bluuebunny/crossref_metadata_2025 huggingface dataset:
The Simulation Experiments Research of Plow Bit Cutting Coal Rock Basing on Ls-Dyna
Authors: Hao Zhi Yong , Mao Jun
Published: April 2011

Using finite element analysis software ANSYS/ LS-DYNA, establishing the plow cutting coal seam 3D simulation model, simulating plow bit cutting coal seam dynamic process. under study, obtaining plow bit the cutting resistance, plow speed of time process curve, analyzing the influence on cutting energy consumption of the different cutting depth, separation distance and width, reaching the rule of cutting energy consumption changing with plow bits’ structure parameter and design parameters, in order to reduce the energy consumption and resistance, cutting depth and plow bits spacing ought to be selected by the real coal seam face conditions.
The Sensing Characteristics Responded by Resistance of Carbon Fiber Layer with Epoxy-Matrix
Authors: Fang Xi , Li Zhuo Qiu , Zhu Si Rong , Lv Yong
Published: April 2011

Carbon fiber composed with epoxy-matrix is revealed to be a kind of functional composite material, which has sound sensing characteristics. The sensing ability of mechanic-electric character and temperature-electric character of carbon fiber layer based on the epoxy matrix was experimentally discussed in this paper. Through the uniaxial tension the CF layer reveals a good performance by resistance changing with response to the loading. In temperature-resistance testing, CF layer also has a good response to the temperature changing by its resistance varying. Carbon fiber composed with polymer will provides a new kind of sensor which can be used as force sensor and temperature sensor as well.
Innovative Examples of Product Design Based on Material
Authors: Deng Xiao Shu
Published: April 2011

Material is physical basis and carrier of design, which is a very important part of product design. On the one hand, designers can make innovations on traditional shape through using new materials; on the other hand they can make it from new materials and techniques for reference. The author put forward a subject of “designing for sitting” in teaching, asked the students to think from the perspective of material and finish the prototype, good effect has been obtained through this training. The pictures used in this paper were schoolwork of partial students who major in art design of North China Electric Power University, thanks for their passion and creativity.
Study on Wear-Preventing of Needle Valve in Fuel Injection System Mounted on DME Engine
Authors: Wen Xin Rong , Zhang Guang De , Wang Wei Hua , Lu Xie , Jing Sun
Published: April 2011

The purpose of this paper is to provide theoretical support for the structural design to prevent the wear of needle. The actual wear of the orientation part of the needle in scrapped needles was researched. The presented results showed that the main reason to the wear of the orientation part of needle was the dynamic instability and the abrasives enter into the surface of orientation part which increases the wear, and that the calculation model of dynamic stability was proposed to prevent the wear of needle. This model was a pressure rod, one end of which was fixed, the other was free, and the two ends were pressed on axial force which changes with time. Besides, the classic formula of dynamic stability of pressure rod was changed rationally, so as to correspond with the calculation model. It will play a part in preventing the wear of needle.
Spiral Involutes and its Application in Gear Transmission
Authors: Huang Yin Hui , Lei Liu
Published: April 2011

Involute helical gears mesh based on the intersections of involute helicoids. However, spiral involutes on the tooth surface do not participate in meshing directly. A new type of gear drive, the spiral involute gear drive is proposed that works on contact of spiral involutes. The generation of tooth profile is introduced in detail. Through relative-stagnation method spiral involutes prove to have conjugation characteristics. To testify whether the transmission ratio of cylindrical spiral involute gears is constant, simulation is implemented in commercial codes ADAMS based on solid models of a pair of spiral involute gears. The computed results show that this novel gear drive can achieve a constant transmission ratio. Due to transmission with uniform velocity, cylindrical spiral involute gears can be used in transmission between intersecting axes, so that generating milling and generating grinding can be achieved.
Pattern Recognition of Typical Incipient Mechanical Failures in Circuit Breakers
Authors: Fan Fei , Wang Wei
Published: April 2011

To detect circuit breaker mechanical failures that are still in their early stages in order to avoid more serious failures and ensure reliable and safety of the grid operation, we uses a type ZW17-40.5 35 kV circuit breaker to simulate three typical incipient mechanical failures about stagnation of the energy storage spring, the dowel on the connecting rod and the moving arc. This analysis uses a digital camera detection method to record the processes for normal circuit breaker opening and closing conditions and conditions under stagnation. Additionally, by using a specially developed software to extract travel, speed and acceleration of specific location in every frame, we can discover features of the mechanical failure from the resulting data. This article provides a basis for identifying characteristics of stagnation and state monitoring of circuit breakers.
Research on Corona Wire Application for High Dust Load ESP of Cement Kiln
Authors: Liu Zhen Biao , Xu Li Zhong , Guo Xiang Sheng
Published: April 2011

