bluuebunny/crossref_metadata_2025 huggingface dataset:
Optimization of Underwater Body's Shape
Authors: Zhang De Xin , An Wei Guang , Fan Zuo Xiang , Liu Lei
Published: July 2011

In order to make the resistance underwater as small as possible, the shape of cavitator has been studied, and supercavitation resistance and drag reduction which related to the foreign experimental results is discussed. In this paper, first the super-cavity underwater body shape is optimized. we analyzed the super-cavity flow model and has gain cavity's radius function in the optimization, then use the path of least resistance, which result in Mathematical modeling with the largest cavity volume by the double goals of optimizing, and the constraints are given.
The Green's Function and its Oscillatory Properties for a Single Branch Structure of a Pinned Beam-Rod System
Authors: He Min , Wang Qi Shen
Published: July 2011

This paper concerns the determination of qualitative properties of linear vibrational systems, in particular for a single branch structure consisting of a pinned beam-rod system. First, we establish the characteristic equations satisfied by the Green’s function for this structure. The Green’s functions corresponding to support conditions where the left end of the beam was pinned-end are deduced by adopting the direct integral method. Using the theory of oscillation kernels established by Gantmakher and Krein, oscillatory properties of the Green's function for the beam-rod system are proved. Furthermore, four oscillation properties associated with frequencies and mode functions for the system are given.
Factorial Hidden Markov Model Recognition Method Based on Multi-Channel Information Fusion
Authors: Li Zhi Nong , Wu Guan Hua , Jiang Jing , Feng Fu Zhou
Published: July 2011

Combining Self-organizing Feature Map (SOM) and Factorial hidden Markov model (FHMM), a new FHMM fault recognition method based on multi-sensor vibration information fusion is proposed. In the proposed method, the SOM neural network is used to reduce the information redundancy in feature vectors extracted from the multi-sensor’s vibration measurements, FHMM as a classifier. The fault recognition in the speed-up and speed-down process of rotating machinery was successfully completed. The experiment result shows that the proposed method is very effective.
Progress of the Study on the Material and Technology of Heat Insulating Coating
Authors: Wu Qiang , Ma Su Yang , Zhou Yi Dan
Published: July 2011

The research progress of the study on the material and technology of heat insulating coating was introduced. Parts of the research work were enumerated. The development trend of them was looked forward.
A Numerical Analysis of Infilling-Wall Multi-Functional Vibration Reduction
Authors: Zheng Jun Wei , He Ming Sheng , Shi Gui Ju
Published: July 2011

Based on the experimental study, this paper analyzes the stress given by series of Structured Infilling-walls reducing vibration multi-functionally in the help of the finite element analysis software, ANSYS. It is a comprehensive comparative analysis that different structures, thickness of walls, storeys, and spans are included. The conclusion is drawn that filling-wall can improve the mechanical properties of multi-functional vibration-reducing structure of infilling-wall, which provides theoretical evidence for infilling wall multi-functional vibration-reducing structure under different circumstances that the infill wall stand the proportion provides certain theoretical basis. The appropriate brittle anti-pressure pieces can be fixed according to the comparative finding which also contributes a lot to the achievement of the purpose of this project.
Vibration and Noise Monitoring of Ceramic Motorized Spindles
Authors: Zhang Li Xiu , Wu Yu Hou
Published: July 2011

High speed machining (HSM) technology is used in a broad range of applications to machine ferrous metals and nonmetallic material. The motorized spindle is one of the major elements to keep the machine running at high productivity. In recently years, the requirement of rotational speed and rigidity of motorized spindle is getting higher and higher in order to satisfy the high speed processing. Engineering ceramic is the ideal material for high-speed and high precision electrical spindle due to perfect characteristics of light weight, wear resistance, high temperature, high strength, and so on. So a ceramic motorized spindle is designed for higher speed and rigidity. The shaft and bearing of the motorized spindle are made from ceramic material and other parts are made from metal. Rated power of this electrical spindle is 15Kw; its torque is 14Nm and revolving speed is up to 30,000 rpm as maximum. Motorized spindle is a typical mechatronics product and its dynamic property is very important. The signal of vibration and noise of motorized spindle may display its running status, so the vibration and noise of motorized spindle is an important index in the dynamic performance. This paper monitors the vibration and noise of ceramic motorized spindles using spectral analysis techniques. The effects of rotating speed and lubrication condition on vibration and noise of the ceramic electrical spindle are analyzed. These results are very helpful to the structure optimization and application of the ceramic motorized spindle.
A Study of the Screening Efficiency of a Probability Sieve Based on Higher-Order Spectrum Analysis and Support Vector Machines
Authors: Shi Zheng Zhong , Huang Yi Jian
Published: July 2011

