bluuebunny/crossref_metadata_2025 huggingface dataset:
Fault Diagnosis Model Based on Support Vector Machine and Genetic Algorithm
Authors: Niu Wei , Wang Guo Qing , Zhai Zheng Jun , Cheng Juan
Published: October 2011

Recently, the dominating difficulty that fault intelligent diagnosis system faces is terrible lack of typical fault samples, which badly prohibits the development of machinery fault intelligent diagnosis. Mainly according to the key problems of support vector machine need to resolve in fault intelligent diagnosis system, this paper makes more systemic and thorough researches in building fault classifiers, parameters optimization of kernel function. A decision directed acyclic graph fault diagnosis classification model based on parameters selected by genetic algorithm is proposed, abbreviated as GDDAG. Finally, GDDAG model is applied to rotor fault system, the testing results demonstrate that this model has very good classification precision and realizes the multi-faults diagnosis.
Servo Motor Control Lifter Systems by Digital PID Control Method
Authors: Yue Ming , Wang Bao Guang
Published: October 2011

Aiming at the wild used tide gauge, a research project has been made. The purpose of the project is to build a standard test equipment which is used for calibration. The principle of the tide gauge is imitating water-level fluctuation of diurnal tides or semi-diurnal tides, based on controlling dynamic water flow which is 10 meters high and 8 tons heavy. This is a national standard test equipment which will be used by Tianjin National oceanic standard measuring center. In this paper, the digital PID control method is used for computerizing servo motor .First, the principle of servo motor control has been discussed, and then PID adjusting theory and method are also introduced. At the same time, software compiled is used to control servo motor. In the end, the corresponding results can be output on the hardware platform. The method above has been proven advisable.
Intelligent Monitoring System of Battery Based on CAN Bus
Authors: Guo Yi Song
Published: October 2011

The intelligent monitoring system of battery with CAN bus is introduced, which is composed of two layer net, the C8051F045 controller is the core of measuring system, the bottom layer is measuring board based on intelligent battery monitor DS2438 fixed on each battery, it measures the battery parameter such as voltage, current and temperature on line, exchanges dates with C8051F045 by the single bus. The top layer is the CAN bus, by which connected the super monitoring compute and C8051F045 controllers. The system can real-time measure battery parameters remotely, forecast accurately the invalid battery according to the comprehensive judgment, and can improve the reliability of the serial battery.
Research on Quality Control Architecture for Multistage Machining Processes in Small Batch Mode
Authors: Wang Yan , Jiang Ping Yu
Published: October 2011

This paper presents a type of architecture of multistage machining processes in small batch mode, named Small-batch Quality Control System (SQCS), through analyzing various process quality control methods. The SQCS integrates complex network, workpiece variation propagation model and process quality prediction. And then, the three key enabling technologies are discussed in detail. Sensor network could be used to acquire real-time quality data, which include workpieces’ physical and dimensional information. Based on the above mentioned ideas, a general model of stage flow in small batch mode is constructed in order to realize process-driven online quality control and improve product machining quality.
Design of Master-Slave Position Controller of Electro-Hydraulic Servo Tele-Robot
Authors: Gong Ming De
Published: October 2011

To eliminate the errors of cylinders’ dynamic output positions of master side for the influence of random disturbance of slave side, master-slave position controller based on disturbance state observer optimal control and robust dynamic compensate PD feedback control algorithm is designed for electro-hydraulic servo tele-robot. A linear quadratic with disturbance observer and a dynamic robust compensator position controller is developed. Experimental results demonstrated the proposed algorithm is availability and showed that the designed controllers both improved position tracking precision for master-slave side and possessed good adaptive ability and robustness in existence of uncertain disturbance, enhanced the operational performance.
Control of Transplanting Seedlings Robot Based on 3-CRR Parallel Mechanism
Authors: Xie Jun , Feng Shi Ji
Published: October 2011

A new 3-CRR parallel mechanism which was complete decoupling for the design of transplanting seedlings had been proposed, and its kinematics was analyzed. The anticipant trajectory had been transformed into generalized location coordinates of driving joint. The intelligent control of the computers within the scope of the work had been completed. In closed-loop control circuit, the improved feed-forward compensation fuzzy PID control principle was adopted. By detecting encoder’s feedback signals, continuous trajectory interpolation had been used to achieve the precise control of the robot joints. An intelligent self-searching transplanting robot was developed, the robot automatically calculated the coordinates of the roots of seedlings and automatically generated transplanting trajectory in the humanoid intelligent way. Modular design and object-oriented programming methods were mainly used in the control system of transplanting seedlings robot, and it was compiled by VC + +6.0.
Overall Performance Evaluation of Wind Power and Micro-CAES Hybrid Electricity-Generation System
Authors: Liu Wen Yi , Xu Gang , Yang Yong Ping
Published: October 2011

