bluuebunny/crossref_metadata_2025 huggingface dataset:
Influence of the Groove Width on the Aerostatic Dry Gas Seal
Authors: Xu Heng Jie , Song Peng Yun
Published: August 2013

Aerostatic dry gas seal has attracted more and more attention because of its advantages with low friction loss, low heat generation, large opening force and high gas film stiffness at low-speed operation situation. The influence of the radial groove width ratio,Bw, on the performance of the aerostatic dry gas seal has been investigated by an analytical method by solving the N-S equation in order to understand the performance of the seal further more. The results show that the effect of the radial groove width ratio,Bw, on the opening force and on the gas film stiffness is obvious. The opening force decreases with the radial groove width ratio,Bw, increasing at the same gas film thickness. The situation of the gas film stiffness is complex. When the gas film thickness is smaller than a critical value, about 6μm as to the example presented in this paper, the gas film stiffness increases with theBwincreasing, but the gas film stiffness decreases with theBwincreasing when thickness is larger than the critical value. With the increasing ofBw, the leakage to the atmosphere,Q2, increases, but the leakage to the process fluid,Q1, reduces.
Deformation Analysis of Beam Pipe Installation Mechanism for EPC
Authors: Zhao Li Bin , Shan Mei Juan
Published: August 2013

Beam pipe is a key part of the electron positron collider (EPC). It is very expensive and hard to install due to a limited room and high assembly precision requirement. In order to ensure the beam pipe being installed successfully, an installation scheme is introduced. Key factors affected the deformation of installation mechanism are presented by classical mechanics theory. Different finite element models were analyzed to obtain an optimal geometry size for the protective shaft based on commercial software ANSYS®. The deformation of the determinate installation mechanism satisfies the engineering requirement well.
Finite Element Analysis and Topology Optimization Design for Front Platen of Injection Molding Machine
Authors: Zhang En Guang
Published: August 2013

The weight of platens accounts for about 70% of the entire clamping device of injection molding machine. The reduction in the weight of platen means the reduction in the cost of injection molding machine. UG NX8.0 was adopted to conduct the parametric design, and UG NX8.0 Advanced Simulation module was adopted to conduct the finite element analysis and the topology optimization design for the front platen of injection molding machine so as to obtain the quantitative conclusions that the volume of platen is reduced and the stiffness as well as the strength is improved. The maximum deformation of platen is decreased by 6.2%, the volume is decreased by 6%, the maximum stress is decreased by 6.6% and the average displacement of all the nodes in the mold mounting plane is decreased by 9.1%. The effect of optimization is obvious.
Numerical and Experimental Researches of 1:10 Tank Car Longitudinal Vibration with Fluid Sloshing
Authors: Liu Zhi Sheng , Zhang Ji Min , Wang Yong Qiang
Published: August 2013

A 1:10 tank-car 2D fluid simulation model based on the computational fluid dynamics is established, and exchange the data with tank-car vibration model while simulating. In the paper, the 2 dimension fluid-structure coupling tank-car which owns two DOF is simulated, and the affect of fluid sloshing to tank-car longitudinal vibration is analyzed through the coupled vibration experiment. In the simulation and experiment, fluid sloshing increased the tanker longitudinal vibration acceleration amplitude and slowed response time is obtained through analyzing the difference between the different volume of fluid and the relevant solid without sloshing, and the difference of longitudinal vibration between full tank and non-full tank is significant.
Effect of Lubrication on the Erichsen Test
Authors: Giuliano Gillo , Samani F.
Published: August 2013

This study analyzes experimentally the influence of the friction between the sheet metal and the die surfaces on the results of the Erichsen test in terms of load-displacement curve of the punch, the normalized thickness measured at the specimen apex and the distance measured between the thinnest area of the specimen and the lateral surface of the blankholder. Two types of aluminium alloys, AA 2017 Al-Cu alloy (Al-4.5%Cu-1.0%Mn-1.0%Mg) and AA 5083 Al-Mg alloy (Al-4.5%Mg-1.0%Mn-0.15%Cr), with thickness of 1.0 mm are selected as the experimental materials for Erichsen test.
Study on Dynamic Roll Stability of Articulated Engineering Vehicle Based on Virtual Prototype
Authors: Hao Wan Jun , Wang Guo Qiang , Qu Jun Na , Li Xue Fei
Published: August 2013

Most rollover accidents involve articulated engineering vehicle due to the center of gravity shift when steering. In this paper, a virtual prototype model of a loader as the typical articulated engineering vehicle is built using multi-body dynamics software. The dynamic simulation of steering characteristic under different slop and speed is made and the roll stability is analyzed. The stable working range of the loader obtained from the simulation results can give reference for the drivers selection of vehicle route and safe operation. This paper has a certain meaning for further study of articulated vehicles roll stability.
Design on Vehicle Steering Mechanism and Research on its Steering Error Properties
Authors: Wang Hong Xin , Dai En Hui
Published: August 2013

sosceles trapezoid mechanism is widely used as vehicle steering mechanism because of its symmetrical characteristic in positive and negative steering motions. Design equations of the isosceles trapezoid mechanism are set up and solved through iterative method. Steering error is analyzed and reappeared by diagram of curves. The exactitude on the design results is proved by design example.
The Optimization Design of Opening and Closing Mechanism of Aerodynamic Braking in High-Speed Train
Authors: Tian Chun , Wu Meng Ling , Li Cheng , Zhu Lu
Published: August 2013

