bluuebunny/crossref_metadata_2025 huggingface dataset:
A Study on the Stability of Innovation Network in Tech-Typed Small and Medium-Sized Enterprises Based on Cooperative Game
Authors: Wu Cui Hua , Li Hui , Liu Ying
Published: July 2011

In the new condition of improving tech-typed small & medium-sized enterprises, it has important realistic meaning and theoretical significance how to construct a stability innovation network to ensure the enterprises innovation ability, and format and optimize innovation mechanism. In this paper, cooperative game method is used to describe and script the forming process of cooperation mechanism among network members, and its stability is analyzed and discussed. On the basis of this, it points out that only in cooperation, the stability of innovation network can be ensured, and it will make the all sides of innovation network get the largest benefits.
On-Machine Inspection Method for Superduty Lathe Based on Improved Laser Triangulation
Authors: Zhang Wei Guang , Lei Xin Ye , Zhang Fen Fen , Li Qi
Published: July 2011

In the development and application of superduty lathe process, the size measurement of a large workpiece is a key issue of quality control because the cutting process of large workpiece is high linear speed and time-consuming . A novel surface position information acquisition method for rotational object is proposed. The method uses high speed linear CCD to acquire image sequences, adopts image restoration technique to resolve clear images of laser spot from the image sequences, identifies sub-pixel center point of laser spot with correlation information among the clear frame-to-frame images, then resolves surface position information of rotational object with triangulation principle. Therefore, defects of existing laser triangulation for high-speed rotational object measurement are overcome. According to the resolved surface position information of rotational workpiece, the stability of accuracy, tool wear and vibration characteristics of superduty lathe can be evaluated.
Research for Raising Data Stability of the Digital Leather Thickness Gauge with Capacitive Sensor
Authors: Ning Duo , Wang Pan Pan , Huang Jian Bing
Published: July 2011

Low data stability exists in the measurement of the developed leather thickness gauge (MH-YD1). After studying the whole working principles and a comprehensive analysis of experimental results, we find the main factors. Which are the structural factors and the working principles of the capacitive sensor collected the displacement. Then, we put forward improvements. In hardware, we solve the effective contact between the static and dynamic film and the pivoting of the guide bar. Also including the instability of data displayed in software. Then the experimental data measured by using the improved gauge proved to have good stability.
Research of Digital Watermarking Algorithm Based on SVD and DWT
Authors: Yang Ping , Yang Liang Yu , Zhang Yu Jie
Published: July 2011

In order to protect the integrity and copyright, digital watermarking embeded secret message into the digital multi- media, which is not easy to detect the embedded watermarking, but determine the distinction using of information redundancy and randomness of digital multimedia. According to the characteristics of digital watermarking, the singular value decomposition (SVD) and discrete wavelet transform (DWT) algorithm are combined using the characteristics of SVD of image matrix and the features of multi-resolution of DWT. Therefore, a new digital watermarking algorithm of SVD is proposed in this paper. The singular values of each band of watermarking image are embedded into the coefficients of corresponding to the singular value of original image low-frequency band. The experimental results showed that the algorithm of the watermarking embedding and extraction had good robustness and effectiveness. The watermarking was robust and transparent.
Study on the Sliding Mode Control of BLDC Motor for Battery Electric Vehicle
Authors: Li Fu Jin , Li Xia , Li Cheng Qun
Published: July 2011

This paper introduces a control system of brushless direct current motor (BLDCM) for Battery Electric Vehicle. The core of the control system is the TMS320F28035 of TI Company. Hardware and control strategy were also introduced. The result of the simulation proved that it is very effective to use Sliding Mode Variable Structure as the control strategy.
Cost Forecast Model Research Based on Trend Extrapolation
Authors: Zhao Xiao , Liu Xue Feng
Published: July 2011

In order to help companies achieve the efficient and accurate forecast production costs with little human and financial resources possibly, we selected a steel factory as example, and the trend extrapolation method is used to study as the main method which belongs to time series forecasting method, the experimental results obtained good effect in practical applications, the study method is very simple and cost savings, the achievement can be used in enterprise easily.
Hardware Design and Driver Development of EPA Master Controller
Authors: Wang Ping , He Pei , Fu Wei
Published: July 2011

With the rapid development of Ethernet technology, Ethernet has become a new hotspot in the industrial control. So, the development of EPA Master Controller is a big significance for EPA Control System which based on EPA standards. EPA Master Controller is a platform that connects various protocol fieldbus modules, I/O modules and software for the upper. In the EPA system, it is a field device that consistent with EPA protocol. It communicates with upper engineer and operator stations. Also, data is transferred between field bus module, I/O module and the Controller. More, it’s responsible for signal acquisition, processing and control.
Based on the Medical Wavelet Transform Method of Eye Treatment Application
Authors: Hong Chao , Huang Xiao Hua
Published: July 2011

