bluuebunny/crossref_metadata_2025 huggingface dataset:
Design of Water and Fertilizer Measurement and Control System for Seedlings Soil Based on Wireless Sensor Networks
Authors: Song Yong Xian , Ma Juan Li , Zhang Xian Jin
Published: December 2012

Water and fertilizer are two important factors in seedlings growth and development, the reasonable management of water and fertilizer can play a greater growth potential for seedling, and blind management of water and Fertilizer not only is harmful for seedling growth, but also will lead to the water resource waste and environmental pollution. In order to precisely determine the seedlings fertilizer demand, this paper presents a method seedlings fertilizer and water measurement and control system based on wireless sensor network, the system can realize automatic deployment of information acquisition node, data self-organization transfer, namely, wireless communication, and can accurately detect information of soil water and fertilizer and identify water and Fertilizer on the best demand of seedlings growth stages for different seedlings, different regions, different period of climate and seedling growth status, so the best water and fertilizer control is achieved in seedling cultivation. This system were introduced and analyzed from the hardware structure, software structure and so on in this paper, and it has the advantages of low power consumption, low cost, good robustness, flexibility and so on. The experiment results shown that the system is practical and efficient, which can be applied in farmland, and nursery area.
Hardware Design of Test System for Missile Flight Control System
Authors: Chen Dan Qiang , Cao Guo Hua , Fan Hui Lin , Hou Man Yi , Wang Jing Hua
Published: December 2012

Before final assembly and while debugging a missile, in order to ensure the flight control system can work stably and reliably, it is necessary to develop an auto test system for a general performance test, including electrical performance, inertial measurement device and navigation accuracy. After describing the composition and working principle of the flight control system, summarizing the test requirements, this paper puts forward to a test plan based on a industrial computer, introduces the hardware design and hardware anti-jamming techniques in detail. The test system with self-test function has been applied in testing the flight control system generally and reliably.
Extended Simulation Framework for Industrial Wireless Sensor Networks Reliability Modeling
Authors: Duan Shi Hong , Wan Ya Dong , Wang Qin
Published: December 2012

Wireless sensor networks (WSNs) are gradually adopted in the industrial world due to their less cost and easy deployment. The contributions of this paper are modeling transmission reliability in typical industrial environment and implementing the model as extended simulation framework for optimizing the hopping scheme. The statics model is realized as Extended Industrial Framework (EIF) based on OMNet++ to support the description of diverse wireless link characteristics in diverse industrial utility. The simulation results show accuracy of EIF with consistent trend as actual measurement and validity to simulate the operation of industrial WSN protocols.
A Novel Monitoring Network System of Wireless Sensor Network
Authors: Yuan Ming Hui , Gong Yan Qing
Published: December 2012

A novel WSNS (wireless sensor network sniffer) is used to analyze and evaluate the Wireless Sensor Networks (WSN) effectively, which is designed to monitor IEEE 802.15.4 protocol frame of the Ethernet. Unlike the existed monitoring system, this design has higher efficiency and needs less resource. It is analyzed in this paper that the monitor network framework, time synchronization, and analysis program design. The results show that WSNS can real time display the monitored frame and dynamic changes of WSN topology.
Multisensor Data Fusion Based on Rough Set and ART2 Network
Authors: Chen Xiao Hui , Liu Hui
Published: December 2012

A difficulty of multisensor data fusion lies in the switching of the state of sensor clusters. That is, which direction should the sensor data been fused into at a given moment? In this paper, firstly, the rough set was used for access of knowledge. The typical clustering distributions of 54 sensors within one day were regarded as sample space for the decision-making table of the "data - fusion distribution". Next, based on the method of knowledge reduction using rough set, the redundant properties and samples of data in one month were removed. Then, the ART2 network was applied for clustering and analyzing, and the distribution rules of multisensor data fusion are formed. The experiment results show that the model is efficient in classification and rapid in sensor clustering distribution decide.
Phase Difference Algorithm Based on TMS320F28335 Enhanced Capture Module
Authors: Yao Yu Peng , Zou Hai Lin , Zhang Shou Xiang
Published: December 2012

The discreteness of device parameters exists in the analog signal processing using conventional phase measurement methods, and the error caused by threshold voltage of comparator is difficult to estimate and eliminate. Due to this shortcoming, a method based on TMS320F28335 eCAP module for measuring the phase difference is presented. Firstly, the AC signal is amplified and filtered to eliminate the error introduced by electromagnetic interference, and then the digital signal through the Schmitt Trigger designed by CPLD is converted to wave signal with the same frequency of the signal, by capturing the edge-triggered, enters the capture interruption subroutine to calculate the number of the sampling points of one period, finally the phase difference is calculated according to correlation method. Hardware circuit and software flow chart are given. The experimental results verify the method has higher reliability and precision than conventional methods.
Study on Alteration Information Extraction by Using Assimilation of Multi-Sensor Spectral Data
Authors: Zhao Ling Jun , Zhang Wan Feng , Zhang Li Fang , Xie Ji Bo
Published: December 2012

