bluuebunny/crossref_metadata_2025 huggingface dataset:
Research on S-Curve Speed Control for Step Motor Based on the MCU
Authors: Q Li Jun , Liang Bin
Published: March 2013

This paper researches the algorithm and equation of S curve, and realizes the process of discretization which converts curves to pulses. Finally, the experiment proved that the algorithm of S-curve of acceleration and deceleration control methods can improve the efficiency and stability of step motor.
Temperature Control System Design of Rapid Thermal Cycle Injection Moulds with Electric Heating
Authors: Huang Feng Li , Gu Jin Mei , Xu Jin Hong
Published: March 2013

Rapid thermal cycle injection molding technology with electric heating is a kind of widely-used and high-end injection molding technology; it can raise quality of plastic parts without reducing injection molding production efficiency. In the key technology of rapid thermal cycle injection molding with electric heating, the temperature control is the core technology. In this paper, we mainly design the temperature control system of small and medium size rapid thermal cycle injection molding with electric heating. First, give the temperature control parameters of mold, design the temperature control scheme , select type of PLC and design software of human-computer interface; second, the hardware, software, temperature control algorithm and human-computer interface of temperature control system are designed detailed; last, the temperature control system is simulated.
Anti-Collision Algorithm Analysis of ALOHA-Based RFID
Authors: Wang Yan Ping , Sheng Hui , Wang Xiao Ling , Zhang Xin Bo
Published: March 2013

RFID multi-tag identification process of the conflict on the basis of summing up the ALOHA class algorithm put forward an improved dynamic framed slotted ALOHA algorithm. Firstly, this paper uses the improved tag estimation algorithm to estimate the number of tags. Secondly, tag number is determined according to the length of the frame. Finally, tags are divided into several groups when the number of tags greater than the maximum frame length. The simulation results show that the efficiency of the algorithm has been improved obviously.
Fast 3D Human Face Modeling Method Based on Multiple View 2D Images
Authors: Wang Yong Sheng
Published: March 2013

This paper presents a novel approach to model 3D human face from multiple view 2D images in a fast mode. Our proposed method mainly includes three steps: 1) Face Recognition from 2D images, 2) Converting 2D images to 3D images, 3) Modeling 3D human face. To extract visual features of both 2D and 3D images, visual features adopted in 3D are described by Point Signature, and visual features utilized in 2D is represented by Gabor filter responses. Afterwards, 3D model is obtained by combining multiple view 2D images through calculating projections vector and translation vector. Experimental results show that our method can model 3D human face with high accuracy and efficiency.
Probabilistic Controlled Teleportation of an Arbitrary Triplet W State
Authors: Guo Zhan Ying , He Qing Lin , Shang Ming Zhe
Published: March 2013

A scheme is presented to probabilistically controlled teleport an arbitrary triplet W state using three pair maximally entangled triplet W state as the quantum channel. During the teleportation procedure, the controller performs Von Neumann measurements on his particles, the sender makes orthogonal basis measurements, instead of using Bell-state measurements, and the receiver can faithfully reconstruct the original state by performing relevant unitary transformations. The total probability of successful teleportation can be improved to 20/27. unitary transformation
Bell Waves and Kind Waves for a (1+1)-Dimensional Nonlinear Partial Differential Equation
Authors: Ren Qing Bao , Ma Song Hua , Fang Jian Ping
Published: March 2013

With the help of the symbolic computation system Maple and the mapping approach and a linear variable separation approach, a new family of exact solutions of the (1+1)-dimensional Burgers system is derived. Based on the derived solitary wave solution, some novel bell wave and kind wave excitations are investigated.
The Study on 4-Link Fish Robot Model Optimization Based on Evolutionary Algorithm
Authors: Sun Hui Ping
Published: March 2013

In this paper, we consider a model of 4-link fish robot whose motion is carangiform type. This fish robot is developed by Intelligent Control and Mechatronics Lab, University of Ulsan, Korea. With this type of robot, we research about the combination of HCA and GA to find the optimal parameters to build the input functions for this fish robot. Then, these optimal parameters will make fish robot swim at the fastest velocity with respect to its dynamic system.
Biomechanical Analysis of Cervical Finite Element Model
Authors: Wu Dong Mei , Zhang Li Tao , Zhao Jun
Published: March 2013

The finite element method is often used in the field of biomechanical analysis. It can study the mechanical response of the internal organization without any experiments on the human body. The paper studies the biomechanics of the cervical spine by the method of finite element analysis. Firstly, the finite element model of the cervical spine including cervical vertebrae and soft tissue is constructed. Secondly, biomechanical analysis of cervical finite element model which is validated to be reasonable and reliable is completed. The results of the control group, the anterior cervical decompression and fusion surgery group, and the artificial cervical disc replacement surgery group are obtained to study the motion degree and ligament force of cervical spine. Thirdly, the summary of the biomechanical analysis of cervical finite element model is concluded.
CPSO-SVM Based Petroleum Demand Prediction
Authors: Tang Li Fang
Published: March 2013

