bluuebunny/crossref_metadata_2025 huggingface dataset:
Research on BIT Intelligence Maintenance Decision of Weapon Materiel
Authors: Huang Jian Xin , Bian Ya Qin
Published: October 2011

Considering the weapon materiel maintenance condition, intelligence theory and method such as expert system and neural network is introduced in BIT technology. BIT intelligence maintenance decision in materiel maintenance field is discussed. The realization of materiel intelligence BIT reflects the concurrent design concept of system exploitation. Level integrated intelligence BIT system organization framework is adopted. BIT comprehensive decision-making and maintenance expert system structure is designed, and its implementation plan based on BIT is offered, which can enhance the fault diagnosis capability of modern complicated weapon materiel.
Study on Technology of Human Body Surface Reconstruction Based on Reverse Engineering
Authors: Jing Xiao Ning , Li Xiao Jiu
Published: October 2011

This paper describes the concept of reverse engineering and the workflow of reverse modeling software — imageware. Using the powerful function of point cloud data processing in imageware, it achieves point cloud data pre-processing, point cloud segmenting, contour curve fitting and surface reconstructing of the human body. Finally, it makes the error evaluation of the surface model. This study may provide original design basis for related research.
Analysis of Copper Wires Residues in Fire Investigation
Authors: Wu Ying , Han De Cai
Published: October 2011

The in-depth composition of carbon and oxygen in copper beads formed by arc and fire were studied by XPS, respectively. Corresponding to the sputtering depth, the molten product on an arc bead surface layer is with drastic decrease of carbon content and with gentle change of oxygen content which then rapid decreases. While the molten product on a fire bead surface layer is with carbon content decreasing gradually and with oxygen content increasing. As a result, the distributing of C and O and the quantitative results can be used to identify the molten product on a bead induced directly by arc and the molten product on a bead formed by fire, as complementary technique for judgments of fire cause.
Primary Modeling and Survey of 4H-SiC Based Metal-Semiconductor-Metal Ultraviolet Sensor with Novel Electrode Structure
Authors: Chen Bin , Yang Yin Tang , Xie Xuan Rong , Wang Ning
Published: October 2011

4H-SiC based semicircular electrode metal-semiconductor-metal (SEMSM), triangular electrode MSM (TEMSM) and conventional electrode MSM (CEMSM) ultraviolet (UV) sensors have been modeled, investigated and characterized with numerical simulator ISE-DESSIS. By comparing with relevant experimental data, the model correctness is verified. The electrical and optical features of these sensors are simulated and calculated to character the effect of the novel electrode on performance enhancement. In contrast to CEMSM device, the SEMSM and TEMSM sensors show an outstanding superiority in terms of higher photocurrent, comparable low dark current and excellent quantum efficiency. At a bias of 30 V, the dark currents of SEMSM and TEMSM sensors are below 3.5 pA and the photocurrents are 20.7 nA and 23.7 nA under 310 nm UV illumination, respectively. Furthermore, the peak responsivity is estimated to be larger than 0.135 A/W, 0.156 A/W at 290 nm and maximum quantum efficiency at 280 nm is 58.8% and 67.7% for semicircular and triangular electrode structure, respectively.
Surface Roughness Measuring System Design for Cutting Workpiece Based on Machine Vision Technology
Authors: Zhu Ming , Zeng Qi Yong , Wu Kai , Hong Tao , Zheng Xiao Feng
Published: October 2011

A new method for workpiece surface roughness measuring system based on machine vision technology was designed. A Charge-coupled Device （CCD） camera was used to take workpiece surface image. Then median filtering, image enhancement and image binarization techniques were used for image preprocessing. And then useful information was extracted from image characteristic parameters. The surface roughness of cutting workpiece was calculated out. Researching emphasis was focused on the hardware design and software programming of the main two parts, image acquisition module and image processing module. This measuring system was used to measure cutting workpiece surface roughness, and perform very well.
Adaptive Sliding Mode Controller Design for a Nonlinear Inverted Pendulum with Unknown Physical Parameters and its Experiment
Authors: He Qing , Liu Jin Kun
Published: October 2011

In this paper, an adaptive sliding mode control (ASMC) method for a single inverted pendulum (IP) is proposed. The physical parameters are transformed into the model information, thus adaptive law for the IP can be designed with unknown physical parameters. By simulation and experiments, we found that the ASMC method can keep the IP in the upright position, with quick parameters adjustment and high degree of system robustness.
Algorithm Research of Cutter Location Path for Five-Axis NC Machining Based on Equal-Parametric
Authors: Chen Wen Tao , Xia Fang Chen , Tu Hai Ning
Published: October 2011

On the base of equal-parametric method, this paper presents a new algorithm of adaptive step lengths on parametric coordinate system. The algorithm considers the radius of the curvature difference between different cutter contact points.To meet the premise of precision and roughness ,the algorithm have optimized cutter attitude, planning cutter location path generation for five-axis machining.This algorithm is suitable for machining sculptured surface.
The Application of Multiple Attribute Decision Making on Radio Signal Searching
Authors: Liu Guan Hua , Yi Liang Zhong , Pei Zheng , Hu Da Li
Published: October 2011

