bluuebunny/crossref_metadata_2025 huggingface dataset:
A Numerical Model for Evaluating the Casting Complex Degree
Authors: Wu Shi Ping , Xu Qin , Xue Xiang , Wu Guang Ran
Published: June 2012

A quantitative method for evaluating the casting complexity has been elaborated in the present paper. It was consisted of two aspects, one is the casting geometry structure complexity, and the other one is the casting shape-forming complexity. The casting geometry structure complex degree can be described in a quantitative form based on the basic tissues that compose the casting, the geometry structure complexity is C=-[n1log(n1/N)+n2log(n2)/N+...+nklog(nk/N)] . And the casting shape-forming complex degree can be estimated by the surface modulus and its distribution characteristics at x, y, z coordinates. When the casting geometry structure is complex and the shape-forming is complex, the casting can be defined as “complicated casting”.
Kinematics Analysis of the Driving Cylinder for Dual-Rotor Piston Engine
Authors: Sun Chang Xin , Xu Xiao Jun , Pan Cun Yun , Wang Xiao Cong
Published: June 2012

The engine is the most common power source in our life. For a long time, people never stopped research it. Kinematics analysis study the relationship among the position, velocity and acceleration. In recent years, with computer technology, graphics technology and automatic modeling techniques together, much kinematics analysis software came into the world, which makes the engine kinematics analysis more quickly and easily. The article base on the idea of a novel dual-rotor piston engine, describe the structure and movement principle of the driving cylinder, build the kinetic theory model of the key components, and then expand the simulation study, discuss their kinematics properties.
Numerical Analysis of Fluid-Structure Interaction during Ignition Process for Solid Rocket Motor with Stress-Reliver
Authors: Wu Jing , Chen Xiong , Yu Xi
Published: June 2012

During the start-up of ignition process, the solid rocket motor is typically involved in fluid-structure coupling process. The propellant deforms under the gas pressure, thereby influents the gas flow in turn. The aim of this paper is to investigate the coupled effect between fluid and structure during the start-up of ignition process in solid rocket motor by coupling Fluent and Abaqus via MpCCI. The numerical result shows that during the initial stage, the gas flows onto the structural surface. There is a relative enclosure space in thewing slot inside the motor, which causes big deformation on propellant grain and stress reliever. This space is the high-risk area for structural deboning in solid rocket motor.
A Research on Friction Properties of Concave Laser-Textured Surface
Authors: Liang Hua Qi , Kong Hui Fang , Yuan Gen Fu
Published: June 2012

An object’s fine surface can change the object's surface friction property. So this paper aims to study the friction property of concave laser-textured surface through experiment. First, the Nd:YAG laser is used to generate micro-pores on Cr12 steel surface in the research and then its impact on object's surface friction property is studied. The test result shows that compared with the non-textured surfaces, the concave surface with area density of 5% and depth of I10.8 can reduce the friction coefficient significantly.
Positive and Reverse Design of Screw Rotor Profiles with Freeform Curve
Authors: He Xue Ming , Liu Hong Yuan , Lu Yi , Han Ming
Published: June 2012

In the traditional screw compressor rotors profile generation method, the process of cockamamie parameters adjustment and confirmatory will take a long time, so that the modified results can’t be estimated in advance. Based on freeform curve, two rotor profiles generation methods are presented in this paper. One method is positive, and the female and male rotor profiles are acquired by every profile segment defined with freeform curve; another one is reverse, and the rotor profiles are derived through the meshing line. The rotor profiles are fitted by freeform curve and the shape of rotor profile can be adjusted by moving the control points. Finally, the two methods are used to developed a system for designing quickly the rotor profiles.
Pro/E-Based Non-Damage Dynamic Simulation Assembling and Disassembling of CA6140
Authors: Wang Qian , Gong Min Li , Li Ying Zhi
Published: June 2012

CA6140 is the most widely used kind of ordinary horizontal lathes in a factory workshop. This paper, with the aid of Pro / E software and its related functions, visually displays the structure of Lathe CA6140’s main components, dynamically simulates assembly and disassembly processes of its typical mechanism, and thereby realizes its non-damage dynamic simulation assembly and disassembly, creates the mode of combining actual and virtual dynamic assembly and disassembly and realizes the optimization of its assembly and disassembling actions.
Research of Embedded Precision Internal Grinding Open CNC System Based on Decoupling Design
Authors: Xie Ou , Li Hua , Wang Bang Fu
Published: June 2012

This paper introduces an architecture of embedded precision internal grinding open CNC system based on decoupling design, described the decoupling design method and principle. In this design, ARM was the main hardware device for CNC system and the embedded operating system μc/os-ii was used as the software development platform. Decoupling design based CNC system can be good at dealing with multitask and ensure the real time of system control.
The Experimental Research of Vibration Isolation Performance of MR Isolator at High Temperature
Authors: Yan Hui , Chen Liang , Ao Hong Rui , Jiang Hong Yuan
Published: June 2012

