bluuebunny/crossref_metadata_2025 huggingface dataset:
Prediction of Wrinkling Initiation and Growth in Aluminum 5456-H116, Alloy Sheets by Finite Element Analysis of Yoshida Test
Authors: Sattar Amer , Manarvi Irfan Anjum , Masud Manzar
Published: September 2012

Wrinkling is one of the most undesirable effects during forming of thin sheet metal plates. It deforms the surfaces and either hampers further assembly or creates stress concentration regions which may fail during operations. Yoshida wrinkling test is considered as one good tool to analyse the wrinkling properties of sheet metals. Alluminium alloys are most commonly used in aviation industry where wrinkling initiation and its propagation is considered an even serious defect. Present research was therefore focussed on Finite Element simulations of Allumium Alloy-5456-H116 metal sheets specimens of the standard shape of Yoshida specimen. During simulations the applied load values were equal to Yield strength, yield strength +10%, and Yield strength -10%. Wrinkling initiation and propagation was observed as deformations along X,Y and Z axis on a predefined path of the specimen and stress values at this path were also evaluated. Findings have been established through an overview of deformation along each axis corresponding to stress values at that location on the path.
Finite Element Analysis (FEA) for Prediction of Wrinkling in Aluminum 6061-T6 Sheets
Authors: Manarvi Irfan , Sattar Amer , Jadoon Jawad Ahmed
Published: September 2012

Aluminum is one of the most popular metal in a wide variety of applications in manufacturing of components for airplanes, automobiles, house hold etc. A wide variety of parts are manufactured using aluminum sheet of different alloy composition. Wrinkling of sheet metal is the most undesirable phenomenon in sheet metal forming, drawing, punching and other similar manufacturing processes. Current research is focused on Finite Element Analysis of Aluminum 6061-T6 sheet to simulate onset and growth of wrinkles of various thicknesses using ANSYS. Based on the results a comparison was drawn between the wrinkling behaviors at varying load values.
Effects of Chemical Reaction and Soret Effect on Mixed Heat and Mass Transfer for Hiemenz ﬂow through Porous Media with Heat Source
Authors: Shateyi S. , Motsa S.S.
Published: September 2012

The eﬀects of chemical reaction and thermal-diﬀusion mixed convection heat and mass transfer for Hiemenz ﬂow through porous media has been studied. The plate is embedded in a uniform porous medium in order to allow for possible ﬂuid wall suction or blowing and has a power-law variation of both the wall temperature and concentration. We used similarity solution to transform the system of partial diﬀerential equations, into a boundary value problem of coupled ordinary diﬀerential equations. We then solve these ordinary diﬀerential equations by a MATLAB routine bvp4c. We conducted a parametric study of all involved parameters and the results represented graphically.
Analyses of Adhesion Strength for DLC Coating-Silicon Structure
Authors: Zhang Jun , He Bin , Wei Xin Li , Yuan Zhen Wei
Published: September 2012

The adhesion strength of Diamond-like carbon (DLC) deposited onto silicon substrates using an arc-pulse sputtering technique was studied by experiments and numerical simulations. A scratch test was used to detect the adhesion strength of the DLC coating, which was simplified by two processes of tearing and peeling for FEA. The numerical simulations were performed by ABAQUS to calculate the two processes and integrate the result. The FEM simulation results fit with the scratch test. It is concluded that the simulation method is effusive and can be adopted to calculate the adhesion strength of DLC coating on the silicon substrate structure in other cases.
Research of Resistance Capability and Equivalent Floor Live-Load of Steel Frame under Fire
Authors: Han Yu Lai , Sun Bai Tao , Wang Zhen Qing
Published: September 2012

The increasing of equivalent floor live-loads is used to describe the weakening of ultimate carrying capacity of the structure by analyzing variety of the beam’s ultimate moment and ultimate shearing force and the carrying capacity and stability of the column of steel-frame in fire, the formulas of the beam’s ultimate shearing capacity, the carrying capacity and stability of column and the equivalent floor live-loads have been derived based on these. The variety rules of the carrying capacity of beam and column of the steel-frame with different thickness of the protection layers and the equivalent floor live-load have been analyzed in the example, the results showed that different equivalent floor live-load may be used to analyze the infection of fire temperature to the carrying capacity of structure in the computations of steel-frame in fire according to different time and fire temperatures of structure members, the mechanics computations of structure would be predigested and the variety of ultimate carrying capacity of steel-frame also could be estimated.
Analysis of Turbulent Flow Development Downstream Disturbers with Perforated Plate Flow Conditioner
Authors: Laribi Boualem , Abdellah Hadj Abdellah
Published: September 2012