Aiming at drawbacks of current methods for predicting the screening efficiency of probability sieve, this paper proposed a method of predict and study the screening efficiency of probability sieve based on higher-order spectrum(HOS) analysis and support vector machines(SVMs). First setting up trispectrum model with the vibration signals, then fitting out polynomial with least square method using the data which get out by the reconstruct power spectrum. Finaly, using support vector machines to predicting the screening efficiency with the coefficient of the polynomial as the sample input. The results show that the relative errors are all less than 2.4% and the absolute errors are all less than 0.021, which is ideal for efficiency forecast.
Study on Trispectrum Slices for the Magnetorheological Damper
Authors: Gao Yu , Huang Yi Jian
Published: July 2011

Time series AR models (AutoRegressive models) are established with the use of the colored noise filtered by vibration signals,so as to study vibration characteristics of the magnetorheological damper under different working currents and frequencies .Because vibration signals are non-stationary and nonlinear , signal processing tool of trispectrum is introduced.The trispectrum are utilized for analyzing dynamic frequency characteristics of the magnetorheological damper. The result shows that the trispectrum slices can quantificationally describe nonlinear coupling, restrain gaussian noise and reserve phase components. Characteristics of the trispectrum is closely related to the current and frequency .The trispectrum slices can be used to describe laws of vibration system effectively.
Modal Analysis of Water-Lubricated Rubber Stern Bearing Based on ANSYS
Authors: Jin Yong , Lan Fang
Published: July 2011

With the popularity of the water lubricated rubber stern bearing, researches around rubber bearings are becoming more and more popular in recent years. This paper built a 3D numerical model of water-lubricated rubber stern bearing and did both free boundary and constraint modal analysis using finite element software ANSYS. The results show that free modes of water-lubricated rubber stern bearing are correlating with the constraint modes. The natural frequency distributes intensely in low frequency and the modal shapes mainly focus in the inner lining. Along with mode order increased, the mode shapes become more complicated. The mode shapes mainly embodies in the inner lining.
Combination of Wave Atoms Shrinkage with Bilateral Filtering for Oscillatory Textural Image Denoising
Authors: Ma Yue Mei , Liu Guo Jun
Published: July 2011

Oscillatory textures are not only ubiquitous in natural images, but also in some inverse imaging problems involving oscillatory date, such as seismic databases, fingerprint images, et al. In this paper, we propose a three-step denoising scheme for for oscillatory textural images by combining bilateral filtering in spacial domain with wave atoms shrinkage method in transformed domain. That is, we first pre-process noisy image with bilateral filtering, then to process image with wave atoms shrinkage, finally post-process image with bilateral filtering again. Above all, we offer a reasonable interpretation of proposed method from the point of nonlinear diffusion filtering. Numerical experiments illustrate the good performance in comparison to the wave atoms shrinkage method and the bilateral filtering method by using two measures: peak signal-to-noise ratio (PSNR) and structural similarity (SSIM).
Numerical and Experimental Studies on Aerodynamic Characteristics of Pneumatic Exhaust with Perforated Panel Muffler
Authors: Li Jing Xiang , Zhao Sheng Dun , Ishihara Kunihiko , Shi Hu Shan
Published: July 2011

The expansion chamber mufflers compounding with the perforated panels are commonly used in the suppression of intermittent exhaust noise (IEN) generated by the exhaust air from the cylinder and ducts of pneumatic devices. The flow resistance and noise reduction performances of IEN are both important. A simplified aerodynamic model is presented to study the flow characteristics in the pneumatic cylinder and chambers of the muffler with perforated panels. The relationship between pressure and mass flow rate is established in the transient exhaust process. Validation experiments measuring the cylinder pressure and exhaust noise of the pneumatic friction clutch and brake (PFC/B) exhaust system installed a three-level perforated panel muffler which can be separated show that the calculated results are very close to that of the actual exhaust process.
The Effect of Anisotropy of Medium on the Stress State around a Borehole
Authors: Jiao Yong Shu , Fan Mu Hui , Li Li Juan , Cai Zong Xi
Published: July 2011

Based on the analytical solution for the stress field around an inclined borehole in an anisotropic medium, a computer program was developed and a serial parametric study was conducted. The effects of parameters such as degree of anisotropy, borehole inclination, bedding plane inclination and in-situ stress conditions on the stress distribution around a borehole were evaluated. The results showed that medium anisotropy has little effect on borehole fracture analysis at low borehole inclinations, but its influence becomes significant for highly inclined boreholes. As the degree of anisotropy varies the maximum shear stress changes remarkably. This indicates that the degree of anisotropy plays a role in the collapse failure of a borehole. The information generated in these studies can be used in predicting the fracture or collapse-initiating pressures.
Based the GM Reliability on the Application of Mechanical Product Evaluation
Authors: Qian Song Rong
Published: July 2011

This paper is based on the gray model reliability theory that established system information incomplete state reliability comprehensive analysis method. Through the gray model reliability that can complete system, forecast, assessment information processing methods, mechanical system for internal and external rules, foresee the future development of the mechanical system and realize speed selection evaluation of mechanical products.
An Approach to Fatigue Reliability Analysis Based on the Hybrid Model of Probability and Non-Probability
Authors: An Hai , An Wei Guang
Published: July 2011

