bluuebunny/crossref_metadata_2025 huggingface dataset:
Comparative Study of Biogas and DME Fed Micro-CHP System with Solid Oxide Fuel Cell
Authors: Kupecki Jakub , Jewulski Janusz , Badyda Krzysztof
Published: December 2012

This paper presents results of a comparative study of a micro-combined heat and power (CHP) unit with solid oxide fuel cell (SOFC) fed by two different fuels. For current analysis biogas and dimethyl ether (DME) were selected. Detailed model of the micro-CHP system with net power output of 3 kWelwas created, based on an advanced model of the SOFC. In both power units, steam reforming was employed in order to generate hydrogen-rich gas. Reforming temperatures of 900°C and 350°C were selected for biogas and DME, respectively. Both systems were based on the same reference solid oxide fuel cells. Similar plant outlines was employed, with small changes to accommodate different reformer operating temperatures.
Simulation of High Temperature Air – Steam Biomass Gasification in a Downdraft Gasifier Using ASPEN PLUS
Authors: Ngamchompoo Worapot , Triratanasirichai Kittichai
Published: December 2012

A comprehensive process model is developed for high temperature air – steam biomass gasification in a downdraft gasifier using the ASPEN PLUS simulator. The simulation results are compared with the experimental data obtained through pilot scale downdraft gasifier. In this study, the model is used to investigate the effects of gasifying agent preheating, equivalence ratio (ER), and steam/biomass (S/B) on producer gas composition, high heating value (HHV), and cold gas efficiency (CGE). Results indicate that H2 and CO contents have increased when gasifying agent preheating is used, while gasifying agent preheating has no effect with H2 and CO at high ER. At high level of S/B, the concentrations of H2 and CO are related with water-gas shift reaction in significant. HHV and CGE depend on the concentrations of H2 and CO in producer gas, which can increase by preheated gasifying agent. However, gasifying agent preheating should apply with waste heat from the process because there is no additional cost of energy price.
WAMS COI-Based Phasor Visualization Frame for Power System Area Separation
Authors: Bernal Yubelny J. , Rios Mario Alberto
Published: December 2012

A methodology of visualization of the power system oscillation among operational areas is proposed based on PMUs measurements. The method is based on the definition of the center of inertia by operational areas based on phasor measurements on generation nodes. This visualization takes measurements of the PMUs in every single operation area and makes a unique equivalent measure which corresponds to phasor-center of inertia of each operational area. In this way, the observation of equivalent phasors by area allows an easy and clear visualization of the behavior of the power system when a contingency occurs allows the selection of adequate control measures.
An Ontology-Based Collaborative Filtering Personalized Recommendation
Authors: Wang Pu
Published: December 2012

Recommender systems have been successfully used to tackle the problem of information overload, where users of products have too many choices and overwhelming amount of information about each choice. Personalization is widely used in various fields to provide users with more suitable and personalized service. Many e-commerce web sites such as online shop retailers make use of recommendation systems. In order to make recommendations to a user, collaborative filtering is an important personalized recommendation technique applied widely in E-commerce. The collaborative approach faces the hard issue of cold start problem and the matrix sparsity problem. The paper presents a collaborative filtering personalized recommendation approach based on ontology in the special domain. The method combines ontology technology and item-based collaborative filtering. The given recommendation approach can tackle the traditional recommenders problems, such as matrix sparsity and cold start problems.
Line Level Scheduling by Integrating Area Level Scheduling in Manufacturing Systems
Authors: Shim Sang Oh
Published: December 2012

In current automated manufacturing systems, production managers try to implement more efficient and effective scheduling methods which play important roles in supply chain by maximizing utilization of the installed equipments and throughput as well as meeting customers' various demands. In relation to enhancing capabilities and responding demands, some raising issues are discussed, which are transportation of lots between manufacturing lines, management of urgent jobs and workload balancing among areas. In this research, by discussing these scheduling issues, a new concept and its design, which is called as line-level scheduling, are suggested for advanced planning and scheduling systems in the manufacturing systems.
Fatigue Residual Properties of Ti/APC-2 Nanocomposite Laminates after Low-Velocity Impact
Authors: Jen Ming Hwa R. , Chang Che Kai , Chen Jing Guan , Lin Bo Cyuan
Published: December 2012

The post mechanical behavior of Ti/APC-2 hybrid nanocomposite laminates after low velocity impact was investigated. The three layered Ti/APC-2/Ti cross-ply nanocomposite laminates were fabricated according to the modified the diaphragm curing process. Each sample, L×W×t=240mm×25mm×1.55mm, was first subjected to free drop of a rigid steel sphere (diameter=12.7mm) of 1m and 2m high. Then, the samples were due to static tensile tests at room temperature to measure their residual ultimate strength and longitudinal stiffness as the base-line data for constant stress amplitude tension-tension cyclic tests. The corresponding S-N curve, fatigue strength and life were obtained. Also, the failuremechanisms were observed.The mechanical properties do not reduce significantly due to low-velocity impact. Similarly, the fatigue resistance of impacted samples does not lose much. The enhancement by nanoparticles and superior bonding capability of matrix PEEK with Ti sheets take the responsibility of improvement of mechanical responses.
Design of the Shape of Blade of the Semi-Submersible Ocean Current Power Generation Device Based on Fluent
Authors: Zhang Li Zhen , Cao Xiao Long , An Feng Zhen
Published: December 2012

