bluuebunny/crossref_metadata_2025 huggingface dataset:
Discontinuity and Convergency of Solutions for a Class of Linear Singular Switched Systems with Time Delay
Authors: Xie Xiang Sheng , Chen Jun Hong , Jia Gong Xiang
Published: May 2011

At a switching point, the inconsistency can exist between subsystems switched before and after the point, resulting in the solutions of singular switched system with time delay there may be discontinuity. We consider the discontinuity of the solutions for a class of switched linear singular systems with time delay and the convergence of discontinuous solutions. Using Lyapunov-Krasovskii function and the LMI method, we establish some criteria to guarantee all solutions of the systems converge to zero. The criteria are expressed as LMI form and depended time delay. An example is given to illustrate the application of the presented results.
Development of Product Options for Modular Product Development
Authors: Kong Fan Bin , Ming Xin Guo , Wang Lei , Zuo Huai Liang
Published: May 2011

Modular product development plays an important role in helping manufacturing companies provide product variety rapidly in achieving competitive advantages. The development of product options plays a significant role by providing a selecting list for customizing, and has a key impact on the development of modular products. A process for product options development has been developed to guide the activities of determining product options and their values. And mathematical models have been brought forward to support decision-makings within the proposed process. A prototype system based on this process and mathematical models has been developed and tested in a machine manufacture plant, with satisfactory results.
RFID Enabled Signal Priority Strategies for Bus Operations
Authors: Wang Hao , Cheu Ruey , Lee Der Horng
Published: May 2011

This paper involves a study of signal priority strategies for bus operations using Radio Frequency Identification (RFID) technology enabled devices. An actual suburban network of the Clementi area of Singapore, which including several signalized intersections, was used for microscopic traffic simulations conducted in this study. Based on the experimental results, the proposed system has the potential to improve public bus service level by reducing congestion of bus traffic flow through street intersections.
Parametric Modeling Based on Orthogonal Milling Process
Authors: Sheng Jing
Published: May 2011

The finite element analysis (FEM) of metal machining is a complex process. It is essential to exploit a system to construct a model of FEM so as to obtain simulation data more conveniently and rapidly. The key techniques of two-dimensional modeling in MSC.Marc software and the whole modeling procedure of metal orthogonal cutting process were presented. The rule based on the modeling process was also investigated. The system’s interface, designed using C++ Builder, can access data which includes the geometrical angles and dimensions of tool, the sizes of work, the relative position between tool and work, properties of tool and work, cutting conditions, etc.. The procedure file which can model in MSC.Marc environment automatically is generated by the program. The parametrical modeling of simulation is completed by the procedure file. Finally, case studies were performed to study the simulation model, interface and simulation.
A Study on the Design of Compound Die with Constant Blank Holder Pressure
Authors: Yang Zhan Yao , Fan Guo Quan
Published: May 2011

This paper introduces blanking, drawing and compound die of the cylindrical parts. The compound die applies the special structure to maintain a constant blank holder pressure, which is not increased by drawing. It reduces the processes and improves the efficiency of production.
SpaceWire State Machine Verification Based on Model Checking
Authors: Dai Zhi Quan , Guan Yong , Jin Sheng Zhen , Shi Zhi Ping , Li Xiao Juan , Zhang Jie
Published: May 2011

SpaceWire is a high-speed data transmission bus standard proposed by ESA for the aerospace applications. Hosted by the National Astronomical Observatories, Chinese Academy of Sciences, the Space Solar Telescope project takes the SpaceWire bus standard as space communication link. The SpaceWire communication circuit implemented by our group is a part of the SST project. In order to improve the fault detection and fault correction capacity and the reliability of the SpaceWire bus, we add a more error analysis and data storage module into the original six state modules of the standard protocol in the exchange layer.We adopt the formal verification method based on the model checking to verify the finite state machine of the SpaceWire control module. The properties expressed by the high-order temporal logic formula are verified automatically to be true by the SMV model verifier of the Cadence Company. Verification results show that our SpaceWire bus implementation and the additional error analysis and data storage module are faithful to the protocol specification. Therefore, we also can integrate SpaceWire bus circuit into the SST project.
An Introduction to the New Kind Hydraulic Motor - Development and History
Authors: Liu Hu Ran
Published: May 2011

Hydraulic motor with swinging bevel gear is a new kind of hydraulic motor. There are many advantages of it over other kind hydraulic motor. The decelerating ratio is big, moment work ratio is high, energy consuming is low, and decelerating function is good. Compared with other general liquid presses motor, this type of motor has the all new construction with the function, being applicable to the low turning the soon big turning the moment specially, high- efficiency realm. A principle for studying this kind of new motor with realize technique, include go together with to flow to convert the technique, adjust soon principle with method, the wheel gear theories matches the function with many cogwheels engaged, whole machine is excellent to turn the design, the kind machine manufactures experiment etc. with function on a trial basis to.The item's research for the country inside blank, spread to move to the host simplification, economize the energy, decline the low cost having got the important meaning.
The Force Analysis of the Planet Swinging Bevel Gear and Skew Shaft
Authors: Liu Hu Ran
Published: May 2011

