bluuebunny/crossref_metadata_2025 huggingface dataset:
Performance Improvement of a HFO Fuelled Medium-Speed Diesel Engine
Authors: Feng Li Yan , Du Bao Guo , Li Jia Xing , Liu Xin
Published: January 2012

This paper presents the endeavor to use Heavy Fuel Oil on a medium-speed diesel engine. The researched engine is a locomotive diesel engine, which used to be only fuelled with light diesel fuel. Since the fuel injection system of the original engine is unfit for HFO, the authors reformed the fuel injection system to meet the requirements of using HFO. In order to decrease the viscosity of the fuel, light diesel fuel was blended with HFO and heating apparatus was applied. A serial of experiments were carried out to check the performance of the reformed engine. Meanwhile, 1-D engine working cycle simulation tool was employed to study the fuel economy and combustion performance of the engine. The results indicate that compared with using light diesel fuel, when using HFO, the engine’s power performance was maintained, and the brake specific fuel consumption was increased. But considering lower price of heavy fuel oil, the fuel economy was greatly improved.
The Standard Deviations for Repeated Eigenvalues of Vibration Control for Structures with Uncertainties
Authors: Wu Xiao Ming , Liu Chun
Published: January 2012

The vibration control problem of repeated eigenvalue systems with random parameters is discussed, which is approximated by a deterministic one. A method for calculating the standard deviations of repeated eigenvalues of the control systems with random parameters is presented by using the random perturbation. It will not require the distribution function of the random parameters of the systems other than their means and variances. The numerical results show that the present method is effective.
Methods to Measure the Transfer Properties of Mortars
Authors: Camarini Gladis , Pereira Valdir Moraes , de Freitas Pedro Murilo Gonçalves , Tirello Regina Andrade
Published: January 2012

The search for techniques and materials able to improve structure quality and durability has lead to research some methods that are able to measure the transfer properties of composites. Cement type has an important influence on mortar performance, and chemical and physical deteriorations modify microstructure, and thereby transfer properties. The aim of this work is to evaluate two methods which can measure the transfer properties of cement based materials: capillary absorption and air permeability tests in mortars produced with blastfurnace slag Portland cement. The relationship between these two methods was investigated. The mortars were submitted to steam curing (60 °C) and standard curing. Results show that steam curing improved initial compressive strength. At 28 days all mortars had the same performance. Water absorption coefficient and air permeability was higher for steam cured mortars. There was a significant correlation between both tests results.
The Transmitter Controller Design of Induced Polarization Instrument
Authors: Wu Ai Ping , Pan He Ping
Published: January 2012

According to the principle of time domain induced polarization, the transmitter controller is designed with Micro Control Unit, the design of hardware and software is described in detail. Time synchronization is realized by GPS, so the accuracy of the system is improved. Simulation and actual test show that the system has characteristics of safety and high stability, it has good prospects.
Influence of Precracked Diffusion Coating of Pt-Modified Aluminide on HCF Fracture Mechanism of IN 792 Nickel-Based Superalloy
Authors: Yuan Kang , Peng Ru Lin , Li Xin Hai , Johansson Sten
Published: January 2012

High-cycle-fatigue (HCF) fracture mechanism of nickel-based superalloy IN 792 coated with Pt-modified aluminide outward-diffusion coating is studied with focus on the influence of coating cracks. It is found that cracking of the diffusion coating prior to HCF tests has little influence on the fatigue limit of specimens with thin coating (50 μm) but lowers the fatigue limit of specimens with thick coating (70 μm). By fractographic analysis, three types of fractural modes are established according to their crack initiations: internal, external and mixed. While external fractural mode is related to the propagation of existing cracks in the coating, internal facture initiates often at Ti-Ta-W-rich carbides and/or topological-close-packed (TCP) phases and grainboundaries in the superalloy. Increasing the thickness of diffusion coating or the amplitude stress promotes the fractural mode transition from internal/mixed to external. The influence of precracking of coatings on the HCF fracture mechanism can be qualitatively explained by its influence on the stress intensity factor.
Design and Implementation of Data Collection and Analysis Based on TWAMP
Authors: Zhang Bin , Zhang Chao , He Bao Hong , Liu Shu
Published: January 2012

To analyze and evaluate IP network, large amounts of raw data measured by different protocol needs to be organized. After the network probes execute protocol issued by RFC, all raw data was stored in distributed network probes. So far system based on TWAMP is hard to find. No more details are described to teach system designers how to collect, store and analyze these data. In this paper two practical mechanisms are introduced. Data collection mechanism mainly focuses on how to effectively store information retrieved from raw TWAMP test packets. Data Analysis mechanism shows how to process raw data and retrieve network metric from these data.
Sorting Mechanism and Airflow Simulation of Garbage Pneumatic Separator
Authors: Li Wei Kang , Yang Shuo , Yang Xin Le
Published: January 2012

