bluuebunny/crossref_metadata_2025 huggingface dataset:
The Resistance Simulation of the Y550 Yacht
Authors: Li Shu Jiang , Yang Wei Min , Bai Wen Juan , Wang Yang
Published: December 2012

For the model test and simulation analysis will make combined research,according to the computational fluid dynamics theory based on the ship model test,through to the Y550 yacht do resistance simulation, obtain the Y550 the distribution of flow field in the different pressure and speed,finally obtain the resistance simulation data of the Y550 in static water.
Controlling Edge Effects in Laser Bending
Authors: Shen Hong , Hu Jun
Published: December 2012

Laser forming of sheet metal offers the advantages of requiring no hard tooling, no spring back and no external force. Thus this technology reduces cost, increases flexibility and accuracy. Laser forming is a complicated and transient thermo-mechanical process involving elastic and plastic strain dependent on time history. How to control and enhance the accuracy of the laser forming attracts much attention. This paper put forward a new strategy to control and reduce the edge effects in laser forming. Numerical simulations and experiments were also carried out to validate the presented strategy.
A Chess-Playing Robot Based on SERCOS
Authors: He Ji Lin , Chen Zhi Xian
Published: December 2012

This paper presents a chess-playing robot and its control system based on SERCOS. Thanks to Windows NT operating system and RTX real-time extension, the control system is excellent in real-time property. The whole system, supported by a standard IPC hardware platform and a modularized architecture of system software, is open-ended and expansible. In addition, the chess-playing software makes a contribution to the excellent interaction between players and the chess-playing robot.
Failure Analysis for the Bogie Braking Beam in Working Part of a Tamping Wagon
Authors: Han Shi Chang , Huang Ya Yu , Hu Bin , Hu Bin Xing
Published: December 2012

The failure problem of brakes in the bogie of the working part on a tamper wagon is brought out in this paper. Braking process under its working condition is simulated and the comparison is done between the motion simulation and the working principle of brake system. FEM analysis by ABAQUS is done to analyze the front braking beam which is suffering bigger force. Stress distribution from the FEM analysis is discussed to explain the failure places happen in reality. In the end, an arbitrary crack is assumed and the fatigue life of beam is work out to give a prediction of failure.
Intelligent Air-Conditioning Management System Based on Fuzzy Control
Authors: Li Mao Ren
Published: December 2012

A system combined with Local Operation Network Techniques for control and power management of air conditioning systems to enhance the integration of control information is proposed. Instead of using only one actuator in common control strategy for air conditioning control, we use now multiple actuators and variable speed operated pumps for the heat exchangers. The new system reduces electrical power consumption of the air conditioning pump. The control information exchange system provided by Local Operation Network ensures that only one of the actuators perform the control task within a specific scan time cycle, which is critical for robust fuzzy control.
Operating Performance Study of Ship’s Propulsive Shaft Including Stern Bearing’s Stiffness
Authors: Zhang Sheng Dong , Liu Zheng Lin , Yu Hong Tao
Published: December 2012

In this paper, making ship propulsion shaft as the research object, We do research on characteristics of water-lubricated stern tube bearings and operating performance of ship’s propulsion shaft. Using FEM to discuss the impact law of the geometric properties to water-lubricated rubber bearing stiffness. Combining multiple dynamic and FEM theory, we build propulsion shaft rigid-flexible coupling dynamic model and discuss the influence of stern bearings’ stiffness. Results show that: In a certain scope, water-lubrication stern tube bearing’s stiffness changes in linear rule to the length-diameter ratio, and nonlinear change to radius ratio. Bearings’ stiffness has little influence on reaction force, but has much influence on displacement acceleration.
Research on the Improvement of Inverter Current’s Real Measuring Quality
Authors: Zhang Zhi Bin , Liu Wei , Zhang Shu Yuan
Published: December 2012

In order to improve the inverter current quality，a kind of space vector control method is presented，which has no deadtime and has small torque ripple．The research on improving inverter current quality has been done according to improving electric current harmonic and adopting adaptive filtering technique on the electronic current，and got a better effect on the electronic current real measuring quality
The Research of Button Battery Automatic Production Line Remote Fault Analysis
Authors: Chen Jun , Lin Shu Zhong
Published: December 2012

This article unifies the Li/Mno2button battery automatic production line of production practice, using C/S two-layer system with the B/S three layer architecture combines database system model, mainly expounds the production line in remote fault diagnosis system of fault data analysis and diagnosis method and so on.
A Hysteresis Restoring Force Model of Disc-Shaped Metal Rubber Isolation Component
Authors: Cao Feng Li , Bai Hong Bai , He Zhong Bo , Ren Guo Quan
Published: December 2012

Dynamic load experiments of the disc-shaped metal rubber isolation component are performed. Through analyzing variation law of the parameters with amplitude and frequency, which are stiffness coefficient, damping coefficient and damping component factor, the hysteresis restoring force model which is able to fully reveal the dynamic characteristics of the component is established. The experimental verification results show that the theoretic calculations are consistent with the experimental data, which verifies the practicability and effectiveness of mathematical model and parameter identification. It has important practical significance for design of vibration isolation component with different requirements.
Improved Performance of 4H-SiC MESFET with Stepped-Channel
Authors: Jia Hu Jun , Yang Yin Tang , Zhang Lian Jin , Duan Bao Xing
Published: December 2012

