bluuebunny/crossref_metadata_2025 huggingface dataset:
Modeling of the Three-Phase Asynchronous Motor Based on MATLAB/Simulink
Authors: Liu Hai Jun , Wang Jin Long , Bao Fang Di
Published: March 2013

On the basis of the mathematical model of asynchronous motor combined with two-axis theory of revolving frame transformation simulating model was established under the environment of MATLAB/Simulink. At the same time, by using this simulation model, the analysis of the starting procedure of asynchronous motor was presented to demonstrate its correctness and such merits as quick response, flexibility, convenience, intuition and so on.
Indirect Optimization for Finite-Thrust Orbital Interception Problem
Authors: Huang Yan Yi , Chen Guo Dong
Published: March 2013

The nonlinear programming method is used to study the finite-thrust minimum-time orbital interception problem. Considering the spacecraft with fixed impulse, the Modified Equinoctial Elements are used to describe the movement of the spacecraft in the attached coordinate, and the model of the orbital interception problem is established. Then the trajectory optimization problem is solved by the nonlinear programming method. The simulations demonstrate that the minimum time orbital interception mission is well accomplished, and the spacecraft fly around the earth with maximum thrust magnitude at whole time history.
The Use of Porous Silicon for Nanostructuring of Functional Metal Layers for MEMS
Authors: Timoshenkov Sergei , Gaev Dahir , Boyko Anton
Published: March 2013

The results of studies relating to the use of porous silicon as the basis for the creation of nanostructured getter layers for MEMS are presented. New technical solutions, in which the porous silicon with pores of micro- and nanometer range is used as a matrix for the deposition of reactive metals or metal alloys, were developed. The research results can be used to create getters for MEMS, as well as in other areas which require the creation of structures with a developed surface.
Simulation of the Integrated ABS and DYC Control for 4WID Electric Vehicle with Regenerative Braking
Authors: Yang Fu Guang , Ruan Jiu Hong , Li Yi Bin
Published: March 2013

Study the lateral stability control method with regenerative braking for 4WID electrical vehicle whiling braking, an integrated control strategy with primary objective to enhance vehicle lateral stability was proposed, by which the regenerative braking, hydraulic braking, ABS and direct yaw moment control system were coordinated effectively. Simulation results on split-μ road indicated that compared with traditional ABS, the integrated control method can improve the lateral stability of vehicle at urgent braking condition, and increase the mileage of electric vehicles.
Defect Free Casting by Using Simulation Software
Authors: Choudhari C.M. , Padalkar K.J. , Dhumal K.K. , Narkhede B.E. , Mahajan S.K.
Published: March 2013

The use of Aluminum castings parts in the automotive industry has increased dramatically over the past few decades. The driving force for this increased use is vehicle weight reduction for improved performance. In many cases the mechanical properties of the cast aluminum parts are superior to those of the cast iron or wrought steel parts being used.This paper proposes the computer simulation of the sand casting of Aluminum Plate. It aims to study the behavior of fluid flow during mould filling and solidification and to optimize the process parameters, which help to predict and control casting defects such as gas porosity and shrinkage porosity. Here an attempt is being made to model and simulate the casting process using the AutoCAST software. The technological as well as practical aspects of using casting software are illustrated with an industrial case study.
Design and Analysis of Nonlinear Autopilot for Tactical Missile
Authors: Wang Lei , Qi Zai Kang
Published: March 2013

A compromise design approach for nonlinear autopilot for tactical missile is detailed from an application point of view. The nonlinear actuator is treated by description function. The damping loop and acceleration loop is dealt with using separation design strategy, respectively. The feasibility and correctness of this proposed method is validated by simulation results.
Calculation Model of Exergy Cost Based on Thermoeconomics Structure Theory and Thermoeconomics Accounting Mode
Authors: Liu Sha , Wang Pei Hong
Published: March 2013

Thermoeconomics combines the thermodynamic analysis and economics evaluation, and simultaneously considers the thermodynamics and economics effect of the process of energy conversion in power plant. It becomes the focus of research. This paper mainly discusses the establishment method of the exergy cost equation in thermoeconomics structure theory, at the same time this method also combines with thermoeconomics accounting theory. Through the research, this paper presents a clear, simple, utility exergy cost equation established method. Compared with the chain differential principle, this method has the advantages of a simple form of expression and faster calculation speed. The method is applied to an actual 600MW power plant, established exergy cost equation and obtained the exergy cost for each component.The exergy cost concept is used to evaluate the production performance of the major equipment, to find the reason of production cost growing and direct the thermal power systems exergy optimization.
Effects of LiCF3SO3 on PVDF-HFP/MG49 (70/30) Based Blend Polymer Electrolyte
Authors: Ataollahi Narges , Ahmad Azizan , Hamzah Harun Haji , Rahman Mohd Yusri , Mohamed Nor Sabirin
Published: March 2013

