bluuebunny/crossref_metadata_2025 huggingface dataset:
Research on Simulating Optimization of Extended Penetrator
Authors: Dong Yu Cai , Du Zhong Hua , Liu Rong Zhong , Liu Jie
Published: November 2012

In order to further enhance the penetration merit, the extended structure has been improved and optimized. In this paper, the LS-DYNA code was employed for normal incidence simulation on several extended structures of the same mass. Target material is RHA603 at the speed between 1.47km/s to 1.77km/s. The numerical simulation results show that on the basis of the general extended penetrator of the merit was further improved by add connector structure. While at the speed of 1.57 km/s, transverse reflux was formed by the erosion of material in the course of its penetration. This greatly reduces the penetration efficiency. Then by the addition of plug,it makes the merit of extended penetrator greater stability and efficiency, the maximum merit was up to 18.1%.
Design of an Intelligent Controller for Control and Protective Switching Based on Profibus
Authors: Cai Zhi Yuan , Ai Hong Yuan
Published: November 2012

An intelligent controller with capable communication for control and protective switching device (CPS) based on Profibus fieldbus was designed. The system with the single chip microcomputer as the core realized the function of measuring, protection, controlling and communication between CPS and host computer by Profibus fieldbus. The design could not only realize real-time monitoring for running state of multiple electromotor but also set the protection parameters of CPS and alarm function online by interface, which made CPS have remote monitoring function.
Influence of Retainer Bearing Misalignment on the Performance of Active Magnetic Bearing
Authors: Li Hong Wei , Yu Wen Tao , Fan You Peng , Liu Shu Qin
Published: November 2012

The retainer bearing will be misaligned for mechanical errors, which leads to the uneven air gap of AMB and affects the performance of AMB. To study this problem, the electric-magnetic force model was built first with the misalignment of retainer bearing. With this model, the influences of the misalignment on the system stiffness, damping and damping ratio of AMB were studied through theory analysis and simulation based on the PID controller with low-pass filters. The study indicates that the system stiffness and damping ratio of AMB employing PID controller will increase with the increase of retainer bearing misalignment. The results provide certain references for the system structure optimum design, system debugging and fault diagnosis and performance improvement of AMB-rotor system.
Research on the Auto-Row-Aligning Technology of Root-Tuber Crops Harvesting Machine
Authors: Yang Ran Bing , Shang Shu Qi , Li Xin Cheng , Han Meng Fei
Published: November 2012

Root-tuber crops are buried under the ground, thus, the mechanization harvest should apply digging method. However, the row-aligning angle of the shovel can directly influence the digging effect. Therefore, a set of auto-aligning technological equipments were designed to solve this problem and achieve aligned digging. This paper mainly analyzes the design of above mentioned equipments as below: A right-left angular displacement sensor is added in the front part to achieve auto-induction and signal transformation of the digging angel through comparison of the pressure angle. The adjustment of the control equipment can be achieved by the adjustment of signal when it goes through magnetic exchange valve. And with the help of cross slide way, the digging harvest machine can modulate the shovel timely and efficiently. Experiments demonstrated that such auto-row-aligning equipment can improve the digging effect.
Fuzzy Adaptive Compensation Control for Robot Manipulator with Uncertain Dynamics
Authors: Chen Yuan , Tan Xiao Peng , Gao Jun
Published: November 2012

This paper proposes two types of adaptive control schemes combined by the conventional computed-torque control and different fuzzy compensators for the robust tracking control of robotic manipulators with structured and unstructured uncertainties. Fuzzy compensators based on feed-forward and feed-back are developed to compensate these modeling uncertainties. The validity of the two types of adaptive control schemes is shown by numerical simulations of a three link rotary robot manipulator.
Study of the Search and Rescue Robot’s Motion System in the Underground Environment
Authors: Li Juan , Li Shi Zhong , Guo Xiao Xue
Published: November 2012

For the unstructured extreme environment of coal mine underground accidents, this paper puts forward a multi section crawler search robots. Based on the analysis of the working environment of the robot, underground search robot of crawler - ground model is built , overall configuration of robot that can cross obstacles flexibly in the complicated unstructured environment is put forward, high mobility of walking mechanism and joint module are designed and simulate by simulation software MATLAB, which provides the basis for establishing systematic engineering prototype and completing engineering test result.
Migration and Storage Mechanisms of CO2 with Different Injection Rates
Authors: Yue Gao Fan , Tian Hai Long , Xu Tian Fu , Wang Fu Gang
Published: November 2012

Geological sequestration of CO2 in deep saline formations has been considered as an effective way to mitigate the greenhouse effect. With different rates of injection to a storage formation, the migration and storage mechanisms of CO2 are different. In this paper, we simulated the migration of CO2 based on a generic geological reservoir under simplified conditions. The results show that higher injection rate will lead to higher migration velocity and farther distance from the injection well, while it has no influence on dissolution amount when the total amounts of injected CO2 are equal.
Design of a New Nonlinear Excitation Controller Combined Differential Geometry with PID Theory
Authors: Sun Xiao Juan
Published: November 2012

