bluuebunny/crossref_metadata_2025 huggingface dataset:
New Method for Construction Land Prediction Incorporating Genetic Algorithm and Support Vector Machines
Authors: Luo Yi Yong , Zhang Li Ting , Zhang Hao
Published: November 2011

Considering the increasingly tense relationship between construction land supply and demand, we study the inherent rules and the spatial evolution in construction land use. In order to solve the problem of parameter optimization effectively, we analysis the fundamental theory of Support Vector Machine and finally accomplish the combination of genetic algorithm and support vector machine. Meanwhile we apply this model to analysis the construction land use and propose a new model, which is based on the support vector machines with genetic algorithm, for construction land evolution. Taking Guandu district in Kunming, Yunnan as a case, we find out that the new model is far superior to recent models in terms of predicting accuracy, algorithm complexity and computational efficiency. And therefore, we believe that this is highly precise, practical and efficient model for forecasting construction land use and evolution.
Study on Sliding Mode Control with Gray Theory for Electro-Hydraulic Servo System
Authors: Zhang Qi , Hou Li , Tang Yan , Liu Song
Published: November 2011

Uncertainties in the servo system may cause the deterioration of the control quality of the electro-hydraulic servo system, and even lead to its instability. To solve this problem , this paper proposes a sliding model control (SMC) strategy with gray prediction and compensation by making use of gray prediction to identify and compensate parameter perturbation and external disturbance. Given the quality and stability of servo system will be effected by the chartering phenomenon in the SMC, this paper proposes an approach to overcome the chattering a mixed reaching law approach. The proposed control strategy improves anti-disturbance, anti-parameters perturbation capability and reduces the chattering problem. Simulation and experiment indicated that: external disturbance and parameter perturbation of the servo system can be effectively predicted and compensated by the proposed control strategy, and the problem of chattering was also inhibited obviously; the anti-interference and anti-parameters perturbation ability, stability and control quality of the system were improved.
Research on Powertrain System of Series HEB Control Strategy Simulation
Authors: Si Chuan Sheng
Published: November 2011

Based on the development status of hybrid electric vehicle(HEV) at home and abroad, combining the features of urban traffic and urban bus operation, the control strategy of hybrid buses powertrain is analyzed and researched. The whole performance of series hybrid electric bus(HEB) control scheme is simulated and analyzed using HEV simulation software ADVISOR. The result shows that the control strategy plays a positive role to improve automobile fuel economy.
Energy Storage and Deposition Characteristics of Spark Ignition System
Authors: Wang Dao Jing , Zhang Hong Guang , Sun Xiao Na , Wang Dao Jing
Published: November 2011

Time-resolved current and voltage measurements for an inductive automotive spark system were made. The measurements were made in air for a range of charge time from 1-8ms, at ambient temperatures. Primary current was measured, so the primary energy can be calculated. Current and voltage signal of secondary circuit was detected, from which the spark energy and energy transformation efficiency can be calculated. Test results show that: when the charge time is 6ms, both the primary energy and spark energy reaches to saturation value, does not advanced any more with the charge time increasing; and the energy transformation efficiency is at an appropriate range.
System Based on BP Network for Garment Quality Forecast and Management
Authors: Zhang Xiao Ping , Yang Xiao Xia
Published: November 2011

In the garment manufacturing, the application of intelligent technology on one hand can get judgments and conclusions in the process on the basis of objective analysis just like artificial experts, on the other hand, it can solve more complex problem and seek optimal production planning and control method in certain production conditions. This positive quality forecast system can direct us to select optimal processing link, the most reasonable materials collection, and predict the effect.
Parameterized and Modular Theory Used in Rapid Design System of Simi-Trailer Tanker
Authors: Wang Jin Gang , Cui Zhi Cheng , Liu Li Zhong
Published: November 2011

In order to improve the quality of semi-trailer tanker design, shorter the development cycle, lower cost, and combine with structural features of its own semi-trailer tanker, the use of modular design theory, a module partition, structural analysis and interface settings and other methods of semi- trailer to the overall structure of tanker design the general framework of semi-trailer tanker. With the UG/OPEN and Microsoft C++6.0 development tools, parameterize the parts of semi-trailer tanker. Developed in the context of the semi-trailer tanker UG rapid design system design module, and verify its feasibility.
A Novel Technique for Crack Resistance of Bulk Mass Concrete Pier
Authors: Zhu H.B. , Wang P.M. , Yan G. T. , Wang C.S. , Cheng Y.S. , Wu L.M.
Published: November 2011

The bulk mass concrete pier is esay to crack because of higher temperature contrast between inner and outer of concrete. Experimentation use admixtures to replace some of cement so as to low the hydration heat. Fly ash can decrease more hydration heat than granulated blast furnace slag. If 40 percent of cement in weight is replaced by same amount of blend admixture of fly ash and granulated blast furnace slag, not only the compression strength can meet the requirement of engineering design, but also the hydration heat reduce a lot. Meanwhile, this paper develops a novel lining fabric especially for concrete steel formwork to advance water-retaining property and warm-keeping efficiency, and to distract shrinkage stress by ways of veins of fabric. Because of developed lining fabric and optimized mixture in this paper, the cracking problem of bulk mass concrete pier is avoided.
The Application of New Blasting Technique on the Replacement of Soft Silt Foundation by Rock Filling
Authors: Zhang Jian Xun , Wang Xu Guang , Chen Shao Wen
Published: November 2011

