bluuebunny/crossref_metadata_2025 huggingface dataset:
Research on Temperature Detection Based on Spectrum Analysis of the Speckle Pattern Interferometry
Authors: Wu Jin Hui , Yang Rui Feng , Wang Gao
Published: December 2012

To improve the accuracy of the transient temperature detection system, Transient temperature inversion processing algorithms is proposed based on spectrum analysis of speckle pattern interferometry. The interference fringes is formed by speckle interferometry in the system, and due to transient temperature changes cause the material strain, so that the speckle interference pattern changes. the interference fringes on the measured surface is obtained by the area array CCD collection before and after deformation. The corresponding spectrum density function will changes by the changes of transient temperature, and the amplitude changes of center wavelength is inverted by the speckle pattern interferometry. Through detecting and calculating the ratio of the amplitude of the center wavelength, the transient temperature can be obtained by spectrum analysis. In the analysis and calculation for the function of transient temperature and material strain, material strain and interference fringes, derived the amplitude and phase function of the transient temperature change and interference fringes, so as to provide the necessary conditions for detecting the use of spectral density function temperature. Experiment using 660nm laser diode, SI6600 type area CCD detector to obtain the speckle pattern interference fringes, system extracts the amplitude ratio of the central wavelength from spectral distribution function, and by calculation and calibration the detection accuracy of temperature can be achieved of 2°C. Compared to traditional methods that is direct detection for interference fringes changes, the new methods improve the accuracy by nearly an order of magnitude. It is more accurate detection and better uniformity, better stability.
Assessment of Redundant Steel Structural Systems Considering Effects of Member Strength Variability on the System
Authors: Rasooli Amanullah , Idota Hideki
Published: December 2012

In the present study, the failure of basic redundant steel structural systems is investigated. By considering that each member of the system has brittle, semi-brittle, or perfectly plastic properties, the statistical behavior of perfectly brittle systems, semi-brittle systems, perfectly plastic and combination systems are evaluated, and the effects of the coefficient of variation (CoV) of members on the systems are investigated. Uncorrelated strengths with the same mean are considered for the system elements. By using the Monte Carlo simulation (MCS) method, maximum strength, yield strength and residual strength of the redundant steel structural systems are evaluated. The CoV of member strength is an essential parameter for statistical assessment of steel structural systems. In this study, the strength is defined random variable a selected normal distribution represents the random variable, for the member strength. The deformation capacity of the member is strongly depends to the characteristics of member strength, but the post failure factor has deterministic values, only for the combination system. The post failure factor is a random variable that represents the uncertainty, uniform distribution is selected to represents random variable, in combination system post failure factor.
Numerical Investigations of Different Seismic Retrofit Techniques for Flat-Slab Structures
Authors: Valente Marco
Published: December 2012

The construction of reinforced concrete (RC) buildings with flat-slab systems has become widely used in some high seismicity European countries. This type of structure is particularly common both for office and residential buildings, taking advantage of the reduced floor height to meet economical and architectural demands. Even though some national codes may include rules for the design of these structures, the provisions of Eurocode 8 don’t cover flat-slab frames used as part of the lateral load resisting system. Main results of seismic analyses performed on a six-story RC flat-slab structure are reported in this study. The structural response was predicted using both nonlinear static and dynamic analyses with artificial ground motion records with increasing intensity levels. Different seismic retrofit techniques were applied to enhance the seismic performance of the structure including: 1) insertion of shear wall; 2) confinement of column plastic hinge regions using FRP wrapping; 3) addition of RC column jackets. The predicted seismic performance of the retrofitted models was compared to that of the unretrofitted counterpart. Numerical investigations provide information about the seismic performance of a common type of RC structure not covered by the provisions of Eurocode 8 as well as the potential to mitigate the damage for varying earthquake intensity levels through different retrofit techniques.
EDA-Based Charging Algorithm for Plug-In Hybrid Electric Vehicle to Shift the Peak of Power Supply
Authors: Tazoe Takashi , Yamamoto Soushi , Onda Harunaga , Takeshita Hidetoshi , Okamoto Satoru , Yamanaka Naoaki
Published: December 2012

This paper proposes a charging algorithm which is based on the Estimation of Distribution Algorithm (EDA) for Plug in Hybrid Electric Vehicle (PHEV). The proposed algorithm shifts the peak of power supply, satisfies the requested State of Charge (SoC [%]), and minimizes the charging cost. The proposed algorithm uses flexible weight for charging and upper charging limit to each PHEV to minimize the charge amount in peak time. The simulation result shows that the proposed algorithm shifts the peak of power supply in commute time zones, satisfies SoC of 93% PHEVs, and reduces charging cost by 31% compared with conventional EDA algorithm.
Optimization of the Working Conditions of a Single Molten Carbonate Fuel Cell
Authors: Milewski Jarosław , Miller Andrzej
Published: December 2012

A mathematical model of a Molten Carbonate Fuel Cell (MCFC) is shown. The model is used to simulate an experimental lab-stand single fuel cell unit measuring 55 cm2. The comparison of simulated data against the experimental results is shown and commented on.
Method and Technique of Grade Recovery and Cascade Utilization (GRUC) Based on Sintering and Cooling Integration
Authors: Xie Guo Wei , Li Peng , Dong Hui
Published: December 2012