This paper presents a nonlinear excitation controller for transient stability combined differential geometry theory with PID technology. The controller ties the output of linear multi-variable excitation controller with the output of PID. Exact feedback linearization theory of differential geometry is applied to the design of linear multi-variable excitation controller for the single machine infinite system. Simulation results show that, compared with the general differential geometric controller, the proposed controller has the better control effect on power system and which remarkably improves the terminal voltage deficiencies in the control of generator.
Design on Cooperative Control of the Wearable Exoskeleton and the Movement Behavior Prediction of Human Beings Based on EEG
Authors: Li Kai Yang , Zhang Xiao Dong , Meng Liang
Published: November 2012

BCI and exoskeleton robots were introduced respectively in the first, and then the advantage of BCI in the exoskeleton control compared with other control method was described. Hardware and software was designed respectively in the paper: in order to achieve the hardware portable that used for gaining EEG, Emotiv collecting device and radio devices was used in the designed; a new way to judge the intentions of human body movement based on cumulative average method and nonlinear dependent method was put forward. Furthermore, a variable factor- was proposed to realize the motion models prediction of different accuracy requirements.
NN-Based Adaptive Output Feedback Stabilization via Passivation of MIMO Uncertain System
Authors: Zhu Yong Hong , Yao Jie , Wang Jian Hong
Published: November 2012

An NN-based output feedback stabilization problem is studied via passivation of a class of multi-input multi-output nonlinear systems with unknown nonlinear input matrix and unknown parameters. Neural networks are used to identify unknown nonlinearities, and the update laws of weight parameters are proposed. The design methods of the adaptive passive controllers for this class of systems are discussed in the paper. The corresponding adaptive passive controllers and parametric adaptive laws are designed and presented respectively. It is proved that the closed-loop system composed of the original system and the designed controller is stable by the Lyapunov method, and the controller designed can render the closed system adaptive passive. Finally, a simulation example is given to prove the effectiveness and feasibility of the proposed method.
PFC Controller Based on Self-Adaptive Proportional-Resonant Control
Authors: Hu Yu Feng , Liu Bin , Liu Jun
Published: November 2012

Proportional-resonant is introduced in PFC controller design and the coefficients are easy to tune. Zero-tracking-error can be achieved for the fundamental frequency and selective harmonic compensation can be achieved as well. Also a novel Phase-Loop-Lock controller is given based on which a self-adaptive proportional resonant PFC controller is induced at last.
Research on Anti-Interference Measures for the Control System of Flow Calibration Facility
Authors: Han Yan Chao , Sun Li Jun , Wei Yan Xing , Li Sheng Jie , Niu Hai Shan
Published: November 2012

Eliminating or reducing the influence of electromagnetic interference to control system is the key problem to improve the performance of flow calibration facility. In the paper, the sources, the action principles and the propagation paths of electromagnetic interference were analyzed. Anti-interference measures to control system of flow calibration facility were investigated based on the New 2# water flow calibration facility at Tianjin University Flow Lab.
Research on Corner Matching-Based Video Localization by Robots in RoboCup
Authors: Deng Ben Zai , Cao Zheng
Published: November 2012

In this paper, a corner matching-based localization algorithm is brought forward, which refers to doing corner matching every two frames for the video documents generated in the operation of the robot and calculating the corner offset between two frames so as to realize the self-localization of the robot. It turns out in tests that the localization by this algorithm is featured by little error and high robustness
Setting Program of Dead Time with No Dead-Time Effect Based on Single-Cycle Control
Authors: Lu Xiang , Ma Jin , Hao Gang
Published: November 2012

Based on the studies of the problems occurred in using single-cycle control method to eliminate the electric Power Harmonic, this article proposes a new kind of general dead-time setting method with no dead-time effect and testify the effect of single-cycle controlled three-phase APF, for the problem of the dead-time in bridge inverter.
The Design and Realization of Control System for Underwater Vehicle
Authors: Tang Zhi Jie , Wang Shuai , Shen Jia Li , Luo Jun
Published: November 2012

This paper mainly describes the hardware and software design of an underwater vehicle, the underwater vehicle aims at researching how to cope many kinds of accidents in the shallow water, and then makes the underwater vehicle able to work well and stable in the shallow water.
Designing a Fuzzy PID Controller for Brushless DC Motor
Authors: Qian Yu Hao
Published: November 2012

Based on the mathematical model of the brushless DC motor (BLDCM), a self-adaptive fuzzy PID controller is designed to achieve high-precision speed control of motor by adopting fuzzy control principle, simulation is conducted in MATLAB /SIMULINK, the result shows that the controller can work well with quick response, no overshoot output and high control precision, has strong robustness under the circumstances of various disturbances and parameter variations, whose static and dynamic performance with the self-adaptive fuzzy PID control are both better than conventional PID control.
Performance Comparison of Standard Terminal Sliding Mode Control and Non-Singular Terminal Sliding Mode Control
Authors: Yang Fei , Wang Wu
Published: November 2012