Based on the limit analysis equilibrium theory for the soft soil foundation under rock filling load, a new blasting technique is developed on the main mechanism to soften the strength of soft silt and to relieve the inside pressure of different kinds of soft soil, and a set of design method of blasting destressing is proposed to replace soft silt by rock filling. This technique is applied in the rock filling embankment of a waterfront airport project, which makes a breakthrough to the designed application limit of the current technical codes and acquires a favorable effect of replacement by rock filling.
Properties of Pressurized Lost Foam Casting of Al-11Si Alloy
Authors: Niakan Ali Asghar , Idris M.H. , Ourdjini Ali , Karimian Majid
Published: November 2011

Lost Foam Casting, pressurized casting, solidification, mechanical properties. Abstract. The paper presents the result of investigation on aluminum-silicon (LM6) alloy cast using pressurized lost foam casting process. The study investigated the effect of pressure and sand size on hardness and roughness of the casting produced. Air pressure of 1, 2, 3 and 4 bars was applied on the solidifying alloy poured in mould of sand sized 40-60(AFS). The roughness and hardness of the casting was measured using Hobson (Surtronic 3+) and Vickers hardness testing machine respectively and reported in the average of ten readings. For roughness measurement of the solidified castings, measurement was conducted in 25mm run whilst 11kgf was applied for Vickers hardness indentation test. The results show that using of finer sand size besides applying pressure during solidification of LM6 alloy has significant influence on roughness and hardness of the alloy. Increasing the applied pressure and used of fine sand size expedited heat transfer from the melt to the mould and surrounding thus decreasing solidification time. Consequently, reduced casting surface roughness as well as increased in hardness.
Rapid Solidification Processing: Melt Spinning of Al-High Si Alloys
Authors: Alshmri Faraj
Published: November 2011

Rapid solidification processing is a technique used for refining the primary silicon and seems to be the most promising technique for the production of high Si Al-Si alloys (i.e. Si content greater than 17 wt.%). There are number of routes which can be used to produce rapid solidification, including spray methods, weld methods, and chill methods. Of these, melt spinning is the most widely used industrially due to its high cooling rate and the ability to process large volumes of materials. This paper summarizes melt spinning and rapid solidification, highlighting a potential production route for aluminium-high silicon alloys involving melt spinning followed by hot isostatic processing.
Synthesis of Zeolite Membranes from Coal Fly Ash
Authors: Shirakura Shigeo , Kojima Shukuhei , Tanaka Kazuhiro , Kita Hidetoshi
Published: November 2011

Zeolite membranes were successfully synthesized from coal fly ash by hydrothermal treatment onto 10-cm-long tubular porous supports. The membranes were characterized from XRD analysis, SEM observation and the pervaporation performance. Under the optimized conditions, LTA-type membrane from coal fly ash showed fairly efficient for the dehydration of organic liquids. The maximum selectivity reached more than 3000 with accompanying flux as high as 3.0 kg/(m2•h) for separation of 90 wt% EtOH aqueous solution at 75 °C.
Static Performance Parameters and Analysis of the Hydraulic Expansion Toolholder
Authors: Wang Shu Lin , Zhang Wei Zhan , Liu Gang , Zhou Bo
Published: November 2011

Based on finite element analysis, the static transmitted torque of Hydraulic Expansion Toolholder is validated. When Hydraulic Expansion Toolholder is on the static state, the article does the analysis of the contact region deformation and contact stress under different structure sizes. The calculation and the analysis results can provide theoretical guidance for Toolholder application and structure design.
Finite Element Simulation of the Residual Stresses in Butt Weld Plate of Aluminum Alloy
Authors: Yang Xiao Hong , Song Yong Lun , Ran Guo Wei , Xiao Tian Jiao
Published: November 2011

Finite element simulation is utilized in an aluminum alloy 2014 butt weld with the three kinds of welding processes, namely the filler wire Tungsten Inert Gas (TIG) welding, the laser welding and laser-TIG hybrid welding. The simulated results are in good agreement with the weld cross sections for the TIG and the laser welding, and basically in agreement with that for the laser-TIG hybrid welding using the actual welding parameters. Furthermore, the simulated results shown that the longitudinal residual stresses after welding are the largest for the laser welding and the laser-TIG hybrid welding, the maximum of which are approximate to 300MPa and are 1.2 times of that for the TIG welding. However, the residual stresses would be relatively decreased by backing molten with TIG welding and preheating before welding; the maximum longitudinal residual stresses for the laser welding and the laser-TIG hybrid welding could be decreased remarkably by about 50%.
Vibration Simulation of Articulated Dump Truck with the Variation of Longitudinal Center of Gravity Position of Rear Sprung Mass and Rear Suspension Stiffness
Authors: Zhang Xue Yan , Zhang Wen Ming
Published: November 2011