In order to obtain flow rule and separation mechanism of garbage mixture particle in pneumatic separator, under the conditions of certain parameters and boundary, gas-solid two-phase flow mathematic model of garbage mixture particle was set up, FLUENT software was used to simulation and analyze the flow field of improved pneumatic separator, the separate track of particle in improved pneumatic separator was gained and performance of improved pneumatic separator was forecasted. Numerical simulation results show that the improved pneumatic separator has stable variation of pressure and velocity field. There not exist internal turbulence and back-mixing phenomenon and three particles with different qualities can be separated effectively. The numerical methods can be further optimized pneumatic separator and important theoretical foundation and technology method are provided for improving the structure and performance of pneumatic separator.
Stationarity of the EEG Segment with Event-Related Potentials
Authors: Fan Gai Ling , Huang Zhi Hua
Published: January 2012

EEG (electroencephalography), as a noninvasive and inexpensive method, is widely used to measure brain function and make inferences about regional brain activity. The stationarity of EEG has been investigated by many researchers, while the stationarity of EEG segment with ERPs (Event-related Potentials) has hardly been concerned about. It is necessary to analyze the stationarity of this kind of EEG. In this paper, we concentrate on the stationarity of the EEG with ERPs by testing the stationarity of 500ms EEG segments with ERPs recorded from six subjects in two types of experiments. The results suggest that selected EEG segment whose length is larger than 190ms remains to be stationarity and all epochs duration less than 40ms is considered to be stationary, whichever channel the data is from and whatever type of cognitive task is performed in the experiment. This is an obvious difference between the stationarity of EEG with ERPs and that of EEG, which is reported to be stationary as long as its length is less than 12s.
Modal Analysis of a New Solid Micro-Gyroscope with Bulk Giant Magnetostrictive Material (GMM) Resonator
Authors: Du Xi Hui , Cui Feng , Wu Xiao Sheng , Liu Wu , Zhang Wei Ping , Chen Wen Yuan
Published: January 2012

Employing unique advantage of giant magnetostrictive strain of giant magnetostrictive material (GMM) for improving reference vibration amplitude, a novel bulk GMM solid MEMS gyroscope, which has small and simple structure and is capable of detecting 2-axis angular rate with improved sensitivity, is proposed. The device structure and operation principle of the gyroscope are presented. Using finite element method (FEM), modal analyses, for whole solid GMM cube and for bulk GMM cube composed of multilayer GMM plates, are conducted. The results show that the fourth order vibration mode for the former and the first order vibration mode with lower frequency of dozens of KHz for the latter were found to meet the working vibratory mode of the gyro sensor. This work of the paper provides theory foundation for structural optimization design and fabrication of the microgyroscope.
The Kinetic Analysis of Carbide Lime Reaction Based on Multi-Heating Rate Method
Authors: Guan Duo Jiao , Xu You Ning , Cai Jiu Ju , Sun Wen Qiang , Zhao Hai
Published: January 2012

In this paper, research was focused on the carbide lime decomposition mechanism in pure N2 atmosphere by using thermo-gravimetric analysis with multi-heating rate method. Appling equal conversion rate method, activity energy E was calculated which was equal to 84.79 kJ/mol without proposing decomposition mechanism. A more accurate and reliable method based on multi-heating rate methods was put forward to deduce the mechanism function of above reaction, which was called “master plot methods”. Comparison was done between the theoretical master plots drawn by assuming various kinetic models and the experimental master plot, which allows us to select the probably appropriate kinetic model of the process under investigation. And the further detailed kinetic analysis was achieved as the knowledge of the kinetic model. The results are as follows: the reaction mechanism function f(α)=2.95(1-α)0.661 or G(α)=1-(1-α)0.339, the pre-exponential factor lnA=15.95. And the decomposition mechanism of carbide lime turned out to be the phase boundary shrinking sphere reaction.
Characteristics Analysis of Photonic Crystal Fiber with Hexagonal and Octagonal Structure
Authors: Wang Wei , Yang Bo , Fan Yue , Song Hong Ru
Published: January 2012

Aiming at the requirements of high performance of optical communication systems, a new type of photonic crystal fiber (PCF) is proposed. This kind of PCF consists of hexagonal air holes in the inner cladding and octagonal air holes in the others layers. Two big elliptical air holes are embedded to enhance the birefringence. Numeral results show that this kind of PCF exhibits high birefringence with the level of 10-3 and high nonlinearity with the level of 10-2m-1w-1. In addition, two zero dispersion points are obtained after optimization, which will find application in dispersion compensation PCFs.
A Reliability Risk Assessment Method Based on Fuzzy FMEA
Authors: Gu Ying Kui , Xiong Yao Gang , Luo Xin Chong
Published: January 2012

A reliability risk assessment model based on fuzzy FMEA was presented by using fuzzy comprehensive evaluation. Fuzzy matrixes were constructed according to the investigation data, in which occurrence probability ranking, effect severity ranking and detection difficulty ranking are all weighted analyzed. A fuzzy hierarchy analysis method was used to obtain the weight of each influence factor. In the model, the potential fault modes and the reasons can be analyzed and the preventive measures can be taken in prevention stage to avoid finding the problems after the products are put into production and market. It will provide new ideas and new methods to improve the operation security of the engine, to prevent and forecast failure, and to estimate and control the risk.
Damage Analysis of High-Speed Axle Press-Fit Part
Authors: Zhao Fang Wei , Xie Ji Long , Xiao Tie Han Yi
Published: January 2012