Terminal sliding mode control (TSMC) was designed with introduction nonlinear function into sliding hyper-plane, which makes tracing error converge to zero in finite time. The standard TSMC (STSMC) control and non-singular TSMC (NTSMC) control was designed for an uncertain two-order nonlinear dynamic system, the sliding function and controller of STSMC control and NTSMC control are designed respectively, also the finite time of arrival was analyze. The stability was proved with Lyapunov theory, the performance comparison of STSMC and NTSMC was simulated with conclusions that STSMC control and NTSMC control are all feasible control for nonlinear system, STSMC control exist singular problem, but NTSMC control without singular problem, with sliding surface and control law with different parameters, the control characteristic can realized, which was suitable for special control system.
Technology and Mechanism of Valuable Metal Recovery from Pyrite Cinder by Chloridizing Roasting
Authors: Bai Shao Jun , Wen Shu Ming , Feng Qi Cheng , Chen Yu , Liu Jian
Published: November 2012

A new technology of pellet production-drying-chloridizing roasting is proposed for valuable metal recovery from pyrite cinder with high content of lead and zinc. The pyrite cinder, containing 60.15% Fe, 2.02% Pb and 2.15% Zn, was pelletized with addition of 2% bentonite in pan pelletizer. Green balls after drying were roasting at 1100 °C for 60 min with 5 wt % of CaCl2 addition in tube furnace. The results demonstrate that pellets with 61.58% of TFe, lead and zinc volatile ratios of 98.02% and 96.83% were obtained. Key technique is that CaCl2 reacts with lead and zinc compounds and the chloride can be volatilized at moderate temperatures. This new technology can recover the valuable metal fully from pyrite cinder and produce qualified concentrate as iron-bearing feed for steel industry, which will help to solve the pollution of pyrite cinder and extend raw material sourcing for Chinese steel industry.
In Situ Synthesis of CNTs/Mg Composite Powders by CVD at Low Temperatures
Authors: Sun Fu Jun , Shi Chun Sheng , Liu En Zuo , He Chun Nian , Zhao Nai Qin
Published: November 2012

The emphasis of this study was in-situ synthesis of carbon nanotubes (CNTs) on Mg matrix at 480°C. The process involves homogeneous deposition of Co catalyst onto Mg by deposition-precipitation route with low Co content (1.0 wt.%) and in situ synthesis of CNTs by chemical vapor deposition. The morphologies and microstructure of the as-obtained CNTs/Mg composite powders was characterized by SEM, TEM, Raman spectrum, and XRD. The results indicated that CNTs were well graphitized and uniformly distributed on the surface of Mg powders, which would be beneficial to the mechanical property of CNTs/Mg composites.
Development of the Manufacture Equipment for Resin Bonded Diamond Abrasive Wire Saw
Authors: Bi Wen Bo , Ge Pei Qi , Gao Yu Fei , Zhu Zhen Jie
Published: November 2012

This paper introduces the structure of the resin bonded abrasive wire saw manufacture equipment. The equipment can complete the process of the wire saw production, including uncoiling wire, cleaning wire, binder coating, Pre-curving and coiling wire. Wire saw are manufactured successfully by this equipment in the manufacture experiment. The quality of the wire saw was examined by SEM. The average slicing ability of the wire saw is 205 mm2 per meter in the experiment of KDP crystal slicing.
Study on Design of Cable Automatic Mounting Vehicle Structure
Authors: Liu Ji Xin , Hu Feng Ju , Wang Ji Dai , Xu Yuan Yuan
Published: November 2012

In the process of the coal technology development, anchor installation speed is one of the main factors that affect the rapid excavation. The anchor cable automatic mounting vehicle, which is developed on the basis of this, is a set of borehole, anchor installation, fastening, tensioning and other operations. It effectively improve the efficiency of anchor cable supporting. This paper mainly introduces the working principle, the main structure design and functional characteristics.
Study on the Aging Regularity of SWRH82B Hot-Rolling Wire Rod
Authors: Bao Jun Cheng , Zhao Jie , Ning Bao Qun , Li Jian Ping
Published: November 2012

Through study on the regulation of tensile strength and reduction of area after artificial aging and natural aging for SWRH82B wire rod, indicate that the tensile strength of wire rod unchanged through artificial aging or natural aging treatment while the reduction of area changes significantly the reduction of area is effected by aging temperature and aging time. Reduce the residual stress in the wire rod and lattice distortion is the main reason for reduction of area improving the composite brittle inclusions in the wire rod are not good for the rod plastic recovery.
Development and Application of the Tiger Punch
Authors: Sun Qin
Published: November 2012

During sheet metal processing, the price of the mechanical punch is cheap, but its noise is too big, the price of CNC punch is too expensive, so it isn’t suitable for small and medium-sized manufacturers as well. A kind of hydraulic punch which has convenient operation and low price is developed. And design process of mechanical part, X axis and Y axis blocking material design, hydraulic system and electrical system are introduced in the paper.
Development of Handheld Ultrasonic Spot Welding Machines
Authors: Zhu Wu , Jiang Chao , Zhu Jia Min , Wang Yong , Zhang Jia Min
Published: November 2012

