bluuebunny/crossref_metadata_2025 huggingface dataset:
Cutting Performance of Carbon Fiber Reinforced Plastics Using PCD Tool
Authors: Wang Yong Guo , Yan Xiang Ping , Chen X.G. , Sun Chang Yu , Liu G.
Published: March 2011

Carbon fiber reinforced plastics (CFRP) has been widely used in airplanes, spaceships and automobiles. The cutting performance of CFRP with a fiber orientation of 0/45°/90°/135° has been studied at different cutting parameters by using PCD tools. Experiences subjected to orthogonal cutting were performed to investigate the effects of cutting parameters on cutting force, surface finish criteria (delamination) and roughness. Results show that CFRP can be milled by high speed and can get good surface quality with low delamination by using PCD tool. The cutting force decreases under the condition of decreasing the cutting width as well as the feed per tooth and raising the cutting velocity. The cutting force is a key point to control delamination that it should below 200N to get comfortable result. As for roughness, when the cutting force below 250N, the more cutting force, the higher surface roughness, and the trend changes when cutting force over 250N. The relation between cutting force and delamination, cutting force and roughness are obtained respectively through multiple regression analysis.
Research of Mine Hoist Distributed Collaborative CAE System
Authors: Duan L. , Wang Xue Wen , Yang Zhao Jian
Published: March 2011

Based on ASP.NET, Visual Basic .NET and ANSYS APDL command, a mine hoist spindle distributed collaborative CAE services system was established which can provide mine hoist spindle remote parametric structural design and CAE services, realized the product-level mine hoist spindle collaborative CAE function basically.
Research and Implementation of Design Reuse Based on Variant Design
Authors: Qin Hui Bin , Lv Ming , Wang Zong Yan , Wu Shu Fang
Published: March 2011

Rapid product development relies heavily on quick and reliable design reuse. This paper analyzed the current design reuse research in mechanical product, pointed out the exiting drawbacks. It first presented the design reuse technology framework based on variant design for mechanical product. According to the characteristic of metal structure in crane, the four levels design reuse technology that plays a vital role in three dimensional variant design reuse including feature, component, assembly, and product was proposed. Design documents reuse including product design calculation and analysis report, 3D model, engineering drawing, Bill of material, process information gather table was also issued. A product design reuse platform has been developed based on crane design cases. The application system has validated the feasibility and practicability. It is able to shorten the time three times for achieving the 3D product model and engineering drawing, which has been carried out successfully in four crane manufacturing Company.
Based on Pro/E Construction Method of Spiral Bevel Gear Logarithm
Authors: Liu Z.Q. , Zhang Mian Hao
Published: March 2011

For a new type of bevel gear named as logarithmic spiral bevel gear, establish its tooth direction curves and the mathematical model of tooth surface equation. With CAD software platform which can intuitive understanding of complex curves and combined with conical logarithmic spiral parameter equation build the logarithmic spiral on cone surface. Then array logarithmic spiral to make them evenly distributed in the cone surface, without any interference and to meet the strength distribution on both ends of circular truncated cone equally. Use two logarithmic spirals from different starpoint as tooth direction curves of lift and right tooth surface. Finally, use space geometric knowledge to build tooth surface equation by tooth direction curves and tooth profile curves.
Computer Aided Formula Design of PVA Abrasive Tool by Polynomial Regression
Authors: Zhou Zhao Zhong , Li Zhen , Yuan J.L.
Published: March 2011

This paper mainly introduced the method of formulae design for the grinding wheel with micro-crystal corundum. The regressive method included mathematics model, experimental way and steps. Meanwhile, the manufacturing technique of PVA grinding wheel was introduced. According to the result of experimental we figured out the regressive equations about the percent contents of binder, water, formaldehyde, hydrochloric acid，vesicant with nominal hardness degree. This is a value that calculated from the hole-scale into a continuous value by a mathematics expression. Then using the regressive equations we can figured out the series formulae of PVA abrasives with common hardness.
Analysis on the Contact Pressure Distribution of Chemical Mechanical Polishing by the Bionic Polishing Pad with Phyllotactic Pattern
Authors: Lv Y.S. , Li Nan , Wang Jun , Zhang Tian , Duan Min , Xing Xue Ling
Published: March 2011

In order to make the contact pressure distribution of polishing wafer surface more uniform during chemical mechanical polishing (CMP), a kind of the bionic polishing pad with sunflower seed pattern has been designed based on phyllotaxis theory, and the contact model and boundary condition of CMP have been established. Using finite element analysis, the contact pressure distributions between the polishing pad and wafer have been obtained when polishing silicon wafer and the effects of the phyllotactic parameter of polishing pad on the contact pressure distribution are found. The results show that the uniformity of the contact pressure distribution can be improved and the singularity of the contact pressure in the boundary edge of polished wafer can be decreased when the reasonable phyllotactic parameters are selected.
Engine Crankshaft Remanufacturing Life Prediction and Experimental Verification
Authors: Zhang Guo Qing , Lin Hai Bo
Published: March 2011

