bluuebunny/crossref_metadata_2025 huggingface dataset:
Application of Frequency-Domain Blind Deconvolution in Mechanical Fault Detection
Authors: Pan Nan , Xing Wu , Chi Yi Lin , Chang Liu , Liu Xiao Qin
Published: October 2011

On the basis of summing up the Frequency-Domain Blind Deconvolution (FDBD), a method combine Complex-Domain FastICA algorithm and amplitude correlation was proposed to extract the typical defect signals from mechanical equipment. The application in combined failure rolling bearing acceleration signals demonstrate that, comparing with the existing Time-Domain Blind Signal Processing methods, FDBD has more advantages and better prospects in mechanical fault detection.
Delay-Dependent Non-Fragile Robust H∞ Control for Switched Systems with Multiple Time Delays
Authors: Zhang Ni , Fu Mei Chun , Zou Tao
Published: October 2011

The non-fragile robust H∞ control problem is investigated for the uncertain switched discrete time systems with multiple state and input time delays. As the system and controller parameters are polytopically uncertain, the delay-dependent sufficient conditions for the existence of the non-fragile robust H∞ controller via state feedback are presented for the systems based on the multiple Lyapunov functions and state dependent switching rules. By using the cone complementarity linearization algorithm, the nonlinear matrix inequalities relevant to the controller design can be transformed into the nonlinear programming problems constrained by the linear matrices. The simulation results show the effectiveness of the controller design method.
Temperature Rise Presentation of Motor of Electric Automobile
Authors: Meng Shu , Zuo Shu Guang , Ma Cong Gan , Zhang Fan Hui , Sun Qing
Published: October 2011

With the small-sized motor power density becomes bigger and bigger, and it carries high electromagnetic loads, causing its thermal load to be higher and higher. So temperature should be considered when small-sized motor is designed. Temperature rise has a bad effect on the motor of the electric automobile, in order to reduce the effect, it lists the reasons causing motor temperature rise and summarize calculation methods, and then make analyses about motor output characteristics influenced by the temperature, what’s more, summarize the monitoring and cooling measures, finally put forward challenges and research direction about the motor of the electric automobile with distributed drive.
Non-Isothermal Simulation of Melting Process in Twin Screw Extruder Based on Two Typical Screw Configurations
Authors: Liang Chang , Luo Bing , Wang Kui Sheng
Published: October 2011

In this study, heat transfer and melting process in a co-rotating twin screw extruder are studied based on two typical screw configurations, screw element and kneading blocks staggered 45°. In order to estimate the melting ability of two configurations quantitatively, FEM software, FLUENT is adopted to simulate the cases. It could be concluded that kneading blocks have higher temperature rise and more liquid fraction than screw element, and it takes less time and less distance for kneading blocks to finish melting. Simulation results also show that kneading blocks have more viscous dissipation than screw element. Therefore, we can come to the conclusion that the kneading blocks are more suitable for the melting zone of co-rotating twin screw extruders.
Multi-Axial Fatigue Life Model Evaluation and Life Prediction for Turbine Disk
Authors: Zhang Jun Hong , Lv Feng , Ma Wen Peng
Published: October 2011

Multi-axial low cycle fatigue was the main failure mode of turbine disk. Critical plane approach was an idea method for the prediction of multi-axial fatigue life. A lot of models based on critical plane approach have been put forward, but there is not a universal prediction model. In order to find a model for turbine disk, linear heteroscedastic regression analysis of the standard low cycle fatigue data was carried out to obtained fatigue parameters. After verifying the accuracy of the finite element model, the stress and strain history of the danger point was obtained based on elastic-plastic finite element analysis. The critical plane and the damage of it was found by the method of coordinate transformation. The fatigue life of turbine disk was estimated by different models, and the results were quite different. SWT-Bannantine model was more suitable for the turbine disk.
Modeling and Simulation of the Dynamics of the Milling of Ball End Milling
Authors: Sun Meng Qin
Published: October 2011

A dynamic modal of the milling of ball end milling is presented for the simulation and analyzing the influence of the milling parameters on milling in order to avoid the vibration. The milling cutter and constrains are simplified to be a system with the two modes of vibration, the modal is developed considering effective cutting area of the cutting edge and regenerative effect, which directly reflects the cutter-in and the cutter-out. The mode testing and identifying determine the equation coefficients. It is found that reducing the milling depth can improve the stability and avoid self-excited vibration milling when the depth less than the critical milling depth, the frequency of the milling system will change while changing the rotate speed of the spindle, the self-excited is prone to occur when the frequency is close to the natural frequency. The results of simulation are benefit of the milling and optimal design of the parallel machine tools.
Laser Navigation System Applied to Weeding Robot
Authors: Chen Zu Jue , Shan Kai Li , Guo Qiu Yue
Published: October 2011

