bluuebunny/crossref_metadata_2025 huggingface dataset:
3D Numerical Simulation of the Influence of AGD Beams on Gas Distribution in COREX-3000 Shaft Furnace
Authors: Zhou Heng , Luo Zhi Guo , Zhang Tao , Sun Jun Jie , Han Li Hao , Liu Xiao Rui , Zou Zong Shu
Published: June 2013

A three-dimensional mathematical model is developed to describe the influence of AGD beams on gas distribution in COREX-3000 shaft furnace. The calculated result shows that with AGD beams installed, the pressure drop in furnace is decreased while the volume of low velocity zone at bottom of furnace is enlarged. AGD channels can lead reduction gas into shaft center, and increase the gas velocity at slots level, but it have little effect on gas distribution at upper part of the furnace. AGD beams are also good at restraining down pipe gas, and the volume fraction of down pipe gas declines from 9.89 % to 6.41 %, decreases about 35.2%. 2#COREX furnace with AGD beams is better at achieving uniform gas distribution.
Finite Element Analysis of Grinder Plate with Bone-Removal Facilities
Authors: Li Shi Long , Hu Zhi Gang
Published: June 2013

The grinder perforated plate with bone-removal systems has a unique design to improve the quality of ground meat. The pressure distribution on the grinder knife/plate interface during grinding of meat was investigated. The peripheral pressure on meat grinder plates during operation was greater than at the center thus hard particles are collected at the low pressure point. The mechanical models on the perforated plate surface created in MATLAB 7.0 for linear programming, and the 3D model of the perforated plate created in Pro/E software were imported into ANSYS 9.0 software and a linear static finite element analysis was performed. The visual deflection patterns the part experiences under "real world" loading conditions were obtained so as to complete the security check of strength.
Intelligent Optimization Design on Brake Experiment Platform
Authors: Liu Ke Ning , Ye Jun Yao
Published: June 2013

Design on brake is one of the most important aspects of the vehicle design. Large number of experiment must be carried out. But unable to carry out road test in the design stage, so we can only equivalent simulation test on the experiment platform. This requires to control the experiment platform. This paper firstly set up the model of rotational inertia and solve the model, then adopt gray prediction method based on gray theory to create model. To predict the drive current and detect it. We realize the model and find the result of the method are quite satisfied with the accuracy reached 0.9999.
Design of Beam Waveguide Antenna Structure for TT&C Ship
Authors: Pan Gao Feng , Mao Nan Ping , Liang Sheng , Xie Yong , Xue Jun
Published: June 2013

According to the special working environment of TT&C ships, S/X/Ka frequency TT&C system needs to be developed by using beam waveguide antenna technology in order to ensure Goddess of the moon project. Antenna structure design is one of the key technologies in the TT&C system. This paper designs the antenna structure detailedly, in which features and design parameters of antenna reflector, antenna seat, shaft angle detection and safety protection devices are given. The load of antenna structure is simulated and calculated based on ANSYS and results show that the designed antenna structure is reasonable, antenna parameters and components configuration are correct, all that fully meets the requirement.
Stability Features of the Saucer-Shaped Blend-Wing-Body Aircraft
Authors: Wang Lin Lin , Gao Ge
Published: June 2013

The saucer-shaped aircraft is a novel aircraft adopting blend-wing-body configuration. The linear perturbation theory based on the classic flight dynamics was used to analyze the longitudinal, lateral and directional flight qualities of the saucer-shaped aircraft under low speed conditions. The flight qualities were given. Meanwhile the aerodynamic characteristics of the saucer-shaped aircraft, the conventional aircraft and the flying wing aircraft were also contrasted to discuss their similarities and differences. The results show that the saucer-shaped aircraft has stable longitudinal mode, rollover mode and Dutch roll mode. The spiral mode is unstable. The saucer-shaped aircraft exhibits superior flight qualities and excellent comprehensive performances.
WEDM Performance Analysis Based on Entropy Fuzzy Evaluation
Authors: Yang Yong Qiang , Li Xiao Ying , Zhang Man
Published: June 2013

Based on entropy technology, combined with fuzzy evaluation method, five experiments parameters evaluation of high speed wire-cut electrical discharge machining (WEDM-HS) are done,which evaluation results are in accordance with process analysis results, verify correction of evaluation method, and provide some theory basis for fuzzy evaluation and optimization of machining process.
Effect of the Ignition Time on the Turbocharged Lean-Burned CNG Engine
Authors: Lu Xiao , Qu Da Wei , Pang Jian Xi , Lu Ji Fei
Published: June 2013

Experimental study on the combustion and emission performance of turbocharged lean-burned CNG engine by the ignition time. Speed of the engine is 1340r/min,1615r/min,1890r/min,with 25%, 50%,75%,100% load. Results show that when keeping other combustion boundary conditions unchanged, the effect of the ignition time on engine output torque and CH4 is little,the effect changes as speed varies from low speed and load conditions to higher level.However,the effects of ignition time on NOx emissions are huge.With the backward changes of the ignition time,NOx emissions has decreased significantly.
Optimization of the Anode Current Collector Layer Thickness for the Cathode-Supported Solid Oxide Fuel Cell
Authors: Kong Wei , Su Shi Chuan , Gao Xiang , Zhang Dong Hui , Yu Zi Dong
Published: June 2013