The semi-submersible ocean current power generation device is a new power generation device which can absorb the energy of marine currents. The shape of blade determines the absorbing efficiency which is one of the core technologies. To get force status of the different shape of the blade under the currents by using Fluent software simulate these blades. Then analyze the impacts of the blade shape on the power generation efficiency, the simulation results provide guidance for the design of the actual blades.
Study on Low-Carbon Catalytic Combustion Furnace of Natural Gas
Authors: Huang Si Yu , Yan Long Fei , Zhang Shi Hong
Published: December 2012

This article did a research about temperature fields inside the catalytic combustion furnace with Pd-based honeycomb monoliths of lean natural gas-air mixtures and discussed the feature of the temperature field. In addition, the near-zero pollutant emissions of catalytic combustion burner was proved by a test report provided by NIM. From a low-carbon prospective, the application prospect of catalytic combustion furnace was discussed.
Adaptive Vibration Control of Beraingless Permanent Magnet Synchronous Motor
Authors: Zhang Tao , Ni Wei , Wu Sha Sha , Zhang Hui Ping , Ji Jian Xiang
Published: December 2012

The vibration producing mechanisms of BPMSM were analyzed. Then, the adaptive multiple frequencies tracking algorithm was induced. The vibration feed-forward compensation control method based on adaptive multiple frequencies tracking algorithm was presented. The vibration compensation control system was constructed. Finally, the simulation research was executed. The results have shown that the method proposed in this paper can suppress the rotor vibration effectively.
Based on Mechanical Clamping Device Lever Force Amplifier by Linear Motor
Authors: Yang Yi , Zhong Yi Bo
Published: December 2012

This paper describes a new innovation design idea of mechanical clamping device based on lever force amplifier by linear motor. Based on the idea, design a series of mechanical clamping devices featuring clear logic idea. The corresponding formulas and graphic examples of output force are given of. The lever-toggle force amplifier is aimed to meet the needs of larger output force. Transform the shape of the lever to meet the processing requirements of different sizes of work-pieces.
Kinematic and Dynamic Simulation of Automotive Manual Transmission
Authors: Wang Wen Shan , Xu Jing , Zheng Zai Xiang
Published: December 2012

In the study, a five-speed manual transmission of commercial vehicles is modeled and assembled with three-dimensional (3D) software SolidWorks. In order to analyze the kinematic and dynamic performance of the manual transmission, its 3D model is imported into the software ADAMS and the Hertz elastic contact theory is applied to calculate the contact force and deformation of the meshing gears. Finally, the speed and meshing force of the meshing gears have been obtained, which are consistent with the actual situation. This method can provide guidance for the design of the key components of the transmission, and thus can shorten the development cycle and reduce the development cost of the transmission.
Study on a Modifying Method of Finite Element Model for Analyzing the Shaft Rotation System
Authors: Jin Xu Xing
Published: December 2012

Finite element method is an important computation method for analyzing the shaft rotation system of machine tools. However, due to the structural complexity of the shaft rotation system, the result error between the finite element method and the modal testing is often large. Such error results from the difference between the finite element model and the actual system. In the present study, a finite element model of the shaft rotation system is firstly established, an experiment of modal testing is also carried out to verify the results of mathematical model. Based on the comparison of the error, then the finite element model is modified by means of optimization methods. Finally, the Campbell diagram and the critical speed diagram are calculated, and the optimization values of the stiffness of bearings are obtained. The research results indicate that this method of verifying model is accurate and efficient.
Axial Force Test and Analysis in Riveting Assembly of Automotive Hub Bearing Unit
Authors: Xiao Yun Ya , Zhou Zhi Xiong , Li Wei , Meng Guo Fei
Published: December 2012

A test method for riveting assembly force, used in hub bearing unit assembly, was present in this study. Based on the test results, the influences of motion trajectory of rivet head, structure of rivet machine and feed rate of rivet head on axial force were analyzed. The corresponding improvement measures were proposed.
Analysis of Temperature Field and Thermal Deformation for Lubricating Oil Transfer Pump
Authors: Xu Jian Ning , Lv Wen Jie , Zhu Bin , Zhu Duan Yin , Gao Yan Xiong
Published: December 2012

Lubricating oil transfer pump is an important function subsystem in twin-screw pump system. The friction pair between Lubrication screw and shell also is heat source of the system, not only affect the temperature field of the subsystem and the whole system, and the excessive thermal deformation itself may exist can also cause drive failure. This paper established the temperature field and thermal deformation analysis model and boundary conditions of the lubrication screw by means of Finite Element Analysis, and analyzed temperature field and thermal deformation of the lubrication screw and shell as the coefficient of convective heat transfer is 1200W/m2∙°C in the oil production process, and proved thermal deformation of the lubrication screw and shell can not affect the normal work of Lubricating oil transfer pump in the condition.
Simulation and Evaluation of Wind-Induced Displacements of the Giant Airship in its Outbound Process
Authors: Wang Gai Juan , Qiu Yuan Ying , Zhao Xin Wen
Published: December 2012