A laser navigation system is designed to guide the weeding robot，so that the robot can complete the weeding work according to the fixed direction. The laser launching module is fastened in the guiding destination, including laser modulation circuit and a laser source. There is a photoelectricity detector in the front of the weeding robot, composing of photocells array and multichannel gathering circuit. Laser launching device communicates with the robot by wireless send-receive module. The photoelectricity detector detects the position of the light spot when the laser coming from the laser launching device shines photoelectricity detector, then the ARM can calculate for the robot’s position information which will guide the robot moving straightly to the destination automatically.
Analysis and Optimization of Flow Pattern in Inlet Passage of Pumping Station
Authors: Bo Yuan , Feng Wei Min , Liu Mei Qing , Li Qiu Wei
Published: October 2011

Compared RNG and Realizable model with experiment results in numerical simulation in inlet passage，conclusion Realizable k-e model is better reasonable in simulation can be pertained. In order to obtain ideal flow pattern ,Realizable k-e model could be using to simulate the passage and analyze flow pattern. Based on the simulation passage configuration can be modified to pursue ideal flow pattern, which can result in ideal inlet of pump and improve pump operating condition, vibration and noise in pumping station. Inlet passage flow pattern can be modified by using triangle piers,comparing different configuration can obtain the ideal results.
Intelligent Information Flow Based Real-Time Monitoring System of Thermal Power Plant
Authors: Liu Ya Jin , Guo Jiang , Gu Kai Kai
Published: October 2011

Aiming at the existing problems of the monitoring systems of most of the thermal power plants in China, an intelligent information flow based real-time monitoring system of thermal power plant (RT-MSTPP) is proposed. RT-MSTPP is based on the role-based access control (RBAC) model to control different users of business model and the data access, and then realizes the intelligent controlling of the information flow. By using RT-MSTPP, the real-time data of the central equipment in the plant is acquired, their operating state is evaluated and the inchoate fault is predicted. The operating results show that the management of the plant has been improved and the inchoate fault of key equipment can be detected and preliminarily diagnosed.
Direct Torque Control of PMSM Based on Variable Parameter PI and Fuzzy Control
Authors: Zhou La Wu , Shi Shu Qi
Published: October 2011

This paper discusses that conventional direct torque control (DTC) system of permanent magnet synchronous motor (PMSM) exists in the stator flux linkage and electromagnetic torque ripple faults, and puts forward a method using variable parameter PI controller and fuzzy controller respectively used to replace PI speed regulator and hysteresis comparator of the conventional direct torque control and constructs a new direct torque control system of permanent magnet synchronous motor. The experiment results showed that the improved system has good dynamic and static performance, less flux and torque ripple．
Local Stability and Hopf Bifurcation Analysis of the Arneodo’s System
Authors: Liu Yi Jing , Li Zhi Shu , Cai Xiao Mei , Ye Ya Lan
Published: October 2011

The chaotic behaviors of the Arneodo’s system are investigated in this paper. Based on the Arneodo's system characteristic equation, the equilibria of the system and the conditions of Hopf bifurcations are obtained, which shows that Hopf bifurcations occur in this system. Then using the normal form theory, we give the explicit formulas which determine the stability of bifurcating periodic solutions and the direction of the Hopf bifurcation. Finally, some numerical examples are employed to demonstrate the effectiveness of the theoretical analysis.
Research of Power Quality Monitoring System Based on LabVIEW
Authors: Gong Shu Qiu , Liu Jin Mei , Cui Li Yan
Published: October 2011

With the analysis of traditional power quality monitor system, this paper introduces the system built by virtual instrument technology. From the power quality indicators and the measuring principles, we designed a data acquisition hardware based on the USB bus and developed the monitoring system applications using LabVIEW software. Comparing with conventional power quality monitoring system, the system overcomes the weaknesses of huge analog test devices. In this system, the intuitive interface makes operation simple with rapid response and small errors. In addition, statements and automatic alarm function is added to the software programming, which will be a great practical significance of the realization of automated monitoring.
The Research on Turning Operation of Varied Diameter Slender Shaft
Authors: Yang Lin , Wang Peng , Ren Zhong Wei , Fang Fang , Li Yan
Published: October 2011

By analysing the processing characteristics of varied diameter slender shaft parts, and according to the basic vibration theory of slender shaft, a production machine is designed,moreover, a solution with flexible hydraulic follower rest and elastic tailstock is adopted creatively. Experimental results show that this machine tools can effectively improve radial dimensional accuracy,surface quality and production efficiency of the varied diameter slender shaft parts and it has a wide range of engineering significance.
Paleo-Formation Pressure in Storage Layer and its Influence on Hydrocarbon Migration in Dongying Depression
Authors: Jiang Su Hua , Song Chuan Hui , Wang Zhi Ying , Zhou Hai Ting
Published: October 2011

The study of storage layer paleo-pressure in hydrocarbon accumulation period reveals the oil migration direction in Dongying depression. By using of stratum back-stripping method and porosity evolutionary function, the paleo-depth and paleo-porosity of storage layer during Ed, Ng and Nm periods are restored firstly, then the paleo-formation pressure is further recovered by the help of Fillippone formula and time-average equation. The study shows that pressure coefficient is increasing gradually over the 3 periods and overpressure distribution is due to the opening faults. Relations between paleo-pressure and hydrocarbon migration have been analyzed to deduce oil migration direction in storage layer.
Implementation of UMTS Protocol CC Sublayer Based on WinCE Embedded System
Authors: Gao Lin , Lv Jing Gang
Published: October 2011

