bluuebunny/crossref_metadata_2025 huggingface dataset:
Research on Optimization of Kinematic Parameters of Pectoral Fin
Authors: Liu Qiang , Ji Zhi Cheng
Published: December 2012

Since the propulsion performance of fish pectoral fin is directly related to its kinematic parameters, for improving the propulsion performance of pectoral fin, the kinematic model of propulsion motion of pectoral fin was established, the hydrodynamic force acted on the pectoral fin during propulsion motion was calculated and the mathematic model which optimized the propulsion performance of pectoral fin was established. Then MATLAB was used to write the genetic algorithm program which is used to get the optimal solution of kinematic parameters of pectoral fin. Finally, the simulation analysis of the propulsion performance of pectoral fin was developed. From the simulation result, it can be got that the optimal model established and the optimal algorithm adopted can play an important role in improving the propulsion performance of pectoral fin. Therefore, the optimal analysis developed in this paper is reasonable and effective as well as provides theoretical reference to the research on the bionic pectoral fin and the new underwater maneuvering vehicle.
Analysis on Rotating Dynamics of Tennis
Authors: Qian Yi Qing , Qiu Zu Jian
Published: December 2012

High speed torque is very important in tennis batting process , this paper discusses the shoulder and torso rotation torque generated by the weight of tennis sports influence. Taking 48 tennis players as research objects, the rotation torque of professional tennis players are relatively outstanding with performance value,so we concluded that in the case of keeping the torso erect and through the process optimization of the rotation, we could combined shoulder movement and body bottom-up movement. These results suggested that some given hitting model can not only increase the performance of the tennis player on the pitch, but also reduce the risk of causing excessive damage.
Research and Application of Produduct Design & Manufacturing and MIS Integration for Automobile Generator
Authors: Chen Jian Qing , Wan Dong Hui
Published: December 2012

This paper first analyzes design and manufacture characteristics of automobile generator, and then the management condition and product design of small automobile generator manufacturers. Based on this information, we research the integration and application of the production and management information system for automobile generator used in small manufacturers including the network structure of whole project design system, research and developing content, key technology and major creation proposal.
Dynamics and Control of a Flexible Flapping Wing Aircraft
Authors: Zhao Zhuang , Jiang Hai Yuan , Chang Hua , Guo Jing
Published: December 2012

To investigate the aerodynamic performance of a flexible flapping wing aircraft, a flapping-wing system were design and an experiment were set up to measure the unsteady aerodynamic forces of the flapping motion. The thrust formula and resistance formula described aerodynamic forces. The lift and thrust of this mechanism were measured for different angles of attack and wind velocities. Results indicate that the thrust increases with the flapping frequency and the lift increase with the wind velocity, while the lift coefficient decreases while the velocity increases. It is realized that the wing’s transformation which imitated birds leads less resistance when flapping upward which impacts the aerodynamic lift generation and the bionic winglet leads to a change in the leading edge vortex and span-wise flow structures, which decrease the airflow’s backward pull. Models were introduced which were used in the design process and show its aerodynamic performance. The flexible flapping wing vehicle is still an open research area.
Heavy Metal Pollution Analysis in Topsoil Based on BP and GA
Authors: Wang Xiao Feng , Wang Hong Ke
Published: December 2012

Heavy metal pollution in Topsoil is increasingly serious. In the paper, we present a novel analysis method for heavy metal pollution in Topsoil using Back-propagation (BP) Algorithm and genetic algorithm (GA). Usually there were many methods, including differential equation, but accuracy of these algorithms is not high. To acquire position and analysis of heavy metal pollution, we introduce GA and BP neural network. First, we build BP model and acquire the optimal weights and thresholds of BP through optimization of GA. At last, we search for global optima position of heavy metal pollution sources by GA. Experimental results show that better performance can be obtained by combining GA-based BP and GA-Based optimization.
Study and Prevention on the Diffusion Rule of Dust Pollution in the Coal Mine Whole-Rock Fully Mechanized Workface
Authors: Cheng Wei Min , Nie Wen , Pan Gang , Cao Sen , Zhang Xin Hua
Published: December 2012

The mathematical model of solving two-phase flow of gas and dust particles was built by established the k-ε-Θ-kp equation. Moreover, by using FLUENT software, the diffusion rule of dust pollution in the whole-rock fully mechanized workface was researched with different air-draft amount. The result showed that when the air-draft amount increased from 320m3/min to 600m3/min, de-dust ability of extraction fan drum is gathering strength, pervasion intensity of producing dust is continuously decreased in tunneling place. The simulation results of each measuring point are basically consistent with the field measurement results.
Analysis the Results of TOFD Inspection in Butt Joint Welds
Authors: Zhang Peng Lin , Dong Juan , Cao Li
Published: December 2012

