bluuebunny/crossref_metadata_2025 huggingface dataset:
The Synopsis of Stability in Wind Power Systems Based on Bifurcation Theory
Authors: Ma You Jie , Zhang Yu , Zhou Xue Song
Published: December 2012

Nowadays energy is the important foundation of modern national economic development. Electric power as the main form energy supply is very close to the national economy, the consumption of social power energy represents the development of modern society [2]. In recent years all countries in the world are seeking to develop alternative energy in actively, exploring the sustainable development of the energy strategy. The wind power is a renewable energy which can be used in large-scale, and this power is friendly to environmental and makes for sustainable development.
Study on Cohesive Zones in COREX Melter Gasifier Using Hot Model
Authors: Sun Ye , Wu Guo Xi , Chen Ren , Sun Li Na , Han Li Hao
Published: December 2012

A hot model is established to study the cohesive zone of COREX melter gasifier in this paper., in this experiment, the paraffin and corn are used to simulate DRI, coke and lump coal respectively, the influences of ore/coke volume ratio, raceway gas temperature and raceway gas volume on the cohesive zone are analyzed using image processing method.
A New Assessment Method for Energy Consumption of Thermal Power Unit
Authors: Luo Bin , Ma Rui , Chen Yuan Xin , Xu Gui Lin
Published: December 2012

Energy consuming condition of thermal power unit is reflected by its historical operation data, but the amount of data and the number of energy consumption indices are large. And there are complex and strong correlations among them. These make it difficult to assess the energy consuming condition of unit. This paper proposes a model and method based on improved Principal Component Analysis(PCA) assessing the energy consuming condition of unit. Those assessment problems are solved well by the application of feature extraction and dimensions reducing functions of improved PCA. Meanwhile, traditional assessments’ drawbacks-subjectivity and uncertainty are avoided because the weights of components are determined completely according to the data. Finally, the feasibility and effectiveness of the proposed model are demonstrated with a case study involving energy consumption condition analysis of a 600MW unit in China.
Study the Heat Sink Potential of Building Ground Floor Slab Integrated with ELT
Authors: Al Hasan Abdullah , Abu Eusuf Muhammad
Published: December 2012

The aim of this paper is to investigate the heat sink properties of ELT (end-of-life tyres) waste. A hazardous waste, ELT or massive scraped tyre waste created environmental load to the local environment. Today, when researchers think of the environmental impacts of tyres, they mostly focus on the management of tyres at the end of their useful lives. From Global perspective it is found that one billion tyres reach the end of their useful lives annually, out of which about four billion ELTs are currently in landfills and as stockpiles worldwide. Study revealed that most of the developing countries currently are not experienced with the disposal method of ELT. Besides, developed countries from Europe, USA, Japan and Singapore have framed specific law or regulation to the disposal of ELT. Recently it is obvious that should find out alternative ways as to reduce the load of massive ELT waste. Furthermore, this study has been designed to manage ELTs massive waste, experimentally. Due to fact that this research followed by an effective experimental set up to observe the real phenomena of ELT for passive cooling in hot humid and tropical climate and make comparison with conventional construction materials and systems.
Construction Technology and Economic Analysis of Ground-Source Heat Pump System
Authors: Yuan Zhi Yang
Published: December 2012

Basic principles and construction technology of ground-source heat pump system have been briefly introduced and ground-source heat pump system has been compared with conventional air conditioning systems. Technical and economic analyses have been made of its ground-source heat pump system by combining the project case of large railway passenger station building in this paper. Finally, by combining the statistical data and economic comparison of the operating costs of ground-source heat pump system, this paper has explained the better economic rationality of large railway passenger station building using ground-source heat pump system.
The Stirring and Heating CFD Simulation Strategic Research on Food Waste Biological Treatment Processor
Authors: Song De Yu , Lin Song
Published: December 2012

By analysis the physics parameter of food waste, considering about using CFD technology for the stirring and heating simulation strategic research, guides the stirring structure and heating effect design.Focus on the three layers horizontal paddle Stirring processor’s dealing process for the entity modeling, and considering using MRF method, choosing the Low-Re RNG-κ-ε turbulent mode, heating from the surround of the equipment, meanwhile by insert one solar heat pipe into the middle shaft for the simulation strategic research. The research has actual guidance significance on how to improve the processing efficiency.
Modal Analysis of Large Marine Crankshaft
Authors: Zhao Yang , Cao Shou Qi
Published: December 2012

Based on the modal analysis of finite element theory, in this paper, a 3-D model is built in CATIA. And simplify the details of the characteristics and constraints depengding on working condition. The Lanczons method of ANSYS software is used in the model analysis in order to obtain natural frequencies and vibration mode vectors of the former 15 orders. And the dangerous areas is located in the crankshaft. These provide a theoretical basis for the optimized design of the crankshadft.
The Properties of Two-Way Cartridge Valve in Water Hydraulic through Matlab/Simulink
Authors: Duan Zhen Hua , Wu Zhang Yong , Wang Qing Hui , Wu Xi , Wen Cheng Zhuo
Published: December 2012