Some alterations of similar spectral reflectances cannot be distinguished accurately for their lower spectral resolution when the traditional methods, such as, band ratio and principal component analysis are used to extract alteration information from Landsat ETM multi-spectral data. In this paper, the band1~band7 of MODIS whose wave lengths are among 10~500nm, together with ETM’s multi-spectral bands, whose spatial resolutions are 30m, are chosen in the execution of data assimilation. After the third order wavelet transformation, the low-frequency component of ETM data are replaced by the MODIS data subsequently, then the inverse wavelet transform is in progress. The result of data assimilation consists of not only ETM’s spatial information but also MODIS’ spectral information. At last, four bands of assimilation results are selected to process PCA transform, as a result, two types of alteration in the study area are extracted accurately according to their components.
A Design and Implementation for Optical Fibre Vibration Sensor
Authors: Sun Ke Xue , Zheng Hao , Tang Ji Bo , Cheng Xie Feng
Published: December 2012

The progress of electronic sensor technology has greatly enhanced the performance of vibration tests, and improved the accuracy and velocity of the measurement. This paper studies and designs a new non-contact optical vibration sensor based on the intensity sensor,and implementation the Optical fibre vibration sensor based on FPGA. The totally available measurement range arrived over 300um. This fiber optic vibration sensor has the advantage of good reliability, low cost, high accuracy measurements.
Windage Yaw Angle Detection of Suspension Insulator Strings Based on Edge Feature Matching
Authors: Lu Hai Jun , Lv Yu Xiang , Ma Wei Qing , Zhao Xiao Long , Zheng Xue Lian
Published: December 2012

By in-depth analysis and summary of tower suspension insulator strings images collected, a algorithm of edge feature matching of suspension insulator strings was proposed to detect the windage yaw angle in real-time. By filter, image grayscale, interframe difference and edge feature matching which based on invariance Generalized Hough Transform (IGHT) and local feature of suspension insulator strings stored in a database, the coordinates of the ends of suspension insulator strings were determined, and then the size of windage yaw angle of suspension insulator strings was calculated. The algorithm proposed can provide translation, scaling and rotation invariance, and be better matching accuracy and robustness.
Ion Mobility Spectrometry for Monitoring Chemical Warfare Agents
Authors: Zheng Jian , Shu Tian Min , Jin Jie
Published: December 2012

The technique of ion mobility spectrometry (IMS) offers a practical and fast detecting method in ambient conditions to estimate whether there may presence contrabands or even chemical warfare agents (CWAs). In this work we have investigated a self-made radioactive 63Ni (β emission) ionization source for ion mobility spectrometry employed with an atmospheric pressure to detect real CWAs, such as GB, GD, HD, VX from aerosol samples. Furthermore, we have experimentally studied the influence of drift tube temperature not only in ion cluster formation in the positive mode, but also the detection limitation of CWAs.
A study of a Silicon Carbide Capacitive Pressure Sensor Applied in Harsh Environment
Authors: Lv Hao Jie , Yu Hui Yong , Hou Jiang Hua , Geng Tao
Published: December 2012

In the paper, a Double-notches Touch Mode Capacitive Pressure Sensor (DTMCPS) is presented. The sensor employs a special SiC-AlN-SiC sandwich structure to achieve high-accuracy pressure measurement in high-temperature environment. The simulation analysis to the relation of capacitance and external pressure of the sensor shows that the sensor has higher sensitivity and longer linear range than traditional one. At the same time, the technical process of the sensor has been designed in the paper. The research shows that DTMCPS packaged in a high-temperature ceramic package can withstand higher temperature. Consequently, the sensor can be applied in high-temperature and harsh environment.
Based on Multi-Sensor Data Fusion Operating Machinery Velocity Monitoring System
Authors: Xu Xiu Ying , Huang Cao Jun
Published: December 2012

Against the shortcomings such as high price and low precision , big error leading with land wheel exist shift phenomenon in traditional tachometry, raised that the idea of using multisensor data fusion handles operating machinery speed in the field, introduced a fusion progress system structure and applied the kalman filter data fusion algorithm.This system which is based on ATS665 and GPS and mcu MSP430F1121 can work in operating machinery speed measurement and in car navigation and positioning system .The above_mentioned determines the high reliability,high cost perfomance and using easily.
Expert System for Designing Shaft-Bearing-Gear Transmission Assemblies
Authors: Butila Eugen Valentin
Published: December 2012

An Intelligent Integrated CAD system applied in mechanical engineering design for selection, calculation and design embodiment of shaft-bearing-gear is presented in the paper. The CAD activities in correlation with the expert system are defined according to a given expertise domain, design of mechanical systems, which is supposed to take into account and operate with two information type: knowledge and data. Final results and concrete example are performed using CAD/CAE/CAM software, CATIA environment. Knowledge and databases processing for application presented in this paper use specific programming environment expert systems, Prolog – Flex. For user interface Visual Basic programming language is used, and Excel for data and knowledge base, which integrated in CATIA environment. Data transmission between the two performance programs CATIA and Prolog is made through the Excel files
Model Driven Key Performance Indicators Concepts for Manufacturing Execution Systems
Authors: Schulz Thomas , Chelaru Andrei
Published: December 2012

