bluuebunny/crossref_metadata_2025 huggingface dataset:
Effect of Cold Energy Storage of Multi-Wells Aquifer Thermal Energy Storage in Sanhejian Coal Mine
Authors: Zhang Yi , Guo Dong Ming
Published: November 2011

In practical work, implementation of the technology of aquifer thermal energy storage(ATES) is divided into energy storage phase and energy utilization phase. Sufficient cold/warm water is stored in energy storage phase, and the stored cold/warm water is consumed in energy utilization phase, so as to achieve the purpose of cooling or heating. In this paper, taking Sanhejian Coal Mine as an example, we analyze the effect of cold energy storage in multi-wells by analyzing the volume change of cold water body within different temperature ranges in different periods. Through the analysis of volume change of cold water body, it can prove in the cooling process, all of the 2-5°C cold water body is consumed, and then the 5-10°C cold water body is consumed. The volume of 10-15°C cold water body is stable, because with the consumption of colder water, part of low temperature water body changes into high temperature water body, adding the 10-15°C cold water body in aquifers. And in condition 1, there are almost the same volume of 2-5°C, 2-10°C and 2-15 °C cold water in the four cold energy storage wells.The running of 1-1’ wells, 2-2’ wells, 3-3’ wells and 4-4’ wells by sequence, all of the 2-5°C cold water body is consumed, and the 5-10°C cold water body is the mainly cold water body for cooling, and the consumption of 10-15°C cold water body is small. It proves that the cooling wells normally run, and the cold water body for cooling is sufficient, which can meet the need of cooling.
Molecularly Imprinted Microspheres for Highly Selective Separation of Diosgenin
Authors: Hou Jing Yi , Han Xiao Yan , Zhang Ye , Ding Shu , Ye Lei
Published: November 2011

Molecular imprinting polymers (MIPs) are synthetic materials having specific cavities which are highly specific towards the template molecule. In this paper, diosgenin-imprinted polymer microspheres (DG-MIPs) were prepared by precipitation polymerization, using diosgenin as template, methacrylic acid as functional monomer and ethyleneglycol dimethacrylate as crosslinker. The morphology and adsorption capacity of the microspheres were evaluated by HPLC and Scanning electron microscopy (SEM). The optimal reaction conditions were as follows: 2 mM DG, 6 mM MMA, 60 mM EGDMA and 4 mM AIBN. The method developed might be used to separate and extract effective constituents from Chinese medicinal plants on a large scale.
Effects of Accelerated Aging Period of Time at 180°C on Tensile Strength of 3-Dimension-4-Direction Braided/Epoxy Resin Composites
Authors: Liu Liang Sen , Song Lei Lei , Li Jia Lu
Published: November 2011

The tensile strength of 3-dimension-4-direction braided/epoxy resin composites after accelerated aging for different period of time at 180°C was investigated. The tensile tests of 3-dimension-4-direction braided/epoxy resin composite samples without aging and aged 60 hours, 120 hours, 180 hours, at 180°C were carried out. The damage forms of braided composite samples tested were investigated. The experiment result indicates that the accelerated aging process at 180°C has obvious effect on the tensile strength of braided composite samples. The average tensile strengths of composite samples aged 60 hours, 120 hours, and 180 hours period of time at 180°C are 86.29%, 88.59% and 84.12% of average tensile strength of braided composite samples without aging, respectively. This means that the tensile strength of aged braided composites will be decreased. The damage form of samples tested shows that after aging for a long time at 180°C, the resin is damaged badly and becomes brittle which make the bonding force between fiber and resin decrease. This is the reason of the decrease of tensile strength of composites after accelerated aging at 180°C.
The Simulation and Analysis of Groundwater Flow in Rock
Authors: Han Hao Liang , Cui Bo , Gao Yong Tao
Published: November 2011

Water underground is one of the most important factors which influences the strength of the rock and soil. In this study, we get the governing equation and simulate the process of water transportation in rock. Groundwater flow is modeled by a ground-water flow model and the partial differential equations can be solved by using finite element method.
Investigation on Time Series Stiffness Spacing Model for Steel Structural Sound Condition Diagnosis of Tower Cranes
Authors: Yan Yu Qin , Song Shi Jun , Qiao Cai Feng , Dong Mei Ling , Wang Sheng Chun
Published: November 2011

Damage recognition and diagnosis for large-scale structures on line need suitable models and practical algorithms, which have less computational complexity and demand less memory, to be realized by microcontroller or microcomputer. In this paper, the AR(n) time series model and the recursive least square method are chosen to establish the dynamic model for the monitoring data of the tower crane’s top inclination. A judgment criterion for steel structural sound condition of tower crane is proposed. The Time Series Stiffness Spacing Model (TSSSM) is established according to the feature model of the tower crane’s top inclination under the normal condition. The experimental results show that the model can accurately identify the steel structural sound condition of the tower crane. So the model has the practical value for damage alarming online.
State and Trends of Test Technology on Hygienic Properties for Leather Shoes
Authors: Peng Wen Li , Shi Li Xia , Zhang Wen Ni
Published: November 2011

