bluuebunny/crossref_metadata_2025 huggingface dataset:
Fractal of Grain Distribution in Mini-Sintering Sinter
Authors: Zhang Qing Jun , Mo Wen Ling , Li Yuan Liang , Zhang Yu Zhu
Published: February 2011

The sinter ore samples with different content of silica were prepared by the mini-sintering method so as to study the micro-mechanism of sinter. The fractal theory was also applied to analyze quantitatively the grain distribution in the samples’ two-dimensional microstructure. The study found that the grain distribution of the sinter shows the fractal characteristic, its fractal dimension is about 1.95, and the fractal dimension can be used to characterize uniformity of the grain distribution. With the increase of silica content, the fractal dimension of the samples shows a linear decreasing trend and it is the same trend in the comparing sintering-cup experiment when the fractal dimension of particle size distribution reduces, the silica content increases. In addition, the compressive strength of mini-sintering sinter sample was also measured. It shows that the compressive strength is the highest when the silica content is 3.8 wt%, which is correlative with the porosity, the content of calcium ferrite and glassiness in the sinter ore besides the fractal dimension.
Effects of Electrode Structure on Mass Transfer and Performance of PEM Fuel Cell
Authors: Jin Zheng Nan , Sun Hong , Zhao Sheng Nan , Sun Zhe , Luan Hua Li
Published: February 2011

Electrode structure plays an important role on performance of the proton exchange membrane (PEM) fuel cell. A two-dimensional, two-phase flow model is presented to simulate the performance of PEM fuel cell with direct flow fields and its mass transfer in cathode in this paper. Effects of depth and width of channel and depth of gas diffusion layer on the performance of PEM fuel cell and mass transfer in its cathode are analyzed. The results show that electrode structure affects strongly the performance of fuel cell and mass transfer in its electrode; when depth of channel is 0.75mm, there are the worst performance and mass transfer; decreases of the width of the channel and depth of the gas diffusion layer are beneficial to improving mass transfer and increase performance of PEM fuel cell. These results are very helpful for optimization of PEM fuel cells.
Characteristics Distribution in PEM Fuel Cell
Authors: Sun Hong
Published: February 2011

PEM fuel cell is an ideal power for modern automobile. Characteristics distribution of PEM fuel cell is one of key parameters for its application. Reactant gas stoic ratio, current density and charge capacity are measured by the current distribution measurement system, and their distribution and the influence of load on them are analyzed in this paper. Experimental results show that the reactant stoic ratio and charge capacity decrease along the gas channel; the optimal humidification temperature decreases with the increase of external load. These results are very helpful for the optimization of operating parameters of PEM fuel cell and its application.
β‘ Phase Precipitation in a Cold Rolled Cu-Zn Alloy under Electric Current Pulses
Authors: Wang Xin Li , Dai Wen Bin , Lu Yan , He Shi Yang , Zhao Xiang
Published: February 2011

β' phase precipitation in a cold rolled Cu-Zn alloy under high density electric current pulses was studied in the present work. The results showed that the precipitation of β' phase was controlled by the angle between the current direction and rolling direction. When the angle was 45º, the application of electric current could refine α phase without β' phase precipitation, while at 0º or 90º, β' phase precipitated from α phase boundaries and distributed along the rolled direction. It was proposed that the precipitation of β' phase during the application of high density electric current was determined by the electron wind force and anisotropic electrical resistivity of the grain boundaries.
Catalytic Reforming of Model Tar Compounds from Hot Coke Oven Gas over Pd Promoted Ni/Mg(Al)O Catalysts
Authors: Cheng Hong Wei , Lu Xiong Gang , Ding Wei Zhong , Zhong Qing Dong
Published: February 2011

Pd (0.1-1 wt%) loaded Ni/Mg(Al)O catalysts have been prepared by co-precipitation and impregnation methods, and their catalytic activities were tested in the catalytic reforming of tar components from hot coke oven gas (COG) with lower steam/carbon (S/C) molar ratio. The 0.5%Pd-12%Ni/Mg3(Al)O bimetallic catalyst derived from hydrotalcite showed excellent catalytic activity. The effect of reaction temperature on the catalytic performance was investigated in detail. Toluene could be completely converted into small gas molecules of CH4, CO and CO2 over the catalyst at S/C=0.42 and 600°C under atmospheric pressure.
Proton Exchange Membrane Fuel Cell(PEMFC) Lumped Modeling and Dynamic Performance Analysis
Authors: Jia Qiu Hong , Han Ming , Deng Bin , Zhang Cai Zhi , Xiao Yan
Published: February 2011