In this paper, a treatment used in medical image processing methods are used, in order to make the patients recover quickly, the key of technology is the use of image processing technology to track the eye center to ensure real-time measurement of wave front aberrations. A multi-scale Canny edge detector is combined with wavelet transform various methods of research, analysis, and the image signal information in the most irregular structure, or by the signal carried by transient phenomena. The dramatic changes in point is usually an important structure in the image Edge, the method aims to select the most suitable instrument for the aberration of the pupil image processing method, image smoothing and edge extraction with the dual effect.
Research on the Method to Improve the Performance of VoiceXML
Authors: Liu Wen Yun , Wang Jing Lei , Feng Xiao Na
Published: July 2011

In order to improve the efficiency of voice analysis, the authors make a series of study on the cache technologies of improving VoiceXML voice system performance, and in this paper the authors propose a new method of using sharing DOM tree to improve VoiceXML voice system performance.
Research of User Service Model Based on Cloud Computing in University Library
Authors: Feng Xiao Na , Bao Ling Yun
Published: July 2011

In order to apply Cloud Computing to university library, this paper firstly described Cloud Computing and analyzed the current status of user service models in university libraries. Then it proposes using Cloud Computing to improve the current user service model. And at last it put forward the bright prospect of user service models based on Cloud Computing.
Research on Improving Rock Slope Fuzzy-Precise Evaluation Method
Authors: Liu Jie , Li Jian Lin , Wan Liang Peng , Luo Shi Wei
Published: July 2011

The rock mass quality classification method was introduced for the strength parameters and deformation parameters when carrying out quantitative classification and provided a theoretical basis; Introducing unloading rock mechanics theory, the infiltration conditions of the surface, drainage measures , catchment area as well as the subsequent impact of buildings on the slope were considered in order to increase the coverage of evaluation factors; Considering finite element analysis results of three-dimensional model and reference targets selected , one kind of improved numerical analysis method based on fuzzy - accurate evaluation of slope stability was proposed. The method is based on finite element model of the calculation results and the appropriate references selected, having the calculation analysis of certain factors on the slope stability a quantitative treatment, thus objectively established the weight ratio between these factors, avoiding subjective awareness in expert scoring impacting evaluation results too large. With practical engineering analysis it shows: the method is directed against rock slope analysis , make more factors impacting rock slope stability involved in evaluation, and easy to operate.
A New ISAR Imaging Method of Ballistic Midcourse Target
Authors: Lei Teng , Liu Jin Mang , Wang Gang , Li Song
Published: July 2011

A new micro-motion ISAR imaging algorithm based on the MP sparse decomposition is proposed in this paper. The algorithm use the changes of azimuth angle caused by micro-motion to achieve high cross range resolution, and decompose the echoes of the same range cell before Wigner-Ville transformation to eliminate the cross-term interference. Compared with the traditional Range-Doppler algorithm and the Wigner-Ville imaging algorithm, the new algorithm considered here exhibits better imaging precision and is without cross-term interference. The simulated results have demonstrated that it is an effective method for the micro-motion target imaging.
Narrowband Emitter Identification by Exploiting Gaussian Mixture Model
Authors: Liao Yu Yu , Jia Ke Xin , He Zi Shu , Deng Song Feng
Published: July 2011

Narrowband emitter identification is used to correctly identify unknown narrowband emitters from the results of direction finding (DF). In this paper, we modeled the set of azimuth angles by a mixture of Gaussian densities, and divided narrowband emitter identification into two different stages. In the first stage, a competitive stop expectation-maximization (CSEM) algorithm was developed, which was based on Shapiro-Wilk test and minimum description length variant (MDL2) criterion. The CSEM only employed the estimated azimuth angles at all the signal-occupied frequency bins as feature parameters, while the frequency information implied in each cluster was not exploited sufficiently. So based on the implied frequency information, a postprocessing algorithm was introduced in the second stage. The experimental results show that the CSEM algorithm is more robust, and it has an increased capability to find the underlying model while maintaining a low execution time. By adopting CSEM and postprocessing algorithm in narrowband emitter identification, we are able to identify narrowband emitters with high correctness.
Vibration Isolation Failure Analysis and Dynamic Characteristic Optimization of NVD Mecha Based on ALGOR
Authors: Liu Xiang Ming , Luo Yuan Yuan
Published: July 2011

The purpose of this paper is to improve the NVD optical disk driver performance in combined sound system. Based on the optical valley of China-Wuhan R&D (research and development) red HD-NVD mecha system application, structural dynamic characteristics of the optical disk driver main parts and vibration isolation system can be analyzed by the multi-physical analysis software, ALGOR. Obtain the various modal parameters of vibration isolation system provides a solution of the unstable problem of the optical disk driver working performance which due to the low frequency vibration audio system. It is theoretically showed that the secondary vibration isolation system is feasible and laid the foundation for the optimization design of vibration isolation system.
Simulation of Goods Unloading Process Based on Queueing Network
Authors: Du Li Fang , Li Bing , Xuan Hua
Published: July 2011

This paper uses stochastic, transient networks to simulate queueing network when cargos arrive at the terminals, which can estimate the queue length distribution over the run time. Because of the transient nature of the vehicles arrival, two propositions have been used in the model. The model can derive the state of the unloading queues, which looks forwards to improving in efficiency and service level.
Dynamic Hybrid Flowshop Scheduling with Batching Production
Authors: Cao Ying , Xuan Hua , Liu Jing
Published: July 2011