The relation between the load and the damage on the axle press-fit part is analyzed according to the load on the axle. Abaqus is used to calculate the load-strain transfer coefficient of measured points on the axle press-fit part. The stress spectra are got by load identification. Using GoodMan equation, the equivalent stress spectra on the press-fit part are obtained. According to the equivalent stress spectra, the damage on the axle press-fit part is analyzed.
Surface Measurement Methods Based on Single and Multi-Frequency Fringes and its Applications in Reverse Engineering
Authors: Zhu Yong Jian , Na Jing Xin , Sun Jian Feng , Yin Shao Hui
Published: January 2012

The 3D surface measurement methods are described based on the single and multi-frame fringe projection principles, respectively. The key algorithm  phase reconstructing (PR) is conducted by means of two different concepts; one is the single-frequency spatial phase reconstructing method and the other is the multi-frequency temporal one. On the side of spatial PR, a few typical methods are carried out, among which the most robust one could be achieved. The described spatial methods are implemented under the guide of the suggested modulation gradient variance (MGV) map. Moreover, the network programming (NP) method is also conducted to compare with them. The tested results show that the weighted least square (WLS) is the most robust one among the spatial PR methods. At the same time, the temporal PR method is introduced based on the multi-frequency fringes, and the result proves that it features the better noise immunity and robustness than spatial ones, but needs many different frequencies of fringes that would be more time-consuming. Lastly, the surfaces are reconstructed in reverse engineering (RE) software.
Equilibrium and Thermodynamic Studies on Biosorption of Malachite Green from Aqueous Solution by Fungal Biomass
Authors: Zhang Li Fang
Published: January 2012

The biosorption of Malachite Green from aqueous solution was investigated by using pretreated fungal biomass in a batch system. The effects of initial pH, NaCl concentration, initial dye concentration and temperature on dye biosorption were studied. The results showed that the pretreated fungal biomass exhibited higher dye removal at initial pH value of 5.0-6.0. The bosorption capacity was increased with the increasing temperature in studied temperature range. The Langmuir and Freundlich isotherm models were applied to experimental equilibrium data and the Langmuir model better described the equilibrium dye uptake than the Freundlich model. Thermodynamic studies revealed that the biosorption process was successful, spontaneous and endothermic in nature.
Fabrication of a Novel Catalyst Support with Hierarchical Pore Structure
Authors: Zhang Xue Jun
Published: January 2012

A novel catalyst support with trimodal pore structure was hydrothermally synthesized by building up nano-particles of titanium silicalite-1 inside the macroporous system of silica gel using the tetrapropylammonium hydroxide (TPAOH) as template, titanium (IV) tetrabutoxide monomer (TBOT) as titanium source and the silica gel with macropores as in situ silicon source as well as matrices. The prepared support exhibited intrinsic pore of TS-1, intercrystalline mesopores and residual macropores of silica gel, accomplishing the interconnection of micro-, meso-, and macrpores.
Highly Transparent Y-α-Sialon by Hot Pressing
Authors: Shan Ying Chun , Ye Hui , Xu Jiu Jun , Li Jiang Tao
Published: January 2012

The single-phase Y-α-sialon ceramics with highly optical transmittance were produced by hot pressing starting mixtures of Si3N4, AlN, Al2O3and Y2O3at 1900 °C for 0.5 h in a nitrogen atmosphere. The resultant sialon shows very high optical transparency in the near infrared wavelength region, about 70% for 0.8 mm thickness. In addition to highly transmittance, the Y-α-sialon also show high hardness (19 GPa) and well fracture toughness (4 MPa•m1/2), which attribute to the compound microstructure of uniform, equiaxed grain with a grain size of 2 μm and small aspect ration elongated α-sialon (<2) with a length no more than 5 μm. The high transparent was attribute to the uniform dense microstructure and pure single-phase α-sialon.
Extended Linguistic Variable Based on the Modified Words
Authors: Zhou Sheng Han , Chang Wen Bing
Published: January 2012

This paper aims to expand the concept of linguistic variable. The study analyzes the common conclusion forms in the evaluation project. The evaluation often makes the final conclusion by analyzing the fuzzy number and its membership function. However, the information of modified word or phrase (“largely”, “preliminary” and “unclear”) has got lost in analysis. The study develops the extended linguistic variable by integrating the modified and traditional linguistic variable. It is useful to understand the means of ambiguity exactly in the manufacturing processing.
Solving Large-Scale Heat Exchanger Network Synthesis Problems Using Particle Swarm Optimization
Authors: Huo Zhao Yi , Zhao Liang , Yin Hong Chao
Published: January 2012

Heat exchanger network synthesis has been one of the most popular subjects in process design over the last 50 years. Various studies and optimization techniques have been proposed for designing optimal network with minimum total annual cost. Simultaneous synthesis approach via mathematical programming aims to find the optimal network without decomposition, which has been paid more attentions on the research recently. However, these methods might be not solvable or inefficient for large-scale problems. This paper makes an attempt to construct simultaneous synthesis model with split streams and to develop an efficient optimization framework based on particle swarm optimization for large-scale heat exchanger network synthesis problems. One example including 20 process streams is solved to give an illustration of the method.
Analysis of Surface Defects on Stainless Steel Cold Rolling Strip
Authors: Yan Feng , Liu Chun Li , Yu Ke Qiang
Published: January 2012