Aiming at an outbound process of the airship driven by the hydraulic rod and cables, a simulation of the wind-induced displacement for the airframe is conducted. First of all, a spatial three-dimensional flow field including the boathouse and airframe is calculated using fluid dynamics, and a wind pressure distributed on the airframe is equivalent to the forces and moments exerted on the airship head in three directions. Then, a finite element model of the airship structure is modeled and a simulation of the wind-induced displacements for the giant airship is conducted. Finally, a collision possibility between the airship and boathouse is evaluated, which lays a foundation for designing the boathouse structure that meets outbound conditions for the airship.
Flow Characteristics of Viscoelastic Polymer Solution in Expansion Micro-Pores of Different Pore-Throat Ratio
Authors: Fu Jing
Published: December 2012

Pore-throat ratio is a significant parameter expressing the characteristics of reservoir pores. It has an apparent influence on viscoelastic polymer solution flow in micro-pores. In this paper, Upper-Convected Maxwell (UCM) equation is applied in describing the viscoelastic polymer behavior. The expansion channel models of different pore-throat ratio are selected in process of simulation. And contours of stream function and velocity of different Weissenberg number (We) are calculated and drawn by Finite Volume Method. Results show that, vortex will occur at the re-entrant corner caused by the sudden expansion of channel, size and intensity of the corner recirculation vortex. The residual oil region is reduced and the mobile oil region is enlarged. Microscopic sweep efficiency is increased relatively. Vortex will be larger and stronger, and the velocity will be increased for We. Vortex will be lager as the bigger pore-throat ratio. Micro-sweep efficiency will be capitalized by viscoelastic polymer solution to the utmost.
The Analysis and Simulation of Granule Concentration Distribution in Cross Section of Spiral Slurry Pipeline
Authors: Lin Yu , Lei Ping , Zhang Xiao Dong
Published: December 2012

Through the analysis of force acting on granule in slurry spiral flow and movement characteristics of granules, the granule motion equation, the granule size distribution along radial direction, and distribution of granule concentration on cross section of the pipeline were established. By using computer simulation with FLUENT software for granule concentration distribution on cross section in slurry spiral flow of pipeline, the results of simulation revealed that the granule distribution in slurry spiral flow concentrated in peripheral area of cross section of pipeline, the concentration distribution of granule in center of the cross section area was smaller and more uniform, and the concentration of granule was minimum in pipe wall because of the effect of centrifugal force and circumferential velocity acting granules.
Stress Concentration Calculation of Silo Wall Opening Subjected to In-Plane Tension or Pressure
Authors: Ma Rui Ting
Published: December 2012

In this paper, by using complex variable function and conformal mapping technique, the author studies the stress concentration intensities of silo wall opening through predigesting the stress calculation of silo wall opening as a problem of plane calculation and obtains the stress concentration factor of opening. When simplified silo wall is subjected to in-plane tension or pressure, maximal stress concentration point around opening is at the corner of opening. this paper may provide some referenced value to the designers.
Experimental Investigation of the Edge Stress of Sphere-Cylinder Combined Shell
Authors: Bai Xu , Wang Xiao Tian , Sun Li Ping , Hu Guo Dong , Li Jin Hua
Published: December 2012

Sphere-cylinder combined shell is one of the main pressure hull forms of submersible. This paper analyzes on edge stress of sphere-cylinder combined shell under external hydrostatic pressure. The edge models of cylindrical and spherical parts of combined shells are established by moment analysis and deformation compatibility. In the experiment, a ring-stiffened cylinder with hemispherical end is designed to verify edge models. The results of stress analysis are discussed in the paper.
Phase Transition Determinated by Weighted Monte Carlo Simulations
Authors: Yuan Qing Xin , Wang Zhan Wei , Du Yin Xiao , Zeng Fan Guang
Published: December 2012

We study the weighted Monte Carlo method, which was proposed by Milchev, Heermann and Binder. First, we describe our method and the Monte Carlo procedure. Second, we apply the procedure to study the phase transitions of and Sine-Gordon models, respectively. The critical values of the parameters allow us to determine the phase diagram of the models.
A Simple Co-Rotational Finite Planar Beam Element of Geometrical and Material Nonlinearity
Authors: Cai Song Bai , Li Da Zhi , Kim Chang Wan , Shen Pu Sheng
Published: December 2012

A simple geometrical and material nonlinear co-rotational planar beam element of field consistency is proposed. Herein the element which produces a local stiffness matrix of 3 by 3 other than 6 by 6 is developed. Material nonlinearity is taken into account on the base of yield function of element internal forces. By applying static equilibrium relationship of classic beam theory for the transferring of local element nodal force to global element nodal force, a new transformation matrix different from the nodal displacement transformation matrix is established. Although this results in an asymmetric global tangential stiffness matrix, the new transformation is simpler, and gives rise to field consistency and makes it possible to compute very large beam deflection without remeshing of the deformed structure. Computations of numerical example indicates that formulations for the nonlinear beam element are of validation and high efficiency
Error Analysis in Calculating the Internal Force of Plane Statically Determinate Truss by the Original Size Principle
Authors: Ma Dan , Qu Yan Dong , Kong Xiang Qing
Published: December 2012