The paper is concerned with the vibration for the articulated dump truck (ADT) which is multi-axle vehicle and different from rigid dump truck. The balanced suspension was employed as the rear suspension in the 60t ADT which the paper takes as the research object. A vibration model of 6 dof for the truck was proposed. The impact of the variation of longitudinal center of gravity position of rear sprung mass and rear suspension stiffness on vibration was investigated in stochastic excitation of the truck in the frequency domain. It is found that it is beneficial to the comfort of the truck when the center of gravity of the sprung mass moves forward and the impact of rear sprung stiffness on vibration is not too great. The results of the vibration for the truck are provided for the design of the 60t ADT.
Development of Drill Monitor and Operation Mode Recognition Based on All Hydraulic Core Drilling Rig
Authors: Zhang Tao , Yan Tai Ning , Zhou Li Zhen , An Chuan De
Published: November 2011

For rocks complexity, geologic drilling is a high cost project, and it is high risk. Drill monitor is an important tool in monitoring drilling, scientific analysis and decision. It can continuously monitor drilling process, identify and forecast abnormal operation modes. It is the key means to reduce drilling accidents and ensure high efficiency, high quality and low cost. This paper analyzed some problems of domestic drill monitor based on the research status on drill monitor at home and abroad. Author considered all hydraulic core drilling rig with 2000m drilling capacity as research object, and modularly designed multi-drilling-parameter data acquisition system according to the geologic exploration own characteristics. This system can identify typical drilling operation modes used data handling techniques of wavelet analysis and time series analysis. With implement of state geology investigation strategy, drilling workload increase greatly, drilling depth increase continuously, and the drill monitor has a very wide application prospect.
Research on Starting Process of a Novel Wound Rotor Line-Start Permanent Magnet Synchronous Motor
Authors: Feng Gui Hong , Li Shuang , Zhao Min , Zhang Bing Yi
Published: November 2011

Squirrel-cage rotor line-start permanent magnet synchronous motor can not meet the heavy lifting, frequent starting conditions for the lifting requirements. In order to solve the difficult problem of starting caused by the squirrel-cage rotor line-start permanent magnet synchronous motor (LS-PMSM), a novel wound rotor line-start permanent magnet synchronous motor is proposed in this paper, which uses wound rotor to replace squirrel cage rotor. In this paper, the finite element analysis method is adopted to simulate and analyze the starting process of the motor, through reasonably determining the value of the external rotor resistance, the starting performance of the motor has improved greatly, and lead the motor smoothly into synchronous speed. The simulation results show the correctness and effectiveness of the research methods.
The Synchronous Control Study of once Forming Leaf-Spring Rolling Mill
Authors: Zhang Lei , Li Su Ling , Liu Guang Fei
Published: November 2011

This paper introduces working process of the once forming leaf-spring rolling mill, and specific to the problems that the two vertical rollers must realize synchronous control in the rolling process, puts forward the master-slave synchronous mode base on fuzzy control to achieve synchronous control. The various performance indicators of master-slave mode hydraulic synchronization control system are superior to the equivalence mode, and obtain satisfactory effect. Finally, fuzzy toolbox based on the MATLAB/SIMULINK simulates the systems respectively, and the simulation results prove the above conclusions.
Experimental Research on Regenerative Braking of Wheel-Hub Motor
Authors: Wang Bin , Wang Ren Guang , Cai Qun Ying , Sun Han Wen
Published: November 2011

The factors affecting regenerative braking performance of brushless DC motor(BLDCM) were analyzed by means of bench test and road test .the BLDCM was used as drive motor in a four –wheel-independent-drive EV. The relation between PWM duty and motor rotation speed, charging current and voltage were determined by test, which can benefit design of control strategy of regenerative braking for electric motor and help to improve energy efficiency.
Collapsing Pressure of Casing Located at the Bend Part of Casing-Exit Sidetracking Well
Authors: Tian Zhong Lan , Yang Heng Lin , Yan Xiang Zhen , Xu Zhi Qian
Published: November 2011

Depending on the mechanical characteristics of casing located at the bending part of sidetrack horizontal well, the calculation model of casing collapsing strength under the effect of bending load is established, and corresponding theoretical formulae is derived. During the process of deducing formulas, the influence of bending load on the casing section out of roundness is ignored, which made the calculation formula benefits intuition and practicality comparing to the T.Tamano formula. The result of this paper is verified through the simulation value and laboratory test of casing used in the Jilin oilfield. It shows that the formula of this paper can meet the engineering commands; the axial load is significant to affect casing collapsing strength, and in the actual production process should be strictly controlled.
Round-Guard System Based on the Vibration Cable Transducer
Authors: Sun Xiang Rong , Ma Hong Liang , Du Xiao Hua
Published: November 2011