The key problems and causes of recovery and Utilization of sintering waste heat were analyzed firstly, on the basis of sintering and cooling integration , the method and technique of grade recovery and cascade utilization (GRUC) was put forward according to the first and second laws of thermodynamics. The waste heat was recovered in grades according to the quality firstly, and then different qualities of residual heat recovered were utilized in cascades. The higher temperature part of sinter cooling waste gas was used for power recovery, the medium temperature part was used for direct thermal utilizations, such as drying and preheating of sinter mixture, combustion supporting for ignition, hot air sintering and so on, and the lower temperature part was used for absorption refrigeration. Last, a 360m2 sintering machine of JTC was put forward as an example to validate economic feasibility of the process.
Research on Collaborative Operation System of Wind Power and Electric Vehicle
Authors: Cheng Lu , Ma Rui , Lu Hai Wei , Ma Hai Yang , Gao Xiao Feng
Published: December 2012

With the increasing of wind power capacity, the peak regulation has become a bottleneck in wind power consumption. This paper introduces electric vehicle as a distributed energy storage device. Based on the probabilistic model, it puts forward equivalent quantity model of electric vehicle charging. It uses the quantitative relationship to represent power. Hence the collaborative operation with wind power is realized. The simulation result shows that the relationship between electric vehicle’s equivalent number and wind power can be described by this model. It also analyzes the feasibility of wind power consumption by electric vehicle.
Experimental Research of Heat Dissipation of Notebook
Authors: Wang Du Ying , Li Mao De
Published: December 2012

The influences and protections of heat dissipation of notebook are discussed. Tests of heat dissipation for three types of notebook are made to analyze and understand characteristic between power dissipation and temperature rising. From the test results it is shown that the influence from power dissipation, environment temperature and fan speed are obvious and a better heat dissipation can be realized by means of forced convection of proper selection of fan speed.
New Construction Technology for Condenser Shell Module of Large Scale Nuclear Power Station
Authors: Xia Yong Jun , Wang Yan Long , Yin Yan Hui , Miao Qian
Published: December 2012

The shell is one important part of steam turbo-set condenser. Fangjiashan nuclear power project in Zhejiang Province is the domestic millions-kilowatt class PWR nuclear power plant. Its condenser shell modules have large size and heavy weight. At the same time by turbine house structure restriction, the traditional construction scheme is unable to satisfy the installation requirements. According to the condenser shell module structure characteristics and construction environment, the new construction technology such as four cranes integration operation, many times of changing hook, temporary hanging on the beam of steam turbine house, is studied and adopted. The supporting lifting frame is researched and developed. Four pieces of condenser shell modules with different hanging point size are successfully constructed. This can provide reference for the construction of similar equipment.
The Effects of Carbon Black Loading on the Characteristics of Carbon Composite Bipolar Plate by Utilizing Graphite Waste Products
Authors: Sadeli Yunita , Soedarsono Johny W. , Prihandoko Bambang , Harjanto Sri
Published: December 2012

Current energy resources derived from fossil fuels thinning, and the issue global warning make the relevant parties that concern about the environment has been trying to find alternative renewable energy. Among the renewable energy options, the fuel cell is one of the many alternatives studied by the researchers in the world. One type of fuel cell that is currently being investigated is the proton exchange membrane fuel cell cel. The utilization of graphite and carbon black waste product is expected to result in light-weight and cost-effective bipolar plates.by using recycle materials. In this paper, we used graphite EAF as reinforcement together with carbon black that comes from the coconut husk pyrolysis process and epoxy resin as a binder. We examined the effects of carbon black loading at 5 %wt and 10 %wt, which influenced by differential pressure applied on compression molding process on density, porosity, flexural strength and electrical conductivity of the resulting polymer carbon composite bipolar plate. Pressure was applied from 30 MPa - 60 MPa in increments of 5 MPa while maintaining constant temperature operation at 70oC for 4 hours. Maximum value of bipolar plate was achieved by 5 %wt CB at application 55 MPa, density of 1.69 g/cm3, the flexural strength was measured to be 48 MPa with the porosity of 0.7%, and electrical conductivity of 1.03 S/cm.We demonstrated that waste product such as graphite EAF and carbon black are a good candidate for manufacturing of polymer carbon composite bipolar plates.
Rigid-Flexible Coupling Dynamic Analysis of Excavator Drive Axle
Authors: Li Jin Ze
Published: December 2012

Based on drive axle basic structure of the wheel excavator, the paper established virtual prototype simulation model and built drive axle rigid-flexible coupling multi-body dynamic simulation model. According to dynamic simulation response results, it explored the curves of flexible body changed more smoothly when it reached steady state, as gear meshing force of key parts. Initial response of flexible shaft was more violent than multi-rigid body system, and the maximum mutation value reaching about 7%, where has hysteresis phenomenon. The research can supply important theory basis for the improving of wheel excavator drive axle working performance.
Method for Measuring Surface Mobility of a Finite Plate Subject to a Uniform Velocity Excitation
Authors: Dai Jue
Published: December 2012

