bluuebunny/crossref_metadata_2025 huggingface dataset:
Investigation on Convective Heat Transfer over a Rotating Disk with Bottom Wall Subjected to Uniform Heat Flux
Authors: Zhang Jing Zhou , Tan Xiao Ming , Zhu Xing Dan
Published: December 2012

A three-dimensional numerical study on the flow and heat transfer characteristics over a rotating disk with bottom wall subjected to uniform heat flux was conducted with the use of RNG k- turbulent model. And some experiments were also made for validation. The effects of rotating angular speed and pin configuration on the temperature maps and convective heat transfer characte-ristics on rotating surface are analyzed. As the increase of rotating velocity, the impingement of pumping jet on the centre of rotating disk became stronger and the transition from laminar to turbu-lent occurred at the outer radius of rotating disk, which resulted in heat transfer enhancement. The pins on the disk made the pumping action of a rotating disk weaker. Simultaneously, they also acted as disturbing elements to the cyclone flow near the rotating disk surface, which made the overall heat transfer to be enhanced. Under the same extend areas of different pins, needle pin has higher convective heat transfer capacity than the discrete ring pin.
Numerical Simulation of Impinging Jet with Mist Injection
Authors: Tan Xiao Ming , Li Ye Fang , Zhang Jing Zhou
Published: December 2012

Two-phase CFD calculations using commercial code Fluent were employed to calculate the air and droplet flows with and without mist in an impinging jet. The effects of phase changing of the water droplets, the mist injection rate, the heat flux of target and the geometrical parameters of the slot were studied to reveal the cooling effectiveness. The results show that the key enhancement mechanism of mist/air impinging jet is the effect of evaporation of the droplets. The wall temperature significantly decreased because of mist injection and the injection of 5% mist has a strengthen of cooling effectiveness with 89% enhancement. This enhancement would be reduced by higher heat flux of target wall. Concentration plays a major role in the cooling performance. Increasing the mist ratio makes the cooling strengthen significantly. A mist of 5% can provide a cooling enhancement of 32% at stagnation than the mist of 1%. The effect of the mist ratio on cooling declines gradually from the impingement area to the downstream area. A fit width and height ratio had a major impact on the cooling performance of mist/air impinging jet. For constant mist/air mass flow and inlet width b, when H/b increases, the heat transfer coefficient increases first and then decreases; for constant mist/air mass flow and impinging distance H, the heat transfer coefficient increases as H/b increases.
Neural Network and D-S Evidence Theory Based Condition Monitoring and Fault Diagnosis of Drilling
Authors: Wang Jiang Ping , Lin Shun De , Bao Ze Fu
Published: December 2012

This paper focuses on drilling fault diagnosis with the technology of information fusion based on neural network and Dempster-Shafer evidence theory. Neural network is used to process the drilling engineering data monitored from drilling on-site. The primary diagnosis results of drilling faults can be obtained by comparing the outputs of the neural network. And also the outputs of neural network are utilized to construct a basic probability assignment function (mass function) to assign a value of mass function for each type of drilling faults. The final fault diagnosis results will be achieved by using Dempster-Shafer evidence theory on decision level through further reasoning primary diagnosis results of neural network. The proposed method can in time discover the engineering data whether abnormal so that can diagnose and classify them, and will improve the accuracy of the drilling fault diagnosis.
A Numerical Study on the Influence of Grooves on Heat Transfer Performance of Wet Clutch
Authors: Lei Yu Long , Wen Jie Tao , Li Xing Zhong , Yang Cheng
Published: December 2012

In order to evaluate the efficacy of grooves on cooling performance of wet clutch, a numerical analysis based on the computational fluid dynamics (CFD) code FLUENT is presented in this study. This analysis is based on the numerical solution of the three-dimensional Navier-Stokes equation, coupled with the energy equation in the flow and the heat conduction equations in the friction material and the core disk. The turbulence characteristics were predicted using RNGk-ε model. The flow field and temperature distributions in radial grooves are obtained. It is shown that radial grooves possess the highest heat exchange performance at the entrance and is not linear distribution in the radial direction and cooling oil flow has a little effect on the highest temperature of friction plate. With the developed analysis method, it is possible to easily and quickly investigate the heat transfer behaviour of wet cluth with groove patterns.
Development of Connecting Rod Three-Dimensional Parametric Design System
Authors: Guo Ke Xi , Tang Hao , Cao Qiong
Published: December 2012

Linkage of the three-dimensional parametric design system established through SolidWorks and the secondary development of the CAD with the needs of enterprise. In this system, users can carry out the parametric design modeling of the connecting rod, virtual assembly and generate engineering drawings, such as design work, and to carry out the simulation connecting rod and piston. The system helps users to achieve the optimization design of the connecting rod, thus saving the cost of product development. The system has marketing value because of the decreased of connecting rod design cycle.
Numerical Simulation of Non-Equal Diameter Cylinder
Authors: Yang Guang Jun , Sun Jing
Published: December 2012

