bluuebunny/crossref_metadata_2025 huggingface dataset:
Development of Universal Test Method to Evaluate the Plastic Deformation of Sheet Metal
Authors: Oh Kyung Seok , Oh Kwang Hwan , Jang Jun Ho , Han Kyung Seop
Published: January 2011

Universal test method to evaluate sheet metal formability was developed using finite element method based on axiomatic design. The newly developed formability test intended to generate the various modes of deformation and to control the onset of failure independently under each mode of deformation. The functional requirements (FRs) and the design parameters (DPs) of the test system were defined on axiomatic design approach and decomposed until the design reaches final stage. The independence axiom was applied throughout the design process to maintain the hierarchical independence of the formability test system. The flow diagram representing the system architecture was introduced after decomposition to give a help to establish the systematic design procedures and to determine the design parameters. Numerical simulation was carried out to determine the specific value of DPs which satisfies the FRs. Numerical results showed that modes of deformation varies accompanying various strain paths and good controllability of sheet forming is obtained for different kinds of materials. Experimental work was finally conducted to validate the proposed design. Stamping results represented that the outcome of the deformed geometry and strains are in good agreement with the numerical results.
Study on Parametric Modeling Method for FEA Model of Periodic Symmetric Struts Support
Authors: Li Zhen Shi , Gheni Mamtimin , Yu Lie
Published: January 2011

In this paper, the APDL programming language provided by ANSYS software is used to build the parametric modeling of Periodic Symmetric Struts Support (PSSS), which is provide convenience and necessary preparations for the Finite Element Analysis (FEA) and save much time and effort during the preprocess analysis. At first, the positional parameters and size parameters of PSSS are analyzed, and find out the relationship between main parameters, and identify the parameter equations. Then, build the struts support model and edit the parameter equations by APDL language. Finally, the producing process of different kind of struts support models are implemented by changing main parameters and provide the necessary conditions for preprocess of FEA.
A Real-Time Location and Reset Method of Cylindrical FPSO
Authors: Xu Xiu Long , Xu Zhen Ying , Xu Ran Ran , Jiang Jia Kun , Guo Xiao Dong
Published: January 2011

In this paper, a real-time location and reset method of cylindrical FPSO is presented based on GPS. In this method, the coordinate system of PFSO is determined by three GPS locators installed on the platform. Then, through coordinate transformation according to the marine engineering coordinate system established before, we can get the displacement and the orientation of FPSO, so as to achieve its real-time location. Finally, this displacement and orientation information is assigned to relative thrusters, which are evenly distributed with an angle 22.5°on both sides of the “+” and “-” X and Y axis, according to the calculating results of the optimization model.
Modeling for Subway Station Temperature Control System of Urban Rail Transit Based on Predictive Control
Authors: Tian Yu Dong
Published: January 2011

Urban rail transit is an important research field in the public traffic, and the subway station temperature control influences the performance of subway ventilation greatly. To aim at the problem, firstly the principle, algorithm and characteristics of predictive control method is analyzed; then a subway station temperature control system of urban rail transit and its characteristics are researched; at last, modeling of subway station temperature control system is advanced by applied the generalized predictive control in the view of technology application in order to resolve the control problems caused by time-change, long-hysteresis, uncertainty and strong-coupling to meet the require of temperature control characteristic.
Kinematic Analysis of a Novel Hybrid Chinese Medical Massage Robot
Authors: Xie Jun , Kuang Li Hui , Zhang Yi
Published: January 2011

The kinematics and dynamics characteristics of Chinese medical massage manipulation, such as pressing, kneading, rolling and pushing are studied. Based on the results of this analysis, the serial mechanical arm with six rotational joints and the end actuator with 3-DOF parallel mechanism are selected, and a new type of hybrid massage robot is proposed. The kinematic equation of the robot is set up through the D-H transformation matrix in D-H coordinate system. The direct and inverse kinematic solutions of the mechanical arm are calculated. Through the introduction of the arm-shaped mark, the inverse solution becomes unique. This shows that this mechanical arm can be in good control. The virtual prototype of this mechanical arm is built by Pro/E, and it is input to ADAMS from Mechanical/Pro. The movement simulation of the virtual prototype shows that the kinematic equation of the robot is right and this kind of hybrid massage robot can simulate the massage manipulation with very well smooth movement characteristics.
Dexterity Analysis of 3-RCR Parallel Robot Mechanism
Authors: Chen Hai Zhen , Zou Zhong Yue , Song Hong Peng
Published: January 2011

Based on forward position equations of 3-RCR parallel mechanism, the Jacobian matrixes were obtained. The global condition index was gotten based on the Jacobian matrix. According to the global condition index and the polar coordinates boundary searching method, using MATLAB software, the dexterity atlases of the mechanism were gotten. Finally, the dexterity was analyzed. The research can provide theory foundation for study and application of parallel mechanism in the future.
Development of Universal Multi-Function Digital Remote Control Electronic Switch Based on WSN
Authors: Wang Jun , Zhang Xi Liang , Yuan Jin , Shi Xiao Feng , Gao Xin Ming
Published: January 2011