This paper proposed an approach to fatigue reliability analysis based on the hybrid model of probability and non-probability. Due to the compatibility of measures between probability reliability models and non-probability reliability models, a hybrid model of the safety margin equation that contains random variables and interval variables in the structure system is firstly structured to analyze fatigue reliability of system by adopting the “stress-strength” theory. Then, AFOSM method and the method of interval mathematics are employed to solve the interval of the fatigue reliability index. Finally, a numerical example is given to present the application of the approach in practice.
Reducing Surface Defects of CrXOY Film in Mid-Frequency Dual-Magnetron Sputtering
Authors: Yu Xiang , Ma Lei , Liu Yang , Yang Zhong Zhou , Meng Hua
Published: July 2011

Influence of the process parameters of a reactive mid-frequency dual-magnetron sputtering on surface defects of CrxOy film was investigated. The forming mechanisms of the observed droplets and craters were analyzed. The optimal parameter combination for accomplishing fewer surface defects was explored; and the optimized process parameters evidently minimized the surface defects of the film. In the condition of the target current of 16 A, the gases pressure of 0.31 Pa, and the bias voltages in a range of -120~-240 V, an optimized CrxOy film has been synthesized with surface defect density low to 78 defect/mm-2.
Study on the Preparation and Property of the Ceramic Film on the LY12 Aluminium Alloy
Authors: Chen Xiao Wen , Zhang De Fen
Published: July 2011

The ceramic thin film on the surface of LY12 aluminum alloy were prepared by the method of the microarc oxidation. The appearance of film was observed by stereoscopic microscope, the thickness of film was tested used thickness tester and the corrosion resisting property of sample in solution of 3.5% NaCl was measured by potentiostatic method. The results show that the tightness of film is best when used 8A/ dm2for micro-arc oxidation, the hardness is increased with the increase of current density. The corrosion resisting property of ceramic film in solution of 3.5% NaCl used different current density is different, the corrosion resisting property of ceramic film is first increased and then decreased with the increase of current density, the corrosion resisting property of ceramic film prepared with the current density of 8A/ dm2is best.
Web-Aided Design for Dimensioning Power Cables
Authors: Zhai Qing Zhi , Yang Jian Hua , Chen Yang
Published: July 2011

The size selection of cables is not only to avoid the excessive heating and the danger of fire, but also to insure the service and the reliability of the concerned electric circuit. In the context of the dimension of the cables, some standards should be observed and necessary calculations should be done. With the requirement of the worldwide expansion application on Internet, the approach and the architecture of a complete Web-aided design platform are proposed for dimensioning the cables. The platform supports some calculation methods which are necessary for selecting the cables. Both XML documents and databases are used to interchange power system data and calculation results between Web servers and clients.
Properties of Pulse Plating Ni-SiC Nano-Composite Coating
Authors: Zhang Ji Qun , Jin Hui Ming , Gao Ji Cheng , Shi Jun , Li Lu
Published: July 2011

A Ni-SiC nano-composite plating coating was prepared by using composite plating technology adding nano-SiC in the bath.Then the surface morphology was examined by scanning electron microscope (SEM), the transmission electron microscope (TEM) was used to study the grain size,the porosity, corrode-resistant, combines intensity and wearability of the composite plating coating were also tested and contrasted the result with the pure nickel coating. The results shows the surface of Ni-SiC composite coating are more uniform and compact for the adding of nano-Sic refined the grain, the wear resistance,microhardness and corrosion resistance of the composite coating are also significantly improved.
Structure Optimization Design of Drum of High-Speed Tire Test-Bed
Authors: Li Shi Wu , Tian Jing Jing , Yang Zhi Fa , Wang Hai Zheng , Chen Lu
Published: July 2011

In order to study the effect of tire operating mode on its safety performance, a high-speed tire test-bed was put forward. The dynamic characteristic of drum was important for test result. To avoid the resonance of loaded drum during operation, the topological optimization analysis of drum with I-shaped structure was fulfilled with the element density as variables and the volume reduction of fifty percent as constraint condition and the first natural frequency as objective function. The optimal density distribution of drum was obtained within the constraint of the first natural frequency. Based on the analysis result of topology optimization, the drum structure with I–shaped was modified. The structure size of the new and improved drum was optimized with 50 iterative calculations using ANSYS. On the condition that the first natural frequency of drum was over 60Hz, the structure size of drum was optimal when the rate of the first natural frequency and total weight was highest and equaled to 0.05391. The optimization results showed the first natural frequency of drum was raised by 21.972Hz and its total weight was reduced by 69.95Kg.
Study on Fengdu Second Yangtze River Bridge the Cable Anchorage Structure in a Girder Transfer Mechanism
Authors: Zhang Xie Dong , Wang Jin Zhi , Wang Xiao Dong
Published: July 2011

