bluuebunny/crossref_metadata_2025 huggingface dataset:
Research on the Application of 20 Degrees Probe Pair in TOFD
Authors: Hao Xiao Jun , Zhao Ji Feng , Niu Xiao Guang , Liu Chang Fu , Li Wen Bin , Zheng Xiang Feng
Published: August 2014

The feasibility of the application of probes with refraction angle of 20 degrees is discussed, and application effects of the probe are verified by experimental testing. The result shows, for ultrasonic TOFD testing of small flaws in lower part of high-wall-thickness work-pieces, the probe pair with refraction angle of 20 degree is superior to 45 degrees.
Design on Engineering Database of Bridge Seismic CAD System
Authors: Yang Xiao Min
Published: August 2014

Engineering database was the core of Bridge Seismic CAD System. It was a new engineering database for bridge seismic design based on relation database and data characteristic of bridge seismic design. The engineering databasewas suitable for storage and managing data of bridge seismic design, it was also created condition for data storage andmanagement of Bridge Seismic CAD System.
An Improvement of Local Fractional Integral Minkowski’s Inequality on Fractal Space
Authors: Chen Guang Sheng
Published: August 2014

In the paper, we establish some improvements of Minkowski’s inequality on fractal space via the local fractional integral.
An Improvement of Minkowski’s Inequality for Sums
Authors: Tang Hui Yu , Chen Guang Sheng
Published: August 2014

In the paper, we establish an improvement of Minkowski inequality for sums. Its reverse version is also given.).
Research on the Forward Euler Difference Method for Parabolic Equations
Authors: Li You Guo , Dong Yuan Fei
Published: August 2014

This article is devoted to the forward Euler difference method for the parabolic equation. In this paper, a forward Euler difference scheme is derived. It is shown that the forward Euler difference scheme is convergence and stability. Moreover, a numerical experiment is conducted to illustrate the theoretical results of the presented method.
Oil Film Flow-State Analysis of Hydrostatic Vertical Guideway of CNC Vertical Lathe Rail Head
Authors: Zhang Yan Qin , Yu Ze Yang , Li Wei Wei , Yang Xiao Dong , Shao Jun Peng , Yu Xiao Dong
Published: August 2014

Hydrostatic lubricated vertical guideway is commonly used as a form of rail head bearing lubrication in CNC vertical lathe lubricated bearing. In order to improve the cutting performance of CNC equipment during machining, we have studied the hydrostatic vertical guideway with inner slide during the process of ram feed moving in this paper. The single rectangular cavity flow equation and velocity equation are derived. Numerical simulation of taking limit working conditions that the cutting force is taken byis studied by the Finite Volume Method (FVM). The flow field and velocity distribution of X direction and Y direction of hydrostatic vertical guideway are obtained by using quantitative method and supplying oil with a single chamber, with the inlet flow of 0.52L/min, with the film thickness of 0.023mm and the depth of oil cavity of . The mathematical model by theoretical derivation and the flow state regularity in limit working conditions are verified and revealed. The results of study above in this paper provide valuable theoretical basis for hydrostatic guideway design in practical projects.
Melted Characteristics Effects of Shielding Gas on Laser Deep Penetration Welding
Authors: Wu Qiang , Xu Lan Ying , Mao Yong
Published: August 2014

Adopting coaxial and side blown protective gas to control plasma, many experiments of CO2 laser deep penetration welding on the stainless steel are finished. Considering the protective gas effect of melten characteristics on laser welding,the experiments choose the gas species and composition to promote the collision and energy exchange of gas and plasma; The laminar flow state is holded by controlling the gas runoff, the angle and direction, increaseing the gas stiffness to prevent plasma punctured, and the plasma energy exchange range is close on the surface of the workpiece so that the energy of laser beam is less absorbed by plasma than the workpiece.The experiments indicate that shielding gas suppression are adverse factors on plasma to use alone Ar, He and N2. Adopting He-Ar-N2 and the ratio of 7:4:l as a protective gas when gas flow rate is about 30L/min, the deep and wide ratio is large,the deep penetration welding seam surfaces obtained are smooth,the defects aren't obvious;the protective effect is poor if the gas flow is too large or too small.
Control of Solidification Process and Surface Microstructure of Large Size Ingot ZALCu5MnA Alloy
Authors: Xu Lan Ying , Wu Qiang , Tang Yong
Published: August 2014

Compared with conventional ingot, difficulties in melting and casting of large size ZALCu5MnA alloy is due to the increase of ingot size, which lead to a depth increase in smelting bath process, mixing melting liquid is also difficult, and chemical composition of molten pool is not uniform. this paper uses finite element method to analyze the temperature field and thermal stress field of large size ingot of alloy in solidification process, heat transfer model, radiation the boundary condition and latent heat of solidification processing are discussed meanwhile the microstructure of the casting parts surface and center are related researched.
Acoustic Properties of Materials for Vibration Reduction and Resistance on Ultra-Precision Machine
Authors: Huang Dan , Wang Ying
Published: August 2014