A hygiene property of leather shoes, which has great influence on health and comfort, mainly contains air permeability, water vapor permeability, hygroscopic, heat preservation and antimicrobial ability. The developing situation of test technology on hygiene properties of leather shoes is summarized. Natural leather has excellent hygiene properties for its collagen fibers, each hygiene property is not isolated and there are complex relationships between them. But the properties are studied separately basically. It is necessary to launch an overall point of analyzing and testing hygiene properties of leather shoes. Grey system theory is introduced to determine the weightiness of each factor of hygiene properties, and decide which factor should be improved and which ignored. The prospect of analyzing the hygiene properties using gray system theory and establishing a testing standard of hygiene properties of leather shoes are forecast.
Effect of Sucrose, Lactose, Glucose, Maltose on Survival of Lactobacillus acidophilus during Freeze-Drying
Authors: Chen He , Ma Zhen Xing , Shu Guo Wei , Qin Tao , Cai Ning Gang
Published: November 2011

In the present study, the experiments were investigated with effecting of sucrose, lactose, glucose, maltose on survival of Lactobacillus acidophilus during freeze-drying. In order to reach sufficient numbers viable cells, so different concentrations of protective agents were designed in the experiment, which as 3%, 6%, 9%, 12% and 15%, respectively. Measuring the survival ratio of Lactobacillus acidophilus and number of viable cells after completed drying. There were significant differences in survival during freeze-drying. Results showed that the protective agent was a critical factor affecting the survival of Lactobacillus acidophilus. In the experiments, the highest survival rate was soluble starch as the protective agent, and when the protective agent as galactose the number of viable cells was largest.
Study on Recovering Iron from Smelting Slag by Carbothermic Reduction
Authors: Liao Ya Long , Chai Xi Juan , Li Jiang Tao , Li Dong Bo
Published: November 2011

In order to recover the iron in copper smelting slag quenched with water in smelters, carbothermic reduction was adopted to reduce the iron oxide existing in different phase such as fayalite,vitreous and magnetite in the slag to metal iron. In the optimum conditions, it was demonstrated that the metallization efficiency of iron could reach more than 86.1%. Furthermore in the process the calcium carbonate is used not only as desulfurization agent，but also as accelerated gasification of solid carbon，which improved the ratio of CO among reaction atmosphere and enhanced the reduction rate of iron oxide as well as increased the metallization rate of iron．In addition this study proved that the combination ability between calcium positive ion and silicon oxygen anion is bigger than that between iron positive ion and silicon oxygen anion. As a result SiO2 combined with CaO and FeO existed in a form of freedom state which guaranteed the reduction process went with a swing.
Synthesis and Characterization of C-N-Cl-Codoped TiO2 with Enhanced Visible Light Response
Authors: Nie Long Hui , Huang Zheng Qing , Zhang Wang Xi
Published: November 2011

A novel visible-light-active C-N-Cl-codoped TiO2 photocatalyst was prepared by a simple process. The as-prepared sample was characterized by XRD, XPS, and UV-Vis. The analysis results showed that the as-synthesized sample was anatase and possessed a narrow bad gap of 2.4 eV after the doping of carbon, nitrogen and chlorine. An obvious absorption for visible light was observed in the range of 400~700 nm for C-N-Cl-codoped TiO2. By degrading of methyl orange (MO) solution under the visible light (l>420 nm) irradiation, the synthesized photocatalyst showed 5 times photocatalytic activity than that of P25.
Numerical Simulation and Analysis of Rock under Hydraulic Fracturing Based on Acoustic Emission Monitoring
Authors: Kang Zhi Qiang , Zhou Yun Fei , Wang Run Sheng
Published: November 2011

According to the problem of mine water bursting frequent accidents when Mine into the deep mining. Based on the theory of fluid-solid coupling, accounting for the effect on permeability by damage and stress. Analysis of influence factors what hydraulic fracturing process, fracture propagation pattern, and influencing factors including shape and magnitude of inlet hole, stress conditions, and specimen strength were investigated. Hydraulic fracturing is not only a natural action but also an artificial method to alter rock structure. Application of rock failure process analysis software coupled seepage-stress F-RFPA2D, numerical simulated rock water pressure to cause crack rupture instability process, research the fracture law of the rock on water pressure and vertical loading. Combine similar physical experiment model, contrast analysis of two broken results and stress-strain curve, reveals instability mechanical behavior of rock hydraulic fracture process. Obtain deep mining in the process of mine water seepage and water extrude, overburden rock crack up, expand, water seepage, water extrude, instability rupture process rules. numerical simulation results and experimental results has good uniformity, for disaster of the mine water extrude has immeasurable prediction practical.
Silica Sol-Gel Film on Bright Nickel Plating of Steel A3 Substrate
Authors: Zhou Qi , Zhao Hong Liang , Li Shuo
Published: November 2011

