bluuebunny/crossref_metadata_2025 huggingface dataset:
Research on Permanent Magnet Linear Motor without Friction Feed
Authors: Lan Yi Peng , Zhao Hui , Lan Hong Xuan
Published: November 2011

In order to eliminate the friction of the feed system in NC Machine Tools, this paper presented a novel direct magnetic levitation permanent magnet linear motor. First, the structure and magnetic levitation theory of the direct magnetic levitation motor were discussed. Second, on the basis of the motor magnetic hierarchical model, the expression of the magnetic field and the electromagnetic force was derived by the virtual displacement method. Finally, no-load magnetic field, load air-gap flux density and the electromagnetic force of the motor were simulated by using Ansoft Maxwell 2D software. The results of simulation test indicated that using direct magnetic levitation permanent magnet linear synchronous motor can realize the friction-free feed of NC Machine Tools.
The Drying Process in Spray Drying and Creation Simulation Model
Authors: Orlovský Imrich , Hatala Michal , Mičko Milan
Published: November 2011

The article describes the activities of spray dry, for which was designed a mathematical model of the drying. This model allows to identify and define the process throughout drying. The output of this model is the equation of balance. Production process of ceramic granulate was selected as subject for simulations. Simulation model is created in Matlab program – Simulink according to the equation for energy balance and parameter values from real kiln. Simulation monitors the dependency of mensural granulate moisture on absolute moisture of drying gas on the output.
Design and Implementation of a Multi-Channel HDLC Protocol Controller Based on FPGA
Authors: Gu Yong Hong , Huang Wei , Yang Qiao Li
Published: November 2011

To transmit and receive data over any network successfully, a protocol is required to manage the flow. High-level Data Link Control (HDLC) protocol is defined in Layer 2 of OSI model and is one of the most commonly used Layer 2 protocol. HDLC supports both full-duplex and half-duplex data transfer. In addition, it offers error control and flow control. Currently on the market there are many dedicated HDLC chips, but these chips are neither of control complexity nor of limited number of channels. This paper presents a new method for implementing a multi-channel HDLC protocol controller using Altera FPGA and VHDL as the target technology. Implementing a multi-channel HDLC protocol controller in FPGA offers the flexibility, upgradability and customization benefits of programmable logic and also reduces the total cost of every project which involves HDLC protocol controllers.
A Low Native Jitter Voltage Controlled Oscillator on 0.18μm CMOS Process
Authors: Ma Zhuo , Luo Li , Guo Yang , Xie Lun Guo , Chen Ji Hua
Published: November 2011

In this thesis, a kind of jitter is focused on, which is called Native Jitter (NJ) of the Voltage Controlled Oscillator (VCO). The cause of NJ is the high order effect of the transistor itself in the VCO, and almost has no correlation with the control voltage or supply. The detailed analysis of the cause and the evaluation of this NJ is proposed in this paper, and an Inter-locked Dual-loop VCO (ID-VCO) is put forward, in which most of the NJ is eliminated. A test chip of the ID-VCO based on 0.18μm CMOS process is established. Compared with the classical single end VCO, the result shows that the peak to peak value and mean-root-square values of period jitter reduce 15.4% and 16.3%, the same values of cycle-to-cycle jitter reduce 9.82% and 6.98%, respectively.
Application Research of CMAC-PID Control in Photovoltaic Tracking System
Authors: Xiao Jun Ming , Jiao Ling Yun , Zhu Hai Ming , Xiao Fan Kai
Published: November 2011

In order to improve the generated energy of PV array and adding the utilization ration of solar energy, the photovoltaic tracking system adapts electro-optical tracking techniques which making the solar panels always perpendicular to sunlight. This paper mainly introduces the basic structure of photovoltaic automatic tracking system and the control strategy of the stepper motor. The theories of cerebellum model articulation controller and conventional PID control are also described. And combined with the characteristics of PID control, the compound control based on the cerebellum model articulation controller and conventional PID was applied to photovoltaic automatic tracking system and compared with fuzzy PID control algorithm. The simulation result shows that the cerebellum model articulation controller and conventional PID parallel control algorithm has the advantage of small overshoot, high robustness, fast response, high control accuracy, and so on.
The Design of Single Phase AC Regulated Power Supply with PWM Chopping Control Compensation
Authors: Ma Yu Quan , Zhang Li Hong , Han Shu Fen , Song Dong Dong
Published: November 2011

In view of the large volume and complex control circuit of current AC regulated power supply, a unipolar AC regulated power supply with chopping control compensation is designed, and the calculation method of output filter parameter of chopping circuit is given. In the system, MCU of STC12C5A62AD with 8-bit A/D input and PWM output is adopted, by which not only simple structure and control but also fast dynamic response are get; DC voltage sampling technique is adopted, so sampling frequency is up to 12.8kHz, sampling precision is high too; PWM chopping frequency is 4kHz, so capacity of filter capacitor and inductors are small, and harmonic is little. Experiment results of prototype show that the system has high precision of output voltage and greater practical value.
Effects of Spontaneous and Piezoelectric Polarization on Spontaneous Emission Rate of Blue LEDs on SiC Substrates
Authors: Wang Yu Fu
Published: November 2011

