
Design of Simulating Control System on Marine Oily Water Separator
Authors: Jin Jian Guo , Wang Zong Tao , Li Lei Bin
Published: June 2013

It is important for the marine engineers to master the control principle with the widely application of PLC technology on marine equipment. Basing on the characteristic of marine oily water separator, a simulating control system on marine oily water separator was designed with PLC technology to meet the need of marine engineer training and competence assessment. The system integrates drawing bilge water, separating oil and water, draining off water, draining off oil and alarm of oil content high together. With running reliable and operating simple, it helps marine engineers/ trainees to master the control principle of marine oily water separator.
Maturity Management Strategy for Product Collaborative Design
Authors: Chen Ming , Liu Jin Fei
Published: June 2013

In order to improve the product’s design efficiency, decrease the period of the development cycle and ensure the effectiveness and the controllability of product information, this paper put forward a strategy of product maturity for collaborative design. First, the concept and the applicability of product maturity based on the product life management are discussed. The definition and the classification of product maturity are put forward in the process of product collaborative design. Then, the model of product design has been built based on the definition and the classification of product maturity. Finally, this paper provides the application of product maturity in the collaborative design on the collaborative development platform to verify the effectiveness and the controllability of the strategy.
The Study of Material Texture Image Model by Kansei Engineering
Authors: Zhou Yan , Tang Ruo Yue , Yang Ping
Published: June 2013

In order to precisely describe material texture image and establish a quantitative relationship of the materials objective parameters and the subjective feeling, here, this article takes the typical plastic material as example and uses the method related with Kansei Engineering as study method. The study of material texture image experiment was conducted by discriminate analysis, cluster analysis, multidimensional scaling, semantic differential method and so on to quantified consumers perceptual cognitive on materials, and to build a mathematical model by neural network. This study could provide a theoretical basis for materials selection in industrial design.