bluuebunny/crossref_metadata_2025 huggingface dataset:
Modeling of Heat Transfer in Spent-Nuclear-Fuel Container during Forced-Chilling Process
Authors: Wang Li Ping , Liu Dong Rong , Guo Er Jun
Published: July 2011

Application of spheroidal graphite cast iron in the production of spent-nuclear-fuel container contributes to improve the strength and toughness of the casting, because of the nodular shape of graphite. For a large-scale container, a forced-chilling technique is used to accelerate solidification process and raise spheroidization rate. In this paper, modeling of heat transfer in the container is performed. Influences of cooling media, inflow flux of coolant and thickness of sand layer upon the variations of cooling rate are systematically analyzed. Calculated results indicate that water as a coolant is more capable of enhancing the cooling course than air. Increasing inflow flux conducts an effective cooling job, whose influence is more apparent for air-cooling than for water-cooling. The role of decreasing the thickness of sand layer is most pronounced for raising solidification rate. The predicted cooling curves are compared with experimental measurements to validate the model.
The MultiAgent Forming Stress Analysis and Design of Cold Bending Centre Sill
Authors: Li Guo Chang
Published: July 2011

By means of analyzes the differences of mechanical properties between railway wagon with cold bending centre sill steel and common cold-formed steel, to study the differences resilience by different materials, final this given the forming principle and molding pass of cold bending centre sill. Analysis the stress state of the forming process of cold bending centre sill with multiAgent technology, establish corresponding Agent force model. In determining the basis of forming passes, then determining the deformation per passes and the amount of bended, furthermore realized the forming process of virtual in computer.
Finite Element Analysis and Structural Improvement of S195 Diesel Engine Connecting Rod
Authors: Zheng Bin , Liu Yong Qi , Liu Rui Xiang , Meng Jian
Published: July 2011

In this paper, with the ANSYS, stress distribution and safety factor of connecting rod were analyzed by using 3D finite element method. The results show that the oil-hole of small end and medial surface of connecting rod shank are the exposed destructive positions at maximum compression condition. Maximum stress value is 214 MPa. Safety factor is 1.64. The oil-hole of small end and the transition location of small end are the exposed destructive positions at maximum stretch condition. Maximum stress value is 97.2MPa. Safety factor is 3.63. Based on the analysis, the structure of connecting rod is improved. Safety factor of connecting rod increase.
Finite Element Analysis and Structural Improvement of Farm Engine Connecting Rod
Authors: Zheng Bin , Liu Yong Qi , Liu Rui Xiang , Meng Jian
Published: July 2011

In this paper, with the ANSYS, stress distribution and safety factor of connecting rod were analyzed by using 3D finite element method. The results show that the exposed destructive position is the transition location of big end and connecting rod shank at maximum compression condition and maximum stretch condition. Maximum stress is 353MPa. Safety factor is 2.22. Maximum deformation is 0.0728mm. Based on the analysis, the structure of connecting rod is improved. Safety factor of connecting rod increase 12%.
3D Design on Eddy Current Retarder
Authors: Chen De Yang , Yi Feng Yan
Published: July 2011

This paper introduces the structure and working principle of the eddy current retarder , the design method of the eddy current retarder is proposed: the design of structure parameters including of the rotor windings and the excitation of eddy current retarder are completed, and on this basis 3D design of the eddy current retarder is completed by using UG software.
The Structure Design and Analysis of Predigest Laser Combine Bind and Extend Bind Flat Roof
Authors: Han Xu Dong , Wang Bing , Shi Kui , Liu Chang Shun , Wang Heng Kun , Chen Zhao Bing
Published: July 2011

This paper put forward a kind of predigest laser combine bind and extend bind flat roof structure, which is founded as fission flat roof, and can be built in an little room 1280mm×990mm×815mm. This flat roof space location can be adjusted. This kind of seat can ensure the system complete laser combine and close as high precision. In this paper we designed the laser combine and close whole structure and install design. At last we did some finite statics analysis to some important parts. This design can ensure every laser fire directional adjust mete lower ±30′, and the flat roof quality is 770kg. The transition benchmark flat roof system most meet and emergency is 0.005mm at the premise of bear the weight of turn flat laden. It can be seen that this structure can satisfy the request of many lasers small space laser extend bind and adjust. This kind can be extended to other light combine bind and extend bind structure design.
The Design of Moving Mongolia Yurt
Authors: Jin Hong Yan , Zhu Zhi Wei
Published: July 2011

The form and structure of Mongolia yurts reflect the quantity relationship beauty, the function beauty and nature harmonious beauty. But in the present, there also exist some problems of making and using. This paper has made some improvements on its material and components on the basis of keeping the traditional appearance and comfort. This new design makes its building more conveniently, living in it more comfortablely by adopting modern high technology and new materials, and also makes it stronger, lighter, and more beautiful. And the completed yurt and trailer united perfectly, so that it may have better moving property.
Dynamic Analysis on Steel Tower of Vertical Axis Wind Turbine
Authors: Si Jia Jun , Zhu Kuan Jun , Liu Bin , Ding Yao
Published: July 2011