In the paper, a plan based on WinCE is proposed to implement the UMTS CC protocol in the circumstance of system restricted by hardware resource. In the plan, we create call connection (CC) thread, which implements state transfer according to primitives. In order to realize the communication of primitives withmessages, the paper applies the way of WinCE message queue, with WinCE memory managing in a dynamic way which can increase the efficiency of memory effectively. In programming, mutex is applied so as to construct and synchronize the threads. Also, function pointer array is used in realizing FSM, which can make programming code more efficient. In the paper, the principle of WinCE is discussed, and also the key code in realization is analyzed. The test proves that the design has the quality of programming efficiently with good real time ability.
Core Technologies Analysis for End-Hopping System
Authors: Zhao Chun Lei , Lin Kai , Weng Chen , Jia Chun Fu
Published: October 2011

End-hopping is a technique proposed in the study of active defense in network security. In this paper, core technology analysis is made to the conception of “End-hopping” based on the previous research of our group. And the formal description is put forward. Methods are discussed and comparative analysis is made to implement End-hopping for active defense.
Numerical Study on Flow Characteristics in a Stirring Vessel
Authors: Liang Ru Quan , Ji Jun Hong , Yan Fu Sheng , He Ji Cheng
Published: October 2011

In order to improve the desulphurization efficiency of KR mixing method in the process of molten iron refining, the method of CFD was used to analyze the flow field in a stirring vessel. The Fluent software was adopted to simulate and analyze the internal flow rule in a 3D stirring vessel with the method of multiple reference frame approach, and the corresponding models of Euler two-phase flow fluid model and standard k-ε turbulence model were used. By comparing with the experimental result, the influence of important parameters of agitator on internal flow field in the stirring vessel, such as rotational velocity, immersion depth and impeller type was discussed, and the flow structure was analyzed as well.
The Key Technology of Virtual Reality System Based on Panoramic View
Authors: Ling Yang , Yong Cheng , Cheng Yun
Published: October 2011

Virtual reality technology is the cutting-edge subject of current computer technology and research focus. This paper mainly research the key technologies of virtual reality system based on the panoramic view, including image acquisition, correction, splicing, fusion, re-projection panoramic images such as a set of system solutions. In this paper proposed rough match based Fourier transform and exact match based edge gradient-feature, which can mosaic the two matching images, to save calculation time and improve speed.
Energy and Environmental Scenario Analysis for Residential Sector Based on LEAP
Authors: Xu Guang Yin , Qin Wei Feng , Ti Shu Guang , Xu Yu Chen
Published: October 2011

To assess the energy demand and environment effect on residential sector, a bottom-up LEAP Henan model was developed to simulate three different scenarios from 2005 to 2030. In this paper, by taking Henan Province as an example, the simulation results showed that the implementation of policies and technologies to promote the degree of intensity of energy demand and utilization had a great impact on the energy consumption structure, and the greatest difference in energy demand in three different scenarios reached 9.8Mtce, and the CO2 emission produced by direct energy consumption from end users in three different scenarios had a downward trend.
Cellular Pattern Evolution of Deflagration-to-Detonation Transition in Square Detonation Tube
Authors: Zhang Peng Gang , He Xiao Min , Wang Qian
Published: October 2011

This paper presents recent results of an experimental investigation on Deflagration to Detonation Transition (DDT) with H2/air and C2H2/air mixtures in 60mm×60mm square detonation tube. The entire process of DDT is demonstrated by cellular patterns and the analysis is mainly based on their evolution.The pressure transducers and ion-probes were utilized to get the pressure and flame history in the tube respectively, and the corresponding cellular patterns are recorded on soot foils along cover board with 60mm×1380mm.Results show that overdriven detonation appears only once and several blast appear in DDT.Cellular patterns show that severaltwistable linesappear at the obstacle exit neighborhood area , while regular cell takes place after the final twistable line.Details of the cellular pattern indicate that from the early stage to the end of regular cell, the detonation wave sequentially experiences impactive area, abundant secondary cells, secondary cells expanding, local explosive, fine secondary cells, regular cell.
L2-Norm Optimal Trajectory Planning for Mobile Ground Vehicles in a Dynamically Changing Environment with both “Hard” and “Soft” Obstacles
Authors: Yang Jian , Dong Mi
Published: October 2011

In this paper, the real-time trajectory planning problem is considered for a differential vehicles in a dynamically changing operational environment. Some obstacles in the environment are not known apriori, they are either static or moving, and classified to two types: “hard” obstacles that must be avoided, and “soft” obstacles that can be run over/through. The proposed method presents trajectories, satisfying boundary conditions and vehicle’s kinematic model, in terms of polynomials with one design parameter. With a cost function ofL2norm, an optimal feasible trajectory is analytically solved for “hard” obstacles. By relaxing the optimal solution, “soft” obstacles are prioritized to be bypassed or overcome. The proposed method offers an automatic and systematic way of handling obstacles.The simulation is used to illustrate the proposed algorithm.
Man-Machine Cooperated Dynamic Schedule Orienting Disturbance in Steelmaking
Authors: Zhao Ning , Dong Shao Hua
Published: October 2011