Micro-CAES can balance fluctuations in supply and demand of electricity. In this technology, air is compressed with a motor/generator using low cost, off-peak or discarded electricity from wind power and stored underground in caverns or pipes. This pressurized air is released then be burned with gas in a combustor. The hot expanding gases drive a micro-turbo expander and run a motor/generator which, in turn, produces electricity during peak demand periods. By considering the factors including economy, reliability, environment protection, and CO2 emission, a fuzzy overall evaluation model for different power supply mode is proposed. The related calculation and optimization are made. Linking with wind power, the overall performance of micro-CAES is best.
Simulation of Flow in a Rectangular Meandering Channel
Authors: Ma K. , Wei W.L.
Published: October 2011

This paper is concerned with the numerical solution of two-dimensional flows in a rectangular meandering channel. The technique of boundary-fitted coordinate system is used to overcome the difficulties resulting from the complicated shape of natural river boundaries; the method of physical fractional steps is used to solve the partial differential equations in the transformed plane. Comparison between computed and experimental data shows a satisfactory agreement.
Dynamic Modeling and Simulation of 3-d.o.f. Vibration Active Isolation Platform Based on Giant Magnetostrictive Actuators
Authors: Li Jian Qiang , Yang Bin Tang , Meng Guang , Pan Peng Sheng , Yang De Hua
Published: October 2011

A new kind of 3-d.o.f. vibration platform is introduced, which may be used in active vibration control, presion manufacturing, and other precision positioning fields. The platform is mainly comprised of four parts: the top board of the platform, flexure hinges, amplification mechanisms and gaint magnetostrictive actuators (GMAs). Among them, finite element analysis is taken on flexure hinges; the constitutive model of GMA is described. Eventually, the dynamic model of the system is established. According to the model, a simulation system based on SIMULINK is carried out. The simulation results verify the model, and may serve for the active control analysis of the platform system.
Research on Dynamic Friction Compensation of High-Speed Precision Slider
Authors: Hua Sun , Dai Yue Hong , Tang Chuan Sheng
Published: October 2011

. The tracing precision is greatly influenced because of the friction when high-precise linear motor moved in a low speed.Explore the ways of nonlinear friction compensation in a practical angle. A tribology mathematical model has been found based on the viscoplasticity theory and Stribeck friction mathematical model.This paper aims at applying the Stribeck friction mathematical model to linear motor slider system and designing the controller.The controller can be designed by the feed-forward Integral to conduct identification and compensation online, according to the characters of tribology model.the stability of systems has also been analyzed by using Liapunov functions and LaSalle Invariance Principle.As has been demonstrated by the experimental results, the friction compensation of this model has improved the tracing performance of linear motor slider system.
Dynamic Analysis of Split Stirling Engine
Authors: Tang Jing Chun , Zuo Cheng Ji , Li Liang
Published: October 2011

The ordinary differential equations coupling electromagnetic force of dynamics were established for split Stirling engine. The transient displacement vectors of the two pistons were disposed of feedback vectors in numerical computation models of Matlab/Simulink computing environment. Since the total mass of the working fluid remains constant, the instantaneous cyc-pressure was computated by the characteristic gas equation. The differential pressure vector of the expansion space between the compression space was computated by the flow loss in the regenerator. The instantaneous current of generator winding was computated by the balance equation of motional electromotive force. The displacement wave forms was contrast to the expansion piston and the compression piston. In addition, one of the necessary conditions of steady operation was reduced by oscillation theory for split Stirling engine.
The Research on Hadoop and Cloud Computing-Based Mass Data Storage Model of Computation
Authors: Peng Fang , Huang Qing Yun , Qian Zhao Peng
Published: October 2011

Cloud computing as a new business model that allows the user according to their needs using the resource pool which formed by data on a large number of computers. Hadoop, as the distributed software platform is the most widely use of cloud computing. It can run applications on the computer cluster which formed by a large number of low-cost hardware devices, and turn the calculation into data completely then deal with massive data. This article describes the basic framework of Hadoop and the advantages of dealing with massive data, the concept of cloud computing, and research of computing and storage model which base on Hadoop and cloud computing.
Research on Cipher Coprocessor Instruction Level Parallelism Compiler
Authors: Li Hong Yan
Published: October 2011

The important method of studying cipher coprocessor is focus on system architecture of processor in combination with reconfigurable design technique. How to improve performance of cipher coprocessor is important. Based on very long instruction word (VLIW) structure and reconfigurable design technique, specific instruction cipher coprocessor is designed. In this paper, the cipher coprocessor instruction level parallelism compilation technique is studied to enhance the cipher coprocessor performance by increasing the instruction level parallelism.
Research on Software Optimization of Real-Time Processing System Based on DSP
Authors: Gong Ming Ju , Liu Yuan Lai
Published: October 2011

The Digital Signal Processors of TI C6000 series, have a structure called VLIW and a Harvard structure, and a electron system based on DSPs can meet the real-time requirement depending on making full use of the structures by its software. Therefore the executing efficiency of software will directly affect the real-time character of the whole system. In this article, several methods of software optimization for C6000 DSPs are summarized, including the use of intrinsics, data accessing band-width and software pipelining etc. Using these methods to optimize the C code software can mostly solve the bad real-time problems in processing and then the system can meet the real-time requirement.
Driver Maneuvers Reconstruction Based on Vehicle Traveling Data Recorder
Authors: Zeng Huan Tao , Zhang Hui , Wu Hong Jun , Yu Zhi
Published: October 2011