The intention of this paper is to give some methodical approach in Key Performance Indicators for Manufacturing. Within this it covers the defining of Key Performance Indicators (KPI) and Manufacturing Execution Systems (MES). The purpose is to analyze the influences of equipment, personnel and inventory to the production process and how to apply them in making decisions. This paper gives an overview about definition of Manufacturing Execution Systems (MES) and the area of standardization of object models. The KPI for the manufacturing operations management include the areas personnel, equipment, inventory and production process. It contains also a collection of key performance indicators (KPI) to be used in the area of production control and monitoring to assess and define the targets of production processes.
Drive of Extreme Transport Technique
Authors: Ivanov Konstantin S.
Published: December 2012

The drive of the transport machine in extreme conditions should provide high reliability and durability. For this purpose the tooth gearing should have constant gearing of cogwheels. In a number of patents transmission in the form of the hydraulic converter and not switched tooth gearing is presented. However the hydraulic converter considerably complicates transfer and reduces its reliability. Transmission of extreme transport technique should have a simple design and control and to meet extreme requirements. It is expedient to use not switched adaptive tooth gearing based on a phenomenon of mechanical power adaptation. The present work is devoted working out and a theoretical substantiation of effective adaptive transmission for the transport technique working in extreme conditions.
Web-Based Tools for House Automation
Authors: Mircea Risteiu , Ioan Ileana , Gheorghe Marc
Published: December 2012

The present paper is focused on integration TCP-IP devices into smart house projects. The designed devices will send data to web application. The proposed implementation starts from server sent events for real time measurements and from X10 protocol- based devices for energy metering. In the paper we analyze hardware and software designing principles and architectures around a microcontroller application. Some real time and offline results are shown and analyzed. All the applications are successful tested in different projects, then integrated in present application.
Flutter Analysis of X-HALE UAV-A Test Bed for Aeroelastic Results Validation
Authors: Ahmad Kamran , Rahman Hammad
Published: December 2012

Aeroelasticity is one of the important fields in design of an aircraft or a flying vehicle. It deals with the interaction of aerodynamic, inertial and structural forces. The interaction between these different forces leads to certain aeroelastic phenomena such as divergence, flutter and limit cycle oscillation. Linear aeroelastic analyses of high aspect ratio wings act as basis for nonlinear analysis. Because of large wing deformation nonlinear analyses has to be performed for correct modeling. X-HALE UAV is a test bed exhibiting large structural deformation. Equipped with strain gauges and other measuring sensors, it will provide experimental data which can then be used for nonlinear aeroelastic analyses for other such kind of structures. This papers deals with the linear aeroelastic analysis of this type of aircraft.
The Faster Detection of the Step Initiation and the Prediction of the First Step’s Heel Strike Time with the Vertical GRF
Authors: Cha Do Wan , Oh Keon Young , Kim Kab Il , Park Suk Yung , Kim Kyung Soo , Kim Soo Hyun
Published: December 2012

A new approach for the detection of the step initiation in the lower extremity exoskeleton is presented. As the detection of the step initiation is the important factor for the lower extremity exoskeleton to shadow the operator’s movement as soon as possible, many studies have been done to detect it faster by using heel-off time or toe-off time. We detect the step initiation faster than other approaches with the vertical ground reaction forces. Also, we predict the first step’s heel strike time with the regression equations based on the vertical ground reaction forces as soon as we detect the step initiation. It could enable the lower extremity exoskeleton to shadow the operator’s movement much faster.
Performance Analysis of Medium Accuracy FOG-Based IMU Integrated with Optical Odometer for Land Vehicle Navigation
Authors: Ilyas Muhammad , Zhang Ren , Qian Qiu Shi , Yang Yun Chun
Published: December 2012

The aim of this work is to research the feasibility of using optical odometer as the aided sensor for accuracy improvement of medium accuracy (FOG)-based IMU for land vehicle navigation. Usually GNSS is integrated with low cost SINS (strapdown inertial navigation systems) for land vehicle navigation but GNSS is not always reliable in land vehicle applications. The focus is on analysis of position and velocity accuracy of SINS/Odometer integration using close loop kalman filter. Integrated navigation algorithm for vehicle states estimation and correction have been designed and implemented. The measurement error model for odometer in navigation frame is developed for Kalman filter implementation. As the prior knowledge of measurement noise which represents the stochastic properties of odometer is not exactly known, so an adaptive Kalman filter (AKF) is also proposed for online estimation of the measurement noise matrix in order to improve the accuracy. For the performance analysis of the designed system, field test is carried out and results show that the accuracy of the medium accuracy fiber optics gyro (FOG)-based SINS is improved and the systems is capable for land vehicle navigation application
Contribution to Analyze and Modeling of the Hand
Authors: Ionescu Mircea , Roșca Ileana Constanţa
Published: December 2012