Transmissibility is the main performance evaluation index of Metal Rubber (MR) isolator, which can be got by sine sweep frequency test. At different temperature, the sine sweep frequency test is done with different structural parameter MR isolator. The influence that relative density and pre-deformation have on transmissibility and natural frequency when temperature changed is analyzed. The changing regularity of MR isolator’s transmissibility at different temperature is explored. Research results provide the basis for designing MR isolator.
The Finite Element Analysis of Premixed Abrasive Water Jet Abrasive Tank Based on the Simulation
Authors: Zhang Dong Su , Liu Zhao Long , Cheng Gan Lin , Liu Hui , Xu Meng
Published: June 2012

Premixed abrasive water jet abrasive tank has always been under static load in the course of their work, belonging to the pressure vessel. In view of the importance of the pressure vessel safety issues, the traditional design was conservative, and the shell is relatively thick and heavy. This paper uses simulation (finite element analysis module in solidworks)to do finite element analysis of the abrasive tank. In guarantee under the condition of its strength, reducing the shell weight of abrasive tank as much as possible can help to achieve the purpose of lightweight design and saving energy, reducing cost and price.
Tractor Hydraulic Lighten Testing System Based on OPC Technology
Authors: Sang Yun Hong , Ma Liang , Ning Jian , Li Shao Qing , Sun Yi Tian
Published: June 2012

This paper proposes a tractor hydraulic lighten testing system based on OPC technology. OPC technology is well applied to Tractor Hydraulic Lighten Testing System. The host computer can directly communicate with PLC and AD module through OPC technology.The control circuit is greatly simplified, the entire experiments can be completed on PC.The operation is convenient; the system is reliable;the program is easy to debug;test types can choose automatic or manual mode.The actual test results show that the performance of device is stable and reliable.The automation degree of the test system is greatly improved, and the labor intensity of operators is greatly reduced.
Transmission Error Analysis of Space-Curve Meshing-Wheel with Angular Misalignment
Authors: Chen Yang Zhi , He En Yi , Liang Shun Ke
Published: June 2012

In this study, equations of space-curve meshing-wheel (SCMW) surfaces are obtained. Based on the tooth contact analysis (TCA), mathematical model of SCMW is established under the condition of angular misalignment. Numerical analysis and simulation results demonstrate the angular alignment error has an impact on transmission error inevitably. Investigation provides a theoretical reference for adjusting the assembly angle of SCMW.
Measurement and Simulation of Residual Stresses of Electron Beam Welding Joint of Pure Aluminum
Authors: Guo Gui Fang , Zhou Shi Qiong , Wang Liang , Hao Li , Liu Ze Guo
Published: June 2012

The effects of electron beam welding on the residual stresses of welded joints of pure aluminum plate 99.60 are studied by through-hole-drilling and blind-hole-drilling method. Meanwhile, based on the thermal elastic-plastic theory, and making use of ANSYS finite element procedure, a three - dimensional finite element model using mobile heat source of temperature and stresses field of electron beam welding in pure aluminum is established. The welding process is simulated by means of the ANSYS software. The results show that the main residual stress is the longitudinal residual stress, the value of the longitudinal residual stress is much larger than the transverse residual stress. But the residual stress in the thickness is rather small. And in the weld center, the maximum value of residual stresses is lower than its yield strength. The simulation results about the welded residual stresses are almost identical with the experimental results by measuring. So the research result is important to science research and engineering application.
Research on Tool Wear Form in Micro Turn-Milling Process
Authors: Zhao Lin Hui , Zhang Jian Cheng , Su Wei
Published: June 2012

In micro machining, turn-milling tool wear is a key factor for part surface quality. This paper carries on experiments on end mills wear in micro turn-milling machining, aiming to research the wear form and provide some reference data for developing wear standard of small diameter end mills. To measure wear condition of end mills, machine vision technique is utilized. This paper designs and sets up an online end mill wear measurement system for a micro turn-milling process center. With a series of experiments on small diameter end mills, wear conditions of different cutting positions are researched. Based on analysis of experiment data, wear characteristics and wear rule for micro turn-milling process are summarized in this paper.
Constructional Bamboo Plywood Process Control and Production Process
Authors: Feng Ming Zhi , Zhao Rui Long , Lv Na , Zhang Shuang Bao
Published: June 2012

Focusing on the problems of the bamboo plywood existing in the construction field, we have proposed an optimal process for the building bamboo plywood through controlling the preparation process of the bamboo plywood. In our work, moso bamboo was selected as the objective and then a variety of performances of the bamboo plywood were tested with the heat-up-heat-down process. Experiments show that in the same conditions of MC 10%, RC 7%-8%, the best optimum processes of 12mm thick constructional bamboo plywood is 15min pressing time, the pressing temperature between 155°C to 160°C and the sheet density of 0.85 g/cm3. The optimal process to make the performance of bamboo plywood substantially exceeded the European standard the OSB/4 levels. It can provide practical application of engineering and production design with reference value and theoretical basis for the bamboo plywood.
Analysis on Backside Cracks in 316LMod Inner Linings of Urea Reactors
Authors: Cao Huai Xiang , Wang Chun Mao , Qiu Xing Qi
Published: June 2012