Poly (vinylidene fluoride-hexafluoro propylene) (PVDF-HFP), Poly (methyl methacrylate)-grafted natural rubber (MG49) (70/30) complexed with different compositions of lithium trifluoromethane sulfonate (LiCF3SO3) based solid polymer electrolyte has been prepared using solution casting method. This work has demonstrated that conductivity values were found to depend upon the concentration of LiCF3SO3. The highest ionic conductivity was 1.97×10ˉ4 S cm-1at 25 wt. % of LiCF3SO3 at room temperature. X-ray diffraction (XRD) indicates decrease in the degree of crystallinity by increasing of salt concentration.
An Iris Image Acquisition Method Based on Embedded System
Authors: Sun Qi Jian , Ma Zheng
Published: March 2013

Capturing an iris image rapidly is required for iris image acquisition embedded system. For the traditional method, an iris image must firstly pass through the quality evaluation, which is complex, so the acquisition speed is very slow. This paper described an iris acquisition embedded system, and a new capturing method. The system includes an DSP DM642, and some relevant peripherals. When an image is acquired, it is filtered by the capture-control function, if passed then be stored the image, until capturing the assigned amount. Using this method, we can rapidly capture the high quality iris images at about 0.8s, and 83% of the stored images can be used for the next procedure. At the same time, it is convenient for the user to capture.
Method of Forecast Wind Speed Based on Wavelet Analysis and Quantile Regression
Authors: Lv Peng , Jiang Cheng Fei , Cui Bing Wei
Published: March 2013

Because of wind speed with the randomness and non-stationary properties, wind power has a great effect when it integrates to power grid. We can only prediction a more accurate wind speed to reduce its harmful of the power grid. However, it is difficult to make more accurately forecast because of its characteristics. This article we discuss a method that wind speed processed by wavelet at first, then giving a different quantile points forecast of each layer of wind speed decomposition using the quantile regression, finally we gain the differential forecast by reconstruction every layers predict. The result shows this method prediction effect is better than quantile regression forecast and ARMA model prediction, especially in the extreme points.
A Method for Extracting Characteristic Frequency Components of Blood Flow Signals Based on Wavelet Transform
Authors: Cui Ruo Fei , Luo Si Te , Lu Li Qian , Zhou Wei Wei , Li Zeng Yong
Published: March 2013

The objective of this paper is to propose a method for exacting the characteristic frequency components of blood flow signals based on wavelet transform. The wavelet transform technique, a time-frequency method with logarithmic frequency resolution, was used to analyze oscillations in human peripheral blood flow measured by laser Doppler flowmetry (LDF). In the frequency interval from 0.008 to 2.0 Hz, the LDF signal consists of components with five different characteristic frequenciesmetabolic (0.008-0.02Hz), neurogenic (0.02-0.06Hz), myogenic (0.06-0.15Hz), respiratory (0.15-0.4Hz) and cardiac (0.4-2.0Hz). The five frequency components were extracted in time domain and reconstructed using cubic spline interpolation in this study. The results showed that it was an effective way to extract each component of blood flow signals.
Research on Fault Diagnosis Methods for Mixed-Signal Circuits
Authors: Zhou Xun , Wang Xiao Li
Published: March 2013

In terms of the developing actuality of mixed-signal circuits, several familiar diagnosis methods are introduced in the paper including the basis principle, the merits and demerits for each method. At the same time, the design for testability based on Boundary scan is discussed. At last, the developing trends of this field is predicted.
Based on the Max038 Digital Function Signal Generator Design
Authors: Wang Yi Jun
Published: March 2013

£oIn this paper, based on analysis of existing signal generator according to the system of indicators to a reasonable use of single-chip high-frequency precision function generator MAX038 control to produce the periodic waveform of the triangle wave, sine wave and square wave three. MAX038 chip as the core, the use of converters, digitally controlled potentiometers, electronic switches, proportional amplifier waveform type, amplitude, frequency programmable to adjust. The design frequency of mediation a wide range of high stability, and display are intuitive and easy to control. The high precision affordable price can be widely used in a variety of electronic measurement and control applications. Confirmed by the measurement of the effectiveness and feasibility of this program.
Reliable Sample and Order-Based Repeatable Analysis of Unstable Signal of Automobile Transmission
Authors: Mei Jian Min , Li Feng , Xiao Yun Kui
Published: March 2013

A system that can control theunstable running process of automobile transmission repeatedly and sample thesignal consistently is designed, the unstable signal of automobile transmissionwith changing rotate speed is sampled by this system, and analyzed by themethod of order to ascertain the best test position corresponding to the speed,then the system’s repeatability of test is identified. The results ofexperiment and analysis show that the system can control the repeatableexecution of unstable running process of automobile transmission stably, so theproblem of repeatable test of unstable running process is well solved, and thatthe unstable signal of automobile transmission is analyzed by order and theinformation of mesh order is extracted effectively, and the analytical effectis clear and stable.
Research on Interpolation Algorithm for DSSS Signal Receiver
Authors: Yang Zhi Qun
Published: March 2013