According to the requirements of hydraulic transmission to two-way cartridge valve, and from the practical point of view a water hydraulic two-way cartridge valve was designed. Then its structure characteristics was introduced and the mathematical model was established. The simulation analysis of the water hydraulic two-way cartridge valve has been carried out through Matlab/Simulink proving that its structure was reasonable and it had good performances.
Repairing Incomplete Measured Data for Reverse Engineering with Anatomical CAD
Authors: Li Tian , Cheng Si Yuan , Wang Xue Peng , Yang Xue Rong
Published: December 2012

The repairing of incomplete measured data caused by the inaccessibility or invisibility of some portions of the product surface for measure tools plays an important role in Reverse Engineering. The fundamental principles of Reverse Engineering and Anatomical CAD are introduced. The main functional advantages of 3-matic package integrated with Anatomical CAD are presented. There is a big difference in the working flows between Anatomical CAD and traditional CAD packages in the process of RE data repairing. In this paper, we propose a new method of data repairing based on Anatomical CAD. The point cloud of the stamping part obtained by a Potable CMM is repaired successfully by 3-matic, which reduces preparation times by working with a triangular mesh directly, and saves the turn-around time and works more effectively.
Research on Conjugate Heat Transfer in Mechanical Seals of the Aircraft Engine
Authors: Li Jian Ke , Mo Rong , Yang Hai Cheng , Wang Zeng Qiang
Published: December 2012

According to the mechanical seals’ characters of the aircraft engine: no special flush fluid equipment and the limited space etc, a numerical model of conjugate heat transfer between seal rings and seal chamber is presented. And the flow channel and the flow quantity in the mechanical seal are studied, which will affect the heat transfer between the surface of the seal ring and the flush fluid. At last, the studied results are validated by the test.
Research on Increasing Hob Tip Fillet Radius to Decrease Addendum Modification Coefficient
Authors: Zhao Xiang Fei , Lin Yu , Liu Hong Qi , Zhang Jie
Published: December 2012

Reasonable design of hob tip fillet and calculation of modification coefficients were researched to avoid undercutting in this paper. The undercut gears were generated in the virtual environment based on Pro / E software. Meanwhile, parametric finite element models of undercut gear, ordinary modified gear generated by standard hob and modified gear generated by hob with tip fillet radius increased,were founded by APDL (ANSYS Parametric Design Language).The results show that the minimum modification coefficients chosen to avoid undercutting by traditional modification method may not meet the requirements of contact ratio or addendum thickness.While through reasonable design of hob tip fillet, modification coefficients calculated not only avoid undercutting to improve the tooth bending strength but also meet the requirements of contact ratio ε>1.2 and addendum thickness δ>0.25m (module) .
Research on the MIS of Product Drawing Based on UML
Authors: Xu Jiang Tao , Li Long , Liu Ping Ping
Published: December 2012

Around the development process of product drawing management system, a model is established by making use of unified modeling language (UML). The whole process from function analysis system design and physics model design and system development is described by a series of diagrams. The model makes a complex command system expressed in plain and visual graphics; it provides the valid path to the MIS of product drawing system.
Research on the Model of Inventory-Transportation Integrated Optimization for the Supply Chain with Road Capacity Considerations
Authors: Li De , Jiang Da Li , Yao Ping
Published: December 2012

With the rapid development of economy, effective management for a supply chain in the modern enterprise has become increasingly important. The inventory-transportation integrated optimization is from the systematic and integrated idea, to integrate the inventory control and transportation scheduling as a whole and optimize the supply chain. Base on this, the paper aims at the structure of singer distribution center and multi-vendor in the supply chain network, research the collaborative decision strategy for a multi-level inventory and establish the corresponding inventory-transportation integrated optimization model in the case of road capacity limit. At the end of paper, we have given an effective algorithm to solve the model.
Research on Wrapping Angle Compensation Technology of Cold Strip and its Industrial Application
Authors: Kong Ling , Yang Li Po , Yu Bing Qian , Wang Dong Cheng
Published: December 2012

In the paper, the cold strip online dynamic wrapping angle compensation model is established based on the latest intelligent shape meter developed by Yanshan university. It could improving recisions of the shape detection and the shape closed-loop control under specific working conditions effectively. The model was successfully applied to Angang HC 6-high reversible cold rolling mill, meeting bad working conditions on site. The remarkable results were obtained in industrial application. The error between calculated values and measured values of total tensions is within 3%.
Study on High-Order Elliptical Gear Parametric Design, Automatic Modeling and Motion Simulation
Authors: Xie Z.H. , Qiu D.M.
Published: December 2012

In this paper, the high-order elliptical gear design principle and methods were studied based on Solidworks API to accomplish high-order elliptical gear parametrical design, machining simulation and automatic modeling. Elliptical gear pair simulation was carried out for verification. The high-order elliptical gear modeling method proposed was to use gear hob type of envelope processing method with the advantages of being able to process concaved pitch curve of high-order elliptical gear. The idea of this design process can also be extended to other types of non-circular gear design and modeling.
Numerical Simulation of Temperature Field of Low Alloyed Bainite Ductile Iron in Austempering
Authors: Wei De Qiang , Zhao Yun Qing , Wang Rong , Chen Hu Cheng
Published: December 2012