The dynamic analysis has been adopted for the calculation of the low-order natural frequency and harmonic response data of the steel tower of vertical axis wind turbine, as well as the dynamic relation between the wind turbine and the tower. When the wheel rotates at 160rpm, the harmonic load has a very serious destructive damage to the tower. In order to avoid the system failure caused by the system resonance in the engineering design, some optimizations have been taken on satisfying the security and reliability of the tower. This study provides the scientific basis for the dynamic design and the optimization. The conclusion shows that the most effective method of raising the natural frequency is to reduce the weight of the structure when the material and the structural style are determined. As a result, the difference between harmonic response and resonance frequency of the structure rises to 21.3％ from 0.3％ after reducing the weight of the tower by 21.3％.
The Project Research for Optimal Scheduling Based on Particle Swarm Optimization
Authors: Fengshan Pan , Ye Chun Ming , Jin Chao , Kou Ming Shun
Published: July 2011

The project management optimization for an important aspect of the scheduling scheme is reasonable to reduce costs, improve quality and shorten the cycle. Traditional project scheduling and optimization methods have been unable to fully meet the rapid development of modern project management needs. The PSO (Particle Swarm Optimization) is a simulation of birds the heuristic search algorithm mechanisms, which function optimization, constrained optimization, minimax problems, such as multi-objective optimization problem. It has become an important branch of the many related optimization fields. Although the project is to optimize the scheduling, many traditional methods can achieve good results, but the particle swarm algorithm can achieve a greater degree of optimization. In this paper, research on the particle swarm optimization of the basic principles of their algorithm for the initial exploration process, compared the effectiveness simulation of particle swarm optimization and traditional genetic algorithm in optimal scheduling of the project . Therefore, the original project plan with the optimal scheduling on the basis of introduction of particle swarm optimization algorithm can get better quality, shorter cycle and fewer costs, and ultimately get the entire optimal project cycle, project quality and project cost.
An Effective Resolution Algorithm for the Two Dimensional Bin Packing Problem
Authors: Zhou Yu Yu , Rao Yun Qing , Zhang Chao Yong , Zhang Guo Jun
Published: July 2011

We address a two dimensional bin packing problem in this paper. Firstly, we adopt and improve bottom left placement method, which is presented as bottom left corner-occupying (BLCO). Secondly, borrowing from the respective advantages of the two algorithms, a hybrid of genetic algorithm (GA) and tabu search (TS), is developed to solve the problem. Thirdly, using a new neighborhood structure combined with the appropriate move evaluation strategy, we propose TS to re-intensify search from the promising solutions. The hybrid GATS is tested on a set of instances taken from the literature and the computation results validate the quality of the solutions.
Structural Optimization on the Hydraulic Press by FEM and Mathematical Programming Algorithm
Authors: Xu Wu Jiao , Chen Ke Wei , Ding Yong Feng
Published: July 2011

Structure strength and deformation of the preliminary hydraulic press design have been calculated by the finite element method, in which two working conditions have been considered, i.e. the centre-point load condition and the eccentric load condition. To solve the surplus structure strength globally and the localized stress concentration, the combined methodology of mathematical programming algorithm and the FEM has been utilized to redesign the hydraulic press. The optimization result shows that the mass of the press has been reduced greatly and the localized stress concentration has been eliminated. Besides that, the strength and stiffness in the optimized structure still meet the performance requirements.
The Extractive Technique of Active Constituent in Six Insecticidal Plants
Authors: Wang Hui , Ma Ling , Ma Wei
Published: July 2011

In this study, the soakage extraction method and the ultrasonic extraction method were used to extract active ingredients from Artemisia annua, Artemisia sieversiana, Artemisia mongolica，Artemisia scoparia, Artemisia lavandulaefolia and Artemisia japonica. Using the orthogonal experiment design, we studied the effects of four factors: extraction time, solid-liquid ratio, fineness and extraction times, on extracting active ingredients from Artemisia annua. We also optimized the extraction conditions of the ultrasonic wave method. The results showed that 95% ethanol solution was the best solvent for extracting components in these six species of Artemisia. The best extraction method was ultrasonic extraction method. The optimum extraction conditions of ultrasonic extraction were 1:20 of solid-liquid ratio, one time of extraction, 40 of degree of fineness and 40 minutes of extraction time.
Research on Simulation Technology for Auto Panel in Drawing Forming Based on Autoform
Authors: Liu Xi Fen , Hu Yi Hua , Huang Wei Jian
Published: July 2011

The features and functions of Autoform software for sheet metal forming simulation were introduced. Taking the auto panel as an example, based on UG and Autoform, the process of CAE simulation analysis on the drawing process was stated in this paper and the simulation results were analyzed. The results of analyses indicated that the crack tendency was in the two salient of auto panel flange in the drawing process. By optimizing and adjusting the parameters of mold, the problem of crack tendency was solved. The optimal stamping process was finally determined based on the results of the simulation. Compared with the traditional stamping technology and die designing, the quality of die designing was improved by adopting CAE technique.
Analysis of Flameproof Diesel Performance
Authors: Li Bao Lin , Fan Jiang Peng , Zhang Yan
Published: July 2011