Backside cracks were found universally in the ultra-low carbon austenitic stainless steel (316LMod) inner linings of urea reactors in recent years, and led to urea reactors leakage. Analyses on the sample revealed that, the backside cracks were caused by the interaction of wet hydrogen sulfide (H2S) and chloride ions (Cl-) stress corrosion cracking (SCC), and H2S played a dominant role. The source of H2S and chloride ions was the leak detection steam. Furthermore, measures to avoid backside cracks in 316LMod inner linings of urea reactors were put forward and verified.
A Novel Durable Stiffness Finishing of Cotton Fabric
Authors: Hu Wei , Zhang Gang Xian , Chen Shu You , Zhang Feng Xiu , Wu Da Yang , Zheng Hui
Published: June 2012

In this paper, poly (vinylalcohol glycidyl ether) (PVAGE) was synthesized as a novel reactive stiffening agent to improve the stiffness of cotton fabric. Cotton fabric could be grafted with PVAGE under high temperature and the grafting rate would increase with the increase of PVAGE concentration. The cotton fabric grafted with PVAGE has excellent washing durability. The wearability of cotton fabric grafted with PVAGE was also studied. As the increase of grafting rate, the flexural stiffness increased dramaticly; tensile strength increased a little; cockle elastic decreased slightly; and air permeability and whiteness also decreased but were still in acceptable range.
Analysis of Micro Structure’s Elastic Stiffness
Authors: Shen Li , Gao Shi Qiao , Jiang An Ran , Wang Cai Feng
Published: June 2012

Based on the calculation and analysis of three kinds of elastic beam’s stiffness coefficient in micro machined gyroscope, the results show: in the condition of small displacement，forces and displacement are linear relationship in clamped-clamped beam, crab-foot beam and bow beam; but as the displacement increases, the relationship between forces and displacement are obvious non-linear in clamped-clamped beam. When the displacement is three times the length of beam’s width, the bow beam’s force and displacement are linear relationship. By ANSYS crab-foot beam and bow beam’s stiffness is obtained, the simulation results and the polynomial fitting coefficient are all credible.
Analysis of WC Dissolution Phenomenon Happened in TIG Welded Joint of Cemented Carbide and Invar Alloy
Authors: Xu Pei Quan , Ma Ding , Ma Chun Wei
Published: June 2012

In current research, WC dissolution phenomenon happened in TIG welds was investigated and discussed. And the element diffusion was studied using area-scanning method. The results showed that the WC dissolution phenomenon always happened near WC-Co/Welded seam interface. Moreover, the amount of WC dissolved in welds became less from WC-Co, welds to invar alloys. WC dissolution happened in welded seam induced by tungsten arc led to the WC grain growth (60µm or so) and WC shape changes. The grain boundary (GB) between different WC particles during WC aggregation was also confirmed and WC grain growth was owed to the WC aggregation during the processing of WC dissolution.
Compression Deformation Behavior of AZ91D Magnesium Alloy at Elevated Temperature
Authors: Chai Yue Sheng , Chen Yong Zhe , Liu Wen Feng , Sun Gang
Published: June 2012

Hot compression tests of AZ91D magnesium alloy were performed on Gleeble1500 ranging from 0.001 to 1 s-1 and deformation temperature ranging from 200 to 400°C. The results show that flow stress is dependent on deformation temperature and strain rates．When strain rate is a constant, flow stress decreases with the increasing deformation temperature. Meanwhile, as deformation temperature is a constant, flow stress increases with the increase of strain rate, which can be demonstrated by a Zener-hollomon parameter in the hyperbolic-sine-type equation during hot compression deformation. The hot deformation activation energy is 176.01kJ/mol and the stress exponent is 7.85 during hot compression deformation of AZ91D magnesium alloy.
Continuous Cooling Transformation Behavior of D460 Ship Plate Steel
Authors: Bao Jun Cheng , Ning Bao Qun , Zhao Jie , Li Jian Ping
Published: June 2012

Through the thermal mechanical simulation experiment，combined with the metallographic analysis and microhardness test on the Nb-Ti micro-alloyed steel for the austenitic continuous cooling process. The results shows that: with the increasing of the cooling rate, the phase transformation starting and ending temperature decrease and the ferrite content was decreased at room temperature. In less than 5°C/s low cooling speed region, with the increasing of the cooling rate, the grain size of tested steel obviously increases; In more than 17°C/s high cooling speed region, the grain size and vickers hardness of tested steel change and tends to be smoothly.
Miniature Flexible Pneumatic Actuator
Authors: Ionescu Mircea , Roșca Ileana Constanţa , Braun Barbu Cristian
Published: June 2012

This document deals with optimization of flexible pneumatic actuator (APF), used to develop a force of thrust. It was intended for efficient routing of strain and was carried out for research on materials used, shape of pressurized chamber, and the introducing of no elastic materials for fittings and fixtures. This study was focused on the properties of compressed air and makes a small pneumatic actuator that develops useful force by expanding the volume of a pressurized chamber made out of elastic material. The research performed on this type of actuator has led to a small APF (10-20 mm) with more than satisfactory results, with a wide range of uses in automation, robotics, medicine, aviation and more.
Spherical Ultrasonic Motor for Pipe Inspection Robot
Authors: Toyama Shigeki
Published: June 2012

