bluuebunny/crossref_metadata_2025 huggingface dataset:
Prioritizing Design Configurations of Vertical Grinding Machines Considering Static and Dynamic Performances
Authors: Chen Yong Liang , Wang Chao Hao , Pang Jin Ping , Zhang Da Wei , Xia Guo Li
Published: February 2011

A new method to evaluate design candidates in adaptable design of vertical grinding machines considering static and dynamic performances is introduced. According to adaptable design principles, the comprehensive evaluation method of dynamic and static performance was used to evaluate the value of structural change and performance improvement. Taking the redesign of vertical grinding machine for example, some design candidates were provided for its weak parts. Based on the evaluation method, the data on design candidates, which was derived from the static and dynamic analysis, was accurately analyzed and the design candidates were accurately and rapidly evaluated. Finally, the best configuration was selected.
A Study on Test Technology of Ship Shafting Torsional Vibration
Authors: Wen Xiao Fei , Wang Xing Di , Yuan Qiang
Published: February 2011

Ship shafting is a key component of ship power plant. Torsional vibration test for ship shafting is the essential step to ensure the safety of ship power systems. For the purpose of analyzing and comparing torsional vibration test methods, a study of the test methods, equipment and technology is carried out in this paper. Three different test methods are compared with each other by adopting two different test systems. The main propulsion and marine generator shafting torsional vibration characteristics are analyzed by using two different analysis methods respectively: the single order and resonance point method and the multi order and resonance point method. The results obtained in the process of testing on board ship may provide a good guidance for the further researches in this subject.
The Application of the Elman Network on the Vehicle Handling Stability Control
Authors: Zhou Si Jia , Long Jiang Qi , Zhao Ke Gang
Published: February 2011

In this paper, an expanded Elman network is applied to forecast the vehicle dynamic characteristic and a one step predictive control is also put into use to reinforce its handling stability. The combined control strategy is established based on the conception of the distribution of the driving force between the front and rear driving axles that can be easily achieved in an EV. Moreover, in this research, the distribution proportion of longitudinal driving force defining as a parameter is introduced and the control method of vehicle stability with the aid of the distribution proportion between axles is investigated．Simu1ations have been carried out and the results indicate that the proposed control strategies achieve smooth control effects and rapid target tracking response. This method can be easily applied to the vehicles that are driven by motors, and is capable of improving the lateral dynamic stability of vehicles in most conditions．
Synthesis Method of Heat Exchanger Network for Distillation Device
Authors: Ge Yu Lin , Wang Ping , Shen Sheng Qiang , Xu Jun Liang
Published: February 2011

Mathematical programming model for synthesis of heat exchanger network for distillation unit is established. MINLP problem for heat exchanger network is solved by branch-bound method. Two kinds of heat exchanger network with splitting stream and without splitting stream are obtained. 142 heat exchangers, 8 coolers and 4 heaters are needed in the heat exchanger network without splitting stream. 34 heat exchangers, 8 coolers, 4 heaters, 11 splitters and 11 mixers are needed in the heat exchanger network with splitting stream. The matching situation including heat load, heat exchange area, duty of utilities, flow fraction of splitting, temperature of inlet and outlet, etc. for cold and hot streams in the heat exchanger network with splitting stream is presented in detail, Analysis the relationship between total heat exchange area, total heat load, total capital cost and annual operation cost of the heat exchanger network. Taking the number of heat exchangers and operational flexibility of heat exchange network into consideration, the heat exchanger network with splitting stream is suggested to be selected.
Experimental Study of Pressure Drop and Heat Transfer of Heat Exchangers with LASH Baffles
Authors: Sun Hai Yang , Qian Cai Fu
Published: February 2011

LASH or large-and-small-hole baffle is a new kind of baffle which induces axial flow in the shell-side of heat exchangers. In this paper, pressure drop and heat transfer of heat exchangers with LASH baffles were experimentally studied and compared with those in common heat exchangers with segmental baffle. It is founded that compared with the segmental baffles, pressure drops caused by LASH baffles are greatly decreased. Although the shell-side heat transfer coefficient with the LASH baffles is decreased, more comprehensive performance for heat exchangers with LASH baffles can be achieved.
Dynamic Thermal Equilibrium Test and Analysis of the Small Gasoline Engine
Authors: Liu Chuan Bo , Liu Peng
Published: February 2011

To research the relationship between the coolant heat power and engine working conditions, and to guide the reasonable design of all heat-radiating components, an experiment method of heat balance at all operating modes was developed and implemented for a certain type of small gasoline engine. Based on the multivariate regression analysis, the correlation between the coolant thermal power and the engine rotation speed and torque was obtained. Tested by the experimental results and significant approach, the multivariate regression equations established have a high precision, and a certain theoretical and practical value for the cooling system analysis and design for small gasoline engine.
Thermal Design and Analysis of a Satellite Borne Electronic PCB
Authors: Chen Bo
Published: February 2011