At present, ceramic coatings have attracted more and more attention for its good resistance, good chemical stability, and high temperature resistant, hydrophobic and other properties. SiO2 sol was prepared by chelated silicon powders to prepare SiO2 sol-gel film on the nickel plating layer. Pre-plating ordinary bright nickel-plating layer and composite bright nickel plating layer on the iron surface in advance, research some properties such as abrasion resistance, porosity, and NaCl solution soak test of SiO2 sol-gel films by changing the times of immersing SiO2 sol and baking temperature after immersing. The results show that: The time of emerging rust points for sol-gel coating on composite bright nickel-plated is much longer than that on ordinary bright nickel-plated in salt water soak test. The porosity of sol-gel coatings on composite bright nickel-plated is lower than that on ordinary bright nickel-plated. When the drying temperature is at 400°C or 500°C, the porosity rate is zero for the composite bright nickel without coatings or coated with any times of sol. It can improve wear resistance of the composite bright coating when immersing SiO2 sol at 500°C for 3 to 5 times. Porosity of SiO2 sol-gel coatings on the ordinary bright nickel layer is zero when baking at 500°C, immersing 3 times or more than 3 times. The best drying temperature is at 500°C, the best immersing times is 4 times to obtain better corrosion resistance for the bright nickel deposits. The color of the better appearance for a film is rainbow, its drying temperature of 500°C, immersing 4 times.
Analysis on the Sensitivity of Structure in Girder Steel Bridge Deck Pavement
Authors: Zhang De Jia , Ye Fen , Jiang Guo Jie , Wu Jin Ting
Published: November 2011

Bridge structure has important impact on pavement stress, and previous research often analyses separately which is one of the reason for pavement disease. This paper analyses the sensitivity of structure in girder steel bridge deck pavement with the finite element method, obtaining the changing regularity of maximum transverse strain, maximum longitudinal strain, maximum longitudinal displacement of pavement surface, interlaminar shearing stresses with six kinds of the structure design parameters including bridge roof slab thickness, diaphragm plates distance, U rib width, distance, thickness, girder space under the most unfavorable load. The study can offer help for the determination of bridge structure design parameters.
Experimental Study on Polycarboxylate High-Performance Superplasticizer Use in Tunnel Segment
Authors: Feng Li , Wang Yu Ce
Published: November 2011

Among the many super plasticizer, polycarboxylate super plasticizer because of its high water reduction rate, good slump, low admixing v olume and no significantly retarding have become a emphasis in the development and application. This paper through the experiment to determine super plasticizer use in project and tested the water reducing agent performance. The results show that when the defoamer admixture is 0.05%, the water-reducing agent can meet the subway segment concrete workability and mechanical property requirements. Suitable for segment concrete in actual production.
Research on Impact Factor of Simple Composite Box Beam under Vehicle Loads
Authors: Li Yun Sheng , Shi Li Li , Li Shuai
Published: November 2011

Commonly the vibration due to vehicle loads has no apparently impact on highway bridges, but it is unneglectable when the heavy vehicles load on highway bridges. The impact factor is usually used to define the dynamic effect under vehicle loads in most design code. In this paper, the models of simple composite box beams with different span and the models of two simplified heavy vehicles are established respectively. The impact factors are calculated when the heavy loads pass though bridges at different speed under different load conditions. In addition, the change laws of the impact factors and the influence of different vehicle models on the impact factors are analyzed. Analysis results show that, not only the impact factor are increased with vehicle speed, but also the amplitude and period are all increased. In normal speed range, the influence of speed on the impact factors appears rising trend overall. For the bridge with same span, the impact factors under the double wheel load are smaller than that under single wheel load.
Novel Geminal Dicationic Ionic Liquid as Stationary Phase for Capillary Gas Chromatography
Authors: Liu Tao , Zhang Lin Xia , Sun Li Quan , Luo Ai Qin
Published: November 2011

One geminal dicationic ionic liquid (IL) was synthesized and coated in column as stationary phase for capillary gas chromatography (CGC). In this study, two times imidazolium cations were reacted with 1,4-bis(chloromethyl)-benzene and then the anions exchanged to bis(trifluoromethylsulfonyl)-imide (NTf2-). The new ILs was coated statically in capillary column. The outcome of the stationary phase was evaluated by separating Grobs mixture, n-alkanes mixture, alcohols mixture and aromatic position isomers mixture such as xylene, nitrotoluene, dichlorobenzene and cresol. The results indicated that new IL possessed good column coating properties and chromatographic separation abilities.
DFA Based Predictability Indices Analysis of Climatic Dynamics in Beijing Area, China
Authors: Li Miao , Xia Jun , Meng De Juan
Published: November 2011

In this paper, detrended fluctuation analysis is used to calculate the Hurst exponent, the fractal dimensions and finally the climate predictability indices of monthly and seasonal time series of air temperature, surface pressure, precipitation, wind speed and relative humidity for Beijing meteorological stations, in which the meteorological data cover a period from 1951 to 2009 and the precipitation data own a series of 286 years (1724~2009). And we found that at the monthly scale, the predictability of precipitation and wind speed was not controlled by temperature and pressure. A strong negative correlation showed for precipitation VS. temperature and pressure, and the persistence trait of wind speed just depended absolutely on itself. At the seasonal scale, all three meteorological parameters existed negative persistence behavior with temperature and pressure in winter. In spring, the persistence behavior of precipitation is in step with that of temperature and pressure, and for wind speed and relative humidity, it got unconformable results.
Seismology Based Ground Motion Attenuation Relationship for Sendai Area
Authors: Tao Zheng Ru , Tao Xia Xin , Wang Xi Wei
Published: November 2011

