bluuebunny/crossref_metadata_2025 huggingface dataset:
Application of Probabilistic Distribution Matching PATC on Robust Multi-Scale Design
Authors: Sun Gao Rong
Published: February 2012

Multiscale design dealing with a 2-scale material and product system is implemented by employing the probabilistic distribution matching probabilistic analytical target cascading method (PATC-PCE) in this paper. PATC-PCE allows design autonomy at each scale subsystem by formulating the multiscale design system as a multilevel design structure. The probabilistic distribution matching strategy in PATC-PCE can quantify the stochastic interrelated responses accurately enough. Comparative study on a multiscale bracket design problem shows that the results obtained by our method are very close to the benchmark values. PATC-PCE is demonstrated to be highly effective and applicable on multi-scale design.
Experimental Study on the Seismic Performance of Steel Frame with Reinforced Beam Ends
Authors: Wang Yu Tian , Jiang Fu Xiang , Wang Yan , Du Xiu Li
Published: February 2012

A single-span and two-story frame specimen with reinforced beam ends has been tested under low-frequency cyclic loading. Based on the test results, the failure patterns, hysteretic behaviors, energy dissipation and deformation ability were analyzed. The results showed that the failure mode of the test specimen was ductility. Plastic hinges appeared at the changing point of the beam cross section far away from the beam-column joint. Hysteretic curve of the frame was full and the whole ductility coefficient was enough higher than 4.4 under horizontal low-cyclic loading. It can be concluded that the energy dissipation and the deformation ability are both better. So the whole steel frame connected with reinforced beam ends has good seismic performance. And the requirements of anti-seismic ability can be satisfied.
The Study of Three-Phase Numerical Simulation of Molten Bath in EAF Impinged by Supersonic Oxygen Jet
Authors: Chen Shao Chun , Zhu Rong , Li Jing She , He Chun Lai
Published: February 2012

By Fluent 6.3, develop a mathematical model of three-dimensional and three-phase flow in the molten bath of EAF with side accessorial oxygen lance to study the transient phenomena of jet impingement on the molten steel and the molten slag. The simulation result shows, the impingement of the supersonic oxygen jet will cause flow of molten steel and the molten slag by inspiring wave of the molten bath surface from the impinged hollow centre to the bath centre, and will cause vortexes under bath which become the centre of molten steel circumfluence. The velocity of flowing molten steel under the oxygen lance or around furnace wall will be faster than that at the center of bath. With oxygen jet enhance, the frequency of the molten bath surface wave will increase, and the center of vortexes will be more apart from the impingement point of jet and will be lower to the bottom of bath, the number of vortexes will increase and the effect of impingement on molten steel will increase accordingly.
Corrosion Behavior of (Zr51.6Cu48.4)93Al7 Bulk Metallic Glass
Authors: Chen Tie Jun
Published: February 2012

Corrosion behavior of (Zr51.6Cu48.4)93Al7bulk metallic glass in 3 M HCl, 3M H2SO4, 3M HNO3, 3M NaOH and 3.5 mass%(0.6M)NaCl solutions was studied by immersion test and electrochemical measurements. The bulk metallic glass was spontaneously passivated in the acids，alkali and brine, although it exhibits distinct spontaneous passivation with high passive current density in the Cl-containing solutions. The immersion test indicated, except for 3 M HCl solution, low corrosion rates of the order of 10-2 mm/year for (Zr51.6Cu48.4)93Al7bulk metallic glass in the other solutions, The quantitative X-ray energy disperse spectroscopy(EDS) analysis revealed that the high corrosion resistance of the bulk metallic glass was due to the formation of aluminium and zirconium-enriched passive film. Corrosion products were mainly copper chloride and oxides in the Cl-containing solutions . The growth mechanism of the passive film is also discussed.
3D-Multi Constrained Heterogeneous Packing Using Genetic Approach
Authors: Kanna Rajesh , Malliga P. , Sarukesi K.
Published: February 2012

This paper presents a combination of Genetic Algorithm (GA) and Tuning algorithm, for optimizing Three Dimensional (3D) arbitrary sized heterogeneous box packing into a container, by considering practical constraints facing in the logistics industries. Objective of this research is to pack four different shapes of boxes of varying sizes into a container of standard dimension, without violating various practical constraints. Inorder to obtain a real time feasible packing pattern, Genetic Algorithm is developed to maximize the container volume utilization and inturn profit [9]. It significantly improves the search efficiency with less computational time and loads most of the heterogeneous boxes into the container by considering its optimal position and orientation. Tuning algorithm is used to decode the genetic output into user understandable sequential packing pattern and to fill the left-out empty space inside the container. In general, GA in conjunction with the tuning algorithm is substantially better than those obtained by applying heuristics to the bin packing directly.
Optimization of the Vertex Angle of Metal Saw Tooth Based on Static Analysis
Authors: Liu Jing , Liu Xue Jiang , Zhang Shi Qiang
Published: February 2012

Aimming at the main failure modes such as the metal saw blade wearing and tearing too fast and short working life, this paper researched the influence of the vertex angle to the stress and it’s distribution using ANSYS. On the basis of static analysis, taking smaller stress and reasonable distribution as destination, the optimal vertex angle is obtained.
Conceptual Design for the Structure of Electric Car Body
Authors: Yue Hui Jun , Xu Xiang Yang , Li Li Jun
Published: February 2012

