bluuebunny/crossref_metadata_2025 huggingface dataset:
Test Unit Design of Magnetorheological Greases Conductivity Research Based on Labview
Authors: He Guo Tian , Chen Jie Sheng , Song Li , Ma Yan , Li Ming , Xu Ze Yu , Zhang De Sheng , Ran Ying Chun
Published: December 2012

This paper described the characteristics of open virtual equipment platform LabVIEW, and introduced the method to construct data collecting system using this platform. And developed computer controlled monitoring unit of magneto-rheological grease conductivity, tested the relation between magneto-rheological grease conductivity and external magnetic field, particle concentration, and thickness of magneto-rheological grease. In windows system, the virtual instrument constructed by using LabVIEW programming implemented the real time measurement, display, record of conductivity output, analysis its conductivity characteristics, and fitted the output electric resistance data and determined the best fitting curve. The experiment certified that this method doesn't need complex programming, reduces the programming time, and simplifies the development procedure, and increases the flexibility of detection system.
Molybdenum Mineralization Mapping Based on Hyperion Hyperspectral Image in Angou, China
Authors: Peng Guang Xiong , Chen Feng Rui , Pang Yong
Published: December 2012

Angou deposit locates in the southern part of east Qinling Metallogenic Belt. A few Mo-Pb deposits have been discovered in this region. This paper demonstrates that there is a close relationship between carbonitization and molybdenum mineralization. Therefore carbonitization can be an important prospecting marker for molybdenum. Four Hyperion bands, with the wavelength of 420nm, 803nm, 2324nm and 2385 nm respectively, were selected for principal component analysis to extract carbonitization anomalies. Field work results show good relationship between carbonitization anomaly and molybdite and molybdenum ore bodies. The zones with intensive carbonitization anomalies have good prospecting potential.
Beam Width Performance of the Adaptive Beam Former Based on Pseudo-Interference Technique
Authors: Chu Yi , Horng Wei Yau , Wang Shinn Fwu , Chau Yuan Fong , Wei Jeng Hua
Published: December 2012

In this paper, we examine the beam width performance of the recently addressed robust Capon beam formers. This adaptive array employs the estimated steering vector, injected noise, and pseudo-interference to provide robustness against direction mismatch. With the generalized side lobe canceller (GSC) as the underlying structure, we first derive the effect of angular mismatch on the estimated interference correlation matrix. Then, a simple approximate expression is presented for output signal-to-interference-plus-noise-ratio (SINR) of this new beam former. Based on this expression, the angular beam width of this robust beam former is investigated. Simulation results verify the analytically predicted performance.
The Application of an Improved Genetic Algorithm in the AUV Global Path Planning
Authors: Li Qi , Shi Xiu Hua , Kang Zhi Qiang
Published: December 2012

AUV global path planning often achieves by genetic algorithm, due to genetic algorithm’s local search ability is limited, resulting in two limitations: large amounts of algorithmic operations to meet the expected effect; there are some peaks after the inheritance in the paths. Thus we propose non-uniform encoding obstacle avoidance operator node deletion operator and smoothing operator. The result proves that the improved Genetic Algorithm finds a comparatively better path, achieves rapid and smooth global path planning by avoiding obstacle deleting redundant nodes and smooth operation.
Design of Substation Protection Device Based on IEC61850 MMS
Authors: Song Jin Hui , Kang Yi , Zhang Xu
Published: December 2012

This article is mainly targeted at domestic substation devices appear in poor interoperability and Statute conversion complex issues, proposed a cost savings and interoperability of new ideas. After the access to the abundant literature and practical research, with the current international universal iec61850 standard and Manufacturing Message Specification (MMS), designed a substations the protection model which is not require protocol conversion and savings the statute converted cost. This model has the basic features needed by devices; on the other device in the substation's design has some constructive significance.
Study on the Coupled Bending and Torsional Vibrations of Turbo-Generator Unit with Rub-Impact
Authors: He Cheng Bing , Wang Shi Chao
Published: December 2012

An increment transfer matrix equations based on step-by-step integration method and traditional transfer matrix method are deduced Combined with multi-mass model and Riccati method, the increment transfer matrix method is put forward, that can be directly used to analyze the dynamic response of the coupled bending and torsional vibrations of turbo-generator shafts with rub-impact. Taking a turbo-generator unit as example, the vibration character of rub-impact fault is analyzed when unit starts up. The research results show that rubbing will make vibration amplitude increase when the rotational speed is lower than the first critical speed; however, when the speed is higher than the first critical speed, rubbing will make the rotor mass unbalance reduce, thereby vibration amplitude will reduce slightly.
Identification Method of Tool Wear Based on Locally Linear Embedding and Support Vector Machine
Authors: Li Zheng Qiang , Nie Peng , Zhao Shu Guo
Published: December 2012