In order to solve dynamic schedule problem brought by disturbance in steelmaking, the disturbance and corresponding method are classified. Man-machine cooperated method are brought out. Gantt chart is used to help man-machine cooperating, algorithm of conflict adjusting is used to ensure validity of dynamic schedule. Based all the work above, Man-machine schedule system is built in the end.
Automatic Airport Extraction Based on Improved Fuzzy Enhancement
Authors: Pan Li , Liu Zhao Xian
Published: October 2011

We put forward a process of automatic airport extraction based on the characteristics of high resolution remote sensing images. First, through image enhancement algorithm, the contrast of target and background is enhanced. Second, we can extract the possible airport through the algorithms of Ostu segmentation, mathematical morphology corrosion and region-labeling. Finally, combined with the geometric structure of the runway, the airfield runway can be extracted through the algorithms of edge detection, progressive probability Hough transform and line connection. Then the possible airport can be verified by the extracted airfield runway. In the process, we proposed an improved fuzzy enhancement algorithm for image enhancement. This algorithm has good effect on the image enhancement and has strong robustness. The results of the experiment indicate that the process of automatic airport extraction is robust and has the advantages of high speed and degree of automation.
Elevator Brake Release Automatic Control System
Authors: Zhang De Min , Liang Xue Hui
Published: October 2011

The brake release electrical control board is a very important element of the elevator rescue operation control system. The brake release board provides a power supply to operate an elevator brake by a battery in rescue operation mode to allow a motion of a car until the next floor level to release any passengers. The brake release board has some buttons to operate the car and some LED’s to indicate the state of running. There are also some parameters in the board to adjust the operation.
Control of Clutch on DCT during Start Process
Authors: Kong Hui Fang , Li Xiu Ping , Bao Wei
Published: October 2011

Dual Clutch Transmission (DCT) is a new automatic transmission system, which overcomes the shortcomings of power break when shift of the automatic mechanical transmission (AMT) and not only inherit high transmission efficiency and simple structure of AMT, but also inherit small impact of hydraulic, non-power interruption characteristics of automatic transmission (AT). The core and difficulty is the clutch control in the start process, the control targets are not only to ensure the smoothness of the start process and stable operation of the engine, but also to ensure quickness[1].
An Improved Hybrid Discrete Particle Swarm Optimization Algorithm to Solve the TSP Problem
Authors: Xiao Bin , Li Zhao Hui
Published: October 2011

Through investigating the issue of solving the TSP problem by discrete particle swarm optimization algorithm, this study finds a new discrete particle swarm optimization algorithm (NDPSO), which is easy to combine with other algorithm and has fast convergence and high accuracy, by introducing the thought of the greedy algorithm and GA algorithm and refining the discrete particle swarm optimization algorithm. And then the study expands NDPSO by Simulated Annealing algorithm and proposes a hybrid discrete particle swarm optimization algorithm (HDPSO). At last, the experiments prove that these two algorithms both have good convergence, but the HDPSO has a better capacity to find the best solution.
CFD Analysis of Two-Phase Flow in a Solid-Liquid Hydrocyclone
Authors: Feng Ding , Huang Si , Luo Li , Ma Wei Guo
Published: October 2011

This paper presents a performance analysis of a solid-liquid hydrocyclone using Ansys-CFX software. Based on the simulation, the influence of particle volume fraction of feed flow, mean diameter of particles and viscosity of liquid phase on the two-phase flow and separating performance has been investigated for optimizing design.
A High-Speed and High-Precision Compound Algorithm Combining PID with MRAC for a Flow Control System Based on the Lyapunov Approach
Authors: Zhao Liang , Wang Bin Bin , Xu Fei Liang
Published: October 2011

For a class of non-linear,time-delay and time-varying control systems with unknown interference,a compound algorithm combining classical PID with model reference adaptive control (MRAC) based on the Lyapunov approach is proposed in this paper.The compound algorithm is employed to control flow in automobile radiator’s water circulation system.The simulation and practical application show that the compound algorithm could ensure high speed response,high precision,stabilization and rubustness more effectively compared with conventional control algorithm.The algorithm is practical and worthy to be used.
Numerical Solution of 2D Flow in Sharply Curved Channel Using a Local Coordinate System
Authors: Su B.L. , Wei W.L.
Published: October 2011

This paper is concerned with a new numerical method of two-dimensional flow. The governing system of differential equations is transformed into an equivalent system applied over a square-grid network in order to overcome the difficulties and inaccuracies associated with the determination of characteristics near the flow boundaries. The MacCormack two-step explicit scheme with second-order accuracy is used for the solution of the transformed system of equations. The present numerical model has been used to numerically compute flow in sharply curved channel
Research on the Location of Fire Station Based on GIS and GA
Authors: Zhang Wei , Jiang Jun Cheng
Published: October 2011

