bluuebunny/crossref_metadata_2025 huggingface dataset:
Key Technologies for Development of Track Utilization Decision Support System in Railway Passenger Stations
Authors: Zhang Ying Gui , Lei Ding You
Published: March 2013

Development of track utilization decision support system (TUDSS) is one of the most important component parts for realizing decentralized and self-regulated control in railway passenger stations. The system can provide technical and decision supports for dispatchers to solving track utilization problems (TUP), and its development thus needs many key technologies. Furthermore, we analyze and further put forward real-time dynamic adjustment technology, object-based graphical block technology, cross time span consistency processing technology, carrying capacity of station throat calculating principle and also other key technologies to help to develop the system and realize its functions. Moreover, its trial test results show that the system can make and adjust track utilization plans effectively and fast, and meet the diversified practical needs for TUP in passenger stations.
Army Unit Warfare Simulation Experiment by Using Agent Technology
Authors: Liu Xiang Gang , Wang Hao Jun , Dong Fei , Li Xiong
Published: March 2013

The use of agent-based simulation experiment technology throughout the concept development process and simulation implementing may have a direct impact on the Army’s ability to resolve these critical force structure issues, inform the acquisition of future combat platforms, and determine the future use of new-style vehicles in an Army force. Thus, Army unit warfare simulation experiment by using agent technology is studied in this paper. The warfare task(s) expression is presented and warfare entity agent model is designed. Through an agent-based simulation experiment platform, EINSTein, the demonstration system is established and Army unit warfare simulation experiment is implemented, by which some results are obtained. Simulation experiment proves the feasibility and efficiency of our model and simulation experiment system, and shows its advantages in realizing real-time tactical warfare activities simulation.
Reliability Evaluation of Ship Driver Based on Failure Mode Effects and Criticality Analysis
Authors: Xu Xiao Li , Liu Qing , Zhu Bo Qiang
Published: March 2013

Since human error accounts for more than 70% in the causes of maritime accidents, the analysis of human error mode will benefit the scientific analysis and evaluation of maritime traffic safety management, to get the nature security finally. With the application of Failure mode, effects, and criticality analysis （FMECA）, this paper sums up ten specific human failure modes. After the analysis of the modes based on materials from British Maritime Commission, it uses the Criticality Analysis （CA） to analyze the major mode of high hazard. The result has important guiding significance and value on refining the main hazards of maritime accidents, and the nature of maritime management.
Dynamic Simulation of Automatic Feeding Punch Mechanism Based on ADAMS
Authors: Di Ya Peng , Wu Hai Tao , Liu Hong Bin
Published: March 2013

Established the 3D model of the automatic feeding punch mechanism in SolidWorks and imported it into ADAMS to make dynamic simulation. Kinetic curves of the actuating mechanism were measured. These curves show the cooperation between the pressing mechanism and the feeding mechanism is well. The transmission angle and working length were measured. Calculated the coefficient of travel speed variation is 1.77 and the required power is 1.7KW. Finally, choose the type Y100L1-4(2.2KW) motor in the given resistance. The results show the mechanism can fulfill the anticipative design requirements and successfully verify the feasibility of the design project.
The Simulation of Rotary Motion of the Flexible Multi-Body Dynamics of Tower Crane
Authors: Gao Rong , Yang Jing , Luo Gang , Yan Cong Xun
Published: March 2013

Based on Dynamics of Flexible Multi-body theories, the flexible multi-body model of tower crane is established, by using the module of ADAMS/FLEX. The vibration characteristics of tower crane is analysed during the case of braking slewing motion by introducing the modal neutral file of tower crane flexible jib and mast. Advices are given in this paper for the dynamic analysis and the control design of tower crane.
Thermal Characteristics Analysis of Aerostatic Direct Drive Rotary Stage
Authors: Zhang Cong Peng , Li Mei Bo , Luo Xue Ke
Published: March 2013

A precision air bearing rotary stage driven by direct-driven motor is proposed. The structural characteristic of the rotary system is introduced, and the mechanism of structural thermal deformation and heat dissipation of aerostatic direct drive rotary stage were analyzed. The simulation models of static and transient temperature field are built, and thermal-structure coupled filed is calculated. The internal steady thermal field diagram and key nodes temperature curve of the rotary stage are obtained. Based on the temperature analysis results, the rotary stage structural deformation is established. The cooling method is provided, and result shows that the cooling way is effective.
350km/h EMUs Light Frame Model Reconstruction Technology
Authors: Qu Bao Zhang , Peng Hui , Wei Wen Yi
Published: March 2013