The influence of anode current collector layer (ACCL) thickness is studied for different ACCL porosity and different pitch width. The results shows conclusively that the output current density depends strongly on the ACCL thickness and a suitable choice of the ACCL thickness is very important for the high performance of a SOFC stack. Furthermore, the optimal ACCL thickness is found to be dependent linearly on the pitch width and the parameters for the linearity are given.
Study on the Motion Response of Buoy in Sea Condition
Authors: Wang Yan Gang , Tong Xing Hua , Zhu Lin Sen , Liu Yong
Published: June 2013

In the research of buoy wave power devices, earlier studies have indicated that the vertical cylindrical can absorb the most power from wave by comparing the loading conditions of several buoys (e.g.cuboid, vertical cylindrical, horizontal cylindrical, sphere, and so on) using the Froude-Krylov theory. However, it is not argued the motion response of buoys with the same basal area and the different basal shapes. In this paper, buoys with the same basal area and the different basal shapes are investigated by the mean of simulation. There are two modes for the floating system, one is with mooring line and the other is without. In both cases, the motions in horizontal (x axis) and vertical (z axis) direction will be studied.
Research on Parameters Indentification of Synthesis Load Model Considering Distribution Network Connection
Authors: Shi Guo Ping , Gu Peng
Published: June 2013

Synthesis load model considering distribution network connection can simulate actual performance of power grid, however, the model structure is quiet complicated, and distinguished result of parameters is not unique. To solve the above-mentioned problems, this paper proposes a load model parameters identification method based on sensitivity analysis by analysis the structure of synthesis load model with distribution network connection, The simulation results show the model is effective and proper, and the method can reduce computation and save computing time.
The Study Based on LABVIEW of the Positioning Accuracy of Spinneret Microporous Fine Machine
Authors: Liu Si Yu , Feng Pei , Yang Chong Chang
Published: June 2013

The microporous on spinneret has the characteristics of high precision, small pore size and large quantity. Spinneret microporous finishing operation is mainly used for removing the burr formed on the spinneret silk surface after micropores drilling and punching. The burrs seriously affect the quality of the spinning fibers. Micropore spinneret finishing plays a vital role in improving the quality of processing micropore. This paper introduces a system consisting of the spinneret micropore fine machine,then focuses on fine machine positioning system and proposes a high-precision positioning method of the microporous.
Properties of Water-Soluble Core-Materials Applied for LRTM
Authors: Xu Guo Dong , Zhang Yan Fei , Liu Ya Qing , Zhao Gui Zhe
Published: June 2013

Traditional RTM process were difficult to integrally manufactured Composite components with complicated internal structures because the metal molds are heavy and expensive. LRTM process and Water-soluble core-mould materials could be used to solve the problem due to their flexibility, mechanical properties and water solubility. In this paper, manufacturing process and properties of water-soluble core-materials were studied. Moreover, using Light Resin Transfer Molding (LRTM) process to manufacture a hollow-structure, made of carbon fiber reinforced polymer.
Nonlinear Dynamic Analysis of Rub-Impact Rotor System under Different Parameters
Authors: Xiang Ling , Hou Lan Lan
Published: June 2013

Nonlinear dynamic-behavior analysis of rotor system under different parameters is presented. The derivation of nonlinear dynamic equations under the action of rub-impact force is set up basing on Jeffcott model, and the system bifurcation characteristics and influences has been investigated under the ratio of operating angular velocity and the rotor’ natural angular velocity influence by numerical analysis. Bifurcation and dynamical behaviors of nonlinear of system with the changes of argument (that is the ratio of operating angular velocity and the rotor’ natural angular velocity) under several specific parameters are analyzed. The results show that the ratio, rotor eccentricity and rotor stiffness have great effect on the dynamical behaviors of nonlinear system.
The Analysis of the Pulverized Coal Deposition in the Pump Cylinder in Drainage and Mining of the Coal Bed Methane (CBM)
Authors: Sun Yan Ping , Zhao Ning , Qu Wen Tao
Published: June 2013

In drainage and mining of the coal bed methane(CBM),pump valve jams caused by the settlement of pulverized coal particles directly affect the normal production of the coal bed methane(CBM).From the study of the pulverized coal particle size,this paper summarizes the law of the pulverized coal particle size change in various stages of the coal bed methane(CBM) production well drainage and ming.By analyzing the pulverized coal particle velocity distribution along the pump cylinder,the viewpoint that the pulverized coal particle has a higher axial velocity in the central part of the settlement and has a lower velocity near the wall surface is put forward to.Based on the theory,the motion track equation of the pulverized coal particle can be got by calculation.Under the condition of considering buoyancy,fluid resistance and pressure drag,instant drop speed of the pulverized coal in water is calculated.
Research of Potential Energy Recycling System on Port Tyre Cranes
Authors: Tang Jing , Hu Yong , Su Li Juan , Hu Ling Hua , Hu Ji Quan
Published: June 2013