The cable anchorage region in a girder is the key part of cable stayed bridge， in which stress distribution is rather complicated. A general plane analysis method is hard to reflect actual stress status. According to the design of Fengdu Second Yangtze River Bridge In this paper, the analysis of the spatial stress distribution of the cable anchorage structure in a girder is carried out in design load by making use of the common analysis software-Midas FEA and spatial finite element method, the verification and assessment of Fengdu Second Yangtze River Bridge Anchor Plate rational structural design is conducted, in order to put forward optimize the design suggestions, to ensure that such structures the realization of economy and reliability.
Retrieval Algorithm of Images and its Applications in Recognition of Metallographic Pictures
Authors: Ling Ling , Ling Wei Xin
Published: July 2011

In order to improve the retrieval speed and precision of images, the improved algorithm of extraction of image color features based on the both RGB and HSV color models was proposed in this paper. The algorithm can remove the repetitious vectors of compost in quantization process. While evenly quantizing model space, we can bring the compression of dimensions of image color features into full play and guarantee not to lose the main components of color features for color image. Then using RBF neural network and incorporating the values of color features, the image retrieval can be performed. The experimental results show that the data model of image color features in precise and high effective terms can be established and described by this algorithm, and the satisfactory results are obtained by applying the algorithm to the recognition of metallographic pictures for metallic materials. In addition, the algorithm can also be used in the evaluation of the discoloration of metallic casting alloys.
Coal Face "Three-Machine" Selection and Matching Knowledge Modeling Based on Ontology
Authors: Zeng Qing Liang , Wang Xi Wei , Wan Li Rong , Liu Zhi Hai , Wang Yuan Jun
Published: July 2011

The successful matchings of the coal face equipments can fully play the effect of complete sets of equipments and achieve high yields and efficiency on coal faces .in this paper, ontology is used in the "three-machine"selection and matching knowledge modeling, which adopts the thought of combination on lateral and vertical modelings, and reuses the semantic body technology according to the characteristics of "three-machine" knowledge. As a result, the efficiency of ontology construction is improved largely and ontology structuration and standardization are strengthened. The ontology not only provides the exact knowledge representations, but also achieves knowledge reasoning and queries based on users to realize knowledge sharing and reusing. It provides a technical support for optimal matchings on" three-machine".
Motion Error Analysis of Planar Optical Waveguide Automatic Aligning and Coupling Platform
Authors: Tang Hao , Zheng Yu , Duan Ji An
Published: July 2011

Aiming at problems of planar optical waveguide aligning and coupling multi-dimensional space sub-micron motion error, with using topology theory, estimating distribution of motion error paramount precisely, this paper establishes position model of precise motion platform, based on Monte Carlo method, obtains precise position distribution of fiber end point. The result indicated that this method can obtain accurate position in the adjust process of planar optical waveguide automatic aligning and coupling, and achieve effective control of aligning and coupling accuracy.
Research on Ship Parts Nesting with Immune Ant Colony Algorithm
Authors: Zhong Xiang Qiang , Liang Li Dong
Published: July 2011

A kind of method with immune ant colony algorithm (IACA) was applied for ship parts nesting problems. Graphics coding and pretreatment method of ship parts were proposed. A method of combination and filling transformed ship parts nesting problem into orthogonal rectangular nesting problem. An automatic nesting system was realized by use of remaining rectangular matching method and orthogonal approach grafting algorithm. A specific example was given according to the proposed algorithm, the nesting results prove that it is feasible for ship parts optimization nesting problem with IACA.
Design and Simulation of the Torsion-Free-Body between the Vehicle Oil Can and the Chassis
Authors: Chen Jun , Zuo Yong Gang , Yang Jing
Published: July 2011

The movability and safety of an oil can vehicle is influenced greatly by the effect of the fixation between the chassis and the vehicle oil can. The butt-joint technology of the chassis and the vehicle oil can is studied in this article, and a new torsion-free-body is designed. The 3D model of the torsion-free-body is built in Pro/E, and the kinetics analysis of the complex stress point of the torsion-free-body is done in ADAMS, which can provide theoretic guidance for designer to optimize structure design.
FEM Analyses on Stress and Deformation of a C-Type Expansion Bolt
Authors: Chen Zhong He , Wang Wei Qiang , Zhang Ming , Dong Ning Ning
Published: July 2011

The C-type expansion bolt is a new kind and new structural bolt. It has superior compatibility to the soft rock and the big distorted tunnel. In order to study its stress, deformation and interaction mechanism, large distortion calculations and analyses have been carried out on the bolt by FEM (finite element method), especially with the ANSYS software, based on the updated Lagrangian law. The results show that the maximum stress and deformation of the section and body of the bolt meets the anchoring requirements. The bolt meets the required anchoring performance and anti-drawing performance. The paper provides some basis for its design, application and anchoring stress analysis.
Dynamic Characteristics Analysis of High Water-Based Large Flow Safety Valve
Authors: Zhang Jian Li , Li Da Lei , Ma Sheng Gang , Wang Yong Qiang , Fu Pan Di
Published: July 2011

