bluuebunny/crossref_metadata_2025 huggingface dataset:
Feedback Network Applied in Frequency Locking of Resonator Gyro
Authors: Jiao Xin Quan , Wang Xiao Li , Chen Jia Bin , Zheng Yong Qiu
Published: January 2015

Frequency locking of resonator gyro (R-FOG) is a key technology in gyro signal detection, the frequency locking stability determines the performance of the gyro. Based on transmission theory of ring resonator, this paper analyzes the resonant characteristics, builds the R-FOG system, realizes the output of resonance spectral line first harmonic by using sine wave phase modulation and demodulation technology. According to the source of circuit drift error in the traditional analogue proportion integral (PI), the T-type feedback network which can effectively inhibit the drift error was proposed and applied to the frequency locking of resonator gyro, which obtained better effect. By Allan variance analysis, the locking stability of resonant frequency for 4000s is better than 9×10-12.
The Application of Multi-Functional Portable Field Electric Check Terminal
Authors: Hou Ken An , Yang Li Xin , Fan Lin , Ding He Ping , Yu Dan
Published: January 2015

This thesis introduces some disadvantages of the electricity inspection tools at present, and proposes some new solutions and an electricity inspection tool in view of the above shortcomings and the insufficiency. The name of this electricity inspection tool is Multi-functional portable field electric check terminal. This electricity inspection terminal has many advantages and makes up for the insufficiency, solves some electricity inspection problems at present. The paper introduces in detail the hardware composition of Multi-functional portable field electric check terminal and working principle and working process.
Study of Secondary Electron Emission Depended on Surface Charge of Space Insulator Materials
Authors: Feng Na , Li De Tian , Yang Sheng Sheng , Chen Yi Feng , Tang Dao Tang , Zhao Chen Xuan
Published: January 2015

Secondary electron emission (SEE) processes play an essential role in spacecraft surface charging. It is difficult to study SEE of insulator whose surface cumulates charges by incident electron bombardment because of poor conductivity. This paper investigated the theoretical process of generation, transfer and escape of secondary electrons, and finally the paper presented a mathematical model to calculate the secondary electron emission. We also have improved measurement system to measure total SEE coefficient from dielectric with 1-5 keV electron irradiation which is perfectly fit to mathematical model, and the SEE coefficient with different surface charging is investigated. The results indicate the SEE coefficient decreases with positive charging and increase with negative charging of dielectric surface.
Simulation Study on Decoupling Control of Active and Reactive Power in Doubly Fed Induction Generator
Authors: Zhang Bao Luo
Published: January 2015

The decoupled control of active and reactive power in doubly fed induction generator (DFIG) is a key technology of wind power generation system. First, this paper introduces the principle of DFIG, then proposes an useful method for decoupling control of active and reactive power by analyzing the mathematical model of DFIG and the stator-flux-oriented vector control scheme. Finally, use the Matlab/Simulink tools for simulation studies, the results indicated that the decoupling control of active and reactive power in DFIG can be efficiently implemented, which can be considered as a reference control scheme for variable-speed constant-frequency (VSCF) wind power generation system.
Design of a New Digital Dual MCU Synchronoscope
Authors: Xu Gong De , Wu Zhi Liang
Published: January 2015

According to the requirements and characteristics of Marine Power Station quasi-synchronizing operation, a new high-precision digital synchronoscope is designed. Proteus and Keil are used as experimental platform. The corresponding software programming and peripheral hardware circuit design are completed. Moreover, the implementation and analysis of the main technical aspects are given. Simulation results show that the new digital synchronoscope fully achieve the functions that display and detection of frequency difference and phase difference between generator voltage and grid voltage. Besides, the operation is reliable, the detection is precise and the cost is low.
Research on FBG Temperature Sensing Network
Authors: Liu Kai Xian
Published: January 2015

Research of FBG temperature sensing network base on WDM combined with spatial division multiplexing. Theoretical analysis and numerical simulation proves that the scheme is feasible, and the system has relatively higher measuring accuracy, which realizes the temperature dynamic measurement in large space, forming temperature sensing network.
Research of Adaptive Control Bi-OADM in Passive Optical Network
Authors: Yang Kang , Zhang Mu , Yue Ying Juan
Published: January 2015

Architecture of adaptive control Bi-OADM is presented. Employing alternate-path switching scheme, the bi-directional traffic can be restored promptly under certain direction fiber failure in passive optical network (PON). The results indicate the adaptive control OADM exhibits a low loss (SMSR=15dB). As all the alternate-path switching is performed at optical switches, the administration and management cost can also be easily optimized.
Dispatching Technology Application in India Large Scale Blackout
Authors: Sui Jia Yin , Zhao Min , Zhou Wei Yue , Jin Peng
Published: January 2015

Scheduling technology plays an important role in avoiding the occurrence of large scope blackout. India "7.30", "7.31" blackout indicates dispatching mechanism is not reasonable. It is more important that it violates scheduling and supervision direction. The network defense mechanism is not perfect. It is lack of dynamic analysis and safety evaluation capacity. Dispatching technology can be a basis for China's high-voltage power grid construction, dispatching management and establishing a perfect accident recovery plan.
Performance Verification of MIMO Technology in WLAN System and Diversity Gain Issue
Authors: Zhu Yu Hao , Shen Chong
Published: January 2015