We present a pipe inspection robot using a newly developed spherical ultrasonic motor (SUSM) as a camera actuator. The novel SUSM has improved the range of movement compared to previous SUSMs, and the robot can point a camera in any direction. In this study, we determined a method for controlling the rotational direction and strategic control from the kinematics and characteristics of ultrasonic motors. The rotational directions were defined by the phase differences of the applied voltages, and the rotational speeds were changed with the frequencies. Additionally, we developed a very small position sensing system using rotary potentiometers. In the control experiment performed using the sensing system, the SUSM showed the returnability to the default position from several specified points, within an accuracy of 1°.
Database Encryption for Dababase-as-a-Service
Authors: Xiang Zhong
Published: June 2012

Cloud computing gives out the ability that sells computing, storage and other IT resource as service instead of sells hardware. There are also some problems that block the advancement. This paper discussed these problem, especially in database-as-a-service then introduced a mean-tree structure, that extends the encrypted database’s ability, trying to surpass the existence conclusion that an encrypted database is inefficient.
The Visualization for SMT Based on Raster Data Engine
Authors: Liu Chen , Zhang An Tang , Liu Tao , He Hui Sen
Published: June 2012

This paper proposes a raster-based data visualization engine method for the visualization of SMT, through COM technology, using standard data access interface and a consistent approach to separate data management and data analysis, this method try to transform EDA vector data into bitmaps, the aim to provide a fast and efficient to create three-dimensional data model PCB substrate, the resault is that removing the adverse vector graphics technology,reducing the complexity of the algorithm, reducing the cost of computer time and improving surface mount visual display speed.
The Research on Slices’ Data Repair and Filling Path Optimization
Authors: Zhu Gen Song , Xu Wei , Xu Zhi Feng
Published: June 2012

Fused deposition modeling (FDM) is one of rapid prototyping process, which process includes Common Layer Interface (CLI) file generation and rapid prototyping. This paper focuses on algorithm to repair error datum of slices to generate CLI file and arithmetic-zoning scanning algorithm based intersection sorting which were used to FDM process. Conclusions of experiment show that the algorithm to repair error datum of slices can correct repair the error datum and fast extraction of contour information, and it provides an efficient method for generating CLI file from Stereo lithography(STL) slices; that arithmetic-zoning scanning method can reduce the possibility of model wrapping and shrinkage stress. The two algorithms improve production efficiency of FDM and are worth promoting.
A Text Categorization Method Based on Features Clustering
Authors: Feng Zhi Bin , Zhang Ping Jian , Zhao Juan Juan
Published: June 2012

Choosing Features of a text is an important part of text categorization. Its result can affect the quality and efficiency of the text categorizer. Since there are usually thousands of features of a text, it always needs to reduce the dimension of the feature space. Considering the semantic relationship among words, a new text categorization method based on features clustering is proposed in this paper. This method first uses word segmentation to split texts into words, then, remove stop words and words with low information, and then calculate the distribution of words in these texts to construct a matrix of co-occurrence words. After that, cluster algorithms are employed to reduce the dimension of the feature space. Finally some experiments are carried out on two corpuses using several text categorization algorithms. The results demonstrate that this new method can not only improve the precision and recall of text categorization, but also increase the efficiency.
Design of Real-Time Image Collecting Module Based on FPGA
Authors: Wang Jiang Wei , Ma Mu Yan , Leng Jun Min
Published: June 2012

A new pixel collecting interface board based on FPGA is designed, it is a part of conveyer belt’s fault detection device. The previous system’s controller chip CPLD is replaced by FPGA, the memory FIFO chips are replaced by SRAM, the chip CY7C68013 is chosen as the USB 2.0 controller and works in Slave FIFO transmission mode. The firmware program and application program are compiled to transmit data. The Chipscope Pro Tools are used in the system to debug online, and the correctness of data transmission can be analyzed and verified. The experimental results demonstrate that the new pixel collecting interface board has the advantage of high-speed data acquisition, and can transmit data in real time and correctly. It also has a good scalability and can be used into other high-speed acquisition systems.
Road Conditions Test in Virtual Driving System Based on Cohen-Sutherland Algorithm
Authors: Sun Hui , Wang Yu Zeng , Li Ya Lin , Li Bai Zhen
Published: June 2012

This paper discusses the methods of improving the efficiency and exactitude of the road conditions test though the modeling test algorithm. It presents the data structure of road model in which double direction data chain can be established. There are two clipping windows, Wout and Wcontour. Wout would eliminate the lines that can’t intersect rapidly. The lines that maybe intersect would be estimated exactly by Wout after coordinates transforming.Thealgorithms of the road conditions testing are proved to be efficacious.
Multi-Objects Detection in Remote Sensing Images Using Multiple Kernel Learning
Authors: Li Xiang Juan , Sun Hao , Zheng Xin Wei , Sun Xian , Wang Hong Qi
Published: June 2012