High power InGaN-based blue LEDs have been commercialized despite the presence of a high dislocation density in the heteroepitaxial structures. Traditional trial-and-error techniques are very inefficient for improving the process of MOVCD. We analyze the effects of spontaneous and piezoelectric polarization on spontaneous emission rate of blue LEDs on SiC substrate by adjusting screening values and barrier doped concentration. The simulation results indicate to improve characteristics of blue LEDs on SiC substrate, interfacial charges for piezoelectric and polarization should get equilibrium with crystal defects and barrier doped concentration. There is an optimization point.
High K / Metal Gate of Short-Channel SOI NMOSFET Research
Authors: Lu Gang , Zhao Bo
Published: November 2011

Short-channel under TaCN/La2O3 gate structure SOI NMOSFET has been studied in this paper, contrast with the traditional gate structure gate leakage current and others electrical properties, using TaCN/La2O3 gate structure，significantly improved short-channel device performance etc. Additionally, the gate structure in the L=40nm, 30nm and 20nm of C-V characteristic and output characteristic are also studied; all the simulation results coincide with the theoretical analysis.
Research on Novel Structure of Diode Clamed Multilevel StatCom
Authors: Zhang Jun Li , Li Jian Zhuo , Wang Ya Yun
Published: November 2011

The inverter technology gaining interest in high voltage high power is likely the multilevel inverter. The main characteristic of a multilevel inverter is able to reduce each power device voltage stress. Static Synchronous Compensator (StatCom) is the major application of the inverter to compensate reactive power in power system. Compared with traditional StatComs, multilevel StatComs exhibit faster dynamic response, smaller volume, lower cost, and higher ratings. A novel structure of StatCom with delta-connected multilevel inverter is proposed. The SPWM technique, which offers simplicity and good response, is used in the multilevel StatCom switching control strategy.
Reliability Test and Evaluation Analysis of Silicon Pressure Sensor under Vibration Stress
Authors: Qin Li , Shi An Li
Published: November 2011

The model silicon pressure sensor was taken as the object; in this paper, we built failure physics equation of sensor under the vibration stress based on the failure modes and failure mechanism of pressure sensor, and using vibration stress as the acceleration factor to process accelerated life testing under invariableness stress. The results show that failure physics equation of sensor yields the inverse power law relationship. The estimated value of reliability character and accelerated life equation of sensor under the vibration stress was attained through analyzing testing data and the average life and reliable life of sensor has been attained through reliability evaluation.
The Meso-Piezo-Capacitive Effect
Authors: Nan Xiao Wu , Wen Ting Dun
Published: November 2011

In mesoscopic scales, we design a single potential heterojunctionalong the direction of growth (001)，Firstly,we analyzes the conditions of the structure as a capacitor, and then through the schrodinger equation and poisson equation introduced the relation between capacitance and the width of the barrier,at last we investigate,theoretically the effect of the capacitance changes by the elastic stain due to a certain stess on the structure which along the direction of growth. We call it meso-piezo-capicitive effect.
An Improvement to Single-Phase RCD Based on MSP430
Authors: Huai Wen Jun , Fu Zhou Xing , Wu Xiao Fan
Published: November 2011

A new type residual current protector is designed in this paper. Using residual magnetic flux and the resonance voltage as leakage current signal in iron core, when there are residual current in power suply system, the device can automatically take relevant actions according to the real-time residual current value that is detected by detection circuit. The protector can be used to against electric shock and protect a ground fault. When the protection is occurred, the residual current protective device (RCD) possesses the inverse time lag function, ideal time delay and the automatic reclosing function. It also transmits the fault information to control center by the inter-integrated circuit (I2C) bus. Resonant circuit can avoid live parts injury, which limit the current value through contact resistance, and does not interrupt the work of electrical equipment. So the RCD can be used in all kinds of low voltage single-phase system that will snsure the safety and the reliability of the power supply.
The Study of Aeroengine Automatic Starting Logical Module Oriented towards Maintenance Training
Authors: Geng Hong , Wang Min
Published: November 2011

According to the complex relationships of the informatin links and varieties of failure modes during aeroengine automatic starting ,in order to achieve functions of airline maintenance,the application of directed graph establishes the module. First,study the logic of aeroengine automatic starting process,find the items that lead the main functions and the relationships of information transmission between items.Then,analyze the input-output and failure modes of items, list the functional logical expression of items,establishe the directed graph module.
Based on CM6900 Resonance IC Controller SRC LED Lamp Driver Circuit
Authors: Wei Shu Hua , Hou Ming Jin
Published: November 2011

CM6900 is a kind of built-in synchronous rectifier drivers, OVP / OCP, and better soft-start mode, while a FM + PWM operation mode of the resonant controller IC, and its application in the constant current / constant voltage mode is very easy. Based CM6900's 90W SRC LED lamp drive circuit relative to the LLC drive circuit is easier to implement synchronous rectification, Efficiency (greater than or equal to 0.94), transformer design is simple (standard BOBBIN reduce mold costs).
Influence of Body Contact on the ESD Protection Performance in 0.35μm Partially-Depleted SOI Salicided CMOS Technology
Authors: Wang Zhong Fang , Xie Cheng Min , Yue Hong Ju , Wu Long Sheng , Liu You Bao
Published: November 2011