Steering angle features prominently in accident and driver behavior analysis or other applications, but can hardly be recorded in most monitoring devices such as vehicle traveling data recorder. According to vehicle kinematics model, this paper proposes a solution for steering angle determining based on longitudinal velocity and lateral acceleration signals. Simulation and experiments have been conducted to prove the method feasibility and reliability. Furthermore, trajectory reconstruction is demonstrated as one of the many applications of the steering angle estimation.
Application of Parallel Computation in Numerical Simulation of Laser Propulsion
Authors: Zeng Yao Yuan , Wang Zheng Hua , Zhao Wen Tao
Published: October 2011

As for the problem of numerical simulation oflaser propulsion of three dimensions and multi-sub domains, the domain decomposition strategy based on message passing mechanismis applied in this paper to realize parallelization. The cell-centered finite volume scheme is performed to solve Euler equation. A five-step Runge-Kutta scheme of explicit integral model is used for time advancement. The spatial discretization of inviscid fluid is estimated byhigh-order Godunov-type scheme. We test some different examples on a cluster system and the results show the smallest number of speedup is more than 5.19 when the degree of parallelism is 8. In a word, parallel computation is an inevitable choice to achieve the aim of accelerating the study of the mechanism of laser propulsion.
Design and Application of Var Compensation Method for Traction Power Supply Systems of Electrified Railway
Authors: Wei Ling , Xiao Jing Shuai , Geng Da Yong
Published: October 2011

The application of electric power, which acts as a pillar energy and economic artery in modern society, is one of the most important symbols of the level of development and comprehensive national power of a country. Var is a crucial factor for the design and operation of AC power systems, and is closely bound up with the safety, stabilization, and economical operation of power systems. With the development of electrified railway, the importance of the dynamic var compensation for traction power supply systems of electrified railway becomes more and more distinct. Developing the var compensation strategy vigorously has important senses in theory and practice. In this article, synthetically considering technique and economic leval of power systems in our country, parameters modeling and design and verification and specific engineering application of a var compensation method are presented. This method is a preferable one for resolving undesirable effect on power systems from traction power supply systems of electrified railway, especially having dynamic and real time characteristics of var compensation.
A Mobility Pattern Aware Clustering Mechanism for Mobile Vehicular Networks
Authors: Shi Yan , Zou Long Hao , Chen Shan Zhi
Published: October 2011

Clustering is one of the promising technologies for group mobility in mobile vehicular networks. MPAC (Mobility Pattern Aware Clustering) mechanism is proposed in this paper. MPAC aims at improving the stability of the cluster depending on GR (Group Relation), which is derived from some basic mobility metrics such as speed, direction, acceleration and vehicle location. The cluster formation and cluster maintenance operation based on the above mobility metrics are defined. Simulation results show that MPAC has obvious performance advantages in cluster stability, which is illustrated by the mean number of cluster reconfiguration and the mean life time of cluster heads.
Context-Aware Model Based Facial Expression Nets Analysis
Authors: Xu Chao , Feng Zhi Yong , Zhang Yu
Published: October 2011

Facial expression analysis is important in Human-Computer Interaction. How to improve the accuracy and objectivity of analysis should be concerned about. In this paper, a novel approach to context-aware based facial expression nets model is proposed. According to interactive environment’s characteristics and the relationship between context factors and facial expression features, CFEN model is constructed and applied to compute and analyze participant’s realistic facial expression in the context environment. It is possible to achieve facial expression’s knowledge representation and reasoning analysis. Experiment is designed and conducted to verify the theoretical model and approach proposed in this paper.
Study on Discharge of Separated Water Droplets in DC Field
Authors: Zhang Zong Xi , Yin Shan Feng
Published: October 2011

With the accelerating construction of strong smart grid, and the grid voltage level rising, performance requirements for the electrical insulation of electrical equipment also continue to increase. In terms of the advantages of RTV on antifouling, RTV-based paints coated insulator coating capacity of its flash tolerance can significantly increase, mainly due to RTV coating hydrophobic hydrophobicity and migration. But when the hydrophobic surface is in the fully wet, many small drops of water in the surface will be gathered into big drops of water, and these large droplets will distort the surface electric field of the medium. So the flashover voltage of the hydrophobic surface’s separated water droplets under DC electric field are analyzed comparatively in this paper, while some influencing factors such as different medias and volume of water drops, are introduced in specific experiments, and their effects on the flashover voltage are analyzed; under DC electric field experiment on the surface of hydrophobic and hydrophilic surface flashover voltage drops separation characteristics were studied.
Design of a down-Conversion Mixer for Four Sub-Harmonic in W-Band
Authors: Zhang Yin Sheng , Li Jia Qiang , Shan Hui Lin , Zhou Jie
Published: October 2011

