bluuebunny/crossref_metadata_2025 huggingface dataset:
Lifting Platform Hinge Shaft Contact Finite Element Analysis
Authors: Sun Yi , Liu Yuan Cai , Xia Bing Hua
Published: February 2014

The lifting platform connecting hinge shaft finite element analysis by ANSYS software, and the fork arm is connected to the hinge bearing contact surface using spring element, the spring element contact stress situation to determine the hinge bearing and internal and external fork arm, solves the contact with the fork arm of the hinge shaft stress relationship problems, finite element analysis. The model is more accurate. The analysis of ideas can be widely applied to the similar finite element contact analysis.
Finite Element Analysis of Material Mechanics Experiment
Authors: Sun Yi , Liu Yuan Ca , Yao Shun Zhong
Published: February 2014

The finite element analysis is used for general experimental mechanics of materials. By analyzing numerical value of finite element in ANSYS software platforms, the corresponding stress, strain data and deformation diagram will be obtained. This lays a foundation for academic research of experiment. This paper compares the conventional electric method with finite element analysis by the normal-stress distribution of pure bending beams experiment. The comparing shows that the experimental results of the two methods are uniformity. In this paper, the study provides an effective way to experimental mechanics of innovative research.
Study of a Four Rotor Aircraft Modeling
Authors: Xian Yang Jin , Peng Li Zhi , Chao Chen
Published: February 2014

In order to design the four rotor aircraft attitude control system, take the hover state or low speed flight state as a benchmark, firstly, divide the aircraft model into linear motion model and the angular motion model and model it separately, the nonlinear mathematical model of aircraft can be obtained. And then use the small disturbance linearization principle to linear mathematical model for a simplified model. After substituting into the previous experimental data, the mathematical model which controller design needs is got.
Analysis of Air-Flow Field of Large Ships in Waves
Authors: Li Xiang , Huang Sheng , Ding Song , Gu Lang
Published: February 2014

Movement of large ship in waves is one of the important factors which can induce ship surface air turbulence; it is bound to a large impact on the air-flow field on deck, which affect the safety of the aircraft landing. In order to study the change of the flow field in the process of movement of large ship and its influence on aircrafts take-off and landing, under the same experimental condition of the unsteady condition. We set up 3d model, observe and analyze the ships air-flow field changes in the movement. Finally, calculate the results and give the effect of the aircraft landing in the key areas.
Research of Shell PTDF Shrink Model
Authors: Li Hong Jun , Wang Dong Feng , Yan Long , Tang Xing , Xiao Zhi Quan
Published: February 2014

Stress (P) and pressure time (T) are the two main factors which affect the bayonet tube shell shrinking size. In this paper, we study this two factors. Double factors regression analysis and variance analysis method were used to analysis data. PT tube shell shrinkage model is set up to explore the correlation of tube shell shrinkage size and pressure (P) and the pressure time (T) and its change rule. Results show that the established PT contraction model can well reflect the relationship between the tube shell shrinkage size and the PT factors.
Deformation Analysis of Stator of Opposed Biconinal Cone Screw Seawater Hydraulic Pump
Authors: Tu Cheng Yuan , Gong Zhi Ben , Wang Xin Hua , Gao Yan , Cai Jiao Yan
Published: February 2014

Metal cone of the screw rotor and stator rubber bushings are the two main components of the opposed biconinal cone screw hydraulic pump for the seawater. The stator rubber bushing is not only a damageable element, but also the key component deciding the service life and efficiency of the pump. Up to date, none effective method has been found for testing the deformation and enforced state of the stators rubber under the real working condition. For the general conventional screw stator with uniform internal pressure at both ends of the stator bushing enforced and deformed almost the same, as to other case when the cone screw pump stator has rubbers with different cross-sectional size and thickness at its different end, the enforcing and deforming state at different end varies differently. The stator of the opposed biconinal cone screw hydraulic pump is studied in this paper for the case when the stator is uniformly enforced, using finite element analyzing software ANSYS-Workbench , this study concluded the stress, the strain and inner-figure deformation of the screw hydraulic pump stator, the stator rubber and the stator steel thimble. Besides, the characteristics and rules of opposed biconinal cone screw hydraulic pump deformation are summarized as well.
The Effect of Droplet Impingement on Pressure and Heat Flux Distributions on Molten Pool in GMAW-Based Rapid Forming
Authors: Yin Feng Liang , Zhu Sheng , Liu Jian , Wang Xiao Ming , Guo Lei
Published: February 2014

A low dimensional precision is one of drawback for the GMAW-based rapid forming technique, which is related to pressure and heat flux on molten pool. To study pressure and heat flux on molten pool, the effect of droplet impinging process must been considered. A three-dimensional numerical model was built to analysis pressure and heat flux distribution on molten pool. Solving the model, it was found that pressure on the cathode by the arc decreases dramatically when the droplet is coming. As to heat flux, the appearance of droplet cuts down it within about 1.5 mm away from arc axial. Out of 1.5 mm away from arc axial, droplets effect on heat flux is not obvious.
Topology Optimization of the Base of Loading Device
Authors: Mei Hua Ping , Tian Hao Yue
Published: February 2014