This article discusses the development and the establishment of turbulent flow downstream of disturbers like a valve 50% open, valve 70% open, Tee and 90° double bend in perpendicular planes. Associated with these disturbers, a perforated plate flow conditioner is installed to examine his performances to produce the fully developed pipe flow as suggested by standards ISO5167 and AGA3. The study focused mainly on the numerical analysis of the velocity contours at several axial stations downstream the disturbers. For the simulation, code CFD Fluent was used. The study of the disturbed flow is examined with three Reynolds numbers. The results show a very good prediction of the CFD code Fluent for the flow development downstream the disturbers and conditioner which makes the code very efficient for conception of a new flow conditioner not described by the standards. It was also found that the valve 50% open could be considered a reference disturber for analyzing the development of turbulent flows. As interesting results, is the effectiveness of the perforated plate to produce the flow developed pipe flow at about z/D=10 downstream the disturber. This result is very important for flow measurement accuracy as suggested by the standards. An experimental study is needed to validate these results.
Hydrolysis Process and Mechanism of Magnesium Aluminate Alkoxides
Authors: Wang Xiu Hui , Yin Jian Long , Liu Wei , Gao Hong , Yang Jin Long
Published: September 2012

Superfine, high-purity and well-distributed magnesium aluminate spinel powders were fabricated by controlling alkoxides hydrolysis process. Magnesium aluminate alkoxides were prepared by sol-gel with magnesium, aluminum and n-butyl alcohol as starting materials. Magnesium aluminate spinel powders were fabricated by double alkoxides sintering at 1200 °C for 1h. Controlling hydrolyzing process could obtain the optimum gel time and spinel powders were analyzed by OMEC LS-800 type Laser Particle Size Analyzer. Integrated gel time and particle size, the optimum hydrolyzing parameters are obtained for double metal alkoxides: the concentration of the double metal alkoxides is below 0.3 mol/L, hydrolysis temperature is 20 °C, the molar rate of alkoxides and water is 1: 10 and the mechanism of the hydrolysis is investigated. Nicolet Avatar 360 type FTIR spectrometer shows that acetylacetone and alkoxides can form a stable hexatomic ring which restrains hydrolysis reaction and controls particle size.
The Coning Designs for the Micro Forming of a Surgical Slit Knife Using FE Simulations
Authors: Ma Xin Wu , Zhao Guo Qun , Li Wen Juan
Published: September 2012

This paper deals with problems in the coining process for manufacturing surgical slit knife using two-dimensional (2D) and three-dimensional (3D) finite element (FE) simulations. The FE simulations are performed to investigate the material flow, and especially stress distribution on the coining dies. The main objective of this paper is to study the feasibility of a coining process for manufacturing a given geometry of surgical slit knife without forming defects and die failure. Very high stress distribution on the coining dies is found by 2D simulations of the coining process that exceeds the strength limit of the die material. The optimum preform and preforming die geometry are determined by FE simulations in order to reduce the die stress. 3D simulations of the preforming and coining processes are conducted with the optimal design to show that the geometry of the product can be achieved without defects by the coining process.
Microalgal Biofuels Beat the First and Second Generation Biofuels
Authors: Zhu Lian Dong , Hiltunen Erkki , Takala Josu
Published: September 2012

Recently biofuels derived from biomass have received increased concerns in an attempt to search for sustainable development. The first and second generation biofuels are unsustainable since the growth of these food or non-food crops for biofuel generation will compete for limited arable farmlands, thus increasing the risks on food availability. Microalgal biofuels, known as the third generation biofuels, have the potential for sustainable production in an economically effective manner. The advantages of microalgae as a biofuel feedstock are many, for instance, high photosynthesis efficiency, high oil content and noncompetition with food crop production on farmlands. Microalgae can be employed for the production of biodiesel, bioethanol, biogas, biohydrogen, among others. The integrated biorefinery approach has huge potential to greatly improve the economics of biofuel production from microalgae. However, the production of microalgal biofuels is still at pre-commercial stages since it is expensive to produce substantial amount of biofuels at a large scale. Despite this, microalgae are still the most promising and best feedstock available for the biofuels. Biotechnology advances including genetic and metabolic engineering, well-funded R&D researches and policy support can make microalgal biofuels have a bright future.
A Dynamic Electrical Scheme for the Optimal Reconfiguration of PV Modules under Non-Homogeneous Solar Irradiation
Authors: Candela Roberto , Sanseverino Eleonora Riva , Romano Pietro , Cardinale Marzia , Musso Domenico
Published: September 2012

This paper presents a strategy for the maximization of the output power of photovoltaic (PV) systems under non homogeneous solar irradiation by means of automatic reconfiguration of the PV arrays layout. The innovation of the proposed approach is the employment of a simple Dynamic Electrical Scheme (DES), allowing a large number of possible modules interconnection, to be installed between the PV generator and the inverter. The models of the PV generator and of the DES have been realized and simulated with Simulink (Dynamic System Simulation for MATLAB). The attained experimental results appear to be quite interesting in terms of the attainable benefit in power and thus energy terms. The limited calculation times of the reconfiguration algorithm allows the application of the DES for the real time adaptation of the configuration to the changing weather conditions or other causes of non-uniform solar irradiation. Moreover, the results confirm that, in case of non uniform solar irradiation, this approach allows to attain considerably much better results than those attainable with a static configuration.
Effect on Measurement of the Radiated Acoustic Field of Underwater Structure Based on NAH with Swinging Measuring Surface
Authors: Zhou Lin Na , Ding Shao Chun , Zhang Ruo Yu , Lou Jing Jun , Zhu Shi Jian
Published: September 2012