In this paper, ANSYS software is applied to determine the material distribution, load transfer path and equivalent sectional dimensions of the conceptual car body model based on the original body shape of engine cars. In terms of the finite element model of the body, the topology optimization is carried out according to the maximum bending and torsion stiffness, respectively. Through comparing the material distribution under different volume fractions and considering at the same time the manufacture feasibility, the initial style of body frame is achieved. Then, as the sectional dimensions of beams is optimized in both size and dimension, parameter matching scheme of the body frame in minimized weight is brought forward under constraints of the strength and stiffness at maximum frontal impact loads that improves the utilization rate of the material. The results suggest that both the design efficiency and quality can be improved greatly by combining topology and size optimization technology at the concept design phase of car body structure.
Parameter Optimization of Cyclone Separating Cleaning System Used on Combine Harvester of Wheat
Authors: Geng Ling Xin , Zhang Li Juan , Liu Shi Duo , Shi Qing Xiang
Published: February 2012

Four primary parameters including top cone angle, separating barrel’s height, catching impurity fan’s rotate speed, winnower’s rotate speed were selected in this paper with self-fabricating test-bed. The optimal result of all factors was educed through orthogonal experiment, quadratic universal rotary assembly experiment and optimum design, and provide gist for separating cleaning system’s design of micro- combine harvester of wheat.
Optimization of Stamping Parameters Using Stochastic Focusing Search Algorithm
Authors: Long Ling , Song Chao , Yin Guo Fu
Published: February 2012

A new kind of swarm intelligence algorithm called stochastic focusing search(SFS) is proposed and applied to optimize sheet metal forming process in this paper. The steps of the optimization procedure include combining numerical simulation technology with orthogonal experiments to provide training samples for BP net, and producing the fitted function as optimization function for SFS algorithm. The validation of the final optimization results by a rectangular box part stamping case shows that this kind of optimization methodology is correct and reliable for the design of deep drawing process. Advantages of the SFS algorithm are demonstrated that SFS has good global searching ability and fast convergence speed in finding optimal solutions, which means the optimization method using SFS algorithm can provide a competitive way of solving the optimization design problems in sheet metal forming.
Fatigue Testing of Resonating One-way Double-stiffened Plate
Authors: Liu Wen Guang , He Hong Lin
Published: February 2012

Problems of vibration fatigue exist in the field of aeronautics and astronautics widespread, which endangered the safety and reliability for structures of aircraft. Vibration-exciter-based fatigue testing system was designed and a method for fatigue testing of the resonating structure was proposed. In test, natural frequency of the test pieces was tracked by the exciting frequency. Experiments are carried out for the typical components with different working condition. One is with given strain, and another is with given force. Results indicate that impacts of the strain amplitude, the damping, the natural frequency and the boundary conditions on vibration fatigue life are obviously.
Research on UG Overturning Characteristic of 75t Iron Ladle
Authors: Li Shan , Gao Bo , Wang Yu Qi , Wang Lei
Published: February 2012

The iron ladle is a kind of large metallurgy equipments and used for collecting and carrying iron water. According to the factual demand of produce, some corporation wanted to enlarge the capacity of the idle from 65t to 75t only by increasing the height of ladle. This paper is aimed at the changing idle which the capacity is 75t and built up its 3D numerical model. According to the constant of the iron water capacity, it used the method of modeling to find the angle of the ladle taphole and made sure the ladle couldn't overturn automatically by studying the process of overturning. Then this paper worked out the overturning moment so that it could provide mechanics data for the analysis of the finite element and the reformation of the corporation.
Finite-Element Analysis of 950 Mill Housing Based on ANSYS
Authors: Guo Xi Ping , Feng Yan Fei
Published: February 2012

Stress and deformation analysis of 950 mill housing was done by means of ANSYS to calculate the maximum stress and deformation. Strength and stiffness of the mill roll were checked to meet requirements. The weakness was revealed of the structure for the mill housing, and it is significant for similar mill housing designs.
The Reliability Analysis of Cylindrical Helical Compression Spring of Various Design Parameters
Authors: Shi Jun , Huang Ya Yu , Hu Bin Xing , Hu Xiang Ping
Published: February 2012

When designing the cylindrical helical compression spring, many designers use high- strength materials or various strengthening technology approaches in order to improve the reliability of spring. These approaches increase the costs and reduce economy. With the help of MATLAB software, this paper analyzes how the chosen design parameters of the cylindrical helical compression spring influence its reliability based on stress-strength interference model with the way of controlling variables method when the fatigue life of spring is longer than one million cycles. It is shown that changing the spring design parameters, instead of using valuable or rare materials, can achieve high reliable level especially when the reliability of spring can't reach the requirement and hence can get a better economic benefit.
Study on Analysis Method of Transmission Gear Impact Property
Authors: Wang Zhan Li , Pang Zai Xiang , Zhang Bang Cheng , Liu Tie Jun
Published: February 2012

