bluuebunny/crossref_metadata_2025 huggingface dataset:
Morphology-Based Steels Automatic Counting Method
Authors: Wang Wen Cheng , Chang Fa Liang
Published: September 2010

In order to solve the automatic counting problem of steels, this paper has proposed a image recognition method based on mathematical morphology. It captured the tiling steels image by CCD firstly. Then, the image is sent to computer and preprocessed by using denoising operation and binary segmentation et al.. Finally, the binary image was thinned using hit and miss transform which based on morphology, and the number of steels was obtained. Experimental results showed that this method is convenient and can enhance the accuracy of the steels automatic counting.
Study on Anti-Disturbance of Linear Servo System Used for Piston Machining
Authors: Cui Hong , Cui Jing Hu
Published: September 2010

The performance of anti-disturbance is a key problem in the process of middle-convex and varying ellipse piston machining. In practical application, the system can easily trace external periodical signal off-load. But if anti-disturbance can not reach requirement, the capability of tracing reference signal will reduce severely to influence machining precision on-load. The disturbance restraint for varying load to linear servo drive system is studied in the paper and the disturbance of cutting force varying periodically is pointed out. A new control strategy integrates repetitive control with iterative learning control algorithm is proposed in order to reduce the influence of load disturbance to tool position. A new train of thought to improve middle-convex and varying ellipse piston machining precision is proposed in the paper.
Study on Chaotic Theory in an Information Security Management Approach
Authors: Ji Zhi Gang
Published: September 2010

This paper discussed library under the network environment of the movement and the development. Digital Library will be understood as a new information environment is a more broad definition. The mandate of the Digital Library will focus on building a network of resources and resource organizations, the number of objects a unique identifier, metadata interoperability, digital resources, such as opening up links.
The Stability Control of Individual Drive Electric Vehicle Based on Torque Distribution
Authors: Li Ju Wei , Cui Xiao Lin
Published: September 2010

A direct yaw moment control (DYC) method based on optimal predictive method is proposed to achieve an external yaw moment which is as low as possible. This control method calculates the necessary moment according the vehicle condition, and then optimizes the distribution of drive/brake torque to achieve the necessary yaw moment considering the constraints of actuators. The effectiveness of the designed controller is investigated by simulations. The simulation results indicate that a satisfactory handling performance can be achieved when the proposed controller is applied.
Modal Analysis of Interior Acoustic Pressure Distribution of Bus Bodywork
Authors: Guo Li Xin , Cui Jia Chao , Zhang Yi Min
Published: September 2010

The characteristic of vibration and noise of an automobile has become an important guide line to evaluate an automobile during the development of manufacturing and comfort of automobiles. In this study, finite element modal analysis was used to extract the acoustic resonant frequency and acoustic modal modes. The results show that the influence of vehicle seats on the acoustic modality should be considered in the acoustic design of vehicle interior cavum. Higher acoustic pressure areas for lower acoustic modalities mainly lie at the anterior/posterior ends or middle of the vehicle interior cavum.
Research on Motion Profile Smooth Control Algorithm Based on Continuous Jerk
Authors: Zhao Guo Yong , Zhao Yu Gang , Hou Rong Guo
Published: September 2010

Motion profile smooth control is significant to reduce the obvious impact on machine tool in high speed and high accuracy CNC machining. However, the jerk is discontinuous and brings about flexible impact on machine tool in the linear Acceleration/Deceleration (ab. Acc/Dec), exponent Acc/Dec and S curve Acc/Dec approach. In the paper, the CNC machine tool dynamic model is built up to analyze the cause of machine impact, to describe the mathematics and physics meanings of jerk. Then a new Acc/Dec approach in which the jerk is continuous is put forward. And the motion profile smooth control algorithm based on continuous jerk is developed in details according to the permissible maximum acceleration, the permissible maximum jerk, the machining program segment displacement and the instruction feedrate. The motion profile smooth control algorithm can achieve continuous jerk, reduce impact on machine tool effectively, and be important to high speed and high accuracy CNC machining.
Influences of the Noise of Woodworking Wide Belt Sander on Human’s Psychological Load
Authors: Mo Qiu Yun , Li Hao
Published: September 2010

The acousic comfort of woodworking wide belt sander has been evaluation by impacts of on-the-spot noise and the main single frequency noise of woodworking machine-sander on workers’ physiological and psychological load from the aspect of the noise influencing heart rate．Experimental noises are abstracted from the noise of the woodworking sander under the usual processing, as the noise source．The heart rate experiments are done under two states, namely the noise and the quiet in the laboratory．Finally, the change of human load is analyzed on the basis of the heart rate．The method of heart rate instead of traditional noise level puts more emphasis on the workers’ psychological load than traditional methods．The noise influence on human body is discussed from the aspects of both psychology and physiology. The results show that the influence of the 67 Hz noise on human body’s load is the greater than the other noises in the noise-exposed period and that of the 1422 Hz noise is the greatest and most difficult to recover in the experimental recovery course.
Vibration Measurement and Data Analysis of a Spinning Shaft Using a Camera-Based Motion Analysis System
Authors: Qian Xin , Lin Guo Chang , Du Xing Wen
Published: September 2010

