bluuebunny/crossref_metadata_2025 huggingface dataset:
The Research on Pan-Genes of an Object Boundary
Authors: Tian Jun Ying , Han Jian Hai , Chen Hong Lin
Published: July 2011

The aim of this paper is to give some researches and instructions of relations between the special shapes of an object boundary and their 8-adjacency chain code strings, characteristics of these chain code strings, internal relations among these chain code strings. These characteristics can be used to identify the region of an object boundary, when necessary, to generate this regional boundary. But this is irrelevant to various operations on image. This function of a chain code string is similar to the roles of genes in biology, is called pan-genes. An object boundary on binary image is considered by many tiny line segments connected with each other. The research on characteristics of chain code strings of line segments is an important segment of recognition and generation of an object boundary. This paper gives characteristics of chain code strings of pan-genes corresponding line segments, relations among these chain code strings, chain code string organization forms of chain code string units of line segments (these units are abbreviated with UL), the effective ways and methods on recognition and generation of line segments. Thus, this paper studies the chain code features of corners and circles. This paper gives a variety forms and features of ULs, shows the effects and methods on recognition and generation of an object boundary, gets basic properties of chain code strings about corners and circles.
Research on License Plate Recognition System Based on Computer Vision
Authors: Wang Ye Qin , Chen Liang Hai , Zhuang Li Yun
Published: July 2011

In order to achieve the exact location and character recognition of license plate, firstly, this paper got binary image of license plate and done edge detection with differential operation. Secondly, it searched the license plate binary image after difference for the horizontal and vertical cut point, and determined the best cutting threshold through the experiment. Finally, it made the character segmentation by vertical projection, the recognition of license plate characters with the use of BP neural network, whose overall recognition rate is at 95.3%, and the display interface design for program transfer and results display. The experimental results showed that the location of license plate was exact and the character recognition rate was high.
National Technological Innovation Output Capacity Forecast and its Influence Factors Analyses in China
Authors: Li Xiao Hong
Published: July 2011

This paper aims to measure nation technological innovation output capacity and its developing tendency of China. The influence factors that impact the output of national innovation mainly come from three aspects. They are technological innovation activities, innovation external environment, and potential technological innovation resources. We finally adopt four factors (Expenditure for R&D (X1), Governmental capitals for R&D with percentage of GDP (X2), R&D persons per million labors (X3), Expenses of public education with percentage of GDP (X4)) to estimate the innovation output (measure by number of patents application accepted). Results of regression model that uses statistical data from 1989 to 2009 indicate total degree of correlation between them is 99.9%. All Variables play significant linear actions to dependent variables Y except X4. The number of patents application accepted per million persons is 9.518 (1276 thousand pieces in total) in 2010, with an error of 4.42%. This study may be useful for innovation output prediction and relevant decision making of China.
A Forecasting Model of RBF Neural Network Based on Particle Swarm Optimization
Authors: Pan Yu Min , Huang Cheng Yu , Zhang Quan Zhu
Published: July 2011

In order to improve the precision of gas emission forecasting,this paper proposes a new forecasting model based on Particle Swarm Optimization (PSO).PSO is a novel random optimization method which has extensive capability of global optimization.In the model, PSO is used to optimize the weight,width and center of RBF neural network and the optimal model is applied to forecast gas emission.The diversified factors analysised with grey correlation,MATLAB is employed to implement the model for gas emission forecasting.The simulation results show that the gas emission model optimized by PSO is more accurate than the traditional RBF model．
Optimize Study of Pressure Die-Casting Technology for Producing Motor Rotator
Authors: Yang Ya Qin
Published: July 2011

Motor rotator is one of the most important cast aluminum members. The configuration is so complex that it spends so much calculation and time by experimental method using multi-program. This paper mainly researched several main parameters by using scientific experimental method, thus introduced a simple project with optimized parameters in order to achieve a goal that can reduce in workload and improve the quality of castings.
Axial and Circumferential Automatic Chromatographic Control System of Gravure Printing Machine
Authors: Zhang Lin , Zhang Mei Yun , Wu Yang Yu
Published: July 2011

An automatic chromatographic control system which can adjust deviation axially and circumferentially was proposed, the multi-chip microcontroller 89S52 was used as the controller, and the non-interfering axial and circumferential system can work independently. The corresponding hardware circuit and software designing were provided, and the simulation experiment was applied to demonstrate the feasibility of the system.
Sensitivity Analysis of DVG850 High-Speed Vertical Machining Center Headstock
Authors: Zhang Gong Xue , Han Bing Bing , Liu Chao Feng , Gu Yu Fang , Shen Xiao Kai
Published: July 2011

The headstock is one of the most important parts of a machining center, however there are a lot of designing variables that may influence the static and dynamic capability of the headstock. How to find these variables and optimize them seems to be very important. In this paper, using the modal frequency as the performance index, Pro/Mechanical was used to analyse the sensitivity of the DVG850 high-speed vertical machining center headstock. The result of the analysis was a set of main design-variables that influence the first-order natural frequency of the headstock. The machine’s typical operating conditions were compared against the results of the sensitivity analysis. This provided a basis for structural design and optimization of the headstock directly and quickly.
Machining Center Worktable Static Stiffness Spectrum Drawing and Analysis
Authors: Zhang Gong Xue , Gu Yu Fang , Han Bing Bing , Shen Xiao Kai
Published: July 2011