Study of oil demand, oil demand uncertainty, leading to its strong non-linear, sudden change characteristic, causes the linear modeling of traditional method and neural network prediction precision is low. In order to accurately forecast demand, presents a chaos particle swarm optimization of support vector machine oil demand forecasting method (CPSO-SVM). The CPSO SVM parameter optimization, and then using SVM to petroleum demand nonlinear variation modeling, finally to 1989~ 2007 oil demand data for simulation, the results show that, compared with other oil demand forecast algorithm, CPSO-SVM raised oil demand forecast accuracy, as demand for oil to provide a new method for predicting.
Force Loading Research on the Transfixion of High-Speed Train
Authors: Wang Ying Bo , Li Ming , Huang Qi Tao , Xu Hong Guang , Han Jun Wei
Published: March 2013

To test the feasibility of proposed double-loop force loading control structure for the integrated testing system for high-speed train end relationship, it established the co-dynamics model of Stewart parallel manipulator and transfixion and developed the PID force controller. The sine force tracking simulation test was carried out in Simulink environment. The results show that, whether the input is in single dof or in 6 dofs, the output can meet the demand of amplitude attenuation and phase lag . This proved that this system has a good performance in force loading and the proposed control structure is feasible for the force loading test of transfixion.
The Research of Layer System Subdivision and Adjustment Methods in YSL Block of the Low Permeability Reservoirs
Authors: Li Rong Hua , Zhang Jun Ting , Zhang Cheng Lin , Zhang Huan Huan , Qu Peng
Published: March 2013

Layer system subdivision and adjustment is applied in oilfield development to ease the contradiction in inner-layer and interlayer and implement separated layer water flooding well, which is a major adjustment measure to improve developing effects. YSL is a typical low-permeability oil field, whose petrophysics is poor, and which exist many problems, such as apparent contradictions between layers, and poor development effects through separated zone water injection and so on. In this article, the thickness of barriers, injection profile, permeability contrast and remaining oil distribution are analyzed comprehensively. So a reasonable method is also proposed. Much weakness that factors are not comprehensive in adjustment method and that the problems in the development process are not accurately reflected is overcome, which exists in the past methods. The adjustment means can utilize poor thin layers better, reduce invalid water injection and ease the contradictions between layer, and oilfield development effects are improved eventually. It is a reference and guidance for other blocks or oilfield which exist the same problems.
Large Margin Feature Selection for Support Vector Machine
Authors: Pan Wei , Ma Pei Jun , Su Xiao Hong
Published: March 2013

Feature selection is an preprocessing step in pattern analysis and machine learning. In this paper, we design a algorithm for feature subset. We present L1-norm regularization technique for sparse feature weight. Margin loss are introduced to evaluate features, and we employs gradient descent to search the optimal solution to maximize margin. The proposed technique is tested on UCI data sets. Compared with four margin based loss functions for SVM, the proposed technique is effective and efficient.
Study on Mechanism of Active Front Steering Based on Harmonic Drive
Authors: Gu Peng , Shi Guo Biao , Lin Yi
Published: March 2013

The steering ratio of vehicle can be changed by attaching a angle, Changing the steering gear ratio can improve the safety in high-speed and comfort in low-speed and the vehicle steering stability. The paper introduces an active front steering system (AFS) based on harmonic drive, the composition and working principle of the system are analyzed, and the kinematic analysis of the system is researched, finally, the self-control mechanism and integrated control mechanism with other stability system are studied.
Application and Research of Chinese Cultural Elements on Concept Car Design
Authors: Song Duan Shu
Published: March 2013

The aim of this research is to investigate the status of concept car design in china and abroad, and analysis the application of Chinese culture elements in concept car design. Based on the ergonomics principles, we refined Chinese culture elements and design a concept car which is environmental, fashionable and efficient. And we try to provide some suggestions to the Chinese elements concept car design in the future.
Reducer Vibration De-Noising Signal Research Based on Wavelet Transform
Authors: Yu Guang Bin , Huang Long , Dai Bing , Wu Xue Mei , Ma Wen Sheng
Published: March 2013

Wavelet de-nosing method for complex signal is put forward in this paper. The time resolution and frequency resolution are changed as wavelet transform for signal analysis. It uses high-frequency resolution and low time resolution in low frequency analysis, and uses low-frequency resolution and high time resolution in high frequency analysis. So it fit the uncertainty principle and realize the signal time domain and in frequency domain at the same time.
The Finite Element Analysis of Longmen Type Frame on Large Thickness Flame Cutting Machine
Authors: Chen Yong Qiu , Ma Yu Lai , Han Yong Kui
Published: March 2013

In this paper, finite element analysis was used to study the whole stiffness on the Longmen type frame by Pro/MECHANICA, the model simplification and mesh principle were elaborated, as well as the advantage of Pro/MECHANICA with adaptive P-method technology and with the traditional finite element software with non-adaptive H-method technology. The weakest link of the whole stiffness on the Longmen type frame was found out. The three main factors of affecting the whole stiffness was put forward to.
The Application of Flywheel Energy Storage Device in Marine Gas Turbine Generator Set
Authors: Li Shu Ying , Li Tie Lei , Wang Zhi Tao
Published: March 2013