A novel 4H-SiC MESFET with stepped-channel (stepped-spacer) structure is proposed for the first time and analyzed by 2D numerical simulation. Based on the stepped buried oxide structure of SOI which can produce additional electrical Electric field peaks, much more advantages can be obtained through a stepped-channel structure compared to that of the field terminal technology, such as an obvious increase of the breakdown voltage which is equal to the electric field to the path integral, and the lower capacitances lead to a higher cut-off frequency. The simulation results show that a 100% higher saturated drain current and a 153% larger breakdown voltage can be obtained utilizing the stepped-channel structure MESFET than those of the conventional counterpart.
Effect of Heat-Treatment on Wear Performance of Nanolayer WN/TiN Coating
Authors: Yao Shun Hui , Su Yen Liang , Kao W.H.
Published: December 2012

A nanolayer WN/TiN coating was grown using an industrial-scale four-target reactive sputtering system. Effects of heat treatment on fundamental properties and wear performance of the nanolayer coating were studied. For comparison, a single layer TiN was used as a reference. Characterization was carried out using a nano hardness tester, GDOES, XRD and SEM. Wear performance was evaluated using an SRV® wear tester. It was found that the as-deposited nanolayer WN/TiN coating showed relatively high nano hardness and wear resistance as compared with the single layer TiN. The heat treatment resulted in performance degradation of the nanolayer coating. After 600 °C heat-treatment, the nanolayer coating showed very poor mechanical performance.
The Synthesis and Characteristic of PAA-Ch/SiO2 Hydrogel Nanocomposites by Radiation Methods for Bone Materials
Authors: Wu Te Hsing , Lin Hong Ru , Shen Lie Han
Published: December 2012

Generally, hydrogel compounds derived from either natural or synthetic chemical suffer from lack of mechanical strength. So high strength poly(acrylic acid) -chitosan-silica (PAA-Ch-Si) hydrogels were prepared by UV light or γ-ray irradiation method for scaffold material application in this paper. The absorption peaks from FTIR show the evidence for the successful grafting of PAA- Ch-Si hydrogel material through radiation co-polymerization. The mechanical property analysis indicate that the maximum compressive strength of this hydrogel was significantly increased to ~42 MPa when PAA incorporated with both chitosan and nano-silica. And from the test results, we can observe that these nanocomposites are fitted to appling for biomedical materials.
Electric Discharge Grinding of Polycrystalline Diamond Materials
Authors: Ding Song Lin , Mo John P.T. , Brandt Milan , Webb Richard
Published: December 2012

The poor electric conductivity of polycrystalline diamond (PCD) makes it difficult to machine with the conventional EDM process. Inappropriate selection of parameters of the power generator and the servo system leads to unstable working condition and low material removal rate. This paper introduces a method to find optimal parameters in the Electrical Discharge Grinding (EDG) of PCD materials with Taguchi method. The theory and detailed procedures are presented, experimental results are analyzed. The optimized configuration was validated through confirmation tests.
Preparation and Tensile Properties of Gasbag with Textile Reinforced Composite Lining
Authors: Wang Shuai , Jiang Kun , Ning Hui Jun
Published: December 2012

Introducing an gasbag made of novel textile reinforced composite, investigating the tensile properties of this composite through comparison with different directions and speeds tensile test. The research indicates that this composite has preferable tensile properties, and the tensile properties are the same between transverse and longitudinal direction. The tensile fracture is brittle fracture. This result supplies necessary base for application of this new type textile reinforced composite.
Preparation of Different Morphology TNT Film Electrodes and its Photocatalytic Degradation of Alachlor in Aqueous Solution
Authors: Wang Chun Li , Zhong Yao , Xin Yan Jun
Published: December 2012

Titanium dioxide(TiO2) nanotube film electrodes were fabricated by an anodic oxidation process at different preparing conditions. The morphology and structure of the TNT film electrodes were examined by scanning electron microscopy (SEM) and X-ray diffraction (XRD). Photocatalytic activity of the TNT film electeodes was evaluated by the degradation of alachlor in aqueous solution under visible light irradiation. Results indicated TNT film electrode anodized at 20V had well-aligned and highly ordered nanotube arrays and possessed relatively higher photocatalytic activity. In addition, the TNT film electrodes calcined at 500°C for 2 h with the higher degree of crystallinity exhibited the higher photocatalytic activity than other samples calcined at 300°C and 800°C.
Study of TiN Film Adhesion Strength by Pulsed-Laser Shock Detection Method
Authors: Yu Bin Bin , Yuan Jun Tang
Published: December 2012

Bonding strength of the interface of film-substratum is an important factor and key problem that influence the reliability and usage of film-substratum system. The new technology of pulsed-laser shock detection method which analyzes the mechanism and mathematical model of film separation under the action of pulsed-laser shock,. With the example of measuring the adhesion strength of TiN/SKD11 film system, the surface was respectively impacted with pulsed-laser at the range of 650~1000mJ. To observe the surface topography of Impact points by scanning electron microscope, and to identify TiN film failure threshold by the reflected signal detection. By analyzing the experimental result, it was suggested that film/substrate interfacial adhesion strength was 4.954GW/cm2.
Analysis of Service-Oriented Manufacturing Network Based on Complex Network
Authors: Li Ji , Mo Rong , Liu Ling Ling
Published: December 2012

