bluuebunny/crossref_metadata_2025 huggingface dataset:
Research of Dynamic Performance of Gear Shifting Process of Hydro-Mechanical Transmission Vehicle
Authors: Zhang Li Juan , Geng Ling Xin , Liu Zhao
Published: February 2011

The structure and working principle of main parts of the HMT are described and analyzed, and the mathematical models of HMT are built up. The results of computer simulation are carried out which manifest the mathematical models of HMT built in the thesis are feasible and the performance is suitable for multi-function vehicles
The Study of the Shaft Misalignment Compensation Ability of Four Holes Articulated Laminated Coupling
Authors: Shentu Liu Fang , Li Gui San
Published: February 2011

The function of the coupling in the connection device is to connect the two axises and transfer the movement. Due to the particular structure of the laminated coupling, the main function of the coupling is to compensate the misalignment generated in the operation process of the axises. In this paper, a new type of laminated structure coupling - four-hole Joint Bearing laminated coupling is proposed. By using this coupling the shaft misalignment compensation ability between the two axises is improved from 1.0 ° ~ 1.5 ° to 4 ° ~ 6 °. Classical mechanics method and ANSYS finite element analysis are employed to analyse 3 different sizes of joint couplings, respectively. From the analysis the position of the maximum stress and the shaft misalignment compensation ability of each kind of coupling which provide the theory basis for the design of the new type of the coupling can be obtained.
Study on Microscopic Mechanism for Sand Particles Lift-Off
Authors: Jin A Fang , Yang Zhi Chun , Gheni Mamtimin
Published: February 2011

Smoothed particle hydrodynamics (SPH) method is used to simulate the lift-off phenomenon of sand particles in the air flow. Whether the sand particles make any form of movement in the air flow, firstly, they always jump into the air from a standstill condition, so it is helpfull to understand the saltation mechanism of sand particles. Because the computitional region is discreted into particles in the SPH method, the movement of each particle can represent the machnical behavior of sand particles if the particle dispersion has the same characteristic with the sand particles. The foundmental theory of SPH method and its key elements are reviewed in detail, such as the kernel function, the choice of smoothing length and their influence on the numerical simulation results.In this study a numerical simulation model of wind-blown sand two-phase flow using SPH model is proposed and then the model is discreted to simulate the take-off process of sand particles with adquate boundary conditions. Simulation results show that the proposed model can be used to simulate the dynamic characteristics of sand particles in lift-off.
An Analysis on Virtual Material Making and its Application in 3D Animation Designs
Authors: Fang Jie
Published: February 2011

Three-dimensional animation is one of the greatest contributions made by computer sciences to the animation industry. The 3D animation has been widely used in movie special effects, commercials, computer games and computer-based education (CBE), and has become a well-known form of art in the world's pop culture. The rapid development of 3D animation also brings about fundamental changes in the materials used in animation production. This paper gives an introduction of the virtual materials in 3D animation, as well as the tools needed and methods of making the materials using 3D animation design software, especially Maya.
Numerical Modeling and Algorithm for Analysis of Powder Rolling
Authors: Qiu Cheng , Zheng Zhen Xing , Xia Wei , Zhou Zhao Yao
Published: February 2011

There are multiple nonlinearities during the course of powder rolling. Considering Material and Geometrical Nonlinearity during powder rolling, a constitutive model complying with an elliptical yield criterion aiming to the powder rolling is constructed based on the Updated Lagrange (U.L.) formulation by which the basic theory of numerical simulation is deduced. The numerical algorithm is discussed and it is implemented into user-subroutines of Marc. With the code, numerical simulation of powder rolling is performed. It is shown that the result of simulation was consistent with that of experiment and the whole result is dependable. The constitutive model and code developed in this work are correct and have good convergence during calculation. Its robustness is to be validated in simulations with complicated geometrical shape and boundary conditions.
Explosion-Proof Design for Coal Mine Rescue Robots
Authors: Li Yun Wang , Ge Shi Rong , Zhu Hua
Published: February 2011

The explosion-proof design for coal mine robots that are used to explore environment and rescue after coal mine disaster must be adopted. In order to carry out the explosion-proof design for coal mine robots reasonably, based on the analysis of coal mine robots and their explosion-proof design, the explosion-proof types for robots are studied on. The conclusions are as follows: (1) the mixed explosion-proof design including integrated and partial explosion-proof design can be adopted in the robots design; (2) protection types for robots mainly include flameproof enclosure, pressurized enclosure, intrinsic safety, and combination of them. Based on this, the explosion-proof structures of the mobile systems of a track-type robot and a rocker-type robot for coal mine environment exploration are introduced. According to the different structure of the two robots, the concentrated and dispersed flameproof enclosures are respectively designed for the track-type robot and a rocker-type robot. This paper can provide reference for the explosion-proof design for coal mine robots.
Achieving and Machinability Analysis of the Cutting Method for a Internal Surface
Authors: Fang Tian , Yu Deng Yang , Tao Zhi Yi
Published: February 2011