Surface mobility is used to describe the dynamic characteristics of the power transmission over the contact area between two connected structures. Due to the complexity of structures, it is difficult to build analytical models for various structures to calculate surface mobility theoretically. Therefore, without well established theoretical model to apply, the best way is to measure the surface mobility of each structure separately to obtain its dynamic characteristics of the power transmission. This paper proposes a method to experimentally measure the surface mobility over a two-dimensional contact area subject to a uniform velocity excitation. An experimental model of a rectangular thin plate with two opposite simply-supported edges is built up to validate the method. A brass shim is used to simulate the condition of the simply-supported edge. The results show that the method of the measurement derived is practicable and the reason causing the errors of the measurement is also investigated.
Analysis of Structure Dynamic Characteristics of a Metal Plate
Authors: Zhang Chen , Yang Zhi Gang , He Yin Zhi
Published: December 2012

Modal analysis is a modern method to study structure dynamic characteristics. In this paper, computational modal analysis with Finite Element Method is applied to simulate an aluminum plate with the dimension of 160mm*240mm*1.5mm under different boundary conditions (Including free boundary condition and fixed boundary condition). The results of structure natural frequencies and mode shapes of this plate show obvious difference between the two boundary conditions.
Effects of Surface Tension on Drop Impact on a Horizontal Rotating Disk
Authors: Yuan Xiao Fang , Li Jing Yin , Zhang Bin
Published: December 2012

The impact processes of water and ethanol drops on a rotating horizontal aluminum disk were recorded and analyzed using a high-speed digital camera together with an image analysis program. The angular velocities of the disk were altered to study the effect of surface tension of drops on drop impact processes. The experimental results show that a lower surface tension will result in a higher tangential spread factor and a lower receding rate during the receding stage, for the drop impinging and depositing on a rotating disk. In addition, a lower surface tension of the drop tends to promote the occurrence of splash. The experimental results further verify a proposed correlation of splash-deposition boundary for drops impinging on a rotating disk. Both drops, though they have a quite different surface tension, experience four stages, with two new stages different from those of drops impinging on stationary surfaces. Their tangential spreading factors both increase obviously with the tangential velocity at the impact point, while their radial spreading factors vary a little.
Application of the New Interpolation Functions on Topology Optimization of Continuum Structure for Static and Mode Analysis
Authors: Long Kai , Wang Dong Sheng
Published: December 2012

To improve the convergence for topology optimization of continuum structure, a new material interpolation model is proposed. This function curve parameterized by certain penalty is similar to solid isotropic microstructures with penalization (SIMP) curve. In static topology optimization problem, the new interpolation function maintains the advantage of robustness and efficiency similar to the SIMP model. In low density, the ratio of density to interpolation function is kept in limited value. Localized mode problem is overcome naturally based on the new interpolation scheme in dynamic topology optimization problem. Two-dimensional numerical examples are used to test the proposed model and method.The results show that the proposed model and method are feasible and robust in topological optimization design of continuum structure.
Hamiltonian Duality Equation on Three-Dimensional Problems of Magnetoelectroelastic Solids
Authors: Li Xiao Chuan , Zhang Jin Shuang
Published: December 2012

Hamiltonian system used in dynamics is introduced to formulate the three-dimensional problems of the transversely isotropic magnetoelectroelastic solids. The Hamiltonian dual equations in magnetoelectroelastic solids are developed directly from the modified Hellinger-Reissner variational principle derived from generalized Hellinger-Ressner variational principle with two classes of variables. These variables not only include such origin variables as displaces, electric potential and magnetic potential, but also include such their dual variables as lengthways stress, electric displacement and magnetic induction in the symplectic space. Similar to the Hamiltonian formulation in classic dynamics, the z coordinate is treated analogous to the time coordinate so that the method of separation of variables can be used. The governing equations are a set of first order differential equations in z, and the coefficient matrix of the differential equations is Hamiltonian in (x, y).
On Spiral Spring in Elastic Deformation
Authors: Xie Long Han , Du Ru Xu
Published: December 2012

Spiral spring is one of most important components in mechanical systems. According to literatures, there are only few studies on spiral springs. Using the Castiliago’s method and Mohr’s theorem, the mechanic model of spiral spring in elastic deformation is developed. As a typical case, Archimedes spiral spring is studied in details and experiments are also conducted to validate the mechanic model. Experiment shows that the theoretical analysis and experimental result matches very well, therefore the mechanic model can be used to estimate the deformation of spiral spring and to guide and facilitate the design of spiral spring.
Effect of Exhaust Nozzle Diameter on Internal Flow Field Characteristics in Base Bleed Unit Simulator
Authors: Cao Yong Jie , Yu Yong Gang , Ye Rui , Zhang Yu Rong
Published: December 2012