Aerodynamic brake is a new type of non-adhesion brake mode used to high-speed train brake by unfolding the brake panel on the roof of the high speed train to increase aerodynamic resistance. This brake mode is effective especially in the condition of high speed. The article is aimed at designing a set of opening and closing mechanism to control the movement of the brake panel. The opening and closing mechanism mainly include three components of guide mechanism, the center of rotation and drive mechanism. The guide mechanism as auxiliary orientation is a functional unit of the bearing parts used to improve the movement and load conditions of the brake panel. The center of rotation is the key component to support the brake panel and transmit the braking force. The drive mechanism, the power source of the opening and closing mechanism, is designed to drive the brake panel up and down in the reciprocating motion. This paper focuses on the design of the three components, using the method of combining structural design and reliability design and aiming at the final optimal design.
Analysis on Evolution of Car Carrier Based on Theory of Technology Evolution
Authors: Zhang Ming Qin , Sun Da Ming , Wang Qing
Published: August 2013

In order to predict the development direction of stereo garage car carrier to accommodate the present need of transportation, combined technology system of car carrier with evolution routes belongs to evolution patterns in theory of technology evolution. Relationships between total system and evolution routes, relationships between subsystem and evolution routes were built, on the basis of researching the structural feature of stereo garage car carrier, analyzed the evolution rules of total system andsubsystems along different evolutional routes, indicated its present evolutionary state and predicted the future development direction. It is helpful for enterprise to accurately predict the next generation of product and greatly improve market competitiveness.
The Research of Sliding Boot Design Based on Compliance Characteristic
Authors: Liu Jie , Gao Feng , Xu Guo Yan
Published: August 2013

With the purpose of improving vehicle trafficability on invertebrate terrains, an new kind of walking device sliding boot is designed. The sliding boot clamped on the front wheel as a plier, when vehicle is running on invertebrate terrains. The vehicle is in the morphology of the front wheel sliding and the rear wheel driving, as floating-submerging platform. With the relation between the tire rubber and sliding boot as the breakthrough point, the synthesis and analysis of sliding boot design is researched. Firstly, the mechanics equilibriums are analyzed. The deformation between the sliding boot and the front wheel is analyzed based on compliance. The research method of sliding boot is verified by test. The test verifies the sliding boot could clamp tire moderately and meet the vehicle driving requirements. The research method is reasonable and practicable.
Description and Smoothing of NC Motion Path Based on the Cubic Trigonometric Interpolation Spline
Authors: Tao Jian Ming , Song Ai Ping , Yi Dan Ping
Published: August 2013

In order to better describe the complex motion path of NC machining and realize the smooth transition between path segments, a kind of cubic trigonometric interpolation spline curve was put forward based on a set of special basis function. The spline curve which with adjustable shape satisfies the C1 continuity and it can accurately describe some common engineering curves such as straight line, circular arc and free curve. According to the given information of control points, different shapes of interpolation spline curve can be gotten by changing the adjustment coefficients. Through selecting proper control points and shape adjustment coefficients near the corner, insert the spline curve can realize the smooth transition at the corner of adjacent NC motion path segments, which can ensure the stability of motion path and the continuous of feed speed. Meanwhile, it also can reduce the impact to NC machine.
Modeling and Simulation of Continuous Flexible Roll Forming Process
Authors: Sui Zhou , Cai Zhong Yi , Li Ming Zhe
Published: August 2013

The continuous flexible roll forming process is a novel sheet metal forming technique for effectively manufacture of three-dimensional surface parts. In this study, two types of finite element (FE) models were developed under the ABAQUS/Explicit environment. The difference of the two models is that the rolls are defined as discrete rigid bodies in model No.1 and are deformable in model No.2. An experiment was carried out using the continuous sheet metal forming setup. The comparison of the numerical computation results with the experimental results shows that the model No.2 can be used for the shape prediction of continuous flexible roll forming process well.
Design of Data Acquisition System for Fiber Optic Gyro Based on the FAT32 File System
Authors: Cai Ying Bo , Zha Huan , Wei Xue Tong
Published: August 2013

Demand for high-speed fiber optic gyroscope data acquisition and real-time record, the design of the SD Card as storage medium to large capacity fiber optic gyro high - speed real - time acquisition and bulk storage systems, The system by applying the sd2.0 protocol and fat32 file systems in the system, enable real - time Data Acquisition of fiber optic gyro and large capacity storage. Experiments have shown that the system properly designed, easy to use, high reliability to meet the actual demand, is of important practical significance.
Selection of the Appropriate Type of Sensory Equipment
Authors: Sebenova Silvia , Šimúnová Michala , Velíšek Karol
Published: August 2013