Port tyre cranes have the drawbacks of high energy consumption and serious pollution, whose potential is the most important latent energy being wasted. Some attempts to recycle the potential of tyre crane have attained certain energy-saving result, but their stability and reliability need to be verified. Based on the specific conditions of port tyre cranes with complex structure, a novel potential energy recycling system was proposed, with new applications such as a coaxial motor with dual armatures and variable torque and the nonlinear weighted coding dynamic magnetic technology. The results show that this system has characteristics of high energy utilization, excellent energy-saving effect and stability.
The Development of the High-Voltage Modulators Based on TM703FB Vacuum Tube for Auxiliary Heating on HL-2A
Authors: Li Qing , Xuan Wei Min , Mao Xiao Hui , Wang Ya Li
Published: June 2013

The auxiliary heating system with heating power of 6 MW has been built on HL-2A Tokamak. The High-Voltage modulators based on TM703FB vacuum tube are introduced, including the principle of modulator, system composing, and experiment results. Moreover, the waveform of protection while short-cirtuit is shown.
Numerical Simulation of Swirling Burner in Cold State
Authors: Li Min , Wang Chun Yu , Ren Li Ming , Zhang Bu Ting , Li Lu , Sun Lu Shi , Xie De Yong
Published: June 2013

The computer numerical simulation of swirling burner in cold state was taken in this paper. The swirling intensity and the expansion cone angle of the secondary air were the main simulation content. The outlet flow field and form of the combustor were got through the simulation, and the comparison of the airflow diffusion angle and the return flow zone were analyzed, and then the guidance suggestions on the design modification and operation adjustment of the existing swirl burner were proposed.
Test of Coal Slime Pumping by Single-Screw Pump
Authors: Yang Hua Xu , Zhang Shuang Yu , Jia Xuan Kai , Hao Xue Di , Wu Miao
Published: June 2013

Previous research on thick pastes such as coal slime was using two-cylinder piston pump as power equipment.Since the pressure fluctuation was big,flow measurement was not that accurate. In order to solve the problem, this paper will presents a feasibility study on conveying coal slime by single-screw pump. We used a single-screw pump as power equipment which conveying the coal slime with mass concentration of 64.5%-67.5% . Furthermore, we measured flow rate by self-developed flow meter and completed four groups of test. Through the data such as pressure, flow characteristic obtained from the tests, we have summed up the maximum mass concentration,pressure and flow rate.The results demonstrate the feasibility of conveying coal slime by single-screw pump.The original experimental data and the processing results conform to the theory of law.This paper provides the useful reference for the application of single-screw pump in the field of coal slime pumping.
Dynamic Analysis and Simulation of a New Steering Mechanism for Point-the-Bit Rotary Steerable System
Authors: Li Yuan Zhi , Niu Wen Tie , Li Hong Tao , Li Shuai
Published: June 2013

In oilfield exploitation, automatically directional steering can only be achieved with rotary steerable system (RSS). The designed well trajectories have become more complicated e.g. horizontal wells, extended reach drilling wells and 3D multi-target wells. To drill these complicated wells, new drilling tools are urgently needed. This paper proposed a new steering mechanism for point-the-bit RSS. The new steering mechanism uses a set of universal joints to avoid the high alternative strain on drilling mandrel, and it uses a specific eccentric planetary gear train to offset the drilling mandrel to achieve directional steering. Design procedure, Solid modeling, Force analysis and dynamic simulation have been discussed for further dynamic analysis towards the confirmation of the steering performance.
Transmission Ratio Optimization of Large Bus with Optimization Goal Normalization Processed
Authors: Ren Chun Xiao , Zhou Wei , Dai Wei Liang , Zhang Lu
Published: June 2013

During optimization of transmission ratios, dimension difference of power performance and fuel economy indicators exists. Aiming at this problem, large bus model based on Matlab is built and verified, a normalization processing method of optimization goal is proposed. Through normalization processing of power performance and fuel economy indicators of the optimization goal, the dimension difference problem is eliminated. An optimization example is conducted, proving the method is feasible.
Kinematics Analysis and Simulation of Main Components of Beam Pumping Unit Based on MATLAB
Authors: Huang Jian Long , Wang Yan Fang , Dang Xing Wu
Published: June 2013

This paper aims at the structure of the beam pumping unit structure, it is simplified into the corresponding crank rocker mechanism model. According to the beam pumping unit in actual working condition, the article study the main component motion regularity of the beam pumping unit, and using Matlab software to the motion law of calculation and simulation, I draw its angular displacement, angular velocity, angular acceleration curve, for analysis and research of walking beam type oil pumping machine main structure mechanical characteristics and the main moving parts of the failure of foundation.
Design and Testing of a Scroll Pump Efficiency
Authors: Litikorn Sukit , Kritmaitree Ponkit
Published: June 2013

This research designed and tested the efficiency of a scroll pump. The fixed and orbiting scrolls mathematic models were used in designing and constructing the scroll pump. The coordinates of the curves along the fixed and orbiting scroll wraps were calculated by SCILAB 5.1 program. The scroll coefficient is 3.0 mm while discrepancy of starting roll angle is radian. The scroll pump was modeled by Solid Work program and manufactured by a CNC machine. The testing facilities were design and constructed under the Japanese Industrial Standards (JIS B 8301) and used 0.5 horsepower, 3 phase AC motor, and motor speeds were controlled by a frequency inverter. The test speeds of motor were 700, 800, 900, 1000 and 1,100 rpm. The results were displayed as the relationship between water flow rate and pressure head (Q-H Curve). The Q-H curves were highly sloped. The maximum efficiency of the scroll water pump were 67.56 % at the volume flow 20.46 L/min. and pressure head 11.48 psig
Mode Analysis of Lattice Main Boom for Crawler Crane Based on ANSYS_WORKBENCH
Authors: Xu Ge Ning , Yang Jun Bin , Liu Jin Shuai
Published: June 2013