In the application of the TOFD inspection method, the analysis of test results is the focus and aporia of the study. TOFD image analysis include: analysis of defect size, location analysis and defect map features. In order to increase people's understanding of the TOFD technique, given butt joint welds TOFD and RT detect. The paper introduces basic process of defect using the TOFD method, describes method of quantitative orientation of the defect in detail, analyzes the localization and quantification of defects in detection. Determine the qualitative of defects by Ray photographs and analyze the characteristics of the defects of this nature in the TOFD image.
Formation Flying Configuration Design for Highly Elliptical Orbit Satellites
Authors: Zhang Xiao Kun , Yuan Chao , Wu Xiao Jing
Published: December 2012

A constellation design method is presented which applies to formation flying configuration of highly elliptical orbit satellites. The design method uses approximately relative kinematics equation in determining initial satellite orbits elements of the constellation with an envisaged formation flying configuration and precisely relative kinematics equation in predicting orbits, and then analyzes the envisaged configuration stability so as to judge whether or not the configuration can be well maintained only by natural disturbing forces, without the need to add any control. The approximately relative kinematics equation is derived from the precisely relative kinematics equation on the basis of two assumptions. The precisely relative kinematics equation can take into account all kinds of disturbing forces in order to analyze the constellation configuration stability in as real dynamics circumstances as possible. In the presented work, the configuration design example of a constellation composed of five surrounding satellites and an objective satellite, all with high eccentricities, are analyzed by simulations. It is seen that the constellation design method effectively solves formation flying configuration for highly elliptical orbit satellites.
The Development of a New Drum Washing Machine with Universal Motor
Authors: Huang Chao Hua , Li Mu
Published: December 2012

The brush with universal motor in the existing drum washing machines features easy-to-wear, poor reliability and low efficiency. In this paper, a new washing machine with universal motor is introduced. In this product, the technical performance indexes of the universal motor is improved, production cost is reduced, and also the service life is longer, because the lamination accuracy and optimization coiling method improving rotor's lamination and the process control of low noise, low vibration, and abnormal-sound-free of the motor in high rotation speed are applied. Experiment indicates that this product features low noise and high overload ability, and its technical reliability, efficiency and noise are satisfactory.
Turbo-Shaft Engine Model Compensation Based on LSSVR
Authors: Lu Feng , Lv Yi Qiu , Lin Wei
Published: December 2012

Considering the larger modeling errors between the turbo-shaft engine and on-board model, the model correction method based on least squares support vector regression is proposed. Firstly, the modeling principle of on-board turbo-shaft engine model is introduced, and then the structure of model combined with a compensation module is designed. The algorithm of LSSVR is used to build up the model compensation module, which is trained off-line and corrected on-line. Simulation studies on turbo-shaft engine have shown that the LS-SVM method can effectively reduce the model errors, and comparison with the interpolation correction, neural network one, the method proposed has better precision.
Design for Incline Impact Testing Machine
Authors: Cao Le , Yuan Yan
Published: December 2012

Focusing on the actual demands from the packaging laboratory on the incline impact testing machine and the characteristics of the incline impact, a new incline testing machine with flexible impact panel has been designed. It firstly introduces the overall project design for the instrument, then gives detailed introduction to the major parts such as the winch, impact incline, impact panel, car, support and so on from the following three aspects, namely the design idea, design approach and design result, finally illustrates the assembly and usage for all the parts of the instrument. As for t this instrument in this paper, first place the impact panel horizontally, then under the drag of the winch, the car will be lifted slowly at a constant speed and the impact panel will be lifted to be perpendicular to the incline by the hydraulic cylinder. The design for this instrument has a great significance in the experimental teaching for packaging engineering and related scientific researches.
Non-Linear Unstability Model and Analysis of the Engine Main Journal Bearing
Authors: Shao Kang , Liu Chang Wen , Bi Feng Rong , Wang Xia , Zhang Jian
Published: December 2012

On the base of Reynolds equation, the dynamic load of an engine crankshaft main journal bearing system is studied. The oil film pressure is solved from the non-Newtonian Reynolds equation with non-linear model of a finite length journal bearing. The flexible crankshaft is coupling with hydrodynamic lubrication of bearing film. The elastohydrodynamic bearing is treated as non-linear bearing with the finite difference method when considered the unstability load that was acted on the main journal. This paper aims to identify the non-linear effect of engine main bearing in the case of unstability load.
SVPWM Control of Cascaded H-Bridge Multilevel Inverters
Authors: Lu Zheng , Chen Ju Xian
Published: December 2012

To solve the problem of computational complexity in H bridge cascaded multilevel inverter (HBCMI) control, this paper proposes a simple space vector pulse width modulation control algorithm. Base on the topology configuration of HBCMI, the output voltage is deduced, which is the difference value between two-level inverter group output voltage formed by left bridge arms and by right bridge arms. The control complexity is independent of inverter voltage level and it is suitable to every voltage level. To verify the algorithms, different level cascaded H-bridge inverter drive systems were constructed and simulation results are present.
Control Architecture and Control Laws Design for Multiple UAVs Formation Flight
Authors: Meng Guang Lei
Published: December 2012