A model of PEMFC is developed that captures dynamic behavior for control purposes. It analyzes in detail the influence factor of voltage of PEMFC. The model is mathematically simple, and accounts for the essential phenomena that influence the PEMFC performance. The partial pressure of hydrogen and oxygen can be found using the laplace transform and differential form of ideal gas state equation. It is assumed that the mixture ratio of hydrogen and oxygen in the reaction are constant, the dynamic lumped model of PEMFC is proposed. The model is verified by comparing the experiment data with simulation result of model. On the basis of the dynamic model, the partial pressure and voltage are analyzed when when the load current suddenly changes.The research about lumped model has important significance to the research of the distributed generation network in various performances and has guiding meaning to the structure design of fuel cell.
The Effects of Calcium Fluoride Addition on Crystallization Characteristics of Hydroxyapatite-Zirconia Composite
Authors: Wang Li Li , Wang Xiu Feng , Zhu Jian Feng , Yu Cheng Long
Published: February 2011

Hydroxyapatite (HA) doped with 3% Yttria-stabilized 20vol%m-ZrO2 composite were synthesized by solid state reaction between tricalcium phosphate (TCP) and Ca(OH)2 at various temperature(1000 to 1200°C) for 3h with adding 5~20wt% calcium fluoride (CaF2), respectively. The effects of various amount of CaF2 on crystallization characteristics of HA-20vol%ZrO2 composite were investigated in details. The results show that when small amount of CaF2 was added, the reactions of HA with CaF2 occurs, which leads to the formation of fluorapatite (FA). With the increasing of the amount of CaF2, the decomposition of HA to β-TCP decreases gradually and the CaZrO3 peaks disappear, while t-ZrO2 increases because of the formation of thermally stable FHA solid solutions. When the sintered temperature is above 1100°C and the addition of CaF2 is about 10wt%, the main phases are FHA and t-ZrO2 with a negligible amount of Ca5P8, which suppress the reaction between HA and ZrO2. From SEM, it can be seen that with 10wt% of CaF2 addition, the morphology of the composite powder is a mixture of spherical ZrO2 particles embedded within agglomerated HA shaped like a small rod.
Development of Direct Quenching Process for SPV490Q Steel Plate
Authors: Xiao Gui Zhi , Wang Kuai She , Zhu Fu Xian , Di Hong Shuang
Published: February 2011

SPV490Q steel is a low alloy high strength structural steel plate used in the manufacture of oil storage tank. To improve the comprehensive performance of SPV490Q steel plate and reduce manufacturing costs, direct quenching technology has been developed as revolutionary plate manufacturing technologies in recent years. Effect of direct quenching on microstructure and mechanical properties of high performance SPV490Q steel plate has been studied. The direct quenched (DQ) steel plates are rolled at different finish rolling temperatures, and their microstructures and mechanical properties are compared with those of reheat quenched (RQ) steel plate. The optical microstructure of the DQ steel shows deformed grains elongated parallel to the rolling direction, while complete equiaxed grains are visible in RQ steel. The transmission electron microscope (TEM) microstructure of the DQ steel shows refined lath martensite with high density of dislocations. The findings indicate that the application of the direct quenching process to low-carbon alloy steels contributes to the production of steel plates with excellent strength and toughness.
Some Characteristics to the Related Food Processing for Garlic Fructan
Authors: Huang Xue Song , Wang Min , Bai Wei Bin
Published: February 2011