Wireless signal reflecting, scattering or refracting causes the generation of multipath effects. Multipath causes multiple copies of the same wireless signal, These copies to different path to reach the receiver. The signal generated by a copy of the same produce serious interference. MIMO (Multiple-Input Multiple-Output) technology can make the interference caused by the multipath significantly reduced. In this paper, in the context of indoor and outdoor, through TP-LINK-WR845N (MIMO 2*2, which have 2 launching antennas and 2 receiving antennas) to verify the superior performance of this technology under indoor condition, at the same time we discover that the MIMO technology does not increase the coverage under outdoor condition, because there is only the power gain, no diversity gain.
Study on Pre-Processing Method and Software Platform Development for Three-Dimensional Finite Element of Electric Transmission Lines Based on Solid Modeling
Authors: Liu Zhen Huan , Lu Yao , Xie Hui Chun , Zhang Jian Gong , Wan Hao , Chen Yu Long , Huang Rui
Published: January 2015

Through the implementation of algorithm based on B-Rep three-dimensional solid modeling techniques, combination with substation, pole tower, electric transmission line and other electric power facilities, C# is used as the main development language and Microsoft Visual Studio2013 is applied to develop three-dimensional solid modeling software of electric power facilities to serve as pre-processing part of CAE system and provide software technology support for finite element analysis.
Positioning Technology Research of Mobile Vehicle Group
Authors: Ge Shi , Piao Yan
Published: January 2015

In view of the contradiction between network cost and mobile vehicle group positioning performance, this paper proposes a algorithm based on virtual node anchor (has been positioned, not equipped with a positioning device for vehicles) and applies this algorithm to the Grid Scan algorithm, simulation results show that the improved algorithm is applicable to general positioning algorithm. compared with the original algorithm, positioning error of the improved algorithm is lower, localization rate is higher.
Design of Mechanical Structure & Control System of a Lower Limb Rehabilitative Robot
Authors: Shi Xiao Hua , Lu Yun Shan , Lu Hao , Wang Hong Bo
Published: January 2015

The rehabilitation robot which consists of two mechanical legs and an automatic seat was produced according to ergonomics. Each mechanical leg has three DOF. It can train patients combined with sEMG signal and FES. The rehabilitation robot has three train modes: passive mode, assistant mode and impedance mode, and it suits patients with different rehabilitation phases.
Design and Simulation of In-Wheel Driving System with Two-Speed Transmission
Authors: Shi Jia Dong , Song Kai
Published: January 2015

In order to improve the mobile robot’s climbing capacity and space usage, an in-wheel driving system is designed which uses micro electric clutches. The system structure, theory and design rules is analyzed, then the in-wheel driving system is designed. The in-wheel driving system is available by dynamics simulation of automatic two shift.
The Application of Emotional Design on Service Robots
Authors: Song Duan Shu , Huang Yue Xin , Cheng Shao Wei
Published: January 2015

This paper analyzed the emotional design, and Chinese children's education regulations were considered as the precondition. We tried to acquire the potential demands of the children, referring to the development of robot on a world scale. On the basis above, the authors designed the emotional design-oriented a children's education service robot. The design process offers recommendations and suggestions for the concept and practice of Chinese education service robotdesign.
Gas Control Technology in Heading Laneway Based on Gas Migration Character
Authors: Wang Shu Fang , Zheng Ye Ming , Zhang Jian Cheng
Published: January 2015

Gas disaster and prevention is the critical issue in heading laneways of underground coal mine. There are two goals needs to meet, one is air quantity requirement and energy conservation during normal ventilation, the other is safety and quickly during gas outburst. Firstly, gas migration character and auxiliary ventilation system placements are described in detail. Since two control goals need to reach, a dual-mode fuzzy control strategy for auxiliary ventilation is established. Besides weight calculation method which harmonizes subjective and objective weight calculation is put forward. After then, a gas discharging experiment platform including PLC controller, converter and heading laneway simulation model is established on the basis of theoretical analysis and simulation results. Finally, experimental results have shown that the system can safely and efficiently fulfill the function both at normal ventilation and gas discharging.
Study of Building Automation Systems Engineering
Authors: Lv Rong Sheng , Yang Rui
Published: January 2015

BA System (Building Automation System) is an important intelligentized subsystem of Intelligent Building, also known as the groundwork of intelligent integration. It is the integration of multi-subsystems, which aims at automatic device management, efficiently saves energy and reduces use-cost. What is outstanding out of all effort for saving energy in modere Intelligent Building are both supervision and control of air-conditioner system. Now BA System comprises the basic components, here they are: central station, sub-station, spot meters, Control Network.According to survey, there are few stable BA System for long, without regard to amount of those existence. It results directly in massive equipments and related investment suspended. The thing is gone for little. The thesis illuminates functions and components of BA System thoroughly, gives further details of key technique---Control Network and System Integration, and predicts trend of this system. Based on the analysis mentioned along whith my experence, the procedure, principles and key point of BA System design and device choice are given; further more, embodies methods through illustrating real project for better utilization of BA System. In the end a conclusion and forecast of BA System are put forward.
Backward Path Tracking of Mobile Robot with Two Trailers
Authors: Ma Yu , Zhang Yong , Cheng Jin , Zhao Qin Jun
Published: January 2015

