bluuebunny/crossref_metadata_2025 huggingface dataset:
Analysis of the Interaction between Modes by Normal Forms and Singular Perturbation Theory
Authors: Zhang Jing , Jiang Ting Ting
Published: February 2012

Due to the nonlinear characteristics of modern power systems, strong interaction between system angle stability and voltage stability will present. However, because of extreme complexity, these two kinds of stability are often investigated separately and the interactions between them are normally neglected in traditional studies. In this paper, a new method based on the theory of normal forms of vector fields and singular perturbation theory is introduced to deal with the power system structure preserving model for system stability modes interaction analysis. The relationship between angle and voltage stability is discovered. The method is validated with a sample power system.
Motion Analysis & Simulation of Cloth Rolling Machine
Authors: Wu Cong Min , Zhang Qing
Published: February 2012

Virtual prototype technology as a new design means, is applied in engineering design and mechanical system performance more and more. In this paper, the change rule of the speed of cloth rolling machine was inferred according to the work principle of the machine. And then the model of the cloth rolling machine was designed, and imported it into the ADAMS software. At last, have a simulation analysis of the cloth rolling machine with the ADAMS software. From the simulation analysis can know that the characteristic of motion of the cloth rolling machine is reasonable.
Data Association Method for Radar Network Based on Time Restraint
Authors: Wang Shen Shen , Che Wan Fang , Feng Jin Fu , Wang Fang Nian , Bai Yun
Published: February 2012

Data association is one of the most important issues in multi-target tracking for radar network. In order to meet the high real-time requirement of the multi-target tracking system in the future, a data association method based on time restraint is presented. Firstly, the modified association probability matrix between the observations and tracks is calculated, and the optimal association model is established. Then, the time restraint based auction algorithm is proposed to solve the association issue. The design and flow of this algorithm is offered, and the simulation of the method is designed. Simulation results demonstrate that the proposed method has an ideal association performance in the restrained time.
Research of Localization Issues in Underwater Sensor Networks
Authors: Wei Xian Min
Published: February 2012

Localization problem has great significance in the applications of underwater sensor networks (UWSN), such as real-time monitoring, target tracking and navigation. This paper analized a series of challenges in underwater localization problem, introduced exsiting localization algorithms and discussed their advantages and disadvantages, and then the development trend of localization problem is discussed. Finally, we give some suggestions in the design of localization algoprithms.
Analysis and Design of Electric Energy Consumption Inspection Equipment Based on ARM9
Authors: Hu Hu , Tian Xin , Han Li Hong , Chen Bin
Published: February 2012

The present paper introduces a sort of analysis and design of electric energy consumption inspection equipment based on ARM9, which can inspect multiple electric energy indexes and conduct a real time inspection to electric energy consumption. Both a real time collection and a real time transmission of electric energy consumption data are realized and a real time analysis of these data that are transmitted through the network to the host computer can be carried out as well, the features of which are low power consumption, low cost, very applicable, high real time performance, etc. The paper also describes the system’s basic structure, hardware design, software design and system debugging process.
Product Information Representation Method for Product Conceptual Design Based on Improved Meta-Model
Authors: Xu Zhen Yu , He Bin
Published: February 2012

Product conceptual design is a problem-solving activity based on knowledge engineering. Information model of product conceptual design includes functional knowledge, effect knowledge, principle solution knowledge and their relationships. This paper is devoted to presenting a general product information processing method for product conceptual design based on improved meta-model. The representation of product function, domain, relationship, behavior, structure, property based on the above meta-model are proposed step by step. The methodology is obviously helpful for product innovation.
Control System Design of Automatic Feeding Machine
Authors: Chen Shao Ke
Published: February 2012

The research of the control system of automatic feeding machine in the present paper can be applied in different mechanical designs – from simple key-press input of cycling days, multiple time intervals and the feeding amount to setting steps of numbers of stepping motor via the control of SMC by time setting. This not only realizes the objective of “fixed-time” and “fixed-quantity” feeding, but also solves the problems of serious leaking, high failure rate, and loud noises during the process of using warehouse-type feeding machines, which brings favorable economic and social benefits for enterprises.
Comparison of Adomian Decomposition Method and Differential Transformation Method for Vibration Problems of Euler-Bernoulli Beam
Authors: Liu Zhifeng , Guo Chun Hua , Cai Li Gang , Yang Wen Tong , Zhang Zhi Min
Published: February 2012

In this paper, we compare the Differential transformation method and Adomian decomposition method to solve Euler-Bernoulli Beam vibration problems. The natural frequencies and mode shapes of the clamped-free uniform Euler-Bernoulli equation are calculated using the two methods. The Adomian decomposition method avoids the difficulties and massive computational work inherent in Differential transformation method by determining the very rapidly convergent analytic solutions directly. We found the solution between the two methods to be quite close. According to calculation of eigenvalues, natural frequencies and mode shapes, we compare the convergence of Differential transformation method and Adomian decomposition method. The two methods can be alternative ways to solve linear and nonlinear higher-order initial value problems.
Structural Optimization Design of Parallel Piezoelectric Six-Component Force Sensor
Authors: Wang Gui Cong , Li Ying Jun
Published: February 2012