Although body contact can solve the problem of floating body effect in the partially-depleted (PD) SOI technology, it still has important influence on the ESD protection performance. In order to investigate the influence of body contact on the ESD protection performance, three different structures are fabricated in 0.35μm PD SOI salicided CMOS technology, they are stick gate structure with body floating, H gate structure with body contact located outside the edge gate, and body tied source (BTS)structure with body contact placed intermittently along the source diffusion. The transmission line pulse generator(TLPG) measured results of these three different structures are compared and analyzed, both the stick gate structure with body floating and BTS structure have a better robustness level than H gate structure with body contact.
Equivalent Circuit Model of Top-Emitting OLED for the Designing of OLED-on-Silicon Microdisplay
Authors: Zong Shao Xin , Li Chuan Nan , Lv Chen Huai , Xie Guo Hua , Zhao Yi , Liu Shi Yong
Published: November 2011

In the commonly-used EDA software, there is no equivalent circuit model of top-emitting OLED for SPICE, so it is difficult while the OLED pixel driving circuits are designed such as in microdisplay applications. To solve the problem, its SPICE model of top-emitting OLED was studied in this paper. Three models including the diode-connected NMOS model, the single-diode model, and the double-diode paralleled model are discussed and their simulation results from EDA software HSPICE are compared. Results show that the fitted errors obtained from the diode-connected NMOS model is the smallest, but its simulated errors are the largest. The fitted errors and the simulated errors obtained from the single-diode model are also large. However, small fitted errors and simulated errors got from double-diode paralleled model show that this model satisfies the application of the designing for OLED pixel driving circuits.
Correlation Analysis of Polycrystalline Silicon Industry and Photovoltaic Industry in China
Authors: Hu Liu Yun , Guo Xiong Fei
Published: November 2011

The photovoltaic (PV) industry, as the renewable energy, has discarding the traditional energy consumption and dependence mode completely, which had attracted more and more attentions of the countries all over the world. This paper analyzes the polycrystalline silicon, as the most important step of the PV industrial chain, the effects of its development on China photovoltaic industry, and forecasts the output of domestic polycrystalline silicon industry by using the grey model. According to the forecast results, proposing the relevant suggestions for the further development of PV industry in China.
Active Disturbance Rejection Control with Self-Optimizing Control of Permanent Magnet Synchronous Motor
Authors: Wang Song , Liu Ming Guang , Wang Zhao Yong , Wu Xiao Na , Cui Xiao Guang
Published: November 2011

This paper studies the ADRC(Active Disturbance Rejection Control) technique further used in Permanent Magnet Synchronous Motor. Combining the ADRC with the self-optimizing technique, we design a controller with Self-optimizing Control. The result of simulation shows that the ADRC technique with Self-optimizing Control has better control characteristics, compared with the classical PID and ADRC techniques.
Regulator Design of Vector Control System
Authors: Yang Ying , Yuan Jing , Zhang Hu
Published: November 2011

A Decoupling method based on feedforward voltage compensation is adopted to eliminate completely the coupling between exciting current and torque current. Based on conventional design methods of single-variable linear system , the paper analyses and designs detailedly the flux loop, speed loop and current loop. A design method based on double closed-loop PI regulator for speed sensorless vector control system is proposed. Through experimental results, we demonstrate its good performance.
Variable-Gain Cross Coupling Control for Linear Motor X-Y Table Based on Genetic Algorithm
Authors: Wang Li Mei , Pang Yue
Published: November 2011

To achieve high precision contour tracking control for Permanent Magnet Linear Synchronous motor drive X-Y table, genetic algorithm was used on PID controller parameters optimized. By the ability of gene mutation, the parameters were avoided falling into local optimum point. Consequently, the global optimal value can be found directly. Variable-gain cross coupling controller was used to compensate X-Y axis coupling error. Eventually the path tracking contour error is greatly reduced to the expected accuracy limits. Theoretical analysis and simulation results show that the designed control system make X-Y table possess high contour accuracy
Optimization of Micro-Milling Process with Genetic Algorithm
Authors: Chiu Neng Hsin , Weigh Guo Ting
Published: November 2011

As miniaturization of product becomes a trend, meso-machining technique for relevant components becomes necessary. Micro- milling with small size cutter is one of the key techniques for meso-manufacturing. When size of tool becomes small, feasible range of process parameter becomes limited. Without properly selected parameter, it could result in cost increase and quality unacceptable. Optimization of micro-milling to maximize removal rate and tool life is an important issue. This study aims at developing an optimization module using genetic algorithm for micro-milling. A milling experiment for constructing a prediction model of tool life was conducted. A computer program based on Pareto genetic algorithm was coded to search for optimized solution. A set of non-dominated solution satisfying dual objectives was obtained as the result. The solution can be used for determining milling parameter based on process interest.
A Study on the Effect of V-Ring Position on the Die Roll Height in Fine Blanking for Special Automobile Seat Recliner Gear
Authors: Kim Jong Deok , Kim Heung Kyu , Heo Young Moo , Chang Sung Ho
Published: November 2011