In this contribution is presented the method of choice of the right sensor. The selection of appropriate sensory equipment means a completion of requirements. Unfortunately, very often these requirements are not exactly known or detail. The first issue of designer is to get the most information about future applications of measuring device, all appropriate conditions of operations, etc. The short list of requirements should be the most detailed.
The Research of RITS Time Synchronization Algorithms in WSN
Authors: Zhang Yun Peng , Zheng Zhen , Zheng Shuang Xi , Huang Yun Ting , Karanfil Yasin Hasan
Published: August 2013

Time synchronization is a new hotspot in the research of wireless sensor network technology (WSN). Even though many applications of WSN require the clock of sensor nodes to keep synchronization, the traditional time synchronization algorithms are not suitable for WSN because of the characteristics of WSNit has special requirements in synchronous scope, energy consumption and synchronization precision. For this paper the Routing Integrated Time Synchronization (RITS) algorithm was analyzed. Furthermore, by averaging the multiple sets of data received by the target node and constructing a best fit straight line with the multiple received  pairs, the RITS algorithm is being improved. Analysis showed that: improved algorithm inherited the advantages of the original RITS algorithm and improved the time synchronization precision to a certain extent.
Study on Pairwise Bundle Adjustment and One Dimension Wand Calibration for Cameras Group
Authors: Luo Xun , Zhao Wei , Zhang Hai Nan
Published: August 2013

It is proposed a method of cameras group calibration with pairwise bundle adjustment using one dimensional wand. The one dimensional wand is one of the simplest calibration tools with two distinguishing markers the distance between which is known. The wand with the markers moves unconstrained in the field of cameras group, acquiring the coordinates of the projections of the corresponding marker in each camera. Every two cameras are formed as a couple, which fundamental matrix, focal lengths, rotation matrix, translation matrix and scale factor can be estimated under a few of certain assumptions. Optimal solutions are obtained through the pairwise bundle adjustment. The group calibration result is demonstrated as a sort sequence of all of the couple calibration results in ascending order according to reconstruction errors. The couple as top ranked as possible will be used to reconstruct the object in application procedures. Experimental results show that the dual couple method has much more accuracy and maintain the same feasibility comparing with the other one dimensional object calibration methods.
Geometrical Shape Analysis for Investment Casting Turbine Blade Based on Optical Measurement
Authors: Cheng Yun Yong , Zhu Zhen Zhen , Zhang Ding Hua
Published: August 2013

Turbine blade is one of the key components of the aero engine. It needs to be inspected comprehensively and carefully during its production stage. The methods for investment turbine blade geometrical shape analysis based on optical scanning measurement were presented, including optical measurement data collection, blade model reliable alignment and geometrical shape deviation fast calculation and visualization. Real measurement data from a structure light measurement device for a turbine blade was used to validate the discussed methods.
Applying Full Vector Spectrum for Electric Hoist Gearbox Fault Diagnosis
Authors: Li Hao , Dong Xin Min , Hao Wang Sheng , Liu Ai Guo , Yin Xian De , Wang Ai Jun
Published: August 2013

To resolve the noise and incomplete information of rotor vibration signals for electric hoist gearbox, the full vector spectrum technology is applied for information fusion and wavelet analysis. The full vector wavelet is used to de-noising process for the vibration signals, which extract the more complete characterization information of the noise signal. First, the dual-channel vibration signal wavelet decomposition and reconstruction, and then take advantage of the full vector spectrum technology fusion for the reconstructed signal. In this way, which ensure the integrity of the vibration signal feature information, more reliably reflect the vibration characteristics of the rotor, and improve the accuracy of fault diagnosis.
The Research on Design and Manufacture of AC Resistor
Authors: Chen Wen Li , Hou Xing Zhe , Wang San Qiang , Liu Dan , Sun Kai Xia
Published: August 2013

Ohm is the basic unit of electric parameter. Its quantity transferable system is achieved by the ohm resistor. The quality of the ohm resistor is directly related to the accuracy and reliability of quantity transmission system. Ohm resistor can be divided into DC resistor and AC resistor to use. With the development of modern electronic technology, the AC resistor attracts more attention. The design and manufacture of AC resistor has always been difficult which involves cross-integration of the mechanics, electromagnetic and material science, the design effect of most products is not ideal. The technical features, design principles and factors in manufacturing are present in this paper for AC resistor manufacture and test units.
Vibration Isolator Design for Space Application Based on Multiobjective Optimization Method
Authors: Feng Zhi Wei , Tang Qian Gang , Zhang Qing Bin
Published: August 2013