This paper describes structural optimization design of parallel piezoelectric six-component force sensor. Structure, measuring principle, and load sharing principle are introduced. The influences on load sharing effect of each component of sensor’s structure are researched. Main parameters to influence load sharing effect are obtained, and analyzed by finite element method (FEM). It is clear that the analysis results of FEM are well correspond with the theoretical analysis results. Experiment is designed to verify analysis results. The trend is in consistent with FEM analysis.The paper provides reference basis for design of parallel piezoelectric six-component force sensor.
Research on Modeling and Simulation of Active Disturbance Rejection Controller for Gas Turbine
Authors: Jiang Jun Peng , Zhang Qing , Wang Le Ping
Published: February 2012

In this paper, a novel control approach is presented for a gas turbine. The approach is based on the active disturbance rejection concept, which can design an Active Disturbance Rejection Controller (ADRC) without an explicit mathematical model of the plant. The controller regards the friction and the coupling effects of several main subassemblies as the internal disturbance. And it can estimate and compensate the disturbances using the Extended State Observer (ESO) in the each sampling period. Hence ADRC is robust against the variations of plant. Using the parameters of turbine engine Titan 130 the simulation was developed. Through the results of simulation, it is verified that the proposed approach is superior to the classical PID regulator in maintaining the stability.
Rough Properties of Rough Graph
Authors: He Tong
Published: February 2012

Based on the definition of rough graph, this paper makes further research on rough properties of rough graph. The concept of edge precision is presented to measure rough properties of rough graph. Furthermore, by using rough equal and rough similarity degree, different rough graphs are compared. Some basic conclusions are presented.
A Semi-Anonymous Non-Contact Offline Mobile Payment Protocol Based on Concurrent Signature
Authors: Wang Xin , Yuan Chao Wei , Fu Wei
Published: February 2012

A new semi-anonymous non-contact offline mobile payment protocol based on improved concurrent signature is proposed. The customers can keep anonymous to merchants during the regular transactions. However, the merchants can obtain customers’ identity information in questionable tractions from the issuer offline without supervision of a third party. The offline transaction needs two interactions and its benefits include fairness, high efficient and no third party. The new protocol’s fairness has solved the anti-pull problem in offline non-contact mobile instant payment.
A Time-Frequency Filtering Method Based on Generalized S Transform and its Application in Machinery Fault Diagnosis
Authors: Li Xiu Wen , Yang Jian Hong , Li Min , Xu Jin Wu
Published: February 2012

Aimed at the problem of low resolution and cross term interference of the traditional time-frequency analysis methods, a new time-frequency filtering method based on generalized S transform is proposed. The method is extended under the premise of the linearity, lossless invertibility, high time-frequency resolution of S transform. On the basis, a coefficient which is direct to the signal energy distribution is introduced. In this way, the resolution of the S transform can be adjust adaptively. Eventually, this method is applied to the time-frequency filtering. The results of simulation and faulty bearing show that the proposed methodology can achieve good effect of noise reduction, and be more suitable for the non-stationary characteristics of vibration signals.
Method of Spray Gun Path Generation Based on Z-Map Theory
Authors: Wang Zhan Zhong , Liu Chao Ying , Cheng Lin Zhang , Fan Xiao Ke
Published: February 2012

As an advanced painting equipment, the spray-painting robot has been widely used in product painting. For the shape complexity of modern product, how to make the coating uniform has become an extremely important problem. In this paper, based on Z-map theory and the free surface’s CAD model, the free surface is fragmented into polyhedron model, and then the coordinate information and normal vectors of the painting node under the condition of equidistance painting are exacted with MATLAB program. At the end, with those coordinate information & normal vectors, the spray gun path for a random free surface could be generated and simulated automatically. Finally, based on the 3D model setup with Pro/E software, the spray gun path for a car body’s top area is generated and simulated.
Centrifuge Rubber Suspension Spring Characteristics of the Experimental Research
Authors: Ren Lan Zhu , Liu Li , Ren Zheng Chi
Published: February 2012

This article has carried on the description about characteristic of rubber damping spring. According to different pressure and different temperature, The paper has carried on analysis using both static and dynamic test method. Obtaining the conclusion that the pressure change has little effect on the shear stiffness of rubber spring in positive pressure conditions,. Environmental temperature on the performance have larger effect. Therefore, we should carry on temperature test in the use of rubber elasticity components to ensure that the rubber spring meet the requirements in a certain temperature range
Optimized Processing in IMU-Aided GPS Signal Tracking
Authors: Zhao Lin , Hao Yong , Guo Li Shu
Published: February 2012

