bluuebunny/crossref_metadata_2025 huggingface dataset:
Study of Assessment Method of Aviation Material Readiness
Authors: Liu Xin Ling , Tao Chun Hu
Published: September 2011

Analyze and represent the main problem about aviation material application, that is the low readiness and large dispersity. Technology readiness assessment and the universal technology readiness level standard of USA are introduced. On the basis of analysis and studying the aviation material engineering application and according to 9-level technology readiness standard, we put forward material readiness level and level entries, using which you can assess material readiness straightway. We also put forward material readiness assessment method and course, and it is more simple and convenient, namely, at first, assess the material readiness roughly, then assess the entries detailed of this level and afford corresponding evidences, at last, confirm the material readiness. In the course of assessment, the technic decomposing and crux technic elements recognizing are not requisite. The characteristic of material readiness assessment is decided by material development rule.
Hot Strip Rolling State Analysis Based on Geodesic Distance Spectral Clustering
Authors: He Fei , Wang Xiao Chen , Liang Zhi Guo , Ma Cui
Published: September 2011

In the hot strip rolling production process, mechanical properties are detected offline. The process data is used for clustering analysis to acquire the state in advance. During the mechanical properties detection, the outliers in the same steel grade are regarded as the focal points. Spectral clustering is one of the advanced methods, where the Euclidean distance as the common similarity measure, can only extract the features of the spherically distribution data and can not express the complex distribution data. In this paper geodesic distance is introduced to spectral clustering, which is used to do the production state clustering. The Tennessee Eastman and hot strip rolling process data are used for model validation, as a result the proposed method has better performance on clustering, compared with the Euclidean distance.
The Action Mechanisms of BIMGCS12-3 as Corrosion Inhibitor of Mild Steel for Vitriolic Acid Pickling
Authors: Sun Yong Ming
Published: September 2011

Propanediyl-α, ω-bis-(N-dodecyl benzimidazole ammonium bromide), (abbreviated as BIMGCS12-3), was tested as inhibitor for the corrosion of mild steel in 1M H2SO4. It was found by weight loss technique that prepared inhibitor adsorbed on mild steel surface forming a protecting film. Polarization curves show that BIMGCS12-3 acts as mixed type inhibitor. Moreover, surface morphological examination has been carried out by SEM.
Influence of Heat-Treatment on High-Phosphorus Ni–P Plating Coating
Authors: Wu Xiao Juan , Liu Zheng Jun , Li Guo De
Published: September 2011

The high-phosphorus electroless Ni–P plating coating with 11.64 at.% was prepared by electroless technology. By means of x-ray diffraction and scanning electron microscopy, the morphologies and phase structures of coating were analyzed. Furthermore, the mechanical properties of coating were studied by micro-hardness tester and universal friction-wear testing machine. The results reveal that, with increasing heat-treatment temperatures, the hardness and the wear resistance of the coating are enhanced increasingly. Treated by 1 hour at 500 oC, the hardness and the wear resistance both display a optimum value, i.e. 1004 HV and 1.5×10-3g, respectively. The thermal shock test suggests that between coating and matrix exist a perfect cohesion.
The Relationship between Substrate Roughness and Wettability of Superhydrophobic Metal Carboxylate Surface
Authors: Li Feng , Geng Xing Guo , Chen Zhi , Zhao Lei
Published: September 2011

This letter introduces the properties of superhydrophobic metal carboxylate surface. The relationship between wettability of superhydrophobic metal carboxylate and substrate roughness has been studied by choosing sandpaper with roughness range from 80 to 2000 grit as substrates. The superhydrophobic effect has been found interrelated to substrate roughness. This phenomenon has been analyzed both experimentally and theoretically. This work has guidance significance to control the wettability in industrial production.
Review of Technology and Industry on Inorganic Non-Metallic Materials
Authors: Xu Yun Yun , Li Xin Nian , Zhou Shan Dan , Zhang Tao , Li Zheng Ming
Published: September 2011

Inorganic non-metallic materials are indispensable and fundamental materials to develop modern industry, agriculture, national defense and science and technology. With the recovery and development of global economy, inorganic non-metallic materials come close to important program opportunity. This paper reviewed recent development on inorganic non-metallic materials technology and industry and analyzed development trend, aimed at providing references for development on inorganic non-metallic technology and industry in Jiangxi province.
Variable Universe Fuzzy Control of Vehicle Cruise Control System Based on FSM Theory
Authors: Wu Zhuang Wen , Gao Qi Feng , Ren Hai Lei
Published: September 2011

A vehicle Cruise Control System(CCS) was designed based on Finite State Machine(FSM) theory and variable universe fuzzy logical theory. The system can control throttle angle and brake pressure coordinately by modeling vehicle powertrain. The simulation results show that vehicle under the proposed system controlled can be drived along the state switch curve, so as to make the vehicle follow the desired acceleration command accurately. And this control system provides satisfactory tracking performances and suitability insinuations such as traction, vehicle tracking and braking.
Design and Finite Element Analysis of the Assemble Tooling System for Aircraft Thin-Wall Components
Authors: Chen Yan Hai , Han Xiao Guang , Yang Ye Guang , Li Yu Zhu
Published: September 2011

