bluuebunny/crossref_metadata_2025 huggingface dataset:
Design and Implementation of Network Reliability for Intelligent Fire Control Training System
Authors: Hao Na , Bai Fan , Chang Tian Qing
Published: February 2012

In the detailed analysis of the data transmission needs of the intelligent fire control training system, the network management is modeled based on Unified Modeling Language (UML). In order to improve the reliability of network transmission, authentication part is designed in the server side, and a connected state detecting method is proposed, which is based on heartbeat mechanism and with data-carrying. Test results show that the network system has got higher reliability while satisfying the real-time constraints. It can provide certain valuable reference to network system designing of the similar corresponding systems.
Investigation of Friction Temperature in Railway Disc Brake
Authors: Nong Wan Hua , Gao Fei , Fu Rong , Han Xiao Ming
Published: February 2012

The distribution of temperature on the rubbing surface is an important factor influencing the lifetime of a brake disc. With a copper-base sintered brake pad and a forge steel disc, up-to-brake experiments have been conducted on a full-scale test bench at a highest speed of 200 Km/h and a maximum braking force of 22.5 KN. The temperature distributions on brake disc surface have been acquired by an infrared thermal camera, and the contact pressure on the contact surface of the friction pair has been calculated by the finite element software ABAQUS. The results show that the area and thermal gradient of the hot bands increase with the increase of braking speed and braking force. The hot bands occur in priority at the radial location of r=200 mm and r=300 mm, and move radially in the braking process. The finite element modelling calculation indicates that the distribution of the contact pressure on the disc surface in radial direction is in a "U"-shape. The maximum contact pressure occur at the radial locations of r=200 mm and r=300 mm, and the minimum contact pressure occur in the vicinity of the mean radius of the disc. The conformity of contact pressure distributions with the practical temperature evolutions indicates that the non-uniform distribution of the contact pressure is the factor resulting in the appearance of hot bands on the disc surface.
Experimental Research on Bearing Capacity of Concrete Columns with High Strength Concrete Core under Axial Compression Loading
Authors: Qi Yue
Published: February 2012

Based on experimental research on plain concrete columns with high strength concrete core, the formula to predict the bearing capacity of concrete columns with high strength concrete core under axial compression loading was brought forward in previous paper, in order to verify the formula whether right, axial compression test including 3 concrete columns with high strength concrete core and 1 ordinary reinforced concrete column were completed, and the failure characteristic was analyzed additionally. According to experimental results, it can be shown that the failure modes of concrete columns with high strength concrete core are similar to that of ordinary reinforced concrete columns, however, the bearing capacity of concrete columns with high strength concrete core is significant higher compared with that of ordinary reinforced concrete column; the results of the bearing capacity obtained by the formula (2) was in good agreement with the experimental results.
The Development of Stiffness and Strength Simulation Template for RCWS Barrel Based on ANSYS Workbench
Authors: Mao Bao Quan , Xu Li , Wu Yong Liang , Dai Dong Ming
Published: February 2012

Stiffness and strength simulation of Remote Control Weapon Stations (RCWS) at the design and demonstration stages should be convenient, quick and accurate. In order to satisfy those needs, this paper develops a stiffness and strength quick simulation template for RCWS barrel, which is based on co-simulation environment ANSYS Workbench, and using of JavaScript language. In the end, the stiffness and strength of a RCWS barrel is analyzed by this template.
Research on Load-Bearing Characteristics of Precision Air-Bearing Rotary Stage
Authors: Lin Jie Qiong , Wang Lei , Gao Ming Hui , Ran Tong Huan
Published: February 2012

Air-bearing is a core component of air-bearing rotary stage. The weakness that the air-bearing has the low load capacity and stiffness has been concerned about by domestic and foreign scholars. So how to improve the load capacity and stiffness has become a serious problem. In order to improve the load capacity and stiffness of the air-bearing rotary stage, in this paper, we improved structure of Zhang Wenjie and others’ high-precision direct-drive air-bearing rotary stage. The gas film of air-bearing has been meshed by GAMBIT software, and we use FLUENT software to obtain the carrying capacity features of the gas film. Finally, the structural static force of the precision air-bearing rotary stage will be analyzed by ANSYS software. The analysis results show that: the structural design of the precision air-bearing rotary stage is reasonable, and this structure can provide a larger range of loads. Even in heavy load conditions, a larger deformation will not occur any more. It has a good practical value, and also can be widely used in high precision equipments.
Probabilistic Model of the Multiaxial Low-Cycle Fatigue Life Prediction
Authors: Wang Lei , Sui Tian Zhong , Zhao Hang , Men En Guo
Published: February 2012

First, several widely used models of the multiaxial low-cycle fatigue life prediction based on the critical plane approach were presented in this paper, and the predicted results of these models for a medium carbon steel under the condition of multiaxial low-cycle fatigue loading were compared. Second, the stochastic expressions and probability density function curves of the fatigue performance parameters were obtained by probabilistic analysis of the medium carbon steel fatigue data. Finally, the probabilistic model of the multiaxial fatigue life prediction was simulated by Monte Carlo Method, which should provide a basis for the reliability analysis of engineering components subjected to the multiaxial complex loads.
A New near Point Denoising Algorithm for Point Cloud
Authors: Zhao Can , Shi Yun Ling , Cheng Jun Ting
Published: February 2012