Engine bench scale test was performed to compare the existing flameproof diesel to the general diesel engine, monitor the change of power, torque and smoke in the fixed revolving speed, process the data, and then compare and analyze the flameproof diesel performance, put forward the improved blue print and conduct the experimental comparison. At last, data basis will be provided for the flame-proof diesel researching and designing.
Three Dimensional Thermo-Mechanical Model of Different Thermocouple Embedded Modes Analysis
Authors: Sun Li Gen , Zhang Jia Quan
Published: July 2011

The embedded thermocouples have been analyzed with the consideration of their temperature effectiveness and the life of mould plates. Three dimensional FEM models have been adopted to study the effect of different installation of the thermocouples. The thermocouples installation methods, whatever from the back side of the plates or from the top or bottom, have been observed with little effect on the temperature field of the copper plates. But the effective Mises stress and strain are influenced obviously. The maximum stresses have been observed in the area of thermocouples channel with holes from back side of the plates. From this point of view, the holes from top or bottom of the plates are more reasonable.
Computation and Analysis of Disk-Type Magneto-Rheological Fluids Brake
Authors: Yi Feng Yan , Liu Cheng Ye
Published: July 2011

On the basis of analyzing the structure and working principle of MRF brake, braking torque calculation formula of two disc MRF brake is established. Dynamic yield stress changing with the applied magnetic field is analyzed. Braking torque generated by MRF’s viscous changing with disk rotation velocity is also analyzed when magnetic field is zero. Furthermore; braking torque changing with magnetic field intensity is analyzed under a certain rotation velocity. The study provides a theoretical basis for MRF design.
New Locating Method of Spatial Target with 3-R Range-Only
Authors: Liu Jin Mang , Yang Wan Hai , Yang Jin Long , Liu Yong Lan
Published: July 2011

Based on the geometric relationship of the tetrahedron, 3-R target location theorem and calculation principle are given, and analytical model of locating built on distances between three stations and the target is put forward. In theory, we analyze its location precision and present its emulation about the precision. Besides, we give an analysis of some application examples on radar network and target tracking. This method is convenient to operate and easy to implement, without variable coupling.
Numerical Simulation and Test Research of Continuous Flexible Forming Process for the Spherical Parts
Authors: Lan Ying Wu , Cai Zhong Yi , Li Ming Zhe
Published: July 2011

The deformation of sheet metal in the continuous flexible forming (CFF) process is complex and the formed result is affected by many factors. In this paper, the finite element model of CFF was founded and the forming processes of spherical parts were simulated with the software ABAQUS. The interaction between transversal deformation and longitudinal deformation in the CFF process is analyzed. Based on results of numerical simulation and forming tests, the process parameters of CFF is revised, and formed surface is measured by three dimensional sensing system, the measured results indicate the precision of formed parts are satisfactory.
The Research on Snake-Like Robot Design Based on Single Chip Microprocessor
Authors: Song Tian Lin , Li Zhi Yao
Published: July 2011

This paper introduces a three-dimensional snake-like robot based on AT89C2051 microcontroller. The structure which consists of relatively independent units composed of joints can achieve simple way of serpentine motility, peristaltic movement and three-dimensional complex movement by combining these two methods. For this feature, the system could well simulate the snake activity. The control system realizes the motion of snake-like robot through controlling each joint angle of servo by microprocessor.
Multi-Class SVMs Based on Priority for Computer-Aided Diagnosis of Lung Nodules in CT Images
Authors: Wang Qing Zhu , Wang Xin Zhu , Bie Ji Song , Wang Bin
Published: July 2011

A priority based ‘One against all (OAA)’ Multi-class Least Square-Support Vector Machines is designed to remove the unclassifiable regions exist in basic OAA. POAA develops the sensitivity and specificity in Computer-aided Diagnosis (CAD) for detection of lung nodules.
Study on the Soil Slope Stability Based on the Support Vector Machine
Authors: Wang Yun Fei , Wang Li Ping , Zhong Fu Ping , Chu Huai Bao
Published: July 2011

The stability of the slope is a complex system affected by many factors, with the characteristics of randomness and fuzziness. In the paper established the model of the support vector machine, which make use of the support vector machine considering the multiple factors affected the slope stability, and select the indicators with the characteristic of common and easy access. Through the actual inspection verified the validity of the model, shows that the model can be well applied to the analysis of slope stability with similarity, it may provide an important basis for the slope project construction.
Robust Control of Variable Pitch Wind Turbines Base on Linear Matrix Inequality
Authors: Qin Lu Fang , Sun Tao , Guo Hua Feng
Published: July 2011

In order to solve the problems of wind power generation system model uncertainty, we designed a robust tracking controller according to the robust control theories and the method of linear matrix inequality (LMI). For ensuring the stability and dynamic characteristics of robust, we gave the calculating method of proportion and integral gains, researched the robust control strategy with pole constraint that is based on minimal power tracking controller. The results of the simulation show the controller can realize the steady close-loop and possess good disturbance rejection and dynamic characteristic in some disturbances and uncertainties existed in system.
A Maximum Power Point Tracking Algorithm Based on Fuzzy Neural Networks for Grid-Connected Photovoltaic System
Authors: Su Hai Bin , Cheng Zhi Chong
Published: July 2011

