bluuebunny/crossref_metadata_2025 huggingface dataset:
Scheduling Problem for Parallel Machines with Limited Processing Capacities
Authors: Fan Jing
Published: November 2011

In the actual industrial engineering, machines used for processing need to be checked periodically to ensure that they can work efficiently. Thus, the novel scheduling problem for parallel machines with limited capacities is worth to study. The objective function is to maximize the last completion time of jobs. We show the problem is NP-hard at least. Furthermore, two approximation algorithms are presented, and algorithms' performances are considered through the experiments with large amounts of data.
Simulation and Analysis of Cooling Load about Building Construction
Authors: Zheng Hui Fan , Zhu Cai Xia , He Da Si
Published: November 2011

Combined with an independent residential construction, using cooling load coefficient method based on the DEST software, the hourly cooling load calculation program is established, the hourly cooling load is calculated, and the distribution character of cooling load is analyzed. It can be concluded that the maximum cooling load appears in the afternoon between 14:00 to 16:00. In refrigeration seasons, the number of days whose maximum daily cooling load ranged from 40 to 50 W/m2 in summer is the most; however, the number of the ones whose peak value beyond 80 W/m2 is only 9 days. So the cooling load distribution indicates that the ratio of load operating is about more than 75 percent.
Dynamics Simulation for Horizontal-Axis Wind Turbines
Authors: Mao Xu Ning , Li Ji Shun , Liu Yi
Published: November 2011

In this study, the dynamic characteristics of three-blade horizontal¬-axis wind turbines were simulated, based on the aerodynamic software AeroDyn, wind turbine design software FAST and mechanical dynamics simulation software ADAMS. AeroDyn and FAST are Interface codes for ADAMS. As the pre-processor of ADAMS, FAST code helps to build wind turbine model as well as constrains ,while AeroDyn code applies wind field data to the model. At last the model was imported into ADAMS to be simulated. In this way, the dynamic operating characteristics of three-blade horizontal¬-axis wind turbines can be obtained. And the load-time curves of the blade roots can also be gotten. Results show that the method adopted is feasible and reliable.
Standard Uncertainty of Rolling Bearing Vibration as Time Series
Authors: Xia Xin Tao , Gao Lei Lei , Sun Xiao Chao
Published: November 2011

The standard uncertainty in the measurement theory is applied to evaluate the change of the rolling bearing vibration acceleration generated by the failure on the surface of the ring raceway. The time series are obtained via the experimental investigation on the vibrational acceleration of the rolling bearings with different failure diameters. And the result shows that the standard uncertainty of the vibrational acceleration increases nonlinearly with the failure diameter, revealing a new characteristic of the variation of the rolling bearing failure process. It follows that for a rolling bearing in running, the failure process can be described by the standard uncertainty of its vibration acceleration, laying a foundation for failure warning of a rolling bearing.
Performance Research of Resistance Materials of Low Resistance Grounding Resistor under the Short-Circuit State
Authors: He Da Jiang , Yang Heng Ling , Xiao Jing , Qu Jun , Liu Liang Yuan
Published: November 2011

The through-flow experiment in the simulated state of earth fault of various alloy materials were done, the variable parameters of resistivity were obtained. In the paper,the characteristics and its variational causes of alloy materials resistivity in the state of earth fault were analyzed. At the same time, the choice principle of resistance material, which can be used in Low resistance grounding resistor, is presented. The research results are useful for the design of Low resistance grounding resistor.
Motor Broken-Bar Fault Diagnosis Based on Park Vector and Wavelet Neural Network
Authors: Zhang Qing Xin , Li Jin , Li Hai Bin , Liu Chong
Published: November 2011

In the technology of motor fault diagnosis, current monitoring methods have become a new trend in motor fault diagnosis. This paper presents a motor fault diagnosis method based on Park vector and wavelet neural network. This method uses the stator current as the object of study. Firstly, it uses Park vector to deal with the stator current and filter out fundamental frequency component, thus the characteristics component of motor broken-bar will be separated from fundamental frequency component; Secondly, it uses five layers wavelet packet decomposition to pick up fault characteristic signal; Finally, we distinguish the fault by BP neural network, and use the simulation software of MATLAB to realize it. The test results show that: This method can detect the existence of motor broken-bar fault, and has a good value in engineering.
Design of Pt100 Temperature Measuring System Based on System-on-Chip for C8051F410
Authors: Liu Qi , Ai Xue Zhong , Wang Ying , Liu Ren Yu
Published: November 2011

In order to reduce development costs, improve system stability and reliability, we designed high precise temperature measuring system with system-on-chip of C8051F410 as control core, using three wire constant current sources to drive Pt100 temperature sensor. The Operational principle and design basis of current source, signal conditioning and modulus convert circuits are analyzed, and also given circuit structure and circuit parameters. Experimental results show that absolute error is less than 0.15°C and accuracy level is 0.02 that can achieve real-time measure with high precisions in -50°C ~ 500°C range.
Analysis of Rod Length Change in the Rapier Weft Insertion Mechanism Transmitted by Spatial Four Bars
Authors: Xu Yong Kang , Zhang Lei , Pan Xiao Ye , Xu Shi Fu , Wang Bo Hong
Published: November 2011