With the social development and the continuous progress of science and technology, the mobile robots can greatly improve efficiency, reduce costs, many of these applications can be attributed to the backward path tracking control problem. A controller for backward path tracking of mobile robot with two trailers is addressed in this paper. The paper presents a new approach to stabilizing the system in backward motion by controlling the orientation angles of the two trailers. Nonlinear smooth control laws for orientations of the trailers with asymptotic stability in backward motion are then proposed. The result simulated in Simulink illustrates the effectiveness of the control law and the controller.
The Analysis on Manufacture Cost of Fire Robot Based on Modular Design
Authors: Fang Shu , Xu Yan , Dong Fei
Published: January 2015

The manufacture of fire robot has characteristics such as different types and piece production, and flexible manufacture and cost control of the fire robot must be considered due to these characteristics. In this paper, the similarity of fire robot’s working environment was analyzed, The demand of chassis’s adaptability and the method using general technical platform were discussed with the thinking of modular design, and new series fire robots which composed of the general platform and different function modules were proposed, and the manufacture cost of traditional design method and modular design method were compared in using the activity-based costing method, and under the new design method the manufacture cost were decreased extremely.
Control System Designed for a Four Rotors Unmanned Aerial Vehicle
Authors: He Wei Ming , He Guo Jing , Zhang Jian Qi
Published: January 2015

In order to achieve the autonomous flight control of the quadrotor, an autonomous flight control hardware platform was set up, with a self-assembly aircraft as the body frame. The control system was designed according to the principle of quadrotor. It includes the hardware and code. A flight control model for the four rotor aircraft was established, so as to analyze and optimize the performance. Flight test was down. And the results showed that the quadrotor was able to flight stably and be well controlled.
The Analysis on Suspension of Fire Robot Based on FEA
Authors: Xu Yan , Fang Shu , Fu Jian Qiao
Published: January 2015

The suspension of fire robot, one of necessary components, directly impacts the environmental adaptability, and the strength of suspension has great importance to the life of robot. In the paper, the structure and the stress condition of the suspension was analyzed. The force condition of suspension is simplified as a 2-D diagram, the load acting on the elbow were simplified in two direction, A finite element model, which simulated the impact load and optimized the design of suspension, was established, and the result of the simulation shows the suspension structure is reasonable and the strength of the component is enough.
Research on TSC Type Reactive Power Compensation Control System for Coal Mine Based on STM32
Authors: Yang Pan Pan , Dong Chen Lu , Wang Yang
Published: January 2015

As the increasing equipment of high power and motor load put into coal mine enterprise, the quality of power supply is decreasing, such as low power factor and large voltage fluctuation, etc. After analyzing the theory and algorithm of reactive power compensation in details, studying a system based on STM32 thyristor switched capacitor (TSC) reactive power compensation control system, which includes compensation, control algorithms of nine zone diagram, controller hardware design and software design. The experimental results show that, this TSC system can realize a faster and more accurate measurement and switching, which have an obvious effect of compensation, and a safe and efficient automatic operation of the system.
The Simulation and Analyses of Timing-Optimal Trajectory Planning for 6DOF Robot
Authors: Gou Zhi Jian
Published: January 2015

The algorithm has been improved to the adaptive genetic operators and flow based on the basic theory of simple genetic algorithm and adopted elitism strategy to select the best individual for iterative operation. The improved genetic algorithm not only ensured better global search performance, but also improved the convergent speed. The optimal solution was obtained and simulated by the improved genetic algorithms under the kinematical constraints.
Synchronization Controller Design for Chaotic System with Input Sampled-Data Missing
Authors: Ren Tao , Zhang Qiang , Tang Meng Qian , Yang Yan Fei
Published: January 2015

For the chaotic systems with sampled data input, the discontinuous nonlinear system is transformed into a discrete system, and the switched system is proposed considering the control inputs missing. By using the zero input method, a sufficient condition is derived for the exponential stability of the error system. Simulation results illustrate the effectiveness of the proposed sampled-data control method.
Dual Closed-Loop Electric Power Steering System on the Mixed H2/H∞ Control Strategy
Authors: Wei Wan Ying , Chen Jin Ying , Li Hong Lian
Published: January 2015

Aiming at the request of EPS system for the robust stability and the dynamic characteristic, the dynamics model of an electric power steering system (EPS) is established , the outer ring mixed H2/H∞ control based on genetic algorithm decides the values of the target torque and solves the perturbation problem, the inner ring control with PID control algorithm will never compromise with current real-time control. Simulation results show that the application of mixed H2/H∞ in the outer ring for current decision can make the EPS system stable and realize the ideal control performance, can also obtain the low frequency information from the surface of the road and depress the high frequency interference.With the application of current tracking loop PID control, EPS system has good dynamic characteristics of the target current real-time tracking, so that electric power steering system has better stability and traking performence.
Design of the Intelligent Control System Integration of Wastewater Treatment
Authors: Chen Wen Hua , Cai Qiang , Wang Xu
Published: January 2015