Crawler crane is widely used of large special equipment in the lifting process, its operating positioning accuracy and safety will directly affect the operational efficiency. Therefore, the dynamic characteristics and dynamic response law of crawler crane structure is revealed, the dynamic design is particularly important. Finite element modal analysis method is adopted for the crawler crane latticed main boom structure to obtain the boom natural frequencies and modes are obtained under the order modal. Through analysis of the frequency and the corresponding external load on the boom, the power modifications and avoidance measures have been proposed in order to avoid operating external excitation with the natural frequency of the structure occurring resonance, and to develop and improve the same type of crane to provide a reference.
The Application Research of the Hydraulic Breaking Hammer
Authors: Liu Hong Jun , Zhi Shu Ya
Published: June 2013

To research fluid pressure mixed cylinder design, fluid pressure control system. Discuss cylinder and piston manufacturing technology, leakage and pressure loss, affect the product's work efficiency and service life problems through the analysis of material mechanical properties and parts processing and assembly accuracy. To fight the different material and different work environment, can transform the corresponding attack frequency and amplitude. Through the dynamic analysis and calculation of mechanical system optimization design lays the foundation for intelligent broken hammer.
The Underwater Vehicle Cabins Wave Loads Linear-Simplified Calculation Method
Authors: He Xue Hong , Yang Yue , Liu Xin Meng , Tan Xiu Feng , Li Yan Yan
Published: June 2013

Based on the research of wave loads calculation methods for the submarine and ship, compared the date of wave loads obtained by strip theory with that obtained by linear-simplified calculation method, we proved the engineering feasibility of linear-simplified calculation method of wave loads on underwater vehicles cabin when sailing on the water surface and near the water surface, the linear-simplified calculation method shorten the calculation cycle and guarantee the engineering accuracy.
Study of Influence on Auto-Weapon Launching Performance by Nozzle Structure
Authors: Xian Dong Peng , Liao Zhen Qiang , Qiu Ming
Published: June 2013

Technology of reducing the recoil force by jet gas is a new effective technology to reduce recoil in recent years. In order to understand deeply the influence of Laval nozzles structure to achieve low recoil force on auto-weapon, two-phase flow model was developed and a machine gun as the experiment object was used for numerical analogy, analogy the influence of the efficiency of recoil reduction about nozzle angle and nozzle length, etc.
Study on the Nanocomposite Foam of Cardanol Phenolic Resin and Organo-Modified Montmorillonite
Authors: Niu Ming , Wang Guo Jian
Published: June 2013

In this article, a series of novel phenolic resin modified with cardanol were synthesized. The influence of reaction condition and cardanol content on the structure and properties of phenolic resin was evaluated. The nanocomposite phenolic foam was then prepared by infusing the organo-modified montmorillonite (OMMT) in the synthesis step of cardanol phenolic resin to produce nanocomposite phenolic foams. These phenolic foams were characterized by FTIR, XRD, SEM and TGA. And the mechanical properties and fire performance of these nanocomposite foams were also measured. The results showed that the cardanol component could reduce the crosslink density of phenolic foam and thus improve the mechanical properties; the OMMT platelets were 3~10μm in diameter and 40~50nm in thick. These platelets can exfoliated and dispersed well in the nanocomposite due to the hydrogen-bonding between organo-modifier and phenolic matrix and improve the thermal stability, fire resistance and also the mechanical properties of nanocomposite foam.
Reliability Analysis of Nuclear Power CNC Wheel Groove Milling Machine Based on Gray Theory
Authors: Li Zhi Wei , Song Dan Lu , Mo Cai You , Chen Yu Tao
Published: June 2013

The reliability data of nuclear power CNC wheel groove milling machine is so few that the reliability can not be predicted by traditional reliability prediction method;or the reliability prediction error is large. A reliability prediction method of nuclear power CNC wheel groove milling machine based on the gray theory is proposed in this paper. Establishing the reliability model of gray theory, the reliability of machine subsystem is determined. Then the relationship between the corresponding average fault-free time and system reliability is realized. The gray comprehensive correlation between theoretical output of the model and the actual system reliability is established, the overall reliability of the nuclear power CNC wheel groove milling machine is determined. For system reliability analysis and system maintenance decision research puts forward a new thinking path, have a good applied foreground. Key words: the nuclear power CNC wheel groove milling machine; gray theory; average fault-free time; system reliability; reliability analysis.
Modal Analysis of the 1.5MW Wind Turbine Tower
Authors: Cao Bi Feng , Yu Hui
Published: June 2013