Electronic corona may be obturated when dust load at inlet of ESP is more than 500g/Nm3, it will influence dedusting efficiency. Through analysis on current and electric intensity, we set up experiment device and use WS corona wire, fishbone corona wire, long dentation corona wire, V15 wire and RS corona wire to test their volt-ampere characteristics. This experiment indicates that the corona current produced by V15 and long dentation corona wires is higher, i.e. we can get higher corona current under same voltage to produce stronger corona discharge and electric wind, and it has little possibility to occur corona obturation in electric field. We can get the conclusion that V-typed corona wire is more suitable and economic for high dust load application.
Body Welding Quality Control Based on a CUSUM Control Chart
Authors: Li Rong , Li Jing , Liu Jian
Published: April 2011

Aiming at the situation in some Chinese auto companies that the workload of body welding quality inspection is high and the sample size is extremely small, a brand-new CUSUM Control Chart for variance monitoring is proposed in the paper to realize the effective quality control in body welding variance, whose principle is to use variance statistics based on Queensberry transformation Φ-1(G((n-1) St2/σ02)) to monitor infinitely small variances in the process of body welding. Evaluation instance results show that, compared with traditional CUSUM control chart, EWMA control chart and weighted CUSUM control chart, the proposed CUSUM control chart based on variance monitoring is more sensitive to the abnormal variation fluctuation and can detect the abnormity of quality variation earlier.
DTH Drill Fracture Analysis of the Key Parts
Authors: Zhang Ming Song , Zhou Cheng Jun , Zhao Chun Hua , Ke Jian Jun
Published: April 2011

Aiming at some DTH drill key parts of fracture phenomena often appear, the paper analyzes its fracture characteristics, under load conditions and fracture process, and indicating the fracture is the main cause of fatigue damage. Also according to the theory of fatigue, the article illustrates the material of surface treatment, geometric structure adjustment and precision, and prolongs its service life.
Research on the Cutting Performance of ZrN Coated Tools
Authors: Liu Jian Hua , Feng Yi Hua , Shi Lei , Zhang Qing Yu
Published: April 2011

Arc ion plating technique PVD ZrN coatings were deposited on YT15 cemented carbide. Microstructural and fundamental properties of the ZrN coatings were examined. The ZrN coated tools (DZ and GZZ) showed much better cutting performance compared to the YT15 uncoated cemented carbide, which is connected with their large hardness increase, and good abrasive wear resistance. The wear surface features of the coatings were examined by scanning electron microscopy. Results showed that the PVD ZrN coatings onto the cemented carbide substrate show high hardness and good adhesion with the substrate. Abrasive wear was found to be the predominant flank wear mechanism for the ZrN coated tools. While the mechanisms responsible for the rake wear were determined to be adhesion.
Temperature Field Simulation of Electron Beam Surface Quenching on Ductile Iron QT600-3
Authors: Wei De Qiang , Yi Yun Zhi , Wang Rong
Published: April 2011

According to the actual experimental condition of the scanning electron beam welder, a 3-D finite element model(FEM) model of the temperature field for the electron beam quenching of ductile iron QT600-3 was established by using ANSYS parametric design language. In the course of analysis, the heat transfer theory was applied. The temperature relativity of the thermal physical parameters, the phase transformation and thermal radiation were considered. The size of the hardened zone was calculated and experimented. The results show that the obtained experimental results show a good agreement with the simulation results. It indicates that the established numerical model is correct and reliable. The model provides a guide for studying the rule which it is heating and solidifying process of electron beam surface quenching. And the FEM model can be well used to obtain and optimize the processing parameters.
R&D on Wollastonite-Based Low Carbon Products
Authors: Wang Xi Yuan , Wu Xiang , Xu Xiao Wen
Published: April 2011

The thesis raises an idea of researching and developing synthetic material of wollastonite in four-molding and simple-molding method through the analysis on the energy consumption of traditional ceramic sanitary products, and comparatively studies the energy consumption and carbon emission of traditional sanitary products and low carbon sanitary products and verifies the applicable value of the latter, providing a basis for the R&D of low carbon sanitary products.
A Quantitative Study of Precipitation Evolution during Annealing Treatments of a Ti-IF Steel
Authors: Zhu Guo Ming , Lu Chao , Kang Yong Lin , Gao Lu Feng
Published: April 2011

The evolution of precipitates size distribution of Ti-IF steel during annealing process has been investigated by simulating different continuous annealing (CA) and batch annealing (BA) treatments. The size and distributions of the precipitates (TiC in particular) are obtained by TEM observation and measured image analysis. They are then fitted by log-normally distribution and a model demonstrating the relationships of particle size distribution with annealing process parameters has been developed and validated by experiment results. The fine TiC precipitates (< 30 nm) vary after different annealing treatments. The effects of annealing temperature and holding time on the evolution of TiC particle size distribution are discussed.
Study on CTOD Fracture Toughness of Welded Joint of X80 Marine Drilling Riser
Authors: Wang Peng , Hu Mei Juan , Dang En
Published: April 2011

This document demonstrates CTOD (crack tip opening displacement) tests at0°Cof welded joint in X80 marine drilling riser in accordance with the BS 7448 standard. The three point bending specimens are made in the weld center line and heat affected zone for the butt-welded joint in Φ533×25.4mm X80 marine drilling riser respectively according to the requirement of the standard. The CTOD testing results are discussed in detail, which can provide the basic to evaluate and optimize the welding and heat treatment technology of marine drilling riser.
Development of the 600MPa High Aluminum Galvanized Dual Phase Steel and its Application
Authors: Wang Hui , Lin Cheng Jiang , Deng Zhao Jun , Yang Peng , Yan Fei , Tan Yun Gang
Published: April 2011