Garlic fructan (GF) is one of the main components of garlic (Allium sativum L.) and has been largely produced from the residue discharged from getting essential oil in China. Some GF characteristics of the related food engineering, such as solubility, oil absorbability, foam ability, moisture absorption and retention, thermal and acidic stability and the like were investigated. Results showed that GF was soluble in water, slight soluble in ethanol but insoluble in acetone, ethyl acetate or butanol. The precipitation increased as the concentration of alcohol rise. GF presented better oil absorption than casein, as well as higher capacities of moisture absorption and retention in humid and dry environment than glycerin, but lower frothing and foam stability than egg white. GF was not stable at the environment of high acid and temperature. These results provide foundation for the application of GF in liquor, fat substitute food, chemical medicine and other use.
Calcination Temperature Influence on the Microstructure and the Photocatalytic Properties of TiO2 Pillared Rectorite
Authors: Wei Zong Wu , Chen Jian Hua , Lin Mei Qun , Chen Ye
Published: February 2011

TiO2 pillared rectorite (TPLR) had been synthesized by sol-gel method, and was characterized by XRD, TEM, BET, UV-vis DRS and FTIR. The effects of calcination temperature on the microstructure and the photocatalytic activity of the as prepared catalyst were investigated. The photocatalytic activity of the catalyst was evaluated by decomposition of Acid Red B (ARB) aqueous solution. XRD patterns revealed that TiO2 is incorporated into the interlayer of the rectorite. TEM demonstrated that TiO2 particles are present in the rectorite. The BET analysis indicated that the surface area of the sample calcined at 300°C (TPLR-300) was larger than those of other samples. The TPLR samples had high adsorption capacity and good photocatalytic efficiency in decomposition of ARB in water. FTIR spectra of the original and the recovered samples indicated that the catalyst had not chemically changed during the photocatalytic reaction.
Photocatalytic Degradation of Methylene Blue by Modiflyed TiO2 under Visible Light
Authors: Zhao Zhao , Luo Xue Gang , Lin Xiao Yan
Published: February 2011

In this paper, we have studied the photocatalytic activity of TiO2 which was modified by ferric stearate; ferrocene and nickel N,N-dibuty dithiocarbamate (NiDBC) , respectively. Innovatively, methylene blue (MB) was used as model pollutant. Under visible light irradiation, this paper studied the effect of the photocatalytic degradation of MB. The result shows that when the mass ratio is 5:1, the catalytic effect is C>B>A. When mass ratio is 1:1, the catalytic effect is B>C>A. Another result shows that with the increase of the amount TiO2, catalytic effect of TiO2 modified by ferric stearate significantly increases, otherwise, TiO2 modified by ferrocene and NiDBC were different.
Effects of Activators on Compressive Strength of Fly Ash-Based Geopolymers
Authors: Wang Dong Min , Cheng Pei Fu , Fan Fan , Hou Yun Fen , Zhang Liang , Li Qiao
Published: February 2011

The effects of different activators on compressive strength of fly ash-based geopolymers have been studied. It is discovered that, alkali solution doesn’t have obvious effect, while Na2SiO3 solution has visible effect, the strength of samples rise with the increase of Na2SiO3 solution concentration. The effect of K2SiO3 solution is more obvious than Na2SiO3 solution, the strength of samples tend to first increase and then decrease with the increase of K2SiO3 solution concentration. The K2SiO3 solution with concentration of 2 M is the best activator to prepare geopolymers, which has compressive strength of 28.8 MPa at 28 d. When water glass are used as activators, the best modulus and solid content for Na-water glass (Na2O•nSiO2) are 1.2 and 32%, respectively. On this condition the sample’s compressive strength at 28 d is 38.9 MPa. However crystal calcium oxide is harmful for the compressive strength development, which is different with the conclusion accepted abroad.
Study on Style of Multi-Component Bamboo Blended Knitted Fabric
Authors: Chen Wei Lai , Gao Ying , Tang Zhe Bin , Zhu Jian Xiao , Yu Bin , Zhu Li Ping
Published: February 2011

In this paper, the indicators of multi-component bamboo blended knitted fabric style were obtained by FAST meters, and the relationship between the performance and the blend ratio of the bamboo fiber was analyzed. The results indicated that the value of fabric surface thickness, bending rigidity, the formability and shear stiffness linearly decreased with the bamboo fiber content increasing.
The Preparation of the Magnetically Separated Cu Doped TiO2 by Coating-Calcining Method
Authors: Chen Han Yu , Zhao Bao Shan , Li Zhao Hui
Published: February 2011