In order to solve the problems of aluminum package cleaning a kind of method of milling process for internal surface is proposed. Using three standard cutters which move as planets complete the milling processing for inner cylinder and bottom surface. This method makes the cutters forced reasonably and cutting efficiency is promoted. The adjusting device which is arranged on bigger mills makes the processing size to be changed so the applicability of this cutting method is improved greatly. After research the calculating method of cutting amounts and cutting force are established. The cutting capability of the new method is also analyzed in the paper. By the way the relation curve of cutting amounts and cutting force with cutter rotation rate are given. The achievements above will provide a theoretical basis for the application of this method.显示对应的拉丁字符的拼音
Simulation Analysis and Experiment Research for a Large Span and Heavy Load Crossbeam
Authors: Guo Tie Neng , Xi Fang Jian , Liu Zhi Feng , Cheng Qiang , Cai Li Gang
Published: February 2011

Aiming at solving issues of load bearing deformation compensation and sympathetic vibration, this paper takes a large span and heavy load crossbeam of a domestic heavy-type numerical control milling planer for research object, the final purpose is to improve machining precision and stability of the heavy machine tool product. The load curve considering the influence of columns deformation, natural frequency and vibration model are obtained, respectively by the dynamic and static simulation analysis of the crossbeam with the finite element analysis method. Then, the modal analysis results are verified through the model experiment. Lastly, this paper presents an approach by estimating the load curve to improve machining precision, points out the weak links, and provides guidance for crossbeam structure design, optimization and reverse manufacture.
A Heuristic Genetic Algorithm for Continuous Attribute Discretization in Rough Set Theory
Authors: Ren Zhao Hui , Hao Yuan , Wen Bang Chun
Published: February 2011

Continuous attribute discretization based on rough set is to got possibly minimum number of cuts, and at the same time it should not weaken the indiscernibility ability of the original decision system. In order to obtain the optimal cut set of the continuous attribute system, based on research the choice of candidate cut set, this paper presents a heuristic genetic algorithm for continuous attribute discretization to decision tables. In this algorithm making the importance of the continuous cut as heuristic message, a new operator is constructed to not only maintain the discernibility of the cuts selected, but also improve local search ability of the algorithm. Compared the performance of this method with the others’, this method is proved effective and superiority.
Anti-Alteration Technology for License Plate Recognition System
Authors: Yang Xing , Ling Yong Shun , Hao Xiao Li , Yang Hua , Ma Peng
Published: February 2011

In order to realize anti-alteration function for License Plate Recognition System (LPRS), a uniform-field imaging system is designed and a corresponding anti-alteration algorithm is proposed. First, reflection characteristics of license plate and typical alteration material are measured. As a result, the two characteristics in near-infrared range fluctuate moderately and the former is notably lower than the latter. Then the uniform-field imaging system for visible-light and near-infrared is designed to capture the difference above effectively. Finally, the anti-alteration algorithm, composed of license plate location, character matching segmentation and alteration recognition, is introduced. Experimental results have indicated that visible-light and near-infrared images can be acquired stably by the proposed system under the condition of natural illumination and there are discriminable gray differences between license plate and alteration material in near-infrared images; and that success rate and average executive time of the algorithm are 86.5% and 157ms respectively.
Reaction Synthesis of TiAl-Al2O3 Composites from Ti-Al-Cr2O3
Authors: Zhu Jian Feng , Yang Wen Wen , Du Fang Ni
Published: February 2011

Titanium aluminide composite reinforced with in situ formed submicron Al2O3 has been prepared by a reactive hot press method using Cr2O3, Al and Ti powder as starting materials. The reaction synthesis processing is particularly investigated. Results show that the matrix of the as-prepared material is a mixture of TiAl and a small amount of Ti3Al and Cr containing phase. Fine Al2O3 particles that act as reinforcing phase are dispersed along the interface of the matrix. The formation of TiAl/Al2O3 composite involves many transitional stages. Firstly, TiAl3 and Ti3Al intermediates were produced, then reducing reaction of Cr2O3 by Al formed Al2O3, and finally, the competitive solid-state diffusing reactions among Ti3Al, TiAl and TiAl3 produced the matrix phases of the TiAl/Al2O3 composite.
Synthesis and Luminescent Properties of Eu3+ Doped Double Molybdate Phosphors
Authors: Zhang Zhi Yong , Yang Yong , Li Wei
Published: February 2011

A series of trivalent europium (Eu3+) doped double molybdate phosphors (MLa(MoO4)2, M = Li, Na, K) have been prepared via traditional solid state reaction method at 500-800 °C. Their crystal structures and luminescent properties have been investigated, finding that the phosphors take on single phase through X-ray diffraction patterns (XRD) sintered at 600, 700 and 800 °C for lithium, soldium and potassium salt, respectively.Their excited spectra consist of a broad band and three absorptions, in which the higher peaks locate at 400 nm and 470 nm in the region of 350-500 nm. Excited with 470 nm, the emission spectra are composed of four narrow bands and the strongest emission peak is located at 615 nm. The appropriate doping concentration of Eu3+was 10 mol% for the 615 nm emission. The results indicate that this Eu3+activated NaLa(MoO4)2phosphors are promising yellowish red phosphor for ultraviolet (UV) and blue InGaN-based white LED.
Research on Mill Longitudinal Stiffness Calculation of Wide Hot Strip Mills
Authors: Wang Lian Sheng , Yang Quan , He An Rui , Liu Tian Wu , Guo De Fu , Liu Rui Jun
Published: February 2011