In this paper, the relation between die roll height and V-ring position was studied by fine blanking experiments for imaginary special automobile seat recliner gear. The three die inserts and three guide plate inserts with different V-ring positions were machined, and fine blanking tool was manufactured. Using the fine blanking tool, three experiments were conducted on the 650 ton fine blanking press. Each die roll height was measured, analyzed and we found the tendency of die roll heights on imaginary special gear to increase with increasing the distance between V-ring position and contour of gear. This result can be used to minimize the die roll height of fine blanking gear parts when designing V-ring of fine blanking tool.
Acrylic-Based 1x2 Plastic Optical Fiber Coupler Device Manufacturing Using EGX400 Desktop Engraver System
Authors: Ehsan Abang Annuar , Rahman Mohd Kamil Abd
Published: November 2011

An all-acrylic-based 1x2 plastic optical fiber (POF) coupler has been designed and manufactured. The optical device is based on a simple 1x2 Y-branch coupler design with a middle high index contrast waveguide taper and splitting ratio of 50:50. Device modeling has been performed using non-sequential ray tracing with an insertion loss of 4.68 dB. Machining of the optical device has been performed using EGX400 desktop engraver system. 1 mm milling tool size with machine spindle speed of 15,000 rpm has been utilized. A simple optimization on the milling process prior to machining improved the coupling surfaces between the POF fibers and the waveguide taper. POF fibers are inserted into the engraved u-grooves and are passively aligned to the waveguide taper. The measured insertion loss is 7.5 dB and with a splitting ratio of 50:50.
A MEMS-Based Inertial Navigation System for Mobile Miniature Robots
Authors: Zhong Ming , Huang Bo
Published: November 2011

A real-time inertial navigation system (INS) for mobile miniature robots was proposed, which mainly consists of hardware platform and software system. Based on the principles of embedded system, and by use of MEMS-based inertial measurement units (IMU) and micro control units (MCU) including ARM and CPLD, a compact, low-power-consumption, low-cost, and universal real-time hardware platform was constructed for the navigation system. Besides, a μC/OS-II real-time operating system was transplanted for software developing, where all the algorithms of digital signal processing, data interpolation, navigation calculating were realized. Furthermore, a fuzzy system was designed for sensor data fusion so as to achieve accurate navigation. Finally, the MEMS-based INS was fully tested via experiments on a mobile miniature robot. Experiments results show that average error of the heading angle estimation is about 0.56%, average error of Attitude angle estimation is 2.57%, and the maximum error of plane position is about 10%, which indicates that this INS satisfies requirements of mobile miniature robots.
The Stabilization of Singular Linear Large-Scale Control Systems with Output Feedbacks
Authors: Chen Chao Tian , Ding Jin Lun
Published: November 2011

The stabilization problem of singular linear large-scale control systems with output feedbacks is investigated by using the generalized Lyapunov matrix equation, system decomposition method, singular systems theory and matrix theory. Some sufficient conditions for determining the asymptotical stability and unstability of the corresponding singular closed-loop large-scale systems are given. At last, an illustrate example is given to show the application of main result.
Application of Quantum-Behaved Particle Swarm Optimization in Engineering Constrained Optimization Problems
Authors: Tan De Kun
Published: November 2011

To overcome the shortage of standard Particle Swarm Optimization(SPSO) on premature convergence, Quantum-behaved Particle Swarm Optimization (QPSO) is presented to solve engineering constrained optimization problem. QPSO algorithm is a novel PSO algorithm model in terms of quantum mechanics. The model is based on Delta potential, and we think the particle has the behavior of quanta. Because the particle doesn’t have a certain trajectory, it has more randomicity than the particle which has fixed path in PSO, thus the QPSO more easily escapes from local optima, and has more capability to seek the global optimal solution. In the period of iterative optimization, outside point method is used to deal with those particles that violate the constraints. Furthermore, compared with other intelligent algorithms, the QPSO is verified by two instances of engineering constrained optimization, experimental results indicate that the algorithm performs better in terms of accuracy and robustness.
Influence of Surface and Interface Properties on the Electrical Conductivity of Silicon Nanomembranes
Authors: Zhao Xiang Fu , Han Ping , Scott Shelley , Lagally Max G.
Published: November 2011

Electrical conductivity of silicon nanomembranes (SiNMs) was measured by van der Pauw method under two surface modifications: hydrofluoric acid (HF) treatment and vacuum-hydrogenated(VH) treatment, which create hydrogen-terminated surface; and one interface modification: forming gas (5% H2 in N2) anneal, which causes hydrogen passivated interfaces. The results show that thinner SiNMs are more sensitive to the surface modifications, and HF treatment can cause larger drop of sheet resistance than that caused by VH treatment probably because of Fluorine (F). Forming gas anneal can also improve the conductivity depending on the interface trap density.
Research on Multiple Bi-Directional DC/DC Converter in Wind Power Flow Optimization and Control System
Authors: Xia Nai Yong , Zhao Yan Lei
Published: November 2011