It has an great significance for making heat treatment technology by researching the law of temperature variations of ductile iron in austempering. Based on the three-dimensional finite element method (FEM), the temperature variations of low alloyed bainite ductile iron in austempering are studied in this paper. The temperature relativity of the thermal physical parameters is considered during building the model. The simulation result demonstrates that during the stage of rapid cooling, the cooling speed of the surface is faster than that of the center, and the whole cooling speed increases firstly, then decreases. During the stage of isotherm, the surface temperature of the sample increases to the isothermal temperature directly, while the center temperature decreases firstly, then increases, until to the isothermal temperature.
Effects of Particle Size and Distribution on the Microstructure and Mechanical Properties of SiC Reinforced Al-30Si Alloy Composite
Authors: Ni Zeng Lei , Wang Ai Qin , Xie Jing Pei
Published: December 2012

This paper studied the combined effects of particle size and distribution on the mechanical properties of the SiC particle reinforced Al-30Si alloy composites. The microstructure of experimental material was analyzed by SEM, the tensile strength and physical properties were examined. The results show that, with the increase of the SiC particle size in the composites, the clustering degree of the SiC particles decreases in the matrix, the SiC particles distribute more ununiformly. The tensile strength is influenced by the SiC particle size, the tensile strength of the composite reinforced by 13μm sized SiC particles is the highest.
The Design of Scroll Compressor Scroll Plate Matching System
Authors: Liu Guo Ping , Chen Zhong Yang , Yang Juan , Hu Rong Hua
Published: December 2012

In order to improve the quality of the scroll compressor scroll plate assembly, presents computer aided matching system, establish the matching system framework, the scroll plate matching model contains a hierarchical relationship, the matching relationship between the parts and the matching principle information, to use .NET development platform and SQL Server 2005 database management platform, develop the matching system and manage a huge amount of matching data, making the matching process is quick, accurate, and matching interface is simple and easy to operate; Finally, to introduce the running of the whole system.
The Design of Screw-Drive Mechanism for Testing Device
Authors: Tan Ying Jie , Zhang Chang Ming
Published: December 2012

The main structure of bearing frame for pressure test device and it’s functions are described in this paper. For the pressure test device with float collar and float shoe, the screw transmits movement with standing pressuring load. According to the needs of actual production and the requirements of test sample pressuring, this paper designed a drive mechanism for screw rod, calculated the stress and checked the correlated stiffness. The result shows that it is reasonable, safe and reliable for screw-drive mechanism, depending on the operation behavior of float collar and float shoe pressure test device.
Theoretic Analysis of the Effect of Real Gas on the Performance of the T-Groove and Radial Groove Dry Gas Seal
Authors: Hu Xiao Peng , Song Peng Yun
Published: December 2012

Dry gas seal is a kind of non-contact seal in which gas dynamic and static pressure forming opening force, being with less gas leakage and longer using time. Generally speaking, the gas performance of the dry gas seal is regarded as an ideal gas when the dry gas seal is investigated, designed, and operated. However, some real gas performance may be quite different from the ideal gas when the gas pressure is high. Some gases, such as carbon dioxide, hydrogen and nitrogen, are considered, both the T-groove dry gas seal and the radial groove dry gas seal are analyzed. The virial equation of state is used to express real gas performance, and the effect of real gas on the performance of dry gas seal is analyzed. The results show the maximum relative of opening force error is -4.98% and the maximum relative error of leakage is -20.11% for carbon dioxide; the maximum relative error of opening force is -0.46% and the maximum relative error of leakage is 2.47% for hydrogen; the maximum relative error of opening force is -0.04%, and the maximum relative error of leakage is -0.16% for nitrogen. So the effects of real gas of carbon dioxide and hydrogen have much influence on the performance of the dry seal; but the nitrogen has less influence on the performance of the dry seal.
Design of Three-Phase CDROM Motor Driver Chip by Using a 0.6um CMOS Process
Authors: Chen Shen Li , Ou Hsiang Pei
Published: December 2012

This paper deals with the design and analysis of a three-phase CDROM motor driver chip using a 0.6um CMOS process. An analysis of this circuits system, it is found that the driving current can be up to 500mA as in the three-phase DC motor operation. In the CMOS process, a lot of component, i.e., control and power circuits are integrated in the same chip. Here, we will focus on the design of high-current driver part and present the results obtained from the motor operating at different situations.
Effects of Two Cracks in Shafts on Dynamic Characteristics of Two-Span Rotor-Bearing System
Authors: Luo Yue Gang , Zhang Song He , Wu Bin , Hu Hong Ying
Published: December 2012