The base of Parallel loading device withstand the pressure of hundreds of tons, Limited by the conditions of use, All components of the device must be manual handling, so Its weight becomes very sensitive. The initial design weight of base are about 170 kg, By handling environmental constraints, four men lift is also very convenient, Therefore it's urgent to reduce weight. In this paper, a powerful modeling capabilities of UG combined ANSYS topology optimization module on the base for a topology optimization, We refer to the shape of topology optimization design of the final design of the structure. Through finite element analysis, the structural stiffness and strength to meet the design requirements, And weight decreased from about 170 kg to 120 kg, reduced by nearly 30%.
The Optimized Analysis of Ladder Structure of the Aerial Ladder Truck
Authors: Shi Zong Ying , Huang Qi Bai , Li Shan De
Published: February 2014

Using software UG to create the ladder structure model of the aerial ladder truck, by importing the model to finite element software ANSYS Workbench, analyze and calculate the Max stress and Max displacement of its risk condition. Satisfied the requirements of safety, optimize ladder structure and then analyze it. The result shows that the optimized ladder structure has smaller stress and smaller displacement, the mechanical properties are better.
Comfort Evaluation Research on Clutch Operation of Light Commercial Vehicle
Authors: Yang Xiao Qing , Lu Qi , Yao Jian Hui
Published: February 2014

Based on biomechanic theory, the comfort evaluation can be made to aim at improving the comfort of clutch operation of light commercial vehicle. First, the virtual model of the cab was established to predict posture of pressing clutch pedal. Then values of joint toques were figured out by using Jacobin Method and these data were brought into the comfort evaluation function to achieve the comfort degree of clutch operation. From the perspective of biomechanics, this research reveals the cause of clutch operation discomfort in a deeper sense and will provide a new reference approach for improving operation comfort of light commercial vehicle.
Study on Compacting Mechanism of Plate Cross Wedge Rolling High-Speed Rail Screw Spike
Authors: Jiao Si Jia , Shu Xue Dao , Qi Yong , Hu Bin
Published: February 2014

A thermal mechanical coupled model for High-Speed rail screw spike had been established with the aid of FE software Deform-3D by using rig id-plastic FEM. According to the results of finite element simulation, the metal flowing rules in plastic deforming were discussed. Stress and strain field distribution of Screw Spike were concrete researched. It has important theoretical sense and using values on solving part precision forming and workpiece quality improvement of plat cross wedge rolling.
Recent Study on the Passive and Active Vibration Isolators
Authors: Mei Hua Ping , Tian Hao Yue , Huang Shuan
Published: February 2014

The vibration isolators have witnessed significant developments due to pressing demands for high resolution metrology and manufacturing, optical, physical and chemical experiments. In the view of these requirements, the engineers and physicists have exploited different types of vibration isolators. This paper firstly presents the recent developments on the passive vibration isolators. It finds that the passive vibration isolators can constrain the high frequency oscillation. The active control is the efficient method to cancel the low frequency vibration. Then, the paper is concerned with the recent advances on the active vibration isolator. The appropriate actuator, sensor and advanced control method are the key component of the active vibration isolator to enhance their vibration isolation properties. Finally, the author proposes that the magnetic suspension vibration isolator is a future research direction in the field of the vibration isolation.
The Component Utilization Analysis of Mechanical System with Adaptable Functions
Authors: Yu Y.W. , Deng Y.M.
Published: February 2014

s. The purpose of this paper is to propose one of methods to measure utilization of component about mechanical system with adaptable functions. The method is based on the incidence matrix between functions and components of those mechanical systems. And cost of components is considered in this method for further expressing comprehensive utilization. Finally a case of adaptable-function pliers is studied to illustrate the feasibility of the method.
Experimentation and Design of Prototype Device for Three Point Incremental Forming
Authors: Wang Qiu Cheng , Hu Hai Han
Published: February 2014

Based on the principle of Single Point Incremental Forming (SPIF) and Double Side Incremental Forming (DSIF), A new Three Point Incremental Forming (TPIF) prototype device was developed to improve the forming accuracy. The mechanical structural components and the control system were designed and the TPIF prototype device was assembled. A TPIF trial example proved that this TPIF device can realize more forming accuracy than SPIF and DSIF. This TPIF prototype device provides a good platform for further study of the three point incremental forming.
Deformation Analysis of Hydrostatic Thrust Bearing under Different Load
Authors: Zhang Yan Qin , Fan Li Guo , Chen Yao , Li Rui , Wu Tian Zheng , Yu Xiao Dong
Published: February 2014

In order to solve deformation problem of large size hydrostatic thrust bearing under different load. Simulation model of fan cavity hydrostatic thrust bearing, three-dimensional mathematical model in guide rail is set up. Using CFD principle, FIUENT and ANSYS Workbench software, temperature field, pressure field and deformation field of hydrostatic bearing is simulated. Hydrostatic bearing deformation under different load conditions can be simulated and the lubrication characteristic is forecast in advance through this method. It provides valuable theoretical basis for hydrostatic bearing structure parameter optimization of oil cavity and worktable.
An Experiment-Based Investigation on Characteristic and Model of Milling Forces during End-Milling Aluminum Alloy
Authors: An Zeng Hui , Fu Xiu Li , Pan Ya Nan , Tang Ai Jun
Published: February 2014