Aiming at the problems of low assembly precision and inefficient in the process of assembling thin-wall components of aircrafts , using the CATIA software to establish the 3D–model of the thin-wall components flexible tooling system. In order to improve the weak links of the system , application of the finite element software ANSYS to analysis the system, and using industrial PC to realize the controling of the whole system.
Rigidity Analysis of FA pin-Cycloid Drive
Authors: Lei Lei , Guan Tian Min , Li Jiang Bo
Published: September 2011

When the FA pin-cycloid drive is used in high precision control drive system, especially in the robot drive, there are strict requirements to torsional rigidity .Usually in rated torque, the elastic lost motion produced by the torsional elastic deformation must meet certain precision. This paper analyzes all kinds of elastic factors which affect the rigidity, establishes mathematical model of the machine rigidity and calculates the rigidity for the FA pin-cycloidal drive. Meanwhile ANSYS is applied to build finite element analysis model, and the finite element contact analysis results coincide with the rigidity analysis theory, which confirms the correctness of the machine rigid mathematical model.
Microwave Curing of Non-Traditional Polymer Materials Used in Manufacture of Injection Moulds
Authors: Yarlagadda Prasad K.D.V. , Poh Andre , Hsu Shu Hau
Published: September 2011

Microwave heating technology is a cost-effective alternative way for heating and curing of used in polymer processing of various alternate materials. The work presented in this paper addresses the attempts made by the authors to study the glass transition temperature and curing of materials such as casting resins R2512, R2515 and laminating resin GPR 2516 in combination with two hardeners ADH 2403 and ADH 2409. The magnetron microwave generator used in this research is operating at a frequency of 2.45 GHz with a hollow rectangular waveguide. During this investigation it has been noted that microwave heated mould materials resulted with higher glass transition temperatures and better microstructure. It also noted that Microwave curing resulted in a shorter curing time to reach the maximum percentage cure. From this study it can be concluded that microwave technology can be efficiently and effectively used to cure new generation alternate polymer materials for manufacture of injection moulds in a rapid and efficient manner. Microwave curing resulted in a shorter curing time to reach the maximum percentage cure.
The Optimization of Curve Based on Genetic Algorithm and Energy Method
Authors: He Gang , Pan Zheng Yu , Zhu Deng Lin
Published: September 2011

An optimization method based on genetic algorithm and energy method is presented to construct a fairing curve network from unconnected sectional curves. The curve’s quality is evaluated by its energy. The parameters of the intersecting points on existing curves are adopted as variable and genetic algorithm is used to optimize the energy of curve based on multi-parent crossover operator. The examples show that the interpolated surface of optimized curve network has good quality than other methods, which proves our method actually improves curve networks’ quality.
Simulation Study on Tractor’s Same-Rut-Steering Mechanism
Authors: Zhao Ren Cai , Ma Xu , Qi Long , Li Rui Chuan
Published: September 2011

When tractor steers in the same rut, it can not only improve its flexibility in steering, but also reduce soil compaction and crop rolling. In this paper , the concept of tractor steering in the same rut was proposed on the basis of four-wheel-steering (4WS) theory, and the angle relationship between front wheel and rear wheel, which can achieve the same-rut-steering, was established. A three dimensional parameterized model of tractor’s same-rut-steering mechanism was established by the Pro/E software, and its running tracks were simulated in the ADAMS environment. Simulation results show that the same-rut-steering accuracy was affected to some extent when tractor’s speed or steering wheel deflection rate was changed. At last, methods for improving the same-rut-steering accuracy were put forward.
Image Registration Based on Mutual Information and Corner Points
Authors: Cheng You E , Qian Yue Jing
Published: September 2011

A maximization of mutual information based image registration method is described. Firstly Due to the inferiority of image registration using maximum mutual information, the registration based on local curvature maximum to obtain corner points. Secondly, the one to one matching points could be obtained through mutual information rough match. Finally, the search strategy used the improved genetic algorithm to find the optimum value. Experimental results indicate the proposed algorithm can achieve better accuracy and good robust.
Simulation of Multi-Port Gear Pump Based on Virtual Prototyping
Authors: Yu Xiao Yang , Sun Li
Published: September 2011

In order to reduce the development cycle and improve the design quality of multi-port pump, the virtual prototyping of multi-port pump is built by the function of three-dimensional modeling and virtual assembly of PRO/E, and pump flow status is simulated by FLUENT software, using dynamic grids technology. The simulation results show that: With the change of pressure difference between inlet and outlet, the dynamical characteristics of flow field is different. Meanwhile the pressure difference between inlets and outlet should be reduced in order to improve the performance of gear bump and increase the service life.
Concept Optimization Model with Multilevel Hierarchy Based on Fuzzy Neural Network
Authors: Bo Rui Feng
Published: September 2011

To implement optimization for mechanical concepts acquired by function analysis more effectively, BP neural network is adopted to structure multilevel evaluation model, which capitalizes on the features of nonlinearity, self-organization, and fault tolerance of neural network. By using appropriate data sets to train the neural network, expertise is acquired and expressed using a trained weight and threshold matrix. Once evaluation objectives of each candidate are fuzzily quantified, converted into evaluation attribute value, and fed into the trained network model, the optimal concept can be obtained. During the process, neural network is used to solve the bottle-neck problem of knowledge acquisition and expression and can be viewed as knowledge base and reasoning engine for the optimization. Hence the proposed evaluation model can effectively deal with concept evaluation and optimization problem with multilevel objective system.
Computer-Aided Monte Carlo Aircraft Tolerance Design Based on UG
Authors: Guo Chang Hong , Xi Ping , Wang Zhen Yu , Li Xing Dong
Published: September 2011