A kind of multiple bi-directional DC/DC converter used in supercapacitor energy storage unit of the wind power flow optimization and control system is analyzed and studied. Based on DSPs, the converter uses a double closed-loop control strategy to stabilize voltage and uses a digital parallel current sharing strategy to eliminate circulation current among each converter unit. In the paper, firstly, the working principle and the working process of the multiple bi-directional converter are analyzed in detail. Then, on the basis of the small signal model, the way to voltage stabilization and current balance are presented. Finally, a low power converter prototype is designed and made to carry on the experiment. The experimental results show that the proposed control strategies are feasible and effective. So the multiple bi-directional DC/DC converter designed in the paper has comparatively high practicable value in the wind power flow optimization and control system.
Research on Co-Evolutionary Genetic Algorithm of Long-Distance Gas Pipelines Optimal Model Economy
Authors: Li Li Gang , Dai Yong Shou , Wang Ji Guang
Published: November 2011

Based on the analysis of the current long-distance pipeline network running conditions, an economic optimal mathematical model of the gas transmission network including compressor station is used. The natural gas pipeline network is divided into different parts, and adopting the cooperation co-evolutionary genetic algorithm, the subpopulations are created. The fitness function is established by taking advantage of the punish function. The results of the simulation show that this approach has better convergence. It is an effective method to solve the optimization problem.
Simulation of NN-Based MRAC for PMSM in AC Drive Mining Truck
Authors: Li Yong , Zhao Xiao Long , Ma Fei , Wang Yu Ting
Published: November 2011

Permanent magnet synchronous motor (PMSM) is a multi-variables, non-linear and strong coupling system. A model reference adaptive controller (MRAC) for PMSM based on back propagation (BP) neural network (NN) is proposed to solve the shortcoming of traditional proportion integration (PI) control method, which is widely used in linear system. According to the proposed method, the simulation model is established and simulated with Simulink. The adaptive control of motor speed is achieved with the training of BP neural network. Simulation results show that the system has long response time, small overshoot and high static performance.
Modeling and Simulation Research on the Maintenance System of Armored Equipment
Authors: Zhang Yong , Yang Hong Wei , Wang Sheng Feng
Published: November 2011

The evaluation of system efficiency for the special task or reasonableness of the business flow are usually required in the maintenance system of armored equipment. The paper analyzed the process of armored equipment maintenance system. Then a simulation model of a military maintenance process is built on Extend simulation software. By means of statistical experiments, some key results are obtained including the time in finishing the system process, queue length, waiting time and the utilization of the service platform in the process, which could provide solid evidence for evaluating the system efficiency to help make the equipment support plan.
Comparison of Photovoltaic Power Generation Interconnection Standards
Authors: Wang Ji Dong , Zhang Xiao Jing , Du Xu Hao
Published: November 2011

Smart Grid is one of the hot research directions of power system. How to interconnect the new energy power generation with power system safely and reliably is a major challenge in the development of Smart Grid. New energy power generation interconnection standards are the technology base, which will push the development of smart grid. This paper compares the photovoltaic power generation interconnection standards of home and abroad mainly. It points out the inadequacy of existing standards and that the photovoltaic power generation interconnection standards should focus on power quality, protection and control. This paper can be provided as a reference to improve existing standards and establish interconnection standards of other form new energy generation.
Study on Nonlinear Robust Control for Permanent Magnet Linear Servo System
Authors: Lan Yi Peng , Lan Hong Xuan , Zhao Hui
Published: November 2011

Nonlinear robust controllers were proposed for permanent magnet linear servo system. In order to reach accurate track of the motor speed and current, an error system dynamic equation based on the motor nonlinear mathematical model was established. The track and disturbance suppression was summed up the design of nonlinear robust controllers. Two theories used in describing nonlinear robust controllers were obtained by defining proper storage function. The equations of nonlinear robust controllers which met disturbance suppression and asymptotical stability were proved. The results of simulation test indicate that the linear servo system with nonlinear robust controllers can guarantee disturbance suppression and the tracks of input signal.
Speed Sensorless Control System of Mining Locomotive Drive Based on DSP
Authors: Zong Jian , Ruan Yi , Li Zhong Kui , Xu Li Bo , Ye Bin Ying
Published: November 2011

The paper presents a dual closed-loop vector control system based on dsPIC30F6010A for asynchronous motor which is a multi-variables, nonlinear, strong coupling and time-varying system and is difficult to determine precise mathematical model because of changes in motor parameters and load fluctuations in factors. Torque current differential Speed estimation method proposed and experiment results proved this method has satisfactory dynamic response, anti-interference ability and robustness.
The Simulation Study for Auto Electrical Seat Controller Based on Fuzzy Control Technology
Authors: Zhang Lan Jiang , Wang Gui Jie
Published: November 2011