The main work is calculating and analyzing the worktable’s static stiffness in different positions, and drawing 3D static stiffness spectrum of the worktable in Z direction according to the analyzing results. DVG850 High-speed machining centre is taken as the research object, to establish the solid modal in ANSYS Workbench and analyze the worktable’s static stiffness in different positions. and the paper uses its worktable as the researching object. According to the results the spectrum of the static stiffness of the worktable is drawing in Matlab. The spectrum shows that the more the position is near the edge, the larger the static stiffness is, and it changes faster, however the middle is smaller. This spectrum has certain directive significance for the optimal design and improvement of product quality of design.
Time-Varying Delay Global Stability of Neural Networks
Authors: Huang Dong Ming , Sun Lei
Published: July 2011

Hopfield neural networks with variable delay stability of the equilibrium point, the delayed neural network analysis of exponential convergence rate and exponential stability. Obtained by using Lyapunov functional stability of the index to determine the conditions, the use of a number of analytical methods to study the connection weight matrix and activation function of the boundary, has been the result of system is exponentially stable, and a numerical example to prove that the method effectiveness.
Research on Integrated Scheduling Model of Automated High-Rise Warehouse and Traditional Flat Storehouse for Cigarette Distribution Center
Authors: Tong Xin Shun , Yang Li Hua
Published: July 2011

Along with the market demand increasing, cigarette distribution center urgently needs to improve their working efficiency by reasonable storage modeal. This paper proposed an integrated scheduling model of automated high-rise warehouse combined with traditional flat storehouse, by planning the storage capacity in traditional flat storehouse and optimizing the storage spaces in automated high-rise warehouse, ensuring intelligent management while achieving flexible storage operations. This model effectively shortened the operating time compared to other storage models. Finally take Zhengzhou Cigarette Distribution Center as an example to analyze.
The Design of Closed-Loop Digital Fluxgate Sensor
Authors: Ji Qing Hua , Jia Meng
Published: July 2011

In term of the problems that the traditional fluxgate sensors with analog circuit have low temperature adjust ability, the paper does research on closed-loop fluxgate sensors. It takes advantage of high speed AD signal collecting sensor, disposes the signals by single chip, and outputs analog signals by DA chips. It describes the hardware environment and software design, and tests the magnetic field by the new sensor. The results show that: its original temperature coefficient is 6.7×10-10/°C, sensitive temperature coefficient is 2.5×10-4/°C and its linearity comes to 5.4×10-3.
A Novel Test System of High Energy Efficiency for Emulsion Pump
Authors: Li Yi Lei , Zhu Zhen Cai , Chen Guoan
Published: July 2011

This paper presents a novel test system for emulsion pump to save the energy consumed by the conventional test system in the coal industry standard MT/T188.2-2000. First, the detailed information of this system was described to explain how this system functioned as designed and how the power recovery was realized. Then simulations within AMEsim were carried out to validate the feasibility and capability of this system, and the results were discussed and compared. Finally it was testified that this novel system could save nearly 90 percent of energy consumed by the original test system while still accorded with the test standard.
Application of AR Technology in Industrial Design Product Review
Authors: An Jun , Fan Jin Song
Published: July 2011

Design review is a very important step in Industrial Design. Based on the analysis of physical prototype, digital prototype and virtual prototype in this paper, augmented reality technology was employed in Industrial Design and an augmented product model evaluation environment was established in order to make a comprehensive product design review. By importing 3DS data, realistic product models in AR environment were obtained and evaluators can perform some manipulations, such as selecting, rotating, moving, scaling and material transforming with mouse, keyboard, marking object and virtual panels. In this way, evaluators can fully understand design ideals and can make comprehensive product review effectively, and the quality of design review was improved.
Multiple-Depot Vehicle Routing Problems as a Distributed Constraint Optimization Problem
Authors: Lei Xing Ming , Xing Chang Feng , Wu Ling , Wen Yun Feng
Published: July 2011

The Distributed Constraint Optimization Problem (DCOP) is able to model a variety of distributed reasoning tasks that arise in multi-agent systems, and widely applying to distribute programming, scheduling and resource allocation etc. In order to solve the multi-depot vehicle routing problem (MDVRP) in distributed manner, this article show how DCOP can be used to model the MDVRP, and using existing various DCOP algorithm solve it base on Frodo simulation platform. We have evaluated the performances of various DCOP algorithms on an existing MDVRP.
Vibration Control of a Space Flexible Robot Manipulator Using PZT Actuators
Authors: Lou Jun Qiang , Wei Yan Ding
Published: July 2011