This paper presents the use of a camera-based 3D motion analysis system for non-contact dynamic testing of a highly flexible spinning vertical shaft. The camera system uses high-resolution CMOS cameras to measure instant geometry of the shaft when visible red digital LED strobes are synchronized to work at a speed between 0.1 to 2000 frames per second. Dynamically deformed geometries are obtained by tracing the three-dimensional instantaneous coordinates of markers adhered to the shaft’s outside surface and triangulation techniques for identifying markers’ coordinates. Numerical simulation and experimental results show that the use of camera-based motion analysis systems is feasible and accurate enough for dynamic experiments. For dynamics characterization, we present the use of the Hilbert-Huang transform (HHT) for time frequency analysis of measured dynamic responses. The results show that the third-mode vibration has a cubic nonlinearity.
Analyzing of Dynamic Characteristics of Special CNC Machine Tool
Authors: Wang Ke , Lv Guang , Sun Xing Wei
Published: September 2010

The dynamic characteristics of machine tool is an important factor, which make affect on the cutting stability of machine tool. The poor dynamic characteristics will seriously affect the stability of cutting, make the low cutting efficiency and low machining precision, and also accelerate the wear of tools and even reduce the machine’s service life. So it is necessary to analyze the dynamic characteristics of machine tool, and according to the results of analysis to optimize structural parameters and motion parameters of the machine tools. This paper analyses the dynamic characteristics of machine bed and machined work piece of the CNC special machine tool for Kelly with the finite element software, and analysis of excitation characteristics of cutting tool. It also makes optimization design to the machine bed, through the analysis and optimization, the natural frequency and stiffness will be obviously improved. According to the structure and calculation of the motion parameters we can get the exciting force frequency to workpiece when it is cut, using interlocking tooth cutting method to replace the initial symmetrical cutting method in order to avoid the resonance produced in the cutting process and improve stability. The exciting frequency when cutting can be improved and the probability of resonance when cutting is lowered. All these ensure high efficiency and high stability cutting.
Research on Vibration Behaviors Simulation for a Novel High-Speed PMT
Authors: Chen Xiu Long , Jia Shuai Shuai , Jiang Xue Yan , Zhao Yong Sheng
Published: September 2010

In order to grasp the vibration characteristics of a novel High-Speed 4-HPS-HPH PMT(parallel machine tool), A vibration behaviors analysis method using virtual prototype simulation was put forward. By the united application of CAD, CAE and visual technologies, the rigid-flexible vibration model of 4-HPS-HPH PMT was constructed. Then the dynamic response of the tool tip, including vibration displacement, vibration velocity, vibration acceleration, and maximum dynamic stresses of driving limbs were realized. The simulation results show that the rigid-flexible vibration model proposed can indicate the vibration behaviors of parallel machine tool. This research provides necessary guidance for dynamic performance analysis, optimization design and control of this 4-HPS-HPH PMT.
Modeling and Simulation of Hybrid Hydraulic Excavator Based on AMESim
Authors: Cheng Kai , Zhang Jing , Dai Qun Liang , Wang Peng Yu , Zhang Jun
Published: September 2010

The theory of the excavator’s hydraulic system was elaborated in the paper taking a 20t hybrid hydraulic excavator produced by a domestic company for example. The rotary movement of the hybrid hydraulic excavator was achieved by a newly developed electric motor, fuel consumption could be reduced as the result of the speed inhibition when the excavator standby. The modeling of excavator’s hydraulic system, front-end attachments and revolving frame were built on the AMESim platform according to the installation and actual sizes of the hydraulic components. By setting the parameters of every component in the model, mechanical- electronic- hydraulic integrated simulation was achieved. The paper focused on the solutions of hydraulic system’s pressure fluctuation and poor simulation results of front-end attachments. As a conclusion, appropriate solutions and simulation results were proposed to improve the precision.
A Robust Design of SD-PID and BP-PID Simulated Control Model for Brake Designing
Authors: Ma Dan , Huang Ji Da
Published: September 2010

Based on the complexity of brake, this paper simulated the exact relationship between time and motor drive current. According to the principle of robust design, analysis of experimental data obtained the current-driven expression, and on this basis we established PID control model based on system dynamics and BP neural network self-tuning, then, this paper improved compensation for the PID control model, got the computer control method which design the current value this time based on observations of the previous period, simulated the exact relationship between the time and the motor drive current. The energy error from observation of the control simulation is very small, which verifies the correctness of the control method.
Analysis of Fractional Derivative Model for MR Damping System
Authors: Liu Xiao Mei , Huang Yi Jian , Li Hong You , Zheng Qing Juan , Shi Yu Ying
Published: September 2010