Based on the background of steel-tube production, this paper presents the dynamic hybrid flowshop scheduling with batching scheduling at the first stage, and establishes an integer programming model for this problem. The objective is to minimize the total weighted completion time. The Lagrangian relaxation algorithm is constructed to slove the above model where dynamic programming is presented to solve batch-level subproblems, and a two-stage heuristic is presented to construct a feasible schedule. Testing results on small to medium problem sizes show that this method can obtain satisfactory quality solution in a shorter computation time.
Analysis and Research on Structural Dynamics of Three-Axis Flight Simulator
Authors: Liu Xiang Ming , Hu Xi Juan
Published: July 2011

This paper mainly aims at analyzing and researching on the dynamic characteristics of the three-axis flight simulator based on O-U-T type, by using multi-physical field analysis ALGOR. The paper gives out the low-order natural frequencies of three-axis simulator and its corresponding vibration modes under real load, and also presents the dynamic characteristics of harmonic response, transient response and response spectrum analysis under the influences of constraint and excitation. From the simulation results, found structure design and material property greatly affect on the dynamic performances of the simulator, confirmed the structure can meet its performance indicators and frequency response requirements. This is not only provide the evidence for structural optimization design and option evaluation of other similar simulation turntables, but also can be served as a useful reference for designing and debugging the control system of the simulators.
Hybrid Flowshop Scheduling with Finite Transportation Capacity
Authors: Xuan Hua
Published: July 2011

This paper studies a class of hybrid flowshop scheduling problem characterized by release time, transportation time and transportation capacity of one unit for each transporter. This problem is formulated as an integer programming model and a Lagrangian relaxation algorithm is designed to solve it. Testing results on problems of small to medium sizes show that the Lagrangian relaxation algorithm can obtain an acceptable near optimal schedule within a shorter CPU time.
Research on the Relationship between Controlling Shareholder and Accounting Conservatism in China
Authors: Wu Ya Ling
Published: July 2011

In this paper, we examined the relationship between controlling shareholders and accounting conservatism in China. Using 5762 firm-years data about listed firms in China stock exchanges from 2001 to 2005, we find that the percentage of the largest shareholder ownership has significantly negative effect on accounting conservatism. After controlled by size, leverage and growth opportunity, the result is still robust. We thus provide evidence of an entrenchment effect, where the largest shareholder may influence firms to adopt aggressive accounting policies that reflect the wishes of the largest shareholder rather than reflect the economic substance of the business transactions.
The Application of Self-Organizing Map (SOM) to Assess Power Communication Network Reliability
Authors: Wang Ping , Shi Ji Hong , Zhao Ling , Zong Rong
Published: July 2011

A novel method was proposed to evaluate the reliability of power communication network based on self-organizing map via analyzing the problems of current power communication network reliability evaluation. This proposed method overcomes not only the influence of subjective factors on the evaluation, but also the problem of weight. Excellent results were obtained by applying the new model to evaluating the ten communication networks. Therefore, it is proven to be objective, reasonable and effective in practice.
Numerical Simulation of Inner Flow Yield of Turbulence Generator of Papermachine Headbox and Structure Optimal Design
Authors: Hou Shun Li , Su Xiong Bo
Published: July 2011

Turbulence generator is a key part of head box of middle or high speed papermachine. It is used to make the fiber flow smooth and steady. This paper gives simulation researches of the flow status on one turbulent tube of combined-turbulence generator, result shows that there is an optimal rate between the square tube and its equivalent diameter for Round-Square turbulence generator, and the equivalent diameter is 6.5. This guides the design of turbulence generator significantly.
Research on Servo Controller for High Speed Tracking System
Authors: Li Miao , Gao Hui Bin
Published: July 2011

To meet requirement of swiftness and minimization for the tracking system as well as realize horizontal high accuracy tracking measurement, the automatic servo tracking measurement system has been designed. The two closed loop control, bisection method and compound control have been applied into the system. Experimental results show that the maximum tracking error can be limited to less than 0.5°and the regulator time can be 0.04s. The control project resonance frequency should be more than 200Hz and the sample frequency should be more than 400Hz to meet the control accuracy requirement. And these specific mechanical properties indexes are useful to mechanical working to make sure the design can be realization. So the research in this paper has important value to the engineering practice.
Computer Plotting of Quadric Surface
Authors: Wen Jing Hua , Zhang Mei , Xiao Wei
Published: July 2011

Quadric surface is an important part of complex object and free form object, showing its graphics is hot research of computer graphics and 3D data visualization. Researching quadric and deducing the process of its classification. Taking three 3D graphics commands contour3,ezmesh and ezsurf as main line, it is analyzed that 3D drawing function of Matlab7.It comes true that programming is to draw 3D graphics of all kinds of quadric, and it was compared that various graphics results, it can provide reference for computer mapping of any other surface objects.
Research on Efficient-Type Shifting Strategy of Construction Machinery with Hydro-Mechanical Transmission System
Authors: Yu Tao , Yan Qing Dong , Wei Wei
Published: July 2011