The objective of this work is multiple objects detection in remote sensing images. Many classifiers have been proposed to detect military objects. In this paper, we demonstrate that linear combination of kernels can get a better classification precision than product of kernels. Starting with base kernels, we obtain different weights for each class through learning. Experiment on Caltech-101 dataset shows the learnt kernels yields superior classification results compared with single-kernel SVM. While such a powerful classifier act as a sliding-window detector to search planes in images collected from Google Earth, results shows the effectiveness of using MKL detector to locate military objects in remote sensing images.
Research on Construction of Semantic Web of 3D Model Database
Authors: Jia Hui , Geng Guo Hua , Yang Jin Xia
Published: June 2012

This paper presented a new method to construct semantic web of three-dimension model database based on ontology. Firstly we build ontology of three-dimension model database, according the model to extract classes, objects and attributes. Secondly utilize WordNet which is an English ontology to expand original ontology node to semantic extension node, including synonym, hypernym, hyponym and holonym. Experiment result shows that this method not only effectively expands the semantic vocabularies of a 3D model database, but also keeps good semantic relevance of the expanded vocabularies to the original ones, so as to achieve semantic based 3D model retrieval effectively.
A Survey on Emotional Semantic Mapping in Image Retrieval
Authors: Liu Zeng Rong , Li Zhi , Yu Xue Li
Published: June 2012

Emotion plays an important role in the human perception and decision-making process. Human comprehension and perception of images is subjective, and not merely rely on lower-level visual features. Semantic gap is regarded as the most important challenge of image retrieval. In this paper, we analyzed the emotional features as well as emotional semantic description of images, which comes from the image emotional semantics retrieval framework. And also the mapping ways and means were summarized from image visual features to emotional semantics. Finally, the disadvantages of emotional semantic mapping and developing tendency were discussed.
Virtual Assembly Simulation Method for Complicated Mechanical Product
Authors: Sun Bo , Zhang Shao Yun , Cao Yan
Published: June 2012

The generation of assembly plans for a new complicated product is often a lengthy and costly manual process. In this paper, the pose description and transformation of mechanical part in virtual assembly space are studied. The assembly simulation idea of “detachable means installable” is discussed. A kind of complicated mechanical product assembly simulation process is proposed. Taking a car model as an example, the application of the assembly simulation process is introduced. In this process, complex and low efficiency computation in the assembly process could be avoided.
Mechanical and Tribological Properties of Diamond-Like Carbon Coatings with Different Ni Content
Authors: Ling Xiao , Yu Shu Rong , Zhang Jun Yan
Published: June 2012

Ni-doped diamond-like carbon coatings were deposited on silicon wafer by magnetron sputtering. The Ni content was controlled by changing the Ni target current. The Ni content, mechanical properties and tribological properties of the coatings were systematically studied by Raman spectroscopy, nano-indentation and ball-on-disc tester. The highest hardness and internal stress are obtained at the Ni content of 2.3%. The friction coefficient and wear rate lower with the decreased of the Ni content, which may be responsible for the excellent tribological properties.
Decision Tree Based Rules Redistribution Algorithm for IP Monitoring of Lawful Interception on IPv4 Networks
Authors: Ma Xiao , Qu Sheng Kai , Tang Qin Qin , Huang Xin
Published: June 2012

IP networks were growing rapidly over past decades. Perhaps more significant is the impact that it is also provide a medium to the illicit activities. Therefore, IP monitoring of lawful interception of IPv4 Networks was proposed to combat against those illicit activities over IP Networks. The Law Enforcement Agencies (LEA) can monitor the IP packets as well as capture them for analysis or providing forensics. In order to assist IP Monitoring of lawful interception from technical perspective, we propose a scheme named Decision Tree Based Rules Redistribution Algorithm (DTBRRA) which can be fast applied on IP networks.
Image Encryption Algorithm Based on Image Element and DFRCT
Authors: Zhu Gui Liang , Qin Xiao Li , Zhang Xiao Qiang
Published: June 2012

A discrete fractional cosine transform with arbitrary period is proposed, which is a linear combination of discrete fractional cosine transform (DFRCT). We propose a new image encryption algorithm based on the discrete fractional cosine transform with arbitrary period, and set up some experiments by the different image block methods. The specific steps of encryption and decryption are given, and this encryption algorithm in items of many evaluation indexes is analyzed. The results of the detailed analysis demonstrate that the encryption algorithm effectiveness, efficiency and ability to resist brute-force attack are satisfying.
A Novel Algorithm of Fractal-Wavelet Image Denosing
Authors: Xu Tong , Huang Lei
Published: June 2012