This paper analyzes the effects of the swinging NAH(Near field Acoustical Holography) measuring array on measurement of the sound power level of underwater structure. We use the method of sound intensity integral, the method of mean square sound pressure and the method of NAH reversal pressure to calculate the sound power level under certain collection of frequency with measuring surface in different states. We also analyze the relative error of results acquired by those methods, which can help validating the reliability and the error estimate of the results calculated with NAH.
Research of Virtual Test of the Combine Harvester Cleaning Component
Authors: Wang Xu Dong , Su Xia Kan , Yang Zi Dong
Published: September 2012

According to the purpose and requirements of a virtual test, the complex mechanism of the combine harvester was abstracted and simplified to some extent during modeling, but in order to guarantee the closeness between simulation result and the reality, attention was paid to keeping the total mass of all components close to the actual mass of the combine harvester and reducing workload during modeling. The vibration test of the cleaning operation includes horizontal vibration and vertical vibration. The test conditions are that: the combine harvester is still and has no load and only the engine runs, or the engine and the cleaning component run simultaneously. To guarantee the extractions are thrown out of the machine in the rear end of the screen, the backward slip of the extractions is greater than forward slip. The simulation result satisfactorily reflects the real situation and is same as theoretical analysis. The result indicates the virtual test and the real test are consistent.
Research on the Remote Monitoring System of Building Energy Consumption Based on GSM/GPRS
Authors: Liang Chuan Zhi , Lu Meng Meng
Published: September 2012

The paper aim the remote monitoring system of energy consumption in buildings based on GSM/GPRS by a case, and introduces the system framework, operating mode, transmission technology, equipments and installation requirements, as well as illustrating software composition and function of the data center. The system can reflect classified electricity consumption in monitored buildings correctly. It not only understand situation of energy consumption in real-time, but also offers basic data for further energy auditing and energy efficiency assessment. The conclusion can develop management of building energy consumption and increase the building energy efficiency.
Effect of Particle Size Distribution on Microstructure and Wettability of 316L Coating
Authors: Li Zheng Feng , Zheng Yan Jun , Cui Li Shan
Published: September 2012

In this paper, a superhydrophobic surface was first obtained on plasma sprayed 316L coatings. The influence of particle size distribution of feedstock powder on the microstructure of the prepared coating was investigated. The results show that a wide particle size distribution may lead to a porous coating with a micro/submicro dual scale morphology. The wettability of the porous coating can change from superhydrophilicity to superhydrophobicity through modulating the surface energy. In addition, mechanical durability tests show that the morphology of the prepared coating varies periodically with abrasion time. The successive exposing of fresh layers with similar morphology during abrasion process was proposed to explain this phenomenon.
Influence of Process Parameters on Temperature Field in Laser Remelting Coating Prepared by Plasma Spraying on Titanium Alloy Surface
Authors: Guo Hua Feng , Sun Tao , Li Zhi , Li Ju Li
Published: September 2012

In order to research the effect of process parameters on temperature field evolution in laser remelting coating prepared by plasma spraying on titanium alloy surface，the finite element model of laser multi-tracks remelting temperature field was established based on ANSYS, and remelting temperature field was analyzed. The analysis results show that: under certain scanning velocity and laser spot diameter, too small laser power can't achieve metallurgical combination between coating and substrate; the effect on temperature field of scanning velocity was smaller than laser power; the influence on molten pool center temperature and remelting width of spot diameter is bigger; preheating coating and substrate can be effectively balance remelting process temperature field, thereby reducing the thermal stress and coating cracks appear chance.Through the calculation model can master the evolution of the temperature of lasre remelting process and can provide the theory basis for process parameter selection and optimization.
Analysis and Research on Driver’s Comfort in the Process of Getting on and off the Car
Authors: Li Li Jia , Zhao Li Li , Dai Yu Yang
Published: September 2012

Due to the Low Body and Small Door, Driver’s Comfort in the Process of Getting on and Off the Car Must Be Taken into Account when Designing the Car Body. the Research on Driver’s Comfort in the Process of Getting on and Off the Car Is an Important Direction of Vehicle Ergonomics. and it Is Also One of the Important Projects of Man-Machine Engineering Checking at Present. there Are Quantities of Factors Influencing Driver’s Comfort in the Process of Getting on and Off the Car, such as the Relative Position between the Driver’s Seat and the Steering Wheel, Together with the Instrument Panel, the Size Dimension and the Tilting Degree of the Doorframe of One Side of the Car, the Threshold Layout Position of the Front Porch of a Car, the Coordinates of the Point "R".
Development of an Autonomous Vehicle for the Cyclic Test
Authors: Choi You Jun , Moon Hee Seok
Published: September 2012

The cyclic test is becoming one of important tests in automotive industry. Various cyclic tests are needed to be done after new concept of product or technology has developed. However it is almost impossible to do same test at same test condition in real situation because it highly depends on test road condition or driving ability of the driver. Therefore, in order to perform same performance test repeatedly, this paper describes about system configuration and path following algorithm for the cyclic test of the autonomous vehicle. The areas discussed in detail include vehicle modification, controller design, system configuration, navigation and path following algorithm. The performance of the test vehicle is also described and evaluated by experiment in real environment.
Evolution Description of Service View within C4ISR Architecture Framework
Authors: Zhang Cheng , Wang Lei , Wei Ai Guo
Published: September 2012