In order to analysis kinematics characteristic of space four bar linkage weft insertion mechanism and the influence on movement law by connecting rod length change, mathematical models of every parts of the mechanism were proposed by the method of analysis, and through MATLAB programming, motion curves were obtained. The length range of connecting rod and rocker, and the impact of changes in length were also studied, and some corresponding conclusions were drawn. The motion characteristic curve of it has been in accord with the weft inserting requirements. The study of kinematics, especially the discussion of connecting rod length changes will pave the way for the further study of dynamics.
Analysis of the Influence of Long Curing Age on the Compressive Strength of Plastic Concrete
Authors: Hu Liang Ming , Gao Dan Ying , Li Yi Zhi , Song Shuai Qi
Published: November 2011

Plastic concrete is a composite material between the normal concrete and clay, with its characteristics of long curing age and slowed growth of strength. In this paper, the mathematical models of relationship between compressive strength (curing age of 540 days) and curing age (28 and 90 days) are established on the basis of multitudinous of tests. Comparing the value obtained by calculating model with experimental value, we find that they have well consistency. The establishment of these models provide the basis for making plastic concrete standard procedures and carrying out numerical analysis, and they also offer reference for engineering application of plastic concrete.
Estimation of Eddy-Current Loss for MnZn Ferrite Cores
Authors: Nien Hsiau Hsian , Huang Chuan Kuei , Wang Ming Yu , Lin Chih Wei , Changchien Shih Kuen
Published: November 2011

This paper proposes a new estimation for the eddy-current loss of MnZn ferrite cores. The eddy-current loss plays a critical role in the frequency range of 100-500 kHz, whereas the amount of the hysteresis loss dominates the core loss of magnetic devices below 100 kHz. However, the definition and calculation of eddy-current loss are not as easy or accurate. In the proposed estimation, the equivalent electrical circuit method is conducted for determining the grain conductivity and the driving current to replace the induced magnetic flux density in order to simplify measurement. The related electrical and magnetic characteristics are measured by an HP-4294 impedance analyzer. Finally, an EI30 (PC40 material system from TDK) MnZn ferrite core is used as an example to prove that this model can effectively estimate the eddy-current loss of MnZn ferrite cores at different frequencies and driving currents
Deformation Analysis of Damage Region on Dynamic Spherical Cavity Expansion Problem
Authors: Yu Xue Mei , Cheng Wei , Wu Shuang
Published: November 2011

The deformation of dynamic damage in a pressure-sensitivity media was investigated by means of spherical cavity expansion model. By constructing a three region model of spherical cavity, dynamic solutions with damage and elastic area was investigated when distortion was so small that no plastic area arisen (cavity expansion rate is generally less than 0.4). Firstly, by elastic and damage mechanics, the continuous conditions in the damage region were given. Secondly, the governing equations and analytical solutions of the damage region were deduced. Finally, numerical solutions were obtained by shooting method. The result shows that some material parameters such as damage index and Poisson ratio have significant effects on the range and field quantities of damage region.
Dynamic Rheology and Thermal Stability of PTT/POE-g-MAH Blends
Authors: Run Ming Tao , Liu Feng , Jiang Chun Yan , Li Na
Published: November 2011

The blends of poly (trimethylene terephthalate)(PTT) and maleinized poly (octene-ethylene) copolymer (POE-MAH) were prepared by melt-blending method and their rheology and thermal stability were investigated by using rotational rheometer and thermalgravimetric analyzer (TGA) respectively. The rheological properties of PTT/POE-MAH blends demonstrate that all of the blends belong to the pseudoplastic fluid for their complex viscosity declines with the increasing shear rate. In addition, POE component can strengthen the melt viscosity, so the blend can be processed in the more wider temperature range. Moreover, the complex viscosity become more sensitive to the change of the shear rate, i.e., it decreases more apparently with the increase of the POE-MAH component. The melt flexibility increases apparently with the increase of the POE-g-MAH component. POE-MAH component only has a little depression on the thermal stability of the blends.
Thermal Decomposition of Wood Treated with K2CO3 and Melamine Modified Phenolic Resin by Thermogravimetry–Mass Spectrometry
Authors: Wu Wei Hong , Ye Xia , Li Zhi , Liu Ning
Published: November 2011

The flame retardancy of the wood samples treated with K2CO3, melamine modified phenolic resin (MMPR), and their mixture of K2CO3/MMPR was studied with the limiting oxygen index (LOI) method. The thermal degradation process and the composition of the products in gas phase were determined by the thermogravimetry–mass spectrometry (TG–MS) analysis methods. The results showed that the K2CO3 accelerates the dehydration reaction of wood and promote the formation of more H2O, CO2, and char residue, while MMPR can act as the thermal barrier during the combustion of the samples. When the wood sample treated with K2CO3/MMPR, there are the catalysis of K2CO3 and the adiabatic effect of MMPR make the samples have better flame retardancy.
Electropolymerization of a Pyrrole Film in Supercritical CO2/BMIMPF6 Biphase System
Authors: Xu Fei Fei , Wang Wen Min , Li Zhang Lin , Yan Hao
Published: November 2011