An autonomous formation-flight method for multiple UAVs (Unmanned Aerial Vehicle) was designed. First the mathematical representation of formation shape was analyzed. Then the control architecture was devised for multiple UAVs formation flight based on finite state machine. The flight states of the wing UAV were built through the formation flight and the transformation relationships of these flight states were defined. So the automated transformation among these flight states could be achieved and the intelligence of the pilots could be mimicked by this way. Aiming at the typical flight state which is capable of maintaining the formation shape, the control laws were contrived for the wing UAVs. Finally, two nonlinear fighter models which have 6 degrees of freedom were selected to carry out autonomous formation-flight experiments. And the results show the control laws designed for maintaining the formation shape are valid.
Synchronization Control for an Uncertain Dynamical Network
Authors: Li Hui , Zhao Zong Tao , Li Li Jing
Published: December 2012

Synchronization of an uncertain dynamical network time-delay is investigated by means of robust control schemes. This paper is devoted to the robustness analysis of controlled complex network concerning the effect of communication delay and uncertainty, where the topology is not exactly known in the synchronized process. First, we analyze the synchronization error dynamical model of the uncertain networks concerning time-delay. Then, based on this system, we derive a sufficient condition for globally asymptotical synchronization of the controlled uncertain network without time-delay in terms of linear matrix inequality by using Lyapunov approach. Furthermore, we investigate robustness property of the controlled uncertain network affected by time-delay, and give a design criterion for the control to guarantee globally asymptotical synchronization. Finally, A simulation is provided to show effectiveness of our strategies.
Overview of Fiber Optic Pipeline Monitoring Sensors
Authors: Li Li Jing , Pan Rui , Zhang Wen Hui , Li Hui
Published: December 2012

This paper provides a review of fiber optic pipeline monitoring sensors development over recent decades. We analyze pipeline monitoring sensors based upon different optical techniques, such as Sagnac effect, Brillouin & Raman backscattering, fiber Bragg grating, Mach-Zehnder interference and OTDR (Rayleigh backscattering). We present theoretical principles & experimental achievements by the different techniques and analyze the advantages & weaknesses for each technique. Finally, some future research directions in this research field are discussed.
Multi-Sensor Measurement Fusion via Decoupled Alpha-Beta-Gamma Filtering
Authors: Fong Li Wei
Published: December 2012

A decoupled alpha-beta-gamma filter is developed to centralized measurement fusion for tracking the same maneuvering target in a multi-sensor environment. Based upon data compression and decoupling techniques, the Tracking Index which is defined as the target maneuverability to the fused measurement uncertainty ratio plays the fundamental role in the steady-state solution. The solution yields a closed form, consistent set of tracking gains and error covariance expressed as a function of the steady-state gains. The proposed filter provides a methodology to integrate measurements into one to obtain a final state estimate using closed-form equations. The simulation results are presented which demonstrate the effectiveness of the proposed method.
The Research of Fuzzy-PID Control Based on Grey Predition for AUV
Authors: Li Qi , Shi Xiu Hua , Kang Zhi Qiang
Published: December 2012

The complexity of sea environment and the uncertainty of AUV model lead to difficulties of heading control. It is difficult to satisfy its requirement for high accuracy and fast speed through the use of a single control method, based on the peculiarity of AUV and the existing problem of control, We propose a fuzzy-PID control method based on a grey model, which combines fuzzy control with PID control, Our simulations confirm that our method provides higher robustness and adaptive property than regular PID, it is suitable for the use of AUV in complexity sea environment.
Multi-Agent Based Modeling of Warship Combat Command and Control System
Authors: Wang Xing Zhong
Published: December 2012

To solving the inefficiency-problem in warship combat command and control system, this paper builds multi-agent oriented system architecture. It uses CORBA to support communication among heterogeneous systems and uses UML to design system prototype. Taking our two warships chasing an enemy-warship collaboratively for example, this paper illustrates the agent-oriented modeling process, including the role model, interaction model, state model and class model. This approach is able to meet the needs of modeling the warship combat command and control system.
Multi-Stage Health Diagnosis for Concrete Cable-Stayed Bridge Based on EWMA Control Chart
Authors: Liang Zong Bao , Sheng Ming Lan , Hu Yi Ran
Published: December 2012

To overcome the huge difficulties in constructing an accurately finite element model in health diagnosis of bridge, this paper presented an improved diagnosis method via exponential weighted moving average (EWMA) control chart. Firstly the characteristic of the live-load effect of main girder strain in a bridge was analyzed as a theoretical basis of the proposed strategy. Then wavelet analysis was employed to extract the live-load effect of strain from the total measurement as sensitive feature for structural health diagnosis. Finally the EWMA control chart was designed to complete the structural health diagnosis of bridge, in which the multi-stage control limits are estimated by reliability analysis. The results from application in a concrete cable-stayed bridge show significant effectiveness of the proposed method in health diagnosis of bridge.
Quality Control System for Die Castings Based on Statistic Analysis
Authors: Ruan Xiao Fang
Published: December 2012