Ignoring the deformation effect, the original size principle is normally used to calculate the internal force and deformations of the bars in Mechanics of Materials, the calculation error is not discussed in the textbooks, however. In order to show the adaptability of the original size principle to calculate the internal force of plane statically determinate truss, a case of the two-bar statically determinate truss was also given. The calculation error of the internal force and the angle deformations are quantitatively studied to make a comparison between the actual internal force and that calculated by the original size principle. The research showed that the relative error of angle deformations and the internal forces of the two rods are nonlinear dependent on the external forces (the given force), tensile stiffness and the initial angle of the plane truss. If the strength and tensile stiffness of the bars can meet the requirements of engineering, the original size principle can be used to calculate the internal force of metallic bar truss under the conditions of small deformations.
The Analysis of Pulse Pressure by Vascular Strain
Authors: Tsai Ming Chang , Huang Shyh Chour
Published: December 2012

The objective of this paper is to use the Noninvasive Strain Measurement System to monitor the pulse pressure of the blood’s undulation in the artery as an index for the clinical diagnosis of arteriosclerosis. In the study, a strain-measuring device (350Ω) is affixed to the left side of the radial styloid process, on the surface of the skin, and is connected to the Strain FleXense. An artery-pressuring tape is set on the left humerus, and the measurement of the wavelength and frequency of the heartbeat is taken to compare with the clinical artery wave. The results show that when the subject is in a comfortable position with moderate physiological levels, the heartbeat has no connection whatsoever with blood pressure. The greatest heartbeat strain, which occurs when the veins and arteries respectively are being cleared, displays as a linear change.
Experimental Research on Degradation of Adhesively Bonded Box Beam under Cyclic Torsional Loads
Authors: Feng Qing , Zhang Jing Fen , Hornung Martin , Becher Juergen
Published: December 2012

Abstract. Structural adhesively bonded and spot welded structures in a car body will experience cyclic loading resulting in degradation, especially in energy absorption performance of welded terms. This paper is focused on the degradation of adhesively bonded and weld-bonded box beams versus equivalent spot welded samples. In the first part of this paper, results from the experimental testing of box beams with different joint methods under cyclic torque are presented. The torsional stiffness of box beams is shown to degrade and box beams with different joint methods show different performance. In the second part, 3-point bending crash test results show the different performance of energy absorption with different joint methods. Bonded and weld-bonded box beams with toughened structural adhesive maintain energy absorption performance compared to the original level, while spot welded profiles show a significant decrease.
Strength Analysis of Roller-Metallic Membrane Coupling
Authors: Wang Liang Shen , Sun Hong Tu , Wang Pin , Hou Jie , Xie Zai Yu
Published: December 2012

In order to solve the problems of common metallic membrane coupling which is easily damaged a large misalignment compensation coupling is designed. The coupling joins roller coupling with membrane coupling reasonably to ensure the coupling working well in large misalignment condition. Fatigue stress for common coupling and roller-metallic membrane coupling are analyzed by CosmosWorks software. The results show that the zone around bolt holes is easily damaged due to the high stress and lower safety factor. The design of roller-metallic membrane coupling reduces the high stress and lower safety factor zone to increase the anti-fatigue capability of the coupling.
The Spatial Linkage Analysis and Synthesis of the Vector Fitting Method
Authors: Xu You Liang
Published: December 2012

Put forward a new method of spatial linkage analysis and synthesis of the vector fitting. The core idea is: all components available in mechanisms can be represent by one or one group of vectors, all vectors are transformed from unit vector, and the mechanism is a assemblage of those vectors. Because of kinematic variables (position, direction, changing when moving ) and design variables (shape, size, unchanging when moving ) is been properly separated which can improve the efficiency of analysis and calculation. The example shows that the method is efficient, and can be used both in the analysis and design of the mechanism.
Research on the Door Buckling Strength of Turbine Tower of HAWTs
Authors: Long Kai , Wu Ji Xiu
Published: December 2012

In order to realize the buckling strength design for the opening door of the large-scale horizontal axis wind turbine tower, the method combined with the engineering method and the FEM was presented. The FE model of the door was established. The first-order buckling eigenvalues and buckling modes for three different structures were calculated and analyzed. Based on engineering method, the stress and buckling strength for the sections of tubular tower were obtained. Corrected by FEM results, the tower door with opening buckling strength were checked by engineering method. The results were compared with those by FEM. The safe design structure anti-buckling were presented. The method presented in this paper is feasible and effective for the opening door design in large-scale horizontal axis wind turbine tower.
Development of 4UMS-2700 Cassava Harvester
Authors: Huang Hui , Cui Zhen De , Xue Zhong , Zhang Yuan
Published: December 2012