The nonlinear dynamic model of two-span rotor-bearing system with two cracks in shafts is set up, and the effects of two cracks in shafts on dynamic characteristics of the rotor-bearing system are analyzed. Along with the increase of the crack depth in first span, the chaotic and periodic motions increase, and the quasi-periodic motion decrease in the supercritical rotate speed. There are harmonic elements of 1/4, 1/2 and 3/4 frequency division within the sub-critical speed range at different crack depths. There appears the frequency doubling resonance obviously when the crack depths are larger. Along with the increase of the crack depth in second span, the main influences to the responses of system are in the second span. The chaotic regions increase and then decrease and the periodic motions region increase in the sub-critical rotate speed range.
ESD Robustness Designs for the HV Power DEMOS
Authors: Chen Shen Li , Chu Chi Ling
Published: December 2012

Two kinds of efficient electrostatic discharge (ESD) protection circuits in lateral drain extended MOSFETs (DEMOSFETs) will be designed and investigated in this paper. One kind of these test samples is fabricated with an SCR structure, which has the lowest turned-on resistance when it is triggered by a high voltage of ESD event. The SCR circuit is the most efficient of all protection devices in terms of ESD performance per unit area. Furthermore, the other type of these DUTs is an SCR with RC-triggered structure, which will have a small trigger voltage (Vt1) under ESD event, and then it obtains a good ESD immunity level.
Finite Element Analysis of 6-Wing Synchronous Rotor in the Mixing Process
Authors: Liu Cai Jun
Published: December 2012

By use of finite element method to analyze the strength of 6-wing synchronous rotor, and illustrate the change of parameters regarding strain, stress and displacement etc. so as to visually see whether the designed rotor will reach the design requirements; meanwhile, through structural analysis, to provide guidance for the further optimization of designing for 6-wing synchronous rotor.
Frequency Reliability and Sensitivity Analysis on the Rotor System
Authors: Lü Chun Mei , Zhang Yi Min , Li He , Wang Xin Gang , Liu Yu
Published: December 2012

Multispan rotor system(H858 compressor) is studied in this paper. Based on the rotor dynamic theory, complex rotor system is simplified reasonably, and finite element model is established using finite element software(MSC.Patran&Nastran). The natural frequencies are obtained in the condition of bending vibration, and the functions of frequencies and variables are matched on the basis of the artificial neural network (ANN) technique. With the criterion that the absolute value of the difference between the natural frequency and forcing frequency, the reliability mode and the systems safety probability are defined, then the frequency reliability sensitivity analysis method is presented. And the equations of the related sensitivity with respect to mean values and variances are mathematically expressed. The reliability and sensitivity of rotor system are analyzed, which demonstrate the effectiveness and accuracy of the proposed method.
Hydrodynamic Performance Analysis of the Bionic Impeller Equipped with Little Angle Arc Lamina
Authors: Bai Xiang Hua , Lv Jian Gang , Zhao Zhi Ning
Published: December 2012

This paper mainly imagined and designed a bionic impeller with arc shape lamina especially little arc lamina, researched on its hydrodynamic performance on the base of the prior hydrodynamic performance research on straight panel shape lamina. Applied FLUENT software to gain the figures on lift force, propulsion, pressure nephogram, velocity diagram and volume fraction distributing of bionic impeller when depth h is at -7.5 cm, 0cm and 7.5 cm, discussed and analyzed the rules of hydrodynamics when h was altering, tamped the groundwork of optimizing the externality design of the bionic impeller further.
Innovative Design of Range Hood Based on Folding Structure
Authors: Yang Mei , Ding Ning , Bo Qi Fang , Han Peng
Published: December 2012

In modern society, people have not only the functional requirements of the product, but also the pursuit in its spiritual sustenance. Based on the concept of the folding structure, this thesis extracts the essence of the folding structure design from typical product design, then analyzes the style and structural features of range hood in depth, puts forward the design concepts and innovative solutions of range hood, and, designs a pull-out range hood which saves space and achieves a combination of Chinese traditional elements with modern design perfectly.
Integrated Unit Technology for Gas Field Surface Gathering and Transmission
Authors: Li Jin , Zhao Jian Yang
Published: December 2012

In combination with the author's experiences in design for integrated unit for natural gas field gathering and transmission, this paper describes conventional practices and technical characteristics of integrated unit in the processes of standardization design and modularization establishment and analyzes the initial application of pneumatic control ball valve, wedge-shaped flowmeter and other new technologies for surface facilities in the gas field. As a result, a new design idea is proposed in this paper, i.e., to improve the integration level of surface facilities, to minimize power consumption and maintenance works and to realize unattended work mode.
Spiral Reinforcement in the Role of Prestressed Anchorage and Nonlinear Research
Authors: Yang Bao Dong , Zhu Wan Xu , Ju Hong Chang , Zhang Feng , Fu Wei , Yang Ti Xu
Published: December 2012

Through the equipped with spiral reinforcement of the prestressed anchorage performance test, verify the spiral reinforcement for anchoring system the function and necessity. And using finite element analysis software of prestressed member was compared and analyzed, analyses the influence of the spiral reinforcement of concrete and the spiral reinforcement stress distribution.
Numerical Analysis of Flow Field and Performance Optimization of Axial-Flow Pressure Reducing Valve
Authors: Li Shu Xun , Xu Xiao Gang , Hou Ying Zhe , Li Que
Published: December 2012