An original 600MPa high aluminum galvanized dual phase steel had been successfully developed in this paper. The microstructure analysis showed that the microstructures of the steel mainly consist of ferrite and 8%~11% martensite as well as 4%~6% retained austenite which distributed around the ferrite grain boundaries. TEM analysis demonstrated that there exists lots of high density dislocation in ferrite, obvious twin-structures in martensite and some retained austenite in the microstructures. The existence of the retained austenite makes some contribution to the higher elongation of the steel. The tensile test showed that the steel delivers an excellent mechanical properties of Rp0.2=350~400MPa,Rm=610~650MPa, A80mm=26%~30%, n=0.17~0.21 and an excellent bake-hardening value of 50~70MPa. Ball-Punch Experiments showed that the galvanizing dual phase steel had a good and satisfying coating adhesion. Owe to the excellent formability, the steel has successfully been used in the production of some auto parts.
Image Recognition Based on Euler Sequence by PCNN
Authors: He Shui Ming , Ning Yan Bin , Fu Lei , Qin Jian Ying
Published: April 2011

The aim of this paper is to research the image recognition system and its applications, which is based on combining the traditional BP neural networks and the third-generation pulse coupled neural network (PCNN).The process is by extracting the image's Euler number sequences, then through the fast Fourier transform, and finally as inputs of the pattern classification. In order to test the stability of the system, we make some varies by rotating, tension and compressing the original image, meanwhile, combined with extracting the features such as time sequence, entropy sequence to do compare, the recognition results is satisfactory.
The Study of Destruction Status of Inclined Shaft Second Lined in Liangshui Tunnel
Authors: Liu Nian , Jing Ke , Qi Su , Tang Wen Jun
Published: April 2011

The tunnel in Liangshui goes through bad geological areas, so it makes the construction work difficult. The overall length of the inclined shaft is 372 meters, and the longitudinal slope is 9.28 downgrade. The surrounding rock deformation appears and the vault subsides, and the joist steel deformation and second lined concrete crack happens too, with serious phenomenon of polenta uplift. The reasons for these phenomena are weakness of supporting structure and stiffness and the function of water as analyzed. In accordance with these phenomena, measures such as adding arch frame, grouting small catheter, steel, anchor and increasing shot concrete strength and increasing thickness, as well as making downstream slope, ditch and sink were taken, so as to make sure of the smoothness of the construction work.
Improvement of Hood Hinge Based on Protection of Pedestrian Head
Authors: Hu Zheng Cai , Yu Duo Nian , Hang Liu , Feng Fang Zhi
Published: April 2011

This paper established finite element models of adult head based on GB/T 24550-2009 and hood of a car. When the finite element model of the adult headform impactor was established, tests were carried out to prove that the impactor was valid. Then experiments were carried out at adult head test area of the hood. The results show that some areas of the hood are too hard where the hood hinges are installed. It is very bad for pedestrian head to hit those areas in accident. In order to protect pedestrian head efficiently, this paper proposed a new kind of hood hinge, called buffer-type hinge. Comparison tests were carried out. The buffer-type hinge is proved to be more effective to protect pedestrian head in traffic accident.
Electronic Structure and Chemical Bond of TiB2-Al2O3 Composite
Authors: Min Xin Min , Zhu Lei , Zhu Chuang
Published: April 2011

TiB2-Al2O3 composite was studied by the first principle method. Ti maintains a high positive charge and O increases more charge (absolute value) in the interface, so there is strong ionic interaction among the ions in the interface of TiB2-Al2O3 composite. There is strong covalent interaction among the atoms in the interface of the TiB2-Al2O3. There are some differences of densities of state (DOS) between TiB2- Al2O3 composite and related single phases as the interaction between of TiB2 and Al2O3 phases. The width of DOS of interface Ti 3d is obviously larger than that of inner Ti, and larger than that of TiB2 single phase, which shows that the interaction among atoms in the interface is stronger than that in the center.
Weakening Hydrogen Bond of Thick Oil of Petroleum by Several Catalysts
Authors: Liu Hong Fei , Min Xin Min , Chen Yan Ling
Published: April 2011

The process of use catalyst or functional material that contains iron ion to weaken -O-H-X- (X=O, N and S) bond of the thick oil to reduce viscidity or crack, in aspects of the ion charge, covalent bond order, total energy and the average distance of Fe-X, is studied with density function theory and discrete variational method (DFT-DVM), one of the first principle methods. Sulfur is with positive charge, and the hydrogen bond of -O-H-S- does not form. The strength of -O-H-N- hydrogen bond is a bit larger than that of -O-H-O-. With the decrease of the distance of Fe-X (X=O, N), the charge of Fe ion increases, the charge of hydrogen ion decreases, and hydrogen bond is weakened.
Stability Analysis for Descriptor Neutral Systems with Mixed Delays
Authors: Liu Xiu , Zhong Shou Ming , Ding Xiu Yong
Published: April 2011