The importance of joint integrity is a priority of the hand and wrist joints mobility is crucial for any individual. Motion control is achieved by the somatic nervous system composed of those formations which are designed to integrate body in the external environment, to achieve body relationship with this environment. Dynamic biomechanical models serve for quantitative analysis required in planning surgery on tendons [6] or to assess the transfer of nervous signals controlling the effectors [5]. Some others are dedicated to model various operations for design and implementation of the prosthetic components [13]. Recent models have approximately the same configuration: changing dimensional structure is not taken into account, but only the resulting physiological movement and rotation are analyzed for a single predominantly degree of freedom around a defined axis. Many scientists have tried over time to reproduce the hand kinematics, but not so many are those who have tried to design a guiding hand mechanism to reproduce its natural movements. The aim of this paper is to achieve the cinematic scheme of such a mechanism, able to lead fingers on path as possible as close to their natural movements.
Stress-Strain Analysis of Hip Joint after Application of Total Hip Arthroplasty with Consideration of Wear
Authors: Ebringerová Veronika , Marcián Petr , Valášek Jiří , Florian Zdeněk
Published: December 2012

The presented work deals with the creation of computational model of total hip arthroplasty and the subsequent performance of stress-strain analysis. The models of geometry of the pelvis and the femur were created on base of CT data. In To this model were fitted both of components, i.e. femoral stem and acetabular liner. On this system was subsequently modeled the real load conditions. Just real loading of the endoprosthesis leads to wear and it has great influence on the deterioration of bone tissue. These properties were simulated under the acetabular component. The behavior of the whole system is assessed on base of stress-strain analysis. From comparison the obtained results with clinical study it is evident that the places, that are dangerous in terms of establishment wear particles, are identical. This whole issue is very topical today.
Healthier by Safe Persuasion
Authors: Berteanu Mihai , Badea Ruxandra , Ciobanu Ileana , Dumitru Luminita Violeta , Iliescu Alina Nela , Dinu Horatiu
Published: December 2012

We have three generations of persuasive technology devices used in health care, up to now. The IS-ACTIVE system –Inertial Sensing System for advanced Chronic Condition Monitoring and Risk Prevention is a third generation system, using IT, inertial sensors, sensors for physiological parameters and a feedback device in order to improve the physical activity and subsequently, the health state and the quality of life for people affected by chronic obstructive pulmonary disease and other respiratory and cardiovascular disabling medical conditions.
Electromagnetic Compatibility Requirement of NC System-Research on Grounding Technology
Authors: Zheng Ling Li , Gao Tian You
Published: December 2012

NC systems are generally used in electromagnetic environment, so NC system should be designed for electromagnetic anti-disturbance in order to ensure system work normally. The main task of the electromagnetic compatibility is conducted around the three elements causing disturbance, which are the electromagnetic disturbance, propagate pathway and sensitive equipment. This article discusses grounding technology and electromagnetic compatibility requirement of NC system.
Research State of Combine Threshing Unit Monitoring System and Insufficiency and Emphasis in China
Authors: Zhang Cheng Wen , Wu Chong You , Wang Su Zhen
Published: December 2012

This article summarizes the development of United States, Japan and other foreign combine threshing part monitoring system. Meanwhile it analyses the research status of China from two aspects of fault diagnostic and the relationship with feed rate. Which is specifically illustrated the present researching status of the fault alarm, fault warning, troubleshooting, and the relationship be-tween feed rate and travel speed, roller torque, the drive pulley oil pressure relations. At last it con-cludes the insufficiency in the present studies and points out the direction of the strengthened re-search that is model of real-time controlling about feed rate.
The Research of Heterogeneous CNC Machine Tool DNC Integration System Based on OPC Technology
Authors: Ao Mao Yao , Zhao Yan
Published: December 2012

Because different manufacturers of CNC machine tool use the different NC system at present, it results the actuality that the CNC machine tool is hard to integrate and manage. This paper proposed a scheme of DNC integrated system of heterogeneous CNC Machine Tool based on OPC technology, after analyzing OPC interface and industrial Ethernet technology. Establish workshop-level experimental platform of DNC system based on Ethernet network. On this platform, establish the communication with OPC Server by using VC, realize monitoring and management to the bottom heterogeneous CNC machine tool. The example proved that the scheme was practical and effective.
A Research on Magnetic Properties of Ferromagnetic Liquid γ–Fe2O3
Authors: Wang An Rong , Huang Hai Yan , Shu Chun Jun
Published: December 2012

This paper explains how to make ferrimagnetic ferrofluid r-Fe2O3with chemical precipitation. First, ferrimagnetic nanoparticle r-Fe2O3is produced with chemical coprecipitation. Then, the ferrofluid r-Fe2O3is synthesized by Massart method. Without magnetic field, the interaction energy of two r-Fe2O3particles is about 1.92×10-19J, which is more than heat energy and is easy to form a reunion. There exist ring-like structure in ferrofluidr-Fe2O3, which has no contribution to the saturation magnetization. The saturation magnetization is less than the theoretical value. The bigger the volume fraction, the more self-assembly ring structure, the less possible it is to crack in the process of dilution and magnetization.
The Study on Submersibles Magnetic Separation System
Authors: Zhao Yang , Cheng De Fu
Published: December 2012