In producing stainless steel cold rolling strip, stripe and decorative pattern shape defects occur on the surface, and influence its quality. This paper uses the spot investigation, defects microscopic analysis and scanning electron microscopy spectrometer methods in order to give a detailed analysis about surface defects, discusses the essence of defects, causes and effects process, puts forward valuable suggestions and provides reliable data for the actual production.
The Framework Design of E-Yuan Multimedia System
Authors: Feng Wei Chang , Chen Xiao Meng
Published: January 2012

E-Yuan multimedia system is developed for the rich audio and video resource on the Internet and on its server side, it can automatically search and integration of network video and audio resources, and send to the client side for the user in real-time broadcast TV viewing, full use of remote control operation, Simply it’s a very easy to use multimedia system. This article introduces its infrastructure, main technical ideas and you can also see some details about server side and client side.
Torque Control of Servo Load Simulator with Generalized Dynamic Fuzzy Neural Network Based on Grey Prediction
Authors: Wang Li , Qian Lin Fang , Guo Qi
Published: January 2012

Considering the testing requirements of dynamically loaded about servo system in weapons, a load simulator is presented in this paper and the transfer function of “extraneous torque" is obtained. In order to curb the amplitude of extra torque and achieve dynamic load simulation, this paper proposes a grey prediction-based fuzzy neural network controller, which selects Generalized Dynamic Fuzzy Neural Network as the learning algorithm and selects the ε-completeness as a criterion to determine the width of Gaussian functions. Simulation and experimental results show that the proposed torque controller can significantly reduce the amplitude of the extra torque.
Introduction to Turn-Milling Technology and Application
Authors: Yuan Song Mei , Zhang C. , Huang Y.Z.
Published: January 2012

This paper introduces simply concept and characteristic of turn-milling technology, including turn-milling machining centers and turn-milling process. Detailed describe present situation of turn-milling technology. Brief introduce several application examples of turn-milling technology. Finally, combined with the latest applications of turn-milling technology, discusses development of turn-milling technology, given the 8 direction.
Effect of Liquid-Solid Lubricant on Mixed Lubrication in Line Contact
Authors: Sountaree Rattapasakorn , Jesda Panichakorn , Mongkol Mongkolwongrojn
Published: January 2012

This paper presents the performance characteristics of two surfaces in line contact under isothermal mixed lubrication with non-Newtonian liquid–solid lubricant base on Power law viscosity model. The time dependent Reynolds equation, elastic equation and viscosity equation were formulated for compressible fluid. Newton-Raphson method and multigrid technique were implemented to obtain film thickness profiles, friction coefficient and load carrying in the contact region at various roughness amplitudes, applied loads, speeds and the concentration of solid lubricant. The simulation results showed that roughness amplitude has a significant effect on the film pressure, film thickness and surface contact pressure in the contact region. The film thickness decrease but friction coefficient and asperities load rapidly increases when surface roughness amplitude increases or surface speed decreases. When the concentration of solid lubricant increased, friction coefficient and asperities load decrease but traction and film thickness increase.
Vehicle Routing Problem with Stochastic Demands and Simultaneous Delivery and Pickup
Authors: Wang Chuan Sheng , Qiu Yue
Published: January 2012

In this paper vehicle routing problem with stochastic demands and simultaneous delivery and pickup is developed and analyzed, which is an important expansion of classical Vehicle Routing Problem(VRP).An effective algorithm based on Important Sampling is designed to solve the model. The optimal importance sampling distribution function was obtained by making use of the expection constructed by likelihood ratio. Numerical experiments have been conducted and the results indicate that the method can effectively solve this problem.
A Control Method of Four-Legged Robot Stable Walking with Diagonal Gait
Authors: Fan Chang Hua , Jiang Zhen , He Bai Yu
Published: January 2012

This paper proposes a kind of control method used to solve the stability problem of the trotted robot. Propose the concept of inside flip design four-footed robot and build a double inverted pendulum model. Establish dynamic equation to analyze the factors of affecting the motion stability. During walking, the center of gravity can maintain a proper vibration and have a maximum safety region of flip angle. Finally, use Adams to verify the control method.
Structure and Composition of Supported PtCu-LaOx Composite Multi-Layer Membrane Electrode
Authors: Yang Bin , Xu Tao
Published: January 2012