This paper presents principles of a down-converted mixer for four sub-harmonic designed by ADS software. The LO and RF frequencies are 23GHz, 92-94GHz respectively. The structure of ridge waveguide to microstrip transitions is optimized by CST simulation software, and W-band signals are directed to mixer RF side. The simulation results show that this mixer achieves higher 1 dB compression point, loss of frequency conversion less than 15 dB and good linearity.
Quasi-Monte Carlo Gaussian Particle Filtering Acceleration Using CUDA
Authors: Jin Nai Gao , Li Fei Mo , Li Zhao Xing
Published: October 2011

A CUDA accelerated Quasi-Monte Carlo Gaussian particle filter (QMC-GPF) is proposed to deal with real-time non-linear non-Gaussian problems. GPF is especially suitable for parallel implementation as a result of the elimination of resampling step. QMC-GPF is an efficient counterpart of GPF using QMC sampling method instead of MC. Since particles generated by QMC method provides the best-possible distribution in the sampling space, QMC-GPF can make more accurate estimation with the same number of particles compared with traditional particle filter. Experimental results show that our GPU implementation of QMC-GPF can achieve the maximum speedup ratio of 95 on NVIDIA GeForce GTX 460.
A New Application Scheme of BPLC in Smart Home
Authors: Zhang Xue Fei , Liu Jing Hao , Zhang Wen Shuo
Published: October 2011

This paper presents a new application scheme of Broadband Power Line Communication (BPLC) in smart home. In this scheme the power line was chosen as “the last one meter connection”medium in order to reduce the length of the PLC link and improve the network property. In the newscheme, the power lines and PLC modem were used to construct the indoor Ethernet, and the home appliances were connected to this indoor LAN through the serial port/Ethernet network adapter as an Ethernet unit, then to access or control the home appliancesfrom the Internet through the home gateway, which is different from the common ones, is available. The new application scheme not only increases the management efficiency and reduce the cost of smart home, but also conquer the shortcomings of the traditional methods.
Configuration Design of Modular 3-PRS Parallel Robot and Dynamic Simulation Analysis
Authors: Lei Jing Tao
Published: October 2011

This paper presented model-based integrated design technology for configuration design of modular 3-PRS parallel robot. The kinematics screws matrix and constraint screws matrix of the end effector were obtained based on screw theory, the constraints of the end effector were analyzed and the degree of freedom of the robot can be determined. The forward kinematics of the parallel robot was analyzed according to the geometric relationship of a kinematics chain. Three-dimension solid model of the parallel robot was designed. Afterwards, the co-simulation of the mechanical and control system of the parallel robot was studied by applying virtual prototype technology to optimize the parameters of mechanical structure and control system. The simulation results of kinematics and dynamics can be obtained, which will offer basis for developing the prototype system.
Nonlinear Modeling and Simulation of Pneumatic Servo Position System of Rodless Cylinder
Authors: Zhang Shuai , Chen Jin Bing , Wang Tao , Fan Wei
Published: October 2011

This Paper describes a new modeling approach of rodless cylinder for pneumatic servo positioning systems and the identification of related parameters. A novel effective area function of the valve orifice is presented to produce a more accurate solution in valve modeling, which takes the offsets of the medium voltage into account. Besides, in the modeling of the cylinder’s friction, we take the stribeck effect into account. The results of simulation and the facts of experiments show the nonlinear model can reflect the characteristics of the servo pneumatic position system much better than former researches.
An Online Visual Inspection System for Oil-Seal Dimension
Authors: Wu Zhang Liang , Sun Chang Ku , Liu Jie
Published: October 2011

Adoption of machine vision inspection and computer image processing technology, an oil-seal dimension measuring system was developed to meet the requirement of online production and real time inspection. The makeup and principle of the system were introduced, as well as its working process and design requirements were described on detailed. The technique of quadratic filtering for image preprocessing combined with the principle of three points determining a circle, point Hough transform and the least squares was employed for image processing algorithm, and high precision sub-pixel edge detection was achieved. The measuring results of experiments demonstrated that the inspection goal on 100 percents of products could be realized successfully, and with many advantages such as non-contact, on-line, real time, appropriate precision and low cost, the system can be applied widely in other production fields.
Automated Image Processing for on-Line Photogrammetry
Authors: Wang Jun , Dong Ming Li
Published: October 2011

In order to monitor the deformation of the surface or dynamic adjustment and measurement, the real-time and on-line close range photogrammetry system is needed. Before camera calibration and 3D reconstruction, the targets in the images must be recognized and located automatically with high accuracy and speed firstly. This paper describes the automated image processing for the on-line photogrammetry system. Experimental results show that compared with the other measurement system, the accuracy of subpixel target centroid can reach to about 2% of the pixel size, while the process time of an image with 3008×2000 pixels is about 0.1S.
Computations of Transient Flows and Sprays of Port Fuel Injector
Authors: Yin Cong Bo , Zhang Zhen Dong , Guo Hui , Cheng Qiang
Published: October 2011