In this paper, the engine crankshaft remanufacturing life was estimated before and after. As long as the known material properties, loading, local stress, and then select the appropriate fatigue damage model can predict the fatigue life estimation. Material parameters of the experiment and the approximate method are obtained; load is on the basis of dynamic simulation; local stress obtained by finite element analysis; injury models were selected: the uniaxial damage model S-N method and multi-axis model of damage is strain method, SWT-Bannantine method, shear strain method, Fatemi-Socie method. New crankshaft and 500 hours, 1000 hours and 3000 hours after the crankshaft bench fatigue tests were conducted, and the experimental results were compared to verify the correctness of the theoretical calculation, and explain the crankshaft to remanufacture the fatigue life is sufficient.
Numerical Simulation Analysis of Vibrating Screen’s Structure Vibration Property
Authors: Shen Y.X. , Zhang Ke Hua , Chen Y.C. , Zhu H.W. , Fei K.
Published: March 2011

Vibrating screen sifts materials via screen mesh, vibration displacement and velocity. In order to completing optimal design of vibrating screen’s vibration frequency. Firstly, Using the CAD function of the three dimensional software UG NX 6.0 to achieve vibrating screen modeling. Secondly, modal simulation analysis was carried out using the simulation soft NX NASTRAN. Numerical simulation experimental result indicates: this designed vibrating screen’s natural vibration frequency are 27.79Hz, 32.58 Hz, and 46.39Hz, consequently, designing this vibrating screen should avoid identical or approaching these natural vibration frequencies as far as possible, while choosing the vibration frequency.
Multilevel Optimization Evaluation of Hardware Product Quality Based on Extension Correlation Analysis
Authors: Zhao Y.W , Hong H.H. , Chen J. , Su N.
Published: March 2011

In order to evaluate the quality of hardware products comprehensively and objectively, an evaluation model of extension multilevel optimization about hardware products has been established. The model was based on analyzing the quality management of hardware enterprises and took the hardware valve as an example. The solving process firstly used scale index and the first evaluation in restricting and reducing the scope of evaluation so as to improve solving efficiency. Then the values of correlation function, correlation degree, standard correlation degree and the optimization were calculated. Finally the comprehensive evaluation results could be got objectively through comparative analyzing these values. The results indicated that higher degree of satisfaction program would be obtained by applying the multilevel optimization evaluation method of product. And the products quality largely depended on its production stage. Thereby it aided the production managers to do the right choice.
Research on a Model of Order Allocation for Virtual Enterprises
Authors: Wang Hong Fei
Published: March 2011

Industrial clusters can be found very often in the world, particularly in many developing countries. To build virtual enterprise based on an industrial cluster is one of the most important ways to improve the agility and competitiveness of manufacturing enterprises in the cluster. One of the key factors towards the success of virtual enterprises is the correct selection of cooperative partners in the virtual enterprise. An approach of order allocation and partner selection in the environment of industrial clusters is proposed. This approach is composed of two stages: task-resource matching and quantitative evaluation. In the first stage the potential candidates are identified and in the second stage evolutionary programming is applied to deal with partner selection and order allocation problem. The target function, in which the load rate of candidate enterprise is taken as the main variable, is developed, and a simplified example is used to verify the feasibility of the proposed approach. The result suggests that the proposed model and the algorithm obtain satisfactory solutions.
Experimental Study on the Precision Lapping of Sapphire Substrate
Authors: Wang Xiao , Lu Cong Da , Wen Dong Hui
Published: March 2011

Experimental research on the surface quality parameters such as roughness and removal rate in the precision lapping of sapphire was promoted in this paper, effects of processing parameters as load, speed of rotation, grain size and density on sapphire surface quality was studied by experiments. Results showed that lapping load and rotate speed were the most important factors on the removal rate, grain size played a key role in the removal rate and roughness under the same conditions, profile tolerance of surface shape depends on the flatness.
Numerical Simulation of Cold-Rolled Al1100 in CWR
Authors: Xu Hong Ping , Lu J.F. , Ying Fu Qiang
Published: March 2011

Finite element numerical simulation, Cold-rolled AL1100, Cross wedge rolling Abstract. The geometrical and physical models of a ladder shaft for finite element numerical simulation are developed. With the ANSYS/LS-DYNA software, the knifing zone, forming zone and sizing zone of the cold-rolled AL1100 ladder shaft are simulated, including the flow of the material and the strain condition in the whole rolling process. Distribution of tangential strain , radial strain , axial strain , and equivalent strain is analyzed. The influences of wedge corner , stretch corner and reduction of area on the strain and rolling force are discussed. The study is helpful to reveal the law of metal flow inside the rolled part and guide the production of cold Cross Wedge Rolling (CWR).
Research on Stacker’s Variant Design Based on Gene Model
Authors: Wang Zong Yan , Wu Shu Fang , Qin Hui Bin , Xiao L.M.
Published: March 2011

Related models of mechanical products design are investigated through exploring the relevant biological inheritance laws. Drawing on the principle of bio-genetic engineering and bio-growth mechanism, genetic controlling mechanism of products is discussed and applied to the variant design of stackers so as to develop stackers’ variant design prototype system based on genetic engineering and strive to realize the diversification and innovation of product design. With the research subject of lower horizontal beam, product model based on gene model is constructed and its variant process is verified.
Research of Holographic Assembly Technology for Overhead Traveling Crane’s Bridge Based on the Holographic Model
Authors: Wang X.W. , Wu S.F. , Qin H.B. , Wang Z.Y.
Published: March 2011