Mill is always weighed by its longitudinal stiffness. The prediction precision of longitudinal stiffness related strip geometric accuracy. Taking 1700mm hot strip line as research object, stiffness of housing, bearing wall and roll was calculated by finite elements method(FEM), hydraulic system stiffness was obtained by theoretical formula. Analyzing vertical system and structural symmetry of mill, functional relationship between longitudinal stiffness and its components stiffness was derived according to series or parallel connection with various components. Longitudinal stiffness was the basis on thickness set-up model. Calculation result was verified by practical test.
Rational Consideration on Package Design of Wooden Furniture
Authors: Zhang Hong Ying
Published: February 2011

With the increasing demand of woodiness furniture, wooden furniture packaging transportation becomes an important factor of keeping woodiness furniture quality stand. Generally, wooden furniture packaging including sealing, blowing, bagged, packing, pad, and labeling and so on. Reasonable woodiness furniture packaging design must consider these elements of packaging materials, packing size, tie-in of packages, convenient transportation and easily recycled.
Detection of MIMO Radar with Space-Time Coding in Compound Gaussian Environment
Authors: Ma Peng , Zhou Qing Song , Yang Xing
Published: February 2011

This paper mainly deals with the target detecting problem of MIMO radar with space time coding (STC) in compound Gaussian environment, which include the correlated Gaussian clutter and uncorrelated Gaussian scattering. The detector based on generalized likelihood ratio test (GLRT) criterion is studied, and two-step design procedure is adopted when the covariance of clutter is unknown. Specifically, a suitable GLRT estimate based on referenced data is inserted into the detector to make fully adaptive. Some numerical results are given, showing that the derived 2s-GLRT of STC MIMO radar can provide a good performance in spikier clutter and the adaptive loss is acceptable.
The Study on Oil Pipeline Leakage Control Device
Authors: Liu Wen Xue , Zhi Zhao Hua , Shan Gen Li
Published: February 2011

In terms of the characteristics of the oil pipeline leaks, A kind of leak control equipment was developed in which the remote control walking system, the facilities to find and locate pipe and the institutions of oil leakage recovery were designed, the explosion proof problem was solved also. The equipment can effectively raise the maintainability speed of oil pipeline leakiness, reduce an oil product pollution of leakiness to environment, lower the worker's risk and minimize the loss of the oil product leakiness.
Analysis on the Mechanical Properties and Electric Conductivity of SCFRW
Authors: Zhang Dong Yan , Sun Li Ping , Gui Hong Jie , Shi Guang Wei
Published: February 2011

Preparation and performance testing methods of short carbon fiber reinforced wood(SCFRW) were briefly introduced and utilized. Mechanical properties and electric conductivity of SCFRW veneering sample boards were analyzed with carbon fiber and woodiness fiber in different quality ratios, moreover, conductivity models were put forward according to the temperature influence on surface resistivity of composites. The experimental results showed that the performance of woodiness fiber boards were effectively improved by joining of carbon fiber, especially the modulus of elasticity. Meanwhile, it also endowed composites good electric conductivity, and nonlinear least squares fitting models was intuitively suitable for the negative effect relationship between surface resistivity and temperature, which provided basis and guidance for preparation and processes optimization of conductive woodiness functional composites.
Grammatical Evolution for Total Phosphorus in Reservoir Prediction
Authors: Kao Chin Ming , Chen Li , Wei Chih Chiang , Fu You Rong
Published: February 2011

The present study applied genetic programming (GP) to estimate the slump flow of high-performance concrete (HPC) using seven concrete ingredients. GP optimizes functions and their associated coefficients simultaneously and is suitable to automatically discover complex relationships between nonlinear systems. The results demonstrated that GP generates a more accurate formula and has lower estimating errors for predicting the slump flow of HPC than multiple linear regressions (MLRs).
Preliminary Screening of Microorganisms Producing Flocculent
Authors: Zhang Zheng Yuan , Xie Yu Hong , Wang Chen , Ma Yu Xi , Feng Xin , Ge Yan Hui
Published: February 2011

In order to reduce the production cost of Microbial Flocculation，this article uses the cheap straw-inorganic nitrogen medium，directly domesticated and screened out a stable and efficient microbial flocculant producing strain B-15，which has better flocculation on kaolin clay suspension system. Preliminary identify as bacillu, the strain produce flocculant has flocculating rate of 81.08% for suspension.
Influences of Diaphragm Springs on Operation Performances of Sight-Stabilizing Mechanism
Authors: Guo Gui Mei , Hong Lin
Published: February 2011