Adopting a new kind of transducer technology vibration cable technology, can round-guard in large region without bodyguard whole day, and using display and warning on the end equipments may judge abnormal conditions occurred in what time and in what place. The system makes use of quadratic and own source filter, suppress the disorder waves induced in transducer, install two-rank amplifier which kernel being operation amplifier, especially for micro-vibration originating undercut can judge illegal invader, and can judge the invaders are human or heavy equipment according to vibration intensities.
Static and Dynamic Characteristics Study of Wind Turbine Blade
Authors: Zhu Jie , Cai Xin , Pan Pan , Gu Rong Rong
Published: November 2011

Structural analysis of wind turbine blade is a necessary part in the process of blade design. Based on the ANSYS software, the stress and strain distribution analysis of a kind of 1500kW horizontal axis wind turbine blade is carried out at the action of ultimate flapwise loads, the vibration mode shapes of this blade are also analyzed in this paper, thus providing some reference value for the larger-scale wind turbine blade on structural design.
Study of Fluxing Process for Hot Dipping Galfan Alloy on Steel Wire
Authors: Du An , Huo Yan , Hu Jie
Published: November 2011

Through the orthogonal experiment, research on the process parameters of the qualiity coating with the new auxiliary ,such as different pickled time, parched time, hot-dip time , and analyzed by scanning electron microscopy, X-ray diffraction. The results show that BiOCl is a new fluxing agent and the optimal parameters for pickled time, the parch time , hot-dip time, respectively,10s,120s,9s,through this we can get bright, smooth, corrosion resistant coatings.
Research of Catalytic Performance over Transition Metal Modified MnOx-CeOx/ACF Catalysts
Authors: Shen Bo Xiong , Liu Ting , Zhao Ning , Ma Juan , Hao Xiao Cui
Published: November 2011

The catalyst of MnOx-CeOx/ACF prepared by impregnation method was used for low-temperature selective catalytic reduction (SCR) of NO with NH3, and more than 90% NO conversion was obtained at 230°C. Fe、Cu or V was used respectively to prepare transition metal modified MnOx-CeOx/ ACF catalysts which had lower catalytic activity than that over MnOx-CeOx/ACF. SEM, N2 adsorption and NH3-TPD were used to analyze the catalysts. The results showed that transition metal modified catalysts had a reduced surface area, pore volume and surface acidity. SO2 had a negative effect on SCR performance of the catalysts. Fe modified catalyst exhibited SO2 tolerance in the first 6h in the presence of 100ppm SO2. Thermal treatment in N2 at 350°C was used to regenerate the deactivated catalysts by SO2. The decomposition of ammonium salts recovered the catalytic activity to some extent. The sulfated active components in deactivated catalysts after the thermal treatment enhanced the surface acidity of the catalysts.
Control and Robust Vision Relative Navigation for Autonomous Aerial Refueling
Authors: Guo Jun , Dong Xin Min , Wang Long , Li Hong Bo , Chen Yong
Published: November 2011

A relative navigation and control scheme based on multiple camera systems was presented for autonomous operations in close proximity for autonomous air refueling (AAR) mission. The relative navigation system employed non-iterative fast global optimal pose estimation algorithm, and the result was filtered and fused with velocity’s measurements to increase accuracy and robustness by using Kalman filtering algorithm. To attenuate effect of tanker’s vortex and atmospheric turbulence, an H-infinity tracking control law was designed for docking phase of air refueling. Simulation results showed that accuracy of both vision navigation system and trajectory tracking could meet requirements of aerial refueling.
Transient Stability Simulation by Explicit and Symplectic Runge-Kutta-Nyström Method
Authors: Wang Fang Zong , He Yi Fan , Ye Jing
Published: November 2011

The symplectic algorithm is a kind of new numerical integration methods. This paper proposes the application of the explicit and symplectic Runge-Kutta-Nyström method to solve the differential equations encountered in the power system transient stability simulation. The proposed method achieves significant improvement both in speed and in calculation precision as compared to the conventional Runge-Kutta method which is widely used for power system transient stability simulation. The proposed method is applied to the IEEE 145-bus system and the results are reported.
Research of Redundancy Management on Dual-Redundancy Brushless Direct Current Electric Rudder Loop
Authors: Ye Hong Bing , Chen Xin
Published: November 2011

Redundancy technique is an effective method to improve the ability of mission reliability, safety reliability and fault tolerant. With redundancy technique, it will increase additional system software and hardware resources, such as fault monitor module and channel switch module etc. In allusion to sensor fault, serial fault, controller fault and motor fault, this paper designs and researches the strategy of fault logic, fault management and fault reconstruction, appropriately distributes the system resources, thus effectively processes fault monitoring and isolating, and sufficiently improves mission reliability, safety reliability and fault tolerant ability of the dual-redundancy brushless direct current electric rudder loop.
Design and Achievement of the Erection Test System Controlled by Single Neuron PID Controller
Authors: Qiao Yun Ying , Guo Xiao Song , Zhu Zhi , Cun De Lin
Published: November 2011