Along with the CAD technology being popularized, three-dimensional design of aircraft is ultimately realized into digital design. However, aircraft tolerances have not been designed by computer. They are mainly based on lots of manual calculations and not coordinated with integrated design and hold back the development of aircraft digital design and manufacture technologies. This paper introduces how to develop computer-aided aircraft tolerance analysis and distribution modules on UG and introduces Monte Carlo tolerance analysis technology. Running instances of aircraft tolerance design are illustrated in the paper.
A Golf Head CAD/KBE Optimization Design System
Authors: Hsu Yung Yuan
Published: September 2011

The purpose of this study was to construct a knowledge-based CAD/KBE system for the optimal design of golf heads. The inability of conventional CAD systems to identify existing knowledge during design and manufacturing processes is a current development bottleneck. Therefore, this study attempted to effectively introduce and integrate KBE technology into a CAD system, so as to achieve the objective of knowledge driven automation (KDA). This study selected golf iron heads with a complex-design surface as the research subject, adopted commercial CAD software (UG/NX) and its secondary development environment as a platform and applied perturbation vectors in the control of NURBS free-form surfaces. We changed the CAD’s entity shapes and physical properties, integrated the optimal principle of design with a CAD solid model, to automatically drive the CAD solid model of golf iron heads according to the design objectives, and constructed a knowledge-based optimal CAD design technology.
Dynamic Stress Analysis of the Globidal Cam Mechanism during Engagement
Authors: Ren Ai Hua , Gong Qing Shan , Chang Zhi Bin , Zheng Fang Yan
Published: September 2011

Firstly the required dimensions and parameters of globidal cam during three dimensional modeling can be determined with Mathcad programming, and the Mathcad file and features of Pro/E part are correlated to realize solid modeling, then the finite element model of the mechanism during engagement is set up with ANSYS, at last the corresponding results are analyzed.
Study and Implementation of the Computer Aided Design System of the Rolling Bearing
Authors: Huang Jing Jing , Li Jian Xia
Published: September 2011

The rolling bearing is a kind of common standard parts. The developing method of CAD system of the rolling bearing based on Solid Edge which is used VB as the developing tool is introduced in this paper. This system can realize the design and check of the rolling bearing automatically, realize the integration of the design and drawing, and improve the design quality and efficiency.
Effects of Additives on Performance of Sintering and Antioxidation of Zr(Ca)-Al-O-N Composites
Authors: Wang Rong Lin , Bu Jing Long , Wang Zhi Fa , Yu Li Xue
Published: September 2011

Influencing effects of additives CaF2, ZrB2 and MoSi2 on sintering performance and oxidation resistance of Zr-Al-O-N composites were investigated. The results showed that additives CaF2, ZrB2 and MoSi2 were beneficial to improve sintering density of Zr(Ca)-Al-O-N composites, and additives CaF2 and ZrB2 were beneficial to improve obviously bending strength of samples Zr(Ca)-Al-O-N composites and MoSi2 was contrary. After additives CaF2, ZrB2 and MoSi2 were introduced to Zr(Ca)-Al-O-N composites, oxidation resistance of Zr(Ca)-Al-O-N composites was improved, and relative superior or inferior of influence ranking of additives was MoSi2, CaF2, and ZrB2.
Synthesis and Characterization of Coral-Like Micronano-SiO2
Authors: Ding Yan Hong , Yang Yang , Tang Yuan Hong
Published: September 2011

Coral-like micro/nano-SiO2 with porous coral-like and coral-like reefs ( consisting of soft coral-like, hard coral-like and branch coral-like) morphologies were synthesized by using the hydrothermal method without any metallic catalysts. The morphologies of coral-like micro/nano-SiO2 are dependent on process parameters so that coral-like micro/nano-SiO2 formed in different process parameters has different morphologies. These morphologies have fractal feature. The possible growth mechanisms are discussed.
First-Principles Studies on the Component Dependences of High-Entropy Alloys
Authors: Wang Shao Qing , Ye Heng Qiang
Published: September 2011

An elabrate study on the structrural and mechanical properties of the five-element FeNiCrCuCo high-entropy alloys is carried out by first-principles calculation within the density-functional theory. The combination application of plane-wave pseudopotentials and alchemical pseudoatom methods is realized to imitate the random elemental lattice occupation in the alloys. The dependence of composition variation to the crystallographic and thermodynamic properties of FeNiCrCuCo alloys in simple BCC and FCC lattices are investigated. The key role of chromium in strengthening the inter-atomic cohesion and stabilizing the lattice structure of HEAs is suggested.
Preparation and Characterization of Biocompatible Magnetic Fluids
Authors: Ji Ye , Shao Hui Ping , Guo Zhi Meng , Yang Dong Hua , Liu Xiao Ting
Published: September 2011