A new kind of hydraulic motor suitable for the low velocity, large torque, high efficiency and mutable velocity output have been researched and developed in this paper. There are a series of creations and in advantage, such as, the oil flow distribution, the principle of reducer, the output mechanics and the total structure. It features in the simple in construction, small of size, large ratio of reducer, high f ratio of torque-power, and low in energy consumption. It is suitable for all the occasions with hydraulic supply and all the fields when low velocity, large torque, high efficiency and mutable velocity output ware needed. Such as the construction mechanics, ship mechanics, heavy machine tool, heavy capstan and so on. The frequency of the hydraulic system is about 1000—2000/min, the reduced ratio of the planetary drive of swinging bevel gear is about 20-100, with 150 the maximum. This paper introduced the fundamental principle of the transmission of this mechanics, designed the basic structure of this mechanics, and analyzed the movement and forces.
Development of Parametric CAD System Based on Pro / Toolkit and Database Technology
Authors: Zhou Hui Lan
Published: May 2011

With Pro/Toolkit of Pro/E and ADO(ActiveX Data Object) database technology, part parametric CAD system is developed and an successful instance is introduced in the paper. In the CAD system, interface between Pro/E and VC++6.0 is created correctly using Pro / Toolkit and user interface for part parametric designing can be achieved by means of dll( dll dynamic link) library built in VC++6.0 .Meanwhile ADO database is applied in the CAD system to manage all part parameters and thus part revising and updating can be realized quickly. The developing method in the CAD system not only is applicable to typical mechanical part designing but also be helpful to establishing standard part library.
A Study on Tensile Deformation Features of Ni-Based Super-Alloy Prepared by EB-PVD
Authors: Ma Li , Zhang Ting , Li Xiao , Hu Zhao Hui
Published: May 2011

Large-scale Ni-based super-alloy sheet has been prepared by electron beam physical vapor deposition (EB-PVD). Microstructure and the dislocation structures in the γ-γ′ double phase alloy under different temperature after tensile strain are studied with Transmission electron microscopy (TEM). The results show that the dislocation glide in single slip system and shearing mechanics, the dislocation climb with part shearing, absolute dislocation climb and cross slip, dislocation round are a course of the interacting degree between dislocation and γ′ phase gradually weakened under the tensile temperature from room temperature to high temperature, so as to decrease materials strength and increase plasticity.
Tensile Creep Damage and Rupture of Al2O3-SiO2(sf)/AZ91 Composite
Authors: Tian Jun , Zhong Shou Yan
Published: May 2011

Constant stress tensile creep tests were conducted on an AZ 91–25 vol.% Al2O3-SiO2 short fiber composite and on an unreinforced AZ 91 matrix alloy. The creep resistance of the reinforced material is shown to be considerably improved compared with the matrix alloy. The creep strengthening arises mainly from the effective load transfer between plastic flow in the matrix and the fibers. Microstructural investigations by SEM revealed good fiber–matrix interface bonding during creep exposure. Short fibers have a great function in load bearing and load transfer, and greatly hinder the dislocation movement, thus enhancing the creep resistance of the composite. Damage and multiple rupture of aluminum silicate short fiber, quality of the interface combination between aluminum silicate short fiber reinforcement and the matrix, are two important factors of the creep deformation microstructure process control of Al2O3-SiO2(sf)/AZ91 composite. The creep mechanism of the composite is dislocation and grain boundary sliding control.
Development of Web-Based Partner Alliance Management Platform
Authors: Wang Yong Ming , Han Fei , Yu Jin Zhong
Published: May 2011

Along with the rapid development of network information technology, e-commerce is playing an important role, and it is urgent for small and medium-sized enterprises to participate in enterprise dynamic alliance. By using ASP.NET technology, this paper developed a web-based partner alliance management platform, and introduced its architecture and main functional modules. Some key technologies of this platform were discussed, including platform role description and use case analysis, partner evaluation and selection method, network security techniques of this platform and so on. Finally, an applied case of partner alliance management platform is given, which is beneficial to attract small and medium-sized enterprises to take part in enterprise dynamic alliance, thus can realize sharing and integration of resources information among them and improve their competitiveness.
Use of Municipal Sludge with Soil on Marigold Flower Growth in Pot Experiments: Case Study of Vientiane City, Lao P.D.R
Authors: Thammathevo Khampasith , Bao Jian Guo , Mupenzi Jean de la Paix , Singsuaisagna Bounthanome
Published: May 2011

This paper presents the results of the study taken in ThaDua Wastewater Treatment Plant of Vientiane city to investigate the Use of municipal sludge with soil on Marigold flower growth in pot experiments. Sludge samples from the rice farm were examined periodically during the period from February to June 2010 using the chemical analytical method for soil, Organic matter (OM) was measured with volumetric analysis using Walkley and black method. The pH value was measured in a 1:1 (w/v), using pH meter. The plant was grown for 75 days, approximately 2.5 months (between April and June 2010). The bacteriological and chemical characteristics of the sludge after centrifuging were measured in order to establish the possibility of land disposal. And the Results for Marigold flowers as the chosen for the experiment, were that all mixtures of castings (C) with PP, PBS, except 3 PP: 1 C (v/v), increased the growth index of plants.
Removal of Cu2+ in Aqueous Solutions Using Sludge Incineration Slag as an Adsorbent
Authors: Liu Jing Yong , Sun Shui Yu , Zhang Rong Xue , Zhong Sheng , Chen Min Ting
Published: May 2011