According to the crane’s bridge structure assembly characteristics, taking advantages of 3D CAD software about “top-down” parameterization model design, importing the concept of product holograph assembly, all-purpose distortional module was established. Adaptive architecture based on holographic assembling and knowledge reuse was constituted ,through renewing and reusing the distinct assembly module knowledge, which used “Layout Sketch “controlling the assembly parameter and adopted the constraint relation of holographic model realized the product design alteration. The results show that the technology has satisfied the needs for assembly knowledge reuse of the products variant design, to greatly enhance product knowledge inheritance.
Implementation and Application of Involute Profile Track Processing in General CNC System
Authors: Yu Ying Liang , Niu S.X. , Yang De Qing
Published: March 2011

Numerical control milling machine with a special transformation can be achieved the involute path processing functions. By using Fan method to process a way to synthesize involute track requirements and involute contour processing. This method is particularly suitable for gear modulus m ≥ 12 ~ 40 of the big modulus gear machining, and omit the big modulus gear-specific complex tool manufacturing. Another advantage is that as the basic parameters of the coordinates programming trajectory calculation as a way to carry out involute trajectories run control, gears accuracy can be effective control and assurance. Furthermore, it can be revised and the edge of the involute tooth surface in the tangential connection.
Autonomous Control of Abrasive Flow Precision Machining
Authors: Xu J.L. , Ji Shi Ming , Fang Z.P.
Published: March 2011

Autonomous nodes distribution, including their relations, real time quality and network communication in abrasive flow precision machining (AFPM) was studied. Autonomous nodes are arranged according to their function. Control program of motor speed is copied into liquid level nodes, pressure nodes, temperature nodes, flux nodes and input/output nodes. If nodes failure has happened, competition algorithm is enabled automatically to select a new node to run important program. Reliability of autonomous control system can be calculated utilizing the formula derived from probability theory. ARM 9 embedded systems with 32 bit CPU and real time embedded operating system are adopted to realize real time quality and reliability of nodes which run independently. CAN field bus and message type flag are used in network communication structure to ensure the real time quality and reliability of nodes connection. Results reveal that using autonomous decentralized control in AFPM possesses not only the characteristic of real time quality, but also the online fault tolerance, which can ensure that system runs continuously even if some nodes break down. The method can avoid system destruction and improve whole system reliability.
Cause Analysis of General Overturn of Port Fixed Crane
Authors: Chen G.Q. , Qin Xue Mei
Published: March 2011

According to serious accident of general overturn and machine damage that happens while an enterprise steel wharf’s port fixed crane with a rated capacity of 10 t was hoisting load. Checking the safety device and safety structure of key part of the accident crane, and the adaptability of maximum amplitude rated capacity and other cause of the accident, finally put forward safety measure of integrated management of cranes.
Methods of Evaluation the Uniformity in the Lapping Process
Authors: Zhang J. , Wang Wei Fang , Wen Dong Hui
Published: March 2011

This paper reviews three methods used to evaluate the uniformity in the lapping process. The first one evaluates the uniformity in lapping process according to studying the uniformity of lapping trajectory. The second one, compared with the measurement pattern based on polar coordinate, explains the advantages of Cartesian -based coordinate pattern in evaluating the lapping uniformity. The last one develops a model to calculate material removal in the lapping process and indicates the uniformity by calculating the material removal. These methods evaluate the uniformity in lapping process from different views, respectively, but each method still has various drawbacks. Therefore, further researches must be carried out to improve the system used to evaluate the uniformity in the lapping process.
Numerical Simulation for Temperature Field of ZK60 Magnesium Alloy Sheet Butt-Welded in GTAW Hybrid a Longitudinal Electromagnetic Field
Authors: Luo Jian , Wang X.M. , Li Fei , Luo Quan Xiang
Published: March 2011

The ZK60 magnesium alloy sheet butt-welded in gas tungsten arc welding with different heat input are analyzed and simulated. A double-ellipsoid heat source and the temperature-dependent thermo-physical properties of ZK60 magnesium alloy sheet are employed for performing a non-linear transient thermal analysis by a finite element method. The effect of heat input on welding seam geometry has been studied. As a calculated result, the welding voltage, welding speed and the welding current are the main factors to determine the welding seam geometry. The different welding temperature fields between the general gas tungsten arc welding (GTAW) and GTAW hybrid a longitudinal electromagnetic field (LMF-GTAW) have been achieved.
An Ontology Approach for Manufacturing Enterprise Data Warehouses Development
Authors: Xu B.Y. , Cai H.M. , Xie C.
Published: March 2011