For Direct Sequence Spread Spectrum (DSSS) receiver, a parallel acquisition algorithm based on FFT-IFFT is proposed to improve speed of the DSSS signal acquisition. In order to ensure the FFT data points is equal to a power of 2(2N), Interpolation Algorithm is always used. In this paper, three interpolation algorithms are introduced in detail, and they are analyzed theoretically and compared by quantitative simulation, the resources occupied and test performance verification. We draw the conclusion that the linear interpolation is the optimal algorithm which offers the effective technique for the implementation of DSSS signal receiver.
Adaptive Predict Control of Nonlinear System Based on a Modified Neural Network
Authors: Nian Shan Po , Hou Cai Xia , Chen Lei , Gong Run Kun , Peng Li
Published: March 2013

Based on a modified neural network with a new structure and a fast algorithm, an approach on adaptive predictive control is represented in this paper. Advantage of neural network modeling accuracy and good control performance of the optimal predictive control are combined. In the meantime, we can take the nonlinear network model output as a kind of measured disturbance, which is overcome in predictive feed-forward control. So the approach achieves satisfied control effectiveness.
The Future Manufacturing System and Cloud Computing
Authors: Jeong Hwa Young , Hong Bong Hwa
Published: March 2013

Modern manufacturing system and processes are becoming increasingly complex, and requesting much function and tools to user. It also is operating in highly dynamic environments. Traditionally, flexible manufacturing system (FMS) was used. Nowadays, communication networks are available to virtually every aspect of the manufacturing environment. In the contents, manufacturing system with cloud computing is a good example. In this paper, we consider the cloud manufacturing system and their future works.
Research of FPGA Based LXI Bus Clock Synchronization Technology
Authors: Li Ming , Wang Zhi Qiang , Liang Guan Hui , Gao Qing
Published: March 2013

As to the insufficient of difficulties to achieve sub-microsecond accuracy in full software implementation of LXI bus synchronization. Studies the LXI bus synchronization triggering and advances, the design program of FPGA-based hardware-assisted to achieve IEEE1588. Which lays a good foundation for the design and implementation of the Class A and Class B instruments.
Deposition and Characterization of Chromium Doped Tin Oxide Transparent Conducting Thin Films Prepared by Spray Pyrolysis Technique
Authors: Abdi M.H. , Ibrahim N.B. , Mohagheghee M.M. Bagheree
Published: March 2013

Emergenceof innovative technological deposition technique of spray pyrolysis enabled the enhancement of structural, optical, and electrical properties of Sn1-xCrxO2 (x=0.0, 0.02, 0.04, 0.06, 0.10, 0.15) transparent semiconductors thin films in the present study. To evaluate these properties, X-Ray diffraction (XRD) spectroscopy were usedto study the elemental component and the crystalline nature of the materials while the optical properties and structure of the samples were evaluated using UV—vis spectroscopy and field emission scanning electron microscopy (FE-SEM).Finding showed that the Cr-doped SnO2 films were tetragonal in shape. Transmission spectra of the deposited films showed high transparency of ~ 70-90% in visible region with optical edge of 3.7eVfor SnO2. Resistivity of pure tin oxide samples was 0.01 Ω-Cm and increases with increase in dopant level. The Hall voltage showed that the type of semiconductor changed with increasing of dopant.
Effects of Elements Composition on Tribological Properties of PES/Metal Matrix Composite Materials
Authors: Luo Zhi Gao , Li Jin , Zhao Bing , Xu Jian Wei
Published: March 2013

The friction and wear characteristics of PES/metal matrix composite materials were tested by the ball-disc friction pair of UMT-2 friction and wear test machine. The plastic layer is composed of distinct components. The results showed that: the tribological properties of PES/metal matrix composites were improved significantly after added 5wt % of the LCP. With the increasing of PTFE the PES/metal matrix composite material friction coefficient and wear rate were decreasing when the load of 10N and rotating speed of 400rmp. But the friction coefficient and wear rate increased when the mass fraction of PTFE more than 22 wt %. The tribological properties were the best when the PTFE content was 18 wt % to 25 wt % in the plastic layer.
Development of New Hybrid Shell Element Takinging the Normal Stress into Account
Authors: Lu Hong , Huang Wen
Published: March 2013

The calculation of the stress distribution in the forming stage of sheet metal forming is critical to the accuracy of springback simulation. In order to improve the accuracy of stress prediction, a new mixed shell element is presented. Two pseudo nodes are added in the thickness direction so that the normal strain can be calculated using the displacements of the nodes. Mixed formulation is used instead of that of pure displacement. As a result, the accuracy of stress prediction is improved. Examples are given to show the improvement.
Preparation of Waterborne Graphite Conductive Coating and Study of Its Electromagnetic Shielding Performance
Authors: Wang Wei Dong , Xu Qing , Zhou Shuang Xi , Deng Wen Wu
Published: March 2013

A waterborne coating of waterborne acrylic resin based material was developed with different sizes of hybrid homemade graphite as conductive filler. Effects on its electrical conductivity and electromagnetic shielding performance were further analyzed and tested, such as conductive filler, coupling agent and iodine addition. The results showed that coating volume resistivity was about 0.05Ω·cm according to the optimal proportion, and attenuation of electromagnetic wave could reach more than 30dB within the frequency range of 1 MHz~1.5 GHz.
Stator Temperature Distribution of AC Machine Based on Fluid Flow Field
Authors: Huang Cong Hui , Wu Xin Zhen
Published: March 2013