A multiobjective optimization based vibration isolator design for space application is described. It is common to use passive isolator and isolate the platform noise in space applications. The design of a passive isolator involves a trade-off between the resonant peak reduction and the high frequency attenuation. The equation of motion and transfer function model for single-stage and two-stage connector model is derived by using basic principle. The multiobjective optimization model is proposed, where the design variables are the damping coefficients and stiffness coefficients, the objective functions are the resonant peak reduction and the high frequency attenuation, and the constraints are the natural frequency of the connector. The multiobjective optimization problems for the design of the passive isolator are solved by using the multiobjective evolutionary algorithm based on decomposition (MOEA/D). The Pareto front obtained can provide multiple candidate solutions for the designer. The method is effective for the design process of the passive isolator.
A Service Reliability Assessment Method for the Rigidity-Flexibility Coupling Open Arc Welding Robot
Authors: Han Xing , Li Chang , Ma Xiao Gang
Published: August 2013

The open arc welding robots have been used widely nowadays; however, the elastic deformations of every inner link inevitably affect the welding quality. In this paper, it proposes an effective method of service reliability assessment for the rigidity-flexibility coupling open arc welding robot. Firstly, a parametric virtual model of the robot is built in ADAMS/View-AutoFlex module. Secondly, the stochastic errors generated in the working process are simulated by a program created from pseudo-random numbers which have been written by multiplicative congruence method. Lastly, Monte Carlo sampling calculation is implemented for the virtual model, and large sample data of the dynamic characteristics in welding process are obtained and used to calculate the service reliability of the welding robot. This method includes simplicity (no need to solve complex mathematic model) and high accuracy which make it highly promising for application in mechanism design.
Backstepping-Based Adaptive Fuzzy Sliding Mode Control for Autopilot Design
Authors: Wang Jin , Zhang Min
Published: August 2013

A backstepping approach, combined with adaptive fuzzy sliding mode control, is used to design a missile autopilot in this paper. The proposed scheme separated the plant into two subsystems, such that single controllers can be designed and therefore the stability of entire system is reached automatically. The single control laws are designed using sliding mode control based on the Lyapunov stability theorem, and the adaptive law is derived to adapt the value of the lumped uncertainty in real-time. Moreover, with the universal approximation ability, an adaptive fuzzy system is used to approximate strong coupling nonlinear dynamics of the missile during large angle-of-attack flight and provide robustness to parametric uncertainties in the missile aerodynamics.
On-Site Skill Examination System for Crane Operators Based on Distributed Cooperative Control Technology
Authors: Feng Jian Ping , Chen Ben Yao , Jin Ye Fu , Pan Bin
Published: August 2013

For the deficiencies in the on-site skill assessment of crane operators, an on-site skill examination system for crane operators based on distributed cooperative control technology is designed. The functions and implementations of various monitoring sensor module, wireless data acquisition system and the hosting control center are discussed. This system can help to improve the scientificity and fairness of the assessment work of crane operators.
The Improved Design of Test Machine Linear-Velocity Closed-Loop Control Circuit
Authors: Li Chang Hai , Yu Yuan Tao , Ma Shi Yang , Liu Yan Chun
Published: August 2013

Incremental PID has its shortcomings: great integral truncation effect, static error and spillover affect. In the control system, the controller system is required having a quick response speed, and also a certain anti-interference ability. When adopting the improved differential PID control algorithm, only the output differential is made, instead of the given values. So, when a given value changes, the output will not change, and the controlled quantity change is usually mild, in which case the control accuracy is improved, and the system dynamic characteristics is greatly improved.
Industrial Sewing Machine Design and Development of Digital Design and Simulation Platform
Authors: Zhang De Fa , Gao Yi Cong
Published: August 2013

In recent years, industrial sewing machine intelligence can be increased. Compared with the traditional equipment, the new generation of domestic equipment in the "high efficiency, energy saving, special" has realized great-leap-forward development. In the performance, will towards high precision, high efficiency, high performance, intelligent direction; in function, to the miniaturization, multi-function direction; in the program, to the systematic, integrated direction. The design and development of industrial sewing machine digitization design packaging platform are discussed.
Constrained Ruled Surface Reconstruction for 5-Axis NC Machining of Aero-Structure
Authors: Bi Qing Zhen , Lu Yao An , Li Zhou Long , Zhu Li Min , Ding Han , Liu Gang
Published: August 2013

We proposed a constrained ruled surface approximation algorithm for 5-axis machining of aero structure. Ruled surface is widely used in the design of aero structure. In practical model process, the regular ruled surface is usually split into some small fragmentary surfaces. The segmentation of the original surface mainly comes from some iterative boolean operations on the ruled surface. The segmentation destroys original parameter lines and leads into complex curved boundaries. Furthermore, the obtained fragmentary surfaces deviate from the original ruled surface because of the accuracy loss in the boolean operations of 3D CAD software. Some gaps between the small surfaces often appear. In manufacturing process, it is difficult to generating high-quality tool path for the surface with disordered parameter lines, curved boundaries and gaps. The proposed ruled surface approximation algorithm provides an effective way to reconstruct the smooth ruled surface. The constraints of boundary and smoothness are both considered. The ruled surface for simultaneous 5-axis machining is finally obtained. This algorithm have been integrated into CATIA V5 system and applied in practical manufacturing planning of aero-structures.
Automatic NC Programming for Chamfering Addendum of Spiral Bevel Gear Based on UG/Open
Authors: Wei Xiu Ting , Zhu Jian Ping , Li Gang
Published: August 2013