Marine gas turbine generator set; Flywheel energy; Stability Abstract. Based on modular modeling idea, the modular model of marine generation system was set by the technology of systematic simulation. One set of simulation models of marine gas turbine generation system was generated. Results show that flywheel energy storage device can enhance the stability of power grid and play a better role in making marine gas turbine generation system stable under heavy load fluctuations.
Innovative Design of the Wind-Driven Efficient Feeding Mechanism
Authors: Wang Bao Gang , Song Qi Hui , Xu Guang Chi
Published: March 2013

A wind-driven feeding mechanism of high efficiency is designed according to the TRIZ theory and its mechanical structure innovative design based on the principle of energy conversion. It aims at delivering of small granular, cylindrical, flakes and other materials in machinery, pharmaceuticals, electronics and other industries by transmission mechanism such as the typical gear mechanism and linkage mechanism. The prototype is produced combined with the specific parameters of the common materials. The modular innovative design is adopted, including the transmission module, driver module and material feeding module. By the inspection of the actual operation, each design module of the produced prototype is stable and reliable. At the same time the effect of material transportation is good.
Three-Dimensional Finite Element Analysis on Heavy Cutting for High Strength Steel
Authors: Zhai Yuan Sheng , Liu Xian Li , Wang Yu
Published: March 2013

The finite element modeling and experimental validation of three-dimensional heavy cutting of high strength steel (2.25Cr-1Mo-0.25V) are presented. The commercial software Deform 3D applied for the finite element modeling is studied the effect of feed rate on the principal cutting forces and the temperature fields. The friction between the tool and the chip is assumed to follow a shear model and the local adaptive remeshing technique is used for the formation of chip. The feed rate significantly affects the cutting forces, but slightly influences the maximum temperature of the chip. The simulation results are compared with experimental data and found to be in good agreement.
The Finite Deformation Analysis of a Circular Membrane with an Embedded Rigid Inclusion under Uniform Pressure
Authors: Zhang Zhong Kai , Liu Bo , Sang Jian Bing , Qie Yan Hui
Published: March 2013

A new constitutive model which is modified from Gao’s constitutive model has been introduced to analyze the finite deformation of a circular membrane with an embedded rigid inclusion under uniform pressure. Based on the basic controlling equations, the constitutive parameters and the dimension of the rigid inclusion have been discussed to demonstrate the influences on the membrane stresses.
Research on Theory and Experiment of Milk Ingredients Analysis with Laser
Authors: Ding Guo Chao , Zhou Zhen , Liu Yan Long , Liu Ying Nan , Yin Jin Ying
Published: March 2013

In this paper, the laser is used as light source and interacted with the solution of milk powder; scattered light-to-transmitted light ratio is used to characterize the milk macromolecules. At first, this paper analyzes the theory of scattered light-to-transmitted light ratio，and a relation model is preliminarily built between the macromolecules and the ratio, then the parameters of the model are fitted through self-made experimental device. The relation model between the fat and protein of milk and the ratio is established.
The Analysis on Humanity Design in the Shape Studio of Maize Harvesters
Authors: Yuan Guo Yan
Published: March 2013

This article takes the existing maize harvesters in the market as the example to discuss about the problems on its design, color and function. By means of the Humanity Design which is more according with people’s psychological needs on the design, color and function of the maize harvesters, it could apply to the Agricultural Machinery all the more.
A Research on Fuzzy Clustering Analysis Model of Gas Well Pipe of High Pressure and High Temperature and High H2S
Authors: Wu Rui , Chen Pei Fu , Zhao Xin Tong
Published: March 2013

The mapping between influence factors of gas well pipe of high pressure & high temperature & high H2S and parameter collection is established in this paper. The index set is then formed by the collection and is transformed into fuzz collection later. And fuzz cluster model of gas well pipe is discussed based on that. The fuzz cluster model is the foundation to predict residual life of gas well pipe. The model is valuable both in theory and practice.
Modal Analysis on Rotor of Asynchronous Traction Motor Used in High-Speed Trains
Authors: Chen Si , Wang Fang , Cao Jun Ci
Published: March 2013

According to the suffered various impacts and vibrations of traction driving part in high-speed train under complex operating environments and conditions, the modal problems in the rotor of traction motor, power output device in traction transmission system, working in high-speed trains is investigated. In this paper, a Finite Element Analysis model for rotor modal simulation research is established, by using which the influences of structure parts on motor natural frequency is analyzed. From the simulation analysis, the natural frequencies, the vibration mode and the amplitude of each order modes are obtained, which could provide a theoretical basis for the rapid, stable and safety operation of high-speed trains.
Structural and Magnetic Behavior of Cobalt Doped Ba0.5Sr0.5Fe12O19 Nanoparticles Synthesized by Chemical Co-Precipitation Technique
Authors: Zhang Jun Li , Wu Ze , Dong Li Min , Jiang Tao , Zhang Xian You
Published: March 2013