Aiming at the nonlinear characteristics of the tool wear Acoustic Emission signal, tool wear state identification method is proposed based on local linear embedding and vector machine supported. The local linear embedding algorithm makes high dimensional information down to low dimension feature space through commutation, and thus to compress the data for highlighting signal features. This algorithm well compensates for the weakness of linear dimension reduction failing to find datasets nonlinear structure. In this paper, acoustic emission signal is firstly made by phase space reconstruction. Using local linear embedding method, the high dimension space mapping data points are reflected into low-dimensional space corresponding data points, then extracting tool wear state characteristics, and using vector machine supported classifier to identify classification of the tool wear conditions. Experimental results show that this method is used for the exact recognition of the tool wear state, and has widespread tendency.
Research on Frictional Roller’s Strength of Endless-Rope Winch
Authors: Meng Qing Rui , Quan Jie , Hu Zhi Peng
Published: December 2012

The strength of friction roller for endless-rope winch is analyzed, and the unit beam mechanics model for friction rollers is established, the flexural deformation equations are derived base on relevant theoretical analysis and calculate. Meanwhile, the variation curves of the flexural solution and compression stress along with the direction of friction roller width are obtained by MATLAB software. Thereby provides the theoretical basis for design and selection of friction roller.
Simulation of Mould Hydraulic Vibration System Based on MATLAB
Authors: Liu Xiao Bo , Liu Zhi
Published: December 2012

Based on the mould hydraulic vibration mathematics model in connection with the operation of actual hydraulic vibration equipment, analyzed the dynamic characteristic of the mould hydraulic vibration system with the MATLAB/Simulink module. Through the simulation on hydraulic cylinder's output displacement with different input signal, it can be seen that the system can be used to achieve non-sinusoidal vibration and provide a credible basis for research of mould hydraulic vibration system precisely. The experiments prove that the result is reliable.
The Characteristic Analysis of Double Vibration Isolation Model Based on MRF and Piezoceramics
Authors: Zhang De Sheng , He Guo Tian , Li Ming , Song Li
Published: December 2012

with the rapid development of ultraprecise process technology, the precision of instrument is being improved fast. Then instruments are more sensitive to the vibration of environment. This paper took advantage of the controlled character of MRF’s shear force, using actuators made of PZT,and put forward the double vibration isolation model based on MRF and piezoceramics. Through the theoretical analysis we arrival at a conclusion that the model has a good Isolation effect on both high frequency vibration and low frequency vibration especially ultralow frequency vibration.
A Frequency Measuring Method with Photoelectric Coupling Apparatus
Authors: Ren Y.Q. , Dai G.L. , Zhang L. , Ma X.X. , Liu T.
Published: December 2012

The paper introduces a frequency measuring method with single-chip microcomputer and photoelectric coupling apparatus, and presents the principle, applied circuit and software design, characterized by wide-range, high precision and high speed.
Interference Uniformity Analysis Based on the Clearance between the Hole and Rivet
Authors: Liang Kang , Jiang Li Ping , Wei Hong Yu , Chen Wen Liang , Jiang Hong Yu , Xu Rong Wei , Wang Yu Bo , Yu Lu
Published: December 2012

The riveting quality has an important influence on the performance of the aircraft structure. The amount of interference can be an important indicator of the quality of riveted structure. The relationship between the clearance between rivet and hole and uniformity of interference is researched theoretically and experimentally against the aviation panel riveted structure. First, the riveting deformation stages are divided, and the deformation law is theoretically analyzed. The test scheme is designed and carried out based on the actual situation. Then, the experiment result is monitored and compensated. Finally, the relationship between the clearance between rivet and hole and uniformity of interfere is given out with the slope of interference as the uniform evaluation index.
The Modeling of Dust Bulk behind Shock Wave
Authors: Zheng Bo
Published: December 2012

We have studied the mechanism of interaction of shock waves with dust bulk, and built the model of stripping of boundary layer of dust entrained by shock waves, and calculated out the maximum uprising velocity of dust particle, and built the equation of dust outline with the equation of relaxation movement of a dust particle behind shock waves. The result is identical with that of experiments.
The E-Supply Chain Management Solutions for the Automobile Marketing
Authors: Hai Jian Wang
Published: December 2012

The Internet has changed the enterprise management mode too extremely. In China's automobile industry development, the traditional supply chain management (SCM) requirement can't adapt to the new situation of e-commerce. E-commerce supply chain management solutions based on the Internet automobile sales have been widely used in automotive industry. In this paper, firstly compares the difference between traditional supply chain management and traffic. Then provide information flow control solutions Automobile sales industries. In addition, puts forward an integrated management system in automotive industry order planning sales were introduced in detail.
Numerical Simulation and Calculation of Freezing Time of Soil
Authors: Jiao Yan Hui , Ren Zhong Gui
Published: December 2012

The mathematical model based on temperature formulation for describing freezing course of soil is presented and the explicit finite difference method is used to perform computer simulation of freezing time of soil in this paper. It seems to be satisfactory by comparing the numerical results by the method of TDMA with experimental data. It is significant for freezing process and freezing units, optimum design of practical engineering.
Task Allocation of Multi-Robot Systems Based on a Novel Explosive Immune Evolutionary Algorithm
Authors: Yuan Ming Xin , Jiang Ya Feng , Shen Yi , Ye Zhao Li , Wang Qi
Published: December 2012