Polypyrrole (PPyr) film was synthesized in a supercritic al carbon dioxide ( ScCO2 ) / ionic liquid biphase system with electrochemicalmethod for the first time. The PPyr films synthesized in the ScCO2 / ionic liquid biphase system have smooth and uniform surface better than that obtained from pure ionic liquid. As the pressure of carbon dioxide is increased, the film growth rate is decreased and the film surface becomes more smooth and uniform.
Checking Analysis of Lining Structural Strength in Aeolian Sand Tunnel
Authors: Qiu Yu Liang , Zhang Xiao Xu , Shi Bao Tong , Huang Rui , Zhang Qing Xia
Published: November 2011

The crushing and loosening arised from the characteristics such as single particle, bad gradation, lacking of self-stability, low cohesion, loose structure and shear strength happen frequently in the aeolian sand formation. These characteristics lead to tremendous difficulty for tunnel's design and construction. Loading such as formation pressure must be undertaken by secondary lining. In this paper, relying on Shen-Mu Tunnel of Yu-Shen expressway, the strength of lining section has been checked according to internal force combination through imitating the interaction of rock and lining by applying elastic resistance. The bearing force of secondary lining in aeolian sand tunnel has been discussed through calculation by ANSYS, which plays an important directive role on the construction process and keeps the project going on well.
Research on Grouting Experiment in Aeolian Sand Tunnel
Authors: Qiu Yu Liang , Zheng Wan Kun , Shi Bao Tong , Huang Rui
Published: November 2011

Portland cement, superfine cement and modified sodium silicate have been taken as grouting materials in the aeolian sand tunnel which is characterized by single particle, bad gradation and loose structure. In this paper, penetration grouting and rotary jet grouting have been adopted in site grouting experiment, whose effects are tested by excavation sampling test and field excavation detection. The grouting feature of aeolian sand formation has been revealed. In the meantime, the applicability of different kinds of grouting materials in aeolian sand tunnel have been clarified which provides useful significance and reference value on the selection of grouting parameter and construction in aeolian sand tunnel.
Dynamic Modeling of Surface Subsidence Induced by Underground Mining
Authors: Han Hao Liang , Hu Nai Lian , Cui Bo
Published: November 2011

A new time function was proposed to cover the disadvantage of knothe time function in predicting surface subsidence by adding parameter k. The velocity and acceleration of the progressive surface subsidence obtained from this new time function were compared with actual subsidence data from an iron mine in China. Combining this new time function with section function of surface subsidence basin, a dynamic mode was proposed to predict surface subsidence induced by underground mining and a case study based on this model was carried out. It shows that this model accurately represents the actual subsidence pattern observed. Instruction
An Improved Risk Analysis Method of Advanced Materials
Authors: Liu An Ying , Wei Fa Jie
Published: November 2011

Most new materials are not mature since there are all kinds of uncertainties due to many factors, such as technical complexity, shifting objectives/scopes, and poor management. Application of a new material means we must accept all opportunities and threats, while it exists a lot of uncertain information in the process of decision making. This paper reviews the traditional methods of risk analysis, such as risk matrix, and introduces uncertain data in decision to describe two attributes of risk —probability and consequence. The data of risk collected is then processed based on prospect theory, take into account the behavior patterns and psychological factors which are not aware of in a traditional approach. At last, an example proves the improved risk analysis method is rational and scientific.
Calcination Conditions Influencing the Preparation of Porous TiO2 Film Using PEG1000 as Template
Authors: Zhang Wen Jie , Yang Bo , He Hong Bo
Published: November 2011

TiO2 porous film was dip-coated on glass substrate by sol-gel process using PEG1000 as template. The influences of calcination temperature and time were investigated. The absorption edges of the films calcinated at different temperatures have no obvious change, but the transmittances of the films can be affected. Methyl orange degradation rates are 30.1%, 33.8% and 38.3% on the films prepared at 450 oC, 480 oC, and 500 oC, respectively. The film calcinated at 500 oC for 2 h has the highest transmittance and the highest activity on methyl orange degradation, while the films calcinated for less or more than 2 h have much lower activities. After 30 min of irradiation, 38.3% of the initial methyl orange in the solution can be degraded on the porous TiO2 film calcinated at 500 oC for 2 h.
Porous TiO2 Films Prepared by Sol-Gel Method Using Different Kinds of Templates
Authors: Zhang Wen Jie , Yang Bo , He Hong Bo
Published: November 2011

Porous TiO2 films were prepared through dip-coating on glass substrates using several different templates. Dip-coating process was optimized to prepare the three layered films. The film prepared with PEG1000 has the maximum activity compared with the other films using CTAB and HST. While PEG molecular weight is in the range from 400 to 6000, methyl orange degradation rate reaches its maximal value when using PEG1000. Two comparatively high activities can be found at the ratios of PEG1000:PEG400 as 3:1 and 1:2. The 1:2 ratio is the optimal one. PEG1000 seems to be more suitable of being used as a template to prepare porous TiO2 film with high photocatalytic activity. After 200 min of irradiation, 98.6 % of the initial dye can be degraded on the film prepared using 2 g of PEG1000.
A Single Roll Caster for Aluminum Alloy Strip
Authors: Haga Toshio , Akitsu Kazuya , Kumai Shinji , Watari Hisaki
Published: November 2011