As the EMUs (Electrical Multiple Unit) light frame structure, combined of many complex surfaces, building its geometric model directly is a big challenge. Reverse Engineering Technology is adopted to make the light frame redesign. Considering the characteristics of the frame surface with big curvature changed, irregular contours of structural features and IGES based model, authors proposed the model reconstruction method, by using independent geometric module in Pro/E. Firstly, establish base planes from IGES file, then duplicate light frame surface from IGES file to generate a set of intersection curves with the base planes and surface duplicated above as mixed guide curves. After that, curvature analysis technique is presented for intersection curves precision check. And finally, the 3D model is reconstructed by boundary blend technology. The original data imported can be removed from this model in order to support parts redesign as well as their manufacturability analysis. Research outcomes above offer an efficient innovation solution for surface reconstruction with curvature changed dramatically and IGES based model as well.
Study on Modeling Technology Based on Polygon Transform
Authors: Chu Wei Jun , Zhou Jian Zhao , Tu Qun Zhang , Lai Si Wei , Dai Ju Ying
Published: March 2013

As one of the 3D modeling key technology, polygon transform have some operation and manipulation methods which can be applied neatly and confirmed by the characteristic of practical model. Polygon transform methods such as inserting vertex, inserting polygon, extrusion, transition join, triangulation and iterative triangulation algorithm and so on are discussed by using practical examples of reverse modeling in this paper. The experiment results show that using these methods synthetically have an effect on constructing and transforming complicated 3D model. We can thin polygons, redefine new local models, extrude polygon outwards or inwards and largen or reduce selective polygon borderline, form a new rolling polygon which joins on the original model, and subsection polygon into triangles by defining new borders inside the polygon.
Reverse Modeling Analysis and Design on Rubber Sealing Element in Spherical BOP
Authors: Zu Hai Ying , Tian Mi , Han Jia Xuan
Published: March 2013

Spherical BOP is one of crucial equipments in snubbing operation well in petroleum industries, with its core element of rubber sealing element, the connection between the spherical surface of metal skeleton and the rubber is irregular surface, it is difficult to determine the model by manual surveying and mapping. The paper put forward a design method on spherical bop rubber sealing element with the reverse engineering technology. Through the analysis of the reverse surveying and mapping basic requirements on spherical bop rubber sealing element, determined its data acquisition path and process spherical, and puts forward some solutions to the data merger, data transfer and the method of pixels processing.
Finite Element Analysis and Improvement of Spindle Box of Machining Center VM1806H
Authors: Gong Xiao Xin , Lu Qiang
Published: March 2013

Taking a large vertical machining center spindle box as research object, its three-dimensional model is established by using Pro/ENGINEER software. Due to the seamless integration between ANSYS Workbench and Pro/ENGINEER, ANSYS Workbench is used to structural analysis of static and dynamic characteristics of spindle box. It has been achieved which includes static stress, deformation, inherent frequencies and vibration mode. Based on the analysis results, improvement scheme for spindle box structure has been proposed and validated. This study provides theoretical basis for design and improvement of machining center spindle box.
Study on Controllable Prestress of the Block in the FDSO Bottom with the Supports Adjustment
Authors: Wang Fei , Zhang Yong Kang , Wang Yun , Ni Tao , Zhuang Jian Jun
Published: March 2013

We proposed the method of controlling the block prestress in the FDSO bottom with the supports adjustment. In FNTM of FDSOs, the FDSO bottom is built on the semi-submersible barge deck, in which the supports adjustment will cause different force imposed by the block weld, and we define this force as the block prestress. When you know the possibility block force in the future, you could exert a reverse force by the supports adjustment, which could reduce the block wreck possibility in extreme situations. Finally this method is applied to build the Sevan Driller FDSO bottom.
Simulation Study the Movement of Materials in Loader Shovel Working Process Based on EDEM
Authors: Huang Peng Peng , Xiao Xi Zhou
Published: March 2013

By application of the theory and methods of discrete element, a loader loading process three-dimensional simulation model was established, the simulation model established in EDEM software realized the visualization of loader inserting process. By three different particle size materials inserting process simulation, material motion characteristic could be obtained and the laws of motion of different size material were compared. Simulation results show that regardless of the particle size, compaction zone (dense core) were generated. For small particles, during insertion of the material there was a distinct shear slip plane and for coarse particles, slip plane was not obvious. The simulation results were consistent with the results of previous analysis and verified that the discrete element method and the model in the loading process were effective in the study.
The CFD Analysis of Exhaust Runner for GW15 Gasoline Engine
Authors: Ma Zhi Hao , Chen Xiao Pei , Gao Ding Wei , Xu Bin
Published: March 2013

In order to improve GW15 gasoline engine’s power and economy, AVL BOOST/FIRE software has been applied to the simulation of the engine’s one-dimensional and coupled 1D-3D simulation. First, optimal length of exhaust runner was obtained by simulation with BOOST, and proposed two types of structures schemes. Then, the better one was selected for BOOST and FIRE coupling in order to further optimize the exhaust runner according to the numerical simulation results. Finally, the engine performances were verified through experiment. The results indicate that both the engine’s maximal torque and maximal power increase, specific fuel consumption decreases.
The Discrete Particle Simulation of Vibration Sieve Based on CUDA
Authors: Hu Bin Xing , Huang Ya Yu , Shi Jun , Chen Zhao Hui
Published: March 2013

