bluuebunny/crossref_metadata_2025 huggingface dataset:
Effect of LPC on the Corrosion Behavior of AZ81 Magnesium Alloy
Authors: Chen Jun , Li Quan An , Zhang Xing Yuan
Published: August 2014

The corrosion behavior of AZ81 magnesium alloy with the LPC addition has been investigated in this paper. The results show that with the addition of 1-5% LPC, the microstructure of AZ81 magnesium alloy is remarkably refined, and the spotted, high-melting point phase Al-RE intermetallic compounds is found in the alloy. The corrosion behavior of AZ81 alloy decreases firstly and then increases sharply with the increase of LPC addition. When the content of LPC is 2.5%, AZ81 magnesium alloy shows the lowest corrosion rate. The corrosion rates in 3.5%NaCl solution are always higher than those in 0.5%NaCl solution. The corrosion products from the surface are mainly composed of Mg (OH) 2 compositions.
Measuring Method and Device Microwave Cavity System Temperature Control Factor
Authors: Lei Hai Dong , Zhang Jian Jun
Published: August 2014

A new measuring method and device were proposed in this paper. It is about the cavity bubble system temperature control factor. It provides reference for research workers in this field. The method is applied in the passive atomic clocks technology, especially the integration filter resonance absorption cavity system temperature control technology.
Modeling and Movement Simulation of Tractor-Semitrailer
Authors: Liu Chuan Hui , Fang Yi , Du Feng , Shen Rong Wei
Published: August 2014

The Gim tire model was adopted to set up the nonlinear dynamic model of tractor-semitrailer. Choosing slip angle of tractor, yaw velocity of tractor and semitrailer as variables, the state space equation was proposed. Based on the established nonlinear dynamic model, simulation in Matlab/Simulink software environment was described. The simulation consults suggest that for tractor-semitrailer, it would lose stability with higher speed and bigger steering angle. The conclusion can be useful for the system design of tractor-semitrailer.
Research for PV Cell and Storage Battery of Dynamic Economic Dispatch in Micro-Grid
Authors: Liu Jiao Jiao , Wang Zhi Jie , Ye Yi Zhi , Zhang Zhen Hai
Published: August 2014

The method of day-ahead dynamic economic dispatch is applied to the micro-grid composed of photovoltaic (PV) generation system and batteries to make its operational cost minimized. The battery life was converted cost and added to the objective function. Micro-grid’s mathematical model of economic dispatch was set up. Mathematical model of economic dispatch was solved by using the method of real population genetic algorithm. The charge and discharge plan of battery in micro-grid and buying or selling electricity plan between micro-grid and State Grid was established at the same time. Taking real data of Shanghai Electric Group’s micro-grid for case study, the dynamic economic dispatch is compared with traditional dispatch strategy. The results verify the effectiveness of the dynamic economic.
The Creation of Virtual Assembly System Based on Virtools
Authors: Cheng Yan , Han Yun Peng
Published: August 2014

Aiming to improve the assembly efficiency of machinery products, a Virtools-based virtual assembly system is presented. Firstly, the framework of the Virtools-based virtual assembly system is proposed. Then, how the virtual scene built is introduced. Based on VE (virtual environment), combined with the data glove, the dynamic and interactive assembly is designed via the Virtools platform. Finally, the key techniques of supporting virtual assembly system such as collision detection are also studied by using the Virtools.
Analysis of Three Dimensional Nonlinear Coupled Finite Element Based on some Concrete Rock-Fill Dam
Authors: Jin Juan Juan , He Min , Liu Peng
Published: August 2014

As the future highest dam in the world, Shuang Jiang Kou rock-fill dam was the water retaining structure of homonymous hydropower station, a controlling engineering on Da Du River hydropower development, which is under design now. This dam is a central earth core dam with a height of 312 meters. A type of gravel soil stiffer than clay, which is made by artificial compounding of clay and gravel, is introduced to reduce the difference in displacement of earth core and rock filled shell zone. Because of the introduced less flexible central core, a more remarkable arching effect of the abutment on earth core might occur simultaneously. A three dimensional coupled nonlinear finite element analysis is carried out to study the three dimensional arching effect of Shuang Jiang Kou rock-fill dam. Computation results show that the arching effect is much notable. Then an innovation is proposed in design, in which a contact high-plasticity clay layer is introduced. It is verified that this innovation is effective and necessary.
Experimental Research of Laser Cutting 1Cr17Mn6Ni5N Steel Plates
Authors: Li Zhan Guo , Shi Yao Chen , Yuan Wei , Yang Xiu Guang
Published: August 2014

Due to complexity of laser cutting process and its many influence factors, this paper puts forward the evaluation method of laser cutting quality based on the difference of average upper and under kerf width from four points in two lines, systematically analyzes the influence rule and the influence degree of cutting speed, laser power, pulse width, repetition frequency on kerf width by laser cutting experimental study of 1Cr17Mn6Ni5N steel plates and provides a new method for evaluation of laser cutting quality and selection of optimal cutting parameters.
Automatic Evaluation Based on Computer Science
Authors: Li Bo
Published: August 2014