To overcome the nonlinear and slow-varying factor in hydraulic system and the uneasy-building model of erection system, the single neuron self-adaptive PID controller is designed. To solve the conflict between the speed and the stability in erecting, The erecting system based on virtual instrument is designed. The system uses a data acquisition card simultaneously to acquire the test data and the feedback signal and control the hydraulic system, utilizes the module method and the technique of mixed-program between LabWindows/CVI and Matlab based on ActiveX technique to design application software. The results of experiment shows that the system with high precision of testing and controlling is operated conveniently and universally and can satisfy the requirement of the erection system.
Waveform Relaxation-Based Large-Scale Circuit Simulation for MOSFET and Lossy Coupled Transmission Line Circuits
Authors: Chen Chun Jung , Lee Chih Jen , Tsai Chang Lung , Chang Allen Y. , Shih Tien Hao
Published: November 2011

In this paper, we propose a modified Waveform Relaxation algorithm to perform large-scale circuit simulation for MOSFET circuits containing lossy coupled transmission lines that have been encountered in modern circuit design community, in which a full time-domain transmission line calculation algorithm based on the Method of Characteristic is adopted. New software techniques are proposed to enhance the robustness as well as efficiency of the simulation process. All proposed methods have been implemented and executed to justify the claimed advantages.
The Fine System-Level Calibration Technique of Size Effect Error for the Fiber-SINS
Authors: Zhu Lu Feng , Zhang Chun Xi
Published: November 2011

A fine system-level calibration technique of size effect error is presented for Fiber-strap-down inertial navigation systems (Fiber-SINS) in this paper. When the strap-down system is mounted onto high precision turntable and rotating along predefined trajectory, the velocity errors can contain information related to the size effect error, which can be estimated accurately by Kalman filter. In this paper, principles of the calibration technique are emphasized, the model of the size effect error is presented and Hardware-in-the-Loop Simulation platform is designed to validate the efficiency of this technique. Results show that the calibration technique has the advantages such as simplicity and high precision. Thus it is of great importance for practical applications.
Cascade Fuzzy Self-Tuning PID Control for the Liquid-Level Control of Double Water-Tank
Authors: Lin Yi , Ye Xiao Ling
Published: November 2011

Aiming at the liquid-level control of double water-tank, this paper discusses the application of fuzzy control theory in liquid-level control system and a cascade control method based on fuzzy self- tuning PID controller is proposed. The design method of this fuzzy self- tuning PID controller is put forward. The fuzzy self- tuning PID controller is designed and the control effect of three kinds control methods, the single loop PID control system, the cascade control system and the cascade control system based on fuzzy self- tuning PID are simulated with Simulink. The analysis and simulation results indicate that the overshoot, the adjusting time and the capacity of anti- disturbance of the liquid-level cascade control system based on fuzzy self- tuning PID controller are superior to those of the general single loop PID control and cascade control.
Salient Pole Force Analysis and Inhibition of Tubular Permanent Magnet Linear Synchronous Motor
Authors: Zhao Jing Hong , Zhang Jun Hong
Published: November 2011

In this paper, the reason of axial magnetized TPMLSM salient pole force has been discussed, as well as its calculation formula. Calculate force with the virtual work principle. Then the relation between the maximum with average of the force and its phasic forward angel, has been explained, as well as the function of salient pole force and its location. Furthermore, a kind of method notching iron magnet poles to decrease axial magnetized salient pole force has been introduced, and the influence impressed on the force by notching has been analyzed qualitatively. Obtained field distribution by finite element method slotted magnetic. Compared the salient force of different number slotted iron pole. In the end, finite element method has been utilized to testify the availability of this way to decrease salient pole force.
Modeling and Simulation of Propeller and Hull System for Marine Propulsion Plant
Authors: Li Ren , Zhang Wen Xiao , Li Hua Yan
Published: November 2011

Aiming at the complexity of mechanical devices and the polytrope of operating conditions for marine propulsion plant, the modeling and simulation of propeller and dull system are investigated based on MATLAB/Simulink. The simulation model of propeller and dull system is constructed in which the Chebyshev fit expression across four quadrants is given for the propeller. So it becomes practical to express static and dynamic properties of propeller and dull system. A luxury cruises fitted on two engines and two fixed pitch propellers is considered to perform simulation tests. The actual navigation conditions of marine propulsion plant, including starting, parking and reversing etc, are taken into account. The simulation results analysis illustrates the correctness and validity of modeling and simulation for propeller and dull system. Thus provides a new method for the optimization and design of marine propulsion plant.
Internal Model Control of Three-Phase Four-Leg Active Power Filter Based on Online LS-SVM ANN Inverse System Method
Authors: Qi Hong , Shao Zhen Hua
Published: November 2011

In dealing with the problem of the SAPF’s nonlinear and strong coupling model, the internal model control of three-phase four-leg active power filter based on online ANN method is studied in this paper. With the ANN’s nonlinear mapping ability of self-learning and self-organizing modeling, the inverse system can be approximated by online LS-SVM. In order to have a good linearization control effect, the internal model control based on ANN is proposed for the combined pseudo-linear system. This method can be used to design effective controllers for nonlinear system with unknown mathematical models. At last, the simulation results show that a good steady-state performance can be obtained under the improved method
Research on Stability of Networked Control System with Uncertain Time-Varying Delays
Authors: Ma Wei Hao , Jin Chao Yong
Published: November 2011