For regions without adequate strong ground motion records, a method is developed to establish strong ground motion attenuation relationships, based on the stochastic method. Sendai area of Japan is selected as the target, since there are enough data from seismographic observation for calculation, and those from strong ground motion observation and some empirical relationships for result testing. Three parameters related to regional source and crustal medium are inversed by the micro-Genetic Algorithm. Total of 240 records from 77 small events, recorded by F-net, are adopted for the inversion. Fourier spectra are adopted as the objective function. These parameters are then taken into the stochastic method to estimate PGA. The regional ground motion attenuation relationships are compared with some strong ground motion records from K-NET and some empirical relationships to illustrate the reliability of this method.
Dynamic Response Characteristics of Underground Powerhouse Caverns for Sandaowan Hydropower Station
Authors: Shen Zhen Zhong , Ren Hua Chun
Published: November 2011

According to the practical situation, the 3-D finite element model of Sandaowan underground powerhouse caverns on Taolai River is set up for analyzing the behaviors under earthquake action. Based on static stress field of the surrounding rock mass, and with the selection of appropriate seismic waves for dynamic time-history analysis method, the dynamic responses of underground powerhouse caverns are analyzed. It is shown that the time-history waveform of dynamic displacement of given points has a very similar variation regularity with that of acceleration, and the wave phases of both are almost synchronous. The dynamic displacements and principal stresses of the given points on rock walls are with the vibration of low-frequency characteristics, the acceleration response is with the vibration of high-frequency characteristics.
The Study and Simulation of the Fabric Defects Images Restoration
Authors: Zhang Li Hong , Liang Ying Bo
Published: November 2011

By using non-negativity and support constraints recursive inverse filtering ,blind image restoration can be realized. But it’s difficult to resolve the proplem of sensitive to noise,so there has been no practical application. In this paper,according to the characteristic of NAS-RIF algorithm and the question of fuzzy by fabric defects images moving at a high-speed line, methods have been introduced, firstly, Adopt boundary keep smoothing filter as the de-noising pretreatment was carried out for image signal; Secondly, in each iteration of restoration,add the low-pass filter link。Thus,the problem of NAS-RIF algorithm is solved well.The simulation results show that this method has a satisfactory outcome both in visual impression and quantitative analysis.
Mix-P2P Architecture of Distributed Storage System Based on HDFS
Authors: Wang Zhan Jie , Zhang Li Jun
Published: November 2011

Aiming at the most popular Hadoop's master/slaves architecture in cloud computing, this paper presents new distributed storage architecture—MP2PDSA. Firstly, this architecture built a P2P network of SuperNodes without any master, which changed the master control of HDFS. Through the SuperNodes' collaboration, MP2PDSA enabled the storage system no longer rely on central control, which has effectively overcome Single-Point Failure, performance bottlenecks and so on. Secondly, in order to increase the availability of the whole storage system, through the coordination mechanism of P2P_SuperNodes, MP2PDSA achieved a rapid time to take over the failure subgroup without any manual intervention. Finally, MP2PDSA has a high scalability and availability compared with HDFS
The Design of Mining Equipment Operating Status Monitoring System
Authors: Jia Xiao Fen , Zhao Bai Ting , Li Zhen Bi
Published: November 2011

To reduce the frequent occurrence accidents of mining areas, a set of monitoring system of monitoring the operational status of mining equipment is designed. The information of electromechanical equipment are collected by the on-off sensors with anti-interference, which are converted to the standard RS485 interface signal though the MCU（Microprogrammed Control Unit）, and transmission to the monitoring platform by the bus transfer. The monitoring system is convenient and saves the cable, which can monitor the operational status of the field devices with accurate and real-time.
Study on the Optimization Process Technology in NC Machining Based on the Polychromatic Sets Theory
Authors: Liu En Fu , Liu Xiao Yang , Fang Yi Xiang
Published: November 2011

Polychromatic sets theory is used for boxes parts CAPP expert system so as to store knowledge rules of selecting machining method in form of contour matrix. Through the logic operation of coloring in the knowledge based, the machining schemes relating to the features can be obtained. Genetic algorithm is used to sequence machining step in the machining center to make the process of sequencing machining step more flexible and convenient, and the result of sequencing machining step more reasonable.
Prediction of Tensile Behavior of DP 590 Steel Tailor Welded Blanks by ANN
Authors: Dey Susanta Kumar , Ganesh Narayanan R. , Gurunathan Saravana Kumar
Published: November 2011

The forming behavior of Tailor Welded Blanks (TWB) are greatly influenced by blank conditions like thickness ratio, strength ratio, weld conditions like weld orientation, weld location, and weld properties. Designers will be greatly benefited if an ‘Expert system’ is available that can deliver forming behavior of TWB for varied weld and blank conditions. This work primarily aims at developing an expert system based on Artificial Neural Network (ANN) to predict the tensile behavior of TWBs made of DP 590 Steel grade base material. ANN models are developed based on full factorial and L27 orthogonal array design of experiments method and the results are compared. Through out the work, PAM STAMP 2G® finite element (FE) code is used to simulate the tensile behavior. The strain hardening exponent ‘n’ and strength co-efficient ‘K’ are predicted and used to train the ANNs. The results obtained from expert system/ANN models are validated by comparing them with the results obtained from FE simulations for chosen intermediate levels. The results are encouraging with acceptable prediction errors.
Design a Low Noise 5GHz Differential Cross-Coupled VCO and Colpitts VCO Using BiCMOS Technology
Authors: Nemati Sare , Najafabadi Neda Kazemy , Dousti Massoud
Published: November 2011