For all kinds of vehicles their transmission gears are the most vulnerable to shock damage one of the parts, mainly for failure forms of repeated impact load bending fatigue damage. Second speed gear is commonly used to start and drive, using dynamics software ADAMS and finite element software ANSYS to study its working conditions, to simulate sudden operation condition of the clutch. Through this method we can get a good result. In order to prove the accuracy of analysis method, comparing the simulation results and the classic design formula. The system can be obtained rapidly of the test results for the development of advanced auto transmission system provides reliable test data, to find and solve the weak link of design immediately.
Aided Navigation System Research Based on Multi-Information Fusion
Authors: Zhang Xiao Hui , Qing Liu , Li Mu
Published: February 2012

This paper designed a multi-information fusion algorithm after analysis information from vision sensors and radar sensors. This algorithm used D-S evidence theory to fuse the information of vision sensors and radar sensors to judge the front obstacles, and a final decision is made by the distance information provided by radar to decide whether give the driver corresponding warning. It also designed a critical vehicle distance, which can change according to relative distance and relative velocity. The test results show that this algorithm can give warning information correctly and greatly decrease the uncertainty, thus satisfying the requirement of car aided navigation system. At a resolution of 320×480, the identifying speed of this algorithm can reach 62.5ms/F which satisfied the requirement of real-time of car navigation.
Robust Tracking Control for a Class of Nonlinear Systems
Authors: Yu Yang , Wang Wei
Published: February 2012

This paper deals with the problem of fizzy robust tracking control for a class of nonlinear systems. The nonlinear system is approximated by T-S model, considering the modeling error. The tracking error of the controlled system following the reference signal is studied, and the tracking error’s exponential stability. The coherence of tracking control and stabilization control of the fuzzy systems is proved by using Lyapunov function theory combining with linear matrix inequalities (LMIs).Simulation results demonstrate the effectiveness of the proposed approach and conditions.
Research on the Multi-Index Comprehensive Evaluation Method of Electromechanical Products’ Disassembly
Authors: Jiang Ji Bin , Zeng Shou Jin , Xu Ming San
Published: February 2012

Considering that the disassembly performance of electromechanical products is determined by multi factors, the multi-index comprehensive evaluation method research is carried out to solve the complex problem of disassembly analysis. The theoretical minimum parts number discrimination model, the disassembly time classification model and the disassembly cost calculation model are proposed in this paper. A comprehensive evaluation system for disassembly is constructed and the evaluation process is established at the angle of evaluation tools developing. Finally, a flywheel institution is evaluated by using the proposed method and the feasibility and practicality of this method is verified.
Hierarchical Correspondence of 3D Faces Based on Thin Plate Spline Deformation (HCTD)
Authors: He Yi Yue , Geng Guo Hua , Zhou Ming Quan , He Jie Qiong , Jia Jia , Li Kang , Du Hong Qiang , He Xiao Wei
Published: February 2012

Aiming at establishing physiological consistent point correspondence between 3D faces, this paper proposes a new hierarchical correspondence method based on thin plate spline deformation called HCTD by introducing local geometric constraints. Firstly, mark feature points in unified Frankfurt Coordinate and the sample face deform based on thin plate spline function according to strict correspondences of feature points, so the sample face approximately coincide with the template; Secondly, build voxel models respectively and select vertexes with salient feature from the template as the current under-corresponding vertex, and the candidate set of the corresponding vertex on sample face is determined by local relative position geometric constraint and Euclidean Distance constraint. Finally, the optimal corresponding vertex is selected according to the weighted distance of local geometric features. Experimental results prove that HCTD can establish point correspondence of faces with higher precision than existing methods.
Comparative Experimental Research on Cryogenic Gear Hobbing with MQL
Authors: Zhang Xiao Hong , Xia Chong , Chen Peng , Yin Guo Fu
Published: February 2012

Gear hobbing in cryogenic air with minimal quantity lubricant (MQL) is a better choice to take place of traditional gear hobbing in oily cutting fluid, in which cryogenic air with pulverized vegetable oil place the great amount of mineral cooling oil, to play the role of lubrication, cooling, chip clearance, and rust prevention. By the comparative experiments, differences on cutter wear are explored, among cryogenic gear hobbing with MQL, gear hobbing in oily cutting fluid, and dry gear hobbing. It indicates that the gear hobbing in cryogenic air with minimal quantity lubricant is practical, and not only a great amount of cooling oil is saved to lower cost and environment pollution, but also life-saving of hobbing cutter reduces production cost.
Experimental Study on Hygroscopicity of Rapeseed (Brassica Napus)
Authors: Yang Ming Jin , Xu Wu Ming , Tang Tian , Yang Ling , Liu Feng
Published: February 2012

The hygroscopicity property of the rapeseed at different temperature and humidity was experimental studied in this paper. Tested results show that: the moisture absorption rates increase with the increase of relative humidity at the early period of absorption, and higher temperature leads to earlier reach of moisture equilibrium; the critical relative humidity(CRH) increases with the increase of temperature; the optional relative humidity for safety storage of rapeseed should be controlled less than 60%.
Novel Design of Biped Robot Using Cable Differential Joint
Authors: Wei Hui , Shuai Mei , Wang Zhong Yu
Published: February 2012

