bluuebunny/crossref_metadata_2025 huggingface dataset:
The Design of Five Degree of Freedom Robotic Arm System
Authors: Xu Chang Kai , Li Ming , Liao Yuan Jiang
Published: November 2011

This paper details the design, production and programming methodology of a five degree of freedom robotic arm system. All the hardware and software of the robotic arm have been designed by author and manufactured successfully by CIMS & Robotics Center of Shanghai University. It is the arm of a service robot which is to present the following functions: Chinese calligraphy, carry something from one place to another exactly, and other accurate positioning motion in space. The robotic arm system is based on five orthotropic digital DC brushless servo motors in mechanism, five digital servoamplifier and other devices. Our communication mode is Can-bus, the control software is designed by vb.net2005 language under the .net framework and emulation based on matlab.
Research on the Identification of Tubular-Furnace Based on CARIMA Model
Authors: Chen Zai Ping , Li Xing Jun , Dong En Zeng
Published: November 2011

Atmospheric and vacuum furnace is a complex control object, in particular, combustion system and multi-branch feeding the outlet temperature control system is interconnected multiple-input and multiple-output coupling multivariable time-varying systems. Using multivariable decoupling control methods will have better control effect, but in fact, because of the nonlinear time-varying systems, and other factors, it is difficult to obtain more accurate mathematical model of the system. Based on CARIMA model, a distributed lags model is constructed in this paper. In the numerical simulation, the proposed model has a excellent recognition result, can achieve an arbitrary precision according to actual requirements.
2-Phase Symmetrical PWM Generator Using CPLD for Ultrasonic Motor Drive
Authors: Zhang Wen Yu , Shi Jing Zhuo
Published: November 2011

Push-pull driving circuit is a type of commonly used driving circuit for ultrasonic motor. The symmetrical PWM signals are needed for the control of push-pull driver, and thus the motor. This paper introduces a novel 2-phase symmetrical PWM control signal generator that can be used with ultrasonic motor drive. The generator’s structure and operation is analyzed, and the actual realization using CPLD is also given out. The experimental results proved that, the design is correct.
Nonlinearity of PMSM’s Low-Speed Operation Caused by Dead-Time
Authors: Zhang Wen Yu , Shi Jing Zhuo
Published: November 2011

PWM technology has been widely used in motor drive systems today. To avoid the short-circuit condition, dead-time must be inserted to the PWM driving pulses. The addition of dead-time increases the harmonic of output voltage, makes the waveform of winding current more badly. The ripple of motor torque and speed is also increased by the addition of dead-time. The influence of dead-time is more remarkable while the motor speed is low, and so, greatly influence the low-speed working ability. This paper analyzes the influence of dead-time for low-speed motor drive in detail. The nonlinear phenomena in the motion of output voltage-vector, which affects the motor’s low-speed performance directly, is also indicate
Servo Motor Synchronous Control System Based on PMAC Controller
Authors: Yao Yu Peng , Dai Ming Xia , Fei Ji You , Shi Ying
Published: November 2011

A synchronous detection NC system is introduced based on an open multiracial PMAC controller and Panasonic servo motor where IPC is used as host computer, PMAC as control system center, and Panasonic servo AC system is used as drive. The PID control model of the servo motor is built with Simulink. When Kp equals to 0.55, KI equals to 1. 8, and KD equals to 0. 04, the simulation is carried out and the result meets the requirement of 0. 05 second. By using Honey Bee NC cutting machine to complete synchronous detection and control of the two servo motors, the synchronous operation error is obtained. The result shows that the servo motor synchronous control system, whose absolute average of relation deviation is 2.919%, reaches the requirements of technology and precision of gas cutting NC system.
Research on Internal Communication of Redundant Flight Control Computer for UAV
Authors: Zheng Lei , Chen Xin , Lv Xun Hong
Published: November 2011

Regarding the characteristic of the architecture of the sample redundant flight control computer based on CAN (control area network) bus, a bus protocol of internal communication based on time-triggered is presented. The protocol-frame, data-frame, synchronization arithmetic of internal communication are designed. According to the protocol, the communication between the CPU (central processing unit) and each other function unit can be reliable. At the same time, if some node of the network were failure, CPU can check it reliably and then carry through relevant switch logic to realize the redundancy management. The results of the experimentation show that according to the bus protocol designed in this paper, the internal communication of the FCC (flight control computer) was reliable, at the same time, the fault-detect and redundancy management can be realized.
Study of Missile Radiator Predicting and Tracking Technology on the Basis of Kalman Filter and Mean-Shift Algorithm
Authors: Xu Zhen Hui , Mao Bao Quan , Xu Li , Zhao Jun Yan
Published: November 2011