Sewage sludge incineration slag, the waste generated in sewage sludge incineration, was obtained from a sewage treatment plant in Guangzhou and used as a low-cost sorbent for removing Cu(Ⅱ) from wastewaters. The adsorption effectiveness and their factors of Cu2+ in aqueous solutions were simulated detailed using the adsorbents of the sludge incineration slag. The simulation contents and the factors included the adsorption time, the pH of solution and the dosage of adsorbents and so on. The results showed that at 30 °C, the adsorption equilibrium of Cu2+ can be achieved in 6h and the best pH value of the solution was about 4.5-5.5. The removal rates of Cu2+ were increased with the adsorbent concentration increasing and the optimal concentration of adsorbent was 20-30g/L with the initial concentration of Cu2+ less than 25mg/L.At the best adsorption conditions, the removal rate of Cu2+ reached more than 80% and the adsorption capacity was 0.83-1.25mg/g.
The Synthesis of High Yield Diglycerin Borate
Authors: Wang Qi , Zheng Guo , Ai Jian Jie , Wei Xue Jing
Published: May 2011

High yield diglycerin borate(DGB) have been synthesized by the raw materials glycerol and boric acid in this paper. The structure of the products was characterized by FTIR and 11B NMR. The yield of the products was discussed by reaction conditions that were material ratio, reaction temperature, reaction pressure etc. and then the optimum process conditions of preparing DGB was decided. In this condition, high yield DGB can be prepared which could reach more than 96%.
Aircraft Cable Fault Location Based on Detection Model
Authors: Liu Xiao Lin , Li Zhi Quan
Published: May 2011

An aircraft cable fault location method based on detection model is proposed to solve the problem of being difficult to inspect the fault for the civil aviation maintenance. In response to the condition of the experimental installation, the reference signal is designed. The fault of the cable can be located according to the reflected waveform. An aircraft cable fault location system is designed and the experimental results show that the method is rational and effective.
Effect of Pressure on Microstructure and Properties of High Silicon Electrical Steel by EB-PVD
Authors: Li Xiao , Lou Bai Yang , Wu Hua Ping , He Xiao Dong , Sun Yue
Published: May 2011

The effect of pressures on microstructure and properties of as-deposited high silicon electrical steel by EB-PVD during hot pressing was studied. X-ray diffraction (XRD) and scanning electron microscopy (SEM) were used to characterize the phase composition and morphology; the density and electrical resistivity were measured using the bottle method and four-probing method, respectively. It was found that the density increased from 7.25×103 kg/m3 to 7.5 ×103 kg/m3, while the electrical resistivity decreased from 85µΩ•cm to 75µΩ•cm with the increase of the pressure from 30 MPa to 60 MPa.
Phase Composition and Magnetic Structure of High Silicon Electrical Steel by EB-PVD
Authors: Li Xiao , Lou Bai Yang , He Xiao Dong , Ma Li
Published: May 2011

High silicon electrical steel prepared by EB-PVD was subjected to high temperature rapid thermal annealing and subsequent pack rolling. The phase composition and Fe configurations were characterized by X-ray diffraction and Mössbauer spectroscopy. The results show that the as-deposited, as-annealed and as-rolled samples mainly consist of DO3 ordering phase and the as-deposited electrical steel is composed of six kinds of Fe sites corresponding to 333.8KOe, 319KOe, 302 KOe, 284 KOe, 249 KOe, 196 KOe, respectively, while the Fe site corresponding to 196 KOe hasn’t been found in the other two samples. Moreover, the other two samples show a larger Fe site occupancy corresponding to 284 KOe.
Research on Materialized View Selection in the Data Warehouse
Authors: Zhou Li Juan , Geng Hai Jun , Xu Ming Sheng
Published: May 2011

Materialized view is an effective method for improving the efficiency of queries in data warehouse system, and the problem of materialized view selection is one of the most important decisions. In this paper, an algorithm was proposed to select a set of materialized views under maintenance cost constraints for the purpose of minimizing the total query processing cost; the algorithm adopts the dynamic penalty function to solve the resource constraints view selection. The experimental study shows that the algorithm has better solutions and high efficiency.
Total Object Unified Model Driven Architecture Method for Manufacturing Information Management
Authors: Zhang Su Mei
Published: May 2011

The purpose of this study was to provide a unified modelling framework of Product Lifecycle Management (PLM). Firstly, the paper presented a Total Object Unified Model(TOUM) method which was used to abstract the concepts of manufacturing domain, format the meta-model of manufacturing data, construct the data model of PLM; Secondly, this paper presented three kinds of architectures based on TOUM to unify and simplify model, which are development architecture, deployment architecture and application architecture. At last, a model instance applied in a PLM product-CAXA V5 was shown based on the method of TOUM to confirm the validity of this method. This paper has provided a reference operation model and method for Product Lifecycle Management.
The Dependence of Corrosion Resistance of Ni-Cr-Mo-Cu Alloy to NaOH Solution on 4Cr/ (2Mo+Cu)
Authors: Pan Li Hua , Yang Rui Cheng
Published: May 2011