Sight-stabilizing mechanisms controlled by diaphragm springs and other damping elements is an important subordinate system of airborne sight stabilizing System. The performances of sight-stabilizing system depend on the characteristics of kinematics and dynamics of the system in a great extent. Among various external moments acting on the rod of the manipulator, such as those moments caused by damper, positioning spring, and restoration spring, the forces by diaphragm springs are most obvious. According to the structure form and motion peculiarity, the rod can be equivalent to a rigid body turning around a fix point. Simulation results reveal that the moment of the restoration spring to the rod is proportional to the angular displacement, and that the moment is the most prominent factor influencing the operating performances among all these moments. Through reasonable adjustments of structural parameters of the restoration spring, the performances of the sight-stabilizing system can be improved greatly; the analysis method provides a basis for guiding the design of concerned structural parameters of sight-stabilizing system.
Neural Network Based Sliding Mode Control for DC-DC Converters
Authors: Fan Li Ping , Yu Ya Zhou
Published: February 2011

DC-DC converters have some inherent characteristics such as high nonlinearity and time-variation, which often result in some difficulties in designing control schemes. RBF neural network sliding-mode control method is applied to PWM-based DC-DC converters in this paper. As the control input is duty cycle, the control inputs are in the scopes between 0 and 1. A general RBF neural network can not be suitable to control the PWM-based DC-DC converters, because the output layer of such network uses a linear function, and that the outputs of the network are between -∞ and +∞. Sigmoidal function is used instead of the output layer function in this paper to make the outputs are between 0 and 1. This sliding mode control method based on neural network can not only control the scope of the network output, but also eliminate the system chattering. Simulation experiments verify that this method can control the DC-DC converters well.
Dynamic Behavior of Bi-Axial Self-Synchronous Shaker with Translation Elliptic Trace
Authors: Zhu Wei Bing , Deng Cheng Zhong , Wang He Shun
Published: February 2011

According to the self-synchronous theory with two vibrating electric motors, a translation elliptic shaker is designed, and its finite element model for the sieving box is established. The dynamic behavior analysis of the sieving box is reached with CATIA software. The natural frequencies and modal oscillation modes of the sieving box are calculated, and the stress and deformation distribution in every part of the sieving box under rated load are obtained. All shows that, its structure design is reasonable. Under the designed working conditions, the maximum principal stress of the side boards is 39.7 MPa, and its dynamic strength is satisfied. The calculating results will be of significance to the design improvement, and give a basis for the experiment research of dynamic strength.
Vibration Analysis of Micro-Plate Using Modified Cosserat Theory and Differential Quadrature Method
Authors: Wang Xiao Ming , Wang Fei , Zhao Xue Zeng , Jing Da Lei
Published: February 2011

The scale effects on free vibration of micro-plate under the different boundary conditions are studied in this paper. The vibrating differential equation is presented based on modified Cosserat theory and Hamilton principle .The numerical solution is obtained using differential quadrature method. The results show that scale effects is highly significant on the natural frequency when characteristic length and thickness are close, and the natural frequencies increase along with the increase of characteristic length. Additionally, the thickness has significant influence on scale effects and the aspect ratio doesn’t affect.
Finite Element Analysis and Structural Optimization of the Box on the ANSYS Workbench
Authors: Cheng Kun
Published: February 2011

Aiming at the phenomenon that box parts had large deformation and highly centralized stress in working process, CAE technology based on platform ANSYS Workbench (AWE) had been used on the box for finite element analysing and structure optimizing.Based on illuminating the structure of AWE system, the total deformation, equivalent stress and safety factor of box under static water pressure were analysed and the stress distribution was gained. Based on this, the optimization methods of welding angle angle irons and changing the installation position of supports had been proposed, and the box after optimization had been analysed. The results show that the box had high safety factor,uniform stress, small deformation, superior performance after optimization and it also can fully meet the operating requirement.
Optimization Design and Buckling Analysis of ZLP500L Type Suspended Platform
Authors: Zhao Liang , Zhang Ke , Wu Yu Hou , Sun Jia , Yu Hui Ye
Published: February 2011

To take ZLP500L type suspended platform for research object, establishes parametric finite element model with ANSYS, and analyze static performance of its structure. Define the platform section parameters as the design variables, and structure in dangerous working conditions of stress and displacement as state variables, makes optimization design of platform with first-order method, so obtain lightweight high degree of section parameters which reducing 26.16% total quality of platform. Meanwhile makes buckling analysis of optimized platform to obtain smallest the critical load coefficient is 171.56, and then verifies the platform structure stability, provides theory basis to ZLP500L type suspended platform design and alteration.
Class Dependent Face Recognition with 3D Deformable Model
Authors: Bai Xiao Ming , Wang Cheng Zhang
Published: February 2011

Both class information of face subjects and color information of face images are very important cues for recognition. In this paper, a novel class dependent color face recognition approach based on block diagonal discriminant NMF is proposed. The approach employs block diagonal matrix to encode color information of face images simultaneously. Block diagonal constraint is imposed on discriminant NMF algorithm to construct feature extraction approach, which fuses class and color information at the same time into the extracted facial features. To improve learning efficiency of the algorithm, 3D active deformable model is exploited to generate virtual face images. Experimental results on CVL and CMU PIE face databases verify the effectiveness of the proposed approach.
A Method of Automatic Detection and Avoidance of Local Interference in Five-Axis Machining with Flat-End Cutter
Authors: Yan Xian Guo , Yan Xian Guo
Published: February 2011

