bluuebunny/crossref_metadata_2025 huggingface dataset:
Cylindrical Cavitation in a Class of Compressible Hyper-Elastic Materials
Authors: Deng Hong Mei , Yuan Xue Gang , Niu Da Tian
Published: March 2011

The finite deformation about the radial direction is examined for a solid cylinder composed of a class of compressible hyper-elastic materials. Some interesting conclusions are proposed by using the theoretical solutions and the numerical simulations. There exists a critical stretch such that the cylinder would remain a solid one if the radial stretch does not exceed the critical value and that a cylindrical cavity would form at the axial line of the cylinder if the radial stretch exceeds the critical value. The phenomena of concentration and catastrophe of radial and circumferential stresses further show that cavitation in compressible hyper-elastic cylinder coincides with the actual physical grounds.
Experimental Research on Complementary Welding of Simulating Pit for Pressure Hull
Authors: Zhao Cun Sheng , Zhu Shi Jian , Wang Lu
Published: March 2011

A pit with dimension 200mm×160mm×21mm is digged in the middle of steel plate using carbon-arc air gouging. The pit was polished and welded using CW66J welding rod. Built-in stress, toughness and rigidity was tested to validate the validity.
Microstructure and Mechanical Properties of κ-Al2O3/TiCN Coating Prepared by CVD
Authors: Qi Zheng Bing , Sun Peng , Wang Zhou Cheng , Wu Chong Hu
Published: March 2011

The κ-Al2O3/TiCN multilayer coatings have been deposited on cemented carbide cutting tools using chemical vapor deposition (CVD). The morphology of the surface and cross-section were examined by scanning electron microscope (SEM). The adhesion force and scratch resistance of κ-Al2O3/TiCN coating were determined by CSM scratch tester. The results showed that the etching reagents and etching times had an evident influence on the morphology of the cross-section of κ-Al2O3/TiCN coating. The surface of κ-Al2O3/TiCN coating exhibited hexagon grain structure. The κ-Al2O3 layer showed columnar structure while the TiCN layer exhibited fibrous structure with long-needle grains. The results of scratch testing indicated that the -Al2O3/TiCN coating failed at coating/substrate and layer/layer interface by delaminating rather than by cracking or chipping due to long needle-like and columnar structure.
New Uplink Initial Ranging Scheme for IEEE 802.16e OFDMA Systems
Authors: Chen Chien Sheng , Liu Wen Hsiung , Shou He Nian , Ho Yu Jen
Published: March 2011

Ranging is one of the most important processes in the uplink of the IEEE 802.16e OFDMA system. A ranging process includes the initial ranging, periodic ranging, handover ranging, and the contention bandwidth request. Initial ranging provides network entry, uplink synchronization, and system coordination. In the initial state of the transmission process, multiple users randomly transmit selected ranging code sets and BS identifies a specific user using the ranging code identification and uplink synchronization using the transmission delay estimation. In this paper, we discuss the details of the initial ranging and propose an algorithm to carry out a successful ranging process. The performance results and the comparison of computational complexity with the traditional method are also presented. It is noted the proposed algorithm can offer a better trade-off between computational complexity and performance.
A Study of Thermal Stability and Electromaganetic Shielding Behavior of Polyaniline-P-Toluene Sulfonic Acid/Montmorillonite Nanocomposites
Authors: Chang Ming Kuen , Hsieh Hsin Hong , Li Siou Jyuan
Published: March 2011

Intrinsically conductive polymer-Polyaniline had high conductivity and many other properties, such as environmental stability and rather simple synthesis. In addition, doping with organic acids could enhance its processing, so it had wide range of applications, such as solar cells, antistatic and electromagnetic interference shielding. In this study, the organic amine 1-Dodecylamine (DOA) modification of sodium montmorillonite (NA+-MMT), and conducting polymer / layered silicate salt nanocomposites (PANI-PTSA/DOA-MMT) had been prepared by doping aniline with organic acid (PTSA), then added organic clay. The thermal, electrical properties and EMI effects of nanocomposites had discussed by XRD, TEM, EMI, TGA analysis, conduction measure and EMI tested. The results indicated the organo-clay interlayer distance expanded from 1.29 to 1.8 nm, and DOA-MMT dispersed in the material, that formed an exfoliated nanocomposite. The thermal stability of nanocomposites depended on content of DOA-MMT, material had the better thermal stability when DOA-MMT load was 5 wt. %. The nanocomposites had the best conductivity when DOA-MMT load was 1 wt. % as well as the electromagnetic shielding effectiveness was increase with increase in conductivity. In addition, the electromagnetic shielding of nanocomposites also depended on thickness and frequency of electromagnetic wave, the electromagnetic shielding was increased with increase in thickness and frequency.
A Multi-Level Matching Filtering Algorithm Based on Similarity
Authors: Chen Wen Yu , Zeng Ru , Zhang Zhong Quan
Published: March 2011