The traditional algorithm of searching a new radio signal is not from the nature of the signal, but from the simple statistics and four arithmetic operation. So, there must be a big gap to decide which signal is a abnormal signal. This paper draws the innate character of the signal and then uses the ordered weighted averaging aggregation operators (OWA) and k-means to deal with the datum. The signal type is decided by multiple attribute decision making (MADM). The result of experiment show the method is effective.
The Detection of Soil Parameters by Portable near Infrared Spectrometer
Authors: Li Yu Fei , Wang Da Cheng , Zhang Dong Yan , Zhu Da Zhou
Published: October 2011

Soil test is the key-point for formulated fertilization. The traditional chemical analysis methods for estimating soil nutritional parameters were time-consuming. The present aims to use portable acousto-optic tunable filter (AOTF) near-infrared (NIR) spectrometer to measure soil parameters, thus provide basis for field analysis of soil quality. A total of 231 soil samples were collected, Partial least squares (PLS) was used to construct the calibration model between the NIR spectra and the reference values measure by standard chemical methods, including organic matter, pH, ammonium nitrogen, nitric nitrogen, and total kalium content. Results showed that the prediction of organic matter and pH had high correlation (R=0.8745, R=0.8594, respectively), the prediction of ammonium nitrogen and total kalium content were acceptable (SEP%=23.2595%, 10.1516%), and the calibration model for nitric nitrogen had the worst performance. The present study indicated that portable AOTF-NIR spectrometer could be used to measure the nutrient parameters of soil.
The Study of Low-Power Consumption Heat Meter Based on MSP430
Authors: Zhao Wei Guo , Zhao Xue Song
Published: October 2011

A low-power consumption heat meter with long-distance communication was designed based on MSP430F413 and TDC-GP2. The new flow measurement circuit and correction method were introduced in detail, which improved the accuracy of the heat meter effectively. In order to reduce the power consumption, the running time of the CPU was minimized, the floating-point operation was avoided, and the communication circuit was designed specially. The experiments showed the design is valid.
A Cooperative Co-Evolutionary Controller for AC Induction Motor
Authors: Sun Jian , Wang Qiang , Xiao Jian Xiu
Published: October 2011

Considering the nonlinearity and strong coupling of AC induction motor, a co-evolutionary control method is proposed for it，based on this method, distribution function is introduced to regulate the probabilities of individuals production to promote the speed of evolutionary according to the characteristic of control system . Compared with the traditional genetic algorithm, the searching space has been decreased greatly by the method. Furthermore, tested on AC induction motor, the controller in this paper has the traits of high-speed response and small overshoot so on.
A SPWM Control Method for Dual Buck Half Bridge Inverter Based on the Direction of Inductor Current
Authors: Zhang Xian Jin , Song Yong Xian
Published: October 2011

The Dual Buck Half Bridge inverter has been widely researched because of no bridge arm shoot-through problem and higher efficiency. Because the switch frequency always varies, the output filter parameters are very difficult to optimally design by using hysteresis current control. In this paper, a SPWM control method is proposed. The control method not only can be easy realized, but also get the no-biased current model. Finally, the proposed SPWM control method is verified by the simulation and experiment results.
A Study on an Effective Motion Tracking Algorithm
Authors: Gao Li
Published: October 2011

Moving objects tracking in video sequences are the fundamental and challenging research topics in computer vision area at present. They have great research and application values in modern industry, military, avigation and spaceflight area. But so far robust object tracking is still an open problem especially when the scene is complex. The main obstacles in the research are the scale of object, occlusion, background complexity and other non-rigid deformation. The system presents an integration of Kalman prediction [1] and Mean-shift [2] tracking method. A large number of experimental results show that the proposed tracking algorithm not only can improve the reliability and accuracy which traditional tracking algorithm cannot, but also can improve the real-time performance which SIFT tracking algorithm fails.
Application of Disturbance Rejecting Fuzzy Controller in Electric Arc Furnace
Authors: Liu Xiao He , Zhao Zhi Jian
Published: October 2011

In this paper, the design of a disturbance rejecting fuzzy controller (DRFC) is applied to the electric arc furnace electrode regulation system. In order to improve traditional PID which is slow response and vulnerable to disturbance, we introduce two model reference fuzzy adaptive control mechanism, one of which is designed to improve response speed and reduce the sine disturbance of the length of arc, and the other of which is designed to reduce the current coupling random disturbance. Simulation results showed that by using a DRFC can acquire better dynamic characteristics in the electric arc furnace electrode regulation system, and has stronger suppression capacity.
Direct Torque Control of Permanent Magnet Synchronous Motor Based on Fast Terminal Sliding Mode
Authors: Zhang De Jiang , Zhang Niao Na , Wang Yong Qing , Liu Ke Wei
Published: October 2011