In this paper, we develop an automatic system which could help us to select or evaluate the most suitable target from a variety of candidates. Above all, we carry out an analytic hierarchy process including 3 levels with different factors. After combing with fuzzy comprehensive evaluation, we rank the candidates with final scores. More specifically, taking the selection of the best coaches of football in American universities as an example, a hierarchical structure it built, with coaches’ comprehensive capacity being the target level, their technical skills, competition records, and personal influence being criteria level, coaching experience, teams’ improvement factors, win-loss percentage, participation in highly-demanding competitions and awards of coaches being the corresponding index level. Then, we use cluster analysis to determine threshold of each index, and combine trapezoidal distribution function with fuzzy comprehensive evaluation to obtain the membership degree of the following five sectors: fully equipped, equipped, basically equipped, poorly equipped, not at all equipped. After scoring each coach, we obtain the final rank
Electronic Control Unit Design of Artificial Neural Network-Based Natural Gas Engine
Authors: Jiang Fen , Luo Zhen Hua
Published: August 2014

For nonlinear gas engine control system, uncertainty and complexity, this paper proposed electrical control design using artificial neural networks to improve the performance of electric and gas engines.
Microcontroller-Based Intelligent Traffic Signal Controller Design
Authors: Xu Hong Ke , Yang Jia Yu , Song Ming Qiang , Qu Yong Zhao , Wang Xiao Hong
Published: August 2014

With the road traffic congestion problems become more and more serious, and the current traffic lights don’t possess the function of revising timely and flexible, it can't meet the requirements of real-time controlling and make the traffic in intersection more efficient. The design of Microcontroller-based traffic signal controller fixes this problem. It based on STC90C51 as CPU solutions; LED lights and digital pipe were used as display module; 8 independent keyboards were used as the only manual input device; Software used the C programming language. The intelligent traffic light system covered the multi-phase and multi-period. So we could choose two-phase/four-phase/six-phase according to the particular road and traffic condition. Besides, it took the special status of emergency vehicles into account. It also had a manual input keyboard so that you could adjust the signal at any time. This design can effectively improve the traffic congestion problem.
The Advanced Control Technology in the Application of the Traditional Boiler Control
Authors: Zhao Rui Xia , Wang Xiu Ju , Teng Fei
Published: August 2014

Boiler is a complicated control object with multi-variable, strong coupling and uncertain time-delay. It is hard to get ideal control effect with normal controller. This paper presents the overview of advanced control techniques in traditional process control of boiler, such as PID multiplex control system, modern control system, intelligent control system, decoupling control system and robust control system. The future of advanced control research and application is also discussed.
Modeling and Simulation of Brushless DC Motor Speed Control System Based on MATLAB/SIMULINK
Authors: Yue Xue Lei , Bai Peng
Published: August 2014

Based on analysis of the mathematical model of the brushless DC motor (BLDCM), a method for modeling and simulation of BLDCM speed control system is developed in this paper. The simulation model of BLDCM could be established by combination of the functional blocks and S-functions in MATLAB/SIMULINK. In the double loop of control system, a PID controller was adopted in the speed loop and a current controller was completed in the current loop on the principle of hysteresis current track PWM inverter. The modeling method has merits in rapidity, practicality and has guiding significance to designing actual brushless DC motor control system.
A Novel Learned Model for Boundary Detection
Authors: Shao Ming Zheng , Qi Jian Feng , Chen Ya
Published: August 2014

Boundary detection is a critical, well-studied computer vision problem. Clearly it would be nice to have algorithms which know where one object stops and another starts. Traditional approaches look for intensity discontinuities in an image, however we believe that detecting boundary from a single image is fundamentally difficult, whereas machine learning techniques have a promising prospect on boundary detection. A novel learning model is proposed in this paper. Random decision forest classifier trained by human segmentation images will applied to determine the mapping from image patches to boundary probabilities. The results on BSDS500 dataset show that our model ties the performance of other competing approaches, but being magnitude faster than others.
Adaptive Sampling Based on GH-Distance for Realistic Image Synthesis
Authors: Wang Jian , Xu Qing
Published: August 2014

Realistic image synthesis technology is an important part in computer graphics. Monte Carlo based light simulation methods, such as Monte Carlo path tracing, can deal with complex lighting computations for complex scenes, in the field of realistic image synthesis. Unfortunately, if the samples taken for each pixel are not enough, the generated images have a lot of random noise. Adaptive sampling is attractive to reduce image noise. This paper proposes a new GH-distance based adaptive sampling algorithm. Experimental results show that the method can perform better than other similar ones.
An Improved BMQ Algorithm for Pattern Matching
Authors: Jiang Ya Ping , Tian Yue Xia , Zhao Jun Wei
Published: August 2014