A generalized element which has the behaviors both of dashpot and spring is utilized to describe the visco-elasticity of a type of MR (Magneto-Rheological) Damper. A fractional derivative equation of motion which needs 4 parameters is developed to consider the nonlinear characteristics of the MR Damping system. It is demonstrated that the controlling current affects the order of the fractional system significantly, the increasing of the currents lead to the increasing of systemic order, strengthen the influence of viscosity remarkably and weaken the influence of inertia simultaneously. Nonlinear characteristics for shearing thin MRF damping system are also studied.
Gait Recognition Based on Wavelet Descriptors
Authors: Shi Cui Ping , Tao Bai Rui , Miao Feng Juan
Published: September 2010

An efficient gait recognition approach based on wavelet descriptors (WDS) is proposed. First, gait silhouette is described by WDS. Second, the PCA is applied to reduce the dimensionality of the input feature space. Then, the similarity of training samples and test samples is calculated. Finally, sequences matching are used to get the correct identification rate. By utilizing the proposed approach, the experiments made on CMU database have achieved comparatively high correct identification rate. And related experiment results show that, in the same conditions, the correct identification achieved by WDS is generally higher than the method of Centroid and FDS.
The Asymptotical Stability Analysis for Switched Descriptor Systems
Authors: Liu Wei , Lu Zi Yun
Published: September 2010

This paper is concerned with the asymptotical stability analysis for a class of switched uncertain descriptor systems with time-delay. The robustly asymptotical stability of this system is proven by making use of the generalized Lyapunov Stability theory, linear matrix inequality (LMI) tools and multiple Lyapunov function techniques. The conservation of result is greatly reduced by means of introducing the optimal weight matrix and avoiding vector matrix inequality in deducing procedure, in which there is no need of transformation and hypothesis for descriptor systems. The designed control law could surely make switched Descriptor Systems quickly approach the balanceable point. Experimentally, one numerical simulation verifies the effectiveness of this method.
A Speed Regulation System of DC Motor Based on PWM Technology
Authors: Wang Wen Cheng
Published: September 2010

The principles of PWM and Hall sensor have been introduced in this paper. To the defects of traditional methods, it proposed the designing strategy of DC motor speed control system based on single chip microcontroller with integrated circuits, and described the overall framework of the system. The system will generate PWM signals to control the motor accelerating, decelerating and turning, its operating parameters can be obtained through the measurement module and displayed on LCD. Experiment proved that the system has high stability, and it can meet the needs of DC motor speed regulation.
Modified Analytical Expression of Damping Constant in the Hertz Contact Model with Non-Linear Damping for Structural Pounding
Authors: Ye Kun , Fu Rong , Ma Sha Qi
Published: September 2010

Structural pounding under earthquakes has been recently extensively investigated by using different models of impact force. In this paper, reexamination into the Hertz contact model with nonlinear damping is made. Based upon this reexamination, the formula used to determine the damping constant in terms of the spring stiffness, the coefficient of restitution and relative approaching velocity of two colliding bodies is found to be wrong. In order to correct this error, a more accurate approximating formula for the damping constant is theoretically derived. The correctness of the derived analytical formula has been confirmed through numerical simulations.
Based on 3D Technology Application Research about Urban Underground Pipeline Management Information System
Authors: Xu Hong Wen , Zhang Qi Zhi , Li Xin Chuan
Published: September 2010

Urban underground pipeline was an important part of urban public infrastructure, and it was lifeline of cities. Application research of urban underground pipeline management information system also was important to urban underground pipeline manager, and we could manage underground pipeline efficiently when we depended on 3D technology. The paper introduced data model of pipeline network, and introduced how to establish basic 3D objects class of urban underground pipeline management information system. We realized the 3D underground pipeline network and completed the query and network analysis of underground pipeline. Finally the paper provided a preview and conclusion of underground pipeline management information system.
Quality Control and Reliability Analysis of Remanufactured Automotive Products
Authors: Zhang Tong Zhu , Wang Xue Ping , Chu Jiang Wei , Cui Peng Fei , Tian Guang Dong
Published: September 2010

reliability performance is an important evaluation index of product quality, especially for the remanufactured product. Automobile products remanufacturing is an important and effective technology method to develop circular economy in automotive industry. The quality control and reliability problem of remanufactured products are quite different from the original ones. It is necessary to ensure the stability of the remanufactured products qualification in order to eliminate the public bias that remanufactured products are second hand products, and enhance their acceptance and market occupancy. This paper gives the reliability requirements of remanufactured automotive products, points out the factors restricting the quality and reliability, puts forward the reliability performance at the product level and component level, and then introduces the FMEA, failure analysis, their relationship and application in automotive products remanufacturing.
A Revised Serverless Authentication Protocol with Forward Security for RFID
Authors: He Lei , Gan Yong , Li Na Na , Zhang Tao
Published: September 2010