This paper describes 4UMS-2700 cassava harvester’s overall structure and working principle, introduces its structural designs and main technical parameters, and explains the methods and basis to design its main working parts’ structures. Field experiments on its prototype was conducted and the experimental results show that the unit was reasonably designed with high productivity, low fuel consumption, and high operating reliability and can meet the agronomic requirements to harvest cassava.
Effect of Polymeric Coupling Agent on Mechanical Properties of Kenaf Fiber / Polystyrene Composites
Authors: Zheng Chen , Xu Yan Yan , Kawai Takahiko , Kuroda Shin-ichi
Published: December 2012

In order to improve the properties and the processability of kenaf fiber (KF) / polystyrene (PS) composites, the newly synthesized polymeric silane coupling agent (CA) was utilized and evaluated. KFs were reacted with CA in the melt system and in the solvent system. The composites reinforced by the modified KF showed enhanced mechanical properties compared with those reinforced by the unmodified KF. The effect was especially remarkable when the KF was modified with CA in the solvent system. As the CA content increases, the surface of KF recovered from the composites showed the higher Si / C ratio indicating the good reaction between KF and CA. The modified composites also showed a remarkable reduction in water uptake rate.
Research on Sag and Phase-Phase Space Change by Installing Interphase Spacers for Transmission Lines
Authors: Lin Qing Hai , Yao Yuan Xi , Tian Lian Bo
Published: December 2012

Installation of inter-phase spacer can effectively protects against line fault caused by conductor galloping, non-synchronous swing and sleet jump etc large amplitude vibration, but sag of the conductor is changed if inter-phase spacer is installed. And installation of initial inter-phase spacer will cause change of inter-phase distance, which cause difficulty of successive installation. The empirical equation can’t accurately analyze change of the inter-phase distance caused during installation of the inter-phase spacer. In this paper, accurate conductor installation inter-phase spacer analysis model is established with non-linear finite element method. Change of the conductor sag after installation of the inter-phase spacer is calculated, and influence on inter-phase distance caused by different installation sequence is analyzed. The research result provides effective analysis method for length control of actual line installed inter-phase spacers, and ensures manufacturing and successful installation of the inter-phase spacer.
R&D of Equipment for Deicing by Thermal Water-Jet and Mechanical Deicing Method
Authors: Zhou Jian Zhao , Lai Si Wei , Xu Xiao Pan , Chen Yun He , Chu Wei Jun , Gao Ya Ming
Published: December 2012

Determining how to quickly and economically remove the ice on the airport runways, city roads and bridges is becoming a tough problem to keep the traffic flow and safe in the snow and icy weather. In this context, this paper presents a new method that combines thermal deicing method, water-jet cutting technology with mechanical deicing method, based on analyzing the deficiencies of the existing ice removal methods. Then, it introduces the construction of thermal water-jet and mechanical deicing equipment, mainly the design of thermal water-jet device, and presents the experimental results by repeated indoor experiments. The results indicate that the device can perform well in deicing work, and satisfy to the design requirements.
Constraint Optimization of a Novel Flexure System with Two Rotation Freedom Degree
Authors: Lin Sheng , Wang Chun , Zhou Shi Jun
Published: December 2012

A two freedom flexure system is presented. All the constraints are selected in Case 2, type 1 and Case 2, type 2 in FACT chart. The locations of the non-redundant constraints are optimizated by change laws of the three order natural frequency with the position of constraint. All the redundant constraints are selected to increase the add symmetry to the flexure system. Results of Simulation of static calibration dominates that the flexure system is decoupled. The synthesis process of the two freedom flexure system proposes important reference for design of the flexure system.
Chaos in a Circuit System with Ferroelectric Capacitor
Authors: Qiao Wei
Published: December 2012

Chaos depends on the random parameters are explored in circuit system with ferroelectric capacitor in this article. A random parameter is considered to characterize the random factors in this kind of capacitor. After we reduce the nonlinear circuit system with random parameter into the equivalent deterministic system by orthogonal polynomial approximation, the available effective numerical methods is applied to obtain the responses of the equivalent deterministic circuit system. Then by numerical simulations, we systematically explore the effect of the random parameter on chaos, and find the intensity of random parameter can present the rich and colorful structures of chaotic attractors.
KED Modeling of PLS Mechanism
Authors: Peng Yong , Bai Xiao Xu
Published: December 2012

For the super-size and large flexibility of Pipe Lay-down System, considering the influence on the mechanism from elastic deformation and mechanical vibration during the movements, the kineto-elastodynamics model is established by using the KED theory which is based on the analysis of kinematics. The PLS mechanism is divided into several finite elements. Dynamic equations of beam element are established in the local coordinate by using Lagrange’s equation. In the process of changing from local coordinate into global coordinate, no longer considering the instantaneous structure assumes. In consideration of the first and second derivative of the coordinate transformation matrix versus time are not zero. The mass matrix, damping matrix and stiffness matrix of the final system kinematic differential equation are the function of time. It realizes the continuity of variable in the time domain. Derivation of the results in this paper lays a foundation for the next more accurate and efficient methods being applied to solve the KED equation of PLS mechanism.
Experimental Study on Vibration of Pure Electric Bus
Authors: Li Hui Bin , Yang Man , Liu Ya Ru , Jin De Quan
Published: December 2012