Cutting forces is one of the important physical phenomena in metal cutting process. It directly affects the surface quality of machining, tool life and cutting stability. The orthogonal experiments of cutting forces and influence factors with indexable and solid end mill were accomplished and the predictive model of milling force was established during high speed end milling 7050-T7451 aluminum alloy. The paper makes research mainly on the influence which the cutting speed, cutting depth and feed have on the cutting force. The experimental results of single factor showed that the cutting forces increase earlier and drop later with the increase of cutting speed, and the cutting speed of inflexion for 7050-T7451 is 1100m/min. As axial cutting depth, radial cutting depth and feed rate increase, the cutting force grows in different degree. The cutting force is particularly sensitive to axial cutting depth and slightly to the radial cutting depth.
Chatter Nonlinear Analysis Based on Virtual Instrument Platform
Authors: Wu S. , Xu H. , Xie Y.B. , Liu C. , Bian L.J.
Published: February 2014

In order to analyze the nonlinear dynamics of milling chatter, first we develop a cutting vibration signal acquisition and analysis system based on Labview platform; extract the phase and the maximum Lyapunov exponent of cutting vibration signal. We analyze characteristic value of vibration signals under different cutting conditions, and then online forecast milling chatter.
Key Technology of the Denture CAD/CAM System
Authors: Ge Xiu Guang , Jiang Xue Ling , Chen Li Hui , Liao Jian Hong
Published: February 2014

The key technologies of denture CAD/CAM system were studied in this study. Key technologies include: model acquisition, data processing, surface reconstruction, creating CAD models, establish standards tooth databases, rapid prototyping and CNC machining. The results show that the actual dentures feasibility of CNC processing systems and the denture model is validated. This study lays solid foundation for the development of the low-cost, lightweight and fast denture CAD/CAM system.
Effect of Creep on Stress and Strain at the Tip of Stress Corrosion Cracking in High Temperature Water Environments
Authors: Xue He , Tian Jin , Yang Fu Qiang
Published: February 2014

Stress and strain at the crack tip are main mechanical parameters which estimate the stress corrosion cracking rate in metals, and the creep of metals in high temperature and high pressure environment will lead to the redistribution of stress and strain nearby the crack tip. The effects of creep on stress and strain nearby the crack tip are discussed by using 1T-CT specimen and finite element method in this study. The investigated results indicate that both increasing of temperature and stress intensity factor would induce the equivalent creep strain increases at the crack tip.
Research on the Affection of Vehicle Lateral Stability Related to the Improved ABS
Authors: Xu Yan , Luo Tao , Wang Qian
Published: February 2014

When automobile is braking in a turn, the left and right wheel load changes, often leads to excessive loss of vehicle steering stability. The process of steering is often accompanied with braking, we can improve the control strategy of anti-lock braking system which widely used in vehicles to maintain the steering-braking lateral stability.
Dynamic Modeling and Analysis of Active Magnetic Bearings
Authors: Gao Rong , Luo Gang , Yan Cong Xun
Published: February 2014

Active magnetic bearing (AMB) system is a complex integrated system including mechanics, electronic and magnetism. In order to research for the basic dynamic characteristic of rotor supported by AMB, it is necessary to present mathematics method. The dynamics formula of AMB is established using theory means of dynamics of rotator and mechanics of vibrations. At the same tine, the running stability of rotor is analyzed and the example is presented in detail.
The Efficiency Optimization of the Cylindrical Grinding Based on Acoustic Emission Signals
Authors: Song Qi
Published: February 2014

To improve the efficiency of cylindrical plunge grinding, an optimization of grinding process is developed using the Acoustic emission (AE) signals. The relationship between the grinding feed and grinding depth is established based on the elastic deflection between wheel and workpiece. Acoustic emission (AE) signals are curve fitted through the gauss - Newton method to find the stable point of various grinding processes. Therefore, grinding time of each grinding stage is reduced to improve the grinding efficiency.
The Quantification Research of Engine Body Defect that Tested by Ultrasonic Phased Array
Authors: Ma Ding Bang
Published: February 2014

After a long run, the places of body cooperate with valve very easy to produce fatigue cracks. This cracks if not detected, extremely easy to have the accident. As the most commonly used testing equipment, ultrasonic nondestructive testing is often used to detect the engine body. However, most of the existing ultrasonic nondestructive testing equipment is used to detect whether there is a defect, there is little research the specific size of defects. According to the principle of ultrasonic emission, theoretical calculation and combined with test block, get the body phased array detection method.
Study on Synchronous Transmission of High Speed Packaging System Based on AC Servo Motor
Authors: Liu Juan , Wang Hong Liang , Cao Min , Chen Xian Fu , Zhang Shao Quan
Published: February 2014