In the process of screening, the screening efficiency and sieving rate calculations are traditional and based on the probability and statistics method in the past. Using CUDA technology which has characteristics of high degree of parallelism, multithreading, powerful computing capability and high memory bandwidth and discrete element method, it is convenience to simulate the movement of massive particles in the process of screening. On the basis of previous works, the feasible way of discrete element numerical calculation methods can be found and efficient simulation of particle movement could be designed in order to provide a basis for the future transformation.
Weight Reduction Design Methods of Wring Based on Load Spectrum
Authors: Chen Qing Lin , Lin Shao Fen
Published: March 2013

The hydraulic systemic load spectrum of wring has been constructed by time with press and flow rate under deferent working condition on ship. The root mean square value of reel axial torque was calculated by weighted processing and was taken for the basis of the calculation on structure critical load. Based on the block of load spectrum, the virtual fatigue calculation showed the relation about the static strength and critical load block of load spectrum. Keeping the ratio of the static strength and critical load, the force analysis of wring reel aimed to the structure weight reduction by finite element analysis (FEA). The established wholly parametric and weight reduction model of wring structural part had been computed and meets the strength and stiffness requirement. The weight of this reel is reduced by 15.5 kg and lightweight effect is 8%. This method of weight reduction can be used to the reference on the design of hydraulic deck machinery of ship and hydraulic actuation construction machinery.
FEM-Based Lifting Permanent Magnetic Chuck Design
Authors: Ding Ning , Song Yu Mei , Wang Lina , Zhang Ding Tong , Ding Li Gong
Published: March 2013

The optimal saving energy permanent magnet lifting chuck has been designed. Working principle of this technology is introduced. Magnetic circuit design is carried out by finite element method (FEM). At the same time, a perfect self-acting driving system has been invented for picking and releasing loads fast and conveniently without using any electricity at all. Industry prototype was manufactured, and it verified that the proposed lifting permanent magnetic chuck was feasible.
Numerical Simulation of Single Metal Progressive Cavity Pump
Authors: Zhou Xian Jun , Feng Zhao Sheng
Published: March 2013

The motion law of single metal progressive cavity pump was studied through motion simulation. Then, the finite element analysis software ANSYS was used to analyze the distribution characteristics and the influencing factors of the contact pressure. It was pointed out that the single metal progressive cavity pump has the ability to withstand high temperature and the differential pressure mainly influences the wear. At last the reasonable range of the clearance was given.
Research on the Reliability and Optimum Design of Automotive Transmission
Authors: Wang Na , Chen Ming Fei , Zhang Lian Yong , Liu Ke Ming
Published: March 2013

Automotive transmission shaft is the main component of vehicle power; it directly affects the force conditions and the life of the stability of auto transmission. Therefore, mechanical analysis and optimum design of car's drive shaft is very important. Finite element analysis and reliability design of auto transmission are performed by Pro/MECHANICA software in the paper and the intermediate shaft on the vehicle drive shaft is analyzed and optimized.
Structural Optimization Design for Lower Beam of Hydraulic Press with the Casting Process Requirement
Authors: Zhao Wan Jun , Deng Zheng Hua , Teng Hua Ju
Published: March 2013

Through combining with VC++ and APDL language of ANSYS, the finite element optimization design for lower beam of the YJ32 hydraulic press was completed used complex method. The global optimum solution was obtained in the case of meeting the casting process requirement. The casting process requirement is that the thickness of a casting is almost the same and the inner wall thickness should be a little smaller than the outside wall thickness. The optimal result reduces the structure weight and the cost of the lower beam. Meanwhile, this provides a new method for the finite element optimization design about castings.
Stability Research on Configuration Transformation of the Complex-Surface Cutting Metamorphic Mechanism
Authors: Hu Sheng Hai , Liu Xiu Lian , Wang Hong Guang , Zhang Xiao Dong
Published: March 2013

The impact problem is analyzed when the complex-surface cutting metamorphic mechanism changes the configuration through ADAMS, assuring that the impact is decreased to minimum by changing the motion law of driving joint. The effectiveness of this method is verified through simulation, ensuring the stability of metamorphic mechanism in configuration transformation.
Numerical Prediction of Cavitation Erosion on a Francis Turbine Runner
Authors: Zhang Hong Ming , Zhang Li Xiang
Published: March 2013

The paper presents numerical prediction of cavitation erosion on a Francis turbine runner using CFD code. The SST turbulence model is employed in the Reynolds averaged Navier–Stokes equations in this study. A mixture assumption and a finite rate mass transfer model were introduced. The computing domain is discretized with a full three-dimensional mesh system of unstructured tetrahedral shapes. The finite volume method is used to solve the governing equations of the mixture model and the pressure-velocity coupling is handled via a Pressure Implicit with Splitting of Operators(PISO) procedure. Comparison the numerical prediction results with a real runner with cavitation damage, the region of higher volume fraction by simulation with the region of runner cavitation damage is consistent.
The Numerical Simulation of the Flow Field in the Underground Hydrocyclone
Authors: Wang Jing Chang , Guo Fu Lai , Wu Meng Hua
Published: March 2013