Single roll caster to cast strip with sound free solidified surface was invented. A scraper was attached to the single roll caster to improve the free solidified surface. AA5182 and AA6022 strips were cast using the single roll caster equipped with the scraper. Mechanical properties of the strip were investigated by tension test, bending test and deep drawing. Mechanical properties of the strip cast by the single roll caster were as same as those made by DC casting.
Effect of Hydrothermal Process on Xonotlite Crystal
Authors: Liu Fei , Wang Xiao Dan , Cao Jian Xin
Published: November 2011

Effect of hydrothermal process on xonotlite crystal prepared from K2SiO3 and H2SiO3 respectively in CaO-SiO2-H2O system was researched in this paper. The crystal phase composition and morphology of the xonotlite crystal were analyzed using XRD and techniques. The results indicate that different hydrothermal process poses significant impact on the microstructure of xonotlite crystal. The xonotlite spherical particle with the diameter of 10-20 µm was prepared from H2SiO3 only via dynamic hydrothermal process. The xonotlite whisker prepared from K2SiO3 with the length of 20-40 μm, diameter of 400 nm and the aspect ratio of 50-100 was successfully prepared from K2SiO3 via dynamic hydrothermal process, while with the length of 5-10 μm, diameter of 500 nm and the aspect ratio of 10-20 via static hydrothermal process.
Effect of pH in Systems on Crystallinity and Morphology of Synthesized Xonotlite Whiskers
Authors: Liu Fei , Wang Xiao Dan , Cao Jian Xin
Published: November 2011

The different pH values in CaO-SiO2-H2O systems were taken into account to prepare xonotlite whiskers without any surfactant, special instruments and synthesis conditions. Effect of pH values in system on the crystallinity and morphology of synthesized xonotlite whiskers was studied by using XRD and SEM techniques. The results indicated that the different pH values in system had little effect on the crystallinity of synthesized xonotlite, but posed significant impact on the morphology of xonotlite whiskers. The higher pH value is, the lager scale xonotlite whiskers appear. Little whiskers were synthesized in the system of pH 11.5, but in the system of pH 13.0, the formation of xonotlite whiskers was promoted and xonotlite whiskers with 20-40 μm in length and 400 nm in diameter were prepared at 225 °C for 15 h.
Influence of Material Systems on Synthesized Xonotlite Whiskers
Authors: Liu Fei , Wang Xiao Dan , Cao Jian Xin
Published: November 2011

The material systems were taken into account to prepare xonotlite whiskers without any surfactant, special instruments and synthesis conditions. Effect of material systems on the crystal phase and morphology of synthesized xonotlite whiskers was studied by using XRD and SEM techniques. The results indicated that the different material systems had great impact on the crystal phase and morphology of synthesized product. The xonotlite crystal could be formed both in C-S-H and C-S-K-H systems, while the formation of xonotlite whiskers was promoted and the large scale whiskers were prepared at 225 °C for 15 h only in C-S-K-H system. In the C-S-N-H system, the synthesized product was pectolite but xonotlite.
Resistance to Nitric Acid Corrosion of Latex Modified Sulphoaluminate Cement Mortar
Authors: Hua Wei Dong , Jiang Hong Yi , Zhou Zi Xia
Published: November 2011

The correlation performance between polymer/cement ratio and corrosion resistance to nitric acid of latex modified sulphoaluminate (SA) cement mortar was investigated by testing the compressive strength, flexural strength and weight change rate of latex modified SA cement mortar in the nitric acid solution at different ages. In addition, considering the appearance of the specimen, the results show that the corrosion resistance to nitric acid of latex modified SA cement mortar is influenced positively by the polymer/cement ratio. With the ratio of emulsion to cement increasing, the corrosion resistance to nitric acid was enhancement. when the polymer/cement ratio was 0.2, the latex modified SA cement mortar showed the best performance in compressive strength, flexural strength, weight change rate and the appearance.
Water Lubricated Bearing Molding Technology Impact on Bearing Bush Material Performance
Authors: Peng Jin Min
Published: November 2011

Water lubricated plastic alloy bearing molding technology determines the mechanical properties and performance of the product. The influence of molding temperature and time are significant on the performance of water lubricated bearing. The experiment selected five vulcanization temperatures from 110°C-190°C, and five time points from 5-25min to assess their influence on the tensile strength, stretching strength and abradability of bearing material. The corelation between temperature and time is analyzed and a vulcanization curve of plastic alloy production in the situation of 170°C (vulcanization temperature), 2Mpa (vulcanization pressure). The curve realizes a long vulcanization induction period at a fast vulcanization speed with a broad vulcanization plateau that reduces the vulcanization time in the production process and enhances efficiency massively.
Study on Material Tracking and Auto Coiling Sequence of the Coilbox
Authors: Cui Dong Yan , Xie Zai Xing
Published: November 2011