This paper describes the 0.35 um SiGe BiCMOS Voltage Controlled Oscillators (VCOs). One is Cross-coupled VCO, and the other one is Colpitts VCO. Both of them are designed with the same method. For achieving lower noise, the differential structure was used at this design. The center frequency for Cross-coupled VCO and Colpitts VCO is 5GHz. The tuning range of Cross-coupled VCO and Colpitts VCO is 1750 MHz and 230 MHz, respectively. The phase noise and the figure of merit (the FOM) for Cross-coupled VCO, are -155.5 dBc/Hz and -224.7dBc/Hz @1MHz offset frequency at an oscillation frequency of 5GHz, respectively. The phase noise and the figure of merit value of Colpitts VCO is -134.1 dBc/Hz and -200.3 dBc/Hz at the 1MHz offset from the center frequency of 5GHz. For The DC current of Cross-coupled and Colpitts VCO is 2 mA and 4 mA , respectively. Considering a 3.0 V supply Cross-coupled voltage (VCC) for both VCOs. The output power of Cross-coupled VCO is -3.94 dBm and the Colpitts VCO achieves an output power of 5.428 dBm. Agilent ADS software is used throughout this work
Robust Part Quality by Controlling the Injection Moulding Process with 24 Fraction Factorial Design: A Case Study
Authors: Rajalingam S.
Published: November 2011

The author wants to use a case study to investigate the injection moulding machine parameters which will affect the horizontal length dimension of a plastic component used in digital camera. Currently the injection moulding machine process setting caused variations in the diameter exceeding the specification limit. Therefore the experiment is needed to identify the process factors that could be set to maintain the horizontal length dimension closest to the target value and smallest possible variation. The experimental model is used to investigate four factors to identify the factors having large effect by using the Full Factorial Design of Experiment (DOE). The experiment has emphasized the use of these designs in identifying the subset of factors that are active and provide some information about the interaction.
Weighting Matrix Selection Method for LQR Design Based on a Multi-Objective Evolutionary Algorithm
Authors: Nekoui Mohammad Ali , Bozorgi Hassan Heidari Jame
Published: November 2011

This paper introduces an application of Multi-Objective Evolution Algorithm (MOEA) to design Q and R weighting matrices in Linear Quadratic regulators (LQR). Considering the difficulty of designing weighting matrices for a linear quadratic regulator, a multi-objective evolutionary algorithm based approach is proposed. The LQR weighting matrices, state feedback control rate and consequently the optimal controller are obtained by means of establishing the multi-objective optimization model of LQR weighting matrices and applying MOEA to it, which makes control system meet multiple performance indexes simultaneously. Controller of double inverted pendulum system is designed using the proposed approach. Simulation results show that it has shorter adjusting time and smaller amplitude value deviating from steady-state than a Non-dominated Sorting Genetic Algorithm LQR ( NSGA- LQR )weighting matrices design approach.
Implementation of Turntable Servo Control System Based on Fuzzy Self-Tuning PID
Authors: Wu Yan Min , Wang Jun Jie , Cui Guang Zhao , Deng Wei
Published: November 2011

The paper presents the making of driver-motor-reducer and turntable system, and builds a mathematical model of this system. The design of a self-tuning PID controller and the simulation of the whole system are realized by using the MATLAB fuzzy logic tool. The simulation results show that the turntable servo system with the fuzzy self-tuning PID controller has a slight overshoot, fast response, good accuracy and robustness etc.
Simulation Research on the Variable Step Size MPPT Control for PV System
Authors: Ling Yuan Xiao , Chuang Wang , Jun Li Shi
Published: November 2011

In Photovoltaic (PV) system, the output characteristic of PV cell is susceptible to external environment, such as temperature, light radiation etc, and showing obvious nonlinear. Therefore, in order to improve the efficiency of PV system, the maximum power point tracking (MPPT) of PV cell is essential. This paper mainly introduces the simulation of PV cell and the methods commonly used in Maximum Power Point Tracking of PV system. For the perturbation and observation (P&O) method the paper presents a new variable step size algorithm and builds a simulation model. The result shows that the proposed algorithm has a better effect on maximum power point tracking of PV cell.
The Unified Design for Inter-Area Stability Control Based on Backstepping
Authors: Xu Min , Zhu Lin , Cai Ze Xiang
Published: November 2011

This paper proposes a unified method for inter-area power oscillations which is the key to solve coordination problems caused by different mathematical models and control theories. Firstly, the unified model, breaking the constraints of the network topology, component and the precise extents in the process, is established based on global signals. Secondly, making use of the structural feature of the unified system model, it combines advanced control theory to resolve the problem of parameter uncertainty and model error. Finally, the control law is effectively derived with backstepping method. The simulation results in Matlab show the validity of the proposed method.
Systemic Design of Four Vat Energy-Saving Quenching Machine Controller
Authors: Zhang Shi Sheng , Liu Zhe , Zeng Zhao Xiang
Published: November 2011