The kinetics of the corrosion procession of Ni-Cr-Mo-Cu alloys designed by the formula APF=4Cr/ (2Mo+Cu) in NaOH solution have been investigated at the concentration range from 0.0025mol/cm3 to 0.015mol/cm3 and 20°C. It were developed that the kinetic parameters depend on the APF. It is discussed that the dependence of the corrosion resistance to NaOH solution on the APF.
Design of a Dc Motor Soft Start Based on AVR Microcontroller
Authors: Zhang Li Xiao , Luo De Lin , Su Long Jiang , Cao Da , Luo Zhi Feng
Published: May 2011

DC motors are important industrial products. Directly starting a DC motor will harm the motor and the dragged equipment. This article has designed a DC motor control equipment of soft starting, stopping and many protections functions resting on the DC motor control principle and PWM technology. The advantages of this equipment are starting the DC motor continuously and smoothly, low impact torque and impact current, easily controlled, good repeatability, and small volume.
Development of Visual Attention Measurement System of Simulated Traffic Environment
Authors: Xia Ru Ting , Fan Jian , Zhan Bai Shao , Doi Shun’ichi
Published: May 2011

This paper introduces the designs on visual attention measurement system based on the visual attention theory. The measurement system simulated the traffic environment and driving conditions, to examine the reaction time and accuracy of judge response of drivers. It applies to research the top-down and bottom-up controls of visual attention in three-dimensional (3D) space. It included the setting of observation location, stimuli location, moving speed, environmental illuminance and the design of software control interface. The paper describe how the stimuli can be presented by the control system and introduce the design of variable periphery environmental illuminance and obversion targets for detect tasks in detail. The results are demonstrated that this measurement system can be used to examine the reaction time and accuracy of judgment response in three environmental illuminance conditions.
End Effect Processing for Empirical Mode Decomposition Using Fuzzy Inductive Reasoning
Authors: Yuan Ye , Yang Zhong Kai , Li Qing Fu
Published: May 2011

This paper focuses on the end effect problem of the empirical mode decomposition (EMD) algorithm, which results in a serious distortion in the EMD sifting process. A new method based on fuzzy inductive reasoning (FIR) is proposed to overcome the end effect. Fuzzy inductive reasoning method has simple inferring rules and strong predictive capability. The fuzzy inductive reasoning based method uses the sequence near the end as the input signal of fuzzy inductive reasoning model. This predictive value can be obtained after fuzzification, qualitative modeling ,qualitative simulation and debluring. The simulation results have shown that the fuzzy inductive reasoning based method has equivalent performance to the neural network based method.
Modeling Wood Density of Larch by Near-Infrared Spectrometry and Support Vector Machine
Authors: Zhang Ya Zhao , Li Yao Xiang , Zhang Hong Fu , Zhang Hui Juan , Li Pai
Published: May 2011

Model for predicting wood density of Larch was established using near-infrared spectroscopy (NIR) combined with support vector machine (SVM). A hundred and seventeen Larch samples were used in the study. Wood density of samples was measured according to standard test methods for physical and mechanical properties of wood. Support vector machines for regression (SVR) was used for model building. Radial basis function (RBF) was used as kernel function to establish a model for predicting wood density. For the train set, the coefficient of determination (R2) and the mean square error (MSE) were 0.8504 and 0.6460×10-3, while the R2 and MSE was 0.8520 and 0.4451×10-3, respectively, for the test set. Results showed that using SVM in near-infrared spectroscopy calibration could significantly improve the model performance in order to rapidly and accurately predict wood density.
Mechanical Properties of UP Resin from Soybean Oil
Authors: Li Jian , Qin Yan , Zhao Liang
Published: May 2011

In this paper, a kind of unsaturated polyester resin (UPR) was prepared by using renewable soybean oil, glycerol, propylene glycol and anhydride as raw materials. In this process, soybean oil firstly reacted with glycerol to yield monoglyceride, then, propylene glycol partly replaced by monoglyceride reacted with anhydride to yield UPR. The effect of weight content of monoglyceride on the mechanical properties of UPR was systematically studied. Results showed that with the increase of weight content of monoglyceride, the curing exothermic peak of UPR was dropped; the curing shrinkage and flexural strength and tensile strength were decreased. But the impact strength and the tensile elongation were increased. When the weight content of monoglyceride was 40%, the impact strength and the tensile elongation could reach 102.074 kJ/m2 and 27.69%, respectively. The prepared UPR had some advantages such as low-cost, flexible and high production efficiency.
Engineering Graphic Transition in Third-Angle and First-Angle Projection
Authors: Yang Chun Jie
Published: May 2011

This paper focuses on the transition methods and skills of engineering graphic in third-angle projection and first-angle projection. According to the Chinese National Standard of Technical Drawings, the first-angle projection is used to make engineering drawings while in some other countries, such as in the USA and Canada, the third-angle projection is used. The transition methods are widely applied to the engineering graphics field in the world.
DFT-Based on Mahalanobis Distance Discriminant Analysis Method Channel Estimation Algorithm for OFDM Systems
Authors: Fan Tong Liang , Deng Min Jun , Huang Hong Cheng
Published: May 2011