This paper proposes a algorithm of maximum power point tracking using fuzzy Neural Networks for grid-connected photovoltaic systems. The system is composed of a VSI converter, the maximum power point tracking algorithm based on fuzzy Neural Networks outputs a reference voltage as voltage loop import variable. The voltage controller outputs a reference current to control inverter output current in side grid. The fuzzy Neural Networks provide attractive features such as fast response, good performance. Therefore, the system is able to deliver energy to grid. This proposed algorithm is simulated and implemented to evaluate performance. From the simulation and experimental results, the fuzzy Neural Networks can deliver more power than the other algorithm.
Experiment Research on Control Method and Mathematic Models during Energy Storage to the Double Function Flywheel System
Authors: Liu Zhi Hua , Li Yan Min , Wang Chun Li
Published: July 2011

The mathematical models of the double function flywheel system were built based on experimental tests and theoretical analysis in the course of energy storage and attitude control. Due to significant changes of the system model parameters in the experiment, the difference between the up and down flywheel-electrical machinery unit are compensated through the cascade compensation, and then the PID compound control algorithm with integral separation and formula partition is put forward. Experiments show that overshoot is restrained effectively and stable control is realized in high speed and wide range synchronously. The angel of the platform can be stabilized within 1°, namely the attitude affection should be controlled less than 1.2′ according to the flywheels in satellite.
The Study of the Dynamic Testing System of Modern Measurement and Monitoring Platform
Authors: Chen Yu , Xu De Zhang
Published: July 2011

The test system we discussed is made up of a personal computer, hard wares with various functions, graphical interfaces application software Lab Windows/CVI which is used to data analysis and process communication. It mades the computer to be a numeral platform with various test functions. Making use of the software Lab Windows/CVI, various instrument panels are generated. Data could be done with, expressed, transformed, stored, and displayed on these panels.
Design and Research of PMSM Control System Based on FPGA
Authors: Qi Hui , Gong Chang Sheng
Published: July 2011

In order to improve the real-time and stability of Permanent Magnet Synchronous Motor(PMSM) controller system, and to realize the integrated control of PMSM driving system and regenerative braking system, in this paper, the PMSM controller using FPGA as the central processor is designed, which is based on the PMSM vector control principle. Firstly, PMSM driving and regenerative braking model are analyzed; and then the design method and timing waveforms for PMSM control based on FPGA are described. Results of PMSM driving experiment and PMSM regenerative braking experiment have shown that the performance of PMSM controller system based on FPGA is much better
Analyses of Influencing Factors of Pore Formation during Resistance Spot Welding of Magnesium Alloy
Authors: Tu Yi Min , Qiu Ran Feng , Shi Hong Xin , Yu Hua , Zhang Ke Ke
Published: July 2011

In order to obtain better understanding of the resistance spot weldability of magnesium alloy and provide some foundational information for improving mechanical properties of the magnesium alloy joint, the influencing factors of pore formation during resistance spot welding of magnesium alloy, such as preexisting pores in base material, hydrogen rejection, shrinkage strain and expulsion, were analyzed; the corresponding restraining measures were discussed. The analyses reveal that the shrinkage strain and expulsion are important factors in contributing to the formation of pores during resistance spot welding of magnesium alloy, and that the pore formation could be suppressed by adjusting welding parameters.
Electrochemical Hydrogen Storage Characteristics of (Mg1-XZrX)2Ni (x = 0 - 0.3) Alloys Prepared by Mechanical Alloying
Authors: Zhang Yang Huan , Hou Zhong Hui , Guo Shi Hai , Zhang Guo Fang , Li Xia , Zhao Dong Liang
Published: July 2011

The electrode alloys (Mg1-xZrx)2Ni (x = 0, 0.3) were prepared by mechanical alloying (MA). Mg in the alloy was partially substituted by Zr in order to improve the electrochemical hydrogen storage characteristics of the Mg2Ni-type alloy. The effects of substituting Mg with Zr as well as milling duration on the microstructures and electrochemical performances of the alloys were investigated in detail. The results showed that the substitution of Zr facilitates the formation of amorphous Mg2Ni-type phase. The electrochemical measurement indicated that the substitution of Zr significantly enhances the discharge capacity and cycle stability of the alloys, and it markedly improved the discharge potential characteristic of the alloys. For a fixed alloy, the electrochemical performances, including the cycle stability and the discharge voltage characteristic as well as discharge capacity, of the alloys were markedly improved with prolonging of the ball-milling duration.
A Non-Destructive and Effective Metrology to Automatically Monitor Kink Effect of MOSFETs
Authors: Wang Mu Chun , Yang Hsin Chia
Published: July 2011