In order to reduce production cost of Fuel Cells, a new type of Pt/C membrane electrodes -- PtCu-LaOx, LaOx-PtCu and PtCu-LaOx-PtCu composite multi-layer membrane electrodes -- would be raised, in which with developing different membranous layer form dispersed on the surface of carbonaceous or monocrystalline silicon substrates were manufactured by Ion Beam Sputtering technology. Phase composition, micro-area surface topography and elements of these electrodes were analyzed by X-ray Diffraction, Scanning Electron Microscopy combined with Energy Dispersive Spectrometry and Atomic Force Microscope, respectively. It was found that doping La could not only enhance Pt crystallization and decrease Pt grain size but also contribute to Pt(111) preferential orientation growing in the LaOx-PtCu, and that biggish ratio of La(At%) : Pt(At%) in micro-area would be difficult of occurring particles reunion on PtCu-LaOx surface, and that the orientation growing of Pt(200), Pt(220) and Pt(311) would be restrained in PtCu-LaOx and PtCu-LaOx-PtCu, and that the Pt alloy particle exhibited more homogeneous distribution and less size in PtCu-LaOx-PtCu. Our study indicated that these new types of membrane electrodes could be used in Fuel Cells and make Fuel Cells as a new power source for electrical vehicles.
The Study of Fatigue Crack Growth Shape under Mode I Constant Amplitude Loading
Authors: Tu Wen Feng , Gao Zeng Liang , Hu Zhao Ji
Published: January 2012

An experimental study was performed to study crack shape evolution of 16MnR pressure vessel steel by adopted compact tension (CT) specimens under Mode I constant amplitude loading. A data and numerical analysis of crack shape were conducted and the stress intensity factors (SIF) along crack front were calculated. The results revealed that curve crack shape could be described by elliptic equation properly and was similar in the stable crack growth stage. The initial crack shape was straight at the notch root, so SIF of the center was bigger than that of the surface. When the crack shape was curve, SIF of the center was smaller than that of the surface.
Application of Artificial Neural Networks for Prognostic Modeling of Fire Resistance of Reinforced Concrete Pillars
Authors: Lazarevska Marijana , Knezevic Milos , Cvetkovska Meri
Published: January 2012

Artificial neural networks can be used for building prognostic models of various engineering problems. This paper presents an example of how we can predict the time of fire resistance based on the given experimental and numerical results. The analyses concerning the behavior of the reinforced-concrete construction elements during the standard fire, together with the basic theoretical information and detailed problem description, as well as the graphical curves for the fire resistance of the reinforced-concrete pillars, are given in the doctoral theses of Prof. Cvetkovska [3]. Using the concepts of artificial neural networks and the results of the performed numerical analyses as input parameters we made the prediction model for determination of the time of fire resistance of reinforced-concrete pillars. The neural network generated excellent results which will be presented further below in this paper.
Virtual Prototype Modeling and Starting Method of Belt Conveyor
Authors: Du Dong Mei , Li Hong , Zhu Chun Shui , He Qing
Published: January 2012

Large scale belt conveyor is a key device to transport bulk-solid material for long distance. It is necessary to build rational virtual prototype model, analysis dynamic performance of belt conveyor. Comparing with traditional physical prototyping and experimental way, shorter design cycle and lower development costs will be got by using virtual prototype. It is helpful to choose the best design which is rational in technique, safe and reliable in running, feasible in economy. Considered actual working conditions, a virtual prototype model is built and validated by dynamics analysis. Three starting methods including direct starting mode, traditional Harrison method and soft starting are compared. The simulation results of virtual prototype show that direct starting method will lead to higher dynamic tension extreme value and larger fluctuation, dynamic tension is significantly reduced with the traditional Harrison method, and the average dynamic tension of soft starting consider the actual condition is dropped to minimum and the whole system is more stable.
Concept Cartoons Based Two-Tier Online Testing System for Magnetism Conception
Authors: Istanda Vaci , Chang Chun Yang , Lee Wan Chun , Liu Yuan Chen , Wang Sheng Ren
Published: January 2012

This paper aimed at constructing a two-tier on-line testing system. Questions were designed based on integration of concept cartoons and multimedia in hopes that the unexplainable contents of an object can be appropriately represented and interpreted through the means of concept cartoons, and that student’s understanding of the questions and interests in test taking can be effectively enhanced through pictorial presentation of concept cartoons. This system was to construct a testing tool through which tests were conducted to explore third graders’ magnetism misconception. The outcomes indicated that incorporation of concept cartoons in multimedia on-line testing can improve accuracy than traditional written test on paper. During the study, 14 magnetism misconceptions entertained by the pupils were identified and classified. Further, the on-line testing tool can attain satisfactory results in system utilization, animation design, attracting students’ attention and enhancing their understanding of the questions. It demonstrated the fact that integration of concept cartoons with two-tier on-line testing can improve question comprehension and students’ attention.
Experimental Study on Properties of Concrete Mixed with Ferrous Mill Tailing
Authors: Kang Hong Zhen , Jia Kai Wu , Yao Lei
Published: January 2012

In the aim at developing and utilizing ferrous mill tailing resources to save energy, protect environment and develop sustainable society, the research of replacing natural sand for ferrous mill tailing into concrete are carried out. Concrete mixed with ferrous mill tailing is called ferrous mill tailing concrete. The study results show the compressive strength of ferrous mill tailing concrete with grade from C20 to C40 is nearly equal to that of common concrete though its dump and divergence decrease little. Through adding in suitable volumes of water reducing mixture, fly ash and slag powder, its workability is improved and satisfies the practical requirement.
Robust Control Research for AUV Trajectory Control System
Authors: Li Juan , Bian Xin Qian , Xiong Hua Sheng , Wang Hong Jian
Published: January 2012