In the traditional magnetic separation in dry conditions of magnetic filter jams caused by the efficiency of the machining decline. In order to solve this problem, filter arrangement in magnetic separation. Jam magnetic filter is success in reducing the through the use of prismatic-shaped filter. In addition, the separation effect of prismatic-shaped filters is added as high as, mesh filters used for high system routine.
Explorative Study on the Application of Digital Interactive Technology in the Expression of Sculpture Shadow
Authors: Wu Yi Heng
Published: December 2012

In the modern times, the art of sculpture under the promotion of the development of the interactive multimedia technology using digital technology as a platform has been changed greatly in art language and expressive forms, Under the common infiltration and fusion of these modern technologies, new things has been fused and absorbed by the art of sculpture. In this paper, using the relationship between sculpture materiality and digital virtualization as study topic, the author makes an explorative study on a new expressive form applying the information features of the digi-tal interactive technology to deliver the inner meanings of the sculpture art.
Color Filter Based on Image ROI Extraction
Authors: Wang Su Huan , Yin Jian
Published: December 2012

With the rapid development of Internet, more and more enterprises establish business sites to achieve the purpose of online transactions. Taking taobao.com for example, hundreds of millions of goods trade on the trading platform. In front of the huge commodity image database, extraction of image features is very convenient for people to find out images of user requirement. This paper focus mainly on the color feature of images. Firstly, we segment ROI of images using grabCut algorithm; secondly, we extract primary color of images by using dominant color descriptor of MPEG 7; Thirdly, we adopt RGB color quantization to quantize the primary color. Finally achieve the purpose of image color navigation. I have done experiment to compare with some other methods, and find that the algorithms I adopted make a better performance.
Study on the Influence of Pitch Diameter Ratio on Contact Mechanics Parameters between the ACSR Strand
Authors: Wu Hong Liang , Ding Hui , Zhu Cheng Li , Dou Hong
Published: December 2012

Fretting damage generates under the breeze vibration condition. Fretting wear under various pitch diameter ratio at the ACSR strand interface has been studied by FEM method with the LGJ-25/4 ACSR taken as an example. The contact mechanics parameter distribution laws at the strand interface have been obtained. It shows that the peak of von Mises stress, contact pressure, contact state and shear stress at the contact spot decrease as the pitch diameter ratio increases. And the width of yield area also decreases as the pitch diameter ratio increases.
Electrical Resistivity and Application of Cu3N Thin Films
Authors: Ren Y.Q. , Liu M. , Yuan X.M. , Liu T. , Zhang N.
Published: December 2012

The paper mainly reviewed the electrical resistivity and application of Cu3N thin films. The electrical resistivity increases from 2×10-5Ω•cm to 2×102Ω•cm. The application of Cu3N thin films as write-once optical recording materials and anode material for Li-ion rechargeable batteries was also presented.
Study of Siloxane Injection Technology on XLPE Cables for Water Tree Aging
Authors: Liu Fan , Liu Ping , Yang Lin , Zhou Kai , Zhao Wei
Published: December 2012

This paper introduces one siloxane rejuvenation fluid used to rejuvenate aged XLPE cables and also studies the effects and the mechanism of the rejuvenation. Accelerated aging experiment was performed to obtain water tree aged samples. Inject the rejuvenation siloxane fluid into the aged cable samples with a pressure injection system. By comparing the dielectric loss factor and the breakdown voltage level of the samples before and after rejuvenation, inferred that the insulation level of the cable samples after rejuvenation is close to or higher than that of new cables. Additionally, through microscope, organic compounds created by chemical reaction were observed to fill the micro voids and eliminate the moisture in the XLPE layer of the samples. Finally, the electric field was simulated by Finite Element Method (FEM). Based on the results, it's further confirmed that the siloxane rejuvenation fluid can significantly enhance the aged cable insulation.
Motion Simulation and Optimization Study of Manipulator with 4-Dof Based on Hydraulic Driving
Authors: Tang Xin
Published: December 2012

This article conducts a detailed research on design of specific robot with 4-Dof based on hydraulic driving, using the advanced CATIA to achieve the motion simulation and applying ANSYS to optimize structure of main parts by finite elements analysis. D-H coordinate system and the homogeneous coordinate transformation matrix are used to describe the posture and position of robot, which give the kinematics equations of the robot .With the result of simulation and design by CATIA, interference between each part of the robot is examined and eliminated in advance. ANSYS analysis gives the result of stress and strain, which help optimize the structure design. With careful design and targeted optimization, the result shows that trajectory and stability are in accordance with the work scheduled to meet the design requirements and that designing with CATIA and ANSYS can improve quality and efficiency greatly.
Instrument Landing System Error Analysis and Simulation of Calibration Flight
Authors: Zhang You Hui
Published: December 2012