To solve the problems of large flux linkage and torque ripple, difficulty to accurately control at very low speed in the conventional direct torque control (DTC) of permanent magnet synchronous motor (PMSM), the chattering free fast terminal sliding mode (FTSM) control is introduced into the PMSM DTC. The proposed control scheme not only preserves fast torque response merit, but also associates with the high robustness of terminal sliding mode. It can drive torque ripple to converge to the equilibrium point in finite time, reduce steady state error, has stronger robustness to motor parameter and disturbance,and it attenuates the chatter. This stability of system is proved by Lyapunov theorem in this paper. The simulation results are presented to the feasibility and effectiveness of this method.
Fuzzy Control System of Titanium Dioxide Hydrolysis Process
Authors: Zhou Rong Fu , Shuai Ding Xin , Tang Yu , Zhang Xue Tong
Published: October 2011

Hydrolysis process is the key part of sulfuric acid method’s production technology of titanium dioxide, it is also the most rigorous part of the process control, and precipitate out the white hydration precipitation TiO2 from the mother liquor, and separate from other soluble metal sundry ions, further purify the TiO2. The quality of hydrolysis product not only affects the normal operation of the follow-up, but also affects the quality of the final product directly. This article do some study and design to the hydrolysis automatic control, use computer，DCS and PLC control the hydrolysis operation process, temperature control, steam heating system, That means comprised monitoring station by the DCS，CRT, mouse and keyboard replace the simulates panel and operator, and use the fuzzy theory control the hydrolysis temperature rise process, improve the accuracy and precision of the operating, at the same time, reduce the labor intensity of the workers, realize the automatic control of the hydrolysis process, stabilize and improve the product quality effectively
Fuzzy Depth Control of Small Cylindrical Object Navigating near Free-Surface
Authors: Shao Zhi Yu , Chen Yun , Fang Dong Yang , Feng Shun Shan
Published: October 2011

Small cylindrical object navigating near free-surface is subject to wave disturbance. Wave disturbance can dramatically influence the depth control of the near-surface navigating object. A self-regulating fuzzy depth control method is proposed to keep the small cylindrical object navigate at the expected depth under free-surface disturbance. The near-surface dynamic model of the cylindrical object is presented and the fuzzy depth control method is modeled. The results obtained by a series of hardware-in-loop simulations demonstrate that the self-tuning fuzzy depth control method is valid to keep the small cylindrical object navigate steadily in the expected depth under free-surface disturbances.
On-Line Fault Intelligent Monitoring Diagnosis System of Blower
Authors: Zhou Rong Fu , Shuai Ding Xin , Tang Yu , Zhang Xue Tong
Published: October 2011

The structure of gas blower group is complex. There are many types of fault and many fault are hidden, such as axial channeling move, rotor rubbing, resonance of sliding bearing oil film, gear fault , unbalanced, misalignment .etc. The happening of these kind of fault, will affect seriously the efficiency and safety of operation of the gas blower, leading to the paralysis of the production system. Therefore, it is necessary to design an On-line fault intelligent monitoring diagnosis system for gas blower group as soon as possible. When on-line monitoring , at the same time ，the computer in the background online real-time analysis all kinds of dynamic vibration signal automatically, discriminate the operating status of these blower group, depend on consequence of all kinds of analysis , by intelligent reasoning, online real-time display fault type, the cause, site and severity. Can also be offline man-machine interactive for intelligent diagnosis precision.
Partial Discharge Pattern Recognition of Power Transformer by Using Information Fusion
Authors: Chen Xin Gang , Zhao Yang Yang , Zhang Chao Feng , Tian Xiao Xiao
Published: October 2011

As one of the most important equipments in the power system, partial discharge (PD) affects the transformer’s properties in a long-term period and the partial discharge pattern recognition has most important sense. In the paper,3 kinds of experimental models simulating discharges were designed and model experiments were performed. Based on this, a transformer partial discharge pattern recognition system based on information fusion technology is developed. the finally experiments show that: information fusion have enough ability to recognize different types of partial discharge.
Research and Implement of Measuring the Errors of Transformers with Actual-Burden Using Programmable Digital Synthesizing Three-Phase Power Supply
Authors: Lu Yong Jun , Lu Yi Bo
Published: October 2011

Monitoring the actual state of transformer is imperative for measuring the errors of transformer with its actual burden load. The simplified three phases testing method is the practical and effective in monitoring the transformer state. And a programmable three-phase power supply is its core. The three-phase programmable power supply using DDS synthesizer can change the phase angle through changing triggering time of frequency update and adjusts amplitude through multiplier. It can generate three-phase signal voltage whose amplitude and phase angle can be adjusted by program. So it is suitable for the instrument for measuring the errors of transformer with its actual burden load. By using the instrument an environment of actual burden load is simulated completely. So the measuring of transformers with actual burden load is made precisely. The measuring principle and hardware and software design of the instrument are discussed in the paper.
Investigation on the Electric-Field-Induced Metal-Insulator Transition in VoX-Based Devices
Authors: Wang Qi , Zhang Kai Liang , Wang Fang , Song Kai , Hu Zhi Xiang
Published: October 2011