In order to improve the real-time character of missile radiator tracking and solve the predicting tracking problem when missile radiator shortly shelter or missing, it introduces moving target predicting and tracking technology. According to the predicting and tracking method, it proposes three predicting and tracking overall schemes of missile radiator based on Kalman filtering and improved Mean-Shift algorithm. Also it compares the real-time character of three kinds of schemes. According to the trajectory character of missile radiator, it constructs Kalman filter. The experiment results indicate that by using Kalman filtering technology, there are improvements in real-time character and shortly shelter or missing problem can be solved well. It plays a certain compensation function to the whole system.
Research of Optimal End Guidance Law about Target-Seeking UAV under Passive Guidance
Authors: Cao Jian , Zhu Xiao Ping , Wu Jian Feng
Published: November 2011

Measuring the relative distance, relative speed and target acceleration under knowing only angular information is called a "passive track" problem to target. Because of the noise in measuring result, it is necessary to describe a "passive track" problem by nonlinear random system. This paper researches optimal end guidance law about target-seeking UAV under passive guidance. As a simulation result, optimal end guidance law attacking fixed target is superior to constant coefficient proportion guidance law.
Start Control of Ultrasonic Motor Based on Neural Network
Authors: Zhang Hui Min , Wang Hai Yan , Shi Jing Zhuo , Liu Xun
Published: November 2011

It is very hard for the traveling wave ultrasonic motor to start directly with high speed, because of their special running mechanism and the unique features. To solve this problem and realize the uitrasonic motor’s high-speed start control, speed controller with on-line self-tuning parameters is designed. Neural network is used to realize the online adjustment of controller’s parameters, to agree with the different starting request of different speed references, and make best use of motor’s ability. The experiments indicated that the motor start fast and accurately, the control algorithm is effective and reliable.
Numerical Analysis on Propagation and Fatigue Life of Asphalt Pavement Surface Crack
Authors: Wang Hong Chang , Li Guo Fen
Published: November 2011

Focusing on the severity of asphalt pavement surface crack, a finite element analysis model of 20-node isoparametric elements was established by the commerce FEM software ABAQUS with the base of fracture mechanics theory. The surface crack of pavement was numerical analyzed and the crack propagation life was evaluated by Paris formula. In the course of surface crack propagation the change of the stress intensity factor (K2) was discussed and the effect of pavement parameters on surface crack fatigue life was studied. The analysis indicates: (1) the propagation of surface crack is dominated by deflection load. In the course of crack propagation, at first K2 increases to the top then drops down slowly. (2) the important influence factors to the surface crack propagation life at the scope of road structure parameter, are thickness and modulus of surface course, the modulus of base course. But modulus of subgrade, thickness and modulus of subbase course and thickness of base course are of no effect.
Mudstone Creep Test and Numerical Stimulation of Casing Loads in Deep Well
Authors: Xu Zhi Qian , Yan Xiang Zhen , Bu Fan
Published: November 2011

In this paper, a creep test was carried out for simulating the creeping of the core of the mudstone under condition of deep formation subsurface conditions by MTS-810 test system, the creep rule and the characteristic parameters of the mudstone formation were obtained from the experiments. According to the test results, the finite element model for casings load calculation was established, and the calculation program was also written. With the program, the casing load of one western oil well was calculated in mudstone formation. The numerical simulation results show that the casing load has a relationship with phase angle θ and creep time, and the casing load is 10% greater than the stress in situ.
Research on the Integration Credibility Model of COTS
Authors: Wei Shan Pei , Shen Li Qiang , He Hai Jiang
Published: November 2011

The integration credibility model of the component is constructed by inspecting the sub-attributes of the component and calculated by summarizing the probability with experience. The component is quantified from its reliability, usability, testability, security and maintainability thus providing a numerical measurement method that is directly comparable. According to the component’s integration credibility, the component customers select the component from the database to reduce the risk of the system integration.
Simulation and Implementation for the Speed Control System of Horizontal Continuous Casting Dragger for Copper
Authors: Chen Yue Dong , Xia Zhen Hua
Published: November 2011

The levels of continuous casting process of copper and copper alloy billet have many advantages, such as taking small footprint, low investment and the shorter flow. Recently, it develops very quickly all over the world. This article designs the dummy body drive control system based on the DSP digital signal processing chips, inverter and variable speed induction motor, and uses the unique process that space vector pulse width modulation strategy can achieve continuous casting horizontal tractor’s four beats to realize continuous casting process’ high-quality, stable and reliable implementation. Early in the 19th century, German Bismarck had proposed a continuous casting process in his patent. The development of this method in the copper industry began in 1940s, the type of equipment went through belt type, vibration mold, vertical traction type, tilt casting type and Horizontal traction type [1, 2]. Now, horizontal traction, as the most popular method abroad, because its products don’t need straightening, and consistency of properties along the length and high density of grain lead to the improvements of mechanical properties and electrical properties, its superiority in product quality and production efficiency is obvious. The design combined the modern AC variable speed control and advanced SCM control technology and traction continuous casting process to design a Speed controller of horizontal continuous casting of copper traction motor, its performance is similar with to dummy industrial control computer and AC servo motor drive control system, but the configuration of the hardware is less than half the price.
Experimental Research on Vacuum Casting of Micro-Gears
Authors: Zuo Xiao Ming
Published: November 2011