At the C4ISR architecture designing level, in order to describe and analysis the evolution of C4ISR systems in the future battlefield environment due to the functional failure of the military system resources and the adjustment of operational process, this paper proposes an evolution description framework of service view product within C4ISR architecture and analysis the evolutional process of the service view product contrasting by the designing process. Because the evolution of service view under the above two conditions is both related the evolution description of the service interaction process model, in order to ensure the correct evolution of model, so this paper puts forward a set of evolutional operation of SOV-3 to promain the rational structure of process and analysis’s the effectiveness of resources to support the service nodes of the service interaction process model after evolution.
Research on the Equipment Overhaul Management System
Authors: Liu Jia Ni , Li Yuan , Chen Le , Sun Jian Bin , Shi Xin
Published: September 2012

Based on the demonstration of some problems exposed in the fields of PLA equipment overhaul, this paper put forward the design scheme of the equipment overhaul management system in view of information technology. It described the design objective of system, analysed system business flow, built system construction from two sides of software and hardware, and introduced the key technology and development platform for system implementation. This system has reading/encoding RFID card, photography, satellite positioning functions, which can automatically collect and transfer information during the process of the equipment overhaul. It is convenient for analysing system to office staff, and ensures the equipment overhaul expenditures was used reasonably.
Operation Safety and Emergency Disposal Decision-Making under Disastrous Conditions of Highway
Authors: Yuan Hua Zhi , Liu Jing , Han Yue Jie , Yan Ying , Chen Hao
Published: September 2012

In order to improve the operation safety under disastrous conditions of highway, the classification of highway catastrophic conditions was analyzed. And then the operation safety management and the kinds of countermeasure and foundation of decision-making for emergency disposal against disastrous conditions of freeway were put forward.
On Aero Control Law Joined Compensatory PID for Glide down to Fixed Low Altitude System and Simulation Researches
Authors: Yu De Hai , Qu Dong Cai , Lu Jian Hua , Lu Bin Wen
Published: September 2012

In order to improve accuracy of constant altitude fly at low altitude and fly track of glide down to fixed altitude, aeroplane’s control scheme of glide down to fixed low altitude with PID compensatory link were designed. At the same time, the corresponding control laws had been designed. After simple analysis about working principle of the aeroplane’s control system, simulation researches were done to optimize designed control laws, so that achieving expectant requirement. Simulation results show that designed control scheme and control law were accurate and effective.
An Evolutionary Method of Traditional Artificial Potential Field
Authors: Wang Shun Hong , Zhao Jiu Fen , Pan Le Fei , Liu Xin Xue , Zhang Bei
Published: September 2012

The problems of goals non-reachable with obstacles nearby (GNRON) and dead lock caused by local minimum were described when using Artificial Potential Field (APF) methods for mobile robot path planning in complex environment. Considering the geometric relationship of different obstacles, the heuristic factor of virtual attractive forces was introduced to solve the local minimum problem. Simulation results indicate that the evolutionary method of APF can realize optimal path planning in complex environment, which makes up the disadvantages of traditional APF method.
A Concise Numerical Model of Gas-Liquid Stratified Wavy Flow
Authors: Li Guo Zhen , Yuan Ya Lei
Published: September 2012

On the basis of the conservation law of the flow field and the two-fluid model, a one-dimensional steady state hydraulics model of the gas-liquid stratified wavy flow is established. The method accounts for the effects of the turbulence through the use of the standard K-ε two-equation model of turbulence with the wall function method employed near the wall. The gas phase and the liquid phase in the wavy region are considered respectively as two points for simplification. The model permits the prediction of flow parameters such as liquid holdup,pressure drop, velocity profile and so on. It is easy to calculate and the result is compared with the experiments and other models and agrees well with them.
A Study of Hazard Management Information System in Air Transportation
Authors: Yuan Le Ping , Sun Rui Shan
Published: September 2012

The objective of the research was to develop an advanced hazard management information system in air transportation system, which was a supportive tool for the implementation of safety management system and safety risk management. Firstly, hazard management process was outlined taking account of the regulator, the air operator/air navigation service provider/airdrome and their responsibilities, the process clearly showed the necessity of such a system. The system fulfills five basic functions: hazard log management, inspection service, alerting service, statistics service and system management, it matches the needs of daily hazard management. Furthermore, architecture of the system and key algorithms was discussed in the paper. By using web technology, i.e. JSP and MySQL, the hazard management information system was developed based on B/S structure. Application of the system will definitely facilitate safety risk management and make safety management more proactive and efficient.
General Design of New Medical Insurance IC Card System
Authors: Chen Jing , Chen Ke , Shang Xian Lian
Published: September 2012