A sandwich device structure of MIM (metal/insulator/metal) is designed and its metal-insulator transition induced by an external electric field is investigated. VOxfilms were deposited on several different substrates by dc magnetic sputtering at room temperature. The device of Pt/VOx/Cu/Ti/SiO2/Si exhibited steady bipolar resistance switching behaviors between high resistive state (HRS) and low resistive state (LRS) with-0.4V/0.3V operation voltage (SET/RESET), while the devices of Pt/VOx/V/Cu/Ti/SiO2/Si, Pt/VOx/Al/Ti/SiO2/Si and Pt/VOx/Pt/Ti/SiO2/Si didn’t show this steady characteristic. From the comparison of these devices based on different substrates, the Schottky Emission model was quoted to explain this resistance switching characteristic in Pt/VOx/Cu/Ti/SiO2/Si device.
Research on Non-Linear Decoupling for Multi-Dimensional Force Sensor
Authors: Zeng Yi Shan
Published: October 2011

Based on the integrated design of structure, multi-dimensional force sensor has severe dimension coupling interference. Besides, two-order non-linear coupling error exists generally. This paper focuses on a six-axis force sensor of strain gauge balance, and uses a P normative decoupling network to compute the decoupling matrix. Then the static non-linear decoupling parameters are solved by multi-step least square so that the morbidity in the process of computing the decoupling matrix is avoided.
Videogrammetric Measurement for Model Displacement in Wind Tunnel Test
Authors: Zhang Zheng Yu , Wang Shui Liang , Sun Yan
Published: October 2011

It is crucial measuring position and attitude of model to gain the precise and accurate data in wind tunnel tests. The model displacement videogrammetric measurement (MDVM) system and its key techniques such as the exterior orientation with big rotation angles and large-overlap, mark points, image processing and calibration based on the known distances are therefore presented. The practice example in Asia's largest (2.4m) transonic wind tunnel has demonstrated the MDVM system and its key techniques are correct and feasible, and they have application value.
Study on the Effect of ZnO Buffer Layer Thickness on the Properties of MgZnO Film
Authors: Dong Xin , Wang H. , Wang J. , Shi Z.F. , Zhang S.K.
Published: October 2011

ZnO has recently attracted considerable attention due to its favorable properties such as the wider band gap (3.37eV) at room temperature, the large binding energy of excitons (60meV). These good photoelectric and piezoelectric properties [1-4] cause it has immensity space for developing at surface acoustic wave devices, light emitting diodes (LEDs) [5] , photodetectors [6], gas sensor and solar cells [7] etc. MgZnO has many similar properties to ZnO. Furthermore, the band gap of MgZnO is 3.3-4.0eV [9] due to the wider band gap of MgO (7.7eV [8]). In this paper, we report the characteristic of MgxZn1-xO films which were grown on c-plane sapphire with different thickness-ZnO buffer layers by MOCVD. By investigating the surface morphology, structural and optical properties, some dependences between properties of MgZnO films and the thicknesses of ZnO buffer layers can be found.
Energy Saving Design of Personal and Consumer Electronics Products
Authors: Ni Nan , Huang Hai Hong , Liu Zhi Feng , Liu Guang Fu
Published: October 2011

Personal and consumer electronics products facilitate and enrich our life, however consume lots of energy and resources. Synthetically considering a product's quality, functions, cost, schedule and user experiences, this paper systematically discusses how to design energy saving product and lists some methods and actions in practice from three aspects, hardware design, user interface design and software design. It is of guidance and reference for energy saving design of personal and consumer electronics products on certain aspects.
Isolation Performance Evaluation of Compressor Vibration Isolating Systems Based on LMS Test. Lab Signature
Authors: Zhang Li , Chen Hao , Gong Yan Jue , Wu Hong , Zhang Shuo
Published: October 2011

In order to reduce vibration and noise of the compressor used in small and medium-sized refrigeration unit, this paper designs different vibration isolating systems and carries out experiment of isolation performance evaluation based on LMS Test. Lab Signature software. The comparison results of four different vibration isolating systems show that the peak values of vibration velocity response in each system mainly appear at 25Hz, 50Hz, 75Hz and 100Hz, and the maximum velocity does not exceed 22mm/s which is less than the maximum allowed by the national standard[1]. And the Vibration Level Difference (VLD) is taken as evaluation criteria for isolating vibration, that of single-layer vibration isolating system is within 10-20dB, and that of double-layer vibration isolating system is within 20-35dB. Furthermore with the increase of middle-mass, the VLD has a clear upward trend.
Effects of Aperture Amount and Offset on Couplings of Strong Electromagnetic Pulse
Authors: Zhu Xin Ping , Cao Bing , Liu Cheng Long
Published: October 2011

Aperture coupling is a main coupling mode through which strong electromagnetic pulse can disturb and even damage electronic equipments. The amount, offset and mixed shape of aperture arrays can affect the coupling effect, which is analyzed using finite-difference time-domain (FDTD) method. The field strength coupled increases with the decrease of the slot amount when the total area of aperture is unchanged. The shielding effectiveness is the smallest when the electromagnetic pulse reaches the resonant frequency, which is only affected by the actual structure size of the shielding cavity. Comparing to two direction offset, the single achieved much larger field strength, which is symmetrical about offset center. The coupled field strength is the smallest when the shape of aperture arrays contains round and rectangular.
Feedback Linearization for Sliding Mode Control of CNC Electromagnetic Levitation System
Authors: Zhang Yu Zeng , Wan Ren Yi , Chen Zhuo Jun , Wang Yun Tao
Published: October 2011