Pattern matching algorithm is widely used. It plays an important role in information retrieval, data mining, intrusion detection and other fields. Among them, the BM algorithm is the most common. A new improved algorithm-BMQ algorithm is proposed on the basis of BM and related algorithms. The improved algorithm makes use of uniqueness and combination of the last character and next character of string, to increase the probability of the maximum right shift. Theoretical analysis and experimental comparison shows that the BMQ is better than BM algorithms in the process of string matching and string searching; in order to further verify its effectiveness, the improved algorithm is introduced to intrusion detection system, the experimental results show that BMQ algorithm improves the efficiency of intrusion detection.
Research on Electrical Characteristics of Metal Rubber
Authors: Chen Ya , Bai Hong Bai , Lu Chun Hong
Published: August 2014

Metal rubber is a new type of elastic damping material. It’s often used in all kinds of instruments and equipment to vibration isolation and buffer. The internal of metal rubber is mesh structure in space formed with wires. The contact points of the crossed wires aren’t solid collusion. Although the compressive strength of metal rubber is very good, but the structure of metal rubber would become loosly and destroyed under tensile load. Literature [1] put forward that the pulse discharge sintered to metal rubber can make the contact point transform to solid collusion. The method is based on the theory of resistance welding to the contact points between sintering metal wires in metal rubber. The research and analysis to the electricity characteristics of the metal rubber has important significance to optimize parameters of electrical pulse discharge experiment and improve the quality of sinter.
Research on Association Rule Mining Algorithm Based on Distributed Data
Authors: Luo Cheng , Chen Ying
Published: August 2014

Existing data miming algorithms have mostly implemented data mining under centralized environment, but the large-scale database exists in the distributed form. According to the existing problem of the distributed data mining algorithm FDM and its improved algorithms, which exist the problem that the frequent itemsets are lost and network communication cost too much. This paper proposes a association rule mining algorithm based on distributed data (ARADD). The mapping marks the array mechanism is included in the ARADD algorithm, which can not only keep the integrity of the frequent itemsets, but also reduces the cost of network communication. The efficiency of algorithm is proved in the experiment.
Research on Topology Association Rules Algorithm Based on Spatial Constraints
Authors: Tang Xiao Bin , Zhang Yi Zhi
Published: August 2014

Spatial topological relation is an important and typical multilayer spatial relation, when Apriori is used to mining spatial constraint topology association rules, it will has some repeated computing. And so this paper proposes an algorithm of spatial constraint topology association rules mining based on complement set, which is used to mining spatial multilayer transverse association rules with constraint condition from spatial database. This algorithm generates candidate frequent topological itemsets with constraint condition not only by down-top search strategy as Apriori, but also by computing complement set of candidate from down-top search strategy, which is suitable for mining any spatial topological frequent itemsets with constraint condition. This algorithm compresses a kind of spatial topological relation to form an integer. By the way, firstly, the algorithm may efficiently reduce some storage space when creating mining database. Secondly, the algorithm is fast to obtain topological relation between two spatial objects, namely, it may easily compute support of candidate frequent itemsets. Finally, the algorithm may fast generate candidate via double search strategy, i.e. one is that it connects (k+1)-candidate frequent itemsets with constraint condition of k-frequent itemsets as down-top search strategy, the other is that it computes complement set of (k+1)-candidate frequent itemsets with constraint condition. The result of experiment indicates that the algorithm is able to extract spatial multilayer transverse association rules with constraint condition from spatial database via efficient data store, and it is very efficient to extract any frequent topology association rules with constraint condition.
The Analysis of the Method of Screening Initiating Events Based on the Improved Borda Ranking Method
Authors: Zhang Yang , Zhao Ji Guang , Hao Jia Jie , Wang Ya Qi
Published: August 2014

IE is not only the important content in (PRA）, but also is the foundation of PRA. Analyzing the IE includes: identification, screening and grouping, however, there is no scientific method for screening IE. Therefore, a method for screening IE based on the improved Borda ranking method has been proposed. Firstly, we apply the Borda ranking method to make up the deficiency of the risk evaluation index. Also, combining with the characteristics of IE, which is the beginning of the event chains, we improved the Borda ranking method.Secondly, taking the Filling system as the research object, we analyze the portion IE causing the propellant leak, and apply the improved method to rank and screen IE. Lastly, comparing the results of improved method with index and traditional Borda method, also combining the actual engineering situation in filling system, we validate the correctness and effectiveness of the improved method.
The RFID Indoor Positioning Algorithm Based on Lagrange Interpolation
Authors: Bao Hui , Zhi Jiu Ying
Published: August 2014

This paper analyzes two classic indoor location methods based on Radio Frequency Identification (RFID),LANDMARC and VIRE,and presents a location method based on the lagrange interpolation.Make up for the inadequacy of VIRE algorithm uses linear interpolation to get the virtual reference tags signal strength value lead to inaccurate positioning.Then making improvement to weight definition to make it more accurately reflect the weight of each selected nearest label to get more accurate positioning results. The experimental results show that the improved algorithm is better than the original algorithm has better positioning results and stability.
Angle Estimation with Knowledge-Aided Constraint-Based Space-Time Adaptive Monopulse
Authors: Chen Gong , Xie Wen Chong , Wang Yong Liang
Published: August 2014