In order to achieve the integrated process of wastewater treatment, this research designs a kind of intelligent control system that can monitoring water quality parameters in real-time, which is small, convenient control, high efficiency and low consumption. The acquisition station and control station of the system are based on STM32F107 and industrial control tablet, combined with IASBR process to achieve simultaneous removal of organic matter, nitrogen, phosphorus and COD in wastewater. This system can monitor water temperature, pH, ORP, DO and other water quality parameters. Aiming at the uncertainty of the DO in process control, the fuzzy control method is proposed to realize the rationalization of aeration, meet the needs of wastewater biochemical treatment of the DO. It has a certain reference value to the intelligent development of integrated wastewater treatment.
Performance Study of Coal Water Slurry
Authors: Gai Ke , Qi Hui Li , Ma Dong Ping , Liang Wen Li
Published: January 2015

This paper is based on the research of the coal water slurry rheological property and stability. The influence of the concentration, additives and temperature on the rheological properties of the slurry has also been studied. The apparent viscosity increases with increasing concentration of coal water slurry, and decreases with increasing temperature. An introduction of additives can greatly improve the rheological properties of coal water slurry. The stability of coal water slurry increases with the increase of concentration, and the stability decreases with the increase of temperature. A proper amount of additives can improve its stability.
Fuzzy Fractional Order Proportional Integral Controllers for UAV Lateral Attitude Control System
Authors: Liu Yi Duo , Wang Chun Yang , Li Ming Qiu , Tian Cheng Jun , Bai Duan Yuan
Published: January 2015

This article is based on the theory of fractional calculus control, and put forward a kind of fractional order PI controller design method for lateral attitude control system of unmanned aerial vehicle (UAV) model. And the unit step response of the control system is analyzed in the simulation to improve the UAV flight control system stability and robustness. Use the controller parameter tuning method and combined with fuzzy reasoning to design IOPID controller, FOPI controller and fuzzy fractional order PI controller. Then, by exploiting Matlab, the frequency domain response and unit step response characteristics of the different control systems can be plotted. The results verified that the designed fuzzy fractional order controller for the attitude control system is effective.
Robust Fractional Order Proportional Integral Control for Large Time-Delay System
Authors: Xin Rui Hao , Wang Chun Yang , Liu Xue Lian , Li Ming Qiu , Bai Duan Yuan
Published: January 2015

In this paper, a new control method for large time delay system is proposed. Firstly, the decreasing time delay controller is used to remodel large delay time plant into small delay time plant. Then, a fractional robust proportional-integral controller (FOPI) is designed, using the phase margin and cut-off frequency at a specified point in the Bode plot of flat robust conditions, to guarantee the desired control performance and the robustness of the high order system to the gain order system. For comparison between the fractional order proportional integral controller and the traditional integer order PID (IOPID) controller, the IOPID controller is also designed following the same proposed tuning specifications. The simulation results indicates that the both designed controllers work efficiently. Furthermore, the FOPI controller makes the large time-delay system get better control effect, the system has high robustness, adaptive ability and anti-jamming ability.
Robust Gain-Scheduling Controller for Airbreathing Hypersonic Flight Vehicle
Authors: Shen Yuan Chuan , Yu Jian Qiao , Luo Guan Chen , Yang Rui Guang
Published: January 2015

This paper addresses issues related to robust control for an airbreathing hypersonic flight vehicle. Owing to aero-propulsion couplings caused by the unique structure shape, the model of the vehicle is greatly nonlinear and complex, which presents an enormous technical challenge for control. The nonlinear model is transformed into a linear fractional transformation (LFT) model, and a robust gain-scheduling controller based on linear parameter-varying control (LPV) with full block multipliers is obtained. Simulations illustrate great improvements of the dynamic performance in closed-loop system.
Mechanical Cutting Process of Cutting Robot Based on CAD/CAM Integrated System
Authors: Xu Jiu Nan , Hu Zhi Xin , Weng Ling Xiao
Published: January 2015

Control problem of mechanical cutting is a development bottleneck of processing technology of robot. As compared to the simple mechanical process, the control process of automatic processing trajectory for cutting robot is relatively complex. This paper uses the CAD/CAM integrated control system to control the robot cutting process, which realizes the integration design of robot machining process. The extraction of G code is through the VC program, and then it uses MATLAB to do data analysis, which completes the design of process parameter for cutting path. Finally we use ADAMS simulation to forecaster the process parameters and machining process, through the analysis of the data it improves the machining accuracy. And it provides a theoretical reference for the research on mechanical automation process.
Electronic Structures and Theoretical Electronic Spcetra of Meso-Phenyl and 3,5-diaryl Substituted BODIPY Dyes
Authors: Gou Gao Zhang , Shi Ling , Zhou Bo , Chen Xian Lan , Liu Wei , Mang Chao Yong
Published: January 2015