For preventing sand in underground oil, this paper structures a model of hydrocyclone with the inside cyclone and the outside one seriesing and describes how it works. By the TGrid procedures, the all of the hydrocyclone is meshed with the tetrahedral and the boundary conditions are determined. The methods of Three-dimensional numerical simulation in FLUENT are used to simulate the velocity field distribution, the pressure field distribution, the path lines of the separated medition characteristics of the separated medium and the phase distribution of the medium. The affect of the internal separated medition characteristics to the separated performance is analysed. Through the simulation, it is found that the spiral fin in the hydrocyclone can guide the fluid to produce a vortex flow to meet the purpose of separating the solid-liquid. There is no formation of the air column comparing with the conventional cyclone, so the internal flow field is more stable to conductive to the separation of the media. It provides a basis for the improvement of the cyclone.
Structural Dynamic Analysis and Optimization of High-Speed Precision Machining Center Column
Authors: Wang Fu Qiang , Rui Zhi Yuan , Zhao Dong Ping , Lei Chun Li
Published: March 2013

The theory of structural dynamic analysis is put forward firstly. Then the dynamic performance of HMC80 high-speed precision machining center column is analyzed by means of finite element method. The dynamic performance of the column is analyzed using structural dynamic optimization theory and variation analysis with the thickness of wall plate and the inner rib plates as the parameters thirdly. Based on the analysis results, the structure optimization scheme of the column is obtained. The structure optimization scheme is analyzed and the analysis results show that the dynamic performance of the column optimization scheme is improved obviously.
Optimization on Mistuning Blades Arrangement of Vibration Absorption Based on Genetic Particle Swarm Algorithm in Aero-Engine
Authors: Li Yan , Yuan Hui Qun , Yang Shang
Published: March 2013

In practical aero-engine bladed disk structure of blade mistuning is inevitable, and seriously affects the vibration characteristics of bladed disk system also on the whole aero-engine performance and life. Through the analysis, the blades arrangement order of a set of mistuned blade can greatly influence the vibration of bladed disk system, on this foundation; put forward a kind of new localization level of vibration parameters method for the characterization of mistuned system vibration localization degree. Furthermore, genetic particle swarm algorithm is used to optimize the blade arrangement sequence. The research shows that the selection of appropriate blade arrangement sequence can effectively reduce the bladed disk system forced vibration amplitude and the localization level of forced vibration.
Main Beam Optimization of Wind Turbine Blade Base on Multi-Objective Genetic Algorithm
Authors: Chen Guang Hua , Tian De , Deng Ying
Published: March 2013

Take s814 airfoil as an example, established the multi-objective optimization model of moment of inertia and the weight for wind turbine blade main beam,Using the genetic algorithm global optimization algorithm, and given the Pareto solution set of optimal with the form of Pareto front. Select four kinds of optimization results scheme to do finite element calculation. The results shows that the magnitude of moment of inertia accordance with the change trend of main beam deflection, the width and thick of beam cap have great affect on moment of inertia and weight, the nearer aerodynamic center of leading edge, the greater moment of inertia, the thick of web almost no influence on moment of inertia.
Experimental Study on Durability and NVH of Rear Driving Axle of Minibus
Authors: Li Hui Bin , A.M. Awais , Lu Qi Chen , Jin De Quan
Published: March 2013

Experiments on the durability for the rear driving axle were conducted in bench tests. By using time domain and frequency domain methods, the vibration and noise signals at bearings of driving axle were sampled and then analyzed. On the one hand, we find that the vibration level and noise level change with the wear of gears and bearings. On the other hand, with the development of the wear of gear and bearings, the frequency components of vibration and noise change with time. These experimental results will give help to further study of the durability and NVH characteristic of the rear driving axle.
High-Dimensional Harmonic Balance Analysis for a Turning Process with State-Dependent Delay
Authors: Kim Pilkee , Sun Wan , Seok Jong Won
Published: March 2013

The present study considers the state-dependent delay differential equations (SD-DDEs) for the turning process. In general, series expansion of the SD-DDEs turning system is essential in the nonlinear analysis such as the conventional methods of multiple scales and harmonic balance. Unfortunately, the mathematical theory of SD-DDEs, especially for those with an implicit function of delay, was just recently developed and any rigorous mathematical theory has not yet been proven. As one approach for the nonlinear analysis of the SD-DDEs, physically reasonable results could be obtained by extending the general theory of DDEs to the SD-DDEs through the use of the series expansion in conjunction with the implicit function, although there still remains an open issue of its mathematical rigorousness. The other approach may be treating the original SD-DDEs directly. To this end, the high-dimensional harmonic balance (HDHB) analysis is performed in this study in order to investigate the nonlinear behaviors of the turning system in the form of SD-DDEs without its series expansion. The results obtained by HDHB analysis are validated by comparing results with those of direct time integration. Using the resulting bifurcation diagrams, nonlinear chatter behaviors of the turning system are examined and discussed.
Reduction Design for Corrugated Box - Local Composite Strengthening Technology
Authors: Xu Jian Hua , Xiao Zhi Jian , Zhuang Adan
Published: March 2013