The principle and cost analysis of Constraint-Based Space-Time Adaptive Monopulse (C-STAM) are given. Based on the idea of cognitive radar, a novel Knowledge-Aided Constraint-Based Space-Time Adaptive Monopulse (KA-C-STAM) is proposed. With the knowledge given by a tracking filter in data processing, the KA-C-STAM improves the performance of angle estimation. Numerical examples verify the validity of the novel method.
On Subdividing of Hölder’s Inequality for Sums
Authors: Tang Hui Yu , Chen Guang Sheng
Published: August 2014

In the paper, we establish some improvements of Hölder’s inequality for sums.
Model Construction and Finite Element Simulate Based on Experiment Study of Magneto Rheological Finished Machine
Authors: Yang Hang Song , Li Peng , Gu Li Zhi , Guo Hui Juan
Published: August 2014

In this paper, turn the medium of magneto rheological liquid into continuation, and using of the critical Reynolds number determine method of liquid move state and compound with non-Newton fluid, get the conclusion of finished machine abrasive magnetic liquid fluid as laminar fluid, for having no mathematics’ model practical or be fit with the experiment, especially the distribution of shear and velocity stress, In this paper, using of the critical Reynolds number to determine the liquid state of magnetic fluid state, and in determined the fluid state, using non-Newton fluid dynamics and tensor analysis theory and also compound with the double dynamic viscosity model, analysis the abrasive magnetic fluid quality of kinematics shear stress, according to the quality, contracture the dynamic model of abrasive magnetic liquid finished machine, during the interfere, using the double viscosity fluid model, we may get the conclusion, liquid magnetic abrasive, when the shear stress more or less the bend stress, and mark with plasticity viscosity ηp0, ηpγ which round the work piece center, the velocity distribution as laminar, and also, analysis the flow field mathematics’ model by the finite element, and also going on the numerical simulate for the magnetic fluid velocity field of finished machine.
Research on Energy Recovery Damping Device of Vehicle Based on E-ACE
Authors: Cai Yuan Qi , Cao Jian Bo , Liu Zhi Yun , E Shi Ju , Wu Zhong Yao , Zhou Hong Bo
Published: August 2014

E-ACE (acrylic elastomer) is a kind of material so far in electro-active polymer (EAP) in the most excellent performance. Based on the analysis of the basic principle of the E-ACE power generation, the feasibility is studied on E-ACE power generation principle to achieve energy recovery and damping. Design a model damping device of vehicle for energy recovery based on E-ACE. Through analysis, when the system vibrates near the resonance frequency, deformation of spring is greater, E-ACE materials to move up and down reach the larger amplitude, and the more energy it produces. To analysis the system about harmonic response by ANSYS software, get the relationship between spring stiffness K, damping coefficient C and external incentive, then analysis the resonance frequency of the system. The simulation results verify the feasibility of the design scheme. Results show that E-ACE has excellent performance in the automobile vibration energy recovery and vibration. E-ACE will have broad application prospects.
Study of Form Control Algorithm in Atmospheric Pressure Plasma Processing
Authors: Li Duo , Wang Bo , Wang Jun , Xin Qiang
Published: August 2014

Atmospheric Pressure Plasma Processing (APPP) has demonstrated that it can achieve high removal rate and induce no sub-surface damage on the silica based material of optical surface. Compared with traditional mechanical polishing and ion beam figuring, APPP technology is cost effective and very promising in the optics fabrication field. In principle, Atmospheric Pressure Plasma Processing can be described by the two-dimensional convolution equation with dwell time function and plasma removal function. Thus, dwell time function can be solved theoretically by the process of de-convolution, which is the essence of form control algorithm. First, this paper compares and analyzes common de-convolution algorithms by the simulated processing. From the simulation results, the algorithm based on the principle of image restoration has good solving speed, high calculation accuracy. Therefore, we choose it as the form control algorithm for Atmospheric Pressure Plasma Processing. However, the high temperature of plasma plume results in the non-linear relationship between the removal depth and time, further affecting the stability of the algorithm. Then, using the actual experiment data, we build the nonlinear relationship function model to compensate the heat effect in the algorithm. Finally, the modified algorithm is verified by the 7um uniform removal on the fused silica using Atmospheric Pressure Plasma Processing.
Design and Implementation of Keyboard Module in V-Groove CNC System Based on LPC1343
Authors: Luo Jia Bin , Liu Jian Qun , Gao Wei Qiang , Chen Xin Du
Published: August 2014