Delay-dependent stability of descriptor neutral systems with mixed delays is investigated in this paper. Based on descriptor system approach, some new delay-dependent stability and robust stability criteria are established in terms of a operator and linear matrix inequalities(LMIs). Lyapunov-Krasovskii functional and Leibniz-Newton formula are applied to find the stability results.
Module Design Based on Life Cycle Design
Authors: Zhang Jun Xia , Wang Wei Wei , Cao Sai Sai
Published: April 2011

To achieve sustainable development, conserve energy and reduce emission are the themes of modern society. Life Cycle Design is an important design philosophy while Modular Design is one of the modern design ways which produced in the economic development. This paper presents a more perfect Modular Design based on Life Cycle Design. This paper will be developed in three parts: the first part introduces the basic concepts of the Life Cycle Design, Modular Design and the relationship between them; the second analyses the necessity of Modular Design in all stages of the product life cycle and the matter to be attended to; and third presents the method and steps of the Modular Design based on the Life Cycle Design and takes the design of range hood as an example in order to explain it.
Airfoil Design and Numerical Analysis for Morphing Wing Structure
Authors: Dong Wen Jun , Sun Qin
Published: April 2011

This paper investigates an unconventional honeycomb cellular structure featuring a negative Poisson’s ratio with the ability to undergo large overall displacements with limited straining of its solid material in the spanwise direction. Numerical analyses are performed to exploit such properties in the design of a morphing airfoil. The commercial simulation software ANSYS is used to carry on these processes. The cellular structure is designed to satisfy the requirements of configuration changing occurred while wing morphing. Finally, detailed numerical models of the structures are presented as a possible approach to evaluate the stress distribution of the structure. According to simulation results, the airfoil designed in this paper has the property of negative Poisson’s ratio, which is useful to the morphing wing aircraft design.
Research and Development of Intelligent Design System for Machine Tool Fixture Based on KBE
Authors: Liu De Fang , Wu Hong Pan , Li Li Ying
Published: April 2011

In this paper, KBE and some key technologies, such as knowledge representation, knowledge reasoning and knowledge base design, are studied for solving the exiting design problems of modular machine tool fixtures. The methods of hybrid knowledge representation based on ontology and rule-based and case-based hybrid reasoning are introduced to intelligent design of modular machine tool fixtures. By researching the design flow of modular machine tool fixtures, a modular machine tool fixtures intelligent design system (MMTFIDS) is developed based on secondary development technology of UG/NX in the VS.NET integrated development environment. The system realizes the reuse of design knowledge and rapid design for modular machine tool fixture.
Finite Element Analysis of Rotary Kiln Cylinder
Authors: Jia Xian Zhao , Zhang Zhi Wen , Liu Hong Bin
Published: April 2011

As the core equipment of the metallurgy, cement, chemical production enterprises, the mechanics status analysis of rotary kiln cylinder is paid close attention on engineering site because of its frequent damage and expensive maintenance cost. With two supporting the lime rotary kiln was studied in the paper, the cylinder shell, kiln lining and materials were looked as a whole system, the cylinder and kiln lining were modeled with lamination and partition, the various factors to stress of the kiln cylinder were researched, such as the cylinder axial thickness, the cylinder axial materials and materials in it, the finite element software ANSYS was used to analyze the structure stress and thermal stress distribution status of cylinder, the analysis results are helpful for the design and optimization of rotary kiln cylinder.
The Research of Virtual Tactile Design Application in Dongba Sculpture
Authors: Hu Rui Bo , Xu Ren Ping , Wang Kun Qian , Li Jing Yuan
Published: April 2011

Along with the rapid development and popularization of modern computer technology, Virtual tactile design software have been born, which is mainly characterized by its simple operation, quick production lines and the low cost of production, showing the powerful vitality. This article, based on the virtual touch-type design software--Freeform, adopting advanced technologies, "virtual sludge", "virtual design", and "force feedback" to design, takes Dongba sculpture as an example to analyzes the advantages, such as design process, innovative consciousness, mass production, and ways of reducing the product cost, which paves the road of prospects for this software and the sustainable development of modern sculpture in Dongba.
Performance Research on the Axial Flow Fan Adding Guide Vane
Authors: Rui Wang , Wang Yi Chun , Zheng Hong Fei , Feng Chao Qing
Published: April 2011

Fan is a major part of the cooling system in the vehicle, axial flow fan is used very common recently. In order to improve the cooling capability, cooling fan’s structure has been changed; experiment research and numerical simulation are done for it. The result show that after adding guide vane to axial flow fan, its mass flow increases. At the same speed, the mass flow is increased by 20% when a rear guide vane is installed, and 15% of mass flow increase when the front guide vane is installed, which indicates that a mixed flow fan could be increased in flow and improved in performance if the guide vanes are installed. Rear guide vane is better than front guide vane in the aspect of improving mass flow. Take front guide vane as an example, adopting the NUMECA for numerical simulation, the result is as similar as the experiment’s.
Experimental Study of Critical Quality in Vertical Narrow Annular Channels
Authors: Su Shun Yu , Huang Su Yi , Chen Jian
Published: April 2011