An enhanced discrete Fourier transform DFT-based channel estimation for OFDM systems is proposed. Conventional DFT-based channel estimations improve the performance by suppressing time domain noise. However, they potentially require information on channel impulse responses and may also result in mean-square error (MSE) floor due to incorrect channel information such as channel delay spread. In order to overcome the disadvantage, our proposed channel estimation can improve the performance by deciding significant channel taps adaptively. Significant channel taps are detected on the basis of Mahalanobis distance discriminant analysis. Simulation results demonstrate that the proposed algorithm outperforms the conventional DFT-based estimation in terms of BER and MSE performance.
Manufacture of Micro Gear Shaft Based on Micro Hobbing Technology
Authors: Shi Wen Tian , Liu Yu De , Ding Yue , Han Bao An
Published: May 2011

Micro hobbing technology is an extension of traditional technology in small scale for processing micro gear. The micro gear shaft which module is 0.175mm is processed by micro hobbing technology. The tooth profile of the micro gear shaft is perfect and the tooth is divided evenly, the burr of the edge is small and the surface roughness is high enough to achieve the requirements of the micro gear shaft. In paper, the design of micro gear hob and the micro hobbing technology is the key factor to the manufacture of micro gear and is presented detailed. The result shows micro hobbing is a good way to process micro gear and it has some advantages including the high efficiency, accuracy in tooth profile, lower cost and widely range of suitable materials. micro-hobbing technology has significance value to research and can be applied in manufacturing the micro gear.
Investigation of Shear and Thermal Characteristics of Polishing Interface in Soft Pad Polishing Process
Authors: Tsai Hung Jung , Huang Pay Yau , Tsai Ming Yi , Tsai Hung Cheng , Lin Cin Jhe
Published: May 2011

In the current study, a high precision polishing process test bench with in-situ measurement technology was developed. The test bench also adopted to investigate the effects of operating parameters on polishing interfacial phenomena during the polishing process with IC1000 pad. The experimental results coincide with the experimental and theoretical data published previously results. The developed test rig and the current experimental outcomes contribute to the understanding of soft pad polishing mechanism.
Research of a Novel Bi-Directional Flexible Load for Electric Vehicle Test Bench
Authors: Liu Jun , Wang Li Fang
Published: May 2011

The devious but steady increase in the price of petroleum along with concerns about emissions of greenhouse gases, presents renewable energy sources as promising solutions. So, either enterprises or research institutions zealously take part in new energy automobile development for more and more serious energy and environment problems. Whatever, variable and dynamic loads are required in order to satisfying variable working conditions in the electric vehicle (EV) experiments of the traffic. The scheme of power electronic impendence converter which adopts bi-direction DC-DC topology base on ultra-capacitor (UC) is brought forward to satisfy bi-direction power train in experiments. When UC is charged, the system is look upon as positive load. On the other hand, if UC is discharged, the system is look upon as negative load. Impendence converting can be implemented by controlling converter’s duty cycle and operating condition. Then, the load torque is simulated by changing the variable load’s value. At last, the experiments show that the scheme is feasible and cost-efficiency.
Research of a Full-State Fuel Cell Power Electronic Simulator
Authors: Liu Jun , Wang Li Fang
Published: May 2011

Proton Exchange Membrane Fuel Cell (PEMFC) has being widely applied in electric vehicle and distributed generation for its low corrosion, low-temperature operation and environment friendship. It should be concerned over the control and maintenance of its auxiliary equipments, placement site, restoring of hydrogen and other things when physical PEMFC is used. However, PEMFC’s volt-ampere (V-I) external characteristics draw our more attention rather than its ontology or peripheral devices control which keeps PEMFC working properly in many appliance studies. So, there is another solution to introduce power electronic technique to construct a FC power electronic simulator which simulates FC’s external characteristic including static and dynamic states and keeps away those troubles mentioned above. A buck converter is adopted to construct the FC simulator. The test DC current source load is acquired by a buck converter which main circuit is similar to the FC simulator. The experiments show the FC simulator has done a good job to simulator FC’s volt-ampere external characteristic and it is cost saved.
Obstacle Avoidance System Based on Single Rotary Ultrasonic Sensor
Authors: Cui Guang Zhao , Wei Wen Juan , Guo Jin Chao
Published: May 2011

Centering round obstacle avoidance problem, an evadible system based on the ultrasonic sensor Sens600 is presented in this paper, the sensor rotated by the stepper motor scans back and forth in horizontal plane ahead of the robot, then the system builds and updates a histogram world model with the to-and-fro range information after data processing, the safe area capture (SAC) method is applied to compute the most suitable direction among all candidates, and the steering of the robot is aligned with that direction. The experimental results demonstrate the feasibility and effectiveness of the proposed system.
Examine Applicability of the RANS and LES Method on Numerical Simulation of Centrifugal Pump
Authors: Zhang Shu Jia , Tong Yue Ping , Hu Le
Published: May 2011