In this paper, a magnetic hollow fly ash microsphere(MHFM) was prepared by citrate sol-gel method and the Cu doped TiO2 nanopowder were prepared by sol-gel process at which the novel magnetic Cu-doped TiO2 photocatalyst (M-Cu/TiO2) was prepared by coating-calcining process. The crystal phase and morphology of M-Cu/TiO2 were investigated by Scanning electron microscopy(SEM), X-ray diffraction(XRD), The photocatalytic activities of the prepared photocatalyst under different preparation conditions were evaluated by the degradation of methyl orange (MO). Results showed that these TiO2 photocatalysts were highly efficient for the destruction of methylene orange in water. In addition, the multi-coating procedure made it possible to effectively control the physical properties of TiO2 layer such as the coating thickness, amount of TiO2 and photocatalytic activity. The floating catalyst made by this method could also be separated easily from the reaction system. And the multilayer film has higher photocatalytic activity than TiO2 film under visible light irradiation.
Effect of the Apparent Porosity of Porcelain Architectural Vitrified Tile on the Far-Infrared Property
Authors: Luo Ting , Gu Xing Yong , Wu Jun Ming
Published: February 2011

The study main researched the effect of apparent porosity of porcelain architectural ceramic materials on the far-infrared radiance property. T3J1, a formula of Mg-K-Al-Si system was used for the research and the materials were obtained when the body was sintered under five temperature spots in the sintering range. The material’s water absorption, apparent porosity and the far-infrared emissivity were measured and the results showed that the apparent porosity is increased because of the low sintering temperature. The more apparent porosity cause the surface of the material more coarse and the more radiation source and higher far-infrared emissivity. A correlation curve formula refers to the effect of the change of the apparent porosity (Δρ) of the T3J1 on the far-infrared emissivity(ε) was got under the mathematical analysis, that is: ε=εmax－0.0017－0.0004eΔρ/0.13138
Effects of Heat Treatment on some Physical Properties of Douglas Fir (Pseudotsuga Menziesii) Wood
Authors: Li Xian Jun , Cai Zhi Yong , Mou Qun Ying , Wu Yi Qiang , Liu Yuan
Published: February 2011

In this study the effect of heat treatment on some physical properties of Douglas fir (Pseudotsuga menziesii) was investigated. Wood specimens were subjected to heat treatment at 160, 180, 200 and 220°C for 1, 2, 3 and 4h. The results show that heat treatment resulted in a darkened color, decreased moisture performance and increased dimensional stability of wood. Compared with untreated wood, equilibrium moisture content (EMC), water absorption (WA) and volume swelling (VS) for treated wood decrease up to 42.63%, 34.93% and 67.47%. The higher the treatment temperature and the longer the treatment time, the lower EMC, WA and VS. The VS of treated specimens has a more significant reduction than EMC and WA when the heat treatment temperature is above 180°C. The visual color changes were more distinct after heat treatment above 180°C. Temperature has a greater influence than time on these properties of specimens.
Experimental Study on Mechanical Properties of Hybrid Fiber Reinforced Full Lightweight Aggregate Concrete
Authors: Pan Li Yun , Yuan Hao , Zhao Shun Bo
Published: February 2011

Tests were carried out to study mechanical properties of hybrid fiber reinforced full lightweight aggregate concrete (HFRFLAC), the hybrid fiber was composed by steel fiber and polypropylene fiber, the expanded-shale and lightweight sand were used as coarse and fine aggregates. The apparent density and strengths in cubic compressive, splitting tensile and flexural tensile states of HFRFLAC were obtained. The results show that the average dry apparent density increases with the increasing cement content, which is much more affected by fraction of steel fiber by volume than mass content of polypropylene fiber; the tensile strengths increase somewhat with the increasing mass content of polypropylene fiber; all of the strengths increase with the increasing fraction of steel fiber by volume, and obvious are the enhancement of tensile strengths; there are somewhat relevance between the effects of polypropylene fiber and steel fiber on mechanical properties of HFRFLAC.
Photocatalytic Oxidation Removal of Gaseous Benzene over TiO2 /ACF Composite Photocatalyst Prepared by Screen-Printed Technology
Authors: Liu Li Li , Li Chang Yu
Published: February 2011