For the mass point cloud, which is generated by large work piece for free surface, the point cloud noise removal is the most important step, after denoising point cloud which quality will directly influence the follow-up point normal vector estimation and curvature estimation. Therefore, this paper presents a simple and efficient algorithm for near-point denoising. Firstly, it using the bounding box for messy point cloud data differentiate space topology structure, then, traverse all points, for each point looking for its K neighborhood, and fitting quadric surface using the K neighbors; finally, using Z value method for calculation of the distance that point to the secondary surface distance. Setting threshold, and if the distance beyond the threshold, then the point that noise points and delete. Experiments show that this algorithm compared with the traditional algorithm, not only improve efficiency, and can be a very good retain the original model data, but also for the follow-up process provides high quality raw data, there is a wide useful in three dimensions scanning, projective measurement reverse design and other fields.
Automotive Electronic Control Components Energy Consumption and Environmental Emissions Analysis in China Based on Economic Input-Output Life-Cycle Assessment Model
Authors: Wang Jun Jun , Wang Lu , Chen Ming
Published: February 2012

With the rapid growth of vehicle population and electronic control components used in automotives in China, the energy consumption and environmental emissions of automotive electronic control components in 2007 are calculated by adopting the EIO-LCA model. The calculation results indicate that automotive electronic control components consume 20306000 tons of standard coal equivalent (SCE), which is a large consumption of energy, and make a lot of toxic environmental emissions. However, in China, after the automotives are scrapped, the automotive electronic components are either discarded carelessly or smashed into pieces along with the vehicles for material recycling. This unreasonable treatment of these components can result in great damage to the environment and resource wastage. Therefore, in this study, the automotive electronic control components recycling strategy and a technology roadmap in accordance with China’s actual conditions are provided for energy conservation and toxic environmental emissions reduction.
Simulation Design of Bionic Blade on Wind Turbine
Authors: Zhou Hai Feng , Du Chen He , Huang Yuan Qing
Published: February 2012

After millions of years of competition and the natural evolution of species, the biological nature (plant leaves) has formed a number of natural and rational structure. This form of the structure and organisms inherit environmental stress exist some connection. This paper as a study of plant leaves, using numerical simulation methods to explore the structure and mechanical properties of plant leaves the relationship between: Collection of fresh plant leaves, leaf through the AutoCAD software to obtain the coordinates of the point cloud, created in the ANSYS finite element model of a simplified blade, applied uniformly distributed wind load calculations to solve; and optimal blade vibration modal analysis program.
Analysis and Reconstruct of Complex Data Based on 3D Laser Scanner
Authors: Cheng Xiao Min , Ye Zi Qing , Zhang Jian Jian
Published: February 2012

Solve the problem of simplifying, aligning, and restoring while rebuilding a large number of point group data. First, scanning art work by using 3DFAMILY laser scanner and obtain the 3D data of its surface, then removing the desultory points on the boundary, using curvature simplification and point position alignment to revise data. Finally, fixing the loophole and modify the convex block partially and finishing up 3D reconstruction. We transform the reconstruction result into STL format file, and build the prototype of art work in Rapid Prototyping System.
Design of Flammable Gas Monitoring Circuit Based on TGS813
Authors: Chang Cui Zhi
Published: February 2012

In this paper, a flammable gas monitoring circuit is designed based on TGS813 that is a flammable gas sensor and has the characteristic of long life-pan, low prices. The principle and structure of TGS813 are introduced as well as applied in multi-channel data acquisition circuit.
Design and Simulation of a Novel Check Valve Made by SU-8
Authors: Guo Tai , Zhang Cong Chun , Ding Gui Fu
Published: February 2012

In this paper, we describe the design, simulation of a novel check valve suitable for potentially embedding in polymeric microfluidic devices such as micro-pumps. Using SU-8 as functional material, the check valve can be fabricated by MEMS technology, such as, UV-LIGA and electroforming. The check valve mainly consists of two structural layers: inlet layer and valve membrane layer. From simulation, the maximum deflection of check valve membrane is 116μm under pressure of 2000Pa, and the maximum stress is 18.1MPa. We consider the fit thickness of valve membrane is 20μm. Simulation results demonstrate that this novel check valve can be potentially integrated in many micro-pumps and other lab-on-a-chip systems.
Research on the Design for Sustainability and its Green Building Materials
Authors: Sun Ke Zhen
Published: February 2012

The paper gives account of the relationship between design for sustainability and its related factors. It includes the concepts of sustainable development, planning and design achievements and the use of green material. The concepts of sustainable development should be made of the strategies of effective planning and design, the personal safety problems and ecological strategies, green building materials, the appropriate and reliable technology, interdisciplinary working and integrated collaboration in research on green building materials. In addition to these, the article studies the main categories of green building materials, including ecological safety materials, low-carbon materials, and recycled-content materials.
A Study on De-Icing Technology for Electric Transmission Line
Authors: Huang Qin Zhu , Liu Jian Wei , Zhou Ya , Liao Yan Jun , Lv Ning
Published: February 2012