Based on the theory of hydro-mechanical transmission system, a new kind of gear shifting control scheme to improve work efficiency of hydro-mechanical transmission system was designed. By describing the work principles of crucial components mathematically, the dynamic model of hydro-mechanical transmission was constructed according to modular modeling method. The proposed efficient type shifting strategy was embedded in aforementioned model to predict its performance. The simulation results indicated the proposed strategy could improve hydro-mechanical transmission efficiency.
Surface Modification of Aramid Fiber by NaOH Solution with Different Concentrations
Authors: Qiao Kun , Zhu Bo , Yin Xiang Yu , Di Cheng Rui , Zhao Wei , Gao Xiao Dong
Published: July 2011

Aramid fiber (AF) was treated by NaOH solution of various concentrations with supersonic vibration at room temperature. The density of NaOH solution was the main parameter. Elongation at break and break strength were tested. The chemical composition of AF was characterized by elemental analysis. The surface of AF was examined by scanning electronic microscopy (SEM). It was shown that elongation at break of treated AF was not decreased, and break strength was a little increased, first increases and then decreases as the concentration of NaOH solution raising. It was also found that the surface of AF after modified was a little rougher. Low concentration of NaOH solution was fit to modify AF.
A Study on the Comparison between Different Matrixes Used for Carbon Fiber Reinforced Composite Core
Authors: Qiao Kun , Zhu Bo , Gao Xiao Dong , Di Cheng Rui , Zhao Wei , Yin Xiang Yu
Published: July 2011

The comparison between carbon fiber reinforced different matrixes composites was studied in this work. Carbon fiber reinforced phenolic resin composite and carbon fiber reinforced benzoxazine resin composite were made by pultrusion processing. Bending strength test and charpy impact strength test were taken to characterize the toughness of different composites, and scanning electronic micro-scopy(SEM) was applied to evaluate the interfacial properties between carbon fiber and different matrixes. It was shown that compared with carbon fiber reinforced phenolic composite, carbon fiber reinforced benzoxazine composite had better performance in toughness and interfacial property. Bending strength and toughness were mainly depending on the property of matrixes, interfacial property was determined by carbon fiber and matrixes.
A Study on Wear Resistance of the Ni-P-SiC Coating of Magnesium Alloy
Authors: Ge Xiao Lan , Wei Duo , Wang Cai Jun , Zeng Bing , Chen Zhi Chao
Published: July 2011

The Ni-P-SiC composite coatings with homogeneous distribution were prepared through adding nano-SiC grains into the Ni-P chemical plating liquid. The morphology of the composite coatings was analyzed by SEM. The coatings microhardnesses at the SiC composite content for different concentration were measured using the microhardness tester. The wear property of coatings was evaluated by the friction-wear tester and the abrasion mechanism of coatings was also analyzed. The results show that the microstructures of the composite coatings are superior to the common coatings because the nano-SiC particles refine the crystal grains of the composite coatings. The hardness and wear resistance of the composite plating coatings were well improved under the strengthening effect of nano-SiC grains.The wear resistance was the best when the SiC concentration was 4g/L.
Influence of Magnetron Sputtering and Annealing Treatment on the Organizational Properties of ZnO/SiO2 Composite Films
Authors: Xu Yang , Cheng Xiao Lei , Liu Zhi , Shi Huan Ru , Jian Jian Ming
Published: July 2011

ZnO/SiO2composite films were deposited on Si substrate by RF magnetron sputtering technique and annealed in air .The influence of sputtering and annealing treatment conditions on the composition,the surface morphology and the wettability of the composite films was investigated by XRD, EDS, SEM and contact angle measurement. The results show that ZnO, SiO2and Zn2SiO4 are main phases in the composite films existing by hexagonal wurtzite structure ,amorphous structure and willemite structure respectively. In this experimental conditions we get superior crystallization property of ZnO nanometer tissue with hexagonal wurtzite structure. The tissue shows bamboo leaf-like shape.The composite films has super hydrophobic,the contact angle is 146°.
Study of Tensile Properties and Fracture Mechanisms of Fully Lamellar TiAl Based Alloy
Authors: Tang Bin , Chen Chuan Jing , Xue Zhi Yong , Wu Chung Jing , Li Shuang Shou
Published: July 2011

The tensile properties and fracture mechanisms of fully lamellar TiAl based alloy was studied by room and high temperature (400°C) tensile test. The results indicated that: the crack initiated between weak lamellar interfaces．With tension increased, the cracks extended along lamellar direction. Crack propagation resistance was enhanced at colony boundary. Ligaments broke while load increased, and then the main crack and microcrack linked. The fracture process was that the main crack occurred firstly, microcrack appeared and then propagated, the main crack and microcrack were linked，and the alloy fractured finally; The ductility of the alloy at 400°C was superior to that at room temperature; The fracture mechanism of the fully lamellar TiAl based alloy is brittle cleavage fracture.
Self-Learning Control of Hydraulic Injection Molding Machine Based on Fuzzy Neural Network
Authors: Li Xiao , Yang Xiao Hua
Published: July 2011