This paper presents a new method of automatic detection and elimination of local interference methodology for five-axis complex surface machining with a flat-end milling cutter based on the technique of curvature matching and square grid points. A diameter of milling cutter was chosen by curvature matching to ensure interference-free at the point where the cutter and part contact. In odder to detect if rear interference occurs at the adjacent domain of contact point, the square grid points were employed to quickly build checking area and checking points. A technology of automatically generating square grid points and the method of detection and avoidance of local interference were also presented in this paper. Finally, the proposed methodology and algorithms were tested and verified by an example of NURBS surface.
Charred and Composted Agriculture-Forestry Organic Wastes as Components of Growing Media for the Production of Anthurium (Anthurium andraeanum Cv. ‘Pink Lady’)
Authors: Suo Lin Na , Sun Xiang Yang , Li Su Yan
Published: February 2011

The primary component of soilless rooting media for ornamental plant production is peat. However, quality peat is costly and is a nonrenewable natural resource. The current study compared the suitability of using charred and composted agriculture–forestry organic wastes (AFOW) vs. sphagnum peat as components of the growth medium for the ornamental plant Anthurium (Anthurium andraeanumcv. ‘Pink Lady’). Ten media were prepared from composted corn cobs (C), charred corn cobs (CH), charred garden wastes (CHG), and Pindstrup sphagnum peat moss (P). These media contained (% v/v): CH (100%), C (100%), CHG (100%), C (70%) + CHG (30%), CH (70%) + CHG(30%), C (35%) + CHG (15%) + P (50%), CH (50%) + P (50%), CH (35%) + CHG (15%) + P (50%), C (50%) + P (50%), and P (100%) as the control. After 8 months in the greenhouse, the growth and flowering of transplanted Anthurium were best with P, CH+P, CH+CHG+P. The results indicate that mixing charred AFOW with peat would provide a suitable medium for Anthurium production while reducing the need for peat and converting waste materials into useful products.
Finite Element Realization of Shape Memory Alloy Material Constitutive Model
Authors: Wang Yong Jun , Wang Zhen Qing , Yang Zeng Jie , Lv Hong Qing , Zhu Li Nan
Published: February 2011

Shape memory alloy (SMA) is a new intelligent material and is used widely in various structures. But the constitutive model of SMA is so complex and particular that it is difficult to calculate by finite element software. In this paper, a special constitutive model of SMA is chose and the constitutive variables are discretized. Through the derivation, it is made possible that the constitutive relation of SMA is put into the UMAT (user-defined material mechanical behavior) subroutine in ABAQUS. So it is available to calculate the structure contained SMA by finite element method.
Simulation Research for Self-Energizing Leveling Systems
Authors: Ning Xiao Bin , Zhao Cui Ling , Shen Ji Sheng
Published: February 2011

In order to decay vibration and recycle energy, the shock absorber that is self-energizing leveling systems was researched. The co-simulation method was adopted. A mathematical model for the shock absorber was built using the software MSC.EASY5, and the establishment of this model was based on the analysis of internal configuration and characteristics of valves. Debugging simulation of this model was also conducted. Vehicle simulation model was built using MSC.ADAMS. The assembly between vehicle simulation model and the shock absorber was realized through co-simulation between ADAMS/CAR and MSC.EASY5. After the integration of the full vehicle model the road test simulation with the input of random road surface signal was conducted. The simulation results shows that self-energizing leveling systems can partly recycle this energy which can be used to adjust ride height due to load change of automobile. This shock absorber is improving the ride performance of vehicle.
Swing-Up Control by BVP Arithmetic for the Rotational Inverted Pendulum
Authors: Yu Zhan Dong , Wang Xian Feng
Published: February 2011

The swing-up control strategy via BVP arithmetic is presented for rotational inverted pendulum. The swing-up control programming from hanging to the upright position can be transformed into the two-point boundary value problem (BVP) of nonlinear systems. According to the boundary conditions of the swing-up process, the control torque function of Fourier series form with free parameters is constructed. The BVP is solved with the bvp4c function in Matlab toolbox, and the control torque sequence is obtained. The swing-up process is open-loop feedforward control essentially. In order to inhibition parameters perturbation, the closed-loop stabilizing control is designed around the upright position for the inverted double pendulum with unstable zero-dynamics. The simulation of swing-up, stabilizing and switching process illustrates the effectivity of the control strategy.
Principle Analyzing and Structure Designing for Driving and Timing of Fluid Medium Pressure Difference Pipeline Robot
Authors: Zhang Yu Feng , Jiang Sheng Yuan , Zhang Xue Wen
Published: February 2011