In this paper, the levitation rigidity for the levitated crossbeam of the gantry numerical control machine tool which can eliminate friction and increase machining precision is discussed. The feedback linearization and sliding mode control methods are presented in this paper in order to achieve steady levitation. The nonlinear electromagnetic levitation system is transformed into linear system by using feedback linearization method. The sliding mode control method is adopted for improving the robustness of the levitation system. Simulation results show that the system has more powerful ability of suppressing disturbance and high rigidity compared with that using conventional PI control method.
The Electromagnetic Compatibility Design of Restrained Image Transmission Equipments
Authors: Yang Xu , Song Lu , Wang Wei
Published: October 2011

In order to improve the quality of image transmission, this paper puts forward a box shielding method that could eliminate electromagnetic interference signal on image transmission equipments. At first, this paper analyzes the shielding effectiveness of electromagnetic interference, selects the qualified shielding material and designs the structure. After that, it analyzes the descending of shielding effectiveness in the operational system, and improves the equipments shielding effectiveness by means of the electromagnetic compatibility design that accords with electromagnetic compatibility norms. At last, through the EMI radiometry, this paper confirms that the equipments are in accordance with the design requirements of electromagnetic compatibility norms.
Design and Analysis of Ultra-Low Speed Movement Equipment System
Authors: Dai Feng Yan , Ji Wen Gang , Cao Jian Shu
Published: October 2011

Czochralski lifting device is the key equipment for crystal growth. Due to laser crystal growth mechanism could decide its slow growth speed, so Lifting device is required to operate under the ultra-low speed situation chronically. According to shock, shake, fraction and crawl of movement system affected speed stability, the paper carries out a nobel design to laser Czochralski lifting system through alternated servo technology and its precision is analyzed comprenshensively. The long-term experimental data showed by using changed plus PID control method that the system has high precision and better reliability and it is suitable to grow large-size laser crystal. Meanwhile, the design system makes use of common spare parts and can meet the requirements for large scale industrialization.
Application of Synchronous Rectifiers in Power Supply for Unmanned Aerial Vehicle
Authors: Chen He Na , Zhang Yi Ming , Wang Hai Juan
Published: October 2011

Power supply for Unmanned Aerial Vehicle (UAV) low voltage, high current output, so conventional diode rectifier circuit had been unable to meet the high efficiency in switching power supply, which should selected synchronous rectification (SR). But conventional gate charge retention drive existed dead time and constant drive voltage problems. In this paper, proposes a new gate charge retention drive to improve the phenomenon. Using Saber to analysis the two methods, we could verify the accuracy of the theory. Finally, 72v input 6v/20 output forward converter are designed using the new methods and 90% efficiency is achieved at full load.
Study of Large Scale Measurement Method Based on Leapfrog Principle
Authors: Zheng Long Jiang , Li Xue , Qin Ling Ling , Chen Hong Bin , Gao Xue , Yuan Rui Rong
Published: October 2011

At present，large scale and space coordinates measuring system with wide-range and high-precision has been widely used in modern manufacturing industry. In this paper, large scale measuring method based on leapfrog principle of flexible three coordinate measuring machine is described. The mathematical model of coordinate transformation is built and the general coordinate transformation formula after number of times leapfrogging is derived. The best positioning and each step of leapfrog are given.
Key Technologies Related to High Vacuum Dry Pump
Authors: Li Jie , Gan Shu Yi , Liang Ping , Dai Jia Xin , Chen Da Peng , Zhao Teng
Published: October 2011

High vacuum dry pump is a typical technology-intensive mechatronics product. It is mainly composed of a specially designed gas-pumping structure and a set of very complicated electronic control system. Taking place the conventional dry pump unit, this pump can used in many hi-tech area such as semiconductor industry where oil-free high vacuum is needed. This paper introduces two types of dry pump, including their structures and performances. Some key points related to the development of the pump are intensely discussed as well.
Numerical Simulating for Pulverized Coal Combustion and SNCR Reaction Process
Authors: Xu Jiang Rong , Wang Jun , Ming Chen Kui
Published: October 2011

In this paper, a simple combustion facility was simulated numerically with FLUENT code to investigate the process of coal combustion, NOx formation, and SNCR for NOx removal. The influence of the temperature and ratio of NH3/NO on NOx removal efficiency was researched by the numerical simulating of SNCR process. The simulation results are helpful for the optimization design of SNCR system.
A Methodology for Deliberating Prediction Criteria
Authors: Lim Chia Yean , Khoo Vincent K.T. , Belaton Bahari
Published: October 2011

The economic downturn has been forcing many companies to use predictive analysis for spotting emerging product and technology trends and also future customer needs. Since every company is unique, without the assistance of some methodologies and tools, decision makers encounter great difficulties in conducting predictive analysis, especially in the deliberation and prioritization of new prediction criteria derived from the publicly available unstructured information. This paper proposes a unique methodology which attempts to integrate the personalization and visualization of new prediction criteria. The challenging iterative tasks are achieved through a rule-based inconsistency detection triad-based comparison algorithm, supported by sophisticated visual displays of the relative importance among the prediction criteria. It is hoped that the proposed methodology will intuitively support the decision makers in exploring and deliberating new criteria for making better predictions.
Optimization Design of Heterogeneous Injection Mold Cooling System
Authors: Ren Li , Zhang Wen Xiao
Published: October 2011