The paper uses the finite element software ANSYS to establish a 1.5 MW horizontal-axis wind turbine tower model as an example and works on the modal analysis. The modal analysis takes into account the totalmass of wind rotor and nacelle and assumes the bottom of the wind turbine tower is fully constrained. The result shows that the natural frequency of the 1.5MW wind turbine tower is not coincident with the excitation frequency of the wind turbine, and the wind turbine can operate stably at the design condition.
Structure Design of Precision Horizontal Machining Center and Multi-Objective Optimization of Large Structural Components
Authors: Yun Qing , Niu Wen Tie , Wang Jun Qiang , Zhang Li
Published: June 2013

This paper presents the technical process of machine tool design and multi-objective optimization of large structural components based on Pro/E and SAMCEF. The main contents include: the design process of the machine tool layout and the large structural components; finite element modeling methods of the fixed joint, screw-nut joint and guide-slider joint; the optimization method of large structural components based on response surface model. A precision horizontal machining center is used as an example to verify the correctness and feasibility of the method.
Numerical Research on Ship Motions in Oblique Irregular Waves
Authors: Wu Ming , Shi Ai Guo , Wang Zuo Chao , Wang Xiao , Ying Rong Rong
Published: June 2013

A 3D viscous numerical wave tank (NWT) was established based on computational fluid dynamics simulation method, and oblique irregular waves were generated by defining inflow boundary conditions. The motions of free surface ship in oblique waves were predicted by solving the Reynolds Averaged NavierStokes (RANS) equations describing the flow around ship. The kinematics equations of rigid body were solved according to the calculation results (forces and moments) in each time step. The heave, roll and pitch transfer functions for container ship model S175 in oblique waves were obtained. The comparisons between simulation results and linear strip theoretical results were carried out, showing good agreement, which demonstrate the present research can provide an effective way to predict seakeeping characteristics.
Effect of Wheel-Rail Contact Geometry Relationship on Vehicle Dynamic Performance
Authors: Wang Yi Jia , Zeng Jing
Published: June 2013

With the rapid development of high-speed railways, wheel and rail wear has become increasingly serious due to the acute wheel-rail interaction. During the operation of high speed vehicle, complicated wheel-rail contact force will lead to wheel profile wear, which will worsen the dynamic performance of vehicle system, or even influence the safe operation of vehicles. In order to ensure the vehicle dynamic performance, right now regularly wheel re-profiling has to be adopted. Therefore, the study of wheel profile wear and its effect on vehicle dynamic performance is very important [1,. The purpose of the paper is to study the variation characteristics of vehicle dynamic performance with respect to the wheel profile wear through numerical simulation and field test.
The Dynamic Simulation and Strength Analysis of the Integrated General Suspension Rack Connector for an Ejection System
Authors: Zhen Jian Bin , Xu Cheng , Wang Tao
Published: June 2013

Because the impact of the connector is very important, the mathematics calculation model for the key components of the integrated general suspension rack for an airborne ejection was established, which were under the two questions of safety hanging and accuracy ejection. The integrated general suspension rack was operated by high pressure gas which was generated by the burning of the ejector cartridge, and the entire movement process of the integrated general suspension rack pushing the piston to unlock the locking mechanism and completely discarding from the airborne was analyze using the dynamic theory of gases. The modified and the original design plan for the integrated general connector were analyzed by the strength analysis. Through analysis, compared with original design, the improved design can well achieve the desired goal. The improved design of the connector is checked by field inspection of high frequency vibration to make sure the integrated general suspension rack can be hanged stably on the airborne and being flung out accurately by the modified design plan.
Research on Ship Swaying Motion Prediction Based on Multi-Variable Chaotic Time Series Analysis
Authors: Yang Xin Dong , Wang Zuo Chao , Shi Ai Guo , Liu Bo , Li Li
Published: June 2013

Wind and waves have particularly significant influence upon exertion of naval vessels battle effectiveness. It is urgently necessary to improve the ability of the Navy to carry out combat service in severe sea state normally. This paper aims to obtain the accurate prediction of ship motions with second level predictable time in real waves. According to the characteristics of the ship motion, the research on extremely short-time prediction of ship motion has been carried out based on multi-variable chaotic time series analysis, and the effectiveness of the prediction of ship motion in real wave is highly improved.
Research on Bandwidth of 1-3-2 Piezoelectric Composite with Multi-Mode
Authors: Zhou Jing Jing , Wang Li Kun , Qin Lei , Zhong Chao , Chen Cui Ying
Published: June 2013

This paper is concerned with the design of a new wideband 1-3-2 piezoelectric composite with multi-mode. The equivalent parameters of 1-3-2 piezoelectric composite with multi-mode are derived from series-parallel theory and uniform field theory. By using numerical calculation, the law of bandwidth varying with the cutting depth is obtained and compared with experiments. The computations show agreement with the experimental results. The results prove that the new wideband 1-3-2 piezoelectric composite with multi-mode can expand bandwidth efficiently, which can be expanded to 28.728 kHz that is 5 times the bandwidth of traditional 1-3-2 piezoelectric composite.
Thermal Error Analysis and Compensation Technology for High Precision Aspheric Measuring Platform
Authors: Yang Feng , Tang Qia Heng , Guo Yin Biao
Published: June 2013