This paper discusses the feasibility of vacuum casting of micro-gears by using silicone mould of micro-gears which was designed and manufactured by the author. Orthogonal experiment is adopted to explore the influence of temperatures of mould, resin and solidification and the time of vacuum deaeration upon the shape and size of micro-gears. The result of research shows that formed parts with high precision can be obtained by vacuum casting of micro-gears with silicone rubber mould, and the time of vacuum deaeration greatly affects the shape and size of formed parts of micro-gears
Formation Behavior of Intermetallic Layer on Die Material in Casting Al-Si Alloy with the Variation of Fe Content
Authors: Kim Bong Hwan , Lee Sangh Wan , Lee Sang Mok
Published: November 2011

This study aims to investigate the formation behavior of intermetallic phases on casting mold die and its effect on erosion tendency in molten Al-Si alloy with the variation of Fe content. For these purposes, dipping tests of die material into molten Al-Si alloys with 0.98 and 1.33wt%Fe were carried out as a function of dipping time. Three kinds of intermetallic phases, α-AlFeSi, β-AlFeSi and θ-AlFe, were found to form on the interface between die and molten alloy in sequence, as iron and aluminum solutes diffuse into the molten alloy and die steel, respectively. It was discussed that the erosion process was decelerated in the case of the high-iron containing alloy, because of the decreased gradient of iron solute through the interface and enhanced diffusion barrier of intermetallic layer.
A Method to Reduce Milling Time for Ti-6Al-4V Alloy for Controlled Depth Milling Using Abrasive Water Jet Machining
Authors: Pal Vijay Kumar , Tandon Puneet
Published: November 2011

This Abrasive Water Jet Machining (AWJM) process is usually used to through cut materials which are difficult to cut by conventional machining processes. This process may also be used for controlled depth milling (CDM) of materials. This work primarily focuses on controlling the abrasive flow rate to reduce the time for machining the component. Here, an experimental setup is made with a modified attachment for abrasive feed system to machine for Ti-6Al-4V alloy. The work also investigates the surface morphology, tolerance on depth of machining and surface waviness for the modified setup. With change in mass flow rate of abrasive, the traverse speed is altered and its effects on the machining time are studied. It is observed that traverse speed is an important parameter in the case of CDM for AWJM. It is also shown that surface waviness can be reduced as traverse speed is increased by using modified abrasive feeding system.
A Finite Element Analysis of the Normal Combination Round and Spline Broach Based on ANSYS
Authors: Zhang Guang Guo , Sheng Jing , Wang Feng
Published: November 2011

In the traditional design of round broach ,the impact tools of broach maybe unable to achieve the requirements for the processing precision, or even occur the situation of partial fracture due to a exaggerated partial deformation. In this article, by using Pro/E we complete the 3D solid modeling and the dimensional parameterization of the impact tools for combination round and spline broach, then import the 3D model into ANSYS, to analyze and solve the whole process of load and deformation at work. It can effectively improve the machining accuracy and the reliability of round broach, shorten the design cycle and reduce cost.
Performance Analysis of Doubly Excited Brushless Machine with Radially Laminated Magnetic Barrier Rotor
Authors: Liu Hui Juan , Xu Long Ya
Published: November 2011

The performance of a doubly excited brushless machine (DEBM) with radially laminated magnetic barrier rotor (RLMB-rotor) is investigated by using the 2D transient finite element analysis model and the experimental method. The magnetic fields, the mutual coupling of the dual stator windings, the no-load characteristics and the electromagnetic torque characteristics of the sample machine are presented. The results of the experiment validate the theoretical analysis and simulation results.
Study on Electronic Excitation Temperature of Argon Plasma Using Low Pressure Micro-ICP Excitation Source
Authors: Wang Yong Qing , Chong Na , Dong Li Mei , Tang Yu Jun , Song Hai Jun
Published: November 2011

Electronic excitation temperature is an important indicator of the spectrometer excitation source. This work experimented self-made micro-ICP excitation spectroscopy based on PCB technology, and detected 17 spectral lines in 690~860 nm of argon atom. 763.51 nm and 772.42 nm spectral lines whose wavelengths are close to were used to calculate electronic excitation temperature of argon excited by micro-ICP, and results show in 1600~3000 K. Experimental test data shows effects of argon gas pressure on electronic excitation temperature that in 20~210 Pa electronic excitation temperature increases with pressure on the whole. When argon pressure is greater than 220 Pa, plasma flame flickers and the electronic excitation temperature shows greater fluctuation; Experimental test shows effects of RF power on electronic excitation temperature that in 3~23 W electronic excitation temperature gradually increases with RF power. Causes of electronic excitation temperature with pressure, RF power variation are analyzed.
Influence of Rotor Structure on Starting Performance of PMSM Used for HEV
Authors: Li Wei Li , Li Zhi Peng , Chen Ting Ting
Published: November 2011