The reduction design is an important orientation for the design and development of corrugated box in the low-carbon economy era. Concentrating on 02 pattern corrugated box, and in accordance with the weight-bearing principle of cartons and intended strength requirements, this paper conducts the local strengthened composition on the corrugated box casing and enhances the physical properties of cartons in circulation, stacking, storage, and other aspects, which achieves the same physical strength as the traditional process but with less raw materials. The conclusions are drawn as follows on the basis of experimental and production cases: under the premise of selecting appropriate composite materials and processes, the use of the local composite strengthening technology in corrugated box casing can produce the carton with the same compressive strength while lowering more than 15% production costs than the conventional process. The study will provide some guidance to the reduction design of the corrugated box.
Study on Dynamic Characteristic of Internal Parallel Moving Gears Transmission with Balance Structure
Authors: Wen Fang , Cai Gan Wei , Wang Hu Qi , Li Yan Zhou
Published: March 2013

Considering the large structure and severe vibration for the present external parallel moving gear transmission, a kind of internal parallel moving gears transmission with compact and balance structure was designed. Working principle and structure were introduced. While the elastic deformation of all eccentric shafts, the elastic deformation of meshing gears, the elastic deformation of planetary bearing on eccentric shafts and supporting bearing on output shaft were considered, the elastic dynamic equation of the system was established by use of lumped mass method. The practical example and computer simulation was carried out and the dynamic characteristic was obtained. The results show that the gear meshing force and the load of planetary bearing become much steadier than traditional structure because of balance. This paper offers theoretical basis on correctly designing internal parallel moving gears transmission, reducing moving load and extending the service life.
Study on the Dynamic Characteristics of Automobile Tire
Authors: Zhang Peng , He Le , Liu Xu Tao , Xia Qun Sheng
Published: March 2013

Magic formula tire model under different conditions can be obtained by means of tire experimental data identification. The effects of speed and load on the tire cornering stiffness and peak friction coefficient under different conditions were analyzed. The results indicate that the variation of tire cornering stiffness and peak friction coefficient with the normal load at different speeds for both dry and wet conditions is a quadratic function. And the tire cornering stiffness decreases basically with the vehicle speed increasing on the wet roads due to hydroplaning effects. The peak friction coefficient decreases as the speed increases on wet roads, and it may not be less than one.
Simulation Research of Six-Bar Slider-Crank Mechanism
Authors: Wu Ying , Zhou Xu
Published: March 2013

For being convenient for researching the force transmission characteristic and the improvement and use of six-bar slider-crank mechanism, for improving the dynamic work efficiency, for reducing energy consumption, the three-dimensional solid model of the mechanism was established with ADAMS. Each part of the model in ADAMS was set up. Simulation analysis on the working process of the mechanism was achieved. The structure optimization parameters of the mechanism were obtained. The result proves that the locations of revolute joint of rocker and frame, the locations of revolute joint of link and block, the vertical location of revolute joint of upper link and rocker, the horizontal locations of revolute joint of upper link and link are almost no impact on the driving torque of crank. The locations of revolute joint of crank and upper link, the horizontal location of revolute joint of upper link and rocker, the vertical location of revolute joint of upper link and link have less impact on the driving torque of crank. The locations of revolute joint of crank and frame have greater impact on the maximum driving torque of crank.
Study on Avoiding Undercutting of Stub Tooth Involute Gear with 22.5 Degree Pressure Angle
Authors: He Jia Ning , Gao Yong , Zhang Hai Bin , Zhang Chao , Deng Xu Lei
Published: March 2013

Contrast analysis of the stub tooth involute gear with 22.5 degree pressure angle, and the existing gear with standard pressure angle has been given in this study. Based on the combination of generating method, numerical calculations and simulations, reasons of undercut phenomena for stub tooth involute gear with 22.5 degree pressure angle are researched and analyzed deeply. Minimum teeth without undercutting for considering the rack cutter’s addendum c*m is given based on the traditional undercutting theory, which also illustrated the validity of theoretical derivation.
Influence of Assembly Tolerance on Dynamic Characteristics of Motor Rotation Assembly
Authors: Lv Wei Wen , Jin Xu Xing
Published: March 2013

The motor rotation assembly of machine tools is mainly composed of spindle, rotor and bearings, it is to some extent the most important component, and its dynamic characteristics directly affect the machining accuracy and efficiency. Although the finite element method is effective to solve such dynamic problem, the conventional method generally ignores the influence of assembly tolerance between the spindle and the rotor .This probably would lead to a larger error result. A new method is described to evaluate the results obtained from finite element analysis .Firstly, a finite element mathematical model of motor rotation assembly is established, and then the model is tested by means of modal experiment, finally, the mathematical model results calculated by MATLAB software is compared with that of modal experiment, the results show that this modeling method is accurate and efficient. Furthermore, rotors of different inner diameters are mounted onto the spindle of same size, and then modal experiment and a finite element analysis are applied to obtain the dynamic characteristics of the motor rotation assembly under different assembly tolerances. This research can provide some reference values for the tolerance design of the motor rotation assembly.
Study on Water-Lubricated Graphite Sliding Bearing Performance Test
Authors: Yu Yang , Zhao Wei
Published: March 2013