Aiming at the description and analysis of service-oriented manufacturing network, the paper gives its definition on the basis of analyzing the relationship between enterprises and service. Besides, it not only defines, calculates and analyzes the statistic characteristics such as node strength and clustering coefficient by the complex weighted theory, but reveals the status of enterprise and correlations in the manufacturing environment of oriented service. This study can not only provide basis for the construction and management of service-oriented manufacturing network, but for search and grouping of collaborative partners.
Configuration of Product Satisfaction Index Weights Based on SEM
Authors: Ge Chang , Yu Sui Huai , Ji Xiao Min , Xiong Da Qing
Published: December 2012

In the process of product satisfaction solution by SEM (Structural Equation Modeling), the model of product satisfaction has been revised aiming at solving the weights of satisfaction index distribution in the multi-sample situation. According to the characteristic of satisfaction data sampling, the partial least square is introduced, and the algorithmic method of satisfaction weights based on SEM is presented. The proposed method has been validated by an example of digital photo frame.
Isothermal Crystallization of Polyethylene/Montmorillonite Nanocomposites Prepared by In Situ Polymerization
Authors: Li Min , Xiao Li Guang , Zhao Hong Kai
Published: December 2012

Polyethylene/montmorillonite (PE/MMT) nanocomposites were prepared by in situ polymerization. The isothermal crystallization of PE/MMT nanocomposites at different MMT concentration (from 0.1 wt % to 1.2 wt %) was investigated by differential scanning calorimetry (DSC). The crystallization kinetics shows that the Avrami exponent of PE/MMT nanocomposites is decreased compared with pure PE, which indicates a decrease in the crystal growth dimension. This is attributed to the stems of PE crystals confined in the MMT layers. The crystallization rates of PE/MMT nanocomposites are faster than those of pure PE. However, when the content of MMT increases from 0.1 wt % to 1.2 wt %, the crystallization rate of PE/MMT nanocomposites is decreased.
Modeling of Resources Capability for Manufacturing Equipments in Cloud Manufacturing
Authors: Zhao Yuan Yuan , Liu Quan , Xu Wen Jun , Gao Lu
Published: December 2012

Being a kind of actual resources, manufacturing equipment resources (MERs) need to be virtualized and encapsulated into services. Our proposed works mainly focus on manufacturing capability of MERs that is consisted of two aspects: static functional capability and dynamic production capability, and relationship between related concepts so as to model MERs by ontology web language (OWL) that is based on semantic. In this paper, firstly, ontology based methodology within manufacture field is developed according to cloud manufacturing characters. Secondly, manufacturing capability is studied from functional attribute capability and production capability, then, the related concepts classes and relationship are analyzed, with the special properties defined to describe these classes based on semantic. Thirdly, the built in model is described by OWL (ontology web language) using protégé tool and an instance of MER is built based on the proposed model to express its manufacturing capability. Finally, this model is applied to Cloud MERs service platform, which is constructed for a given enterprise group, to provide MERs services. Moreover, Web Service is used in the platform to realize the sharing of the provided services.
Reliability Evaluation of Chain-Type Tool Magazine and ATC
Authors: Lu Xiao Hong , Han Peng Zhuo , Wu Wen Yi
Published: December 2012

As the tool magazine and automatic tool changer (ATC) are the important function units to reserve and change tools for the machining center, the tool-changing rate affects their reliability life which directly influences the performance level of the machining center. However, the reliability of the tool magazine and ATC has not yet got a reasonable evaluation index. Directing at the features of the tool magazine and ATC system, the mean tool change numbers between failures evaluation index is proposed, which is used to calculate the mean time to repair and estimate the collected failure data of the chain-type tool magazine and ATC. It can be seen that the tool magazine with continuous tool-changing adopts the mean tool change numbers between failures as the reliability evaluation index.
Research on NC Electrochemical Mechanical Drilling
Authors: Gan Wei Min , Xu Bo , Zhao Zhi Fang
Published: December 2012

NC electrochemical mechanical drilling was based on NC, Electrochemical machining and mechanical grinding. It drilled with different diameter composite cathodes. This kind of drilling method took the advantages of electrochemical mechanical, so it was not restricted by parts’ strength, hardness and stiffness. The cover of cathode ensured the drilling precision. So this technology should be studied. This paper took 304 stainless steel and high temperature alloy GH710 to do study, at last the reasonable and high efficient process parameters were found in the experiment. The high quality holes of better roundness and small taper angle were drilled. The results showed that the study of NC electrochemical mechanical drilling difficult-to-machine materials was very meaningful.
Research on Overall Framework of Deyang Manufacturing Information Platform Based on Production Service
Authors: Yu Si Tu , Li Deng Wan , Zhen Xiang , Xu Ming Heng , Gao Hong Li
Published: December 2012

Aimed at specialty of Deyang Heavy Equipment Manufacturing Base (DHEMB), which is formed by numerous medium-sized and small enterprises leading by three huge factories, an overall framework of manufacture information platform is put forward based on production service. The soft and hardware structure and the function modules of the platform are analyzed, and the operation mode of network information platform is studied as well. These can be good foundation for the platform development and carrying out.
Luminescence Properties of Inert Lanthanide Ion Doped Europium Complexes with 2-Pyrazinecarboxylic Acid and Butanedioic Acid
Authors: Zhao Ming Yan , Ma Rui Jun , Chen Ying Nan , Zhang Hai Xia , Kong Kai , Chu Hai Bin , Zhao Feng Ying , Zhao Yong Liang
Published: December 2012