Flow boiling heat transfer in vertical narrow annular channels with dual tube heating has been experimentally investigated using distilled water as the working fluid. The experiments were made on two types of test section within the experimental range: heat flux, 40-210 kW/m2; mass flux, 45-180 kg/m2s; system pressure, 2-3.5MPa; gap size, 2mm and 3mm. The intention of this paper is to experimentally survey the flow boiling dryout mechanism of liquid film on the tube wall of vertical narrow annular channels with heated length of 1300mm. The values of dryout temperature, while the heating rate reaches critical heat flux, could be measured in the experiments. And the values of the critical quality xcr were calculated by thermodynamic equilibrium. The main factors which have influence on critical quality, such as mass flux, dimension of the narrow channel, heat flux and water inlet temperature were analyzed based on the experimental data. The empirical correlation which used to calculate critical quality in vertical narrow annular channels in similar conditions was given here. The calculation results of this correlation were compared with experimental data and agreed well with it while the deviation is less than 15%.
Experimental Study on Running-In Criterion of Remanufacturing Gasoline Engine in Acceptance Test
Authors: An Xiang Bi , Wang Hu , Jiang Da Hai
Published: April 2011

Remanufacturing engines don’t pass the test without running-in process. And most of them never so much as reaching 85% of the standard index. After a careful analysis, it is believed that mainly be caused by being lake of enough running-in process. Then a cycle running-in criterion with low data is designed to verify the speculation, and it even don’t reach 50% of full load level. The results show that remanufacturing engines show a good performance, and they can also reach qualified index. Then, based on the variation of dynamic performance of remanufacturing engines, more engine tests have been done to optimize the running-in criterion. After that, a new running-in criterion established which improves efficiency. Moreover, it is proved effective, too.
Kinetic Analysis of Planetary Gear Box
Authors: Li Wei Sheng , Yu Li Ming
Published: April 2011

Structure noise of marine gearbox seriously affects warship’s concealment, stability of transmission system and amenity of crew working environment. There are many ways to control structural vibration. To add damping in reduction gear box is an effective measurement to suppress box resonance. The key to design damping structure is to determine the parameters of the structure. In most instances, the structural parameters depend on experience and many experiments, which is lengthy and expensive. This paper made an analysis at design stage of reduction gear product by finite element method. This can determine the parameters of box structure, and reduce the input effectively. This method has important theoretical value and application prospect.
Three-Dimensional Dynamic FEM Simulation of Block Temperature Distribution for Fusion Welding Rapid Manufacture Process
Authors: Jia Jian Ping , Yao Shun Ping , Zhu Zheng Qiang
Published: April 2011

Due to the establishment of thermal equilibrium is very rare, some cases not possible, so the accuracy of temperature measurement is often difficult to ensure that no one will be allowed or asking for too much more to the transient temperature measurement is difficult. Based on the finite element software ANSYS platform, according to the feature of fusion welding, the impact of heat on the welding and the welding temperature field is simulatd by the Three-Dimensional Dynamic FEM simulation of the ANSYS software. Finite element numerical simulation results with the test weld shape with good consistency, so that the body welding Gauss heat source model is used to simulate the temperature field is reasonable.
Thinking about the Theory Construction of Chinese Industrial Design
Authors: Wu Qiong , Zhang Li Na
Published: April 2011

Concerning on the current vague definition of industrial design in China, this paper indicates that industrial design and engine design are compound concept. In the first place, it introduces the definition and theory of industrial design. Then, by analyzing design development and industry development relationship, it regards modern industrial design as a heritage and a production from the development of traditional handcraft design. Finally, it proposes that in order to regulate a modern design theory with Chinese characteristics. We must learn the advanced industrial design theory from the west. At the same time, we must fully excavate the essence of traditional Chinese handicraft culture. Also we should integrate Chinese traditional handicraft design theory into the west modern industrial design theory.
The Research of Trajectory Software Design Based on Cruise Missile
Authors: Li Qiang , Xia Qun Li , Cui Ying Ying , Wen Qiu Qiu
Published: April 2011

The paper connects trajectory model with the man-machine interface of MFC, which can make the flight parameters and trajectory-drawing together in real-time, being the favorable interaction platform of trajectory design. Through the integrated platform users can obtain a series of flight parameters, such as flight time, velocity, location, impact angle and so on. So we can obtain the changing rule of parameters directly, which can be the basic elements for feasibility and optimization of the whole trajectory design. The platform has modular programming language, and every module has independent function, which can be called by other software independently. With standard structure definition, input/output interfaces meet the function of communication. And the platform has some interface for the secondary development.
The Weight Distribution and Configurability of Process Collaboration
Authors: Yan Dong , Dong Ming , Yu Sui Ran
Published: April 2011