In order to promote the technical progress of pressure reducing valve in nature gas transport system, a high pressure pilot operated axial-flow pressure reducing valve was designed and developed. The three-dimensional modeling of the natural gas pressure reducing valve internal flow passage was found by using Solidworks software. Import the flow channel model into meshing in CFD software based on the internal flow channel geometry and flow characteristics. The ideal gas compressible fluid model of natural gas and improved RNG k-Epsilon model were used to solve the pressure and velocity distribution as well as other flow related parameters of the natural gas pilot operated pressure reducing valve. The flow fields of the pressure reducing valve with different valve plug shape were analyzed. Changes of valve plug shape were made to improve the performance of the valve.
Numerical Simulation and Experimental Research on Multi-Position Progressive Stamping Process of Automotive Structural Part
Authors: Xia Qin Xiang , Xu Teng , Wei Guang Ming , Ye Fu Yuan
Published: December 2012

Multi-position progressive stamping is widely used in industrial fields, such as electronic, automobile and appliance, etc. Finite element numerical simulation has been an effective method to analyze the deformation of multi-position progressive stamping, the progressive die with 13 positions for the high strength steel automotive soleplate component part was manufactured based on the FEA simulation results obtained by multi-position multi-operation modeling method, and the corresponding progressive stamping experiments were carried out. The experimental results of the forward deep drawing of position 3 were further compared with the simulation ones, the results conform well to each other.
Numerical Simulation of Quenchant Flow Characteristics in Large Quench Tank
Authors: Sun Hui
Published: December 2012

The computational fluid dynamics (CFD) technique is employed to predict the flow of quenchant in a large quench tank. The characteristics of flow field in the existing quench tank are investigated, and the major deficiency occurred in the tank structure design is analyzed. Two different schemes for improving the tank structure design are brought forward, and further numerical simulations are carried out. Results show that the non-uniform flow field is generated throughout the quenching zone in the existing large quench tank. There is clear difference in flow rate in the regions near the inner surface of workpiece and the outer, which may cause the workpiece distortion and even cracking. Reduction in ring pipe intermediate diameter can not obviously enhance the uniformity of flow field in the quench tank. By adding an inner core in the center zone of the tank, the flow rate in the region near the inner surface of workpiece can be increased effectively, and the flow rate difference found in the quenching zone reduced significantly, which are beneficial to guarantee the quenching quality of workpiece.
Parameter Optimization and Analysis of Pellet Mill
Authors: Jiang Qing Hai , Sun Yu , Wu Kai , Xia Xian Fei
Published: December 2012

According to the analyses on the forming principle of the pellet mill and the relative motion state between the roller and the die during the extrusion process, the mathematical models of the extruding height of material and the extruding velocity of the material were developed. Based on the models, the influences of the radius ratio λ of the roller and the die and the maximum seizing angle θ on the maximum extruding height of material hmax and the pellet quality were analyzed and calculated. The calculation results show that the increases of θ and λ in a certain range are beneficial to the production yield, increasing the effective work area, and improving the pellet quality. The results provide a theoretical basis for optimizing structural design of the pellet mill.
Parametric Vibration Responses of Electromechanical Integrated Toroidal Drive
Authors: Hao Xiu Hong , Zhu Xue Jun
Published: December 2012

There are periodic changes of meshing teeth in electromechanical integrated toroidal drive, that lead to time-varying meshing stiffness. By converting time-varying stiffness into the form of Fourier series, dynamics model and the corresponding differential equation of parametric vibration system are established. Then approximate analytical solution of the system is obtained by multi-scale method, and time domain response curves of damping vibration system are given. The analysis results show that free vibration of the system not only include natural frequency, but also contains combination frequencies between natural frequency and meshing frequency. So there are multi-resonance frequency sections. Those will provide more theoretical supports for system dynamic design and optimization.
Structural Design Optimization of the Rotary Table of a Floor Type Boring Machine for Minimum Weight and Compliance by Using GA
Authors: Lee Hyun Bok , Oh Ji Han , Oh Chang Hwan , Choi Young Hyu
Published: December 2012

Recently needs of extra-large floor type boring machines have been increased according to super-sizing ships and aircrafts including wind turbines. The rotary table of a supersize floor type boring machine to be developed in this study can support ultra heavyweight workpieces more than 200 tons and be rotated with a speed of 300 deg/min. Therefore, it is designed as a high rigidity structure and requires high rigidity bearings. Thus, hydrostatic bearings are used in this rotary table. For optimizing the rotary table of a floor type boring machine as a lightweight and high rigidity structure, an optimized design is performed using an FEM structural analysis and a genetic algorithm (GA). As a result, it represents a decrease in weight 22.2% and an increases in rigidity 8.56% compared to that of the conventional method based on empirical design.
Study of the Model and Algorithm in Linear Programming of Maintainability Growth Project
Authors: Liu Hui , Hao Jian Ping
Published: December 2012