To improve electrical operational flexibility in use and save energy, a universal multi-function digital remote control electronic switch for variety of household appliances is developed by adopting wireless sensor networks and infrared sensing technology. To NRF9E5 wireless microcontroller as the core, electronic switch that formed by the remote control and a number of switch nodes forms short-distance wireless communications network. Remote control is equipped with clock circuit, buttons and LCD display; switch node with infrared sensor, human body detection circuit, relay and control circuit. Switch can be controlled by remote control, human infrared sensor or setting time. The application shows that it greatly increases operational flexibility with easily integrating with various existing electrical switches and has obvious energy saving effect.
Online Monitoring System for Micro-Hole Drilling Based on Rough Set Fuzzy Control
Authors: Wang He , Li Xue , Ju Qi Ming
Published: January 2011

An online monitoring method for micro-hole drilling based on rough sets fuzzy control is developed in this article to improve system on too many control rule numbers with strong subjectivity and complicated calculations. Utilize rough sets for reduction of fuzzy control rules and fuzzy control system for real time data processing of drilling capacity, drilling moment and spindle motor current under MATLAB platform. By discovering micro-drill bit abrasion information, online monitoring for micro drilling can be implemented in real time which can effectively prevent micro drill bit from crack.
Image Segmentation Based on Improved Adaptive Genetic Algorithm
Authors: Chen Zu Jue , Fu Xian Xiang , Zhou Xiang
Published: January 2011

Using computer vision technology to accurately identify weeds and crops, positioning weed and spraying of weedcide has become a hotspot of precision agriculture. To determine the optimal threshold in image automatic segmentation and solve one-dimensional histogram without obvious peak and valley distribution, image segmentation method based on two-dimensional histogram and Improved Adaptive Genetic Algorithm is proposed. In the method, the genetic algorithm carries on the global optimization to get the threshold rapidly, and the computational method for crossover probability and mutation probability of the Adaptive Genetic Algorithm is improved. The Improved Adaptive Genetic Algorithm can preserve the multifamily of population and the astringency of the algorithm, and can overcome the problems of poor astringency and premature occurrence in Simple Genetic Algorithm. The result shows that the proposed approach greatly enhances the speed of thresholding and has better immunity to Salt and Pepper Noise.
System of Automatic Correction and Measurement for Hypoid Gears
Authors: Li Tian Xing , Deng Xiao Zhong , Gao Zhen Shan , Li Ju Bo
Published: January 2011

The system of automatic correction and deviation measurement of hypoid gears is the basic platform for the digital closed-loop manufacturing technology. Based on the gear measuring center and the numerical controlled gear milling machine, a measurement and correction system is developed by the application of Visual C++ and Fortran. The architecture and the implement of the main modules are elaborated. Experiments and applications indicate that the tooth surface deviation can be effectively reduced by the system of automatic correction and measurement, and the stability of tooth surface precision and manufacturing quality is improved. It would provide the foundation for the digitalization of manufacture and quality control of hypoid gears.
Segmentation of cDNA Microarray Image Using Fuzzy c-Mean Algorithm and Mathematical Morphology
Authors: Li Zhi Yao , Weng Gui Rong
Published: January 2011

cDNA microarray technology provides an effectual tool to explore the enormous genome. cDNA microarray consists of thousands of gene sequences which are printed on glass slide and these sequence information can be obtained by forming a microarray image. So image analysis is crucial. However, image segmentation is another key point. How to deal with the gene spots which are always comprised with imperfection such as irregular contours, donut shapes, artifact and spots with low expression is important to the robustness of the segmentation method. The paper proposed a method based on fuzzy c-mean algorithm which can effectively avoid the influence of various types of artifacts through adaptive partitioning.
Underwater Thrusters Installation for Dynamic Positioning System of Offshore Floating Vessel
Authors: Zhuang Jian Jun , Xu Zhen Ying , Li Bing Nan , Wang Yun , Xu Hao , Zhang Yong Kang
Published: January 2011

Advanced offshore floating structure utilizes dynamic positioning system to guarantee its automatic positioning without mooring system, realizing the offshore positioning requirements. The thruster is the key component of DP whose installation method directly affects the operation of DP and positioning accuracy of offshore floating structure. Based on the analysis of underwater installation methods of the existing large equipment, the paper proposes a new installation method of the large thrusters, using the L-shape floating platform as shift, orientation and position adjustment of thrusters. The new method can complete the precise position matching and installation of thrusters in the bottom of the structure.
Research on Control System for the Automation Process of X-Cor Sandwich Structure Material
Authors: Liu Lin , Lai Chao Liang , Li Yong , Xiao Jun
Published: January 2011

To realize the automation process for Pin implanting of X-cor sandwich structure, a hardware architecture of CNC based on open control system was proposed in which a Programmable Multi-axes Controller (PMAC) was adopted as the key unit for motion control and the accessory card for on-off control. The time based control mode is applied to realize synchronization of motion control and on-off control and to improve the real-time effort of the main tasks that closely related to the Pin implanting process. In addition, the device driver for PMAC, a user graphical interface as well as numerical control program interpretation module were also designed and the whole system is applied to the core material manufacturing process of X-cor sandwich structure.
Application of Intelligent Control in the Servo System
Authors: Xie Jian Ping , Kong Xiao Hong , Zhou Yi , Chen Yan Feng , Mao Xin Hua
Published: January 2011