A robust trajectory control problem for an underactuated AUV with parameter uncertainties and external disturbances was considered. The trajectory control was decomposed in the horizontal plane and vertical plane. Based on the robust theory, the AUV model for heading control was proposed, and the heading controller was designed. The simulated results show that the method can effectively overcome disturbances of constant ocean currents to ensure the precision track.
Effect of Defects on Electrical Property of Multi-Crystalline Silicon
Authors: Tan Yi , Li Ya Qiong , Xu Qiang , Liu Yan Jiao , Hu Gen Xiong , Li Jia Yan
Published: January 2012

Multi-crystalline silicon ingot was prepared by directional solidification method using metallurgical grade silicon as raw materials. The influence of impurities and crystalline defects in mc-Si on the minority carrier lifetime and resistivity was investigated. The results indicate that both grain boundary and impurities play important roles in the deterioration of the minority carrier lifetime.
Design and Optimization of Vertical Axis Wind Turbine
Authors: Cao Yang , Li Xiao Ning , Wu Guo Qing , Chen Xing Hua , Tian Xiao Yan
Published: January 2012

Wind power is a clean and renewable energy, and more and more countries in the world attach great importance to it and promote the development of the wind power industry. The current situation of wind turbines at home and abroad, the development, types, and characteristics were analyzed. The structural design of vertical axis wind turbine (VAWT) and aerodynamic theory of rotor blade were briefly introduced, the characteristic parameters in VAWT design were presented in this paper. Using finite element analysis method, the spindle which is the crucial component of VAWT under the extreme wind load was analyzed, and the corresponding results were obtained. Finally the wall thickness and the structure of spindle were improved and optimized to satisfy the engineering requirements of spindle.
The Design and Research of Switching Power Amplifier Used on Magnetic Suspension Support
Authors: Wang Zhao Yuan , Wu Guo Qing
Published: January 2012

This paper focuses on the switching power amplifier of magnetic suspension support. The principle of magnetic suspension support was described. Due to the particularity that the load of magnetic suspension support is inductive, the response speed, efficiency and stability should be considered when the switching power amplifier is designed. In the power amplifier, PI circuit can make feedback current follow the given signal in time. In this paper, the amplifier adopts pulse width modulation (PWM) control strategy. The design of PI circuit, PWM circuit as well as the driving circuit were presented in the paper. After completing the designs of all parts, we choose MULTISIM as simulation software, which can establish an accurate circuit model. The simulation results show that the switching power amplifier designed in this paper has bigger bandwidth and less distortion and it can respond timely.
A Symbiotic Multi-Species Optimizer for Discrete Optimization
Authors: Huang Ying Hui , Zhang Jian Sheng
Published: January 2012

This paper presents a discrete optimization algorithm based on a model of symbiosis, called binary symbiotic multi-species optimizer (BSMSO). BSMSO extends the dynamics of the canonical binary particle swarm algorithm (CBPSO) by adding a significant ingredient, which takes into account symbiotic co evolution between species. The BSMSO algorithm is evaluated on a number of discrete optimization problems for compared with the CBPSO algorithm. The comparisons show that on average, BSMSO outperforms the BPSOs in terms of accuracy and convergence speed on all benchmark functions.
The Milling Process Monitoring Using 3D Envelope Method
Authors: Bisu Claudiu , Gerard Alain , Zapciu Miron , Cahuc Olivier
Published: January 2012

This paper proposes a method to vibration analysis in order to on-line monitoring of milling process quality. Adapting envelope analysis to characterize the milling tool materials is an important contribution to the qualitative and quantitative characterization of milling capacity and a step by modeling the three-dimensional cutting process. An experimental protocol was designed and developed for the acquisition, processing and analyzing three-dimensional signal. The vibration envelope analysis is proposed to detect the cutting capacity of the tool with the optimization application of cutting parameters. The research is focused on Hilbert transform optimization to evaluate the dynamic behavior of the machine/ tool/workpiece.
Tire Shredding Delamination Peeling Method Research
Authors: Qiu Li Jun , Yang Jia
Published: January 2012

The powder particles were used for different occasions. The steel wire in tire belt layer was to wear the tools in grinding process. Another point was the wire in crushing to go through the magnetic separation. The wire in rubber powder was mixed with the powder in the process of crushing.It increased the mechanical maintenance frequency and the tool used cost. The solution to this problem was tire reasonable decomposition.
Obstacle Detection System Based on Stereo Vision and a Structured Light
Authors: Peng Kai , Zhou Xing Lin , Liu Ji Guang
Published: January 2012

Obstacle detection is a crucial issue for pilotless device guidance function and it has to be performed with high reliability to avoid any potential collision with the front object. The vision-based obstacle detection systems are regarded perfect for this purpose because they require little on all kind of condition. In this paper, an obstacle detection system using stereo vision sensors and structured light is developed. This system realizes rapid feature matching and high precision measurement distance with the help of structured light, avoiding the time-consuming of the initial corresponding pairs. After the initial detection, the system executes the tracking light strip algorithm for the obstacles. The proposed system can detect a front obstacle in vision field and obtain the size of obstacle. The proposed obstacle detection system is set up and its performance is verified experimentally
The Performance Research of Ceramic Fibers Filtration Composite Material
Authors: Gu Ping Dao , Huang Hui , Qiu Ran
Published: January 2012