Permanent magnet synchronous motor (PMSM) used for driving hybrid electric vehicle (HEV) have the characteristics of high power density, high efficiency, high reliability and good dynamic performance. However, it’s a very complex process for PMSM pulling into synchronization and it is difficult to analyze and calculate the starting and operating performance exactly, which would be very important for HEV application. So based on the requirement of HEV, a 30kw PMSM is studied. The 2D transient electromagnetic fields of this motor were calculated by using an improved finite element method. Starting performance was analyzed, and some parameters such as stator current and time-speed characteristic could be obtained. From the study on performance of machine with different ratio of spacing of damping bar (Lb) / stator pitch (Ls) in solid rotor and different number of damping bars in laminated rotor, that influence of rotor structure on starting process were studied. The calculated results show good agreement with the experimental data. Some reasonable conclusions were obtained, which could provide some help for the design of this kind of PMSM and the application of it in HEV.
Broken Rotor Bar Fault Detection Analysis
Authors: Sun Li Ling , Chen Kai Bin
Published: November 2011

Induction motor is widely applied to people's lives and production. This paper presents the simple and sophisticated of some methods which are used to diagnose the rotor fault. After analyzing the advantage and disadvantage of these methods, this paper tells what the key of rotor fault diagnosis of induction motor is, and put forward a new method.
Research on Growth Process and Microstructure of Microarc Oxidation Coating on Titanium
Authors: Li Shi Jie , Hu Jie , Cao Xiao Ming
Published: November 2011

Porous ceramic layer was deposited on pure titanium substrate by micro-arc oxidation(MAO). XRD and SEM were employed to characterize the phase composition and microstructure of the film. The effects of micro-arc oxidation time on microstructure and phase composition of TiO2 coating were analysed. The results show that, with the increase of oxidation time, the number of micro-pores decreases, while the size of micro-pores, roughness and thickness of MAO coating increase.MAO coating shows dentrites grew, but not traditionally nucleation and grow. Oxidation coating growth inward, while at the same time to growth outward. Grow into a dense ceramic membrane layer inward, outward growth into the porous layer. The coating is mainly composed of Ti, anatase and the rutile phases.
Research on the Characteristic of Diesel Elastic-Plate Impingement Spray
Authors: Wang Chang Yuan , Liu Fu Shui , Li Xiang Rong
Published: November 2011

A series of experimental research results on the characteristic of diesel elastic-plate impingement spray using High Speed Photography camera are presented in this paper. The experiments were carried out in a constant volume chamber specially designed, which can hold a high ambiance pressure. The special fixed device was designed so that the elastic-plate can be fixed on the spray path, meanwhile the spray incident angle and height can be changed. The free jet spray and elastic-plate impingement spray was compared under the same experimental condition including different injection pressure and different background pressure. Experimental research showed that impingement spray droplets diffuse more quickly than free jet spray.
Study on Acoustic Emission Source Character of Various Welding Defect Types
Authors: Wang Wei , Dou Yan Tao , Wei Hong Xing , Heng Hui Ming , Zhen Yu
Published: November 2011

The detection of welding defects type of the specimen made of WELDOX960 steel based on acoustic emission (AE) technology has been investigated. Firstly, three-point bending test on the three kinds of specimens, that is, the specimen with severe slag inclusion, the one with blowhole welding defect and the one with good welded joint was conducted respectively. Then the analysis of AE source characteristics and statistical parameters distribution characteristic were introduced. As the result, for the specimen with severe slag inclusion and the specimen with good welded joint, we find AE characters such as amplitude and energy rate has similar change trend except for the intensity, hit counts and duration time, and the extent of the former one is larger than that of the latter one. However, for the specimen with blowhole defect, along with the whole loading process, the evident AE signal character of crack generation and propagation happen all the time. Also we found the parameter distribution of amplitude, count and duration time of the three kinds of specimens were distinctly different and have its own characters, which indicated that the three kinds of AE source can be distinguished using the AE technology.
Scattering by a Conducting Infinite Cylinder Illuminated with a Gaussian Beam
Authors: Shi Zhi Wei , Zhang Bo , Sun Xian Ming
Published: November 2011

An expansion of the incident Gaussian beam in terms of the cylindrical vector wave functions natural to an infinite cylinder of arbitrary orientation is presented. With such an expansion, the problem of interaction between a Gaussian beams and an infinite cylinder is studied in the framework of the generalized Lorenz-Mie theory. As an example, for the case of a tightly focused Gaussian beams propagating perpendicularly to the cylinder axis, the scattering characteristics are described in detail, and numerical results of the normalized differential scattering cross section are evaluated.
Speed Sensor-Less Indirect Vector Control System Based on a Novel Sliding Mode Control Speed Observer
Authors: Li Guo Hua , Wang Ji Qiang
Published: November 2011

Vector control is one of the most popular control techniques of induction motors. Owing to its simplicity, the indirect vector control gains increasing popularity. This paper proposes a speed sensor-less indirect vector control system of induction motors based on a novel sliding mode control (SMC) speed observer. The observer uses the stator current difference of the estimated value and the actual value to calculate the rotor speed. The simulation results show that the method has a fast response and high accuracy, and it robust to parameter variations.
Modeling and Analysis of Electro Hydraulic Brake System Based on AMESim/Matlab
Authors: Jin Zhi Lin , Zhao You Qun , Shi Rui Kang , Guo Li Shu , Shi Zheng Tang
Published: November 2011