In this paper, we discussed the principle of material tracking and auto coiling sequence of the coilbox. The maths model of coiling master speed is built, It provides the reference for optimization and adjustment of Control parameters in the production process .
The Deformation and Failure Mechanism of the Excavation Damage Soil Slope under the Action of Seismic Load
Authors: Fayou A. , Kong Ji Ming , Ni Zhen Qiang
Published: November 2011

Wenchuan earthquak induced a large number of mountain hazards. Through the survey found that manual excavation slopes tend to become concentrated area of mountain disaster, it’s indicate that the effect of excavation damage on the slope deformation and failure under seismic load is very obvious. Soil slope deformation as one types of mountain hazards induced by Wenchuan earthquake, and it’s also seriously affected by excavation damage. In this paper, as Shui Caoping landslide for example, using the finite element method to simulate the landslide and analysis the overall stability and the local deformation and failure of slope affected by the excavation damage. Analysis shows that the local damage is significantly induced by excavation, and resulting in vertical stress and plastic strain increased in the local of slope near the excavation face. While excavating also has the role of unloading. The results basic agreement with the characteristics of the slope deformation and failure induced by Wenchuan earthquake.
Effect of Galaeto-Oligosaccharide and Isomalto-Oligosaccharide on Growth of Selected Probiotics
Authors: Chen He , Ji Li Yuan , Shu Guo Wei , Li Chuan Na
Published: November 2011

Effect of Galaeto-oligosaccharide (GOS) and Isomalto-oligosaccharide (IMO) on growth of Lactobacillus acidophilus, Bifidobacterium longum and L. rhamnosus was studied. The addition of each substance (w/v) was 0.0%, 0.1%, 0.5%, 1.0% 1.5% and 2.0%.The methods were analyzed titratable acidity (°T), pH and enumeration that using reconstituted skim goat milk media as the control. All samples were incubated at 37 C for 18h. Results were as follows: addition of GOS has the significant inhibition on the growth of L. acidophilus and promotion on the growth of L. rhamnosus, while the effect on the growth of B. longum was not obviously. Addition of IMO could promote the growth of L. acidophilus, especially in low level. The growth of B. longum was increased with increase in IMO. While the effect on the growth of L. rhamnosus by adding IMO was inhibited and obviously in the high concentration.
Effect of Fructo-Oligosaccharide, Isomalto-Oligosaccharide, Inulin and Xylo-Oligosaccharide on Survival of B. Bifidum during Freeze-Drying
Authors: Shu Guo Wei , Hu Man , Qin Tao , Chen He , Ma Qi
Published: November 2011

Four different prebiotics including fructo-oligosaccharide isomalto-oligosaccharide, inulin and xylo-oligosaccharide were screened for their effects on survival of Bifidobacterium bifidum during freeze-drying. The additions of prebiotics (v/v) were all 4%, 8%, 12%, 16% and 20%. The results showed that prebiotics could act on Bifidobacterium Bifidum. The optimum concentration of fructo-oligosaccharides (FOS) in samples for surival of Bifidobacterium bifidum was 12% and for viable count was 20％. Addition of xylo-oligosaccharides (XOS) played a significant role in promoting cell viablity when it was in low level. The optimum concentration of isomalto-oligosaccharides (IMO) for surival of Bifidobacterium bifidum was 16% and for viable count was 12％, while inulin in samples for surival and viable cell of Bifidobacterium bifidum both was 4％.
Effects of Busulfan on Serum Steroid Hormones, GSI, Gonad Development and Sex Reversal in the Asian Swamp Eel (Monoptrus Albus)
Authors: Yuan Han Wen , Ruan Guo Liang , Gong Shi Yuan , Yuan Yong Chao , Yu Deng Hang , Yang Dai Qin
Published: November 2011

This study investigated the effects of busulfan on sex reversal in the Asian swamp eel (Monopterus albus) by evaluating the estradiol (E2) and testosterone (T) concentrations, gonadosomatic index (GSI) and sex ratio. Fish (9.80 ± 1.07 g average initial weight; n = 3 per group) were fed with five diets containing 0 (control), 10, 30, 50 or 70 mg kg-1 dietary busulfan concentrations to apparent satiation for 15 months. Serum E2 and T concentrations were determined by radioimmunoassay techniques. Both E2 and T concentrations were significantly affected by busulfan, while there were no significant differences among the treated groups. Serum E2 concentrations and GSIs decreased, while T concentrations increased with increasing busulfan levels in each group. A shift in the sex ratio towards more male and intersex fish was observed with increasing busulfan contents. The highest male ratio obtained in the 70 mg kg-1 group was significantly different compared to the other groups. High doses of busulfan may induce deformed individuals and high mortality in M. albus. Therefore, busulfan may inhibit gonad development and promote the sex change from female to male M. albus.
Analysis on Fluid-Structure Interaction Dynamic Characteristics of Steam Generator Heat Exchanger Tubes
Authors: Zhang Li Na , Wang Su Zhen
Published: November 2011

The fluid-structure interaction (FSI) dynamic characteristics of steam generator tubes counting for much with safety of an operating nuclear power plants are investigated by analytical methods based on dynamics mechanics and FSI theories. By using the parametric design language APDL of finite element program ANSYS, intelligently dividing model, setting up material and geometric parameters, the models of tubes with internal and external fluid, the different factors influencing on fluid-structure interaction dynamic characteristics of steam generator tubes are investigated by numerical method.
The Integrated Evaluation Index of Energy-Saving and Emission Reduction Generation Dispatching
Authors: Li Yong Hua , Wang Jun , Yan Wei Ping
Published: November 2011