A pipeline robot is brought forward using the energy of fluid medium transmitting within the pipeline to perform the driving and timing. The robot is soaking in the pipeline full of flowing fluid medium and getting the driving force from the press and velocity energy of medium itself to push forward it. It is discovered during the research that robot need to overcome the gravity and influence of the friction resistance with the pipe wall while driving alone, so for the different mediums and applying situation the robot required to velocity adjustment automatically. According to the condition of the hydrodynamics within the pipe and designing in reason for the size and configuration of the robot, a velocity controlling device is worked out and realized its velocity adjustable.
Elastoplastic Frictional Contact Study on Interference Fits of Compressor
Authors: Liao Ai Hua
Published: February 2011

The impeller mounted onto the compressor shaft assembly via interference fit is one of the key components of a centrifugal compressor stage. A suitable fit tolerance needs to be considered in the structural design. A locomotive-type turbocharger compressor with 24 blades under combined centrifugal and interference-fit loading was considered in the numerical analysis. The FE parametric quadratic programming (PQP) method which was developed based on the parametric variational principle (PVP) was used for the analysis of stress distribution of 3D elastoplastic frictional contact of impeller-shaft sleeve-shaft. The solution of elastoplastic frictional contact problems belongs to the unspecified boundary problems where the interaction between two kinds of nonlinearities should occur. The effect of fit tolerance, rotational speed and the contact stress distribution on the contact stress was discussed in detail in the numerical computation. The study play a referenced role in deciding the proper fit tolerance and improving design and manufacturing technology of compressor impellers.
Research on the Control System of Sorting Machine for IC Chips Based on AVR Microcontroller
Authors: Hu Jia Wen , Fan Xi Qiu
Published: February 2011

IC- (Integrated circuits) sorting machine is a kind of special equipment used for testing, classifying and grading IC chips, which is of significances in IC industry. Traditionally, IC- sorting machine is controlled by industry personal computer (IPC), which bears disadvantages such as large size and high cost. By contrast, the control system for IC-sorting machines presented in this paper is based on micro control unit (MCU), which is of relatively high reliability as well as high stability but low cost. First, we gave an outline of the configuration and operation principle of the sorting machine. Second, the input and output (I/O) signals that should be controlled were classified. Last but not least, the control strategy was presented both from the hardware side and the software side. In terms of the hardware design, touch screen was adopted as the human interface device (HID) for the sake of convenience, and isolated power module as well as optical isolated module were applied to improve the anti- electro magnetic interference (EMI) performance; In terms of software design, mechanisms such as multi-task by-turn and timer interrupt delay were adopted to improve the operation efficiency.
Study of Modification of R-PP Foamability by Blending with PDMS
Authors: Wang Ming Yi , Ji Lian Qing , Ma Jun , Zhou Nan Qiao , Park Chul B.
Published: February 2011

The effect of PDMS on foamability of R-PP was investigated using a single screw extrusion foaming system, with supercritical carbon dioxide as the blowing agent. Experimental results indicate that the addition of a small amount of PDMS will improve expansion ratio of R-PP foamed samples. Furthermore, compared with pure R-PP, cell-population density of foamed samples obtained from R-PP/PP-g-MAH/PDMS blends was obviously higher than that of pure R-PP foams.The experimental results show that blending with PDMS is beneficial for improving foaming performance of R-PP.
Cure Monitoring of Composites Based on Embedded Fiber Bragg Gratings
Authors: Shen Xiao Yan
Published: February 2011

Cure-induced strain is produced inevitably during the fabrication of the composite. To measure the strain, undamaged methods such as using fiber Bragg grating(FBG) sensor are employed. In this paper, nine unidirectional carbon fiber-reinforced polymer(CFRP) laminates are autoclaved produced, with FBGs embedded in different layers through the thickness (0-layer, 5-layer, 10-layer and 13-layer). The experiment measures the difference of the FBGs’ Bragg wavelengths before and after the cure which is linearly relevant to the cure-induced strain, to explore the distribution of strains through the thickness. The experimental results indicate a certain strain in neural plane of approximately 370με under the designed size of the laminates. The results also show that the cure-induced strains in different layers through the thickness are less than 1000με even including all errors, however they do not display distinct regular in thickness direction. Moreover, through the FBG sensors and the thermocouples, the cure process with the strain and temperature variations is understood well. The result verifies that the cure-induced strain is mainly generated at the end of the cure when the temperature cools down.
Fabircaiton and Characterization of a New Bi-Stable Electromagnetic Microrelay
Authors: Miao Xiao Dan , Dai Xu Han , Wang Pei Hong , Ding Gui Fu , Zhao Xiao Lin
Published: February 2011

This paper reports the fabrication and characterization of a new bi-stable electromagnetic microrelay based on surface micromachining technology. It mainly consists of an integrated coil, a SU-8 spacer, a nickel planar spring in combination with permanent magnet, and electrical contacts. With current, the spring is attracted or pulled up to close or open the external circuit. Without current, permanent magnet keeps the spring at bottom which reduced the power consumption. The bi-stability of electromagnet microrelay is realized by the balance between magnetic force and the elastic force of the spring. The detailed fabrication process is given. Testing results shows that this new bi-stable electromagnetic microrelay can work at 5V voltage pulse with large deflection at 350μm and switching time is fast at 4.96due to special design.
The Study of Characteristics of Sphere-Radial Phononic Crystals
Authors: Wen Qi Hua
Published: February 2011