As the resonance frequency of the ultrasonic vibration system drifts according to the different operating condition, Ultrasonic power supply based on MSP430 is designed in this thesis. Series inductance and parallel capacitance are used to match the vibration system and series resonance technology used in primary side of inverter transformer can reduce switch loss. ADC module in MSP430 is used to get frequency shift, and PWM module is made to adjust the operating frequency of TL494, which can realize closed loop control of frequency tracking. The results of experiments show that the method designed in this thesis has high detection accuracy, high speed dynamic response and high stability of frequency tracking.
Research and Practice on the Process Cost Estimation Based on Features and Intelligent Computation of Locomotive Axle
Authors: Sun Li , Lu Peng , Ma Zi Qin , Wang Xiu Lun , Qi Guang Wei
Published: November 2012

In the production process, the cost estimate has a direct impact on the product design and economic efficiency. The establishment of process cost estimation model based on features and intelligent computation can quickly and accurately estimate the process cost of product with high precision. In the condition of poor basic data and inadequate labor power, material and financial resources, carry out the study and practice on the locomotive axle process cost estimation based on features and intelligent computation from the product process. This method can quickly estimate the cost of the product with a high use value.
A Surgical Training Biomodel Manufacture Using Fused Deposition Modeling
Authors: Way Yusoff , Hasanudin Hafis Mohamad Ali , Md. Shukri Md. Amir Hamzah
Published: November 2012

The purpose of this research is to fabricate maxillofacial biomodel and apply the rapid prototyping technology using Fused Deposition Modeling (FDM) in solving some surgical problem in medical field. The build biomodel will be used in educational and pre-medical surgical environments. Besides, it can simplify the complex surgical procedures and the visualization of anatomical structures. A machine that works under FDM principle will be used to produce a finished biomodel. Product analysis later is implemented to make the result more trustful. Thus, it is demonstrated that biomodel can help surgical planning and at the same time it will reduce costs, surgical times and infection risks in health care system.
Study of Hydrodynamic Characteristics of the Sloping Breakwater of Circular Protective Facing
Authors: Zhao Li Ping , Zhang Jian Qiu , Chen Lei , Xie Xuan , Cheng Jun Qiang
Published: November 2012

Studying the hydrodynamic characteristics of the sloping breakwater of circular protective facing by physical model test and taking a numerical simulation analysis of current field around the circular protective facing with holes under wave action by FLOW—3D.
Effect of Unsteady Wake on Flow Control of the Low-Pressure High-Lift Cascade with Synthetic Jet
Authors: Xie Yong Hui , Qu Huan Cheng , He Hai Yu
Published: November 2012

The flow separation is susceptible to appear and is known to affect the aerodynamic performance of the low-pressure high-lift cascade. Large Eddy Simulation was adopted in the present work and the periodic moving bar was employed to simulate the unsteady wake upstream of the blade. The flow control of the synthetic jet with unsteady wake was investigated in detail. The upstream wake increased the turbulent level of the boundary layer of the cascade. The synthetic jet got a better control under the effect of the upstream wake.
Optimization Analysis of Height and Distance for Shelter Wind Wall of High Speed Railway
Authors: Ye Kun , Li Ren Xian
Published: November 2012

Shelter wind wall is one of the most effective devices to reduce crosswind loads acting on trains. The height of the wall and distance between the wall and the center of railway are important factors for design and construction of wind wall. Since the wall design is related to many factors, such as train speeds, transverse wind speeds, types of the wall and so on, up to now, there are still different judgment methods in the optimal height and distance of the wall to get minimum aerodynamic forces on the train. Based on numerical analysis methods of three-dimensional viscous compressible aerodynamics equations, aerodynamic side forces and rolling moments acting on the train are analyzed. With 275 calculation models, include the straight and different radius curve railway with different heights and distances of shelter wind wall, the aerodynamic side forces and rolling moments are calculated. Simulation results show that the optimal height and distance of the wall are not the same during in straight and curve railway. And the direction of aerodynamic side force and rolling moment acting on the head and rear train may be different. The change trends of transverse forces (moments) with the height and distance of the wall are also different.
The Study on Supply Air Pressure of Surface Supplied Diving System Based on Bernoulli’s Equation
Authors: Xue Yan Hua , Wang Zhi Guang , Shao Bin , Duan Yu
Published: November 2012

Surface supplied air diving includes those forms of diving where air is supplied from the surface to the diver by a flexible hose. The Surface Supplied Diving Systems (SSDS) are used primarily for operations to 190 feet of seawater. For the safe of surface supplied diving operation, the gas flow and gas pressure of SSDS must be ensured. Based on the hydrodynamic equations of high-pressure gas hose flow, the basic equation for high-pressure gas flow of surface supplied diving system is analyzed, according to which the gas pressure, gas flow and umbilical basic parameters of surface supplied diving operation are affirmed.
Absolute Nodal Coordinate Formulation for Aeroelastic Analysis of Panel
Authors: Abbas Laith K. , Rui Xiao Ting , Marzocca Piergiovanni
Published: November 2012