In order to examine applicability of the Reynolds-Averaged Navier-Stokes （RANS）using Reynolds Stress equation Model (RSM) and the Large Eddy Simulation (LES) in numerical simulation of centrifugal pump, a series of 3D numerical simulation at the design point and at six off-design points were carried out with the two methods. The object is based on IS80-65-160 centrifugal pump. According to the results obtained, head, shaft power, efficiency of pump were calculated, the simulated performance curves of a centrifugal pump is processed. The simulated performance curves of a centrifugal pump were compared with the experimental performance curves. It was confirmed that RANS were suitable for the numerical simulation of the internal flow inside a centrifugal pump. But the result of LES is not very good if the same gambit which is suitable for RANS was used. Therefore, the computer resources, not propose the Large Eddy Simulation (LES) method in numerical simulations of centrifugal pump.
System Modeling and Analysis for Injection Molding Machine Take-Out Manipulator
Authors: Bu Chi Wu
Published: May 2011

A 4-DOF joint type manipulator is presented for injection molding machines. The kinematic and dynamic models of the manipulator have been built. The simulation model has been finished by MATLAB/Simulink/SimMechanics. Results show the property of the trajectory tracking and control torque of the manipulator. It can provide basis for the structural design for take-out manipulators of injection molding machines.
Research on Policy-Based Service-Oriented Computing Security
Authors: Zhang Yong Sheng , Luo Qin , Nie Xue Wu , Bi Xiao Dong
Published: May 2011

This article described the Web Services security protocols, and the policy description language XACML was analyzed in detail in the Web Services. XACML is characterized by the strong ability of expansion and the favorable inter-operation in the access control of the Web Services, which are concluded from the comparison in both SOA strategic architectures. A collection of XACML policy combination algorithms and decision algorithms were discussed in the policy-based service-oriented computing, then the policy control and access control mechanism were also illustrated, and the corresponding decision model was described, at last the development of XACML was prospected.
Network Communication System Based on AT91SAM92 Hardware Design
Authors: Luo Dong Yun , Zhang You Mu
Published: May 2011

The network communication system is presented for controller of AT91SAM9261 architecture which is based on ARM926EJ-S core, modular design concept is given by the each har­d­ware related module and driver design. High processing speed of the system on the basis of this system can be extended .
A Preliminary Research on Operation Mode of Condensing Heat Recovery Hot Water Supply System for Water-Cooled Chillers
Authors: Cai Wei , Du Xiao Man , Wu Zhao Hui
Published: May 2011

The objective of the present paper is to investigate the condenser heat recovery in water-cooled chiller system. According to the technology characteristics of vapor compression refrigerating cycle, the viewpoint of condensing heat reclaim was proposed, and heat recovery system can be used in buildings. Air-cooled and water-cooled chillers with heat reclaim capability were discussed. Three optimized water system designs were introduced for more heat recovery or higher heating water temperature. The results show that it is very useful for designing and developing the new heat recovery unit with high efficiency, energy conservation, and environmental protection by analyzing the feature feasibility of condenser heat recovery system. The control of entering-condenser water temperature is recommended for higher chiller efficiency and operating steadily, the water system designs of preferential loading and side stream are for more heat recovery.
Optimization Design of Electromagnetic Conductance Sensor for the Water Content of Crude Oil inside Pipeline
Authors: Chang Li , Xu Qing Hua , Liu Ben Wei
Published: May 2011

In the measurement of water content of crude oil inside pipeline, the traditional electromagnetic conductance sensors cannot achieve the measurement of water content due to the influence of pipeline closure and electromagnetic shielding. In theory, the double-coil array electromagnetic conductance sensor can obtain the measurement of water content with low frequency sine signal as the motivation. However, its longitudinal resolution is too low and the characteristic is poor. The four-coil model has been established so as to improve the sensor vertical resolution. The simulation results indicate that the useful signal is concentrated in the internal of main coils, which plays a good role of longitudinal focus.
Study on Dynamic Balance in Main Driving Mechanism of Cold Rolling Mill Based on the Particle Swarm Optimization Algorithm
Authors: Tang Wen Xian , Sun Jun Jie , Wang Bin
Published: May 2011

A method for comprehensive dynamic balance of mechanism based on the particle swarm optimization is presented. This paper adopted nonlinear multi-objective programming method to carry out a study on three dynamic property indexes including inertia force, reaction of kinematic pair and input torque. Optimum solution for the parameters estimation problem based on the particle swarm optimization algorithm is obtained by constructing a fitness function of the mathematical optimization model, which consists of those property indexes. The simulation results indicate that the proposed method could eliminate the reluctant evaluations and interactions remarkably, thus improves the application's performance.
Defects Inspection of Steel Ball Based on Optical Fiber Sensing Technique
Authors: Li Guo Ping , Zhang Yong Kui , Ai Chang Sheng , Ma Yu Zhen
Published: May 2011