Quenching is the technology that a metal work piece heated to propriety temperature for a while is being put into quenching medium suddenly. Quenching can improve the rigidity and abrasion resistance of metal. Making use of PLC to control quenching process, the quenching has simple technology, cheap price, stable function and convenient operation. This quenching system constitutes heating system, quenching liquid cycle system, hydraulic pressure system and electric control system. The quenching machine control system introduced in this thesis has three control modes, Manual, Auto and Try-piece designed utilized S7-PLC. This system can rise and fall worktable, clamp and relax work piece, sway forward and backwards, unload-work piece control high degree by approach-switch, produce many kinds of auto-spring plate, meet the requirement of auto-spring plate nowadays. It is presented in this thesis detailed, control-demand, element list for electric control, I/O distribute list, control LAD and improved measure for system in the end.
PXI-Based High Performance Data Acquisition System for Fuel Injection System of Diesel Engine
Authors: Song Xiao Jie , Liu Wei , Tan Bo Xue , Chen Wen Gang
Published: November 2011

Fuel supply advanced angle is one of effective parameters in monitoring the state or diagnosing the fault of diesel engine. So it is important to study fast and accurate detection method of fuel supply advanced angle. The embedded sensor is used to measure injection waveform of high-pressure fuel tube. The detection algorithm is established, and the fuel supply advanced angle is calculated by comparing the injection waveform with top dead center signal. In situ calculated advanced angle coincides with the rated parameter of diesel provided by manufacturer and verify the accuracy of the method.
Research on Transient Fuel-Film Compensation Control Strategy for a Port-Fuel-Injected Engine
Authors: Zhou Jian Hao , Yuan Yin Nan , Wu Kai , Du Jia Yi
Published: November 2011

The fuel-film evaporation model and transient fuel-film compensator model were established. By virtue of Simulink, the validity of above models were verified. The square wave perturbation method was introduced. Basing numerous calibration, the fuel-film compensation strategy including zoned compensation and damping factors ware proposed. This new strategy can compensate in-cylinder fuel fluctuation effectively during transient conditions.
The Air Controlled Hydraulic System Design of 3201z-Type Dump Truck Lifting Mechanisms
Authors: Yan Tao Ping
Published: November 2011

3201Z-type dump truck is modification desiged by EQ3208GJ dump truck chassis which the technical performance parameters are known, and using a lifting mechanism of air controlled hydraulic system. By analyzing the composition and working principle of air controlled hydraulic system and referring to similar models, the design of the tank, the limiting mechanism and power taker are conducted. By calculating the main technical parameters, including in the performances of the hydraulic cylinder and the hydraulic pump, the dump truck's special oil cylinder HG-E180X780 and gear pump CBT-E563 are selected. By the stability of the piston rod, the system pressure and cars lifting time are checked; the reasonability and safty of the design can be proved.
Human-in-the-Loop Intelligent Control System for Continuous-Flow Grain Drying
Authors: Wang Shi Jun
Published: November 2011

Moisture content is one of the key controlled variables in grain drying processes. However, this variable cannot or is difficult to be controlled accurately, due to grain drying is a nonlinear process with multi-variables and long delay. To solve this problem, the study is focused on a new intelligent control system for continuous-flow dryer. Based on the manual control idea for controlling the outlet moisture content, a nonlinear process intelligent control algorithm is presented, a human-in-the-loop intelligent control model for grain drying is developed, a system of software structure based on Visual Basic 6.0 is designed.
Combined Simulation Based Commutation Failure Analysis in HVDC Systems
Authors: Ci Wen Bin , Liu Yutian
Published: November 2011

Commutation failures may lead to serious consequences such as DC blocks. A simulation method of joint using the electromagnetic transient program and the electromechanical transient program is presented to analyze commutation failures. This method is realized in two steps. Firstly, the commutation failure critical voltage under a certain operating condition is determined with PSCAD/EMTDC. Secondly, this critical voltage is used in PSS/E, an electromechanical transient program, to analyze commutation failures of AC-DC systems. Using the proposed method, the effect of AC faults on commutation failures of a practical DC link in China is analyzed. Voltage contours is also utilized to improve the visualization of commutation failures. The combined simulation method, which gives consideration to both the simulation accuracy and the simulation efficiency, is beneficial to better analyze commutation failures of large-scale power systems.
A Novel Automated Balancing and Correcting Machine
Authors: Zhang Zhi Yuan , Li Ju Li
Published: November 2011

A novel automated balancing and correcting machine is proposed and studied. Its structure, composition and control system are introduced. A data acquisition card with USB2.0 interface is used to obtain the real-time unbalanced signal. The rotor unbalance and the mass need to be removed are calculated according to the unbalanced measurement principle. The feed which is needed to complete the correction is deduced by integration method on the basis unbalance measurement and correction principle. The AC servo motors with high precision and fast response are used to drive the rotor to achieve fast and accurate unbalance measurement and correction. A prototype according to the principle is manufactured to test the thinking. Experiments proved that the unbalance reducing rate at one time correction more than 95%. It is necessary to further industrial development.
Analysis of Fault Recorder Data for Short-Circuit Current in a 500kV Busbar Short-Circuit Accident
Authors: Cao Wei , Wang Yong Sheng , Liu Bei , Wang Wei
Published: November 2011