In this paper, a thermal error analysis and compensation method for a high precision aspheric measuring platform driven by a linear motor system is presented. After analyzing the heat source of thermal deformation, the thermal deformation of guide is selected to be object, and the thermal analysis method of guide in heat balance state is proposed. According to the motor temperature at different positions, the thermal error curve of guide is obtained through simulation. Modeling the global positioning error of measuring platform and the compensation model of thermal error using polynomial fitting, the thermal error compensation experiments is implemented by applying compensation system of measuring platform's controller. The experimental results show that the maximum positioning error in heat balance state is reduced from 1.5μm to 0.7μm, which verify the validity of thermal error compensation model.
Blade Blending and Torsion Deformation Analysis Based on its Coordinate Measurement Data
Authors: Cheng Yun Yong , Zhu Zhen Zhen , Wang Li Ya , Yang Jie
Published: June 2013

Blade is one of the most important components of an aero engine; its geometric shape should be inspected carefully in the production stage to ensure that it satisfies the tolerance specification. Blending and torsion deformation are basic items of blade geometric shape inspection. Coordinate Measurement Machine (CMM) has been widely used to perform the blade geometric shape measurement. Some sampling strategies for blade CMM measurement are discussed and one kind of blade blending and torsion deformation calculation method considering the CMM probe radius compensation is presented. Experiments based on simulation data and real measurement data are performed to verify the adopted sampling strategy and deformation calculation method.
Three Calculation Methods for the Influence of Heat Loss by Infiltration
Authors: Lu Li Bing , Gao Meng , Li Dong
Published: June 2013

For multi-storey buildings,different calculation methods of cold air infiltration heat consumption have great impact on heating heat load of rooms in winter. With taking different methods,the calculation results will vary widely when architectual desigh institutes calculate room heat load. This paper compared the gap method,the ventilation rate method and the percentage method for the certain rooms infiltration heat loss,trying to make that simple and in line with the actual engineering calculation method.
Study on the Heat Transfer Performance of Two Kinds Material for Microstructure Heat Exchanger
Authors: Zhuang Jian , Wu Da Ming , Wang Wei , Zhang Ya Jun , Li Shi Bao , Hu Wei
Published: June 2013

In order to verify the possibility that polymer materials for micro heat exchanger could replace metal materials, polymer micro heat exchangers are regarded as the study object. In terms of the experiments and the simulations by Flo EFD software, temperatures, pressures and speeds on micro heat exchanger made by aluminum and conductive plastic Polyphenylene Sulfide (PPS) were carried out analysis respectively. The results showed that the cooling capacities of micro-heat exchangers made by these two materials are quite the same. According to cooling capacity, manufacturing cost and weight, the micro heat exchanger made by conductive plastic is entirely possible to replace the existing metal heat exchanger.
The Effect Analysis of Fin Arrangement on Thermal Hydraulic Performance of a Vehicular Cooler
Authors: Zhao Jing , Xiao Bao Lan , Wu Wei Ming , Yu Xiao Li , Lu Guo Dong
Published: June 2013

The excellent thermal hydraulic performances of coolers are the foundations of vehicular safety and stability. Structure, material, fin type and arrangement all have important effects on the thermal hydraulic performances. Numerical simulation method was adopted in this paper to investigate the effect of fin arrangement. The fluid flow and heat transfer performances were contrasted and analyzed under two different fin arrangements. It was found that fin arrangement effected thermal hydraulic performances severely and during the design process of a cooler, the performance requirements could be met through adjusting fin arrangements.
The Exergy Efficiency and Output Acoustic Power Performance Optimization of the Thermoacoustic Engine Micro-Cycle
Authors: Lin Jie , Wu Feng , Fei Jin Hua , Wang Tuo
Published: June 2013

The relationship between exergy efficiency and output acoustic power of the thermoacoustic engine microcycle model which only was accounted for the heat resistance had been analyzed using finite time thermodynamics.And through the new objective function,we obtain the optimization that not only obtain high exergy efficiency but also high output acoustic power at the same time.Optimized imperfection that we only pursue the high exergy efficiency, we obtain low output acoustic power and vice versa.We approve this conclusion by numerical calculation.The results that we obtained will be useful to optimal the design of a actual thermoacoustic engine.
Effects of External Window Form on Residential Building Energy Consumption
Authors: Chen Zhao , Bai Li , Li Feng
Published: June 2013

The author studies the factors on influencing energy consumption of three kinds of common forms of external window of the winter heating and summer cooling, according to the characteristics and influencing factors of living building external window of colding and heat load in severe cold areas, using the simulation software DeST-h to a certain residential building in Changchun City as an example. It analyses the effect of energy saving characteristics of different forms of windows and the influence on building energy consumption. It provides technical reference on rational design of the external window.
Numerical Simulation of the I-Beam during Cooling Process
Authors: Liu Jian , Hou Fu Zeng , Yu Xiao Guang
Published: June 2013

In order to improve the comprehensive mechanical properties of the steel, the heat treatment software COSMAP is used to simulate the rolling and controlled cooling of I-beam. The numerical simulation shows that: when the cooling rate is controlled at 10 °C/s around, the mechanical properties of controlled cooling can be obviously improved. The strength and hardness can be improved on the condition of ductility and toughness ensured, while the amount of residual austenite can be reduced significantly, which provide a theoretical basis for further optimization of the heat treatment process.
Experimental Investigation on Effect of Stack on Thermoacoustic Conversion System Performance
Authors: Wu Dan , Li Chao , Li Xiao Hua , Cai Yi Xi
Published: June 2013