Nine europium complexes with 2-pyrazinecarboxylic acid (Hpyca) and butanedioic acid (HBDA) were synthesized and characterized by elemental, IR, EDTA titration, ICP, and TG-DSC analyses. The results show that the complexes have the compositions of Eu(Pyca)(BDA)•2H2O, Eu0.7La0.3(Pyca)(BDA)•2H2O, Eu0.6La0.4(pyca)(BDA)•3H2O, Eu0.5La0.5(pyca)(BDA)•4H2O, Eu0.7Y0.3(Pyca)(BDA)•3H2O, Eu0.6Y0.4 (Pyca)(BDA)•2H2O, Eu0.5Y0.5(Pyca)(BDA)•3H2O, Eu0.7Gd0.3(Pyca)(BDA)•2H2O and Eu0.5Gd0.5(Pyca)(BDA)•2H2O. IR spectra indicate that lanthanide ions coordinate with the carboxylic oxygen atoms and nitrogen atoms of Hpyca and oxygen atoms of HBDA. Luminescence spectra show that the introduction of La3+, Y3+ or Gd3+ in the complexes does not change the luminescence peak position, but remarkably increases luminescent intensity of the europium complexes. The quantum yields of the complexes doped with inert lanthanide ions (La3+, Y3+ or Gd3+) are higher than that of the undoped europium complex. Furthermore, doping the inert lanthanide ions in right proportion can increase the luminescence lifetimes of complexes. Those complexes are of strong luminescence, low cost and practical value.
The System Software for Automatic Jam Detection and Recovery on Manufacturing System
Authors: Jeong Hwa Young , Hong Bong Hwa
Published: December 2012

In manufacturing system, around the year 1950’s, computer aided design (CAD) and developments of NC resulted which led to the evolution of systems like computer numerical control (CNC) and direct numerical control (DNC). Today, computer integrated manufacturing is a reality. The advent of computer integrated manufacturing system has got an efficiency and high performance for production. And manufacturing system operating ratio was related by cost-efficiency of the factory operation and increasing good production. However it has still problem that the system engineer who is in the factory hard to keep watching the manufacturing system always in order to recover the manufacturing system when it has system error. In this paper, we propose system jam detection and recovery process for manufacturing system. For this process, we make and use system Jam Database and Jam Recovery Process Sequence.
Honeycomb Multistage Control of Hydraulic Loading Testing Machine
Authors: Lv Jun
Published: December 2012

Static and dynamic characteristics of the honeycomb paperboard with different size and structure are mechanics research priorities. Study on its mechanical characteristics of the basic way is the basic mechanical properties testing by loading testing machine. In order to get the stability of compressive strength of honeycomb paperboard, compressive strength of honeycomb paperboard models should be tested. Based on the existing equipment, new equipment has been made with new hydraulic systems and control programmes, control accuracy and method has been analyzed. Experimental testing results have shown that the device is credible, and its precision meets to the design requirements. The honeycomb paperboard testing machine not only provides a high pressure range and flexible control equipment, but provides a function of testing sample size effects.
Study on High Dynamic Variable Speed Hydraulic Control System
Authors: Shen Hai Kuo , Nie Meng , Zhi Shao Dan , Bo Jin
Published: December 2012

A new type of high dynamic variable speed hydraulic control system is developed in this paper. In this system, a fixed displacement hydraulic pump is driven by an electrical motor which is controlled by a frequency inverter, so the discharge of the pump can be modified by changing the speed of the motor. A proportional directional valve is used to acquire higher low-speed control precision and faster dynamic response while the system is decelerating. In order to improve the dynamic response while the system is accelerating, an energy regulation device is employed in the system. The digital simulation results show that this system has higher efficiency than valve control system. Further more it has faster dynamic response and higher low-speed control precision than normal variable speed hydraulic control system.
The Research of Gas Flow Model in the Condition of Active Manometry
Authors: Cheng Gen Yin , Qi Li Ming , Cheng You
Published: December 2012

Gas flow is a complicated process in the condition of active manometry, we can build a gas flow model on the base of coal seam gas flow theory and math calculation. Through this gas flow model, we can get the traits of gas flow in coal seam around borehole.
Characteristic and its Development Tendency of Virtual Product Development Technology
Authors: Suo Xin Yu , Hu Rui Bo , Xu Ren Ping
Published: December 2012

The concept and characteristic of virtual product development technology are introduced,and the four stages of starting stage,development stage, prosperous stage and future development stage show that virtual product development technology uses computer complete the whole process of product development ,and is a reappearance in virtual environment of real process of design and manufacture of product, a integration of virtual computer technology combined with modern designing method ,which explain that Pro/E MasterCAM can realize the value of product virtual developmen.Its advantages are also analyzed ,as well as its development tendency
A Single-Chip Design for the Three-Phase BDCM System
Authors: Chen Shen Li , Lee C.K.
Published: December 2012