The article aims to analyze kinds of de-icing methods in detail with the present condition that the transmission lines often suffered serious damage with the deep ice over them. It also points out the development trend of de-icing technology in the next years and provides some advices for the de-icing research work of transmission line in our country.
A New Vehicle Platform for Crop close Proximity Measurements
Authors: Zhao Bin , Gao Feng , Tian Lei
Published: February 2012

A new wheeled vehicle had been developed for crop close proximity monitoring of Miscanthus, which could be one of the most potential candidate of bioenergy crop, and have been paid attention nowadays. The new vehicle employed 4WD-4WS system. And 3x3x3 meters steel frame structure was especially designed for tall crops as Miscanthus. The new data acquisition vehicle makes data sampling much convenient and efficient without huge labor consumption. The data acquired by remote sensing system on the platform could increases the spatial, spectral and temporal resolution of the crop remote sensing data significantly, comparing to satellite and aerial remote sensing system.
An Implementation Method of Encrypting Partial Bitstream Based on FPGA
Authors: Wang Wei , Xu Fei , Yin Jun
Published: February 2012

Partial reconfiguration of FPGAs requires loading partial bitstream. But loading a faulty or corrupted partial bitstream might cause some errors when undergoing reprogramming; what’s more, it may damage the FPGA device. A encrypt method based on cyclic redundancy check (CRC) before loading them into the device is introduced. The encrypt method of partial bitstream can realize the data integrity and security of FPGA Partial Reconfiguration.
Achievement of the Novel Lidar Visibility Measurement System
Authors: Feng Shuai , Jiang Li Hui , Xiong Xing Long , Zhuang Zi Bo
Published: February 2012

Atmospheric visibility is close to the transportation safety. In order to get accurate atmospheric visibility, according to atmosphere backscattering theory, a novel visibility measurement system is designed. The system adopts many modular devices such as semiconductor laser, silicon avalanche photodiode detector, multi channel photon counting card, embedded computer and so on. Where embedded computer is the core of the system, to realize system timing control, visibility inversion and information display. Finally, the objective and convenient measurement of atmospheric horizontal visibility and slant visibility are achieved. Outfield comparison experiments show that in low visibility weather conditions, the system obtains high measurement accuracy, which has high practical value and wonderful development prospect.
Research on the Relationship of Flow Velocity and Particles’ Separation in Cyclone
Authors: Zhang Ying , Zhang Zhen Wei
Published: February 2012

This paper mainly focuses on the numerical simulation of flow velocity aiming to obtain the velocity distribution of flow in the cyclone. The authors took advantage of RSM turbulence model of software FLUENT to calculate the velocity distribution. Relationship between particles separation and double-layer rotating flow can be obtained based on the simulation results, which can also provide basis for the improvement of structure design and separation performance.
A Mechanical Calculation of the Flexible & Floating Anti-Ship Collision Device for Bridge Piers
Authors: Lv Wei , Lu Rui Lin , Ning Xiang Liang , Yuan Yuan , Hu Yu Xin , Zeng Hua Juan
Published: February 2012

This study conducts simulation analysis of collision processes between a ship and a pier with the finite element software ABAQUS. It aims to compare peak values of impact forces, stresses and strains of the anti-collision device, and energy changes of the system when with or without the bridge pier protection buffer, so as to verify the device’s role in buffering impact and greatly improving the pier’s resistance to impact.
Difficulties and Solutions on Tight Sandstone Reservoir Hydraulic Fracture in Yanji Basin
Authors: Bi Xue Liang , Hou Sheng , Li Wei , Zhang Yang , Du Shu Ming
Published: February 2012

Hydraulic fracture, as a stimulation treatment, has been widely used in process of oil exploring in oil well. But in tight sandstone reservoir, it still exist many problem due to compactness, low-permeability, hardness and brittleness characters of the sandstone. To resolve the problem above-mentioned,this text considering the low natural productivity status of tight sandstone reservoir in Yanji Basin, to analyze the reservoir characters of tight sandstone reservoir base on density testing and mechanic parameters testing of the stone. The results shown that the special reservoir characters of tight sandstone sand lead to high fracture pressure of formation, poor connectivity of fracture, filtration and backflow problems of fracturing fluid. So we put forward reasonable recommendations for fracturing to resolve the problem above-mentioned. Through the application of oriented perforating technology, improvement of fracture fluid system and fracturing technology, provide a new effective technological measure for fracturing in tight sandstone, and promoting the development of fracturing technology in tight sandstone reservoir.
Intelligent Substation 3D Design System Structure
Authors: Lan Qi , Wang Yan Jun , Zhang Zhuo
Published: February 2012

In accordance with the goal of building a unified national grid company strong and intelligent grid requirements for the practical needs of network engineering and design work and finish construction of three-dimensional design system for intelligent substation. While retaining the traditional design of planar projection based on the parallel use of three-dimensional drawing tools, using refined design, for security checking interval, the wire mechanics, lighting, materials of statistics, Achieving intelligent substation digital transfer, and lay the Foundation for the whole project life-cycle management.
Design of Stepper Motor Controller Based on Fuzzy BP Neural Network
Authors: Yang Ju Qing , Liu Jiao Yue
Published: February 2012