The thermoacoustic conversion system is designed, while the position and structure parameter of stack are calculated and analysed. At the same time, the parameters of stack and the input working frequency which influence the system are researched by experiment. The results show that the center position of stack in the standing-wave tube and the length of stack have great influence on the system, and exists a best value in the same input power and frequency; Meanwhile, the pore diameter and wall thickness of stack are also exist the best values, the temperature difference at both ends of stack will be reduced if the value is too big or too small; The best working frequency of the system is migrated due to the stack, working fluid and so on.
Research of the Vibration Signal for the Bridge Structure Base on Stochastic Minus Method
Authors: Zhang Yan Hui , Lin Zeng Hua , Li Jian Qiang
Published: June 2013

With the Stochastic Minus method to get the vibration signal of bridge structure based on seismic excitation. Meanwhile, in order to verify the validity of the method, we make a computer simulation to a prestressed concrete continuous beam bridge. And we point out that the method is suitable to monitor the bridge structures based on environmental vibration.
Research on Compression and Reconstruction of Wind Turbine Vibration Signal Based on Discrete Cosine Transform
Authors: Huang Zhi Dong , Gan Xiao Ye
Published: June 2013

The method of compression and reconstruction for wind turbine vibration signal based on Discrete Cosine Transform is presented. Two group wind turbine vibration signals are compressed and reconstructed by DCT. The compression ratio and the compression reconstruction accuracy are investigated. The relationship between compression ratio, NSRMSE and the number of the reserved data is clarified. The result facilitates the application of compression and reconstruction for wind turbine vibration signal based on DCT.
Research on a Building under Multi-Dimensional Seismic Excitations
Authors: Sun Zuo Yu , Wang Hui , Mao Ke Yang , Fang Ming Sheng
Published: June 2013

For a building under multi-dimensional seismic excitations, a new random vibration analysis based on equivalent excitation method is presented, in which, a new equation of motion of the building is used to depict its dynamics and kinematics features. Since most of the earth shocks are non-stationary random processes, the input power spectral density of the seismic excitations are modulated by a time varying function, and their equivalent excitations are constructed by using continuous wavelet transform, where the continuous wavelet coefficients are calculated by using scales and the evolutionary power spectral density, while the equivalent excitations are constructed by inverse continuous wavelet transform. The random vibration analysis is carried out following the procedures of the equivalent excitation method. A simulation example is given to investigate some affection of the multi-dimensional seismic inputs, especially the rotational one.
Study on Acoustic Characteristics of Aircraft Targets' Propulsion System
Authors: Chen Yun , Wang Hua , Feng Shun Shan
Published: June 2013

For the short-range defensive weapons, extracting the acoustic characteristic of attacking aircraft at low altitude is an effective way to detect and recognize the target. The signal characteristics of radiated noise of the typical vehicle propulsion system are analyzed, and thus the signal models for propulsion system noise and for passive acoustic early-warning system are given. Finally, the analysis result of the measured aircraft noise validates the feasibility of the signal model.
Polythiophene-Coated Polystyrene Core-Shell Nanoparticles with a Rod-Shaped Polythiophene Shell
Authors: Li Hong Yu , Xiao Tian
Published: June 2013

A core-shell nanocomposite particle with polystyrene sphere core and polythiophene overlayer shell was synthesized through thiophene chemical oxidative polymerization using uniquely structured polystyrene latexes template. The morphology of polythiophene shell, which has nanorods shaped or featureless surface morphology, can be simply controlled through varying the dosage and feeding methods of oxidizers.
Research on Anti-Seismic Analysis the Overall Structure of Three-Ring Roller Coaster Based on Response Spectrum Method
Authors: Xu Ge Ning , Liu Peng Xiao , Yang Heng
Published: June 2013

In order to ensure the strength, stiffness and stability of the overall structure of three-ring roller coaster in the seism, the response spectrum method is used for anti-seismic analysis of the overall structure of three-ring roller coaster, the dynamic response under seism and anti-seismic characteristics is calculated, the safety of three-ring roller coaster under seism is verified, and practical method for anti-seismic analysis of roller coaster is explored.
The Contact Stress Analysis of Spiral Bevel Gear
Authors: Yang Hong Bin , Wang Hong Chang
Published: June 2013

In this paper I make use of the gridding function of ANSYS establish spiral bevel gear mesh model firstly.Then I transform the date of the meshing model and input then into the ANSYS. After assembly and structural expansion, I use the model to do the contact stress analysis of the spiral bevel gear.Through this,I obtain the distribution and changes of its contact stress.
Strength and Stiffness Optimization of Heavy-Duty Gear
Authors: Yang Li
Published: June 2013

In this paper, a kind of advanced gear body form is proposed, which has the structure characteristics of no weight reducing whole, thin spoke platesthick rim and large fillet. The optimization effect is confirmated by comparative analyzing the structure before and after optimization on strengthstiffnessweight and frequency adjustment performance of gear. The results show that the kind of optimization gear body is suitable for application in aviation, for which has the features of high strengthgood stiffness and light weight and which is easy to adjust gear frequency.
Optimization of Substituted Generating Lines of Cutting Hypoid Gears by Generating-Line Method
Authors: Yang Zhao Jun , Wang Yan Kun , Li Li Nan , Zhang Xue Cheng
Published: June 2013