Information security problem has become one of the hottest issues in RFID system. More and more researchers begin to study how to provide security protection in the RFID system. In the paper, we mainly research lightweight authentication protocols in RFID system. Firstly, we analyze some protocols. Secondly, we introduce a serverless authentication protocol for RFID system and analyze its security. We find it does not provide forward security. Thirdly, we propose a revised serverless authentication protocol with forward security. It provides two-way authentication and privacy protection, resists tracking and cloning attack as well as the original protocol. Moreover, it provides forward security protection and resists desynchronization attack. For the efficiency, its computational complexity is at the same level with the protocol proposed by Tan et al.
Research on Design and Testing of a Novel Power Source for Hybrid Vehicles
Authors: Shi Yan , Chang Si Qin
Published: September 2010

In auto industry extensive use of traditional IC engines and fossil fuel as power source has lead to serious environmental problems and social issues. Development of hybrid vehicles is a hopeful technology to solve above problems. As a vital part of IC engine-electric hybrid vehicles, power source should generate electricity efficiently. Supported by National High-tech R&D Program (863 Program) a novel Internal Combustion Linear-Generator Integrated Power System (ICLG) is researched in this paper. ICLG mainly consists of four-stroke free-piston engine, linear motor, reversible electrical energy storage device, and control unit and has the potential to convert the chemical energy of fuel to electrical energy efficiently. Achievements for improving efficiency, such as minimizing the energy transmission and conversion link, movement control of piston by adjusting electromagnetic force, optimization of thermodynamic cycle, and sub-cylinder or sub-cylinders mode, are analyzed and validated by testing. Testing results show that the generating efficiency is about 32%, which can be improved by further study. ICLG is hopeful to be the new generation power source of hybrid vehicles which has the character of power saving and environmental protecting.
Research of H.264/AVC Error Control Approaches Base on FMO
Authors: Hu Lin Na , Sun Yu , Jiang Yi Feng
Published: September 2010

In order to reduce the channel errors influence on the decoding quality, the H.264/AVC uses a series of effective error- handling mechanism. This paper introduces error control technology in H.264/AVC, and focused on the FMO. On this basis, error pattern are used to simulate of the FMO, and the quantificational performance of the FMO will be given out.
Application of the LMI Approach in the Robust Force Control of Servo-Hydraulic Actuator with Parametric Uncertainties
Authors: Chen Nai Chao , He Ping , Yu Xia
Published: September 2010

Linear matrix inequalities (LMI) method is proposed to design the robust controller for the servo-hydraulic actuator with parametric uncertainties. The pretreatments are adopted to convert the nonlinear dynamic models into linear state equations using the linear fractional transformation (LFT) approach, which facilitates conveniently utilizing the LMI method to calculate the state feedback controller. The supervising parameters, including the system output and special derivative output generated from the uncertain items, are proposed to model a state matrix equation for representing the dynamic system with the parameter variations and disturbances. LMI control base on the H∞ control schematic is finally employed to carry out the state feedback controller for the servo-hydraulic actuator with parametric uncertainties. The results demonstrate the efficiency of dynamical performance with small settling time and overshoot compared with the quantitative feedback theory (QFT) approach.
Parametric Modeling Technologies of the Advanced Actuator
Authors: Zou Chang Ping
Published: September 2010

Actuator is a kind of rotary mechanism whose power source is the hydraulic pressure oil, which demands that the ratio of torque to deadweight is big ,and efficiency is high ,and reliability is great. On the base of ball helical transmission, this paper puts forward a new type of actuator ,the advanced actuator, which possesses several advantages, such as the ratio of torque to deadweight is big , transmission efficiency is high , impact is minuteness, life span is long, reliability is great, satisfying the demands of an advanced aircraft. This paper mainly introduces the working principle of the new type of actuator, 3D parametric modeling technologies of key parts.
Torsional Rigidity of the Advanced Actuator
Authors: Zou Chang Ping
Published: September 2010

System torsional rigidity is an important design index, having important influence on operating performance of the advanced actuator; therefore, this paper emphasizes the study on calculation of system torsional rigidity. This paper firstly introduces working principle and structural features of the novel ball screw transmission. Then uses commercial CAD and FEM softwares, SolidWorks and Cosmos/Works, fulfils deformation analytical computation for such three key parts as driveshaft, fixed guiding sleeve and straight-rotary sleeve. Next, sum up each term of torsional rigidity. Finally, makes a conclusion that the system torsional rigidity of the advanced actuator satisfies the designing demand.
Research on Soft Switching Power Supply with High Power Factor Based on Boost Converter
Authors: Xiao Qian Hua , Liu Hai Jing
Published: September 2010