The FAD3000/50 safety valve is researched that is newly developed by Zhengzhou Coal Mining Machinery Group Co.,Ltd with high water-based pressure ultra great current capacity. The mathematical model is fistly established according to the study of its structure and the practical system on hydraulic support. The simulation computation has carried under the MATLAB software, and this simulation model has confirmed through the test result. After a comparison of multiple sets of simulation results, the influence of primary structure parameter’s change in safety valve to dynamic characteristics is gived.
Symmetric Beauty: Press Based on Reconfigurable Toggle Mechanism Driven by Pneumatic Muscle
Authors: Qin Pei Liang , Zhong Kang Min
Published: July 2011

In this paper, two different diameter pneumatic muscle, combined with reconfigurable toggle mechanism, three kinds of press has been innovated, the working principle of the press are introduced, its calculating formulae of output power are also given,and the force amplifier coefficient were compared. The large-diameter pneumatic muscle will be used for the working stroke of the pressure travel, while the small-diameter pneumatic muscle will be used for the return travel.The press can satisfy the requirement of different output force and different structure size, no pollution, adapted to the greening trend, there is broad application prospects.
Optimization of Parameters for Children’s T-Shirt Neckline
Authors: Xu Li Ping , Miao Ming Zhu
Published: July 2011

This study is an attempt to optimize the parameters for the neckline of children’s T-shirts. Experiments are made with six different kinds of knitted fabrics to analyse the relationships between fabric performance, sewing conditions and the neckline elongation of T-shirts. The result shows that there is a high correlation between course density, wale density, linear density, and T-shirt neckline. A multivariate regression analysis results in the establishment of a mathematical model, through which the neckline elongation can be obtained without sample trials so that the parameters for children’s T-shirt neckline are optimized and the design process simplified.
Innovative Design for Supply Mode of Steam in Drying Cylinder
Authors: Li Rui Hu , Yuan Yue Ding , Chen Hai Feng , Yuan Yue Jin , Ma Ming
Published: July 2011

This paper analyzed the dynamic state of the water ring, which is formed through the exothermic process of steam condensation, and its influence on heat transfer during the operating process of the high speed paper machine’s drying cylinder. The influence of perturbation on the flow condition of the water ring was also discussed. This information was used to design the steam-knife gas supply system in the drying cylinder. This system provides a so-called steam-knife to attack the water ring, which would change the dynamic state of the water ring’s fluid level. This would ultimately improve the heat transfer efficiency.
Study on Layered Fracturing String for Deep Compact Gas Reservoirs
Authors: Xu De Kui , Gao Fei
Published: July 2011

The outskirts oilfields of Daqing Oilfield have characteristics of deep volcanic reservoirs, compact and complex lithology, and low natural yield of single gas well, so it is necessary to fracture these outskirts oilfields for exploitation. The traditional layer-by-layer fracturing gas test technique has low construction efficiency and poor reconstruction effect. Considering physical properties of compact gas reservoirs, conditions of wells and indexes of downwell tools, this paper studies and designs a layered fracturing string for deep compact gas reservoirs. It comprises high-index fracturing packer and matching downwell tools. The high-pressure compact gas reservoirs can be reconstructed layer by layer and on a large scale without moving string. The field construction shows that this string can meet requirements of formation temperature 180°C and working pressure 100MPa, and it can finish maximum 130m3 layered constructions thereby significantly reducing the field construction.
Popular Evolution and Styles Reusability of Platform Shoes
Authors: Peng Wen Li , Tan Juan Juan , Zhang Wen Ni
Published: July 2011

The origins and popular history and current status of platform shoes were introduced. The cycle and causes of its prevalence evolution were discussed. Customer demand characteristics, functional characteristics, modeling features and style characteristics of platform shoes were refined and studied, which laid the foundation for style reusing. The prevalence trend of platform shoes was predicted.
The Optimization of Flexible Job Shop Scheduling Problem Based on Improved Dual Coding Non-Dominated Sorting Genetic Algorithm
Authors: Ju Lu Yan , Yang Jian Jun , Liu Bao Ye
Published: July 2011

In order to optimize the multi-objective flexible job shop scheduling problem (FJSP) roundly, multi-objective mathematical model is established, including makespan, maximal workload, total workload and total tardiness. In this paper a dual coding method which takes operation arrangement and machine selection into account is employed, and designed new crossover and mutation methods, the infeasible solutions are avoided. In order to deal with the multi-objective optimization problem, a new non-dominated sorting method is introduced, which can get the Pareto optimal solutions quickly and correctly by dividing the whole population into three parts. Example shows that the algorithm is efficient.
APDL-Based Optimization of the Boom of Luffing Jib Tower Cranes
Authors: Wang Ji Yong , Li Lei , Song Shi Jun , Hao Long Long
Published: July 2011