A chamfering algorithm was put forward to achieve automatic NC programming for chamfering addendum of spiral bevel gears and a NC programming module was developed based on UG/Open through secondary development. Furthermore, a practical example was used to demonstrate the automatic NC code generation process for chamfering addendum according to the preset chamfer surface and its permissible error.
Logistics System Simulation Optimization Process
Authors: Dao Rong Gui , Yu Zhong Jiang , Wu Bo Gang , Luo Bing
Published: August 2013

Simulation method to optimize logistics system was studied. The process of this method were pointed out, which main process were DOE and AVONA. Analysis of automatic sorting system based on this method, the significant factors influencing were renovated, including scheduling strategy and equipment technology, so the system was optimized. Thus draw the conclusion: (1)Simulation modeling showed the operation data of logistics system without conditions in physical testing; (2) Method of DOE and mathematical statistics could be selected optimal schemes and pointed out the significant factors that influence efficiency of the system; (3)Reasonable logistics scheduling strategy and renovating equipment technology of significant factors were the fundamental method to optimize logistics system.
Building the Panoramic Image for Mobile Robot Localization
Authors: Popov Vladimir , Gorbenko Anna
Published: August 2013

Visual landmarks are extensively used in contemporary robotics. There are a large number of different systems of visual landmarks. In particular, fingerprints give us unique identifiers for visually distinct locations by recovering statistically significant features. Therefore, fingerprints can be used as visual landmarks for mobile robot navigation. To create fingerprints we need one-dimensional color panoramas of high quality. In this paper, we consider a method for building the panoramic image using string matching algorithms. In particular, we propose the shortest common ordered supersequence problem.
Life Prediction and Verification under Multiaxial Fatigue Loading
Authors: Wang Lei , Sui Tian Zhong , Tian Qiu Cheng
Published: August 2013

The strain change characteristics of multiaxial fatigue are analyzed under the condition of the combined tension and torsion loading for thin-tube specimen. Based on the principle of multiaxial critical plane approach, a multiaxial fatigue damage parameter is established, which takes account of the effect of not only the maximum shear strain amplitude and normal strain amplitude on the critical plane but also the parameter of non-proportionality. The non-proportionality is the function of loading parameters which is closely contact with the strain change characteristics of multiaxial fatigue and it can indicate the whole material damage. The experiments under the tension-torsion proportional and non-proportional loading were conducted to verify the multiaxial fatigue life model proposed in this paper. The life prediction has a good correlation with the experimental results.
Modeling and Simulation of Dynamic Property of Vehicle Frame Based on Finite Element Method
Authors: Kong Sheng Li
Published: August 2013

The dynamic property of vehicle frame directly affects the safety and comfort of whole vehicles. In order to fully understand the dynamic properties of vehicle frame, both finite element beam and shell models for vehicle frame are established and the natural frequencies of vehicle frame in free working conditions are obtained. The results from beam model and shell model have high accuracy. Those results can be helpful for improvement and optimization of the vehicle frames.
A Transform Free Higher Order Compact Finite Difference Scheme for Simulating the Flow behind a Rotationally Oscillating Circular Cylinder at Reynolds Number 500
Authors: Mittal H.V.R. , Ray Rajendra K.
Published: August 2013

Two-dimensional incompressible, viscous fluid flow around a rotationally oscillating circular cylinder is studied numerically by using a recently developed higher order compact finite difference scheme (HOC) at Reynolds number Re = 500. The stream function vorticity formulation of Navier Stokes equations in cylindrical polar coordinates are considered as the governing equations. Different values of peak rotation rate αmand forced oscillation frequency feare considered. The simulated results are in a good agreement both qualitatively and quantitatively with the previously published results.
Design of CPM Training Machine of Recovery for Knee Joints
Authors: Zhu Li Li , Wang Guang Xin , Li Dan
Published: August 2013

The purpose of this paper is to introduce a new design of CPM training machine of recovery for knee joints which provides a constant-speed, translational and steady recover environment. A parallelogram mechanism and a magnetorheological fluid mechanism are used to ensure the patients not only to perform passive train in the earlier period after operation but also do active train in different stages without the influence of gravity compensation. The training machine makes the recover motion meet the physiology need of the joint motion after operation and has the applicable significance in medical practice.
Performance Comparison between PID Controller and State-Feedback Controller with Integral Action in Position Control of DC Motor
Authors: Chowdhury A. , Debnath D.
Published: August 2013

This paper presents the design of PID controller and State-Feedback controller with integral action to control the position of DC motor.PID controller is tuned using Ziegler-Nichol’s rules. State-Feedback controller is designed by determining the state feedback gain matrix using Ackermann’s formula. The aim of this paper is to compare the time domain characteristics of system response between PID controller and State feedback Controller with integral action. The Simulation results are demonstrated using MATLAB.Graphical User Interface (GUI) is developed for both the controllers. According to the Simulation result, State-Feedback controller with integral action has the better performance in terms of peak overshoot and settling time as compared to PID controller.
Simulation of Contact Bouncing Behavior in Starter Solenoid and Exploring Potential Feasible Solution
Authors: Naik Nithesh , Bhat Chandrasekhar , Rao Pallanti , Christopher J. , Saldanha Faber , Shenoy Prajwal
Published: August 2013