Thermal design, finite element analysis of a satellite borne PCB is introduced in this paper. Some methods were adopted to help heat conduct and a simplified computing model was built. The analysis results show that the temperature scope of the main structure is from 45.5°C to 72.3°C in high temperature work case and all of junction temperatures of components are lower than the derated maximum junction temperatures themselves and leave enough design margins, which match the requirements of thermal analysis.
Macro-TG Reactor and Thermogravimetric Analysis for Cooking Oil Tar Samples
Authors: Xie Zheng Wen , Su Kai Yu
Published: February 2011

The combustible material of fire in fog discharge pipe is the cooking oil tar. Cooking oil tar was conducted on a specially designed laboratory-scale thermobalance (Macro-TG) with sample loading of 15g under dynamic air atmosphere. The effects of heating rate (5, 10, 15, 20 and 25°C/min) was examined. A simple kinetic description, named in this work as ‘First Order Reaction and Three-dimensional Diffusion Separate-stage Model (O1+D3)’ model, was developed based on the experimental results and integral analysis method. Experimental results shows that large amount of sample has a pyrolysis reaction retardancy. The distributed activation energy model was used to study the pyrolysis kinetics. Science the reaction occurred in small activation energy told us that if the cooking oil tar put on fire it will be spread rapidly and hard to put out.
Extinction Thread to Infrared Lensdissipation Stray Light Research
Authors: Wang Guo Dong , Zhang Yu
Published: February 2011

In the infrared optical system ，due to the special infrared imaging system, the stray can have the very tremendous influence to the image formation，this article utilizes the SolidWorks 3D design software design, and use the extinction thread ZEMAX optical analysis software on the extinction of a thread, the infrared lenses for analysis, through theoretical and practical study proves that extinction thread on infrared system weakened noticeably stray light radiation, infrared imaging have a beneficial effect. On the future of weakening the stray light offers a new method.
A Heat Transfer Model of Dropwise Condensation Underneath a Horizontal Substrate
Authors: Chen Yun Fu
Published: February 2011

For finding influence of the condensing surface to dropwise condensation heat transfer, a fractal model for dropwise condensation heat transfer has been established based on the self-similarity characteristics of droplet growth at various magnifications on condensing surfaces with considering influence of contact angle to heat transfer. It has been shown based on the proposed fractal model that the area fraction of drops decreases with contact angle increase under the same sub-cooled temperature; Varying the contact angle changes the drop distribution; higher the contact angle, lower the departing droplet size and large number density of small droplets; dropwise condensation translates easily to the filmwise condensation at the small contact angle ;the heat flux increases with the sub-cooled temperature increases, and the greater of contact angle, the more heat flux increases slowly.
Innovation Design in Machine Theory for Mechanical Engineering Education
Authors: Qiang Jian Guo
Published: February 2011

Training of basic quality and ability of students is always a primary goal for the higher mechanical engineering education, innovation design practice in machine theory are very important method to train the basic quality and ability, independent of thinking, the spirit of cooperation of students. In the innovation design practice, the subjects generally come from three sources, the students should be grouped freely and every group is not less than three people and not more than five people. At the same time, the basic content of investigation report and feasibility report are introduced, an example of innovation design practice scheduling used for years and some questions which should be paid special attention are also provided.
Reform of Mechanics Education Based on the Network Teaching and Competition
Authors: Liu Jun
Published: February 2011

As a specialized base course of mechanical engineering specialty, study of mechanics course plays an important role of bridge to study other specialized courses. Students who learns mechanical course better will be usually quite smoothly in their successor curriculum studies. Not only does it influence the studies of specialized curriculum, course design, graduation design, etc, but also their employment in the future directly. It is the duty of the teachers to improve quality of teaching mechanical courses and enhance students' various abilities. In this paper, introduces how to improve students’ abilities relying on two platforms of the network and competition during the teaching.
Construction and Practice of the Advanced Manufacturing Engineering Training Platform Based on Network
Authors: Lv Ru Jin , Liu Jian Wei
Published: February 2011

In order to meet the development of advanced manufacturing technology, based on the requirement of engineering training in colleges in the new period, the advanced manufacturing engineering training platform is established. In this paper, the authors introduce in details the framework and function, analyze how to run the platform, and then, sum up its application of numerical control manufacturing in practice.
Cost Accounting Game Model for Education and Operating Method
Authors: Cho Heung Jae , Park Jae Il
Published: February 2011

This research suggests a game model for companies who have difficulty in implementing cost accounting system, also, for the companies that do not have cost accounting system. This cost accounting game includes main game board, sub game board and each division board which has a magnetic character, so it could be moved flexibly. By using this game, every company can design their own cost accounting system. Furthermore, this game has account book, so that every player can obtain the best ability of calculating production cost.
Analysis on Mode of Practical Teaching Link in Innovative Engineering Master Education
Authors: Zhai Xiao Wei
Published: February 2011

In this paper, aiming at the practical problem that practice capability of our advanced engineering elite can’t satisfy company demand, the position and function of practical capability cultivation in the innovative engineering master cultivation process was emphasized, demanding that the engineering students should have organization ability, programming ability, general application ability and relearn ability, besides firm and abundant special basic knowledge, practical teaching link was proposed, main content of which were experiment, science research and scholarly activities, at the same time, to ensure that this practical link can be carried out, it was necessary to enlarge teachers team construction and build experiment flat.
Management of Industrial Clusters: a Focus on SMEs
Authors: Zeinalnezhad Masoomeh , Sahran Shahnorbanun , Mukhtar Muriati
Published: February 2011