Numerical simulation has been carried out on the wake flow structure of some simplified antenna model which is shaped as a non-equal diameter slender cylinder. The unsteady flow parameter-Strouhal number is confirmed to be a constant approximately in the subcritical state. The results show that at levels of different diameters, when the length-diameter ratio is large enough, each level can still maintain stable periodical vortex shedding phenomenon, the vortex shedding frequency of each level, the flow velocity and the equivalent diameter still meet the Strouhal relationship. The effect of connect transition area on vortex shedding stabilize region are close to the freestream velocity.
Three-Dimensional Structure Modeling in Tuo128 Block of Shengtuo Oilfield
Authors: Zhao Hong Bing , Li Xue , Wang Feng Hua , Cui Yong Bei
Published: December 2012

Three-dimensional geological modeling techniques, developed from 1980s, is a new geological technology used to make reservoir fine description and geological characterization with the combination of seismic, geological and reservoir exploration and development based on geostatistics. Three-dimensional geological modeling can achieve the quantitative characterization of the reservoir and heterogeneity of various scales. So far, it has been the most important content of reservoir description, what’s more, three-dimensional structure modeling can improve the accuracy and reliability of fine reservoir description through the establishment of three-dimensional reservoir model, the quantitative distribution of three-dimensional reservoir parameters and geometry.
A Kind of New Switching Power Supply with Multiple Isolated Outputs Used in High-Voltage Static Synchronous Compensator
Authors: Yan Bing Jun , Xu Ai Dong , Bai Zhan Yuan
Published: December 2012

The background of this paper is the power supply driven by High-voltage Static Synchronous Compensator series module, a kind of applicable to high voltage power module is proposed in this paper. Using High-voltage Static Synchronous Compensator, this device Switching Power Supply has the advantages of small in volume, light in weight, high efficiency and reliability. Compared with the high voltage of the insulation frequency transformer, this device overcoming many shortcomings, such as huge in volume and high price. This device is more suitable for distributed application, therefore it is very easy to realize multiple outputs of the power.
Comprehensive Evaluation for Safety Working Status of Hoisting Mechanism of Crawler Crane Based on 3-Scale AHP
Authors: Xu Ge Ning , Li Peng
Published: December 2012

To comprehensive evaluate the safety working status for hoisting mechanism of crawler crane based on fault analysis for hoisting mechanism of crawler crane, this paper builds a model of state comprehensive for hoisting mechanism of crawler crane and builds a fuzzy comprehensive set of safe working state for hoisting mechanism of crawler crane based on the 3-scale AHP(Analytic Hierarchy Process), then gets the weight of each index. With the help of the score of index graded by experts, safe working state comprehensive evaluation for hoisting mechanism can be gotten. The results of the engineering example shows that compared with 9-scale AHP, 3-scale AHP overcome the difference of subjective understanding, and save the inspection process of complex consistency, the method is concise and feasible, and the results reflect that it is same with the objective reality.
The Simulation and Sensitivity Analysis of S-Lay Installation in Deep Water
Authors: Sun Li Ping , Wang De Jun , Ai Shang Mao , Zheng Xiang
Published: December 2012

Pipelines being laying is subjected the high external water pressure, axial tension and bending moment, influencing the large deformation and the stability of pipelines. It is a key problem about the pipeline deformation and stress analysis under installation. The paper is focused on the analysis of the S-Lay method in deep water, modeling the deepwater S-lay installations considering interactions among the pipeline and stinger and the barge, which make the simulations more realistic. The large work of the paper issues the sensitivity analysis in the installation procedure, several examples are presented to calculate the pipeline configuration and mechanical analysis for different laying water depth, pipe diameter, thickness of wall and concrete weighted coating layer and stinger radius. Some results are presented as well.
Research on Integrated System Control Strategy of Regenerative Braking and Anti-Lock Braking System for Electric Vehicle
Authors: Wang Jun , Qiao Jun Kui , Qi Zhi Quan , Liu Bo Zhen
Published: December 2012

Based on ABS System,a regenerative and pneumatic baking system was proposed,which can adjust pneumatic braking force precisely through ABS valve in order to guarantee the distribution of braking force. A control strategy using logic threshold was made,considering ECE regulation,control logic of ABS system,braking torque of motor and charging-discharging characteristic of battery. A co-simulation model was built with the platform of Simulink-AMESim and the simulation was performed under different braking intensity and driving cycles. The results indicate that the vehicle can achieve good braking regeneration effect with ensuring braking stability .Ratio of energy recycling can achieve 16.26% in London bus driving cycles.
Design and Experiment on Paddy Hydraulic Drive Variable-Rate Fertilization Device
Authors: Chen Shu Fa , Zhao Zhen , Feng Cheng Long
Published: December 2012