With the development of power electronics，the technology of Switching Mode Power Supply(SMPS) is gradually perfected. However，there is no end to the demand for a high power and high performance power supply. Nowadays, Power Factor Correction (PFC) technique is widely researched. This paper mainly analyzes the fundamental configuration of the switching power supply. And we study the basic structure and the operating principles of ZVT-boost soft-switching PFC circuit and the implementing principle of soft switch. For the power requirements, the two-stage PFC circuit is used. The forward stage is a single-phase Boost Power Factor Correction circuit and the backward stage main circuit is a full-bridge converter with the phase-shifting control soft-switching technique. Finally the simulating analysis is performed to the designed system.
An Improved Synchronization Mechanism of SERCOS III in Strong EMI Environment
Authors: Hou Chong Yuan , Jiang Han Hong , Yang Yuan , Rui Wan Zhi , Hu Lian Wu
Published: September 2010

Strong EMI (Electro-Magnetic Interference) brings the problem of packet error and following retransmission. Especially in motion control area, the widely used Real-Time Ethernet SERCOS III will be seriously affected by EMI from the motor and other power electronic devices. This paper focus on the behaviors of synchronization mechanism of SERCOS III in a strong EMI environment. Strong EMI affect the precondition of SERCOS III’s synchronization mechanism, and the precision of synchronization is highly affected. A Timed Petri Net model of the former mechanism in packet error environment is created and simulated in the Timed Petri Net simulation software CPN TOOLS. The simulation results indicate that the synchronization error is up to about 0.5 to 45 times of retransmission cycle time. This error is unacceptable in motion control area. Then, the paper provides an improved synchronization mechanism, and similar simulation is run. Simulation results indicate that synchronization error is eliminated by the improved mechanism.
Design of a Single Phase Power Factor Corrector
Authors: Zhang Hou Sheng
Published: September 2010

This paper designs a novel single phase high power factor rectifier with IR1150 as its main control chip, which main circuit uses boost topology. The fundamental principle of the proposed rectifier is introduced. The IR1150 control IC based on one cycle control is intended for boost converters for power factor correction operating at a fixed frequency in continuous conduction mode (CCM). The use of the IC will make the PFC circuit design easily, the volume of the rectifier small and the efficiency enhancing. The modules of the proposed rectifier such as current loop and over-current protection, voltage loop and over-voltage protection, soft start, and so on, are analyzed and designed respectively in detail. Experimental results of the designed 600W prototype prove that the boost high power factor rectifier designed is rational and reliable, its power factor can reach 0.994.
Application of Optimal Control in Inventory Management of Production
Authors: Sun Pei Hong , Tang Lei , Tang Li Ying
Published: September 2010

Countering the inventory management problem of manufacturing enterprise, according to the optimal control theory, considering the numbers of products as control variables and the stocks as the state variables, this essay establishes systemic real-time dynamic model, gives the objective function, and makes use of dynamic programming method to solve the optimal control and obtains the optimal inventory, which provides a theoretical foundation for the production and inventory management of manufacturing enterprise.
Research and Application on QFD Based on Fuzzy Analytic Hierarchy Process
Authors: Gong Li Xiong , Tang Liang , Yang Ming Zhong
Published: September 2010

Quality Function Deployment is a quality assurance method that user-driven and meeting customer demands mostly in process of product development and design. It is emphasized to ensure requirements and measures of quality. And Fuzzy Analytic Hierarchy Process considered vague language of judgment matrix can overcome the subjectivism and one-sidedness considered of Analytic Hierarchy Process. Approach of Fuzzy Analytic Hierarchy Process is applied to model Quality Function Deployment in an example of small ERP software development in the study.
The Information Organization of Digital Library Based on Network
Authors: Ji Zhi Gang
Published: September 2010

This paper discussed library under the network environment of the movement and the development. Digital Library will be understood as a new information environment is a more broad definition. The mandate of the Digital Library will focus on building a network of resources and resource organizations, the number of objects a unique identifier, metadata interoperability, digital resources, such as opening up links.
Experimental Study of Stress-Generated Potentials on Large Cattle Femur under Simulated Physiological Loading State
Authors: Wu Xiao Gang , Chen Wei Yi
Published: September 2010

Under simulated physiological loading state (walking and running), cattle femur’s SGP was tested by INSTRON (8847) tester. Strictly speaking, the specimen was a large bone structure. Experiment results imply that human femur will also have voltage signals under the state of walking and running, and the voltage amplitude will become larger with the load and frequency increases. In addition, running’s voltage amplitude is larger than that of walking.
A Modified Gene Optimization for TSP
Authors: Wu Cheng Ming , Chen Peng , Yang Yong
Published: September 2010

The genetic optimization (GO) is employed to solve the Traveling Salesman Problems (TSP). Instead of the global fitness of the individuals, it calculates the local fitness of each gene in GO. Based on the local fitness, worse gene are selected and modified for better fitness. With the improvement of local fitness, the global fitness is improved. The algorithm is implemented for well-known benchmark cases, and the simulation results have shown the infeasibility and effectiveness of the algorithm.
Ontology-Based Representation of Heterogeneous Mechanical Systems Information for Integrated Diagnostics
Authors: Chen Z.S. , Yang Yong Min , Song L.J.
Published: September 2010