The filtration performance of composite ceramic filter materials were tested in this paper. which can provide reference for optimizing of ceramic materials sintering process，reducing the filtration resistance and improving the efficiency of the filter，and widely using the composite ceramic filter materials.
Soft-Switching Boost Half-Bridge Converter with High Voltage Gain and Low Input Current Ripple
Authors: Do Hyun Lark
Published: January 2012

A soft-switching boost half-bridge converter with high voltage gain and low input current ripple is proposed in this paper. In the proposed converter, a coupled inductor is used at the boost converter stage to reduce the input current ripple. The half-bridge converter stage provides soft-switching operation and high voltage gain. Also, the reverse-recovery problem of output diodes is significantly alleviated by utilizing the leakage inductance of the transformer. Due to the soft-switching operation of all switching devices, the switching loss is significantly reduced and the high efficiency is obtained. The feasibility and performance of the proposed converter were verified on an experimental prototype
Finite Element Simulation of Crack Testing System of Electromagnetic Acoustic Emission Based on ANSYS
Authors: Zou Qing Yang , Dong Xiu Cheng
Published: January 2012

The finite element method is adopted to simulate the whole process of electromagnetic acoustic emission in this paper. The effects of different voltage on distribution of displacement and temp at the tip of the crack are discussed. The simulation results show that, above voltage loading on the metal plate, the value of the temp around the crack tip can be up to the melting point , which will melt the tip of crack. Larger melting sizes are obtained when loading voltage is increased. At the same case, the displacement duo to electromagnetic force at crack tip is much larger than this induced by thermal expansion
Study on Mechanism of Separate Type Boundary Lubrication in Low Frequency Torsional Vibration Tapping
Authors: Han Feng Qi , Li Zhi Zun , Zhang De Yuan
Published: January 2012

Low frequency torsional vibration tapping is an effective method to solve the problem of tapping in difficult to cut materials. Tapping parameters affect tapping torque and service life of tap, and cutting angle is the key parameter. Experiments were conducted to study the lubrication mechanism and the influence of cutting angle on lubrication effect. Experimental results indicate that the separate type boundary lubrication mode greatly enhances the lubrication effect of cutting fluid and the lubrication effect decreases with the increase of cutting angle. To obtain good technological effect, the smaller cutting angle should be selected.
The Control of Fixed-Bed Reactors for Biomass Pyrolysis: An Overview
Authors: Wu Jun Hui , Wang Jun Kai , Chen Jie , Si Hui Ping , Lin Kai Yan
Published: January 2012

In this paper, a review of the control of fixed-bed reactors for biomass pyrolysis is presented, which is divided into several parts: the mechanism and identification modeling, model reduction methods and system parameter estimation and control methods of fixed-bed reactors etc. Fixed-bed reactors in chemical industry are much similar with those in biomass pyrolysis, so the control methods of fixed-bed reactors in chemical industry can be applied to biomass pyrolysis processes. As a result, some comments are given about control strategies in this field
Research on Coordinated Control System of Unit Considering Regenerator System Based on Bilinear Fit
Authors: Zhu Ze Lei , Han Zhong Xu , Chen Li Jie
Published: January 2012

The validity of mathematical model direct impact the research result of the boiler-turbine coordinated control system. In this paper, applying the mechanical modeling method to set up model of boiler-turbine coordinated control system, and obtain its parameter by parameter identification. The mathematical model of boiler-turbine coordinated system has been modified and supplied by bilinear fit. And, for the practical problems that need to be resolved in research work of the coordination controlled object’s mathematical model, the mathematical analysis was carried out by the regenerator system integrated into heat balance of generator unit and a new type of simulation mathematical model of coordinated control system with regenerator system was researched. The mathematical model was verified through the simulation test. Based on the thought that dynamic energy and static energy separation, the of intelligent controller is structured and applied in coordination control system of generator unit. Simulation results show that not only load response and anti-interference ability are improved, but also dynamic overshoot greatly reduces
Effect Analysis of Different Exhaust Velocity on Fire Smoke Control in Subway Tunnel
Authors: Han Xin , Gao Xiao Ming , Cong Bei Hua
Published: January 2012

Taking a subway tunnel as the research object and based on the CFD simulation method, this paper adopts a large eddy simulation analysis software FDS to simulate and analyze the effect of exhaust velocity on fire smoke control under the condition of the same longitudinal ventilation velocity in subway tunnel. The simulated results can provide some reference to design institutes in the selection of exhaust fan. While the longitudinal ventilation velocity set as 1m/s, the simulation results demonstrate that a quite good smoke control effect could be achieved when the exhaust velocity reaches 5 m/s in the smoke exhaust duct
The Study of Influence Laws of the Part Orientation on the Dimensions of Green Part Base on SLS
Authors: Lu Gang , Yan Qing Song , Xiong Xu , Wan Hong , Zhang Shou Yin , Liu Can Cheng
Published: January 2012