In this work, we present a sensorless single-chip design for the three-phase brushless DC motors (BDCM) system, and which is implemented by a 0.35um CMOS process. A mixed-signal IC will be accomplished by the implementation of analog circuit and digital circuit in the same chip. Eventually, this chip system includes an analog circuit (Hall signal amplifier), a digital circuit (logic process block), and a frequency voltage converter (FVC) to complete the control & driving circuits. Experimental results are included to verify the proposed scheme.
Based on Pro/E and Ansys'Finite Element Analysis of Conveying Roller
Authors: Chen Chan Juan , Wen Zhou
Published: December 2012

In order to study conveying roller force and improve its mechanical properties, we use three-dimensional modeling software Pro/E to build the solid model of the Apple box delivery device’s conveying roller. Using finite element analysis software Ansys to analyze conveying roller’s bending stress, we can get images of local strain and displacement contours .Contrasting with factory’s broken roller conveyor, we can find that: through the establishment of appropriate boundary conditions, Ansys can accurate finite element analysis, and provide the basis for the conveying roller structure improvements.
Constructing of Multiple-Element Systems with V Order
Authors: Li Xiao Yi , Xu Zhao Di , Chou Wan Xi
Published: December 2012

This paper gives the definitions of exported design and residual design is given. The relation of order between derived design and residual design has been clarified. The blocks capacity in derived design are and the blocks capacity in residual design are . The number of non-isomorphism derived design is equal to the residual design. If the incidience matrix of derived design is , then the incidience matrix of residual design is . The blocks in derived design and the blocks in residual design exist the complementary relationship. The construction methods of derived design and residual design have been proposed. The entire procedure of constructing (15,7,3) derived design and (15,8,2) residual design is also presented completely.
Design of an Electromechanical Coordination Vibration Suppression Method for VAWT Main Spindle
Authors: Wu Ai Hua , Mao Jing Feng , Wu Guo Qing , Zhang Xu Dong , Cao Yang , Shao Bo
Published: December 2012

Because of its advantageous aerodynamic performance, the vertical-axis wind turbine (VAWT) has gained more and more attention. This paper studies the vibration characteristic of the VAWT main spindle, and presents a mechanical and electromechanical coordination vibration suppression method for the VAWT main spindle. The proposed method can measure main spindle current vibration intensity in real-time. And when the main spindle vibration intensity exceeds preset critical control threshold value, the method can use both the on-line intelligent analysis decision and the mechanical and electromechanical coordinated controller to suppress the main spindle vibration, as well as to make the VAWT maintain mechanical stability. At the same time, the method can ensure the VAWT meets maximum wind energy capture efficiency as far as possible.
Design of the Eddy Current Sensor of Steel Ball Nondestructive Detection
Authors: Xie Feng Qin , Xiao Lin Jing , Lu Ya Peng , Zhang Hua Yu
Published: December 2012

The ball surface and sub-surface defects can be test by the eddy current nondestructive method. The core part of the eddy current system is the sensor’s design, including the coil and the process of induction signals. At the end, through experiment of detecting a set of defect ball, with a better result. It’s shows that the amplitude of the detection signal is proportional to the depth of the steel balls crack.
Development of Flexible Rolling Device for 3D Plate
Authors: Li Ren Jun , Li Ming Zhe , Qiu Ning Jia
Published: December 2012

To effectively form three-dimensional sheet metal parts with various curvatures produced in small quantities, flexible rolling forming, a new flexible forming method is being developed. Firstly, concept of the flexible rolling forming is introduced and its characteristics and working principle are analyzed by the combination of conventional rolling and multi-point forming. Secondly, the equipment design scheme of flexible rolling forming is put forward and the relevant device is developed. Thirdly, the feasibility and practicality of flexible rolling forming are verified by rolling several typical three-dimensional surface parts such as spherical and saddle surface parts by self-developed device. Finally, verifies the reasonableness of the device and at the same time possesses the important guiding significance to the research and development of practical flexible rolling forming equipment.
Differential Drive Servo Valve Based on MSMA
Authors: Yu Chao , Chen Kui Sheng , Fu Shu Guang
Published: December 2012

Aimed at the contradiction between high frequency response and large flow of servo valve, the paper puts forward a 2D servo valve with differential drive based on magnetic controlled shape memory alloy(MSMA). To realize large flow control, the valve-spool is set of flow increasing orifice to match the flow increasing window on the valve-sleeve. The paper briefly introduces the structural features of the 2D servo valve and the working principle of the differential drive. It also has a simulation analysis on the magnetic field of the drive and the low field of the valve. Simulation results show that, the flow of the valve is linear with the input current.
Optimization of Supersonic Plasma Spraying Parameters Based on Coating Porosity
Authors: Liu Ming , Wang Hai Jun , Jiang Yi , Guo Yong Ming , Song Ya Nan
Published: December 2012

In this paper, an optimization experiment was designed to get the optimal performance of supersonic sprayed coating. Response surface methodology based on Box-Behnken design has been used in this experimental design. Input factors were designed with four representative spraying parameters: powder feed rate, spraying power, argon flow rate and hydrogen flow rate. Porosity of NiCrBSi coating, as the only measured response, was applied to estimate the influence of spraying process on the coating performance. Results indicate that porosity is the most sensitive to change powder feed rate, followed by argon flow rate, hydrogen flow rate and spraying power. A minimum porosity of 1.8% was obtained under the optimization spraying parameters.
Energy Density Prediction of Random Structures Using Perturbation Method
Authors: Wang Kun , Zhao Yang
Published: December 2012