A similarity-based filtering algorithm is proposed for multi-level matching. The algorithm consider all elements like service name, description information, input and output, reputation and effects respectively, cosine theorem and semantic distance are given in this paper to calculate their similarity. The aspects of the algorithm are as follows. It achieves a more comprehensive metrical scheme on the similarity between publishing service and request service from multiple stages and multiple perspectives in web service matching process. It judges whether the service preconditions match the effects based on description logic. Finally, it introduces reputation metrical scheme .In addition, the qualitative and quantitative analysis of the algorithm are given in this paper. The analysis results show that the Multi-level Matching Filtering Algorithm can obviously improve the recall ratio and precision ratio of Web service discovery.
A Solution Method for an Optimal Controlled Vibrating Circle Shell by Measure and Classical Trajectory
Authors: Fakharzadeh J.A. , Jafarpoor F.N.
Published: March 2011

The mean idea of this paper is to present a new combinatorial solution technique for the controlled vibrating circle shell systems. Based on the classical results of the wave equations on circle domains, the trajectory is considered as a finite trigonometric series with unknown coefficients in polar coordinates. Then, the problem is transferred to one in which its unknowns are a positive Radon measure and some positive coefficients. Extending the underlying space helps us to prove the existence of the solution. By using the density properties and some approximation schemes, the problem is deformed into a finite linear programming and the nearly optimal trajectory and control are identified simultaneously. A numerical example is also given.
A Multicriteria Decision Method with Uncertain Information in Financial Credit Loan Decision-Making
Authors: Liang Liang , Jiang Ren Yan , Liang Yin
Published: March 2011

It is difficult to obtain the correct criteria weights with uncertain information in the multicriteria decision-making. Many methods depend on the subjective estimate. Therefore, a method is presented to evaluate the samples ranking only need the importance order of criteria. It evaluates firstly the overall ranking scores of samples based on the graphical classification and multicriteria hierarchical integrated methods. Subsequently, the relation model between the criteria scores and overall ranking scores of samples is built by linear regression. Finally, a fincial credit loan decision-making problem is presented to describe the way of the multicriteria decisiion making process. The analysis to compare with the AHP method illustrates the proposed method is objective and effective.
Effect of Stand-Off Distance on Impact Pressure of High-Speed Water Jet Injected in Water
Authors: Matthujak Anirut , Kasamnimitporn Chaidet , Sittiwong Wuttichai , Pianthong Kulachate
Published: March 2011

This study is to measure the impact pressure of high-speed water jet injected in water at the stand-off distance from the nozzle exit. The high-speed water jets are generated by the impact of a projectile, which known as impact acceleration method, launched by Horizontal Single Stage Power Gun. The maximum averaged jet velocity of about 374.24 m/s in water was generated in this experiment. The impact pressure of high-speed water jet in water at the stand-off distance 15, 20, 30 and 40 mm from the nozzle exit was measured by the PVDF pressure sensor. Moreover, the impact phenomena of the jet were visualized by a high-speed video camera with shadowgraph optical arrangement. From the pressure sensor, two peak over-pressures are always observed in this experiment. From visualization, it was found that the two peak over-pressures of 24 GPa and 35 GPa at x = 15 mm were generated by the jet and the bubble impact, respectively. The peak over-pressure decreases exponentially as the stand-off distance between the PVDF pressure sensor to the nozzle exit increases. Moreover, the jet and the bubble impact on the PVDF pressure sensor, shock waves, and bubble deformation were obviously observed in this study.
Investigation on the Absorption Enhancement Mechanism of Aqueous LiBr Using Surface-Active Agent
Authors: Guo Yun
Published: March 2011

The paper focuses on the enhancement of heat and mass transfer by adding active agent to lithium bromide aqueous solution. Through absorption experiments with local optical measurement, the qualitative analysis of the causes of the absorption enhancement with the surface-active agent is carried out with a view to further understand the absorption enhancement mechanism of surface-active agent. It is concluded that the Maragoni instability is mainly responsible for enhanced mixing, thereby enhancing absorption.
Research for Density Design of Diamond Bit
Authors: Yang Jun De , Wang Yuan
Published: March 2011

Based on mass experiments, gain the relation between the consistence of diamond bit and life, power consumption and granularity. Considering the relation of them, deduce a new method of calcuation for consistence design of diamond bit according to the given depth map of incising rock with diamond. Proved by practice, the method of calculation has a better practicability and veracity.
Research of Selecting Diamond Quality in Diamond Bit
Authors: Yang Jun De , Wang Yuan
Published: March 2011

By analyzing the rock fragmentation mechanism of diamond in diamond bit, the rock cutting depth with diamond, the area of diamond pressing into rock, the load on each diamond and the pressure on rock from diamond are calculated. After analyzing the result of calculation, it comes to a conclusion that volume crushing contributes most in rock fragmentation process of diamond bit. The method of choosing diamond quality in diamond bit is also explained as well. Selecting the quality of diamond plays a vital role in product performance. The effectiveness of diamond bit is involved with not only the density and particle size of diamond, but also the quality of diamond. Based on analyzing the rock fragmentation mechanism of diamond, this paper researches on selecting diamond quality.
Effects of Cure Temperature on Corrosion Property of Vinyltriethoxysilane Films on Carbon Steel Surfaces
Authors: Zhang Xu Ming , Wang Jian Jun , Liu Chun Ming , Ying Yue Jun
Published: March 2011