In this paper, a novel design of cable differential joint for biped robot is proposed. The transmission of joint is cable and operates in differential mode. Then, cable differential joints are employed to the humanoid robot BHLEG for its torque redistribution, 3-Degree of Freedom (DOF) cable differential joint for hip, one DOF joint for knee, and 2-DOF cable differential joint for ankle. According to the distribution of human energy, torque redistribution of cable differential joint can reduce the power consumption of actuator. Simultaneously, the peak torque and size of actuator is reduced. The aim of this paper is to verify a simplest mechanism for biped walking with lower energy consumption.
Optimization of Electric Turn-Over Bed Based on Mechanism Linkage
Authors: Xin Shao Jie , Zhang Huan Huan
Published: February 2012

Electric turn-over bed is designed for those who have the needs of turning their bodies over in bed. The design is based on mechanism linkage and it comply with human body engineering principles. Virtual sample machine is established in ADAMS software, and we focus on making the minimum of the lifting-tilting angular acceleration of bed board during the turn-over. Based on the results of the experiments, optimizing design of turn-over mechanism is provided, and this design guarantees the best structure and size while the constraints are satisfied.
Dynamical Behaviors of Nonlinear Viscoelastic Piles with Damage
Authors: Sheng Dong Fa
Published: February 2012

Base on the constitutive model expressed by convolution method for viscoelastic materials with damage, the initial-boundary-value problem analyzing static-dynamic behaviors of homogeneous, isotropic viscoelastic. Tiimoshenko beams with damage, placed on a viscoelastic foundation, is formulated under the case of finite deflections. And we adopt the model to simulate the dynamical behaviors of viscoelastic piles with damage placed on a viscoelastic foundation. The numerical methods in nonlinear dynamics are used to solve the simplified systems. The phase-trajectory diagrams, Poincare sections and bifurcation diagrams are all obtained. The influences of the material parameters of pile and foundation and load parameter on the dynamic behavior of the nonlinear system are investigated in detail.
Twin-Tracked Robot Obstacle Three-Dimensional Modeling and Simulation
Authors: Wu Bing , Wei Zen Ju
Published: February 2012

Obstacle robot crawler is a very complex mechanical products. Crawler robot obstacle for traditional development pattern of the development cycle there is a long, complicated process, development costs are too high, difficult issues such as performance testing, this twin-tracked to the more impaired actual robot context of the study, the application of simulation technology robot design and development research. Use of 3D modeling software Pro / E and two-body dynamics simulation software to create more obstacles the robot tracked the virtual prototype model, the virtual prototype model based on a variety of simulation experiments, and the test results analysis.
Analysis on Influence Coefficient of Workspace of a Configuration Palletizing Robot
Authors: Li Jin Quan , Zhu Su Xia , Lei Quan Sheng
Published: February 2012

Based on a configuration palletizing robot, its kinematic models were built by using D-H method. Solver program and interface are developed by using Matlab software and numerical method. Then, its three-dimensional workspace drawing and sectional drawing are derived in the context of any number value of key parameter. Based on that, in order to analyze the influence of workspace caused by the change of robot structure parameters quantificational, the concept of workspace influence coefficient is introduced. The influence coefficient curves of the length and rotation angle of connecting rods on workspace are calculated. Those reveal the influence extent and influence trend caused by the change of unit length of the robot structure parameters and provide a basis for robot’s structural optimization from kinematic view.
Design of 8-DOF Humanoid Robot Foot
Authors: Wei Hui , Shuai Mei , Wang Zhong Yu
Published: February 2012

In this paper, a novel design of humanoid robot foot is proposed for uneven terrain walking. The proposed foot occupies 8-DOF, 4-DOF for pitch motions and 4-DOF for roll motions. To adapt to complex terrain with high energy efficiency, passive springs are placed at passive joints. The designed 8-DOF robot foot can absorb the influence of irregularities on the ground and unexpected disturbances. Through walking experiments, we confirmed the effectiveness of the proposed foot that maintained locomotion on uneven terrain with bump.
Three-Dimensional Numerical Analysis of Tunnel Seepage Based on the Iteration Method
Authors: Liu Fu Sheng , Xu Guo Yuan , Hu Sheng Bin , Huang Wen Tong , Hu Min
Published: February 2012

The groundwater can cause a significant threat to the safety of the tunnels excavated in water-rich areas. To investigate the impact of seepage to tunnels, the most important issues are calculations of the saturated surface and seepage flow. According to the great similarity between temperature field and seepage field in the theoretical foundation, differential equations and boundary conditions, the thermal analysis function of ANSYS could be used to calculate the non-pressure stable seepage based on the iteration method. The saturated surface and seepage flow through the lining are obtained by take a tunnel as an example, under using iteration method programming in ANSYS software. Additionally, on the basis of the correlation analysis, with the reduction of ground water level, the seepage discharge through the lining decreased sharply at the beginning, and then, the reduction trend gets inconspicuous. It has no obvious effect to decrease the water discharge by reducing the ground water level under this condition. Therefore, taking economic benefits into account, it is unadvisable to lower water level blindly. The optimal analysis of the actual conditions should be carried out in engineering practice. It has a certain reference value to the design and construction of tunnels in water-rich areas.
Blind Watermarking for CAD Models Based on Identification
Authors: Liu Xun , Zhang Yin , Liu Nan , Chen Zhi Yang
Published: February 2012