Die casting technology is applied widely for mass production of non-ferrous metal parts. How to guarantee the quality of die castings is always a concerned topic. A quality control system for die casting machine was developed based on statistical analysis of technology parameters. Firstly the original data is acquired from die casting machine and the technology curves are displayed. Secondly, the technology parameters are identified automatically and a database of technology parameters is established. Thirdly, a statistical analysis based on the database is performed. The statistics parameters of expecta -tion and deviation are figured out and the probability distribution diagrams for technology parameters are displayed. Finally, Tolerances for technology parameters are figured out and then the system will monitor the die casting process according to the tolerances. A practical system realization in a die casting machine is demonstrated by its monitoring interfaces. Statistical information and on-line monitoring provided by this system are helpful to guarantee the quality of die castings.
Process Scheme Based NC Machining Chain Model for Aircraft Structural Parts
Authors: Chen Shu Lin , Zheng Guo Lei , Du Bao Rui , Chu Hong Zhen
Published: December 2012

Although intelligent NC programming technology has made some progress, the efficiency and practicability were not high. For this reason, we presented the intelligent NC programming pattern based on process scheme (PS). In this pattern, some models and the rules were mainly proposed. Firstly, by analyzing the machining characteristic of aircraft structural parts, we established the tree model of PS and the constructing rules. Secondly, we constructed the extended generalized pocket model by slicing recognition to create the machining volume model (MVM). Thirdly, the machining chain model was put forward based on the PS and MVM. Finally, the developed pattern and model have been applied in the intelligent NC programming system of aircraft structural parts and are validated with high practicability and efficiency through a case study.
Calculation on Acoustic Scattering of Viscoelastic Layer Coupling with Elastic Shell
Authors: Jin Zhong Kun , Wang Tong Qing
Published: December 2012

This paper is devoted to numerical research on coupling between elastic spherical shell and the coated viscoelastic layer as well as the scattering of incident plane wave by the double-layer spherical shell. The scattering sound field is solved based on impedance boundary condition by boundary element method (BEM). Dynamic finite element method (FEM) is used to numerically simulate the acoustic impedance boundary condition which involved in the coupled spherical shell. Impedance distribution for elastic spherical shell and elastic spherical shell coated viscoelastic layer is calculated and its effect on the target strength (TS) is discussed finally.
Applied Research on the Closed-Loop Control of Oil Production System with Progressing Cavity Pump
Authors: Zhu Duan Yin , Xu Jian Ning , Gao Yan Xiong , Lv Wen Jie
Published: December 2012

It aimed to dynamic change of oilfield productivity, maked sure that the progressing cavity pump is working in a highly efficient region. It combined variable frequency conversion technology and dynamic liquid level height control technology, the closed-loop control of oil production system with progressing cavity pump is made up of rotation-speed and torsion sensor, stepless motor, frequency converter, PLC and progressing cavity pump. The result show that the system can control the pump submergence depth by adjusting the rotation-speed and torsion of polish rod, and make sure the pump working in a highly efficient region finally. This system also can increase recovery efficiency and pump service life.
Research on Numerical Simulation of Jet Pump Design System Parameters Matching in the Oilfield
Authors: Zhu Duan Yin , Xu Jian Ning
Published: December 2012

Jet pump has different basic characteristics when it is used in different application condition. According to jet pump structural design matching technological parameter used in the oilfield unloading system, research on four kinds of numerical simulation algorithms. They are work characteristics of ground power pump model, target liquid production model, current pressure model and pump setting depth model. The results show that the four models can meet the needs of structural design and technological parameter calculation in different conditions. This paper form system theory, provide for pump design and selection matching for jet pump unloading system used in well.
Combined Effects of Gamma-Ray Radiation and Repeated Hot-then-Cold Stresses on the Springback Degradation in Invar Alloy
Authors: Yang Cheng Fu , Wang Wei Wen , Chen Hsin Hwa , Chu Chih Hung , Sun Wei Tan , Lin Jing Jenn
Published: December 2012

In this paper, we report the characterization of springback degradation of an Invar sheet with a combination of gamma-ray irradiation and repeated hot-then-cold stresses. The springback factor value of fresh Invar without radiation shows a linear increase with the number of hot-then-cold stress cycles. Continuous springback degradations are observed as the number of hot-then-cold stress cycles reaches 100. When the Invar sheet is subjected to gamma-ray irradiation, the springback factor is greater than that of the repeated hot-then-cold stressed samples. After applying the repeated hot-then-cold stresses to the post-irradiated Invar sheets, the springback factors are first restored to the value of fresh Invar, and then revert to an increasing trend. Our previous X-ray diffraction (XRD) analysis excluded the crystalline structural changes in the post-irradiated Invar. It is believed that the radiation-induced defects, which are closely related to the springback degradation, are possibly annealed during the first 20 hot-then-cold stress cycles. These cycles ultimately dominate the springback behavior of the stressed Invar sheets.
In-Service Transient Load Measurement on a Large Composite Panel
Authors: Ramazani Mohammad Reza , Sewell Philip , Noroozi Siamak , Koohgilani Mehran , Cripps Bob
Published: December 2012