A CFD method was adopted to study the transient flow and spray characteristics of multiple nozzle holes port fuel injector. The flow field inside a port fuel injector was numerically analyzed, the predicted dynamic flow rate was compared with experimental data and the cavitations levels and location at different inject pressure were captured. Using Huh-Gosman breakup model, the atomization processes at the nozzle exit were predicted with initial droplet size distribution at primary break-up region refer to the experiment date. The liquid penetration and vapor distributions versus time from start of injection were also calculated.
The Modal Analysis for the Separate Frame Construction of a SUV
Authors: Huang Feng , Wang Li Juan , Chen Zong Yu , Du Li
Published: October 2011

The market share for sport utility vehicles is becoming increasingly very fast in recent years. Many auto companies are stepping up the work of research and development the new model of SUV. A new SUV body modal is studied in this paper. The finite element model of the SUV frame is built by the HyperMesh and the SUV frame modal is researched by the Nastran. Low-order vibration mode and the first bending and torsion modal strain energy distribution of the SUV body structure are obtained, and the SUV body structure of the dynamic performance was assessed in this paper.
Research on Pressure Resistance of Piston Type Submersible
Authors: Zhai Yu Yi , Lu Wen Jie , Zhou Yu , Xu Zi Li
Published: October 2011

Ups and downs control was one of the main contents in control of the submersible. A new ups and downs control system was used on the submersible with piston type. Its mechanism structure and experiment platform was introduced firstly in this paper. Then the theory design, underwater experiment and finite element analysis of piston cavity was made separately to verify its design reliability and stability. The results of experiment and emulation suggest that the piston type submersible design was reasonable, feasible and practical.
Study of Liquid-Solid Two Phase Flow in the Volute of Centrifugal Pump
Authors: Liu Dong , Wang Chun Lin
Published: October 2011

Particle Image Velocimetry combined with image processing program is used to measure the salt-out two phase flow in the volute. The velocity distribution of different phases are obtained respectively under different temperatures. The experimental results indicate that :As the increasing of discharge, the liquid velocity becomes larger; In the same radial direction, the velocity decrease as the increase of radial; As the temperature decrease , the particles become larger, and the particle velocity become smaller. Through analyzing the results, some characteristics of this kind flow in volute are obtained and some guiding advices are presented to designing the volute of two-phase flow pump.
Infrared Target Background Suppression Method Based on PDE and Morphological Filtering
Authors: Chen Yu , Li Gui Ying , Wang Hao , Zhao Ting
Published: October 2011

This paper has studied infrared target background suppression technology in the case of low SNR. In order to meet the high detection rate and the low false alarm rate, this paper presents a new infrared image background prediction method based on morphological anisotropic diffusion filtering. Experiments show that the proposed algorithm, under the condition of rolling background infrared image, has a good background predication and targeting enhancement.
Study and Implement of the Production Management and Cost Control Platform of the Manufacturing Enterprises
Authors: Ding Wei Min
Published: October 2011

This paper briefly introduces the requirtment analysis of the production management and cost control platform of the manufacturing enterprises, and the designing of the platform;it also introduces the main techniques and measures.
A Novel Method for Snowboard Course Design
Authors: Shi Ji Hong , Zong Rong , Huo Jin Ling , Li Qian Nan , Dong Zhong Zai
Published: October 2011

Mathematical models are proposed to determine the most suitable shape of a snowboard course based on vertical air, maximum twist and the practicability. Firstly, according to the kinetic energy theorem, the snowboarder can reach the maximum vertical air if the course is an ellipse. Subsequently, the maximum twist is obtained when the total vertical and horizontal velocities is maximum. Experiment result show that the model is a “practical” course which is adjusted to the most suitable tradeoffs.
Investigation and Analysis on Operation of Combined Wastewater Treatment Plants in Sunny and Rainy Days
Authors: Jin Jian Hua , He Li Gang , Jiang Ying He
Published: October 2011

In this paper, investigation and analysis on the operation of 3 combined wastewater treatment plants in sunny and rainy days in Wuhan city was made. The operations of lifting pumping stations in these plants were inspected. During sunny days, the processing units and equipments in these plants run in nearly full load and the load can only increase in a small quantity in rainy days. But the total waster water quantity in Wuhan in rainy days would reach to ten times more than wastewater quantity in sunny days. A large amount of untreated wastewater overflows from the channels to the bodies and causes heavy pollution to the water environment.
Image Based Positioning of the Freightcar’s Running Gear Springs
Authors: Zhao Quan Ke , Zhang Xiao Lin , Zhang Yu , Peng Jian Ping
Published: October 2011

Freightcar’s running gear springs are easily ruptured in the processes of manufacturing and using, losing the role of relaxing vehicle vibration, and resulting in accident. It is time to study the automatic recognition of springs defects based on image processing technology. Defects recognition is on the premise of accurate spring image location. An image location algorithm for the freightcar’s running gear springs is proposed in this paper, which is based on the structure characteristics of springs themselves. The algorithm mainly includes graying the image, correcting non-uniform illumination by wavelet homomographic filtering, taking binaryzation on image based on the iterative threshold method and locating springs’ boundary location, which could be obtained by image scanning column by column and feature analysis. This algorithm can achieve the automatic positioning of springs and has a good result to locate springs in the running gear images in case of different illumination; the accuracy rate has reached 96 percent. The study of this paper lays a foundation on the realization of automatic recognition of springs defects and has good application prospects.
Study of Delivery Quantity Model under the Condition of MTO
Authors: Hu Yan Hai , He Wei Ming
Published: October 2011