A GPS signal tracking method utilizing optimized processing in inertial measurement unit (IMU) aided GPS receiver is studied. In order to enhance the sensitivity of baseband processing, low-cost inertial sensors are applied in the GPS and strapdown inertial navigation system (SINS) integration commonly, where the estimation accuracy of Doppler frequency would influence the whole performance of the tracking loops. Stochastic errors of carrier Doppler estimation caused by inertial sensors and local oscillators are corrected utilizing auto regressive moving average (ARMA) method in this paper. And then the accuracy Doppler information is used to correct the local code phase and local carrier frequency to further determine the search space of frequency domain which is unlike to the design of traditional aided loop. Simulation results indicate that the bandwidth of carrier loop and code loop could be decreased significantly in high dynamic environment.
Study on the Principle of Reasonable Modeling Based on NX
Authors: Li Xiao Da , Zhan Xiang Hui
Published: February 2012

The principle of reasonable modeling method using NX software was studied. The two modeling modes including history mode and history-free mode of NX were introduced. It was important that 3D model was created in reasonable method, so it was easy to modify the model and reduce the possibility of error when it was updated. The method ensuring relativity and parameterization of model by choosing correct modeling strategy was expatiated. In the end, the process of reasonable model creation is analyzed through a practice case.
Modal Analysis of Three Rotating Blades of Large Wind Turbine
Authors: Hu Guo Yu , Sun Wen Lei , Wu An , Xu Yan
Published: February 2012

Abstract: Based on the Multi-body dynamics, the dynamics equation of the flexible blade in wind turbine is established by discretizing the rotating blade using finite element method. The simulation analysis of the single blade and the vibration modes of a 5MW wind turbine rotor are carried out by MATLAB. The first six natural frequencies and modes of the single blade and the rotor are figured out, and whose results are analyzed. The simulation results indicates that the coupling effect of the rotor can lead to dynamic stiffening. In comparison to the results in FAST, these simulation results show an outstanding agreement with the results calculated by FAST and hence approve the simulation method is valid and meanwhile give reference for large wind turbine design and running.
Development and Validation of a Thermodynamic Model for Predicting Traffic-Related Pollutants Dispersion in Urban Street Canyons under Low Wind Speed Conditions
Authors: Gao Guo Hua , Liu Jing , Ma Fei , Luo Wei Dong
Published: February 2012

To study the thermal effects on pollutant dispersion in the street canyon, a thermodynamic model is developed in this paper to predict surface temperature in street canyon environment, which can offer boundary conditions for CFD model. This model considered the shielding effect of buildings on solar radiation, the multi-reflection of radiation between building surfaces and the road. Furthermore, sensible heat exchange between the canyon space and the overlaying atmosphere was also modeled based on the classical theory of dynamics of atmospheric boundary layer. The reliability of this model is validated through a field measurement. Based on the thermodynamic model, a coupled calculation method is presented to predict traffic-related pollutants dispersion in urban street canyons under low wind speed conditions.
Model Parameter Identification of Tire Dynamic Balance Detection System
Authors: Yang Jing Fang , Feng Xian Ying , Fu Hong Jun , Mu Shi Gang
Published: February 2012

Tire dynamic balance detection plays an important part in tire quality detection area. An accurate model structure and precise model parameters are the basis of the right test results. This paper builds a kinetic model based on engineering practice. To acquire parameters presents a method following identification theory. According to the need of actual production, a validation experiment is put forward. In the parameter identification process, data acquisition is completed by the PCI card. For data processing, this paper designs the fitting filter and then it also fetches the signal amplitude and phase with discrete Fourier transform. The results are proven to be right and practicable.
Reliability-Based Robust Design of Variable Cross-Section Wedge Beam
Authors: Zhang Tian Xiao , Liu Xin Hui , Liu Qiao Ling
Published: February 2012

Variable cross-section components are widely used in engineering practice. The paper discussed the reliability analysis, sensitivity numeration and robust design for variable cross-section components obeying normal distribution, built up the reliability-based robust design model, propose a method discussing reliability-based robust design of variable cross-section wedge beam. According to the numeration, obtain the graph of reliability index and reliability of variable cross-section components, obtain the method designing reliability-based robust of variable cross-section components with the certain reliability index.
Research on Displacement Compensation Algorithm of Tactile Sensor on the Beating Heart
Authors: Yang Sheng Yi , Gu An , Li Meng , Lu Chang Jian
Published: February 2012

In robot-assisted surgery system, the method of compensating the relative motion between the surgical site on the heart and the surgical instruments was introduced by using tactile sensor in this paper. Three-dimensional space coordinate systems were established, including the world coordinate system, surgical instruments and tactile sensor coordinate system. Space coordinate was transformed between the three coordinate systems through the way of mathematical theory. Compensation algorithm theory formulas about the beating heart were derived, including the rotation matrixes of the coordinate system, the equations, etc. According the data of the tactile sensor, the relative displacement of the surgical instruments coordinate system was calculated compared with the world coordinate system. Finally, Conclusion is obtained by compensation example analysis.
Design the Economical Engraving Machine for Wood
Authors: Liu Ying , Gou Bin Li , Xu Zhao Jun
Published: February 2012