The mechanical transmission of the traditional packaging machine is complex and slow. Single packing species, long development cycle, which cant adapt the growing of diversification and personalized needs of packing. In this paper, three servo pillow packing machine, for example explores the high-speed synchronous transmission process of packaging systems. Studying the servo pillow packing machine in this article is a kind of packing equipment, which can automatically complete feeding, deliver the membrane, makes the bag, pulls the membrane hauling, vertical seals, seals the transverse cutting horizontally, end product output and other processes, adapting for the general block packaging material, tube shape regular goods, irregular shaped goods, for example: biscuits cakes, cosmetics, paper towels and so on. Packing speed is fast and the movement precision is high.
The Design on Installation and Demolition Device for Lamps and Lanterns
Authors: Wang Kai Bao , Yang Qiu Xiao , Wang Bo , Zhu Bo , Zhang Qun , Yue Chao
Published: February 2014

A wide variety of lighting lamps and lanterns were used in various occasions in our daily life. Considering the service life, the lamps and lanterns were changeed usually. It is extremely complicated to replace the lamps and lanterns installed in high or concealed position. The installation and demolition device for lamps and lanterns based on optimization design method and dynamics analysis is introduced in the paper. The device can be used in the place of ordinary families, residential areas and fitted for different specifications of the lamps and lanterns. The work efficiency was improved greatly through the mechanisms arranged in circular. In the research, the virtual prototype technology was used to simulate the kinematics and dynamics characteristics of the mechanical system. The feasibility of the design scheme of mechanical system was proved with the simulation analysis results. The equipment has advantages of the structure is compact, safe and reliable, easy to use. The research of the installation and demolition device for lamps and lanterns can be regarded as the reference of the related research.
The Design of Carbon Dioxide Detection Instrument Based on MSP430F435
Authors: Zhao Hong Wei , Gao Heng Fei , Yuan Shuo , Long Man Li
Published: February 2014

Studied herein, carbon dioxide detector is based MSP430F435 microcontroller developed and designed. The instrument has two upper machine and lower machine part, the host computer by PC-based operating system and application software, has a good human-computer interaction systems, a friendly man-machine interface. Aspects through the host computer machine operator is able to control the next bit machine. Lower machine selection of the MSP430F435 microcontroller as lower core chip, the chip can efficiently execute code.
The Research on Leak Detection Technology of Natural Gas Pipeline Based on EMD
Authors: Li Chuan Jiang , Zhang Jia Pan , Zhang Zi Qiang , Hu Ju Li , Li Yi
Published: February 2014

The acoustic emission signal of pipeline leakage is characterized by nonlinear and non-stationary. It is not feasible to extract the leakage feature signal in traditional signal processing methods. The leak locations can be detected by employing the improved empirical mode decomposition (EMD) to decompose the acoustic emission signal into several intrinsic mode functions (IMF), choosing IMFs containing leakage characteristics to be reconstructed, and doing correlation analysis. Experimental results show that the positioning accuracy of leakage detection is improved obviously.
Fault Detection for Roller Bearing with Vibration Analysis and Information Fusion in Sorting Machine Induction
Authors: Chen Wei , Jia Qing Xuan , Sun Han Xu , Nian Si Cheng
Published: February 2014

Due to continuous metal-metal contacts in heavy and high-speed operating conditions, sorting machine inductions roller bearing easily occurs malfunctions. Therefore, its crucial to make incipient fault diagnosis. This paper presents a novel diagnosis algorithm using vibration analysis and information fusion. In the algorithm, vibration signal for roller bearing is firstly analyzed. Then extracted fault features are used as input eigenvector of constructed neural network classifier. In order to improve diagnosis accuracy, take output information of each single classifier as independent evidence, and aggregate them using improved Dempsters combination rule. Experiment results show that proposed algorithm has high accuracy of 99.5%.
An Extracting Algorithm of Ultrasonic Doppler Shift for Multiphase Fluid Flow Measurement
Authors: Cao Xin Liang , Cui Wei , Wang Meng De
Published: February 2014

Because of the complexity for the frequency measurement about echo signal of ultrasonic Doppler flow, the acquisition methods directly affect the accuracy of Doppler frequency shift. The algorithm of power spectrum extraction has accurate to detection echo Doppler frequency of stationary signal for the flow-velocity measurement. The key is to obtain relative useful frequency information from complex echo velocity. This study is based on the principle of Doppler velocity measurement, by studying the average frequency algorithm of echoes, and the Fourier transform method is adopted to identify Doppler signal frequency and Doppler frequency shift which was polluted by aliasing noise. The MATLAB simulation results show: the useful frequency to obtain reliable, accurate, and also laid the foundation for the measurement of multiphase flow non-stationary signals.
Soft Measurement Technology for Tractor-Semi Trailer
Authors: Wei Chao Yi , Li Xu Guang , Xie Mei Zhi , Yi Feng Yan
Published: February 2014