In this paper, investigation on starter solenoid to develop a generalized model based simulation methodology to simulate contact bounce characteristics and tuning of the parameters to reduce or eliminate the contact bounce in existing solenoids complying with all functional and cost constraints. Using the measured data, a generalized model based simulation methodology is built using Matlab Simulink to establish contact bouncing characteristics, which is highly non-linear in nature, under various conditions/parametric variations like electromagnetic force, air gap, hard stops, spring rate and mass. The simulation model reveals that the contact bounce is reduced to zero when the stiffness of the spindle spring is in the range of 1050 N/m to 1250 N/m. Thus we can conclude that the methodology adopted helps in understanding the characteristics of existing solenoids and providing practical suggestions for potential feasible modifications that can be incorporated in the existing solenoids so as to tune their physical system parameters for an optimum response.
Study on Neutral Grounding Mode of Generator in III Nuclear Power of AP1000
Authors: Xiong Zai Bao , Su Guang , Zhang Xian Fei , Yu Xiao Ming
Published: August 2013

In order to solve the question that the stator grounding fault current becomes bigger for large capacity of AP1000 generator, one Neutral grounding mode is studied in this paper through analyzing the principle on Large Generator with Compensation Resonant Neutral Grounding. Compared with High Resistance Grounding, this mode can limit the grounding fault current and protect the stator and winding better. Based on equivalent circuit model one 1250MW generator of AP1000 Plant is simulated, the data showed the method is feasible for AP1000 generator.
Statistical Inference for Zero-Inflated Poisson Regression Models with Excess Zeros
Authors: Dai Lin , Fu Ying Zi
Published: August 2013

In this paper, we deal with a class of zero-inflated Poisson regression models and propose a score test procedure for assessing whether there exists zero-inflation or not. The sampling distribution and the power of the score test statistic are investigated by a limited simulation study. Furthermore, a Bayesian inference procedure is also presented for comparison. Finally, a data set of fire accident is used to illustrate our methodology and our numerical results show that our approach is useful and appealing for the analysis of count data with zero-inflation.
Controllability Property of a Superlinear Climate System
Authors: Zhang Liang , Liu Yang
Published: August 2013

This work concerns a climate system in the point of view of controllability. We obtain by the Kakutani’s fixed point theorem and the controllability property of the linear parabolic equation that the superlinear climate system is null controllable in the case with interior control.
High Accuracy DEM Reconstruction Using SAR Clinometry and Interferometry Method
Authors: Hou Jian Guo , Chu Yu
Published: August 2013

In this paper, a novel method is proposed by combining of radar clinometry and interferometry to improve the accuracy of digital elevation model (DEM) reconstruction. In synthetic aperture radar (SAR) signal processing, the interferometry method uses a couple of high-coherence SAR complex images and the clinometry method uses only one. On one hand, interferometry-derived DEM is much more accurate in regions of higher coherence than the clinometry one. However, in regions of lower coherence, some pronounced errors are produced with the interferometry method due to phase filtering and unwrapping problems. On the other hand, the clinometry method can produce a more robust DEM result by using the intensity of SAR image. Therefore the clinometry-and interferometry-derived DEM is fused by introducing a user-defined weighting factor, where in regions of higher coherence, the DEM results with the interferometry method are remained, and in regions of lower coherence, the interferometry-derived DEM is updated with the clinometry-derived one. Finally, the experimental results with Envisat data show the effectiveness of our approach.
Study on Plant Water Stress Based on Ultrasonic Acoustic Emissions
Authors: Wang Jian Xin , Gao Xian Wei , Sui Mei Li , Li Xiu Ying
Published: August 2013

The soil water deficit and strong transpiration can give rise to the phenomenon of plant water stress. Because of the water stress produces the fracture of the water column in conduits, and the fracture is the reflection of energy release which can be detected by the ultrasonic acoustic emissions (UAEs) technology. In order to avoid background noise interference, the UAEs detecting frequency is between 100K Hz and 1 MHz. The PCI-2 data acquisition (DAQ) card and R15 sensors are used to improve the precision of UAEs detection. When the water stress and dehydration gets heavier, the UAEs get higher. Use the tomato plant data with the empirical deduction under the modern greenhouse conditions, the relationships among UAEs, transpiration and UAEs signal strength is described by curve. The UAEs signals occur generally from 5:00~7:00 am, and stop after 20:00 at night. In the daytime, when the plant body water storage is few, and transpiration is strong, the UAEs occur two peaks, called the “Twin Peaks Area” (TPA). In the different conditions of soil water content status and environmental factors, the TPA occur time will be advance or lag, which is generally in the range of 8:00~15:00. An acoustic emission event maybe produces several UAEs counts, while the UAEs counts have a correspondence with the UAEs signal strength. It is better to use UAEs technique to diagnose the plant water status and carry out automatic and precise irrigation for the plant and to improve the effect of Water-saving irrigation.
Design of Highway Construction Mixing Materials Ratio Based on Genetic Algorithm
Authors: Li Li Ping , Xu Guang Li , Lu Xiao Li
Published: August 2013