To locate the fire station under a prescribed period is of strategic significance in the urban fire planning. On the .Net platform, integrate the Genetic Algorithm and Geographic Information System (GIS) via the C# language to resolve the complicated issue of the spatial site selection. The GIS spatial data will be imported to the module first. Then on the basis of both the spatial analysis feature and the network analysis feature of GIS, calculate the individual’s fitness in the process of the genetic evolution. The Conventional coding approach is generally utilized to optimize the small-scale data set. However, to meet the search requirements in the massive spatial data of GIS, the object oriented coding approach is designed in the module. It is indicated that the entire module is able to resolve the site selection issue of the urban fire station properly, which meets the quick response’s requirements.
A Novel Arc-Shaped Printed Antenna for WLAN Applications
Authors: Pei Jing , Wang An Guo , Leng Wen
Published: October 2011

In this paper, a low profile printed antenna with dual-band operation for wireless localarea network (WLAN) applications is presented. It provides two separate impedance bandwidths of0.49GHz (2.3-2.79GHz) and 2.22GHz (4.92-7.14GHz). The proposed microstrip-fed antennaconsists of two arc-shaped strips with a nipped stub and a defected ground plane. The proposedantenna occupies a small size (40mm×25mm×1.59mm) and is fabricated and measured. Good omnidirectionalradiation patterns and enough gains across the operation bands are obtained. Thesimulated results are in good agreement with the measured. The effects of the key structureparameters on the antenna performances are also analyzed and presented.
Resolution Improvement with Two-Dimensional Digital Focusing Method in Optical Coherence Tomography
Authors: Lei Yong , Huang Rui , Chen Xiao Dong , Wang Yi , Yu Dao Yin
Published: October 2011

This paper presents a two-dimensional (2D) digital focusing method to alleviate the compromise between the resolution and depth of field (DOF) in spectral domain optical coherence tomography (SDOCT). A scalar diffraction model is developed to simulate the wave propagation process from out-of-focus scatterers and the inverse scattering problem is solved. The wavenumber domain algorithm is applied to improve the transverse resolution, and the matched filter to improve the axial resolution. Image reconstruction with spatially invariant resolution can be achieved. The 2D imaging experimental results of fresh pig liver prove the effectiveness of the proposed method.
Design and Experimental Test of Fiber Bragg Grating Rotate Speed Sensor Elastomer
Authors: Wei Li , Hu Ting Ting , Tan Yue Gang
Published: October 2011

This paper presents a rotate speed sensor using fiber Bragg grating (FBG) as sensitive component and constant strength cantilever structure as elastomer. The sensor is applied in large rotating experimental platform testing changes of impeller rotate speed through the vibration of the sensor's elastomer. The center reflection wavelength of FBG enters fiber grating demodulation device sm130, where light signal is demodulated. Experimental results demonstrate that the sensor can test the rotate speed of rotating machine repeatedly and sensitively. In addition, the sensor's easy theory and portable structure lay the foundation for further study on shaft torsional vibration detection of rotating machinery.
Characteristics of Anaerobic Co-Digestion of Corn Straw and Cabbage for Biogas Production
Authors: Zhao Yuan Fang , Yang Shi Guan , Li Ji Hong , He Yong Mei , Lu Qiang , Dong Chang Qing
Published: October 2011

In order to study characteristics of anaerobic co-digestion of corn straw and cabbage, the experiment was performed with corn straw to cabbage (S:C) of 4:1, 6:1 and 10:1 based on total solids (TS) at 35±1°C at initial TS of 8%. The effects of co-digestion on pH, volatile fatty acid (VFA), and biogas yield were examined. Results showed that the S:C of 4:1 was optimal with accumulative biogas yield of 334.53mL/gTS compared with S:C of 6:1 and 10:1 with accumulative biogas yield of 289.31mL/gTS and 311.37 mL/gTS, respectively. This should be attributed to the high VFA concentration achieved by S:C of 4:1.
Research on Sensor Data Fusion Technology in Vehicle Weighing-In-Motion
Authors: Li Lian , Zhai Li Xia
Published: October 2011

In view of the structure and characteristics of the vehicle dynamic weighing system, this paper uses the sensor data fusion technology to detect the non-target parameters which impact the feature of pressure sensor, such as operating temperature, the speed of vehicles and so on. In addition, we can reduce the cross-sensitivity of these non-target parameters through applying the fusion algorithm. Finally, through the experiments this paper verified the effectiveness of this fusion algorithm and improved the detection accuracy of the dynamic weighing system in some degree.
Analysis on the Influence of Random Vibration on MEMS Gyro Precision and Error Compensation
Authors: Hao Xiang Yu , Li Ming , Han Xue Feng , Jia Hong Guang
Published: October 2011

In order to improve its precision in dynamic environment, a Kalman filter was designed. Firstly, two sets of random drift data of MEMS gyro were respectively analysed, and it was found that the variance of random drift under random vibration significantly increased and its mean also changed. Then calculation results show that attitude angle error under random vibration is 2.6°, while in the static test it is 0.25°. Analysis on the characteristics of random drift was carried out, and it is found that it can be treated as stable, normally distributed random signal. Finally, a corresponding Kalman filter was designed. The results indicated that after filtering the variance of random drift is reduced to 0.0282, 26.4% of pre-filtering and the attitude angle error is reduced to 1.5°, 57.7% of pre-filtering. The above method can effectively compensate for the attitude angle error of MEMS gyro caused by random vibration. This study can be a reference to the application of low-cost MEMS gyro in aircraft navigation.
Study and Analysis a Powerful Debug Method for Smart Mobile Systems
Authors: Yuan Jian Guo , Gu Sheng
Published: October 2011