A three degree of freedom vehicle dynamic model of a tractor semi trailer is established and a simulation mode is set up with the Matlab/simulink software. Then, design a Kalman state estimator, using easily measured parameters to estimate the tractor side slip angle, trailer yaw rate those are difficult measured or measuring in high cost; the simulation show that: the estimated value coming from estimator agree well with the simulation measurements, and can improve the estimation accuracy by adjusting the process noise covariance matrix and measurement noise covariance matrix.
A Novel OFDM Radar Algorithm in Vehicular Environment
Authors: Yu Xiao You , Zhao Peng
Published: February 2014

A novel OFDM radar processing algorithm using pilot signal is proposed in this paper. Based on the prior knowledge of the pilot signal in OFDM symbol in communication system, the receiver can estimate the transmitter's range, velocity by the processing of the received modulation domain signal. In addition, we test the approach by the OFDM frame signal of the famous IEEE Std 802.11p, the results show it can work robustly and is very suitable for the vehicular application.
Condition Monitoring and Fault Diagnosis of Mechanical Equipment under Flexible Manufacturing Environment
Authors: Yin Bao Ming
Published: February 2014

By analyzing the design process configuration design for order in much discipline, high coupling, many iterations, and the basic characteristics such as systemic, based on the characteristics of table things ETO enterprise operation critical process research method. The study in the process of enterprise operation several key technology, puts forward the design process and process data of integrated model; Analysis of process management and process quotation system integration method. Through the and process management of integration, to design and the changing design as the main means, to realize the rapid design ETO process. Finally, taking the electric power company risk management system for an example to verify the feasibility of the theory.
Kinetic Analysis of the Unbalanced Masses of Wheel Based on ADAMS
Authors: Li Xiao Yong
Published: February 2014

The unbalanced masses of wheel have an important effect on the performance of the car. There we use the ADAMS software to establish the kinetic model of a wheel about the 1/4 suspension, and do the vibration analysis of unbalanced masses to a single wheel by the modular of ADAMS/Vibration.
Theoretical Research on a New Type Tube-in-Tube Evaporative Condenser
Authors: Ma Rui Hua
Published: February 2014

A new type condensertube-in-tube evaporative condenser is proposed, it is added a inner tube in the heat exchange tube on the basis of the evaporative condenser, it results the refrigerant can exchange heat in the inner tube, the heat transfer coefficient rises, and the heat transfer ability is improved. The structural style and the working principle of the condenser are introduced, the tube-in-tube evaporative condenser and the evaporative condenser are numerical calculated in the same condition, the result proves the tube-in-tube evaporative condenser has more ability on heat transfer.
Numerical Simulation for Perforation-Caused Leakage Diffusion of Buried Gas Pipeline
Authors: Cui Jing , Ma Si Yue , Liang Yu Peng , Guo Yong Hui , Zhao Xue Bin , Shi Li Xue
Published: February 2014

This paper focuses on the perforation-caused leakage diffusion of the underground gas pipeline. Common situations, such as normal leakage model, perforation leakage model and pipe model, are analyzed by theoretical method, and so does the leakage model of natural gas in atmosphere, such as Gauss model. Subsequently, the actual perforation leakage diffusion problem is simplified into an ideal model based on the characteristics of buried gas pipeline. CFD software FLUENT is adopted to perform a transient simulation of this problem, by which the changing trend of the diffusion concentration and velocity of methane with time is obtained and the influence from perforation diameter is further investigated. The results obtained in this paper provide some scientific basis to the safety management and accident rapid rescue of underground gas pipeline.
Study of Map-Reduce over Hadoop Based Cloud Computing Environment
Authors: Pan Wu Min , Ha Li Bai
Published: February 2014

Popularity for the term Cloud-Computing has been increasing in recent years. In addition to the SQL technique, Map-Reduce, a programming model that realizes implementing large-scale data processing, has been a hot topic that is widely discussed through many studies. Many real-world tasks such as data processing for search engines can be parallel-implemented through a simple interface with two functions called Map and Reduce. We focus on comparing the performance of the Hadoop implementation of Map-Reduce with SQL Server through simulations. Hadoop can complete the same query faster than SQL Server. On the other hand, some concerned factors are also tested to see whether they would affect the performance for Hadoop or not. In fact more machines included for data processing can make Hadoop achieve a better performance, especially for a large-scale data set.
Vortex Stability Analysis Based on Coupling the Rubbing with BTA Boring Bar
Authors: Zhao Wu , Chen De Jie , Hu Zhan Qi
Published: February 2014

For the purpose to analyze the stability of the deep-hole boring, a rubbing disturbance model is proposed. New model introduces an effect of friction dominant. The stability criterion of the system is obtained, by means of describing the tangential friction velocity as the function of the angular frequency and eccentricity. Thus, the center tracks changing with vortex stirred by the rotating bar within the inner and outer cutting fluid environment are analyzed. The results show that the vortex frequency of boring bar tends to increase with rotation speed increasing. The vortex frequency tends to hyperbolic declining with the increasing of the clearance C.
Design and Manufacture of a Forehand Attack Exercising Device for Teaching and Training of Table Tennis
Authors: Zhang Xing Hai
Published: February 2014