To solve the task allocation of multi-robot systems, a novel explosive evolution - based immune genetic algorithm (EIGA) is presented. On the basis of the immune genetic algorithm (IGA), the population number of EIGA is increased quickly through explosive evolutionary mode, and then the better individuals are selected through the comparison of allelic genes, which can improve the population quality with the premise of ensuring the population diversity, and enhance the search speed and search precision of EIGA. Compared with the IGA and genetic algorithm (GA), the simulation results indicate that the proposed EIGA is characterized by quick convergence speed, high optimization precision and good stability, and the tasks are allocated rationally and scientifi-cally which realizes the task cooperation of multi-robot systems well.
Study on Mechanical Fault Diagnosis Based on IMF Complexity Feature and Support Vector Machine
Authors: Liu Wei Dong , Wu Hu Sheng
Published: December 2012

According to the non-stationarity characteristics of the vibration signals from reciprocating machinery,a fault diagnosis method based on empirical mode decomposition,Lempel-Ziv complexity and support vector machine(SVM) is proposed.Firstly,the vibration signals were decomposed into a finite number of intrinsic mode functions(IMF), then choosed some IMF components with the criteria of mutual correlation coefficient between IMF components and denoised signal.Thirdly the complexity feature of each IMF component was calculated as faulty eigenvector and served as input of SVM classifier so that the faults of machine are classified.Practical experimental data is used to verify this method,and the diagnosis results and comparative tests fully validate its effectiveness and generalization abilities.
Modeling File Distribution Process and Simulation Influencing Factors in P2P Networks
Authors: Chen Bao Gang , Hu Jin Long
Published: December 2012

In view of popular files downloaded largely are similar to infectious diseases spreading, the multi-species epidemic model with spatial dynamics in medical area is applied to describe the file distribution process in P2P file sharing system. And on this basis, basic reproduction number is applied to describe the corresponding constraints in file transmission that can be used to express if the infectious diseases to outbreak. By simulation experiments, we demonstrated the basic reproduction number can be well used to calculate ability of file distribution and to reflect efficiency variation through different parameters values.
Decoupling IPv7 from Replication in Link-Level Acknowledgements
Authors: Shen Yu Hui , Hao Han Zhou
Published: December 2012

Mathematicians agree that homogeneous archetypes are an interesting new topic in the field of programming languages, and researchers concur. In our research, we verify the evaluation of model checking. In this position paper we describe an encrypted tool for refining lambda calculus (VENDS), which we use to prove that the Internet can be made empathic, game-theoretic, and metamorphic.
Study on the Structural Dynamics of the Elevated Station in Rail Transportation
Authors: Mao Jian Hong
Published: December 2012

As the number of the urban population attains a continuous increasing these years, the carrying load of all kinds of transportation lines in society changes into heavier as well. For the purpose of fulfilling the services demands of the rail transportation, the elevated station has turned into a new type of transportation structure, and exercises a critical role in the reduction of the social transportation pressure. The elevated station is a body integrated by both the rail transportation and the elevated bridge, and is much stronger than the traditional structural model in the aspects of the carrying load and structure performance. In accordance with this point, the author emphatically analyzes the structural dynamics of the elevated station in rail transportation in this paper, with the purpose of bringing the using performance of the elevated station into better play.
The Forecasting of Short-Term Wind Speed on Wind Farm Based on Phase Space Reconstruction and Neural Network
Authors: Su Ying Ying , Ma Fei , Zhang Hai Yan , Liao Zhi Qiang , Jun Peng
Published: December 2012

The forecasting precision of short-term wind speed is not high for its chaos and time-varying. Aimed at the problem, the novel data space is reconstructed with the best embedding dimension and time delay according to the phase space reconstruction. On the basis, neural network (NN) is used as the modeling tool with the novel sample data. Meanwhile, the structure of NN is confirmed compared with the others on the precision. In the end, the model of short-term wind speed is able to be obtained. The results show that the method is available and the Mean absolute error (MAE) is decreased to 16.2% for 2 hours.
Investigation into Attenuation of Underwater Shock Wave by Air Interlayer Using Material Point Method
Authors: Chen Wei Dong , Yang Wen Miao , Liu Xue Kui
Published: December 2012

The performance of air interlayer on attenuating the explosion shock wave is investigated by using the material point method. To verify the numerical method, the detonation process in one water medium only was considered. The numerical results were in good agreement with the data calculated by the empirical formula and demonstrated the effectiveness of material point method. A series of two-dimensional simulations of underwater explosion with the air interlayer were studied. The research shows that the air interlayer can attenuate the underwater explosion shock wave effectually.
Auction Methods of Homogeneous Goods such as Mine and Energy Material
Authors: Rao Cong Jun
Published: December 2012

Multi-object auctions usually involve the sale of many homogeneous or heterogeneous objects. Aiming at homogeneous goods auction (such as mine auction, energy material auction), this paper introduces the research history and the newest research trends, and presents many widespread theoretical and applications problems. Moreover, assumptions, main ideas, and conclusions of literature related to homogeneous goods auction are reviewed and commented.
Difference of Soil Nutrient between Topsoil and Subsoil and its Influencing Factors
Authors: Liu Xiao Bing , Song Xuan , Chen Jie , Liu Peng Fei
Published: December 2012