Currently there has been much interested in developing the watermarking for 3D graphic data of NURBS or mesh model, for its function of copyright protecting, private detection under the network environment. Since the majority of computer aided design (CAD) applications employ parametric curves and surfaces, this paper proposes a watermarking mechanism for CAD models, those employ non-uniform rational B-spine (NURBS) curves and surfaces as their main shape-defining primitives. This algorithm using relative knot insertion method embeds the watermarks generated by features sequence identification into the NURBS primitives. The shapes are exactly preserved. We don’t need ether original model or original message to extract the watermarks from the watermarked models, since it is blind. By experimental result, we confirmed the watermarking mechanism is robust against most common attacks.
LPDC Process Optimization of Copper-Alloy Taps Based on CAE Technique
Authors: Tian Lei , Wang Qing Feng , Duan Hui Zhen , Shen Jiang Nan , Li Yan Ping
Published: February 2012

Low pressure die casting (LPDC) process of a copper-alloy tap was simulated by the finite element software ProCAST. The casting defect and its reason were analyzed. The optimized design was discussed and the simulation was validated against the low pressure die casting experiment. Results showed that the main defect is misrun and its reason is that the melt solidifies too fast. It’s well solved by increasing the wall thickness of the relational pipe properly. The result agrees with the experiment.
Optimal Design Method of Automotive Charged Air Cooler Based on the Matching of Hot-Side and Cold-Side Flow Channels
Authors: Xiao Bao Lan , Wu Wei Ming , Yu Xiao Li , Lu Guo Dong
Published: February 2012

Charged air coolers (CAC) are the major components in automotive turbo-charging system. Fin parameters play an important role which affect thermal-hydraulic performances significantly. According to typical fin structures, this paper carried out the matching design of hotside and coldside flow channels in CACs. Based on numerical simulation results, the fluid flow and heat transfer performances of 9 matched CACS were comprehensively evaluated and thus the optimal structure was determined. The results are consistent with engineering practices. This design method can reduce CAC research costs and shorten development period and offer guidance for the designing and manufacturing of CACs.
FEM Analysis on Slope Step Reinforcement Micro-Pile
Authors: Huang Hao , Yao Shun Zhong , Zhang Wen Sheng , Li Xiang , Huang Gang
Published: February 2012

Micro-pile of slope reinforcement type is more and more used in slope engineering, at the present stage most of the projects are designed by engineer experiences, theory researches are hysteretic, load transfer and mechanics characters are not clear. Combining with Heshun highway Slope treatment project, this micro-pile structure are analyzed with finite element method (FEM) under different conditions like different anchorage depths, pile diameters and displacements on the pile roof. Under these conditions the strain and stress are calculated, the results shows that: there is an optimal anchorage depth, under this depth the concrete can produce the best properties and save funds; increase the diameter will improve bearing capacity observably; the displacement of pile roof can also can be decreased if increase the modulus of elasticity.
Effect of Assembly Error on the Meshing Characteristic of Spacial Beveloid Gears
Authors: Wang Hai Xia , Chang Jia Dong , Zhang Lei
Published: February 2012

For the beveloid gears with intersecting axis and crossed axis coexisted in the marine gearbox with small down angle, contact analysis of the meshing gear pair taken the assembly error into consideration is proposed based on the nonlinear finite element analysis software Abaqus. Considering the central distance error, axial position error and the angle error, the FE model of beveloid gear pair with intersecting axis and crossed axis were established, respectively, and the tooth contact stress, the maximum influence factor and transmission error were calculated. The effects of these errors, the central distance error, axial position error and the angle error on the contact characteristic were discussed.
A Numerical Study of the Effect of Bubble Layer on Propulsion Performance of Deep-Vee Hull Form Ship
Authors: Li Qi Yao , Yongpeng Ou
Published: February 2012

A numerical study of the effect of Bubble Layer on Propulsion performance is carried out by using the Air-Liquid Mixture Model. The effect of factors, such as air flow rate, air injected positions on propulsion performance are investigated. The following findings are obtained: (1) In the open water conditions, the air injected inlet is farther away from the propeller center, the little more effect on the propulsion performance; Along with the increase of air flow, the effect of bubbly layer on the propulsion performance increases slightly. (2)Because of the hull form and the clearance between the bottom and the blades tip, bubble layer has small effect on propulsion performance of deep-vee hull form ship propelled by propeller.
The Implement of Optimization Design of a Car Body Based on VCD-ICAE System
Authors: Hou Wen Bin , Bi Zhen Jun , Zhang Hong Zhe , Hu Ping
Published: February 2012