Silane treatment has been applied as a chromium free multi-metal surface treatment for its characteristics of corrosion protection, adhesion promotion and metal surface passivation. Vinyltriethoxysilane(VTES) hydrolysis solutions with the concentration of 4% and 10% were prepared, respectively. Morphologies and microstructures of the VTES films both before and after the corrosion test were observed with a scanning electron microscope (SEM), and effect of cure temperature on the corrosion resistance of silane film was studied combined with electrochemical impedance spectroscopy (EIS). The results showed that the cure temperature affects condensation states of silanol groups –Si–OH in silane films and promotes the forming of –Si–O–Si– network structure, and as a consequence influences the corrosion resistance of VTES films.
Multidisciplinary Optimization Method about the Thickness of Engine Hood Based on Pedestrian Protection
Authors: Ye Hui , Hu Ping , Che Chao Jie , Lu Fan
Published: March 2011

A multidisciplinary optimization method about the thickness of engine hood based on pedestrian protection was proposed. The impacting zones of engine hood where HIC values of original engine hood were higher than the safety value of 1000 were selected as the cases of optimization. At the same time, the stiffness of torsion of engine hood and the deformation distance between the hood and the underneath hard parts in the engine bay were taken into account. The objective was the minimization of hood deformation above where the hard parts were located. The first type of constraint was that the HIC values were less than the safety value 1000 in the selected cases of optimization. The second type of constraint was that the torsion stiffness of engine hood was higher than that of the regulation. The pedestrian protection optimization model about the thickness of engine hood was constructed and solved. The results of optimization indicated that the obtained thickness by this method improved the performance of pedestrian protection.
Determination on Slub Length for Slubby Yarn of Ring Bobbin
Authors: Liang Jun , Luo Jun
Published: March 2011

High-precision slub yarn can be produced by EJM128K type ring bobbin equipped with servo control system which has the characteristic of stability ,precision and rapidity to control slub length by analyzing the transfer function of it. The length of slub yarns was tested with USTER® TESTER5, and the distribution curve of slub length and slub space can be attained. The gauge of between front and middle roller affects slub length deflection. This result can control effectively slub length and produce high-class slub yarn.
A Brief Survey on Artificial Intelligence Methods in Synchronous Motor Control
Authors: Hoo Choon Lih , Haris Sallehuddin Mohamed
Published: March 2011

Many industrial applications require efficient servo drives and speed control to obtain the necessary performance with respect to different applications. As time passes, artificial intelligence has grown and replaced many traditional control methods in order to attain greater robustness to uncertainties, faster dynamic response and smaller position and speed errors. This paper briefly reviews several artificial intelligence implementations in synchronous motor control systems and briefly indicates the advantages and disadvantages of each method.
Experimental Investigation on the Polypropylene Fiber Concrete Performance of Yellow River Canal Lining in the Middle Line of South-to-North Water Transfer Project
Authors: Fang Hou Guo , Liu Ping Hui , Zhang Tao
Published: March 2011

In order to meet the running needs of the first-stage construction in the middle line of South-to-North Water Transfer Project, the canal lining of both sides of Yellow River Tunnels Project need the use of mechanized equipment construction in order to improve the quality and efficiency of lining construction, there is a need to study the feasibility of the use of polypropylene fiber concrete instead of reinforced concrete in canal lining. This paper analyzes the effect of polypropylene fiber on concrete shrinkage and crack resistance. The results show that all three polypropylene fibers have properties of a low density and high elongation, the dispersivity test results show that dispersivity is better when stirring fiber A after a certain period of time. After the incorporation of polypropylene fibers, the concrete splitting tensile strength is significantly increased, altogether with ultimate tensile value and frost resistance. The incorporation of polypropylene fibers increases the tensile strength of concrete and improve the toughness of it. Compared with standard concrete, the early shrinkage of polypropylene fiber concrete is significantly lower, the incorporation of polypropylene fibers can take the place of steel mesh in concrete cracking, especially in the early control of concrete cracks, it can effectively prevent and suppress the cracks formation and development. This paper recommends the concrete proportioning parameters meeting the requirements of canal lining concrete technology and construction.
Analysis and Optimization of an Electromagnetic Drive Dispenser
Authors: Deng Gui Ling , Peng Zhi Yong
Published: March 2011

Adhesive jet dispensing is widely used in many applications. To achieve nano, precise and efficient dispensing, an electromagnetic drive dispenser is proposed. In this paper, the characteristics of a sample electromagnetic drive dispenser are measured and analyzed. According to the specialties of the sample dispenser, several improved suggestions are given, and the improved results are verified by a simulation model.
Modeling and Simulation of a Jet Dispenser Based on GMA
Authors: Deng Gui Ling , Chen Jin
Published: March 2011