The kink effect is a harassed issue existing in metal-oxide-semiconductor field-effect transistors (MOSFETs) and usually degrades the whole chip performance, especially in analog circuit operation. No matter what the device isolation is with local oxidation of silicon (LOCOS) process or shallow trench isolation (STI) process, this effect more or less depicts. How to sense this effect in integrated-circuit (IC) mass-production is a crucial event. Through a second derivative method on Ids versus Vgs curves in MOSFET device, the unhealthy devices can be effectively screened out with the application of programmable auto testers. Using this derivative metrology implemented into the measurement testers, the distribution of kink devices on wafer is easily plotted. This information is very precious to the semiconductor process engineers in process improvement, too.
A Kinetic Model for Cassava Starch Hydrolysis under Cold Enzyme Two-Stage Hydrolysis Condition
Authors: Bao Ying Ling , Chen Li , Wang Hong Lin , Yan Zong Cheng
Published: July 2011

A suitable starch hydrolysis strategy is crucial for conversion of starch into fermentable sugar, both with regard to reducing hydrolysis cost and increasing hydrolysis efficiency. A mathematical model for starch hydrolysis has been developed to predict sugar released curves based on experimental data from starch cold enzyme hydrolysis. At the first part of cold enzyme hydrolysis, starch was hydrolyzed by α-amylase (EC 3.2.1.1) and conversion into dextrin and glucose. Secondly, the residual starch and dextrin were second hydrolysis by glucoamylase (EC 3.2.1.3) into glucose. Fitting of experimental data was made by non-linear regression. Parameters values calculate were obtain from previous studies or experiments. Though mathematic formulation, the kinetic model was able to fit experiment with very good agreement. This model can be used for simulation of the industrial process and for faults detection. It can also be utilized for the optimization and even for the supervised control of the process.
The Recognition of Target and Attitude of Bucket for Excavator Robot Based on Color Mark Tracking
Authors: Wang Fu Bin , Liu Jie , Jiao Chun Wang , Chen Zhi Kun
Published: July 2011

The excavator robot need to track bucket goal and its attitude real-time and dynamically during it’s autonomous mining. On the basis of analyzing basic action of mining operations, collected sequence image of mining process of bucket. To reduce the effect of light environment to image processing, use the target tracking method based on color characteristics to recognize color mark block. The bucket attitude angle can be recognized according to the mark of angle attitude of bucket; the bucket target can be recognized according to the mark block of bucket target. Due to sheltered phenomenon, use stripe color block to recognize bucket target while mining process. The color mark block resolve the target tracking problem for bucket, but also fussing the information of pressure sensor of bucket, thus establishing the foundation for subsequent realization based on behavior of autonomous mining.
The Improvement of PID Control Based on Programming Transition Process
Authors: Zhang Zhao Qiang , Zhu Xiao Min , Li Jun Yang
Published: July 2011

PID controller has already been applied widely, but it is difficult to meet the requirement of both static and dynamic performance, which makes PID running without efficiency. Through programming transition process, the paper designs the rationality of given signals in the whole process and introduces an auxiliary application of differential signals, which can realize the control goal in programming control process and make the control key change from confirming the transition of system model to estimating the constant time of system roughly, and the control effect has been improved evidently. By analyzing MATLAB simulation, the paper verifies that the algorithm is reasonable and prevalent.
Rapid Manufacturing Technique of Casting Mould Based on the SLS
Authors: Zhang Hong Feng , Chang Wei Hang
Published: July 2011

Selective laser sintering (SLS) is one of relatively mature rapid prototyping technologies at present day. This paper takes the forming of a high voltage switch casting model in the AFS-3000 rapid prototyping system as example to describe the forming process of SLS, and introduce the casting model rapid prototyping technology based on SLS. This research provides a powerful technological support for rapid development of casting products.
Singular Problem and Improved Plane Interpolation Algorithm
Authors: Shen Bin , Qi Dang Jin , Fan Liu Qun , Zhu Zhi Hao
Published: July 2011

In the 5-axis machining, when the tool orientation approaches the one of the rotation axis, the sharp changing of the rotation angles obtained by the transforming of tool orientations causes a large over cutting or under cutting for the limit of the machine’s dynamic characteristic, which is called singular problem. After analyzing the causing of the singular problem, the position of singular point, the singular value and the nonlinear error, etc, an improved plane interpolation algorithm based on plane interpolation of tool orientation algorithm is given out in the paper following with the simulation and test of the circumference milling of the tilt plane (tilt angle: 1°) separately with the plane interpolation and improved plane interpolation based on a 5-axis machining center with two swiveling heads (rotation axes: C/A). The results prove that the new interpolation is valid and correct.
Verification of Surface Finish as an Indicator of Machinability in Turning Steel X6Cr16Ni10MoTiN
Authors: Jurko Jozef
Published: July 2011

This paper presents the conclusions of machinability tests on a new austenitic stainless steel X6Cr16Ni10MoTiN, which applicated in food processing industry, and describes important concurrent parameters for the cutting zone during the process of turning. The content of this article also focuses on the analysis of selected basic indicators of steel machinability: quality of the processed surface. The results of the article are conclusions for working theory and practice for turning of austenitic stainless steels. Based on the cutting tests, cutting speeds of 60 to 220 m/min, feed rate of 0.06 to 1.2 mm and solid carbide indexable insert CNMG 160404-MF.
Study on Machining and Measurement for Borosilicate Glass Conical Ellipsoid
Authors: Zhao Wen Hui , Duan Zhen Yun , Ren Zhong Wei
Published: July 2011