Taking the representative alluvial plain of the Yellow River-Fengqiu county as example, difference of available K (AK), total (TK) and total (TP) between topsoil and subsoil and corresponding factors was studied. The result shows that average content of AK in topsoil is lower than it in subsoil, spatial variation of AK in topsoil is similar with it in subsoil. TK in topsoil shows more randomness than in subsoil. TP in topsoil has a stronger spatial correlation than in subsoil. The spatial distribution of TK and TP are quite consistent with landform in topsoil and subsoil, but AK does not have this trend. The difference of TK between two layers is related with surface deposit and irrigation condition. AK is mainly affected by surface deposit and farming intensity such as fertilization. The difference of TP is unrelated with elevation, the distance to the Yellow River, roads and water channel and residential areas.
The Study on Ecological and Environmental Applications to Coastal Wetland Park Planning
Authors: Yu Ling
Published: December 2012

Through the study of the ecological and environmental characteristics, based on ecological and environmental explore ways of the urban wetland park planning and design of the new method, the breakthrough only pay attention to content the traditional concept of space planning, through the space structure planning realize wetland park ecological and environmental functions, from ecological, safety, view and admire, close water, culture, economic research and other aspects of the urban wetland park comprehensive effect, pay great attention to the material empty between the ecological and environmental problems behind, and to realize the biodiversity of the wetland park protection and water environment protection goal to provide effective way.
A Review of the Present Status of Hydraulic Accumulator
Authors: Ma Xian Ting
Published: December 2012

A review is performed to introduce the characteristics of hydraulic accumulator comprehensively and describe the actual functions systematically, analyzes the key points of selections, applications and maintenance of accumulator, and looks forward to the application trends in the future.
An Energy Efficient Power Control Model for Wireless Communication Systems
Authors: Liu Yang
Published: December 2012

In recent years, green computing which refers to maximize energy efficiency during the product's lifetime has attracted more and more concerns. How to use energy effectively in wireless communication systems is also an important issue. In this paper, we propose an energy efficient power control model for wireless communication systems. To control power consumption in wireless communication systems, we design a cross-layer optimization method by a cross layer optimizer which could collect status information from any protocol layer to make optimization decision and send parameter change request to the protocol layers. Experimental results illustrate the effectiveness of the proposed model.
Modeling of Automatic Power Output Prediction for Wind Mechanical Generator
Authors: Shi Lei , Zhuo Yi , Kang Lin Juan
Published: December 2012

Due to the instability of the output in wind power, there exists some difficulties on wind power merger to electricity grid. The fast forecasting of output of wind power is in favor of reasonable allocation system and increase the possibility of power merger in a large scale. Based on the actual wind power data, this article utilizes the one order differential method to remove data unsteady and obtains the stable data. In view of the ARMA time series, a numerical prediction model of wind power output is established. The results show that the model has good precision and can be used in the production practice.
A Realization Method for Wheel Cylinder Pressure Fine Regulation
Authors: Wang Yan Bo , Chu Liang , Qi Fu Wei , Cai Jian Wei , Chen Chen
Published: December 2012

To realize braking pressure fine regulation, the characteristics of hydraulic system should be well known, and there be a proper control method. By testing pressurization of braking circuit, the relationship between wheel cylinder pressure and current of the inlet valve was summarized, and the right rule of inlet valve current changing was found according to demands of pressurization. Finally, real car tests were carried out, and results prove the feasibility of this method. System can realize pressure fine regulation by this method, and get the goal pressure of control requirement.
Design and Simulation of the Inverter on Subway Based on DSP
Authors: Ren Peng Biao , Yan Sha Sha , Li Hua Wei
Published: December 2012

This paper puts forward an inverter design method based on TMS320F2812A. For inverter part we adopt double closed loops control method, on the basis of the analysis of the inverter designed the controller parameters, and realized the digital control algorithm through TMS320F2812A. Introduce the design method of the hardware system, and give the flow chart of the software control. Finally simulate the double closed loops algorithm though MATLAB, and test whether the control algorithm is feasible.
Simulation Solving Active Force and Passive Force of a 3UPU-II Type Spatial Parallel Manipulator
Authors: Ye Yong
Published: December 2012

A CAD variation geometry approach and force/torque balance equations are proposed for simulation of the accurate active force and passive force of a 3-dof 3UPU-Ⅱspatial parallel manipulator. First, an initial simulation mechanism of the 3UPU-Ⅱspatial parallel manipulator is created. Second, a variable workload which is composed of a central force F and a central torque T is constructed and applied to the center of the platform in the simulation mechanism. Third, the whole F/T (force/torque) simulation mechanism of the 3UPU-II spatial parallel manipulator is created. Finally, the extension of the active limbs, the active forces and passive forces are solved and modified.
Research and Design for Relief Valve with Level 2 Pressure Regulating Based on AMEsim
Authors: Feng Ren Yu , Wang Hai Lan , Hao Zhen Jie
Published: December 2012