Considering the nonlinear and time-variable characteristics of the injection cylinder system of hydraulic injection molding machine (HIMM), a self-learning control method based on fuzzy neural network is proposed in this paper. A self-learning controller was designed based on the combination of PID controller, fuzzy neural network controller, and learning mechanism. It was applied to the position control of injection cylinder. The experimental results show that the controller has the property of higher position tracking accuracy under the high speed and variable track movement of injection cylinder, compared with PID controller. The conclusion of this research can provide the beneficial reference for designing high speed and high precision HIMM.
Research of Thermal Stress Analysis on Fuze
Authors: Wang Ya Bin , Yuan Shuai
Published: July 2011

This paper describes that in high-speed flight of the projectile, temperature of fuze changes due to aerodynamic heating caused by the projectile surface layer, thus likely to impact fuze mechanical structure and internal circuit performance, even worse it can affect work of the fuze. So this paper studies the projectile surface aero-dynamic with the Supersonic flight of projectile based on Fluent software, then it can get the displacement of fuze component which caused by thermal stress using transient thermal analysis based on Ansys software. Therefore it can provide effective technical support for the design of fuze.
Design and Application of a Novel Piezoelectric Torsional Actuator
Authors: Lou Jun Qiang , Wei Yan Ding
Published: July 2011

In this paper, a piezoelectric torsional actuator generating angular displacement from piezoelectric shear strain is proposed. The procedure for the design, and manufacture of the piezoelectric torsional actuator are presented. To evaluate the performance of the proposed piezoelectric torsional actuator, the torsional vibration suppression of a flexible manipulator system with the proposed actuator is studied. The experimental results show the piezoelectric torsional actuator is capable of producing large torque and angular displacement and is suited for vibration suppression on flexible torsional manipulator system.
Research on Tool Wear Based on Texture Fractal Dimension
Authors: Chen Mao Jun , Ni Zhong Jin , Fang Liang
Published: July 2011

In automated manufacturing systems, one of the most important issues is the detection of tool wear during the machining process. The Hausdorff-Besicovitch (HB) dimension is used to analyze the feature of the surface texture of work-piece in this paper. The value of the fractal dimension of the work-piece surface texture tends to decrease with the machining process, due to the texture becoming more complex and irregular, and the tool wear is also becoming more and more serious. That can describe the inherent relationship between work-piece surface texture and tool wear. The experimental results demonstrate the probability of using the fractal dimension of work-piece surface texture to monitor the tool wear condition.
Spinel and Lanthanum Zirconate Composite for Cement Kiln
Authors: Yuan Lin , Chen Song Lin , Chen Xue Feng , Liu Xi Jun , Wang Jie Zeng , Yuan Xue Tao
Published: July 2011

Researching and developing chrome-free refractory becomes a research hotspot at present because hexavalent chromium ions (Cr6+) may lead to environmental hazard. The additives lanthanum oxide (La2O3), effect on mechanism of spinel refractory react with cement clinker, several additives, such as cerium oxide (Ce2O3), titanium dioxide (TiO2), barium oxide (BaO), iron oxide (Fe2O3), are researched in this paper. It indicates that La2O3 is a suitable additive to MgO-MgAl2O4-ZrO2 brick which not only could stabilize phase transition of dicalcium silicate (C2S) in cement, but also do not impair the high-temperature-properties of spinel. The new environmentally friendly material spinel and lanthanum zirconate Composite is an excellent refractory for cement kiln which has high thermal shock resistance, good coating adherence, good corrosion resistance, higher mechanical strength, and longer service life than magnesia-chrome brick when they are used for sintering zone in cement kiln.
Characteristics of Pressure Gradient Fluctuation for Oil-Gas-Water Three-Phase Flow Based on Flow Pattern
Authors: Wang Hai Qin , Wang Yong , Zhang Lei
Published: July 2011

Experiments were conducted in a horizontal multiphase flow test loop (50mm inner diameter, 40m long) to study the flow patterns for oil-gas-water three-phase flow and the pressure gradient fluctuation based on flow patterns. Using new methods of definition, 12 types of flow patterns were obtained and phase distribution characteristics of each pattern were analyzed. A new flow pattern (SW║IN) was firstly found in this work. Characteristics of the pressure gradient based on 7 flow patterns were carefully discussed. It was found that the pressure gradient increased with the increase of gas superficial velocity and oil-water mixture velocity. However, characteristics of the pressure gradient became complex with the increase of input water cut. The influence of flow structure of oil-water two-phase should be fully considered.
A Study of Estimating Structural Weight for Reusable Launch Vehicles
Authors: Chen Jiang Ning , Wang He Ping , Zhang Yi
Published: July 2011