Nano-Fe3O4magnetic particles were prepared by ultrasonic emulsion method and then were dispersed into water with chitosan or folate as surfactants for biocompatible water-based Fe3O4magnetic fluid. The cubic inverse spinel structure of Fe3O4nanoparticles were analyzed by X-ray diffraction technique (XRD). The saturation magnetizations of different magnetic particles were tested by a vibrating sample magnetometer (VSM). The morphologies of nanoparticles were observed by transmission electron microscope (TEM). The particle size was about uniform 10-20 nm, and their shape was approximately spherical. Meanwhile, dispersity was improved markedly after the surface modification. Comparing to magnetic fluid with chitosan modification, magnetic fluid was coated with chitosan and folate gets higher dispersity and stability when both of them have same saturation magnetizations.
Design and Theoretical Analysis of Acoustic Enclosure for G12V190 Type Diesel Engine
Authors: Ma Jin Sheng , Dai Na Na , Bo Yang , Zhou Ling , Liu Zi Feng , Dang Zhi Quan , Zhuang Da Min , Xia Zheng
Published: September 2011

The existing acoustic cover is improved to reduce the noise of G12V190 type diesel engine. A panel of shutters structure is designed and simulated with SYSNOISE. The structure of acoustic enclosure is also been designed according to the structure of the diesel engine. Theoretical calculation shows that the improved insulation cover has not only a good noise reduction effect, but also has been greatly improved in terms of cooling ventilation, the field test results also shows that this section of acoustic enclosure can reduce the noise about 10dB.
Configuration Optimization and Static Analysis of Adjusting Parallel Mechanism for the Sub-Reflector of Antenna
Authors: Hou Yu Lei , Duan Yan Bin , Yao Jian Tao , Zeng Da Xing , Zhao Yong Sheng
Published: September 2011

For the real-time pose adjustment of the sub-reflector of antenna to ensure its best condition, Stewart platform-based mechanism is adopted. This paper presents the configuration optimization of the adjusting parallel mechanism taking the minimum force acted on each limb as the target, and the basic structural parameters of the mechanism are obtained. Considering the weight of the moving platform, the external load, and the influence of the snow and the wind, the maximum force acted on the limbs of the mechanism in the required workspace is calculated, which established the foundation for the structural design of the mechanism. The contents of this paper possess theoretical significance and engineering value for the development of the adjusting mechanism for the sub-reflector of antenna.
Stability and Natural Characteristics of a Supported Beam
Authors: Jin Ji Duo , Yang Xiao Dong , Zhang Yu Fei
Published: September 2011

The stability, natural characteristics and critical axial force of a supported beam are analyzed. The both ends of the beam are held by the pinned supports with rotational spring constraints. The eigenvalue problem of the beam with these boundary conditions is investigated firstly, and then, the stability of the beam is analyzed using the derived eigenfuntions. According to the analytical expression obtained, the effect of the spring constants on the critical values of the axial force is discussed.
The Strength Analysis of Rotor Sleeve and PM for High-Speed Electrical Machine
Authors: Ding Hong Chang , Xiao Lin Jing
Published: September 2011

For high-speed permanent magnet (PM) electrical machine, the PM material has very small tensile stress, and it can’t withstand the huge centrifugal force. So, a high-strength sleeve with interference fit is necessary to protect the PM. This paper mainly analyzes the strength of rotor sleeve and PM. It deduces the theoretical calculation method of the strength according to Lame equation, and it also analyzes the stress of sleeve and PM by ANSYS Workbench. The result show that the theoretical calculation value is closely to the ANSYS result, and it can meet the requirements of protecting the permanent magnet in high rotation speed.
Optimal Design of an in-Plane Traveling Wave Rotary Ultrasonic Motor Excited by Single Composite Transducer
Authors: Qian Fu , Pan Zhen Feng , Jin Jia Mei
Published: September 2011

This paper presents an optimal design for an in-plane traveling wave rotary ultrasonic motor with a composite transducer. The structure of the stator was improved to minimize negative influence on vibration modes from the supporter, and a new stator based on it was designed and fabricated. Two operating modal frequencies of new stator have been adjusted to equality by reducing one structural parameter according to sensitivity analysis. The performance experiments of the prototype motor shows that maximum no-load speed is 450rpm and maximum torque achieves 0.04Nm at an exciting voltage of 200Vrms.
The Optimal Research of Force Increasing Mechanism of Injection Machine based on Genetic Simulated Annealing Algorithms
Authors: Li Tie Jun , Li Xin , Yan Li Qun , Zhu Cheng Shi , Du Yong Ying
Published: September 2011

The analysis of motion and mechanics property has been studied on the five hinged incline arranged and double elbowed force increasing mechanism of injection machine in this paper. An optimization design is proposed on the force increasing mechanism by use of genetic simulated annealing algorithms. A complete procedure of optimal design is introduced so as to increase the stroke ratio and the amplification of the force, and to decrease the total length of mechanism, which belongs to multi-object optimization problem. Compared with the traditional methods, the result shows that the stroke ratio is increased, the amplification of the force is increased and the total length of mechanism is decreased. Moreover a sensitivity analysis of design parameters has been performed to see changes in injection performance parameters, and results show that the length of back elbowed bar and the length of connected bar have a significant impact on the performance measures. And the results recommend that the close clearance of the length of back elbowed bar and the length of connected bar must be maintained.
Researching the Influence of Carton Stiffness on the Hopper Design of Packaging Machine
Authors: Zeng Shan Qi , Cheng Da Yong , Ding Yi
Published: September 2011