When dealing with such complex systems such as the software package of a smart mobile phone, it is necessary to apply powerful methods to detect and report errors when they occur. This paper probes and analyzes a powerful debug method called trap and exception handling, which is supported by the ARM platforms. The method can easily capture some valuable debug information. When a fatal error occurs during runtime or system detects an abnormal, a trap or an exception shall be logged and stored in the non-volatile random access memory (NVRAM). The information must be enough and easy for engineer to analyze the software error.
The Modeling of Thread-Rolling Die-Plates Based on the “Design Table” Functions in CAD/CAE/CAM
Authors: Jiang Yong Jun
Published: October 2011

This paper has successfully developed an integrated automatic taper-tipped die-plates construction system via linking the design table functions in Microsoft Excel underlying SolidWorks CAD software. The developed system can be used to generate 3D thread-rolling die-plate geometry in STL format for further screw thread-rolling process FEA simulations by using DEFORM 3D software. This has concluded that the quality of a taper-tipped screw depends mostly on the die-plate design at the pre-rolling portion.
A New Method to Reduce the Interconnection Transients of Induction Generators
Authors: Zhu Ke , Lu Xiao Hui , Zhang Bo
Published: October 2011

This paper presents a novel method to reduce the inrush currents produced by interconnecting induction generators. The method is based on the sequential energization of the contactors and a grounding resistor connected at the neutral point of a wye-connected stator. Analytical developments are presented, which permit to determine the optimum value of the neutral resistor directly. Theoretical and simulation analysis show that the proposed method can be almost as effective as the traditional three series resistor method. The proposed method requires only one resistor and one bypass contactor and is therefore more cost-effective than the traditional methods.
Load Rotational Moment and Power of Centrifuges with Rotational Arms
Authors: Yin Yi Hui , Liu Yuan Dong , Wang Xin Lun
Published: October 2011

The load rotational moment and power of a centrifuge with rotational arms (CWRA) consist of aerodynamic, inertial and frictional rotational moments and related powers, respectively. The chosen electromotor based on previous calculations cannot accurately provide proper moment and power for dynamic CWRAs. In this paper, the maximum load rotational moment and maximum load power of a CWRA were formulated, a method to calculate the rating power of its driving electromotor was suggested, and an analytical computational example was performed. The results show that the present method is much more accurate than previous ones.
Nonlinear Dynamics of a Slender Flexible Cylinder in Axial Flow
Authors: Jin Ji Duo , Li N. , Qin Zhao Hong
Published: October 2011

The stability and nonlinear dynamics are studied for a slender flexible cylinder subjected to axial flow. A nonlinear model is presented, based on the corresponding linear equation of motion, for dynamics of the cylinder supported at both ends. The nonlinear terms considered here are the quadratic viscous force and the additional axial force induced by the lateral motions of the cylinder. Using two-mode discretized equation, numerical simulations are carried out for the dynamical behavior of the cylinder to explain, with this relatively simple nonlinear model, the flutter instability found in experiment. The results of numerical analysis show that at certain value of flow velocity the system loses stability by divergence, and the buckled configuration becomes unstable at higher flow leading to post-divergence flutter. As the flow velocity increases further, the system is restabilized in the buckled configuration prior to another dynamic instability at higher flow.
The Study of Optimization Design of Engine Exhaust Manifold Based on Finite Element Analysis
Authors: Zhang Wei Feng , Yang Ming Huiand , Wen Miao Miao
Published: October 2011

Aim to the exhaust manifold breaking phenomenon which appeared during pedestal experiment of a certain model engine, the main damage resource was detected through the studying and analyzing of exhaust manifold’s dynamic characteristic by means of FEM method. According to the results, one optimization design from both of materials and structure modified was provided. The engineering application and FEM analysis of modified structure show that the optimization design was efficient to deal with such problem.
Effect of Ta2O5 Addition on the Electrical and Physical Properties of Lead-Free 0.98(Na0.5K0.5)NbO3-0.02(Na0.5Bi0.5)TiO3 Piezoelectric Ceramics
Authors: Wang Chun Huy
Published: October 2011

In this paper, the effects of Ta2O5addition on the electrical and physical properties of 0.98(Na0.5K0.5)NbO3-0.02(Na0.5Bi0.5)TiO3were investigated. The 0.98(Na0.5K0.5)NbO3-0.02(Na0.5Bi0.5)TiO3[0.98NKN-0.02NBT] ceramics with the addition of 0~0.5 wt% Ta2O5have been prepared following the conventional mixed oxide process. X-ray diffraction analysis revealed that, during sintering, all of the (Na0.5Bi0.5)TiO3diffuse into the lattice of (Na0.5K0.5)NbO3to form a solid solution, in which a orthorhombic phase with a perovskite structure was found. For 0.98NKN-0.02NBT ceramics by doping 0.1 wt% Ta2O5, the poled dielectric constant (K33T) is 1090. The electromechanical coupling coefficients of the planar modekpand the thickness modektreach 0.39 and 0.48, respectively. Our results show that 0.98NKN-0.02NBT with the addition of 0.1 wt% Ta2O5is a good lead-free piezoelectric ceramic.
Tribological Properties of the Overbased Calcium Sulfonate Complex Greases
Authors: Wen Zhen Zhong , Xia Yan Qiu , Feng Xin
Published: October 2011