In order to solve the planning problem of maintainability growth project, study of the model and algorithm in linear programming of maintainability growth project is put forward. Firstly, the linear relationship of factor and target as an example, the mathematical model of maintainability growth project planning is put forward in the article, and a general solution method is mentioned. Then according to the maintainability growth problem’s characteristic, the algorithm is improved. A solution method is brought out which is about simplex method with variable changed form 0 to 1- γi. This Algorithm makes the solution of maintainability growth project planning become much simpler than before.
The Application of the Product Design Knowledge Classification System within a Distributed Knowledge Resources Environment
Authors: Ma Xue Fen , Dai Xu Dong
Published: December 2012

The design knowledge classification is the basis of knowledge search. The extended six-dimension design knowledge classification system mainly includes the extended discipline, product, application process dimension and resource unit, expression pattern, design domain dimension. In a distributed knowledge resources environment, the product design activities usually are participated by three roles, design entity, resource units and design knowledge resource register center. Based on this classification system, this paper analyzes in detail how it is used by these three roles to support the design knowledge search and puts forward to the resource unit and design resource register center knowledge classification model.
The Topological Optimization of High-Speed Vertical Machining Center Worktable
Authors: Lin Huan , Gao Dong Qiang , Zhang Fei , Yi Jiang Miao
Published: December 2012

In this paper, high-speed vertical machining center of the four schemes(namely general reinforcement worktable, strength general reinforcement worktable, diagonal reinforcement worktable and strength diagonal reinforcement worktable) has been entity modeling in Soldworks. After modeling, do finite element analysis and stiffness analysis to four schemes, the conclusion shows strength reinforcement worktable is the best plan. Then, do modal analysis in order to improve the inherent frequency, get the modal of the system frequency and vibration mode. Finally, according to the results of analysis of static dynamics, in order to improve the natural frequencies of strength general reinforcement system, the worktable has been topological optimization. Because of the result of the topological optimization is not obvious, so choose workbench is verified by reasonable structure.
The Finite Element Analysis of Shield Disk Cutter Based on Different Working Conditions
Authors: Zeng Qing Liang , Cui Zhe , Wang Jun , Wang Yi Ran , Meng Hu
Published: December 2012

The shield machine is a large complete sets of equipment used for underground tunnel excavation in the city construction,it has been widely used in the tunnel excavation. Cutter is one of the key components of shield machine. Different geological conditions and badly application environment make the cutter stress complex. German Herrenknecht S749 shield cutter as an example, using PRO/E software to establish the three-dimensional model, ANSYS Workbench module establishes the cutter corresponding finite element calculation model, the force characteristics of the cutter in working process were analyzed, obtained the cutter`s stress strain distribution. The research results can provide basic data for the wheel structure design and construction maintenance.
Design and Implementation of a Smart Home Based on WSN and AMR
Authors: Wang Hui Yong , Wang Jing Yang
Published: December 2012

The purpose of the smart home application is to devise a set of intelligent home appliances that can provide an awareness of the users’ needs, providing them with a better home life experience without overpowering them with complex technologies and intuitive user interfaces. There are a large number of reseaches dealing with Wireless Sensor Networks(WSN) applications, but it is still possible to explored in WSN development and maintenance. The WSN paradigm has been stimulated by considering the integration of the WSN with sophisticated Autonomous Mobile Robots(AMR), having advanced mobility,processing and communication capabilities. The complementarities of the WSN and AMR technologies may result in a symbiotic coexistence with mutual advantages for both systems and may enable novel services in advanced scenarios,such as ubiquitous robotics,networked robotics,ambient intelligence. AMR can be considered to be mobile nodes that provide additional sensorial information, improve/repair the connectivity and collect information from wireless sensor nodes. On the other hand, the WSN can be considered as an extension of the sensorial capabilities of the robots and it can provide a smart environment for AMR. This paper examines the possibility of integration WSN and AMR into a smart home application.
The Future of Materials in Mimicking Strategy
Authors: Wang Xue , Li Tie
Published: December 2012

This paper uses sense of trust of materials in mimicking strategy as the starting point to investigate and analysis Chinese local design in lack of trust problems from the views of the status of Chinese manufacturing, the reasons for suffering a crisis of confidence and product positioning of Chinese materials. If they want improvement, advancement, and the happiness index, they have to take it slow. Chinese design not only needs domestic and international markets, but also needs to convey the inner spirit of Chinese nation. The economic development, population growth, the rise of cities and the increase of desire makes us far and far away from our heart. People’s distress that comes from large and small alienation of civilization makes the majority of designers mechanical mimic others, and forget the center of Chinese culture and insistent principles. The times is calling for new Chinese materials form, but only China can respond us this form, while in the trend of this large period, we should give the Chinese design and culture sense of trust.
Adaptive Control for the Twin Rotor Helicopter with Actuator Faults
Authors: Zhang Shi Jun , Chen Fu Yang , Tao Gang
Published: December 2012