For the optimal design of base bleed unit, a 2D-axisymmetric unsteady model was established and the effects of different exhaust nozzle diameters on the internal flow field were studied. Results show that the larger the exhaust nozzle is, the higher the depressurization rate and the mass flux are at the earlier stage of depressurization, and the lower the pressure, the temperature, the density in the base bleed unit and the flow rate at the nozzle outlet are. But at the later stage, the depressurization rate and the mass flux are smaller instead. The radial temperature is generally unchanged in most part far from the burning surface and increases near the burning surface at the earlier stage of depressurization, whereas it is lowest at the axis and rises up quickly along the radial direction at the later stage. The radial density distributes just oppositely.
Molecular Dynamics Simulation of Nanoscale Sliding Friction Process between Sphere and Plane
Authors: Yang Xiao Jing , Zhan Sheng Peng , Chi Yi Lin
Published: December 2012

Contact surface of nanoscale sliding friction represent some new features that are different from the macro scale sliding friction, which need to seek new analysis methods. Molecular dynamics simulation is an effective method to describe microscopic phenomena. Therefore, Molecular dynamics method was used to study mechanical behavior of contact surface of nanoscale sliding friction. A molecular dynamics model of hemisphere sphere sliding on rectangular solid plane was built. State change of the micro contact area and friction force variation in the process of sliding friction were observed and analyzed after solution and simulation. The results show that, at the beginning position of the sliding, with different contact depth, contact action region of hemisphere and plane generated the atoms displacement, re-arranged and close-packed accumulation is also different. The deeper the contact depth is, the greater the atoms close-packed accumulation is, and the greater the contact deformation is. In the process of sliding friction, the contact surface of the basal body has produced lattice destruction, surface upheaval and silicon atoms close-packed accumulation, and then formed furrow scratches. At the same time the silicon atoms of the hemisphere generated atomic migration obviously and adhered on the basal body surface. The top of the hemisphere was torn and peeled, which resulted in wear. The deeper contact depth is, the more loss of the material of the hemisphere is, and wear become heavier. The curve of friction force and sliding displacement in different contact depths shows that the deeper contact depth is, the greater friction force is. The friction force increases quickly at the beginning of the sliding. Then the friction force remains steady relatively at stable sliding phase. In subsequent sliding process, due to hemisphere was worn and the original contact surface changed in size, shape and configuration state, friction force decreases obviously. Besides, in process of sliding friction, due to stick-slip effect, friction force appears obviously fluctuations. Moreover, if the sliding speed is large the changes of sliding speed have less effect on friction force when the nanoscale sphere sliding on the plane at the different speeds.
Direct Numerical Simulation on Transition of an Incompressible Boundary Layer on a Flat Plate
Authors: Li Ning , Zeng Qi Hong
Published: December 2012

Direct Numerical Simulation(DNS) was carried out for laminar-turbulent transition of an incompressible boundary layer on a flat plate based on disturbance Navier-Stokes(N-S) equation in spatial mode with Massage Passing Interface(MPI) technology. Study on breakdown mechanism of laminar-turbulent transition was carried on. The effect of mean flow distortion on the process of breakdown in laminar-turbulent transition was investigated. Results indicate that change of instability characteristic of mean flow profile plays a key role during process of breakdown.
Rheological Properties of RLDPE/LLDPE Blends
Authors: Zhao Xue Yan , Luo Xue Gang , Lin Xiao Yan , Qi Xiao , Zhang Hong Ping , Li Ji Wei
Published: December 2012

Blends of recycled LDPE and LLDPE were prepared by the twin-screw extruder at different ratios. Recycled LDPE was used as matrix in this work, LLDPE was used to improve the properties of RLDPE. Virgin LDPE was used in this study as a contrast. Rheological properties of the blends were carefully evaluated by a Haake rheometer and compared with pure LDPE. Rheological analysis shows that virgin LLDPE will promote the normal flow of RLDPE in the a large content and hinder the mobility of chain segments when in a small content of LLDPE. Consequently, the blends show potential applications in high-value products.
Numerical Studies of Aerodynamic Performance of Gapped Flat Plates at High Angle of Attack
Authors: Tian De , He Wei , Wang Wei Long
Published: December 2012

In order to study the influence of gap to wind loads on the solar panel, aerodynamic performance of normal flat plate was simulated by various turbulence models with high Reynolds numbers. Time averaged mean drag coefficients and Strouhal numbers were analyzed and compared with other researchers' simulated and experimental results. The flow characteristics of 2D gapped flat plates with different gap sizes at high angle of attack were simulated based on Reynolds stress equation model. Time averaged mean pressure coefficients and Strouhal numbers of gapped flat plates with different gap sizes were compared. The corresponding influences of gap sizes to the pressure coefficients of gapped flat plates were obtained. The simulated results provide theoretical support for the engineering design of the solar panels.
Vibration Analysis of an Axially Moving Viscoelastic Beam
Authors: Zhao Feng Qun , Wang Miao Miao
Published: December 2012