The purpose of this paper is to contribute to the management and benchmarking methodology at the small and medium enterprise level jointed to industrial cluster. As emerged from this literature review, there has been almost nothing done in this context, however, the currency of benchmarking models for individual SMEs needs an innovative transformation to adhere to the dynamics of the business environment. As well, it has observed that benchmarking methodologies should focus on analyzing forward looking, predictive and future performance comparisons rather than static ones. This study finds that entering into cooperative relations with other SMEs and related partner institutions, SMEs will overcome their size limitations as well as improving their productivity, innovativeness and overall. Hence to compete successfully in the domestic and global markets, SMEs need an appropriate benchmarking model suitable for their new improved environment within clusters.
Application of Entropy Weight Technique in Grey Relational Analysis for Scheme Optimization of Sewage Treatment Plant
Authors: Cheng Yong Qian , Ma Hong Mei
Published: February 2011

In this paper, an attempt has been made to apply an efficient technique, in order to solve the uncertainty of multi-objective optimization, in the field of sewage treatment plant. The traditional grey relational analysis has been extended to deal with the multi-objective optimization problems. The difficulty of traditional grey relational analysis exists in calculation of the multiple indicators and ignorance of the relationship among evaluating indicators. But there is no specific guideline for assigning these indicator weights. In this context, the present study aims to apply the entropy measurement technique in order to determine the weights of evaluating indicators, which avoids the subjectivity in the process of estimating the weights. The proposed method involves four steps, including 1) original data processing, 2) grey relational coefficients calculation, 3) indicator weight calculation, and 4) grey relation grade calculations. The previously mentioned method has been applied to optimize schemes of a sewage treatment plant. The paper demonstrates a detailed methodology of the proposed technique as well as its effectiveness and applicability.
The Study on Crystallization Kinetics of Glass-Ceramics Containing Rare-Earth Tailings by DSC
Authors: Zhao Tuan , Wei Kai Ming , Gao Zhan Yong , Li Bao Wei , Cang Da Qiang
Published: February 2011

The crystallization kinetics of glass-ceramics containing rare-earth tailings have been determined using non-isothermal DSC. The kinetic parameters for as-quenched and nucleated samples are reported and discussed.The results showed that glass-ceramics with optimal bending strength about 200MPa can be obtained under the condition of nucleating at 730°C for 2h.
Design of a Novel TiO2 Thin Film Device
Authors: Teng Hsien Chiao , Yeh Anchi , Hu Jhih Wei , Cheng Yuan Tung , Cherng Shen , Hung Yu Jung
Published: February 2011

Coating TiO2 thin film with the thickness of 50 nm and the planar size of 6×6 mm2 onto a dual band meander-planar patch radiator being printed on a FR4 substrate (relative permittivity εr= 4.4) by the size of 0.4×7×33.5mm3 is demonstrated in this report. The system is for the application of 2.4/5.2 GHz WLAN (Wireless Local Area Network) dual-band operation. Experimentally, the radiation gain was increased about 30% when part of the radiator governing the lower band coated with TiO2 thin film. It is thus revealed the TiO2 thin film can be a functional device to tune the radiation gain for the patch radiator.
The Effect of Fiber Constitution and Beating Process on Surface Strength of Packing Paper
Authors: Zhao Hong , Qi Lin , Du Fei , Yu Chang Jiang
Published: February 2011

This article studied on these factors which influences the surface strength of packing paper. Through a series of tests, a model has been found. This model could guide the adjustment about fiber composition and beating process. And then a pilot scale test about this model has been carried out in Henan. The conclusion indicated that surface strength, printability and other strength indexes have been improved by adjustment of fiber composition and beating process scientifically. The ratio of softwood pulp has been reduced from 28% to 23%~25%. And the surface strength has been increased from 0.8~1.2m/s to 1.5~1.8m/s. Furthermore, when the ratio of softwood pulp is 23% and chemical-mechancial pulp is 7%, the packing paper still has a good printability.
Research and Design of Small-Engine LPG Motorcycle Fuel System
Authors: Ji Rui Hai , Duan Ming De , Li Cun Xia , Liu Xin
Published: February 2011

By the analysis and comparison of LPG motorcycle and LPG automobile, the similarities and differences of them are expounded. Based on the components and structure of LPG automobile fuel system, the LPG motorcycle gas phase positive pressure fuel system and LPG motorcycle liquid phase positive pressure fuel system are designed, and the advantages and disadvantages are analyzed and compared. The engine cylinder cover is enhanced and setted maze channels, so the liquid state LPG can be pre-heated using the remaind head of engine before enter the decompressor, the frozen of decompressor is solved effectively. The road trial and testing show that the LPG motorcycle liquid positive pressure fuel system is simple in structure, stabilize and reliable, the comprehensive performance can satisfied the demand of national standard.
Effect of Chitosan Biguanidine Hydrochloride on Textile Properties of Antheraea Pernyi Silk
Authors: Lu Yan Hua , Song Ming Su
Published: February 2011