The dynamic analysis and control of flexible robot manipulators have been the main concerns of many recent studies in aeronautics and robotics. Moreover, the complexity of this problem increases when a flexible manipulator carries a payload. In this paper, we proposed a space two-link flexible manipulator with tip payload featuring surface-bonded piezoelectric torsional actuator and shear actuator. The equations of motion for the system are obtained using Hamilton’s principle. A Lyapunov-based controller is proposed to suppress the vibration of the system. Stability of the system is also investigated. The simulation results demonstrate the proposed control strategy is well suited for active control of vibration suppression on flexible manipulators.
Research on the Analysis of Coiled Tubing Fatigue Life
Authors: Ji Ya Feng , Zhang Hong , Duan Qing Quan , Cao Yan Bin
Published: July 2011

Coiled tubing (CT) and coiled tubing units (CTU) technology has been widely used in oil and gas field since World War II. Coiled tubing fatigue failure is one of the constraints on promoting used. CT bears complex loads, leading to multiple plastic deformations when operating. Then the fatigue damage cannot be ignored. Through the mechanics analysis of CT with finite element method (FEM) in working state at the wellhead, the results show that high stress and high strain are the main factors which cause CT failure. Based on the analysis, the fatigue life is predicted for CT without defects by using Manson-Coffin formula. The results of CT with different inner pressure show that simulations result is closer to the actual working conditions.
Bionic Integration of the Spherical Parallel Shoulder Joint with the Six-Component Force Sensor
Authors: Zhou Yu Lin , Hou Yu Lei , Qiu Xue Song
Published: July 2011

Based on the bionics principle, this paper proposed the idea of bionic design of the spherical parallel shoulder joint integrated with the six-component force sensor. The static analysis of the 3-RRS mechanism, which can be taken as a prototype mechanism of shoulder joint of humanoid robot, was carried out. And the relationship figures between the forces and torques acted on each component and the pose of the mechanism were obtained. The measurement of the external load and driving torques, which was employed to judge operability of arm to the target object under arbitrary pose, was realized by introducing resistance measurement method in the mechanism. The bionic integration of the shoulder joint with six-component force sensor made arm has some functions such as to avoid overload and singular area voluntarily, and realize self-protection. The contents of this paper lay a foundation of compliant control of humanoid robot arm and have important significance and value in engineering.
The Size Effect on the Voltage-Dependent Frequency of Fixed-Fixed Carbon Nanotubes Resonator
Authors: Liao X. , Zhou W. , Guo Z.Y. , Peng Bei
Published: July 2011

This work studies the size effect on voltage-dependent resonant frequency of fixed-fixed carbon nanotubes (CNTs) resonator. Specifically, the effect of resonator length, diameter, and gap distance on the variation of the natural frequency under the DC bias voltage is investigated. The resonator is modeled as a cylindrical beam whose ends are ideally fixed on the substrate. Under the condition of neglecting the impact of van der force (gap larger than 100nm), both elastic forces and the electrostatic forces are considered in this study. The variation of frequency with the DC bias voltage is usually decreasing, because the mechanical stiffness is larger than the electrostatic stiffness. But in some case, the effect of the mid-plane stretching dominates that of the electrostatic forcing, and the variation is increasing. Our results shows that the trend of variation is much depend on the size effect of device, especially the size of CNTs diameter. This fact is useful for designers to optimal design of CNTs resonators, either for tunable or stable resonators within a certain range of DC bias voltage.
A New Method of Designing Underwater Towed System
Authors: Feng Da Kui , Zhao Wei Wen , Pei Wu Bo , Ma Ya Cheng
Published: July 2011

A hydrodynamic model of towed system is studied. The model of towed cable in this paper is based on the Ablow and Schechter method. A basic problem in the design of towed system is presented by the choice of Euler angles and tension at ending point of cable. This paper proposes a new way to design an ideal towed system. And a code is written to assist in designing the towed system. The governing equation is solved using a 4th-order Runger-Kutta numerical method for stable cable. The computed results with the code are close to the measured ones.
Influence of Boundary Conditions on the Active Control of Vibration and Sound Radiation for a Circular Cylindrical Shell
Authors: Dai Lu , Yang Tie Jun , Sun Yao , Liu Ji Xin
Published: July 2011

Vibration and acoustic radiation of circular cylindrical shells are hot topics in the structural engineering field. However for a long period, this sort of problems is only limit to classical homogeneous boundary conditions. In this paper, the vibration of a circular cylindrical shell with elastic boundary supports is studied using modified Fourier series method, and the far-field pressure for a baffled shell is calculated by Helmholtz integral equation. Active control of vibration and acoustic radiation are carried out by minimizing structural kinetic energy and radiated acoustic power respectively. The influence of boundary conditions on the active control is investigated throughout several numerical examples. It is shown that the active control of vibration and acoustic for an elastically restrained shell can exhibit unexpected and complicated behaviors.
Neuro-Fuzzy Controller for Rudder Roll Stabilization of Ships
Authors: Wang Ming Hui , Yu Yong Quan , Zeng Bi
Published: July 2011