The three-phase short-circuit fault of the 500 kV busbar of Waigaoqiao No.2 Power Plant was described, and the fault recorder data was analyzed for short-circuit current. The RMS of short-circuit current decaying fundamental frequency component, DC component and the attenuation time constant was obtained by Fourier transform, extrapolating with the exponential function. Finally, Corresponding suggestions for grid operation and management were also proposed.
Study on Floating Raft Vibration Isolation System for Pumping Unit
Authors: Wang Fu Mao , Wang Chang Guo , Guo Lan Lan , Wen Bang Chun , Li Yong
Published: November 2011

In this paper, based on the theory of double layered vibration isolation, the finite element dynamic model of floating raft vibration isolation system has been established for the project of vibration and noise control in a heat exchange station. The dynamic model of single pump is simplified an elastic cylinder based on the principle of equivalent parameters, and the elastic raft frame is used of steel structure. The dynamic characteristics of the system is analyzed by used of ANSYS with SOLID45 unit and COMBIN14 spring-damper unit, which provide an important basis for the engineering design of floating raft isolation system with pumping units.
Distributed Flexible Strip-Type Soil Moisture Sensing and Detection System
Authors: Shi Ge , Li Qing
Published: November 2011

A distributed flexible strip-type soil moisture sensing and detection system based on the principle of parallel transmission line distribution parameter measurement is introduced. The changes of soil moisture in some regions will cause the changes of distribution impedance in the strip-type flexible strip-type parallel transmission line which buried in the soil, when a high-speed pulse signal transmit through the transmission line, and the changes of distribution impedance lead to a reflected signal of the pulse in time domain. The soil moisture around the transmission line can be measured by studying the reflected signal. The results of experiments shows, the distributed soil moisture measurement system is able to measure the soil moisture changes of any regions around the long-distance transmission lines. Through this transmission line sensor, it can realize the monitoring work of the soil moisture changes and gradient of changes on different layers or different regions, and the system is quite suitable for the early warning of geological disasters and agricultural scientific production applications.
The Method of Pole Width Modulation Reducing Cogging Torque in Permanent Magnet Motor
Authors: An Yue Jun , Zhao Wen Qiang , Xue Li Ping , Wen Hong Liang , Liu Guo Ming
Published: November 2011

Cogging torque is one of the most important parameters of permanent magnet motors, which causes torque ripple, vibration and noise. This paper describes the mechanism of cogging torque, introduces several methods of reducing cogging torque and points out the advantage of novel magnet arrayed permanent magnet motor in reducing cogging torque. Ansoft software is used to build the simulation of conventional surface-type permanent magnet motor and novel magnet arrayed permanent magnet motor and to calculate their cogging torque. a cogging torque testing system which included the angle sensor, permanent magnet motor, torque wrenches and other components are tested two different structures motors’ cogging torque .The experimental result is consistent with the simulation results, it shows that the method of novel magnet arrayed permanent magnet motor reducing cogging torque is correct. The new method compare with the same specification on the surface of permanent magnet motor can reduce more cogging torque.
Fault Feature Extraction for Gearboxes Using Empirical Mode Decomposition
Authors: Dou Chun Hong
Published: November 2011

The paper uses empirical mode decomposition to extract the fault feature of gearboxes. Traditional techniques fail to process the non-stationary and nonlinear signals. Empirical mode decomposition is a powerful tool for the non-stationary and nonlinear signal analysis and has attracted considerable attention recently. First, a simulation signal is used to measure the performance of the empirical mode decomposition method. Then, the empirical mode decomposition method is applied to analyze the signals captured from the gearbox with multiple faults and successfully extracts the multiple fault information from the collected signals. The results show that empirical mode decomposition could be a helpful method for mechanical fault feature extraction.
Development on a Test System for Starting Relays Based on IPC
Authors: Liu Zhao Feng , Yan Qiao , Zhang Yuan Guo
Published: November 2011

An industrial personal computer-based test system for starting relays is presented in this paper, its testing circuit and approaches are mainly introduced. According to the relative standards, the test system can not only measure conversional parameters of relays automatically and accurately, but also detect the performance while their contacts work though a large current. With reliable performance and simple operation, it will play a significant role in production and maintenance of vehicles.
Research on the Design of Linear Drive Motor of New Pumping Unit
Authors: Ma Wen Zhong , Zhang Hong Mei , Sun Jin Yan , Tian De Bao , Pang Hong Fei
Published: November 2011

The new energy saving pumping unit driven by linear induction motor (LIM) not only can overcome many disadvantages of traditional beam-pumping unit, but also has a lot of advantages, such as reliability, high operating efficiency, etc. So it arouses the universal concern of the oil industry. This paper focuses on the study of linear motor. Firstly, it analyzes the advantages of the pumping unit driven by LIM relative to beam-pumping unit, then in accordance with the system design requirements and based on the electromagnetic design method of linear motor, makes the theoretical calculation and the structure design of the motor, determines specific parameters of LIM, produces LIM applicable to the practical application to drive pumping unit. Lastly, makes field experiments, and experiments results show that LIM has reached the design requirements, also verify the correctness and feasibility of the design method.
Statistical Method for Rotating Machine Fault Diagnosis
Authors: Zhuang Zhe Min , Li Fen Lan
Published: November 2011