To ensure the fidelity of the ILS signal, the errors must be strictly controlled. The benchmark calibration flight precision control had very few attentions as the criterion. Therefore, through the computer to build a relatively complete set of airport simulation environment, we can design a control system and intuitive way to monitor the signal used to get rid of a variety of factors lead to errors. This showed the calibration results were unstable. The insightful significance is that this provides a guideline for the visualization and conformity of complex electromagnetic environment.
Simulation Research on Bonded Microchannel Deformation of Polymer Microfluidic Chip
Authors: Huang Lei , Wang Zhang , Chu Chun Peng , Jiang Bing Yan
Published: December 2012

A new bonding method of microfluidic chips, bonding in-mold, was presented. Finite element software simulation was used to study the deformation of microchannels in poly methyl methacrylate (PMMA) bonded chips. Varied temperature and compression thickness have been taken into account. Results showed that bonded microchannel cannot maintain the cross-sectional shape and dimensional accuracy. The area of cross-section was smaller. Its height changes since the substrate’s raised up and the cover plate’s bulged down. But the width dimension of microchannel was essentially unchanged. The deformation caused by thermal expansion is small. Experimental data show that compressed thickness has a greater impact than temperature.
Visual Simulation of Mobile Channel Model
Authors: Yang Yi Huai
Published: December 2012

Simulink is the integrated environment of system modelling and simulation, which is being widespread used. This paper describes the MATLAB visual simulation of the propagation path loss model for telecommunication systems. We simulated the whole process of COST231-Walfisch-Ikegami model with high accuracy, built a visual simulation frame and the path loss curves are given. This method can be used in studying other propagation path loss models in propagation environments.
Study of Nonspherical Particle Magnetorheological Greases with Computer Simulation Technology
Authors: Wei Juan , He Guo Tian , Song Li , Yan Ma , Li Ming , Xu Ze Yu , Ran Ying Chun , Zhang De Sheng
Published: December 2012

Based on computer simulation technology, we put forward the shear stress model of nonspherical magnetic particle MRG, and take the hexagon form magnetic particle MRG as an example; this paper deduces hexagon magnetic particle MRG shear stress formula. The model simulate and calculate the relationship between shear yield stress and magnetic field intensity respectively when radius and side length is equal and when the volume is equal also shear yield stress in the zero field condition. The simulation results show that in the same volume condition the shear yield stress of nonspherical magnetic particle MRG is bigger than that of spherical magnetic particle MRG; the shear yield stress of nonspherical magnetic particle MRG cut down with contacting side length’s reducing but also greater than that of spherical magnetic particle MRG and this relationship is also the same in the zero field condition, so spherical magnetic particle MRG is not the best choice. Therefore, this research has an extremely vital significance for the development and application of high-performance MRG.
Vibration Tests of the Processing Shaft Cascading Structure in High Speed and High Precision PCB Drilling Machine
Authors: Gong Feng , Tan Yan Ping , Li Ji Bin
Published: December 2012

It is necessary to study the dynamic characteristics of the structure of processing shaft cascade in high speed and high precision PCB drilling machine because of its great impact on the drilling precision. As a basic part, the dynamic characteristics of the structure of cascade depend on the dynamic characteristics of the Z-axis floor. Based on it, firstly, the free mode test is conducted on the Z-axis floor, the same as the modes that it is just set up on the guide rail, the cascade is added and the motor spindle has been added on the Z-axis floor. From the four situations, the modal pa-rameters are gained in the tests. Then the ODS test is carried out and the vibration is analyzed in the real situation. The vibration tests of the cascade comprehensively acquire dynamic characteristics from the Z-axis floor before being assembled to the Z-axis floor which is entirely cascaded on the Z axis. Acknowledge of the impact that the vibrations bring to the drilling precision of the drilling machine provides the direction of improving the structure.
Effect of Design Parameters on the Reduction of Top Piston Ring Friction
Authors: Wu Bin , Zhang Zhi Nan , Wang Ping
Published: December 2012

In order to reduce ring-liner interface friction power loss, this paper focuses on the structure parameters of the top ring, and investigates how the value of those parameters will influence top ring-liner friction power loss and the minimum thickness of oil film at top ring-liner interface. A mixed lubrication model is developed to simulate the effect of varying design parameters on ring-liner friction. Case study shows that ring-liner friction power loss will be reduced with decreased axial ring height and barrel height. This study provides a theoretical basis for design the top ring with reduced friction power loss at ring-liner interface.
US-FE-LSPIM TRI3 Element for Free Vibration Analysis
Authors: Chen Hui Hui , Jia Cheng
Published: December 2012