Electro Hydraulic Brake (EHB) system plays an important role for improving vehicle active safety. In this paper, the dynamic behavior of EHB system is discussed. From its working principle, a dynamic model of quarter EHB system is established based on AMESim and Matlab. To analyze performance of the proposed EHB system, the strategy of Single-Neuron PID regulation is presented and a typical numerical case is given. The results show that this strategy can obtain good performance and proper parameters can improve the dynamic characteristics of EHB system effectively.
Extreme Weather Loading Risk Model of Overhead Transmission Line
Authors: Sun Yu , Wang Xiu Li
Published: November 2011

Power grid suffers tremendous economic loss in extreme ice disaster weather, suggesting that it lacks immediate precautionary system. On the basis of the standards of Q/GDW179-2008 and IEC60826-2003, the curve of transmission line design loads is built up. In view of ransom character for load-strength of transmission line, according to load-strength interference theory, a short-term wind and ice loading risk model is established, which is a time-dependent wind and ice loading model, and can be calculated unreliability probability and fault rate, showing risks about cluster fault and common fault. Furthermore, wind and ice loads are divided into five states, which show risk margin of loads. It also can provide precautionary information for operator, and can present risk measurement on time scale.
Study on Simulation of Three-Phase Z-Source Inverter for Grid-Connected Wind Power Generation
Authors: Zhang Hua Qiang , Wei Peng Fei , Li Wei Wei
Published: November 2011

For the special requirements of grid-connected inverter used in wind power generation system, a kind of three-phase Z-Source inverter operational principle is analyzed in this paper. Formulas for the design of main parameters under the control of constant duty cycle of shoot-through switching state are derived. Then the simulation models of SVPWM with shoot-through zero vectors are established by using Matlab/Simulink in order to control the switches of Z-Source inverter on and off. The independent control strategy of d-axis and q-axis currents is used to achieve a unity power factor grid-connected aim. Simulation results show that the theoretical analysis and the simulation models are validity.
High-Sealing Microvalves for PCR
Authors: Li Xue Ting , Wang An Qun
Published: November 2011

This paper reviews several suitable microvalves for polymerase chain reaction (PCR). First, three type micro-valves in PCR chips are discussed, including pneumatic, servomotor-controlled and passive plug microvalves. Then we present our servomotor-controlled microvalves, with the structure of long passive plug. This valve had many obvious advantages such as simple fabrication and operation, perfect sealing, the ability to withstand relatively high pressure. Furthermore, the microvalve can be operated in a self-actuated mode.
Theories on the Digitalized Intelligentized, Networked, Miniaturized Development of Electronic Technology
Authors: Li Jing Min
Published: November 2011

Our instruments industry is of some size, initially formed a complete production, scientific research, marketing system. We have more than 6,000 various electronic enterprises, with annual sales of approximately 10 million yuan, have become to Asia's second-largest producer of electronic besides Japan. According to the customs statistics, after complete supporting project introduction, the prize of all kinds of instruments we have imported is nearly 70 billion dollars till 2008, to take up 50% of the total electronic industrial output. But our current electronics industry products mostly on medium lower grade, with the digitalized intelligentized, networked, miniaturized product become the mainstream, the gap will further increase. At present, most of our large-scale instruments and equipments are imported. Foreign products share more than 60% of our market on intermediate products and many key components, whereas homebred analysis instruments share less than two in a thousand of global market.
Analytic Prediction of Inductances for Toroidal Motor with Concentrated Windings
Authors: Liu Xin , Xu Li Zhong
Published: November 2011

Toroidal motor is a new type of motor. The basic structure of the motor is introduced. Spiral space current in the worm windings is analyzed. The magnetic motive potentials and magnetic linkages produced by two current components are developed. The inductance equations for the toroidal worm windings are deduced. Using these equations, the changes of the winding inductance along with the planet position angle for the drive system are investigated, and the oscillation and the period are discussed. The test of inductance measurement for the motor is done. Test results confirm the validity of the deduced equations. The results offer reference for the dynamic performance analysis and practical application of the novel motor.
Analysis of Tribological Characteristics between Plastic and Steel Helical Gear
Authors: Hao Yi Shu , Zhang Bao Gang , Peng Bei
Published: November 2011

The application of plastic gear is becoming more and more widespread due to its advantages of low noise, shock and vibration absorption and self-lubrication. Friction heat of plastic gear is an important reason for their failure, because the thermal conductivity of plastic is smaller than the metal and the heat generated by friction is an important factor for temperature rising of plastic gear. This paper established a tribology and temperature model of plastic gear transmission by the way of theoretical analysis and finite element simulation of plastic and steel helical gear transmission. The result of finite element analysis shows that friction heat of plastic gears generated during meshing is comparatively large, but the friction of plastic gear and steel gear during the process of meshing is small. The analysis conclusion, contrapose the tribological properties between plastic and steel helical gear, enriched and improved the research in this field and provided some ready-made experiences.
Design of Real-Time Monitoring System for Surface Water Pollution Based on GPRS
Authors: Chen Guang Jian , Jia Jin Ling
Published: November 2011