By the relief valve with level 2 pressure regulating structures AMEsim model to analyze the impact of various factors on the valve dynamic performance reasons; optimize the parameters of these factors in the theoretical support and click here to design methods of productionthe product test verification. The results prove the effectiveness of the proceeds of the correctness of the simulation results and the valve design and production process.
Research of the Control Strategy for Concurrency and Conflict of the CVM Based on the Predicted Retardation
Authors: Wei Yu Miao , Gao Qin He , Long Yong , Li Xiang Yang
Published: December 2012

Based on topological graph theory, collaboration technique and other relevant theory, this paper carry out the research of exploring a technical path to solving the conflict of concurrency in CVM, Under the circum stances of conforming to logic and topological relationship , the attributes of timing sequence are studied emphatically, following the deeply analysis quantitatively and qualitatively, then the mathematical expression of predicted retardation and the control strategy are put forward, which builds a fair and friendly negotiation mechanism for occurrence priority distribution. Finally the OOT (Object Oriented Technology) based programming structure and realization means of the strategy are given in this paper. What elaborated in this paper has certain engineering and application value for the design of complicated virtual maintains system , conflict resolution of concurrency and the application of collaboration technique etc.
The Brushless DC Motor Adaptive Fuzzy PID Servo Controller Design
Authors: Shi Gong She , Huang Lei , Hu Wei
Published: December 2012

The brushless DC motor (BLDCM) non-linear and the complexity of the working conditions are likely to cause the conventional PID servo control performance is not satisfactory. In order to improve the performance of the BLDCM servo control system and PID parameter tuning efficiency, this paper designs an adaptive fuzzy PID controller. Fuzzy logic PID controller parameters Kp, Ki, Kd are adjusted online real time to achieve the effect of optimal control, the BLDCM speed is as to the control object, and in the Matlab of Simulink toolbox simulation is used to achieve speed closed loop of BLDCM. According to comparative analysis of the conventional PID and adaptive fuzzy PID of Dynamic response curve, adaptive Fuzzy PID quick start for brushless DC motors, anti-disturbance has better control effect.
Sliding Mode Control Scheme for Tele-Operation Manipulator
Authors: Tang Rui
Published: December 2012

Master and slave manipulator has been widely used because it can work easily in the working environment where the human beings can hardly work. In order to make the manipulator control system have good tracking performance, a control strategy based on sliding mode control was proposed for master-slave manipulator control system. Considering that the quality and stability of servo system will be affected by the chattering phenomenon in the SMC, a reaching law approach was used to reduce the chattering phenomenon. The proposed control strategy can make the master and slave manipulator have good performances on force and position tracking, and the chattering problem has also been alleviated. Simulation and experiments results show that the proposed control strategy can produce good performances on the force and position tracking, the problem of chattering has also been inhibited significantly, and the stability and quality of the master and slave manipulator has been improved as well.
Errors Control in NC Machining of Surface
Authors: He Ren Qi , He Fang , Huang Jian Ming , Li Shi Chun
Published: December 2012

The factors which influence the NC machining errors for surface in CAM process were analyzed. The methods were approved and researched on control machining errors by NC codes programming, technique system and control system.
Design of Goods Transport Control System Based on PLC
Authors: Dong Yu Lin , Lan He Hui
Published: December 2012

This paper introduces realization of the system based on Siemens PLC and IFIX configuration software. The system uses Siemens s7-300 PLC as the control center, and realizes inter-connection with Industrial Switches, control of the belt transport system, and automatic commodity information collection. It is proved that the system could carry out goods safely and stably. Moreover, it is effective to save the manpower and improve the efficiency.
Analysis on High Jump Technique Based on the Movement Mechanics Analysis Method
Authors: Yang Su Fei , Pu Peng , Cui Ying
Published: December 2012

This paper used high speed camera and computer as well as other modern technological means to analysis and study high jump technique of those domestic and foreign male high-jumpers. We analysed the differences between the high jump technique of different athletes from the run-up, the swing to the kicking and the takeoff, which was combined with mechanics analysis on the high jump. The analysis of the high jump technique based on the movement mechanics analysis method played an important role for athletes to improve sports skills and show the best sports posture. The purpose of this paper was to find out the gap between domestic and foreign players based on mechanical analysis of the sports by scientific analysis, and to make correct technology diagnosis thus providing scientific theory for athletes' scientific training, so as to promote the development of the sport.
Plastic Parts Die Design Analysis
Authors: Liu Yu Mei
Published: December 2012

The design of embedded a plastic mould design, make the mould can achieve the required by the plastic parts processing technology, and realizing automation production to increase production. Through to the analysis of the plastic parts for process, the general design of the mould structure, including sure cavity layout, sure pouring system, determine the parting surface and ejector institutions and pull the lever for design, cooling system, the design of the vents, in order to design a complete mold assembly drawing.
Fatigue Damage Mechanism Experiments of the K-Joint of Offshore Platform Model
Authors: Liu Gui Jie , Chen Min , Wang Xin , Li Ying Long , Zhang Jian Jun
Published: December 2012