In order to solve the problems of low-ground-clearance , backward manure regulation technology and low working efficiency presented in paddy fertilizing machine，a self-propelled spreader for rice variable-rate fertilization was designed, whole structure and working mechanism of the machine were introduced, hydraulic drive system of fertilizing device, fertilization disc and regulation device for fertilizing orifice were designed, key structures and parameters of the device were determined. Function relationship between orifice length and manure flow-rate was studied, linear equation was decided for variable-rate fertilization. Variable-rate fertilizing experiment shown that the velocity of fertilization disc changed about 0～900r/min continuously，the angle for pushing fertilizer board was at -20°～40°, the design for fertilization device can meet variable-rate fertilization requirements of widespread distribution and high efficiency in paddy fields.
Modeling and Analysis of Brake by Wire System in Electric Vehicle
Authors: Yu Lei Yan , Zhao Wan Zhong , Yi Jian Bo
Published: December 2012

In order to improve performances of a virtual prototype, modeling and analysis are necessary before a system is produced and put into use. Firstly, structure and control schematics of electric vehicle with the steer by wire system and brake by wire system integrated are analyzed. Then, dynamics models of brake by wire system including the motor, planetary gear reducer, ball screw, etc. are built using Matlab software. Finally, effects of brake by wire system parameters such as motor parameters on system performance such as time domain and frequency domain response characteristics are analyzed using modern control theory. The results show that the modeling and analysis helps to find the performance sensitive parameters ,which will be used for parameter optimization design of brake by wire system.
The Iterative Method for Reliability Estimation of Fatigue Life
Authors: Bai Xin Li , Xu Peng , Li Jiang Yan
Published: December 2012

The expression of reliability estimation method for fatigue life of machine parts was derived, and two kinds of stress cycles (reversed cycle and un-symmetric reversed cycle) were considered. An iteration method is presented and the corresponding computer program named STRENGTH-2 is developed for estimating reliable life of machine parts. The engineering application results show that the calculated results are close to experimental results. The proposed method can be convenient to carry out the fatigue reliability design for machine parts under the action of uni-axial and multi-axial loadings, and promote the popularization and application of existing anti-fatigue design method. It has the high value of engineering application.
Optimization of Two-Stage Closure Law of Turbine Wicket Gates and its Application
Authors: Chen Sheng , Zhang Jian , Yu Xiao Dong
Published: December 2012

Optimization of closure law is the priority selection in solving the guaranteed regulation calculation problems due to its simplicity and economy. This present study deals with the optimization of two-stage closure law of wicket gates, which has more advantages in control pressure and speed rise. The mathematical model of transient process is established by introducing the method of characteristic, whose correctness is validated by the field test. Then the model is applied to a specific hydropower station that only can employ closure law optimization to coordinate the contradiction between pressure and speed rise, for two-stage closure optimization. The achievements of the study can serve as a reference for similar projects.
Study on Fatigue Performance of Large Volume Seamless Steel Cylinder Served in CNG Hydraulic Daughter Station System
Authors: Dong Hong Lei , Duan Zhi Xiang , Li Bang Xian , Wang De Yin
Published: December 2012

The working condition of cylinder is different from the design which needs high frequency of 20~ 22MPa in hydraulic daughter station system. In order to evaluate the safety of cylinder, the fatigue performance of jumbo cylinder was studied by way of FEA. The results show that cylinder fatigue cycle life is less than 15000 under the pressure range 2~ 36.7MPa and it cannot be used as design working pressure 22MPa. But it can serve in 20~22MPa for infinite loop to meets the requirement of hydraulic daughter station.
Finite Element Analysis of Elevator Link Stress Based on Pro/E and ANSYS
Authors: Wang Jiang Ping , Wang Hong Tao , Bao Ze Fu
Published: December 2012

Combining the advantage of 3D design software Pro/E in modelling with the ability of finite element analysis (FEA) software ANSYS in analysis and calculation, this article builds 3D solid model with Pro/E, then imports the model into ANSYS through interface technology, finally establishes the FEA mechanical model of the elevator link. The stress distribution of elevator link under rated load is achieved by using ANSYS to analyze and calculate. The calculated results can be used to revise the design, improve the specific structural parameters, check and analyze the improved elevator link, thus improve the tensile and bending property of elevator link, provide reliable basis for reasonably designing and retrofitting the ring structure.
Discussion on Solving Systematic Matrix for Linear System of Invariant Time
Authors: He Cheng Hao , Yin Zhi Hong
Published: December 2012

For a given matrix function, determining whether it meets the conditions of the state transition matrix by utilizing the criteria of the state transition matrix. If satisfied, three computing methods of systematic matrix is deduced through both qualities and relationship with the systematic matrix of the state transition matrix, comparing the characteristics of every method and inspecting availability of each solving method. Finally, the simple way for solving systematic matrix is obtained, which provides reference for solving systematic matrix in practice.
Research on Stochastic Stability of Wheelsets with Primary Suspension
Authors: Liu Wei Wei , Dai Huan Yun
Published: December 2012