Measurement of vibration signals were conducted in accelerating and constant velocity travelling conditions. By using time domain, frequency domain and 3D spectral array methods, the vibration acceleration of passenger’s seat, power assembly and suspension, the NVH characteristics of the pure electric bus were analyzed. On the one hand, we find that the vibration level of passenger’s seat increase linearly with the travelling speeds. On the other hand, because of the poor isolation rate of the power assembly mount and the chassis suspension, the vibration acceleration on the passengers’ seats are very great and affecting the passengers’ comfort. These experimental results will give help to further study of the NVH characteristic of the pure electrical bus.
Study of the Impact Toughness Experiment of SiCp/Al FGM and Numerical Simulation
Authors: Li Jin , Li Liang Yi , Yuan Zheng
Published: December 2012

This paper by cold isostatic pressing and sintering of combining the method of preparation of silicon carbide enhance aluminum functional gradient materials, and the microstructure, density, impact toughness are analyzed, the results of experiments showed that in the aluminum gradient to join in the silicon carbide enhance particles, The impact toughness of the material has been obviously improved. Using ANSYS Numerical simulation Impact process, the simulation results anastomosis with the experimental results.
The Temporal Diffraction Characteristic of a Femtosecond Laser Pulse by a Serrated Aperture
Authors: Wang Huai Sheng
Published: December 2012

Based on Fresnel diffraction theory we give out the light field distribution for the definite frequency component of a femtosecond laser pulse when the laser pulse passes through a serrated aperture. Through an inverse Fourier transformation, we get the temporal diffraction field function of the femtosecond laser pulse at any distance. The temporal diffraction field function is related to the width of the laser pulse, the structure of the serrated aperture, the Fresnel number at central frequency and time. Number calculation shows when the width of the laser pulse is within a few tens of femtoseconds and Fresnel number at central frequency is much, the temporal diffraction intensity is not a Gaussian distribution. Nevertheless when Fresnel number at central frequency is less than ten, the temporal diffraction intensity can be approximately regarded as a Gaussian distribution and has a time delay effect.
Design on Stepping Type Heating Furnace Control System
Authors: Wang Yan , Liu Cheng Lin , Lu Bin , Pei Meng Xia
Published: December 2012

This paper introduces design and implementation of a kind of stepping type heating furnace automatic control system. In this system, the instrument collects variables of all kinds of process, and then put into PLC, PLC drives corresponding actuator respectively according to the setting control mode and control target value. The requirements of this design are that the control system can control temperature accurately in high temperature environment, in order to realize the furnace temperature uniformity and achieve the requirements of higher-level processing as well as improve the system stability and save energy.
Inverted Pendulum System Modeling and Fuzzy Neural Networks Control
Authors: Yu Hao
Published: December 2012

Inverted pendulum on a cart poses a challenging control problem. It seems to have been one of attractive tools for testing linear and nonlinear control laws. In this paper, we adopt PID and the adaptive neural network based fuzzy inference method to control the inverted pendulum, combined the fuzzy control into the neural control. This method can improve the capability of the fuzzy controller through learning the data of PID controller to train the fuzzy controller. When the model parameters were changed, the adaptive neural network based fuzzy inference system had good adopt ability to anti-interfere. The cart can go to the destine position exactly.
The Error Analysis and Compensation of Two-Dimensional Precision Positioning Platform
Authors: Zhu Mu Cheng , Luo Xian Peng , Wang Ya Ping
Published: December 2012

Through measuring and analyzing the location error of two-dimensional precision positioning system based on the motion control card, and according to the deficiency of the first error compensation, a strategy that enhance addition based on first error compensation was put forward. That using closed loop control to compensate and correct the location error makes the positioning accuracy improved obviously, and achieves an ideal compensation effect. Under the loading conditions, X axial positioning accuracy reached 11μm, Y axial positioning accuracy reached 10μm.
Machine Vision-Aided Quality Decision System for Solder Joint Defect Evaluation
Authors: Wang Chien Chih
Published: December 2012

To improve the printed circuit board (PCB) manufacturing process, it is important to have an automatic inspection system that classifies information regarding defects in solder joints. This paper proposes a quality decision system for solder joint defect classification on a PCB. An experiment was conducted to demonstrate the application of the system. The results showed that the inspection accuracy reached 94%, which is superior to the results achieved by other methods. The results of this study provide an effective solution for the inspection of the solder joint quality.
Research on the Forward Kinematics of Stewart Platform Using Memetic Algorithms
Authors: Zhang Yu Hui , Guan Li Wen , Wang Li Ping , Hua Yong Zhi
Published: December 2012