In China, coal combustion to generate electric power is the primary method, the energy-saving and emission reduction is the urgent task. At present, the energy-saving dispatching trial method in some area evaluates energy-saving and emission reduction of coal combustion power generation according to power supply coal consumption rate only. But the power supply coal consumption rate can’t reflect the energy-saving and emission reduction effect of coal combustion power plant overall. For example, the same coal combustion unit, the coal consumption rate is difference when desulfuration system is operating or not; the coal consumption rate of the unit with SCR will be increased; the coal consumption rate of the air-cooled unit is higher than water-cooled unit; etc.. This paper considers synthetically coal consumption rate, pollution emission, water resource wastage, etc., establishes a integrated evaluation system, adopts factor analysis method, gets the integrated evaluation system and index of energy-saving and emission reduction of coal combustion power generation, evaluates energy-saving and emission reduction effect of 5 power plants reasonable. The results show that the index can reflect the energy-saving and emission reduction level of coal combustion power generation.
A Heuristic Calculation Method for Concrete Building Construction Cost Base on Structural and Material Characteristics
Authors: Dong Jin , Wei Fa Jie
Published: November 2011

At present, China's construction cost management lags far behind foreign countries, especially in the study on structural and material characteristics of construction. Based on Radial basis function neural network nonlinear model, the paper selected ordinary commercial civil engineering data of concrete building construction in the 2003-2007 years as samples, chose structural and material characteristics as cost indicators and estimated the cost prices. The results show that the method meets the requirements in the precision. Compared with other methods, it has the advantage of speed and generalization ability. The method provides project managers a better basis for decision making.
Applying a Modified Particle Swarm Optimizer to Section Optimization of Steel Framed Structures
Authors: Yang Bin , Zhang Qi Lin
Published: November 2011

As a new paradigm of Swarm Intelligence which is inspired by concepts from ’Social Psychology’ and ’Artificial Life’, the Particle Swarm Optimization (PSO), it is widely applied to various kinds of optimization problems especially of nonlinear, non-differentiable or non-convex types. In this paper, a modified guaranteed converged particle swarm algorithm (MGCPSO) is proposed in this paper, which is inspired by guaranteed converged particle swarm algorithm (GCPSO) proposed by von den Bergh. The section sizing optimization problem of steel framed structure subjected to various constraints based on Chinese Design Code are selected to illustrate the performance of the presented optimization algorithm.
A Study on the Characteristics of Planar Motor with Halbach Array
Authors: Huang Rui , Wu Shi Hong , Sui Hai , Jiang Feng Li , Hu Bo
Published: November 2011

A synchronous permanent magnet planar motor (SPMPM) with Halbach array is proposed. The flux density distribution of Halbach array is obtained by analytical method; then, the characteristics of SPMPM with Halbach magnet array are evaluated. At last, the experiment results are used to verify the analysis propriety of this SPMPM. By comparison, it can be concluded that the analysis of SPMPM with Halbach magnet array is credible and feasible.
Stability Analysis of Beam’s Non-Linear Vibration with Time-Delay Feedback Control
Authors: Liu Can Chang , Zhang Dong Huan
Published: November 2011

The stability control domain of beam’s non-linear vibration with time-delay feedback controller was investigated. The non-linear dynamic equation of beam was expanded into a series of linear equations by multi-scales method. The equations of the phase trajectory could be gotten from secular terms. The conditions of the negative real roots could be calculated by the method of Routh-Hurwitz. The stable time-delay domain of beam’s non-linear vibration was given.
Contour Extraction of Flame for Fire Detection
Authors: Yan Yun Yang , Gao Shang Bing , Wang Hong Yan , Guo Zhi Bo
Published: November 2011

Fire detection based on sequences of images is more suitable for the need in big room or badly environment. Color and contour are both the important features of a flame image. The method to extract the contour feature of a flame image is developed based on threshold of flame area. The edges of the burning flames jitter continuously, but their contour are similar each other. The method to detect flames in video sequences is proposed here based on flame’s dynamic contour. Many experiments show that the system is able to work well and get high detection rate with a low false positive rate.
Influences of Clearance in the Nether Wearing Ring on the Self-Excited Vibration of the Francis Turbine
Authors: Zhao Dao Li , Liang Wu Ke , Nan Hai Peng , Ma Wei , Li Jin Bo , Li Tao Tao
Published: November 2011

Aimed at the self-excited vibration of caused by unreasonable clearance in wearing ring of the Francis turbine, whole flow passage of prototype hydraulic turbine which contains the clearance in wearing ring is numerically calculated by computational fluid dynamics software CFX based on N-S equation and RNG k-turbulence model. The result shows that the flow field in front of inlet of runner is unstable extremely, even if a tiny disturbance effects on, which will be out-of-balance symmetrically in the radial direction, then the force of runner will be unbalance, which will cause vibration of the hydraulic turbine. As well as, a reasonable clearance in wearing ring of the Francis turbine will reduce the impact of the water in the inlet of the clearance, and self-excited vibration of the hydraulic turbine will eliminate.
Navigation System of Mobile Platform Based on Open Architecture for Agricultural Machinery
Authors: Song Jian
Published: November 2011