Based on the process reuse, a great number of process chains in a computer aided process planning (CAPP) system can form into a large process network as a collection of process collaborations with a large weight and processes with a larger strength. This paper aims to study the topological structure, weighted connectivity and assortativity, and configurability analysis of a realistic turbine process network. The empirical analysis indicates that the nonequilibrium weight distribution reveals a decaying power-law behavior, whereas the weight assignment of process collaborations behaves randomly, and has an assortative relationship with degrees of quite a few processes. In this paper, an evaluation method of configurability of process couples is proposed based on assortativity, and then the process configurability can be classified into the strong and weak ones.
Submicron Tungsten Powder Prepared through the Circulatory Oxidization-Reduction Method
Authors: Fu Xiao Ming , Xie Chen Chen , Zhou Liang Yi
Published: April 2011

Tungstic oxide is prepared with pure ammonium paratungstate in the air. And then Tungsten powder is obtained with tungstic oxide through deoxidation in the hydrogen gas (Rate of purity: 99.99 %, dew point: -40 °C), and tungsten powder is oxidized in the air. Tungstic oxide is reduced into tungsten powder in the hydrogen gas. The above routes are repeated. The samples are characterized by the laser particle size distribution measuring instrument and the electron probe scan instrument. The results show that submicron tungsten powder is obtained through circulatory oxidation twice and reductiuon three times. The volume percentage of the particle size distribution of submicron tungsten powder between 0.1 μm and 0.5 μm is 94.81 %.
An Integration Method for Rolling Bearing Fault Diagnosis
Authors: Li Li , Wang Hong Mei , Zhao Chun Hua
Published: April 2011

The paper presents an integration method of artificial neural network (ANN) and empirical mode decomposition (EMD) to identify fault severity in rolling bearing. A test apparatus is established, in which the rolling bearings with different faults and defect sizes are tested. Fault severity is divided into four grades of normal, light, middle and severe based on the defect size. Vibration signals are collected from the test rig. Due to the complexity of the signals, EMD has been exploited to decompose the signals into a series of intrinsic mode functions (IMFs). Then an ANN with one hidden layer is designed to diagnose the fault type and severity. The virtual values of first eight IMFs of a signal form the input vector of ANN. The output vector of ANN represented the fault severity with two binary digits. Appling the ANN to test the signals with unknown defect sizes, the diagnosis capability can arrive to about 95%. The results demonstrate that the integration method is successful in machine fault severity diagnosis.
Mechanical Behavior and Constitutive Equation of Concrete under High-Temperature Dynamical Conditions
Authors: Jia Bin , Li Zheng Liang , Tao Jun Lin , Zhang Chun Tao
Published: April 2011

SPHB tests of concrete under different temperatures and various loading conditions are completed, and high-temperature dynamical behavior of concrete is obtained. Dynamical mechanical behavior of concrete with high temperature is affected by not only the strain rate effect, but also the high temperature weakening effect, and the strain rate hardening effect is coupled with high temperature weakening effect, but the latter has greater influence. Concrete failure evolution is described on basis of the damage factor, the intercoupling strain rate hardening effect and temperature weakening effect are simply set as mutually independent factors, each parameter is respectively fitted with test data, finally, concrete constitutive equation under high-temperature dynamical conditions is established, and comparative analysis with test data are conducted, indicating good coincidence with test results.
Micro-Ploughing Process of Copper Current Collector for Lithium-Ion Battery
Authors: Tang Xing Xian , Tang Yong , Ye Bang Yan , Lu Long Sheng
Published: April 2011

A three-dimensional “fin-groove” composite structure copper current collector was fabricated by micro-ploughing process. 3D and common 2D carbon anodes for lithium- ion batteries were prepared. The electrochemical properties of these electrodes were studied by linear sweep cyclic voltammetry (CV) and charge-discharge (C-D) test. 2D anode showed high contact resistance, high coulombic efficiency but poor cycle performance. In contrast, 3D anode showed the structure superiority in reinforcing bonding force between active materials and copper substrate, improving the conductive environment and alleviating volume changes. It was believed that 3D anode can keep high coulombic efficiency and improve the cycle performance of lithium- ion batteries.
Study on Lubrication Properties of Emulsion for Aluminum Cold-Rolling
Authors: Wang Wen Xia , Liu Ping , Yao Guo Qiang
Published: April 2011

Paper discusses that water content of emulsion has effects on the surface quality of cold-rolled aluminum alloy 5052 and higher concentration of emulsion gave thicker lubrication film and better surface quality of aluminum strip. When the speed of rolling reaching a critical speed, thickness of emulsion film will decrease with time. Film forming of emulsion shows that when rolling speed is low, properties of emulsion is similar to that of oil, while when speed reaching a critical value, mechanism of lubrication in rolling work zone will change from plate-out model suitable for low rolling speed to starvation model suitable for high rolling speed .This paper also discusses friction model for cold-rolling, and explains that the contact length of work zone and strip and forward slip get greater with rolling reduction increasing , which easily result in lubrication failure in the work zone.
Preparation of Spherical NiO Nanoparticles by the Thermal Decomposition of NiC2O4 2H2O Precursor in the Air
Authors: Fu Xiao Ming , Yang Zai Zhi
Published: April 2011