The V-groove component which needs to be machined by ultra-precision CNC (Computer numerical control) machine tool is a core part in optical fiber connector. A design of keyboard module for V-groove ultra-precision CNC system based on LPC1343 is presented. This paper introduced the functions and features of LPC1343 and described the overall hardware structure of the keyboard module at first. Then the basic design, such as scan and decoding, design principle of module circuit and communication process between keyboard module and upper computer, were emphasized in detail. Afterwards, the functional design including data editing, LED indicator driving, override switch adjusting and motion control operating were also finished. A series of test have been conducted and the results have shown that this kind of keyboard module is reliable and stable.
Development of Interface Card Drivers Based on Matlab/xPC Target
Authors: Bi Yong Li , Yang Dan
Published: August 2014

Constructing the semi-physical real-time simulation system with Matlab/Simulink, the interface cards are used to transmit information with the external equipments. The real-time operating system based on Matlab/xPC Target almost doesn't support the drivers provided by the interface card manufacturers. In order to meet the requirement to construct the semi-physical real-time simulation system with Matlab/Simulink and utilize effectively the newer kind interface cards, it is very significant to develop the interface card drivers based on xPC Target. With the example of PCI-1710 data acquistion card in the paper, the drivers were developed based on xPC Target with S-function. In addition, the performance of the drivers were tested. The results show that the drivers have the characteristics of convenient use, good real-time performance, strong portability etc. This has the certain guiding significance for developing drivers for the various interface cards based on xPC Target.
A Sequential Numbering Power Flow Calculation Method for Distribution Network
Authors: Meng An Bo , Huang Qin Yi
Published: August 2014

As distribution network is of radial pattern, the forward and backward substitution algorithm and its variations are widely used for radial distribution network power flow calculation, which needs to form associated admittance matrix and matrix operations. This paper proposes a sequential numbering power flow calculation algorithm for distribution network. Based on the graph theory of nodes, the proposed method can handles multiple branches radiation network.. In the simulation test, our proposed algorithm is applied to a typical radial distribution network in order to verify the efficacy on power flow calculation. The results show that the sequential numbering power flow algorithm has good performance in terms of convergence rate and reliability.
A Study on Energy Consumption Optimization for Cooperative Beamforming in Wireless Sensor Networks
Authors: Yang Guang You , Gan Xiong , Zheng Tuo , Ma Zhi Yan
Published: August 2014

In wireless sensor networks where the volume and energy of nodes are limited by batteries, which are difficult or prohibitively expensive to replace or recharge in the most of its application scenarios, so improving energy efficiency has very important significance.Cooperative beamforming forms virtual antenna arrays by multiple adjacent wireless sensor nodes, which improves the signal strength at the receiver and reduces the energy consumption of the transmitter by multiplexing gain and interference management.In this paper, the problem of energy consumption optimization for cooperative beamforming in wireless sensor networks was studied. First, considering both amplifier energy consumption and circuit energy consumption,energy consumption models for both broadcast phase and cooperative beamforming phase was presented.Then,we propose a two-step optimization to minimize the total energy consumption by optimizing the modulation parameter and the number of cooperative nodes.We simulate the total energy consumption for various transmission distances,modulation parameters , path losses and the number of cooperative nodes.The numerical results show that,for different system parameters, selecting the optimal modulation parameter and the optimal number of cooperative nodes can reduce total energy consumption and improve energy efficiency.
Analysis and Evaluation of Artillery Fire Simulation Test
Authors: Gao Ting , He Chi , Fan Zhao Jun , Guo Hong Li
Published: August 2014

The artillery test of firing simulation provides the similar dynamic recoil effects of artillery, by means except firing. It is more safe and convenient with less ammunition and time consumed. This document describes the meaning and content of the artillery test of firing simulation. It analyses the feasibility of this test technology by calculating and comparing the experimental data of guns and makes a research and analysis for current situation and development of the related technology In the domestic and overseas. Through fuzzy comprehensive evaluation (FCE) and analysis hierarchy process (AHP), a comprehensive assessment on different simulation techniques is done. A research direction on the artillery test of firing simulation is proposed, which can meet the requirements of the development of modern artillery.
Experimental Study on Dry Finishing of Low-Speed WEDM
Authors: Wang Tong , Lu Yu Mei , Wang Sun Fei , Yin Hong Shi , Ge Jun
Published: August 2014

In order to further improve the surface quality in LS-WEDM, a new procedure as Gas-liquid Combined Multiple Cut (the finishing is in gas) is presented and has carried on the contrast experiment to conventional WEDM multi cutting processing in the paper. the single factor and orthogonal experimental design method were used to study Effects of pulse duration, pulse interval, peak current, servo voltage and servo feed on roughness in finishing in gas, By range analysis, analysis of variance and the binary table the optimum level of the above five factors was found in consideration of the above five factors interaction. The paper provides basis for advanced study of finishing process of LS-WEDM.
Research on the NC Woodworking Curve Band Saw CAM
Authors: Chen Yan , Tan Jian Hao , Zou Xiang Jun , Chen Li Juan , Li Bo , Wang Jing
Published: August 2014