Through studying carton stiffness, the hopper design of packaging machine is improved. By using the elastic-plastic theory and finite element stress analysis method, the hopper baffle design of automatic tea packaging machine is optimized in order to reduce the requirements of equipment for paper, solve the problem that automatic packaging machine stop work. At the same time, the stress analysis of carton is taken through the ANSYS to derive that the suction of sucker satisfy the requirements of carton stiffness or not, the carton appear plastic deformation in the force process or not.
Study on Fruits Preservation in View of Surface Glossiness
Authors: Wang Geng Jia , Lv Xin Guang , Kuang Shu Ting , Chen Hui Long , Peng Jing
Published: September 2011

Abstract: Nowadays, there is no low-cost fruit nondestructive testing method in China. The study aims to put forward a method about acquiring the moisture content of fruits indirectly by general photographic equipments. Firstly, general photographic equipment is used to obtain pictures of fruits or vegetables. Secondly, with the help of Matlab and Photoshop, the surface glossiness of the fruit or vegetable is gained. Thirdly, moisture content of a fruit or vegetable is measured through infrared moisture meter. Meanwhile, a Mathematical Model in Regression Analysis between the R value and the moisture content is established. Lastly, the non-linear relation between surface glossiness and moisture content of the fruit is found. Therefore, a new method about measuring the moisture content of fruits or vegetables through general photographic equipments is sought out.
Nucleation Mechanism for Epitaxial Graphene on Si-Terminated SiC (0001) Surfaces
Authors: Liu Qing Bin , Li Jia , Wang Jing Jing , Dun Shao Bo , Feng Zhi Hong
Published: September 2011

The nucleation mechanism during the epitaxial graphene films on Si-terminated SiC (0001) surfaces was investigated by atomic force microscopy (AFM) and Raman scattering spectrum. By imaging the change of Si-terminated SiC substrate surfaces, we observed the process of the initial nucleation and the wrinkle formation of graphene. The nucleation of epitaxial graphene phase initiates at 1450°C and the wrinkle formation depends on the thermal decomposition time.
Study on Stiffness and Damping Characteristic of Hybrid Magnetic Bearing for High-Speed Electrical Machine
Authors: Xiao Lin Jing , Ding Hong Chang
Published: September 2011

This paper focuses on the stiffness and damping characteristic of hybrid magnetic bearing for high-speed electrical machine. Firstly, it analyzes the structure and working principle of hybrid magnetic bearing, according to the bearing’s magnetic circuit properties, it deduces the equation of the bearing’s magnetic force with displacement and current. Then, combining with the controller parameters it deduces the stiffness and damping equation of magnetic bearing. At last it simulates the stiffness and damping characteristic curve, and the obtained simulation results can give theoretical support for rotor dynamic analysis and modal analysis.
CAE Technology Applied to Range Hood’s Noise Control and Optimization Design
Authors: Yu Hu , Hou Hong , Sun Liang
Published: September 2011

In this study we use the CAE technology to compute and reduce the radiated noise of range hood. First, a finite element model of a typical range hood is created using Hypermesh. Then, the surface particle velocity is carried out in Nastran, and the radiated noise is calculated by Sysnoise. Finally, the DOE-based structural optimization is preformed using iSIGHT-FD, in which the sound pressure level at four sensitive points and the radiated sound power are selected as the objective function and the thickness of four panels are adopted as design variable. In addition, the weight of the range hood as a constraint is kept no more than its original weight. As a result, a maximum radiated sound power reduction of 3.66W and a maximum sound pressure level reduction of 4.7 dB are successfully achieved. It shows the CAE technology is a very efficient and effective method for reducing radiated noise.
An Experimental Study of Breathing Mechanism for the Transversely Cracked Shafts
Authors: Wu He Len , Cai Zhong Yi , Xiao Ke Qin
Published: September 2011

Shaft fatigue crack is one of the most common defects in rotating equipment, due to its extensive operation with continuous heavy loads. Finding an efficient way to evaluate the true stiffness variation due to the crack rotation is the key step to develop both on-line and off-line crack diagnostic techniques. This study analyzed time-variant bending stiffness of elastic shafts with experimentally-induced fatigue, welding and wire cut transverse cracks. It was found that crack gap has a significant effect on the opening and closing behaviour of the transverse crack. As in the case of a cut crack, large crack gap could completely prevent the crack from closing during rotation. A fatigue crack without a clear gap shows a typical opening and closing behavior. Further, it remains fully closed within a small angular range and most of time it is partially closed. It was also observed that both switch and harmonic models cannot describe periodic stiffness variation well enough to represent the actual breathing function of the fatigue crack.
Properties of Coconut Fiber/Rubber Cement Board for Building Partitions
Authors: Liu Yu Wen , Pan Huang Hsing , Chang Chao Shun , Pann Kun Sheng
Published: September 2011