To predict energy density response of random structures using EFEM, a perturbation method was introduced into governing equations of energy density for one- and two-dimensional structures. Two equation sets governing the energy density response of random structures were obtained. Simulations were carried for a plate with random damping ratio and the energy density response was obtained. It can be seen that EFEM provides space- and frequency-averaged response. Comparing with probabilistic method, the governing equation sets provide the same mean response and a smaller response range. The perturbation method using in EFEM turns out an effective method with less uncertainty and a promising method for response prediction for random structures.
Equivalence Study for Special Purpose Vehicle Durability Test on Different Program Ground
Authors: Wang Guo Jun , Chen Xin , Zhu Yan , Xu An Tao
Published: December 2012

The number of special purpose vehicle increase quickly recent year, so more Program Grounds were needed to performed the durability test. Now more than one Program Ground owned the qualification to perform the test. To secure the test results were uniform in different Program Grounds, a equivalence analysis method based on fatigue theory was given in the paper. The acceleration signals on vehicle were taken as the basic parameters in the method. At last, a high mobility vehicle was used to collecting the vibration signals on two different Program Grounds.The equivalence relationship was analyzed.
Evolutionary Cellular Automata Algorithm with Hybrid Discrete Variables and its Application to Mechanical Optimization
Authors: Xiao Wei Yue , Cai Yue Hua , Luo You Xin
Published: December 2012

The optimization design about hybrid discrete variables synthesizing integer, discrete and continuous variables is very significant but also difficult in engineering, mathematics for programming and operational research. Aimed at shortages of existing optimum methods, in this paper, Evolutionary Cellar Automata Algorithm (ECAA) is proposed to complex optimization problem with hybrid discrete variables which has a digging operator and two learning operators (dual arithmetic crossover operator and chaos-peak-jumping operator). The computing examples of mechanical optimization design show that this algorithm has no special requirements on the characteristics of optimal designing problems, it has a fairly good universal adaptability and a reliable operation of program with a strong ability of overall convergence and high efficiency.
Effect of Intercritical Annealing Temperature on Formability and Bake-Hardening-Index of High Strength Steel for Exposed Auto Body
Authors: Fang Fang , Sun Fang Yi , Wang Li Xin
Published: December 2012

The theoretical prediction of main strengthening elements, final hot rolling， coiling and intercritical annealing soaking temperature were conducted by thermodynamic calculations, which agreed with the experimental results. The good formability and bake-hardening-index property gained from the experimental procedure according to the calculations show that, n (tensile strain hardenability value), r (plastic strain ratio) and BH2 (bake-hardening-index) represent maximum value when soaking temperatures were set from 800 to 820°C, the maximum value of n is 0.21, r is 1.39, BH2 is 44 MPa.
Fully Nonparametric Regression Estimation Based on Empirical Mode Decomposition
Authors: Hu Hong Ying , Li Wen Long , Zhao Feng Qiang
Published: December 2012

Empirical Mode Decomposition (EMD) is a non-stationary signal processing method developed recently. It has been applied in many engineering fields. EMD has many similarities with wavelet decomposition. But EMD Decomposition has its own characteristics, especially in accurate trend extracting. Therefore the paper firstly proposes an algorithm of extracting slow-varying trend based on EMD. Then, according to wavelet regression estimation method, a new regression function estimation method based on EMD is presented. The simulation proves the advantages of the approach with easy computation and more accurate result.
Influencing Factors on Stick-Slip Behavior of a Ball Screw Driven Elevation Mechanism for MLRS
Authors: Choi Young Hyu , Jang Sung Hyun , Oh Ji Han
Published: December 2012

As an MLRS (Multiple Launch Rocket System) cage is moved with a uniform speed through an elevation mechanism for MRLS operated using ball screws, its stick-slip behavior can be observed by the friction in a ball screw actuator. In this study, a single-degree of freedom mathematical model of an MLRS elevation system is designed and its stick-slip behavior is analyzed using a friction force model considering the Stribeck effect. The stability of a vibration system is analyzed through deriving an equation of normalized motion for the mathematical model and the influences of mechanical parameters and friction parameters on the vibration response and stability are theoretically analyzed.
Integration of Conceptual Design and MOKA into CATIA v5: A Knowledge-Based Application for an Aircraft Y-Bolt Component
Authors: Zheng Pai , Torres Víctor Hugo , Ríos José , Zhao Gang
Published: December 2012

The design process comprises the Conceptual Phase, the Embodiment Phase and the Detail Design Phase in which commercial PLM/CAD systems mainly support the latter ones. This situation causes the discontinuity in the overall design information flow: Customer Needs (CNs) - Functional Requirements (FRs) – Design Parameters (DPs) – Key Characteristics (KCs) – Geometric Parameters (GPs). There is also a lack of knowledge reuse in routine design process, resulting in large cost-waste of the overall design process. Aiming to enhance the continuity of the design information flow and facilitate the knowledge reuse, this paper makes use of a knowledge-based framework to integrate conceptual design tools: Quality Function Deployment (QFD), Axiomatic Design (AD), Failure Mode and Effects Analysis (FMEA) and the MOKA methodology into CATIA v5 system. A knowledge-based application (KBA) on the large aircraft y-bolt component design is presented as a case study to validate the proposed framework. The result shows how this novel integrated framework and KBA system could benefit designers in a practical way.
Preparation and Corrosion Behaviour of Micro-Arc Oxidation Coating on Ti6Al4V Alloy
Authors: Lin Xiu Zhou , Gong Min , Wang Zhao Hua , Zhang Peng
Published: December 2012