To achieve the processing program and simulation verification on NC Woodworking Curve Band Saw (WCBS) that facilitates the industrialization and practicality of the woodworking machinery, the articles proposes the CAM system modules by the analysis of its composition structure and working principle of the machine and the building-up of its kinematics model. The article also explains the basic functions for each module and develops the CAM systems of MJS1325 WCBS with the use of VC++ and OpenGL. Reading and analyzing the CAD work piece graphics files, the CAM systems is able to generate the NC program and realize the simulation of machining in whole visual process environment including saws, fixtures, belt saw and work piece, etc. The CAM systems pass the prototype test and see a favorable effect.
Technical Study of Laminated Template Electroforming in Fabrication of Metal Parts
Authors: Fan Hui , Zhao Yang Pei
Published: August 2014

Laminated templates electroforming (LTE) is one kind of metal-parts directly forming technologies which are based on discrete/accumulation theory. This paper introduces the forming principle, equipment configuration and experimental studies. By using templates as auxiliary tool and jet electroforming as filling method, the current density of electroforming was significantly improved and a group of copper parts in specific shape were fabricated. Experimental results show that on-load voltage, nozzle diameter, spray distance, spray flow velocity have direct influence on processing speed and locality. A small diameter of nozzle and short spray distance helps to achieve a precise locality and good dimensional accuracy, after process parameters have been optimized.
Model-Based Design and Implementation of an Ultrasonic Elliptical Vibration Cutting Device
Authors: Hu Lin Hua , Zhou Ming , Zhang Yu Liang
Published: August 2014

Due to intermitted cut characteristics, ultrasonic elliptical vibration cutting offers many benefits e.g. reducing tool force, improving surface finish and extending tool life. This paper presents the model-based development of an ultrasonic elliptical vibration cutting device with 1st resonant mode of longitudinal vibration and 3 rd resonant mode of bending vibration. The development of the device was assisted with the finite element program ANSYS. Based on theoretical and experimental studies, the requirements of the device are estimated. The maximum displacement amplitude of the ultrasonic elliptical vibration cutting device is 13.1μm and 8.3μm for bending vibration and longitudinal vibration respectively at an exciting voltage of 400Vp-p.
On the Size Effects in Micro/Meso Upsetting of Brass H62 at Elevated Temperatures
Authors: Wang Hao Yan , Yao Zhe He , Mei De Qing
Published: August 2014

Micro/meso forming, as an emerging manufacturing process for miniature metallic workpieces, has attracted great attention since the 1990s due to its high production efficiency, low material waste and high precision. Due to the so-called size effects in the scaling down, many traditional theories in metal forming cannot be simply applied to the micro/meso forming. In this study, the micro/meso upsetting experiments of Brass H62 were conducted at various temperatures. The stress−strain curves in the experiments were measured and compared. The effects of the temperature and the sample size on the flow stress were discussed. It is found that the flow stress of the material decreased with the decrease of the sample size at room temperature. However, the flow stress of the material may increase with the decrease of the sample size at elevated temperatures. The results indicate that the size effects in the micro/meso forming are significantly affected by the processing temperature.
Generator Stator Bar-Ends Cure-Heating Monitor System on Fuzzy PID
Authors: Tan Xiao Dong , Wang Xing Xing , Chen Jiang
Published: August 2014

The process of electric generator stator bar-ends cure-heating is a key step during the generator production. However, since the cure-heating system is a non-linear and one-step inertial system of great coupling. Because of the resistance wire (or wire rod body resistance), air convection, the temperature and other environmental factors, it is difficult to establish accurate mathematical mode. The traditional PID control system does not achieve the desired effect. On the one hand, its overshoot is so large that the tolerance can be up to 6, on the other hand, it is difficult to regain balance once the system is perturbed.
The paper makes a thermal chemical analysis of the cure-heating system, then builds a thermodynamics model. To control the non-linear and one-step inertial system, it adopts the method of Fuzzy self-tuning PID parameters to adjust the PID parameters including, and the output according to the real-time heating temperature feedback, thus, controlling the heaters action to achieve the objective of heating temperature control and solving the strong-coupling between the multi-loops of heating and improve the automatic control degree of the cure-heating control system. By simulating in MATLAB and analyzing the simulated results comparing Fuzzy-PID control effects with traditional PID, the results show that the method of Fuzzy-PID control which is used to realize the real-time control of temperature in the stator bar-ends cure-heating system can exert strongpoint and avoid shortcoming of those two control methods. As it can not only exploit the advantages of Fuzzy control, such as strong Robinson Crusoe, fast response time, small overshoot, but also possesses the high quality dynamic tracking function and better static precision of PID control, it is a superior excitation temperature control scheme for stator bar-ends cure-heating system.
The Analysis of the Life of Conveyer-Belt on a Hydraulic Tensioning Device
Authors: Tan Xiao Dong , Song Pi Wei , Li Yang
Published: August 2014