This article has given one kind of IC card system based on EAS(Enterprise Application System)platform, Including system architecture description, the main module describes the structure and function. IC card system using the standard PBOC1.0 and Symmetrical key system ,can support three types of applications:Electronic wallet,Medical Insurance,Rechargeable card.This system have the main features of security ,flexibility, and already put into application.
Research of Maintainability Evaluation for Civil Aircrafts Based on the Motion Capture System
Authors: Wu Xu Dong , Liu Hu , Mo Song , Wu Zhe , Li Ying
Published: September 2012

Maintainability is a main design attribute of a civil airplane. So evaluation to the maintainability is very important for the design of the civil aircraft. The Human motion capture is a promising technique for maintainability evaluation. In this article, a method about the maintainability evaluation based on the optical motion capture system was presented. Then a test case was developed to demonstrate the feasibility of the method. The test case mainly focused on the accessibility of the civil aircraft.
Static Output Non-Fragile Control of Fuzzy Bilinear System
Authors: Zhang Guo , Zhao Yan Hua
Published: September 2012

This paper focuses on the problem of non-fragile static output feedback control for discrete-time fuzzy bilinear systems. Based on the parallel distributed compensation approach, the sufficient conditions are derived in the presence of the additive controller gain perturbations. The stabilization conditions are further formulated into linear matrix inequalities (LMI) so that the desired controller can be easily obtained by using the LMI toolbox.
Methods of Sensing Marine Plankton: A Review
Authors: Tan Shi Zhe , Huang Quan Ming , Wang Sheng Xu
Published: September 2012

Sensing marine plankton plays a key role in biological oceanography system. Lots of sensing marine plankton systems using different methods are developed so far with different functionality. In this paper, a systematic analysis of most methods used is summarized for direct sampling measurement, electron counting measurement, acoustic detection measurement and optical observation measurement. Technical and functional properties of developed devices are systematically analyzed and problems are also given. Finally, future needs and possible research directions are provided.
A Closed Steam Hood Control System of Paper Machine Based on S7-300 PLC
Authors: Wang Xi , Zhou Yang , You Yan Qing , Tang Wei
Published: September 2012

After introducing the principle of ventilation and dehumidification for closed steam hood, the key and difficulty points of its control are analyzed. Aiming at the production line of coating white board with surface sizing and high steam consumption, DCS system of steam hood based on SIMATIC S7-300 PLC is designed. The hardware structure and control algorithms are illustrated in detail. The control system has been applied on the paper machine with nearly 10 board paper plants of the coating white board paper base in Fuyang, Zhejiang province, and the good energy-saving control effect has been obtained.
A SEE Hardened Read-Out Circuit of EEPROM for Space Application
Authors: Zhou Xin Jie , Wei Jing He , Li Lei Lei
Published: September 2012

As wide application of EEPROM devices in space and military field, more and more researches focus on its radiation hardened characteristics in international. To improve the single-event effect (SEE) tolerant ability of read-out circuits in the memory, a radiation hardened circuit is designed. The design kernels of radiation hardened latch-flip are given and designed to resist the single-event upset (SEU) effect. A correction circuit is proposed to resist the single-event transient (SET) effect. The performances of this design are: SEU (LET)th ≥ 27 MeV•cm2/mg, SEL(LET)th ≥ 75 MeV•cm2/mg , read out time ≤200 ns. The new design not only satisfied the needs of present work, but supplies a worthful reference for radiation hardened circuit design in future.
Four Instructions CPU
Authors: Liu Hui , Ouyang Jian Fei , Liu Yuan
Published: September 2012

This paper introduces using digital electronic technology of knowledge and logic devices designed a four instruction set of the microprocessor, this processor enable the operation of eight-bit binary number. Complete hardware and instruction set of microprocessor design, the microprocessor can add two unsigned eight-bit binary number, subtraction, multiplication and division functions.
Integrated Instrument of Ultra-High Speed Data Acquisition and Storage
Authors: Diao Jie Tao , Wang Yi Nan , Sun Zhao Lin , Li Qing Jiang , Xing Jin Ling , Hou Yue Wei , Yu Hong Qi
Published: September 2012

Along with the rapid development of computer technology, high speed data acquisition and storage system has been widely applied in plenty of engineering fields, such as radar, aerospace industry, communication, etc. In order to satisfy the increasing requirement, we present the design structure of a novel integrated instrument for ultra-high speed data acquisition and storage, which is composed of ultra-high speed data acquisition, high speed data transmission and solid storage three main sub-systems. The detailed design and realization of the sub-systems are presented. We test and analysis the performance of the integrated instrument and the actual results show that the instrument performs stably and provides excellent speed and precision.
Study on the Control System of Dilution Water of Hydraulic Headbox
Authors: Wang Xi , Shan Wen Juan , You Yan Qing , Tang Wei
Published: September 2012

Headbox is one of the key components in a paper machine. Continual changes and improvements are undergoing for headbox in structure, performance and control owning to the increasing demands both on the speed of paper machine and on the quality of paper. Aiming at dilution water of hydraulic headbox, this paper based on OPC technology, collecting quantitative banner data from the host computer of the the QCS lateral control subsystem , sending this data to the PLC by MPI or Profibus ,then the headbox can be controlled effectively.
Research on FDIR Technology of Satellite Avionics
Authors: Jiang Lian Xiang , Xin Ming Rui
Published: September 2012