In order to meet the requirements of agricultural production automation, a PC-based opening navigation system for agricultural machinery is designed, which is composed of PC, data acquisition cards, electromagnetic induction sensors, high-frequency electromagnetic generator, DC servo motor and mechanical part. The track of the mobile platform is led by a wire with high-frequency currents laid under the field. The position can be determined by a pair of electromagnetic induction sensors installed in the machine. The traveling path is planed by computer according to information of electromagnetic induction sensor and automatic walking of agricultural machinery is achieved. Based on Visual C + + 6.0 platform, a system software is developed and human-computer interface with good interaction is designed. The results show that, straight navigation accuracy is ± 1.5cm within 10m; the navigation accuracy is ± 3cm when the turning radius is 0.5m. Experiments explain that the system owns high real-time performance and dependability, and that it has a good application prospect.
Electromechanical Actuator Controller Design with Optical Encoder Feedback
Authors: Liu Xiao Ming , Chen Wan Chun , Yin Xing Liang , Xing Xiao Lan
Published: November 2011

In this paper we propose a control scheme of electromechanical actuator with optical encoder feedback. Controlled object is the simplified model of a DC motor while feedback device is an optical encoder. Encoder model is established after analyzing its principle and signal characteristic. Many velocity estimation methods have been compared and the least squares fit filter is selected for our design because of its simple algorithm and capability of predicting velocity and position. Using these predictions as feedback, a variable structure controller based on exponential approach law is adopted in the actuator close-loop control. The relationship between system performance and encoder resolution is exposed. This scheme can be implemented easily with low cost and convenient interface. Its validity is proved by simulation results.
Study on Assessment Model of Lightning Proof Abilities of HV Transmission Line Based on ArcGIS
Authors: Lai Guo Fang , Ji Yan Fei , Gu Zhi Peng , Liu Gang
Published: November 2011

With the rapid growth of the national economy, the demand for electricity is increasing rapidly. In order to ensure electric power system operates safely and stably, much attention has been paid to insulation condition and lightning proof abilities of HV transmission lines. Nowadays the study of lightning protection of transmission line, which takes districts as the research object, has certain limitations. To provide a more rational basis for insulation design of the new transmission lines as well as insulation improvement in the old, this paper brings in a new analysis method based on ArcGIS. It is also taking the environmental factors, such as landscape along the transmission lines, into consideration. This method first filters and statistically analyzes lightning location data, and establishes assessment model of lightning proof abilities of transmission lines, which can serve as reference for finding the segment struck by lightning. In order to verify the feasibility of the model, this paper took a 220kV transmission line of a region in the Pearl River Delta as an example, and analyzed the distribution of parameters of lightning activities for the past decade. The result shows that the segments where flashover trip occurred have great relevance with the results of the data analysis. It is true that the model can be provided as a reference to the improvement of the insulation level of lines.
Research of Video Tracking Algorithm Based on the Blob Analysis
Authors: Zhang Zeng Ping , Li Shu Hua
Published: November 2011

To the video that contains the target, a method is proposed to create the background model based on the mixed Gauss. And the target locating method based on the blob analysis and blob filtering, the anti-noise ability and filter robustness of tracking is improved. The kalman filter and the particle filter are separately used to pass and update the foreground target’s posterior probability distribution. Finally the kalman filter and the particle filter's are compared and that builds the foundation of the further development.
The CAD/CAM of Hydraulic Valve Block Based on Pro/Engineer
Authors: Wu Wen Liang , Jin Xia Jie , Xing Ke Li
Published: November 2011

This paper uses the Pro/E software for 3D solid modeling and use its Pro/NC module automatically generated NC code of valve block, and communication with CNC machining centers and data transmission to achieve CAD/CAM integration purposes.
Design of Automated Distillation Analyzer Based on STM32
Authors: Chen Wen Gang , Song Xiao Jie , Liu Wei
Published: November 2011

Aiming to solve the problems of inaccuracy in temperature control and the slow reaction in condensing system in the automated distillation analyzer, an approach which combining electrical fan and thermoelectric cooler was put forward, using STM32 as the control unit; accurate temperature control during the distillation process was realized, data collection and processing can be completed by the control unit, and the wireless module can accomplish communication and control the analyzer under the instructions of computer. With this temperature control method, the automation and test accuracy of distillation analyzer can be enhanced, thus ensuring better ratio of performance-to-price and control performance.
Seal System Optimization Study of an On-Off Valve Based on CFD
Authors: Hu Xiao Dong , Gong Quan Shuai , Gong Li Xiao , Lv Jian Tao
Published: November 2011