The electronic absorption spectra of four meso-phenyl and 3,5-diaryl substituted BODIPY dyes, A to D, were investigated theoretically using the time-dependent density functional theory (TD-DFT) B3LYP method. The dependence of spectra with the molecular and electronic structures was investigated on the basis 6-31+G*, 6-31G and 6-31G* in different solvents. The UV-Vis spectra were in good accordance with the experimental values. The maximum wavelengths of BODIPYs arose from S0→S1 transition which stemmed from HOMO to LUMO (πbodipy core→πbodipy core*).
Study on Application of Expert Systems in PID Thermostatic Control
Authors: Yang Xue Kun
Published: January 2015

Environmental parameter control is a common case in the technique of computer measurement and control, which has been widely applied to the practice of industrial and agricultural production. PID refers to one of the algorithms commonly used in temperature control, while the setting of PID parameters is the key to the algorithm. As one of the most successful branches in artificial intelligence technology application, expert system can simulate the thinking process of human experts by making use of the experience and expertise accumulated by experts for years, so as to resolve difficult problems that can only be settled by experts. An application scheme of expert system to PID thermostatic control is proposed by this paper for the purpose of making thermostatic control more convenient and intelligent.
Grain Refinement Strengthening of Sm in AZ61 Alloy
Authors: Zhang Qing , Li Quan An , Chen Jun , Zhang Xing Yuan
Published: January 2015

The grain refinement and relative strengthening of rare earth element Sm in magnesium alloy AZ61 has been investigated. The results show that high melting point Al2Sm phase forms in AZ61 alloy with the addition of 2wt.% Sm. It leads to the refinement of grain size and enhances the strength of AZ61 alloy.
Research on Curing Processes in RTM by FEM
Authors: Yu Yan Jun
Published: January 2015

The research on curing processes in Resin Transfer Molding is helpful to control the chemical reaction, material structures and properties.In this paper, the chemical kinetic equations of curing processes, crosslinked structure parameters equations and the temperature basic equations are founded in the curing processes. The finite element method is adopted to simulate the curing processes to analyze the influence and changes of temperature, curing ratio and crosslinking degree.
Study on the Cutting Process for Remanufacture Deposited Materials
Authors: Wu Zhi Yuan , Zhang Kang , Tang Xiu Jian , Tian Xin Li , Wang S.H.
Published: January 2015

. The systematic experiments for cutting remanufacture deposited materials have been finished. The results show that the deposited materials can be divided into two parts on the view of machining process:surface layer and dense layer. One of the distinctive features on surface layer is impacts to cutting tools in the process. And the process of dense layer cutting is similar with homogeneous material. On the basis of above, the paper puts forward the method which adopts different processing phases for deposited materials.
Study on Flow Characteristics inside a Spillway Tunnel of Hydropower Station
Authors: Zhang Hong Qing , Cao Bing , Lou Yi Long , Tan Wei Kai
Published: January 2015

VOF model and turbulent model were used in this paper to study on flow characteristic inside a certain spillway tunnel of hydropower station, which includes cross sectional distributions of flow velocity in pressure section and non-pressure section. The results show that flow velocity distribution in the pressure section of the spillway tunnel is basically symmetrical. After turning, flow velocity is well-distributed and move ahead; flow velocity in the right side of non-pressure section in the spillway tunnel is 1m/s faster than that in the left side. When two high-speed water flow come together after passing through the central division pier, flow velocity distributions in the both sides of the spillway tunnel are all uniform. The conclusions obtained can improve the design of the spillway tunnel.
Research on Optimum Design of Underground Diaphragm Wall with Interior Bracing
Authors: Sui Xiu Zhi , Liu Xun Chen
Published: January 2015

The impacts that steric effect of underground diaphragm wall on mechanical characteristics of building envelopes was considered under the interaction between the support and the wall. With the introduction of correlative coefficients C1 and C2, based on the theory of beams on elastic foundation, actual underground diaphragm wall design internal force and the displacement formula is proposed. Through calculate the internal force and displacement under different working conditions, verified the correctness of the formula.
Experiment Study on Concrete Resistance to Chloride Ion Penetration
Authors: Li Wei Hong , Xu Ying Ying , Wang Yi Han
Published: January 2015

The influence law of permeability of chloride ion in concrete of load level, curing condition under the sustained pressure load and the corrosion environment interaction is researched in this article, which is through natural diffusion method. Experimental results show that as the load level increases, there is a tendency of the chloride ion content after the first increase and then decrease, the turning point in the middle remains to be further studied. Good conservation condition reduces large holes and harmful holes in concrete block, thereby reduce the porosity and improve resistance to chloride ion erosion.
Dyeing Process of PSA/MPIA Blended Fiber
Authors: Ling Cui Shu
Published: January 2015