The porous ceramic holds good potential as acoustic resistance and vibration reduction material during ultra-precision machining. Porous materials absorb acoustic energy by friction with the air that moves inside the pores, and in this paper, the motion is simplified as the incompressible fluid in a single cylindrical pore. The analysis and calculation results show that the acoustic coefficient of porous ceramic is a complicated wave function and the acoustic absorption coefficient calculation model is feasible based on fluid thermal viscous theory. The acoustic absorption coefficient of porous ceramic increases with the increase of thickness, and its period and amplitude decreases with the increase of porosity of ceramic.
Design of a Detecting System for the Welding Surface of Forging Steel Structure Piston Based on Ultrasonic
Authors: Zhang Hong Yang , Zhai Shao Peng , Qu Meng Meng , Zhai Peng
Published: August 2014

A new type of forging steel structure piston was introduced. Due to its features of structure and detection requirements, a detecting system used for the detection of its welding surface was designed, which is based on ultrasonic flaw detection technology. The probes posited under the end plane of the piston, facing accurately to the welding faces which contains of the inside ring and the outside ring. Using the longitudinal wave method after being water coupling, the detections can be detected. The detection theory, the hardware composition of the system, the software functions and the detection result were described in detail. The hardware structure of this system is simple and reliable; the software module is clear and stable and has very high flexibility, easy to modify and extend. The system has been applied to the actual production process, the performance has been verified. A nondestructive testing equipment of good performance for the forging steel structure piston’s quality control was provided.
Experimental Research on Laser Transmission Micro-Joining Based on the Mask
Authors: Fan Cai Lian , Liu Hui Xia , Zhao Zhen Guan , Wu Yan Wei , Wang Xiao
Published: August 2014

With the demand of high-quality and aesthetical products in the domain of medical microbiology, it’s more and more important to join micro weld. Due to traditional joining methods’ difficulty in meeting the demands, laser transmission micro-joining is of great significance. The materials used to laser transmission micro-joining based on the mask are PET, and the experiments are conducted on diode laser. The weld geometry with different gap widths on the mask is demonstrated at the same process parameters. In addition, the causes of forming different morphologies are analyzed. The formation mechanism of weld is analyzed as well. Moreover, process parameters’ effects on joint strength and joint width are deeply explored when gap width on the mask is 0.3mm. The results show that100 um micro weld joint is realized. At the same time, the range of process parameters is determined.
Face 3D Modeling Based on Projective Rectification
Authors: Zhang Ke , Gao Zhao
Published: August 2014

Face 3D modeling is the difficulty problem in the field of computer graphics, computer vision and artificial intelligence. In recent years, it has become the most active research focus both at home and broad. 3D modeling of face is the key step to realize face recognition, and the technique of face 3D modeling has obtained extensive applications in many fields, such as film, animation, interactive games, video conference, human-computer interaction, reverse engineering, medical and public safety. In this paper, the technology of face 3D modeling based on projective rectification is presented and the reconstruction of face 3D digital model can be achieved by it. Firstly, BP neural network is used to simulate the mapping relationship between the 3D object and its images. Then, the rectification on the left and right images acquired by stereo vision system is implemented according to the principle of epipolar line constraint. On the left and right rectified image planes, the match researching of corresponding points are reduced from 2D plane to the horizontal lines, so the image matching and face 3D modeling can be implemented efficiently.
Study on the Influences of the Structural Parameters of Hydraulic Engine Mounts on their Vibration Isolation Characteristics
Authors: Li Qian , Sun Ying , Huang Ying Ya , He Gang , Zhu Deng Lin
Published: August 2014

Hydraulic engine mounts (HEMs) are important vibration isolation parts in vehicle powertrain mounting systems. The structural parameters of HEMs are the main factors which determine their vibration isolation characteristics. It is of great significance to discover the influences of the structure parameters on their vibration isolation characteristics in the design and study of HEMs. HEMs with different rubber materials, lengths and cross-sectional areas of the inertia tracks are designed and manufactured, and their frequency response characteristics are investigated by experimental and analytical methods. The influences of these structural parameters on the vibration isolation characteristics of HEMs are educed. The analytical methods and conclusions are instructive for the design and tuning of the vibration isolation characteristics of HEMs.
Strength Calculation Method and Parametric Method of the Turbine Shaft
Authors: Zhou Si Zhu , Yi Wen Jun
Published: August 2014

The working principle of turbodrill is discussed in this paper, through discussing the structural characteristics of the turbine shaft, it is pointed out that the part where minimum axis diameter of the turbine shaft is, the hollow area of the turbine shaft, and the hollow place where is the thread at the bottom of the turbine shaft are the three most dangerous parts. With the structure of the turbine shaft of 195mm turbodrill as an example, the strength calculation methods and calculation results of the three most dangerous parts are given. Through comparative analysis on various advanced international parametric design platform, the SolidWorks is chosen as a basic platform for parameterization, this paper puts forward the parametric method of 195mm turbine shaft and the series design of turbine shaft have been achieved. The strength calculation method and parametric method of the turbine shaft have been developed and used in the series design in Yangtze university of China.
The Theoretical Analysis and Experimental Study on the Distribution Characteristics of Motion Parameters in the Process of Honing Gear
Authors: Zhang Cheng , Liang Guo Xing , Lv Ming , Wang Shi Ying
Published: August 2014