According to the phenomena of regular grooves on the face of seal gasket which causes the hundreds of gaskets irrational failure in the valves of pressure-swing absorption (PSA) for CO refinement in a cathay coal chemical CO.LTD, the method of computational fluid dynamics (CFD) has been used to analyze the fluid dynamical performances of the mixed gas flowing in the pipe system of the PSA to study the reasons of the irrational failure of the seal gasket. Conclusions have been obtained as following: the main reason of Teflon seal local inactivation is the irrational seal system structure which causes the local high-velocity over the face; a rational modified scheme has been offered; the method which can be used to analyze similar problem has been explored in this paper.
Research on Auto Control System for Ship Loader Based on AC800M
Authors: Liu Wei , Xue Shi Long
Published: November 2011

Ship loader is one of the most key equipments for bulk material handing in bulk port. This paper regards the ship loader as the study object, introduces an auto detection technology of cabin position and material distribution, and advances a new control measure for automation loading. The field-bus technology of Profibus, AC800M series PLC, inverter, encoder was adopted to build automatic control system. In the mean time, the control code and the ship loader Management System, which is written in Control Builder for AC800M and Visual Basic independently, are used to actual ship loading process without people.
Motor Position Detection Unit for Servo Control Application
Authors: Song Shu Zhong , Shi Jing Zhuo
Published: November 2011

Rotor position detection is important for motor servo system design. In general, there are two kinds of methods to obtain the position information in real time, sensor or sensorless methods. The sensor methods use position sensors such as optical encoder. This will greatly increase the cost of the system, and the sensor with high precision is difficult to be installed. On the other hand, the sensorless method can reduce the cost, but the reliability and complexity of the algorithm is still the problems. In this paper, a new low-cost integrated position detection unit, which is composed of the integrated position sensor, signal processing hardware and software, is described. The sensor is easy to manufacture and has better precision with the help of signal processing circuit and software based on DSP. The sensor can obtain absolute rotating angle using inductance detection method, and it is originally designed and used for a 2-phase hybrid stepping motor position servo system. Even though the feedback unit is originally designed for a 2-phase hybrid stepping motor, the same unit also can be used with other types of motors.
Key Establishment Scheme for Distribution Automation System Using Logical Key Hierarchy Approach
Authors: Sun Zhong Wei , Zhang Rong Gang , Liu Dan
Published: November 2011

Ethernet Passive Optical Networks (EPONs) are promising communication technologies for distribution automation system (DAS). However, EPONs have very specific security requirements, due to the broadcast character of the transmission medium. Based on the identity-based cryptography (IBC), and utilizing logical key hierarchy (LKH) approach, this paper presents an efficient key establishment scheme for distribution automation system using EPON. And the analysis results are also given in the paper.
Research on State Intelligent Maintenance Based on Sonic Information of Power Transformers
Authors: He Xuan Hu , Xia Ming Chao
Published: November 2011

The advantages and disadvantages of various power transformer fault detection methods are analyzed. According to the different sonic information of power transformers under different operation conditions, a new method for the power transformer fault detection based on sonic information is introduced. The overall structure of this method and the principle of intelligent maintenance are described. Preliminary operations proved that the method is feasible.
Time-Varying Sliding Mode Control for Linear Motor Servo System
Authors: Sun Yi Biao , Yang Lan , Wang Cheng Yuan
Published: November 2011

For the characteristics of permanent magnet linear motor (PMLSM) servo system in machine tool feeding system suffering from the effect of parameter variations, load disturbances and so on, the time-varying sliding mode position and speed controller was designed. By designing the time-varying sliding mode line, the line is changing with time t and its slope does not change during the control process. And the error state of the control system always lies on the sliding mode line from the beginning of any initial state. The reaching phase is eliminated. During the design process, because of the control signal is restricted, optimize the controller parameters by minimizing the integral absolute error (IAE). And the convergence rate of error is speeded up. The simulation results prove that the system have global robustness to the parameter variations and disturbance.
Interaction and Coupling of Robot
Authors: Xin Hong Bing , Huang Qiang
Published: November 2011

Robot interaction involves in the robot sociality, on the basis of bionics, robotic technologies, psychology, network and system science etc., after the basic characteristics of the robot interaction and implementation discussed, a design for coupling to heterogeneous robot for motion control is introduced. The dynamic coupling method of heterogeneous robots has been implemented by adopting the inheritance, polymorphism and template technologies.
Design of Underground Mining Personnel Locating System Based on nRF24L01
Authors: Chen Wen Gang , Song Xiao Jie , Liu Wei
Published: November 2011

An underground mining personnel locating system which takes nRF24L01 to establish data base-station for communication was demonstrated in the paper. The location and identification of the E-tag wearing mining personnel can be accomplished through the signal transmit-receiving of every base-station’s transceiver. The concerned information will be transmitted to the control station through the data substation to accomplish the personnel and equipment location, thus enhancing the underground mining safety production, disaster relief ability and management efficiency.
The Realization of Palm Kneading for Chinese Massage Robot
Authors: Du Guang Yue , Lu Shou Yin , Zhang Hua Kai
Published: November 2011

This paper mainly introduces the mechanical structure and parameters of Chinese massage robot, establishes coordinate system for the whole structure and on this base, establishes equations of motion for manipulator by D-H method. Then this paper makes a planning for trajectory of Palm kneading which is one of ten massage techniques, realizes it using interpolation method, and takes a simulation to the trajectory by MATLAB software at the end.