For the cooling system of plastic injection mold affects significantly the productivity and quality of the finial products, the cooling system design is of great importance. In this paper, considering the location, size, number of cooling channels and mold material properties, the optimization design of heterogeneous injection mold cooling system is discussed to achieve simultaneously fast and uniform cooling. A mathematical model is constructed in which the part temperature distribution uniformity and production efficiency are taken as the objective function for cooling system design of heterogeneous injection mold. For the reason of the non-linearity of design problem and the coupling of geometric with material variable, the design problem is divided into two sub-problems and the combining algorithm is used in such way that, the geometric optimization sub-problem is solved by Hooke-Jeeves method and the material optimization sub-problem is solved by particle swarm optimization (PSO) method. The effectiveness of the approach is illustrated by a design example of injection mold cooling system.
Temperature Field Analysis of Dispensing Jet Based on GMA
Authors: Zhang Shi Jun , Deng Gui Ling , Zhou Can
Published: October 2011

In the dispensing jet based on GMA,current in the coil produces a large amount of heat,which affects the glue viscosity and magnetostriction constant and other parameters, and so bringing about poor quality dots, therefore, it is necessary to analysis the transient temperature field of jet dispenser .This article mainly discusses the transient simulation of temperature field of jet dispenser by means of the MSC·MARC software, then in contrast with the experiment results to master the laws of temperature, so as to take appropriate control measures in future.
Inverse Identification of Heat Boundary Conditions for 2-D Anisotropic Coating Structures
Authors: Zhou Huan Lin , Han Hu Sha , Cheng Chang Zheng , Niu Zhong Rong
Published: October 2011

The singular value decomposition is employed to identify heat boundary conditions for 2-D anisotropic coating structures. The boundary element method is applied to analyzing the model. The nearly singular integrals in the boundary element method for thin body problems are dealt with by the analytical integral formulas. The ill-posed system is treated by the truncated singular value decomposition technique. Numerical example demonstrates the effectiveness and accuracy of the present algorithm.
Preparation and Characterization of Injectable Hybrid Hydrogels Based on Photopolymerziaton
Authors: Wei Hong Liang , Zhao Zi Xuan , Chu Hui Juan , Zhu Jing
Published: October 2011

In this study, bentonite/polyacrylamide hybrid hydrogels were prepared via free radical polymerization of acrylamide (AM) with photocurable poly (ethylene glycol) dimethacrylate (PEGDMA) as cross-linkers under UV irradiation. The structure of the hydrogels was characterized by FTIR, DTA techniques. Both single factor and orthogonal design experiments were adopted to investigate the swelling kinetics of the hydrogels. The effect of AM, PEGDMA, bentonite, photoinitiator on the swelling ratios was studied in detail. The as-prepared hydrogels could find a lot of applications in biomaterials.
Study on Combine Harvester Speed Control Based on Optimum Threshing Power Consumption Model
Authors: Chen Du , Kang Feng , Zhu Qing Yuan , Wang Shu Mao
Published: October 2011

Combine harvester have to be operated in a wide range of field condition which may induce varying feeding rate. Forward speed is a main variable to control the feeding rate of combine harvester for high efficiency. In this study a control strategy based on optimum threshing power consumption model was developed and integrated into a speed control system for combine harvester automation. A conventional self-propelled combine harvester (Xinjiang-II) was equipped with multiple sensors to collect online information, including forward speed, threshing drum torque and speed. Forward speed was then adjusted by an electric-hydraulic unit based on designed PID controller to achieve an optimum range of threshing power consumption. Field test was conducted to evaluate the performance of the controller under variable feeding rate condition. From obtained results, the controller can improve the efficiency of tested machine during field operation.
A NURBS Interpolator Using Multiprocessor on Chip for High Performance Motion Control
Authors: Tang Wei , Zhang Xiao Dong , Ding Yong , Jing Jing
Published: October 2011

Modern CNC system adopts the NURBS interpolation for the purpose of achieving high-speed and high accuracy performance. However, in conventional control architectures, the computation of the basis functions of a NURBS curve is very time consuming due to serial computing constraints. In this paper, a novel multiprocessor-based motion controller on chip utilizing its high-speed parallel computing power is proposed to realize the NURBS interpolation. The motion control algorithm and I/O control are also embedded in the chip to implement real-time control and NURBS interpolation simultaneously. The experimental tests using an X-Y table verify the outstanding computation performance of the multiprocessor-based motion controller on chip. The result indicates that shorter sampling time (0.1 ms) can be achieved for NURBS interpolation and high-accuracy motion control.
Wheeled Crane Hybrid Power Control System Design
Authors: Zhou Xin Min , Zhou Dong Xiang
Published: October 2011