The dyeing process of Polysulfonamide (PSA)/poly-m-phenylene isophthalamide (MPIA) blended yarn is studied. By choosing suitable dyeing carrier and dyeing parameters, the optimum dyeing condition was determined as follows: cationic dye 2-3%(o.w.f.), carrier acetophenone 40g/L, sodium chloride 15g/L, pH value 4-5, dyeing at 140°C for 60 minutes and the liquor ratio 30:1.
Coated Thermal Resistance/Heat Reflection Pavement Construction Technology
Authors: Sun Jie , Liu Feng , Feng Li Chao , Xie Ning
Published: January 2015

The high temperature of asphalt concrete pavement decreases its bearing capacity, thus leading to serious rutting. In this paper, a coated thermal resistance/heat reflection pavement construction technology with a coating of 2-3mm on the asphalt pavement is mainly introduced, which can reflect and prevent sunshine and reduce the surface temperature of asphalt pavement for the purpose of preventing rutting. In addition, the coated thermal resistance/heat reflection paving method is introduced, which is of certain reference to the promotion and application of coated thermal resistance/heat reflection pavement.
Experimental Study of Bellows Duct Grouting Compactness with Quantitative Detection
Authors: Chu Feng , Cao Yuan , Qi Guang Zhi , Gao Lei
Published: January 2015

In order to quantitatively detect the compactness of bellows duct grouting, by studying time-histories relation curve forming by ultrasonic wave transmitting in different thicknesses concrete samples. We get the acoustic time rule after ultrasonic passed through different compactness bellows duct. At the same time, establishing empty hole estimation model corresponding to the concrete samples and providing theoretical basis for judging porosity and predicting the grouting quality in the bellows duct. Meanwhile, dividing the bellows duct into five degrees complete compactness, 3/4 compactness, 1/2 compactness, 1/4 compactness, empty by setting up defects in the bellows duct, and then embedding them in concrete slab to do ultrasonic detection. The detection result shows that ultrasonic detection method can effectively quantitive estimate the grouting quality of prestressed bellows duct with establishing empty hole estimation model.
Typical Portal Structure for Single Track High Speed Railway Tunnel in Rugged Mountainous Area with High and Abrupt Slope
Authors: Zhou Xiao Jun , Jiang Bo , Zhou Yue Feng , Yu Yu
Published: January 2015

On the basis of different landform and multifarious topography in rugged mountainous area in southwest China, typical tunnel portals for single track tunnels in a new high speed railway line have been presented in the paper. The portal comprises headwall, shed tunnel, bridge abutment and its support. Portal with headwall is suitable for tunnel to resist front earth pressure on high and abrupt slope. Shed tunnel is placed in front of headwall so as to prevent rockfall; its outward part is built into a flared one. Meanwhile, the installation of bridge and its abutment are also included in the portal according to landform in the paper.
Influence of Waterproof Wall in Approach Channel of Double-Line Ship Lock on Flow Condition
Authors: Li Jun Tao , Peng Wei
Published: January 2015

Unsteady flow during lock filling and emptying in approach channel of double-line ship lock is more complicated than that of single line ship lock. In this paper, by a 3-D numerical model, the water fluctuation inside approach channel under different arrangement types of waterproof wall and the hydraulic characteristics such as longitudinal flow velocity and transverse flow velocity were analyzed on the basis of the 2000t second-line ship lock construction project of Zhuzhou navigation power junction in Xiangjiang River. According to the separate arrangement scheme and the completely-connected arrangement scheme of approach channel, the flow condition problem may exist in the scheme was analyzed. In order to improve the ship navigation and berthing condition, it was proposed that the waterproof wall should be set between the approach channels of the second-line ship lock.
A Novel Compound Machining of AISI 321 Stainless Steel Using Small Diameter Electrodes
Authors: Shen Yang , Liu Yong Hong , Dong Hang , Ji Ren Jie
Published: January 2015

Experiments of high-efficiently compound machining (CM) combined by EDM and arc machining of AISI 321 stainless steel at 658mm3/min material removal rate (MRR) using solid electrodes of different materials and different diameters of less than 5mm were conducted. The CM process parameters, including electrode rotation speed, peak current, electrode materials and electrode diameter, were studied to evaluate the effect on MRR, relative electrode wear rate (REWR) and width of overcut (WOC). The re-solidified layer of 321 for CM was also investigated. Faster electrode rotation speed, higher peak current, larger electrode diameter and pure tungsten electrode material are essential to achieve lower REWR and higher MRR. The processing conditions were bad using electrode diameter of 2mm. The re-solidified materials are significantly more densely than base materials.
Shear Isolation Design under Reinforced Blockade
Authors: Wang Shui Jiang
Published: January 2015

In the process of architectural design, sectional shape is used instead of original shape. Shear isolation design combined with reinforced blockade, make up for the lack of original wall bearing capacity, stiffness and ductility, energy, lack of hysteresis characteristics. In order to determine the effectiveness of shear isolation design under reinforced blockade. Building shear cracking damage experiment is performed. The results show that cross-sectional shape and reinforced shear wall buildings blockade isolation performance was significantly better than the original shape of the shear wall design, reinforced blockade is significantly enhanced, strength and ductility effect are dramatically improved.
Review of the Research Progress of Rock Burst
Authors: Zhang Yan Bo , Yu Guang Yuan , Tian Bao Zhu , Liu Xiang Xin
Published: January 2015