Under the condition of MTO, delivery quantity models are studied, and five delivery modes are introduced. They are traditional delivery mode, equal quantity delivery mode, inventory delivery mode, ratio delivery mode and free delivery mode. Aiming at minimizing total cost of the delivery system, models based on five delivery modes are established. At last, a numerical exampleis conducted and the result shows that free delivery mode is better than other four delivery modes.
Field Reliability and Maintenance Analysis of a Heavy Engineering Vehicle
Authors: Peng Jing Song , Jiang R. , Xu Jing
Published: October 2011

This paper presents an analysis of field reliability and maintenance performance for a heavy engineering vehicle operating in a steel mill. Based on the field repair reports of the vehicle, the statistical characteristics of reliability and maintenance performance are evaluated and the evolution trend of mean time between failures (MTBF) and availability are analyzed. The effect of the preventive maintenance (PM) interval on availability is evaluated and a possibly adequate PM interval is obtained. The analysis method presented in this paper is useful for analyzing and evaluating the reliability of complex repairable systems.
A Design of VB-DDC Using DA-Based Systolic FIR Filter
Authors: Xu Ping , Xia Wei , He Zi Shu
Published: October 2011

In this paper, we present yet another design of the variable-bandwidth digital down-converter (VB-DDC). The shaping filter in the DDC architecture is substitute with a method which is implemented with fully pipelined computing structure of systolic decomposition for distributed arithmetic (DA) based FIR filer. The systolic structure of the FIR filter involves significantly less memory and complexity compared with the existing ones. The effectiveness of the design is validated by the proposed FPGA implementation results.
Research on TG-DTG Analysis and Combustion Kinetics Characteristic of Biomass Fly Ash and Ash
Authors: Zhang Jun Jiao , Zhang Xu Ming , Jiang Da Long , Zhao Yuan Fang , Zhang Zhi Fei , Song Hong Wei , Lu Qiang , Dong Chang Qing
Published: October 2011

The fly ash and ash of different biomass power plants are selected as research objects, of which the combustion characteristics are studied. At the heating rates of 50°C/min, at the final reaction temperature of 900°C, and under the condition of air as carrier gas, weight loss curve and weight loss rate curve are analyzed respectively. TG, DTG curves of fly ash and ash from different power plant are gained, different combustion conditions are studied, and combustion kinetic equations of different biomass fly ash and ash are established, kinetics parameters are obtained by the Coats-Redfern method. Besides, combustion condition and reburning feasibility of different biomass fly ash and ash are analyzed, which provide a theoretical support for biomass power plant operation, such as improving their fuel burn rate.
A Case for A-Star Search
Authors: Chen Da Feng , Han Bing Qing
Published: October 2011

Unified read-write information have led to many theoretical advances, including Internet QoS and Internet QoS. After years of compelling research into thin clients, we confirm the emulation of the lookaside buffer. We explore a novel framework for the study of IPv7, which we call LeafedLyne.
Simultaneous Measurement of Temperature and Refractive Index Using a Fiber Bragg Grating and a Multimode Fiber
Authors: Tong Zheng Rong , Guo Yang , Yang Xiu Feng , Cao Ye
Published: October 2011

We introduce an all-fiber sensor capable of simultaneous measurement of temperature and refractive index (RI). The sensor system consists of a single mode fiber Bragg grating (FBG) and a single-mode-multimode-single-mode (SMS) structure which serves as a Mach-Zehnder interferometer (MZI), and the multimode fiber (MMF) is etched by hydrofluoric acid solution. The experimental results demonstrate that the temperature sensitivities of FBG and MZI are 0.016nm/°C and 0.093nm/°C, respectively, and the RI sensitivity of MZI achieves 226.25nm/RIU. The interesting properties of the sensor include compact size, high sensitivity and good operation linearity.
A Stable and Switchable Narrow Linewidth Fiber Laser
Authors: Yang Xiu Feng , Fang Xiu Li , Tong Zheng Rong , Cao Ye
Published: October 2011

A switchable fiber laser based on Mach-Zehnder interferometer (MZI) and photonic crystal fiber (PCF) is demonstrated. A section of PCF in the fiber laser is used to induce four-wave mixings (FWM) effect and MZI acts as a comb filter. Experimental results show that stable single-wavelength, dual-wavelength and triple-wavelength operations can be obtained with the adjustment of the polarization controller. The power of two peaks of the dual-wavelength laser is almost the same under room temperature with an output power fluctuation less than 0.6dB. The advantages of the proposed fiber laser include quite stable wavelength and narrow linewidth owing to the contributions of FWM in the PCF.
Verification of Model Reliability in a Double-Grate Biomass Boiler
Authors: Zhao Ying , Wang Tie Cheng , Wang Ning , Chen Qiu Luan , Ge Zhi Hua , Lu Qiang , Dong Chang Qing
Published: October 2011