This paper analyses the key point of energy saving in the Wheeled Crane hybrid power system. The scheme of 25T Wheeled Crane hybrid power system is designed based on supercapacitor. DSP, PLC and Touch panel is used as the control center of the system. The design of main circuit, measurement system, PLC system and system communication and coordinate control is discussed. Finally, main circuit and system experiment results are presented. Experiment shows that this system may save energy 30% or above.
Application of the Wavelet Transform for Defect Detection in Prestressing Strands by Guided Wave Technique
Authors: Xu Jiang , Xiong Hong Fen , Wu Xin Jun
Published: October 2011

Prestressing strands are widely used in civil structures. The health monitoring of the strands is an important factor in evaluating the structural safety. This paper aims to improve the detection sensitivity of the guided wave technique in strands by wavelet processing. Groove defects with different depths are cut in the wire and detected by magnetostrictive sensors. The wavelet threshold method is employed to denoise the signals. In this study, the suitable thresholds are related to the median value of the coefficients. Results show that defects above 3.6% cross section loss can be found after this processing. Moreover, the amplitudes of the defect signals are related to the defect depths, which can be used to size the defects.
Design and Implementation of Short Messages Analysis System Based on Multidimensional Data Modeling
Authors: Lin Jing
Published: October 2011

Multidimensional data modeling is the foundation of OLAP. This paper presents methods of multidimensional data modeling and applies it to the SMS(short messages) communication service. In order to analyze SMS data, a OLAP model must be designed. After the data from SMS communication are divided into fact data and dimension data in accordance with needs for SMS data analysis, the fact table and dimension tables are created. The multidimensional SMS data analysis model is built on the tables and then implemented by SQL server.
A Parallel Method for Segmenting Intravascular Ultrasound Image Sequence
Authors: Sun Zheng , Liu Cun
Published: October 2011

Intravascular Ultrasound (IVUS) is one of interventional imaging modalities widely used in clinical diagnosis of vascular diseases, especially coronary artery diseases. Segmentation of IVUS images to extract vessel wall boundaries is of importance for quantitative analysis and 3D vessel reconstruction. A 3D parallel method for segmenting IVUS image sequence is proposed in this paper. Firstly, original images are preprocessed to reduce possible noises and eliminate ring-down artifacts. Then, several longitudinal cuts are obtained and intima-lumen and media-adventitia boundaries are detected. Once these boundaries are mapped onto each cross-sectional slice, initial plan of vessel wall boundaries in each frame is obtained. Finally, these initial contours evolve continuously until stop at target contours. Consequently, segmentation of each IVUS tomographic frame is implemented simultaneously and the efficiency is greatly raised compared with 2D sequential approaches.
The Design of the Weak Signal Conditioning Circuit
Authors: Wang Yong , Li Ji Fen , Zhang Ying
Published: October 2011

This paper describes the design of weak signal conditioning circuit. The amplitude of weak signal is very small and can easily be submerged by the noise, so when we choose the component for the circuit, in order to diminish the noise of the conditioning circuit, we choose a kind of low-noise operational amplifier for conditioning the signal. This circuit is applicable to the slow-varying direct current signal, even when the amplitude of the signal is dozens of microvolt, it still can work as normal.
Optimization of Suspension Roll Center Height for Vehicle Handling Stability
Authors: Zhang Liang , Wang Qi Dong , Zhu Li Hong , Luo Kai Jie
Published: October 2011

Suspension roll characteristics are investigated using multi-body dynamic simulation software to analyze the handling stability of a coach air suspension system. Sensitivity analysis is applied to reveal the relationship between the guide mechanism geometry and roll center height of the suspension. The locations of V-pole mounts are adjusted to obtain a lower roll center position. The results of the steering wheel angle step input and steady-state circular tests are compared. To verify the effectiveness of vehicle model. Results indicate considerable improvement in handling stability, made possible by the low roll center height of the rear suspension.
Numerical Simulation Key Technical Research of Hot Bend-Forming of Auto Windshield
Authors: Zhang Qing Ling , Shi Yan Guo , Wen Yuan Yuan , Tang Yan Hua , Bo Jing
Published: October 2011

Three-dimensional simplified model of auto windshield, mold, hot ring and quench ring was built using UG software in this article. Hot bend-forming numerical simulation process of auto windshield was reserched based on Show-implicit sequence solving algorithm. Finite element dynamic display simulation of press and drop forming and rebound deformation work step were finished. Distortion status, stress and strain distribution in forming process could be real-time displayed. It compared measured value and simulated value in two ways (bending depth and rebound rate) in the three groups product samples randomly selected.The comparison result proved the veracity of numerical simulation result. It had certain actual production guiding significance.
Influence of Element Number on Shape Accuracy in Multi-Point Stretch Forming of Air Craft
Authors: Wang Jing Ling , Cai Zhong Yr , Li Mine Zhe , Yang Hui
Published: October 2011

Multi-point stretch forming is a flexible manufacturing technique for three-dimensional shape forming of craft skin. Its die surface is constructed by many pairs of matrices of elements whose height is controlled by computer. It uses the curved surface of elements instead of the die surface. The element numberis an important parameter because it has great influence on the part quality. This paper simulates the forming process of paraboloid part and saddle-shaped part with different number of elements and studies the influence of element number on the shape accuracy of the part .That will provides guidance for the application of multi-point stretch forming.
The Optimization Design of the Rotary Worktable for Vertical Lathe Based on Structural Bionic Method
Authors: Zou Qing , Wang Xiang Bin , Liu Xiao Guang , Shi Guan Nan
Published: October 2011