Water-lubricated graphite bearing has gradually obtained the widespread application, with its high wear resistance, high temperature resistance and self lubricating, This paper designed the water-lubricated graphite sliding bearing performance testing platform and studied the factors that could affect bearing friction wear rate and the vibration of bearing, such as load, speed and running time. The final results show that the water-lubricated graphite sliding bearing can basically meet the requirements of the blower shaft system.
Design and Research on 1kgTNT Equivalent Explosion Vessel
Authors: Li Lin Na , Zhong Dong Wang , Zhang Chao
Published: March 2013

In order to the safe using of underwater explosion container and the efficiency, we must accurately determine the strength of the container. In the paper, researching on the design of 1kgTNT equivalent cylindrical explosion vessel it is indicate that strength calculation to explosion vessel using the dynamic coefficient method is accuracy. Experimental results also show that the security of the explosion vessel has reached the design requirements.
A Type of Wireless Sensor Network Platform
Authors: Wang Hong Wei , Ni Xiao Ming , Cheng Lei Ming , Zhang Chun Lei , Zhang Wen Kai , Wang Xiao Ni , Surong Qi Mu
Published: March 2013

The wireless sensor network (WSN) is the development trend of the technology of sensor. This paper, based on the nRF905 wireless module, introduces a wireless temperature gathering and transmitting system. From RF modules and master control module, the hardware platform has been designed, beyond that, the paper introduces the temperature sensor network software design. The test show that the system is stable, and data are reliable.
Simulating on a New Elastic Element of FBG Accelerometer
Authors: Shao Jun , Jia Zhen An , Liu Jun Hua
Published: March 2013

A new elastic element of fiber Bragg grating(FBG) accelerometer which is four peripheral clamped trapezoidal beams is developed. The simulation of this elastic element with ANSYS is carried out. From the results, it shows that as an elastic element, four beams have the advantages of lower cross-axis sensitivity which is smaller than 52 dB and nearly uniform strain along the grating area. In addition, its work frequency is higher than the single beam constituting four beams. This kind of elastic element not only can be used with fiber Bragg grating accelerometer, but also other types of sensors.
Implementation of Modified Conjugate Gradient Algorithm in Electromagnetic Tomography Lab System
Authors: Wang Zhan Jun , Li Liu
Published: March 2013

The advantage of the electromagnetic tomography is introduced briefly. Based on conjugate gradient algorithm, modified conjugate gradient algorithm for electromagnetic tomography (EMT) is proposed, which improves quality of reconstructed image and convergence speed efficiently. In the light of the lab electromagnetic tomography system, modified conjugate gradient for reconstructing images is verified. By evaluation of image error and the relevance, regularization, Landweber, conjugate gradient and modified conjugate gradient algorithms are compared. It can draw the conclusion that for different flow models, image error and the correlation using modified conjugate gradient algorithm is superior to the others in lab EMT system.
Special Display Instrument for Fiber Current Transformer
Authors: Di Zhigang , Jia Chun Rong , Wang Min Kun , Zhang Jing Xuan
Published: March 2013

To meet the requirement of fiber current transformer, special display instrument was deigned. SCM and advanced signal process technology were adopted in the instrument, so that the output voltage signal of low voltage terminal can be utilized by instrument to display measured busbar current value real-time. Besides, section linearization and distinguish calibration methods were adopted to improve measurement precision of display instrument. The experiment results indicated that this instrument has virtues of reliability, high precision and low cost, importantly, it can come up to the 0.2 standard. So we can draw a conclusion that this instrument can meet the industrial requirement for display instrument.
Study on Comparison Analysis and Error Analysis of Polarization Ratio Models
Authors: Wang Ke , Zhang Yuan , Hui Yan Bo , Wang Feng , Li Hong Yan , Yang Jing , Hu Ji Wei
Published: March 2013

Polarization ratio models are key problem for ocean surface wind field retrieval from HH polarization SAR images. This paper studied deeply on various polarization ratio models, and carried on comparison analysis and error analysis about them. We analyzed influence of incidence angle, azimuth, and wind speed for polarization ratio. By using true measurement of polarization ratio, we statistically valuated ability of various polarization ratio models, and proposed the best choice of polarization ratio models. Our research has guide meaning for using polarization ratio models reasonably.
Development of Monitoring and Diagnosis System for Linear Motion Unit
Authors: Jian Huang , Kim Hwa Young , Ahn Jung Hwan
Published: March 2013