Tower cranes are made of steel structure, which account for more than half of their weights. Therefore, steel structre optimization of tower cranes is important for the development of design technology of tower cranes. This paper develops a systemic optimization method for tower cranes based on Ansys OPT, combined with finite element analysis (FEA) and stability theory. This mathod is firstly used in the optimization of the boom of luffing jib tower cranes. New optimization model of the boom of luffing jib tower cranes is introduced and the corresponding optimization program is developed. The integration of the calibrating of overall stability and single-limb stability of luffing jib tower cranes, FEA and OPT is realized by extracting some parametes from FEA results, such as weight and axial force. Rapid optimization of the boom of luffing jib tower cranes is realized by the parametrization of non-design variables. Direct reading of optimization results is realized by the discretization of design variables. Finally, the boom of a tower crane with movable arm is optimized with the optimization program to demonstrate the effectiveness and superiority of the optimization method.
Optimization of Earth Observation Satellite System Based on Design of Experiment and Surrogate Model
Authors: Liu Xiao Lu , Chen Ying Guo , Chen Ying Wu
Published: July 2011

Earth observation satellite system (EOSS) is the main space platform collecting ground information. Optimization of EOSS is difficult, as it is a complex system referring a great deal of design variables and uncertain factors. Therefore, an optimization framework based on design of experiment and surrogate model is proposed. Design of experiment is used to generate simulation plan, which will greatly cut down cost of simulation. Then surrogate model is built to analyze simulation data and approximate real EOSS. Genetic algorithm and improved general pattern search method are adopted to solve the model. According to the framework, a case study is carried out. The final results illustrate the framework is useful and effective for the problem of EOSS optimization.
The Lag Comparator of the Two-State Modulation Technology to the Development of a New Type of Dynamic Electronic Load
Authors: Zhao Xu Cheng , Wang Yu Kui , Hu En Yong
Published: July 2011

This paper described how to apply the lag comparator of the two-state modulation circuit to the development of the current-controlled two-state modulation technology which, under the control of a micro-computer, is used to a new type of dynamic electronic load of power supply for the detector of the starting property and capability of the battery for aircraft. Based on the quantitative analysis of the lag comparator of the two-state modulation circuit, the inclusion is drawn that the system is an excellent dynamic electronic load and controlled current amplifier. The result and curves of the detection and imitation detection of batteries are given in the paper.
Digital Control Hydraulic Variable Pump Based on Mechatronic-Hydraulic-Air Integration Driven by Compressed Air
Authors: Sheng Xiao Ming
Published: July 2011

This paper introduces digital control hydraulic variable pump based on mechatronic-hydraulic- air integration driven by compressed air. By inserting the toggle force amplifier in between double-acting rodless air cylinder and variable pump, this pump, driven by compressed air, utilizes small forced air to create big output power. The displacement of air cylinder piston is measured by using digitally linear displacement sensor and it is compared with input signal by computer in order to control pressure and flow rate output by hydraulic cylinder. This pump provides high flexibility and high reliability, simple structure and compact; it is easier to control by artificial intelligence and it will be widely used in the industry.
Energy Efficient Rout Algorithm Based on Ant
Authors: Lin Zuan Hui , Wang Wei Xing , Lu Jian Qiang
Published: July 2011

Wireless sensors network has been widely used in a real-time monitor, percept or gather physical information such as light, temperature, humidity, noise or Concentration of harmful gas. With its simple and efficient characteristics, Ant colony algorithm has been widely used in WSN rout. An energy efficient rout algorithm based on ant was shown in this article, in which an energy-related descending parameter was used. The improved algorithm avoids excessive repetition use in the network link, in order to use the network energy effectively, and at the same time transmission rate is also guaranteed.
A Simple Calibration Method for the Relationship of the Eye-in-Hand of Robot Vision
Authors: Zhang Xue Min , Song Shu Wen , Pan Qing Jun
Published: July 2011

The space relationships among flange coordinate, camera coordinate and calibration reference coordinate are analyzed. A simple calibration method for the relationship of the eye-in-hand of robot vision is proposed and corresponding experiment system is designed. The result of experiments shows that this method can work simple and shortcut with higher precision.
Research on Algorithm of Detection of Weld Image Edge Based on Lines Positioning Theory
Authors: Li Jun , Huo Ping , Li Xiang Yang , Jia Jing Bo
Published: July 2011

To solve the difficulty in processing the weld image of multi-threshold and small size using the traditional image processing algorithms, image preprocessing has been optimized combining with the traditional mode of image processing. The maximum distance location algorithm and the line grey location algorithm have been designed on the basis of lines position combining with the specific characteristics of the weld image. These two algorithms are applied to process the weld image of multi-threshold and small size. Finally the wrong values of the weld images are removed according to the Pauta rule, thus achieving a linear correction of the edge. This paper introduces the basic ideas and the implementation methods of the two positioning algorithms in details. The experimental results show that the two algorithms can effectively resistant the interferences of noise, have a high precision positioning, and retain edge images with better detail characteristics.
Computerized Simulation on Energy Saving Characteristics of Variable Displacement of Double Action Vane Pump
Authors: Chen Lei , Zhang Pan
Published: July 2011

Based on the study of a patent, the configuration and action principle of a new variable displacement of double-action vane pump is discussed. The pump is equipped with floating blocks that may move up and down in accordance with the rotational speed of the pump. The pump belongs to an automotive hydraulic power steering system. The mathematical and simulation model for the hydraulic power steering of an automobile was established. Different pump parameters were selected for simulation. The simulation results showed that the pump with the floating block can provide power characteristics are better than a common pump. The utilization of the proposed pump is expected to improve efficiency and decrease exhaust gas and noise.
Research and Development of Embedded CNC System for Drilling Based on ARM
Authors: Wang Bang Fu
Published: July 2011