A new model for elastic constraint wheelset system of rail vehicle is proposed. Assuming the stochastic excitation as Gauss white noise, a stochastic model is built for elastic constraint wheelset system. Here two kinds of stochastic excitations are considered: one is the internal multiplicative excitation inherited in the internal system such as the spring and wheelset/rail contact geometric relationship, the other is the external excitation induced by track random irregularities. The model defined here is considered as a weak damping, weak excitation quasi non-integrable Hamiltonian system. The maximal Lyapunov exponent is calculated by quasi non-integrable Hamiltonian theory and oseledec multiplicative ergodic theory, and the stochastic local stability conditions are obtained. Meanwhile, the stochastic global stability conditions are derived by considering the modality of the singular boundary condition.
The Union Algorithm of Rolling Stocks’ Kinematic Envelope
Authors: Dong Hao , Luo Ren
Published: December 2012

Based on many computing method of kinematic envelope, a new algorithm is established. According to the result of locomotive time domain responses of dynamic simulation and kinematic principle, various Active contours of locomotive are solved. Using the obtained active contour and the concept of union algorithm of polygon in computer graphics, the union algorithm of kinematic envelope is designed. This algorithm is to solve the minimal covering of various active contours. The kinematic envelopes solved by the union algorithm and by ‘Interim Provisions on Passenger Dedicated Lines’ (PDL) locomotive gauge temporary regulations are compared and checked with rolling stock gauge
Quantitative Analysis of Transverse Cracking of Rail Using Eddy Current Non-Destructive Testing
Authors: Song Zeng Lu , Yamada Tsutomu , Shitara Hideki , Takemura Yasushi
Published: December 2012

In this study, we analyzed transverse cracks in rails using eddy current testing. Quantitative analysis was performed on transverse crack defect signals ascertained by actual flaw detection and finite element simulation of the rail that had developed a central transverse crack. The conductivity and width of the finite element model were equivalent to those of the actual rail. By analyzing the distribution of eddy current on the rail surface, the relationship between the variation in the density of eddy current and size of transverse crack was obtained. Experimental and simulation results indicated that the application of eddy current testing in quantitative analysis of a rail flaw was feasible and would be a valuable reference in future research.
Application of Micro Capillary Groove Radiator to Electric Vehicle Power-Control Unit
Authors: Liu Bin Bin , Xu Guo Qing , Li Wei Min , Lin Gui Lin
Published: December 2012

According to the structural characteristics of the controller and micro-groove heat sink technique, a new cooling system was designed for high power control unit of electric vehicles. And an experimental comparison on the radiating effect of forced air cooling, micro capillary groove radiator and their combination was then carried out. The experimental results showed that when compared with air-cooling method, the higher the power is, the more significant the heat dissipation effect is. The air cooling unit alone cannot meet cooling requirements when the heating power reaches 30 watts, with temperature exceeding the allowable ceiling for power devices. The strong heat removal ability of micro capillary groove radiator has a better effect for diminishing local overheating of IGBT, and it’s more applicable to cooling conditions of large heat flux.
Research on Electric Weft Insertion Method for the Rapier Loom
Authors: He Yong , Fei Sheng Wei , Chen Yi Cong , Wang Bo
Published: December 2012

This paper, on analyses of the shortages of the traditional rapier loom weft insertion system such as unalterable motion rules and high machining accuracy requirements, introduces a new electric weft insertion method to the modern high-speed rapier loom, which converts single-direction rotation of a motor to linear reciprocation of a rapier with help of the spatial linkage. The new method can satisfy different weft insertion requirements by controlling the speed of the motor rotation, so that it greatly improves the weaving adaptivity of the loom for different wefts. The test results show that this new controlling method not only meets the technical requirements, enabling the gripper head to move without rigid and flexible impact, but also has good high-speed motion characteristics, in line with the requirements of high-speed weft insertion.
Novel Scanning Immersion Lithography for 3D Microfabrication
Authors: Chen Yi Cheng , Tseng Shi Chang
Published: December 2012

We propose the first time combining the merit of scanning and immersion lithography to fabricate 3D microstructure in this study. Via applying a matching liquid to reduce the diffraction error, the gap between the mask/resist becomes more tolerable. In addition, the liquid also act as a lubricant and a buffer for smooth movement of the mask/substrate. These advantages will benefit the performance of scanning lithography technique. The experimental results show that the large-area, 3D microstructure with excellent surface quality (Ravg<10 nm) can be successively fabricated based on this method. Besides, 3D microstructures with various geometries and functionalities can be generated by altering the shape of the mask pattern, or changing the scanning directions. The proposed SIL technique seems to be a promising way for fabricating 3D microstructure for optical applications.
Analysis on the Finite Element of Electromechanic Coupling of Flexible Gear in Electromagnetic Harmonic Drive
Authors: Ren Yu Bo , Xu Li Zhong
Published: December 2012

In the harmonic electromagnetic drive motor, the rotating magnetic field may deform gear as well as the shape of interaction electromagnetic fields, thereby resulting in the interaction between electromagnetic field and the structure field. By analyzing the electromagnetic-structural coupling relationship of the system and conducting discretization, this paper established the finite element coupling equilibrium equations of electromagnetic field and structure field and discussed the coupling conditions between two fields as well as the boundary conditions of various fields, thus deducing the expression of the force and displacement transmission on the interface of two physical fields. By finite element simulation of the system, the law of the radial displacement distribution of flexible gear changing with the system parameters, which has provided a basis for further study of electromagnetic harmonic drive motor.
Force Propagation of Flow of Granular Materials through an Orifice in Start up Stage
Authors: Zhu Hai Ping , Xia Bo Shi , Yu Ai Bing
Published: December 2012