The manual work or Excel based material mixing ratio method has low computer application level and lays high computer capacity on design construction workers. It is difficult to obtain the most optimal technical and economic program from a number of optional programs. The paper built mathematical model of materials mixing ratio based on genetic and identified constraint conditions. Data pre-processing was performed according to the constructed model. According to specific circus of material mixing ratio calculation, the fitness function and various operators were designed and parameters of model were also configured. At the same time of meeting requirements of project quality, multiple target optimizations were considered to give new model and constraints. The highway construction mixing materials ratio calculation based on genetic algorithm achieves expected goal and improve accuracy and efficiency of operations.
Numerical Method of Control Object Identification and Models Robustness Property Maintenance
Authors: Goncharov Valery , Liepinsh Andrey , Rudnitskiy Vladislav
Published: August 2013

In this paper the Real Interpolation Method is offered for the solution of systems Identification problem. The Real Interpolation Method allows to create a sufficiently cost-effective algorithmic basis and to solve all complex of Identification problems. It is based on use of a special case of the Laplace transformation, when the complex variable s =δ + jω is degenerated to real value δ.
The Analysis of the Deep Sea Geomagnetic Measurement Platform Rotation's Impact on the Measurement Results
Authors: Wang Dan , Chi Cheng , Chen Wei Zhen
Published: August 2013

The deep sea magnetic field detection is influenced by the environment of marine and the platform, the influence of the platform is mainly caused by platform rotation. The variation of the geomagnetic fields three-components caused by different directions of the platform rotation are compared by using the World Magnetic Model WMM2010.The results show that the changes of the three-components of the Earth's magnetic field caused by the platform rotation can not be ignored. So the measured results of the deep sea geomagnetic field detection should be compensated. The conclusion can be used for automatic correction of the deep sea magnetic field observation platform.
An Optimal MPPT Algorithm for Wind Turbine Based on Fuzzy Control
Authors: Wang Hong Ling , Wang Wu
Published: August 2013

Traditional MPPT control strategy for variable speed wind turbine was dependent on turbines parameters, the algorithm was difficulty in realize system. A new MPPT based on fuzzy control was presented to improve the efficiency of wind power generation system. This MPPT control strategy adjusts the proportion coefficient of power curve according to the operation states and change perturb step by power characteristic point slop, the power characteristic of wind turbine was analyzed and the strategy of dynamic power curve tracking mode was described, with fuzzy controller designed for this MPPT tracking, the tracking speed was improved, the oscillation around MPP was reduced, the control performance confirmed by MATLAB simulation.
Simulation and Visual Operation: IT Application on Container Terminal Production Logistics System
Authors: Zhong Wei Zhu , Xi Ling Ling , Wang Ya Ping
Published: August 2013

This paper introduces a solution to process control and visualized management system of container terminal. Some advanced technologies, such as GIS, GPS, WLAN, DLP screen etc, are integrated into the Container Terminal Production Logistics System in the solution. Another innovation is the auto-lock equipment fixed on RTG. IT application on container terminal, which includes accurate positioning, dynamic tracking, process controlling, distance operating, and this solution is able to effectively avoid the drivers operational misplay.
Application of Fuzzy Analytic Hierarchy Process in Selection of Electrical Heat Tracing Elements in Oil Pipelines
Authors: Zhao Xiao Gang , Zhou Yi , Zhao Jian Yu
Published: August 2013

The Fuzzy Analytic Hierarchy Process (FAHP), based on the combination of Fuzzy Comprehensive Evaluation and AHP, is introduced in this paper and C# language is proposed to program its mathematical model. Moreover, such program is applied in the actual selection of the electrical heat tracing elements in oil pipeline system. The application shows that it is scientific, reliable, accurate, simple and rapid, which makes it suitable for other evaluations.
Application of Differential Evolution Wavelet Neural Networks for State Recognition of Tool Wear
Authors: Wang Xiao Yun
Published: August 2013

Tool wear monitor is one of the critical issue in industry, accurate prediction of tool life can guarantee surface quality, the new method of tool wear stated recognition was proposed with application of wavelet neural networks (WNN). An application of differential evolution (DE) algorithm was introduced to training artificial neural networks. The three layer wavelet neural network was constructed and optimized with differential evolution algorithm. Cutting force and cutting noise was monitored and the signal was processed as training samples for wavelet neural networks. Simulation with BPNN, WNN and DEWNN to show the new method can avoid normal neural networks with convergence quality and enhance learning speed, also the diagnosis precision and efficiency was improved.
Analytic Solution to a Virus Infection Model
Authors: Xu Liang , Xu Sha
Published: August 2013