For the linear time-invariant model of a twin-rotor helicopter, a new control scheme is proposed in the presence of actuator faults, environmental disturbances and modeling errors. Using the Lyapunov stability theorem, the system with proposed adaptive controller is proved to be stable, and the tracking error tends to zero asymptotically. Simulation results prove the effectiveness of this method.
Study on the Dramatic Decrease in Surface Resistance of Insulation Films on Non-Oriented Silicon Steel after Stress Relief Annealing
Authors: You Guang Ming , Li Na , Li Wen Hao , Liu Jian Zun , Kong Xiang Hua
Published: December 2012

Now insulation films are often prepared by smooth rubberroll on the surface of non-oriented silicon steel sheet. Though the surface resistance is enough high to ensure the quality, it will dramatically decrease after stress relief annealing. In order to understand the related mechanism, the film’s microstructure was characterized by SEM. The results show that the main composition of semi-inorganic coating is Cr, Mg C and O, in which C come from the organic polymer. According to the composition, the insulation film can be divided into two parts, the outer one is organic polymer and the inner one is chromate. The main reason for the unstable surface resistance is that the coating in the thickness direction is not uniformity.
Deformation Analysis Method for Aeronautical Thin Walled Structures with Automated Riveting
Authors: Cheng Hui , Li Yuan , Zhang Kai Fu , Guo Feng
Published: December 2012

The assembly variation of Aeronautical Thin Walled Structure (ATWS) with automated riveting is inevitable. The deformations of drilling, riveting and releasing are ralated to the final assembly variation. This paper represents a new method for deformation analysis of ATWS with automated riveting. Drilling deformation is modeled by the relationship among deflexion, strain and stress, riveting deformation is modeled by uilibrium equation, and releseaing deformation is modeled by releasing force. The comparison between computing result and expriment proves that the purposed deformation analysis method can solve the problem for ATWS automated riveting efficiently.
A Radar Target Recognition Method Based on Nonparametric Feature Analysis and Backward Cloud Model
Authors: Wu Jie , He Jun , Zhou Jian Jiang
Published: December 2012

When applying Parameter Discriminant Analysis (PDA) in extracting features of radar target High-Resolution Range Profile (HRRP), the construction of scatter matrices relies on the assumption that HRRPs in all classes satisfy the Gaussian distribution with the same covariance matrix. However, the distribution of HRRP is actually complex. In order to tackle this problem, a radar target recognition approach based on nonparametric feature analysis and back cloud model is proposed in this paper. Compared with PDA, nonparametric feature analysis (NFA) estimates the contribution of the K nearest neighbors (KNN) points to calculate the between-class scatter matrix. NFA makes use of class boundary information and relaxes the requirement of Gaussian distribution assumption in PDA. Moreover, back cloud model better describes the complex distribution of the HRRP NFA subspace due to the representation of signal’s randomness and fuzziness. Simulation results based on a HRRP dataset of five aircraft models demonstrate the effectiveness of the proposed approach.
Failure and Failure Mechanisms Analysis of High-Speed Punch
Authors: Zhang Xin Zhou , Sun Yu , Peng Bin Bin , Hu Feng Feng
Published: December 2012

According to the main characteristics and functions of a high-speed punch, the system was divided into nine function subsystems systematically. Based on failure data, the failure positions, failure mode, failure causes and failure cause classification were detailed statistical analyzed. And the weakest links and potential shortcomings of the high-speed punch were pointed out. Some failure mechanisms of the high-speed punch, such as oil/gas leakage, crankshaft failure and so on, were analyzed especially. The improvement measures, which lay the foundation for the reliability growing of the high-speed punch, were drawn based on the failure and failure mechanisms analysis.
Fault Diagnosis of Condenser in Ship Steam Power System Based on Unsupervised Learning Neural Network
Authors: Yu Rui , Xiang Rui , Ke Zhi Wu , Yao Shi Wei , Wan Xin
Published: December 2012

A diagnostic method is proposed for the faults of the condenser in the ship steam power system by using the unsupervised learning neural network. First, we analyzed the reasons leading to the condenser faults according to the operating features of the condenser in the steam power system. Combined with the expert knowledge, we summed up the training sample model for the fault diagnosis of the condenser. Then we adopted two types of unsupervised learning neural network to diagnose the fault of the condenser. The diagnostic method was proved to be rapid and accurate by test. Finally, we analyzed and compared the performance and the optimizing approach of the unsupervised learning neural network for fault diagnosis. The diagnostic method is of guiding significance for the safe operation of the ship steam power system.
PNN and GRNN Approach for Fault Diagnosis of Steam Turbine
Authors: Yu Rui , Ke Zhi Wu , Li Xian Ling , Zhang Ke Long , Wan Xin
Published: December 2012