In this paper, early stage of granular materials flowing through the orifice of a cuboid hopper with flat bottom is investigated based on the results generated by using the discrete element method. The results show that in the start up stage of the flow, a switch curve is formed between static and flowing particles, and a force arch on which the forces are very small is generated below the switch curve. Both curves propagate into the granular bed with the discharge of particles, and reach the top of the bed when a steady state is achieved.
Control Problems for the Models of Thermally and Electrically Conductive Viscous Fluid
Authors: Brizitskii Roman , Tereshko Dmitry
Published: December 2012

Control problems for the stationary magnetohydrodynamics equations of viscous thermally conductive fluid are considered. Solvability of these problems with electromagnetic and thermal boundary controls and stability of solutions for some cost functionals are studied. We develop a numerical algorithm and discuss some computational results.
Kinetic Study on Photopolymerization of TPGDA under Containerless Condition
Authors: Zhang He Peng , Zhang Qiu Yu , Dou Jin Bo , Xu Shu
Published: December 2012

The TPGDA drop was suspended in the atmosphere under acoustic levitation and induced by photoinitiation for polymer preparation at the first attempt. The kinetics of TPGDA photopolymerization induced by the UV light under containerless condition was studied. Compared to the normal condition, the average initial polymerization rate of TPGDA under acoustic levitation is relatively lower, while the final conversion is higher. Relative to oxygen inhibition, container effect plays a more significant role on the conversion in this polymerization system.
Development of Approaches to the Creep Process Modeling under Large Deformations
Authors: Murashkin Evgenii V. , Polonik Marina V.
Published: December 2012

We propose a mathematical model of large elastoplastic deformations with rheological features. As an example of applying the model relations, we present a solution of the boundary-value problem on collapsing process of microdefect continuity in elastic-creep-plastic materials under uniform pressure. In the case of a single micropore we obtained quantitative estimates of this process. The fields of stress and the residual deformation are computed.
Constitutive Modeling of Flow Behaviour of AISI 4340 Steel under Hot Working Conditions
Authors: Sanrutsadakorn Apichat , Uthaisangsuk Viton , Suranuntchai Surasak , Thossatheppitak Borpit
Published: December 2012

Using compression test on a thermo-mechanical simulator/dilatometer, hot deformation behavior of steel AISI 4340 was studied in the temperature range of 850-1150°C and strain rate range of 0.01-10 s-1. The resulted true stress-strain curves exhibited a peak stress at low strain values, after which the flow stresses decreased monotonically until higher strains, representing the dynamic flow softening. The stress level decreased with increasing deformation temperature and decreasing strain rate. The material flow behavior at elevated temperatures was described using a Zener-Hollomon parameter with an exponent-type equation. Additionally, the model was modified by compensating strain rate parameter. The stress-strain responses for the investigated steel predicted by the proposed model agreed well with the experimental results. It was confirmed that the modified constitutive equations provided a more accurate prediction of the flow stress under hot working conditions for steel AISI 4340.
Oxidation Behavior of Reheating Hot Work Die Steels
Authors: Choi Ji Ung , Lee Ho Sung
Published: December 2012

At hot working condition, forming tools must be durable at operating temperatures during continuous forming process and especially dimensional stability and corrosion resistant property are required. In this paper, oxidation behavior of several hot work die steels was studied at elevated temperature forming condition. It is shown that test specimens begin to form oxides at the surface during the initial heating period. Transient oxidation is observed during the initial stage of oxidation, in which the initial fast reaction rates may be related to local thermal instabilities such as fast nucleation of oxide grains due to microstructural variation or chemical potential differences through the thin initial oxide layer. When initial mass gain does not contribute to steady state parabolic law, the Pieraggi model is successfully applied to the high temperature oxidation of tool steels. Based on this information, suitable forming die material was selected for reheating application above 850°C.
Microstructure of the Acid Welding Slag
Authors: Zhang Yuan Bin , Zhang Kai
Published: December 2012

Several E4303 type welding electrodes with different coating compositions were designed and manufactured using TL-25 welding electrode extrusion press. Welding slags of these electrodes were collected after welding on the low carbon steel, then the microstructure and the phase constitutes of the slags were investigated by optical microscope,scan electron microscope (SEM), electron probe microanalyzer (EPMA), Transmission electron microscope (TEM) and X-ray diffraction (XRD). It was indicated that the slags were mainly composed of amorphous matrix and Fe2MnTi3O10 crystal phase. Fe, Mn and Ti were the main elements to form the crystal phase, while Si, Al and Ca were mostly distributed in the amorphous matrix. The formation of the crystal phase in the slag could be controlled by adjusting the amount and the proportion of Fe, Mn and Ti in the welding rod coating.
Fabrication of Spherical Bi Particles during Polyol Synthesis Using a Bismuth(III) Carbonate Precursor
Authors: Kim Ji Hwan , Lee Jong Hyun
Published: December 2012