Nowadays with the improvement of people’s lives in China, furniture industry has a sustainable development. Different kinds of engraving machines are required to design and manufacture. This paper is to give the example of the process for designing the economical engraving machine. Firstly, take the DK5040 as an example, the need was supplied and the main design parameters were given. Secondly, to complete the quick design, the architecture of the CAD/CAM system was established, which had B/S structure. The five function modules were introduced. So designers and producers could do different work in different places to make the best of resources. Thirdly, using the system, the overall design and key parts design could be finished, and the initial model could be submitted quickly. Furthermore, rapid prototyping (RP) was used to verify complicated design. In a word, to design the economical engraving machine for wood, use similar template to draw the new 3D model, and use RP technology to check the assembly and detailed design, this would reduced the design cost, ensure the drawing quality, and shorten the design cycle.
Comments on Composition of Solid Waste in University Kebangsaan Malaysia (UKM)
Authors: Ashtary Talkhestani Gelareh
Published: February 2012

This study determine and analyze the composition of solid waste in University Kebangsaan Malaysia (UKM). A total of 9 samples – over 2300kg of solid waste were sorted 3 times - on every Monday, Wednesday and Saturday for three weeks. These solid waste collected from faculties, dormitories and offices then separated in to Plastic, paper, metals, rubber and leather, organics, glasses and others. The result shown that organic matter is usually the predominant component in the solid waste stream, was about (41.76%), followed by paper (newspaper, magazines, cardboard and cardboard boxes) range around (17.55%); then plastic bag 14.33%. Glass, rubber and leather, plastic bottles and aluminum cans were the smallest composition in UKM, but these can be considered as reusable or recycled items. Also statistical analysis indicates that the waste characteristics for a given day are slightly different, depending on the social activity that is going on for day. Since the major solid waste stream in UKM is organic waste trying to do composting is suitable method .
Impact Analysis on Slip Strength Based on Fuzzy Analysis Hierarchy Process
Authors: Li Dong
Published: February 2012

In order to analyze the impact factors of slip strength in clamp devices for tunnel rigs in coal mine comprehensively and quantitatively, a multi-factor and hierarchy index system with 13 indexes were established, including 4 fields of driller, construction characters, technology and environment. Fuzzy Analysis Hierarchy Process (FAHP) was used to analyze slip strength. A simple method to construct fuzzy consensus matrix was introduced to obtain the weight of different factors. Result shows that FAHP is validated to be used in slip strength impact analysis.
Comparison of Rough Graph and its S-Rough Graph
Authors: He Tong
Published: February 2012

By using rough similarity degree, this paper compares rough graph and its S-rough graph. Some basic conclusions are presented. Furthermore, the particular properties of rough similarity degree between rough graph and its S-rough graph which is got under effect of single edge transfer are discussed.
Simulation Study on Tapered and Spherical Shaped Charge under Underwater Explosion
Authors: Zhou Fang Yi , Jiang Tao , Wang Wei Li , Zhan Fa Min , Zhang Ke Yu
Published: February 2012

For improving the damage effect to underwater target of warhead, a kind of metamorphic tapered angle shaped charge is designed, and the damge mechanism is analyzed. The physics modle of tapered and spherical shaped charge under underwater explosion is built, numerical simulation is done by LS-DYNA, the stress distribution and velocity of jet are got. The result shows that the shaped charge jet formed by this kind of structure can provide moving space for latter EFP, which improving the damage effect to target.
The Fault Recognition of Motor Based on the Fusion of Neural Network and D-S Evidence Theory
Authors: Du Hai Lian , Wang Zhan Feng , Lv Feng , Xin Tao
Published: February 2012

In order to reflect the motor from various aspects and realize the motor system state failure mode automatic identification and accurate diagnosis, neural network combined with the D-S evidence theory to form the motor fault diagnosis system. In data fusion level, fault characteristic is classified; and then the fault feature is extracted by the BP neural network and the local fault of the motor is diagnosed, as a result, the independent evidence is obtained; at last the D-S evidence theory fusion algorithm is used on the evidence to achieve the fault of the motor accurate diagnosis.Broken test proved that the diagnosis system improves the motor of the fault diagnosis of accuracy, and can meet the needs of real-time diagnosis. The diagnostic test proved that the diagnosis system improves the accuracy of motor fault diagnosis, and can satisfy the diagnosis in real-time.
Finding Values for Multi-Valued Features
Authors: Choi Woon Ho , Jeong Hwa Young
Published: February 2012

In this research, multi-valued vowel systems are investigated to find optimal values for features like the advancement, height, and roundedness of vowels. For this purpose, two constraints are supposed to be satisfied: Values for the roundedness feature can discriminate, and the distance between an unrounded vowel and a corresponding rounded vowel may be small enough to show.
Generators Effect on Voltage Stability Enhancement by Normal Forms of Diffeomorphism
Authors: Yu Pei Jia , Jiang Ting Ting , Zhang Jing
Published: February 2012

Generators are of different importance to the system in terns of voltage stability. It is extremely vital to research generators’ impacts on the voltage stability. In this paper, the theory of the normal forms of diffeomorphism is used to analyze the power flow equations. By this method, the nonlinearity of power systems can be taken into consideration. Therefore, the impact of generators can be measured with more accuracy even for the cases in which the system is characterized with strong nonlinearity. The IEEE 14-bus test system is used as a case study. The results show that it ranks the generators with more accuracy than the traditional linear method.
Dynamic Balancing Modal Analysis and Vibration Suppressing Design for Reciprocating Compressor Crankshaft
Authors: Huang Yi Cheng , Lee Fong You
Published: February 2012