The pneumatic valves are widely used in the actual industrial production, and their practical performances are very important to the control system. Traditionally, the common PID controller is widely used in the control of the pneumatic valves. Due to the strong nonlinearity of the pneumatic valve, the control effect of the PID method for the pneumatic valve is below what is desired. In order to address this problem, a fuzzy PID control scheme is presented to be used in the pneumatic system in this paper. Simulation results and the practical control effect show that this kind of compound control structure has better performance than the classical PID control method and satisfactory effects have been obtained.
Stability Analysis and Improvement of Virtual Wall Model
Authors: Li Jia Lu , Song Ai Guo , Zhang Xiao Rui
Published: January 2011

Sampled-data system’s nature is the main factor that causes virtual wall to demonstrate active (non-passive) behavior, destroying the illusion of reality. To enhance the stability of haptic rendering by virtual wall model, a novel spring-impulse model based on energy conversation and momentum conversation is proposed. In the model, an impulse in the opposite direction of avatar’s velocity is exerted on avatar at the instant from inner of virtual wall back to balance position during unstable state. This resistant forces eliminate extra work to reduce the non-passive behaviors of the haptic system, which lead to improved realistic rigid perceptions and system stability. The experiments have verified the effectiveness of our spring-impulse method in a virtual stiff-wall prototype system via a Phantom Omni haptic device.
A Continuous Control for Stabilizing the Extended Nonholonomic Double Integrator
Authors: Peng Yan , Liu Mei , Huang Qing Jiu , Xie Shao Rong
Published: January 2011

The extended nonholonomic double integrator (ENDI) cannot be asymptotically stabilized by a continuous and time-invariant feedback controller since it violates the Brockett’s condition. In this paper, a new continuous control scheme is proposed to stabilize the ENDI system without drift. The dynamics of an ENDI system is enlarged to a higher dimensional space where a continuous but time-varying control law is designed for its stabilization. Besides the theoretical proofs, simulations conducted on the dynamics of a mobile robot are also presented to demonstrate the validity and performance of the proposed method.
A New Algorithm for Normal Adjustment of Point Cloud
Authors: Sun Jin Hu , Zhou Lai Shui , Xiang Bo , An Lu Ling
Published: January 2011

In the area of reverse engineering, the normal of point cloud is the basis of data processing such as smoothing, simplifying and fusing. The consistent adjustment of normal orientation (or called normal adjustment in short) is an essential step for normal estimation. In this paper, a new algorithm for normal adjustment is proposed. It mainly researches on how to get the right adjustment effect and how to make it faster. To adjust the normal rightly, the angle between the original normals of two points is used as the basis of spread order. A suitable exploration mode, in which only the border of adjusted points and unadjusted is explored, is chosen to make the adjustment process efficient. To get more efficiency, the spread based on threshold value is used to adjust several points for one time. The spread based on minimum value is also used. The latter mode is not as efficient as the former one, but it ensures that the spread will not suspend. Experiments result indicates that the normal adjustment algorithm is efficient.
Control of Damping Nonlinearity of Semi-Active Suspension
Authors: Wang Shao Hua , Wang Ruo Chen
Published: January 2011

Based on Hopf bifurcation and singularity theory, this paper analyzes the damping nonlinearity of vehicles’ semi-active suspension and reveals the dynamics characteristics of this suspension. Taking the damping nonlinearity into consideration, this paper establishes a fuzzy dynamic model of vehicles’ semi-active suspension and proposes its control strategies. Bench tests are also carried out by means of simulation computation and the results show that the fuzzy dynamic model of vehicles’ semi-active suspension can solve the nonlinear problems and simulation computation is close to experiments. It provides reference for the practical application of vehicles’ semi-active suspension.
Design of Signal Processing System for Doppler Speed Radar Based on SOPC
Authors: Wang Xiao Fei , Li Bo Quan , Pan Hai Bin
Published: January 2011

Doppler speed radar is a high precision velocity measuring instrument based on Doppler Effect, which has widely applications in measuring moving target’s velocity. In this paper, a novel design of Doppler signal processing system was presented to perform projectile’s speed measurement tasks. The system architecture is based on an Altera Cyclone II chip and designed as a System-on-a-Programmable-Chip (SOPC) with the help of an embedded Nios II software processor. And the SOPC system integrates CPU, memory, I/O interface and some other reconfigured modules required in system. According to the proposed scheme, the peripheral circuits were designed in this system, such as signal condition, A/D conversion and auto gain control (AGC) circuit. We also proposed to use spectral analysis method based on windowed FFT to deal with the measured target’s Doppler signal. Further, the signal source of simulating targets was used to testify the system feasibility. In addition, future work can include the further study on frequency estimation algorithms or comparisons of the proposed architecture with traditional design.
Intensity Control of Ultrasonic Phased Array Focusing and Steering
Authors: Zhong Xin , Li Bo Quan , Dai Hao
Published: January 2011