Ocean environment loads such as wave, current and wind load shows random distribution. The coupling of different kinds of load can easily lead to the fatigue damage of offshore platform structure. The damage presented the multiaxial characteristics would be formed in different directions and planes. K-joint is the key but weak part of the platform structure. This paper associated macro ocean environment factors with material interior micro structure change to reveal the microscopic mechanism of fatigue damage evolution and fatigue damage evolution regularity. By building finite element model of the offshore platform K-joint and physical model, an experiment is done under the function of wave and current load and makes a good result. In this way, the relationship between them and fatigue life was established, and the result agreed with the theoretical predictions.
Application of Facies-Controlled Modeling in Physical Property Modeling – A Case of Tuo 128 Block
Authors: Tan Bin Tian , Cui Yong Bei , Li Xue , Zhao Hong Bing , Wang Feng Hua
Published: December 2012

The foundation and core of the phased modeling non-homogeneous modeling, Shengtuo oilfield geological modeling of the low porosity and permeability reservoir description of the characteristics of data is small, the accuracy is low, uncertainty factors. Using phased stochastic modeling techniques, log interpretation, based on data combined with core analysis, production performance and other known information, the sedimentary facies model as constraints holes, seepage property modeling to reduce the reservoir description is not uncertainty, combined with sequential Gaussian simulation method to establish a geological model of the actual production status of the oil region, the geological basis for the block rational development decisions and improve the effect of oilfield development.
The Numerical Method for Natural Frequencies Analysis of Simply Supported Ring-Stiffened Cylinder
Authors: Zhang An Fu , Sheng Mei Ping
Published: December 2012

Based on frequency equation of simply supported ring-stiffened cylinder, an alternative approach for calculating natural frequencies of ring-stiffened cylinder is proposed. Using some transformation techniques, the frequency equation is converted to determinant form of matrix pencil. Thus, solving frequency equation is equivalent to calculating generalized eigenvalues of matrix pencil. Then the natural frequencies of ring-stiffened cylinder are acquired with QR method. The result of QR method agrees well with that of bisection method and finite element method. By reducing order of the determinant, a simplified formula for calculating the minimum natural frequency of ring-stiffened cylinder is given. It proves that the simplified formula meets accuracy requirements when rings have small stiffness through comparing results from QR method and simplified formula. Using the approach of this paper, natural frequency’s curves of ring-stiffened shell are compared with that of unstiffened cylinder, while the effects of ring’s number and stiffness on natural frequencies are investigated.
Numerical Simulation of Arc-Type Slotted Finned Heat Exchanger
Authors: Gu Ping Dao , Liu Dong Hao , Yao Jing Lu
Published: December 2012

This paper is studying the fluid mechanics and heat transfer along the surface of are-type slotted fin in the finned heat exchanger by using the simulation software comsol multiphysics. The major study is the effect of the structure of fin to the fluid mechanics and heat transfer process, including the fin pitch, height of arc-type slit, the size of arc-type slit, the position of arc-type slit. And drawing the following conclusion: under the condition of low velocity, the fin pitch should be around 2.0 mm in considering the overall heat-transfer performance, and under the condition of large velocity, around 1.5 mm is better; When designing the arc-type slotted fin, the more larger the height of arc-type slit do, the better the overall heat-transfer performance; it is better if the start angle, as same as the position of arc-type slit, is less than 30°; the angle of arc-type silt ,as same as the size of arc-type slit, should be larger under the condition of meeting the demand of pressure drop.
Research on Vibration Transmissibility of Damping Sandwich Arch Profile
Authors: Han Fei , Wang Min Qing , Gu Jin Tao
Published: December 2012

For coupled plate-shell structure, restraining the vibration transmitted from plate to shell is an important approach to reduce the mechanical noise from the shell. In this paper, a damping sandwich arch profile with rubber as the material of the damping layer is presented and manufactured. Structure vibration response with arch profile applied to the coupled plate-shell test model is measured. And then Statistics Energy Analysis method is used to analyze the effects of major parameters on anti-vibration performance of the arch profile. Research indicates that using damping sandwich arch profile can restrain the vibration response of the shell effectively.
The Effect of Nozzle Breakaway Pressure on the Spray Pattern Formed
Authors: Peleowo Adedamola Najeem
Published: December 2012

The main function of a fuel injector nozzle is to break fuels into droplets, form the spray pattern, and propel the droplets into a combustion chamber. The amount of spray volume at a given operating pressure, the travel speed, and spacing between the jets of fuel can also be determined by the nozzle. In fuel injection, the smallest possible droplet size is desired for the most flow. This work presents an opportunity to use the Schlieren arrangement as a visualization method to view the flow of fuel from a three-hole fuel injector nozzle which cannot be seen by the naked eye. The jet flow of diesel Fuel was investigated by Schlieren photography. A test rig was designed and constructed to accommodate the nozzle; optical mirrors were arranged according to Schlieren specifications in order to allow the jet to be photographed. The breakaway pressure of the nozzle was varied between 60bar to 80bar. Each hole of the nozzle is 0.26mm in diameter and 120° apart; the third jet could not be seen from the images because the camera took x-y dimension images. The spray pattern observed from the two dimensional images of the jets developed were seen to be well dispersed. Su et al [3] found that emissions could be reduced in diesel engines if the injector nozzle produces smaller and more dispersed droplets.
Method of Lamp Fogging Discrimination
Authors: Liu Hong , Jiang Lan Fang , Hu Chang Guo , Chen Xian Li , Lin Jiao Di
Published: December 2012