Designed the control system policy for automobile electric seat using fuzzy control technology, therefore established its control model by Fuzzy Logic Toolbox, and carried on the off-line simulation to choose controller's optimum control parameters. From the dynamic viewpoint, the auto electric seat adjustment system is not only a complex nonlinear function which includes the location of the DC servo motor and the speed, but also contains serious nonlinear coupling interference, so the system is a highly nonlinear strong coupling, variable multivariable system. Application of traditional control methods (such as traditional PID) is difficult to meet its order requirements, so the research is highly robust method of intelligent control is an effective way to solve the problem. Fuzzy control technology has become the field in which drawn greater attention and researched in recent years. It doesn’t depend on the mathematical model of controlled object, has a good robustness, and nonlinear control characteristics, so it is an effective means to control the object with time-varying, non- linear parameters. In this paper, fuzzy control technology to achieve the orders of auto electric seat adjustment control system functions in the Literature [1], and the tracking of the system was simulated.
The Modeling and Simulation of EGCS Based on Matlab/Simulink
Authors: Han Kun , Feng Xiao Yun , Yu Xin Yun , Xiong Cheng Lin
Published: November 2011

This paper models EGCS based on the analysis of EGCS structure, and furthermore, writes modularized program utilizing Matlab C-mex language. The paper also sets up a simulation platform in the Matlab/Simulink simulation environment to perform the group control simulation of 4 20-floor elevators based on the minimal waiting time group control algorithm. With testing, the result of the testing shows that the research platform can satisfy the research requirement of the Elevator Control Strategy.
Reentry Trajectory Optimization of Airbreathing Hypersonic Vehicles Based on Gauss Pseudospectral Method
Authors: Yang Bo , Sun Shang
Published: November 2011

According to the nonlinear, multivariable and multi-constraint features of the reentry trajectory optimization problem of airbreathing hypersonic vehicles, a suboptimal solution method is developed. The reentry trajectory generation is converted to a nonlinear programming (NLP) problem by using Gauss pseudospectral method (GPM). The state and control variables on Gauss nodes are chosen as parameters to be optimized and the minimum total heat absorption is chosen as the optimal performance index. Then the sequential quadratic programming (SQP) method is used to solve the NLP problem. The states of optimized trajectory are compared with the states obtained by the integral of kinetic equations. By simulating on an example of airbreathing hypersonic vehicles, it is demonstrated that the above method is not sensitive to the estimate of motion states and is easier to converge. And the method is effective to solve trajectory optimization problems.
Modeling and Simulation for Super Capacitor Braking Energy Recovery Process of Micro EV
Authors: Qu Jin Yu , Liang Li Yan
Published: November 2011

Super-capacitor is suitable as braking energy storage device for electric vehicle because of its high charge and discharge rate, long life, simple structure and reliable performance advantages. When driving motor of the electric vehicles runs on regenerative electric power state, it can not only provide braking force, but also charge to the energy storage device to recover the kinetic energy, thus endurance mileage of electric vehicle can be extended considerably. In this paper, braking energy recovery model was built by using the Matlab/Simulink software, and whole vehicle model based on automobile theory, the motor efficiency model and super-capacitor model were mainly included. Meanwhile some researches were made on the simulation, and the impact of the super-capacitor on the braking energy recovery was analyzed.
Normalized Energy Stability Margin Based Analysis of Omni-Directional Static Walking of a Quadruped Robot on Rough Terrain
Authors: Zhang Lei , Gao Shan
Published: November 2011

With Normalized Energy Stability Margin(Sne ) as stability criterion, this paper studies the tumbles of omni-directional static walking of a quadruped robot around the line connecting two adjacent supporting legs on rough terrain, proposes the method to improve the stability of quadruped robot by increasing the (Sne ) value, which is realized by lowering the height of center of gravity(COG), and finally substantiates the feasibility of the method through a simulation experiment.
Front Car Door Modal Analysis Based on Finite Element Method
Authors: Sun Li , Liu Yong Chen
Published: November 2011

The car door modal analysis was an important method to obtain its dynamic characteristics. In order to analyze the natural frequency of the door, avoid resonance with the other vibration sources in the vehicle structure and reduce traffic noise, the right front door of a vehicle was made modal analysis based on the finite element method. First, the car door three-dimensional model was established in the CATIA, then it was imported into the HyperMesh to mesh, at last, imported into the Nastran, and the related settings was made to calculate the 7 modal frequencies of the door. By analysis of the vibration shape chart, the door low stiffness positions are found to provoid the reliable reference for optimizing the door design.
Fuzzy Control and Simulation Studies of Hot Rolling H-Beam’s Water Supply System
Authors: Yu Xiao Guang , Chu Hong Chao , Liu Jian
Published: November 2011

We have designed Fuzzy controller to the hot rolling h-beam’s water supply system based on Fuzzy toolbox of Matlab software, we also analyzed the limitations of conventional Fuzzy controller, and puts forward the corresponding improvement measures, which is adding integral functions in Fuzzy controller to eliminate static errors existing at traditional Fuzzy controller. We also adopted Smith predictor to estimate lag phase effects for stability of the system. Simulation results showed that, the controller encompasses rapid responsiveness, excellent stability and strong robustness.
Simulation of Permanent Magnet Synchronous Motor for Electric Vehicle Indirect-Torque Control System
Authors: Wang Chun Liu , Li Jin Jian , Feng Xiao Yun
Published: November 2011