This paper presents a method for estimating the vehicle structural weight in the conceptual design phases of reusable launch vehicles and analyzes the sensitivity of the multi-factors which affect the structural weight. The method is an application of liner regression analytic methods. Based on the analysis about the statistical data of the overall parameters of the vehicles, the estimating formulas of the structural weight for the vehicles are deduced using the method. By defining a sensitivity function and a sensitivity factor with dimensionless, the sensitivity of the estimating formulas to every overall parameter is analyzed. Numerical examples and the sensitivity tests indicate that those estimating formulas are available and practicable, and that wing aspect ratio, trapezoidal wing area, fuselage structural depth, vertical tail area and tail length are the most important factors that greatly affect the structural weight.
Thermodynamic Simulation and Optimum Design of Valve Train for Cam Engine with the Counter-Position Placement
Authors: Gao Sheng Yao , Wang De Shi , Zhou Qi Zheng
Published: July 2011

To control the inertial forces and moments, the new type of the reciprocating cam engine with counter-position placement has been invented. Such a thermodynamic model based on the kinematic and dynamic analysis is developed and the engine performance is simulated. Under the same structural design parameters, the counter-position placement cam engine would have the inadequate work due to the increase of throttle loss. Then effects of the gas distributions to the dynamic performance of the engine are researched. Six variables are selected to optimize maximum average indicated power and the minimum indicated specific consumption with the method of discrete variable gridding. The results indicate that: (a) The new engine structure design can present advantage of excitation forces balance. (b) The structural design parameters and the thermal efficiency of the engine should be optimized especially those of the valve actuating mechanism to achieved desired power. (c) The parameters optimized of valve train can conform to the requirements of speed and economy, and it is feasible and reasonable to put forward the scheme of cam engine with the counter-position placement.
The Simulation of Ship Oscillatory Motions in Irregular Waves
Authors: Song Yang , Lin Yan , Zhang Ming Xia , Qin Pin Le
Published: July 2011

Based on the theory of nonlinear random dynamic and ship oscillatory motions, by analyzing the spectrum of the random ocean wave and the force of the ship, the roll and pitch motion equations were erected respectively, then the irregular waves were created according to the superposition theory. Meanwhile, the coupling motion between rolling and heaving was studied, then the time-domain responses were the driving data of the motions simulation. Using VisualBasic, the interaction interface was established. Using MATLAB, the motions were solved. Using OpenGL the 3-D model of ship was described. We just need input the ship and environment parameters then the results will be displayed with the 2-D figures and the 3-D model quickly, then the visualization of ship motions simulation is achieved. The program developed can simulate 3-D ships and can be used for designers to analyze the properties of ship intuitively.
A Method to Generate Chaotic Attractors Based on FPGA
Authors: Xiang Fei , Chen Xi
Published: July 2011

This paper discusses the method to generate the chaotic attractor of the continuous system by discretizing its state equation, based on the model of Lorenz chaotic system. Utilizing the DSP_Builder and Simulink the model is constructed and simulated. Then, on the basis of the former work, experiments on the hardware platform are implemented to verify the method. The result shows that the overall design is correct and efficient.
Inventory Optimization in Supply Chains
Authors: Pan Feng Shan , Ye Chun Ming , Yang Jiao
Published: July 2011

This paper reviews joint inventory management models and discusses its contribution to improve the overall supply chain competitiveness, after discussing suppliers and agents’ plan model respectively. Further, based on the background of Company F, and combined the modern scientific management theory of supply chain inventory with practical case, it improves the inventory management method. Finally, the conclusion of calculation is presented in detail.
Design of Refractive Index Test Equipment of High Refractive Index Glass Beads by Secondary Rainbow Method
Authors: Guo Dong Hua , Ma Jun , Ma Xue Feng , Peng Lei
Published: July 2011

This paper explains the theory of the secondary rainbow and provides a test method of refractive index of the high refractive index glass beads. We carry out the optical design relate to the method, and design a refractive index test equipment. Additionally, we analyze the calibration requirements of the equipment and discuss the cause of error and measurement accuracy. The designed equipment can achieve a continuous, accurate, statistical measurement.
Research on the Key Technologies of Automatic Inspection Planning of Part Family Based on the Tabular Layouts of Article Characteristics
Authors: Zhang Yue Jin , Li Yan , Gu Qiao Xiang
Published: July 2011

Variant design is a common technology in mechanical design, but it’s inefficient to measure the variant parts using the traditional programming methods. In order to get the inspection procedures of variant parts quickly, this article puts forward a method that aims at the automatic inspection planning of customized products, which based on tabular layouts of article characteristics (TLAC). It studies the TLAC of parts which included the tolerance, the main model and its inspection template, and generation of the inspection procedures about parts. The result shows that the method can effectively improve the efficiency of inspection procedure generation.
Study on Remote Condition Monitoring Platform in Wind Energy Conversion Systems Based on AJAX Technology
Authors: Hao Wang Shen , Dong Xin Min , Han Jie , Li Ling Jun
Published: July 2011

There is a constant need for the reduction of operational and maintenance costs of Wind Energy Conversion System (WECS). The most efficient way of reducing these costs would be to continuously monitor the condition of these systems, which allows for early detection of the degeneration of the generator health, facilitating a proactive response, minimizing downtime, and maximizing productivity. Wind generators are also inaccessible since they are situated on extremely high towers, which are usually 70m more in height. There are also plans to increase the number of offshore sites increasing the need for a remote means of WECS monitoring that overcomes some of the difficulties of accessibility problems. Therefore it is important of condition monitoring and fault diagnosis in WECS. A monitoring scheme of transfer its monitor status with AJAX technology was put forwords in this paper. A remote condition monitoring platform (RCMP) was designed and constructed in this project. And its result brings us an effective solution to deal with the WECS condition monitoring.
The Analysis of Dynamic Characteristics for Long Annular Rack Pumping Unit
Authors: Gao Lei Lei , Gu Xin Yi , Zhao Yong Gang , Liu Yong Hai
Published: July 2011