This paper proposes the conception of stepper motor controller’s design on the basis of the principle and algorithm of fuzzy BP network. It realizes the control function by identifying the consequent parameters. After taking some simulation experiments, the system control performance is good, the system operation is stable, and no runaway phenomenon has happened.
Design Analysis of Vertical Lathe Auxiliary Equipment for Large Pressure Vessel Processing
Authors: Xing Huai Nian , Zhang Xiao Peng , Liu Zeng Li , Jin Li Qiang
Published: February 2012

The design analysis of vertical lathe auxiliary equipment for large pressure vessel processing has been done in this paper. The finite element method has been used to find the main factors which influence the processing precision. The results show that the main factor influencing maximum displacement of overall structure is not the vertical lathe cutting force but the weight of the large pressure vessel. So it is unreasonable to control the processing precision by the whole structure maximum displacement. The horizontal displacement is the main factor in controlling processing precision. The pressure vessel work piece sits on the top plate of the vertical lathe auxiliary equipment. So the displacement of the top plate of the vertical lathe auxiliary equipment is the main factor influencing processing precision. This kind of design thinking has been successfully applied in three type large pressure vessels. It has certain reference value in similar design.
Optimization of Conditions for Calcium Lactate Nano-Particle Production by Chemical Precipitation
Authors: Wang Yu , Huang Liang , Wu Jiang
Published: February 2012

In this paper, the optimization of conditions for calcium lactate nano-particle production by chemical precipitation by the orthogonal method was reported. The optimal conditions for enhancing yield and purity of calcium lactate were determined as: mixture ratio between lactic acid and Ca(OH)21.35:1, Ca(OH)20.46 mol•L-1, lactic acid 6 mol•L-1, reaction temperature 50 °C,reaction time 30 min, reaction mixing speed 500 r•min-1, mixture ratio between the volume of alcohol addition and total reaction 1:1. This optimization strategy lead to an calcium lactate nano-particle yield of 85% and the purity of 98%, which was considerably higher than that obtained in preliminary studied. The TEM images shown that the width of the calcium lactate was about 100 nm.
Special and New Monolithics
Authors: Angelescu Nicolae , Amziane Sofiane , Ionita Cristina , Ion Ioana , Stanciu Darius
Published: February 2012

The paper shows the constituents and technical properties of low calcium aluminates cement concretes with ultra dispersed mineral powders and admixtures.
Synthesis of Monodispersed CeO2 Nanoparticles Induced by Microwave Irradiation in Alcohol/Water Mixed Solvent and their Application in CMP
Authors: Chen Yang , Mu Wei Bin , Tang Zhao Fang , Zhu Ya Juan , Chen Zhi Gang
Published: February 2012

CeO2nanoparticles were synthesized by homogeneous precipitation in mixed solvent of alcohol and deionized water under microwave radiation using Ce(NO3)3•6H2O and HMT as starting materials. The structure and morphology of the products were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), selected-area electron diffraction (SAED), and BET-N2. The oxide chemical mechanical polishing (CMP) behavior of the as-papered CeO2abrasives was investigated by atomic force microscope (AFM). The results indicated that the obtained CeO2particles were monodispersed with an average diameter of ca. 10 nm. There was a quite good consistency in the particle sizes from TEM and BET analyses. Polishing tests showed that the as-prepared ceria abrasives exhibited a good oxide CMP performance, which might attribute to the uniform size and shape of the as-prepared CeO2particles. In addition, the polishing pressure had an obvious influence on the surface topography, profilogram and roughness.
Effect of Hot Air Aging on Structure and Properties of Raw Natural Rubber
Authors: Zhang Bei Long , Deng Wei Yong , Wang Ping Yue , Huang Hong Hai , Ding Li , Wang Yong Zhou
Published: February 2012

The molecular structure, molecular weight and its distribution, P0, PRI, Mooney viscosity, processibility of raw natural rubber, curing characteristics of compounds and mechanical properties of vulcanites were studied by hot air aging. The results show that for raw natural rubber after heating at 70°C for 20 days, C = C bond of molecular chains was broken, the numbers of the C = C bond decreased, methyl oxidized, and –OH and –COOH formed. The number-average molecular weight, weight-average molecular weight and viscosity-average molecular weight decreased, the molecular weight distribution became wide. P0, PRI, Mooney viscosity, rubber elastic torque S ', viscous torque S ", elastic modulus G', viscous modulus G" and complex viscosity η* decreased, loss factor tanδ increased. The curing rate of compound reduced and curing characteristics were inferior. The elongation at break and tensile strength decreased, and tensile stress at 300% modulus and 500% modulus did not change obvious. Anti-aging property became deteriorate.
A Review of Auto-Guided-Vehicles Routing Algorithms
Authors: Dahari Mahidzal , Liu Yang
Published: February 2012

In this paper, several principles of popular routing algorithms and models of Auto-Guided-Vehicles are presented. Tests were conducted and performance conclusions are given. In general hybrid methods are recommended in research and application.
The Visualization Research on Cavitation Flaw of the Jubilance Toy's Part with Different Wall Thickness
Authors: Li Yong , Zhang Yu Xin , Sun Zhi Qiang , Zhang Rui Zhu
Published: February 2012