Current practices to estimate the pressure loads on the hull of small high-speed craft in a seaway are based on determination of the wave loads by applying rules and standards which itself relies either on often conservative methods, leading to a craft that is heavier and slower than it could be otherwise. There are rather large uncertainties in the wave load predictions for ships mainly caused by not necessarily sufficient theoretical basis of the calculation methods. Direct pressure measurement techniques can only provide data at each transducer location and classical analytical techniques require a large amount of experimental data to be collected to relate pressure to the structures response. The evaluation of wave generated hydrodynamic loads is less reliable as the dynamic nature of the loading as well as transient effects such as slamming and green water on deck still demands more investigations. Therefore, a novel technique is required to overcome these limitations by providing a method of measuring the pressure load with relatively few sensors and minimal data collection. This paper reports on research undertaken to develop an inverse problem approach utilising an Artificial Neural Network (ANN) for quantification of in-service, transient loads in real-time acting on the craft from the craft’s structural response (strain response to load). This study investigates suitability and performance of utilising ANN as an inverse problem approach to estimate impact loads applied to up to 13 locations on the structure in real-time from 16 strain measurements.
A New Method to Determine the Fatigue Limit and the p-S-N Curve
Authors: Zhai Jian Ming , Li Xiao Yang
Published: December 2012

The performances of material fatigue can be illustrated by the S-N curve, the p-S-N curve and the fatigue limit, which are very important to engineering and the mechanical design. Recently, the author proposed a new method to determine a conditional probability density distribution surface(CPDDS) of the material, and the surface can reflects most properties of the material’s fatigue. Methods to obtain the theoretical fatigue limit and the p-S-N curve are introduced in this paper on the basis of previous study. The methods are applied on the fatigue test data of C45 steel, and the p-S-N curves that obtained by various methods are compared in this paper.
Evaluation of Natural Flocculants for Conventional Water Treatment
Authors: Afolabi Ayo Samuel , Sigwadi Rudzani A. , Abdulkareem Ambali Saka , Mateescu Corina Mary
Published: December 2012

Drinking water is contaminated from the chemicals and biological impurities around the world mostly in rural area. These contaminations may come from natural sources and leaching of waste deposits which cause a major human health hazard in many parts of the world. There has been very little scientific research work into the use of natural flocculants to purify raw water. Most of the research studies that have been done on conventional water purification in developing countries have focussed on conventional water purification systems using inorganic and poly-electrolyte flocculants. Such systems are very expensive for rural communities in these developing countries as our objective is to provide water that is safe for human consumption by using facilities which can be constructed and operated at a reasonable cost. There is a need to evaluate natural flocculants for conventional water treatment in order to develop inexpensive ways for developing countries to purify their water. In this study, the natural flocculants such as Moringa seeds powder, Guar Gum seeds powder, aluminium sulphate and polyelectrolyte were tested in a jar test apparatus to determine the optimum operating conditions for water or wastewater treatment plants. The results showed that the addition of Moringa Oleifera seeds powder, Guar Gum seeds powder, aluminium sulphate and polyelectrolyte flocculants improved the quality of raw water. The raw water samples from all treatment plants showed a reduction in turbidity that was more than 70% when all the four flocculants applied synergistically.
Correlation between Optical and Electrical Properties of the Pulsed-Laser Deposited Amorphous Films of Germanium
Authors: Avjyan Karapet , Khachatryan Ashot , Matevosyan Lenrik , Mkrtchyan Arsen , Vardanyan Gevorg
Published: December 2012

Amorphous films of germanium (thicknesses 25 - 450 nm) were obtained on glass substrate at room temperature by the vacuum (residual gas pressure 3´10-6 mm Hg) pulsed-laser (Q-switched glass: Nd3+ laser (1.064 µm wavelength, 30 ns pulse duration, laser energy - 3 J per pulse, laser intensity on Ge target ~109 W/cm2)) deposition method. The comprehensive study of the optical and electrical properties of amorphous films of germanium showed the presence of two types (A and B) of films with different characteristics. With increasing of film thickness from 100 nm to 450 nm we observe the transition from the prevailing topological disorder (A- type) to the quantify disorder (B- type) in the region of 300-350 nm. Thicker films are characterized by a more homogeneous “network” of bonds, which minimizes the number of defects and localized states in the “forbidden” gap and, consequently, increases the resistivity and optical gap. An increase of the resistivity and optical gap is observed with decreasing film thickness (< 100 nm), which is explained by an increasing influence of natural oxidation of thin films. The results of temperature measurements for A- type films shows that the temperature dependence of resistivity is characterized by Mott's law (lnρ ~ T-1/4) in the temperature range of 100-240 K, while for B- type it indicates an activation character (lnR ~ ΔEa/kT) in the temperature range of 150-350 K.
Wavelet Analysis of Carbon Fiber Composite Material Flaw Detection
Authors: Jia Ji Hong , Xie Xia , Lu Xue Cheng
Published: December 2012

In order to reduce or avoid the damage of the composite parts in the service process and failure, This study applied db5 wavelet processing and multi-scale(5 layers) analysis to the denoised signals from carbon fibre reinforced composite material. Through repeated verificationput, put forward a fast and accurate method for estimating damaging degree. the advantage of this method is preventing component failure, and this method is proved effective.
Cutting Parameters Optimization of Thin-Walled Workpiece Based on PSO and FEM
Authors: Qian Li Li , Chen Wei Fang , Ma Wan Tai
Published: December 2012