The pyrolysates of NiC2O4. 2H2O in the air were investigated by TG-DSC, SEM and TEM. The results showed that there are two stages in the process of the pyrolytic decomposition of NiC2O4. 2H2O in the air. The crystal water in NiC2O4. 2H2O was lost from 175 °C to 275 °C. NiC2O4 was pyrolysized into NiO from 325 °C to 400 °C. In the process of the pyrolytic decomposition of NiC2O4. 2H2O, the influence on the pattern of the decomposition was more from 246.5 °C to 357.8 °C. The influence on the pattern of the decomposition was less from 357.8 °C to 400.0 °C. Therefore, the pyrolytic condition of NiC2O4. 2H2O in the air was controlled if the effective pattern of NiO powder was obtained. At the same time, spherical NiO of about 5 nm is obtianed through the pyrolytic decomposition of NiC2O4. 2H2O at 400 °C for 10 min at the rate of 10 °C / min.
Design of New Excavator with Telescopic Arm
Authors: Chen Chuan Can , Chen Xi Dong
Published: April 2011

In order to make better use of excavator in foundation pit, a new excavator with telescopic arm is designed in this paper. The innovations mainly manifests in four aspects. First, the use of telescopic arm decreases the height for the excavation in foundation pit. Secondly, the design of truss-guide and trolley brings a high speed to excavator’s lateral move in large scale, easy for dirt shoveling in the wide foundation pit. Thirdly, the travelling system with two pails of dual-pedrail makes it possible for excavator free walking, flexible steering, and obstacle avoiding. The last but not the least, the wireless remote control technology can keep operators distant from danger and other unpleasant working conditions.
Predicting Fracture Toughness of Three-Point Bending Specimen from Tensile Test Based on Micro-Plastic Damage Model
Authors: Wang Bin , Ma Chao , Wang Peng
Published: April 2011

In this research X65 steel is chosen as the test material, and tension test and three-point bending test of X65 are made, then we got the load - displacement curve and the resistance curve. Using the finite element method to derive load - displacement curves of tension test based on the micro-plastic damage model, and the parameters controlling ductile crack growth are gotten by compared with the test results. We obtained the resistance curve of numerical calculation by WARP3D based on the parameters, which in good agreement with the experimental results. The results indicate that the three-point bending fracture toughness can be predicted by tension test based on micro-plastic damage mechanism.
A Discussion and Economic Analysis of Oxygen-Enriched Combustion Technology in Metallurgic Furnace
Authors: Zhang Xiong , Wen Zhi , Lou Guo Feng , Wang Nai Shuai
Published: April 2011

The purpose of this paper is to discuss the application of oxygen-enriched combustion in metallurgic furnaces. Based on the knowledge of combustion and air separation, some advantages of oxygen-enriched combustion are carried on. In this work, the relation between energy efficiency and oxygen enrichment is presented, the result showed that furnaces can reach more than 10% energy saving by properly applying oxygen-enriched combustion technology. A system which combines the oxygen-enriched combustion technology and the CO2 capture with membrane separation technology is evaluated. In this system, the energy cost for CO2 capture can reach 0.9GJ/(t CO2). Finally, some problems that still need further study are also discussed.
Ergonomics Analysis Thinking of the Operation Domain Design of Workover Machines
Authors: Shu Qi , Wang Bing Gang
Published: April 2011

Nowadays there is little ergonomics consideration in the oil engineering machines and the improvement of comfort levels in the high intensity work of oil workers should be noted. Taking the case of the interface design of operation domain of the workover machines, this paper studied the design method of man-machine interface of oil workover machines basing on its development trend, from the view point of improving operation efficiency and operating reliability. In the paper two kinds of software, SolidWorks and CATIA, were used to build 3D virtual human body models and conduct the man-machine interface design of the workspace. Ultimately, a new thinking of man-machine interface optimization design of oil machinery was obtained by making a comparison of the two design processes.
Scheme Research of Mould Opening Degree Auto-Detecting Device
Authors: Tan Li Bin , Yu Xiao Liu , Dou Qin Qin , Zhang Qian Qian , Ge Zhuo
Published: April 2011

A scheme of mould opening degree auto-detecting device is proposed. The inner-wall dimension of mould working segment can be measured and the opening degree can be calculated by using the auto-detecting device. Due to the mechanical structure design the off-line measurement in mould opening degree is realized. The paper analyzed the factors which causing error and calculated the error corresponding to these factors, so the total error is obtained. The hardware and software system is designed based on VC++ GDI. The measurement result is displayed in screen using curve mode.
Development of a Robotic System to Examine Outer Cylinder of Pipes in Steam Generators
Authors: Min Li , Zhang Ya Nan , Gong Zhen Bang
Published: April 2011