This paper deals with supersonic/hypersonic flutter analysis of panels. A 3-D rectangular plate element of variable thickness based on absolute nodal coordinate formulation (ANCF) has been developed for the structural model. A continuum mechanics approach for the definition of the elastic forces within the finite element is considered. Both shear strain and transverse normal strain are taken into account. The aerodynamic force is evaluated by considering the first-order piston theory to linearize the potential flow and is coupled with the structural model to account for pressure loading. A provision is made to take into account the effect of arbitrary flow directions with respect to the panel edges. Aeroelastic equations using ANCF are derived and solved numerically. Values of critical dynamic pressure are obtained by a modal approach, in which the mode shapes are obtained by ANCF. A detailed parametric study is carried out to observe the effects of different flow angle directions and aspect ratios on the flutter boundary.
Sliding Ropes Brake Device of Friction Hoist Machine Design and Application
Authors: Zhao Qiang
Published: November 2012

In the sight of friction hoist machine transmission characteristics, analysis of the possibility of friction hoist machine sliding ropes phenomenon, sliding ropes phenomenon can be divided into safety slide and dangerous slide two states. In order to avoid the occurrence of the friction hoist machine container overwind, overfall major accident caused by steel wire ropes dangerous slide, using two encoders to sample the speed of friction hoist machine wheel and the actual speed of steel wire ropes, concluding and analyzing the sliding ropes state of friction machine, according to the hoist container position and sliding ropes trend when the steel wire ropes of friction hoist machine start to slide, determining the dangerous state of sliding ropes. Designed the sliding ropes hydraulic brake device, with the adjustable sliding ropes brake torque and fast dynamic response control function, preventing the hoist container overwind, overfall major accident, as the same time, minimizing the machinery injury to the steel wire ropes when the sliding ropes are braked, realizing flexible sliding ropes brake.
A Perturbation Analysis of the Fully Developed Convective Heat Transfer inside a Longitudinal Corrugation Channel
Authors: Shi Jin Sheng , Zhang Qiao Zhen
Published: November 2012

A theoretical research of the flow and heat transfer inside two longitudinally corrugated tube is carried out. An approximate model is presented by applying perturbation expanding to the governing flow and energy equations. Obtaining the solutions, effects of the amplitude and number of the wave surface of the corrugated wall on the flow and heat transfer are discussed.
Analysis of Temperature Field of Nuclear Canned Pump and Thermal Deformation Calculation of the Shielded Can
Authors: An Yue Jun , Guo Chun Ye , Liu Guo Ming , Xue Li Ping
Published: November 2012

In order to find out the reason for deformation,cracking and leakage of the shielded can of nuclear canned motor and put forward the solution,a finite element model of 2-pole and 8kW canned motor in temperature field was created. Assigned materials and boundary conditions to each component and calculated the temperature distribution of the canned motor by equivalent heat source load method and display the distribution visibly.By combining with the temperature field data,obtained the temperature characteristics of the shielded can and calculated the thermal deformation based on the maximum temperature.The result of analysis show that the temperatures of each component are different,shielded can’s temperature rise is not uniformly distributed along the circumferential direction and the degree of thermal deformation along axial direction is larger than that along radial direction.The conclusion of this paper is conducive to understand the temperature distribution in canned motor and characteristics of thermal deformation in shielded can clearly,and provides an important theoretical basis for the development of new shielded can structure.
Experimental Study on Ultrasonic Vibration Drilling of Titanium Alloy Micro-Hole
Authors: Liu Zhan Feng , Zhang Huan Chang
Published: November 2012

Through the analysis of the basic principles of vibration drilling and vibration drilling process, in the drilling device and the cutting parameter sides , combined with the actual structure of the workpiece as well as the ultrasonic vibration drilling processing methods to elaborate, using the ultrasonic vibration drilling device to carry out the TC4 titanium alloy micro-hole drilling test. The test prove that selecting reasonable cutting parameters can solve the problem of drillingTC4 titanium alloy micro-hole that size is Φ1.5mm × 12mm , fully reflects the superiority of the ultrasonic vibration drilling. A new method was afforded for titanium alloy micro-hole drilling.
Test of Reliability of Micro-Accelerometer in Vibration Environment
Authors: Ma Xi Hong , Li Chang Long
Published: November 2012

In order to quickly determine the weak links of micro-accelerometer in vibration environment, the test profile of step stress and sustained stress were designed in the vibration environment on micro-accelerometer, the relevant reliability enhancement test was actualized for micro-accelerometer of 10g, the failure time was given in the sustained stress. The failure mode and failure mechanism were analyzed by detailed test results, the ANSYS software was used to simulate the move route and stress distribution of cantilever beam in the conditions of being adhesion strength and without it. According to the step stress test and constant stress test of RET, the various stress limit, the relevant failure mode and the failure mechanism were given in the vibration environment.
Slender Pipe Vibration Cracking Analysis and Vibration Reduction Measures
Authors: Ding Yu Qi , Liu Ju Bao
Published: November 2012

Analyzes that the ammonia plant of a fertilizer between rich liquid line and ammonia synthesis tower of pressure pipeline vibrates some reasons, through the establishment of the pipeline and tower body vibration finite element model, the calculation of the existing constraints stress, vibration frequency and vibration form. By adding a support level and put forward the reconstruction plan of vibration reduction. Through many calculation and analysis, the weld seams stress reduced by 23.6%, the maximum amplitude dropped 98.5% and obtain the better vibration reduction transformation effect.
Improvement of Laminar Shear Container for Shaking Table Test
Authors: Sun Hai Feng , Jing Li Ping , Wei Qing Hai , Meng Xian Chun
Published: November 2012