The uncertainty of ship models and interferences can lead to reduce the effectiveness of conventional roll stabilization controller depending upon accurate mathematical model.This paper proposes the design of neuro-fuzzy controller for rudder roll stabilization. Learning ability of neural network is utilized to optimize the fuzzy controller. Hybrid learning rule which is a combination of backpropagation algorithm and least square estimator is utilized to realized parameter adjustment of fuzzy control rule and membership function in order to improve the adaptive capacity of controller. The simulation tests under various situations such as different navigational speed, sea conditions, wave-to-course angle and ship parameter perturbation are to check the performance of roll stabilizatin controller. Simulation results show that the neuro-fuzzy controller has better robustness and effectiveness for rudder roll stabilization in beam seas.
Research on Specific Structural Parameters of Modified-Tooth Tap for Titanium Alloy TC4
Authors: Tang Y.L. , Han Rong Di , Geng Lin , Ju Jia Bin
Published: July 2011

With Third Wave AdvantEdge FEM software, an equivalent finite element model in tapping has been built, making a simulation study of the chip curling of titanium alloy TC4 and analyzing the influnce of a tap hook angle and chip flute shape on chip curling. Based on the simulation study above, the modified-tooth taps made of high-speed steel W9, which have two types of chip flute shape with a chamfer angle of 7°30´and respectively, were developed and the comparative tests of tapping TC4 have been done. The results indicates that the chip removal effects in hand tapping with the standard flute shape and respectively are on the same level, but the tapping torque has become smaller and more effective to a chamfer angle of .
Vibration Analysis of Beams with Arbitrary Elastic Boundary Conditions
Authors: Lv Bing Lin , Li Wan You , Dai Jun , Zhou Hai Jun , Guo Fei Xiang , Gao Zhan Bin
Published: July 2011

In this paper, one newly developed method named the Improved Fourier Series method is applied to the vibration analysis of a beam elastically supported at the both end. The flexural displacement of the beam is supposed to be one set of Fourier Series coupled with four appended terms. Based on the Rayleigh-Ritz procedure and and the vibration characteristics of the beam are also acquired by solving these two matrices. In the end, the frequencies calculated are also compared with those from references and Results ar the Hamilton’s equation, the mass matrices and the stiffness matrices of the beam are obtained e all proved excellent.
Analysis of the Planar Magnetic Field of Linear Permanent Magnet Halbach Array
Authors: Zhang Xiao , Li Yun Gang , Cheng Hu , Liu Heng Kun
Published: July 2011

In this paper, the analytical solution to the planar magnetic field of a linear permanent magnet Halbach array is researched on. First, the magnetic field of a current surface is derived from the magnetic field produced by the molecular current of the permanent magnet. The magnetic fields of pieces of permanent magnet with vertical and diagonal magnetization direction are both solved by combining the magnetic field of current surfaces with different directions. Then the planar magnetic field of the entire linear permanent magnet Halbach array is obtained by calculating the vector addition of the magnetic field of all the permanent magnet cubes using Denavit-Hartenberg (D-H) transform technique, which yields the closed-form analytical expressions. The analytical algorithm proposed in this paper can be utilized to design and optimize the Halbach array, which in result can greatly simplify the calculation and expedite the progress. The effectiveness of the proposed method is evaluated by the finite element analysis software Maxwell.
Study on Simulation of Heat Transfer Tubes with Twisted-Tape Inserted
Authors: Lou Jian Zhong , Li Jian Ping , Dong Yi Jia , Wang Meng
Published: July 2011

The model of heat transfer tube was established to obtain the distribution of velocity field, temperature field and pressure field with the aid of the computational fluid dynamics (CFD). The effect of the twisted-tape on the distribution of all fields in the tube was discussed. Seven pipes were constructed with different torsion to examine the torsion ζand Re effect on the heat transfer and flow resistance. Nusselt number Nu and the ratio of pressure difference △P /△ P0 in the tube with and without twisted-tape inserted was used to measure the heat transfer and flow resistance. The results show that the twisted-tape and large Re can enhance heat-transfer efficiency to some extent in same conditions; however it also leads to the loss of flow resistance. Structure optimization by changing the parameters and Re is what we should consider for further research.
Research on Under-Actuated Ship States Estimation Using Algorithm Singular Value Decomposition UKF Based on Acceleration
Authors: Ma Yu Long , Han Jian Da , Zhao Yi Wen , He Yu Qing
Published: July 2011

To estimate the states and uncertainty of the under-actuated ship, the paper proposed a modified UKF algorithm—Singular Value Decomposition UKF based on acceleration, which simplifies the system reference equation, reduces the calculation complexity and increases the accuracy of the algorithm. The accuracy and calculation complexity of the algorithm are analyzed in detail. Numeric simulation demonstrates the effectiveness of the algorithm.
Effect of Moisture Content on the Permeability of Tailing Sand Samples Gathered from Ex Tin Mines in Perak State Malaysia
Authors: Abdullah A. , Sulaiman Shamsuddin , Baharudin B.T. Hang Tuah , Arifin M.K.A.M. , Vijayaram T.R.
Published: July 2011