The purpose of this study is to improve the problem of vibration which occurs in a running reciprocating compressor, by determining an optimal crankshaft counterweight and narrowing the movement trajectory of the crankshaft connecting rod mechanism. An analytical solution method is applied to satisfy the requirements for vibration reduction. Use of finite element software is to simulate the modality and deformation of crankshaft under various conditions of counterweight. Modal testing shows a difference of less than 6 % between the simulation and the experimental results. After the crankshaft counterweight is machined and installed, the new crankshaft is able to reduce compressor vibrations from 32 mm/s down to 15.8 mm/s and noise reduction of 3 dB. This study can provide information pertaining to the design process and assessment to any future new compressor designs.
Design and Application of the Intelligent Keyboard Based on ADC Interface
Authors: Yang Ju Qing , Liu Jiao Yue
Published: February 2012

This paper proposes the conception of stepper motor controller’s design on the basis of the principle and algorithm of fuzzy BP network. It realizes the control function by identifying the consequent parameters. After taking some simulation experiments, the system control performance is good, the system operation is stable, and no runaway phenomenon has happened.
Numerical Simulation Analysis of Underground Integrated Support under High Stress
Authors: Li Zhan Jin , Zhao Xue Li , Zhang Yang
Published: February 2012

Using numerical simulation technology, coupling support mechanism of anchor-mesh-cable+ bottom-anchor has been analyzed. According to actual engineering of the Fifth Coal Mine of Hemei, the reasonable coupling support structure of anchor-mesh-cable+ bottom-anchor + truss under high stress has been analyzed. It is proposed roadway damage is twist deformation under high stress. By using the reasonable coupling support structure and parameter of anchor-mesh-cable+ bottom-anchor the high stress in underground rock laneway can be controlled and supporting effect is perfect.
The Study of Coalmine Safety Prediction Based on System Dynamics
Authors: Liu Wen Sheng , Zhu Ming
Published: February 2012

This paper pointed out the importance of safety prediction, introduced system dynamics into coal mine safety prediction, analyzed main controllable safety factors in coalmine and causality diagram, established the system dynamics flow chart model and used the method of simulation data to demonstrate the theoretical effectiveness which provided a reference for safety managers to make decision.
Modeling and Co-Simulation for Air Brake System of Heavy Truck
Authors: He Li , Wu Jing Lai , Peng Man Long , Hou Yu Ming , Chen Li Ping
Published: February 2012

Air brake systems have been widely used in heavy trucks and intercity buses for its great superiority over other brake system. In traditional, many researchers focused on the vehicle dynamics which employ the static characteristic of brake system to analysis the vehicle brake capacity. In fact, the practical performance of air brake system may be greatly different from the static theory. Thus, it is necessary to build an integrate air brake system model to simulate the process of brake accurately. Also, some works focused on the dynamic characteristics of brake system have been completed, but it is not comprehensive without the considering the effect of vehicle dynamics. In this paper, a completely air brake system dynamic model is built, where the air brake system contains pneumatic subsystem and mechanical subsystem. The air brake system is embedded in a heavy truck dynamic model which contains three axles. The simulation results show the brake distance, vehicle velocity, vehicle deceleration, and brake torque for each wheel in the process of brake.
Study and Design of a 3-Lamp Cold Light Lifting Retractor
Authors: Xiang Bo , Wang Chun Sheng , Zhao Xiao Fang , Ge Wei Qing
Published: February 2012

This paper introduces the composition and usage of the18 luminescence tubes shadowless retractor, the Single-port gasless laparoscopy minimally invasive surgical instrument， which is the national patent products. As for the issue of inadequate illuminating intensity, the 3- lamp cold light Lifting retractor system is presented for the first time in domestic, as well as its designing and manufacturing procedure. It also presents the trial-producing of 3- lamp cold light Lifting retractor and its supporting power box. The system has been tested. It can apply to the disaster relief field and other special conditions, at the same time, it can improve the intensity of illumination with its simple producing procedure.
The Design and Simulation of Low-Cost and Super-Applicability Flight Control System of Super-Size UAV
Authors: Rong Liu , Lu Yu Ping
Published: February 2012

In this paper, considering the stability and robustness of the aircraft, the flight control system is designed following the aspect of high flexibility and low cost. Comparing with the flight control system of super-size high-subsonic Unmanned Aerial Vehicle (UAV) in the world, the system presented in this paper has adopted the inimitable control technique of flying-off course、low-cost combinatorial navigation strategy and the advanced safety scheme, which can guarantee the performance, degrade the cost and extend the airspace and groundspace of the aircraft.Through quite a few simulations, the results show that this system can guarantee the attitude and altitude stable. The error between the flight path and programming path is very small. Flight curve is prefect; and the system performances can be achieved completely.
Speed-Regulation System of PMLSM Based on BP Neural Network PID Control
Authors: Wang Fu Zhong , Yu Qiong Xia
Published: February 2012