Based on the in-depth study of embedded systems technology and characteristics of the ultrasonic vibration drilling process, the new CNC system for ultrasonic vibration drilling based on ARM and μC / OS-II embedded was proposed in this paper. For this system, the kernel of hardware is the 32 -bit embedded CPU LPC2210 with characteristics of high performance and low power consumption. And it is also equipped with the required peripheral modules to extend itself to one whole hardware system and the interface circuit. Its software is based on μC / OS -II real -time embedded operating system, and the required application software needs to be developed so as to turn μC / OS- II real -time embedded operating system into one practical embedded ultrasonic CNC drilling.
Based on Synchronized Timed Petri Nets for Emergency Vehicle Preemption Systems
Authors: Huang Yi Sheng , Weng Yi Shun
Published: July 2011

Timed Petri net (TPN) has been utilized as a visual formalism for the modeling of complex discrete event dynamic systems. It illuminates the features on describing properties of causality and concurrency. Moreover, it is well-known that synchronized timed Petri net (STPN) allows us to present all of the concurrent states in complex TPN. In this paper, we propose a new methodology to design, analyze and implement an urban emergency vehicle preemption control system by using STPN. The applications of STPN to two-phase traffic lights and emergency vehicle preemption are illustrated. The advantage of the proposed approach is the clear presentation of traffic lights’ behaviors in terms of conditions and events that cause the preemption phases alternations. Finally, a two-phase traffic lights control system with emergency vehicle preemption will be realized by using STPN. To our knowledge, this is the first work that employs STPN to model a two-phase traffic lights control system with emergency vehicle preemption system.
A Novel Transformer Fault Diagnosis Method Based on Gross Error Examination
Authors: Su Jie , Wang Xu Guang
Published: July 2011

The study applied the gross error theory to the transformer fault diagnosis, proposing a method for transformer fault diagnosis by integrating the gross error examination and the characteristic gas ratio method. In this way it is possible to judge whether the transformer is in face of an incipient fault by examining the gross errors of the measurement series of the fault characteristic gases, at the same time the fault probability could be calculated according to the remarkable level. And then in combination with the characteristic gas ratio method, the fault category and fault cause of the transformer could be figured out. The method has been validated by an actual example of fault diagnosis.
Research on the Heat Exchange Performance of Thermal Insulation Material and Cooling Pipe for Concrete Dam
Authors: Zhang Yang , Qiang Sheng
Published: July 2011

In the mass concrete structure construction, the thermal insulation material and cooling pipe are important temperature control materials to prevent concrete from cracking. In order to select the right materials, their heat exchange coefficients should be obtained exactly. But no proper apparatus can give the parameters through simple measure. An experiment concrete block with the dimension of 50m long and 22m wide was established near a dam construction site and the corresponding inversion calculating was applied. The experiment method is presented. The measured curves and calculated curves meet well which shows the inversed parameters reliable. Then the heat exchange coefficients of the EPE insulation materials with different thickness and the HDPE pipes with different diameters are given. The application effect shows the selected materials have achieved the goal of crack prevention. The experiment and inversion method will provide reference to other cases and the heat exchange coefficients can be used in similar structures.
Research Progress of Wavelet Analysis in Flow Structure Characterization
Authors: Liu Zuo Hua , Zeng Qi Qin , Zhou Xiao Xia , Ning Wei Zheng , Sun Rui Xiang , Tao Chang Yuan
Published: July 2011

The wavelet analysis is a time-frequency analysis method, which plays an important role in processing non-stationary signals obtained by Particle Image Velocimetry (PIV) to measure turbulent flow fields. Current research status for wavelet analysis in the flow field structure was reviewed: eduction of coherent structures and multi-scale structures(the large-, intermediate- and relatively small-scale structures)by wavelet transform and combine with the maximum energy criterion, extraction of coherent vortical structures and analysis of multi-scale turbulent structures information from the time–frequency diagram. Application of wavelet analysis in the flow structures was also prospected.
Research on a Method and Mechanism of Ocean Current Sensor Calibration
Authors: Wang Yong , Sun Jing Hui
Published: July 2011

To generate a tiny and steady force for the calibration of the ocean current sensor, a force-reduction mechanism has been performed in this paper. The paper focuses on the whole process of this mechanism based on the flexible hinges from the working principle, parameter determination to FEM simulation and so forth. By analyzing the relationship between reduction multiple and structural parameters of the levers and hinges, material and geometric dimension are chosen reasonably. Finally, applicability of the choice of the mechanism is verified through finite element analysis. The simulation results show that using this mechanism the input force can reduce to required force of µN for the calibration.
Study of Gas Injection System for EBIT Facilities
Authors: An Shuang Li , He Ya Fei
Published: July 2011