This note deals with the problem of stability for networked control system (NCS) with uncertain time-varying delay that is less than on sampling period. A new stability scheme was proposed. Using an Lyapunov function, less conservative stability sufficient condition was derived for such system based on liner matrix inequalities (LMs). Finally a numerical example shows the superiority of the method in this paper.
Experiment on Ultimate Shear Strength Parameters of Bolt Anchored Section
Authors: Gu Shuan Chen , Ye Gen Fei
Published: November 2011

The bolt support is one of the effective support means to stable the surrounding rocks in underground projects. To determine the ultimate shear strength parameter between the surrounding rocks and bolting mass interface would have important project value to the bolt support design. In order to easy and accurately determine the shear strength of the bolting layer in the bolt design, based on elastic-plastic theory, a theoretical model under the bolt pulling function was established. The load transmission function during the bolt function process was derived. The theoretical relationship between the limit shear strength parameter of the bolting layer interface and the bolt pulling test curve was obtain. The shear strength parameter between the resin anchoring agent of the bolt support in mine roadway and the coal rock mass was determined. The results show that with the bolt pulling test curves, the cohesive strength of the bolting layer and the shearing rigidity coefficient of the bolting layer interface could be easily obtained and could provide the references to the bolt support design.
New Method to Ameliorate the Large Telescope Speed Smoothness
Authors: Liu Jin Xing , Li Hong Wen
Published: November 2011

After rising the smoothness problem of the telescope low speed condition, we develop a new servo controlling method for large optical telescope that combine PID with repetitive controller. Analysis shows that this controller has a strong ability to overcome the periodical disruption and a rapid reaction to any action. Working with the improved repetitive controller can achieve a high precision. Practically, we reach to the target successfully.
Analysis on Ground Subsidence in Underground Mining
Authors: Liu Xin Xi , Wang Xue Zhi
Published: November 2011

Analysis on the characters of ground subsidence of Yangjiaping mining area, with same excavation depth and recovery coefficient, the numerical simulations to nonlinear large deformation using finite-difference method(FLAC) are achieved on the different strip extraction schemes that adopted different mining and reservation width. The result indicates that the subsidence values and horizontal deformation increases with the increasing of the strip extraction width on condition of the same recovery rate. Based on probability density function (PDF) method, the relationship of the coal pillar width, the mining width and ground deformation is acquired, which is some useful reference for using the strip extraction method to control the surface movement and deformation.
Numerical Simulation of Flow Field in Burnt Lime Hydrator
Authors: Bai Ming Hua , Zhang Yu , Wang Qiu Fang
Published: November 2011

The flow field distribution in burnt lime hydrator has been investigated by a software FLUENT, with k-ε turbulence model and MRF method. The simulation result shows that when four blades deflect 30°, the whole velocity gradient of flow reduces and the recirculation zones also diminish; when the rotational speed is 75r/min, the turbulence kinetic energy of stir zone between two axes becomes larger, which can raise stirring effect and reduce fugitive dust, so it is easy to achieve the purpose of improving the environment of work condition.
Thermal Stress Simulation of the Surface Grinding
Authors: Hua Chong Lue , Wang Gui Cheng , Pei Hong Jie , Liu Gang
Published: November 2011

Thermal stresses of grinding plays an important role on the fatigue and wear resistance of the component. A comprehensive analysis of thermal stress induced by surface grinding has been conducted with aid of the finite element method. To obtain a reliable figure of thermal stress induced by grinding, temperature-dependent properties of workpiece materials were taken into account. The developed finite element procedure has also been applied to calculate the surface and sub-surface thermal stress induced by moving source of triangular heat when convection and radiation is occurred over the whole work. Based on an analysis of the effects of wheel velocity on the thermal stress distributions in an elastic-plastic solid, some important conclusions were given.
Application of Embedded Technology for Induced Polarization Instrument
Authors: Zhang Qi Sheng , Deng Ming , Wang Qi , Feng Yong Qiang , Yang Rui
Published: November 2011

Induced polarization method is one of common methods for electrical prospecting of geophysical. The paper is to analyses and research application of embedded technology for induced polarization instrument and design multifunctional transceiver instrument. The paper is to realize hardware part of induced polarization instrument by regarding ARM processor as hardware core by combination of current intelligent power module (IPM), induced polarization analog signal processing and 24-digit △-∑ high-precision A/D conversion chip (CS5532), etc. It can transplant embedded operation system (uClinux) on embedded ARM processor and formulate drive program which matches hardware circuit and application program to fulfils various functions including data acquisition, data processing & display, data storage & transmission required by induced polarization instrument under uClinux system management.
Research of Closed-Loop Calibration Model Based on Kalman Filtering Algorithm
Authors: Ma Zhi Qiang , Cheng Yuan Zeng , Sun Shi Yu , Wang Chun Ping
Published: November 2011