By deducing the spherical elastic wave equation in theory, the concept of sphere-radial phononic crystal is proposed, and then the equations to determine the acoustic band structures is deduced. A numerical example is given for steel/nitrile rubber phononic crystal. The numerical simulation results suggest that the band gaps of sphere-radial phononic crystals do exist, which have better attenuation characteristics and practical application performance than the one-dimensional phononic crystals.
Research on Color Imaging in Wide-Field Optical Coherence Tomography
Authors: Feng Yin Qi , Jia Jia , Liu Yao Qin , Hao Jun Jun , Wang Kun
Published: February 2011

A color imaging method based on WFOCT technology is proposed, and a corresponding system is established. Using the system, monochromatic images and natural color images of samples are obtained experimentally. The mechanism of color imaging is investigated and discussed. It is shown that some distortion of color images may be caused by chromatic aberration and different wavelength responses of the system.
Application of Orthogonal Experimental Design on Reliability and Sensitivity Analysis
Authors: He Qin Shu , Liu Xi Nen , Xiao Shi Fu
Published: February 2011

In the present paper, the effects of four structural parameters at three levels on the reliability and sensitivity of structure are investigated. Sensitivity of parameters is achieved by the range analysis and the significance of parameters is achieved by the variance analysis. A response surface based on orthogonal experimental design and finite element calculations is elaborated so that the relation between the random input variables and structural responses could be established. The First-Order Reliability Method (FORM) as an approximated method is used here to assess the reliability. Comparing with the results of Monte Carlo simulations by ANSYS for a numerical example, the effect of sensitivity analysis has been proved, while the precision of the reliability and sensitivity should be improved in the future.
The Design of Capability Maturity Model of IT Project Management Based on ERP
Authors: Tan Ai Ping , Zhang Ying Hui , Liu Ming Li
Published: February 2011

With the rapid development of information technology, IT industries and IT products has become a new vitality industry type of economic field. The management capability maturity Model (CMM) is an important to evaluation the management ability of a enterprise, and at present has been widely used. Using the theory of fuzzy mathematics to design a management capability maturity model of IT project, and make the comparative analysis according to the ERP system development process of the different IT enterprise.
Microstructure and Wear Properties of GCr15 Alloy Produced by Equal Channel Angular Extrusion
Authors: Xiang Guo Quan , Zheng Min Xin , Ji Lian Qing
Published: February 2011

GCr15 alloy produced by hot-forged is subjected to equal channel angular extrusion (ECAE) process at 950°C. The microstructure of GCr15 steel via ECAE and annealed is studied by an optical microscope. The effect of ECAE and annealing on the wear properties of the alloy is also investigated. The results show that the grain size reduced from 50 mm to 10 mm via one pass ECAE, and the hardness of the alloy is increased. The wear mass loss of the alloy is greatly reduced due to the grain-refinement after ECAE and annealing.
Wedge Modulation Principle Analysis of Two-Dimensional Small Angles Measurement System
Authors: Wang Xuan Ze , Li Min , Zhai Zhong Sheng , Liu Wen Chao
Published: February 2011

In order to implement the measurement of two-dimensional small angles, a method of modulating optical-path differences through a wedge is put forward, based on Michelson interference principle. By promoting the wedge with a voice coil motor, optical path that pass through the wedge will be changed. Then the optical-path differences on fixed points of the receiving screen will be cycle changed. Then the interference fringes will be carried out on periodical motion. Utilizing voice coil motor and right angle flexible hinge moving cycle, the relationship between the driving voltage and the displacement of wedge also has been analyzed detailedly. The experiment results show that there is a good linearity while the driving voltage is in the range 3.2v-7.5v. Modulating optical-path in this linear range, precise measurement of two-dimensional angles can be realized.
Design of Chongqing Tourism Information System Based on WebGIS
Authors: Zhang Yu Rong
Published: February 2011

In modern society, informationization is becoming more for the lasting development of tourism. The design and application of Tourism Information System (TIS) is an important power to pull tourism development, then it’s very important to strengthen the constrution of TIS. WebGIS is an very important trend of Geographic information system (GIS). It not only has the general characteristics of GIS, but also has the special characteristics of Internet, thus it becomes the first platform for TIS. With the help of WebGIS, tourism enterprises can improve the management efficiency and service leve. In this paper, the research status of TIS at home and abroad has been discussed, the characteristics and functions of WebGIS has been analysed. Finally, according to the tourism characteristics of Chongqing city, the tourism information was divided into several typies, and then the design of space database，property database and Decision-making support systems has been analysed.
Analysis of Casting Quality of a Fastening Baffle with Failure
Authors: Zhu Mei Hua , Lu Jia Wei , Xi Ying , Zhang Jin Sen
Published: February 2011