For the purpose of construction an effective element model, the US- FE-LSPIM TRI3 element formulation, which is based on the concept of unsymmetric finite element formulation, is established. Classical linear triangle shape functions and FE-LSPIM TRI3 element shape functions are used as test and trial functions respectively. Classical linear triangle shape functions fulfill the requirements of continuity in displacement field for test functions. The FE-LSPIM TRI3 element shape functions synthesize the individual strengths of meshfree and finite element methods so they are more proper for trial functions. The element is applied in free vibration analysis of two dimension solids. Typical benchmark problems are solved. The results show that this element is more accurate and capable of good performances under both regular and irregular meshes.
Interdependence between High-Speed Mill Chatter and Unsteady Lubrication of Metal Rolling Process
Authors: Wang Qiao Yi , Zhu Yao , Zhao Yong
Published: December 2012

A metal-rolling process with chatter is chosen as the case for analysis. An isothermal, full film unsteady lubrication model is developed. The influences of time dependent variables such as back tension stress, variation on lubrication are investigated. By utilizing this model, roll forces and torque variation with respect to time can be successfully predicted. Chatter vibration in cold rolling due to unsteady lubrication phenomena is discussed. The current unsteady lubrication theory indicates that, when the nondimensional frequency of back tension stress variation is in a specific range, the roll force and torque variations can be significantly “amplified”.
Research of Global Boundary Optimization for Automobile Engine
Authors: Kong Li Fang , Liao Da Qing , Liu Xin Bin
Published: December 2012

An adaptive genetic algorithm was proposed to optimization bound in order to speed up the convergence of Gaussian mean shift. In practical question, as it's difficult to give a critical value definitely. According to the engine nonlinear of the corresponding oil and performance parameters, in gradient genetic algorithm, BP algorithm of local search is introduced. The adaptive value of chromosomes group gets quickly improved with the search in one coding field getting avoided due to the utilization of knowledge of chromosomes in problem-domain. The crossover and mutation operations are added so that chromosomes will not fall into the local minimum point in neighborhood. The experimental results prove that the convergence speed of the proposed method is non-linear and the use of gradient genetic algorithm is a fast algorithm that can support the global optimization of chromosomes in a group of process of iteration.
High Resolution Retinal Imaging Based on Ocular Aberration Measurement and Compensation
Authors: Liang Chun , Shen Jian Xin , Niu Sai Sai
Published: December 2012

Ocular retinal imaging is a major diagnostic modality for retinal disease, and can play a critical role for diagnosing systemic diseases such as diabetes and eye-specific diseases such as macular degeneration and diabetic retinopathy, the leading causes of blindness. In order to get high-resolution retinal imaging and develop the low-cost and compact retinal imaging system, we employ micro adaptive optics, which is consisted of wavefront sensor, wavefront corrector and control system. In this paper, the theory, design and testing of the ocular retinal microscopy is detailed, with an emphasis on the eye wavefront aberration describing, aberration detecting method with Hartmann-Shack wavefront sensing and close-loop aberration compensating by micromachined membrane deformable mirrors(MMDM).The ocular retinal microscopy experimental setup is built, the retinal cell imaging had been snapped. It is showed in this work that the ocular retinal microscopy based on adaptive optics system can enable diffraction-limited imaging of micro-scale features of the retina, through real-time compensation of aberrations introduced by the eye.
Research of Intelligent Localization of Target for Manipulator Based on the Monocular Vision
Authors: Zhang Zheng , Liu Xiao Wei , Yang Guang You
Published: December 2012

A kind of calculation model of 3D space transformation is introduced, which is applicable to the monocular vision of robot manipulator, and the three-dimensional space plane mapping problem of image plane to the actual horizontal plane of monocular vision has been solved. It transforms the imaging coordinate system of target in monocular vision into the world coordinate system of the manipulator, so as to calculate the relative position of targets and the manipulator. The algorithm has better accuracy and reliability, which is proved by contrasting and testing the calculation result of object coordinate system transformed to the actual position coordinates to the sampling points in embedded platform.
Detection for Weak Navigation Line for Wheat Planter Based on Machine Vision
Authors: Liu Yang , Chen Bing Qi
Published: December 2012

In order to realize automatic operation for a wheat planter in a field, an algorithm was developed in the research to detect navigation line under sowing operating environment with weak navigation information based on machine vision. Wavelet transform, linear analysis and front and rear frame interrelated were used to get candidate points at regional boundary in the image. Then linear fitting of the candidate points was carried out using the Passing a Known Point Hough Transform. Sowing videos captured under different natural conditions, in different regions were used to test the performance of the algorithm. Results show that the algorithm is able to detect ridge line, sowing line and field end accurately, steadily and quickly, the average processing time for each frame is about 30ms.
Online Browsing Service of Scenic Based on 3G Wireless Video Network System
Authors: Hou Fu Qiang , Zeng Wei Zhou , Kan Ai Ke
Published: December 2012

Having designed and achieved a sort of wireless video network system based on 3G TDCDMA, this system is applied to provide users witht function which is online browsing service of real-time natural landscape on the Mt. Everest. By means of erecting the video cameras on the Mt. Everest and 3G network service based on H.264 video coding technique to preview post-coding data via WEB server on the internet. Through the use of 3G network technology and H.264 video coding technology, users are able to get access to the video with higher quality, implementing the function of browsing scenery in scenic.
Subspace-Based Indirect Adaptive State-Space Model Predictive Control
Authors: Luo Xiao Suo
Published: December 2012