Data warehouse (DW) is a powerful and useful technology for decision making in manufacturing enterprises. Because that the operational data often comes from distributed units for manufacturing enterprises, there exits an urgent need to study on the methods of integrating heterogonous data in data warehouse. In This paper, an ontology approach is proposed to eliminate data source heterogeneity. The approach is based on the exploitation of the application of domain ontology methods in data warehouse design, representing the semantic meanings of the data by ontology at database level and pushing the data as data resources to manufacturing units at data warehouse access level. The foundation of our approach is a meta-data model which consists of data, concept, ontology and resource repositories. The model is used in a shipbuilding enterprise data warehouse development project. The result shows that with the guide of the meta-data model, our ontology approach could eliminate the data heterogeneity.
Dynamic Analysis of a High-Speed Grinding Spindle
Authors: Pang Jing Zhu , Li Bei Zhi , Yang Jian Guo , Wu Zhou Ping
Published: March 2011

This paper presents the effects of spindle system configuration on the dynamic and static characteristics of high speed grinding. A 3D physical mode of high-speed grinding motorized spindle system with rotation speed of 150m/s was provided. The motorized spindle system consists of bearings, rotor, stator, spindle housing and grinding wheel. Based on the finite element method (FEM), the static characteristics, dynamic and the transient response are analyzed based on the finite element analysis software NASTRAN. It is shown that the spindle overhanging, bearing span have a significant effort on spindle deflection. The dynamic analysis shows no resonance will happen during its speed range. The methods and solutions for the motorized spindle system design and engineering applications was given in this paper.
Analysis of Cutting Forces in Helical Milling Process
Authors: Wang H.Y. , Qin Xu Da , Wang Qi
Published: March 2011

Helical milling is used to generate holes, in which a tool attached to the rotating spindle traverses a helical trajectory, and the diameter of holes will be larger than that of the tool. Based on the principle of helical milling, this paper establishes analytical model of cutting forces. As the cutter travels on the helical path, intersection between the tool and the workpiece changes continuously, in which chip thickness and direction of the cutting forces will vary simultaneously. The cutting forces are not only direct proportional to the axial depth of cut, but also related to the rotational speed and orbital speed of the tool. Cutting experiment is conducted for the titanium alloy. The result shows that the simulated cutting force can be used to predict the change of cutting force under different conditions.
Study on the Radial Vibration of an Annular Plate Ultrasonic Concentrator with Edge Section
Authors: Xu H. , Liu S.Q.
Published: March 2011

The radial vibration of an annular ultrasonic concentrator with edge section is studied. Based on the electromechanical analogy, the radial equivalent circuit and the frequency equation of the concentrator are derived, the radial displacement amplitude magnification and the nodal circle equation are given. The relationship between the radial displacement amplitude magnification and radius ratio of the annular vibrator at the first and second order vibration mode is obtained. The relationship between the first and the second order radial resonance frequencies and the radius ratio of the annular edge section concentrator is analyzed. The displacement amplitude magnification of the annular vibrator at the second order resonance is lager than that of the first order vibration mode. Especially, when the radius ratio tends to one, the second order resonance frequency of the annular vibrator tends toward infinity. It can be concluded that there is no higher order vibration mode for a thin-walled circular ring. Furthermore, the experimental results show that the theoretical resonance frequencies and the amplitude magnification are in good agreement with the measured results.
An Improved Genetic Algorithm Based on hJ1 Subdivision and Fixed Point
Authors: Zhang Jing Jun , Wang Hong Xia , Cao Li Ya , Gao Rui Zhen
Published: March 2011

An improved genetic algorithm based on hJ1 subdivision is proposed for multimodal optimization problems. With this algorithm, the optimal problems converse to solution of fixed point problems. In this case, whether every individual of the population is a completely labeled simplex can be used as an objective convergence criterion and determined whether the algorithm will be terminated. Finally, a function is used to demonstrate the effectiveness of the algorithm through solving the minimum points distinguished by using the Hessian Matrix.
Thermal Performance Evaluation and Economic Analysis of LED Integrated with Thermoelectric Cooler Package
Authors: Qin Hong , Zhong Da Liang , Wang Chang Hong
Published: March 2011

Thermal management is an important issue for light emitting diodes’ utilization. For high power light emitting diode (LED), active heat dissipation method plays a vital role. As a new cooling device, thermoelectric cooler (TEC) is applied in LED packaging for the precisely temperature controlled advantage. In order to evaluate the thermal performance of the TEC packaging designs in LED, experimental measurement is used to assess the chip’s junction temperature of three different cooling models, which include the heatsink model, the heatsink and fan model and the TEC, heatsink and fan model. Based on the research, it is better to apply TEC cooling methods with the power dissipation of LED less than 35 W and the wind speed is 3.6 m/s. However, the power dissipation of TEC itself plays a vital role of the total power dissipation of LED packaging. The results of economic analysis shows that the LED integrated with TEC package achieves 22.34% and 44.73% electric energy saving under the condition of 20 W and 30 W power dissipation of the LED chip contrasts to the fluorescent lamp, but sacrifices 2.71% electric power under the condition of 10 W power dissipation of the LED chip.
Research on Folding Ripple in Shaftless Reform of Printing Machine
Authors: Ma Chun Min , Kang Cun Feng , Yang Jian Wu , Fei Ren Yuan
Published: March 2011