Rock burst is one of geological hazards encountered frequently, rock burst research has important significance for safety production in mine. The paper based on different definitions of rock burst, the produce conditions and manifestation of rock burst are summarized, and classified. The mechanism and prediction of rock burst in the mainstream view the advantage and disadvantages on comparison, a novel thought is given for rock burst mechanism. Suggest t to continue research on the mechanism of rock burst, and multi field coupling method to predict rock burst.
Analysis of Causes of Deformation Modulus Mismatches Degree of Columnar Jointed Basalt Blocks
Authors: Wei Yu Feng , Xun Xiao Hui , Nei De Xin
Published: January 2015

Columnar jointed basalt rock block is small, but has a longitudinal wave velocity, high modulus characteristics. This article is based on the structure of surface measurements, acoustic testing, and field distortion tests results, from the liquid structure, structural plane development situation, etc., analyses the causes of this phenomenon.
Analysis of Construction Project Basing on Concrete Durability
Authors: Sun Kai Ke , Zheng Yan , Li Ming Fei , Yang Zhao Peng , Guo Shuai
Published: January 2015

In response to this phenomenon that many construction projects failed much earlier than their expected service life ,or failed to accomplish their expected functions caused by the reinforeed conerete structure are found to be suffering from deterioratioon of structural performance and degradation of safety,due to the deficiency of concrete durability. From the perspective of what effect of economic that has been taken by the concrete durability,so the method what would been used to analyze economic of construction project was proposed ,and the objective function of economic analysis of construction project was created based on the concrete durability,all of the above work will lay a solid foundation to study the reliability design of construction project and economic analysis.
Application and Construction Suggestions of Unbonded Prestressed for the Large Structure of Oxidation Ditch
Authors: Wang Tan , Dou Li Jun , Yin Kun
Published: January 2015

The paper introduced that application of unbonded prestressed for the large structure of oxidation ditch,the application can improved the integrity of the structures of the pool wall.Emphasized that it should be pay attention to the construction process control when construct. Ensure that the effect of the prestressed.
Simulation and Empirical Analysis on Real Estate Prediction Based on Friction Model
Authors: Yang Yi , Li Shan
Published: January 2015

Based on the housing holding cost model, this paper obtains the causes of real estate price expectations, and analyzes the four factors which affects real estate price expectations from the theory: the supply side, demand side, the local government and some main monetary policy variables. Combined with the actual situation in Chinese real estate market this paper puts forward the corresponding hypothesis. The empirical results show that the main source of housing prices driving force is the demand side, while the impact of local government on prices is not obvious; the effect of supply side and monetary policy on house prices is relatively small. The nominal interest rate has no significant effect on prices, and the real interest rate has more obvious effect. Based on the empirical conclusions, this paper puts forward the corresponding policy suggestion of houses prices expectation management.
On Sustained Development of Green Building Materials
Authors: Wang An , Chu Rong Fei
Published: January 2015

Environment problems have attracted common concern and have great impact on the construction industry, so we must emphasize the use of green building materials. The paper discusses the meaning, the necessity and the development strategy of green building materials.
Simulation Analysis of Baochuan Reinforced Concrete Beam-Supported Aqueduct
Authors: Ji Dong Yu
Published: January 2015

This paper adopts finite element method to carry out three-dimensional finite element simulation analysis for Baochuan reinforced concrete rectangular section beam-supported aqueduct. Researching variation law of the aqueduct’s stress and displacement in construction process and operating process. Analysis results show that, structure of Baochuan reinforced concrete rectangular section beam-supported aqueduct is reasonable, it meets the requirements for engineering.
Research on the Board of Supervisors Effect of Building Materials in SMEs
Authors: Gao Ming Shi , Wu Yong , Zhao Chen
Published: January 2015

This paper made an empirical analysis on the board of supervisors system implementation effect of building materials in SMEs . The author discovered that there was no obvious linear relation between board of supervisors characteristic and the connected sale;The board of supervisors scale and the stock supervisor proportion had no remarkable influence to the connected scales; But the board of supervisors conference number every year had remarkable positive correlation with the connected procurement. The real diagnosis results had reflected that our board of supervisors was invalid to some extent in China.
Research on Test of Sunlight Greenhouse Illumination Environment
Authors: Yang Wen Xiong , Wang Xiao Zhi
Published: January 2015

This paper uses total radiation instrument and scattered radiation instruments to test illumination irradiance in the center point of sunshine greenhouse, and compares the test data with the software model predicted data, the results show that: the radiation of fine day indoor sunshine greenhouse is generally larger than that in cloudy. The average values in fine day of outdoor observation value, outdoor simulation value, indoor observation value, indoor simulation value are 347.6, 292.3, 153.8 and 151.7, while that in cloudy day are 261.1, 262.7, 110.2and 123.9. The trend of total indoor radiation simulation value is consistent with the observation value.
Study on Environmental Protection Decorative Building Formwork Material and its Production Method
Authors: Li Ya
Published: January 2015