Gear honing processing is a kind of processing method which belongs to the point-contact generating gear finishing. Its movement form is equivalent to a pair of gears transmission which the surface of the gear-honing-tool is adhered a layer of grinding grain. When it works in rolling processing, the contact-point between the workpiece and gear-honing-tool is moving. Then the moving point becomes a line in the space, and with the gear-honing-tool being in axial play, a standard flank of tooth is finished. Using the gear meshing principle, kinematics model of relative sliding velocity in the contact-point between the workpiece and tools is established, based on which the contact-line equation. and acceleration equation. at the contact-point are derived. The contact-line is solved in a given parameters of the workpiece and tool in MATLAB. The theoretical derivation and experimental results show that the speed in diverse along the direction of the tooth depth is the main reason for the roughness value and surface texture of workpiece. The acceleration of contact-line at the tooth flank is different, and it is leading reason that the processed workpiece gears appear profile distortion. Finally, the testing system is established for researching honing gear process. It is showed in the results that the acceleration difference can lead to the CBN abrasive falling away from gear honing tool, and even the "anti-cutting" phenomenon.
Experiment and Optimization of Settling Effect of Drip Streaming Filter
Authors: Wu Su Zhen , Yang Han Song
Published: August 2014

In this thesis, by changing the filter overflow tube insertion depth of spin streaming filter, combined with the existing drip irrigation equipment change the structure parameters of spin streaming filter. Using Fluent software to choose reasonable turbulence model for numerical simulation analysis, contrastive research on the field test was carried on, reveals the relationship between the internal flow field pressure and the flow rate. The sediment production increased before they are reduced with the increase of the overflow tube insertion depth. It should choose the optimal insertion depth according to the specific use and usage model of hydrocyclone in actually use. The variation trend of internal flow field pressure and the flow rate when selected structural parameters changed are also analyzed. With the increase of insertion depth, the axial velocity and radial velocity of sand and water inside the hydrocyclone shows the tendency of decrease. Furthermore, the field experiment verifies the simulation result, thus proving the feasibility of using Fluent computational fluid dynamics software to simulate the internal flow field of the spin streaming filter. The research results will provide referential basis for the design and application of the drip filter system.
Study on Geometrical and Working Properties of the Parabolic Moldboard
Authors: Li Peng , Gu Li Zhi
Published: August 2014

Three forms of model parabolic bulldozing plate were designed and manufactured. Their macroscopic soil-engaging surface directrixes consist of parabolic curve and the cutting angle were 50°, 55°and 60°respectively. The working resistance was measured by a homemade indoor soil bin. The parabolic moldboard model with a cutting angle of 55° has the least working resistance. On this basis, the parametric equations of three kinds of macroscopic soil-engaging surface of parabolic type moldboard were established. The intrinsic geometrical quantities of the macroscopic soil-engaging surfaces, including the first base quantity (E, F, & G) and the second base quantity (L, M, & N), were calculated. Compared with the working resistance test results of the three moldboard models, it is found that there is a specific range of E value in first base quantities and L value in second base quantities which can make the soil-engaging surface to obtain lower resistance. This research provides a reference for the resistance-reducing and energy-saving design of macroscopic soil-engaging surface of moldboard.
Research on Brake Shoe Eccentric Wear Mechanism by Analytical Method and Virtual Experiment
Authors: Qu Bao Zhang , Zhang Hong Bo , Lu Bi Hong , Liu Zhen Ming
Published: August 2014

In this paper, a theoretical mechanical model for the brake shoe is set up according to the foundation brake unit of railway freight cars, and it indicates that the friction moment is the origin resulting in brake shoe eccentric wear. On this basis, the pressure distribution formula on the brake shoe is derived when the train brakes in forward and backward direction respectively. The analysis results show that if the wheel and the brake shoe are concentric, the ratio of the revolving-in end pressure to the revolving-out end pressure in wheel forward revolving is larger than that in wheel backward revolving. It is consistent with the phenomena that upper eccentric wear often appears on the brake shoe in practice. Further research reveals that the degree of the eccentric wear is determined by the braking force action style, which is the theoretical basis for the design revision. In addition, the RecurDyn Multi-body Dynamics software is used to build the rigid-flexible coupling dynamics model for the foundation brake unit. The simulation experiment verified the analysis result. The research outcome provides the theoretical basis and technical support for further design improvement of the foundation brake unit in railway freight cars.
Impact Analysis of the Force Environment on the KDP Crystal Harmonic Loss Considering the Frame Surface Topography
Authors: Wang He Ran , Liu Hai Tao , Liang Ying Chun
Published: August 2014