Tailing sand is one of the residue minerals obtained after tin extraction. It contains silica in between 94% and 99.5% and available in abundance at the Kinta Valley, Perak State, Malaysia. Permeability is one of the important molding sand properties and considered much in the sand casting mold preparation. This molding sand property plays a vital role in the sand casting process and helps to remove the gases during the casting processing. In this research work, samples of tailing sands were gathered from four identified ex tin mines located at the Perak State, Malaysia. They were investigated by the standard sand testing procedures prescribed by the American Foundrymen Society (AFS). Sand specimens of size Ø50 mm×50 mm in height from various sand–water ratios bonded with 4% and 8% clay were compacted on applying three ramming blows of 6666 g each by using a Ridsdale-Dietert metric standard rammer. The specimens were tested for permeability number with the aid of a Ridsdale-Dietert permeability meter. Before the tests were conducted, the moisture content was measured by using a moisture analyzer. The results were compared with the properties of the molding sand samples collected from RCS Manufacturing Sdn. Bhd., the company supplying sand to the Proton Casting unit car manufacturing company. The molding sand sample sample bonded with 8% clay was found to have maximum permeability with an optimum allowable moisture content range of 3.5-6.0% and for the sand mixture bonded with 4% clay at 3.0-3.5% moisture.
Stress Corrosion Evaluation of the Overlay of Duplex Stainless Steel
Authors: Qiu Fei , Zhang Yi Liang , Wu Dao Wen
Published: July 2011

2205 duplex stainless steel is often welded on the surface contact of the corrosive media in projects to prevent stress corrosion in petrochemical facilities. To explore the application scope and feasibility of the solution ,two welding processes (automatic welding and manual welding), three kinds of the common corrosion environment (saturated hydrogen sulfide, magnesium chloride, calcium chloride) are studied by constant load tensile and micro-fracture analysis methods. its stress corrosion is evaluated comprehensively and the mathematical model of stress–life is established based on the experimental results. The results indicate that constant tensile load threshold sth automatic welding is the 0.45RP0.2, manual welding is the 0.4RP0.2 in saturated H2S environment, and the difference is 17%; all the samples remain intact after 96 hours in 0.9RP0.2 stress test of the calcium chloride environment, which shows excellent resistance to chloride stress corrosion. But the material doesn’t work well in the environment of boiling magnesium chloride solution.
A New Automated and High Speed Machinery System for Filling High Viscous Liquids
Authors: Li Zheng Jeremy
Published: July 2011

The application of automation to industries brings revolution for manufacturing techniques and allows more sophisticated, flexible, reliable, and cost-effective manufacturing process control. Automation is to use control system to reduce human labor intervention during manufacturing processes and production. It plays very important role and puts strong impact in industries. Automation is not only significantly increasing the production speed but also more accurately controlling product quality. The automated manufacturing can maintain consistent quality, shorten lead time, simplify material handling, optimize work flow, and meet the product demand for flexibility and convertibility in production. The current economic globalization requires significant labor cost reduction through industry automation, better machine tools, and efficient production process. This paper is to design and develop a new automated and high speed machinery system for filling high viscous liquids. It includes the design of automated and high speed machinery, computer aided modeling and simulation of automated mechanical system, and prototype testing. The major advantages of this new automated and high speed liquid filling system include reliable function, high volume filling rates, good sealing capacity, and cost-effective manufacturing process. This new automated and high speed manufacturing systems has been analyzed by computer aided modeling and simulation, and verified through prototype testing. Both results indicate that this automated and high speed manufacturing systems can keep high product quantity and reliable product quality.
Microstructure Evolution and Corrosion Behavior of Directionally Solidified FeCoNiCrCu High Entropy Alloy
Authors: Cui Hong Bao , Zheng Li Feng , Wang Jin Yong
Published: July 2011

The microstructures of FeCoNiCrCu high entropy alloy were investigated under directional solidification. The results showed that only diffraction peak corresponding to a FCC crystal structure was observed in the directionally solidified FeCoNiCrCu alloy. With increasing solidification rate, the interface morphology would grows in planar, cellular and dendrite. Comparing the potentiodynamic polarization of as-cast and directionally solidified FeCoNiCrCu high entropy alloy in a 3.5%NaCl solution, it is clearly reveals that the corrosion resistance of directionally solidified FeCoNiCrCu alloy is superior to that of the as-cast FeCoNiCrCu alloy.
Finite Element Analysis of a Helmet with Superskin
Authors: Singh Aniruddh , Singhal Abhishek , Bhat Sunil
Published: July 2011

The paper presents load analysis of a Superskin layered helmet by finite element method. Results are compared with those of conventional crash helmet to evaluate the performance of Superskin in preventing rotational injury to the neck of the rider. Delamination of Superskin is observed that increases the safety of the rider. Solid Works and Mechanical APDL (Ansys12) softwares are used in the analysis.
Experimental Study on Pressure Fluctuations in the Shock/boundary Layer Interaction of an Axisymmetric Body
Authors: Xiao Hong , Gao Chao , Ma Zhen Kun
Published: July 2011