Based on the structural bionic method, the rotary worktable of vertical lathe was optimized. Through fuzzy similarity analysis, the similarity of the bionic prototype and the rotary worktable was obtained, and the rationality of the bionic prototype was verified. According to the bionic prototype, the optimization model was established. Then it was transferred into the Workbench of the ANSYS to be analysed by the finite elements method. Comparing with the prototype, the results indicate that the bionic worktable’s mass reduces 280kg, and the deformation reduced 4.7%. The first five natural frequencies of bionic worktable increased. The results show that the bionic rotary worktable is more reasonable. It offers a new solution to optimize the rotary worktable of various vertical lathes.
The Effects of Load on the Radial Bearing Properties of Pre-Loaded Cylindrical Roller Bearings
Authors: Wei Yan Gang , Sun Meng
Published: October 2011

According to the theory of contact mechanics, the radial stiffness, the maximum contact stress, and the maximum radial load of pre-loaded cylindrical roller bearings, including both solid roller and hollow roller bearings, are calculated with the finite element method. The effects of load on the radial stiffness, the maximum contact stress, and the maximum radial load of bearing are analyzed. The analysis results show that the effect of load on the radial stiffness is complex. Under the different magnitude loads, the effects of both hollowness and interference magnitude on the radial stiffness and on the maximum contact stress are not same. Thus the effects of load magnitude must be considered in the design and application of pre-loaded cylindrical roller bearings.
Coupled Bending-Torsional Vibration Analysis of Rotor System with Two Asymmetric Disks
Authors: Zhang Jun Hong , He Zhen Peng , Ma Wen Peng , Ma Liang , Zhang Gui Chang
Published: October 2011

The dynamic equations derived based on the actual rotor system with two asymmetric disks. In the analysis, the eccentric, rubbing fault characteristics and internal damping effects is considered, and all the analysis is established based on nonlinear oil film force model and coupled bending-torsional differential equations. The Rugge-Kutta method is used to solve numerical model, the torsional displacement response, torsion angle and Poincare map are obtained. The results show torsion amplitudes with initial phase difference π / 2 is larger than initial phase difference of π and 0. In order to eliminate the rigid rolling component the relative torsional angle must be considered.
A Study of Particle Size Distribution from a Low Temperature Combustion Heavy-Duty Diesel Engine
Authors: Yu Da , Pei Yi Qiang , Pan Suo Zhu , Li Tong , Han Zhi Qiang , Zhan Qiang , Wu Song Lin , Liu Er Xi
Published: October 2011

The use of a variety of means of control in the engine combustion temperature in the low load has been more widely used. Although the opacity of the filter paper on smoke (FSN) was used as a standard in many laboratories PM quality parameters measured, but cannot be measured under different conditions the engine size and number of particles in a major change, especially in smaller size The particles on the human body more dangerous trends. So a study of particle size distribution of a heavy diesel engine emission was investigated under the condition of different intake valve closing timing, different EGR, different injection timing and multiple injections.
Dynamic Analysis and Suspension Optimization for New Energy Vehicle Based FE Model
Authors: Xu Wen Tao , Zhang Ya Hui , Miao Tong Chen
Published: October 2011

In this paper, the random vibration theory is employed to research on the dynamic performance of suspension system of new energy vehicle. Based an efficient sensitivity analysis method, vehicle ride comfort and maneuverability have been investigated by suspension parameters optimization. The pseudo-excitation method has been used to analysis the dynamic responses and sensitivity, the computation performance and adaptability have been investigated by using numerical examples. Hence a convenient and accurate computation method for new energy vehicle optimization design is demonstrated and some useful conclusions are drawn.
Research on the Cross-Octant Strategy for Spatial Curve Interpolation Based on Open-Architecture CNC System
Authors: Liu You Yu , Han Jiang , Zhang Gou Zheng , Zhu Hui Ping
Published: October 2011

To achieve the concise interpolation for spatial curves, the strategy of cross-octant interpolation was researched based on open-architecture CNC system. The sub-modules of the interpolation module for complete software type CNC system or NC embedded PC type system were designed. Take cylinder spiral-line and spatial line for instance, some studies that include principles and techniques of affine transformation, automatic cross-octant, and calling basic sub-modules of interpolation were carried out. The interpolation module for open-architecture CNC system can be divided into some sub-modules to develop. Thus, the balance between the openness and the real-time of the system are achieved. Some strategies and principles in this paper can be also applied to other spatial curves.
Study on Intelligent Control of Electric Control Air Suspension
Authors: Zhang Yun , Zhou Kong Kang
Published: October 2011

The mathematical model of electric control air suspension system was built and the intelligent control strategy was put forward in this paper. Then the related simulation and the bench test of 1/4 model of electric control air suspension system were carried out, by which the influence of electric air suspension and its control system to the vehicle dynamic performance was analyzed. The test results were identical with the simulation, which demonstrated that the electric control air suspension system could improve the automobile riding comfort performance. And the research contents had laid the foundation for the future research of electric control air suspension.