The injection molding process with different wall thickness may create the obvious cavitation flaw. So carried on the kinetic simulation of filling injection using plastic advisor with Pro/E software, and discussed the melt flows in the mould. Research the cavitation defect of the jubilance toy's part with different wall thickness, and forecast reasonably position and quantity of the cavitation, and through the change of formation technological parameter, obtained the relatively good formation technological combination, achieved the reduced flaw quantity. Which provided the theory basis to study and removes the product flaw, provided reference for the discussion injection CAE, indicated it had great singlenificance for the visualization experimental study.
An Economic Analysis and Calculation for Selecting of the Phase-Change Heat Storage Materials Used in the Roof with a Solar Energy Storage Ventilation Systems
Authors: Zhao Juan , Lu Jun , Chen Peng , Zhang Ya Qin , Liao Liao
Published: February 2012

the experiments set up a roof model with a solar energy heat storage ventilation. According to the actual demands of experiments, through an economic analysis it results the preliminary investment of the solar energy storage ventilationthe system is between 307~367Yuan/m2 by calculating a energy balance in some way and choosing some type of heat storage phase change materials with a suitable quantity to fit for the model.
Study on Supplier Selection and Evaluation in Serviced-Oriented Manufacturing Network Based on NN
Authors: Guo Rong , Mo Rong , Sun Hui Bin
Published: February 2012

The nature of service-oriented manufacturing network is modular service network for capacity need based. The difference in service capability increases the manufacturing networks’ uncertainty, making the choice of supplier more complex. A strategy for supplier selection applying FWNN (fuzzy wavelet neural network) was presented in this paper. The first stage makes use of fuzzy system, with strong competency in knowledge representation, to convert fuzzy input parameters into crisp parameters. The artificial neural network was applied to overcome adverse effects resulting from supplier selection of non-liner and dynamic property in the second stage. The simulation was made to check the performance of the algorithm. The result indicates that this method can overcome the insufficiencies of subjectivity, arbitrariness, complicated algorithm and fuzzy input parameters in supplier selection, which realizes real-time dynamic evaluation and rapid selection under the service-oriented manufacturing environment, and its maximum relative error is less than 0.4841%.
Load Analysis of Wheel Hub Bearing in Wheel Driving System with Exterior Rotor Motor
Authors: Wu Jia , Xiong Lu
Published: February 2012

Wheel hub bearings are weak parts in wheel driving system because of its bad condition of loads. This paper has selected two typical extreme working conditions for vehicle, namely braking with turning and driving with turning, and analyzed loads of wheel hub bearings. The design parameters of wheel hub bearings are analyzed separately, with the purpose of finding the key parameters in them, which influenced the force of bearing, and finally these important parameters for structural design have been optimized, the force of wheel hub bearings has been decreased by 45%.
A Method for Modal Parameter Identification of Time Varying Vibration Systems
Authors: Wu Zi Ying , Shi Kun
Published: February 2012

In this paper a new time varying multivariate Prony (TVM-Prony) method is put forward to identify modal parameters of time varying (TV) multiple-degree-of-freedom systems from measured vibration responses. The proposed method is based on the classical Prony method that is often used to identify modal parameters of linear time invariant systems. The main advantage of the propose approach is that it can analyze multi-dimensional nonstationary signals simultaneously. A modified recursive least square method based on the traditional one is presented to determine the TV coefficient matrices of the multivariate parametric model established in the proposed method. The efficiency and accuracy of the identification approach is demonstrated by a numerical example, in which a TV mass-string system with three-degree-of-freedom is investigated. Satisfied results are obtained.
Dynamic Characteristic of MEMS Inertial Device by Simulation
Authors: Wang Jian , Liu Shuang Jie , Zhang Le
Published: February 2012

Inertial device is an important part of the fuze system. It is a key mechanism to keep safety at ordinary times and period after launch. Therefore, the dynamic characteristics of the inertial device during falling or launching environments are very important. The paper make a study of the dynamic characteristics of the MEMS inertial device used in the fuze of the ammunition under the two kind of inertial acceleration by simulation. The simulation result shows that the MEMS inertial device can ensure the safety of fuze and ammunition.
Dynamic Analysis of Rubbing Rotor System Based on Hertz Contact Theory
Authors: Liu Yang , Li Qin Liang , Chen Ya Zhe , Wen Bang Chun
Published: February 2012

When discussing the rubbing issue of rotor system, the effect of nonlinear rubbing force is needed to be considered. In this paper, modeling and numerical simulation were carried out by using the nonlinear rubbing force based on Hertz contact theory, and researching the dynamic response of fault rotor system in the conditions of the different rubbing stiffness. Through the analysis we found that, in the case of larger rubbing stiffness the result simulated by using rubbing force model based on Hertz contact theory has stronger nonlinear and more obvious rubbing feature, compared to the rubbing model of linear stiffness. It is beneficial to determine the occurrence of rubbing. Refer to the relevant experimental results, the correctness of the Hertz rubbing model and the feasibility of applying it in the modeling of rubbing rotor system were confirmed.
Dynamic Simulation Analysis of Gatling Gun Based on Virtual Proto Model
Authors: Li Tao , Wang Rui Lin , Liu Lin Hua
Published: February 2012