The large diameter-thickness-ratio KDP crystals are the main optical element in Inertial Confinement Fusion (ICF) device to realize the harmonic generation, thus they need to maintain high quality surface figure, and therefore, research on the influence of force environment (including clamping force and gravity) on harmonic loss is quite necessary. In this paper, grinding mount surface topography is simulated by the fractal theory; contact and clamp FEM model is established; four parameters are proposed to present non-uniform clamping force; the mathematical model between crystal mechanical performance and the harmonic loss is established; and finally the impact of clamping force and gravity on the harmonic loss is obtained. The calculation results have guiding significance on the design of clamping force magnitude and configuration and crystal working gesture.
Research on the Kinematic Characteristics of Digging Tree Mechanism of Tree Transplanter
Authors: Zhao De Jin , Guo Yan Ling , Song Wen Long
Published: August 2014

In order to study the kinematic characteristics of the tree transplanter and the hydraulic cylinder, this paper established the model of the tree transplanter with the Cero2.0 software and analyzed kinematic characteristics of the hydraulic cylinder and the tree spade when the tree spade was driven by the hydraulic cylinder with the analytical method. The dynamic simulation curves of the angular velocity and the angular acceleration of the hydraulic cylinder can be obtained with the Matlab software. Then the appropriate format model file was imported into Adams software, and the angular velocity and the angular acceleration of the hydraulic cylinder were analyzed and simulated in Adams. The obtained curves in Adams software were compared with the curves obtained with the Matlab using the analytical method. The result revealed that the trends of the two ways simulation curves were consistent. The comparison showed the analytical method of kinematic characteristics of the tree transplanter and hydraulic cylinder was correct.
Project Decision-Making for Conceptual Design Based on Rough Set
Authors: Yuan Ming Hai , Cheng Shuo , Dai Zhi Yong , Ji Ai Min
Published: August 2014

Rough set has been applied into the conceptual design of products in order to choose the structure correct project rapidly according to the users’ demand. First of all, using rough set, the relation between features has been found out to set up the simple decision-making table and get the regulations of the project decision-making. According to the decision table, the redundant project is deleted to choose the correct project rapidly in the stage of conceptual design. The example of the rapid design of an astronomical doom shows this method is more objective and concise than those conventional methods and the processing speed is much faster.
Experimental Study of Laser Direct Joining of Metal and Carbon Fiber Reinforced Nylon
Authors: Huang Chuang , Wang Xiao , Wu Yan Wei , Meng Dong Dong , Liu Hui Xia
Published: August 2014

This paper presents an experimental study to evaluate the feasibility, characteristics and mechanism of laser direct joining between metal and carbon fiber reinforced plastic (PA66CF20). This study presents a method to improve the joint strength of the metal-polymer hybrid joint. The investigation study effects of process parameters (laser power and travelling speed) on the quality of joining joint. Macroscopic morphology of joint and PA66CF20 melting region closed to the interface were observed in this study. XPS analysis shows that Ti-C and Ti-O chemical bonding were produced between titanium alloy and plastic. Cross-sectional photo showed the melted polymer flowed into micro-cavity of metal surface caused by roughness of metal and thus formed mechanical bonding. Finally, the titanium alloy surface was structured in four different surface textures using a pulsed laser. Then the metal was joined with the plastic. The result shows that the joint strength of metal after laser-structured joining with plastic had been improved greatly.
The Strength Reliability Analysis at Connecting Region of Cylinder and Skirt of Coke Tower Based on Stochastic Finite Element
Authors: Zhang Ya Xin , Gao Qi , Xu Xiao Zi
Published: August 2014

In this paper, Based on the original operating parameters of the Coke tower which works in the PetroChina Dushanzi Petrochemical Corp, and the skirt - tower body support section as the research object, using stochastic finite element method and Monte Carlo method, 60 groups of pressure, temperature are extracted randomly as variables in the original operating parameters curve, the change of the distribution function of temperature and pressure are analysed and established, and 200 groups of random pressure, temperature variable array is produced based on this; The maximum stress in dangerous section corresponding to each array is obtained by using the finite element method, the stress distribution of the probability density function is obtained; The strength reliability analysis of dangerous section is completed by using stress strength interference model and combining with the material intensity distribution function. The analysis results provide the basis for the tower life prediction and predicting repair, and provide a method for reliability analysis of the equipment whose large size is hard to measure and the working environment is hard.
Rotational Velocity Influence Research on Pressure Field of Hydrostatic Bearing with Constant Flow
Authors: Dai Chun Xi , Shao Jun Peng , Zhang Yan Qin , Yu Xiao Dong , Wu Bo
Published: August 2014