Assumed that the viscoelastic material of the beam obeys the Kelvin-Voigt fractional derivative constitutive relationship, the governing equation of the axially moving viscoelastic beam is established by the D ' Alembert principle. Based on Galerkin method, the fractional ordinary differential equations of simply supported beam are obtained. Then, Haar wavelet algorithm based on fractional integral operator matrix is employed to numerically solve the resulting equations. The effects of moving speed on the vibration behaviors of moving viscoelastic beams are investigated.
Study of the New Exact Solutions of a (3+1)-Dimensional Nonlinear Evolution Equation
Authors: Zhang Ma Biao
Published: December 2012

By the symbolic computation system Maple and the Riccati mapping approach and a variable separation method, some new variable separation solutions ( including solitory wave solutions and periodic wave solutions ) of the (3+1)-dimensional generalized shallow water wave (3DWW) system are derived. Based on the derived solitary wave solution, some novel solitoff solutions are investigated.
Study on the Damping Properties of Multi-Layered Gradient Materials Based on Organic Hybrids
Authors: Ding Xin Bo , Liu Tao , Fu Bao Cheng , Han Jian
Published: December 2012

In this paper, the multi-layered gradient materials consisting of polarized polymers and small molecules were prepared and the damping properties were studied by DMA. The predicted and experimental results showed that, it was possible to obtain damping material with broad efficient damping range by two-layered hybrid materials, the value in the middle of two peaks could be improved by increasing the number of layers of the multi-layered hybrids and there was a higher minimum value. On the other hand, with increased number of the layers of the multi-layered hybrid materials, the temperature dependence of could be improved. For five-layered gradient materials, it was almost rectangular transition range with values for the area under the linear curve. Thus, it would be feasible in theory and experiment to broaden the efficient damping range by multi-layered gradient materials based on organic hybrids, which provided a new approach and solid basis for developing high performance damping materials with a broad and high damping range.
Sectionalized Mechanical Models of Drilling Tool of Trenchless Directional Drilling
Authors: Xia Hui , Dou Yi Hua , Wang Xin He , Xu Jiang Wen
Published: December 2012

There are three working conditions namely drilling a guide hole, expanding the guide hole and pulling back pipeline in trenchless directional drilling. The position of drill string in the wellbore and loads exerted on the drill string varied in different working conditions. The models of buckling analysis of drill strings under compression, mechanical analysis of drill string under axial compression near drill bit in inclined straight section, mechanical analysis of drill string with multi-centralizers under axial compression near drill bit in inclined straight section, mechanical analysis of drill string near drill bit under axial compression in horizontal section, mechanical analysis of drill string near drill bit under axial tension in horizontal section, mechanical analysis of drill strings near drill bit under axial tension in inclined straight section and mechanical analysis of drill string in failed well are established based on the characteristic of loads and trajectories in each section. The establishment of sectionalized mechanical model of drilling tool is the fundament of further study of force analysis, deformation analysis and stress analysis.
Analysis of Stress-Strain Distribution for Wire Rope of Traction Hoister
Authors: Wu Yu Hou , Sun Jia , Zhang Ke
Published: December 2012

Besides the material properties and operating environment, the strain and strain state of the wires in multi-stage twisted rope with large frictional contact force, as applied in traction hoister of suspended access platform, strongly influence their service life. For an accurate quantitative prediction of the performance and a proper understanding of the underlying phenomena, a detailed analysis of the stress-strain distribution along all individual wires is required. For this, a numerical model for a wore rope in traction hoister was describe to be considering the complex strand pattern, mutual interaction by contacts form surrounding strands and contact deformation, in this paper. The model well understood response of wire rope under an axial tensile load and twisting moment, and concise described the effects of rope deformation on the rotate ratio and slip behavior of the hoister. The results of this model were compared with the experiment analyzed, which showed that the inclusion of interfacial forces at the contact locations and their associated effects of internal force of helical wires is importance.
Experiment Research on Influence of Mud Density to Wear Resistance of TP140 Casing
Authors: Wang Xin He , Dou Yi Hua , Wang Xiao Zeng , Yang Jing Wen
Published: December 2012

Due to complex down-hole conditions and longer drilling time, there are serious casing wear in deep and ultra deep well. It is necessary to carry out a deeper research of the casing wear. Theory of casing wear and prediction method are not perfect in deep well and ultra deep well .The purpose of this paper is to obtain the wear efficiency and friction coefficient which is used to predict wear of the TP140 casing in down hole. A block-ring casing wear tester is specially designed and produced. The wear efficiency and coefficient of friction which is used to predict wear of TP140 casing in different density polysulfide water-based mud is obtained. The influence of the mud density on the TP140 casing wear resistance is analyzed. It is found that the larger mud density, the bigger casing wear efficiency and the friction coefficient.
Productivity Prediction of Horizontal Well with Sulfur Deposition in Sour Gas Reservoir
Authors: Hu Jing Hong , Li Zhi Ping , Wang Lei , Meng Ling Ye , Lu Ju Hong
Published: December 2012