Image denosing is the first preprocessing step in dealing with image processing where the overall system quality should be improved. So it is a key issue in all image processing researches. Over the past years, fractal-wavelet transforms were introduced in an effort to reduce the blockiness and computational complexity that are inherent in fractal image compression. The essence of fractal image denosing is to predict fractal code of a noiseless image from its noisy observation. From the predicted fractal code, we can generate an estimate of the original image. In the paper, we show how well fractal-wavelet denosing predicts parent wavelet subtrees of the noiseless image. The performance of various fractal-wavelet denosing schemes is compared to that of some standard wavelet thresholding methods. From the several of experimental results, these fractal-based image denosing methods are quite competitive with standard wavelet thresholding methods for image denosing.
Range Particle Algorithm Application in the Solving Inverse Problem of Line Source
Authors: Yu Ke Guang
Published: June 2012

Now mature and effective algorithms for the numerical solution of inverse problem of line source are few, so the researching of algorithms for the problem is urgent and necessary. Firstly, a brief introduction to the characteristics of solving the inverse problem of the line source is given, and the mathematical solution model of inverse problem is established based on the Line source equation, Secondly a new algorithm (Range Particle algorithm) based on range searching algorithm is proposed for the numerical solving the inverse problem of the line source particle and the basic implementation steps and parameter adjustment of the algorithm also be discussed. Finally, simulated and measured data were used to test the effect of the algorithm. The results show that the range particle algorithm is an algorithm of high precision, fast convergence and computational stability for the solving the inverse problem of the line source and it do can be applied in Engineering.
Application of Data Fusion Based on Genetic Algorithm and BP Neural Network in WSN
Authors: Xu Yi , Li Zhao Xiang , Liu Jiao Jiao
Published: June 2012

Energy-saving is one of the inevitable problems of the routing design in WSN, while Data Fusion technology is widely utilized in energy constraint WSN to reduce the amount of messages exchanged between sensor nodes. This paper proposes a new algorithm based on Integrated Genetic and BP Neural Network(IGBP), IGBP uses the global search capability of GA to remedy the deficiency of BP artificial neural network. First, IGBP generates the best individuals in different networks by GA algorithm. Then it chooses the most optimize individual measure by Mean Squared Error to construct the BP network which was supplied to train of the WSN. Using the optimize individual nodes as initialization value training the BP network, it will enhance the learning rates of convergence and avoid falling into the local minimums .The simulation results show that the IGBP algorithm has made great progress in balancing the consumption of energy so as to prolong the network lifetime.
An Improved IPP Planning Algorithm and the Application
Authors: Gao Jian
Published: June 2012

Most of planners can’t avoid state combinatorial explosion which is a main problem to planning failure. To solve it, the paper brings forward the arithmetic of goal decomposition and initial decompositioin to partition the fact file for planner, thereby to reduce number of combinated states. But then, for the planners in being can’t deal with the multiple fact files, to settle which, withal, the paper introduces the arithmetic of multi-fact file management. The application for three arithmetics is on IPP possessing preferable performance. The modified planner is called MF-IPP which is able to handle multiple fact files for avoiding the combinatorial explosion. At last, we compared the performance of the two planners, and the result showed that MF-IPP can avoid the combinatorial explosion well, and the test case covering rate is meseasued by two novel rules.
Optimal Design of the Needle Bed Slot Milling Machine Based on ANSYS
Authors: Qi Wen Jun , Xu Zhao Kun
Published: June 2012

The first order optimization of the ANSYS design module is used for optimizing the stucture parameters of wall thickness and the ribs. And a comparison of static and dynamic modes is made between the original model and the optimized one under the same load condition. The results show that total volume of the optimized model is significantly reduced compared with the original one with little change in aspect of static and dynamic characteristics.
Application of Improved Artificial Fish Swarm Algorithm to Slope Stability Analysis
Authors: Liu Jia , Li Jing , Huo Jun Yi , Liu Li Na
Published: June 2012

The Sweden method of slices is used as the data model for slope stability analysis and a new searching method for slope stability analysis is presented. This method, named SAA_IAFSA in this paper uses the artificial fish-swarm algorithm based on simulated annealing algorithm to search the critical failure surface and minimum safety factor. This method can overcome the disadvantages of traditional optimization method such as easy to fall into local extreme points with high accuracy, applicability, and can get a more accurate global optimal solution. Finally, the feasibility and effectiveness of the new approach is verified by practical problem. The experimental results show that the proposed algorithm is significantly superior to original AFSA, with wide application.
Hydraulic High Speed On-Off Valve and its Application on Industry
Authors: Chen Wei Ning , Xu Yang Zeng , Yang Li Hong
Published: June 2012

High-speed on-off valve has been introduced in this paper with its concept and applications in various industries. Its trend and development in the future is optimized. This technology does challenge the proportional and servo technology in hydraulic area, because the technology can be used in displacement control of hydraulic pump, proportional and servo system, valve bank shifting, digital cylinder and so on.
A New Millimeter Wave Mixer Based on the Groove Guide
Authors: Sun Yu Feng , Sun Zhen Qiang , Wang Ping Zhang
Published: June 2012