In order to improve the water-solubility of chitosan, chitosan biguanidine hydrochloride was synthesized by modified chitosan with dicyandiamide in the presence of hydrochloric acid. The guanidinylation chitosan was then applied to Antheraea pernyi (A. pernyi) silk fabric in the presence of 1,2,3,4-butane tetracarboxylic acid with sodium hypophosphite as catalyst. Studies on the effect of chitosan biguanidine hydrochloride treatment on morphology and textile properties of A. pernyi silk fiber and fabric have been conducted. The changes in the morphological structure have been monitored by scanning electron microscope. The changes in some of textile properties including wrinkle recovery angles and bacterial reduction owing to the treatment have also been investigated. It has been found that the surface of A. pernyi silk gets rough. The wrinkle-resistant performance improved, and the antibacterial activity of the treated A. pernyi silk fabric against E. coli was more than 99%.
Research of Temperature Field Simulation on Electrode Wire Wear for WEDM
Authors: Li Chao Jiang , Bai Ji Cheng , Guo Yong Feng , Lu Ze Sheng , Ma Wei
Published: February 2011

The wire electrical discharge machining (WEDM) technology is widely used in the field of mold industry, aerospace, automobile and so on. However, in the discharge machining, the electrode wire wear will affect the machining accuracy and machining efficiency. There are many factors that affect the electrode wire wear, and cutting many work-piece and precise surveying are needed in the wear experiment, so the whole experiment is complex. This article analyzed the wear mechanism and found the main reason of affect the electrode wire wear by using the ANSYS software to do the temperature field simulation. The simulation parameters and simulation results were verified through experiments. The experiment showed that appropriate ratio of peak current and pulse width and the slow current rise slope can reduce the electrode wire wear significantly.
Features and Technology of Piezoelectric Hydrophone
Authors: Wang Qiu Ping , Liu Rui Cong , Cheng Peng Fei , Feng Fei Long , Jiang Xue Fang , Liu Han Chen
Published: February 2011

A piezoelectric hydrophone is design and made with Pb(Zr,Ti)O3 ceramic. The technology is presented and its impedance characteristics and directivity are researched. Experimental result manifests its usability of the hydrophone.
A Novel Method for Sheet Formation of Porous Spray Deposited Al-Fe-V-Si Alloy Reinforced with SiC Particles
Authors: He Yi Qiang , Wang Na , Chen Zhen Hua
Published: February 2011

Processes of rolling after wedge pressing and extruding for multi-layer spray deposited Al-Fe-V-Si/SiCP sheet formation were described in this paper, and the effects of the two different processes on the microstructure and mechanical properties of the composite were investigated. The microstructure of the composite prepared by different processes was observed by OM, SEM, and TEM. The experimental results show that the wedge pressing process can obviously eliminate the pores in the as-deposited preforms and improve the formability effectively. And more uniform microstructure and more excellent mechanical properties of the compositesheets were obtained by rolling after wedge pressing than that by extruding. The excellent mechanical properties can be attributed to avoiding of SiC particles lamination and aggregation which are familiar to the composite as-extruded. Stable microstructure, and good bonding between SiC particles and the matrix improve its mechanical properties further.
Step Vibration Drilling for Micro Inclined Hole
Authors: Zhang Peng , Guo Xing Yu , Zhang De Yuan
Published: February 2011

In modern manufacturing industry, there are a great deal of micro inclined holes, which is a difficult problem to machining. A novel micro inclined hole drilling method, step vibration drilling, is adopted. The experiments are carried that 45 degrees inclined hole is drilled into the 45 steel workpiece with Φ0.5mm carbide drill bit. The notable result was obtained with the method of step vibration drilling for drilling 45 degrees inclined holes on 45 steel, which break the restriction of drill jig. The new approach is put forward for micro inclined hole.
Research on Hot-Rolling Technics of a Nickel-Based Corrosion Resistant Alloy
Authors: Li Yan Fang
Published: February 2011

To improve the hot-rolled processing rate and mechanical properties of Monel alloy plates, its hot-rolling and heat treatment technics were researched, and reasonable hot-rolling temperature and annealing temperature were designed. Through the hot-rolling tests of Monel alloy plates ingots under the condition of different temperatures with a hot-rolling mill, the true stress and true strain curves were measured, the regularity of the flow stress influenced by temperature was investigated, and the hot-rolling temperature was ensured. We also did some study on the effects of annealing temperature on the mechanical properties and metallographs. The results show the reasonable hot-rolling temperature of Monel alloy plates ranges between 1050°C and 1150°C, and its annealing temperature ranges between 650°C and 750°C.
The Finite Element Analysis and Optimal Design to Inverted Umbrella Aerator
Authors: Xing Pu , Zhao Jing Yun , Yin Xiu Jie
Published: February 2011