Surface quality of bearing ball is one of important factors to improve service performance. It is difficult to detect bearing ball surface defects with high precision and low cost by conventional methods. In this paper one new classification method based on optical fiber sensing technology was put forward from the longitudinal section angle. Inspection mechanism of Y-type and coaxial fiber sensor were analyzed, the mathematical models of the two fiber sensors were established and numerical simulations were realized by Matlab software. Influence of optical fiber parameters on light intensity modulation characteristic regulation was studied. Light intensity modulation characteristic experiments were done with specimens of different reflectivity and processing methods. The results show optical fiber sensing technique is an effective method to separate different surface of steel ball with extracting of two parameters displacement and surface reflectivity.
Finite Element Analysis of Drum on the New Type Self-Driven Towing Machine for Cable
Authors: Nie Jin Ning , Wang Hui , Xie De Feng
Published: May 2011

According to the situation that the dual-friction drums on the new type towing machine lack stress analysis when designed, the safety is difficult to test and verify. The pull of wire rope in various positions was derived and calculated, so both compressive stress and tangent friction force generated by the pull of wire rope were calculated. The result made by ANSYS software demonstrates the safety of the left drum which suffers from larger loads, structure improvement measures are put forward for the drum.
A Landing Gear Drop Dynamic Simulation Based on the LMS. Virtual. Lab
Authors: Zhang Li , Xue Cai Jun
Published: May 2011

In order to evaluate the dynamic behavior of the buffer of the Seagull 300 aircraft’s main landing gear, a drop model is built to simulate the drop dynamics using the software of LMS Virtual Lab Motion. The fluid damping force of the buffer, the air spring force of the buffer, the tire force of the landing gear and the weight of the fuselage are considered in the model. The simulation results are compared with the results of the Seagull 300 landing gears drop test, which proves the accuracy of the simulation model. Then the buffer performance and its influence factors are computationally discussed. This method gives a new way to study and improve the performance of the buffer system of an aircraft.
Meshed Chaos Mapping-Based Newton Iteration Method of Mechanism Synthesis
Authors: Che Xiao Yi , Liu Qi Yuan , Luo You Xin , Zeng Bin
Published: May 2011

Kinematic analysis is fundamental for the mechanism synthesis. The kinematic analysis of mechanism is attributed to find the solutions of the nonlinear equations and this process is very difficult. Newton iterative method is an important technique to one dimensional and multidimensional variables and iterative process exhibits sensitive dependence on initial guess point. For the first time, a new method based on utilizing meshed chaos mapping method to obtain locate initial points to find all solutions of the nonlinear questions was proposed. The numerical examples in linkage synthesis and approximate synthesis show that the method is correct and effective.
The Research on Model Updating Technology of Complex Multibody System Virtual Prototyping
Authors: Han Bing , Liu Geng , Wang Hai Wei
Published: May 2011

In this paper, the concept and application of virtual prototype technology are simply introduced, and analyses the veracity program in course of complex multi-body system simulation. The rigid-flexible couple virtual prototype model of complex multi-body system including collision is built, and the veracity of virtual prototype simulation is evaluated combining limited test data. Updating some typical system parameters by sensitivity method and perturbation method, it makes the simulation results have better consistency with test results, and improves the simulation precision of virtual prototype model.
Research on Relationship between Industrial Structure and Economic Growth: Evidence from Henan Province in China
Authors: Liu Shu Hui , Li Wu Wei
Published: May 2011

Based on the statistical data during the period from 2000 to 2008 released by Henan Statistical Bureau in China, this paper applied the grey relational analysis to analyze the relationship between industrial structure including primary industry, secondary industry, tertiary industry and economic growth in Henan province in China. After detailed research, some results have been concluded for Henan province, the first of which is the relationship between industrial structure and economic growth during the period from 2000 to 2008 is very close, and the primary industry is the most important causation that brings about economic growth, the second of which is that tertiary industry played lager important significance than secondary industry during the economic growth in Henan province in China. Research results could provide valuable information for policy makers in government in their efforts to make appropriate economic polices.
Product Life Cycle Energy Consumption Analysis Method Considering Remanufacturing
Authors: Liu Tao , Huang Hai Hong , Liu Zhi Feng , Liu Guang Fu
Published: May 2011

The product life cycle energy consumption model was established considering the impact of remanufacturing on the product lifecycle, and the energy consumption quantitative method was given. In order to optimize the life of a product, a method to calculate its life cycle critical point was proposed. The energy consumption model was applied to two types of gearboxes, new and remanufactured, to compare their life cycle energy, and the energy-saving design scheme optimization was achieved.
Joint Network Traffic Forecast with ARIMA Models and Chaotic Models Based on Wavelet Analysis
Authors: Dong Ming Ke , Chen Chen , Huang Min Hua , Jin Ye
Published: May 2011

In the recent study of network traffic, it is shown that the traffic flow presents both periodic and self-similar characteristics. Due to these two features, the short-term forecast of network traffic cannot be accurately fit in either autoregressive integrated moving average (ARIMA) models which is suitable for linear behavior, or chaotic models which is corresponding to self-similarity characteristic. In this paper, our methodology suggests that by using wavelet multiresolution analysis, we can obtain a joint short-term network traffic prediction method and get a more precise forecast result as compared to using either ARIMA models or chaotic models. We also run simulations to show the improvement of prediction accuracy of our proposed approach.
Motor Bearing Fault Diagnosis Based on MSICA-LSSVM
Authors: Li Zhong Hai , Mao Hao Fei , Cui Jian Guo , Zhang Yan
Published: May 2011