Exercising devices are playing important role in assisting the modern teaching and training of table tennis, but so far few exercising devices have been developed. In this paper, a novel forehand attack exercising device of table tennis was designed and manufactured to improve the teaching and training of table tennis, and the basic structure, working principle, processing, technical requirements, operation and applications of the device were described and investigated. With the help of this device, athletes could quickly master essential technical skills and the effect of teaching and training was markedly enhanced.
Analysis of Nonlinear Dynamics and Bifurcations for a Rectangular Symmetric Cross-Ply Laminated Composite Plate with a Parametric Excitation
Authors: Yu Wei Qin , Wang Tian Bo , Li Na
Published: February 2014

Using the analytical and numerical approaches, the nonlinear dynamic behaviors in the vicinity of a compound critical point are studied for a rectangular symmetric cross-ply laminated composite plate with a parametric excitation. The geometric nonlinearity and nonlinear damping are included in the governing equations of motion in this model. Normal form theory, bifurcation and stability theory are used to find closed form solutions for equilibria and periodic motions. Stability conditions of these solutions are obtained explicitly and critical boundaries along which incipient and secondary leading to 2-D tori are also derived. Finally, numerical results are presented to confirm these analytical predictions.
The Applications of GA-BP Neural Networks in Option Direction for Catalytic Agent
Authors: Jiang Lai
Published: February 2014

Although the application of the BP neural network can assist researching on catalytic agent and methods of synthesizing material, but because of slow convergence, in some cases, it can not work efficiently. The paper presents a design method for the application of GA-BP Neutral Network in optimum direction for catalytic agent and material. The simulation result shows that the application of the GA-BP neural network can improve the accuracy and versatility of the catalyst compounding.
Research on the Force-Position Switching Control System of Wire Bonding Head on DSP
Authors: Chen Yong Gang , Yan Qiu Sheng , Gong Hang Jun
Published: February 2014

Presented the force-position switching control system of wire bonding head on DSP.
Analysis of the bond head mechanism design theory,for wire bonding high precision motion control requires, design of the force-position switching control system hardware and software. .
Study on Real-Time Control of Power System Stability
Authors: Wang Hui Yu , Zhang Yong , Zhang Jian
Published: February 2014

This paper presents the design method Delays affect static var compensator WAN additional damping controller, containing static var compensator new power system, for example, through a controlled modal analysis to select Static Analysis conventional additional damping drawing's power compensator WAN input signal is calculated using the residue method to get its parameters, and then analyzed using delay-dependent stability criterion of conventional reactive power compensator damping controller contains additional stationary Delay power system stability, finalized the SVC gain additional damping controller based on delay stability analysis, the results show Delay Considered static var compensator additional damping controller not only can improve the damping characteristics of the system, but also has a certain time lag robustness.
The Design of Phase Shift Soft Switching Full-Bridge Converter Power Supply Based on UCC3895
Authors: Huang Zhi Qi , Song Jian Guo , Sun Meng Juan
Published: February 2014

A high efficiency full-bridge converter is designed and implemented in this paper. The measured data result from the other converter implemented by IC UCC3895 compares with that of the previous converter. This full-bridge converter of phase shift soft switching can obtain about 92% power efficiency in conversion procedure. This design used L-C resonance circuits to achieve power switch tube soft switching.
Optimal Ecological Restoration of Degraded Wetland Ecosystem by Using Satellite Sensors
Authors: Sun Ling , Zhu Ze Sheng
Published: February 2014

Ecological restoration of degraded wetland ecosystem can be achieved by planning experts according to ground investigation, but with low efficiencies. We report that satellite sensors, maximizing ecosystem service values and minimizing ecological restoration cost improve ecological restoration efficiency. In particular, multi-objective linear programming (MOLIP), an optimal programming, improves ecological restoration efficiency by more than 250% in the return on investment of ecological restoration, using TM satellite as area sensors. MOLIP also enables efficient introduction of ecological restoration management without introduction of planning experts and ground investigation.
Research on Wireless MAC Protocols Oriented to Smart Clothing
Authors: Liu Yi , Zhang Yuan Jiao , Wei Ya Wen , Lin Wen Qi , Liu Hao
Published: February 2014

Smart clothing related technology is illustrated. Demands of smart clothing networks (BAN) are low consumption, suitable topology and scalability .Standard to support BAN is IEEE 802.15.6 which is introduced. Properties and comparison of CSMA/CA and T-MAC are presented in detail. BAN is summarized.
Sensor Node Identifier Resolution of IP-Based and Non-IP-Based WSN
Authors: Luo Zhi Yong , Wang Qing , Cai Ting
Published: February 2014

Traditional wireless sensor network(WSN) technology has localization limitations due to the data-centric characteristic.Therefore, it’s very important to introduce identifier resolution technology and the kernel of using identifier resolution technology is to trace sensor node and get the application information and real time data in WSN.This paper designed a sensor node identifier resolution method of IP-based and non-IP-based WSN,and it gets the sensor node production property information through Internet-based sensor node identifier resolution,while the real-time data and application property of sensor node in practical environment are obtained by WSN-internal sensor node identifier resolution.The process of sensor node identifier resolution is validated to be effective with being applied in the smart home system.
About the Future of UTC
Authors: Dong Shao Wu
Published: February 2014