A novel groove guide mixer was proposed. The key features of this mixer are large dimension and good signal-to-noise performance. The shell of this mixer is made up of a novel waveguide, the groove guide. A planar logarithmically periodic antenna was installed in the guide. It received signals in the guide and transmitted them to the mixer diode. A compact multi-section coaxial filter was arranged to lead the intermediate frequency signal out of the shell. At the end of the mixer, a matched terminator is adopted to absorb millimeter wave signals. One model of this mixer was designed, fabricated and tested at 93.069GHz. It works well on millimeter wave band.
Influencing Factors of Hydraulic Property of CFBC Ashes
Authors: Song Yuan Ming , Liu Jing Xiang , Wang Chao , Zhong Hong He , Ding Tian
Published: June 2012

The hydraulic property of Circulating Fluidized Bed Combustion (CFBC) ashes has a significant impact on their treatment and re-utilization. The studies on several CFBC ashes show that the hydraulic property of them is obvious, and even the hydraulic rate is so fast that CFBC pastes can harden within several hours after molding. The influencing factors of hydraulic property of CFBC ashes are investigated. The results confirm that the content of the free lime and the high-activity components has great influence on the hydraulic property of CFBC ashes.
Analysis of Image Characteristics of Plume and Spatter of High Power Disk Laser Welding Based on K-L Transform
Authors: Wen Qian , Gao Xiang Dong
Published: June 2012

Metal vapor plume and spatters are the important phenomena in the process of high power disk laser welding, and there exists a close relationship with the welding stability. The images of metal vapor plume and spatters which captured by a high speed camera during high power disk laser welding were analyzed in this experiment. Image processing techniques such as median filtering, Wiener filtering, gray level threshold and lightness transform were used to process the images so that the image characteristic parameters such as the area and number of spatters in an image, the average gray, mean value, variance and entropy of a spatter gray level image and the coordinate ratio of the centriod of plume and the welding point can be extracted. To reflect the actual welding results obviously by those characteristic parameters, K-L transform method was used to get a new set of characteristic parameters. Experimental results showed that this new set of characteristic parameters could reflect the actual welding effectively.
Wavelet-Based Finite Element Simulation of Alloy Crack
Authors: Zhang Shu , Meng Lei
Published: June 2012

Organizations can significantly reduce defects in single crystal nickel-based alloys and plastic creep life, with the creep for the alloy in the near crack region γ' bent along the direction of applied stress axis was 45° angle to form raft-like structure, the circular hole defects Elongated along the stress axis into an oval, and the formation of cracks in the holes on both sides and along the direction perpendicular to the stress axis expansion. During the high temperature creep, the stress near the crack contour region with the disc distribution, along with the applied stress axis orientation angle of 45° have greater value, the stress distribution is converted to γ' phase angle of 45° Raft-like structures of the main reasons. γ' Phase directional coarsening. In this paper, wavelet transform and finite element analysis to simulate the change
The Numerical Simulation of the Impact on the Hangzhou Bay Bridge Offshore Platform and the Sightseeing Tower
Authors: Bai Hua , Wang Fang Liang , Li Yu
Published: June 2012

In this paper, the distribution of surface wind pressure and wind speed of Hangzhou bay bridge, offshore platform and sightseeing tower is numerically simulated based on Fluent. Two turbulence models, standard k ε model and Realizable k ε model, are used. The influence of the wind pressure distribution of the offshore platform and sightseeing tower by Hangzhou bay bridge is also analyzed. And the detailed comparison between numerical simulation and wind tunnel test is given. Results show that the impact of Hangzhou bay bridge on platform and sightseeing tower occurs mainly with the angle of the wind less than 450. When the angle of the wind is more than 450, the impact is little. The upper of the sightseeing tower does not almost suffer the effect of other buildings. The surface pressure of the platform changes from 5% to 15% between under bridge and under non-bridge condition. The surface pressure of sightseeing tower changes from 0.05% to 3%. The influence on the platform by the bridge is significant but not significant on the sightseeing tower. The simulation results of the tower and mast structure given by both standard k ε model and Realizable k ε model find that the windward side is ideal; the crosswind side is the best; the leeward side is less than ideal. By contrast, the Realizable k ε model is a closer correlation with wind tunnel test than standard k ε model.
Structural Design of Experimental Study on Rain-Wind-Induced Vibration of Strayed Cables
Authors: Li Wei , Guo Wei , Bai Hua
Published: June 2012

To study the aerodynamic characteristics of strayed cable under wind and rain, with the object of the Zhijiang bridge, pressure experiments on the 2- and 3-dimensional models of stay cables in wind tunnel are made. Mean and fluctuating wind-pressure coefficients with 2 kinds of surface morphology under different wind direction angle are obtained. The results show that the rivulet position will greatly influence the distribution of pressure coefficients on the cable surface, and the separation point of the flow nearby the rivulet will be changed obviously. Aerodynamic coefficients will be changed when the rivulet be in a certain position, then the rain-wind-induced vibration will occur .The experimental results will be the guidance for the wind-resistant design and the safe production of the long-span cable-stayed bridges.
Integrated Rolling Bearing Type Selection and Parameter-Driven Graphic Resource System
Authors: Yao Hui , Cao Yan
Published: June 2012