This paper analyzes the life of a kind of conveyor belt, based on the theory of the hydraulic tensioning device. Hydraulic tensioning device is a kind of machine which detects the real-time force in the conveyor belt. When the force is lower than the enactment value, the device will tension the belt to make it lager, in case of the belt skids. When the force is higher than the enactment value, the device will stop tensioning the belt. Based on the relationship between the effective strain and the life of the conveyor belt, simplify the real problem. Draw a curve of the relationship between the effective strain and the life of the conveyor belt by Matlab which can educe the stop tensioning value. Based on the theory of classical mechanics, the paper gives out the start tensioning value. At last, this paper gives out the reasonable range of the strain of the conveyor belt.
Design of the Output Performance Test System of Permanent Magnet Linear Force Motor
Authors: Cheng Xin Xin , Pan Xu Dong , Wang Guang Lin
Published: August 2014

Electrical energy directly converted into mechanical energy of linear motion by linear force motor, greatly enhancedthe rapid response ability and control precision of the feed system. The product quality of linear force motor can be effectively improved by design a performance test system of linear force motor. The paper designed a performance test system of linear force motor based on the Labview virtual instrument platform, and test project of linear force motor has been planned, the test method, the structure of the test device, power drive module, step motor load part, data acquisition and the software system all have been completed. The test system realized automatic and manual two different kinds of test methods, data acquisition and management and processing function and the good human-machine interface, the linear force motor dynamic and static parameter, including input current, output force and output displacement and the relationships between them have been tested.
The Virtual Design of the Self - Propelled Tomato Harvester
Authors: He Yu Jing , Wu Ang , Li Yan
Published: August 2014

In order to improve the efficiency of life, reduce the labor intensity, On the basis of agronomic requirements, design a new type of tomato harvesting machine.Virtual design is aimed at cutting device,transporter,fruitseedling separating device,internalconveyer, transverse conveyer, Ascension conveyer, color select set, telescopic boom. By cutting machine, through a series of excluding foreign body, direct transportation loading, finished the harvest.The machine harvesting, transportation, separation and color to choose, and other functions in one body, make the post-harvest processing tomato can achieve enterprise standards.
The Research on Red Light Ranging Float Pneumoelectric Conversion Technology
Authors: Pan Xu Dong , Li Bo , Wang Guang Lin , Zhang Guo Yue
Published: August 2014

This document explains how to transform an ordinary float-type pneumatic measuring instrument by adding a right lights sensor on it. Then we design a suitable float for it through the theoretical calculation and the simulation with Fluent. At last, the research do a series of experiments and by the experiments, its nonlinear error is less than the ordinary float-type pneumatic measuring instrument. So the whole instrument is feasible. The final purpose of designing the float-type pneumatic measuring instrument based on the red lights sensor is to measure the overlap of the valve core & sleeve of the slide valve.
Static Performance Analysis of Foil Thrust Bearing Based on Thin Plate Theory
Authors: Zhu Jian Jun , Du Jian Jun , Li Bing , Li Chang Lin , Liu Dun
Published: August 2014

The thrust foil bearing, as one of the key parts in high-speed rotating machineries, is used to sustain the axial force, and its load performance has a crucial relationship with the structural parameters and working condition. In this paper the top foil is modeled as a thin plate supported by the bumps underneath. The finite element method (FEM) is used to calculate the structural deformation coupled with the pressure distribution obtained through the solution of Reynolds equation by the finite difference method (FDM). The effects of structural and operating parameters, such as rotational speed, eccentricity ratio, top foil thickness and bump foil thickness on the load capacity and frictional torque are discussed in detail. The results show that the increase of rotational speed, eccentricity ratio and bump foil thickness is beneficial to increase the load capacity and frictional torque. The effect of variation of top foil thickness on load capacity is not obvious, which implies that the top foil plays a role in building the lubricant surface rather than providing supporting stiffness.
Modeling and Control Simulation for the Multi-Range Hydro-Mechanical CVT
Authors: Zhang Ming Zhu , Zhou Zhi Li
Published: August 2014

To develop the control system of multi-range hydro-mechanical continuously variable transmission (HMCVT), a model of a multi-range HMCVT is built using the principle of dynamics. According to the characteristic of power split, HMCVT is separated as axes set, variable displacement pump-motor system, clutch set. With wheel tractor as application instance, the whole model of vehicle power train is made, which includes the engine, HMCVT, running system and control system. Based on the theory of Finite State Machine, an automatic control method of speed change and range shift is present, which employs the throttle value, engine speed, range number and transmission ratio as the control parameters. The dynamic characteristic of automatic speed changing and ranges shifting is simulated. The result indicates that the model can correctly represent the dynamic characteristic of HMCVT, the engine can run at the optimal working point, the multi-range HMCVT can shift range steadily and change transmission ratio continuously when the load changes, the circularly shift range is avoided. The model can be used conveniently for the analysis of vehicle dynamic performance and the research of multi-range HMCVT control method.
The Design of Rolling Steel Computer Aided Manufacturing System Based on Internet
Authors: Yu Feng Qin , Wang Jun , Wu Feng He
Published: August 2014