The characteristics of the fluctuating pressure for the 15° expansion corner of an axisymmetric body have been investigated experimentally using dynamic pressure measurements and Schlieren photograghs. Data were acquired over a Mach number ranging from 0.8 to 0.92. The angles of attack ranged from 0° to 5°. Pressure signals were measured simultaneously in several positions along the axis of model and were analyzed both in the time and frequency domains. The results indicate that large fluctuating pressure loads, resulting from the shock/boundary layer interaction exist at the transonic flow condition, because of the shock/boundary layer interaction. The maximal pressure fluctuation occurs after the expansion corner at Mach number 0.86. With the Mach number increasing, the position of the normal shock moves downstream. In the shock/boundary layer interaction region, the fluctuating pressure changes significantly with different angles of attack. Moreover, this interaction has a main effect of enhancing the power spectral density in low-frequency range (f≤5KHz).
Experimental Study on Pressure Fluctuations in the Boundary Layer of an Axisymmetric Body
Authors: Xiao Hong , Gao Chao , Ma Zhen Kun
Published: July 2011

The characteristics of the fluctuating pressure in the boundary layer of an axisymmetric body have been investigated experimentally using dynamic pressure measurements and Schlieren photograghs. Data were acquired at subsonic and super-sonic Mach numbers. The angles of attack ranged from 0° to 5°. Pressure signals were measured simultaneously in several positions along the model and were analyzed both in the time and frequency domains. The Mach number shows the relevant influence on . Furthermore, the pressure fluctuations’ level decreases with the increasing of Mach number except M=1.15. And it is shown that, the location along the axis of the model and the angles of attack have small effect on pressure fluctuations.
Colour and Nickel Release of Low Nickle White Gold Alloy with Mn Addition
Authors: Xiang Xiong Zhi , Bai Xiao Jun , Tang You Zheng , Niu Fei
Published: July 2011

In this paper, Au-Zn-Cu-Ni alloy series was take as a benchmark. Nickel element was replaced by Manganese in different ratios. The existing state and distribution law of Manganese, and the effects of the Manganese on microstructure and properties of gold alloys were studied. The mechanism of effects of Manganese on the colour and the release of nickel of gold alloys were discussed.
Constant Modulus Algorithm Based on Different Error Functions Weighted by Variable Coefficient
Authors: Zhou Qiao Xi , Guo Ye Cai
Published: July 2011

To improve equalization performance of the constant modulus algorithm (CMA), we study that error functions have an influence on the performance of the algorithm in this paper. Aiming at the character of different error functions, a new style of error function weighted by a variable coefficient is proposed. And a new CMA based on the new error function (VCMA) is proposed too. Because of variable-coefficient adjustability, the value of this new error function can become larger at the beginning of iteration and smaller at the end of iteration in the new algorithm. From gradient descent method, VCMA can have faster convergence rate and lower residual error than the CMA. Both theoretical analysis and experimental results have shown the effectiveness of the proposed algorithm.
Analysis and Numerical Simulation of GFP-SN Anchorage Mechanism on Laboratory Pullout Tests
Authors: Zhu Chuan Cheng , Fu Shao Jun , Shuai Ting , Lan Xu
Published: July 2011

As a new type of material, Glass Fiber Polymer-Soil nailing (GFP-SN) can replace the steel to be applied in the slope support, excavation support and other civil engineering. It was being concerned by more and more engineers. GFP-SN anchorage mechanism need be analysized and studied deeply to be used well. In this paper, numerical simulation software FLAC3Dwas used to simulate the pullout tests of GFP-SN. The results show that the diameter of GFP-SN, the embedded length of GFP-SN and the maximum pull force had great influence on the drawing force, the pull force is proportional with them. Besides, it is obvious that the embedded mode of GFP-SN has a certain influence on bar’s drawing force property.
Analysis on the Power Characteristics of Lift-Fan VTOL
Authors: Zheng Zhi Cheng , Zhu Xiao Ping , Chang Min , Zhou Zhou
Published: July 2011

Based on the propeller momentum theory, this paper obtained the momentum model for internal flow of lift fan system. It analyzed the influence of its conceptual parameters on power characteristics of lift-fan VTOL to analyze the trend changes of the total power required with the increase of freestream velocity. The results can be used for selecting parameters at the preliminary phase of designing lift-fan VTOL and determining the design parameters of lift-fan VTOL.
Design and Simulation on Investment Casting Mold for Metal Matrix Composite Material
Authors: Taufik  , Sulaiman Shamsuddin , Baharudin B.T. Hang Tuah , Arifin M.K.A.M. , Hambali Arep Ariff
Published: July 2011