Micro-arc oxidation (MAO) coatings were prepared on Ti6Al4V alloys surface by using self-made micro-arc oxidation equipment. Its characterizations were systematically detected by Vickers hardness tester, scanning electron microscope (SEM), X-ray diffractometer (XRD) and X-ray fluorescence spectrometer (XFS). Corrosion behaviour of MAO coating and Ti6Al4V alloy in Hank's simulated body fluid were studied comparatively using electrochemical workstations and salt spray test chamber. The experimental results indicated that the MAO coating, with rough surface, high hardness and typical porous ceramic structure, is mainly consist of anatase and rutile TiO2 phase. Micro-arc oxidation treatment can significantly improve corrosion resistance of Ti6Al4 alloy, and the corrosion resistance of the coating is observably affected by the coating technology. During the micro-arc oxidation treatment, the thickness of the coating increases with the increase of oxidation time, which induce that the corrosion potential and polarization resistance of the coating increase, and the corrosion current reduce. Simultaneously, the thicker the coating, the higher the pitting resistance is. On the other hand, under the same oxidation time, as the current density increases during micro-arc oxidation treatment, the corrosion potential of the coating positive shifts, and the corrosion current reduces.
Research on the Control of ZnO Nanostructures Morphology via a Reverse Micellar Route
Authors: Li Rui , Wang Yan Tao
Published: December 2012

ZnO nanostructures with controllable morphology were synthesized by confining the reaction of Zn(NO3)2 and MEA in Reverse Micellar system composed with CCl4-AOT-Water. It was found that the ratio of MEA/ Zn(NO3)2 is decisive on the morphology of ZnO nanostructures. As the lower ratio of MEA/ Zn(NO3)2 is lower than 2:1, ZnO nanodots with a size about 5 nm were generated; the increase in the ratio of MEA/ Zn(NO3)2 leads to the formation of ZnO nanorods.
Control on the Photoluminescence of ZnO Nanostructures Synthesized by a Reverse Micellar Route
Authors: Wang Yan Tao , Li Rui
Published: December 2012

ZnO nanostructures with controlable properties were synthesized by a reverse micellar system. The morphology and photoluminescence of ZnO nanostructures can be controlled by changing the the ratio of reaction Zn(NO3)2 and MEA. As the ratio of MEA/ Zn(NO3)2 is low, ZnO nanodots were generated with strong blue emission; as the ratio of MEA/ Zn(NO3)2 is increased, the formation of ZnO nanorods with green emission were synthesized. Since the photoluminescence (PL) properties could be adjusted by varying the nanostructures, these ZnO materials have high potential on different applications, for instance, as fluorescence probes.
High Thermoelectric Performance of p-Type Bi0.5Sb1.5Te3+xTe Crystals Prepared via Gradient Freezing
Authors: Liang Tao Hua , Yang Shi Qing , Chen Zhi , Yang Qing Xue
Published: December 2012

p-type Bi0.5Sb1.5Te3+xTe thermoelectric crystals with various percentages of Te (x = 0.00 wt.%–3.00 wt.%) excess were prepared by the gradient freeze method. By doping with different Te contents, anti-site defects, Te vacancies and hole carrier concentrations were controlled. The Seebeck coefficient, resistivity, thermal conductivity, carrier concentration, and mobility were measured. The relationships between the Te content and thermoelectric properties were investigated in detail. The results suggested that the thermoelectric figure of merit ZT of the Bi0.5Sb1.5Te3+0.09wt.% crystals was 1.36 near room temperature, the optimum carrier concentration was 1.25 × 1019 cm-3, and the mobility was 1480 cm2 V-1 S-1, respectively.
Surface Micro-Structure Effect the Combustion and Mechanical Properties of Triple Base Propellants
Authors: Zhang Fu Yang , Du Ping , Liao Xin
Published: December 2012

In order to obtain surface micro-holes structure of triple-base propellants, using hot water erosion triple base propellant. Control the immerse time interval, forming different surface micro-structure samples, the combustion performance was studied through closed-bomb test and the anti-tensile intensity was measured by material testing machine. Experimental results indicate that, surface micro-structure can form by immersed in hot water, the surface micro-structure decreased combustion time of propellant, on the other hand, decreased the anti-tensile intensity of propellants.
Study on Cutting Process of Manual Thermite Cutting Technology
Authors: Wang Sen , Xin Wen Tong , Qu Li Feng , Wu Yi Ying
Published: December 2012

Through research of stiletto and analysis of cutting process of manual thermite cutting technology, mechanism and chemical compositions of cutting ammunition is expounded. This type of cutting ammunition was only operated in terms of some cutting technology, including cut method, cutting technique parameter, cutting operate. The chemical composition of the cutting ammunition is the key to the final incision quality. The powders include thermite, gas-making agents and alloying addition. KNO3 is up to 4.8% to 10.5% in the cutting medicament and CuO+Al is up to 13.6% to 22.8% in the thermite to cut steel of Q235 which is 263mm ×165mm × 20mm on the basis of the eject times of case primer, depth of the hole, diameter of the hole and the taper .
The Stress Change Simulation Analysis for Beam Blank Cogging during H-Beam Rolling
Authors: Chen Lin , Li Ze Yuan , Bi Ke Xin
Published: December 2012