An approach to optimize the cutting parameters based on Particle Swarm Algorithm(PSO) and Finite Element Method(FEA) was proposed. A cutting parameters optimization model was established whose design variables are the cutting parameters and objective function is to minimize the maximum deformation. PSO was used to optimize the cutting parameters and FEA was utilized to predict the machining deformation of the thin-walled workpiece. Finally, the entire technique was demonstrated in a case study. The simulation and experimental results show that the approach can be further employed into the practical machining situation.
Computational Inteligence in Optimization of Machining Operation Parameters of ST-37 Steel
Authors: Golshan Abolfazl , Ghodsiyeh Danial , Gohery Scott , Amran Ayob , Baharudin B.T. Hang Tuah
Published: December 2012

Optimal selection of cutting parameters is one of the significant issues in achieving high quality machining. In this study, a method for the selection of optimal cutting parameters during lathe operation is presented. The present study focuses on multiple-performance optimization on machining characteristics of St-37 steel. The cutting parameters used in this experimental study include cutting speed, feed rate, depth of cut and rake angle. Two output parameters, namely, surface roughness and tool life are considered as process performance. A statistical model based on linear polynomial equations is developed to describe different responses. For optimal conditions, the Non-dominated Sorting Genetic Algorithm (NSGA) is employed in achieving appropriate models. The optimization procedure shows that the proposed method has a high performance in problem-solving.
A Study on Recycling of Supreme Garnet in Abrasive Waterjet Machining
Authors: Pi Vu Ngoc , Chau Hoang Van , Hung Tran Quoc
Published: December 2012

This paper presents a new study on the recycling of Supreme garnet (or IMC garnet) in abrasive waterjet machining. In this study, the reusability of the garnet was investigated. Also, the optimal particle size for the recycling of the garnet was pointed out. In addition, the cutting performance and the cutting quality of the recycled abrasive were investigated by comparing with that of new abrasives. From the results, the way how to recycle effectively the garnet was proposed.
Research of Product Information Sharing System Based on Cloud Manufacturing
Authors: Ai Qing Song , Mo Kui , Wang Yan , Zhao Lei
Published: December 2012

Nowadays, most manufacturing enterprises have realized that the ability to share product information in a quick, real-time, and effective manner between geographically located team members is very crucial for them to survive in the keen competitive global market. However, the existing product information sharing systems have many problems in universality, dynamic, and portability. This paper presented a product information sharing system based on the research of the fundamental theory and key technologies of cloud manufacturing. Our work focuses on proposing a six-layer architecture of the system. For comparison, we discussed the advantages of it. Finally, to validate the architecture, we developed a prototype system. The test results show that the proposed architecture provides a commendable mechanism to better share product information.
Research on the Data Segmentation Technique of Large Rapid Prototyping Sample Based on Features
Authors: Liu Xin , Fan Wei
Published: December 2012

Because of the small workbench molding size of rapid prototyping equipment, the processing of large rapid prototyping samples is a problem during the new product development process, for example, motorcycle covering. The relative merits of accuracy engraving technique and rapid prototyping technique during processing are discussed. The method combining accuracy engraving machine and rapid prototyping machine to processing new motorcycle cover samples is proposed. And the surface data segmentation technique based on features is adopt to divide the large rapid prototyping sample reasonably, and then the small parts are collaged after respectively processing, so the problem of large rapid prototyping sample cannot once molding is solved, the speed of new product development is accelerated, the cost of new product development is decreased, the rapid manufacturing is realized. This method has been applied to the processing of new motorcycle cover samples and the application method is expounded.
An Analytical Study on Thermally Induced Vibration Analysis of FG Beams Using Different HSDTs
Authors: Mareishi Soraya , Mohammadi Mohsen , Rafiee Mohammad
Published: December 2012

Thermo-mechanical vibrations of functionally graded (FG) beams are developed. Governing equations of functionally graded beams are obtained based on higher-order variation of transverse shear strain through the depth of the beam. The material properties of the functionally graded beam are assumed to vary according to power law distribution of the volume fraction of the constituents. Equations of motion and boundary condition are derived from Hamilton’s principle. Beam is assumed under uniform thermal loading and simply supported boundary condition. Analytical solution is presented, and the obtained results are compared with the existing solutions to verify the validity of the developed theories. Numerical computations are performed for a functionally graded simply supported beam with a gradient index obeying power law and the results are displayed graphically and tabular to show the effects of the gradient index, temperature rise, and geometrical parameters on the fundamental natural frequency of FG beams, indicating that natural frequency is sensitive to the gradient variation of material properties, geometrical parameters, shear deformations and temperature rise.
Humidity Sensing Property of Al-Doped Mesoporous Silica
Authors: Geng Wang Chang , Duan Li Bing , Zhang Qiu Yu
Published: December 2012