Nanocrystalline M-type Co2+ substituted barium hexaferrites samples having generic formula barium Ba0.5Sr0.5Fe12-xCoxO19 (x=0.0, 0.2, 0.4, 0.6, 0.8 and 1.0) were synthesized by chemical co-precipitation method. The sintered samples were characterized by XRD, SEM and VSM techniques. All the XRD patterns showed the single phase of the magnetoplumbite barium ferrite without other intermediate phase. The lattice parameters (a and c) obtained from XRD data decreases with increase in cobalt content x. The magnetic behavior of the samples was studied using vibrating sample magnetometer technique. The saturation magnetization (Ms) first increases reaching a maximum of 63.684 emu/g at x=0.4, and then decreases. The coercivity (Hc) decreases with increase in cobalt content x.
Deformation Behavior and Processing Map of High Temperature of TC21 Titanium Alloy
Authors: Gong Ying
Published: March 2013

The compression test on TC21 titanium alloy was carried out in the temperature range of 860~940oC and the strain rate range of 0.01~10s-1 on Gleeble-1500D hot simulation machine. And the hot deformation behavior was studied. The processing map was calculated and analyzed according the dynamic materials model. It is found that the flow stress of TC21 decreases with the increasing of the temperature and the decreasing of the strain rate. The flow stress curves are characterized by steady state at low strain rate( s-1）but discontinuous yield at high strain rate( s-1). The processing map established at the true strain of 0.4 shows that there are three regions, instability and safe and peak region, and the efficiencies of power dissipation are 0~25%，31%~37% and 43%~49% respectively. The peak region is the optimum hot working zone of TC21 titanium alloy.
The Preparation and Characteristic of Superparamagnetic Core/Shell Nanoparticles
Authors: Shen Hong Xia , Yin Zheng Zhi , Cheng Qiong
Published: March 2013

Superparamagnetic core/shell nanoparticles have been prepared successfully by the reduction of Au3+ onto the surface of superparamagnetic nanoparticles. The core/shell nanoparticles were characterized by Transmission electron microscopy (TEM), X-ray powder diffraction patterns (XRD), UV–vis spectrophotometer, Vibration Sample Magnetometer(VSM) and micro-confocal Raman system. The results revealed that the prepared core/shell nanoparticles were covered by Au shell. These superparamagnetic nanoparticles can be highly sensitively detected and afford new opportunities for biomedical applications through chemical bonding of bioactive molecules with the Au shell of nanoparticles.
Model Design of Micron Wood Paring Bone Fracture Fixture
Authors: Guo Han , Ma Yan
Published: March 2013

This paper describes the whole modeling process of bone fracture fixture of micron wood paring, during which, positional parameters of the plates are calculated by formulas based on the three base planes of the fixtures plate, then after analyzing these positional parameters, the conclusion is tuning parameters of the plate should be determined according to human’s height. After that, Korean pines from Lesser Xing′an are chosen as the source for wood in the experiment, after cell lysis and long wood paring molding, the new fixture material of micron wood paring is created with much higher density than the original wood, very low expansivity after water absorption and almost no change after 24 hours’ immersion in water.
State Equation for an Advanced Ferromagnetic Base Composite Material
Authors: Gao Guang Fa , Yuan Shu Jie , Li Yong Chi , Shen Ling Yan
Published: March 2013

Ferromagnetic base composite material is widely used in aerospace field, and its high pressure mechanical properties become the study hot spot in recently years. Aimed at an advanced ferromagnetic base composite material, its impact compression behaviors were investigated by means of Light Gas Gun (LGG). The shock wave velocity (D) and the particle velocity (u) behind the shock wave were measured and calculated by using Asymmetry Impact and Direct Measurement. Based on the experimental results and calculated results, a D-u type Hugoniot curve was obtained. The Grüneisen equation of state for the ferromagnetic base composite material and its coefficients were obtained on the basis of its Hugoniot curve.
Study on Preparation and Luminescence of Green Phosphate Phosphor
Authors: Wu Ze , Jiang Tao , Liang Nai Xiang , Sun Ya Ling , Dong Li Min
Published: March 2013

In this article, La0.6Ce0.27Tb0.13PO4 green phosphor has been successfully synthesized through the method of co-percipition. The surface composition, morphology, and fluorescence properties of luminescent materials were characterized by XRD, SEM, and PL. The results showed that: the added sensitizer of Ce3+ ion rapidly increased the fluorescence intensity, further proved that Ce3+ ions have sensitization on Tb3+ ions. In system of La1-x-yPO4: yCe, the fluorescence intensity of xTb, La0.8PO4:0.1Ce,0.1Tb is strongest, and it’s the best ratio of the system.
Structural Additional Stories and Reconstruction Design for Sugar-Making Workshop of Hailun Sugar Plant
Authors: Chen Yuan Jing
Published: March 2013

The renovation and expansion project of sugar-making workshop of Hailun sugar plant made use of existing workshop to implement expansion and structural adding stores and reconstruction. In the reconstruction design of the upper section, firstly the assessment and appraisal for the seismic performance and structural system’s bearing capacity performance of the existing structure was done to establish the principles and methods of reconstruction and reinforcement. Then several measures were taken according to different parts and requirements and site conditions so that economic and rational effects were achieved.
Heat Transfer Performance of Glazed Units in Dual Airflow Windows
Authors: Sun Bo , Hong Guang Yu , Xu Ming Tao , Wang Wen Jian
Published: March 2013