In order to guarantee the requirements of H-beam microstructure and property, its must have a certain compression ratio in the rolling process from blank to finished products. This paper simulated and analyzed the law of H-beam equivalent stress change for beam blank cogging with software DEFORM. Simulation results show that the compression ratio is 10.78 in the rolling process from blank to finished products; after BD cogging, blank size meet the requirements of A hole by rolling one pass into CCS rolling, the law of H-beam equivalent stress mainly focus on the waist and haunch joint in the whole process of beam blank cogging.
Multi-Fields Coupled Simulation on Casting Process of Aluminum Alloy Based on Heat Conduction by Rotating Heat Pipe Bundle
Authors: Chen Jian Mei , Li Yu Qiang , E Jia Qiang
Published: December 2012

Based on the knowledge to defects and advantages of traditional ingot casting, a new approach for casting of aluminum alloy ingot, based on heat conduction by rotating heat pipes, is put forward in this paper. Different from the conventional casting method that cooling around ingot, the microstructure and properties of casting ingots can be significantly improved due to cooling of molten liquid from the central by rotating heat pipes proposed by this paper. Through simulation on the working process and the fields of flow and temperature, it can be speculatively seen that the ingot solidification is from inside to outside and that inner stress inside the ingot is compressive. The influences of speed of heat pipe bundle, casting speed and casting temperature on the temperature field in the ingot have been systematically studied. The ingots with different sizes can be prepared by changing size and structure layout of the heat pipes.
Experimentation and Research of Three-Phase Switching Synchronous Operation of Novel High Speed Switch Gear
Authors: Dong En Yuan , Zhao Jin Hu , Bi Ying Hua , Wang Yong Xing , Duan Xiong Ying
Published: December 2012

This paper has proposed a novel high speed switch gear (NHSSG) whose contacts could detach quickly; it exploits the principle of the repulsion force generated by eddy effect. The NHSSG is mainly used in the hybrid switch gear (HSG) to cut off the fault circuit cooperate with the solid state thyristor switch gear (SSTSG) in a short time, so it is important for the NHSSG to motion at a certain time. Consequently, a lot of experiments have been done in different aspects to find out the impact extent of the six factors to the actuation time of the NHSSG, and the three-phase switching synchronous operation (TPSSO) experiments have been done based on the result of the analysis, and the accurate three-phase switching synchronous operation was obtained at last.
Optimization of the Submerged Fermentation Conditions of Ganoderma Lucidum with High Triterpenoids Production by Response Surface Analysis
Authors: Cui Mei Lin , He Guo Qing
Published: December 2012

In this paper, yeast extract concentration, incubation days and inoculation was made as independent variables, the production of intracellular triterpenoids, intracellular polysaccharides and mycelia biomass were made as response values, we set up central composite design of three factors and three levels. Through the analysis of the regression model, we could see that when yeast extract concentration was 1.91%, the inoculation was 14.99% and the incubation days was 4.24d, the production of intracellular triterpenoids, intracellular polysaccharides and mycelia biomass was 100.654 mg/100ml, 58.5968 mg/100ml, 2.39258 g/100ml, respectively.
Evaluation of an Aerobic Denitrifying Bacterium for Wastewater Treatment
Authors: Zhang De Yong , Shen Xiu Ying , Xu Xiao Lu , Lu Yin , Hao Fei Lin
Published: December 2012

An aerobic denitrifying bacterium isolated from sludge was evaluated for water treatment application. The denitrification reaction condition was optimized using orthogonal experiment as temperature 30°C,pH7.0 and shaking speed 250rpm. The highest denitrification rate observed at 24h in the optimization experiment was 94.8%. Temperature was confirmed to be the most significant one in the four factors affecting the denitrification efficiency. In a comprehensive evaluation experiment for printing-dying wastewater treatment, the bacterium showed a satisfying water purification effects with obvious decreasing of COD, total phosphorous concentration and nitrate. The highest NO3--N removal rate occurred on day 3, which reached 94.2%.
Line Loss Rate Forecasting Based on Grey Model and Combination of Neural Network
Authors: Xie Fei , Zhou Bu Xiang , Zhang Qin , Jiang Long
Published: December 2012

This thesis is mainly focusing on the research of the method for line loss rate forecast by adopting grey model combined with neural network. Firstly, GM(1,1) model can be used to analyze and calculate line loss rate change trend. The input variables of the neural network could be determined by grey relationship of related factors. Three-Layer BP model for line loss rate forecast is constructed, and then the eventual result can be obtained by using the combined model of GM(1,1) and neural network method. An example is taken to prove the precision improved for line loss rate forecast by the proposed method studied in the thesis.
An Embedded Positioning System Applied to the Seismic Exploration
Authors: Zhang Bing , Xing Li Li , Chen Dan Qi , Xie Li , Li Yue , Ouyang Qun Bo
Published: December 2012

An embedded positioning system, which can be applied to seismic exploration, is designed. Meeting the characteristics of field work and the instantaneity of data transmission, the system is composed by the positioning terminals and supplemented by earthquake decision-making experts and monitoring center. With the style of mobile phone message and monitoring center, the real-time transmission and query of positioning data are mobile.