With the development of sour gas reservoir, the utilization of horizontal well technology has a great significance. The accurate prediction of the productivity of horizontal well in developing sour gas reservoir will become more and more important. In this paper, productivity prediction formulas of the horizontal well are established with considering the effect of sulfur deposition on permeability. The effects of the length of horizontal well, the effective thickness of the reservoir, elemental sulfur deposition and reservoir heterogeneity on productivity can be analyzed by established formulas. According to the field case, the calculating results of improved Joshi’s equation approaches the real productivity, which means that it could be used to predict the productivity of horizontal well at initial stage during sour gas reservoir development. The results can be used as a reference for the development of similar sour gas reservoir.
Optimal Coupled Inversion for Jet Parameters in Flowing Ambient Fluid
Authors: Li Ming Chang , Zhang Guang Yu , Si Qi , Liang Shu Xiu , Sun Zhao Chen
Published: December 2012

A new multi-parameter optimal inversion method for jet ratio and jet angle is established by coupling data-driven model theory with variable density anisotropic turbulent buoyant jet model in this paper. In this method, firstly the multi-parameter matching cases of jet ratio and jet angle are computed by the jet model, and the solution space of internal observation site in the computation waters is constructed by numerical simulation results. Secondly, the nonlinear relationship between state variables (dilution degree) and control variables (model multi-parameter) is established by data-driven model theory. Finally the optimal solution is obtained by inputting the needed dilution degree to the relationship. The numerical results show that multi-parameter optimal coupled inversion method is efficient for the optimal jet parameters and has advantages of jet water mixing with environment water.
Study on the Rheological Behavior of Neat PLA Chips and PLA Composites for Meltblowing Nonwovens
Authors: Yu Bin , Sun Hui , Han Jian , Yu Peng Cheng , Xu Guo Ping
Published: December 2012

The PLA/tourmaline composites were prepared by co-extrusion of PLA chips and tourmaline fillers. Rheological behavior of PLA chips and PLA/tourmaline composites were analyzed using a capillary rheometer. Experimental results showed that the rheological curves complex viscosity of the PLA chips exhibited a non-Newtonian flow behaviour. Complex viscosity of the PLA chips decreased with the temperature increasing. A non-Newtonian flow behaviour was observed in all the PLA/tourmaline composites samples at lower shear rate. The complex viscosity of PLA blends increased with the input of tourmaline. The viscous flow activation energy of PLA/tourmaline blend melts decreased compared with that of neat PLA chips. Keyword: Rheological behavior; poly(lactic acid); tourmaline; meltblowing
The Dynamic Simulation of a Long Distance Natural Gas Pipeline
Authors: Peng Shan Bi , Liu En Bin , Du Xiao Chun , Hong Rong Lin
Published: December 2012

With the growth of the natural gas market, the long distance natural gas pipeline system is getting more and more important in nowadays. As a united and enclosed hydraulic system, the operation conditions of the whole line will be changed by the influence of the condition change in one station. On the one hand, the condition change made people analyze operation scheme more difficult, on the other hand, pipeline system operating conditions directly affect the relationship between the production and the sales of natural gas. Therefore, the operation of the gas pipeline must be optimized, which brings huge economic and social benefits. This paper constructed a simulation model of a long distance natural gas pipeline by TG.net, and then analyzed the change of the operating condition of the pipeline after a compressor station shut down, found out the regularity.
Spring’s Multi-Objective Optimal Design in Pre-Positioned Fixture of Shaft Pressing and Assembling Machine
Authors: Deng Zhi Feng , Zhang Zi Qiang , Li Run Dian
Published: December 2012

Aiming at spring in pre-positioned fixture of shaft pressing and assembling machine subjected to alternating load and impact load, high working frequency and easy to fatigue failure, to guarantee spring service life and make the fixture more application scope, a multi-objective optimal math model had been established in this paper. In the model, spring’s basic structural parameters are used as design variables; strength, stiffness, and spring index and so on are used as constraint conditions; spring fatigue strength safety factor and volume are used as objective functions. And the model had been solved by using the unified objective function method and LINGO software. The example operation result shows that optimal spring volume is smaller than one of traditional design. And design purpose has been realized.
Vibration Experiment of Shearer Walking Unit
Authors: Liu Song Yong , Luo Chen Xu
Published: December 2012

Through the thorough research on the related knowledge of the shearer running reliability, found performance quality of shearer walking mechanism directly affect the production efficiency and reliability of whole shearer, so the research puts forward based on the dynamic characteristics.For preliminary study on vibration condition of shearer walking unit during movement, establish shearer walking test-bed, and walking unit is tested by using three measuring points. Vibration law and affecting factors of walking unit was draw. Provide a theoretical basis for design study of walking unit.
Hybrid Excavator Shafting Torsional Vibration Analysis
Authors: Huang Zhong Hua , Xie Ya , Deng Yi
Published: December 2012

Hybrid excavator shafting finite element analysis model was established. Modal calculation results show that compared with traditional excavator, hybrid excavator shafting first modal frequency is decreased significantly. First modal shape and second modal shape are torsional vibration. Hybrid excavator shafting torsional vibration dynamic analysis model was established, dynamic calculation results show that cylinder pressure change is main reason of shafting torsional vibration. Maximum torsional angle is occurred at 2f0. Hybrid excavator shafting torsional vibration experimental table was established and maximum torsional angel experiments under different throttle angle were carried out. Experimental results show that maximum torsional angle is occurred at 2f0under different rotate speed. Incentive frequency of shafting torsional vibration under different rotate speed is mainly concentrated in 0.5f0~2f0. Main drive source of hybrid power system shafting torsional vibration is diesel engine, not motor.
Rocker Mechanism Study of Crank Angle between Extreme Positions
Authors: Su Hui
Published: December 2012