Fault discovery, isolation and recovery has become more and more important in the satellite avionics design with more and more autonomous and intelligent requirement to satellite. A brief review of fault discovery, isolation and recovery technologies are introduced in the sort of fault detection, fault isolation and fault recovery. A fault discovery, isolation and recovery system architecture for satellite avionics is proposed, the specific fault detection and isolation design is introduced in detail, the possible recovery solutions is also suggested.
Temperature Control System of Resistance Furnace Based on TMS320LF2407A
Authors: Wang Jin
Published: September 2012

Aiming at the long time-delay and nonlinearity of resistance furnace temperature control, this paper analyzes the shortcomings of PID algorithm, and puts forward temperature fuzzy control system design methods of resistance furnace based on TMS320LF2407A DSP. Fuzzy control algorithm is applied to change the output duty cycle of pulse width modulation (PWM) wave, which achieves power adjustment control of resistance furnace temperature. Through field debugging, the results show that this temperature control system has fast speed of the dynamic response and high steady-state accuracy, and prove that fuzzy controller design method and PWM control measures are correct and effective.
Design and Realization of Vehicle Exhaust Gas Measurer Based on CPLD
Authors: Huang Qi Zhi , Li Ke , Yin Kai
Published: September 2012

This paper presents a novel vehicle exhaust gas measurer based on CPLD. Because P89C668 single chip machine has only a UART, ISP programming port, micro-printer interface and last position machine communication port need to serial communication. To solve this contradiction, interface design is chose for EPM7128SLC84-15 chip, which single chip machine control and use one function. QUARTUS Ⅱsoftware development tool and VHDL program language are adopted. modularization programming mode of CPLD is compiled, which every module has a corresponding VHDL file. The results show that design cost is reduced 18% and development cycle decrease to 15 month, vehicle exhaust gas measurer can meet expectant request.
Design of Class D Amplifiers Using Zero Crossing Auto Gain Control
Authors: Wang Hai Shi , Zhang Bo , Sun Jiang
Published: September 2012

This paper proposes a method to control the gain of an amplifier. A 6-bit digital signal is used to control the gain of the amplifier by adjusting the resistance of a potentiometer. The change of the digital signal is allowed to change the gain of the amplifier only if the input signal of the amplifier crosses alternating current (AC) zero. The gain of the amplifier could be reduced or restored, which is based on whether the output signal of the amplifier exceeds a predetermined value or not. The method is verified in a class D amplifier. Road test shows that the method may eliminate the glitch caused by gain change, and the clamp caused by a too large gain.
Design Driving Circuit for Strain Gage Bridge
Authors: Gao Wei
Published: September 2012

The thesis analyses the noise of the strain gauge driving circuit in order to obtain high resolutions. With the analysis the thesis points out the methods to reduce the noise. The thesis also draws the conclusion that an amplifier with lower noise spectral density but wide bandwidth perhaps is not suitable for the driving circuit.
Application Research of MULTISIM for Electronic Technology
Authors: Zhong Hua Lan
Published: September 2012

This paper introduced the MULTISIM software and its application of electronic technology curriculum design method. The complex circuit analysis and design are finished using circuit simulation completion, changed the traditional design method.
RF Heat Treatment Based on FPGA
Authors: Fang Peng Fei , Zhao Ke Ting , Bao Ling Li
Published: September 2012

Heat treatment is used to tumors. In this paper, a novel system is proposed. Through DS18B2 collecting environmental temperature and FPGA, The system adjust the foreign output PWM waves to control the heating temperature in real time. The test demonstrated that the system achieve good effect in heat treatment.
Four Fold-Frequency Subdivision and Direction-Judgment Control Unit Design of SMC CE1 Cylinder Based on FPGA
Authors: Wu Bo , Cheng Bao Jie , Yang Liang Liang , Liu Ying , Cai Zhao Hui
Published: September 2012

In order to improve the displacement output signal resolution of SMC CE1 series digital cylinders, a four fold-frequency subdivision and direction-judgment control unit based on FPGA is designed. The performance of the four fold-frequency subdivision and direction-judgment control unit is studied by simulation. The research results show that the four fold-frequency subdivision and direction-judgment control unit can improve the SMC CE1 cylinder displacement output signal resolution from 0.1mm to 0.025mm, which proves the validity of the four fold-frequency subdivision and direction-judgment control unit. This four fold-frequency subdivision and direction-judgment control unit can be used in the pneumatic closed loop control system of SMC CE1 series digital cylinder and greatly improve the system control precision. And this kind of four fold-frequency subdivision and direction-judgment control unit is also valuable for the resolution improvement of other SMC cylinders displacement output signals.
Rapid Development Technology of Mobile Phone Shell Basing on the Selective Laser Sintering
Authors: Feng Chong You , Zhang Jin Mei , Zhang Zheng Yu , Li Li Ping
Published: September 2012