During fault diagnostics of mechanical systems, information fusion methods were widely used to improve the reliability. However, diagnostic information comes from all life cycle of a mechanical device and they are always heterogeneous. Whereas heterogeneous information is difficult to be interconnecting, intercommunicating and inter-operating, so how to represent heterogeneous information is a key problem in integrated diagnostics. In this paper, a novel ontology-based representation method of heterogeneous diagnostic information is presented in detail. Firstly it introduces basic principles of ontology-based modeling. Then three methods of ontology-based information modeling are studied respectively. In the end an example of ontology-based modeling for a diesel engine is given.
STEP-Based Feature Modeller for STEP Compliant CNC
Authors: Shu Qi Lin , Sun Ai Xi , Gong Guo Bin
Published: September 2010

Feature-based modeling is one of key technologies to implement intelligent STEP compliant CNC, which can associate not only geometric and topological information, but also form features, tolerances, material properties and other information which may be used during the process planning and STEP-NC machining. This paper presents a machining feature-based modeler to build parts and exports them as the format of STEP AP224 file. The modeling system provides three main steps to construct a part: (1) selection of raw stock form stock library, (2) selection of predefined machining features according to ISO14649 to be subtracted from the part being designed, and (3) providing information to define the machining feature attributes such as feature size, position, orientation etc. This feature-based modeling system is implemented by using Microsoft C# and NX Open technology in UG NX6.0 environment.
Research on Forecasting Method Based on Genetic Algorithms and Support Vector Machines
Authors: Xiao Cheng Yong , Guo Peng Yan , Feng Zhi Peng , Deng Yong Sheng
Published: September 2010

State forecast of machine using support vector machines has good generalization ability in situation of rare samples. Appropriate parameter selection is very crucial to the learning results and generalization ability of support vector machines. In addition, embedding dimension influences the phase space reconstitution of nonlinear systems, as well as the precision of machine state forecasting. In this paper, an approach to optimize the parameters of SVM and the embedding dimension based on genetic algorithms was proposed. The proposed model is applied to the tendency forecasting of the vibration of shovel electric drive system. The results show that it can avoid blindness of manually selection of parameters and meanwhile improves the prediction performance greatly.
Creep Characteristics Analysis of Oil Shale and its Application
Authors: Wang Jun Guang , Liang Bing
Published: September 2010

to study oil shale creep properties, we use rock SJ-1B three-axis creep instrument on oil shale to carry three axis creep test. Through test results, the creep of oil shale is nonlinear, and in accelerating creep stage oil shale injury increased dramatically. Using Burgers creep model introduced damage variable to analyse the oil shale surrounding stress and displacement field and Systematically analyse the creep properties under various support intensity. So it has important theoretical significance and value for the oil shale resource development and roadway stability control.
Bioinformatic Analysis of Chitin Deacetylase in Rhizopus oryzae
Authors: Li He , Zhang Huai Yun , Zhou Guo Ying , Liu Jun Ang , He Yuan Hao
Published: September 2010

Rhizopus oryzae is the most common causative agent of zygomycosis and has a world-wide distribution with a high prevalence in tropical and subtropical regions. Chitin deacetylase acting on carbon-nitrogen bonds other than peptide bonds, specifically in linear amides. In the present study, some characters of the amino acid sequence of Chitin deacetylase of R.oryzae were predicted and analyzed with the tools of bioinformatics. These results showed that the protein was composed of 20 kinds of amino acid; the theoretical pI of Chitin deacetylase was 5.03 and the theoretical molecular weight of Chitin deacetylase was 49177.9 Da; total number of atoms was 6786; the extinction coefficient was 108665(280 nm).The N-terminal of the sequence considered was M (Met) and the estimated half-life was 30 hours. The instability index (II) was computed to be 32.67. Aliphatic index was 67.91. There were 20 glycosylation sites,a signal peptide and conserved domains. It was a hydrolase.
Application of Convolution Code in CCK Modulation Technology
Authors: Su Xi , Bai Peng , Feng Yan Ping , Wu Yuan Yuan
Published: September 2010

Adopted by IEEE802.11b standard as the high speed expanding scheme, CCK modulation technology performs well in error probability with high signal noise ratio. However, the CCK system’s error probability soars when SNR is comparably low or the number of users in the same channel increases suddenly. Based on CCK algorithm and convolution code’s structure, this paper analyzed code parameters’ influence on error probability and proposed a channel coding scheme suitable for CCK modulation: convolution code （2,1,7）with 3bit soft decision decoding. Simulation Results demonstrated that system performance is greatly improved when SNR is upon 1.3dB and 2dB’s additional coding gain is attained compared with hard decision decoding.
Fractal Geometry Based Mathematical Model and Simulation of Permeability of Dehulled Rapeseed Cake
Authors: Zheng Xiao , Wang Jing Zhou , Lin Guo Xiang , Wan Nong , He Don Ping
Published: September 2010