The commercial greases for bearing applications should meet the requirements of the severe conditions of use (high load, low friction and low noise etc.). A kind of overbased calcium sulfonate complex greases was evaluated using an UMT-II friction tester, the commercial lithium greases as reference. The morphologies of the worn surfaces were observed using a scanning electron microscope (SEM). The results show that the overbased calcium sulfonate complex greases have stable friction coefficients as low as 0.090-0.094. At the same time, the overbased calcium sulfonate complex greases exhibited higher wear resistance than that of commercial lithium greases.
Temperature Field Analysis on Cooling Stave Material and Stave Body
Authors: Wei Fang , Chang Jiang
Published: October 2011

The cooling stave longevity is the most important factor to affect the blast furnace life. In this paper the cooling stave model was built by use of software ANSYS. With boundary conditions of heat transfer of cooling stave fully taken into account, temperature fields of cooling stave made of different materials are analyzed. The analysis results showed the relationship between the different cooling stave materials and temperature field distribution of stave body. A general method of selecting cooling stave material and structure design for longevity design of cooling stave was developed.
Study on Numerical Simulation Technology Based on ANSYS of Fracture Behavior in Metal Forming Process
Authors: Shi Yan Guo , Yao Bao Jun , Zhang Qing Ling , Mei Xin Hua
Published: October 2011

This title use the ANSYS Secondary Development Technology as platform, developed the user101 element that stable for fracture process simulation, and embedded fracture criterion into ANSYS software. Realized the fracture forecast on metal forming process and verified the simulation results through the experiment.
Aerodynamics Analysis in a Human Vocal Folds Model
Authors: Chen Dong Fan , Gao Xiang , Chen Wei Tao , Han Xing Qian
Published: October 2011

The aerodynamic analysis to human vocal folds owns great significance on understanding the principles of voice production,clinical disease diagnosis and treatment recommendations tovoice patients. This paper provides experimental data on airflow from a fourtimes scaled physical model.The results indicate that the pressure acting on the surface of the vocal cords is changed large partly by the glottal entrance angle and the glottic radius, andbringimportant impact on the glottic airflow field. The study has potential applications on voice rehabilitation, especially the design of glottis reconstruction programs.
Variable Pitch Controller Design Based Swarm Particle Optimizing Clonal Algorithm for Wind Power Generation System
Authors: Wang Qiang , Sun Jian , Xiao Jian Xiu
Published: October 2011

In this paper, a new controller of the pitch angle of the wind turbine is designed based on particle swarm optimizing clonal algorithm(PSOCA), which combined the clonal selection mechanism of the immune system with the evolution equation of particle swarm optimization. The simulation results demonstrate that the proposed controller can efficiently and steady control the output power of the wind power generation system. Compared with the traditional PID controller, the controller has better control performance.
Weigh-in-Motion Data Fitting Based on Least-Squares Method
Authors: Xu Qian Yu , Qin Yu , Li Juan , Zheng Hui Hui , Yang Fa Wu
Published: October 2011

The dynamic weighing technology is multi-domain comprehensive technology, including the mechanics of materials, dynamics, the technology of sensor, the technology of electronic information and so on. Vehicle weigh-in-motion system is a detection system which is used to measure the weight of the moving vehicle. With the development of the transport industry output and commercial trade, Vehicle weigh-in-motion technology is playing a more and more important role. At the same time, the accuracy of the weigh-in-motion data has become the centre of attention. In this paper, use the method of least square and polynomial fitting and the MATLAB mathematical software, by studying and analyzing a mass of weigh-in-motion data，the fitting curve of the vehicle weigh in different speeds is obtained. According the variation law of fitting curve, further improvement need to do in certain standard and weigh carefully as to the true quality when the vehicle is in some speed region.
Motion Control Analysis of the Fruit-Trees Robot
Authors: Yu Jia Ao , Fu Min Cang
Published: October 2011

The article tracks the fruit-trees robot, and analyzes the fruit-trees robot’s dual-motor control system. Based on the speed incremental PID closed-loop control algorithm of the step DC motor, the PID controller’s proportional coefficient, integral coefficient and differential coefficient is concluded. It demonstrates from the stimulations and experiments that the usage of speed incremental PID control do better at the response speed and stability than the open-loop control motor when the robot is run by a straight line on the ground at the 3000rpm.
A Probabilistic Cache Sharing Mechanism for Chip Multiprocessors
Authors: Yan Pei Xiang , Jiang Jiang , Yang Xian Ju , Zhang Min Xuan
Published: October 2011