Description of the dynamic characters of the main parts of pistol is necessary. On the basis of analyzing the motions and forces of every part of some Gatling gun, a 63-degree-of-freedom virtual prototype composed by 101 rigid bodies is established by means of Solid Works and ADAMS. The validation is made and the credibility of the virtual prototype is approved by compared to the simulation result and the experimental data of the barrel Angular displacement, velocity and displacement of bolt frame. The dynamic simulation analysis of automata is produced. Moreover, the influence of some structure parameters on the dynamic characters of the main parts is studied by simulation, which has laid the foundation for further simulation and structural optimization
Study on Typical Traditional Silk looms in Shanxi Province
Authors: Lu Wei , Yang Xiao Ming
Published: February 2012

Traditional silk looms are connected with traditional textile technology, which also represent the development degree of technology and society. This thesis discuss some kinds typical traditional silk looms of Shanxi province, in north of China, and draw a conclusion that standing loom originated in Song dynasty still existed in a few villages until modern China, but other two typical silk looms originated from the Ming dynasty and were used and widespread until 1980s in north of China. This thesis focuses on the key parts and functions of silk looms, explains the operation mechanism, and also compares the similar looms in different regions.
Effect of Ball Milling on Reaction Mechanism between Ti and B4C and Subsequent Densification
Authors: Wang Hui Hua , Sun Shu Chen , Wang De Yong , Tu Gan Feng
Published: February 2012

The effect of ball milling pretreatment of the starting Ti and B4C powder blends on the synthesis of dense TiB2/TiC composite was investigated. X-ray diffraction analysis showed that the TiC phase was not produced until the milling time was up to 18h and only a minimal amount of TiB2was generated, even after 48h of milling. It is clear that no complete conversion of the starting reactants to the desired products characterized as TiB2/TiC powder mixture take place within the investigated conditions. The decreased particle sizes of the reactants and high concentration of defects induced from ball milling, allow the completely chemical reaction of reactants into the desired composition (2TiB2/TiC), corresponding to the rapid and significant sample shrinkage occurring before 500°C. The target products obtained starting from mechanical activation reactants also showed relatively uniform microstructures and densities greater than 98% of the theoretical value.
The 3D Incompatible Element Modeling of Flexible Body in Multibody System Dynamics
Authors: Cao Da Zhi , Zhao Zhi Hua , Ren Ge Xue , Qiang Hong Fu
Published: February 2012

An efficient 3D incompatible element for the simulation of Flexible Multibody System (FMBS) is derived based on the principle of virtual work and the theory of continuum mechanics. The presented incompatible element uses absolute coordinates and internal parameters for the degrees of freedom and fixed the locking problem under the state of pure bending. Considering the geometric nonlinearities and using the Total Lagrangian Formulation, system dynamic equations are derived and then solved by the Backward Difference Formula (BDF) in conjunction with Newton-Raphson algorithm. Eigenvalue analysis and dynamic analysis of several numerical examples are presented to show the convergence of the 3D incompatible element and excellent performance in terms of accuracy and time efficiency comparing with standard linear and quadratic hexahedral elements.
Research on Optimization Method for Reuse Degree of Loader Bucket Module-Base
Authors: Chen Yan Hui , Zhou De Jian
Published: February 2012

An optimization mthod for ruse degree of lader bucket mdule-base was put forword in this paper. Tthis method first constructs the similarity matrix by calculation of similarity, then the clustering module examples to be needed can be obtained according to minimum spanning tree obtained by the matrix and by selection of the appropriate threshold value, finally the cluster center and error are calculated to determine the retained module example to ultimately achieve the purpose of reuse of the module examples. If the threshold of dissimilarity is limited to 0.96, 11 redundancy examples among 39 existing bucket module examples are eliminated to improve 39.2% of the reuse degree.
Study on Teaching Method Reform of the Professional Course in Applied Undergraduate Colleges - Take Automobile Marketing Major as an Illustration
Authors: Zhang Huai Ge
Published: February 2012

According to the teaching experience coming from the Application - oriented Higher Education, the article r analysed the question to the course of the Automobile Marketing practice and proposed the countermeasure to improve the teaching results such as teaching scene, set up the second classroom as well as strengthen the drill simulation during the teaching .
A Self-Adaptively Loading Mechanism for Planetary Cylindrical Roller Traction Drives
Authors: Chen De Sheng , Du Xue Wen
Published: February 2012

A planetary cylindrical roller traction drive was developed. It is comprised of a sun roller, three planet rollers, an outer ring, a planet carrier and an input shaft. The sun roller is hollow, and is connected through three segments of logarithmic spiral profile to the input shaft. As the input shaft rotates relative to the sun roller, a wedging action takes place between the input shaft and the sun roller; this makes the sun roller produce a certain amount of radial displacement, so an appreciable amount of normal load is thus generated between the rollers of the planetary traction-drive device. The greater the input torque is, the stronger the strength of the wedging action, and the greater the contact load, and vice versa; so this device is self-actuating. Here, as cylindrical rollers are used in the planetary traction-drive device, the spin motion as would present in the case that tapered rollers are used will not occur. This design offers an alternative way to solve the problem of self-adaptively loading of planetary cylindrical roller traction-drive devices.
Microstructure and Wear-Resistance Property of Laser Cladding Layer on GH710
Authors: Hu Bin , Hu Fang You , Huang Xu Ren , Yi De Xian , Zhao Pei Zhong , Cui Ai Yong , Lu Chang Liang , Fu Peng Fei
Published: February 2012