Shaking table test is an important method to study on the problem of the soil-structure dynamic interaction. The property of the soil container directly affects the accuracy of the result. A laminar shear container was designed for shaking table test. And a shaking table test on soil-underground structure dynamic interaction which structure lay in clay was conducted. The results of the test show that the container eliminated the boundary effect when the dynamic load was applied in only one horizontal direction. Meanwhile, the stiffness of the soil container could be changed according to the change of the model soil, which is applicable to decrease the boundary effect.
Structural and Hydraulic Design of Mechanical Pump Using in LBE Test Loop
Authors: Gao Bo , Yang Min Guan , Sun Xin Kai , Zhang Ning
Published: November 2012

In order to design a mechanical pump that can satisfy the special requirements of the LBE test loop, structural and hydraulic design ideas were discussed in this paper. A new vertical centrifugal submerged pump was proposed, including installation and hydraulic model. Based on the provided parameter, hydraulic design of the pump has been done by CFD method. Velocity caused erosion problem was considered primarily in the design process. It is helpful for the future design of pumps in various loops and ADS.
A New Soil Classification Method Using Normalized CPT/CPTU Parameters Based on Modified Bayesian Model
Authors: Miao Yong Hong , Yin Jie
Published: November 2012

Soil classification results from CPT/CPTU always involve the uncertainty of correlation between mechanical behavior and soil composition. For better processing large quantities of tests data obtained form CPT/CPTU, Modified Bayesian model was introduced and corresponding soil classification method was proposed. The validity of the new method was verified through local silt samples. Evaluation results also suggested that the proposed new soil classification method had well applicability.
Stability Analysis of Grouting Strengthening in the Goaf Underlying a Canal
Authors: Lu Wen Yan , Zhang Xiao Xin , Li Wen Qian , Tong Da Wei , Wang Xiao Ling
Published: November 2012

In this paper an old mining goaf in Henan province is studied with the application of 3D nonlinear finite element method. The excavation and backfilling construction and water conveyance operation of the canal upper the old mining goaf is analyzed. Simulation results show that after the grouting strengthening, no layers exceed corresponding strength limit under both canal construction and operation conditions, meanwhile the surface movement and the size of the deformation are within the scope of the standard and won’t affect the construction and safety operation of the canal.
Analysis on Rock Mass Around an Underground Crude Oil Storage Caverns in Containment of Groundwater Considering Fluid Solid Coupling
Authors: Yang Shang Yang , Zhang Long Yun
Published: November 2012

Triaxial compression tests have been performed to determine the properties of the rock mass around an unlining underground crude oil storage caverns which is the first one in China. The execution situation of the tunnel project and the seepage law of groundwater are taken into account; the stress and the seepage field around the tunnel in different working states are simulated by applying Comsol around a underground crude oil storage caverns.According to the test results, it was found that the excavation process may arise the local damage,the extension of the excavation induced loose zone ranges from 0 to 15.6 m, depending on the buried depth of the caverns. According to numerical simulation results, the crown settlement and stress concentration is depended on the buried depth and the water pressure distribution after the excavation of the main cavity. This research results can provide the reference for analysis on the stability of the underground cavities under low stress level and on the water sealed underground petroleum storage rock caverns.
Geohazard Risk Assessment Method Based on Logistic Regression Model
Authors: Cheng Si , Wang Yun Sheng , Chen Fei Yu
Published: November 2012

Logistic regression model refers a regress analysis contains two types of variants. In geohazard analysis, each geological factor can be defined as independent variable, whether a geohazard happened or not can be defined as a dependent variable. 1 represents an occurrence of a hazard while 0 represents a hazard doesn’t break out. Because those factors aren’t continual variable, lineal regress is inadequate to deduce the relationship of such kind of independent and dependent variable. Therefore using logistic regress method is a feasible way to solve such technique problem.
Motion Analysis and Research on Mobile Swing Type Manipulator
Authors: Tao Ke , Liu Xing
Published: November 2012

The working space and the end-effector pose of the two degrees of freedom mobile swing type manipulator are analyzed, through homogeneous coordinate transformation to establish the transformation relationship between operating space coordinate and each joint space coordinate, derived the end-effector pose matrix , using the inverse transformation method to seek motion reverse solution. Application of linear interpolation theory, doing trajectory planning for arbitrary movement path, show manipulator in its working space can realize arbitrary trajectory.
Resist Liquefaction of Subsoil of Metro and Improvement of Segments of Shield Tunneling
Authors: Chen Wen Hua , Song Qi , Li Meng
Published: November 2012

Nanjing’s metro is studied as a example to introduce resist liquefaction method in this paper. Dynamic diffuse theory of structure is supposed to evaluate the width and depth of foundation treatment to resist the seismic liquefaction to think of metro structure, liquefied soil layers and different liquefaction-index. High pressure jet grouting method is researched as shield machine construction through foundations of buildings or ancient wall. An improved segments of shield tunneling method is suggest to ensure the resist liquefaction method to success.
Analysis to the Whiplash Effect in the Engineering Structure
Authors: Liu Jun
Published: November 2012