The purpose of this paper is to derive a new method to research heat transfer performance of special glazed units in dual airflow windows because of their special structure and function. The equivalent height has been defined to conduct the analysis of this specificity. Two models names ISO and EN have been built and tested by experiment. The results calculated by the models are compared to ensure the conclusions are correct. Meanwhile two models lead to better understanding the rules of heat transfer in a triple glazed unit.
The Stock Price Forecasting Comparative Research of the Use of Fractal Theory at Taiwan Traditional Industry and Technology Industry
Authors: Ling Pang Wen
Published: March 2013

As natural phenomena, financial and securities markets are full of unpredictable changes. It is an interesting topic whether fluctuation of stock prices follows certain rules. This paper sources data from the stock market of Taiwan, and selects the stock of Uni-President Enterprises Corp. which is a representative stock with large capital share, and belongs to an traditional industry that is not affected by business cycles, and selects the stock of TSMC which is a representative stock with large capital share, and belongs to an technology industry that is easily affected by business cycles. This paper will use the Fractal theory to study the accuracy of prediction of the random stock price of these two industries.
Impact on Perceptual Speed to Geometry Pattern
Authors: Wu Nai Qun , Shi Yao Jun
Published: March 2013

After the research on the velocity perception, and the analysis and studies to the effect generated from various illusion forms of movement pattern speed, surveys of perceptual speed and physical speed differences, know the features of impacting the speed to perceive the special design. Form an interest that reflects a picture on the road of the geometry impact. Through the study, then prove the relationship and influence factors between the perceptual speed and geometry, which makes contribution to research development of road mode.
Influence Research of Recess Shape on Dynamic Effect of Hydrostatic Thrust Bearing
Authors: Yu Xiao Dong , Li Zhen Guo , Zhou De Fan , Li Heng Wei , Gao Chun Li , Qiu Zhi Xin , Wu Bo , Zhang Yan Qin , Qin Bai , Dong Xue Zhe
Published: March 2013

This work describes a simulation research concerning dynamic effect of multi-pad hydrostatic thrust bearing having rectangular recess, sector recess, ellipse recess and I-shaped recess in order to solve the loading capacity of the hydrostatic thrust bearing. Three-dimensional pressure field of gap fluid between the rotation worktable and the base has been computed by using the Finite Volume Method. This study theoretically analyzes the influence of recess shape on dynamic effect of the bearing according to computational fluid dynamics and lubricating theory, and the simulation results indicate that an improved characteristic will be affected by recess shape easily. Through this method, the safety of a multi-pad hydrostatic thrust bearing having different cavities can be forecasted, and the optimal loading capacity of such products can be achieved, so it can provide reasonable data for design, lubrication, experience and thermal deformation computation for hydrostatic thrust bearing.
Analysis of Electrical Capacitance Tomography Plotting Field Method
Authors: Yang Cong Jing , Chen De Yun , Zhang Li
Published: March 2013

Sensor sensitivity field in Electrical Capacitance Tomography is affected by the distribution of multiphase medium, which is the peculiarity of soft field, which brings great difficulty for image reconstruction, to improve the quality of image reconstruction, it is important to analyze the distribution of sensitivity field. In this paper, using finite element model, comparing the two different plotting patterns to field, then, expound a new kind of plotting pattern to field, and computer simulation to the distribution of sensitivity field. From experiments, simulation result will be fine if adopting unequal interval plotting patterns, at the same time, the result has high precision.
No-Contact Hydraulic Dynamic Seal Characteristic Study Base on CFD
Authors: Yu G.B. , Dai B. , Huang L. , Nie J.F. , Zhao Y.
Published: March 2013

Non-contact hydraulic seal (clearance seal) reduce the leakage by the small clearance between the seal. Non-contact hydraulic seal is the simplest form of a seal. The sealing effect depends on the size of the clearance and pressure difference, the length and parts of the sealing surface quality. Among them, the clearance size of the greatest impact on the sealing performance. The hydraulic systems sealing mathematical and CFD model are built in this paper. Studies have shown that eccentricity ratio, seal clearance and pressure are has impact to hydraulic force and leakage. It should be considered in the engineering design.
A Fuzzy Logic Controller Application for Marine Power Plant
Authors: Wang Zhi Tao , Ying Yu Long , Li Shu Ying , Li Tie Lei
Published: March 2013

In order to ensure the quality of marine gas turbine generation set, its speed must maintain constant. Due to rising or falling power demand, the real and reactive power balance is harmed and hence the turbine output speed gets deviated from nominal value. This necessitates the need for an intelligent fuzzy controller to generate and deliver power in an interconnected system as economically and reliably as possible while maintaining the power turbine speed within permissible limits. The design of complex parameter self-tuning fuzzy control system and efficient simulation were achieved. The models were simulated for different load conditions in order to demonstrate the effectiveness of the proposed controller. Simulation results emphasized the improved performance in comparison with fixed gain controllers. The proposed method overcomes the drawbacks of a conventional fixed gain controller and improvement was achieved in terms of settling time, oscillations and overshoot.
Research on Site Selection of Aviation Overhaul Depot Based on Particle Swarm Optimization
Authors: Liu Cheng Liang , Fan Hui Lin , Hou Man Yi , Bao Xue Liang
Published: March 2013