To repair the damages of aero blades, laser cladding on GH710 substrate using NiCrMoNb powder by CO2 laser was carried out. The microstructure and microhardness of cladding layers were investigated. The property of dry sliding friction and wear in the air was tested. It was found that the cladding layer was well combined with the substrate. The white narrow metallurgical bonding zone was about 15~20μm. The microstructure transformed from coarse columnar grains to fine dendritic grains from bottom to top and the net-like grains were fabricated on the surface. The axis of columnar grains was perpendicular to the direction of the melting line. Columnar grains had the scale of 10~15μm on the width and 50~60μm in the axis direction. The area of the crystal lattice varied from 2μm×4μm to 5μm×9μm. The microhardness of cladding layer, metallurgical bonding zone and the substrate changed gradually. The microhardness was 450HV, 40%~50% higher than that of the substrate. The wearing capacity was 50%~55% of that of the substrate. The main form of abrasion was grain-abrasion and adhesion-abrasion.
The Research on Three-Dimensional Model of Non-Circular Gear
Authors: Sun Guo Xing , Sun Chuan Qiong , Liu Qiang
Published: February 2012

According to the principles of engagement and the mathematical model of non-circular gear tooth profile, the tooth profile of non-circular gear is draw. Then the three-dimensional model of the non-circular gear is created in Pro/E three-dimensional software to provide the basis for a non-circular gear motion analysis, dynamic analysis and finite element analysis.
Study on Fatigue Strength for Axle of High Speed EMU
Authors: Zhou Ping Yu , Wu Ping Bo
Published: February 2012

In the paper, Assessment and comparison analyses of fatigue strength for different axles of CRH2, CRH3 and CRH5 EMUs are conducted by applying the European standards and Japanese standards. The wheelset models of CRH2, CRH3 and CRH5 are set up by means of the finite element method. Static and fatigue strength of the axles are analyzed as well as the influence of the interference fit between wheel and axle on the contact pressure. To get accurate simulation of the dynamic loads on axles, mathematical models of CRH2, CRH3 and CRH5 EMUs are established by using the SIMPACK software, considering the nonlinearities in the EMU vehicle systems. The simulation is carried out according to the runtime table of the EMU in Beijing-Tianjin line. Stochastic irregularities of the track are considered in the dynamic simulation and the load history acted on wheelset is obtained. Based on the NSOFT software, the fatigue life of axles is predicted by applying appropriate fatigue life prediction methods.
A Practical Synthetic Method for 7-ATCA
Authors: Gao Chun Hui , Zhang Yue , Li Wei , Jia Cheng Guo
Published: February 2012

7-ATCA is a major intermediate of Cefditoren pivoxil. Literatures reported 7-ATCA was generally synthesized by the method of sheer chemistry or combinative method of biochemistry and chemistry. Considering reduction of environmental pollution, the combinative method has more preference. We optimized the amount of sodium iodide and 4-methyl-5-thiazolaldehyde in Wittig reaction and the sorts of reagents for removing C-4 deprotection group. 7-ATCA was obtained after penicillin acylase hydrolysis of C-7 protection group in a mild condition. The structure of 7-ATCA was characterized by 1H NMR and the total yield was up to 55%.
Effect of Alkali-Activators on the Strength Development and Drying Shrinkage of Alkali-Activated Binder
Authors: Chi Mao Chieh , Chang Jiang Jhy , Huang Ran , Weng Zai Long
Published: February 2012

The purpose of this study is to investigate the effect of various contents and modulus ratios of alkali activators on strength development and drying shrinkage of alkali-activated slag pastes. Experimental results show that the alkali-modulus ratio is the key factor influencing pH value and drying shrinkage. The lower the alkali-modulus ratio is, the higher the pH value is, and the lower the drying shrinkage is. In addition, the increase of the amount of alkali-activators decreases the initial and final setting time. The compressive strength of alkali-activated slag pastes is higher than that of Portland cement paste at all ages.
Nuclear Magnetic Resonance Logging Evaluation of Natural Gas Hydrate Reservoir
Authors: Li Xin , Xiao Li Zhi , An Tian Lin
Published: February 2012

Natural gas hydrate in ocean bottom and permafrost is a great potential energy resource. Compared to fluids hydrocarbons (oil, water and gas) in conventional reservoir evaluation, natural gas hydrate exists in sedimentary formations in solid form, which should be reconsidered in its reservoir evaluation and global reserves assessment. Nuclear magnetic resonance (NMR) technique plays an important role in natural gas hydrate reservoir evaluation. The recent applications of NMR logging in natural gas hydrate reservoir evaluation including formation porosity-permeability estimation, gas hydrate saturation estimation and growth habits prediction in rock pores are introduced. Finally, the potential combination application of downhole NMR 1H relaxation and 13C spectroscopy in natural gas hydrate reservoir evaluation model is also discussed.
A Novel Hybrid Clustering Method for Multi-Attribute Decision-Making Datasets
Authors: Liu Kai Ping , Chen Wen Chin , Chang Ting Cheng
Published: February 2012