This paper introduces the structure and working principle of a jet dispenser based on giant magnetostrictive actuator(GMA), builds the mathematics and simulation model of the jet dispenser, researches its dynamic characteristics and analyses the simulation results. The simulation results show that the needle displacement, needle velocity and accumulated fluid volume are consistent with actual situation. It demonstrates that the model can correctly reflect the dispenser's dynamic characteristics.
The Identification Technology of Rolling Bearing Acoustic Emission Fault Pattern Based on Redundant Lifting Wavelet Packet and SVM
Authors: Gao Li Xin , Zhai Fen Lou , Hu Bang Xi , Zhou Jiang Hua , Chen Jian Hua , Xiao Yong Gang
Published: March 2011

As the energy distribution in each frequency band of rolling bearing acoustic emission (AE) signal is related to its fault type, so we can use the redundant lifting wavelet packet to decompose the rolling bearing AE signal of different fault into different frequency band, combine energy in each frequency band together to be a feature vector of the Support Vector Machines (SVM), then being applied to identify the fault through SVM. This paper also compared the redundant lifting wavelet packet and Daubechies wavelet packet as well as the SVM and neural networks. The experimental result shows that for the fault pattern identification, the method that combines redundant lifting wavelet packet decomposition and SVM together can be effective.
Increasing Cryogenic Strength of Epoxy Resin Modified by Reactive Macroglycol
Authors: Yao Da Hu , Zhang Yu Qing , Lee Joong Hee
Published: March 2011

A bisphenol-A glycidol ether epoxy resin was toughened in cryogenic temperature using reactive macroglycol as modifiers. The properties of modified epoxy resin were characterized by SEM and DMA. Phase-separated structure formed during curing process in the PPG and PTMG modified epoxy resins system, and did not occurred in the PEO modified epoxy resins system. The impact strength of epoxy resin increased at both room temperature (RT) and cryogenic temperature (CT, 77 K) using PEO as modifier. The DMA results confirm that the introduction of PEO chains in the structure of the epoxy increases the mobility of the molecular segment of epoxy network at both RT and CT.
Comparison of 3D Carbon/Carbon Composites with Respect to Interfacial Properties
Authors: Wei Li Ming , Meng Song He , Xu Cheng Hai
Published: March 2011

Most of fracture processes of carbon/carbon composites (C/Cs) have been found to profoundly affected by their interfacial properties. A fiber-bundle pull-out test is utilized to determine the interface strength between fiber bundles and matrix of two kinds of C/Cs. Pre-fracture observations revealed that amount of voids and gaps existed in the interface, which make the interface strength decreases. The interfacial shear strengths of two kinds of C/Cs were all very low. Post-fracture observations revealed that a shear fracture was successfully induced within the carbon matrices at the loaded fiber bundle interface.
Influences of Prosthesis Stem Lengths in Cementless Total Hip Arthroplasty
Authors: Abdullah Abdul Halim , Jaafar Emmi Farisa , Nasir Nursalbiah , Abdul Latip Eli Nadia , Tardan Giha
Published: March 2011

Stress shielding phenomenon is an important issues in considering the primary stability of the cementless hip arthroplasty. Stress shielding occurs when there is a mismatch in the elastic modulus of two materials perfectly bonded to each other, such as the prosthesis stem and the bone. In this study, influences of different prosthesis stem lengths on stress distribution in cementless THA are examined using finite element method. The calculated stress distribution is discussed with respect to stress shielding and primary stability issues in THA femur cases. Results show that similar pattern in stress distribution for intact and THA femur but differs in magnitudes. The stress level increases from the neck to the middle region and peaks at locations coinciding with the tip of the prosthesis. The maximum stress for intact femur is 55.5 MPa, THA with short stem is defined up to 112 MPa, while with medium and long stem are 204 MPa and 278 MPa, respectively.
Comparison of BP and GRNN Algorithm for Factory Monitoring
Authors: Su Ing Jiunn , Tsai Chia Chih , Sung Wen Tsai
Published: March 2011

Artificial neural networks (ANNs) are one of the most recently explored advanced technologies which show promise in the factory monitoring area. This paper focuses on two particular network models, back-propagation network (BPN) and general regression neural network (GRNN). The prediction accuracy of these two models is evaluated using a practical application situation in a monitor factory. GRNN emerged as a variant of the artificial neural network. Its principal advantages are that it can quickly learn and rapidly converge to the optimal regression surface with large number of data sets. According the simulation results we can show that GRNN is an effective way to considerably improve the predictive ability of BPN.
Design of Parallel Bearing Structure for 800MN Forging Press with Consideration of Manufacturing Errors
Authors: Li Yi Bo , Wu Dao Hui , Huang Ming Hui , Lu Xin Jiang
Published: March 2011

800MN forging press uses plate laminated parallel structure as the main bearing mode, where the force transfer and the stiffness match play key roles in achieving satisfactory performance of the equipment. Although the traditional design methods can obtain desirable stiffness or strength for bearing structure, they less consider the effect of manufacturing errors on the system performance and thus are ineffective. This is because manufacturing errors can cause local structure variation and heavy stress concentration, which may do great harms to the working performance of the equipment. In this paper, a new design approach is proposed to consider the effect of manufacturing errors to the system performance. First, a three-dimension finite element model of the 800MN forging press is built using Marc, upon which stress distributions and concentrations under different combination modes of manufacturing errors are studied. Then, combination law of manufacturing errors is established and validation is carried out through physic test.
Poisonous Plants Retrieval System Based on Mobile Devices
Authors: Hu Qiu Xia , He Dong Jian , Tian Jie , Zheng Peng Cheng
Published: March 2011