With the development of numerically control and digital drive, it is a trend to put the Electronic Line-Shaft (ELS) technology into printing machine instead of the Mechanical Line-Shafting (MLS). After the shaftless reform of a printing machine for a factory, it was found that the printing accuracy and speed of most printing units was improved observably except the folding ripple. The paper analyzes the formation reason of folding ripple and the different characteristics between ELS and MLS. The research result shows that also there are many advantages in using ELS the synchronous capability is less than MLS when a periodic disturbance act on them under the same transmission stiffness. Therefore it is proposed that the AC motors must connect directly to the main printing roller to decrease the periodic disturbance and to increase the stiffness during the shaftless reform of printing machine.
A Lightweight RFID Mechanism Design
Authors: Yu Song Sen , Peng Yun , Zhang Jia Jing
Published: March 2011

Based on the study of existing RFID security protocols and RFID anti-collision algorithms, this paper proposes a processing mechanism integrating lightweight random key double-authentication and dynamic slot-ALOHA protocol. The mechanism is simple, practical, and compatible with EPC Gen2 standards. Research shows that comparing with the other security protocols and anti-collision protocols, the new mechanism has a little complexity and tag-cost.
Contribution of Strain and Elasto-Optical Effect to Resonant Mode in the Two-Dimensional Photonic Crystals Force Sensor
Authors: Li Yan , Fu Hai Wei , Li Xiao Li , Shao Min
Published: March 2011

The resonant wavelength of the two-dimensional photonic crystal force sensor model changing with normal stress along y direction is calculated by finite-difference time-domain method. The result shows that the variation of the size and shape of the resonant cavity has a main contribution to the variation of the resonant wavelength. The elasto-optical effect of GaAs medium can not obviously change the wavelength of the resonant cavity below score of megapascal.
Color Locating of Ce3+ and Eu2+ Doped Calcium Magnesium Chlorosilicate UV-LED Phosphors
Authors: Shen Quan , Lu Man Man , Lin Hai , Li Chang Min
Published: March 2011

Color coordinates (0.1573, 0.0528) and (0.1542, 0.4663) have been identified in Ce3+and Eu2+singly doped calcium magnesium chlorosilicate (CMSC) phosphors, which present the purplish-blue and green lights under ultraviolet (UV) radiation, respectively. In Ce3+/Eu2+co-doped CMSC phosphors, with sensitizing the green emission of Eu2+, Ce3+co-doping changed the luminescence color from green to bluish-green, presenting a preferable mixed effect from two primary colors. Potential mixture of red phosphors will provide the possibility in achieving the ideal white fluorescence under UV-LED excitation.
The Application of Genetic Algorithm in Layout Design of Oil Rig Driller Console
Authors: Chen Bo , Deng Li
Published: March 2011

In order to avoid the shortage of subjective judgment, carrying on the human-machine interface layout scientifically, this paper put forward that the genetic algorithm was applied to the layout design of oil rig driller console. Using real number coding, combining with human-machine interface layout principles to establish the mathematical model, genetic algorithm was adopted to optimize the layout. Developed an intelligent layout optimization system on basis of VB, and took the layout scheme formation process of the manipulators which on the right hand area of driller console as an example to explain the system. Theory and example analysis showed that the algorithm could generate the layout scheme quickly and effectively, solved the problem that layout principles were difficult to be quantize in the traditional layout design and the quality of layout was hard to judge, and to a certain extent, has realized automatic layout.
Prediction Model of Twin-Arc High Speed Submerged Arc Weld Shape Based on Improved BP Neural Network
Authors: He Kuan Fang , Wu Ji Gang , Li Xue Jun , Long H.
Published: March 2011

Twin-Arc high-speed submerged arc welding forming quality prediction model was developed by three layers BP (Back Propagation) neural network. In the model, twin arc current, twin arc voltage, welding speed and wire spacing are selected for the study factor, weld pool width and penetration depth are weld forming quality indicators. The adaptive learning rate and additional momentum term are introduced to improve BP algorithm. Experiments show that the network structure is reasonable of the nodes by inputting and outputting layers of 6 and 2 respectively, hidden layer nodes are 13. The developed neural network model can predict the weld geometry with high computing and predictive accuracy of maximum predictive validation error of weld width and penetration depth within 9.6%, 10.3% respectively, which can be used for real-time monitoring of the quality of welding in the twin arc high-speed submerged arc welding process.
Digital Integrated Monitoring System of Mine Hoist Based on ARM
Authors: Li Xue Jun , Peng Z.Z. , He Kuan Fang , Pan Q.
Published: March 2011

The real-time respondent speed and the reliability play a deciding role on the performance of the digital monitoring for mine hoist. Differs to the traditional monitoring for mine hoist , it is possible to improve the signal respondent speed during upgrading of mine hoist by two methods, one is to adopt the quick microprocessor and another is the embedded real-time multi-task operating system. The Advanced Reduced Instruction Set Computer Machines (ARM) is particularly suitable to work as the controller of the digital monitoring for mine hoist with its merits as high running speed and complete peripheral equipments. The micro C/OS-Ⅱcan both improve the respondent speed against various signals from mining enterprises fields and the reliability of the controlling software as an embedded real-time operating system.The principle of task allocation is an important one of the highest priority related to the stability of mine hoist and functional tasks. To avoid multiple tasks simultaneously access the same shared resources, two semaphores are introduced to determine the access mechanism of the shared resource. Application of real-time operating system is the future of digital development of mine hoist.
Numerical Simulation and Optimal Design of a Novel Actuator Made of the Orthotropic Piezoelectric Composite Material
Authors: Sun Wen Bin
Published: March 2011