Due to recycling of scrapped tire rubbers and coconut fibers, a new building material composited of rubber particles, coconut fibers and cement is applied to building partitions. A lightweight coconut fiber/rubber cement board (LCRCB) consists of rubber/cement board as a sandwich layer and coconut fiber/cement as the matrix, where the sandwich layer containing three fractions of the rubber from 30% to 50%, and the matrix with a constant ratio of 15% coconut fibers in volume. Results show that the measured properties of LCRCB are found with water absorption between 13.8% and 15.4%, unit weight of 1400-1480 kgf/m3, bending strength of 1.97 MPa and coefficients of thermal conductivity in 0.261~0.286 kcal/m•oC•hr,. After the impact test, LCRCBs show no cracks, detachment, pinholes and the split on the impacted surface. Besides, LCRCB satisfies the 2nd degree requirements of incombustibility based on national standards. To be a building partition, LCRCB also shows no smoke toxicity in burning.
Application of the Comprehensive Evaluation Method on Mechanism Scheme of Machining Center
Authors: Liu Jian Hui , Yuan Si Wen , Chang Jia Lin
Published: September 2011

Based on fuzzy mathematics theory, a multi-layer fuzzy comprehensive evaluation system for mechanism schemes of machining center was established using value set instead of fuzzy set, which avoided the problems of constructing membership function, and achieved the quantitative evaluation for mechanism scheme with complex elements preliminarily. The model provided references for the development and establishment of the expert evaluation database system of the mechanism scheme.
Effects of Ultrasonic Vibration on Tribological Properties of GCr15/45# Steel Frictional Pairs in Lubricated Sliding Conditions under Various Friction Speed
Authors: Qiao Yu Lin , Yang Shan Lin , Zang Yan , Dong Xin Yu
Published: September 2011

The effects of friction speed and ultrasonic vibration on friction reduction and anti-wear properties of GCr15/45# steel frictional pairs under oil lubrication were investigated by a modified MFT-R4000 reciprocating friction and wear tester. The mechanism of friction reduction and anti-wear under ultrasonic vibration was discussed. The results showed that, the ultrasonic vibration could influence the friction reduction and anti-wear properties of frictional pairs due to it could reduce the stress between the friction pairs and destroy the oil film on the surface of samples. When the friction frequency was 2Hz，ultrasonic vibration would reduce the friction coefficient and wear volume of the frictional pairs. When the load was 40N, the friction coefficient and wear volume of the frictional pairs attained under ultrasonic vibration decreased 8% and 44% respectively. However, ultrasonic vibration would increase the friction coefficient and wear volume when the friction frequency was 5Hz. When the load was 30N, friction coefficient and wear volume of frictional pairs increased 11% and 74% than that without ultrasonic vibration respectively.
Fabrication of TiAl Alloy Powders by High-Energy Ball Milling and Low Temperature Sintering
Authors: Liu Xiao Ting , Shao Hui Ping , Yang Dong Hua , Guo Zhi Meng , Ji Ye
Published: September 2011

Ti/Al(Ti-50at.%Al) composite powders were prepared by high-energy ball milling followed by reaction sintering heat treatment at 550°C ~ 650°C for 2 hours. Mechanical alloying of TiAl had been performed in a high energy plant ball after different milling times and pre-sintered at different temperatures. The particle sizes of Ti/Al powders were analyzed by scanning electron microscopy (SEM). X-ray diffraction (XRD) analysis was performed for microstructural characterization. The results show that microstructural and morphological changes of high energy milled powder are studied as a function of milling time. Over 600°C TiAl powders are completely alloyed by being sintered at different temperatures. The powders are mainly composed of γ-TiAl as well as a small amount of AlTi3. The TiAl alloy powders of high energy ball mill/2h and sintered at 650°C/2h get plasma spheroidization. Spheroidizing powders with fine texture, γ-TiAl and AlTi3phase, particle size of 10~40μm are obtained.
Development of Nutritionally Enriched Juglans Mandshurica Nut Yoghurt
Authors: Zhao Ruo Shi , Liu Dong Min , Zhang Qi Fei , Bao Yi Hong
Published: September 2011

In this study, we mixed peeled and grinded Juglans mandshurica nuts with milk, using Lactobacillus casei and Streptococcus thermophilus as culture, the ration is 1:1. After fermented, we obtained enriched Juglans mandshurica nut yoghurt. The optimal formula of the yoghurt was determined by the L9 (34) orthogonal test. The best formular was: solid-liquid ratio 1:6, pulp-milk ratio 2:8, and filtered with an 80 mesh sieve. This dairy product contains the nutrients from Juglans mandshurica nuts, fresh milk and probiotics; tastes sour and sweet with a walnut fragrance; and is a kind of functional food with a great economic value and market potential for development.
A New Type of Cylindrical Travelling Wave USM
Authors: Wang Yi , Qin Bo , Wu Mao Chang , Song Jian , Zou Ping , Hu Ming
Published: September 2011

In this paper, a new type of cylindral USM with two stators is researched. There is a brief analysis of the USM design including mechanical structure and driving circuits. Meanwhile the paper also introduces some of the experiment results of the USM tests.
Multi-Process Tools for Fabrication, Assembly and Inspection
Authors: Bi Zhu Ming
Published: September 2011