In order to study the impacts of the stator ventilation structure on the thermal performance, the fluid flow model of the stator radial ventilation ducts is established. The fluid flow fields are calculated and analyzed, from which the three-dimensional fluid field distribution inside the radial ventilation ducts is shown. Subsequently, the heat transfer coefficients are obtained on the basis of calculated results of the fluid flow field, and the stator three-dimensional temperature fields are solved. The numerical results are compared among different inlet velocities at the entrance of the radial ventilation ducts, which provides a theory basis for the design of the cooling system and improves the safe operation level of the generator.
Current-Voltage and Capacitance-Voltage Characteristics of Pd Schottky Diodes Fabricated on ZnO Grown along Zn- and O-Faces
Authors: Faisal M. , Asghar M. , Mahmood Khalid , Willander Magnus , Nur O. , Klason Peter
Published: March 2013

Temperature dependent current-voltage (I-V) and capacitance-voltage (C-V) measurements were utilized to understand the transport mechanism of Pd Schottky diodes fabricated on Zn- and O-faces of ZnO. From I-V measurements, in accordance with the thermionic emission mechanism theory, it was found that the series resistance Rsand the ideality factor n were strongly temperature dependent that decreased with increasing temperature for both the faces (Zn and O-face) of ZnO revealing that the thermionic emission is not the dominant process. The barrier height øB(I-V)increased with increasing temperature for both faces. The measured values of ideality factor, barrier height and series resistance for Zn- and O-faces at room temperature were 4.4, 0.60 eV, 217 Ω and 2.8, 0.49 eV, 251 Ω respectively. The capacitance-voltage (C–V) measurements were used to determine the doping concentration Nd, the built-in-potential Vbi, and the barrier height øB(C-V). The doping concentration was found to be decreased with increasing depth. The barrier height øB(C-V)calculated for O-polar and Zn-polar faces decreases with increasing temperature. The values of barrier height øB(C-V)determined from C-V measurements were found higher than the values of barrier height øB(I-V). Keeping in view the calculated values of ideality factor, barrier height, and series resistance shows that O-polar face is qualitatively better than Zn-polar face.
The Study of Parameter Robustness of Induction Motor Variable Frequency Speed Regulation Adaptive Inverse Control System
Authors: Zhang Guang Rui , Xue Jian
Published: March 2013

Aiming at the problem that the existence of the time varying parameter in the induction motor variable frequency speed regulation system influence the induction motor speed control performances through influences on the vector control decoupling performances, the author puts forward the solution that is to apply the adaptive inverse control scheme to the induction motor speed control system. Research findings suggest that adaptive inverse control is of high parameter robustness to both gradient parameter perturbation and mutational parameter robustness, which effectively reduces induction motor time varying parameters influences on dynamic and static performances of the frequency speed regulation system.
Implementation of Clock Synchronization in PTN Based on FPGA
Authors: Yan Guo Qiong , Yan Chang Xiang
Published: March 2013

With the PTN network gradually becoming the unity ofthe business group transmission network, clock synchronization is an important issue inPacket Transport Networking (PTN). This paper introduces time synchronizationtechnology of IEEE1588v2 based on FPGA and VHDL. It has more flexibilityimplementation than the foreign professional processing chip, and easy toupgrade. It also solved the low accuracy synchronization problem of softwaretimestamp. With the result of the simulation and testing, this implementationis proved to be available for meeting the requirements of communication systemson clock Synchronization.
Infinite 3D Cubic Lattices of Identical Resistors
Authors: Asad J.H.
Published: March 2013

We expressed the resistance between the origin and any lattice point in an infinite perfect Simple Cubic (i.e., SC) network rationally in terms of the known value of the Lattice Green's Function at the origin (i.e., ), and . On the other hand, we investigated the asymptotic behavior of the resistance. Finally, some numerical results has been calculated.
Intelligent Traffic Control at Intersection Based upon Real-Time Vehicle Detection
Authors: Yao Guo Zhong
Published: March 2013

A new method of traffic control based upon real-time number of the vehicles at the intersection was pulled forward. Serial vehicle detectors were used to detect the number of the vehicle waiting to pass through the intersection. One or more control boxes were used to control the traffic lights according to real traffic condition and transreceived data between itself and the detectors. The information transmission between the detectors and the controllers is based upon 2.4G ISM band. Arithmetic on the system operation, which took the pedestrians and the situation of excessive vehicles into account, is introduced.
Practical Research on Predictive Fuzzy-PID Control in Reactor Temperature Control
Authors: Huang Chang Yuan , Pan Hai Peng
Published: March 2013

Against the characteristics of the temperature in reactor such as time-delay, time-varying and difficulty to build a precise mathematical model in the chemical industry. Through the analysis of dynamic characteristics of the controlled object, the method of fuzzy-PID control was designed based on a predictive model. According to the detected temperature signal, the output deviation of the controller and the on-line identification of prediction model, this algorithm gains the predictive value which uses a generalized predictive model and the fuzzy-PID control. Then compare the predictive value with the reference trajectory to get the deviation. Finally use this deviation and the change of the deviation to optimize the PID control parameters and attain the appropriate amount of system control. The simulation results show that the fuzzy-PID control based on prediction model has strong adaptability, good robustness, control accuracy and higher practical value.
Robust Tracking Control for 3 DOF Helicopter Based on Least Squares Support Vector Machine
Authors: Zhang Jing Mei , Xue Lei , Zhang Rui Min , Sun Chang Yin
Published: March 2013