This paper presents the design and simulation on investment casting mold for metal matrix composite material. The study was investigating the design parameters for the casting mold and simulated the temperature and pressure on the mold. Compressor impeller selected as the product of the study. Among the various types of casting techniques, investment casting process is the most suitable process to produce the compressor impeller. The alternative design of casting mold of investment casting was generated using CAD software. Concept scoring was prepared to select the suitable design for the investment casting process. Material selection of compressor is Aluminum Silicon Carbide. Stainless steel AISI H13 is selected as the material for the mold. The parameter for the mold design is included branch, gating, sprue and runner. The analysis was presented to the mold by using ANSYS simulation tool to determine the temperature and pressure of the mold. In addition, three case studies were presented and compared the static pressure in different velocity and temperature of the mold design. The result showed the runner and the branch size were important to produce the molten metal flow into the mold pattern. As a result, the design of investment casting mold was proposed.
The Casting Process Design and Simulation of the Front Wearing Plate of 10/8ST-AH Slurry Pump
Authors: Yin Ying Jie , Han Yan Jun , Zhi Xiao Hui
Published: July 2011

The casting process design and simulation of the front wearing plate of 10/8ST-AH slurry pump were presented in this paper. The casting process design principle, process parameters, points of attention, and the simulation parameters were introduced. Huazhu CAE was used to simulate the casting process. The STL document used in Huazhu CAE was converted from the 3D moulding of the casting process using the Solidwork software. The simulation results and practical production showed that the casting process can reduce shrinkage defects of the casting.
Research on Frequency-Tuned Dynamic Vibration Absorber
Authors: Jiang Shi Liang , Yang Tie Jun , Du Jing Tao , Hu Yin Yin
Published: July 2011

A frequency-tuned dynamic vibration absorber by tuning stiffness to reduce vibration at some troubled resonance frequencies of a simply supported beam structure is designed in this paper. Both theoretical and simulation analysis of vibration absorption are conducted. On the basis of analyzing bending vibration of the simply supported beam structure, inherent characteristics and frequency response characteristics of the simply supported beam system before and after being fixed dynamic vibration absorber are obtained by using the energy method with Rayleigh-Ritz procedure of flexible structure. Simulation model of the whole system, which is established by code written, is compared with the model established by finite element analysis software. Results are presented to show the efficiency of the vibration absorber, and then the effect of damping of the dynamic vibration absorber on vibration absorption is studied.
Infrared Electric Image Enhancement Based On Fuzzy Renyi Entropy and Quantum Genetic Algorithm
Authors: Fan Song Hai , Yang Shu Hong , He Pu , Nie Hong Yu
Published: July 2011

Infrared thermograph has been applied in electric equipment inspection widely, but the visual effects of infrared images are always undesirable. Considering the limitation of low luminance，low contrast in infrared images，an enhancement method based on fuzzy Renyi entropy and quantum genetic algorithm is presented in this paper．Firstly，the contrast-sketching function presented in [1] is improved based on the idea of segmentation. Then, in order to segment the infrared image, Renyi entropy is extend to fuzzy domain considering the fuzzy nature of infrared image, and is employed to threshold the infrared image following maximal entropy principle. In order to meet the real-time demand of online monitoring, quantum genetic algorithm is employed to search the optimal parameters of the transform function. The experimental results indicate that the method can well improve the visual effect of infrared electric images．
Effect of Austenization Temperature on the Martensitic Transformation in a Low-Alloy Ultra-High-Strength Steel
Authors: Qiao Zhi Xia , Zhang Dan Tian , Liu Yong Chang , Yan Ze Sheng
Published: July 2011

The effect of austenization treatment temperature on the martensitic transformation in the 30CrNi3MoV ultra-high-strength steel was investigated by means of dilatometric measurements and microstructural observations. The results showed that the coarsening temperature of austenite grains in the 30CrNi3MoV steel is raised to about 1000°C due to the inhibition to the migration of austenite grain boundaries, not only by the fine and disperse vanadium carbides, but also by the solute atoms adsorbed near the boundaries. The martensite obtained in 30CrNi3MoV samples with different austenization temperatures varied in the structural constituent, as well as in the size. The martensite microstructures obtained in the samples austenized at relatively low temperatures were composed of both lath martensite and acicular martensite and they are small in size. Yet the microstructures in the 30CrNi3MoV samples with relatively high austenization temperatures were occupied mostly by coarse lath martensite. For the 30CrNi3MoV steel, the austenization heating temperature should be kept below 1000°C in order to achieve the optimum mechanical property.
A Research of Trajectory Tracking of Robot Manipulator Using the Compensator of Neural Network Based on Dynamics
Authors: Yang Zhen , Wang Fang
Published: July 2011

In this paper, a new trajectory control approach of robot manipulator based on dynamics model was proposed. The method was a combination of the torque control and a compensator of neural network. The torque profile was updated by the previous torque profile. Errors were inevitable while the modeling for dynamics of robot manipulator, but they could be compensated by the compensation structure of ANN. As such, the trajectory tracking converged very fast and the new algorithm achieved the asymptotical convergence based on the Lyapunov’s method. Furthermore, it could enhance the performance of the adaptability. The result of simulations and experiments show that the controller can get the performance of trajectory well.
Study on Teaching and Scientific Research of Integration in Teachers' Team Construction
Authors: Yan Ran Ran
Published: July 2011