In order to get the optimistic structure property and design parameters of a car body, the system of vehicle body concept design (VCD-ICAE) was developed by us to make the body design in the conceptual phase in the paper. It can build parametric geometry modeling and FEM model of body-in-white (BIW) automatically, and the structural stiffness was calculated. Based on the former model, a multi-objective optimization of the total body was designed to afford the reasonable parameters for detailed model of BIW, which realized lightweight of the whole body and high stiffness. In the paper, the total theory and flowchart of vehicle body concept design were afforded. An example with real body’s data was shown to prove the validity of the multi-objective optimization module in VCD-ICAE system. Finally, the optimal design scheme of the body was provided.
Vacuum Exhaust Processes in Vacuum Pressure-Swing Adsorption for Upgrading Methane in Ventilation Air Methane
Authors: Li Yong Ling , Zhang Chuan Zhao , Liu Ying Shu , Yang Xiong , Meng Yu
Published: February 2012

Vacuum pressure swing adsorption (VPSA) process with vacuum exhaust step for concentrating ventilation air methane (VAM) was studied experimentally. The effect of vacuum exhaust ratio on methane concentration and recovery are investigated. The results shows that vacuum exhaust step can increase the methane concentration of product gas without increasing pressure. As the ratio increases, the concentrations of methane in both product and effluent firstly increase, and then reach steady state after a certain vacuum exhaust ratio. The process of vacuum exhaust gas recovered can increase methane recovery and concentration, but it will decrease the methane concentration of product when the vacuum exhaust ratio is lower than 1.0. The results could provide reference for the industrial application in VAM enrichment.
Study on the Distribution and Coordination Mechanism of Benefit for Parts Involved under the Agro-Product Supply-Chain Environment
Authors: He Zhong Wei , Lei Sheng Fang , Liu Fang , Gui Lin
Published: February 2012

This paper briefly summarizes the practical experience of distribution and coordination mechanism of agro-supply chain in western developed countries, especially in USA, and systematically analysis the main obstacles for the distribution and coordination mechanism of benefit at present in china. Besides, based on the integrated use of system dynamics and related theories, it eventually builds a systematical framework for the distribution and coordination mechanism of benefit for the main parts involved under the agro-product supply-chain environment.
Corrosion Behavior of New Weathering Steel in the Environment Simulating Coastal Industrial Atmosphere
Authors: Cui Wen Fang , Shao Chang Jing , Liu Chun Ming
Published: February 2012

The corrosion behavior of low carbon bainitic steel with Cu-P alloying in the environment simulating coastal industrial atmosphere was investigated by using dry-wet cycling corrosion test. 09CuPCrNi steel and low carbon bainitic steel without Cu-P alloying were used as comparative steels. The corrosion kinetics and electrochemical impedance spectra of the steels were measured, respectively. The morphologies of rust layers were observed by SEM and the phase constitutes of the rust layers were analyzed by XRD. Low carbon bainitic steel with Cu-P alloying behaves the lowest corrosion rate and the highest resistance of rust layer. Bainite microstructure is responsible for the uniform corrosion and the formation of dense rust layer. Cu-P alloying accelerates the transformation of gamma-FeOOH and Fe3O4 to thermodynamic stable phase alpha-FeOOH, which improves the protective effect of the rust layer.
Power Generation from Randomly Oriented Electrospun Nanofiber Membranes
Authors: Fang Jian , Wang Xun Gai , Lin Tong
Published: February 2012

Randomly orientated electrospun poly(vinylidene fluoride) nanofiber membranes were directly used as active layers to make mechanical-to-electrical energy conversion devices. Without any extra poling treatment, the device can generate high electrical outputs upon receiving a mechanical impact. The device also showed long-term working stability and ability to drive electronic devices. Such a nanofiber membrane device may serve as a simple but efficient energy source for self-powered electronics.
Preparation of a New Flame Retardant Based on Phosphorus–Nitrogen (P–N) Synergism and its Application on Cotton Fabrics
Authors: Dong Zhen Quan , Yu Dan , Wang Wei
Published: February 2012

Abstract: A novel oligomeric P–N synergistic flame retardant (FR) poly(phenyl O–(2–aminoethyl) phosphonamidoate) (PPAP) was synthesized and characterized by fourier transform infrared spectrometry (FT–IR) and 1H nuclear magnetic resonances (1H NMR). Application of PPAP on cotton fabric was studied, and the results showed that the best dosage of PPAP and coupling agent tetraethyl orthosilicate (TEOS) were 350 g/L and100 g/L respectively. Under these conditions, the treated cotton fabric was tested with 10.6 cm of char length. The results of thermogravimetric analyser (TGA) indicated that the fabrics treated with PPAP were more stable in high temperature compared with original fabrics. All the results implied PPAP can be used as a promising FR.
Investigation on the Influence of Machining Fluid on Processing Characteristics in Micro-EDM
Authors: Li Sha , Natsu Wataru , Masaki Takeshi , Yu Zu Yuan
Published: February 2012