To solve rolling bearing type selection in engineering design, with the development tool of Visual LISP and parametric design method, module programming is used to develop an integrated rolling bearing type selection and graphic resource system that accords with national standards and design process in machinery industry. According to the Latest Bearing Manual and newest National Bearing Standards, the bearing performance analysis algorithm module and Access databases of rolling bearings are established. Under the controlling of a process management module, AutoCAD is connected with Access and the data is queried in the Access databases. Thus, the designer is guided to accomplish the rolling bearing type selection step by step according to its performance requirements. In addition, the system integrates the bearing graphic resource module and according to the user requirements, the system completes the detail drawing of the rolling bearing automatically. The system interface established with DCL is easy to use and accords with engineering personnel’s habits. The system can be extended to include other rolling bearing type selection and graphic resource system. It is proved that the system can improve product design efficiency and quality.
Design of a Switching Control Scheme for Uncertain Objects Based on PID-Type FNN and LS_SVMs
Authors: Zhao Jun , Li Gan Ping , Zheng Chao Dan
Published: June 2012

PID control schemes have been widely used for industrial process systems over the past several decades. Recently, by combining traditional PID method with modern intelligent control scheme, various control design methodologies have been proposed such as fuzzy PID, neural PID and PID self-tuning by pattern recognition. However, the serious problem here is that the controller parameters must be suitably adjusted according to the property of the controlled object, which often changes gradually. Many identification methods are introduced to cope with this problem, among which the neural network identification is widely used. Generally a static network cannot adequately approximate a dynamic system and the training speed of dynamic network is very slow while the convergence cannot be guaranteed. Moreover, if the range of system uncertainty is very wide, the control performance becomes quite conservative. In this paper, a kind of objects with the wide range of uncertainty is considered and a novel control scheme with switching structure is proposed. A PID-type fuzzy neural network(PFNN) is designed as the controller and optimized by offline quantum-behaved particle swarm optimization(QPSO) with chaos strategy and online error back propagation tuning. The least square support vector machines (LS_SVMs) are introduced to determine the suitable controller parameters by switching and identifying the controlled object. Finally, the simulation results show the feasibility and validity of the proposed method.
Design and Implementation of Authorization Management System Based on RBAC
Authors: Zhao Fang , Wang Lei , Tian Xuan
Published: June 2012

Authorization Management is one of the key components in Management Information Systems (MIS) for the security consideration. The adopting of Role-Based Access Control (RBAC) approach makes Authorization Management more efficiency and security. In this paper, we present a way to manage user’s privilege by constructing user’s function menu in the tree pattern based on RBAC in web-oriented system. The architecture of the Authorization Management System, the design of the database, the constructing of dynamic resource tree and the verification of user’s privilege are mainly introduced. The development of the system is under MyEclipse IDE and using MVC pattern.
Simulation and Analysis to Control Algorithms of the Large Time-Delay System Based on Simulink
Authors: Li Shi Zhe , Ma Yong Guang , Zhao Zheng
Published: June 2012

Because of the universal existence of time-delay phenomenon in industrial process control, this paper analyzes the characteristics of two kinds of control methods, discusses the relations between general control algorithm and Smith predictor compensation, and simulated studies the mismatch of model, the change of delay time and the effect of the disturbance to the system. Simulation results show that: improved Smith predictor controller has the advantages of fast response and low overshoot. Especially in the case of the mismatch of model, it has better robustness and stronger anti-interference ability. The improved Smith predictor brings a good quality, which has little sensitivity to the model parameters. It provides a kind of method to overcome the time delay.
Application and Research of Bayesian Network in Data Mining
Authors: Zheng Cui Fang , Jiang Long , Jiang Li Qing , Wu Zhi Jie
Published: June 2012

Data mining techniques give us a feasible method to deal with great amount of data, which is generated during the software developing. Many methods have been used in data mining, Bayesian networks become a focus currently. It is a powerful tool and can be used to do uncertain inference. Bayesian networks have several advantages for data modeling. This paper mainly discusses the definition and building of Bayesian networks, research software engineer based on data mining, and builder a application model of data mining in software engineer, description detail the core arithmetic of Bayesian network. An instance is presented to indicate the applications of Bayesian network in data mining technology final. The experimentation proves its practicality and availability.
Active Contour Driven by Edge and Region Image Fitting Energy
Authors: Xu Hai Yong , Liu Ming Hua
Published: June 2012

In this paper, we propose a novel edge and region-based active contour model. We consider geodesic curve and region-based model, and evolve a contour based on global information. Moreover, we add to the level set regularization term in the energy functional to ensure accurate computation and avoids expensive re-initialization of the level set function. Experiments on synthetic and real images show desirable performances of our method.
A Study on Localization of Acoustic Emission Source Based on Algebraic Neural Network
Authors: Lin Zhe Zhi , Cheng Xin Min
Published: June 2012

We propose the concept of algebraic neural network and introduce the algebraic algorithm in the network-training phase, which transforms the complex nonlinear optimization problem to a set of simple algebraic equations and achieves the best result directly. The experimental results show that rub-impact AE source localization problem is well solved by combining the nonlinear dynamic features and neural network, thus to provide cue to rotor rub-impact fault diagnosis and the application prospects and further research values are promising.