As a novel functional composite material, orthotropic piezoelectric composite material has been developed into various transducers used in the non-destructive technology and the structural health monitoring in aviation engineering, mechanical engineering, and civil engineering. In this study, the configuration and the mechanics-electric coupling property were described. A concept of the orthotropic ratio was proposed to derive the optimal length-to-width ratio of an actuator made of the orthotropic piezoelectric composite material. From the optimal length-to-width ratio, an optimal design method of the type 1-1 actuator, made of the orthotropic piezoelectric composite material, was advised. The mechanics-electric property of the type 1-1 actuator of orthotropic piezoelectric composite material designed by this approach was simulated with the software COMSOL under different actuating voltages. The modeling results were validated by experiments. It was evident that the results of numerical simulation were good agreement with that of experiments.
AE Signal of early Rotor Cracks Fault Diagnosis Based on PWVD and SVM
Authors: Li Xue Jun , Wang K. , He Kuan Fang , Li X.C.
Published: March 2011

Aiming at inaccurately and inefficiently fault feature of early crack by the vibration method in the environment of strong noise, the acoustic emission signal (AE) is used to cracks defect with the advantages of sensitive. The Pseudo Wigner-Ville Distribution (PWVD) is introduced to extract the amplitude and frequency of AE signal as feature vector, which combines with support vector machine (SVM) to achieve prediction and diagnosis of fault types of different rotor cracks depth. It is shown by experiment that the proposed method have the features of obvious frequency characteristic, early prediction of fault time, accurate and reliable diagnosis results of early cracks fault diagnosis.
Fault Diagnosis Method Based on Supervised Manifold Learning and SVM
Authors: Wang Guang Bin , Li Xue Jun , He Zhi Cheng , Kong Y.Q.
Published: March 2011

In order to better identify the fault of bearing,one new fualt diagnosis method based on supervised Linear local tangent space alignment (SLLTSA) and support vector machine (SVM) is proposed..In this methd, the supervised learning is embedded into the linear local tangent space alignment algorithm,making full use of experience category information for fault feature extraction, and then using linear transformation matrix to fast process the new monitoring data, finally distinguishing fault status of the incremental data by nonlinear SVM algorithm. The experiment result for roller bearing fault diagnosis shows that SLLTSA-SVM method has better diagnosis effect than related unsupervised methods.
Subpixel Edge Detection of Autofocus for Micro-Machine Vision System
Authors: Wu Ji Gang , He Kuan Fang , Qin Bin
Published: March 2011

Aiming at the subpixle edge detection of speckle in autofocus for micro-machine vision, a novel accurate subpixel edge detection algorithm was proposed. The image of the part to be inspected was binaried by simple threshold algorithm. The noise in image was eliminated by blob area threshold algorithm. The pixel level edge detection was done and the single-pixel width connected pixel level contour was acquired by binary mathematical morphological algorithm. The subpixel level edge detection was completed and the subpixel level contour was obtained by 9×9 pixel rectangular lens algorithm based on cubic spline interpolation. The example result indicate that calculation speed of the algorithm proposed herein is fast, anti-noise performance is high, inspection accuracy is high, and subpixel edge location accuracy can reach to μm level.
Reconstruction of the Flow Cross-Section Temperature Based on the Radiation Balance Between Infinitesimal
Authors: Liu R. , Wan X. , Zhang Z.M. , Xiao W.H.
Published: March 2011

The reconstruction of three-dimensional temperature field is a difficult problem. But three-dimensional temperature measurement can be simplified by the reconstruction of the flow cross-section temperature. In this paper, a theory of reconstruction is proposed and a simulation test system is implemented by MATLAB based on emission spectra tomography (EST) and radiation temperature measurement, which also take the emission and absorption characteristics in the processing of radiative transfer under consideration. Finally, by analyzing the difference of the original temperature and reconstructed temperature we can get the accuracy of the reconstruction theory.
Application of ANN in Preparing Technology of Magnesium Matrix Composites
Authors: Ye Jian Xiong , Zhang Fa Yun
Published: March 2011

SiCp/AZ61 matrix composites were fabricated by stirring process in the paper. Different SiC volume fractions, processing temperature and stirring time have different influence on tensile strength and elongation of SiC; it is very difficult to find out the best processing parameters with traditional method. An effective method is demonstrated here: The orthogonal experiment design method is put into use at first, and then a satisfied ANN(Artificial Neural Network) is achieved by help of GA’s(Genetic Algorithm) global optimizing capacity. Experimental results proved the prediction accuracy and the adaptability of our work.
Opcm Transducer and a Novel Standing-Surface-Acoustic-Wave Sensor
Authors: Sun Wen Bin
Published: March 2011