The Coordinated Universal Time (UTC) is the international reference time-scale, and provides the basis for broadcast time signals and for time-keeping in the large majority of countries. In its current form, UTC is computed as the average of a large number of atomic clocks and its scale interval is based on the second in the International System units (SI), but it is adjusted by the occasional insertion of one second (called as leap second), to maintain close alignment with Universal Time 1 (UT1), a time-scale determined by the rotation of the Earth. The UTC system with leap seconds is not a continuous time scale, in resent years, several countries and international organizations have started a discussion on the need to abolish the application of leap second in UTC, however, some countries oppose it. Issues on leap second worldwide are presented in this paper.
Sequence Determination of Cd and Pb in Honey by Incomplete Digestion-High Resolution Continuum Source Graphite Furnace Atomic Absorption Spectrometry
Authors: Liu Hui , Chen Shang Long , Li Chao , Li Tong Xiang , Wu Yong Hua , Liu Yi
Published: February 2014

A fast and effective method was developed for sequence determination of Cd and Pb in honey by incomplete digestion-high resolution continuum source graphite furnace atomic absorption spectrometry (HR-CS GFAAS). Cd and Pb in some honey samples using incomplete digestion treatment were measured by HR-CS GFAAS. The factors influencing determination were investigated by single factor experimental design. The optimal determination conditions were found as follows: NH4H2PO4(10mg/mL) were added as a chemical modifier with the volume of 5μL; pyrolysis temperature 600°C(Cd) and 800°C(Pb); atomization temperature 1100°C(Cd) and 1400°C(Pb). Detection limits (3σ,n=12) were found to be 0.06 μg/L and 0.78 μg/L for Cd and Pb, respectively. The precisions (RSD) for 6 replicate measurements of Cd and Pb in honeys were 3.8% and 2.6%, respectively. Recoveries of added Cd and Pb were varied from 95% to 103%. Therefore, the proposed method was rapid, accurate and stable with a high practical value. It provided scientific basis for multi-element sequence determination in food.
Development of a Transducer for Dental Implant Stability Measurement
Authors: Lin Ming Jer , Tsai Tung Lin , Wu Xian Ru , Cheng E. Hsung , Yeh Nan Ming
Published: February 2014

This study focuses on the development of transducers for Osstell® Mentor in measuring stability of various implant systems. Experiments are performed to verify the compatibility of a self-made transducer. An acoustic signal analysis system is introduced to analyze the acoustic signal emitted from the Osstell® Mentor probe, and the frequency with peak amplitude in the amplitude-frequency plot is identified. The resonance frequency obtained is found to be linearly dependent upon the ISQ value by Osstell® Mentor. This finding is helpful for developing compatible transducers for various implant systems.
The Design and Application of the Groundwater Monitoring System Based on the Internet of Things in the HeiHe River Basin
Authors: Shi Yun , Zhang Lei , Wei Guang Hua
Published: February 2014

Aiming at the present status of the groundwater monitoring in HeiHe river basin, the groundwater auto detecting system was designed based on the internet of things, this system has several features such as high integration, low power consumption, minitype, computerization. The hardware and software of the monitoring device were introduced in the paper and several measures were taken to reduce the power consumption and improve reliability. The system mainly solved several key technologies including monitoring data collection, transmission, management and remote control. Through one-year field experiment, it is found that the system run well. Finally the successful designed system would make a contribution to the groundwater monitoring for our country.
Query Recommendation Based on Document Content User Focuses on
Authors: Zhang Bo , Yang Feng Ze , Fan Li Nan
Published: February 2014

To the problem of text elements outside main content of clicked documents have big negative impact on the precision of query recommendation, this paper proposed a query recommendation method based on document content user focuses on, which fused similarity computation among queries with the filter of text elements outside main content of clicked documents. Experimental result shows that the method proposed by this paper can raise the precision of similarity computation among queries, and then raise the precision of query recommendation.
Pseudo Two-Hop Distributed Consensus with Noise
Authors: Peng Huan Xin , Liu Bin , Wang Wen Kai
Published: February 2014

In this paper, we analyze the pseudo two-hop distributed consensus algorithm with communication noise. If there is communication noise among agents, the convergence performance of distributed consensus algorithms degrades. Supposing that the communication noises are zero-mean Gaussian white noise, and the noises are irrelevant and independent in time and spatial, we analyze the convergence performance of the pseudo two-hop distributed consensus algorithm with noise, and calculate mean square errors and the upper bound of mean-square error of the pseudo two-hop distributed consensus algorithm. Finally, simulation results are provided to verify these analytical results.
Research on MWD Mud Pulse Signal Waveform Identification Algorithm
Authors: Tu Bing , Yu Guo , Zhan Teng Xi
Published: February 2014