When we detect an object by ultrasonic phased array focusing and steering in Non-Destructive Testing (NDT), the ultrasonic attenuation due to material damping will merge noise in the main signal and make data processing difficult. This paper presents an intensity control method developed to ensure that the intensities of eight subwaves are same when they are focusing or steering to the damage location. The mathematics model was established between eight elements and their corresponding magnification factors. We realized the intensity control function by adding an intensity controller model, which is designed on the basis of FPGA technology, into ultrasonic actuator/sensor. Some validation tests were made by using the development platform of Altera CycloneⅡseries. It was shown that both the precision and speed of the model can meet the requirement.
The Simulation and Fatigue Life Prediction of a Cable Harness in an Industrial Robot
Authors: Zhou Jia Fu , Wu Jie Sheng
Published: January 2011

This paper presents a method to simulate the behavior of the cable harness using the absolute nodal coordinat formulation (ANCF) and to predict the fatigue life while computing the strain time history of the point of interest. Rigid body dynamics is applied for the robot system, while ANCF is used for the cable harness. The simulation is performed by using the dynamic analysis process. The material property of the cable is obtained by a test. A simplified model is prepared. With these data, the behavior of the cable is simulated and the fatigue life is predicted.
A New Air-Conditioning Pipeline Cleaning Robot System
Authors: Li Zhi Xiang , Li Heng Wu , Li Zhi Hui
Published: January 2011

Presently most of the air-conditioning pipeline cleaning robots in the market do not have the self-adaptive capacity to variable diameter pipelines, and clean the circular pipeline incompletely, have the whipping problems in the working process. For this case, this paper developed a new type of pipe robot; the robot adopts the umbrella-like open-and-close mechanism, scissors lifting mechanism and tail location and navigation device. It can align the center of the circular pipes with different diameters automatically, and sweep 360° one-time, improve the efficiency and stability of the robot greatly.
Investigation on the Effect of Thickness to Sheet Metal Treated by Laser Peen Forming
Authors: Huang Shu , Zhou Jian Zhong , Yang X.D. , Ruan Hong Yan , Wei Deng Hui , Fan J.R.
Published: January 2011

After the mechanisms of laser peen forming (LPF) were analyzed, the effect of sheet metal’s thickness on LPF was discussed in theory. The analysis model that residual stresses brought sheet bending was established, and the relationship between thickness and arc height of sheet metal was obtained. The process of laser shock wave loading during LPF was modeled, and then the residual stresses and deformation of the peened sheet were simulated by ABAQUS software. The results indicated that LPF use bending moments caused by residual stress to induce deformation, which was agreed with the theory analysis. The curvature of sheet metal induced by LPF decreased as the thickness increased, the arc height formed by bending was inversely proportional to thickness square of sheet metal on the whole. This research also has significance for the control of LPF and the investigation of further experiment
Calibration Methods of Planar Parallel Robot
Authors: Li Wei Da , Li Juan , Sun Li Ning
Published: January 2011

Kinematic calibration is an effective method of improving robotic absolute position accuracy by means of measurement, identification and compensation etc. This paper investigates the technology of kinematic calibration and error compensation for the 2-DOF planar parallel robot. A multi-step calibration method is presented based on error itterative method and nonlinear optimum method. Experimental results indicate that the proposed method can effectively compensate position error of the robot in Oxy plane, and the absolute position error of the calibrated robot is less than 6μm.
Optimal Design of OPCM Sensor by the Orthotropic Ratio
Authors: Wang Zi Ping , Luo Ying , Sun Wen Bin
Published: January 2011

An improved design principle of Model of 1-1 OPCM sensor elements is proposed from the constitution and mechanics-electric coupled property of OPCM. The orthotropic ratio is defined and the optimal ratio of length to width of Model of 1-1 OPCM sensor is deducted from it. The functional properties of an OPCM sensor designed by the optimal ratio of length to width are simulated with COMSOL. The numerical results are validated by experimental data. Experimental results agree well with the results of numerical simulation.
Design of Grate Bed Heat Recovery Unit and Simulation Analysis
Authors: Zhang Xi Liang , Xu Jun , Chen Li Qiang , Feng Ai Xin
Published: January 2011

For the current problem that grate bed can not recover its own waste heat in the course of cycle working, combined with the structure of the chain grate and hot air flow process, a three-section heat recovery unit of grate bed and waste heat recovery hot air flow process are designed. According to the principle of repeated convective heat transfer, the amount of recovering waste heat of heat recovery unit is estimated, and simulation analysis is conducted by using fluent software. The results show: after three heat exchange between the hot exhaust gas at around 100°C and the grate bed, the hot gas at a temperature of around 427 °C can be obtained, and the waste heat recovery rate is above 60%; simulation results are compared with the estimated value so that it can be obtained that the differences between the two values in the temperature of three-section outlet gas are basically consistent, about 8°C, 4°C, 7°C respectively, which verifies the effectiveness of the heat recovery unit design and the accuracy of Fluent simulation.
Mechanical Behavior Experimental Study of Microstructure under Tensile Loading and Electric Field
Authors: Wang Quan , Hu Ran , Zhang Jin , Jiang Lei Lei
Published: January 2011