In order to make the substituted circular arc generating lines be a series easily, based on the principles of cutting hypoid gears by generating-line method and the pinion generating lines substituting method, an optimization which the objective was to make the substituted circular arc generating lines radiuses of pinion be integers or approximate integers was proposed. The feasibility of this optimization method was verified by the calculating example of a pair of hypoid gears.
Research on Improvement of the Next Generation IEEE802.11ac Channel Model
Authors: Cai Hao , Han Dan Ao
Published: June 2013

Based on the special correlation of antennas and the power delay profile (PDP) of the cluster model, six models of A-F have been established by the TGn task-group in total. On the basis of the new broadband wireless local area network (WLAN) standard--IEEE 802.11ac with larger bandwidth and multi-user requirements drawn up by the TGac task-group, in this paper, the IEEE 802.11ac channel model is set up by means of improving and simulating the indoor MIMO channel.
Two Dimensional Photonic Filter with a Circular Resonant Cavity
Authors: Wu Zhao Xia , Shao Yuan Long , Li Wen Chao , Gu Er Dan
Published: June 2013

A new type of the two dimensional photonic filter which includes two in-line waveguides and a circular ring resonant cavity is presented in this paper. By using Finite Difference Time Domain (FDTD) method, we calculated and demonstrated the broadband frequency response of the filter and analyzed the impact of changing the dielectric constant of the inner rods on the transmission characteristics of the filter. Compared with the transmission characteristics of a micro-cavity,our numerical results show that such a filter can transmit multiple narrowband signals simultaneously. The number of the passbands of the filter increases with the rings of inner dielectric rods in the cavity. The center wavelength of the passbands can be tuned by adjusting the dielectric constant of the whole rods and inner rods without changing the size of the cavity..
Design and Implementation of a Digitally Tunable Tracking Preselected Filter for Ultra Short Wave Receiver
Authors: Chen Yong Tai , Su Li Juan , Sun Chang Jing , Ye Sen , Tang Jing
Published: June 2013

Design of a digitally tunable tracking preselected filter for improving anti-interference for Ultra Short Wave receiver front-end is proposed in this paper and the characteristics of the preselected filter circuit are analyzed. Then we mainly discuss an inductor-coupled dual resonant structure with better selectivity and anti-jamming and its implementation. Finally, test results are provided, shown the specifications of the circuit are in great agreement with the simulation and design requirements.
A Signal Generator Based on AD9850
Authors: Zhang Xian Yi , Xu Jian , Guo Xiang Quan , Lan Yan Ting , Tao Jia Yan
Published: June 2013

This paper analyzes the advantages of the direct digital frequency synthesis (DDS) in signal generator applications, introduces the basic principles and characteristics of AD9850, a cost-effective chip, shows the overall scheme of a signal source design based on DDS and implements the hardware system. Experimental results show the signal generator can produce sine wave signals scoping from 100Hz to 5MHz, clock signals and triangular wave signals and can display frequency on the LCD.
A Study on 400V Sized Trench Power Semiconductor for Smart Power ICs
Authors: Kang Ey Goo
Published: June 2013

Power MOSFET is develop in power savings, high efficiency, small size, high reliability, fast switching, low noise. Power MOSFET can be used high-speed switching transistors devices. Recently attention to the motor and the application of various technologies. Power MOSFET is devices the voltage-driven approach switching devices are design to handle on large power, power supplies, converters, motor controllers. In this paper, design the 400 V Planar type, and design the trench type for realization of low on-resistance. Trench Power MOSFET Vth : 3.25 V BV : 484 V Ron : 0.0395 Ohm has been optimized.
High Beam Quality and High Power Diode Laser Source
Authors: Gu Yuan Yuan , Wu Guo Xing , Lu Hui , Cui Yan
Published: June 2013

As the increasing applications of laser diodes in laser cladding and laser hardening, the single laser diode 0ptical power can not meet the actual requirements. An improvement of the power and Power densty necessary and it can be achieved by beam shaping and beam combination such as polarization coupling the polarization coupling technology is used to couple two laser beams with thin film plate polarizer In this paper two 880 nm vertical stacked arrays with an output power of l600 W was achieved After fast axils and slow axis collimated, the polarization direction of one stacked arrays is rotated 90 degree through a half wave plate, thus, the polarization directions of two laser stack are vertica1. The beams of two lasers are incident on the p1ate po1arizer, one transmits through it, and the other is reflected on it. Finally, two beams combine to one. Polarization coupling of two bars increases the power by a factor of 1.6, and the output power is 2500 W, electro optical conversion efficiency is more than 48%. The spot size is about2 mm x 2 mm. This laser can be directly applied to cladding, surface hardening and other fields.
Wave Shape Transformers Based on Transformation Medium Slabs
Authors: Ke You Gang , Yang Fu Gui , Qiao Liang
Published: June 2013

We propose wave shape transformers using slab transformation media which can transform planar wave shapes to convex or concave ones. By finite embedded coordinate transformations, a transformation is established from a parabola to a plane and the constitutive parameters of slabs are obtained. Numerical simulations are given to validate the performance of the theoretical design. Using such transformers, Gaussian beam collimation and focusing can be realized.