The extreme position angle θ 90 ° rocker in any position of the graphic features, crank angle between extreme positions rocker swing angle ψ and θ.
Research on the Design Loads of a Surface Warship
Authors: Chen Zhan Yang , Ren Hui Long
Published: December 2012

The design load plays an important role in research on structural analysis of surface warship. The methods for the design loads have been proposed by many famous classification societies rules. In this paper the methods of the design loads from the native existing classification societies rules and foreign rules were studied, and based on these rules, the design loads of a warship were obtained. Meanwhile, segment model self propulsion tests of this ship were performed in heading waves in the seakeeping tank to confirm the design values. Comparisons of calculation of classification societies rules with experimental data were also conducted and results were summarized in this paper. It is concluded that the evaluation methods from the rules don’t take full account of the importance of slamming，the slamming moments from rules are fewer and wave moments are too large while those from BV rules give relatively conservative design values for the surface warship.
Research on Combination Anti-Galloping Method between Interphase Spacer and Rotary Clamp Spacer for Transmission Lines
Authors: Liu Bin , Zhu Kuan Jun , Niu Hai Jun , Zhan Xue Ping , Li Xin Min , Di Yu Xian
Published: December 2012

The efficacy of single anti-galloping equipments is limited due to shortage of relevant galloping mechanisms or more complex wind and ice conditions. In this paper, a combination anti-galloping method between interphase spacers and rotary clamp spacers is proposed to avoid or reduce the “whole galloping” and “subspan” galloping phenomenon which occur notwithstanding installing interphase spacers. The combination method is designed using multi-mechanisms anti-galloping design, controlling phase-to phase clearance, affecting structural whole properties, and changing iced shape. The galloping critical conditions of wind and ice to excite “whole galloping” and “subspan” galloping are increased by using rotary clamp spacers than by using only interphase spacers. The anti-galloping effect can be improved greatly by using the combination method.
Aerodynamic and Structural Design of Composite Wind Turbine Blades
Authors: Chen Guang Hua , Tian De , Deng Ying
Published: December 2012

With 3MW composite blade wind turbine blade as an example, according to the momentum blade element theory, optimized the design of aerodynamic shape, established the Three-dimensional model of blade through coordinate conversion, and made the stress check of structure and modal analysis using the finite element method, and more detailed description of the design methods and techniques of large composite wind turbine blades
MOSFET Modeling Based on Electromagnetic Interference (EMI)
Authors: Yang Tian Peng , Ma Qi Shuang
Published: December 2012

On the basis of the lumped electric charge, the inner P type body region and the N-type drift region electric charge of VDMOSFET were respectively shown in three districts: accumulation, depletion, inversion. The application of carrier transport equation, continuity equation and Poisson equation, characterized different regions electric charge. According to the variation of the electric charge, the parasitic capacitances were determined, and the model parameters obtained by linear extrapolation and curve fitting. The MOSFET model was completed in MAST language. The results obtained experimentally with Boost circuit and by Saber software simulation confirm the accuracy of MOSFET model.
Analysis & Study of Harmonics’ Impact on Analog Integrator’s Calibration
Authors: Wei Xiao Feng , Dong Wei
Published: December 2012

Having studied harmonic’s impact on electronic integrator’s Calibration. The mathematics model of the integrator and the response of the integrator simulator to volt-second pulse periodic signal have been established through SIMUNLINK in the MATLAB, it theoretically analyzes the low-pass filtering characteristics of ideal integrators and the impact of pulse signal harmonics on approximate integrators. The experiment shows that the bigger the harmonics elements in the volt-second’s pulse signal is, the less accurate its calibration of integrator will be.
The Design of an Electromagnetic Damping Vibration Absorber
Authors: Jiao Xue Jian , Zhang Yu Zeng , Chai Shan
Published: December 2012

In order to improve vehicle performance, an electromagnetic damping vibration absorber was designed. The parameter formula of an electromagnetic damping vibration absorber was derived from the utilization of the electromagnetic induction principle. At the same time, the electromagnetic force which was generated by induction current replaced the damping force. According to the experimental data, the damping parameter was calculated by means of the response surface method. It showed that the application of the vibration absorber was feasible.
Design of Low Voltage Cell Fusion Instrument
Authors: Jiang Feng , Yu Jun , Chen Jian Jun
Published: December 2012

Aimed at the deficiency in the existing cell-elctrofusion devices such as high fusion voltage and so on, a low voltage cell fusion system based on micro system technology is developed. This system is composed by cell fusion chip and low voltage signal generator, and locating cells by precisely designed microstructure and signal. In this chip, small distance between one pair of microelectrodes reduced required voltage. It has advantages of low energy consuming, small bulk and operation safety and easily compared with the existence apparatus. The experiment shows the system can generate cell fusion signal to meet the need for fusing. It can be popularized.
Simulation of Power Transformer Windings Displacement Caused by Multiple Short-Circuit Forces
Authors: Li Hong Kui
Published: December 2012