Identification of poisonous plants especially outdoor diet was practical for tourism in exciting outdoor travel. A new method called Poisonous Plants Retrieval System Based On the Mobile Device was proposed in this paper. The used mobile devices in this system were based on J2ME and the selected development platform was Eclipse. Firstly poisonous plants were classified into four main categories according to the subject categories of plants. Next, each of four main categories was classified into four sub-classes by analyzing the toxic parts or similar positions of plants. Then, to store the characteristics information of the subjects and poisonous position of plants, a symmetric two-dimensional array matrix form was developed. Finally the cell phone software retrieved known poisonous plant to help people make outdoor diet safe with high convenience.
Analyses of Earth Pressure on Gridding Concrete Retaining Wall in the Excavation of Deep Foundation Pit in Soft Soil Area
Authors: Zhou Guang Zhu , Wei Xu , Yu Chen
Published: March 2011

This paper is mainly to study earth pressure on Gcrw used as a new kind of supporting structures in the excavation of deep foundation pits in soft soil region. On the basis of the simulation of step by step excavation by using big finite element software Abaqus/CAE and considering three-dimension elastoplastic stress state, the characteristics of different earth pressure are systematically discussed upon practical engineering. By comparing simulation results with calculated results based on calculation formula of Rankine Theory, it can be seen that the earth pressure in active zone is different from theoretic active earth pressure and earth pressure at rest while walls and soil in the gridding are regarded as a whole, which is greater than the former and somewhere similar to the latter, the earth pressure in passive zone is bigger than theoretic value of passive earth pressure, it is the tensive force from partition wall that prevent the front wall from overturning. These conclusions will be helpful for design and construction of new retaining wall.
Nonlinear Periodic Oscillations of Micro-Voids in a Class of Incompressible Hyper-Elastic Spheres
Authors: Cai Miao Miao , Meng Jia Na , Yuan Xue Gang , Niu Da Tian
Published: March 2011

The problem of radially symmetric motion is examined for a pre-existing micro-void in the interior of a sphere under a suddenly applied outer surface tensile load, where the sphere is composed of a homogeneous incompressible hyper-elastic material. Through qualitatively analyzing the second-order ordinary differential equation that describes the motion of the pre-existing micro-void with time, some interesting conclusions are proposed. For any given values of surface tensile loads, it is proved that the motion of the pre-existing micro-void with time presents a nonlinear periodic oscillation, however, in certain cases, the oscillation amplitude increases discontinuously with the increasing values of surface tensile loads. Finally, based on the known transversely isotropic incompressible Gent-Thomas material model as an example, numerical simulations are carried out.
Network Construction of Waste Reverse Logistics in Developing China's New Rural Areas
Authors: Zhi Qiang Huang , Guo Yun
Published: March 2011

There are more than 900 million people in China's rural areas, and a great deal of waste is created in production and in living on a daily basis. The treatment and reverse re-using of agricultural waste is an important factor about the new green economy and safety of ecological environment in rural areas. China is the world's largest agricultural waste-producing country, so the analysis and research about the status and problems of rural waste facing China, and what countermeasures about developing the reverse logistics of agricultural waste can be obtained is very important to achieving sustainable agricultural development and constructing new rural areas into a well-off society.
Calculation for Flow Field and Motion of the Missile Capsule in Launching Tube
Authors: Ma Zhen Yu
Published: March 2011

Based on interior trajectory calculation of the missile capsule in underwater launching tube，the hydrodynamic pressure distributions of the capsule surface at different moments are simulated carefully by using Flotran module in Ansys software. The results provide some theoretical basis for main body structure design and performance optimization of the underwater capsule.
CO2 Trans-Critical Two Stage Compression Refrigeration Cycle with Vortex Tube
Authors: Xie Ying Bai , Cui Kui Kui , Wang Zhi Chao , Liu Jian Lin
Published: March 2011

The paper analyses CO2 trans-critical two stage compression refrigeration cycle with vortex tube expansion by thermodynamics method. And compare with CO2 trans-critical two stage compression refrigeration cycle with expansion value. The results show that in the calculated conditions of the paper, the performance of the cycle with vortex tube improves 2.4%~16.3% than the cycle with expansion value. The optimal discharge pressure maximizing COP of the cycle with vortex tube exists. With lower evaporating temperature or higher gas cooler exit temperature, COP of system decreases and COP improvement increases. The effect of cold fluid mass fraction on COP is not significant, but COP improvement increases more quickly with cold gas mass fraction increasing.
Magnetic Field Analysis of Surface-Mounted Permanent-Magnet Motors
Authors: Wu Yi Chang , Ou Feng Ming , Lin Bo Wei
Published: March 2011