The mechanics problems can drastically compromise device performance and reliability. To solve these problems, there is a need to develop a fundamental understanding of mechanical behaviors of microstructures in MEMS. Also the increasing use of small micromechanical devices and advanced sensors has led to concern about the failure modes and reliability of these structures. In this paper a micro sample tension machine is made and using it one kind of micro sample fabricated with micromachining is tested. The tension experiments of the micro sample are done under different current to get the comparing data. The experiments yield reasonable and reproducible data. It is shown apparent plastic deformation of the micro sample happens under tension force. Mechanical behavior of the micro sample is distinguished to that of the sample with macro dimension. Micro size effect can be concluded about the micro sample under tension. Under different currents the elastic modulus and the tensile strength of the micro sample decrease with the current increasing. The relationships between them are gotten through experiment. The reliable designing parameters of the material are gained. The glaring outcome is that the uses of the material are depended highly on processing and fabrication techniques. The fabrication techniques can be developed and make the material both practical and reliable.
Study on the Improvement of Fatigue Crack Growth Performance of 6061-T6 Aluminum Alloy Subject to Laser Shot Peening
Authors: Wang Cheng Dong , Zhou Jian Zhong , Huang Shu , Yang X.D. , Xu Z.C. , Ruan Hong Yan
Published: January 2011

In order to enhance mechanical property and restrain crack growth of 6061-T6 aluminum alloy, laser shot peening (LSP) was employed to induce compressive residual stress and plastic deformation on the surface of metal. The FEA code ABAQUS and MSC. Fatigue were used to simulate crack growth of Compact tension (CT) specimens treated by LSP. The numerical simulation results showed that LSP can effectively inhibit the crack growth, decrease the crack growth rate as well as increase the final crack size, and as a consequence, fatigue life was extended. Adding peening times could get deeper compressive residual stress field which strengthen material surface and restrain crack growth, but the fatigue stress intensity factor threshold decreases.
Preparation of Nafion/SiO2 Composite Membrane of Direct Ethanol Fuel Cell
Authors: Ni Hong Jun , Lv Can Can , Zhang Cheng Jin , Liao Ping
Published: January 2011

Membranes are made by doping and modifying the Nafion117 with Nano-silica(SiO2). The penetration and the proton conductivity of composite membrane are studied through gas chromatograph and electrochemical workstation. With the help of cross-section spectrum, it shows that the SiO2 particles can penetrate the internal membrane and the weight percentage is greater than 0.1% after doping and modifying the membranes of Nafion117, so the SiO2 particles has a very good combination with the substrate. The membrane which is handled by Sol on 60°C has high proton conductivity and high water retention performance in high temperature. The permeability coefficient of membrane which is handled by Sol on 60°C and by the other ways are 4.07×10-4cm2/s and 8.13×10-4 cm2/s respectively. It shows that the permeability coefficient of ethanol membrane is reduced by half after the Nafion117 membrane is handled by Sol on 60°C.
The Development and the Present Status of the Flat-Topped Beam
Authors: Wu Zhong , Zhang Yong Kang , Ye Yun Xia , Guan Hai Bing
Published: January 2011

As rapid advance in the laser and the laser technology, more and more lasers have been used in different application fields, which have different demands to the energy distribution of the laser spot. Flat-topped light beam is a type of beam with uniform radiance, so it has been widely applied in all kinds of field such as the material processing. The current research on the flat-topped beam mainly focused on how to obtain the beam and its propagation properties. In this paper, four experimental methods on how to obtain the flat-topped beam are summarized, among of which the beam shaping is emphatically introduced, and their advantages and disadvantages are analyzed. Then, four mathematical and physical models are represented and their field distributions expression and the characteristics are analyzed. The research on the partially coherent flat-topped beam is presented, and its propagation properties are compared with the coherent beam. Last, the applied prospects and the research directions on the flat-topped beam are forecasted.
Study on Magnetoelectric Effect in Amorphous Ribbon /PZT Laminate Materials
Authors: Bao Bing Hao , Tian Xing Cheng
Published: January 2011

Magnetoelectric(ME) effect in magnetoelectric laminate materials have potential application in many fields. In this paper, Fe78Si9B13 amorphous ribbons /PZT/amorphous ribbons sandwich structure laminate materials were fabricated. By theoretical analysis and experimental verification, we studied systemically on the characteristics of the magnetoelecric laminate materials, such as optimized bias magnetic field of the ME effect, ME voltage coefficient at low frequency and the resonant frequency of the magnetoelecric laminate element. ME effect can be used to develop new ac magnetic sensor and other devices.
Pose Normalization Based on Rotation Transformation
Authors: Yuan Hao , Pang M.Y. , Lu Zhang Ping
Published: January 2011