This paper discussed the mechanism of internal fogging in automotive lamp based on the principle of water vapor condensation, and put forward the concept of the critical fogging humidity of lamp according to the structure and engineering characteristics. It given out a simple way to judge lamp fogging on the base of lamp temperature field, and verified the existence of the critical fog humidity by the test. All of these are very meaningful on the evaluation of the lamp's structure and raise the level of lamp design
Ride Comfort Analysis of Car Suspension Parameters on the Random Road
Authors: Yang Jian Wei , Zhang Guang Ye , Zhang Min Na
Published: December 2012

In this paper, based on the car suspension parameters of OEM, the ADAMS software was used to establish 1/4 car suspension model. To get the better ride comfort, the comprehensive analysis of spring stiffness and damping was conducted to obtain the optimal suspension parameters. The simulation results and the experimental results are consistent, which laid a good foundation for further analysis other design of cars.
Geometric Mobiles Innovative Design Method Based on the Computer Simulation Environment
Authors: Liu Zhuang Zhuang , Liu Zhifeng , An Guo Ping
Published: December 2012

Geometric mobiles is a new kinetic art which become a new technique combined with basic science and modern art. Geometric mobiles design and calculation by mechanics and mathematics in order to have a slowly and elegant movements. An innovative and efficient design method is first established based on virtual technology and polymorphs small cell centroid point analytical rule. The method reveals the intrinsic relationship between Geometric mobiles and mathematics & mechanics modeling, provides the mathematics foundation for art works innovative and next research.
Wireless ZnO Nanowires QCM Ammonia Sensor System Based on Zigbee Protocol
Authors: Wang Xiao Hua , Zhang Jian
Published: December 2012

In this paper, we present a zigbee wireless ammonia sensor system which based on quartz crystal microbalance (QCM) coated with ZnO nanowires as sensing element. This system concludes two parts: one is the base station which is constructed with zigbee coordinator linked computer, the other is called the sensor transmitter module which is zigbee coordinator linked ZnO-nanowires-modified QCM sensor. We use star network of zigbee protocol to construct ammonia wireless sensing system. Experimental results indicate that the wireless sensing system has quite good stability and reproducibility. The interaction distance between the computer and RFD can be as far as 100 m in a buliding. The proposed system is potential to construct the low-cost, real-time online wireless gas sensor system, which can be used to monitor the pollutants in the family and the harsh environment.
Preparation of Pb(Zr0.52Ti0.48)O3-Ni0.5Zn0.5Fe2O4 Bilayer Thin Films and their Magnetic and Ferroelectric Properties
Authors: Yan Fu Xue , Zhao Gao Yang , Song Na , Chen Yuan Qing
Published: December 2012

Ni0.5Zn0.5Fe2O4-Pb(Zr0.52Ti0.48)O3 (NZFO-PZT) composite films were prepared using sol–gel method on Si (100) substrate with different bilayer structures, namely, the NZFO/PZT (NP) and the PZT/NZFO (PN). Their structure, magnetic and ferroelectric properties were characterized by X-ray diffractometer (XRD), vibration sample magnetometer (VSM) and ferroelectric testing unit. Both the NP and the PN films exhibit coexistence of magnetic and ferroelectric properties. The overlapping sequence has much influence on the electrical properties. Whereas, such an overlapping structure of the films has slightly effect on its magnetic properties. The NP structured composite film is more suitable to get a promising magnetoelectric coupling.
Thermocapillary Convection in a Floating Half Zone
Authors: Liang Ru Quan , Duan Wen Jun , Duan Guang Dong , Ba Ja
Published: December 2012

A numerical simulation has been conducted to investigate the effect of the external vibration referred to as g-jitter on the marangoni convection in liquid bridge of high Pr number fluid by taking both the dynamic free surface deformation and ambient air effects into consideration. The Navier-Stokes equations coupled with the energy conservation equation are solved on a staggered grid, and the free surface deformation is captured by introducing the mass conserving level set approach. The pressure distributions within the liquid bridge under external vibrations were investigated, and the results show that the pressure in liquid bridge presents periodic oscillation under external vibration. The closer to the hot disk, the greater the relative pressure value is. Moreover, the surface deformation and the surface amplitude under external vibration were investigated as well.
Fabrication of Integral Core/Shell Ceramic Casting Mould for Hollow Turbine Blade
Authors: Wu Hai Hua , Li Di Chen , Tang Yi Ping
Published: December 2012