To implement the remote and real-time monitoring of surface water pollution, a design scheme of water quality monitoring system based on GPRS technology is put forward, which is composed of monitoring terminal, monitoring center and communication network. The various parameters of surface water are acquired using water quality detection sensor terminal and uploaded to the remote monitoring center via GPRS module by monitoring, and then the water quality parameters acquisition, processing and wireless transmission are realized. Water quality parameters are received through the internet network by the monitoring center, to realize its remote monitoring and management. According to the practice result, the system has materialized functions on GPRS service platform, such as real-time water quality parameters acquisition, procession, wireless transmission, remote monitoring and management, which is suitable for surface water pollution continuous monitoring and has the good application in the future.
Fuzzy Hierarchy Comprehensive Evaluation on Dam-Break Risk Analysis
Authors: Wang Xiao Ling , Zhou Zheng Yin , Sun Rui Rui , Zhou Sha Sha
Published: November 2011

Consequences of dam-break are affected by many factors, which are of a certain degree of ambiguity. Influencing factors of dam-break consequences are summarized in this paper. At first, weights of influencing factors are determined by means of Analytic Hierarchy Process （AHP）, thereafter, the fuzzy hierarchy synthesis evaluation model for dam failure is developed. Finally, Qing Linjing reservoir located in Shenzhen of China is taken as a case. The fuzzy comprehensive evaluation for the risk analysis of dam-break and the risk grades of dam-break consequences are obtained. The results indicate that it is reasonable and valuable to evaluate the risk of dam-break by using fuzzy comprehensive evaluation.
Stabilization for Quantized Feedback Control Systems: An LMI Approach
Authors: Fang Jin
Published: November 2011

This paper addresses the feedback stabilization problem for quantized feedback control systems, where sensors and controllers are connected by a digital communication channel. A dynamic, logarithmic quantization scheme is proposed. It is shown that quantized feedback control problems can be converted to robust control problems. The proof techniques rely on the LMI approach. Simulation results show the validity of the proposed quantization policy.
An Adaptive Tracking Algorithm of Maneuvering Target
Authors: Shi Zhang Song , Zhang Pi Xu , Li Rui , Wang Shen
Published: November 2011

In the existing process of maneuvering target tracking, the target’s actual trajectory can not be foreseen precisely. A commonly attempt is under the assumption that the target’s trajectory is prefixed. The prefixed model is usually not inosculated with the target’s actual trajectory, and the target’s tracking precision can not be guaranteed. In this paper a parameter identification model is presented. This model identifies the target’s trajectory dynamically, adapts to the variation of working cycle, and covers kinds of possible state of the maneuvering target. An adaptive filtering is then employed to analyze the tracking. We call it as a whole adaptive tracking in this paper. Simulations verify that this adaptive tracking algorithm effectively improves the tracking precision.
An Automatic SoC Design Methodology for Integration and Verification
Authors: Ma De , Huang Kai , Xiu Si Wen , Yan Xiao Lang , Feng Jiong , Zeng Jian Lin , Ge Hai Tong
Published: November 2011

The increasing complexity of current SoC design brings a great challenge to SoC designer for fast SoC RTL integration and effective verification. In this paper, an automatic SoC integration methodology based on IP-XACT standard is proposed as a complete and effective solution for low-level RTL simulation, FPGA emulation and ASIC implementation. A bottom-up approach is adopted for design integration and verification from component level, to SoC core level, and then to final chip level. The three-core MPSoC case study not only gives the detailed usage and analysis on the proposed methodology, but also shows its efficiency to integrate a complex SoC design and its feasibility for correct SoC implementation.
Design and Analysis of a Piezoresistive Accelerometer with the Film-Island Structure
Authors: Yang Xing Min , Zhang Wei , Zhao Wei
Published: November 2011

In this paper, we propose a piezoresistive accelerometer with the film- island structure, whose working range is up to 100,000g. Compared with the beam-island structure, the film-island structure has some advantages. With the film squeezed, the damping and the stiffness increase whereas the transverse sensitivity decreases. The fragmentation can be avoided in the overload situation. The damping characteristics, which are crucial for this accelerometer design, are theoretically analyzed in depth, and are verified by FEM simulation with ANSYS.
Application of Model Predictive Control Based on BPNN to Heating Boiler
Authors: Wang Yan Ping
Published: November 2011

This paper presents the algorithm of model predictive control (MPC) based on BP neural network to the burden system of the heating boiler. Because the burden system of the heating boiler is complex, the proposed approach uses steady, effective way to control the boiler. There is a closed-loop, repeating online optimization, model-based control algorithm which deals with the feedback information and the quantity of the fuel entering the boiler by the way of multi-step future predicting and compensating based on BP neural network. By simulation, it is demonstrated that the burden system of the heating boiler using MPC as control method is better in performance than the traditional PID. Besides, it is compliant to the model of the controlled object, especially to those which parameters of the model are variable.
The Optimization Model and its Algorithms for Multiple Transportation Modes Selection in the Fourth Party Logistics
Authors: Li Gui Hua , Huang Min
Published: November 2011