The firing calibration of Artillery fire control system with closed-loop calibration manner can improve the firing accuracy significantly. The miss distance prediction is the theory core of closed-loop calibration. Whether the prediction algorithm of closed-loop calibration corrects or not is directly related to the calibration’s success or failure. Mainly for the external error sources not caused by fire control computer system, this paper established a closed-loop calibration model based on Kalman filtering algorithm, researched the specific implementation process of algorithm model, and applied the MATLAB software simulating the model. Simulation results show that the closed-loop calibration model based on Kalman filtering algorithm can significantly inhibit firing error and is a feasible algorithm and provides a good theoretical basis for forecasting error.
Research on Numerical Simulation of Dynamic Pressure for Stress Sensibility Coal Seam
Authors: Ding Yun Hong , Wang Bao Hui , Yan Xiang Zhen
Published: November 2011

Based on the orthotropic physical properties of coal cleats, the fluid-solid coupling model for stress sensibility coal seams is established. The equations of the coupling model are solved by using the finite element method. The history matching for JS-3 well in Ordos basin is carried on by using the coupling model. The comparison between calculated results based on the coupling model and the measured values indicates their good agreement, which verifies the accuracy and rationality of the model. The effect of the permeability orthotropic coefficient of coal cleats on the pressure distribution in coal seams is analyzed. The results show that the pressure along the butt cleats direction increases with permeability orthotropic coefficient increasing; The pressure along the face cleats decreases with permeability orthotropic coefficient increasing between 0m~30m and 170m~200m, whereas both increases from 30m to 170m.
Alleviate Stressful Voltage Condition of Power System by Means of Adjusting the Generation Mode Considering Energy Saving
Authors: Qiu Ge Fei , Shu Hong Chun
Published: November 2011

In this paper, a new method based on modal analysis and CPF method devoting to designing of generation adjusting plan which can alleviate stressful voltage condition considering energy saving is proposed. The voltage stability condition has relation with the generation and load distribution modes, usually only adjustment of load distribution modes has been noticed when there is a need to alleviate stressful voltage condition. Noticing that properly modification of the generation mode under stressful voltage stability condition can also reduce the power loss of power system and enlarge the voltage stability margin, a fast generation adjusting strategy designing algorithm is proposed. In the mean time, coal consumption of each generator is also considered. Participation elements is employed in this method to select the generators which are effective in adjusting process, continuous power flow calculation algorithm is used to trace the variation of power loss in power system. The simulation result on IEEE 39 system show that the method proposed by this paper can modify the voltage stability condition and enlarge stability margin to certain extent.
Study of Voltage Level Sequence Based on the SE-DEA Model
Authors: Gao Qing Min , Zhang Qian Ye
Published: November 2011

In order to solve the complexity of the power system planning in the low carbon electricity situation, SE-DEA (Super-Efficiency Data Envelopment Analysis) algorithm is firstly applied to the field of program evaluation sequence voltage and described the evaluation process of voltage level sequence. The network size, the total power loss, integrated power supply reliability, cost in investment and integrated area are introduced to improve the distribution network planning of evaluation index system based on the traditional comprehensive evaluation index system and apply this model program by the corresponding calculated, Through comparative analysis the optimal sequence of voltage options, finally verify that the model is reasonable and effective.
The Research and Analysis Based on a New Hybrid Chaotic Sequences
Authors: Zhou Xue Song , Li Man , Ma You Jie , Liu Si Jia
Published: November 2011

The chaos sequence generated by the chaotic map methods usually has unsatisfactory performances. To solve this problem, this paper proposes a novel method with chaos sequence, which blends the Chebyshev chaotic map and one-dimensional chaotic map with infinite collapse in finite interval. Both MATLAB simulations and performance analyses results show that the proposed method has much improved chaotic performances than the single Chebyshev sequence or the chaotic sequence with infinite collapses, by analyzing and simulating the sequence of traversal feature, period doubling properties, Lyapunov exponents, initial value sensitivity, autocorrelation, and the uniformity of sequence.
A Procedure for Modeling of Holonic Control Systems for Intelligent Building (HCS-IB)
Authors: Da Silva Robson M. , Arakaki Julio , Junqueira Fabricio , Filho Diolino J. Santos , Miyagi Paulo E.
Published: November 2011

Faults occurrence is inevitable in real world and a practical alternative approach is the reduction of fault consequences. Despite of this, the majority of buildings control systems do not have such mechanisms. Thus, this work proposes a procedure for the modeling of control systems for intelligent buildings which considers their functional specifications in normal operation, and in case of faults occurrence. The procedure adopts the concepts of discrete event system, holon, and Petri net and its extensions. It is presented some models derived from case studies, and mechanisms to fault-diagnosis, decision and reconfiguration.
Research and Analyze on the Lightning Test of Aircraft Model
Authors: Wen Hao , Wang Hong
Published: November 2011