For the request of electric vehicle on drive motor, the permanent magnet synchronous motor (PMSM) get more and more attention by its small size and torque characteristics. By analyzing the traction motor characteristics with a constant torque starting and constant power operation, the space vector pulse width modulation (SVPWM) algorithm is used to replace the switching table for direct torque control (DTC) strategy. By analyzing the mathematical model of the PMSM, for the existence of permanent magnets, the rotor coordinate system is applied when calculating the stator flux. Meanwhile, the electric vehicle starting block and the brake block are simulated for the characteristics of that walk namely stop. The results show that the speed has a smooth transition and the torque has a quick response.
Low-Speed Turning Back Simulation and Evaluation of a Car Based on ADAMS
Authors: Liu Yong Chen , Sun Li
Published: November 2011

Vehicle’s turning back performance was an important aspect of handling and stability. Good and suitable turning back performance can reduce effectively the driver’s fatigue and busy. Taking a car for example, in the ADAMS software, the car’s dynamics model was established. According to ISO 4138 and ISO 8855-1991 standards, low-speed turning back virtual test was carried out, and then apply the QC/T 4801 1 999 limit vehicle handling and stability indicators and assessment methods to evaluate the results of the simulation, the result is 86.50835 points, indicating that the model performance of the low-speed turning back is very good.
A New Method of Fault Diagnosis with Soft Set Theory
Authors: Sun Xiao Lei
Published: November 2011

The soft set theory is a kind of new and effective tools to deal with the uncertainty. In this paper the principle and operations of the soft set theory was introduced briefly. The application in fault diagnosis was presented for the first time. An example was given to show this method valuable.
Design of Random Combination System Based on Five Common Kinds of Mechanical Transmission
Authors: Qin Ru Ming
Published: November 2011

Introduce system’s overall function design concept and key technologies. The system is divided into driving module and driven module. According to the depth of calling, the system can also divide into four application modules, and is developed in coordination with Visual Basic 6.0, Visual FoxPro 6.0 and Visual LISP. Each module uses Windows and AutoCAD as executive support system. Under the control of interface program, the module can automatically execute and transmit data. Focus on the program interface design of the driving module. Users can be allowed to arrange and combine five common types of mechanical transmission. 3905 kinds of transmission scheme that is less than five levels can be got. The system can finish total design computation, work capability computation, tolerance database inquiry and drive part drawing drafting automatically and continuously. Mechanical design efficiency can be greatly improved.
Modeling and Analysis of a Turbidostat Model with Monod-Type Kinetics and State Feedback Control
Authors: Tian Yuan , Chen Lan Sun
Published: November 2011

In this paper, a turbidostat model with single species for an inhibitory growth-limiting nutrient is considered. The dilution of the turbidostat is controlled by a critical cell concentration in the bioreactor. It is shown that the limit system of the proposed model has a coexistence equilibrium which is global asymptotically stable. Moreover, it is shown that the limit system doesn’t exist limit cycle in the first quadrant. In addition, it presents the discussion of the bioprocess optimization.
Risk Assessment Model of Automobile Defect Based on Weibull
Authors: Huang Guo Zhong , Wang Yan , Chen Ying , Wang Jing
Published: November 2011

This paper analyzed the automobile defects and its risk characteristics; the Event Tree Analysis (ETA) method was introduced to determine the risk flow route of automobile defects. According to the scattered of automobile, a risk forecast method based on the Weibull distribution is established. Based on the thousand vehicle breakdown number for risk probability forecast, propose a risk assessment model of automobile defect. The results indicate that on gathering actual failure data from after-sales service, the Weibull distribution model has a favorable applicability for forecasting risk possibility.
The Switched Control of Single Phase Active Power Filter
Authors: Zhang Yong Feng , Cheng Xin Gong , Zong Xi Ju , Miu Qing Qing , Chen Xiao Hong , Wang Yan Liang , Chen Gang
Published: November 2011

This paper proposes a novel control approach for single phase active power filter (APF) based on switched system theory, since the switching performance of APF. The switched model of APF is established by means of switching function. On this basis, the switched system error model is obtained. After that, a quadratic Lyapunov function is design to determine the switched control law. The switched control can make the switched system asymptotically stable and compensate the distorted current caused by the nonlinear load current. The effectiveness and rationality of the proposed approach is confirmed by the simulation result compared with the linear voltage control approach.
Study on the Safety Design and Test Method of Ultrasonic Cleaning Device for the Motor Winding
Authors: Zhang Hai Peng , Sun Jun Zhong , Chen Xin Gang
Published: November 2011

When the dirt was cleaning away by the ultrasonic cleaning device, the insulating layer of the motor winding would be destroyed and the motor safety would be affect. The destructive effect mechanism is analyzed, a enameled wire-based destructive experiment method was designed. Finally the selection of cleaning power and time were realized. It was indicated by the motor experiments that the cleaning parameters selected in this way didn’t destroy the insulating layer of the motor winding, and was an excellent method to ensure the safety and reliability of the designed ultrasonic cleaning method.
Pressure Analysis of Hydraulic Pumping System of Concrete Pump
Authors: Qiu Weng Ning , Wei Hong Yu
Published: November 2011