This study in the main object for Jiangxi blue sky institute teachers, cover English, machinery, electronics, computer four major. The basic connotation of the teaching and research integration is "teach without inquiry is shallow, inquiry and not teach is empty, teaching and scientific research, teaching research of initialization, both supplement each other, promote each other, improve together. Teaching and scientific research integration, it should make the teaching and scientific research and fusion, inseparable. Teaching and scientific research integration is not easy implementation, to really make every teacher's every day work have the research content, must ensure that teachers can with correct education theory as the guide, in view of the actual problem, in teaching and research in the process of finding appropriate medium develop education scientific research and will eventually scientific research achievements into solving teaching problem, improve teaching quality of valuable use of resources. The teaching and the scientific research integration is aimed at school this overall instead of the individual teacher, teacher team is to realize the overall objectives and teachers' personal goal of the organic combination of Bridges. Therefore, in order to promote the teaching aim of integrating scientific research, actively develop the college teachers’ team construction, to further improve the teaching quality in universities, and realize the healthy and sustainable development plays a very important and realistic significance. Therefore, this investigation focus on respectively from the Angle of teachers and students to analyze the teaching and the scientific research integration aspects, in order to get on teaching and scientific research integration teachers team construction effective approach.
Unsteady Aerodynamic Characteristics of a High Speed Train with Crosswind
Authors: Zhang Ming Lu , Yang Yi Ren , Fan Chen Guang , Lu Li
Published: July 2011

The aerodynamic performances of a high speed train will significant change under the action of the crosswind. Large eddy simulation (LES) was made to solve the flow around a simplified CRH2 high speed train with 250km/h and 350km/h under the influence of a crosswind with 28.4m/s base on the finite volume method and dynamic layering mesh method and three dimensional incompressible Navier-Stokes equations. Wind tunnel experimental method of static train with relative flowing air and dynamic mesh method of moving train were compared. The results of numerical simulation show that the flow field around train is completely different between Wind tunnel experiment and factual running. Many vortices will be produced on the leeside of the train with alternately vehicle bottom and back under the influence of a crosswind. The flow field around train is similar with different vehicle speed.
On the Application of Finite Element Method (FEM) to the Slope Stability Analyses
Authors: Xu Guo Lin , Huang Hao , Bai Ya Shuang , Zhang Wen Sheng
Published: July 2011

The finite element method (FEM) is widely adopted in the geotechnical engineering, but there exist some problems in practical applications, such as the lack of unified standard to determine parameters and the limitation of the calculation method. This article determines the reasonable value of Poisson ratio, by comparing different Poisson ratios selected in the strength reduction of FEM calculations, and improves the gravity increase method in order to enhance its accuracy in the gentle slope stability analyses.
The Study on Field Programmable Gate Array Based on PID Controllers in Real Time
Authors: He Fang
Published: July 2011

In the present work PID control and the fuzzy logic based intelligent control is used to control the rectilinear plant vibrations. PID controller in real time mode is implemented on FPGA. For implementation of fuzzy logic based intelligent controller the FPGA is used as real time data acquisition (DAQ) platform and the fuzzy controller is implemented on the host PC. The sole reason for using FPGA as data acquisition platform was that the LabVIEW FPGA software module is not supporting the complex mathematics required for the fuzzy logic control and also the rectilinear plant interface with the traditional DAQ was not available. The comparative study of performance of intelligent controllers like fuzzy PD and fuzzy PI+ fuzzy PD is done with the conventional controllers on the basis of above mentioned performance indices. The result of the fuzzy PI + fuzzy PD controller is found to be the best among all.
A Pressure Sensor with Electrical Readout Based on IL Electrofluidic Circuit
Authors: Zhao San Ping
Published: July 2011

This paper presents a novel pressure sensor based on IL electrofluidic circuit. The simple configuration makes the device capable of being seamlessly integrated to wide varieties of PDMS microfluidic devices. The experimental results demonstrate that IL-filled microfluidic channels can be utilized as electrical resistors to construct functional circuits, and an electrofluidic Wheatstone bridge circuit has been designed to construct the pressure sensor. In the pressure sensor performance characterization, the calibration results show that the gate voltage is linear proportional to the applied pressure with sensitivity of 8.45 mV/psi and the pressure as small as 2.5 psi can be easily detected.
Oscillatory Behavior in a System of Four Coupled Oscillators Model
Authors: Feng Chun Hua , Lin Yuan Hua
Published: July 2011

In this paper, we discuss a system of four coupled oscillators with delays. Some sufficient conditions to guarantee the existence of oscillations for the model are obtained. Computer simulations are provided to demonstrate the present results.
Real-Time Multitasking Video Encoding Processing System of Multicore
Authors: Zhu Li , Yang Yi Min
Published: July 2011

This paper achieved the optimize which is based on the Series processors Produced by NVIDIA, such as Geforce, Tegra, Nexus and so on, and discussed the future development of the video image processor. Expounded the most popular DSP optimization techniques and objectives in the current, to optimized the design for the methods of the various papers available in existence. Based on the NVIDIA's series of products, specific discussed CUDA GPU architecture based on NVIDIA's products, raised the hardware and algorithms of the current most popular video encoding equipment, based on real practical technology to improve the transmission and encoding of multimedia data.