This research studies the displacement on the windings of transformer due to multiple short-circuit forces. The power transformer winding deformations cumulative impact of multiple short-circuits are studied. the cumulative impact of multiple short-circuit deformation of laminated cylindrical shell with stiffeners model is established, the impact of accumulated deformation of multiple short-circuit of transformer winding is calculated with large deformation elastic-plastic theory , the text introduced by the theoretical formula for power transformer windings of the elastic-plastic deformation analysis of and winding to determine the stability have great significance, To verify the computation results, they are compared with those obtained using ANSYS software simulation.
Auto-Bäcklund Transformations Derived via the Implicit C-D Pair
Authors: Wang Xiao Li , Mei Jian Qin , Wu Zhen Hua
Published: December 2012

By the implicit C-D pairs, a new approach to auto-B¨acklund transformations of nonlinear evolution equations is presented in this paper. The auto-B¨acklund transformations for combined KdV and MKdV equations are obtained by this approach.
Evaluating nMOSFET ESD Protection Designs: An Overview
Authors: Chen Shen Li , Chen Guan Jhong
Published: December 2012

This work is referring to the various singer-finger/ multi-finger nMOSFET structures stressed by electrostatic discharge (ESD) zapping, and to evaluate the high current distributions in different ESD protection schemes. Eventually, these efforts can be used in many integrated circuits implementations. By using the TCAD and HSpice, due to the internal parasitic resistance differences in each one finger, which will obviously result in the non-uniform turned on phenomena. Meanwhile, with different interior parasitic capacitor in each nMOSFET structure, which will be inflected the device high-current-injection behavior, i.e., ESD immunity level.
Power MOSFET Devices and ESD Reliability Evaluations
Authors: Chen Shen Li , Lee Wen Ming
Published: December 2012

The electrostatic discharge (ESD) reliabilities in different power MOSFETs will be investigated in this paper. From the experimental results, ESD zap pulses at the gate terminal will cause electrons or holes trap in the gate oxide and loss the Si-SiO2 interface integrity, especially for the 100V nDEMOS, 200V nDEMOS, and IRF640, in which they do not have any ESD protection strategy. Electrons or holes trapped in the gate SiO2 layer will be caused the transconductance (Gm) or threshold voltage (Vth) of a MOSFET increasing or reduction, and which is resulted from electron mobility degradation. The RFW2N06RLE and RLD03N06CLE power VDMOS ICs, which with different kinds of ESD protection circuit, are less influenced by ESD pulses experimentally.
Kinetics of Non-Isothermal Degradation of PFA
Authors: Guo Zhi Hong , Lin Pei Jie , Xu Qing Yan , Shao Qun , Wang Yan Ping , Qiu Gao , Wang Yi Min
Published: December 2012

Thermal stability can reflect the thermal degradation speed of polymers during the melt processing. In this paper, we used Kissinger, Flynn-Wall-Ozawa and Coats-Redfern method to study the kinetics of non-isothermal degradation of PFA. The thermal degradation activation energy obtained from the Kissinger method, Flynn-Wall-Ozawa method and Coats-Redfern method is 228.5 kJ/mol, 213.9 kJ/mol and 237.4 kJ/mol respectively. The Flynn-Wall-Ozawa method indicates the thermal degradation reaction PFA is a secondary reaction.
High-Low Voltage Drive of Asynchronous Motor Based on PLC Software Circular- Allotting
Authors: Wang Juan
Published: December 2012

The system of high-low voltage drive experiment of asynchronous motor based on PLC software circular- allotting is introduced in this paper. Its control circuit is novel and concise, combination is convenient.
Design and Simulation of the Temperature Control System of Agricultural Product Baking Equipment
Authors: Liu Jun , Jia Zhen Wei , Guo Rong Xing
Published: December 2012

This paper is to design a kind of temperature control system that could satisfy the requirement of baking equipment used for farm product. The system installed an AT89S51 single chip microcomputer as controller. The structure of the system was loop-locked and the temperature was detected by a team of DS18B20 digital sensors. The simulation of the temperature control system was implemented by the Simulink. The result indicates that the system can realize the function of controlling the temperature variation of the baking house.
Characteristics Identification of Straightness Error on Error Separation Technique
Authors: Huang Li Ling , Huang Fu Gui
Published: December 2012

The straightness error was measured from a certain part surface by CMM. The paper expounded the principle of error separation technique, and separated the straightness error into deterministic error and random error. It proved strictly an opinion that random error is obedient to normal distribution. Extraction point of random error far outweighs the extraction point which is obtained from deterministic error. Based on the principle of sampling signal, a conclusion can be pointed out that utilizing the characteristic of random error to recover the signal of straightness error without distortion is feasible and normal distribution model can be used in the computer simulation to study the problem of extraction point.