The examination of outer cylinder of pipes in steam generators is difficult to fulfill due to confined space. A robotic system has been developed to do the job. The robot contains a base, four rotary balls, a slide guide, two steppers, a DC motor, a positioning mechanism, a synchromesh belt mechanism, a longitudinal mobile platform, an extending and retracting mechanism, a rotary platform and a micro vehicle. The positioning mechanism can locate and fix the robot efficiently. The motion of the robot consists of longitudinal motion and transverse motion. The extending and retracting mechanism can push and pull the micro vehicle carrying a micro CMOS camera. The pose of the camera mounted on the movable platform of a micro 3-CSR parallel mechanism can be adjusted by 3 bias-two-way SMA actuators. The control system consists of two levels of computers. The user interface was developed with VB. Fuzzy control method is utilized to control the motion of the longitudinal mobile platform. Grey evaluation method is applied to evaluate the status of checked areas according to obtained images. Experiment results indicate that the robot has met the needs of examination.
Robot Based Manufacturing Technology of Cast-Steel Joints of Sunny Valley at Shanghai World Expo Axis
Authors: Mei Jiang Ping , Tan Yang , Wang Lan , Zhang Wen Chang
Published: April 2011

Due to the complicated structure of the cast-steel joints of Sunny Valley at Shanghai World Expo Axis, its mass production method faces many problems. In order to manufacture the qualified joints with low cost, high efficiency and high quality, a robot-based manufacturing technology with lost foam process is proposed. With this technology, all joints can be decomposed to standard units. After being cut and assembled by robots, these units can form a complete lost foam joint model used in the lost foam casting process. The cast-steel joints manufactured are measured by three-coordinates measuring machine. Results show that this technology is effective.
A Brief Analysis on Characteristics and Ideas of the Design of New-Type LED Domestic Lamps
Authors: Wu Ping
Published: April 2011

This article firstly compared the domestic and foreign design status of LED lamps, and then pointed out the necessity and significance of developing new-type LED domestic lamps in China. After that it briefly analyzed the rational factors that would affect LED lamp design and illustrated the design ideas of new-type LED domestic lamps with selected cases.
Research of Produt Design on the Basis of DNA Theory
Authors: Li Hong Gang , Zhao Hong Mei
Published: April 2011

There are many ways of designing product. The article adopts the way , a systematic design by introducing the genetic theory of biological DNA( half-kept copying way) , that is to continue the identifying feature and they have some similarities in creation. The article combines gene of DNA in the biological field and industrial designing theory ,then to explore the basic theory of DNA product in the industrial designing by referring to the engineering theory of gene. In addtion, the article discusses DNA and its concept of DNA product and analyzes the comprising of DNA, then to apply the theory of DNA product to the product design. On the basis of analyzing their theories and have a research of DNA and product DNA, we select the electric pot of Medi Firm, a domestic bigger houshold electrical appliances enterprise, to make a modeling reseach and design.
The Product System Design under the Guidance of the Principle of Semantics
Authors: Wu Qiong , Chen Ruo Xi
Published: April 2011

The product design is divided into conceptual design and improved design in the field of industrial design in China featuring with free semantic design and pure styling design. With systematic process ignored, the product design could hardly guide its practice. All cultural phenomena are symbol phenomena, so is product design as an important cultural creation on which progress of human society depends. The product system design under the guidance of the principle of semantics makes some factors as symbols of product, including function, material, structure, Man-Machine, image shape, math physics, etc, to probe the specific process and method of code switch in the course of product design system.
Fuzzy Logical Control Algorithm Based on Engine on/off State Switch for Hybrid Hydraulic Excavator
Authors: Lai Xiao Liang , Guan Cheng , Lin Xiao
Published: April 2011

When the hybrid hydraulic excavator worked in a low load and high battery SOC value state, the maintenance of the engine working would cause unnecessary loss during energy conversion, therefore it was required to shut down the engine at this moment. Then a fuzzy logical control algorithm based on the engine on/off state switch was proposed for the hybrid hydraulic excavator. By comprehensively evaluated the current external load level, value of battery SOC and the duration of engine former state, the engine on-off state switch rules and trigger condition were established, also, parallel or pure electric driver system patterns was formed. By using MATLAB/Simulink to establish a dynamic mathematical model, the power system control performance and fuel consumption were analyzed after the application of the algorithm. The results showed that the fuzzy logic control algorithm had strong applicability for the external load changes, and the engine on/off state switch could reduce the redundancy of the energy conversion process, the machine fuel consumption when the excavator is in a low-load condition with high battery SOC.
Study on the Critical Cutting Thickness and the Precision Cutting Experiments of Isotropic Pyrolyric Graphite
Authors: Wang Ming Hai , Wang Hu Jun , Liu Zhong Hai
Published: April 2011

Isotropic pyrolyric graphite (IPG) is a new kind of brittle material, it not only has the general advantages of ordinal carbonaceous materials such as high temperature resistance, lubrication and abrasion resistance, but also has the advantages of impermeability and machinability that carbon/carbon composite doesn’t have. So it can be used for sealing the aeronautics and astronautics engines turbine shaft and the ethylene high-temperature equipment. The mechanism of this material removal during the precision cutting was analyzed by using the theory of strain gradient. The critical cutting thickness of IPG was calculated for the first time. Furthermore, the cutting process parameters such as cutting depth and feed rate which corresponding to the scale of brittle-ductile transition deformation of IPG was calculated. The prediction model of surface roughness in precision cutting of IPG was developed based on the Genetic algorithm. Using the surface roughness prediction model, the study investigates the influence of the cutting speed, the feed rate and the cutting depth on surface roughness in precision turning process was researched.