In the building structure, the quality and stiffness of the outthrust compared are very small compared with the main structure. When k1>> k2, M1 >> M2, and the value of K1 / k2 is approximate the value of M1 / M2, it is prone to whiplash effect. This paper analyzed whiplash effect phenomenon because of various vibration, proposed the measures which should be taken to avoid the whiplash effect.
Numerical Simulation of Building Strength when Foundation Subsides Unevenly
Authors: Ma Jing , Zhao Jun , Zhao Yu Ling
Published: November 2012

A building structure is analyzed using finite element method. The stresses and strains of the structure are calculated numerically, when the foundation subsides unevenly. Thus, the effect of the sedimentation is evaluated. The results can be referenced in the evaluation of building structures.
Research and Application of Collaborative Modeling for Prefecture-County Integrated System Based on Workflow Engine
Authors: Wu Mei Ling , Liang Cheng Hui , Wang Liang
Published: November 2012

In order to implement the information flow and verification process in collaborative modeling for prefecture-county integrated system based on workflow, the workflow engine is embedded in the system. On the base of the Workflow Management Coalition Specification and Common Object Request Broker Architecture (CORBA), the paper describes the way to implement the workflow engine, interface service between the engine and CORBA middleware, and the automation of the verification process in the prefecture-county integrated system.
The Behaviors of Internal Solitary Waves near the Continental Shelf of South China Sea Inferred from Satellite Images
Authors: Huang Xiao Dong , Tian Ji Wei , Zhao Wei
Published: November 2012

The behaviors of internal solitary waves (ISWs) near the continental shelf of SCS are analyzed. We interpret manifestations of four kinds of ISWs in MODIS images: mode-1 depression wave, bolus, mode-1 elevation wave, and mode-2 convex wave. The geographical distributions of these ISWs are investigated. Bolus and mode-1 elevation wave, the two evolution stages of polarity conversion process of depression ISW, only exists around 22˚N, which is in agreement with the sign of mode-1 nonlinear coefficient α1. The mode-2 convex waves generally follow the southern part of mode-1 depression ISW, where the steep terrain favors their generation. The information of a mode-1 depression ISW, such as amplitude and propagation speed, is also derived from the MODIS image.
The Deposit Features and Comprehensive Information Prospecting Model of Mengyejing Potash Deposits in Yunnan Province
Authors: Yue Wei Hao , Gao Jian Guo
Published: November 2012

Mengyejing potash deposit lies in brown-red and variedness salting-in nagelfluh formation of Cenozoic Mengyejing formation which is located at the back-foreland basin of Lanping-Simao bidirectional arc zone, and it is one of the few large-scale solid potash deposits in China. By integrated study systematically, Mengyejing Potash Deposit’s different scales of mineralization geological anomalies information:geological, geophysical, geochemical, and salt spring chemistry and remote sensing were extracted. A comprehensive information prospecting model of Mengyejing potash deposit is established. Tentatively identified deposits prospecting model of Mengyejing formation, negative gravity anomaly, salt spring chemical anomaly and geochemical anomalies as the core and is of a positive significance for this type of deposit’s prospecting.
A Study of Crime Predictive Modeling Using a Variable
Authors: Chung Young Suk , Choi Hae Gill , Kim Jin Mook , Park Koo Rock
Published: November 2012

Modern society is experiencing a variety of crimes, and the damage caused by crime is increasing. So, to prevent crime, to understand the various studies are in progress. However, due to the change of time to predict the incidence of crime research and crime happens there are few studies on the social environment. In this paper, predictive modeling for time changes the crime was investigated. And social changes in the environment a variable predictive modeling to improve accuracy by applying the crime that was investigated. In this paper, the change of social environment, crime, apply predictive modeling to forecast the exact crime is expected to be used.
The Modification and Design Method of Large Gear
Authors: Wang Hai Xia , Zhang Lei
Published: November 2012

Due to the difficulty in large gear modification, a method that modifying gear tooth in the processing through correcting gear cutter was proposed. In this paper, modification theory of large gear and design method of gear cutter were introduced in detail. Based on gear meshing theory, the tooth equation of large gear was deduced from the equation of correcting cutter. The processing was simulated by using Matlab software, and it verified the validity of theoretical analysis.
The Design of a Device for Burning Biomass as Straw and Brushwood
Authors: Zhang Zhi Ying , Lu Jia Hua
Published: November 2012

A special hand-grate boiler burning biomass of straw and brushwood with natural ventilation is introduced. The tested thermal efficiency of the boiler is higher than 61% and has good potential of energy saving and environmental protection, thus meets the need of heat supply under operation condition. A wide market of the boiler in remote regions is expected.
Study on Electrical Ignition Characteristics of HAN-Based Liquid Propellant Spray
Authors: Yu Yong Gang , Lu Chun Yi , Zhao Na , Lu Xin
Published: November 2012