Each transport mode owns itself technical economy. On the basis of multiple transport mode selection, the paper presents the route optimization model for single-task from one origination to one destination in the fourth party logistics, and gives the solution of Genetic Algorithms. In the algorithms, a length-variant encoding scheme of round number is adopted to represent the selected route, and idea that keeps the best individual is used. The results of experiments show that Genetic Algorithms can solve the route optimization problem based on the selection of multiple transport modes in the fourth party logistics conveniently and effectively.
Numerical Simulation of Fluid Transients in Servo-Controlled Hydraulic Piping
Authors: Mu Dong Jie , Li Chang Chun
Published: November 2011

His analytical model is carried out based on the one-dimensional fluid transient theory. In view of the micro-compression of the fluid can change its momentum in the transient process, an improved fluid dynamic model of pipeline is proposed. The characteristic method and the finite difference method are adopted for this simulation. In this paper, The fluid transients of the pipes after servo valve shut down are analyzed. The correctness of the simulation is approved by the comparison of calculation data with experiment data .The results showed that these models give more reasonable descriptions for water hammer and flow oscillation during servo valve starting process and could provide guidance for designs and experiments of the hydraulic pipe system
Analysis of Snubber Circuit Parameters Based on an Excitation Controlling Circuit
Authors: Gao Wei , Zhang Jun Hong , Wu Xu Sheng , Zhao Jing Hong
Published: November 2011

In an excitation control system of some DC generator, there are accidents sometimes thanks to the snobbery unit. To solve these bothersome, based on an snubber unit of the excitation control circuit, namely a Buck converter topology with rectifier bridge, with the filter capacitance and the exciting winding impedance parameter assured, the preferences of the resistance and capacitance of the snubber circuit is investigated by simulation. The result is that it can limit the switching-on peak current of the switch when the snubber resistance and capacitance’s parameters are increased suitably, and the former one can lose more energy on the snubber resistance, then the latter one can reduce the striking current in the snubber resistance at the switching-on time. Finally, the simulation results are provided to verify that the exact selection of the snubber resistance and capacitance’s parameters can make excitation controlling circuit more stable and reliable.
Strategy and Implementation of System Performance Optimization
Authors: Qu Feng Juan , Zhao Hui , Yuan Quan Bo
Published: November 2011

Currently in various fields systems are widely used. With the increasing of visitors, the number of concurrent processes raise as System response. In order to ensure system stability for business support, this article analyses data management strategy, database design strategy, application server design strategy, web server design strategy, and implements the enhancing system performance.
Modeling and Simulation for Boost Converter Based on HDS Theory
Authors: Ma You Jie , Liu Si Jia , Zhou Xue Song , Tian Cheng Wen , Liang Fang
Published: November 2011

As a typical power electronic circuit, the dynamic model of boost converter can be viewed as a mixing or interacting system between the discrete event and continuous time variable, also known as hybrid dynamic systems. By using of hybrid dynamic systems theory, a hybrid model of boost converter was established and simulation was carried out to verify the validity of the method in the MATLAB. Compared with traditional state-space averaging method, a more accurate model of boost converter was obtained without treatment of approximate linearization based on hybrid dynamic theory.
Modeling of Active Flexible Suspensions by Mobility and Transfer Matrix
Authors: Niu Jun Chuan , Guo Hao Nan , Li Meng
Published: November 2011

For simplicity and not losing generality, a half-vehicle model with 4 rigid DOFs is presented by mobility or impedance method and transfer matrix technology, which bring the flexibility of the body to the proposed model easily and conveniently, instead of complex differential and state space equations. Based on the multi-objective optimization, a synthetic cost function is proposed to investigate the dynamic characteristics and achieve the optimal control of suspensions. The numerical examples are performed to show the validity and efficiency of the presented model, and some valuable conclusions are also obtained to guide the optimal design of suspensions.
Study on Modeling and Simulation of Digital Factory Technology in Complex Production Development
Authors: Li Shan , Wang Yan En , Chen Bing , Yang Ting , Dong Qian Li
Published: November 2011

This paper describes an innovative systematic approach to factory automation. Northwestern Polytechnical University developed an Enterprise-level Digital fActory and its Simulation Platform, NPU-EDASP that adopted service-oriented architecture methodology to design and develop this software. In particular, it specifies the simulation technology within the NPU-EDASP platform to bridge the gape exits among products and production manufacturing process. In an advanced stage, simulation technology can be applied in the NPU-EDASP to enhance the operative production planning and control. Further, the combination of simulation and optimization techniques will improve and optimize material flow, resource utilization and logistics in production engineering processes. A case study of a model demonstrates that the NPU-EDASP digital factory offers an integrated approach to promote the ability of production engineering.
The Operating Point Determination of Special Turbine in Cooling Tower
Authors: Li Yan Pin , Ren Yan , Yue Gao Feng
Published: November 2011