A function is proposed for descritizing and classifying the uncertain data of multi-attribute decision-making (MADM) datasets using a hybrid scheme incorporating fuzzy set theory, Rough Set (RS) theory and a modified form of the PBMF index function. The proposed MADM index function is used to extend the applicability of the single-attribute decision-making (SADM) function. The validity of the proposed MADM index function is evaluated by comparing the descritizing results obtained for a simple hypothetical function with those obtained using a SADM function and the conventional PBMF function.
Application of Specific Loudness in Active Noise Control inside Passenger Car
Authors: Wang Deng Feng , Tan Gang Ping , Chen Shu Ming , Zhang Jian Gang
Published: February 2012

Loudness which is one of the psycho-acoustic metrics is an important parameter in the model of sound quality objective evaluation. In this paper, based on two standards, two computational procedures of loudness were programmed and verified respectively, and these verified results showed that the two computational procedures are stable and reliable. Based on these characteristics of specific loudness curve, control strategy which selectively attenuates the peak values of specific loudness is proposed to solve the problem of active noise control inside vehicle. A computer simulation with this strategy is conducted and the changes of specific loudness and loudness before and after active noise control are analyzed. The results indicate that it is significant to reduce the peak values of specific loudness by using this control strategy, and then the reduction in loudness of noise is up to 1.5 sones.
Application of Synchronous Chip Seal Course in Large Bridges
Authors: Duan Dan Jun
Published: February 2012

The 5.6km long Yellow River Bridge is the control engineering of the Baoshu highway. Design documents indicate that the adhesive layer uses modified emulsified asphalt and the spray waterproof layer is over the adhesive layer. Because the Yellow River Bridge’s single-span is too large the bridge deck is too longer, the design of waterproof bonding layer s can easily lead to the early destruction of deck. Based on the careful analysis and investigation, project and the technical advisory group decided to adopt SBS modified bitumen Synchronous Chip Seal instead of modified asphalt emulsion waterproof bonding layer. And the engineering project controls the construction process to control construction effects. This method effectively solves the phenomenon of sticking wheel. After construction, the synchronization gravel seal bond strength test, the results show that average bond strength is 0.58MPa at 22 °C, greater than the standard specification’s requirement. Construction effect is good of Baoshu highway simultaneous gravel seal.
1.03μmYb: YAG Laser Crystal Production and its Property
Authors: Zhang Xue Jian , Li Chun , Gu Liang , Liu Jing He , Zou Guang Tian
Published: February 2012

In this paper, the crystal growth, ceramic preparation and performance of Yb: YAG was studied systematically. The new technics that is filling protective atmosphere in the lower vacuum has been presented firstly. The Yb: YAG laser with a dimension of Φ27mm×100mm was grown by Czochralski method to medium frequency induction heating. The performance of Yb: YAG crystal was investigated by using several measurements, such as absorption spectrum, fluorescence spectrum and so on.
The Impact of Parameters of Hyperlens with Artificially Engineered Metamaterial on Sub-Diffraction Imaging
Authors: Wang Wei Ping , Zheng Guo Xing
Published: February 2012

The imaging resolution of conventional lenses is limited by diffraction. Hyperlens taking a form of metamaterial have the ability to overcome the diffraction barrier. In this paper, the impact of structure parameters of hyperlens including the mental medium parameters ,curvature radius, layer number, and thickness of layer, on sub-diffraction imaging is simulated and analyzed. The results can be used in optimal design of hyperlens and to improve resolution of sub-diffraction imaging.
Study on the Experiment of All-Weather Solar Water Heater
Authors: Zhong Cheng Yao
Published: February 2012

All-weather solar water heater, which makes the most use of direct and indirect solar, can provide hot water in all weather. Heating at the day’s highest temperature enhances greatly the energy efficient ratio，Cooling at the day’s lowest temperature enhances greatly refrigeration coefficient to save electric energy. In summer, it is able to supply hot water and relevant cooling, avoiding heat pollution and cooling loss. In winter, it is able to supply hot water and relevant heating. The water cycle system which is adapted to store and supply of heating and cooling, reduces the area of solar collector and links of heat exchanging to reduce cost. All-weather solar water heater with advantages such as high conversion efficiency of solar energy and heat energy, initial cost, operating cost and power saving which are better than traditional solar water heater of the same volume, has a great potential for future application.
The Elastic Dynamic Analysis of Crawler Crane Boom System
Authors: Ma Lv Zhou , Liu Jian , Diao Xu Lin , Dong Mei Ling
Published: February 2012

According to mechanical characteristics of space truss structure, the dynamic characteristics of boom system of crawler crane in derricking condition are simulated based on positional FEM. FEM simplified analytical method is established basing on engineering algorithm, only a few units and small amount of calculation are needed when using variable cross-section beam to simulate boom integral structure. The dynamic response time curves of boom system in derricking conditions are obtained, and compared with the existing literature. This further confirms the simplified model is feasible in theory and easy to realize in engineering, it also shows that positional FEM is feasible in dynamic analysis of complex structure.