The inverted umbrella aerator is the key equipment of biological wastewater treatment technology, which have the effects of oxygenation, mixing and plug-flow. the design and optimization of the mixing impeller is most important to the efficiency of oxygenation.In this paper, the solid modeling and finite element analysis and optimal design of aerator blades was made based on the study of the oxygenation mechanism.Firstly, the working process of the blades have been studied through solid modeling, mesh generation and finite element analysis process, and the stress-strain finite element analysis was offered based on Nastran, which identified the weak links in the leaves. And more, the optimize and improve designs for the production was made,which set the foundation for the manufacture of the blades.
On the Deep Small Hole Machining Method of Nickel-Based High-Temperature Alloy
Authors: Di Shi Chun , Li Zhao Long , Wei Dong Bo
Published: February 2011

In this paper, a machining method of deep hole on the nickel-based high-temperature alloy using the pulse electrochemical machining is proposed. The effect of five technological parameters on the depth-averaged radial overcut of the hole to be machined in the machining process is discussed; then the mathematical model is built, and the effect of parameters on the overcut is illustrated. The speed ratio is determined to judge the quality and the processing performance of holes. The technological parameters adopted in the experiment, can be used to produce effectively high-quality hole of big proportion of depth to diameter on the nickel-based high-temperature alloy in the machining process.
Determination of the Weights of Evaluation Indices with Combined Weighting Model for Engineering Materials
Authors: Zhang Tian Yun , Chen Kui
Published: February 2011

Combined Weighting Model (CWM), a new model combining entropy method, analytic hierarchy process (AHP) and back propagation network (BPN) is discussed to determine the weights(the key parameter of comprehensive evaluation) of evaluation indices(properties) for engineering materials in this paper. Taking the selection of bearing materials as an example, the combined weights of nine kinds of evaluation indices for ten kinds of candidate materials were calculated using CWM. According to these weights, candidate bearing materials were evaluated using Technique for Order Preference by Similarity to Ideal Solution (TOPSIS). The result shows that the optimal bearing material is agreed with engineering application, which means the weights obtained from CWM are reasonable and reliable, and CWM is an effective method to determine the weights of evaluation indices for engineering materials.
A Methodological Study of the Enhancement of the Bid Success Probability for the Bidder
Authors: Chen Guo Yuan , Chang Tao
Published: February 2011

With the increasing competition in the construction market, particularly in the present situation of financial crisis, how to win the bid of the project and gain some profit becomes decisive for the bidder while the tender offer is the key factor to win the bid. Based on the analysis of the method of how the bidder determine the tender offer, the paper summarizes the ways of considerably enhance the bid success probability, including attaching importance to the working scheme, properly determining the “cost” of the engineering project and the requirements for the expected payoff, and tender-making upon the study of the competitors. Conclusion references are provided for the bidder’ tender-making.
In-Process Monitoring and Prediction of Surface Roughness in CNC Turning Process
Authors: Tangjitsitcharoen Somkiat
Published: February 2011

The objective of this research is to propose a practical model to predict the in-process surface roughness during the turning process by using the cutting force ratio. The proposed in-process surface roughness model is developed based on the experimentally obtain result by employing the exponential function with six factors of the cutting speed, the feed rate, the rank angle the tool nose radius, the depth of cut, and the cutting force ratio. The multiple regression analysis is utilized to calculate the regression coefficients with the use of the least square method. The prediction accuracy of the in-process surface roughness model has been verified to monitor the in-process predicted surface roughness at 95% confident level. All those parameters have their own characteristics to the arithmetic surface roughness and the surface roughness. It has been proved by the cutting tests that the proposed and developed in-process surface roughness model can be used to predict the in-process surface roughness by utilizing the cutting force ratio with the highly acceptable prediction accuracy.
Effect of Surface Free Energy and Electrochemical Polarization on Attachment of Sulfate Reducing Bacteria
Authors: Duan Dong Xia , Lin Cun Guo
Published: February 2011

Sulfate reducing bacteria (SRB) were most common bacteria involved in microbiologically influenced corrosion (MIC). In this paper, the influences of surface free energy and electrochemical polarization on sulfate reducing bacteria (SRB) attachment were investigated. Microbial adhesive to hydrocarbons experiment and zeta potential test showed that SRB were relative hydrophobic and were negative charged. SRB showed affinity to substratum with higher water contact angle and its biofilm formation led to alterations in the hydrophocibity of the substratum surface. The mild steel was used to systematically examine the effect of electrochemical polarization on SRB attachment. At -800mV (vs.SCE), the sessile number was similar to those without polarization. At -950mV and -1000mV, the polarization promoted SRB attachment. At -1100mV and -1200mV, the adhered cell number decreased sharply compared to those at -1000mV. SRB attachment was inhibited, at an applied potential of -1300mV. These results indicated that the infuence of negative polarization on SRB attachment was dependent on applied potential.
Light-Colored and Organosoluble Fluorinated Polyimide Derived from 1,2,3,4-Cyclobutanetrtracarboxylic Dianhydride
Authors: Lu Yun Hua , Hu Zhi Zhi , Fang Qing Xu , Wang Yong Fei
Published: February 2011