To advocate and promote environmental protection building decoration materials is the inevitable trend of the development of the times is the requirement of sustainable development, also is the construction of environmental protection, healthy living security. We introduced the environmental protection building decoration material advantages, classification and the current flow of Ding green building and decoration materials, and the environmental protection building material prospects into Ding exploratory prospects.
Effect of Cr Addition on Microstructure and Mechanical Property of Cu-17Ni-3Al-1.2Fe Alloy
Authors: Wu Wei , Zhao Chao , Weng Yuan Hui , Luo Zong Qiang , Zhang Wei Wen
Published: January 2015

Effect of Cr addition on microstructure and mechanical property of Cu-17Ni-3Al-1.2Fe alloy were investigated by means of tensile testing, optical microscope (OM), scanning electronic microscope (SEM) and transmission electronic microscope (TEM). The results showed that the morphology and type of second phases which exist among dendrites change significantly with the addition of 0.85 wt % Cr. A lot of rod-like and multi-branched Cr-rich phases can be observed while the formation of Ni3Al is suppressed. However, Cr addition does not change the type of particle-like Ni3Al which evenly distributes in the matrix. With the addition of Cr in Cu-17Ni-3Al-1.2Fe alloy, the tensile strength, yield strength and Brinell hardness increase, especially the yield strength with the increase of 31%, however, the elongation decreases slightly.
Interior Design Function of Computer-Aided Systems
Authors: Li Si Hui
Published: January 2015

China Academy of Building Research developed CASD software is a set of current Chinese interior decoration works more advanced computer-aided systems. The charge in the development of software design process has been integrated with the design, the overall process architecture is very reasonable, with a clear overall advantage. Various functional modules specific division CASD system also worked closely, and also give full consideration to the reality of decorative construction collision problems. The built-in modeling means rich and practical introduction "decorative base," an important technical means to grasp the construction more convenient interface. All this fully shows that a system design is quite intelligent, humane, is a computer-aided system is ideal for interior design, it is worth promoting the use of interior design.
Application of ANOVA into the Evaluation of Homogeneity of Materials
Authors: Ning Ri Bo , Li Qian , Xu Song Ning
Published: January 2015

The concept of homogeneity of materials and the aim for the evaluation of homogeneity were introduced. It was discussed in detail for the application of one-way ANOVA into the evaluation of homogeneity of materials and the role which a statistical quantity plays in the different range. It can be illustrated that a small F value is necessarily not considered as a criterion of qualified homogeneity. It was also pointed out that the inhomogeneity with sample may cause a small F value. Based on the theoretical explanation, an equation was given for the threshold value of small F. A calculation of the threshold value of small F occurring in the common experiments was made using the routines of numerical integration. An investigation into the origin of small F value was carried out. Moreover, the regional inhomogeneity and its criteria were also shown.
Analysis on Static Characteristics of Flipping Horizontal Machining Center
Authors: Shao Rui , Yu Ding Wen , Feng Ping Fa , Jia Hui Shu
Published: January 2015

The worktable and the mainframe of the flipping horizontal machining center can be separated. The performance of the mainframe largely determines the machining performance of the whole machine. The deformation of mainframe under the application of certain forces demonstrates its static characteristics, which helps to find the vulnerable points for improvements. This paper mainly discusses the modeling of ball screw interfaces by taking into account the interface modeling. Static analysis is made by using Workbench to provide guidance for structural improvements.This electronic document is a “live” template and already defines the components of your paper [title, text, heads, etc.] in its style sheet.
Numerical Simulation on Finned Heat Pipe under the Condition of Convection
Authors: Zhong Xiao Hui , Xue Ting Ting , Liu Chao
Published: January 2015

This paper intends to use Gambit software to set up different mathematical models for the finned heat pipe, separately from the perspectives of three-dimensional, steady-state, natural and mixed convection. And then, it also uses Fluent software to do numerical simulation on the influence of different fin spacing, fin height and fin angle under the conditions of natural convection and different horizontal wind speed on heat transfer performance of fin under the conditions of mixed convection. The results show that, under the condition of natural convection, increasing the fin spacing, fin height and fin angle with the horizontal angle can improve the heat transfer performance of finned heat pipe; Under the condition of mixed convection, with the increase of horizontal wind speed, on which the horizontal wind speed has a greater influence, the heat transfer rate and heat transfer coefficient of fin present approximately linear increase.
Strength Analysis of Aircraft Accessory Gearbox Shell
Authors: Shi Yan Yan , Du Ning , Yang Rong , Zhang Mao Qiang , Sun Hong
Published: January 2015

We get the load and the work stress of aircraft accessory gearbox shell based on every starting and flying conditions of plane. By analyzing the stress level and stress distribution of the shell ,we assessed the shell structure validity and then proposed improving method .The study shows , the strength of the bearing mounting holes and its supporting stiffeners of the shell is lower than else structure part, and the starting condition is strength weak condition of the shell, so the study results supplies a theory reference to the design and improve method of aircraft accessory gearbox shell structure.