Surfaces formed by rotating quadratic curve are widely applied in engineering practice. After having studied machining methods and machines, the CNC grinding method based on macro program B for borosilicate glass elliptical cone surface machine with high precision is proposed. Within the allowable error, the coordinates are calculated according to the equation of axial section curve and the surface is formed with tools moving on axial section curve. Through setting parameters of the lathe, the new canned cycle can be defined to process all different kinds of the elliptical cone surface of same type. With surface triangle adaptive measurement method, machined elliptical cone surface can be detected on coordinate-measuring machine and compared with the theoretical curve. The tolerance resulted from analysis is within 0.025mm. Except ellipsoidal surface all solids of rotation and their deformation, in which their axial sections are represented with equation, can be processed and measured with this method.
Experimental Verification of Decentralized Approach for Modal Identification Based on Wireless Smart Sensor Network
Authors: Ye Xi Jun , Zhu Tian Feng , Yan Quan Sheng , Wang Wei Feng
Published: July 2011

This paper provides an experimental verification of decentralized approach for modal test and analysis of a 30 meters long railway overpass bridge. 11 Imote2 smart sensor nodes were implemented on the WSSN. In order to compare the identification precision of different topologies, acceleration responses were obtained under centralized and 3 different decentralized topologies. Local modal parameters were estimated by NExT/ERA within each local group; true modes were then distinguished from spurious modes by EMAC and finite-element analysis. In order to estimate global mode shape, a least square method was used for calculating the normalization factor. Then the global mode shapes were determined by normalization factors and local mode shapes. The result demonstrates that the more overlapping nodes in each group, the more accurate the global mode shape will be; the decentralized approach is workable for modal test of large-scale bridge.
In-Mold Rheology Curves with Feedstock and Mold Dimension
Authors: Jang Jin Man , Cha Bermha , Lee Won Sik , Seo Jung Sik , Ko Se Hyun , Son Seong Ho
Published: July 2011

In this work, in-mold rheology curves were generated by injection molding machine and the effects of feedstock and mold dimension on in-mold rheology curve were studied. The rheology within mold in µMIM process depends on the shape and/or size of cavity and process conditions rather than intrinsic viscosity of feedstock. The optimum injection speed was determined in region of Newtonian flow of in-mold rheology curve. The dimensional deviation was below about 5 µm in the micro part injected with the optimum speed.
Development of a HLA/RTI for High Performance Simulation
Authors: Liang Hong Bo , Yao Yi Ping , Mu Xiao Dong
Published: July 2011

High performance simulation has great prospect of application in the fields of Materials Science and Engineering. In high performance simulation, high performance computers are used to improve the performance of simulation. As one of the simulation standards, HLA simulation was greatly applied in computer simulation. In HLA simulation domain, many RTIs are designed to support the simulation in LAN/WAN environment. Because of the general TCP/UDP communication mechanism, high simulation performance can’t be achieved by these software on high performance computer. To improve the simulation performance, a customized RTI software for high performance computer and PC hybrid environment is designed. By using of partially hierarchical design on functional distributed architecture, large scale simulation can be supported. An adaptive communication mechanism is proposed, which can adapt communication between different RTI components to shared memory, Infiniband and Ethernet automatically, thus can greatly improve communication performance. In addition, this paper explains the related design in this customized RTI.
Study of the Effect of Electric Field Distribution to the Pulse Electrochemical Machining
Authors: Li Zhao Long , Di Shi Chun , Wei Dong Bo , Lv Peng Xiang
Published: July 2011

This paper studies the electrochemical machining on the surface of nickel-based alloys with a tubular electrode and analyses the effect of electric field distribution and current distribution to the shape of concave holes during the processing. It is concluded that the maximum distance between the positive and negative poles in the reaction of electrochemical machining. It is analyzed that order of electrochemical machining surface holes in the direction of hole radius and hole depth and the variation laws of reaction speed.
The Vibration Analysis and Modal Experimental Study of High Speed Motorized Spindle
Authors: Meng Jie
Published: July 2011

Vibration testing and modal experiment under the different speed are carried out to the high speed motorized spindle whose maximum speed is 60 000 rpm. Time domain waveform and spectrum of motorized spindle’s radial vibration acceleration are obtained under the unload state. Through calculating and analyzing, the vibration velocity and the testing point which generates the maximum vibration velocity are found out. Then motorized spindle is validated whether it accords with the requirements of high-precision manufacture. And the correctness of the vibration testing method is also verified. Primary reasons of the motorized spindle’s vibration are put forward. The first five steps natural frequencies of motorized spindle test-bed are gained by appropriate ways to checkout if the test-bed in the resonance region.
A Fast Method for Analyzing the Effect of Mask Error on Photolithography Pattern Quality
Authors: Li Mu Jun , Ye Hui Chun , Shen Lian Guan
Published: July 2011