As support agencies of the aviation maintenance and support system, the aviation overhaul depots undertake an important and arduous support mission, which play a pivotal role, so the science and rationality of site selection is extremely significant. This paper choose the nonlinear programming method to build a mathematic model, so as to solve the problem. For the purpose of optimizing and solving the model, a thought based on the improved particle swarm optimization which used in the model is put forward to, and an improved PSO which gained by the analyzing the standard PSO and improving the initial PSO is presented in this paper. Finally, an application example is given to analyze and summarize the model.
LSA-Based Automated Essay Scoring in Chinese Context
Authors: Yao Xue Mei
Published: March 2013

Since its invention in the 1990s, an immense body of academic literature on LSA regarding to Automated Essay Scoring (AES) has been published. The current study investigated the extent of applicability and usefulness of LSA-based AES for assigning English essays written by Chinese college students. The statistical results showed the application of LSA-based AES in Chinese EFL context is to the limited context. The reason is that LSA-based AES focuses on content while Chinese English writing test are grammar-oriented.
Dynamics Analysis of 6-DOF Platform under the Condition of Unbalanced Force
Authors: Jie Liu , Yi Tang , Li Li Hua , Li Xian Fei , Liang Xiao Dong
Published: March 2013

During the use of 6－DOF(six degrees of freedom) platform the gravity center of force tends to deviate from the center of the upper platform, resulting in six rods are forced unbalanced. This paper firstly introduces the characteristics of the 6－DOF platform, then establishes simulation model of platform through the PRO/E software, and analyses the kinematics of platform by use of the ADAMS (Automatic Dynamics Analysis of Mechanical System) software, finally proceeds with dynamics analysis of six rods in unbalanced condition.Those will get the influence degree of rods under the unbalanced force,and provide some proposal for the rational use of the platform.
Feature Point Extraction Method of X-Ray Image Based on Scale Invariant
Authors: Wang Yan Wei , Zhang Si Qing , Lin Bing , Liang Hong , Pan Yan Ming
Published: March 2013

Feature Point Extraction Method of X-ray Image Based on Scale Invariant is proposed in this paper for industrial X-ray image with low contrast and some artifacts. First of all, the scale transformation of original image is adopted by the Gaussian kernel to building the DOG multi-scale pyramid. Then, the location and scale of the key points is fixed by the three-dimensional quadratic function. Finally, the Simply SIFT descriptor illustrates the key points. Experimental results show that the algorithm has good stability in translation, rotation and affine transformation, especially with 10 percent normalized Gaussian noise, this algorithm can still be detected feature points accuracy.
Effect of Different Winding Angle of Fiberglass on Parametric Stability of Structurally Anisotropic Cylindrical Axisymmetric Shells
Authors: Wang Yan Fu , Wang Zhi Wei
Published: March 2013

In this paper, the dynamical stability analysis of anisotropic cylindrical shells under uniformly distributed periodic extensional axial force is presented, while the winding angle varies. Fiberglass reinforced plastic is considered as a homogeneous solid anisotropic material. The shell’s elastic properties depend on the winding angle of fiberglass. The effect of the winding angle on the critical axial force is investigated. The intervals of winding angles at which the parametrically unstable vibration happen are determined
Stress Performance Theory and Experimental Comparison Analysis on Spatial Steel Pipe Truss Roof
Authors: Pei Huan
Published: March 2013

A newly built train station housing cover using a parasol unit structure,main structure component is bidirectional cantilever stell truss,chord rod is large size welding thin wall box section,canopy adopt large span steel truss.Because the span of the structure is large,the structure is strange,the process of the construction is complex, plus the period is long and difficult,so there are uncertain factors in the process. Therefore,the process of construction mechanical characteristics and design states may be different.It is necessary to conduct stress performance monitoring in the construction process.This paper introduces test condition of train station roof structure.At the same time,the installation process of the stell roof system is simulated and analyzed with MIDAS in this paper.By the analysis and comparison of the test value and the theoretical analysis of the scene,there are some rule of deform and stress in the process of construction and points out some problems needing attention in the construction period.
Research of Loop Pre-Stress Tension Test for Cable-Stayed Bridge Pylon Based on Full-Scale Sectional Model
Authors: Liu Qi Wei , Huang Shu Wen , Hong Yong , Luo Wen Lin
Published: March 2013

Based on full-scale sectional model experiment for cable pylon anchorage zone of cable-stayed bridge, this research tested the friction factor and deviation factor of the duct. The reason that tension elongation of loop prestressing tendon exceeded the provision of ±6% in specification was analyzed systematically. A correctional calculation formula was proposed, with quantitative analysis for influencing factors of tension elongation. The formula shows good applicability in practical engineering and has reference value for similar loop prestressing tendon.
Study on Shear Behaviour of Concrete Beams Prestressed with External CFRP Tendons
Authors: Wang Xin Ding , Dai Hang , Zhang Yong Chao
Published: March 2013