A robust tracking control method for 3 DOF helicopter via least squares support vector machine with considering uncertainty and bounded disturbance is proposed in this paper. The inversion errors which is brought due to modeling errors and uncertainty can be compensated by least squares support vector machine, and the optimal regulator guaranteed dynamic characteristics of approximate linearization system and response quality of tracking error dynamic. Finally, the stability and convergence analysis of error dynamic system is proven by Lyapunov stability theory and numerical simulations have demonstrated the effectiveness of the proposed approach.
Design of Heavy-Medium Coal Separation Automatic Control System Based on S7-300 PLC
Authors: Zhang Chang Yong , Zhou Zhong Jing
Published: March 2013

This paper focuses on the composition of the Heavy-medium coal separation automatic control system, control methods and its functions. Introduced the main testing instruments and actuator in the control system. The system achieved good results in the Tangshan Rongyi Coal Preparation Company.
Application of PLC in Intelligent Control of Heating Pipe Network
Authors: Ma Yun Feng
Published: March 2013

The traditional heating system just controls the heat source by the PLC,but it dose not control the heating pipe.so it can not solve the problem that it is hot near the heat source but cold when far away from it.The problem of pipe network imbalance also can not be solved.To solve these problems,we design an intelligent control system of pipe network,which combine the traditional heating control system to realize saving energy.This paper introduces the design thought of the application of Siemens programmable controller in heating pipe network,and elaborate on the hardware design and the software programmable of the control system.The actual system operation shows that the remote monitoring system of heating pipe network based on Siemens PLC is high reliability and high stability, and the effect in energy saving is remarkable.
Precisie PID Temperature Control Based on LabVIEW
Authors: Wang Hong Yu , Lu Xin , Tian Jian
Published: March 2013

A PID temperature control system was designed with the LabVIEW graphical programming language and the PID toolkit. Data collection, PID control, data record and data check were experimented to the practicable instrument with the purchased programming power supply and data collection record system. Operate the hardware and software of the computer with the virtual instrument and realize the smooth control of the system temperature with the accuracy of 1.
Planar Tracking Control for Multiple Underactuated AUVs under Formation Constraint
Authors: Liu Hai Lin , Tang Gong You , Xu Qi Lei , Yu Hao
Published: March 2013

T coordinate formation control for multiple underactuated AUVs. An optimal performance index is proposed to give attention to both tracking quality and formation constraint. A reference feasible trajectory for the position and orientation based on velocity control is planned so that it is consistent with vehicle dynamics. And the performance index is transformed to the error one. The optimal controller is designed to solve the problem. Using the controller we demonstrate the physical realization of control system at the same time. Simulation results validate that the proposed formation methodology are presented and discussed.
Torque Optimization of Double-Stator Switched Reluctance Machine
Authors: Abbasian Mohammadali , Hanaeinejad Vahid
Published: March 2013

Double-stator switched reluctance machines benefit from a high torque density and a low radial force level in comparison with conventional switched reluctance machines resulting in a lower vibration and acoustic noise. Therefore, they are suitable candidate for automotive applications. However, torque pulsation which is also a source for vibration is still remained and should be alleviate by dimension optimization of the machine. This paper presents a design optimization of a double-stator switched reluctance machine for improving the magnetic torque quality of the machine. For this purpose finite element method along with response surface methodology is used to optimize three parameters of the machine to maximize torque quality factor i.e. the average torque to torque ripple ratio in the machine. Genetic algorithm method is also employed as an optimization tool. The aim of optimization is to maximize the ratio of average torque to torque ripple. Finite element results are presented to verify the optimization method.
Multi-Objective Disturbance Attenuation Control for T-S Fuzzy System with Hard Constraints
Authors: Gao Xing Quan , Meng De Hua
Published: March 2013

This paper exploits a multi-objective control technique for T-S fuzzy system with hard constraints, which include actuator saturation and state constraints resulting from some mechanical structure constraints. The disturbance attenuation performance is characterized H norm, while requirements for respecting hard constraints are specified by the generalized H2norm. The T-S fuzzy system control problem is then formulated in a mixed H /generalized H2control problem , and an state feedback solution is derived using LMI optimization.
Robust Tracking for BLDCM System Based on Unknown Differentiable Deadzone Nonlinearity
Authors: Shi Zhi Guang , Huo Wei
Published: March 2013

In this paper, trajectory tracking control of the brushless DC motor system (BLDCMS) with parameter unknown deadzone nonlinearity and viscous friction is investigated. Firstly, a global differential homeomorphism based on the recently established differentiable deadzone model is developed to linearize BLDCMS. Then, a model reference robust controller is presented to suppress the uncertainties. Finally, uniformly ultimate boundedness of the closed-loop system is proved and simulation results show validity of the proposed controller.
Synchronous Control System for Envelope Machine Using DSP
Authors: Zhu Wei Xing , Cai Yong Gang , Zhang Jian
Published: March 2013