As an important factor the error of mask pattern is often ignored in the lithography simulation model. To investigate the impact of mask errors on the lithographic pattern, effects of how the wave-front on different mask pattern region affects the field points in resist is first introduced, and based on this analysis a method is proposed to quickly judge the affection of round corner error of mask pattern on the photo-resist pattern. By comparing the actual effect area and the effective wave-front area around the corner on mask pattern, the method can illustrate the quantitative relationship between variation in photo-resist pattern and the related mask error. Finally the simulation results are verified by experiments. The study results may contribute to the fast and accurate judgments of error in the lithography, and provide important theoretical basis for lithography error correction.
Study on Constitutive Model of 20CrMnTi Gear Steel in Cutting Process
Authors: Liu Gan Hua , Yan Hong Zhi
Published: July 2011

Flow stress data is important base data in using the analytical method and the finite element method to analyze the metal cutting process.In the present study, a comprehensive method combining with four methods of material mechanics tests, SHTB impact tests, two-dimensional orthogonal slot milling experiments and reverse solving is used to determine constitutive model (flow stress model) as a function of the "three-high" (high strain , temperature and strain rate) in metal cutting. The constitutive model of 20CrMnTi gear steel (hardened to170±5HB) which is one of China’s main gear steels in cutting deformation is established by using this method, and experimental results show that the model’s accuracy is high. Practice has proved that the methodology of constitutive model determination for metal cutting deformation, proposed in the present study, has advantages when compared with using one method alone, and is more suitable to establish flow data for the various materials in the metal cutting process.
Optimization of Deformation Shape of an Active Electro-Optical Focusing Device
Authors: Yuan Ting , Mescheder Ulrich , Kronast Wolfgang , Wang Chang Long
Published: July 2011

Severe deformation which was induced by internal (residual) stress was observed on the MOEMS focusing device without driving voltage. Based on beam suspended membrane, FEM software COMSOL Multiphysics was used to predict the deformation induced by internal stress, model parameters (beam width and length), boundary condition of the chip. Found the parameters which can make the membrane be relative flat initially. Expanded the model including ring shaped electrode, using COMSOL coupled fields(AC/DC-Electrostatics module, Structural Mechanics-Solid Mechanics module and Mathematics-Deformed Mesh-Moving Mesh module), found the inner radius of ring shaped electrode which can get perfect parabolic shape of membrane with large maximum relative deflection under driving voltage.
Performance of Surface Carrier Mobility for Nano-Node Strained (110) MOSFETs with Temperature Effect
Authors: Wang Mu Chun , Yang Hsin Chia , Liao Wen Shiang
Published: July 2011

Considering the increase of the driving current for nano-node MOSFET devices, source/drain (S/D) site etched and refilled with SiGe material is a promising process to promote the channel mobility due to the tensile or compressive effect. Using SiGe-S/D process comparing the performance with Si-S/D and control devices on (110) wafer to probe the nano-scale mass-production possibility is a good integration. Besides the discussion in the room temperature, the device characteristics with temperature dependence are more impressive. Through analysis for the cumulated data, the temperature impact in the performance of long channel MOSFETs is higher than that in the short channel ones. The phenomena can be attributed to the tensile or compressive effect to n- or p-MOSFETs with phonon scattering disturbance.
Design, Fabrication and Analysis of Microrobotic Insect Wings and Thorax with Different Materials by MEMS Technology
Authors: Chi Peng Cheng , Zhang Wei Ping , Chen Wen Yuan , Li Hong Yi , Meng Kun
Published: July 2011

This paper presents a feasibility step in the development of biomimetic microrobotic insects. Advanced engineering technologies available for applications such as the micro-electro-mechanical system (MEMS) technologies are used. A flapping-wing flying MEMS concept and design inspired from insects is first described. Then different kinds of materials used feasibly for flapping-wing microrobotic insect by MEMS technology, such as SU-8, Titanium alloy and Parylene-C, are discussed. And artificial insect wings and thoraxs with different materials by MEMS Technology are fabricated and analyzed. Finally, summarize the paper and propose future research priorities.
The Theory Based on the Displacement of Mass of MEMS Gyroscope Used in Spinning Projectiles Analysis and Simulation
Authors: Cui Xing , Zhang Xiao Ming , Chen Guo Bin , Li Yong Hui , Liu Jun
Published: July 2011

The MEMS gyroscope used in Spinning Projectiles is a single-chip and axis gyroscope drive by high-speed rotary of Spinning Projectiles. To analysis this theory, a corresponding mathematical module was established based on the structural principle of the gyroscope and the Kinetic parameters included in the mathematical module was analyzed and calculation. By calculation, the paper had drawn the curve between the displacement of mass and the input angular velocity. By using ANSYS software the vibration mode and harmonic response have been done, after comparing the results of imitation and calculation, it is found that the difference is little, so the theory based on the displacement of mass is correct.
The Profit and Loss Accounting Method to Propel the Management of the Key Customer in the Coach Industry
Authors: Han Liang , Lin Cai Lan
Published: July 2011