Multi-process tools play an important role in improving productivity and reduce unit cost of products. In this paper, a comprehensive literature survey on multi-process tools is conducted. The objectives of this survey are to (i) understand key business drivers for multi-processing, (ii) learn the existing multi-process tools available in various applications including automotive, pharmaceutical, and electronics, and (iii) identify trends in development of multi-process tooling. The contributions have been made in the following aspects: (i) the scope and definition of multi-process tools are introduced; existing multi-process tools are classified in terms of the nature of multi-processes, the targeted objects, and the applications. (ii) Pros and cons of multi-process tools are discussed and used as criteria to determine some principals in selecting right applications. (iii) Some under-developing areas related to multi-process tools have been identified and the principals of adapting multi-process tools have been determined.
Research on the Machining Status Monitoring of CNC Machine Tools Based on Artificial Neural Network
Authors: Li Jin Hua , Liu Yong Xian , Yi Deng Li , Zhang De Qiang
Published: September 2011

Vibration acceleration and AE signal were analyzed in the time domain, and they sampled the mean value and mean value of energy. The two values were used as the basis of the state recognition and tool wear prediction. In Labview, the neural network model was established, and it had three-layer structure. the nonlinear mapping was realized between machining state and characteristic quantity. The outcome could show that the machining state was monitored by the neural network training.
Discrete Enterprise Data Acquisition System Based on RFID Technology
Authors: Hu Qing , Qui Yu Ping , Lin Lian Shi
Published: September 2011

Considering the discrete enterprise manufacturing process and the production management problems caused by information and management gaps between enterprise planning and field process control，RFID was introduced into the manufacturing production for discrete enterprise，in which tags were used to track work in process．Proposed an discrete enterprise production process data acquisition system design method based RFID technology. Analysis the data acquisition system basic components of production actual information offered by the system, System structure and major functional modules were characterized by its favorable openness and extensibility．Its application in a discrete enterprise assembly line showed that both production efficiency and quality were greatly improved, this method has broad prospects.
Fault Tolerant Control of Linear Permanent Magnet Synchronous Motor Based on Autonomous Decentralized System
Authors: Hao Shuang Hui , Tang Zi Li , Hao Ming Hui
Published: September 2011

This paper proposes a novel autonomous decentralized system (ADS) for controlling high power LPMSM. The system decentralizes a control system into several subsystems, thus the power supply and power electronic devices of the control system can be replaced by smaller ones, and the better fault tolerance of the system can be obtained. We first study the architecture of the ADS for LPMSM, then study the mathematical model of the LPMSM with decentralized stator coils. Finally, the fault model of the system is analyzed and a fault-tolerance design based on redundancy is proposed. The experimental results show that this method is effective for LPMSM control; excellent current control and fault tolerant feature of the system confirm the validity of the proposed system
Simulation and Experiment of New Longitudinal-Torsional Composite Ultrasonic Elliptical Vibrator
Authors: Yin Zhen , Li Hua , Cao Zi Yang , Xie Ou , Li Yan
Published: September 2011

A new ultrasonic elliptic vibrator design method was proposed, the ultrasonic elliptic vibration was achieved by the structural curve of the longitudinal and torsional vibrations. The model, harmonic and transient analyses of the new longitudinal-torsional composite ultrasonic elliptical vibrator were performed by using the software ANSYS, the prototype of the new vibrator was tested by using impedance analyzer and PSV-400 laser Doppler vibrometer, the correctness of the finite element simulation results and the feasibility of the new longitudinal-torsional composite ultrasonic elliptical vibrator design methods were verified.
Innovation Design of Children Electronic Painting Tools
Authors: Wang Yong , Ding Wen Jiao , Xu Xiao Meng
Published: September 2011

Painting education is one of the main intellectual development forms for early childhood, and the valuable experience in children healthy growth. This paper analyses the demand and psychophysical characteristics of 3-12 years old children, and proposes the design basis of children electronic painting tools. The main design points of children painting tools are summarized by means of integrating the design principles, which include production interestingness, function promotion, man-machine interactivity and handleability. Aim at satisfy the design idea for children painting tools, a series of innovation designs is developed in several acpects such as shape, color, function, use pattern and man-machine interaction.
Study on Rotor’s Tooth Profiles of Double Enveloping Cycloid Pump
Authors: Li Chao Yang , Chen Bing Kui
Published: September 2011

Abstract This paper proposes a new type of internal meshing cycloid rotor pump-Double enveloping cycloid pump. It is characterized by double contact lines between the inner and the outer rotor so that it has outstanding advantages, such as better sealing capacity, higher outlet pressure and volumetric efficiency etc. Based on the brief introduction of the equations of the inner and the outer rotors’ tooth profile, the composition and characteristics of the outer rotor’s tooth profile for the double enveloping cycloid pump are discussed in detail, the calculation method of the normal meshing clearance between the outer rotor and the modified inner rotor is introduced, and the calculation example is given. Result shows that the works in this paper will help to design the new type cycloid rotor pump with high performance.
Research of the Pilot Operated Relief Valve for MRF System
Authors: Wu Xi , Wu Zhang Yong , Wang Xian , Wang Jing Tao , Wen Cheng Zhuo , Wang Qing Hui
Published: September 2011