In order to study the humidity sensing property and sensing mechanism of Al-doped mesoporous silica SBA-15 (Al-SBA-15), Al-SBA-15 was prepared by a simple grind method following a heat-treatment process. Its structure and morphology was characterized by X-ray diffraction (XRD), Infrared (IR), scanning electron microscope (SEM). Humidity sensing response was studied and the results indicated that Al-SBA-15 displayed better sensing property when the frequency was 100 Hz. The impedance of Al-SBA-15 changes three orders of magnitude when relative humidity changes from 11% to 95%. Complex impedance spectra, the corresponding equivalent circuit under different relative humidity are carefully analyzed to explore the humidity sensing mechanism of this material. This material can be used as a promising humidity sensing material.
Modeling and Analysis on the Gearbox of Driven Tool Holder
Authors: Gui Yan , Zhang Qi
Published: December 2012

Various methods of calculating transmission error in spur and helical gears are used to predict T.E. at the design stage. In order to reduce the driveline noise of the noise excitation mechanism, an advanced algorithm is used to predict and optimize the TE of a gear pair and the system response of specified TE excitation is investigated for the driven tool holder. And the CAD model was then meshed in Hypermesh with designable and non-designable areas. A pair of spur gears were investigated through static and dynamic analysis in detail.
DCC: A Replacement Strategy for DBT System Based on Working Sets
Authors: Zhang Kang , Zhou Fan Fu , Liang Alei
Published: December 2012

Limited memory resource has always been deemed as the major bottleneck of the program performance, not excepting for dynamic binary translation (DBT) [1] system. However, traditional methods seldom enable this issue mentioned to be solved better due to a ﬁx cache size routinely assigned for codes without considering the program behavior on the ﬂy. Though some prediction methods implemented via LRU [2] histograms can achieve better performance in Operating System, unlike pages in memory, blocks in DBT have unﬁxed sizes each other, making the prediction imprecise. In this paper, we present a new replace policy named DCC (Dynamic Code Cache) based on working set [3] for bounded code cache, which would dynamically change the size of the code cache and clear the cache according to the information of working set detected. It would sacriﬁce a small part of the performance to save the space, especially when many great or complicated applications are running on the same physical machine, and the performance might be better under this condition. For Evaluating, we test this strategy on a DBT system named Crossbit [4].We get around 30% space saved up with about 12% running time sacriﬁced.
A Multi-Mode Vibration-Based Power Generator for Vehicles
Authors: Hashimoto Seiji , Nagai Nobuyuki , Fujikura Yoshimitsu , Takahashi Jyunpei , Kumagai Shunji , Kasai Makoto , Suto Kenji , Okada Hiroaki
Published: December 2012

This paper presents a novel vibration power generation device for vehicles where effective power generation can be obtained by multi-mode vibration of the vehicles. First, road tests of the vehicle are performed, and then the obtained data is analyzed. Next, a vibration power generation device specially designed for the vehicle is proposed. This new device is composed of the multiple masses and spring plates equipped with lead zirconate titanate (PZT), and is effective in multi-mode vibration. The validity of the developed device is confirmed by the simulation and experimental results.
Three-Dimensional Numerical Simulation of the Whole Flow Field on Centrifugal Fan
Authors: Wan Bo , Liang Xue Fei , Sun Tao
Published: December 2012

Centrifugal fan is a kind of widely used turbo machinery. It is widely used in buildings, mines, factories, tunnels, vehicles, ships and air cooling towers and cooling; grain drying and sending; inflatable hovercraft and propulsion. It has many advantages compared to axial fan. In this paper, we study the numerical simulation of the whole flow field of a High-pressure centrifugal fan called 9-16№15.9D.The researches can contribute to a better design on centrifugal fan.
Analytical Solution of the Transverse Vibration of Isosceles Right Triangle Membrane under Different Boundary Conditions
Authors: Zhu De Quan , Zhang Li Hua , Wang Qi Shen
Published: December 2012

Analytical solution of the free vibration of the isosceles right triangle membrane with several different boundary conditions was obtained. Some qualities of the solution were studied, especially, the completeness’s of the analytical solution were proved.
An Integrated Optical Sensor Receiver with the Sensitivity of 0.7 μA Fabricated with Standard CMOS Process
Authors: Liu Lun Cai , Huang Xiao Zong , Huang Wen Gang
Published: December 2012

A fully integrated CMOS receiver front-end with digital output for optical signal processing system is presented. This circuit is composed of trans-impedance amplifier (TIA) for weak optical current detection, post-amplifier for both a linear and limiting amplification, control circuits and the digital output interface. Measured with photodiode which is driven by pulse voltage source, a sensitivity of 0.7μA was achieved. The current model methodology is employed to optimize the noise performance. The front-end consumes the current of 1.5mA with the power supply of 3.3V. The design was done in a low-cost standard CMOS process with 0.6μm featured size, taking area of 600μm×150μm excluding the bonding pads.
Numerical Simulation of Fluid Flow in a New High Efficient Mixer
Authors: Wu Qing , Zhang Ya Chen , Liu Xue Jun , Han Bao An
Published: December 2012