Spherical Bi particles were fabricated through a polyol synthesis using a zinc bismuth(III) carbonate precursor, and the effects of processing temperature and time on the morphology and composition of the resulting particles were evaluated. It was determined that longer processing times or higher processing temperatures resulted in the gradual conversion of as-formed bismuth hydroxide into spherical elemental bismuth via bismuth glycolate. The temperature for the effective synthesis of spherical Bi particles under these conditions was 230 °C
Finite Element Analysis and Shape Optimization of Aluminum Alloy Automobile Energy-Absorbing Components
Authors: Liu Yan Jie , Ding Lin , Li Qing Fen , Wang Dan
Published: December 2012

In the present work, the structure optimum design and simulation analysis of aluminum alloy automobile energy-absorbing components was carried out by using Finite Element (FE) method. The numerical simulations were carried out using the software LS-DYNA. Automobile energy-absorbing components usually was made a mental thin walled tube. In the paper, the tube was adopted aluminum alloy material. The FE model of the tube was validated by comparing the theoretical results and FE model results. The good correlation of results obtained show that the numerical analyses are reliable. Attention was focused upon finding an optimum cross- section shape of the tube in order to improve the crashworthiness. Several types of cross- section were studied and compared. Results show that the crashworthiness of the tube improved obviously when square cross section with the grooves was adopted.
One-Dimensional Temperature and Stress Distributions Associated with Hyperbolic Heat Conduction
Authors: Wang B.
Published: December 2012

The classical Fourier heat conduction law gives sufficient accuracy for many practical engineering applications. However, it cannot exactly reflect the real physical mechanism of heat conduction by highly-varying thermal load, at very low temperatures, or at nanoscale. The hyperbolic heat conduction equation can better explain heat conduction in solids. However, such equation is very difficult to solve. This paper studies the temperature field for a 1-D plate and a 1-D cylinder. The associated thermal stress for a 1-D plate is also given. Only in these simple situations, closed form solutions are possible and are given. The results can be used in the future analysis of thermal shock cracking and reliability analysis of materials in modern science and technology.
The Burst Tests and Theory Analysis of CFRP Pressure Vessel
Authors: Zhang Lin , Lu Zhi Min , Zheng Yu Long , Zhou Guang Liang
Published: December 2012

8 pressure vessels of carbon fiber reinforced plastics (CFRP) have been manufactured with in the winding technology of same continuous carbon fiber–-amine system, new same flexible formula and same tension system. And the hydraulic bursting tests with the specimens were done in accordance with GB6058-85. The parameters of fiber strength, winding angle, geometric sizes and burst pressure were obtained by the tests. The theoretical analysis was done by conventional design method and reliability design method. The results show that: the theoretical calculating thickness of CFRP pressure vessel with by same parameters is thicker than practical thickness. This shows the performance of CFRP pressure vessel is related not only with fiber strength but also with material properties of resin matrix, tension and solidifying system of winding process. Because of CFRP (Carbon Fiber Reinforced Plastics) have many advantages which are high specific strength, high specific modulus, ablation resistance and low cost. Although the thing that composite materials have been substitutes for metal shell springs up soon, the application is much wide[1-6].
Analysis of the Pulsation in Aircraft Deicing System
Authors: Wu Meng Li , Yuan Jia Bin
Published: December 2012

Two methods are proposed in the paper to reduce the flow and pressure pulsation caused by the reciprocating pump in aircraft deicing system. First, the control algorithm for multiple phases of pumps is used to cut down the pulse energy among the pumps. Then the inflatable accumulator is used in combination with pumps to make the fluid more stable. At last, the simulation results show that the methods can effectively decrease the pulsation in the system.
Multi-Axis Vibration Power Generation Device for Automobiles
Authors: Kumagai Shunji , Suto Kenji , Okada Hiroaki , Kasai Makoto , Hashimoto Seiji , Nagai Nobuyuki , Fujikura Yoshimitsu , Takahashi Junpei
Published: December 2012

In achieving the practical use of vibration power generation, the challenges are that the energy to be generated is small and the vibration frequency range for efficient power generation is limited. So, it is needed to improve the output level and establish a vibration transmission structure capable of covering a wider vibration frequency range. In this report, we propose a multi-axis vibration power generation device that is mounted on the vehicle and capable of generating electric power from vibrations in the running vehicle and evaluate its principle model based on the stress analysis. For the model, we employed the structure in which the elastic body (a flat spring with piezoelectric elements on it) is deflected by mass vibration and the elements are bent and strained. We made two types of the principle models using the same elastic body; one is H-type having a mass on both sides of the elastic body, and the other is T-type having a mass on one side only, and conducted tests for the system identification of them.
Tool Path Optimization of 2D Contour Considering Stock Boundary
Authors: Wu Fu Zhong
Published: December 2012