The forward kinematics analysis of parallel manipulator is a difficult issue, which has been studied by many researchers recently. In this paper, in order to solve the difficult issue, a new computing method with higher calculation accuracy, good operation steadiness and faster speed is mentioned. Firstly, the mathematical model of direct kinematics of the Stewart platform is founded, which is nonlinear equations. Secondly, with the rapid development of artificial intelligence technology, Memetic algorithms (MA) are applied to solve the systems of nonlinear equations more and more, replacing the traditional algorithms. MA is a kind of meta-heuristic algorithm combined genetic algorithms (GA) with local search at the end of iteration. Finally, the validity of this algorithm has been testified by simulating iteration operation. The numerical simulation shows that MA can surely and rapidly get global optimum solution and greatly improve convergence rate. Thereby, MA can be widely used as a general-purpose algorithm for solving the forward kinematics of parallel mechanism.
Research on Capture the Maximum Wind Energy Base on Fuzzy PID Controller
Authors: Liu Ying Ming , Yi En Yong , Wang Xiao Dong , Xie Hong Fang
Published: December 2012

Abstract:This paper studies the control strategy of doubly-fed wind turbine to capture the maximum wind energy.The maximum wind energy capture is a more important part of the wind generation. Due to random fluctuations of the wind speed, to track the maximum power of wind turbine,we need to constantly adjust the speed of the generator, so that the generation run in the optimal tip speed ratio in different wind conditions,in order to achieve maximum power tracking. In this paper, the stator output indirect control the generator speed to achieve maximum wind energy capture,and decoupling control of active power and reactive power can be achieved.the MATLAB / SIMULINK simulation results verify the correctness and feasibility of this method.
Design of Steeping Control System for Corn Wet Milling Process
Authors: Huang En Yao , Wang Dong Tao , Qiu Ya Jun
Published: December 2012

In order to increase starch yield, it is important to adopt counter-current steeping method and control the steeping temperature under limits which is appropriate for corn wet milling process. Firstly, the configuration of steeping temperature control system and steps of counter-current steeping for corn wet milling process is introduced in this paper. Secondly, the hardware design of steeping control system for corn wet milling process is developed. As a part of starch production DCS control system, a C/S structure which using industrial computer as upper computer and using S7-400 PLC as lower computer is adopted. Finally, the steeping temperature control program based on fuzzy-PID control and algorithm of automatic steeping is presented. The real-time operation shows that the control system given by the paper can meet the requirements of corn steeping production.
Control of the Mobile Robot Based on the Mobile-C Mobile Agent
Authors: Ge Wei Min , Li Chuang , Zhang Nan , Wang Xiao Feng
Published: December 2012

This article presents a method of controlling a mobile robot using the Mobile-C mobile gent combined with Ch and details of the Mobile-C’s structure. By the control of Mobile-C mobile agent, the robot can be dynamically switched to new algorithms at runtime to deal with unexpected situations. At last, the distributed application experiments prove the effectiveness of the robot control based upon the Mobile-C mobile agent approach.
Considerations on Designing Artificial Muscle Working at High Pressure
Authors: Wang Li Chao , Wang Xiao Dong
Published: December 2012

Artificial muscle is a new style of actuator with novel working principle, which owns the advantages of compact structure, high power-to-weight ratio, compliance and easy application. Pneumatic artificial muscle (PAM) is usually used in robotics, medical auxiliaries and other small force output occasions nowadays. However, it suffers problems of small power, hysteresis and poor repeatability. A kind of artificial muscle working at high pressure was researched. Different muscle styles are compared and MicKibben structure is selected while fluid media is determined. Furthermore, factors of geometry and material properties, which limit the ultimate pressure, are analyzed. Formulas and simulations verify the influence of limitation and help to calculate key parameters of 18MPa artificial muscle. Data show that it is possible in theory to design high pressure artificial muscle by overall consideration of initial diameter, initial contraction angle and material properties, initial length only influent the stroke.
Experiment and Modeling Study on the Compaction Behavior of Bindered Textile Preforms
Authors: Wu Wang Qing , Jiang Bin Yan , Xie Lei , Ziegmann Gerhard
Published: December 2012

The effect of compaction and preforming parameters on the fiber volume content of bindered textile preforms during a compaction experiment was investigated by using Taguchi method. Four compaction and preforming parameters of compaction temperature, binder activation temperature, binder content and binder activation time were selected and optimized with respect to the fiber volume content at specified compaction pressure (0.2 MPa). The results reveal that the compaction behavior of bindered textile preforms has significantly influenced due to the presence of binder. The fiber volume content during compaction was correlated with the compaction and preforming parameters using a modified four-parameter-compaction-model which has been proposed for describing the compaction behavior of bindered textile preforms.
Application of FMECA Method to Improve the Reliability of a CNC System
Authors: Nguyen Tien Long , Wang Yi Qiang , Zhang Er Hu
Published: December 2012

Based on the failure data of the CNC system in two years, the failure positions, failure modes, failure causes, failure sources of the CNC system hardware and software were analyzed. The more failure positions were analyzed further by FMECA method, proposing content, key point and method which should be paid attention to while using and maintaining the CNC system. The weak parts and its correlative components were also pointed out, so as to provide the basis for improving the reliability of the CNC system hardware and software.
Preparation and Characterization of Fe3+-Doped TiO2/Diatomite Composite
Authors: Sun Lu , Lin Jun Xiong , Wang Lan , Song Kai Xin
Published: December 2012