In order to determine proper structural parameters of the new high efficient mixer created by the author, the CFD software is applied to simulate numerically three dimensional incompressible turbulent fields for three static mixing units and the mixing unit with rotating impellor. The static mixing units include three kinds of spiral blades that are single-blade style, three-blade style and four-blade style. Geometric models are built by Pro/ENGINEER and exported to Fluent. The time-mean Reynolds equations and standard turbulent model are applied, and the post-processing software is used to analyze the computational results, and velocity contours and stress contours of mixing fluids in the static mixer will be obtained. The computational results indicate that the direction of outlet velocity of three-blade fluid flow turns more dramatically in comparison with that of single-blade and four-blade fluid flow, and the shearing stress is more remarkable. Because the internal stress of three-blade fluid changes more, the mixing action among fluids is more intensified. All these show three-blade spiral blades have the best mixing effects for local fluids. The rotating impellor mounted between blades can change fluid flow direction and improve the mixing effect for local fluids, which is moved by fluid flow with some velocity.
Dynamics Simulation of a Six-DOF Tunnel Segment Erector for Tunnel Boring Machine Based on Virtual Prototype
Authors: Li Gang , Chen Ya Dong , Wang Bo , Wang Wan Shan
Published: December 2012

In this paper, we present the modeling and dynamics simulation of a six-DOF tunnel segment erector for tunnel boring machine (TBM), which is performed in the virtual prototype platform. The 3D virtual assembling model of a tunnel segment erector is built based on Pro/E software according to its design parameters such as structure and size. After the interference inspection, the model is imported into ADAMS through the interface module of Mech/Pro. The model is simplified and optimized reasonably and various constraints are applied under variety working conditions. The results of simulation show that the design has six degrees of freedom movement capacity which meets the design requirements. At the same time the dynamics characteristics of drives and the forces of each part are obtained and they will provide a boundary condition for strength check and basis for the power system design which is important for the further optimal design.
STL Representation of Axisymmetric Solid Element Mesh
Authors: Tian Zhong Ke
Published: December 2012

This paper develops an algorithm for extracting stereolithography (STL) model from axisymmetric solid finite element (FE) mesh, so as to use 3D physical prototype instead of computer graphics-based visualization to express the deformation result of FE simulation. The key of the algorithm is to recognize contour node pairs from an axisymmetric solid element mesh, which exactly demonstrates that the proposed methodology is independent of axisymmetric element configuration, that is to say, it is applicable for either triangular, quadrilateral, or mixed triangular and quadrilateral axisymmetric solid element mesh.
Automatic Test System for the Basic Properties of Solar Cells
Authors: Tu Jia Jia , Liang Guo Wei
Published: December 2012

A solar cells test system that can be used in the natural environment is designed, which can complete a variety of test experiments on different types of solar cells under different environmental conditions. In the testing process, the basic properties of solar cells are given and recorded in real time. Since installed and operated, the system works stable. Experimental results show that the test system has high accuracy and repeatability, and in line with the requirements of solar cells testing.
Preparation and Structures of Mesocarbon Microbeads
Authors: Zhao Hai , Liu Jun Qing , Wang Bao Hui , Hu Cheng Qiu
Published: December 2012

MCMB were prepared from coal-tar pitch by pyrolysis condensation in the presence of graphite. The characteristics of the MCMB were studied by BET and optical textures of the pitch mixtures were characterized by polarized-light microscopy. Results show that the graphite addition contributes to an increase of MCMB yield. The pyrolysis conditions and content of graphite have notable effect on the structure and yields of MCMB. When content of graphite reaches 3% and the pitch are pyrolysated at 450°C for 4 h, the MCMB yield arrive at 32wt%.
Preparation and Characterization of the Tubular Ceramic Membrane of Tin Dioxide
Authors: Gu Yun , Lin Juan , Han Wei Qing , Liu Xiao Dong , Wang Lian Jun
Published: December 2012

In this work, tin dioxide was chosen to make tubular ceramic membrane. The morphology was characterized by SEM, XRD and Poremaster. The SEM analysis reveals that the distribution of membrane pore is uniform. The average pore size is 2 μm. Pure water flux is 5.26 m3Superscript text•m-2•h-1 at 0.1 Mpa. Porosity of tin dioxide membrane is 40%.
Ultrasonic Fatigue Performance of Welded Joints in 16Mn Steel
Authors: Wu Liang Chen , Wang Dong Po
Published: December 2012

Ultrasonic fatigue performance test of 16Mn steel and welded joints are carried out by using ultrasonic fatigue test system devices developed by Tianjin University to research its fatigue behavior in the super long life regime. The results show that: regardless of the base mental or welded joints, the S-N curve is a continuous decline curve; Welded joints does not exist the traditional concept of fatigue limit within the range of 106~107, when the number of load cycles exceeds 107even 109, fatigue fracture still occurs. Within the super long life range, the fatigue strength of welded joint is much lower than the fatigue strength of base mental. It is dangerous to use the existing fatigue data to design the welded structure within the super long life regime.