Standing surface acoustic wave (SSAW) technology combined with microtechnology opens up new areas for the development of advanced microparticle and cell separating microfluidic system. A novel SSAW sensor made of the orthotropic piezoelectric composite material (OPCM) is proposed and described. A SSAW field with target wavelength can be generated by this technology and with this new sensor. The wavelength of SSAW generated by this sensor can vary the range from several to a few hundred micrometers. The acoustic radiation force (ARF) generated by the SSAW field can be used to manipulate different dimensional particles.
Simulation of IP Fragmentation and Defragmentation on Linux with User Space Application
Authors: Liu Biao , Li Can Ping
Published: March 2011

TCP/IP is a typical layered protocol suite, and network protocol layering is the widely accepted rule. As studying TCP/IP, conceptually protocol layering is easy to understand, but TCP/IP stack usually is implemented in the kernel of Linux operating system, thus how layering protocol works is hard to know. After studying the IP fragment and defragment process in Linux kernel, a layered protocol defined in application level is designed, and a program based on this application layered protocol to simulate IP fragment and defragment is implemented in this paper. With this program, not only is the process of IP fragmentation and defragmentation in Linux kernel clearly displayed, but also the complete handling of a layered protocol is showed.
A Systematic Study of Solution Aging Time Impact on Surface Morphology of Sol-Gel Derived ZnO Thin Films
Authors: Shahzad Babar , Qi Yang
Published: March 2011

Pure ZnO thin films were spin coated on glass substrates using 0.5M Zinc acetate dihydrate precursor solution and then annealed at 500°C for 2h in air to get good quality thin films. The effect of sol-aging time, from as-synthesized to 4week aged, on microstructure and morphology of ZnO thin films was investigated. X-ray diffraction spectra revealed the polycrystalline wurtzite structure preferentially oriented along the (002) polar plane with variable peak intensity. AFM analysis exposed an asymmetrical cyclic morphology transition with sol-aging time from comparatively smooth surfaces with small spherical particles to a rigid wrinkle network of a high rms surface roughness value of at～42.4nm which finally untied and evolved as homogeneous surface of uniform grain distribution after 4 weeks of aging time. The minimum surface roughness of 1.6nm was obtained for the film prepared from 24h aged solution.
Design of a Weight Detection System for NI ELVIS II Based on LabVIEW
Authors: Huang Feng , Ouyang Xiang Jun , Deng Zhou Tai
Published: March 2011

The paper designed a weight detection system for NI ELVIS II based on LabVIEW. It could detect the weight of objects. It used resistive strain gauge sensors to connect to a full-bridge converter. It could detect the weight change signal and convert it to voltage signal. The voltage signal was send to ELVIS II after signal condition. The LabVIEW program displayed and analyzed the data. The results confirm its effectness.
An Improved Image Encryption Algorithm Based on a New Two-Dimensional Map
Authors: Huang Feng , Ouyang Xiang Jun , Liu Xing Ping
Published: March 2011

The paper analyzes a symmetric image encryption scheme based on a new chaotic two-dimensional map. The map can encrypt image. The numbers of the left-map and the right-map are used as the secret keys of encryption. A diffusion mechanism was used to diffuse the pixels of image. But it isn’t enough safe. Firstly there are a lot of week keys and duplicate keys. Secondly the diffusion mechanism is too simple to ensure the information security. The paper designs a new method of keys generation. The keys are non-zero and random. It has a large keys space and avoids the duplicate keys. Then it takes parts of keys as the parameters of a classic chaotic map. The process is the new diffusion mechanism. It solves the problem of weak keys. Simulation results show the effectiveness of the method.
Synthesis of Three Novel Aromatic Biazomethine Liquid- Crystalline Epoxy Resins and Curing Reaction with Aromatic Diamine
Authors: Gao Jun Gang , Zhang Xiao Na , Du Yong Gang
Published: March 2011

Three class of novel liquid crystalline epoxy resins containing azomething groups: N,N’-Bis[4-(2,3-epoxypropoxy)benzylidene]-4,4-diamino-diphenyl ether (p-BEPBDDE), N,N’-Bis[4-(2,3-epoxypropoxy)benzylidene]-4,4-diamino-diphenyl methane (p-BEPBDDM) and N,N’-Bis[(4-(2,3-epoxypropoxy)-benzyliden)-1,4- phenylene diamine] (p-BEPBPD) were synthesized and characterized. The results show that p-BEBDDE and p-BEBDDM belong to smectic texture and melting point is 239.5 and 178 oC, respectively. The p-BEPBD is nematic texture between its melting temperature (Tm) of 192 oC and clearing temperature (Ti) of 238 oC. The curing reaction can be described by Ozawa equation, and the alcohol-hydroxyl group can accelerate the curing reaction and decrease Ea in DSC experiment.
Electronic Structure, Effective Masses and Optical Properties of Monoclinic HfO2 from First-Principles Calculations
Authors: Liu Qi Jun , Liu Zheng Tang , Feng Li Ping
Published: March 2011

Electronic structure, effective masses and optical properties of monoclinic HfO2were studied using the plane-wave ultrasoft pseudopotential technique based on the first-principles density-functional theory (DFT). The calculated equilibrium lattice parameters are in agreement with the previous works. From the band structure, the effective masses and optical properties are obtained. The calculated band structure shows that monoclinic HfO2has indirect band gap and all of the effective masses of electrons and holes are less than that of a free electron. The peaks position distributions of imaginary parts of the complex dielectric function have been explained according to the theory of crystal-field and molecular-orbital bonding.
Research on the Photoelectric Conversion Efficiency of Grating Anti-Reflective Layer Solar Cells
Authors: Zhong Hui , Gao Yong Yi , Zhou Ren Long , Zhou Bing Ju , Tang Li Qiang , Wu Ling Xi
Published: March 2011