The paper presents an integral core/shell fabrication of ceramic casting mould for hollow turbine blades by combining SL (Stereolithography) with gelcasting. This method could guarantee the positional accuracy between ceramic cores and shell, thus achieving the rapid fabrication of complex turbine blade castings. The paper focuses on the design of resin mould for gelcasting, the preparation of ceramic slurry, the pyrolysis of resin prototype and the sintering of ceramic green body. The feasibility and effectiveness of above mentioned method were verified through successful manufacturing of hollow turbine blades with double-walled structure.
Effect of Austenizing Temperature on Microstructures and Mechanical Properties of Cr-W-Ni-Alloy Steel
Authors: Qu Xia , Wang Ying Chun , Cheng Xing Wang , Zhao Shuang Zan , Li Shu Kui
Published: December 2012

An investigation was made to determine the effect of austenizing temperature on microstructure and tensile properties of Cr-W-Ni-alloy steel. Correlations of microstructure tensile properties and austenizing temperature parameters were established. Analysis of optical and scanning electron microscope show that there were a lot of coarse spherical undissolved carbides dispersed on the lath martensitic matrix in as-quenched specimens when austenized at 900°C while there were only very little nanometer carbides when austenized at 1000°C and 1100°C. The tensile properties show that austenizing temperature had large effect on the mechanical property of the Cr-W-Ni-alloy steel. Oil quenching after austenized at 1100°C for 26 minutes followed with tempering at 260°C for 3h, Cr-W-Ni-alloy steel obtained best strength and ductility match.
Estimation of La1-xSrxMnO3 (x=0.15~0.5) Emittance by Thermal Irradiation Theory
Authors: Monfared Sara Hatefi , Tang Guang Ze , Ma Xin Xin , Mianji Fereidoun A.
Published: December 2012

La1-xSrxMnO3 (LSMO) has recently shown promising features as a metal-insulator material over a limited range of Sr doping (x=0.175 to 0.25). Its thermal property has been commonly measured through the very expensive calorimetric method. In this paper, a considerably more convenient thermal investigation approach to this issue through the thermal irradiation theory is proposed. LSMO compounds were synthesized with a wide range of x (0.15 to 0.5) using the precisely controlled Pechini sol-gel method. XRD phase structure analysis and XPS composition and chemical state study were adopted for quality assurance of the compounds. Resistance and infrared reflectance of the samples were measured respectively with the help of the four probe technique in temperature range of 150K to 380K and an infrared spectrometer over a temperature range of 153 K to 544 K. Investigations showed a good correlation between these two measures approving the metal-insulator characteristic of all the samples. Calculation of the total normal emittance (εN(T)) of the compounds was innovatively simplified using the measured reflectivity data through the thermal irradiation theory for graybody. Moreover, the results showed that every x ratio fabricated through the precisely controlled Pechini method presented a unique εN(T) characteristic with a different metal-insulator transition temperature.
Electrochemical Characteristics of Melt Spun Nanocrystalline and Amorphous Mg20Ni6M4 (M=Co, Cu) Alloys Applied to Ni-MH Battery
Authors: Zhang Yang Huan , Shang Hong Wei , Zhang Guo Fang , Yang Tai , Hou Zhong Hui , Zhao Dong Liang
Published: December 2012

The melt-spinning technique was used to synthesize the Mg20Ni6M4 (M=Co, Cu) alloys with nanocrystalline and amorphous structure. The microstructures of the as-spun alloys were characterized by XRD and TEM. The electrochemical hydrogen storage properties of the alloys were measured. The results show that the as-spun (M=Cu) alloys hold an entire nanocrystalline structure, whereas the as-spun (M=Co) alloys display a nanocrystalline and amorphous structure, confirming that the substitution of Co for Ni facilitates the glass formation in the Mg2Ni-type alloy. The discharge capacity and high rate discharge ability (HRD) of the alloys notably augment with the rising of the spinning rate. The action of the melt spinning on the cycle stability of the alloys is associated with the substitution element. For the (M=Co) alloy, the melt spinning exerts a dramatically positive impact, whereas for the (M=Cu) alloy, its impact is negative.
Development of Adsorbent from Banana Peel for Wastewater Treatment
Authors: Abdulfatai Jimoh , Saka Abdulkareem Ambali , Afolabi Ayo Samuel , Micheal Onazi
Published: December 2012

This study investigated the development and application of banana peel for the remediation of heavy metals (Pb, Zn and Cr). Batch experimental processes as well as conditions that might influence the sorption of the metals were investigated. These conditions include effects of pH, contact time, adsorbent dose, and particle size. The applicability of the sorption process was tested on wastewater. The adsorbent activated with 0.5 M H2SO4 showed the highest percentage removal of chromium ion (88.9 %) at a pH of 6. It has been found that particle size has no effect on the removal of zinc ion and it has also been found that the removal efficiency of lead and chromium ion decreased with increase in contact time and particle size. Also, it can be seen from the results that untreated banana peel waste increases the biochemical oxygen demand (BOD) and chemical oxygen demand (COD) values of wastewater. The results from the optimized method revealed the applicability of the method to environmental water samples. This study therefore confirms that banana peel is a promising adsorbent for the removal of chromium from industrial effluent.