The production of rolling steel is a complicated process which includes management of production operations and production process. The former includes costs accounting, procurement plan of raw materials and auxiliary materials and quality control. The latter includes devices, technology and production rhythm of iron making, steel making, casting and rolling. Nowadays, the departments of these two have adopted the computer managing system to improve the efficiency of management. But the concept of collective design of CIMS is not considered thus the computer control system and operations management computer system are isolated. Furthermore, resources are not shared and information is not integrated among the systems thus enterprise competitiveness decreases. This paper designs the rolling steel computer aided manufacturing system based on internet and introduces the three levels system structure of CIMS technology strategy as well as the key technology. This study is of great significance not only in the integration of rolling steel production systems and the sharing information, but also in upgrading the steel enterprises, reducing costs and increasing enterprise competitiveness.
Research and Development of CA6140 Virtual Assembly System
Authors: Li X.M. , Shen Ya Lin , Zhu L.H.
Published: August 2014

On the basis of analyzing assembly process of main structural components in CA6140 lathe, 3D models for those components were established with CAD software UGNX6.0. Virtual assembly and motion simulation of the structure parts were performed with virtual technology. A set of virtual assembly system of CA6140 engine lathe was developed with programming software Visual Basic 6.0. It contains six main modules about spindle box, feed box, apron, tailstock, turret, etc. Dynamic simulation and motion simulation of the corresponding components in entity lathe can be realized, respectively. And also, mechanical structure, working principle, assembly relation between different components and motion transmission process of the lathe can be realistically reproduced with the system. This virtual assembly system not only can be used to analyze and transform old products, but also can be used in new products development, and to some extent, can be used to replace the prototype. It is an indispensable tool in the employee training and mechanical engineering activities.
Research on Simulation of Non-Orthogonal Multi-Axis NC Machining and Post-Processing Technology Based on the Coordinate Transformation
Authors: Qu Shao Kui , Gu Li Zhi , Wang Jian Tao , Du Wei Wen , Huang Yan Hua
Published: August 2014

The technology of NC machining simulation is a reflection in virtual environment. Machining simulation may effectively reduce the invalid feeding and probability of interference or collision between cutter and fixture due to unreasonable machining parameters. Researches on machining simulation of multi-axis NC machining are complex and representativeness. This paper took a process of surface under NX CAM environment on a non-orthogonal five axis machine tool—DMU50eVolution as the object for machining simulation, by inputting the proper engagement for the cutter, using the method of coordinate transformation to create a post processor with UG post-builder and integrated into the library of post-processing. The NC codes created have been verified in the simulation system with VERICUT. And it has been shown that the preparation time of NC machining has been reduced, the efficiency of NC machining improved and the phenomenon of collision and interference effectively prevented.
Research and Development of Intelligent Programming Technology of LGMazak Turning Center
Authors: Sheng Ze Hong , Xu Wan Hong , Wang Wen Hui , Li Yong Xiang
Published: August 2014

In order to fit the intelligent development of NC programming system, through in-depth study to master the internal structure and structural principle of NC turning center, this paper developed the innovative NC programming model using common G-code based on its original MAZATROL conversational programming capabilities, and further implements the G-code programming model embedded into its specified MAZATROL conversational programming model, which not only can reflect the versatility of the common G-code programming model, but also can bring into play simple and easy maneuverability of MAZATROL programming model; Finally, by running NC program to perform the trial turning test on NC turning center, the test results verify that the nested NC programming model developed by this paper can effectively solve the tedious and error-prone manual NC programming problem, which greatly reduces the programming and debugging time, improves utilization of NC machine tools, and ultimately has brought significant economic benefits. Therefore, the research results of the paper will provide a simple and effective and practical way to improve the programming efficiency, and have important application value to further enhance the programming intuitive research of NC turning center.
Research of the 3D Splicing Technology Based on the Binocular Vision
Authors: Xie Ming Hong , Wang Chang Bo
Published: August 2014

In order to achieve three-dimensional automatic splicing from the multi-angle, the paper presents a new splicing method. The method utilizes the invariance of the spatial characteristics of the characteristic landmarks and then marks the characteristic landmarks by introducing the angle collection between the characteristic landmarks, and match in space for the characteristic landmarks within two perspective regional based on this characteristic collection. This method eliminates the tedious encoding process of the landmarks, so improves the spatial matching rate and ensures the matching accuracy. In addition, in the process of striking the three-dimensional coordinates of the landmarks, this paper strikes image coordinate of the characteristic signs circle center by introducing the regional connectivity feature flag. This method eliminates interference from unwanted areas, and distinguish between the various signs round independence and improves the strike rate of the circle center. At the end rotation matrix R and translation vector T of the coordinate system normalization are solved by the quadruple method. Examples show that the algorithm has strong robustness, can realize quickly, automatic stitching for the visual data, and has the very good practical value.