Based on independent research and development of a CFRP tendons wedge-type anchorage, the shear tests of six CFRP external prestressing concrete beams were done. Among them, CFRP external tendons of three pieces were installed in straight line while other pieces were installed in curved line. The results of experimental research show that shear behaviour of concrete beams prestressed with CFRP external tendons are the similar process to the traditional prestressed reinforced concrete beams. They go through the elastic stage, the stage of crack extension, the yield stage of internal hoop reinforcements at the intersection of inclined cracks and the failure stage. When external CFRP tendons are arranged in the same situation, the cracking load and the shear capacity of concrete beams prestressed with CFRP external tendons reduce gradually along with the increase of shear-span ratio,.When shear-span ratio is equal, the cracking load and the shear capacity of concrete beams prestressed with curved arrangement of CFRP external tendons are larger than those of concrete beams prestressed with straight arrangement of CFRP external tendons. Compared with traditional concrete beams prestressed with external steel bars, due to elasticity modulus and shear modulus of CFRP tendons are both smaller than those of steel bars, the mid-span deflection of concrete beams prestressed with CFRP external tendons at the time of shear failure is bigger than that of traditional concrete beams prestressed with external steel bars under the same circumstance.
Finite Element Analysis about Temporary Bracing of Prefabricated Column of Prefabricated Structure
Authors: Yin Wan Yun , Chen Dong , Yang Xiao , Ding Ke Wei , Jin Ren Cai , Liu Shou Chen
Published: March 2013

Based on the features of lifting construction of prefabricated structure, propose a new type of temporary bracing of prefabricated column, and analyze the two different structural forms of the traditional prefabricated column bracing frame and the new prefabricated column bracing frame by finite element software ANSYS. The results show that the new precast column support frame have a better stability and stronger lodging resistance
Three-Dimensional Analysis of Excavating Face Stability Supported by Pipe Roof
Authors: Yuan Xiang , Zhou Shun Hua , Gong Quan Mei
Published: March 2013

This paper analyzes the load transfer characteristics of pipe roof over the excavating face, and the analytical solution of tunnel face stability is established by the method of three-dimensional analysis. Through the calculation of the load transfer of the pipe roof, it indicates that the released load of excavation is passed to the supporting structure and soil which is not excavated by the effect of the pipe roof, and the magnitude of load and coverage of impact are in connection with excavating footage as well as subgrade reaction. The three-dimensional analytical solution of tunnel face stability is used to analyze a project case of Airport Road underpass in Hangzhou. The results show that the tunnel face stability is not guaranteed when excavated on a large section while the stability is enhanced when excavated on separated pilot headings.
Study on Dynamic Failure Behaviors of Steel Doble-Layer Grids (42X42m) Supported by Circumjacent Steel Columns Used in a Gymnasium under Disaster Earthquake Action
Authors: Niu Yun Jing , Li Hai Wang , Liu Jing
Published: March 2013

In this paper, the elasto-plastic dynamic analysis on dynamic failure behaviors of steel double-layer grids supported by tridimensional truss columns used in a gymnasium with the function of earthquake victims shelter under disaster earthquake is carried out under EL-centro wave with SAP2000, and the appraisal results on their anti-failure performances are presented under strong earthquake action based on the plastic-hinge theory. In the analyses, the geometric and material nonlinear effects are considered simultaneously based on the plastic-hinge theory. The plastic development level of the rod, the deformed shape and the failure type and the ductility are estimated by plastic hinge principle. The results show that the failure model of the structure under the earthquake wave action is the complicated combination of strength failure and elasto-plastic dynamic local buckling in deferent areas of the structure; When the structure reached its failure critical limit, the development of the plastic hinges is not sufficient and only 5.11% of the rods enter into their plastic stage; Its critical failure peak acceleration of EL earthquake wave when applied in the combination of three directions is 705gal and can be served as earthquake victims shelter in the area of 8 degree seismic fortification; Its displacement ductility coefficient is 2.39,which shows the structure owns good energy dissipation capacity.
In Situ Test of Cohesive Strength on the Interface Zone between Mortar and Aggregate in Concrete
Authors: Liu Xiao Ling , Lei Ting , Pei Chao Wu , Yao Yong
Published: March 2013

The interface zone in concrete is the weak link and its structures and properties are the key factors determining overall performance of concrete. In this paper, the cohesive strength on the interface zone is tested through the in- situ drawing test of the aggregate from the concretes of C15,C20, C25, C30,C35,C40. and the tensile strength and the shear strength on the interface zone are analyzed by the simple assumptions about the uniform drawing and well distributed stress on the interface. As a result, It’s showed that with the pebble size increased, normalized pull strength of low grade concrete has a tendency to increase, while high grade concrete is in the vicinity of 7% fluctuation; when pebble diameters are the same, with the concrete strength increases, the normalized pull-out strength decreases. As the particle size less than 30mm or more than 110mm, tensile strength seems to limit value. the macro pull strength is on the range of 4%—12% of concrete compressive strength.
Structure Health Monitoring System of a Noval Steel-Free Cable Stayed Bridge
Authors: Ma Ming Lei , Wang Gui Ling , Miao Dong Mei , Lian Bao Yu
Published: March 2013