A double-grate biomass direct-fired boiler is designed and modified with connected reciprocating grate and oscillation grate based on a 48t/h boiler current operation status. Ribbon and smoke are used in the cold experiments which are based on the reformed hot conditions to verify the model reliability. To have well comparison with the model result, the air ratio and inlet angle of the second air are changed and used to obtain the characteristics of the flow field of the actual grate boiler furnace. And it is the best working condition that the ratio of the air distribution primary air: second air: ignition air is 4: 4: 2, frontwall second air: backwall second air is 5: 5, the inlet angle of the frontwall second air rises 10°, the inlet angle of the backwall second air is in equilibrium position.
Feasibility Analysis of Tripping in Small Current Grounding System
Authors: Shu Yi Shi , Ma Li Li , Yu Pei Jie
Published: October 2011

With the development of integrated automation systems and distribution automation technology, considering the safety of grid equipment, the voltage security of low-voltage power grid, personal safety and the characteristics of small current grounding system , this paper points out that still follow the old rules that run 0.5-2 hours allowed in dealing with ground fault of small current grounding system is unreasonable, elaborates the new philosophy that the protection function of small current grounding should be distributed to the feeder protection device and implemented tripping. Theoretical analysis shows that the scheme is accurate, reliable, and highly practical.
The EMF-PF Fill Height Measuring Technique Using Multi-Electrodes in Parallel Connection
Authors: He Long Qing , Wei Kai Xia
Published: October 2011

A new sensor of the electromagnetic flowmeter in partially filled pipes (EMF-PF) is presented. With an array of parallel electrodes constituted by multi-electrodes in parallel connection as the measurement electrodes, the measurement electrodes alternate duties, sensing both the flow velocity and fill height signals. On the sensor pipe bottom, one pair of the electrodes is set as the signal injection electrodes that inject the AC signal used to determine liquid fill height. The theoretical analysis and experiment results indicate it feasible for the EMF-PF to employ this fill height measuring technique .
The Acoustic Emission Diagnose and Analysis of Journal Bearing‘s Inner Ring Looseness Fault by Truck Wheel
Authors: Cai Hai Chao , Wang Dong Feng , Xu Qiao Yu , Shang Zhen Dong
Published: October 2011

In this paper, we combine the characteristics of acoustic emission detection with the present condition of truck rolling bearing’s fault detection ,adopting the acoustic emission technique to examine railway freight car ’s journal bearing inner ring looseness .We put forward the method which wavelet packet analyze and withdraw bearing acoustic emission signal’s feature vector. Through the energy distribution comparison of inner ring’s non-looseness and looseness, we extract the ratio between high frequency’s internal energy and total energy as the characteristic parameter , which can recognize the inner ring’s loose fault effectively. Acoustic emission technique is a dynamic detection method, which can get materials’ important information,fatigue crack propagation,under the dynamic loading conditions. In comparison with the traditional vibration detection, it has the characteristics of the early prediction of bearing fault.
Dynamic Model of Compression Refrigeration System with a High Pressure Receiver
Authors: Zhai Wen Peng , Wu Ai Guo , You Yu Wen
Published: October 2011

Vapor compression chiller, the largest proportion of building energy consumption as the design and running characteristics, work at part load for most of the time. To improve the energy efficiency at part load, this thesis details some efforts to develop a dynamic model of a vapor compressor system suitable for optimal control design purpose. It present the model of high pressure liquid receiver which is important for the mass balance of the whole system and make sure it operated in a set-point designed. Additional experiments were also performed to verify the precision of the model.
Heavy Driving Drum Parametric Modeling Analysis System Development
Authors: Guo Yong Cun , Wang Zhu Fen , Hu Kun , Cheng Gang
Published: October 2011

Using the APDL (ANSYS Parametric Design Language) and combining the object-oriented visual design interface of VB, the parametric analysis and modeling system of belt conveyor driving drum is established. With the system, the designers only need to enter the right design parameters to generate the driving drum model and the corresponding post-processing results instead of the repetitive work. It improves efficiency and provides a basis for designing the suitable driving drum. The correctness and feasibility of the system was verified by analyzing examples.
Research on Support Distribution of the Handling Equipment for 500-Meter Long Rail
Authors: Kang Jing Xin , Zhang Lian Kai
Published: October 2011

Three sets of handling equipment were developed during the renovation of 500-meter long rail production line in Shahe Welding Rail Base Station. The equipment is nonstandard which includes multiple support units to uplift the long rail during its translating process. In this paper the relationship between the number of supports and the performance of the equipment will be discussed in detail.
Parameter Analysis and Optimal Design for Mobile Claw-Pole Alternator
Authors: Bao Xiao Hua , Liu Mou Zhi
Published: October 2011