In this paper the influence of machining liquid on the processing characteristics, such as the tool electrode wear and the tool actual feed were discussed. Micro EDM drilling was carried out using deionized water and oil dielectric as the machining liquid. It was found that using deionized water reduced the tool electrode wear. Also, occurrence of short-circuits during the processing is one of the reasons for causing large electrode wear. In the case of using oil dielectric, processed depth influences the tool electrode wear greatly and causes the change in the actual feed rate. While using deionized water, processed depth also causes the change in the actual feed rate, but nearly had no influence on the tool electrode wear. Meanwhile, when using deionized water, although the small electrode wear and high machining speed can be obtained, electrolytic dissolution may occur. Therefore, the effective method of decreasing the open voltage and increasing the feed rate to prevent the electrolytic dissolution was mentioned and experimentally verified.
Non-Precious Metal Catalytic Materials for Auto-Thermal Reforming
Authors: Hsu Andrew , He Hui , Huang Li Hong
Published: February 2012

Auto-thermal reforming (ATR) of bio-ethanol is a promising process for hydrogen production, which can lead to the possibility of directly using low concentration ethanol from fermentation plants without going through the energy-consuming distillation and dehydration processes, saving both energy and cost. Ni-based and Co-based catalysts are active for hydrogen production in ATR, where the hydrogen yield and stability are important factors to be considered. To address the concerns of selectivity and deactivation, iron was introduced into Ni-based and Co-based catalysts via wet-impregnation. The catalysts were characterized with TPR, XRD and XPS, and tested in ATR of ethanol. All the results show that iron can play an important positive role in both nickel-based and Co-based catalysts for auto-thermal reforming because of its enhancement of catalytic activity, hydrogen selectivity, as well as durability.
The Machining Process and Stress-Strain Analysis of the Imprinter Bottom Roller Based on FEM
Authors: Liu Han Wu , Huang Lei , Zhao Wang Chu , Chen Liu Po , Liu Na
Published: February 2012

The imprinter bottom roller is under very high linear pressure during the work, which often causes wear and damage between bottom roller and anvil roller. Traditionally, the extra strength design method is frequently used in the design of imprinter bottom roller, which leads to the waste of materials and increase of weights. So, reasonable processing craft and appropriate theoretical analysis method should be adopted to improve the manufacturing of bottom roller and make the material strength into full use, in the condition of meeting the structure safety standard. This paper gives a brief analysis of the process craft of bottom roller and uses finite element technique to give the bottom roller numerical simulation and FEA of its deflection and strength. The results show that: in the process of work, the distribution of stress changes largely and unevenly. The stress and deformation in middle part prove the largest with decreasing to both sides successively. The imprinter bottom roller produces a maximum displacement of 0.0516 mm, which meets the work requirements.
Numerical Simulation of a Coke Oven
Authors: Hao Dan Dan , Liu Wen Sheng , Dang Le Ping , Wei Hong Yuan
Published: February 2012

At present, the CFD numerical simulation, combined with an experiments involving heat transfer has become an important approach to studying coal carbonization. The aim of this paper is to illustrate how a standard CFD package may be modiﬁed so it can be used to simulate temperature distribution, coking time and carbonization processes that occur in coke oven charge. Content of volatile matters and moisture have important influence on heating rate during carbonization. Further, heating rate have effects on char structure an inner coking condition, as well as the carbonization time. In addition, furnace wall temperature have important effects on carbonization, because they can change the coking time. Our simulation results for the coke oven model are in agreement with experimental and virtual data.
The Simulated Analysis in the Computer on the Effect of Pile and Soil Working Together about the Push-Extend Multi-under-Reamed Pile
Authors: Qian Yong Mei , Ren Jia Jia , Yin Xin Sheng
Published: February 2012

In the paper, the limited unit method is applied in order to simulate analyzing the effect of pile and soil working together and the failure principle of soil around the pile. The distribute condition of the soil stress around the pile is defined, and it is put forward that the influence for bearing capacity developed by the Multi-under-reamed bearing loads.
Effect of Orientation Relationships on the Stiffness and the Strength of the Dual-Phase Metals: Molecular Dynamics Simulation
Authors: Zhang Yan , Zhao Yan , Zhang Fu Cheng
Published: February 2012

Phase boundary is an important kind of interfaces for the dual-phase metals. Orientation relationship (OR) is a crucial factor affecting the performance of the phase boundaries and the dual-phase metals. Molecular dynamics simulation is performed to examine the structures of the bcc/fcc iron phase boundaries in Nishiyama–Wassermann (N–W) and Kurdjumov–Sachs (K–S) orientation relationships, and the performances of the dual-phase model with these ORs. The structural relaxation shows that the phase boundary with N-W relation has the lower energy than that in K-S relation. Stress-strain curves show that dual-phase model in N-W relation has the higher stiffness and strength than that in K-S relation. Simulation results show that phase boundary in N-W relation has a more exellent performance, and is preferred to be processed in heat treatment.
The Research of Phase Method of Laser Ranging Measurement System
Authors: Huang Jing , Dong Bao Quan
Published: February 2012

The phase method of laser ranging modulates laser by using a continuous wave, calculating the time interval indirectly through the phase variation of the modulation wave when it propagates between the measured targets, and make out the measured distance. This paper uses the principle of phase method of laser ranging, proposes the overall design scheme of phase method of laser measurement system which achieves the distance measurement by using methods of the difference frequency measurement and digital phase discrimination as well as the microcontroller. It also analysis the system possible errors from many aspects, puts forward the appropriate measures to improve the accuracy of the measurement.
Vector Geographic Data Encapsulated Based on ArcSDE
Authors: Zhang Li Juan , Zhang Fu
Published: February 2012