Steel and concrete are the main buiding material of the civil engineering community, but with its easily errosion behaviour and CO2 discharge, it should be substituded with new materials.Fiber reiforcement polymer (FRP) is such a developped material, with its high strength to weight ratio, durability prolongation, hight stiffness to weight ratio and its fatigue resistance behaviour, it is now getting widely used in civil engineering. This article focused on how to design, built and operate a structure health monitoring system for the noval steel-free cable stayed bridge, and a knowledge discovery model, SG（Simplified-General）modle was provided for analyzing the collected data.
Theoretic Analysis for Composite Elastic Modulus of Concrete-Filled Rectangular Steel Tube Member
Authors: Chen Jun Ming , Chen Hui , Chen Ying Bo , Fan Jian Feng
Published: March 2013

Considering the hooping effect between steel tube and core concrete, established a small-deformation elastic analysis theory for the concrete-filled rectangle steel tube (CFRST) member, founded the elastic constitutive relations of CFRST, and accomplished the semi-analytical and semi-numerical solution of the composite elastic modulus. Research shows: composite elastic modulus of CFRST is higher than conversion elastic modulus without considering the hooping effect. Within certain value range of parameters, composite elastic modulus is 1.36% - 15.3% higher than conversion elastic modulus. Further more, as the steel ratio increases, the composite elastic modulus increases significantly, but the sensitivity of the composite elastic modulus to the strength of concrete is small.
Finite Element Analysis of Steel-Shotcrete Composite Using the Fiber Beam-Column Element
Authors: Kim Jeong Soo , Kim Moon Kyum
Published: March 2013

Owing to strong nonlinearity of shotcrete and difficulty of determining the equivalent material properties of steel-shotcrete composites for numerical analysis, methods are required to estimate nonlinear behavior of steel-shotcrete composite in the computational aspect efficiently. In this study, the behavior of steel-shotcrete composites, main primary supports in the NATM tunnel, are estimated by finite element method using the fiber beam-column element. The numerical results are compared with results of uniaxial and flexural test. Results of comparison show that finite element analysis of using fiber beam-column element can be an efficient tool of estimating the steel-shotcrete composite as the primary support in the NATM tunnel.
The Effects of the Rubber Bearing on the Seismic Performance of the Aqueduct-Water Coupling Structure
Authors: Duan Qiu Hua , Zeng Dan Dan , Yang Lu Feng
Published: March 2013

Rubber bearings are widely used in bridge structures. The aqueduct structures are water bridges, so rubber bearings are often set at the end of the aqueducts. Rubber bearing cannot solve the problems such as temperature stress and supporting inhomogeneous settlement, but also play role of isolation damping. This paper mainly studies on the effects of the water-depth with changing rubber bearing on the seismic performance of the aqueduct-water coupling structure by numerical analysis.
Turnover Experimental Research on Anti-Slipping Performance of Steel Pipe Joints with Swivel Coupler
Authors: Zheng Lian Qiong , Cai Xue Feng , Zhuang Jin Ping
Published: March 2013

A series Anti-slipping tests on steel pipe joints with swivel coupler were carried out in this paper. Sixteen specimens after turnover loaded, were tested to investigate the influence of variations in the Fastener tightening torque (Tr, from 20 to 40N•m), fastener turnover frequency (N, from 10 to 50) and turnover loading amplitude (△P, from 4.0 to 8.0kN) on the anti-slipping performance of steel pipe joints with swivel coupler. The experimental results showed that, the anti-slipping ultimate strength and stiffness of specimens were increased first and then decreased with increasing Tr or N, and decreased with increasing △P. The swivel coupler turnover should not exceed the number of 20, and the force of diagonal bracing bearing should less than 6 kN.
Stability Analysis of Side Slope under Normal and Rainfall Conditions
Authors: Zhang Cheng Liang , Liu Lei , Wang Chun
Published: March 2013

The paper studied a side slope engineering of highway in K29+450~K29+900 sections by making an on-site survey of landform and geological features of the side slope. By combining drilling, high-density electrical method and numerical simulation method, the depth and range of the sliding surface were determined. The stability of the side slope after an excavation in a normal and a rainfall conditions was analyzed using numerical simulation method, and simulation results show that in the normal condition the safety factor of the side slope is 1.12, and it is 1.05 in the rainfall condition; the distribution of plastic zones is wide, especially in the rainfall condition, the side slope has a large deformation and is in an unstable state. When a program of side slope reinforcement is chosen, the impact under rainfall condition should be considered in order to ensure long-term stability of side slope.
Prediction of Residual Displacement of SDOF System from its Peak Inelastic Displacement
Authors: Yu Bo , Liu Di , Yang Lu Feng
Published: March 2013

Residual displacement is an important measure of post-earthquake functionality of engineering structures. Empirical equations for prediction of residual displacement of SDOF system from its peak inelastic displacement were proposed through a comprehensive statistical analysis. An inelastic seismic analysis model including the P-Δ effect was employed to assess the residual and peak inelastic displacements of SDOF system under horizontal and vertical excitations. The correlation and empirical equations between residual and peak inelastic displacements were discussed based on 69 selected earthquake records. Results show that the correlation between residual and peak inelastic displacements are of high correlation, and the mean of residual-to-peak displacement ratio increases with the increase of period of vibration or stability factor. Furthermore, the coefficient of variation of residual-to-peak displacement ratio decreases with the increase of the period of vibration dramatically for rigid systems and is generally independent of the stability factor and the normalized yield strength.