In order to deal with nonlinear, time-varying and disturbance-involved characteristics in the practical industrial processes, an indirect adaptive state-space MPC (model predictive control) method based on subspace identification is proposed. The state-space model, obtained through the POMOESP (Past Output MOESP, MOESP is one form of the subspace identification methods) algorithm, is regarded as the system model. Then, this model is used to design the model predictive controller that involves the solution of a quadratic programming problem to constraints. This controller is applied to the process control simulation on a 2-CSTR. Through comparisons of performance with a linear state-space MPC scheme, the superiority of the proposed control method is illustrated.
Simulation Based on OPNET and within IPv6 Real Source Address Authentication
Authors: Zhu Zhi Yu
Published: December 2012

According to the RFC5210 standard SAVA architecture, This paper designed a certification program within the source address based on MAC address of IPv6.Use the OPNET Simulation the network performance (server delay and load) under normal state and dos attack state .The results show that the program could be effective in preventing a single degree of autonomy within the source address spoofing, and improve network stability.
Research on MongoDB Design and Query Optimization in Vehicle Management Information System
Authors: Zhao Yan
Published: December 2012

NoSQL database is the broad definition of non-relational database. MongoDB is one of the most popular NoSQL database nowadays, and it is a schema-free and document oriented database, which has great query performance with huge amount of data and great scalability. More and more companies have adopted MongoDB, as increasingly large scale data is being stored in MongoDB, design philosophy and query optimization issues become growing concerns. This paper attempts to give the data storage structures of MongoDB on vehicle management information system. Based on this system, this paper gives two design philosophy and five different query optimization methods for MongoDB and gives the key code and diagrams of MongoDB optimization methods.
Numerical Simulation and Improved Design of Inner Flow Field on Single Function Shower
Authors: Huang Jing , Zhang Jun , He Hong Zhou , Lu Ming Fang , Liu Xiao
Published: December 2012

To reveal the variation of the inner flow field on a single function shower, numerical simulation was conducted for single-phase flow using water as the working medium. The standard k-ε turbulence model is employed to simulate inner flow characteristics. To improve the uniformity of outlet flow, according to the simulation results of the old shower, the mold structural have been modified. The results show that, the outlet shape and different size will affect the internal flow field. According to the old shower analysis of the flow, speed of the outlet fluctuations are more obvious, while the improved shower flow rate of the outlet distribution is more uniform and old shower exists of vortex in the two shares of water region, but improved shower vortex is smaller and the distribution of flow is also better than the former.
A Study on Performance and Emissions of a DI Diesel Engine Using Oxidation of Diesel Additive Blends
Authors: Li Qiang , Liu Yan Fang , Xu Xiang Yang
Published: December 2012

The FC2000 automatic engine test system for control and measuring the engine speed, torque, power, fuel consumption, temperature, pressure, and flow rate of different kinds of parameters. Different kinds of sensor output signal, focused on CAN intelligent module regulate into standard digital signal, through the bus network for transmission, facilitate the centralized management. The engine was burning, E15 E20, the mixed fuel, as a mixing of acetate ethylene glycol proportion of the increase, the economy improved. In 2200 RPM, 2800 RPM, 3600 RPM load characteristics, with a acetate ethylene glycol mixing ratio increases, CO emissions in the small and medium-sized load conditions gradually increase in big load conditions gradually improve.
Aerodynamic Design Investigation on Inlet-Exhaust System Using Super-Ellipse Method
Authors: Li Yue Feng , Yang Qing Zhen , Deng Xue Jiao
Published: December 2012

Generally, the shape index n is selected in a form when design the inlet-exhaust system using traditional super-ellipse method. Unfortunately, this selection process is time-consuming and not precise enough, so the cross-section designed by super-ellipse method may get distortions easily, which influences the inner flow and the total pressure of the inlet-exhaust system greatly. Associating the shape index n with the variation pattern of the inlet-exhaust cross-section, an improved super-ellipse method is developed to design the inlet-exhaust system. This method ensures the precision and uniqueness of shape index n for any cross-section in an adaptive way. The numerical simulation results show that the S-shape inlet designed using this method has high total pressure recovery coefficient and lower distortion coefficient, the S-shaped nozzle has high total pressure recovery coefficient and thrust coefficient.
Effect of Unstable Motion on the Braking Performance of a Tugboat
Authors: Rong Lei , Yang Lin Jia , Cui Jian Hui , Wang Xin Hui
Published: December 2012

Unstable motion is characteristics of tugboat for retarding a large vessel. It will make the capabilities of tugboat’s braking force vary. In this paper, we used an ASD-tugboat model to measure the yaw and sway amplitudes and the braking force when the tugboat model is towing on a line. In addition, we still had carried out the tests of hydrodynamic forces acting on the tugboat model. Finally, we confirmed that the yaw and sway motion was existed and the tugboat’s braking performance was affected by the unstable motion.