In the present work, investigations by high frequency resonance technique for diagnosis of defect frequencies of linear motion unit are reported. Raw vibration signature of the moving parts at different speeds of operation has been demodulated. Envelope detected spectrum is analyzed to evaluate various defect frequencies and their energy levels. Experimentally evaluated frequencies are compared with theoretically determined defect frequencies. These frequency values and their energy levels are used to monitor intrinsic condition of linear motion unit as well as to establish severity of existing/developed defects on the LM guide and inside the LM block. Relative comparisons of linear motion units of the same type are made at various operating speeds under identical conditions of operation on the basis of identified defect frequencies and severity of defects.
The Modular Design of the Hydraulic CAT System
Authors: Yao Kai , Xing Ke Li , Jin Jian
Published: March 2013

The use of PLC, A/D module, D/A module and the communication module achieves the hardware modularization. The development and the encapsulation of various function modules in LabVIEW achieve the software modularization. The modular design of the hydraulic CAT system shortens the development cycle and improves the expansibility and the universality.
Elastic Wave Measurement Technology and its Engineering Application
Authors: Li Jin Kui , Zhang Lei , Yang Wen Hua , Sun Ming Liang
Published: March 2013

The velocity and amplitude of elastic wave in the rock mass are dependent on the physical and mechanical properties, as well as the structural and stress state of rock mass. The elastic wave testing technique has become one of the most important approaches in geological engineering and rock mechanics. In order to enhance the analysis and application of elastic wave testing technique, the present paper investigates the elastic wave propagation pattern both in laboratory and in field. The lab tests focus on wave velocity in rock mass and the field work focus on the measurement of longitudinal wave velocity by using double-service elastic wave test. The field tests also include the testing of the roadway surrounding rock loose circle on the edge of underground chamber construction site. The study profiles the rock mass’s elastic wave dynamic characteristics, clarifies the rock mass structures, assess the property of the rock mass surrounding the subway. All these are of great significance to the underground chamber and tunneling engineering design and construction.
Analyzing the Natural Frequency of Litchi Tree
Authors: Liu Tian Hu
Published: March 2013

The aim of the investigation is to analyze the natural frequency of litchi tree. The litchi tree was simplified into a cantilever beam with a concentrated mass attached at the free end. Equivalent mass equation and stiffness equation were established to calculate the natural frequency. Effect of canopy mass, trunk length, bottom radius of trunk, and top radius of trunk to the natural frequency of litchi tree was analyzed. The analysis results showed that natural frequency decreases with canopy mass and trunk length, and increases with bottom radius and top radius of the trunk. And in a conventional trunk radius, length, and canopy mass range, the natural frequency in cycles of the litchi tree is between 0.5-5Hz.
Air Dustfall Impact on Spectrum of Ficus Microcarpa’s Leaf
Authors: Xu Jin Hong , Yu Jin Ting
Published: March 2013

This article has studied the correlation relationship between the spectral features of polluted leaf surface of Ficus microcarpa and air dustfall in Guangzhou City. The results show that the spectral reflectance of leaves in the industrial area and large traffic area is 3-5.5% higher than that of leaves in cleaning area in the visible band, but is 10-15% lower in the near infrared band. Compared to the spectral reflectance of the cleaned leaf, the spectral reflectance of leaf on nature dirty is 6.6％ higher in the visible band and 25.6% lower in the infrared band. The spectral reflectance difference between dirty leaf and cleaned leaf in the infrared band has a strong correlation with air dustfall in Guangzhou city. The correlation coefficient is 0.821. It is simple and convenient, fast, economic method to monitor the air dustfall using the spectral characteristic of Ficus microcarpa’s leaf.
The Application of Ant Colony Optimization in Wireless Sensor Network Routing
Authors: Yao Ya Chuan , Yao Yi
Published: March 2013

The paper proposes wireless sensor clustering routing protocol based on ant colony algorithm(ACO). The method firstly uses the network self-topology to get a stable cluster structure based on modularity clustering algorithm; secondly make a new cluster-head selection function according to each cluster node residual energy and the distribution of cluster node; then we propose inter-cluster multi-hop routing algorithm based on ant colony optimization, which in order to balance the energy between consumption on the transmission path and residual one of cluster-head node, developing new ant transmission probability and pheromone updating strategy, we verify the validity of algorithm through simulation.
Evaluating Method of Roundness Error Based on the Maximum Inscribed Circle and Minimum Circumscribed Circle
Authors: Lei Xian Qing , Ding Feng Qin
Published: March 2013

Based on the geometric characteristics of maximum inscribed circle (MIC) and Minimum circumscribed circle (MCC), a novel method for roundness error evaluation using Geometric Approximation Searching Algorithm (GASA) has been presented in this paper. First, a square is allocated by taking the predetermined reference point as initial reference point, and the radius value of all the measured points are calculated by regarding each vertex of the square and the initial reference point as the ideal centres respectively. Second, the minimum and maximum radius are obtained when each vertex of the square and the initial reference point as the ideal centre point. Final, compare these radius and arrange the square repeatedly. Repeat the steps, the roundness error of the maximum inscribed circle can be obtained complies with ANSI and ISO standards. The experimental results show that this algorithm is effective and accurate.
Research on Length Measurement of Workpiece Based on Digital Image Processing Technique
Authors: Luo Bin , Liu Wei , Luo Yun
Published: March 2013