In order to meet the requirements of paper envelope production automation, a synchronous control method for multiple AC servo motors is proposed and the four AC servo motors synchronous control system for paper envelope production base on a DSP is designed. In this system, DSP works as core of control, and four HCTL_2020 counters are used as decoding circuit to realize signal feedback. Feedback signals are the output signal of optical encoder on the AC servo motors, which connect to the corresponding decoder respectively. The output signals of four decoders connect to the GPIO ports of DSP in parallel. Real-time speed and position information of motors are obtained by computing unit of DSP. The PID control algorithm is designed to realize synchronous precision of four motors in speed and position. The field experiment results show that the control method is practical and the system has good stability, accuracy and efficiency in paper envelope production.
The Influence of Moment of Inertia to Induction Motor Rotation in Sensorless Direct Torque Control and Duty Ratio
Authors: Gunawan Ridwan , Luniara Siregar Muhammad , Yusivar Feri
Published: March 2013

The vector control has become the first alternative in control of three phase induction motor. One of the vector control method which is commonly used is the direct torque control (DTC) method. However, this system has drawback due to the existence of torque ripples. The addition of the duty ratio control base on fuzzy logic can give better performance compared to conventional DTC. By doing an examination on DTC and duty ratio using small, medium and big capacities of three phase induction motors can be shown the influence from moment of inertia to rotor rotation. This paper uses MATLAB SIMULINK for the simulation study with three types of motor power, for example 1, 10 and 50 hp. It is shown that using the same parameters, a motor with a larger moment inertia gives a better performance in comparison to a motor with smaller moment of inertia.
Modeling and Delay-Dependent Stability Analysis of Multi-Sampling Rate MIMO Networked Control System with State Feedback
Authors: Liu Dian Ting , Zhang Cui
Published: March 2013

A kind of multi-sampling rate MIMO Multi-Input & Multi-Output) networked control system with state feedback in which the controller of each control loop is connected with the sensor and actuator by a network and each control loop has a different sampling period, is studied in this paper. At first its model is set up, and then this linear time-varying multi-sampling rate system is converted into a single high-dimensional linear time-invariant system by lifting technological method. Next the delay-dependent stability condition was deduced based on the Lyapunov stability criterion and the linear matrix inequality approach and the delay systems theory Finally, a given numerical example demonstrates the correctness and the effectiveness of the derivation method in this paper.
Automatic Temperature Measurement System of Accelerated Ageing Test for Fuse
Authors: Shi Jie , Tang Shu Yu
Published: March 2013

In the accelerated ageingtest of fuses, manual measurement was used to collect the temperature of fuse.By this testing method, the errors introduced by human were inevitable. In thispaper, an automatic temperature measuring type accelerated ageing test systemfor fuses was developed. So, the errors introduced by human were overcome.
Study on the Accurate Measurement of Film Thickness
Authors: Xu Zhi Qiang , Qian Kai Guo
Published: March 2013

The thin-film technology is the hotspot of todays material science research.The thickness is an important physical parameter of the film thickness, so measurement naturally becomes the important work of research into material properties. With the wide application of thin film technology and optoelectronic devices, optical films have been widely used in the weaponary basic research and development and production of special devices. Facing the continuous update and development of weapons and equipment, higher requirements are put forward in precision measuring various parameters of the optical film. The thickness of the film is one of the key parameters in film design and manufacturing process, especially the rapid development of nanoscale thin-film technology, making the accurate measurement of the thickness of the film become a hot issue in the field of thin technology research, and has caused concern of technicians.
Thermoelastic Damping of the Axisymmetric Vibration of Laminated Trilayered Circular Plate Resonators
Authors: Sun Yu Xin , Jiang Yan , Yang Jia Ling
Published: March 2013

In this paper, thermoelastic damping of the axisymmetric vibration of laminated circular plate resonators will be discussed. Based on the classical laminated plate theory assumptions, the governing equations of coupled thermoelastic problems are established for axisymmetric out-of-plane vibration of trilayered circular plate with fully clamped boundary conditions. The analytical expression for thermoelastic damping is obtained and the accuracy is verified through comparison with FEM results.
Design of Electric Closed Gearbox Comprehensive Test Bench Based on AC Generation
Authors: Jiao Hai Ning , Wang Zu Lin , Yang Jie
Published: March 2013

This paper designs a new and power-saving electrical power closed loading comprehensive test bench whose characteristic is AC generation. According to the requirement of non-uniform load, the paper applies the advanced virtual instrument technology to monitor and manage the test bench automatically. The results indicate that the test bench has the advantages of simple operation, complete function, high-level automation, easily implementing upgrading and expanding, low cost and remarkable energy saving result.
A Study on Beam Shaping of Helix Antenna
Authors: Qu Xiao Yun , Yang Zhi Qun
Published: March 2013