By means of power linkage chart method, the model of closed loop pumping system of concrete pump was set up and simulation was carried out in the Matlab. The results show that the hydraulic shock in the closed loop did not occur at the rapid commutation of piston pump and it actually happened when the concrete was pushed forward after compression. The main piston pump commutation is soft action and this shock can be eliminated effectively by means of “SN” control. Closed loop delivery system is used more widely in high volume concrete pumps and is featured by advantages like energy saving, smooth commutation and low hydraulic shock. In this paper, by means of power linkage chart method, the model of the system was set up and dynamics equations set of the system was obtained. A simulation model was set up by means of simulation toolkit in Matlab language – Simulink, in order to have simulation study of commutation shock of the pumping system and shock due to pushing load and obtain the transient performance of model in time domain.
Study on Rapid and Non-Destructive Identification of Starch Categories with NIR (Near-Infrared Reflectance)
Authors: Sun Xiao Rong , Liu Cui Ling , Wu Jing Zhu , Li Hui
Published: November 2011

We conduct rapid and non-destructive experimental studies on various starches based on NIR and cluster analysis (a kind of quantitative analysis), taking a total of 54 samples from two starches as subjects, and study the feasibility of identifying starch categories with the combination of NIR and cluster analysis. The samples are identified quantitatively through cluster analysis (a kind of spectrum pattern recognition) under NIRDRS (near-infrared diffuse reflectance spectroscopy) with spectrum from 8914-1 to 4000-1 cm. Researches indicate that once the spectra are pre-processed trough vector normalization, samples can be classified into two categories accurately with cluster analysis, with a precision rate of 100%.In the meantime, the accuracy rate from experiment is also 100% when using the prediction set samples to test the accuracy of the model built. As research shows, a combination of NIRDRS and cluster analysis provides an accurate and reliable method to recognize starch categories rapidly and non-destructively.
An Empirical Model for a Variable Speed Refrigeration System
Authors: Li Hua , Fei Ji You
Published: November 2011

This paper deals with an empirical dynamic model for decoupling control of the variable speed refrigeration system (VSRS). To cope with inherent complexity and nonlinearity in system dynamics, the model parameters are first obtained based on experimental data. In the study, the dynamic characteristics of indoor temperature and superheat are assumed to be first-order model with time delay. While the compressor frequency and opening angle of electronic expansion valve are varying, the indoor temperature and the superheat exhibit interfering characteristics each other in the VSRS. Thus, each decoupling model has been proposed to eliminate such interference. Finally, the experiment and simulation results indicate that the proposed model offers more tractable means for describing the actual VSRS comparing to other models currently available.
An Improved Geomagnetic Matching Algorithm Using Rotation Angle Search Technique
Authors: Liu Ya Jie , Zhao Yan , Wu Fa Lin
Published: November 2011

The accumulation course angle error of inertial navigation system will decrease the accuracy and reliability of an geomagnetism aided inertial navigation system using a geomagnetic contour matching algorithm. To improve the matching accuracy, the matching track and true track should be as parallel as possible. An improved geomagnetic matching algorithm is presented by introducing rotation angle search technique. To reduce the computation burden, improve operation efficiency and reduce false matching probability, a new search area determination method is proposed, which redefines the search region and reduces the search range. Simulation results demonstrate the effectiveness of the proposed algorithm and the improvement in the matching accuracy.
Application of Improved Fuzzy PID Control Algorithm in Heating Furnace
Authors: Wang Hong Jun , Li De Xiong , Qi Hui Juan , Liu Li Na
Published: November 2011

e furnace of steel plant is a complex controlled object and it has the properties of nonlinear, Time-varying and delay. Its modeling and control are very difficult. The temperature control of the furnace mainly depends on the control of gas flow. Therefore, the study of a reasonable gas flow control program is the key to increase the level of heating control. In this paper, an improved fuzzy PID control algorithm is proposed, in which, PID control algorithm and fuzzy control algorithm are integrated together, and its characteristics are improved according to feature of furnace. This made the algorithm to have good adaptability and Interference capability. The simulation results show that the improved control algorithm is better than traditional algorithm in overcoming the non-liner, delay of the object and the performance is excellent.
Composition Analysis of Ge Graded Si1-xGex Alloy Films by Capacitance-Voltage Method
Authors: Yang Y. , Yu F. , Han Ping , Ge R.P. , Yu L.
Published: November 2011

Capacitance-voltage method was used to analyze composition of the Si1-xGex alloy films with a stochiometry gradient of Ge, which were epitaxially grown on Si (100) substrate by chemical vapor deposition. Using the capacitance characteristics of Si1-xGex/Si obtained by applying a reserve bias to the Hg electrode probe, the contact barrier height for Hg/Si1-xGexjunction and Si1-xGex/Si junction, and band gap of SSi1-xGex were estimated respectively. With the band gap of Si1-xGex, composition of Si1-xGex in Hg/Si1-xGex junction and Si1-xGex/Si junction were further obtained. Because analyzed Si1-xGex was formed through bilateral inter-diffusion of Si into the epilayer and Ge into the substrate during the deposition, Ge distribution from surface to substrate in Si1-xGex alloy films can be figured out by fitting to diffusion exponential function. The Ge distribution acquired this way was in accordance with the depth profile by auger electron spectrum.