In this paper, we propose an algorithm to calculate pose normalization for 3D mesh models based on an analysis about rotation transformation in the theory of analytic geometry. The method first evaluates an angle and an axis for rotation transformation of each triangle in model. Then, optimal rotating axis and angle are calculated by using probability theory for the whole model and a global rotation matrix is consequently constructed. Finally global rotation transformation defined by the matrix can be obtained and used to transform the model to normalized pose. The experimental results show that our algorithm can calculate pose estimations of models efficiently and automatically.
Design of a New System for Testing the Resistance of Keys of Keyboard
Authors: Yin Su Min , Zhou Qing , Gao Rui Qiang , Zhang Ping
Published: January 2011

A new system for testing the resistance of keys of keyboard was designed based on the embedded motion controller. Hardware design and software design of the system were accomplished. According to the system requirements, the embedded controller (GUC-400-EPV-ML-M01-L2) was chosen as the control center of the hardware system. The implement of system software was based on Visual C++ 6.0 programming platform by using C++ language. The qualified boundary values about the resistance of keys can be adjusted by means of keyboard input. Collecting data, processing data and statistics of data automatically were achieved. Examining results can be displayed through the human machine interface which was designed on the windows platform based on VC++ 6.0. The whole testing system is proved to satisfy the desire of industrial manufacture, which is excellent in the reliability and the anti-interference ability. It has a promising market prospect and really deserves to be spread.
Design of Soft Start Energy-Saving Control System for the Motors in Pumps
Authors: Sheng Zhan Shi , Zhang Rong Chuang , Wang Guo Jun , Huang Hu , Guan Jia Jun
Published: January 2011

In order to solve the problems of the high energy cost of the pump and the low efficiency of the motor, we developed a voltage regulator control system with an advanced LPC2368 chipset. By changing the motor voltage, the system ensures the motor work in a mode that the voltage of the free or light load is lower than the rated voltage. In this mode, the system ultimately saves energy. The simulation results indicated that the system not only can avoid the impact of instantaneous current and reduce the energy consumption, but also can save energy effectively
Soft Sensor Modeling of Biological Fermentation Process Based on tPSO-FNN
Authors: Huang Li , Sun Yu Kun , Ji Xiao Fu , Huang Yong Hong , Du Tian Yan
Published: January 2011

Biological fermentation process is a complex nonlinear dynamic coupling process. As it is very difficult to measure the key biological parameters on line, the process control is unavailable to industrial production in time. In this respect, however, soft sensing can solve the above problem. To overcome some drawbacks of PSO and FNN, such as falling into local minimum occasionally and slow convergence speed, the extremum disturbed particle swarm optimization (tPSO) algorithm is proposed and then combined with fuzzy neural network (FNN) to optimize the network parameters. Furthermore, the tPSO-FNN is applied in the soft sensor modeling of lysine biological fermentation. Experiment results show that the model proposed could measure the key parameters. And the soft sensor model based on tPSO-FNN has higher precision and better performance than the model based on FNN.
Research on the Surface Roughness of Dry Cutting Different Levels of Austempering Ductile Iron (ADI)
Authors: Xue Xiao Hong , Guo Xu Hong , Chen Ting Ting , Wan Dong Dong , Wang Qiao
Published: January 2011

Three cutting tools of different materials (ceramics CC6050, cubic boron nitride CB7025, carbide GC2025) are used for dry turning of 9 groups of ADI which heat-treated under different quenching time and quenching temperature. The surface roughness of ADI workpieces were tested after the finish turning at changed cutting parameters, and the influencing factors of surface quality were analysed. Results showed that the surface roughness values of all 9 groups of ADI workpieces obtained by CC6050 were the lowest and the surface quality was better at lower depth of cut ap and feed rate f with higher cutting speed vc . Meanwhile, the surface roughness was influenced by the isothermal quenching parameters of ADI workpieces significantly.
Finger Milling-Cutter NC Generating Spiral Bevel Gear Tooth Surfaces & its Machining Simulation
Authors: Li Geng Geng , Deng Xiao Zhong , Wei Bing Yang
Published: January 2011

Based on the in-depth study the principle of NC generating gear tooth surfaces by application of the disc milling-cutter, finger milling-cutter NC generating spiral bevel gear tooth surfaces is presented in this paper. Through using a 5 shaft 4 linkage machining center, the finger milling-cutter is mounted on the imagination disc milling-cutter, in fact, 2 NC axes are used simultaneously to control the finger milling-cutter motion, imitating a blade motion of disc milling-cutter, and the motion of the blank is not change, to generate the spiral bevel gear tooth surfaces. A spiral bevel pinion is simulation machined by using machining simulation system VERICUT and the feasibility of the machining method is verified.
Experiment Study on Nd: YAG Pulsed Laser Cutting Carbon Fibers Composites
Authors: Ge Tao , Zhang Yong Kang , Chu Xiao Meng
Published: January 2011

Nd:YAG pulsed laser cutting carbon fibers reinforced epoxy resins composites was studied. HAZ and kerf width was made as evaluation index, as well as laser pulse energy, cutting speed, pulse duration and assistant gas pressure was made as controlled parameters. Ideal quality of cutting can be achieved by adjusting those parameters. The effect of each parameter was analyzed.
Numerical Analysis the Tibological Performance of a Laser Surface Textured Mechanical Seal
Authors: Fu Yong Hong , Ji Jing Hu , Hua Xi Jun , Bi Qin Sheng
Published: January 2011