The prediction of the magnetic field is a prerequisite to investigate the motor performance. This paper focuses on the magnetic field estimation of surface-mounted permanent-magnet (SMPM) motors based on two approximations, i.e., the magnetic circuit analysis and the finite-element analysis (FEA). An equivalent magnetic circuit model is applied to analytically evaluate the magnetic field of a SMPM motor with exterior-rotor configuration. The two-dimensional FEA is then applied to numerically calculate the magnetic field and to verify the validity of the magnetic circuit model. The results show that the errors between the analytical predictions and FEA results are less than 6%. It is of benefit to further design purposes and optimization of SMPM motors.
Effect of Actuating Forces on Aeroelastic Characteristics of a Morphing Aircraft Wing
Authors: Sleesongsom Suwin , Bureerat Sujin
Published: March 2011

An aircraft with morphing or adaptive wings can achieve its flight control through structural flexibility. In order to carry out such aircraft control, the wing structure is actuated by an external force. This leads to a change in aircraft aeroelastic and mechanical characteristics during flight such as lift, control effectiveness, divergence, flutter, buckling, and stress. The objective of this research is to demonstrate the aeroelastic and mechanical behaviors of a wing being actuated by external forces. Static and dynamic aeroelastic models of a wing structure subject to external loads are derived. An un-swept rectangular wing box, using a twisting morphing concept, is used for the demonstration. By applying various values of an actuator moment to the wing, aircraft design parameters e.g. flutter, divergence, lift effectiveness, buckling factor, and stress are computed. The investigation shows that the actuating force has an impact on the aeroelastic and mechanical characteristics. This effect should be taken into account during the design/optimization process of a morphing aircraft structure.
Research and Design of Pneumatic AMT Actuator
Authors: Wang Jian Zhong , Chu Liang , Lu Xin Tian
Published: March 2011

According to the design requests of certain heavy truck, this paper introduces a design scheme of pneumatic AMT automatic shift system, which focuses on the structure characteristics and working principles of the three-position cylinder controlled by two solenoid valves. And the mathematical model of the three-position cylinder controlled by two solenoid valves is established based on pneumatic principle. The dynamic model of this mechanism was built by AMEsim software. The variety of pressure and stroke of intake/exhaust chamber was simulated under different air pressures. The theoretical basis is provided to design the AMT election-shift actuator.
An Analytical Study on Influence of Movement Conditions of Ultrasonic Atomizing Nozzle on Performance of Spray Coating
Authors: Wu Yu Lieh , Lee Ya Koa , Chuang Wei Yen , Wang Yung Hsun
Published: March 2011

This study aimed to make the slurry droplets atomized by the ultrasonic atomization spray coating diversion system fall on the substrate surface of hot plate stably, instead of rebound or spill due to overly high pressure or speed that causes material waste and excessive or non-uniform spray coating. The lateral movement distance of the nozzle influences the uniformity of film thickness distribution, while the lateral movement distance influences the film uniformity and the spray coating efficiency; these two are important parameters to the efficiency of ultrasonic spraying equipments. Therefore, this study conducted a simulation analysis on the atomization flow field of ultrasonic atomization diversion systems, where the distribution of atomization flow field was analyzed at different lateral movement distances of the nozzle. By evaluating the performance of thin film coating, this study attempted to find out the optimal lateral movement distance of ultrasonic precision spray coating. The simulation analysis results were tested on a real machine for validation in order to identify the reliability of the simulation. The simulation result showed that the central part of the film in the position sprayed was thicker; therefore, the nozzle moved 1 cm horizontally at 0.1m/s to thicken the repeatedly sprayed area to improve the overall uniformity of the panel. The study analyzed the spray coating thicknesses according to 16 monitoring points in the repeatedly sprayed area on the panel. According to the thicknesses of the monitoring point positions, when the area that had been sprayed once was sprayed again by the nozzle moving 1cm laterally, the uniformity of overall film on the overall panel was improved significantly.
Performance Test of a 5-Stage Helico-Axial Multiphase Pump
Authors: Zhang Jin Ya , Zhu Hong Wu , Wei Huan , Peng Jing Ying
Published: March 2011

A 5-stage helico-axial multiphase pump was tested for studying its performance. The multiphase pump was tested on the conditions of different speed and different gas volume fraction (GVF). According to the test result, performances of the pump were analyzed. And the effects of speed and GVF to differential pressure and efficiency as well as to power of the pump were analyzed at the same time, so some conclusions were made basing of the above research and some of them are very helpful for the future application on the oilfield.
J-Integral Analysis of Surface Cracks in Round Bars under Bending Moments
Authors: Ismail Al Emran , Ariffin Ahmad Kamal , Abdullah Shahrum , Ghazali Mariyam Jameelah , Daud Ruslizam
Published: March 2011