The paper presents a motor bearing fault diagnosis method based on MSICA (Multi-scale Independent Principal Component Analysis) and LSSVM (Least Squares Support Vector Machine). MSICA is introduced into motor fault diagnosis. First, wavelet decomposition is used, and then ICA models are built by wavelet coefficients in each scale, which detect fault, and finally LSSVM is used to classify fault type. Conclusions are obtained from the analysis of the experimental data provided by Case Western Reserve University’s Bearing Data Website. And it indicates that the proposed method is simple and effective.
Synthesis and Characterization of Methyl-Orange/Layered Double Hydroxide (LDH) Nanocomposite
Authors: Liu Jian Qiang , Fu Xing Qi , Song Jian Ye , Fu Yun Xu , Hou Wan Guo
Published: May 2011

In this paper, the intercalation of methyl-orange (MO) into Mg/Al (ratio=2:1) layered double hydroxide (LDH) was carried out using reconstruction method to obtain MOLDH nanocomposite material. Its chemical composition, crystal structure, appearance and thermal stability were characterized by XRD, FT-IR, TEM, TG-DTA and element analysis. It has been found that the MOLDH still keeps the typical lamellar structure, and the guest MO has been intercalated into the layers of the host LDH. The MOLDH’s disassembly temperature is higher more than 30°C than that of guest molecule MO, so it can be used as a new dye with high thermal stability.
An Analysis of Verb Phase Based on Concept Model for Nature Language Understanding
Authors: Li Ya Tao , Zhao Ke , Yi Zhen Zhen , Cheng Pei Tao
Published: May 2011

The traditional intelligent tutoring system as a web-based education tools used for adaptive learning can’t solve the encountered question in time while the student is learning with the absence of nature language understanding system. In this paper, a web-based intelligent tutoring system is firstly introduced to solve the encountered question in real time. Secondly, a concept model representing the concept connotation, the extension and the relation between them is presented to support the nature language understanding system in order to extract the question’s meaning. Furthermore, a knowledge representation of verb and noun in impersonal mature domain is involved. Thirdly, the semantic processing arithmetic of the verb phase is given. Finally, the result of experiment and application of arithmetic are shown.
Face Image Segmentation Using Color Information and Saliency Map
Authors: Huang Hui Ming , Liu He Sheng , Liu Guo Ping
Published: May 2011

In this paper, we proposed an efficient method to address the problem of color face image segmentation that is based on color information and saliency map. This method consists of three stages. At first, skin colored regions is detected using a Bayesian model of the human skin color. Then, we get a chroma chart that shows likelihoods of skin colors. This chroma chart is further segmented into skin region that satisfy the homogeneity property of the human skin. The third stage, visual attention model are employed to localize the face region according to the saliency map while the bottom-up approach utilizes both the intensity and color features maps from the test image. Experimental evaluation on test shows that the proposed method is capable of segmenting the face area quite effectively，at the same time, our methods shows good performance for subjects in both simple and complex backgrounds, as well as varying illumination conditions and skin color variances.
Evaluation of Physical Property of Plasma-Sprayed Coating Based on Ultrasonic Testing
Authors: Wang Xing Guo , Wang Yao Zhi
Published: May 2011

For the purpose of measuring physical property of a coating by non-destructive testing (NDT), acoustic characteristics of plasma-sprayed coating has been studied with the ultrasonic testing. The analytic equation of ultrasonic propagation in the coating based on spectrum analysis is deduced. A transfer function H(f) is established, which contains information on the acoustic properties of the coating. Not only the ultrasonic propagation velocity in the coating, but reflection coefficient, attenuation coefficient, density of the coating can be acquired. This method overcomes shortcomings that the acoustic parameters cannot be measured due to mutual superposition of multiple reflected waves at the same interface of the coating. Porosities of the coatings were tested by buoyancy method. It is found these parameters mentioned above can characterize physical property of the coating. The relationships between porosity and reflection coefficient, sound velocity, attenuation coefficient were investigated, respectively.The results show that reflection coefficient and attenuation coefficient increases with the increase of porosity of the coating. The sound velocity decreases with the increase of porosity. The method is suitable for the evaluation of the coating quality.
Research on Nitrogen Removal Performance of Leachate Treatment of WSIP Reactor
Authors: Duan Xiu Ju , He Qiang , Liu Ya Li
Published: May 2011

This thesis put forward the treatment concept of “without Biomass Retention Sequential Batch Intensified Pretreatment (WSIP)” in leachate treatment, for sake of improving performance of nitrogen removal, optimizing excess water’s nutritional ratio and benefitting the follow-up aerobic biological treatment. Based on orthogonal experiment of WSIP Reactor’s leachate treatment performance, Conclusions can be drew: the removal performance of ammonia nitrogen and TN is higher of WSIP, in which short-cut nitrification and denitrification can be realized; HRT, DO and sequential period are remarkable factors of ammonia removal performance, TN removal performance and realization of short-cut nitrification and denitrification; In normal temperature, the most perfect functional parameter of WSIP Reactor is: HRT=4d, DO=0.75mg/L and sequential period is 6h.