Aiming at the problems such as slow speed and low measuring accuracy existing in measuring length precision of pin parts in mass production, a new approach of high speed and precise measurement is proposed based on the research of the length measuring methods such as parallel laser length measuring method and area array CCD measuring method, etc. Application of (machine vision system and computer measurement & control technology) digital image processing technology can perform automatic high speed measurement and separation of workpiece effectively and accurately. The experimental results show that the machine speed could reach 4-5 pieces/second, with length measuring accuracy of around 10 microns, indicating that the approach proposed in this paper has important practical value.
Modified Short Baseline Acoustic Relative Localization System
Authors: Lin Cong Ren , Huang Sheng De , Yuan Fei
Published: March 2013

Underwater localization is a key element in most underwater communication applications. Since GPS signals highly attenuate in water, precise ranging based techniques for localization need to be developed. In this paper we describe a modified Short Baseline (SBL) acoustic localization system, in which a scheme of multi-channel data acquisition based on LabVIEW, the Generalized Cross Correlation (GCC) algorithm, and the hyperbolic positioning algorithm are used. Simulation results show that the modified SBL acoustic localization system that we proposed can adapt to the underwater harsh environment better, and also can reduce the position statistical error of underwater target significantly.
A New Soot Emission Model for Diesel Methanol Dual Fuel Engine
Authors: Wang Hong Fu , Xiong Jun Hua
Published: March 2013

The modified Hiroyasu soot model is widely used to describe the soot emission from diesel engine, but diesel methanol dual fuel engine is different from diesel one. In order to obtain quantitative comparisons with experiments, a new soot emission model was presented, which was formulated to incorporate the effects of both chemical kinetics and turbulent mixing. The model was applied to simulate soot emission from diesel methanol dual fuel engine. The calculating results indicate that the predicted soot emission from the new model agrees well with the measured data.
Image Recognition Based on Chaotic-Particle Swarm-Optimization-Neural Network Algorithm
Authors: Li Bo , Shi Song Xin , Wang Shi
Published: March 2013

A novel image recognition method based on chaotic-particle swarm-optimization-neural network algorithm was presented. The chaotic mapping mechanism and particle swarm algorithm were used to optimize the weight and threshold of BP neural network which was applied to the recognition of image. The simulation results show this new method can overcome the problems that BP neural network is easy to fall into local optimum and sensitive to the initial value, and has better recognition rate and stronger robustness.
Denoising Power Quality Signal Using Savitzky-Golay Based on Virtual Instrument
Authors: Yang Han Sheng
Published: March 2013

In power quality monitoring system, there are unavoidably existing various kinds of noises in collected data，the presence of noise may result in increased false classification rate, denoising is an extremely important work for detection and classification of power quality disturbances. In order to improve the denoising result of power quality signal, an denoising method for power quality signal using Savitzky-Golay is proposed. Numerical results show that the proposed method can eliminate the influence of noise components and implement transient power quality disturbance detection and localization, thus providing good foundations for transient power quality disturbance monitoring under noise environment.
Researches on Channel Mismatch Effects in Time-Interleaved ADC System
Authors: Sun Hui Yong , Cao Peng
Published: March 2013

The Time-Interleaved ADC（TIADC) is an effective method for implement ultra high-speed data acquisition. However, the errors of channel mismatch are seriously degrade the signal-to-noise ratio of the system, such as Time-skew error, Gain error and Offset error. This paper have done some researches and analysis, and given the modeling of the three channels mismatch. What's more, it also given a detailed analysis of error and the method of measure it, derived the formula of signal to noise and distortion ratio(SINAD) and spurious free dynamic range(SFDR). All of them provide a reference for the tolerance range of TIADC channel mismatch error. Meanwhile, the result of this paper has provided a theoretical basis for eliminating TIADC channel mismatch error.
The Study of Smoothness and Similarity for Denoising Signal Based on Wavelet Transform
Authors: Zheng Si Li , Gui Yu Feng , Chen Xian Qiao
Published: March 2013

Focus on the problem of de-noising signals smoothness and similarity.The three signals were processed by four signal de-noising methods,which are inhibition detail coefficients,Fourier transform,global threshold and layered threshold method.And the energy ratio(PERF) and standard deviation(ERR) were obtained.Experiment results show that the global threshold de-noising method is the best for its high similarity;the layered threshold de-noising method is the best for its high smoothness.
A Novel Method to Segment Keyboard Characters and Symbols Using Morphology
Authors: Gao Xin Wen , Guan Xing Jian
Published: March 2013

This paper proposed a novel method to segment the keyboard characters and symbols. An algorithm based on mathematical morphology has been applied to the keyboard inspection system. By using various morphology operations like opening and dilation, the algorithm overcomes the disadvantages of the traditional method such as time-consuming and unreliable. Therefore, our approach is capable of segmenting the characters and symbols accurately and we at last get the region of interest (ROI) to represent the keyboard characters and symbols.