Large size hydrostatic bearing is the core component of heavy CNC equipment. The influence of pressure, heating and running time can reduce film thickness during operation. This will directly affect machining accuracy and operation reliability of the entire machine. Aiming at the problem of influence of rotational velocity on carrying capacity of heavy hydrostatic bearing, use finite volume method (FVM) to simulate gap film pressure field of heavy hydrostatic bearing with Constant Flow and study pressure field distribution law on the conditions of the different rotational velocity and same cavity depth, oil cavity area, then optimize oil cavity structure. Results show that, pressure field distribution law of the different rotational velocity is basically identical, but its carrying capacity is different. From the relation curve of the pressure and rotational velocity can be seen, because of the dynamic pressure of existence, along with the increase of rotational velocity, carrying capacity gradually. The study is of vital theoretical significance for the improvement of machining accuracy of numerical control machine and the entire CNC equipment and provides valuable theoretical basis for the design of hydrostatic guide rail in engineering practice.
Research on the Adaptive Zero Phase Error Tracking and Proportion Composite Controller of Continuous Rotary Electro-Hydraulic Servo Motor
Authors: Wang Xiao Jing , Sun Gui Tao , Xian Chang Fu , Li Song , Cao Jian , Wan Cao Lei , Xiu Li Wei
Published: August 2014

According to the poor tracking accuracy of periodic signals for continuous rotary electro-hydraulic servo motor, the mathematic model of the electro-hydraulic position servo system of the continuous rotary motor was established, a composite control strategy combining with proportion controller and adaptive zero phase error tracking controller was designed. The working principle of composite strategy was given, and the composite strategy was verified on Co-simulation of MATLAB and AMESim platform. The simulation result shows that the amplitude attenuation and phase delay of the tracking curve which excitated by the sinusoidal signal 0.5degree and 10Hz for continuous rotary motor is less than 1.2% and 1.08°respectively, and the efficiency of the composite controller is verified through simulation.
Study on Control of Automatic Feedingin Condom Detection Line
Authors: Ying Zhu , Fu Yi Li
Published: August 2014

To the condom automatic feeding module in condom detection line, we designed a control system based on PLC, gave the reasonable control scheme, selected a specific PLC model andcompiled the PLC ladder program. Then we did the control experiments on transfer module of the feeding system. Experimental results show that the structure and the control scheme are feasible to achieve the intended function.
Design of Fruit Picking Device Based on the Automatic Control Technology
Authors: Zhao Dong Hui , Zhang Hui , Hou Jun Xing
Published: August 2014

£oWith our country's labor cost increase and forestry operations to improve the degree of automation, the automatic picking device will be gradually adopted to pick fruit in the future. This paper discusses the design process of intelligent mobile platform, five axis manipulator, end effector, electrical control device which belong to the automatic fruit picking device. The device is installed in the automatic navigation system and visual identity system, can accurately locate the position and pick fruit. The CAD/CAE software device was mainly used to design and analysis model, and design efficiency, feasibility and scientific were improved. According to the current development trend of fruit species gradually increased, the manipulator hand can adjust, which can pick the different shapes of fruits, and is installed with a visual sensor, pressure sensor, position sensor in the manipulator, and the finger stress analysis was made. In addition, the application of S7-200 model of PLC and pneumatic technology is used in the picking device, so that the overall structure is compact, more stable.
Kinematics of a 6-DOF Feeding and Unloading Manipulator
Authors: Zhao Da Xu , Di En Cang , Shou Guo Zhong , Gu Yu Qi
Published: August 2014

In order to improve the efficiency of kinematics modeling in analyzing robots, this document used Lie groups and screw theory to describe rigid motion of the robot system, established a kinematic model of operating arm based on Product of Exponentials (POE) formula, and analyzed forward and inverse kinematics of chain topology structure robot, as well as several sub-inverse problem of inverse kinematics. A 6-DOF series-wound configuration loading and unloading manipulator has been used as an example, its kinematics equations are established by POE formula combined with screw theory, the special configuration of end effector under a specific task planning are calculated using Mathematica software. By contrast with D-H parameters method, we can draw a conclusion that POE formula and D-H parameters method are essentially equivalent. However, POE formula and motion screw have more definite geometric and physical meaning, neat expression form, convenient algebraic operation, are able to overcome limitations, such as calculation complexity and singularity in solving process, can meet kinematic analysis and real-time control of robot.
Motion Control for a Stingray-Like Robotic Fish with Undulating Pectoral Fins
Authors: Wang Yang Wei , Gu Bao Tong , Tan Jin Bo , Sang Peng Fei
Published: August 2014

Stingrays have expanded and highly flexible pectoral fins that extend over the entire length of their body. Locomotion is controlled by modulations of the undulating fin surface which produce steady swimming, acceleration, or complex maneuvers. In this paper, a robotic fish inspired by stingray was presented. Structure of the biomimetic prototype and layout of the control system were illustrated. In order to mimic the undulations, parameters of the biomimetic pectoral fin need to be accurately controlled including frequency, amplitude, wavelength, and undulatory mode. Several control strategies were proposed to realize different kinds of locomotion. Lastly, swimming experiments were carried out in the water tank according to the control methods. Experiment results demonstrate the viability of our methods.
A Kind of Active Control Damping Shock Absorber
Authors: Yang Han Song , Li Peng , Gu Li Zhi , Guo Hui Juan
Published: August 2014