By optimizing the related parameters of the helix antenna, the maximum radiation direction is changed from 0 degree to 90 degrees. The fast-wave mode is exited along the helix at the same time. The simulation result shows the magic beam shaping performance of helix antenna. The relationship among the radiation pattern, the working frequency, and the parameters of the helix is also described.
Research on Calibration of Semiconductor DC Tiny Current Source
Authors: Liu Chong , Yu Li Hong , Xu Ying Chun
Published: March 2013

Semiconductor DC tiny current source is the equipments that can produce pA tiny current level. It is widely used in aerospace engineering, semiconductor circuit testing, new nanomaterials research, analysis science of development of life, etc with its unique advantages of high sensitivity and resolution in producing tiny current signal. It is a new challenge to calibrate these precise semiconductor DC tiny current sources in metrology. This passage did detailed studies on the domestic and foreign existing calibration methods, then developed a high resistance box, built semiconductor DC tiny current source calibration device, and developed automatic calibration software. In this paper, also the uncertainties of the calibration results had analyzed to fulfill the calibration of this tiny current source.
Influence of Solution Heat Treatment Temperature and Time on the Microstructure and Mechanical Properties of Gas Induced Semi-Solid (GISS) 6061 Aluminum Alloy
Authors: Pajaroen Nitikarn , Plookphol Thawatchai , Wannasin Jessada , Wisutmethangoon Sirikul
Published: March 2013

The influence of solution heat treatment (SHT) temperature and time on the microstructure and mechanical properties of semi-solid 6061 aluminum alloy has been investigated in this study. Microstructure of the as-cast 6061 aluminum alloy mainly consisted of globular α-Al matrix and eutectic phase (α-Al + Mg2Si) at the grain boundary (GB). Iron rich intermetallic phase was also observed at the grain boundary. Eutectic phase started to dissolve after solution heat treatment. The dissolution of eutectic phase increased with increasing solution treatment time, however, the amount of remaining eutectic phase was found to be slightly changed after solution treating longer than 1 h at 550 °C and 2 h at 530 °C. Hardness and tensile results of specimens after artificial aging were utilized to compare and select the optimum solution heat treatment condition cooperating with the microstructural observation. The optimum solution heat treatment condition of the alloy in this study was at 530 °C for 2 h.
Effect of Intercritical Annealing Temperature on Development of Cold Rolled Dual Phase Steel from Q345 Steel
Authors: Liu Ji Yuan , Zhu Fu Xian , Ma Shi Cheng
Published: March 2013

Cold rolled dual phase steel was developed from Q345 steel by heat treatment procedure for automotive applications. The ultimate tensile strength was improved about 100MPa higher than the traditional cold-rolled Q345 steel in the continuous annealing simulation experiment. The microstructure presented varied characteristics in different intercritical annealing temperatures; mechanical properties were changed correspondingly as well. The chief discussions are focus on the recrystallization, hardenability of austenite and martensite transformation in the experiment.
Application of Physics-of-Failure Method in Reliability Engineering of Electronic Products
Authors: Shao Jiang , Zeng Chen Hui
Published: March 2013

Physics-of-Failure (PoF) represents one approach to reliability assessment based on modeling and simulation that relies on understanding the physical processes contributing to the appearance of the critical failures. Firstly the connotation and meaning of PoF method were analyzed here, the inherence relation between PoF and reliability was expatiated, the PoF based reliability method and current reliability method based on probability statistics were compared, their differences and relationships were discussed here. Then the application condition of PoF method in reliability engineering in European and American developed country and China were summarized, the PoF based reliability engineering technologies were introduced systemically from several aspects, such as reliability design and analysis, reliability test and validation, maintain and support. Finally, combining with the developing characteristics of military materiel during the new period, some future investigation directions and application foregrounds were prospected.
Finite Element Analysis and Experimental Study for MWD Hybrid Excitation Generator
Authors: Du Xiao , Li De Sheng , Lin En Huai
Published: March 2013

To obtain the stable output voltage, a new type of MWD hybrid excitation generator is designed in which magnetic flux can be regulated from -2% to 22%. In the generator, hybrid excitation part and permanent magnet part work in parallel. This article introduces the working principle and structure of this generator. In addition, finite element analysis, magnetic field and regulation characteristics analysis for this generator is addressed to illustrate the variation of magnetic flux with pole length and excitation current changing. Experiments verify the design and finite element analyses.
Effects on Error of the Component Power Flow by Mounting Deviation in Pipes
Authors: Liu Yan , Zhu Xian Ming , Peng Wei Cai
Published: March 2013

Amodel between measuring error of component power flow in pipes and mountingdeviation is developed.The proposed model shows that the component power flow is more prone to influenced by positiondeviation, and 5% deviation might result in 10% measuring error. Moreover,contrary to the total power flow, the error of the component power flow is alsorelated to choice of grid origin and amplitude ratio of two component waves.
The Study of Prognostics and Health Management for the Air Cooling Equipments Based on FMA and Life Test
Authors: Ma Hao Dong , Fang Hong Zheng , Cui Shi Meng , Xiong Yi
Published: March 2013