With the main problems which exist on the key customer management and the characteristics of high costs and high returns on the domestic coach industry, then it is necessary to further grade the key customers who are confirmed based on the ABC classification through the profit and loss accounting method. To identify the real key customers, which is in order to realize the benefit development of the customers and optimize configuration of the enterprise resources, and finally the enterprise realizes the benefit development. The analysis results of this paper show that: it is necessary for the coach enterprises to grade the key customers, so that it can better control the enterprise cost and realize the goal of enterprise profit by identifying and managing the real key customers from the perspective of cost control.
Challenges and Opportunities of Logistics Cost Reduction in China under the Background of Low-Carbon Economy
Authors: Han Liang , Li Xin Xin
Published: July 2011

The low-carbon economy already became the tendency of global development, and logistics holds the important position in the low-carbon economy. The low-carbon concept is also inevitably transmited to the logistics industry. For this reason, the notion of low-carbon logistics is proposed. Through the analysis of the challenges and opportunities logistics industry faces in China under the background of low-carbon economy , then this article discussed that what measures and methods logistic industry should take to reduce logistics cost and to improve the international competitive advantage.
A New Type of Packing Apparatus with High Efficiency and the Experimental Research of its Mass-Transfer Performance
Authors: Zhou San Ping , Lu Xi Man
Published: July 2011

In this paper, a new type of packing apparatus with high efficiency and uniform flow was developed to deal with wall effect and scaling effect of packed column. A desorption experiment was made in a circular cold-model experiment packed column by using air-water-CO2 as working substance, determining the height of mass transfer unit of liquid phase of the cold-model experiment packed column under different gas-liquid loads, with and without the packing apparatus. The experimental results show that under different spray densities, the height of mass transfer unit of liquid phase of the packed column added with the packing apparatus decreased approximately above 19% more than that not added the packing apparatus; the height of mass transfer unit of liquid phase lowers more with the decrease of the spray density, which demonstrated that the mass transfer efficiency of the packed column added with the packing apparatus was much higher than that of the column not added the packing apparatus.
Study on MgO-MgO•Al2O3 Bricks Used Burned Zone of Cement Rotary Kiln
Authors: Li Guo Hua , Chen Shu Jiang , Tian Lin
Published: July 2011

The effects of iron scales and high iron magnesite as well as the content on microstructure and properties of MgO-MgO·Al2O3 bricks used burned zone of large cement rotary kilns have been studied. It focuses on testing coating adherence in this paper. The results show that apparent porosity of adding iron scales sample is higher than the sample by adding high iron magnesite, which is increased with increasing of iron scales content; Compression strength is decreased with increasing of iron scales content, The high iron magnesia cause the irregular change of the compression strength, compression strength was maximum when high iron magnesite content of additive was 6%; Coating adherence was optimum adding 3% high iron magnesite, adding 3% iron scales is followed, any other is bad. Over all, the sample adding 3% high iron magnesite is more suitable for large dry method cement kiln burned zone．
Application of High Pressure Jet Grouting Technology in the Seepage Control of Earth Dam Reinforcement
Authors: Zhang Cong Jiao , Zhang Shi Bao , Fan Feng Shan
Published: July 2011

Based on the construction practice of strengthening dam foundation and cross-strait dam end (0+149～0+330) high pressure jet grouting impervious wall of an earth dam, this paper expounds the construction equipment, technological process, construction parameters and construction method of high pressure jet grouting impervious wall construction. By analyzing the impervious wall’s depth, continuity, strength, permeable rate, the quality of the wall is eligible, and its indexes comfort the design requirements. The experiences are useful in similar earth dam reinforcement construction.
The Design of Monitoring System Static Model for Storage and Retrieval Vehicles in an Automated Warehouse
Authors: Li Li , Shi Zhi Sheng
Published: July 2011

The goal of this paper was the design of monitoring system static model for storage and retrieval vehicles in an Automated Warehouse. As usual, the development of a static model required five preliminary steps: analysis of needs, identification of key object, design of static model, define of the attributes for the object class and creation of class diagram. The paper was also presented form above contents. First, the composition and operation process of R/S vehicles monitoring system were analyzed to identify the main entity object (Rack, InOutStation, Crane and association object (ConveyTask). Second, the core model of monitoring system was built up by analyzing the inter-relationships of the main objects. Three, by expanding the core model based on the needs of monitoring system, the static model was gained. Finally, the attributes for the object class were defined and the class diagram was created.
Reforming Teaching and Management System and Improving Engineering and Technical Personnel Practice and Innovation Ability
Authors: Gong Xue Min , Zhang Jia Yong , Guo Li Wen
Published: July 2011

With the development of technology and the society, the demand standard of enterprise to talented person is more and more strict. Through analyzing the special function of some methods, such as to carry out tutorial system, to reform teaching methods, to strengthen teaching management, to improve engineering test methods and improve school infrastructure measures, this paper discusses the new method to cultivate high quality engineering and technical personnel to provid theoretical guidance for future universities to meet market demand and cultivate innovative talents.