The artificial neural networks have received wide research efforts in fault diagnostics in recent years. This study proposes two types of feedforward neural networks (PNN and GRNN) for diagnosing the fault of the steam turbine. The eigenvectors of the vibration signals in steam turbine can be extracted by the time-domain analysis after the wavelet packet decomposition and reconstruction. Depending on these eigenvectors, we developed the fault diagnosis program with the PNN and GRNN approach for the steam turbine in Matlab, and diagnosed two common faults of steam turbine (mass unbalance and oil whirl). The diagnostic accuracy is up to 94.44%, and the diagnostic time is short. The results demonstrate that the diagnostic approach is able to identify the common faults of steam turbine quickly and efficiently.
Realization of Serial Port Expansion Circuit
Authors: Zhao Xue Mei
Published: December 2012

This article describes the design of a interface chip with serial port expansion circuit of computer in industrial applications. It is used to connect with 422 and RS232 interfaces. Circuits involved several major chip such as the interface of 422 and RS232 and UART(Universal Asynchronous Receiver Transmitter)16C550 Inside the computer. Paper describes the composition of the hardware circuit, theory and implementation and initialization programming of URAT interface chip. We use interface chip with the FIFO to the circuit, It improves the efficiency of the application software, And it solves the problem of insufficient of computer serial port.
Realization of Target Position Changing On-The-Fly for Intelligent Motion Control Applications
Authors: Lai Yi Zong , Ye Feng , Chen Wei Na
Published: December 2012

This paper presents an algorithm of S-curve profile velocity planning with prediction of deceleration distance dynamically, extended functions including target position or target speed change on-the-fly, motion pausing and resuming are addressed. The algorithm is implemented for high performance multiple axes motion controller where complex paths must be employed for each axis to obtain smooth acceleration, speed, position shapes and target position or speed will be changed during moving to meet the requirement of processing. Application that requires the ability to change the endpoint or moving speed without completing the previous move are applied in varied industrial equipment such as SMT, AOI, product lines, etc.
Realization on Multi-Agent Intelligent Decision Support System Based on Blackboard
Authors: Sun Yong Yong
Published: December 2012

The majority of work is completed by collaboration of various components in a particular group environment, and the architecture of Multi-Agent Intelligent Decision Support System based on blackboard is designed using blackboard system and Agent. At the same time, implementation technique on Agent in system is provided, that includes abstract structure of Agent and modeling of Agent action. In addition to, mechanism of breakdown the task on blackboard control Agent is described. The system is helpful to resolve the complicated works though Multi-Agent.
Realizing Method and Application of Theoretically Relative Symmetry Zero Error for Two Coupling Components Based on Error Compensation
Authors: Zhou Zong Zhi , Gu Li Zhi , She Wen Zhi
Published: December 2012

Mechanical systems often require the symmetry of the two assembly components. This paper presents a method for theoretical zero-symmetry error of the mating components in batch production. The method is based on symmetry principle of error compensation and sequential positioning of the two mating components, realizing the coincidence of the symmetrical lines between the two components, regardless the manufacturing errors of the two components. The method is suitable for processing positioning and assembly positioning precision requirements and multiple components of symmetry occasions.
Research on Driving System of Battery Machinery Based on PID Controlling
Authors: Li Chun Hui , Kang Shao Hua , Wu Tie Zhuang
Published: December 2012

In order to improve the dynamic characteristics and stabliness of control system battery machinery, speed regulating controller uses an improved incremental digital PID.PID parameters is followed the dominant pole theory and the second-order best theory. The simulation of DC electromotor is rapid dynamic response, stability, the smaller overshoot. The experiment proves that battery machinery can work stably and reliably. Therefore, the PID control algorithm of machinery truck driving system is feasible.
Research on Fault Diagnosis for Power Transmission Based on Mass Data Mining
Authors: Sun Xiao Yan , Li Long , Liu Ping Ping
Published: December 2012

A Multi-Agent based transmission fault diagnosis system is researched in this paper. Many data digging analysis methods are employed, combined with data warehouse, OLAP and Multi-Agent technology. An intelligent decision supporting system for monitoring transmission network data is built. Data digging method is used to intelligently analyze and process fault data in the data warehouse, and Agent technology is used to realize data collection, pretreatment, inquiry, knowledge Automatic extraction, mining and other functions, which makes the whole mining process intellectual and intelligent. It aids transmission management with decision-making, thus to make the monitoring and repair of power grid fault more timely and accurate.
Review: Numerical Simulation in Wood Plastic Composite Extrusion
Authors: Yuan Lei , Chen Zuo Bing
Published: December 2012

This paper first introduces the latest application of numerical modeling method in polymer processing, and then discusses the related research problems and the main open issues. Finally, requirements and prospects are proposed for the realization of the development direction of Wood–fiber/Plastic Composites (WPCs).
Research on the Practicability of Applying Long-Range Identification and Tracking System to Ships’ Safe Operation
Authors: Zhang An Xi , Zhou Zhao Xin
Published: December 2012

Safe operation is the basic condition of shipping. Long-range identification and tracking system is an important measure for maritime security. If applied as referred in the SOLAS convention, long-range identification and tracking system will play an active role. Through research on the system's background, composition, function and coordination with other equipment, it is expected to play its better role in safety operation and provide reference for its practitioners.