Based on analyzing the existing algorithms, a novel tool path generation of 2D contour considering stock boundary is presented. Firstly the boundary points of stock are obtained by three-dimensional measuring machine. And the boundary curve is constructed by method of features identifying. The stock boundary is offset toward outside with tool diameter. An enclosed region is formed between the contour curves and the offset curves of stock boundary. The tool path is generated by form of parallel spiral by offsetting the stock boundary in the enclosed region. Finally the validity of present method is demonstrated by an example.
The Offshore Platform Rigid-Frame Strength Analysis Using ABAQUS
Authors: Yang Yuan Feng , Liu Lin , Zheng Yu Qing
Published: December 2012

The rigid frame joint node is rigid node. And each rod can not only withstand the tension- compression load, but also can bear the bending. For the complicated rigid frame, to work out every rod internal stress by artificial calculation is difficult. In ABAQUS, the wire model can be built to simulate the real rigid frame. After setting the attributes, loads, grid, computing parameters in the wire model, the reaction force, internal stress and deformation can be output in graphic. Then according to the relevant codes, the simulation results can be used to check the strength of rigid frame. It is verified that for analyzing the rigid frame strength, the modeling was convenient and results were accurate in ABAQUS, which greatly improved the work efficiency.
Modeling and Simulation of Hydraulic System of the Working Device of the Wheel Loader Based on Power Bond Graph
Authors: Zheng Jian Xiao , Duan Zhi Shan , Guo Bao Liang
Published: December 2012

Based on the working principle of the hydraulic system for the working device of ZL60 wheel loader, the power bond graph of its hydraulic system is established by using the power bond graph method under the different working conditions. The power dynamic equations of the system is written out according to the established power bond graph and the Simulink simulation model has been established under the bucket backward operating condition on the basis of the power dynamic equations of the system. This simulation will be carried out by Setting the simulation parameters of the hydraulic system, applying the Simulink software and compiling the M function file. Through these studies, the performance curve of the hydraulic system can be obtained.
Research on Data Acquisition Method of Characteristic Lines Based on Reverse Engineering
Authors: Zhang Hui
Published: December 2012

This paper researches on the data acquisition method in reverse engineering based on coordinate measuring machine. Firstly, it puts forward the data acquisition method of characteristic line based on the principle of path planning, then, it summarized the application scope of characteristic-line method by analyzing the examples of data acquisition of regular surface and free curved surface products, finally, it realizes the rapid data acquisition of product based on coordinate measuring machine.
The Reverse Processing of the Mouse Surface Based on Pro/E and Mastercam
Authors: Gao Dong Qiang , Yi Jiang Miao , Hu Lin , Lin Huan
Published: December 2012

It takes the mouse surface for example and introduces the general process of reverse engineering combining with the advantage of Pro/E and Mastercam,including using CMM for the data acquisition, using Pro/E for data preprocessing and model reconstruction, using Mastercam for processing the cavity and arranging actual processing on CNC with wax model to achieve the End-entity. Thereby, it provides a practical approach on reverse engineering for complicated product.
Elastic Constants of Eutectic Composite Ceramic Containing Parallel Lamellar Inclusion
Authors: Fu Yun Wei , Liu Xie Quan , Ni Xin Hua , Cao Hong Na
Published: December 2012

The eutectic composite ceramic is composed of parallel lamellar inclusions distributed in the matrix. First, the recessive expression for the effective stress and the flexibility increment tensor of eutectic composite ceramic are obtained according to the four-phase model. Second, the analytical formula which contains elastic constant is given by applying Taylor’s formula. The eutectic composite ceramic is transverse isotropy, so there are five elastic constants. Third, the effective elastic constants of composite ceramics are predicted.
Impacts of Melt Spinning and Mn Replacement on Electrochemical Hydrogen Storage Performances of Nanocrystalline and Amorphous Mg2Ni-Type Alloys
Authors: Zhang Yang Huan , Cai Ying , Yang Tai , Hou Zhong Hui , Zhang Guo Fang , Zhao Dong Liang
Published: December 2012

The Mg2Ni-type alloys with a nanocrystalline and amorphous structure have been confirmed possessing superior electrochemical hydrogen storage kinetics. The melt-spinning technique is used to preparing the nanocrystalline and amorphous Mg2Ni-type alloys with the nominal compositions of Mg20Ni10-xMnx (x = 0, 1, 2, 3, 4). The impacts of the melt spinning and the replacement of Ni by Mn on the structures and the electrochemical performances of the alloys are investigated systematically. The analysis of the structures by XRD and HRTEM reveals that the replacement of Ni by Mn facilitates the glass formation in the Mg2Ni-type alloy, and the amorphization degree of the as-spun alloys increases with the growing of the spinning rate. Furthermore, the replacement renders the formation of secondary phases MnNi and Mg instead of altering the Mg2Ni major phase in the alloys. The measurement of the electrochemical characteristics by an automatic galvanostatic system indicates that the discharge capacity and cycle stability of the alloys dramatically grow with the rising of the spinning rate and the amount of Mn replacement, with which the high rate discharge ability (HRD) of the alloys first augments and then falls.
Study of the Difference in Microstructures and Properties of Cold Rolled Dual Phase Steel with Different Composition
Authors: Wang Hui , Lin Cheng Jiang , Deng Zhao Jun , Liu Ji Bin
Published: December 2012