This paper presents a numerical study of the effects of surface structure geometrical parameters on the tribological performance of a laser surface textured mechanical seal. Seal performance such as seal clearance which is corresponding to hydrodynamic effect and friction torque is calculated for a range of sealed pressures, dimples area density and dimple depth over dimple diameter ratio. The results indicated that laser surface textured mechanical seals substantially improve the tribological performance in the lower sealed pressure than in high pressure. Area density of dimples has little effect on the tribological performance, however, dimple depth over dimple diameter ratio has significant effect on the tribological performance.
The Software Development of Double-Beam Centroid Distance Measurement System in Laser Cladding Forming Process
Authors: Sun Cheng Feng , Shi Shi Hong , Fu Ge Yan , Li Chun Sheng
Published: January 2011

In the high-piled up process of laser cladding rapid forming , the distance between aser molten pool center and flour will increase along with the cladding layer ,which will cause the effect of light powder coupling getting worse, even directly lead to failure. The article proposed characteristics of the double-spot ,formed by molten pool and reflection of laser surface;used VC++ 6.0 as the development platform of image processing to calculate two spot centroid distance by dealing two spot image with the process of gray processing, Gaussian smoothing, binary threshold segmentation, area centroid calculation, the centroid coordinate distance calculation.At the same time , controlling laser head Z to move in accordance with the value increment,to increase the stability of forming process and forming quality.
The Failure Investigations on the Thin Film Interface under the Dynamic Loading
Authors: Wang He Jun , Liu Hui Xia , Shen Zong Bao , Li Wei , Zheng Yuan Yuan , Wang Xiao
Published: January 2011

The film spallation, a typical film / substrate failure style, could be caused by many reasons. The strong impact on the film/substrate can also lead to this failure phenomenon. So the film spallation induced by the strong impact is explored in this paper. Here the strong impact comes from the laser-driven flyer loading. In the numerical simulating process, the Finite Element Method (FEM) and Johnson-Cook material constitutive model have been used, moreover, some ideal film spallation results were got, which are helpful for us to understand this failure phenomenon.
Research on Constructing Surrogate Model of Coronary Stent Mechanical Property
Authors: Shen Xiang
Published: January 2011

Coronary stents are small tube-like structures expanded into stenotic arteries to restore blood flow perfusion to the downstream tissues. In this paper, based on the finite element analysis (FEA), both the response surface model (RSM) and radial basis function neural network (RBFNN) are used to construct the surrogate model for stent recoil performance. Precision between these two surrogate models are compared. The results show that the surrogate model with RBFNN is more reliable and efficient.
Research on 3D Reconstruction System for Medical Images
Authors: Zhang Yong , Ni Jun Fang , Liu Peng
Published: January 2011

In accordance with the object-oriented programming, a system for 3D medical images of reconstruction and display has been designed and implemented. The overall software structure is established based on VC++6.0 and display technique of Open Graphics Library. The functional modules, such as acquisition of encoded 3D data, pre-process, reconstruction and display, are achieved by the design and implementation of customized classes. At last the software system provides user-friendly graphical user interfaces, highly efficient data processing and reconstruction, and rapid capability of graphic display.
Study the Effect of Synchronized Force on Combination Frame Structure of Large Forging Press
Authors: Wang Fang Fang , Zhan Li Hua , Huang Ming Hui , Wang Ya Jun , Liu Ming
Published: January 2011

In view of the work conditions of eccentric loading in large forging presses, a set of synchronized deviation-rectifying system is necessary. Theoretical analysis and calculation of the synchronized balance force (rectified force) were computed based on static stress analysis theory, and then input into the commercial software MARC to build finite element model for combination frame structure of large forging press, the influence of synchronized force on the stiffness and stress distribution of combination frame structure (C type plates) were studied. Comparison among simulation results under different work conditions and also with experimental results was carried out, which testified the correctness of modeled rectified force equations and the finite element analysis system, and also showed the importance of the synchronization balanced system. The disquisitive work has certain significance for designing the large presses or other type presses with this type of combination structure.
Theoretical Calculation and Numerical Analysis of Residual Stress in Laser Peen Forming of Metal Plate
Authors: Zhou Jian Zhong , Huang Shu , Sheng J. , Fan J.R. , Xu Z.C.
Published: January 2011

Laser peen forming is an emerging novel process of metal plate bending, which uses laser-induced shock wave pressure to generate an unbalanced residual stress field in the target, the moment of the residual stress causes metal plate to develop plastic bending deformation. The mechanism of laser shock induced residual stress was introduced firstly, then the deforming process of metal plate induced by residual stresses was discussed and the depth of the residual compressive stress was proposed. Effects of processing parameters on the residual stress distribution and plate bending deformation were numerical analyzed. The results indicated that the bending deformation of sheet was relative to laser peening numbers, peening coverage and thickness of plate, the magnitude and distribution of residual stresses could be precisely controlled by adjusting laser processing parameters.
2D CFD Analysis of Micro Arc-Groove on the Surface of Tribopairs
Authors: Zhang Pei Yun , Zhang Yan Hu , Hua Xi Jun , Liu X.K. , Yin Bi Feng , Fu Yong Hong
Published: January 2011