Capacity sharing is efficient for private L2 caches to utilize cache resources in chip multiprocessors. We propose a probabilistic sharing mechanism using reuse replacement strategy. This mechanism adopts decoupled tag and data arrays, and partitions the data arrays into private and shared regions. Probability is introduced to control the capability of each core to compete shared data resources. We assign high probabilities to cores with stress memory demands and dynamically adjust these probabilities corresponding to the monitored run-time memory demands. Simulation results of PARSEC benchmarks show that our mechanism exceeds conventional LRU managed private cache. Compared with reuse replacement managed private cache without sharing among cores, our mechanism achieves an average L2 miss rate reduction of 8.70%.
Transportation Chance Constrained Model with Fuzzy Parameters
Authors: Yuan Guo Qiang , Meng Ming Qiang , Li Chun Ping
Published: October 2011

This paper presents how credibility theory and chance constrained optimization method can be efﬁciently applied for modelling and solving transportation problem in fuzzy environment. Since the proposed transportation model includes fuzzy variable coefﬁcients deﬁned through possibility distributions with inﬁnite supports, it is inﬁnite-dimensional optimization problem. Therefore, we can not solve directly it by conventional optimization algorithms. To overcome this difﬁculty, we will discuss the approximation of the fuzzy transportation chance constrained problem in this paper, and design a heuristic algorithm, which combines approximation method (AM), neural network (NN) and genetic algorithm (GA) algorithm to solve this transportation chance constrained model. Finally, we present one numerical example to show the feasibility and effectiveness of the proposed method.
A Reverse Driving Control Method for Hydrostatic Mobile Machinery
Authors: Wang Xin , Zhao Rui Ying
Published: October 2011

A reverse driving control method for one type of hydrostatic mobile machinery is devised in this paper. Based on the analysis of dynamics of stopping process, the relationship between engine speed and pump displacement is established. To restrict the peak value of engine overspeed within the region of the allowable value, an offline parameter determination approach complied to the requirements of average stopping deceleration is developed. The online control method using the selected parameter is presented. A flow diagram is given to illustrate the control method.
A Study of Regional Comparison on Productive Efficiency of Logistics Service Industry in China
Authors: Song Ying Jie , Lv Cui Cui
Published: October 2011

This paper, based on the analysis of the innate properties of productive activities of logistics service industry, constructs input and output index based on SUPER-SBM DEA model. The paper empirically selects provincial data of China in 2008, evaluates the score of productive efficiency of logistics service industry in various regions and then explores the approaches to promote productive efficiency according to related slack variables analysis. According to the analysis, the overall efficiency in logistics service industry in China is comparatively low and there is a remarkable feature in its regional distribution. The efficiency in eastern regions is comparatively higher with the western regions following it and that in central regions is the worst. There exists larger input redundancy in the process of developing the logistics service industry. Thus, regional coordination of the logistics service industry should be emphasized and basic infrastructure investment should also be strengthened. Personnel quality should be improved and meanwhile redundancy should be reduced. Marketization degree of logistics service industry should be improved and capital-intensive industry of logistics service industry should be upgraded.
A Discussion of the Design Method of Full Adder Circuit
Authors: Lin Shan , Lin Tao , Liu Zhan Wen
Published: October 2011

A bit full adder is a very important component in the digital system. Design of a full-adder circuit, as an example, by changing its output function expression in the form of expression, use the gates, decoder, multiplexer etc 74 series devices, the eight circuits realization form are given respectively, and briefly analyzed the advantages and disadvantages of the various circuit implementation. The example show that the design of combinational logic circuits has mobility and variety, it could give the instructiveness and the guiding for other design of combinational logic circuits.
A Traffic Control Mechanism Based on Fuzzy Logic
Authors: Liang Bao Juan , Ju Yong Feng
Published: October 2011

with the rapid development of information technology, the control mechanism of traffic is continuous improved towards automatic and intelligent. Traditional pre-setting control method based on data statistical can not meet the complex needs of the current traffic control. Aiming at this issue, we propose traffic control mechanism based on fuzzy logic. The technology real-time gets the situation of traffic according to a series of fuzzy inference rules that is pre-setting to achieve optimal control of the traffic situation. Experiments show that this method not only can improve the passage efficiency of intersection, but also provide more predicted result as well compared to the network-based control methods.
A Fault Diagnosis Approach of Steer-by-Wire System
Authors: Wu Fang Yuan , Kong Feng , Yao Jiang Yun
Published: October 2011

This paper presents an intelligent fault diagnostic approach for a steer-by-wire (SBW) system. A rough set model is utilized to reduce the redundant information. On the base of the reduction, the classifying rules can be extracted. A radical basis function (RBF) neural network optimized by particle swarm optimization (PSO) algorithm is designed to learn the fault rules that are extracted from the reduction of the redundant information. The proposed approach is simulated in MATLAB. Simulation results show that the proposed intelligent fault diagnostic algorithm provides a higher level of diagnostic accuracy than the approach without any optimization.
Analysis of Two ID-Based Key Exchange Protocols
Authors: Wang Wei , Cheng Qing Feng
Published: October 2011

In this paper, we analyze two ID-based authenticated key exchange (AKE) protocols in the eCK model. One is a two-party AKE protocol between members of distinct domains proposed by Xia et al. in 2009. The other is a dynamic group AKE protocol proposed by Xie et al. in 2010. The results of analysis show that both of them are insecure in the eCK model.