Aiming at copyright of vector geographic data, this paper puts forward an idea using the monitoring services to protect copyright. To protect vector geographic data by using the monitoring services, this paper describes the process in detail, which vector geographic data is encapsulated to copyright data in advance, taking the ArcSDE as an example and basing on analyzing the storage structure of vector geographic data stored in database format. The results from the experiments show that the means ensures the integrated data do not affect the use of other data, but also the integrated data have better robustness.
The Finite Element Method of Dynamic Analysis on the Structure of Simultaneous Effect of Static Load and Sinusoidal Load
Authors: Zhang Bao Qin , Wu Hai Zhi
Published: February 2012

This paper points out the practical significance of the finite element analysis of kinetics on the structure of simultaneous effect of static load and sinusoidal load, and according to the theory of finite element method ,the principles and methods of solving problem were studied, and then in the general finite element software of ANSYS ,through a concrete example, the solving process of the problem was achieved. This method could be used to the dynamic analysis on the structures of simultaneous effect of many different frequency sinusoidal load. The applied scope of finite element method must be extended by using this method
Modeling and Kinematics Simulation of a Six-DOF Segment Erector for Tunnel Boring Machine Based on Virtual Prototype
Authors: Li Gang , Zhu Li Da , Yang Jian Yu , Wang Wan Shan
Published: February 2012

In this paper, we present the modeling and kinematics simulation of a six-DOF segment erector for tunnel boring machine (TBM), which is performed in the virtual prototype platform. The 3D virtual assembling model of a tunnel segment erector is built based on Pro/E software according to its design parameters such as structure and size. After the interference inspection, the model is imported into ADAMS through the interface module of Mech/Pro. The model is simplified and optimized reasonably and various constraints are applied under variety working conditions. The results of simulation show that the design has six degrees of freedom movement capacity which meets the design requirements. At the same time the kinematics characteristics of each part along three different directions are obtained and they will provide some references for the further optimal design.
A Disturbance Rejection Strategy for Asynchronous Motor of the Electric Vehicle in Speed-Open-Loop Operating Mode
Authors: Zheng Gang , Wu Jian Dong , Kuang Ming Wei , Zhang Deng , Yang Yang
Published: February 2012

For any electric vehicle on the road, it is inevitable to be influenced by parameter uncertainties and some kinds of disturbance torques, which present challenge for the controller design in the electric vehicle. Therefore, control of the electric vehicle to achieve the safety running requirement becomes important. In this paper, we investigate the control method for electric drive system of the electric vehicle from both theoretical and applied perspectives, then, speed loop inverse based disturbance rejection control strategy is proposed. The proposed approach is illustrated by implementing it into an experimental platform. The experimental results demonstrated that the proposed control method can achieve rapid response to current variation at operating frequency of electric vehicle, and substantially suppress the adverse effect of current variation at high frequency.
Research on Hydrodynamic Characteristics of Underwater Gliding UUV Based on the CFD Technique
Authors: Guang Pan , Hu Bin , Du Xiao Xu , Wang Yi Yun
Published: February 2012

Computational fluid dynamics (CFD) technique is used to calculate and analyze the hydrodynamic characteristics of underwater gliding UUV. Governing equations and turbulence model applied to the hydrodynamic calculation are proposed. Calculation results show that the underwater gliding UUV has a good hydrodynamic characteristics which are relatively close to engineering estimation results. Research in this paper lays the foundation for further in-depth study.
An Analytical Method for Vibration Fatigue of Cracked Beams
Authors: Liu Wen Guang , He Hong Lin
Published: February 2012

A new analytical method for vibration fatigue life of cracked beams was proposed with the structural response changes as crack growth. In analysis, the damping loss factor was introduced by the complex elastic modulus, and the crack growth was simulated by employing a Paris equation, and the coupling effect of vibration and crack growth was considered through vibration analysis and estimation of fatigue crack propagation cycles by cycles. Results indicate that impacts of exciting frequency and damping on the crack growth are obvious. The resonance fatigue crack growth rate decreases rapidly when big damping is involved, and the first mode is more important to the crack growth than that of other mode.
Slider-Crank Type Cluster Wells Pumping Motion and Dynamics Analysis
Authors: Ren Tao , Liao Dong Sheng , Qu Wen Tao , Sun Wen
Published: February 2012

At present, one pumping corresponding one oil well exploitation pattern has been unable to meet the cluster well oil recovery characteristics of muti-well platform. Single-well pumping unit’s torque factor is too large, resulting in the peak of the net torque of the crank shaft is too large and the fluctuation is too large, which lead to the increasing of the pumping consumption. Slider-crank type cluster well pumping unit can realize a pumping unit driving several wells pumping and make use of the principle of rod load balancing each other, no need of special balance block, having good balance effect, the crankshaft net torque having smaller peak and energy saving effect is obvious .Proposing the cluster well pumping unit design program based on slider- crank type mechanism, establishing the corresponding motion and dynamic analysis equation and analyzing the performance of slider- crank type cluster well pumping unit based on the actual load conditions.