A functional analytic method was developed by E.K.Ifantis in 1987 to prove that certain non-linear ordinary differential equations (ODEs) have a unique power series solution which converges absolutely in a specified disc of the complex plane. In this paper, we first applied this method to certain systems of two non-linear ordinary differential equations. We proved that the power series solutions can be determined by some recurrence relations which depend on the parameters of the equations and the initial conditions. Then, we found a method to extend the range of the converge bound. At last, we applied the functional analytic method to the resistant virus infection model to obtain a power series solution and compared our solution with the numerical solution obtained by the Runge-Kutta method using the software Matlab (Version 7.0.1).
Research on Reginal Agricultural Information Technology System Construction - Take Shandong Province as Example
Authors: Zhou Zhi Xia
Published: August 2013

Agricultural information technology, with the core of wide usage of information and information technology, is the important feature of modern agriculture, and has a strong infiltrating and leading role. The construction of regional agricultural information technology, has a positive meaning to optimize allocation of regional agricultural resources, and form regional agricultural information technology with regional characteristics and full functions. Based on analyzing the status quo of agricultural information technology in Shandong Province, this thesis constructed the regional agricultural information technology system from the view of cluster network, which mainly included agricultural Information technology Network System, Information technology Resources, agricultural expert decision-support system, and agricultural information technology service system. Upon constructing and analyzing these systems, it proposed the policy recommendations for promoting regional agricultural information technology development.
Energy-Aware Chaotic Communication in Wireless Sensor Network
Authors: Dutta Raju , Gupta Shishir , Das Mukul K.
Published: August 2013

A challenging task in wireless sensor network (WSN) is to deliver authentic data between source nodes and sink nodes. The collision or dead lock occurs when two or more close nodes are attempted to send data at the same time to the others node. To avoid such dead lock situation in the network we propose a nonlinear mathematical model. The effect of nonlinearity often renders a periodic solution unstable for certain parametric choices even a very small change in initial conditions can lead to different result in chaotic systems which appears to exhibit chaos for a range of parametric values when long time behavior studied. The local stability conditions for the system have been discussed and analyzed. Numerically simulations have been carried out to study the complex behavior of the system for reasonable ranges of parameters in WSN.
A Design of High Speed Data Acquisition and Storage System
Authors: Li Yun Peng
Published: August 2013

This article focuses on research and implementation of a kind of solid storage system that is based on NAND flash which can store the data with high speed and huge capacity. A design with quad 1.25Gsps ADC and flash storage array with 1TB is demonstrated in the paper. The design is applied widely in many fields such as radar, communication and speech recognition. The detail of hardware development is also introduced in the thesis. In addition, a method is discussed to approve the reading and writing bandwidth by parallel operations on multiple pieces of flash. By using the method, the data bandwidth is arrived 6GB/S.
Numerical Simulation of Turbulent Transport and Structures in Temporally Developing Plane Mixing Layers
Authors: Natarajan Thangam
Published: August 2013

The investigation on the sensitivity of the flows to the initial conditions was carried with varying grid resolutions, turbulence models and perturbations. The Direct Numerical Simulation study of Pantano and Sarkar [1] was taken as the reference study and the computational model used in this study was built with a similar configuration of theirs except for the perturbations used. Important results were arrived pertaining to the effect of initial conditions on the turbulent properties and the turbulent structures of the flow.
Finite Element Investigation of Stress Intensity Factors of Multiple Semi-Elliptical Surface Cracks in Solid Shaft
Authors: Bedare Amit R. , Bhat Sunil
Published: August 2013

Fatigue cracks nucleate at the surface of the shaft operating under cyclic load. These cracks then grow into semi-elliptical shapes while extending into the shaft. The paper presents numerical estimation of stress intensity factor (SIF) of such cracks in circular solid shaft when subjected to bending and twisting loads in elastic conditions. The finite element model is first validated with the help of results reported elsewhere for a single surface crack. Later on, multiple coplanar surface cracks are modeled and the effect of the number of cracks and the distance between them on SIF of the main crack is investigated. The results are in line with the expectations.Nomenclature
Parametric Studies on Weld Penetration on Plate of Aluminium Alloy 6061-T6 Using FEM Simulation
Authors: Sajeeb A.M.
Published: August 2013

Tremendous efforts were made in the last couple of decades showing remarkable development in new welding technologies for defect free structures capable of excellent in-service thermal and structural load bearing features. The weld penetration plays an important role in weld induced imperfections and transient temperature distributions followed by transient and residual stress fields. This paper therefore, presents the investigation on the finite element analysis using COMSOL Multiphysics and MATLAB with moving heat sources, temperature dependent material properties, and transient heat transfer and the experimental study by thermogrphy method to the analysis of arc welded plates of Al.alloy 6061-T6 and shows a good co-relation and also close agreement to the previously published literature for temperature distribution. The effect of process parameters viz., welding speed, arc current and standoff distance on weld penetration also has been studied.