This paper presents a non-linear numerical investigation of surface cracks in round bars under bending moment by using ANSYS finite element analysis (FEA). Due to the symmetrical analysis, only quarter finite element (FE) model was constructed and special attention was given at the crack tip of the cracks. The surface cracks were characterized by the dimensionless crack aspect ratio, a/b = 0.6, 0.8, 1.0 and 1.2, while the dimensionless relative crack depth, a/D = 0.1, 0.2 and 0.3. The square-root singularity of stresses and strains was modeled by shifting the mid-point nodes to the quarter-point locations close to the crack tip. The proposed model was validated with the existing model before any further analysis. The elastic-plastic analysis under remotely applied bending moment was assumed to follow the Ramberg-Osgood relation with n = 5 and 10. J values were determined for all positions along the crack front and then, the limit load was predicted using the J values obtained from FEA through the reference stress method.
Perforation of Cone-Nose Projectile to Bi-Layered Aluminum Alloy Foam Target
Authors: Bao Yong Gang , Zhang Nian Mei , Yang Gui Tong
Published: March 2011

A theoretical study is presented herein on the perforation of the cone-nosed projectiles against bi-layered laminated composite aluminum alloy foam target. Bi-layered targets were arranged according to the mass density and thickness of foam material. The dynamic cavity expansion theory is applied to formulate analytical model. The perforating process can be divided into 8 stages. The analytical equations during every stage are derived to evaluate the final penetration depth and penetration resistance during the whole perforating process. Penetrating depths, velocity limits and residual velocity of projectile are analyzed. The effect of mass density of target material and the layer thicknesses on the penetration resistance and capacity of absorbing energy are investigated. The results demonstrate that configuration of laminated targets and the initial kinetic energy play important roles during the perforating processes.
The Study of Bending Fatigue Strength Model for Scroll Wraps
Authors: Shao Bing
Published: March 2011

The paper analyzed the pressures and the temperatures in compression chambers to calculate the bending fatigue strength for small parameter scroll wraps, and a load model is proposed. For the small parameter scroll wraps, the pressure loads can be simplified on the mid-areas and the temperatures are equal to the temperatures of the mid-areas. The pressure loads are of π-region pressures which have a normal angle interval of π, the number of acting regions for pressure loads is equal to the number of scroll compression chamber pairs. Apart from the part situated in the center compression chamber, the temperatures of scroll wrap decrease linearly with the normal angle. Selecting the reasonable discharge, specifying the appropriate material and the parameters, and modifying the starting part of scroll wrap are significant methods to improve fatigue strength of scroll wraps in practice.
Simulation of Sound Wave Propagation at the Inlet of a Jet Engine
Authors: Liu Zhan Xin , Wang Si Wei , Gao Ping
Published: March 2011

Simulation of sound wave propagation at the inlet of a jet engine is difficult due to the complex geometries of the propagation channel, so many simplifications are needed. A more realistic model is introduced in this paper to do the simulation. Dispersion-relation-preserving finite schemes are used in this paper where structured grids are designed by conformal mapping; the advanced perfectly matched layer absorbing boundary conditions are used to prescribe the input sound wave at the fan face of inlet. The advantages of the methods used in this paper are shown by two different cases.
An Investigation of a 3-PRS Parallel Motion Mechanism with Intersecting Rails
Authors: Cheng Yuan Ming
Published: March 2011

This study proposes a 3-axis AC servo motor parallel platform with intersecting rails. The 3-actuators are designed to be horizontally on the base platform with their extensions intersect in the base platform center. The forward kinematics, inverse kinematics and work space of this mechanism are established and the singularity distribution is investigated. Optimal maneuvering regions are recommended from the viewpoints of singularity and stiffness.
Development of New Type Settlement Plate in Settlement Observation on High-Speed Railway
Authors: Feng Huai Ping , Chang Jian Mei , Yue Zu Run
Published: March 2011

The stability and smoothness of embankment is very important factors for the design of a new high-speed railway project. To make an accuracy prediction of the post-construction settlement, it is necessary to carry out a carefully settlement observation during the construction of embankment. The defects of traditional settlement plate, however, are well known as disturbing construction and destroyed easily by construction. In this paper, based on the application in Shi-Wu passenger dedicated line, a new type of settlement plate has been developed. The application of this new type of settlement plate in site shows that it has no any disturbs on the pavement and compaction of embankment. And measurement becomes simple and easy to operation. Accordingly, high accuracy of settlement observation can be obtained by this method, which has the value of application in high-speed railway settlement observation.
Home Intelligent Service Control System Based on CAN
Authors: Yu Hong Bo , Zhu Heng Jun , Tao Bai Rui , Li Hui
Published: March 2011

This paper design an integrated intelligent control of information transmission system of the family which uses CAN as a bus. This system uses ARM S3C2440 as the master chip, multiple CAN nodes as a data exchange module, complete the household smoke alarm, access control security and meter reading functions. Between the smoke alarm module and the CAN using ZigBee wireless data transmission. Between the module and the CAN sub-meter reading using radio frequency technology for data exchange. The whole system combines the wireless module with CAN-bus which has a flexible, intelligent, and stability advantages.
Integral Equation Method for Free Vibration of Annular Plates with Elastic Supports
Authors: Cheng Gang , Wang Wei Dong , Cheng Quan
Published: March 2011