For the characteristics of permanent magnet linear synchronous motor (PMLSM) hoisting system’s nonlinear, time-varying and vulnerable to disturbance, based on the established PMLSM d-q axis dynamic model, designed of an improved BP neural network PID speed controller. Modified the fixed learning rate in BP neural network to adaptive adjustable, and added the momentum to reduce the oscillation tendency in the learning process, greatly improved the convergence speed and avoided the network into a local minimum. Compared with the simulations of traditional PID and the improved BP network PID speed controller, the results showed that the improved BP neural network PID speed controller had the high quality and it can make the system with better dynamic performance and robustness.
The Controller Design for DC Motor Speed System Based on Improved Fuzzy PID
Authors: Ma Bin , Meng Qing Bin , Yu Feng , Han Zhong Hua , Wang Chang Tao
Published: February 2012

In this paper, a controller is designed based on improved fuzzy PID to solve the problem that the dc motor performance of speed and dynamic is poor when using the conventional PID controller for the lack of adaptive capacity of the controller parameters. The improved fuzzy control algorithm is used for the tuning of PID controller to get good speed performances, which automatically adjust the parameter of PID controller according to the motor speed. The simulation results show that the improved fuzzy PID control with the advantages of fast response, small overshoot and strong anti-interference capability can effectively improve the dynamic characteristics and steady state accuracy.
Dynamic Analysis of a Truck Frame with Fuzzy Uncertain Parameters
Authors: Luo Zhi Kun , He Ping , Tan Wei , Jin Guo Dong
Published: February 2012

Frame acts as the structural backbone of a truck, which supports the components and payload placed upon it. When the truck travels along the road, the frame is subjected to vibration induced by road roughness and excitation by vibrating components such as power-train, transmission shaft and more that mounted on it. Though many researchers have made great progress in the static and dynamic analysis of truck frame, most research was based on the assumption that all the design parameters of truck frame were deterministic. However, design variables for truck frame are always uncertain in the actual realistic engineering cases due to tolerances in manufacturing and assembly processes. In this paper, fuzzy algorithm is introduced to analysis the response of the frame with uncertain parameters. By using fuzzy set theory, uncertain input parameters such as the elastic modulus, Poisson ratio are described mathematically as fuzzy variables or fuzzy random variables and integrated into mode analysis. The simulations are carried out to analysis the system performance under fuzzy uncertain parameters. Results are presented showing the effectiveness of the method for modeling systems with uncertain parameters.
A Novel Impulsive Control Synchronization of a Lorenz Chaotic Scheme with Special Parameters
Authors: Chen Yan Hui
Published: February 2012

One of the common problems of chaos-based secure communication is all these methods need control signal be transmitted in public channel between connectors. Attacker can reconstruct the chaotic system or estimate parameters by using the information of the chaotic system which can be obtained by analyzing the control signal. Therefore we propose a hybrid chaotic synchronization control scheme which contains both continuous chaotic system with Special oscillating parameters and discrete chaotic system. The two systems can get synchronized without control signal transmitting which has reduced the risk of the security.
Modeling and Simulation of Permanent Magnet Synchronous Motor for Pure Electric Vehicle Based on Space Vector Pulse Width Modulation
Authors: Song Shu , Zhang Ya Jun , Lin Wei
Published: February 2012

Space Vector Pulse Width Modulation (SVPWM) technique is one of the best method of PWM variable frequency drive and make the AC motor achieving the performance as good as DC motor. Permanent Magnet Synchronous Motor (PMSM) has many advantages of small volume, steady operation, high energy efficiency, large output torque, etc. To solve the problems of auto environment and energy sources, study on Pure Electric Vehicles (PEV) driven by PMSM based on SVPWM is an important research direction and has the practical value. On the basis of analyzing the basic models of SVPWM, PMSM and PEV, simulation model of PMSM Control System for PEV can be constructed. The results of the simulation show that the control system has super performance and meet the request of system.
The Control Simulation Analysis of MATLAB-Based High-Precision Numerical Control Welding Positioner
Authors: Wang Bin Wu , Sun Yan Hua , Zhang Wen
Published: February 2012

Based on electromechanical system dynamics model of 3-axis NC positioned, together with the general nonlinear decoupling control theory, the decoupling control method of NC 3-axis positioned is proposed in this paper. In order to control each axis and the simulation of the decoupling control, the Simulink platform of MATLAB soft is used to build a electromechanical system simulation model for NC positioned. The results show that the proposed nonlinear decoupling feedback control method is effective and applicable.
Output Feedback Controller Design Based on Fuzzy Singularly Perturbed Model
Authors: Li Li , Sun Fu Chun
Published: February 2012