The alicyclic dianhydrides 1,2,3,4-cyclobutanetrtracarboxylic dianhydride was polymerized with four kinds of fluorinated aromatic diamine, 1,4-bis(4-amino-2-trifluoromethyl phenoxy)diphenyl, 1,4-bis(4-amino-2-trifluoromethylphenoxy) diphenyl ether, 2,2-bis[4-(4- aminophenoxy)phenyl]hexafluoropropane and 2,2-bis[4-(4-amino-2-trifluoromethylphenoxy) phenyl]sulfone respectively, via a two-step polycondensation procedure to prepare four series of fluorinated polyimides(PIs). The PI films exhibited high optical transparency in the visible light region(400-700nm) with the transmittance higher than 80% at 450nm. Especially, the PI-III containing four CF3 group showed the best optical transparency with the transmittance higher than 84.61%. And the PI films showed little absorption at the optocommunication wavelengths of 1.30µm and 1.55µm. In addition, these PIs were soluble in amide-type solvent, even in less polar solvent. The effect of internal linkage group of fluorinated diamine on the solubility of PIs was similar.
Research of Micro Free-Piston Engine Generator Performance
Authors: Wang Qian , Yang Jin Hua , Bai Jin , Chen Jun Jie , Chen Ze
Published: February 2011

Based on the operating characteristics of a micro HCCI (Homogeneous Charge Compress Ignition) free-piston engine, a multidimensional model which coupled CFD code, chemical dynamic model and piston dynamic model has been established. Using this model, an ignition and combustion process of the micro engine is simulated, the cylinder pressure and temperature profiles are obtained, and the influence of leakage and heat lost on micro engine combustion process is analyzed. Meanwhile, working characteristics of micro engine generator are evaluated by employing the simulation result. Power, combustion efficiency, etc of the micro engine are obtained. Lastly, the micro engine working characteristics with different load, fuel and piston mass are compared and effects of those varying conditions on engine performance are investigated. Simulation result provides essential requirements for micro free-piston engine control and design.
Curved Layer Fused Deposition Modeling in Conductive Polymer Additive Manufacturing
Authors: Diegel Olaf , Singamneni Sarat , Huang Ben , Gibson Ian
Published: February 2011

This paper describes a curved-layer additive manufacturing technology that has the potential to print plastic components with integral conductive polymer electronic circuits. Researchers at AUT University in New Zealand and the National University of Singapore have developed a novel Fused Deposition Modeling (FDM) process in which the layers of material that make up the part are deposited as curved layers instead of the conventional flat layers. This technology opens up possibilities of building curved plastic parts that have conductive electronic tracks and components printed as an integral part of the plastic component, thereby eliminating printed circuit boards and wiring. It is not possible to do this with existing flat-layer additive manufacturing technologies as the continuity of a circuit could be interrupted between the layers. With curved-layer fused deposition modeling (CLFDM) this problem is removed as continuous filaments in 3 dimensions can be produced, allowing for continuous conductive circuits.
Research on Dynamical Model of Horizontally Vibrating Conveyor
Authors: He Yu Min , Liu Qiang , Lin Yun , Zhang Xiao Long
Published: February 2011

The horizontally vibrating conveyor (HVC) is excited by a exciting implement with four shafts which have eccentric quality, and the materiel is transported by the friction between the materiel and conveying trough. The friction force varies continuously in the process of material transportion. To solve the problem, a dynamical model of HVC is set up, and an adaptive method based on the discreteness of time is presented. Then the transportation theory is discussed.
Rigid-Flexible Coupling Dynamics of a Flexible Robot with Impact
Authors: Duan Yue Chen , Zhang Ding Guo
Published: February 2011

The rigid-flexible coupling dynamics of a radially rotating flexible beam with impact is investigated in this paper. The transversal deformation and nonlinear coupled deformation, which means the longitudinal shortening caused by transversal deformation, is considered here. The impact force is calculated based on Hertz contact theory and nonlinear damping theory. By introducing the concept of impact potential energy, the system’s rigid-flexible coupling dynamic equations with impact is obtained by using Lagrange equation. The dynamic simulation is given to validate the method presented here, and get some dynamic response, such as impact force and flexible deformation.
Modeling Minimum Cutting Velocity of a Cut-Clamp Combined Litchi Picker
Authors: Liu Tian Hu
Published: February 2011

A mechanical litchi picking process using a cut-clamp combined picker was modeled. A minimum clamping velocity model is required to ensure such a picker working reliably as well as to limit consumed energy. The picking process was sub-divided into seven stages. Three variables, namely the width of fiction head (D), the press on the clamping head(N) and fiction index between fruit branch( μk (v)) were chosen as independent variables. The output of modeling is the minimum cutting (or clamping) velocity. The model was verified using the experimental results of cutting and clamping by a simulated cut-clamp combined picker. The experimental results also showed if setting safety factor k=1.5, calculated velocities can ensure fruit branch be clamped firmly by the cut-clamp combined picker.
BP Neural Network in Prediction of the Constant-Current Hydrostatic Bearing Static Stiffness
Authors: Tang Jun , Huang Xiao Diao , Fang Cheng Gang
Published: February 2011