In view of the fact that dehulled rapeseed cake formed under cold pressing condition is a fractal structure, the relation between the permeability and the pore fractal dimension of dehulled rapeseed cake has been investigated using fractal geometry. The microstructures of dehulled rapeseed cake under six pressing pressures are measured by using scanning electronic microscope and Image-pro image analyzer. The fractal dimensions of pore size distributions are measured by the box-counting method. Combining Hagen-Poiseulle equation with Darcy’s law for flow of fluid through porous media, the relational expression of fractal dimension and permeability has been developed to predicate the permeability of compressed dehulled rapeseed cake under cold condition. The permeability experiments of dehulled rapeseed cake are also carried out in order to validate the predication model proposed in this study. The value of mean relative error is 15.5%. A fairly good agreement is obtained in the case of high pressing pressures.
Pattern Recognition of Group Control Object Based on Fuzzy Neural Network
Authors: Li Huo You , Li Jian Jun , Li Jian Yang
Published: September 2010

This paper has proposed a concept of Group Control Object, taking an example according to experimental data of elevator group control object of a building; we apply fuzzy logic and neural network to recognize the pattern of the group control object. With the aid of the fuzzy neural network, this task designs to identify the different passenger flow, and classify it into the six models such as the up-peak service model, down-peak service, two way traffic model, four way traffic model, the balanced bi-story traffic model and free duty traffic model. Then it constructs five-level fuzzy neural networks to apply the classification to the elevator group control, and perform the best group control strategy for each model.
A Scalable Routing Architecture for Next Generation Gatekeeper Independent of Service Domain
Authors: Zeng Wu , Yuan Xi Wu
Published: September 2010

In traditional gatekeeper architectures, call routing has many drawbacks such as long call setup delay, heavy burden on gatekeeper, low channel utilization and lack of scalability. We propose a scalable routing architecture for next generation gatekeeper, which is independent of real-time services plane. The design principle is gatekeeper call routing may be separated from its call process. Next generation multimedia networks, which feature with large capability and multi-domains, consist of Connecting Domain for call routing and Service Domain for call process. Next generation gatekeeper is the important entity in Connecting Domain, adopts Telephony Routing over IP to realize dynamic routing. We consider this routing as a special type of service and investigate the method of routing creation and routing provisioning. Validation in a testing platform shows that the proposed routing architecture can provide admirable routing performance. It also goes through stress and capability test. So it is a better choice for multimedia communication system with flexible extension and network cost saving.
Mathematical Mechanism and Numerical Study of Volatilization Combustion during Coalfield Fire
Authors: Qu Zhi Ming
Published: September 2010

A physical model on the volatilization combustion of coal field fire area was established based on its characteristics. The quality exchange equation, momentum equation, diffusion equation and energy equation with the thermal and quality exchange, with the chemical reaction and multi¬-composition flow was analyzed by analytic geometry method. The parameters of volatilization combustion speed, the content of the volatile component and the flame temperature was gained at relatively still high temperature environment. According to the result, the flame temperature of the volatilization combustion of coal field fire area is the heat insulation temperature calculated based on the low-heat value of the volatile component. In the actual fire area, because of the free or forced convection, the true temperature would be lower than in the calculation. The numerical simulation reveals the airflow distribution of static pressure of coal outcrop. The difference between static pressure and dynamic wind pressure changed with a high degree of change is proposed. The variation of gas transfusion direction and velocity in the coal outcrops and the transfusion depth between static and airflow is analyzed near the coal outcrop.
Camera Calibration with Neural Networks
Authors: Tian Zhen , Xiong Jiu Long , Zhang Qi
Published: September 2010

As the existence of the many unwanted factors, such as radial distortion and decentering distortion, the model of camera imaging is actually a nonlinear one. In order to successfully realize this kind of nonlinear mapping relationship between the 3D object points and their corresponding 2D image points, neural networks were and are still used. This paper introduced the history of camera calibration with neural network, covered the three types of neural network algorithms that have been used in camera calibration and explained their advantages as well as drawbacks with experiment results. After that, two issues that should be noted before and after the use of neural network were discussed and finally, the concluding remarks were gained.
Research on High Strength Aluminum Alloys Components Stress Analysis by Lock-In Thermography
Authors: Liu Xun , Liu Jun Yan , Dai Jing Min
Published: September 2010

This paper describes a theoretical and experimental analysis on full-filed stress distribution from thermoelastic measurements and its application to determination of stress concentration. The sum of the principal stress can be measured by Thermal Stress Analysis (TSA). Lock-in Thermography has been applied to measure the sum of principal stress distribution of component structure by its high thermal resolving. In this study, Finite element method is used to calculate the sum of principal stress distribution, and the thermoelastic effect model is developed to study the relationship between the temperature deviation and the applied stress in an elastic material. Experiments were carried out with ANSI 7071 high strength aluminum alloys ply and ones with a crack under cyclic load. The thermoelastic constant is obtained for ANSI 7071 high strength aluminum alloys materials. The stress concentration factor is calculated for a ply with modeling crack under the condition of different loads. The experiment was carried out with high strength aluminum alloys component structure with rivet joints. The experimental results show the stress distribution can be measured and analyzed the contact stress distribution between ply and rivet by using Lock-in thermography. It was found that the structure stress can be evaluated with good accuracies by the lock in thermography.
Cause Analysis and the Counter-Policies for Ecological Environment Problems of Coal Resource-Based Cities
Authors: Qi Quan Song
Published: September 2010