The objective of the literature is to investigate the influence of micro-arc grooves on the surfaces of the sliding tribopairs by plain pads to hydrodynamic lubrication. This is accomplished by the CFD-approach (computational fluid dynamic approach) where the momentum and continuity equations are solved separately, laminar model and SIMPLE algorithm in theory of Control Volume Method are adopted, and the rheology is assumed to be Newtonian. For various widths and depths of micro arc-grooves, the load supporting capacity of oil-film is calculated in the form of a net total force and static pressure, the friction is compared by the stress of smooth wall, and the dynamical pressure of the upper walls is shown. It will be found that width has more influences than depths to hydrodynamic lubrication, and relative parameters change monotonously with the depth of arc groove. Moreover, given primary film thickness as 6μm, within physically reasonable range of the parameters (depth and width of groove), i.e. in addition to w=40μm, hp=5μm~15μm, the effect of texturing arc-grooves on improvement of tribological properties will be conspicuous.
Mechanical Effects during Pulsed Laser and Metals Interaction in Neutral Solution
Authors: Zhang Hua , Xu Jia Wen , Zhao Jian She , Hua Guo Ran
Published: January 2011

In order to investigate the mechanical effects during pulsed laser and metal target in neutral solution, a measuring part of stainless cantilever was developed. The vibration of the stainless cantilever was tested and analyzed based on the test mechanism of piezoelectric accelerometer. The impact pressure of the target in NaNO3 solution by pulsed lasers at wavelength of 532nm and 1064nm with millisecond pulse duration were obtained by the test with the measuring part. The results show that mechanical effect during pulsed laser and stainless target interaction in neutral solution is more than three times higher than in air. The pressure of the target with infrared laser is decreased with the distance of laser propagation in neutral solution. However, the effect with green laser is stable in the laser transmission range of 20mm. The green laser is more suitable for processing under neutral solution.
Nanoindentation and Friction/Wear Behaviors of a Magnetron Sputtered Cnx/Sic Films on Magnesium Alloy
Authors: Mo J.P. , Cheng Xiao Nong , Xu Xiao Jing , Xia Deng Fu , Hao Xin Ni
Published: January 2011

The interface adhesion, nano-indentation and friction/wear properties of the CNx films in CNx/SiC (carbon nitride/silicon carbon) double layer films (SiC as interlayer) deposited on Mg alloy (AZ91D) substrate by using magnetron sputtering technique at room temperature were investigated. The results show that the interface between CNx film and SiC film and the interface between SiC film and Mg substrate both showed obvious and gradual element diffusions as well as high adhesion. The CNx films exhibited low nano-hardness (3.85 GPa) and Young's modulus (30.46 GPa) but high hardness-to-modulus ratio (0.126). As sliding against Si3N4 (silicon nitride) ball (4 mm in diameter) using ball-on-disc friction and wear tester under dry sliding condition at 200g load, the CNx films exhibited the friction coefficient of about 0.20 and the special wear rate in the order of magnitude of 10−6 mm3 m−1 N−1 without film cracking and interface delaminating.
Architecture for 3D Scanning Based Automatic Spraying Machine
Authors: Zhou Zi Qiang , Yu Jing Hu
Published: January 2011

Nowadays, the generally used automatic spraying machines are only suitable for mass products or components. The usage for multi-type and small-batch products is much limited for its time and labor consuming off-line programming. So this paper present a 3D scanning based 4-axies driving automatic spraying machine to overcome the bottle-neck of programming. By the laser installed under the horizontal slid table of the machine a linear structured light is projected on the surface of the work piece. Besides, two cameras are also symmetrically installed on the side of the laser to acquire the image. The real-time images of the camera are acquired into the computer by the image acquisition board. And then a program will process the images and output the featured point of the work pieces. According to these points, a specially designed algorithm based on the spraying principle will find out the trajectory of the spraying gun. Finally, through the PCI based motion control board, the controlling pulses are sending to the controller of the stepper motor. Then the spraying gun can move along the trajectory to painting the work piece.
Numerical Simulation Optimization and Preparation of Cu/ZrW2O8 Functionally Graded Films
Authors: Li Jun , Yan Xue , Xu C. , Zhang L. , Li M.W. , Cheng Xiao Nong
Published: January 2011

A mathematical model for the Cu/ZrW2O8 functionally graded films was established using a finite element method. The effects of the parameters, such as the layer number (N) and composition distribution index (P), on the thermal stress fields of the Cu/ZrW2O8 functional graded films were discussed. It shows that when N=5 and P=2, the maximum thermal stress in the functional graded films is decreased. And the maximum value of thermal stress appears in the internal layers of the functionally graded films. The phase composition, the surface morphology and the thermal stress of the films were analyzed by the XRD, SEM and X-ray stress tester, respectively. The results show that the thermal stress distribution is similar to that from the numerical calculation. The maximum value of the thermal stress decreases to 72% of the original coating without the functionally graded films, and appears in the internal layers of the functionally graded films.