In order to study the electrical ignition method of liquid propellant spray, two experimental devices of liquid propellant spray and alternating current (AC) pulse discharge were designed. By using of high speed digital camera system, the test on electrical ignition of HAN-based liquid propellant LP1846 spray were carried out under different injection pressures. The results show that under 50W AC pulse discharge conditions, LP1846 droplet cluster, with the mean diameter in the range of 20~40μm, can be ignited reliably. Based on above experiments, a simplified model of ignition delay time of LP1846 single droplet was set up, the calculation value is well matched with the experimental data.
The Study of HEV Special Two-Stage TWC Characteristics
Authors: Chen Ling Yun , Du Jia Yi , Yuan Yin Nan , Zhu Lei
Published: November 2012

As there are many shortcomings for the traditional three-way catalyst (TWC),too large thermal inertia ,low heat capacity and poor thermal insulation properties .A new hybrid vehicles special two-stage TWC is designed.The experiment was carried out at drum test bench and frequent start/stop cycle condition.The result shows that the first-stage catalyst core temperature was maintained at 450°Cafter engine stop 200s, the peak value of HC emissions is only exist at the beginning 30 sec and the conversion efficiency of NOx up to 90% .The hybrid vehicles special two-stage TWC fully meet the frequent start / stop and transient cycle conditions requirment.
Numerical Simulation for Erosion Thinning of Pipes in Petrochemical Plant
Authors: Guo Chun Li , Wang Hui , Qian Xiao Long , Zhou Tian Xu
Published: November 2012

Numerical simulation of pipeline flow field was performed with CFD method and the factors of erosion thinning were analyzed. According to result of calculation, exact location of pipe thinning was predicted. The result shows that the prediction is in agreement with the actual instances, which provides reference for the inspection and maintenance of pipes along with the optimal design of pipeline system.
Radiant Panel Columns Magnetostrictive Transducers of Forced Vibration
Authors: Sun Jian Ping , Wang Jian Xin
Published: November 2012

the columns of magnetostrictive transducer for the object, the establishment of a Radiant Panel in magnetostrictive rods through the spring of motion model, gives a method for solving first-order analysis and solutions, discusses the spring rate on radiation effect of amplitude. On reasonable determination of Radiant Panel structure, the size of the transducer, and optimization methods.
A Power Network Partitioning Method Based on Local Similarity Measure
Authors: Wang Tao , Zhou Heng , Zou Pan
Published: November 2012

A power network partitioning model based on the weighed local similarity measure is presented in this paper considering the regional decoupling characteristics of reactive power. A weighted graph model of reactive power network is established and a new measurement of local similarity based on weighed graph is defined. To utilize our measurement of similarity to partition reactive power network, a partitioning algorithm based on generalized ward hierarchical clustering method is proposed. The algorithm can ensure balance of the reactive power inside partition. Applying the proposed algorithm to IEEE 39-bus system, the results show that the proposed algorithm is feasible and effective.
Research and Application of BP Neural Network in Specific Power Harmonic Detection
Authors: Wang Xiao Dan , Ma Li Xin , Wang Yue Xiao , Yuan Shu Juan
Published: November 2012

APF (Active Power Filter) is widely used in power system harmonic control and reactive power compensation, has been proven as an effective method to overcome various power quality issues such as unbalanced source current, large reactive power harmonic and neutral currents due to the proliferation of nonlinear loads. Optimizing the performance of APF using conventional ip-iq detection method based on instantaneous reactive power theory is quite difficult because of the complex coordinate conversion, what’s more, the presence of low-pass filter will cause a certain delay. This paper proposes the implementation of BP neural network to extract specific harmonic, it can optimize the APF performance for load compensation under distorted supply voltage condition and sudden load fluctuation. Weight adjustment using the BFGS quasi-Newton algorithm, which can accurately detect the fundamental and harmonic component of the phase amplitude . Matlab simulation results demonstrate that the performance of BP neural network algorithm is superior compared to conventional method, in terms of both convergence rate and solution quality.
Pattern Recognition for UHF Partial Discharge of Power Transformer Using LS-SVM
Authors: Yuan Jin Sha , Shang Hai Kun
Published: November 2012

Partial discharge diagnosis is an important tool for detecting insulation defects in power equipments. This paper presents a pattern recognition approach based on Least Squares Support Vector Machine (LS-SVM) for Ultra High Frequency (UHF) partial discharge diagnosis of power transformer. Six different feature parameters were extracted from the data obtained from Partial Discharge (PD) on-line monitoring system. LS-SVM was used to discriminate between 4 different PD sources. Experimental results demonstrate that the proposed approach has higher recognition accuracy compared with traditional BPNN recognition method under condition of small samples, and has great potential for use of field data.
Study on Harmonics Suppression of High-Power Rectification Circuit Based on Saber Simulation
Authors: Wei Xiao Bin , Lu Song , Shi Hua Jie , Wu She Hua
Published: November 2012

It analyzed the quantity of differ-harmonic in the output from vary pulse rectification circuit. Considering the problems of great voltage fluctuation and high harmonics content in the rectification output under the direct-supply of current source mode, put forward the method of 12-pulse rectification circuit with equilibrium rector circuit with equilibrium reactor into direct-supply of current source mode. From the simulation results it can be summarized that 12-pulse rectification circuit with equilibrium reactor can not only smooth the output but also suppressing the harmonics.