It is the main decrease press type used in high speed train of semi suspension system, as the parameter can not be regulated freely of the semi suspension system, to design a kind of damping shock absorber which with the sensitive and soft system are very important, this system which using of the Electro hydraulic proportional valve to regulation the safety valve, the guide valve and the damping force of shock absorber, get the recycle method of the hydraulic system from inner to outside, and also using the suspension active control variable damping shock absorber to detect the road, this device, in fact, by vibration, which let the valve move relation, turn the mechanical energy into hot and release outside, thus decrease the vibration. To design this variable damping shock absorber ,compared with the semi suspension system ,for it has the connect system and Electro hydraulic proportional valve, and with the road detectors, and various variable parameters, Which let the high speed train more stable and safety, overcome the short of parameter regulation for the semi-automatic suspension system.
Adaptive Video Image Enhancement Algorithm Based on FPGA Design
Authors: Wu Li Ming , Yang Shi Long , Li Fu Jian , Luo Xin , Li Bing Jing
Published: August 2014

Aiming at the problem of image quality degradation due to scenes change rapidly, an image enhancement algorithm based on scene intelligent identification is proposed. The algorithm sharpen the image detail by using Laplace operator. Determines the change image scene according to the gray value, constructs different gray mapping function, and adjusts gray value range of image adaptively to improve the contrast ratio of image enhancement. By using parallel processing, the algorithm has high execution efficiency, so it can meet the real-time processing of HD video. Experimental result shows that the proposed algorithm has satisfying performance in the rapidly change scene.
Application Analysis of Machining Simulation and Post-Processing of NC Turning Center
Authors: Ge Shu Yun , Qiao Xiang He , Ye Yao , Chen Hao Hao , Li Yong Xiang
Published: August 2014

NC machining simulation, as one of the key technology in the field of CAD/CAM, can effectively check out the interference collisions that may occur in the machining process, significantly improve the safety usage of NC machine tools, has important practical significance to prevent the occurrence of machine accidents. Based on the integrated simulation module of UG NX software, this paper established the simulation model of NC turning center and elaborated the establishing process of machining simulation system, including the creation and verification of tool path, the digital model assembly, machine driver and motion model and so on. So tool path simulation and processing simulation were achieved, and the phenomenon of over-cutting and under-cutting between the parts and the cutting tool can be discovered timely. Meanwhile, on the basis of UG/Post module, the special postprocessor for NC turning center was developed to automatically output NC program, and the generated NC program can directly enter the NC machine tool for processing without manual modification, which will improve the efficiency and quality of automatic programming of machine tools, thereby shortening production cycle and reducing processing costs. Finally, the product processing examples verify the correctness and practicability of the special post-processor and process simulation system.
FRACAS Based Failure Information Management for High-Speed Train
Authors: Qu Bao Zhang , Zhang Bing Hai , Lu Bi Hong
Published: August 2014

Failure, because of the important role in the product life cycle for improving product design and manufacturing, is becoming important data information and being taken seriously. High-speed trains are complex electromechanical integration systems, and its failure occurred in operation may directly relate to people's life and property safety. FRACAS is a reliability engineering method, which allows the product fault information to follow Discovering, Report, Analysis,Correct andConfirm closed-loop management process, provides data and information to support effectively for improving the reliability of the train. This paper analyzed the fault information management needs of high-speed trains, combines high-speed trains product structure tree and fault model base to generate a high-speed train fault information database, by customizing and developing Relex FRACAS software. Then high-speed trains (CRH3) closed-loop management system is established. High-speed train FRACAS can easily build enterprise information platform for product reliability. Through the establishment of a unified failures database and solutions knowledge base, standardized information transferring and sharing are achieved. The train products faults can be timely reported and corrected. The accumulated data of troubleshooting in the whole process can be used in the failure statistical analysis and reliability prediction, which can effectively avoid major failures and repeated failures.
Hardware Development of CNC System Based on OMAPL138 and FPGA
Authors: Li Jia Jian , Liu Jian Qun , Zhang Ping , Gao Wei Qiang
Published: August 2014

In order to realize high speed, high precision, high reliability, miniaturization performance of the CNC (Computer numerical control) system, this paper proposed a hardware platform of embedded CNC system based on OMAPL138 and FPGA. OMAPL138 is a SOC using C6748 DSP kernel and ARM9 kernel dual-core structure, the kernel frequency can achieve up to 375/456 MHz. ARM kernel of the CNC system which runs the Linux operation system is responsible for task management, DSP kernel is in charge of real-time interpolation and look-ahead algorithm, and FPGA module generates pulses to control the movement of the servo motor. Firstly, the overall hardware architecture of the embedded CNC system was designed. Meanwhile the hardware circuit design of CPU core module based on OMAPL138, human-computer interaction module, EMIFA bus interface of the FPGA core module were emphasized in detail, and also the serial port, Ethernet, USB communication interface module were introduced. A serial test experiments have been conducted and the results have shown that this embedded CNC system is powerful and stable.
A Probability Distribution Model for Optimal Selecting Cooperators in Supply Chains
Authors: Chen Guo Rong , Deng Ju Li
Published: August 2014