SKZT3500 NC rotary table adopts constant-current hydrostatic bearing and unloading guide two sets of hydraulic system. Aiming at the characteristics of two sets of hydraulic system, this paper deduces the constant-current hydrostatic bearing static stiffness formula. Then, the theory and algorithm of BP neural network were applied to predict the constant-current hydrostatic bearing static stiffness, based on experimental measurements in a physical prototype and neural network toolbox of MATLAB. Testing results show that BP neural network can accurately forecast the constant-current hydrostatic bearing of the static stiffness.
Research on Planet Crumb-Free CNC Pipe-Cutting Machine Mechanical Parameters
Authors: Tao Ke , Li Xu , Zhang Xin Yu
Published: February 2011

According to the actual production of large diameter pipe cutting presents a difficult problem planetary debris-free pipe cutting methods, design sketch of the entire system drive, cutter parameters are given, and deduced pipe cutting machine Motor and feed motor of the kinetic parameters for practical application provides a feasible solution.
Analysis of Isometric Modification of Spur Bevel Gear
Authors: Cui Huan Yong , Yang Dong , Tian Xi Jie , Men Xiu Hua
Published: February 2011

Isometric modification, as a new modification method of spur bevel gear was proposed. Based on the gear geometry theory and the normal meshing motion equation of gear pairs, changes of meshing points and angles are analyzed and the effect of axial modification on gear pair meshing movement is discussed, and then dynamics emulation analysis was operated with FEA software, the results show that the stress distribution of gear surface was controlled by isometric modification, the load concentration, agglutination and pitting of the gear can be avoided effectively.
E-Bayesian Estimation Method and its Applications in Reliability Engineering
Authors: Han Ming
Published: February 2011

Evaluation method of reliability of industrial products needs to be improved effectively with the advance of science and technology. This paper introduces a new method, named E-Bayesian estimation method, to estimate failure probability in reliability engineering. The definition of E-Bayesian estimation of the failure probability is provided, moreover, the formulas of E-Bayesian estimation and hierarchical Bayesian estimation of the failure probability were provided, and properties of the E-Bayesian estimation, i.e. relations between E-Bayesian estimation and hierarchical Bayesian estimation, are also provided. Finally, calculation on practical problems shows that the provided method is feasible and easy to perform.
Performance Analysis of Auto-Control Adjustable Speed Asynchronous Disk Magnetic Coupling
Authors: Yang Chao Jun , Ni Zhi Jiang , Zheng Wu
Published: February 2011

Auto-control adjustable speed asynchronous magnetic coupling was designed according to principles of electromagnetic induction. Its development can effectively solved the vibration leading to the damage of mechanical coupling and the surrounding parts caused by rigid mechanical coupling link, as well as realized motor soft starting by controlling output speed in different torques. Based on the above working requirement, a novel magnetic coupling structure suit for auto-control by PLC in this paper was created. The motive simulation analysis of body structure and the simulation of magnetic torque at different air-gap length were obtained separately by ADAMS and ANSOFT. The results showed that the structure of auto-control adjustable speed asynchronous disk magnetic coupling was reasonable in practical condition.
Kinematics and Dynamics Analysis of the Lifting System of a Welding and Tube-Transferring Car for Deepwater Pipe-Laying Vessels
Authors: Ma Yi Lai , Lin Li , Liu Xian Wen
Published: February 2011

The tube-transferring car is a key part of transportation system for deepwater pipe-laying vessels. This paper covers the design of a tube-transferring car for deep sea pipe-laying, especially its lifting mechanism. Kinematics and dynamics analysis of the lifting mechanism is conducted. During dynamic analysis and calculation, the single degree of freedom mechanical system dynamic analysis method is used. The results show that the rotation angle of the lifting system has a direct impact on the lifting speed and driving force. The support reaction force in each kinematic pair which is calculated by choosing the single degree of freedom dynamics provides a theoretical basis for the design of the lifting mechanism, which is finally reflected in the selection of horizontal drive of the feeding machine and the related parameter design．
Software Development of Steady Numerical Computational Method of Matching between Hydrodynamic Torque Converter and Engine
Authors: Cui Hong Wei , Wei Wei , Yan Qing Dong
Published: February 2011

In order to calculate the cooperating characteristic of engine and hydrodynamic torque converter stably and accurately, obtain the best matching of hydrodynamic machine, based on the best matching principles of dynamic and economy, a kind of numerical computational method was put forward. Accuracy of intersection point calculation could be controlled by set step size of torque and rotational speed. The problem of multiple roots and instability of intersection point calculation could be avoided. Based on the graphical user interface (GUI) of MATLAB, the program was completed for matching and the graphs were plotted automatically. By this method, any hydrodynamic torque converter and engine with given performance, input and output cooperating characteristic could be derived accurately, rapidly and stably.
A Study on the Development of the Korean Gauge-Adjustable Wheelset System for Freight Train
Authors: Kim Chul Su , Kang Gil Hyun , Jang Seung Ho
Published: February 2011