Along with the increasing electric load in the mobile, the request of the mobile electric system is increasing as well. Today, the standard output voltage of the claw alternator in the mobile is 12V or 24V. The performance and efficiency of the traditional claw alternator in the mobile cannot meet with the increasing request of them anymore. In addition to actively develop the new claw-pole alternator, try hard to improve the performance and efficiency of the traditional motor by optimizing the parameters is a solution to the problem of efficient and economic means. This paper will calculate the basic mathematical claw alternator model of the 14V machine. Based on it, have the machine’s structural parameters analyzed and optimized, making the operating performance as high as possible on the basic size of the motor in the original.
The Optimization Design of Mechanical Structure Based on CAE Technology
Authors: Hu Gui Chuan , Liu Jing Hua
Published: October 2011

The important sign of product innovation is the superior to exploit better manufacture functions, light weight as well as reliable performances with lower cost. The paper is focused on the truss structure optimized design which is used for arch bridge reinforcement. The strength, stiffness and dynamics consideration are analyzed by finite element method (FEM), and the topology optimized truss structure is put forward based on the analyzed results.
OCDs Reliability Screening Using Normalization Variance of Noise Spectrum
Authors: Zhou Qiu Zhan , Gao Jian , Lei Na , Wu Dan’e
Published: October 2011

Considering the inflexibility and limitations of the traditional frequency-domain OCDs reliability screening method using noise parameters at fixed frequency-points, we put forward a new method using the normalization variance of a large frequency-band noise spectrum in this paper. The possible sources of excess noise in OCDs and the relationship between low-frequency noise and reliability are studied at first, and then we describe the detailed process of the method for reliability screening, including the normalization method of noise spectrum, the calculations of variance and related characteristic quantities. At last, compare the screening results obtained by both of the previous method and this new method, and it demonstrated that this method is much more accurate and reliable.
Design of Optical Access Network Implementing DVB Business and IP Business
Authors: Sun Wen Feng , Li Yan Zhao
Published: October 2011

The paper illustrates the optical access network which includes AON (active optical network), PON (Passive optical network) and EOC (Ethernet over COAX) systems, implementing DVB business and IP business. The optimal optical access technology is selected according to different access situations in the project. The optical access network accomplishes the wire access and wireless access. In order to reduce the cost, the coax is efficiently used.
3-D Finite Element Simulation of Impact Damage of Laminated Plates Using Solid-Shell Interface Elements
Authors: Wang C. , Zhang H. , Shi Guang Yu
Published: October 2011

This paper presents the finite element damage simulation of laminated plates induced by low-velocity transverse impact. The solid elements are used to model the laminae, and the solid-shell interface elements are employed to characterize the behavior of the interfacial layers of the laminated plates. The material properties of the adhesive layers are used in the solid-shell interfacial elements for the damage prediction. The simulated damage propagation agrees well with the experimental results. Therefore, the numerical results show that the solid-shell interface element is a good computational model for the interfacial layer modeling in the damage simulation.
The Design of Optical Fiber Fault Locator Based on FPGA
Authors: Wang Yi Jun , Zheng Li Na
Published: October 2011

This paper presents in detail optical fiber fault locator's operation principle, fabrication technology and application. A prototype apparatus has been fabricated, which reaches commercial standard, resolves the problem of traditional OTDR price expensive and the operation complicated . All component s including optical devices, electronic devices and data measurement are demonstrated. Furthermore, through measuring the fiber sample, the function and measurement efficiency of this apparatus is analyzed.
Preparation and Characteristics of Multilayer Magnesium Diboride Superconducting Films via CVD Method
Authors: Wang Song , Zhou Zhang Yu , Yang Fa Shun , Yang Jian , Fu Xing Hua
Published: October 2011

In this work we present the technology of preparing multilayer MgB2superconducting films via CVD method. The first layer of the MgB2superconducting film was obtained by two-step method: growthing the precursor boron film on a polycrystalline Al2O3substrate first, then post annealing the film in magnesium ambient, thus we got the first layer of MgB2film. After that a pure boron film was deposited on the MgB2film , acting as the medium insulating layer, finally the second layer of the MgB2superconducting film was formed by in-situ growth, evaporated magnesium atoms and boron atoms that decomposed from diborane met near the substrate and generated the second layer of the MgB2superconducting film. The square resistance of the boron medium insulation layer is higher than 20 MΩ. The transition temperature of the both superconducting films was above 38 K, and the temperature for zero resistance is above 37 K. We found that different thickness of the B layer made different I-V curve between two superconducting films, which is very important for the use of Josephson junction. More meaningful results can be expected as the experiment goes on.
A Method of Machining Micro Hole and Micro Cavity in Ceramics
Authors: Li Jian Zhong , Wu Tao , Zhang Long
Published: October 2011

For machining micro hole and micro cavity in ceramics, a manufacturing methods based on green machining have been systematically researched. The micro tool was prepared on-machine by micro electrical discharge machining (EDM). The tool size for micro hole drilling was determined based on extensive experimental results of the sintering shrinkage ratio and the gap caused by the removed ceramics particles between the tool and the workpiece to achieve the desired hole diameter. The tool path design was based on the tool size, the shrinkage ratio and the gap which is different from that in micro hole drilling. Micro holes with diameter of 100μm and micro cavities with upper surface size of 500μm×500μm was machined in ceramics successfully by this method. The final size error was controlled less than 2.25% in micro hole drilling and less than 2% in micro cavity generation.