The cooperator’s optimal selection is a difficulty in manufacturing supply chains, but the complex networks developed rapid recent year provide us a new method. It proposed a probability distribution model for optimal selecting cooperator in supply chains. Analyzed the growth of Manufacturing Supply Chain Network Relationship Graph (MSCNRG) firstly, and put forward a probability distribution function consisted with degrees, relationships and conditions of the vertices; some experiments were carried out to check the model. The results of probability distribution model provide a novel method to analyze the optimal selecting cooperators in supply chains.
Molecular Dynamics Simulation of Surface Effect on Tensile Deformation of Single Crystalline Copper
Authors: Gao Qiang , Guo Yong Bo , Liang Ying Chun , Zhang Qing Chun
Published: August 2014

Based on molecular dynamics method, the tensile process of single crystalline Cu nanorod and single crystalline Cu bulk were simulated at atomic scale. The motion of atoms, total energy of atom-strain curves and number of dislocation atom-strain curves during the tensile process were acquired. The results shown that surface effect has a significant effect on the tensile mechanical properties of single crystalline Cu nanorod. For single crystalline Cu nanorod, the energy of atoms in the edges and surface were higher than the energy of atoms inside the nanorod. Dislocations nucleation in the edges that with high energy and extend along the {111} crystal plane. The nanorods produce plastic deformation and shows excellent ductility under the "dislocation nucleation-energy rising and dislocation layers cross-slip" mechanism of the alternating cycle. For single crystalline Cu bulk, dislocation nucleation randomly and extend to the entire simulation model along the {111} crystal plane quickly. The single crystalline bulk Cu produce fracture under the "microscopic vacancy-microscopic hole-penetration of microscopic holes-fracture" mechanism.
A Resilient Novel Compressed-Domain Audio Recognition Method for Anti-Linear Speed Change
Authors: Wu Li Ming , Han Wei , Li Yao Fei , Zhou Song Bin , Chen Si Cheng
Published: August 2014

Audio fingerprint technology has been increasingly played an important role in audio content identification, audio information security, industrial process monitoring, etc. Due to compressed format has become the main way for audio files storage and transmission, it owns more practical significance that directly extracting audio fingerprint from compressed-domain. In general, existing compressed-domain audio fingerprint schemes are robust to common time-frequency-domain distortion, including noise, echo, band-pass filtering, 32Kbps@MP3 and others. But they are difficult to deal with large linear speed change distortion which is a frequent audio processing means in the field of television and broadcast. This paper proposes a novel compressed-domain audio recognition algorithm, which can resist linear speed change in the range of-10% to 10% (recognition rate is higher than 90%), via extracting fingerprint after do Fourier-Mellin transform for sub-band energy sequence of MDCT spectrum. This is enough to cope with almost all situations of audio acceleration/deceleration occurred in commercial application. In addition, it shows similarity in other performance compared with existing excellent compressed-domain audio recognition algorithms.
Conceptual Design of Mobile Phone Based on TRIZ Theory
Authors: Zhang Jian Yi , Jiang Jin Gang , Lv Qiang , Xu Dan Yang
Published: August 2014

Aiming to the young people’s requirements on mobile phone design, market research for target population is done. Requirements on mobile phone design are found. Compared to existing mobile phone, the direction of mobile phone conceptual design is planned. A novel conceptual mobile phone is designed based on TRIZ theory. Based on TRIZ theory, the solution process is simple, has clear goal, and the effect is outstanding. So TRIZ theory is a good way of innovation.
DCM Oriented Operation and Maintenance Expense Model for High-Speed Train
Authors: Lu Bi Hong , Li Yu Kai
Published: August 2014

Manufacturing is in transition to manufacturing service industry and Life Cycle Cost (LCC) becomes an important considerate index. Operation & Maintenance Expense (OME) is the most complicated one among all the LCC expense units. Besides, it also accounts for the largest proportion. Authors proposed a LCC modeling idea, which is Expenses attached to the process, while process consumes resourses. Authors take the air-supply and brake system of high-speed train as example, conduct the system’s maintenance FMEA and risk assessment based on dependability. According to assessment results, authors match the system’s important maintenance projects, including brake control system, main air compresser etc., with their respective maintenance mode. The paper put forward the expense model of one specific maintenance work on basis of its resourse structure. Based on the main air compresser’s dependability, authors predicted its Corrective Maintenance (CM) repair times by using Monte Carlo simulation. Combined with the repair times of Preventive Maintenance (PM) and condition-based maintenance, authors obtained high-speed train’s OME model. This method has important significance for modeling the high-speed train’s LCC. Besides, it may support the expense reseach for large equipments with complicated process.
GA-Based Proactive-Reactive Scheduling Mechanism for a Flexible Job Shop Problem under Multi-Uncertainty
Authors: Wang Jun Liang , Zhang Jie , Qin Wei
Published: August 2014