To reduce the cost and the time of transport in Eurasian railroad networks such as TKR(Trans-Korea Railway), TCR(Trans-China Railway) and TSR(Trans-Siberia Railway) owing to the problem of different track gauges (narrow/standard/broad gauge), it is important to develop the gauge-adjustable wheelset (GAW) system to adapt easily to these gauges. The GAW system in the transcontinental railway represents a more effective way in comparison with other techniques for overcoming difference in track gauges. Freight trains having the GAW system will be passing various curved tracks in railroad networks. In this study, it was performed to evaluate contact stress and fatigue life of locking parts during freight trains' service in the curved track, respectively. Moreover, the safety of Korean GAW system at running track was verified by rig tests according to UIC 510-4 code.
The Determination and Simulation for the Dead Zone of Opening/Closing Mechanism in the Bottom Door of the Railway Freight Cars
Authors: Wan Chao Yan , Liu Ying , Li Xiao Feng
Published: February 2011

A new method on determining the dead zone of the bottom door mechanism is proposed in the premise of considering the friction. This method can ensure the bottom doors of the railway cars with the self-unloading coal hoppers to realize the prescriptive mechanical action accurately, timely, and coordinately. The effectiveness of the theoretical analysis results is verified by the computer simulation. This research provides the necessary theoretical reference not only for the application and maintenance of the existing bottom door mechanism, but also for the design, analysis and forecast of the new mechanism. It also lays the base for the motion reliability analysis of the mechanism.
A Novel Algorithm for Enumeration of the Planetary Gear Train Based on Graph Theory
Authors: Ma Ming Yue , Xu Xiang Yang
Published: February 2011

As well known, graph theory is a powerful tool for mechanism design. The enumeration of planet gear trains can be converted the synthesis of graphs while a planetary gear train is converted to a graph. During the enumeration of graphs, the problem of isomorphism should be solved. This paper proposes a novel algorithm used to generate non-isomorphism graphs and thereby omits the part of isomorphism detection. The vertex characteristic is firstly defined in this paper that is the core of the enumeration algorithm. This paper also gives an example of the application for the algorithm.
Research on Elastohydrodynamic Lubrication Theory of Rolling Bearing Type Planetary Friction Transmission Mechanism
Authors: Liu Yuan Tao , Zhao Jin Zhi
Published: February 2011

Elastohydrodynamic lubrication theory is adopted in rolling bearing type planetary friction transmission mechanism in this paper. Operation performance and using life-span are improved. Minimal oil film thickness formula is deduced based on the elastohydrodynamic lubrication theory. Relationship curve between minimal oil film thickness and rotate speed is presented. Variation law between minimal oil film thickness and work parameters is given.
The Systematic Design of Multi-Speed Internal Gear Hub for a Bicycle
Authors: Hsieh Long Chang , Chen Tzu Hsia
Published: February 2011

The bicycle is invented so far more than 200 years. Now, bicycles are used as exercising equipments and traffic vehicles. Planetary gear trains can be used as the transmission systems with multi-speed for bicycles. The purpose of this work is to propose a design methodology for the design of multi-speed internal gear hubs with planetary gear trains for bicycles. Based on the concept of train value equation and the kinematic relationship of the members between the train circuit, we propose a design methodology for the kinematic design of multi-speed gear hubs. One multi-speed internal gear hubs is designed to illustrate the design methodology. Based on the proposed methodology, all multi-speed gear hubs with planetary gear trains can be synthesized.
Time-Dependent Reliability-Based Robust Optimization Design of Components Structure
Authors: Wang Bao Yan , Wang Xin Gang , Zhu Li Sha , Lu Hao
Published: February 2011

Time-dependent reliability sensitivity design is discussed based on time-dependent reliability model, combining reliability optimization design theory and time-dependent reliability sensitivity analysis method, a problem on time-dependent reliability-based robust optimization design of components structure is studied, and a numerical method for reliability-based robust optimization design is also presented. The time-dependent reliability sensitivity is added to the reliability-based optimization design model and the reliability-based robust optimization design is described as a multi-objection optimization.
Estimation of Fatigue Life for Hydraulic Excavator Boom under All Operating States
Authors: Ding Qing Xin , Tian Ying Cheng , Chen Juan , Chen Jian Wen , Hui Kun Liang , Yin Hai Wen
Published: February 2011

Fatigue is one of the most common failure mode in hydraulic excavator boom. To find the most fatigue dangerous operating state of boom and effectively improve the life of the structure, a new method is proposed for the estimation of fatigue life under all operation states. In the case of unknown the history of loading, firstly find out the hinged support force under all boom poses, then calculate the stress of every point of the boom under the actions of each group hinged support force via finite element method, and finally simulate all operating states through the poses combination, conducts analysis of multiaxial fatigue life in the maximum principal stress as the nominal stress, calculates the life and the most dangerous operating state in all points, and compares to obtain the most dangerous position and the life of the boom. The results of contrast analysis showed that: the most dangerous zone of the excavator boom calculated by the life estimation method of all operating states coincide with the actual destruction situation. The life of the structure can be greatly improved after a simple reasonable improvement of the parts.