The difference in microstructures and properties of 600MPa cold rolled dual phase steel with the different composition had been studied in this paper. It can be noticed that the Si-Mn-Cr steel have finer ferrite and more martensite whose content is about 25%; the Mn-Cr-Mo steel have coarser ferrite and some coarse pearlite as well as little martensite; the microstructures of the Mn-Al-Mo steel are consist of mainly ferrite which have even grain size and 16% martensite which distributed homogenously along the ferrite grain boundaries. The difference in microstructure makes the steel own the different properties. The Si-Mn-Cr steel has the highest tensile strength and yield strength but the worst elongation, the Mn-Cr-Mo steel has the lowest tensile strength, the Mn-Al-Mo steel has the an excellent mechanical properties with low yield strength and high tensile strength as well as higher elongation.
Adsorption Studies on the Removal of an Herbicide (Atrazine) Using Activated Carbons Prepared from Agricultural Waste Sugarcane Bagasse
Authors: Chang Ken Lin , Shih Yi Hsuan , Tseng Chao Heng , Chen Shui Tein , Chen Chih Cheng
Published: December 2012

A potassium hydroxide activation method is used to derive activated carbon (AC), which has high surface area of 1,324.62 m2/g, from agricultural waste, i.e. sugarcane bagasse. The adsorption capacity of AC for Atrazine, a widely used herbicide, in aqueous solution is evaluated at different initial Atrazine concentration, temperature, and pH. The results show the maximum adsorption capacity of Atrazine is proportional to the initial concentration of Atrazine. The amount of adsorption is inversely proportional to the temperature, although there is not significant decrease of adsorption capacity when temperature rises. Furthermore, the pH value has no influence on the adsorption of Atrazine, which shows the AC made of sugarcane bagasse has great performance in adsorption over a wide range of pH values.
Research on the Morphology and Mechanical Properties of 304 Stainless Steels of Intergranular Corrosion
Authors: Cai Guo Sheng , Wang Du Xiong , Chen Rong Fa , Wu Long , Pan Yi , Liu Tao , Li Qing Qing
Published: December 2012

In the paper, the steel intergranular corrosion of 304 stainless steels was studied in detail with the method of copper sulfate. The macro morphology, mechanical property and metallurgical structure were also discussed by contrast of before and after corrosion. The results indicated that many trans-crystalline cracks and micro cracks were found on the surface of stainless steel. The max bending force was decreased from 7.225KN to 4.926KN; the deposited carbide was seen on corroded grain boundary with the dropping of grain. The conclusions are important to analysis of surface corrosion of stainless steel.
Formation Energy Calculations of Impurity Elements at Substitutional or Interstitial Sites in Silicon
Authors: Hatanaka Hiroyuki , Hayafuji Yoshinori
Published: December 2012

One of promising candidates as dopants for forming ultra-shallow and high conductive source/drain in future silicon devices has been proposed to be dimer or trimer co-dopants containing pairs or trios of different impurity elements. Making choice of a combination of the impurity elements with a small ionization energy is essential for the appropriate dimers and trimers. In this work we calculated total energies of silicon with substitutional or ineterstitial impurity elements and derived formation energies for the substitutional and interstitial impurity elements for the atomic number 1 to 83 with the exception of inert gas and lanthanum series elements. We present here the periodic table with the formation energies of the substitutional and interstitial impurity elements for determining the most stable site of the impurity elements in Si lattice. We can use this table as a database for calculating ionization energies of the impurity element.
Manufacturing Process Specification and Collaborative Decision-Making
Authors: Qiao Li Hong , Kao Shu Ting , Zhu Yi Xin
Published: December 2012

A majority of information in manufacturing is the process information which presents mobility. Such information reflects transforming process form materials to products. This research establishes a manufacturing process information model that presents uniqueness, validness, completeness and generality based in PSL. The model can provide necessary process information and related product, material and resource information required by systems for integrating and collaborative decision making. It then enables to build a collaborative manufacturing decision making process model which is capable of utilizing the process information model. By defining logic procedure, data wrapping and service invoking in the decision making process model, multi-manufacturing systems collaborative decision making will be implemented. Such method of manufacturing process information modeling and decision making process modeling is illustrated by examples of the collaborative creation of a part process plan and an assembly process plan considering actual manufacturing environment.
Analysis of Active Vibration Control in Damping Cantilever Beam by ANSYS with Material Properties
Authors: Dai Jing , Huang Zhi Xiong , Chen Zhuo , Dou Rong Yang , Shi Min Xian
Published: December 2012

It is possible to model transient dynamic analysis of different composite foam cantilever beams by ANSYS/Multiphysics. By the piezoelectric material's positive piezoelectric effect and negative piezoelectric effect, the active vibration control of damping cantilever beam has achieved through the APDL program. The analysis of the results indicates when the control ratio K kept constant, the vibration stop times and the material damping ratio were closely connected.