Annular plates are commonly found in the fields of engineering. The present study is concerned with the integral equation method for the free vibrations of annular plates with elastic supports. A set of complete systems of orthogonal functions, which is constructed by Bessel functions of the first and the second kind is used to construct the Green's function of annular plates. The eigenvalue problem of free vibration of annular plates with Elastic Supports is transformed into the eigenvalue problem of integral equation. And then, the problem of integral equation is transformed into a standard eigenvalue problem of a matrix with infinite order. Numerical example shows the significant advantages of the present method.
Hinf Tracking for a Class of Second-Order Dynamical Systems
Authors: Huang L. , You Bo , Li W.L.
Published: March 2011

The problem of tracking for second-order dynamical systems subject to disturbance input is considered by using a complete parametric design approach. The goal of this problem is to design a controller such that the output of the controlled system robustly asymptotically tracks the output of the reference model, and the transfer function from the exogenous disturbance to the tracking error meets a prescribed norm upper bound constraint. Based on the complete parametric solution to a class of generalized second-order Sylvester matrix equations, complete parameterizations for all the controller gain matrices are established in terms of two set of freedom parameters. Also, based on these parametric gain matrices, the prescribed norm upper bound constraint is transformed into an equivalent constraint condition which restricts the choice of the freedom parameters. An example is utilized to show the effect of the proposed approach.
Numerical and Experimental Analysis of Light-Weighted Primary Mirror for Cassegrain Telescope
Authors: Lin Yu Chuan , Lee Long Jeng , Chang Shenq Tsong , Cheng Yu Cheng , Huang Ting Ming
Published: March 2011

This article reports an approach of light-weighted mirror design and analysis to increase the weight reduction ratio and improve optical performance based on the finite element method and opto-mechanical analysis. The approach is to represent mirror surface deformation derived from finite element analysis (FEA) by Zernike polynomials, such that the impact of deformation on optical system performance can be evaluated by the optical design and analysis program. The experimental modal analysis was also performed to validate the FEA results. The numerical result shows that the light-weighted primary mirror of Cassegrain telescope is obtained by this approach and predicted deformation fulfills the requirements of optical design.
Deformation Control in Wear-Resistant Steel Quenching Process
Authors: Zhu Dong Mei , Zhang Shao Jun , Liu Guo Yong
Published: March 2011

Computation model for TNM360 wear-resistant steel quenching process is established by finite element method. Four work conditions are designed for studying the effect of different location of cooling zone on quenching plate shape. And the temperature field and stress-strain field under four work conditions are calculated through the established model. For 20mm thick steel plate, the effect of uneven cooling of the front of cooling zone on the plate shape is larger than that of the rear of cooling zone. Under different work conditions, the effect of thermal stress on plate shape is different with phase transition stress. The results of the study provide important theoretical basis to control wear-resistant steel plate shape and improve production efficiency and manufacturing yield.
The Status and Progress of Waste Paper Recycling
Authors: Fang Chang Qing , Zhang Ying , Hu Jing Bo , Zhang Min , Yu Rui En
Published: March 2011

Rapid economy development and upsurge of paper consumption cause the shortage of paper material. Waste paper recycling can solve this problem effectively. This paper analyses the status of waste paper recycling in China and abroad，also the technology development trend. According to the situation of our country, suggestions for strengthening recycling of waste paper are proposed.
Optimization Research of Multi-Point Response Control under Multi-Support Excitation in Vibration Test
Authors: Hu Jie , Chen Da Lin , Feng Jia Quan , Zhang Xi Nong
Published: March 2011

As an important experiment way adopted in vibration test, response control method obtained more and more attention in recent years, this paper studied the multi-point response control under multi-support excitation in vibration environment test, deduced the transfer equation set between base control excitation and structure response. After analyzing these transfer equation set, the existence and uniqueness of base control excitation was discussed, and proposed an optimization method to solve these transfer equation set based on genetic algorithm (GA). The numerical simulation result indicates the validity of the proposed optimization method. These works provided a theoretical foundation for multi-degree of freedom vibration test in a certain extent.
Monitoring of Deep Processing of Oil De-Noising Technique
Authors: Jia Xiao Gang
Published: March 2011

Oil for deep processing of the signal contains a lot of pulse interference monitoring and random non-stationary noise characteristics; this paper presents a wavelet-based moving average against impulse noise filter. First on the hydraulic signal wavelet de-noising, wavelet processing and then the results after anti-pulse moving average processing. The simulation signals and hydraulic monitoring signal de-noising experiments show that: the use of wavelet technology and anti-pulse interference filter combination of moving average method has good oil pressure monitoring signal filtering, to achieve deep process debris blocking fault laid the foundation for monitoring.
Numerical Study of the Flow Field in a Vertical Roller Mill
Authors: Dou Hai Jian , Chai Xing Teng , Nie Wen Hai
Published: March 2011

In order to reduce the larger pressure resistance (pressure difference between inlet and outlet) of a vertical roller mill, the flow field in the vertical roller mill is numerically simulated by CFD technology. Based on the simulation results, the reasons that led to the larger pressure resistance of the vertical roller mill is studied, offering the theory guide for the technology of reducing pressure resistance of the vertical roller mill.