The SLS (Selective Laser Sintering, SLS) technology can directly manufacturing any complex structure, however, due to the limitation of the manufacturing engineering factor, the surface quality and the dimension accuracy of the green part are still an outstanding problem. So, the experimental methods were adopted to study the effect of part orientation on the machining accuracy, the part orientation will significantly affects the outline of the part due to the stair-stepping phenomenon, and then affects the surface quality and the dimension accuracy. The experimental samples of different part orientations including 0, 20, 45, 60, 90 degree were fabricated, and the results indicated that the stair-stepping phenomenon significantly affected by the part orientation, when the part orientation is 0, 45 and 90 degree, the dimension accuracy is best than other part orientation, it mean the stair-stepping phenomenon is smallest. So, when the part structure is complicated, the important structure dimension should be chosen the orientation 0, 45, or 90 degree
Steel Structure Damage Detection Based on BOTDR Based Distributed Fiber Optic Sensors
Authors: Wang Guo An , Zhang Hao
Published: January 2012

For Brillouin Optical Time Domain Reflectometry (BOTDR) based distributed sensing technique, limited by 1m-order spatial resolution, it is difficult to monitor or test localized deformation, and loop installation of optical fiber sensors is a good countermeasure, In this paper, firstly, the measurement behavior and performance of loop installed optical fiber sensors is investigated experimentally, and the accuracy of BOTDR based distributed fiber optic sensors (DFOS) is evaluated. Furthermore, an experimental investigations on a steel specimen is carried out. Based on the investigations, steel structure damage identification method with no requirement for a structural Numerical Model is proposed.
Research on Monitoring Instrument of Environmental Condition
Authors: Niu Jun Hao , Qiu Zhi Jin , Hu Cong
Published: January 2012

A monitoring instrument of environment condition is described in this paper, which uses the LPC2368 as the controller. The acquisition of environmental condition is realized by using SHT11, which is a digital temperature and humidity sensor. A DS1302 is used as the real time reference clock device, and the time message is displayed on the LCD together with the environment temperature and humidity. As if the temperature or humidity is beyond the setting range, the alarm light and sound will be switched on to inform the manager. At the same time, the alarm message could be sent out to other monitor center by RS485 interface. Experimental results show that the temperature and humidity monitor features small, reliable performance, small error, and be suitable to a wide range.
Study on Advanced Oxidation of Cafeteria Wastewater Using Fenton Reagent
Authors: Su Rong Jun , Wang Peng , Jiang Li Ming
Published: January 2012

Fenton reagent was selected as oxidizers for the oxidation and degradation of cafeteria wastewater. The treatment effects were evaluated by the changes of COD and BOD5 parameters. The effects of Fenton reagent ratio, dosage of FeSO4•7H2O and pH value on wastewater treatment under normal temperature and pressure were investigated, the oxidation regularity is initially discovered as well. Orthogonal experiments were designed to optimize the processing conditions based on the single affected factor. The optimized controlling conditions for Fenton reagent treatment process is FeSO4•7H2O=1mmol/L, pH=3, H2O2/Fe2+=3.5:1, reaction time=60min. With Fenton reagent treatment the COD removal ratio was raised up to 94%. Compared with biological process, it saved land occupation and was more suitable for regions which lacked of land space.
A Dynamic Cost Sensitive Support Vector Machine
Authors: Chen Xiao Lin , Jiang Yan , Chen Min Jie , Yu Yong , Nie Hong Ping , Li Min
Published: January 2012

A lot of cost-sensitive support machine vector methods are used to handle the imbalanced datasets, but the obtained results are not as perfect as expectation. A promising method is proposed in this paper, named ADC-SVM, which uses genetic algorithm to dynamically search the optimal misclassification cost to build a cost sensitive support machine. We empirically evaluate ADC-SVM with SVM and Cost-sensitive SVM over 8 realistic imbalanced bi-class datasets from UCI. The experimental results show that ADC-SVM outperforms the other two methods over all the imbalanced datasets.
The Quest into China Engineering Materials Personnel Training Mode
Authors: Qiu Jian Lin
Published: January 2012

With the rapid development of China's economy, construction of the project has made rapid development，and the demand of modern construction materials for projects demanding is higher. High-quality engineering materials technology training is in engineering materials technology development to protect. Based on the analysis of high-quality construction materials and technical personnel on the basis of the basic characteristics, the author summarized the problems in the process of training engineering materials personnel in china and searched into the china engineering materials personnel training mode that includes the university of semi-structured model of teaching and the social talents’ life-long learning
The Relationship between Freeway Safety and Geometric Design Elements
Authors: Guo Yong Qing
Published: January 2012

This paper mainly quantifies the safety effects of ramp spacing, and other geometric design elements of highway facilities. Negative Binomial (NB) regression models have been applied to estimate of different accident types, including total crashes, fatal-plus-injury crashes, single-vehicle crashes and multiple-vehicle crashes. Data for model estimation was collected in 112 freeway segments where each entrance ramp is followed by an exit ramp on I-5 in the Washington State, US. Three years (2005-2007) of freeway crashes has been examined by the NB model. The modeling results have been geared into the development of accident modification factors (AMFs) for ramp spacing that can be used safety prediction of freeways. Furthermore, the results also suggest some geometric designs are recommended to improve freeway safety