Long annular rack pumping unit is a new styles of pumping unit invented by Gu Xinyi academician. It has some advantages including energy conservation and high reliability. In order to understand the dynamics of the new pumping units, the virtual prototyping model of this pumping unit is build. The kinematics and dynamics characteristics of this unit are researched and simulated. The results can be a guidance for the design and practical application.
A Low-Cycle Fatigue Design Combined Finite Element Analysis about Pressure Vessels
Authors: Lu Zhi Min , Wang Lin Lin , Chen Wei Feng , Zhang Lin
Published: July 2011

The study of Low-Cycle fatigue showed that strain is more important parameter than stress for describing fatigue property of materials .Exactly obtaining regional strain of the structure by analysis is key in fatigue design of complex structure .Therefore, the analysis and solution by finite element is very necessary. The maximum elastic and plastic strain at the nozzle junction of a pressure vessel under several loadings are calculated by using ANSYS software .Then crack forming life is calculated by using the N.E.Dowling formula .
Fabrication and Mechanical Properties of Alumina—CNTs Composites
Authors: Zhao Jing Song , Feng Yi , Chen Nan Nan , Chen Fan Yan , Chen Jie , Zhang Xue Bin , Pan Xiao Bing , Tu Jing , Ouyang Xiao Ping
Published: July 2011

The transmutation target of nuclear waste material has been fabrication by a powder metallurgy method by using Alumina as the matrix and CNTs as reinforcement. The effect of different nanotube contents on the fracture toughness and the bending strength was investigation. The results showed the fracture toughness and the bending strength of composites increased with increasing CNTs mass fraction when the content of CNTs was less than 1.5%. However, when the contents of CNTs greater than 1.5%, the fracture toughness and the bending strength of composites decreased as the content of CNTs increased. Possible mechanisms are discussed in detail in the paper.
Tailoring of Composite Reinforcements for Weight Reduction of Offshore Production Risers
Authors: Wang Chun Guang , Shankar Krishna , Morozov Evgeny V.
Published: July 2011

The use of composite materials in offshore engineering for deep sea oil production riser systems would lead to weight savings and improvement in fatigue and corrosion resistance. This paper examines the weight saving potentials offered by varying fibre orientations, stacking sequences, fibre matrix combinations and liner materials for deep sea riser tubulars. Four main load cases, recommended by design standards for the local design of composite offshore risers, are considered in the analysis using three-dimensional finite element modelling: maximum internal pressure, axial tension, top tension with external pressure and maximum external pressure.
Optimization of Stope Structure Parameters in E’xi Iron Mine Based on Rock Stress Analysis
Authors: Liu Yan Zhang , Wang Qi Hu , Ye Yi Cheng , Sheng Jian Long
Published: July 2011

Underground mining causes the redistribution of surrounding rock stress. The value of rock stress is one of the important factors that should be considered when stope structure size is designed. E’xi iron ore body is gently declined in attitude, thin in thickness, and large in occurrence area. According to mining technological conditions and the selected mining method of E’xi iron mine, a typical section of the mine is selected, and it is abstracted into a plane strain problem. In terms of optional stope structure parameters, 9 calculation schemes are planed. Rock stress distributions of stope caused by mining are simulated by the Finite Element Method. Rational stope parameters are chosen by comparing stress distributions of all calculation schemes. Analysis result shows that 8m net distance between pillars, and 4m pillar width are the optimum stope parameters, which not only stabilize the stope but also improve mining efficiency. Choosing stope parameters based on rock stress distributions calculated with numerical simulations, is provided a scientific analysis method for determining rational mining parameters of underground mines.
Research on Preparation of W-Cu Nano Composition Powder by Precipitation Method
Authors: Chen Hao , Yuan De Lin , Liu Li Ya , Du Wen Qiang
Published: July 2011

W-Cu precursor was prepared by chemical precipitation. Then the superfine W-Cu composite powder was prepared by roasting and hydrogen reduction process. The composite powder sample were characterized by SEM and XRD. The experimental results show that component uniform and stabilising ratio W-Cu precursor can be prepared by controlling pH of solution, then W-20%Cu uhrafine composite powder was prepared by hydrogen reduction proces ,The sizes of three compositions in the powder(Cu0.4W0.6, W and Cu)was to nanometer, in which the size of Cu0.4W0.6 and W was 40nm while the size of Cu was 70nm.
Effect of Sliding Speed on Wear Property of MoSi2 at High Temperature
Authors: Zhang Hou An , Gu Si Yong
Published: July 2011