The effect of grating structure on the photoelectric conversion efficiency of solar cells is studied with the finite-difference time-domain method. The influence of grating shape, height and the thickness of coated metal film is analysed. It is found that the variation of grating shape and height makes great changes of energy storage, especially of the photoelectric conversion efficiency and energy storage of the triangle grating. The comparison between un-optimized and optimized surface grating structure on solar cells shows that the optimized grating surface significantly increases the energy storage capability and greatly improves the efficiency.
Dependence of Transient Current and Capacitance of Organic Light-Emitting Diodes on Pulsed Bias Conditions
Authors: Zhang Yong , Yu Jian Ning , Sun San Chun , Wei Bin , Zhang Jian Hua , Cao Jin
Published: March 2011

We have employed a simple circuit combining pulse generator and capacitance meter to investigate transient current (TC) and capacitance of organic light-emitting diodes (OLEDs). The dependence of TC on OLEDs structure with the change in thickness of hole transport layer (HTL), and pulse regimes with the change in voltage and frequency have been studied. Results revealed that two different evolution pattern of TC at low and high electric fields, and the change in HTL affected TC much greatly at high electric fields. The capacitance-voltage curve with different frequency was observed and showed trapped- charge state and interfacial charge transport process near the electrode.
Forecast and Processing of Weak Electrical Signals in Clivia miniata by RBF Neural Networks
Authors: Ding Jin Li , Wang Lan Zhou
Published: March 2011

Original weak electrical signals in Clivia miniata were tested by a touching test system of self-made double shields with platinum sensors. Tested data of electrical signals denoised by the wavelet soft threshold and using Gaussian radial base function (RBF) as the time series at a delayed input window chosen at 50. An intelligent RBF forecasting system was set up to forecast the signal in plants. Testing result shows that it is feasible to forecast the plant electrical signal for a short period. The forecast data can be used as an important preferences for the intelligent automatic control system based on the adaptive characteristic of plants to achieve the energy saving on agricultural production both the greenhouse and /or the plastic lookum.
Research on the Identification for a Nonlinear System
Authors: Lv Shi Liang , Liu Jin Guo , Jia Ping
Published: March 2011

The characteristic of the drift error of inertial platform is a high-order nonlinear dynamic system, using the neural networks’ abilities of universal approximation of differentiable trajectory and capturing system dynamic information, this paper presents the drift error identifying project of inertial platform based on Elman networks structure. First, the drift error model of inertial platform is established, after selecting the input and output for network, momentum and alterable speed algorithm is used to speed up the network convergence. On the basis of the algorithm, the extended nonlinear node function in the hidden network does not only improve the learning speed of network, but also satisfies the need of accuracy on system identification. Through the drift error data measured on inertial platform, the training result shows that the scheme achieves satisfied identification results.
Numerical Investigations of Young’s Modulus for Composites with Inclined Glass Fiber for Wind Energy Application
Authors: Wang Huai Wen , Gui Le Le , Zhou Hong Wei
Published: March 2011

Young’s Modulus of glass fiber reinforced composites for wind energy applications are studied using numerical method. The effect of volume content of glass fiber on the Young’s modulus of composites is investigated. Results indicate the relation between them is nearly linear. In order to explore the effect of inclined angle of fiber on the Young’s modulus of composites, different finite element models with inclined glass fiber are developed via the ABAQUS Scripting Interface. Results indicate that Young’s modulus of the composites strongly depends on the inclined angle of fiber. A U-shaped dependency of the Young’s modulus of composites on the inclined angle of fiber is found, which agree with the experimental results. The results of the investigation are expected to provide some design guideline for the microstructural optimization of the glass fiber reinforced composites.
Effects of Vanadium Microalloying on Hardness of Alloy ZG270-500
Authors: Wang Hai Tao , Huang Bing Xi , Wang Li Jian
Published: March 2011

The effects of vanadium microalloying on the hardness and its distribution of alloy ZG270-500 smelted in intermediate frequency induction furnace were studied. Vanadium microalloying increased the hardness of test alloys effectively. By scanning electron microscope (SEM) and energy disperse spectroscope (EDS) analysis, it was found that VC was the powerful heterogeneous nuclei, which prompted numerous nucleating, refined the structure grains and caused the serious crystallographic lattice distortion, so the hardness increased. Proper content of vanadium prompted more even hardness distribution across the whole temperature front section. However, overdoes vanadium microalloying easily caused mass oxides of V2O3, which kept solid phases with high meting point in metal liquid to increase the viscosity and decrease the fluidity of metal liquid, resulting in inadequate metal liquid feeding, serious structure shrinkage porosity in center and worse hardness distribution along the different isotherm fields. 0.16wt.% vanadium microalloying brought the optimal hardness uniformity among test alloys with the approximate 1 hardness ratio R between the center and the margin.