The demands of Prognostics and Health Management (PHM) for the air cooling equipment are constantly growing in the industrial field. However, most studies on PHM of fans are still in the exploratory stage, the failure modes and working conditions are mostly single and ideal. It proposed a PHM method for the brushless DC fan. Firstly it makes an analysis on the failure mode of the air cooling equipment. Secondly, two kinds of the prognostic tests are made, including fault simulation test and accelerated life test. After that, a prognostics method based-on the combination of reliability and data-driven models are proposed. The test results show that the proposed prediction method has a strong practical value.
Evolution of the Coefficient of Dynamic Viscosity with Growing Damage in Metals
Authors: Minhas Zill-e Hasnain , Qin Sun
Published: March 2013

Coefficient of dynamic viscosity (η) for uniaxial rectangular bar of steel is calculated using creep simulation in Ansys. Norton Secondary creep law with coefficients at 600 ᵒC is used. Steel bar is then inflicted with some damage elements in order to investigate the evolution of dynamic viscosity for varying degree of fatigued specimen at constant rate and temperature. Isotropic damage parameter (D) based on the volume fraction of damaged elements is used to formulate a linear relation between the coefficient of viscosity and D. It is found that with 0.001 increase is damage parameter (D), almost 0.6% decrease on the value of Coefficient of dynamic viscosity (η) is observed.
The Finite Element Analysis of Reinforcement Shearing
Authors: Liu Zuo Shi , Chen Xiao Long
Published: March 2013

In order to providing the reference of improving the reliability of the tools, this paper analyze the stress of steel bar cutting tool and reinforcement which is used in the construction equipment in the process of cutting . Finite element method is used to build a 3d model of 60 t hydraulic shearing machine. And stress situation of steel bar and shear blade is analysized in the shearing process. Then inspect if cutting tools is reliable and improving measures are put forward.
Study on the Comprehensive Program of Heat Pump Technology Recycling Thermal Power Plants Circulating Water Heat
Authors: Ma Yun Feng , Liu Yan Xiang , Ji Tao
Published: March 2013

In order to fully recycle power plant’s circulatingwater heat, improve the thermal efficiency and protect the environment, thispaper designs the comprehensive scheme of heat pumptechnology recycling power plant’s circulating water heat, including theboiler mae-up water pre-heating system, the central heating circulatingsystem and the domestic hot water circulating system, which not only run at thesame time but also function independently. Even in non-heating seasons,the waste heat of circulating water can be utilized fully. It is worthmentioning that this paper puts forward to install climate compensationdevice in the central heating system, which can perform intelligent district timesharing control to meet different users’ needs.
Failure Mode and Effects Analysis of Equipment Based on Grey Theory
Authors: Tan Zhen Dong , Du Zun Feng
Published: March 2013

Based on the uncertaintyproblem of decision factors in the fault diagnosis and maintenance ofequipment, the fuzzy method and grey theory were introduced. Firstly, fuzzyterms were applied to describe the basic variables (probability of occurrence,severity and detection). Triangular fuzzy number was selected to carry out thequantitative calculation of fuzzy terms and the defuzzification of membershipfunctions. Then the grey correlations of all Failure modes were computed andrisks were ranked, considering the relative importance of decision factors. Thefuel system of marine diesel engine was taken as an example. It is pointed thatalthough the risk priority numbers are equal, if the values or weights ofdecision factors are different, then the risk levels of Failure modes aredifferent as well. The results indicate that the calculation model can identifythe failures of ship equipment more precisely and optimize allocation ofmaintenance resources.
Experimental Research on Heat Resistances of Vertical Evaportive Condenser
Authors: Wu Zhi Jiang
Published: March 2013

Based on the experiment of vertical evaporative condenser in water vapor condensation, the influence between heat resistances and water spray density, air inlet velocity, spiral inserted tube, wavy tube was studied. The results show the heat resistance at the air-water interface predominates over all other heat resistance, air-water interface heat resistance is particularly declined up to 20.65% with spiral inserted tube, and water condensation heat resistance is particularly declined up to 35.85% with wavy tube.These conclusions are useful for the design, optimization and application of this type of evaporative condenser.
Investigation of Microstructure and Mechanical Properties of Ultra High Strength Bainitic Steel
Authors: Ansari M.H. Sheikh , Aghaie-Khafri M.
Published: March 2013

In this study, medium carbon low alloy steel was used to obtain bainitic structures. The lower bainite and tempered martensite-lower bainite structures were achieved by isothermal austempering and up quenching treatment, respectively. Based on the results obtained these structures showed a very good combination of strength and toughness. Furthermore, it has been shown that austenitization time and temperature, as well as austempering time and temperature play a major role in achieving ultra-high strength bainitic steels.
Hierarchical Structural Model of AC/DC Power Systems
Authors: Zhang Kai Feng , Zhou Hai Ming
Published: March 2013

The hierarchical decomposition and modeling method of large-scale power systems proposed previously is expanded to be suitable for AC/DC power systems in this paper. In the new model of AC/DC systems, DC systems will have the same position as AC systems. The components in AC/DC power systems are classified into three categories, namely conversion components, DC components and AC components. By analyzing the difference between DC interface and AC interface, the unified structural model suitable for any kind of component in AC/DC systems is built. Then, the hierarchical structural model is derived based on the hierarchical decomposition method. The main characteristics of the proposed AC/DC model are the same as that of previous AC model.