According to the China Aviation Industry Standard HB6129 “The requirements of aircraft lightning protection and test method” and standards of foreign countries. The high voltage generator was used to make the lightning attachment point test on a scale model of airplane. The lightning attachment zone was determined, and the result was agreed with the actual lightning experience of F-4 aircraft. The technical factors such as test method, the model scale, gap spacing, and polar discharge relative positions in respect to the model are related to the laboratory test; the lightning discharging theory will be discussed in detail. The test method has been proved feasible and the experience of test research work has accumulated for future use.
Design of Double Closed Loop Control System of Automatic Clutch
Authors: Shi Qing Ping , Mo Yi Min
Published: November 2011

The control system of automatic clutch is based on the manual gearbox instead of the clutch pedal. It realizes automated clutch and manual shifting. The essence of automatic clutch is how to control the motor drive unit to achieve the implementation of the automatic clutch separation and bonding, and thus automatic speed technology of motor is the key. In this paper, combining the characteristics of micro-car, a double-loop automatic motor speed control system is designed. The design is proved reasonable and feasible through simulation based on MATLAB.
Modeling and Simulation of Electric-Hydraulic Clutch on Light Vehicle
Authors: Qu Jin Yu , Wang Dong , Zhang Yi Rui , Qu Gui Xin
Published: November 2011

With high efficiency, simple structure and low cost, Automatic Mechanical Transmission (AMT) is suitable for the development and application of light vehicles. The control of clutch is emphasized on in the shifting process. It is necessary to study the control of engagement speed. In this paper, the electric-hydraulic clutch applied on light vehicles is modeled and the engagement process of clutch during vehicle starting simulated. After analyzing the operation quality of clutch with different engagement speeds, the speed variable control strategy is proposed. According to the strategy, engagement speed changes with the development of different operating stages. At last, the simulation is carried out to verify the feasibility and superiority of this kind of strategy.
Study on Improving Power System Damping Characteristic in Novel Excitation System
Authors: Yang Pei Hong , Cui Gui Mei , Liu Wen Ying
Published: November 2011

A novel excitation system based on full controlled devices rectifier is proposed in this article, and the excitation system can provide double kinds of damping for power system by controlling the excitation voltage of DC side and exchanging reactive with generator. Through the Mat lab / Simu link simulation platform, a circuit model is established. This paper presents a current feed forward decoupling control method and the active and reactive current can be controlled independently by the method. The simulation results of two-area including four generators system shows the system damping ratio is improved significantly, and has better dynamic performance than conventional excitation system .
A Simple Method of ABS Optimal Slip Ratio Identification
Authors: Zhao Ling , Tang Lan
Published: November 2011

The difficulty of anti-lock braking system based on slip ratio lies in acquiring the optimal slip ratio of various pavements. In this paper, a method based on slip ratio change direction and adhesion coefficient change direction and variable quantity, is proposed to identify optimal slip ratio. The fuzzy controller was designed and the computer simulation was fulfilled for single pavement and variable pavement. The results show that this method has better accuracy, calculation amount small and in real-time.
Numerical Modeling and Solution of Ground Water Inrush at the Baixiangshan Iron Mine
Authors: Wu Di , Cai Si Jing , Wang Wen Xiao
Published: November 2011

The Baixiangshan iron mine is a large scale underground mine under construction, and will be put into production in 2011. As hydro-geological conditions of the mine are extremely complicated, ground water inrush happened twice during excavation of the ventilation shaft in 2006 and 2009 respectively. The purpose of this paper is to control the ground water inrush and guide the safety production of the mine. Hence, the ground water state was firstly analyzed through the data of borehole and hydrologic geology. After that, hydro-geological models of the ground water system were built up. According to the hydro-geological models, mathematical models of the ground water were established. With the help of the software of Processing Modflow for Windows (PMWIN), the numerical model of the ground water was set up. Then, by using the SOR (Successive Over-Relaxation) iterative method, the numerical equations were solved. Finally, the district ground water inflow rate on the main mining levels and the dangerous districts of the ground water inrush was figured out. The results of the numerical solution are significant to the control of ground water inrush in the Baixiangshan iron mine.
The Research of Traveling Wave Fault-Location Methods for the 10kv Distribution Networks
Authors: Ding Qiao Lin , Yang Zhen Dong , Xu Ru Jun
Published: November 2011

The 10kV distribution networks have complicated geographical environment and the lines with many branches, as well as high grounding resistance at fault point, thus result the difficult of locating fault. Traveling wave fault-location methods locate fault by the time of traveling wave from fault point to receiver or wave subtraction from fault point to two sides receivers, and the advantages of the methods are fast and have high precision. This paper introduced A, B, C, E four types traveling wave fault-location methods and their characteristics. Many simulations are taken for single-phase earth fault in a 10kV power distribution line with branches. By comparing the waves reflected from normal line and the fault one, the fault distance is determined by the first distortion point. As a result, the simulations indicate that the fault-location precision meet the actual requirement, Type C traveling wave fault-location method is feasible for the fault location in distribution networks.