A fastening of sleeper is an important part to bind rail, sleeper and foundation under the track, which requires enough strength, elasticity et al.. This article focuses on the common occurrence of fracture on a casting fastening baffle by metallographic analysis of the materials of different part in the casting, and reaches the conclusion that the unevenly distribution of chemical composition is due to the different cooling rate of different wall thickness. The low carbon content in thin wall and the lack of pearlite with high strength in matrix structure aggravates the danger of the emergence of cracks. Then a solution is put forward, which is to improve the structure of the casting and reasonably arrange the inner runner when casting.
Design and Implementation of the Supervisory Control Expert System for Dynamic Scheduling
Authors: Yin Jing , Chen Bao Jiang
Published: February 2011

In the paper, the problem of dynamic scheduling with random disturbance is taken into consideration. Through analyzing the workshop disturbance, the processing strategy and simulation procedure is proposed. On this basis, the supervisory control expert system is developed on the platform of G2. The simulation results given at last illustrate the main function of the system, including manufacturing process monitoring, abnormal event warning, and rescheduling.
Simulation and Analysis for Electromagnetic Shielding Performance of Magnesium
Authors: Li Yan Zhe , Fan Duo Wang , Chen Jia Ming
Published: February 2011

magnesium and magnesium alloys are green engineering materials for 21st century. In the paper, the model of electromagnetic shielding performance of Magnesium is built according to different media around magnesium. If magnesium is plated on engineering plastic board, the simulations show that the property of magnesium to reflect electric-field component is a little better than the property of magnesium to reflect magnetic-field component. Whether magnesium is surrounded with air medium, or magnesium is plated in engineering plastics board, the total shielding effectiveness of magnesium varies with thickness of magnesium and frequency of electromagnetic wave.
A Finite Element Analysis of the Residual Stress Distribution in the Interphase of Restoration-Tooth Structure
Authors: Zhu Shui Wen , Chen Guo Ping
Published: February 2011

The finite element analysis is presented in this paper in order to investigate residual stress distribution in the interphase of restoration-tooth structure due to polymerization shrinkage of resin-based composite. The restoration-tooth interface is simulated using plane elements of varying material properties and thicknesses. The stress within restored-tooth structure built-up from the polymerization shrinkage of the restorative composite were computed accounting for the time-dependent, visco-elastic behaviour of the composite. A sensitivity study is performed to examine the relative influence of geometric and material parameters of interphase on the shrinkage stress development. It was found that a correlation exists between material and geometry properties at the restoration-tooth interface and higher shrinkage stresses on interphase due to polymerization shrinkage. The development trend of residual stress from polymerization shrinkage in the restored-tooth structure was discussed and forecasted. The varying material and geometry properties of restoration-tooth interface seem to have conclusive effect on the interfacial stress system, as well as on the longevity of the restoration. From the purely mechanical point of view, this can result in interfacial debonding.
Energy Project Portfolio Management System Construction
Authors: Wu Yun Na , Wang Jia Li , Li Jiang Shuai
Published: February 2011

As increasingly complex of the energy project management, traditional project management system is not very suitable for energy projects management. Combined with unique characteristics of energy projects, this paper studies the current state of the energy project development and takes advantage of project portfolio management, builds the energy project portfolio management system which includes energy project advices, selection, evaluation, assessment and implementation. The system solves the complex problems of energy project management, and then ensures that energy projects meet the strategic requirements of country and enterprises.
Efficient Processing XPath Queries by Compressed XML Query Tree Based on Structural Index
Authors: Zhang Hai Wei , Hu Xiang Yu , Zhang Ying , Wen Yan Long , Yuan Xiao Jie
Published: February 2011

As XPath is the core of most XML query languages, the efficiency of processing XPath expression has been a main part of the cost in XML queries. However, most existing XPath processing algorithms, which don't take index structure into account, spend lots of costs on spaces and time. This paper proposes an efficient XPath query processing mechanism based on structural index that makes full use of XML structural index to quickly retrieve XML data. Coming together with the mechanism, the Compressed XPath Query Tree based on structural index is proposed, which significantly reduces many join operations. Then query algorithms are used to deal with all the structural relationship using our mechanism. Finally, experiments will run the algorithm on real XML datasets and query workloads to report the performance of our mechanism and show the efficiency compared with other mechanisms.
Analysis of a Linear Ultrasonic Motor Using L-B Hybrid Transducer
Authors: Liu Jun Kao , Liu Ying Xiang , Chen Wei Shan , Shi Sheng Jun
Published: February 2011

In this study, a linear ultrasonic motor using longitudinal and bending hybrid transducer is proposed, which contains two exponential shape horns located on two ends, and the end tips of the horns are used as the driving feet. Two groups of bending PZT ceramics are set in the middle of the transducer, and two groups of longitudinal PZT are set between the bending PZT and two horns, respectively. In this new design, longitudinal and bending vibrations of the transducer are composing and formed elliptical trajectory vibrations on the two end tips of the horns. The runners are in contact with the end tips of the horns, and the driving forces are the frictional forces between the runners and the driving tips. By using FEM method, the longitudinal and bending vibration modes are gained, and the corresponding resonant frequencies are tuned to realize the modal degeneration. At last, transient analysis is developed to gain the vibration trajectories of the driving tips, and elliptical motion trajectories are observed to be formed, which verify the feasibility of the proposed design.