According to the characteristics of mobile phone shell, the mobile phone products model provided by Pro/E software, analyzed the technological parameters of warpage deformation influence, and designed the orthogonal experiment plan, Verified the plan on SINTERSTATION HIQ + HS selective laser sintering system, carried out optimum processing parameters of the minimum warping deformation.
A Novel Sampling and Holding Circuit for ADC
Authors: Hu Rong Bin , Liu Kun , Liang Cheng , Tang Jie
Published: September 2012

A novel S/H circuit is introduced in this paper. Every components of S/H circuit is described in detail. The stimulated results show that the S/H circuit has very good performance. The stimulate SFDR of the circuit is 89dB and SNR 78dB.
The Application Research of Fuzzy PID on Oil Low-Consuming System
Authors: Luo Dong Song , Zhao Hai Feng
Published: September 2012

In accordance with the phenomenon of 0# diesel be cannot used in winter of northern china, put forward the low consum-ing fuel system that diesel is heated to the set temperature in oil depot, for locomotive use 0# diesel fuel. heat exchanger as the control object in the system,firstly, the mathematical model of the heat exchanger is established.secondly, the transfer function using system recognition is getted.thirdly, the fuzzy PID controller is designed and simulation was done. the simulation curve was analyzed. Finally the conclusion is presented, which the fuzzy PID in this system is better than the traditional PID.
Research of Spurting Water to Lower Temperature System with Vehicle Brake through Auto Control
Authors: Li Ke , Xu Qing Feng , Zhang Wei
Published: September 2012

With the analysis of vehicle braking drum overheated which has caused brake invalid，this paper put forward a kind of research way to improve the problem of braking drum overheated. Through auto control it spurts water to lower the temperature to the overheated hub to solve the problem of brake invalid which is caused by braking hub overheated，improve the constancy of braking efficiency，guarantee the security of vehicle drive.
Research of Plastic Extrusion Blow Molding Parison Controllers
Authors: Gao Yong Xiang
Published: September 2012

Currently the plastic products are with complex and diverse structures. The putting forward of developing blow molding controller is of great significance speaking from wall thickness control. This article designs the extrusion blow molding controller from two aspects, namely, software system and hardware system, with the aim to achieve the reasonable thickness of controlled parison and improve the products’ competitiveness by greatly reducing consumption of the raw materials.
Design and Study on the Automatic Extrusion Device for Curved Chassis of Vibratory Feeder
Authors: Han Liang , Li Jia , Zhang Lei Xiang
Published: September 2012

Vibratory feeder is a device which is used to arrange small workpieces in neat rows and convey them from one place to another by vibratory feeding. It has been playing a key role in automation production. According to manufacturing equipments for the chassis of vibratory bowl feeder, this paper makes studies mainly in the followings: (1) introduces the principle of the vibratory feeder briefly, (2) the mechanical structure of the automatic extrusion device for curved chassis of vibratory feeder is designed, including frame, moulds and guiding mechanism, (3) static analysis, mould stress analysis are done by using the finite software ANSYS, (4) based on the electro-hydraulic proportional control technology, a hydraulic system is designed, (5) a control system based on STC89C52RC MCU(Micro Control Unit) is given. The problems of automatic extrusion for the curved chassis of vibratory feeder are successfully solved through the theoretical and experimental studies, which achieves the expected design goals and fills in a gap in this field in China, which brings great economic and social potential benefits and has wide application prospect.
Research on MPI-Based Parallel Max-Min Ant System
Authors: Liu Yu , Wu Guo Dong
Published: September 2012

When solving large scale combinatorial optimization problems, Max-Min Ant System requires long computation time. MPI-based Parallel Max-Min Ant System described in this paper can ensure the quality of the solution, as well as reduce the computation time. Numerical experiments on the multi-node cluster system show that when solving the traveling salesman problem, MPI-based Parallel Max-Min Ant System can get better computational efficiency.
Research on Optimization Method of S&T Projects Base on Fuzzy AHP
Authors: Lv Jing Gang
Published: September 2012

The technology industry development project is a carrier of technology industry. Scientific and fair projects optimization method can improve the efficiency of decision-making, the effectiveness of industry resource allocation and investment efficiency, the market competitiveness of technology products. With expert advice and relevant literature, we can establish a comprehensive evaluation index system of science and technology industrialization projects. Base on Tianjin city in the three same type of science and technology Industrialization Projects in 2010, by using Fuzzy AHP comprehensive evaluation, the projects were sequenced to determine the priority of the items, and then which provide a reference for policy makers.
Finding Out Biological Terms from Texts with CRFs for Reinforcement Learning
Authors: Wang Zhao Hui , Huang Wei
Published: September 2012

The rapid growth of biological texts promotes the study of text mining which focuses on mining biological knowledge in various unstructured documents. Meanwhile, most biological text mining efforts are based on identifying biological terms such as gene and protein names. Therefore, how to identify biological terms effectively from text has become one of the important problems in bioinformatics. Conditional random fields (CRFs), an important machine learning algorithm, are graphical models for modeling the probability of labels given the observations. They have traditionally been trained with using a set of observation and label pairs. Here we use CRFs in a class of temporal learning algorithms, reinforcement learning. Consequently the labels are actions that update the environment and affect the next observation. As a result, from the view of reinforcement learning, CRFs provide a way to model joint actions in a decentralized Markov decision process, which define how agents can communicate with each other to choose the optimal joint action. We use GENIA corpus to carry on training and testing the proposed approach. The result showed the system could find out biological terms from texts effectively. We get average precision rate=90.8%, average recall rate=90.6%, and average F1 rate=90.6% on six classes of biological terms. The results are pretty better than many other biological named entity recognition systems.
Research of Model and Algorithm of Multi-Item Spare Part Joint Replenishment Problem
Authors: Zhang Jian Rong , Yu Yong Li , Nie Cheng Long , Wang Jing , Luo Guang Ke
Published: September 2012