We will propose a kind of new controller for the nonlinear singularly perturbed system with immeasurable states on the basis of the Fuzzy Singularly Perturbed Model (FSPM). An observer is designed to approximate the immeasurable tracking errors. Two-step approach and Schur theory are used to solve Bilinear Matrix Inequation(BMI) to achieve the gains of the controller and the observer. It can make the states of the plant to follow those of the stable reference model. Lyapunov constitute techniques can be used to prove the stability of the closed-loop systems. Finally the simulation is offered to illustrate the effectiveness of the proposed approach.
Modeling and Simulation of a Three-Phase Catalytic Slurry Intensified Continuous Chemical Reactor
Authors: Li Shi , Hu Yan , Zong Xi Ju
Published: February 2012

This work proposes a dynamic model of a three-phase catalytic slurry intensified continuous reactor. The model is simulated to describe the dynamic behaviors of the hydrogenation of o-cresol on Ni/SiO2 catalyst. The nominal operating point and the transient responses for different input perturbations are discussed.
New Method of Diagnosis and New Knowledge Acquirement for Fault Diagnosis Expert System of High Voltage Circuit Breaker
Authors: Yang Yong Mei , Sun Nai Quan , Xu Hong Ke
Published: February 2012

In this paper, an improved algorithm of general radial basis (RBF) function neural network is introduced, based on improved algorithm, the neural network realized quickly fault diagnosis and self-update of neural network structure, and the neural network is applied to the on-line fault diagnosis expert system. The expert system deals with the fault data that send from on-line monitoring equipment by using neural network, and it can discover the fault type and give reasonable solution by forward reasoning. Meanwhile, the expert system has the ability of achieving new knowledge based on the application of self-update ability of RBF neural network.
Influencing Factors Research on Compaction Effect of Coarse Rubber Granule Asphalt Mixture
Authors: Zhang Zhuo
Published: February 2012

Dry process was taken by coarse rubber granule replacing coarse aggregate of the same volume. By an orthogonal experiment, a combined method of vibration compaction and Marshall compaction was used to study main influencing factors on compaction effect of coarse rubber granule asphalt mixture, making voidage as guidepost. The experiment results show that the most prominent influencing factor is rubber content, secondly the influencing factors are compaction temperature, vibration frequency and vibration time, the least is compaction times. An optimal compaction process for the coarse rubber granule asphalt mixture is put forward.
Molecular Dynamics Simulations of Polypropylene and Talcum Nanocomposite
Authors: Song Na , Wang Qing , Zhang Xiao Ji , Ding Peng
Published: February 2012

Molecular modeling techniques were applied to predicting binding energy for PP/talc and PP-MAH/talc. A supercell containing talc and two polymer chains of 25 repeating units length was constructed. The COMPASS forcefield has been used to represent the interactions in the nanocomposite system. The interactions are improved between the polymer and the clay in the presence of functional groups. And the total energy and potential energy between PP and the talc decreases almost linearly with the simulation time.
The Application of ABAQUS in Finite Element Analysis of CFRD
Authors: Huo Xiang Li , Wang Bo , Li Zong Kun
Published: February 2012

The deformations and stresses of a concrete face rockfill dam (CFRD) for dam construction and reservoir impoundment were simulated by the element add/remove technique of ABAQUS. And, the sensitivity analysis of main parameters of the Duncan-Chang E-B model was carried out by the method of univariate sensitivity analysis and the critical sensitivity parameters of the deformation and stress on the CFRD were obtained. This research has some guidance and reference for future similar projects design and monitoring.
Reliability and Sensitivity Analysis of Infinite Plate Containing Hole
Authors: Li Xiao Ying , Zhang Deng Feng , Wang Xin Chun
Published: February 2012

Based on the finite element theory, the infinite plate containing hole is analyzed in the stretching circumstances. The maximum stress was regarded as a random output variable, when the plate length, the plate width, the plate thickness, the elastic modulus, uniform distribution of load and the diameter of the hole were randomized, and were considered as a random input variable. Supposed all input variables are normal distribution. After one hundred times Monto Carlo sampling is implemented, the reliability and sensitivity of infinite plate containing hole can be obtained.
Stray Light Analysis of Solar Photoelectric Detection System on Space Target
Authors: Li Ling Yin , Wang Yi Fan , San Xiao Gang
Published: February 2012

Most conventional spacious solar photoelectric detection systems suffer from unexpected stray light. This paper demonstrates the effects on photoelectric detection system bring out by stray light. On this foundation, build up evaluation index of stray light system, to search the reasonable programme to eliminating stray light. A detailed telescope system geometry model was created, and scatter models were create for telescope and enclosure components. By the means of designing the structure of main baffle, baffle vane and the coating technology. In order to verify the prosperity of structure that designed, we utilizes software to analysis opto-mechanical model. we utilizes software to analysis opto-mechanical model. The simulations show that point source transmittance of the system is thus reduced by up to two orders of magnitude between 10-8 and 10-10. Meanwhile, the experiment obtains clean detection data which satisfies the system requirements. Stray light has been suppressed effectually, and so measurement precision was improved from detection graphics.
Structural Optimization Research of Composite Aircraft Based on Different Wing Stiffness Constraints
Authors: Liang Li , Qin Sun
Published: February 2012