This article investigates the flexible job-shop scheduling problem (FJSP) with multi-uncertain. A proactive-reactive scheduling mechanism is put forward to against the fluctuating process time and equipment breakdowns. This mechanism consists of two stages, including proactive scheduling stage and reactive scheduling stage. In the proactive scheduling stage, the redundancy-based technique is used to generate robust baseline schedules; in the reactive scheduling stage, a reactive scheduling is adopted to rectify the predictive scheduling to adapt to the occurrence of machine failures. Based on this, an integrating algorithm is presented with the goal of the make span. Numerical experiments show that the proposed algorithm has a better performance than Genetic Algorithm (GA) on flexible job-shop scheduling problem under processing time uncertainty and the reactive scheduling algorithm can handle the equipment breakdown with little robustness lost.
Study on the Grind-Hardening of the Loader Clevis Pin
Authors: Liu Ju Dong , Zhuang Jie Zhen , Xu Zhi Long
Published: August 2014

On the basis of the cylindrical plunge grinding and intermittent axial feed grinding experiment, the grind-hardened layer structure and its property of the loader clevis pin were studied. The result shows that there are some arc shape medium/high-temperature tempered zones and some annular unhardened zone in external circumference surface, which is result of temperature gradient, induced grinding heat when circumferential feed and axial grinding heat conduction. The microstructure of hardened zone is mixture martensite, and the microstructure of tempered zone is tempered martensite and troostite. Different structure zone has same microhardness distribution regulation, but the microhardness of hardened zone can reach 640HV0.5. The loader clevis pin processed by grind-hardening meets the property request for working.
Research on Removal Mechanism and Surface Features of Al2O3 Engineering Ceramics in Ultrasonic Lapping
Authors: Zhang Chang Juan , Tong Jing Lin , Zhao Bo , Jiao Feng
Published: August 2014

Ultrasonic lapping can effectively improve machining efficiency and obtain higher machining precision, which can be as the final process. This paper discusses the ultrasonic lapping mechanism through simulating the lapping tracks. Based on the contrast experiments between common and ultrasonic lapping, the influence of different lapping parameters on material removal rate and surface roughness were studied and the surface microstructure of workpiece was analyzed. The experimental results show that material removal rate of ultrasonic lapping is nearly two times that of the common lapping, especially in ultrasonic axial lapping, and the better surface quality can be obtained during ultrasonic lapping. Meanwhile, the reasons for material removal rate increasing and surface quality improving were analyzed.
Research on Aluminum Strip Winding Machine CNC System Design
Authors: Li Ge , Wang Ya Ping , Shi Yun Peng , Shi Chang Xuan , Ying Yu Xiang , Zhou Jian
Published: August 2014

Winding machine is a kind of special equipment which is used to produce fin tube. At present winding machine in China mostly belongs to the semi-mechanized and semi-manual operation, with low efficiency, small size and unstable quality, which cannot meet the requirements of modern enterprise production; hence it is necessary to develop a winding machine with automatic processing ability and high precision. In this research the control system of winding parts of Aluminum strip minding machine was studied. Based on the analysis of the overall structure of winding machine control system, the hardware components, speed of running, the application of the position control system were observed. The processing parameters, the control algorithm and a module I/O assignment of TRIO motion control card were obtained. The analysis of critical point in programming conducted was realized and the control system software was designed.
The Wireless Network Routing Protocols and Data Communication Methods for Multiple Sensor Information Used in Mining Mechanical
Authors: Wang Meng , Tang Xin Yu , Zeng Wen Xiao , Zhou Jun Lin , Zhang Rong Hui
Published: August 2014

In view of the development of wireless sensor system data transmission model in mine mechanical, we construct a ground reflection model of double path combined with the actual background demand based on the analysis of the wireless network routing protocol. Firstly, we put forward the selection strategy on wireless communication transmission power of multiple information sensor nodes. To build a data communication mode, we proposed the selection and evaluation method of network parameters based on graph theory. In consideration of the wireless channel model, combined with the initial random layout problem of network node, we explore whether to be neighbors between any two nodes arranged at random and the constraint relationship of wireless communication distance between nodes. Finally, we make up a dynamic routing selection algorithm with a view to dynamic nodes, and conduct the simulation analysis and experiment design. The research results show that with the increase of the random movement speed about network nodes, the process of depleting the energy of the nodes in the wireless sensor network speeds up, which explain the protocol given in the paper requires more energy to cope with the problem that the network topology changes frequently because of the random motion of nodes in network. The research results provide a reference to the wireless network node research and design in the electromechanical integration design.