This paper analyzes the ecological environment problems from the deeper causes of concept, system, industrial structure, city planning layout, preventive measure, etc. And it proposes the implementation countermeasure of ecological environment sustainable development from the perspective of structural models of coal resource-based cities’ ecological environment sustainable development.
Hierarchical ANFIS Identification of Magneto-Rheological Dampers
Authors: Wang Hao , Shi Xiao Mei
Published: September 2010

Magneto-rheological (MR) dampers, recently, have been widely utilized in many different areas of engineering for their high properties. There are two different kinds of problems for MR dampers, the direct model and the inverse one. It is difficult to express of the direct model of the MR damper for its high nonlinearity and hysteretic characteristics. It is much more difficult to get the inverse model of MR damper, which means the determination of the input voltage so as to gain the desired restoring force decided by the control law. When identifying the direct and the inverse model of MR damper with Adaptive Neuro-Fuzzy Inference System (ANFIS), there exists curse of dimensionality of fuzzy system. Therefore, it will take much more time, and even the inverse model may not be identifiable. The paper presents a hierarchical ANFIS to deal with the curse of dimensionality of the fuzzy identification of MR damper and to identify the direct and the inverse model of MR damper. The numerical simulation proves that the proposed hierarchical ANFIS can model the direct and the inverse model of MR damper much more quickly than ANFIS without more changing of identification precision. Such hierarchical ANFIS shows the higher priority for the complicated system, and can also be used in system identification and system control for the complicated system.
Level Set Based Mesh Model Simplification
Authors: Liu Xue Shu
Published: September 2010

Geometric models often contain small features that we would like to remove, including small extrusions and holes. Feature removal can be desirable for many reasons, including finite element simulation, analysis of feature purpose and so on. In this study, an algorithm based on level set method is proposed to remove the small features. First, we initialize the zero level set in such a way that the zero level set includes the input model. And then the zero level set evolves towards the input model based on a novel speed function. When zero level set stops moving, a simplified model without small features can be got. The method receives approval from the experimental results.
The Chaotic Motion of an Axially Compressed Cylindrical Shell Subjected to Radial Disturbance
Authors: Zhang Tao , Zhang Shan Yuan
Published: September 2010

Using the logarithmic hoop strain，a nonlinear dynamic equation governing the axisymmetric radial motion of an axially compressed cylindrical shell subjected to radial disturbance is derived. By means of Bubnov-Galerkin approach the partial differential equation can be transformed into an ordinary differential equation containing second-order nonlinear term. The qualitative analysis indicates that the autonomous dynamic systems corresponding to two cases of pre-buckling and post-buckling has the form-same homoclinic orbits and two orbits locate different positions on the horizontal axis of phase plane. The threshold condition for the occurrence of Smale horseshoe-type chaos in disturbed system is obtained by Melnikov’s method. Finally, the bifurcation diagram, time-history curve, phase portrait and Poincare’s map are calculated.
Measurement and Analysis of Time-Temperature-Transformation Curves of Boron Steel 22MnB5
Authors: He Lian Fang , Zhao Guo Qun , Li Hui Ping
Published: September 2010

Hot stamping of quenchable boron steels is a new and complex forming technology integrating metal hot forming and quenching process. In order to gain the Time – Temperature - Transformation (TTT) curves of 22MnB5, the phase-transformation temperatures of boron steel 22MnB5 are measured by DIL 805A/D quenching and deformation dilatometer. According to the expansion curves of phase-transformation at some constant temperatures, the start and finish temperatures of phase-transformation are calculated by using the expansion method and the tangential method. The types of metallographic phases after phase-transformation are judged by the optical microscope and micro hardness. The TTT curves of 22MnB5 are drawn in terms of the results of testing and calculating.
Study on Fracture Characteristics of Concrete by White Light Digital Image Analysis in Frequency Domain
Authors: Yang Xin Wei , Jin Xiu Mei , Tian Rui Lan
Published: September 2010

White light digital image analysis in frequency domain has the characteristics of whole-field, non-contact measurement. The measuring system of this method is very simple and the coherent light is not demanded. Gray images before and after deformation which are recorded using CCD camera, digitalized and then analyzed by frequency domain correlation arithmetic can be used to obtain the displacement information. This method is used to study the fracture characteristics of concrete and measure the stress intensity factor of I type crack tip. Comparing the experimental results and theoretical values of the stress intensity factor of I type crack tip, the applicability of this method was certified, which shows that this method is very proper to study the deformation and fracture characteristics of concrete.