Wear behaviors of MoSi2against Al2O3or SiC under 30N at 1000°C in air have been investigated by using an XP-5 type High Temperature Friction and Wear Tester. The worn surfaces and phases of samples were characterized by scanning electron microscope (SEM) and X-ray diffractometer, respectively. Result shows the wear rate and friction coefficient of MoSi2decreases with the increase of sliding speed. SiC is superior to Al2O3as the counter-face materials of MoSi2. Serious adhesion leads to very high wear rate of Al2O3in this experiment. SiC shows a surprising mass weighing phenomenon, which is caused by oxidation. The main wear mechanism of MoSi2against Al2O3is oxidation and adhesion. However when against SiC, it is chiefly controlled by grinding.
Finite Element Modeling for High Speed Machining of Ti-6Al-4V Using ALE Boundary Technology
Authors: Lu Dong , Yang Ming Ming , Huang Hong Fu , Zhong Xiao Hong
Published: July 2011

A finite element model of HSM (High Speed Machining) process of Ti6Al4V was developed with Abaqus 6.10. The flow stress of Ti6Al4V is taken as a function of strain, strain rate and temperature. Considering the fact that the tool edge radius is relatively large in HSM of Ti6Al4V and significantly influences the mechanical behaviour, thus a new Arbitrary Lagrangian-Eulerian (ALE) boundary technology was incorporated into the finite element model to simulate the flowing material around the tool edge.The adoption of ALE boundary technology could avoid using the traditional chip separation criterias and element deletion method in the model, which at the same time results in the less excessive element distortion and computational time in comparison with traditional finite element models of cutting process. The simulation results of Cutting force and temperature close to the experimental values in an acceptable range could be obtained and a stagnant zone in front of the tool edge was successfully observed in this new developed model with large tool edge radius.
Microstructure Evolution of 1235 Aluminum Alloy after Hot Compression Deformation
Authors: Yan Wen Duan , Fu Gao Sheng , Chen Hong Ling , Chen Gui Qing , Ma Bin
Published: July 2011

Microstructure evolution behavior of 1235 aluminum alloy under different deformation conditions was studied by hot compression simulation, along with OM, TEM. The law of microstructure evolution at hot deformation was also analyzed. The results showed that the dynamic recrystallization behavior of 1235 aluminum alloy was obvious during hot deformation. At higher deformation temperature or lower strain rate, the grain dislocation density was lower and grain boundaries tended to be straighter, therefore, the grains dynamic recrystallized more adequately. The recrystal grains were smaller and distributed uniformly at deformation temperature for 400°C and stress rate for 0.1s-1 with the average grain size for 54.03μm.
Reference Points Recognition in Fabric Drape Measurement Using Affine Moment Invariants and Kernel Fisher Linear Discriminant
Authors: Liu Hao , Wang Yu Xiu , Li Xiao Jiu , Qiu Guan Xiong
Published: July 2011

In this paper, Kernel Fisher discriminant analysis and affine moment invariants are presented for recognizing the reference points on fabric surface. The planar images and spatial images of reference points that are indexed and attached on fabric are acquired by camera at different angle and focus, subsequently, the binary image of reference points are extracted by a series of algorithms such as filter, enhancement and binaryzation etc. Experimental result shows Kernel Fisher discriminant analysis has the better recognition ratio than routine nearest distance discriminant method. Correction recognition of reference points is the important step for the matching of multi-images and reconstruction of fabric surface morphology which provide the more information for fabric drape performance evaluation.
Compositional Optimum Design of the Ceramic Composite with Immune Genetic Algorithm
Authors: Zhang Hui Fa , Xu Chong Hai , Wang Xing Hai , Zhang Jing Jie
Published: July 2011

In this paper, the immune genetic algorithm (IGA) is used to optimize the compositions of the Al2O3/SiC/Ti(C,N) ceramic composite material. Corresponding to the optimal mechanical properties such as fracture toughness, hardness and flexural strength, the optimum material compositions have been achieved. The convergent speed of IGA is faster than that of the single immune algorithm, and the number of iteration is also reduced obviously. As a result, the efficiency of optimization is increased.
Thickness Effects on the Fatigue Crack Growth Rate of 2024-T4 Aluminum Alloy
Authors: Xu Feng , Wang Xiao Gui , Yang Guang , Gao Zeng Liang
Published: July 2011

The fatigue crack growth experiments of 2024-T4 aluminum alloy were carried out to study the thickness effects on the fatigue crack growth rate. Round compact specimens with two different thickness, 3.8mm and 12.5mm, were subjected to Mode I loading with fourR-ratios (0.05, 0.1, 0.5 and 0.75) and loading amplitudes. An optical reading microscope with a magnification of 40 was used to measure the crack length. Stable crack growth is characterized by the standard form of the Paris law, material constants of the Paris law corresponding to eachR-ratio were obtained by fitting the experimental data. The fatigue crack growth rate of specimens with a thickness of 12.5mm is apparently higher than that of specimens with a thickness of 3.8mm whenR-ratio is equal to 0.1, 0.5 and 0.75. While the effect of thickness is relatively less significant for the case of. It can be concluded that the fatigue crack growth rate increases with R-ratio or thickness when one of them is identical.