Combining with the rheological characteristics of MRF and the traditional structure of pilot operated relief valve, the key technical problems existing in this type of valve when using MRF instead of mineral oil were analysed. To solve its key technical problems, A novel pilot operated relief valve for MRF system has been designed. Adopting MRF valve for using the pilot valve, designing reasonably the relative position and the size of the working gap in the MRF valve, and optimizing design the structure of the main valve of the pilot operated relief valve for MRF system, can effectively improve the damping force of the MRF valve and reduce the erosion and noise of the pilot operated relief valve for MRF system.
Research on Structural Optimization of Oil Bit Screw Thread
Authors: Li Bin , Wang Xia
Published: September 2011

Abstract: With the development of drilling technology and demand, the working environment of oil bit with bearing a greater load has become increasingly harsh, which lead to occur frequently fracture on oil bit screw thread. In this paper，optimization research on oil bit screw thread is mainly presented, along with improvement scheme of structure from five aspects, and taking API 7 5 / 8 "REG (V-050) as an example, design on structure optimization of oil bit screw thread is completed so as to enhance structural strength of oil bit screw thread, thus reducing or even avoiding the occurrence of screw thread fracture of oil bit and meeting the demand for field use.
The Design and Experimental Study of Automatic Backwash Fiber Bundle Filter
Authors: Zhou Yang Min , Li Chao , Xu Li Li , Luo Si Yi , Yi Chui Jie
Published: September 2011

A kind of automatic backwash fiber bundle filter which is used for filtering the washing BFS water is designed and its properties have been studied. The high density particles in washing BFS water and suspended slag wool are the key factors for the filtering effect. By optimization design of structure, the filter has properties of big particles precipitation, automatic discharge of floating sludge and fixed pressure backwash. Through experimental tests, the results show that: the high density particles precipitation and filter layer regeneration rate are quicker; the ability of automatic discharge floating sludge is higher. Compared with the traditional fiber filters, this kind filter efficiency of this kind filters increases 15%.
The Development of Automatic Switch Jet Element
Authors: Xiong Qing Shan , Kong Fan Jiu , Li Jia , Liu Shuang Liang , Ye Yong Sheng
Published: September 2011

Automatic switch jet element had many advantages and could be applied to lots of fields. Therefore, it was necessary to develop it. In order to research influence law of structural parameters to automatic switch performance, lots of experiments was done by changing split shape, split height, nozzle width and depth of traditional jet element. The jet could switch automatically when split shape was concave, split height was less and ratio of depth to width was larger. Automatic switch jet element was designed based on influence law of structural parameters to jet switch. The groove on the element sidewall, which was connected with the signal channel, was processed to break the swirl from the element work room and this was beneficial to realizing automatic switch. In addition, automatic switch would not achieve until the jet in the signal channel and controllable path was enough. For some jet element, automatic switch would be easier to realize when the flow became larger.
Research and Development of the Hydraulic Cylinder Control System on FIX
Authors: Wang Chun Mei , Li Hong , Zhou Shi Qiang , Xie Chun Hua
Published: September 2011

In this article, making use of FIX industrial control soft, introduce the test principle signal data processing and property analyzing of the hydraulic cylinder by the help of the computer.It has greatly enhanced the speed and accuracy of detection for hydraulic components and hydraulic system, and also given a promise to assure the design and maintenance successfully.
Simulation Study of Air Entrapment of Melt Flow inside the Shot Sleeve in Die Casting Processes
Authors: Dou Sha Sha
Published: September 2011

Based on FLOW3D software to study on the air entrapment of melt flow inside the Show Sleeve in Die-Casting processes, the effect of Die-Casting parameters which are diameter of sleeve, filling rate, low velocity of the plunge, find out the corresponding regression Equation, best parameters and simplified formula of the plunge velocity.
The Steady State Rheological Behavior of Semisolid AlSi6Mg2 Alloy
Authors: Luo Hong Chao , Chen Shi Pu , Nie Qin , Xu En Sheng , Ju Li Ping
Published: September 2011

In the present work, basing on the rheological model of Chen and Fan (CF) [1] of semisolid metal slurries (SSMS), the rheological behavior at steady state of AlSi6Mg2 alloy is investigated. Experimental results on steady state viscosity of the present system in the literature are used to determine the parameters of the CF model by fitting. It has been shown that the steady state viscosity and the average agglomerate size increase with increasing the solid volume fraction and decreasing the shear rate. The theoretical prediction of the CF model is in good agreement with the experimental results in the literatures quantitatively. The importance of the effective solid volume fraction is shown by explaining the strong coupling between the viscosity and the microstructure. Specifically, the external flow conditions such as shear rate influences the viscosity by changing the agglomeration degree of the solid particles, that is, the effective solid volume fraction and then changing the viscosity.
Design and Analysis of 7-DOF Fiber Placement Machine
Authors: Xun Da Wei , Luo Chang Jie , He Kai , Du Ru Xu
Published: September 2011

This paper presents a 7-DOF (Degree Of Freedom) fiber placement machine. The fiber placement machine is designed through modular method and function analysis. The machine consists of three major parts: manipulator, spindle and creel cabinet, which has seven axes in total. The three rotating axes intersect in a vertex and three shifting axes of the manipulator are orthogonal. The style of wrist is orthogonal spherical wrist and it can achieve yawing, pitching and rolling motion. The placement head is mounted on the end of manipulator, including guide module, clamp module, restart module, cut module, compaction module, collection module and heat module, which can achieve independent control of tows clamp, restart and cut. The creel cabinet has the function of tension control.