Measurement while drilling (MWD) technology uses mud pulse signals in real-time observation bottom of the relevant data, the decoding system on earth will detect and recognize the information received from the shaft bottom. It is one of the core technology of MWD. However, there are all kinds of noise that exsit in the signal channel will create interfere of signal transmission with the date identification error .This article first offer a new way based on the analysis of the Manchester mud pulse signal noise code and attenuation model. At the same time it used NLMS(Normalizod least mean square) adaptive filter algorithm to wipe the pump noise and other interferences .It can more effectively decrease the influence by pump pulse base-value. Due to the features of mud pulse, we apply the waveform identification algorithm to the recognize research after get the data. Finally, field test results showed that the waveform identification algorithm can recognize the mud pulse correctly and the decoding process is easier, higher reliability, lower ber by the field test. All these comply with the requirements of the engineering application.
Analysis on Graduate Employment Based on Data Warehouse
Authors: Zhan Xiao Yi
Published: February 2014

Data warehouse is a subject-oriented, integrated, stable and time-variant data collection which can be applicable in decision analysis. In a background of university teaching administration, this paper takes as the research object the data accumulated in teaching administration system over the years, primarily probes into the building of data warehouse for employment management and, by using the tool of OLAP, conducts the multi-dimensional analysis on the feedback data on graduate employment provided by the employers, in a hope of supporting the middle-level teaching administrative personnel in universities to make decisions.
The Bistatic MIMO Imaging Algorithm Based on Waveform Diversity
Authors: Huang Cong , Zhang Dian Lun , Sun Da Jun , Teng Ting Ting
Published: February 2014

Due to the large distance between transmitting array and receiving array in bistatic MIMO, The bistatic MIMO is unable to use the waveform diversity technology base on the monostatic MIMO to improve the resolution of the detection. And bistatic MIMO angle estimation algorithm based on the spatial spectral estimation is unable to get coherent gain from beamforming. In this paper, position calculating of the bistatic sonar is used to get the relationship among DOD DOA and propagation distance. The array manifold of virtual array is constructed in each scan position in 2-d imaging. The improved waveform diversity technology is used in the imaging of bistatic MIMO to improve the resolution of the detection.
Study on Regression Model of Measuring Weld Position
Authors: Li Zhao Yu , Gao Xiang Dong
Published: February 2014

Seam tracking technology is an important area of research automatic arc welding, precise seam tracking is crucial to achieve high quality welds. In order to achieve precise seam tracking, seam deviation ( the weld center arc deviation) detection is a key. Unlike the conventional method by image processing techniques to obtain the seam deviation information directly, but selected image processing area (including the distal end portion of the molten pool welds and the front end of the pool), and analyzed as a pool image centroid characteristic parameters of the weld deviation. Study these parameters to create a new method for visual weld deviation measurement model, establish the linear regression model between pool image centroid deviation and the weld based on regression analysis theory.
Compressive Strength Analysis of MWD Microchip Tracer
Authors: Li Ji Bo , Ni Wei Ning , Li San Guo , Zhu Zu Yang
Published: February 2014

Pressure resistant performance of Measure While Drilling (MWD) microchip tracer to withstand the harsh downhole environment is one of the key issues of normal working. Therefore, it is an effective way to analyze pressure resistant performance of the tracer in the design phase. Compressive strength of the tracer was studied based on finite element method. Considering downhole complexity and working conditions during the processing of tracer roundness, material non-uniformity and other factors. In this study, researchers took sub-proportion failure criterion to determine the failure of tracer. Simulation results of two structures, with pin and without pin, show that both structures met the requirement of downhole compressive strength, and the structure with pin was better than the structure without pin. This study provides basis for downhole application of microchip tracers.
Seal Optimization Technology Research of Large LNG Storage Tank Dome Gas Lift
Authors: Yan Jing Peng , Yang Gong Sheng , Wei Xiong Biao , Su Juan , Zhang Qing , Lv Zhe
Published: February 2014

Dome gas lift is the technical difficulties of a large LNG (liquefied natural gas) tanks in the process of construction. The sealing structure is one of the core link in the process of the gas lift. In this paper, the seal structure of large LNG storage tank dome gas lift is studied. A new kind of sealing structure is designed by using gap seal. This paper has carried on the simulation analysis with ANSYS software to verify the feasibility of new type sealing structure. This kind of sealing structure can reduce the friction in the process of gas lift. It also can use the smaller contact area to achieve good sealing effect. The method has important practical value in enhancing the security of gas lift of LNG storage tank dome.
Research and Design of Shortwave and Ultra-Short Wave SDR Engineering in Urban Emergency System
Authors: Zhang Mo
Published: February 2014

The paper first introduces the basic concept of shortwave and ultra-short wave software defined radio (SDR) programs and the latest technical development in this area. Then we introduce the implementation of the shortwave and ultra-short wave SDR system and the workflow of each module. Based on a survey on the business markets and the technologies, we design a shortwave and ultra-short wave SDR system to meet the market requirement and technical standard. Its features include setup flexibility, scalability and operational simplicity. The design of functionality, software, hardware interface as well as parameters and targets is proposed accordingly. Finally, through engineering study and design, the proposed SDR system is expected to play a key role in emergency communications of urban areas to deal with some emergent events such as evacuation and sheltering.