Fe3+-doped TiO2/diatomite composite photocatalyst were prepared by sol-gel method with titanium isopropoxide used as precursor material. The samples were characterized by SEM, XRD, XPS, BET surface area analysis and UV-Vis techniques. The results showed that the optimum concentration of Fe3+ in the composite catalyst was 0.2wt% when the quantity of TiO2 loaded on the diatomite was 30.3wt%. Compared with the un-doped photocatalyst, the Fe3+-doped sample exhibited red shifts of absorption edge and significant enhancement of light absorption at 400～600 nm.
Modal Analysis and Design of a Vertically Movable Gate Field Effect Transistor (VMGFET) Proposed for Low-Frequency Sensing Applications
Authors: Williams Justin , Forfang William B.D. , You Byoung Hee , Song In Hyouk
Published: December 2012

The objective of this study is to design and optimize a vertically movable gate field effect transistor (VMGFET) - suitable for low-frequency, high-sensitivity applications - with an emphasis on modal analysis of the suspended gate structure, optimization of mesh density within the employed finite element analysis software, and optimization of the moveable gate dimensions given its relationship with fabrication complexity and the structure’s resonant frequencies. The methods of design, optimization, and analysis were carried out with COMSOL Multiphysics 4.2a under the assumption of no damping with free vibrations. The results indicate optimal dimensions of the suspended gate structure - given constraints on size, resonance, and fabrication complexity - which suggest a beam thickness of 3 µm and a beam width of 15 µm, yielding an upper limit of input force frequencies near 2 kHz.
Influence of Sensitive Cavity Structure on the Resolution of Fluidic Gyroscope
Authors: Zhang Bao Li , Piao Lin Hua , Tang Jin , Mei Chuan Zhi
Published: December 2012

The flow distribution of fluidic gyroscope with three different cavities was researched when angular velocity ωi is input. Using Finite element method we calculated two-dimensional flow distribution of fluidic gyroscope with rectangular cavity and two streamlined cavity structures when ωi input. The results show that: with ωi increasing, the fluidic beam centers in three cavities have a more deviation on one side, while in two streamlined cavities it deviates obviously. When ωi is 10rad/s, velocity difference of two thermal wires in streamlined cavity 1 and cavity 2 increase 42.59% and 59.30% respectively compared with rectangular cavity, velocity and y-axial velocity of two thermal wires in streamlined cavity 1 are smaller than rectangular cavity but larger than streamlined cavity 2, but x-axial velocity of two thermal wires in streamlined cavity 1 are smaller than other two cavities, and so is ωi = 15rad/s. It also shows that velocity difference between two thermal wires in streamlined cavity 1 is larger than others, and temperature difference is larger, which can improve the resolution of fluidic gyroscope. This article has laid a theoretical foundation to further enhance performance of fluidic gyroscopes.
Influence of Thermal Wires Position on Fluidic Gyroscope with Different Cavities
Authors: Zhang Bao Li , Piao Lin Hua , Tang Jin , Mei Chuan Zhi
Published: December 2012

The influence of thermal wires position on resolution of fluidic gyroscope with three different cavities was researched. Using Finite element method we calculated two-dimensional flow distribution of fluidic gyroscope with rectangular cavity and two streamlined cavities when the thermal wires are in different positions. As the results shown: define d is the distance between thermal wires and the nozzle along the fluidic beam propagation direction, when d ≥ 13mm, velocity 4SSUM in streamlined cavity 1 is bigger than velocity 2SSUM in streamlined cavity 2. When d >16mm, velocity SX of two streamlined cavities decrease faster than RX of rectangular cavity, which reduce the vortex phenomena in cavity. With the distance away from the center axis of cavity increases, the velocity gradient increases, and increasing the distance between two thermal wires within a certain range can increase velocity difference of two when angular velocity ωi inputs, temperature difference increases, so it increases the resolution of fluidic gyroscopes. This paper has an instructional role on structure optimization and performance improvement of fluidic gyroscopes.
The Application of Modern Electronic Technology to Automotive Engine
Authors: Xing Qian
Published: December 2012

Electronic technology is widely applied in modern automobiles, making automobiles safer, more comfortable, economical and environment-friendly. With the development of automobile industry, electronic technology occupies an increasingly large portion within auto industry technology. To some extent, electronic technology gave rise to the revolution of environment-friendly automotive technology. This article expounds on principles of the automobile engine electronic control system as well as other applications of electronic technology to automobiles. Hopefully, readers could attain certain knowledge concerning the relationship between modern automobiles and electronic technology.
Design and Implementation of LED Display Screen Controller Based on STM32 and FPGA
Authors: Zhang Chi , Wu Xiao Guang , Zhang Cheng Jun
Published: December 2012

In order to realize point-light-source and hurdle lamp LED displays system, a kind of LED display screen controller design based on FPGA and STM32 is introduced by this paper. This design can quickly and easily receive display the data from USB, Ethernet and SD card interfaces through the STM32 processor, and use FPGA to realize data transmission throughput big operation of stable display by double RAM Ping-Pong operation This paper gives drive unit timing for TM1809 series LED drive chip as typical case. This design has applied to LED display controller with stability of reading data and excellent performance.