Wing stiffness, mainly including bending stiffness and torsion stiffness, is very important in aircraft structure design. In order to research the relation between wing stiffness and optimization results, this paper makes optimization analysis to a composite T-tail configuration and a composite flying wing configuration based on different wing stiffness constraints, and some valuable conclusions are achieved.
Effect of Polyvinylpyrrolidone Ratio on Synthesis of High Concentration Nano-Silver Colloid
Authors: Li Wei Wei , Li Lu Hai , Mo Li Xin , Fu Ji Lan
Published: February 2012

Conductive ink, especially the nano-silver ink is becoming more and more popular in printable electronic field. In order to synthesize high concentration, stable nano-silver colloid, liquid chemical reduction is used and different ratios of PVP to silver nitrate are studied. After precise adjustments of the parameters, colloid with silver content of wt7.8% is obtained. Particle size distribution, UV-Vis spectra, thermo gravimetric analysis and SEM images are conducted to characterize the silver particles. The results show that when molar ratio of PVP to silver nitrate is 0.6, the average particle size is 170nm and some deposit can be seen, while the ratio increases to 1.5, the size decreases to 68nm, and the residue quality of the silver colloid showed in the TG analysis is 7.88%. After aging for 1 month, the colloid is still stable and the color keeps to the original dark green. When the ratio continues increasing to 2.5, particle size becomes 112nm and some larger particles beyond 3μm can be observed.
Accuracy Comparison of Elastic Impedance Formula
Authors: Zhang Jin , Liu Huai Shan , Tong Si You , Wang Lin Fei , Xu Bing
Published: February 2012

Elastic impedance (EI) inversion is one of the prestack seismic inversion methods, which can obtain P-wave and S-wave velocity, density, Poisson ratio, Lame coefficients and other elastic parameters. But there have been many EI formulas nowadays, so which formula should be used in inversion is an urgent problem. This paper divides these formulas into two categories, and use several forward modeling to test the accuracy of these EI formulas. It shows that using the first kind of EI formulas in near offset seismic data can get high precision results.
Improved Genetic Algorithm for Injection Production Parameters Optimized Design of Steam Soak Well
Authors: Sun Tian Jian , Shi Jun Feng , Xu Lei
Published: February 2012

He development effect of steam soak well is influenced by the combination of the following parameters: injection speed, dryness fraction of steam, cyclic steam injection volume, soaking time and bottom hole flowing pressure. Take the advantage of annealed genetic algorithm which characterize with the traits of fast search and globally optimization. Based on the mathematical model of the output of the steam soak well, and optimize injection production parameter of the steam soak well which is aimed at the cycle average daily profit maximum, and make the field application.
The Application and Simulation Research of the Fuzzy PID Control Used in PVC Polymerization Temperature Control System
Authors: Liu Jing
Published: February 2012

The process of PVC polymerization is nonlinear and time-delayed. It is very difficult to establish an exact mathematical model. Based on the analysis of the conventional PID controller’s limitation, the fuzzy PID control system of PVC polymerization is introduced. A new kind of fuzzy PID controller is designed and the three parameters of PID can be self-tuned on-line. The simulation result proves that fuzzy PID controller is better than common PID controller.
Synthesis and Characterization of Liquid Crystalline Polysiloxanes Containing Terminal Fluoromethyl Groups
Authors: Meng Fan Bao , Diao Na , Zhu Cui Zhi , Li Ri , Gao Hong Mei
Published: February 2012

A series of liquid crystalline (LC) polysiloxanes (PI-PV) were prepared by use of poly(methylhydrogeno)siloxane and two kinds of terminal olefinic monomers. The chemical structures and liquid-crystalline properties of the synthesized materials were characterized by various experimental techniques. From PI to PV, the glass transition temperature and the isotropic temperature decreased slightly with increase of terminal fluoromethyl units in the polymer systems. All the monomers and polymers showed nematic phase with wide mesophase temperature ranges. The polymers PI, PII and PIII displayed single nematic mesophase, but PIV and PV bearing more terminal fluoromethyl units showed another smectic mesophase besides nematic mesophase.
Numerical Simulation of Uniform Diffusion of Bolt Mesh Support to Wall Rock Stress
Authors: Zhang Jia Yong , Gong Xue Min , Guo Li Wen
Published: February 2012

Soft rock roadway is one challenge of roadway support. With plastic state, it has a certain bearing strength, and its large plastic performance must release out in some form. Therefore soft rock roadway is not a single support effective, it must use a joint way. By numerical simulation, this paper analyzes uniform diffusion of bolt mesh support to wall rock stress, which provides a theoretical basis for bolt mesh support of soft rock.
Design of Optimal Control for a Stratospheric Airship Based on Generalized Coordinate Frame
Authors: Zhu Ming , Wu Yong Mei , Zheng Ze Wei
Published: February 2012

An optimal control is presented in this paper. First, nonlinear dynamic model of a six degree of freedom stratospheric airship, traditional and full-actuated, is built based on generalized coordinate frame. Second, optimal control law is determined by Hamilton function and performance index function. This optimal control can be regarded as extension of feedback linearization control law.