In this paper, a time-domain analysis method based on multivariate statistic is presented for wind power generation fault diagnosis. Generally, the sound and vibration signals obtained from wind power generation are time-variant since they are strongly related to the rotational speed which is not constant even in the macro steady state. Since the mostly used signal processing method, the Fourier analysis, is only suitable for stationary signals, the development of the joint time-frequency analysis is demanded. Here, Q statistic (also referred as squared prediction error, SPE) is introduced, it is used to monitor the vibration signals and three-phase currents. The control limit of the Q statistics is calculated to decide the state of the rotating machine, and the contribution plot of SPE is used to find the fault source. The method can efficiently detect faint change and the validity of the method is proved by experiments.
Design of Artificial Climate Chamber Control System for Food Crops Cultivation Based on Expert Knowledge Base
Authors: Li Zhi Hui , Liu Gang
Published: November 2011

The paper introduces a small artificial climate chamber control system based on expert knowledge, discusses the method of temperature control and parameters setting, The temperature and humidity control program can fit the expert knowledge base of different varieties of crop growth curve, consistent with the growth needs of different food crops. Taking the ganoderma lucidum as the example, the paper gives its expert knowledge base and control fitting curve. in addition, the modular design of hardware makes the whole system simple and applicable, finally, the simulation images show that this design can achieves the proper accuracy and has good effect.
Modeling of Distillation Tower Temperature Based on D-FNN
Authors: Gao Shu Zhi , Yang Jing , Fan Jun
Published: November 2011

Distillation temperature control system is characteristics of nonlinear time-varying and we use dynamic fuzzy neural network to model the temperature of distillation. Firstly, we introduce the structure and algorithm of dynamic fuzzy neural network; Second, after data preprocessing of distillation process, we use dynamic Fuzzy neural network modeling the temperature of distillation. Dynamic fuzzy neural network adopt dynamic learning algorithm, and characteristic of approximation. The simulation results show the effect and accuracy of Dynamic fuzzy neural network model ing method.
Research of Linear Differential Hall Sensor Modeling and Output Characteristics Experiment
Authors: Qiu Zhao Yun , Zhang Zong Bao , Liu Qi Tao , Jiang Guang Dong
Published: November 2011

The purpose of this paper is to model and study linear differential Hall sensor. A component for linear differential Hall sensor model was constructed, then a number of experiments were performed to check its output characteristics and temperature characteristics.Two Hall-components formed a linear differential Hall model,which had two independent outputs outputing differential voltage. The results show that the model significantly reduces quiescent output voltage, the signal amplitude increased 99.5%, sensitivity ≥ 40mV/mT, linearity error ≤ 0.5%, zero drift coefficient ≤0.023mV/°C.It is concluded that outputing differential voltage can prohibit common-mode interference and zero shift.The model will has self temperature compensation and nonlinear correctiion.In the future ,this model will practicaly in the current sensor.
Digital PID Algorithm of Navigation System for Spraying Robot
Authors: Song Jian
Published: November 2011

Electromagnetically inductive navigation system of the spraying robot is developed to meet the requirements of automatic spraying operation. The system is composed of the mechanical part, electromagnetic inductive sensor, SCM-based control system and DC electromotor PWM drive system. The mathematical model constituted by integral element and inertia element is founded with the DC servo-motor voltage as the input variable through the structural analysis of the navigation system. The increment digital PID algorithm is applied to achieve running path control of the spraying robot. Experimental results indicate that the spraying robot navigation system based on digital PID algorithm overcomes time-varying volatility, nonlinearity and strong coupling, thus has fast response speed and good robustness.
Low-Cost PLC-Based Control of a 2-DoF Purely Translational Parallel Robot
Authors: Li Zhi Bin
Published: November 2011

This paper describes the design and implementation of a low-cost robot control system based on a Programmable Logic Controller (PLC). The robot is a 2-DoF (Degrees of Freedom) purely translational mechanism, which has potential application in food and electronics industry for high speed pick-and-place operation. Combined with a conveyor belt, it can make 3-DoF purely translation motion. In this paper, the inverse kinematics, forward kinematics, singularity, and workspace analysis are presented. The control system architecture and software design is also introduced. The prototype is exhibited at last.
A Misfire Fault Diagnosis System Based on Improved Neural Network
Authors: Zhang Kai Yu , Deng Ji Wen , Lu Di
Published: November 2011

Misfiring fault is one of the common faults of automobile engines. This paper presents an algorithm based improved neural network which is used for misfiring fault. It calculates the memberships of inputs and initializes the weights and thresholds of the neural network by genetic algorithm firstly, and then trains the improved neural network and uses it for diagnosis. By applying GUI function of MATLAB, a new man-machine interaction interface was designed. The results of experiment indicate that this algorithm can effectively carry out misfiring fault diagnosis.