This article introduces the theory analysis and experimental study on the performance of special turbine in cooling tower. The author analyses the speed-flow characteristics of turbine-fan unit and the speed-flow characteristics of ultra-low specific speed turbine itself. At the same time the author points out the principles and methods to determine the best operating point of turbine-fan unit. So it is very important to determine whether the specific turbine is in the best condition.
Aircraft Landing Gear of a Dynamic Research and Computer Simulation
Authors: Li Shen Shou , Liu Xiao Ming , Zhu Zhong Gan , Yang Fang
Published: November 2011

by the MSC Adams / Aircraft software features, setting pillar-type landing gear as the prototype, and using ADAMS software modules prior to the establishment of a certain type of aircraft landing gear model, then calculate the air buffer spring force oil, damping force and the structural constraints force curve based on dynamics model, At the end of paper we will analyze the model drop-test results. The results proved that we used this method was feasible.
Lack of Oil of Oil-Paper Capacitive Bushing Damage and its Judging Methods
Authors: Wang Tian Shi
Published: November 2011

The function of components and the theory of oil-paper capacitive bushing are introduced by analyzing its contracture, and the electric properties of insulation materials are instructed. The reasons and damages of lack of oil are proper illustrated, and the judging methods are offered. The distinguishing process of lack oil of bushing is illustrated by examples, and the accuracy and rationality of lack of oil finding by capacitive volume, dielectric loss angle, oil chromatogram analyzing and infrared ray test are demonstrated.
Study on Regulating Reservoir Changing Water Resource Value Mechanism
Authors: Zhang Ze Zhong , Xu Jian Xin , Li Yan Bin , Qi Qing Qing , Huang Qiang
Published: November 2011

In order to understand the impact of reservoirs to water resource value more scientifically and rationally, and based on expatiating the study of water resource value theory, this paper reveals the mechanism of regulating reservoir changing water resource value, by some physical theory such as momentum and kinetic energy theory, as well as resource scarcity theory. It is that the reservoirs transfer the relative control pivot’s labor value to the flowing water resources, and change the scarcity value of regulating water resources, by dam working on regulating water resources. The paper provides a scientific basis for regulating reservoir obtaining compensation benefits.
Research on Fault Diagnosis of Certain Armored Vehicle’ Gear-Box with IMF’s Energy Moment
Authors: Wang Chuan Fei , An Gang , Yang Fan Jie
Published: November 2011

Aim at the non-stationary and time-variation characteristic of the gear-box fault signal, proposing a condition identify method for gear-box based on EMD and NN. Take the vibrating signal of case as the analysis object, firstly, deal the signal with EMD, extract the IMFs’ energy moment as eigenvector, through neural network based on L-M optimization algorithm to identify gear-box fault. The result of testing certain armored vehicle reveals that method can identify a variety of conditions of gear-box effectively, and provides a availability intelligence fault diagnosis method for gear-box.
Structure Reverse Design and CFD Analysis on Agitated Flow Field of Submersible Mixer
Authors: Xu Wei Xing , Fan Ming Yue
Published: November 2011

The impeller of submersible mixer in some sewage treatment plant, whose parts are imported from other countries, is heavily abased. To solve this problem and realize domestic manufacture, based on reverse engineering theory, utilizing 3 coordinates measuring machine and applications of Surface and Pro/E, 3D solid model of impeller are gained. The gained impeller model accords with the physical one with high accuracy. The flow formulation is founded as console formulation first, and with the body-fitted coordinate system and standard turbulent model, the numerical simulation of the internal 3-D incompressible turbulent flow agitated flow field of submersible mixer is carried out by numerical simulation software Fluent. The results showed that: the mixer impeller produced vortex jet flow, the constant velocity lines advanced as ellipse, the velocity along the centerline are larger than others, and utilized volume flow to transport the liquid.
The Remote Warning and Diagnosis System for CNC Machine Tools
Authors: Chen Zhang Rong , Li Yun Fei
Published: November 2011

To meet the practical demands of some firms making CNC machine tools, a remote warning and diagnosis system is designed and introduced in this paper. The on-site information collection and communication module which is used to monitor the equipments can predict the failure before it occurs and send the data to the information center. It helps to reduce the failure and efficiently prevents serious accidents from happening. The advantage of the system is that it improves the remote service and repair, which makes it important for the designing of the remote monitoring system for large-scale mechanical and electrical integration products such as central air conditioning and elevator.
Study on Energy-Saving of Urban Water Supply System Variable Frequency Pumping Station
Authors: Li Hong Yan , Yue Xiu Ping
Published: November 2011

Energy is an important material foundation for developing the national economy and improving human living standards. We discussed the energy-saving principle of urban water supply system variable frequency pumping by analyzing the urban water supply and water pumping station curves, further studied the best speed and flow adjustment range of the Urban Water Supply Systems Variable Speed Pump, from both economic and efficient operation of pumps taken into account to determine the best number of the speed pump sets, which can be referenced for the design of urban water supply system variable frequency speed pump station.