The research of joint replenishment problem in multi-item spare part inventory is an important orientation of inventory control, and it is difficult to solve. A model for continuity joint replenishment in stochastic demand is advanced. And the arithmetic is designed. Firstly, this arithmetic reserves reorder point of items according to the constraints of spare part supportability. Secondly, the cost and parameters of policy is computed. Finally, a solution is advanced for multi-item inventory cost. At last, the results indicate that the heuristic algorithm can effectively solve the problem.
A Fast Ray-Tracing Algorithm for X-Ray Imaging Simulation
Authors: Fu Chao , Shen Ao Dong , Luo Li Min
Published: September 2012

X-ray radiography has more and more application value and X-ray simulation system has practical significance for improving the quality of X-ray imaging and replacing the expensive devices but it’s a time-consuming work. This paper proposes an improved fast ray-tracing method extended from Siddon’s and Zhao’s methods. For a 2D array, we compute level by level which has natural modes, by comparing the incident x-coordinate with the characteristic constant. In the case of 3D models, the volume data are back projected into 1D linked list and compute indices and lengths similarly like the case of 2D. Compared with Zhao’s method, the new method avoids skipping parametric planes and computing several starting voxels and ending voxels in one level. The time consumed in the new algorithm has reduced by 5/6 regarding the conventional Siddon’s algorithm.
Research on Speed Changing Curve of Servo Turret Motor
Authors: Wang Yu Sheng , Wang Ming Ming , Zhu Xiang Jun
Published: September 2012

Because of such merits of servo turret like fast speed of tool changing, high accuracy of first location, simple mechanical structure, high reliability and so on, servo turrets are widely used in turning processing and turning and milling complex processing center.Control mode of servo motor speed is one of the critical problems in the designing of servo turret.S curve acceleration and deceleration control is to make the derivative of acceleration as constant in this procession, and maximize to reduce the impact of mechanical system by controlling acceleration derivative. Otherwise, by setting parameter or programming acceleration and its derivative, flexible acceleration and deceleration will be controlled to fit for different kinds of situation of machines.
A Novel Cluster Head Selection Algorithm Based on Energy Consumption for LEACH
Authors: Li Wen Hao , Wu Shao Chuan , Ye Liang , Shi Shuo
Published: September 2012

Wireless sensor networks are widely deployed in various areas of our daily life. The lifetime of wireless sensor networks takes significant effect in the performance of the whole network. Many network protocols are proposed to improve the lifetime of networks, and among them, low-energy adaptive clustering hierarchy (LEACH) is a promising protocol with self-organization of the clusters and periodic rotation of cluster heads selection to distribute energy consumption uniformly. LEACH performs well compared with other protocols on lifetime while it is simplified and has aspects to improve. In this paper, we modified the procedure of cluster heads selection in LEACH and proposed a protocol LEACH-CHE with consideration on the energy consumption of cluster heads. We analyzed LEACH-CHE and with the results of simulations, LEACH-CHE over performs on network lifetime compared with the original LEACH.
A Kind of Improved SPRINT Classification Algorithm Adaptive to the Change of Concept Drift
Authors: Zhao Jia Bing , Fu Chun Yan , Ge Mao Song , Zhang Li Ming
Published: September 2012

With the wide application of data streams mining, the study on data streams classification algorithm with concept drift has become an important piece of work. In light of the characteristics of data streams, this paper puts forward a kind of improved SPRINT classification algorithm adaptive to the occurrence of concept drift. It is proved by experiments that it can automatically adjust the number of training window and new sample during model reconstruction according to the current situation of concept drift and consume less sources and have higher classification accuracy.
The Study of Coded CPM Schemes
Authors: Su Lin Bo , Chen Jian Hua , Hu Ying Peng
Published: September 2012

Continuous Phase Modulation (CPM) schemes belong to a class of constant-envelope digital modulation schemes, the constant-envelope nature of the CPM signals makes them robust for the nonlinear and fading channels, and very useful for the satellite and/or the mobile radio channels. Comparing to PSK modulation, CPM modulation can not only provide spectral economy, but also exhibit a “coding gain”. CPM can be decomposed into a Continuous Phase Encoder (CPE) followed by a Memoryless Modulator (MM), this allows many new coded modulation schemes of combination of convolutional encoder and CPM modulator to be possible, such as serially-concatenated CPM (SC-CPM), SC-CPM with Convolutional Codes over Rings, pragmatic CPM (P-CPM), Concatenation of convolutional endocder and extended CE（CCEC）, etc. Some simulations show that these new CPM schemes can offer superior performance.