This paper presents a design of gas injection system for the electron beam ion trap and an approach of estimation of the injection efficiency based on geometrical optics model. The differential pumping structure is used to ensure efficient injection without destroying the vacuum. The estimation is proved reliable and reasonable by experiments results.
Study of Multi-Point Flexible Floating Clamping System of Multi-Roll Stretch Forming Process
Authors: Zhang Hao Han , Li Ming Zhe , Fu Wen Zhi , Chen Xue
Published: July 2011

Multi-Roll Stretch forming process is a new flexible process which is used for forming hyperbolic-degree surface pieces. Using the Multi-point flexible floating clamping system, the metal sheet can be more easily formed, and the flexibility can be much higher, which the ordinary floating clamping cannot have. A series of finite element simulations and experiments have been done for the process of forming saddle-shaped parts using Multi-Point flexible floating clamping system, and ordinary floating clamping system. The results show that the quality of the part formed using flexible floating clamping system is better.
A Fault-Tree Based Intelligent Fault Diagnostic System of Heavy CNC Equipments
Authors: Chen Ming , Li Ying Lei , Yu Ying
Published: July 2011

Three main technical problems on heavy equipments fault diagnosis are all solved in the following three aspects. Firstly, build fault trees with the help of reachability matrix. This fault tree building method is helpful to short the labor and time for building fault tree; secondly, design a rule-based reasoning algorithm on the fault tree to avoid the shortcomings of traditional minimal cut sets (MCS) solution; thirdly, design out a new knowledge database structure for fault trees and rules storage. This structure could meet the need of the algorithm; so that the algorithm could be run well with this knowledge database .At the end demonstrate advantages of the fault tree based diagnostic intelligent system with an example.
Numerical Simulation and Experimental Research on a Splash-Proof Water Injector
Authors: Wang Zhong Yi , Han Jia , Yang Xu , Sun Tao
Published: July 2011

In this thesis, a model of water injector is established, which can prevent water from splashing when high-velocity flow pours into a container. With the periodic boundary, the 1/18 calculation domain model is built. Then two-phase flow numerical simulation research is done on the device with the steady VOF model. The influencing factors of water injector's performance and the variation laws under different working conditions are obtained. The reliability of the results is improved by comparing the results from different calculation methods with that from steady-state VOF method. And through the experimental researches on the splash-proof water injector, the accuracy of the numerical simulation results is validated.
Electro-Hydraulic Servo Central Position Control System of Strip Based on the Principle of Differential Capacitance
Authors: Jin Bao Quan , Wang Yan Kun
Published: July 2011

There are some problem for Strip transmission process, such as low deviation information accuracy , poor reliability, poor control results,the electro-hydraulic servo central position control system of Strip based on the principle of differential capacitance was designed. The differential connection is used for eliminating signal drift and the nonlinear characteristics，high frequency power supply is used for reducing output impedance and improving the system bandwidth, double shielded is used for eliminating the impact of parasitic capacitance, the electro-hydraulic servo central position control system based on fuzzy PID is designed. Research shows that the measuring circuit and control system are with high precision, good reliability, maintenance-free advantages.
Manufacturing Technology of μ-Gear and Mold by Fe-Ni Alloy Electroforming
Authors: Son Seong Ho , Lee Won Sik , Lee Hong Kee , Kim Hyun Jong , Park Sung Cheol
Published: July 2011

The micro parts were fabricated by electroforming process of Fe-Ni alloy. Reaction mechanism of Fe-Ni alloy electrodeposition process was investigated using rotating disk electrode. To clarify the rate determining step, the activation energies of iron and nickel elements were calculated from the Arrhenius plot in the temperature range of 308K~328K. The reaction rate of iron in electrodeposition of Fe-Ni alloy was controlled by chemical reaction at temperature range of 308K~318K, while at range of 318K~328K, it was controlled by mass transport. The reaction rate of nickel was controlled by chemical reaction at 308K~318K and by a mixed mechanism of chemical reaction and mass transfer at 318K~328K. For alloy electroforming of micro gears and a mold for powder injection molding, the mandrels of micro gear (1.7mm in diameter and 600 μm in height) and micro mold (550 μm in diameter and 600 μm in height) were prepared by UV-lithography using SU-8 photoresist. Subsequently, Fe-Ni alloy micro gear mold were electroformed with high hardness (490 Hv) and very good surface roughness (Ra 37.5 nm).
Performance Optimization for a 3-DOF Micro-Motion Device
Authors: Zhang Dan , Fassi Irene , Jiang Pei Gang
Published: July 2011

Traditional parallel manipulators suffer from errors due to backlash, hysteresis, and vibration in the mechanical joints. In this paper, a new 3SPS+RPR spatial compliant mechanism which has three degrees of freedom (DOF) and can generate motions in a microscopic scale is proposed. It can be utilized for biomedical engineering and fiber optics industry. The detailed design of the structure is introduced, followed by the performance evaluation. Then, the genetic algorithms and radial basis function networks are implemented to search for the optimal architecture and behavior parameters in terms of global stiffness/compliance, dexterity and manipulability.