The TiO2 /ACF composite photocatalyst was prepared by using the screen printed technology. X-ray diffraction (XRD) and scanning electron microscopy ( SEM) were used to characterize the obtained composite. The results of XRD show the TiO2 /ACF composite photocatalyst is confirmed anatase as the only phase present and ACF has no effects on the phase structures of TiO2. The results of SEM show that TiO2 can form thin film on ACF surface. Benzene was chosen as the model of the volatile organic compounds (VOCs) to investigate the capability of TiO2/ACF composite photocatalyst. The results show the TiO2/ACF composite photocatalyst have higher activity for benzene removal than only TiO2 photocatalyst.
Preservative Characteristics of Bamboo Treated by Camphor Leaves Extract
Authors: Xu Guo Qi , Liu Jun Liang , Hu Sheng Hui , Wang Xue Hua
Published: February 2011

In this study, Camphor leaves for the experimental materials, the activated composition was extracted by water, its consistency was 10%, and so the water extract was namely reagent A. The reagent B was obtained from added 5% MUF resins in reagent A, and the reagent C was obtained from added 10% MUF resins in reagent A. The Moso bamboo was treated respective by reagent A, reagent B, reagent C through vacuum/pressure process and the ability of resisted mould and mildew was tested. The results showed: The decay resistance of treated was stronger clearly than control, the weight lost rate was between 4% and 7%, it was up to the high anti-decay level. The decay resistance of treated by reagent B was strongest, so the appropriate MUF resins had function of fixation agent. The MOE and MOR of treated bamboo was almost equation to control. And the MOE and MOR of B and C was higher than control and A. It was feasible methods that the water extract of Camphor leaves was used to be a natural preservative. It was safe to human, animal, environment and the treated bamboo was an environmental friendly material.
Palladium-Based Catalyst without Interlayer Film Prepared by Electroless Plating for Catalytic Combustion of Toluene
Authors: Li Yong Feng , Li Yu , Huang Yan Ting , Yu Lin , Yu Qian , Mai Rong Jian
Published: February 2011

The palladium-based combustion catalysts on cordierite honeycomb ceramics (CHC) substrate without interlayer film (Pd/CHC) were prepared by electroless plating method. By means of scanning electron microscopy (SEM) and BET specific surface area, it was found that the palladium phases on the prepared catalyst after calcination treatment at 500°C were well dispersed on substrate with small and uniform particles. The X-ray diffraction, energy dispersion X-rays (EDX) analysis, adherence test and temperature programmed reduction (H2-TPR) analysis further indicated that the palladium phase had good adherence strength on the surface of CHC substrate and the moderate ratio of metallic Pd and PdO phase was only obtained on the catalyst calcined at 500°C . Moreover, the results of activity tests for toluene combustion showed that the 0.24%Pd/CHC catalyst had good low temperature catalytic activity and temperature-resistance property. The total combustion temperature (T90) for toluene over catalyst calcined at 300, 500 and 900°C was at 239, 225 and 233°C respectively. And the toluene conversion could keep up above 97% during the stability test of Pd/CHC catalyst at 230°C for 105 h, indicating the good catalytic stability of the prepared catalyst.
Solution Conformation of Konjac Glucomannan Single Helix
Authors: Wang Chao , Zhang Yu , Huang Hong Xia , Chen Mao Bin , Li Dong Sheng
Published: February 2011

The possibility of the existence of konjac glucomannan (KGM) single helix in dilute solution was discussed finely by ultraviolet-visible spectrophotometer (UV-Vis) with Congo red complex, viscosimetry and circular dichroism (CD). KGM bound to Congo red and the λ max characteristic shifted markedly to longer wavelength (514 nm) in 0.25 M aq NaOH. The shifts of λ max and intrinsic viscosity were also compared in different mediums, such as different concentrations of KGM, NaOH, urea solutions or temperatures. The results indicated that KGM had an ordered, single-helical conformation in neutral, slight NaOH (<0.15 M) and urea (<3.0 M) solutions or at a moderate temperature (T<55ºС ), while it was transformed disorder, random coils in high NaOH (>0.45 M), urea (>4.0 M) solutions or at a high temperature (T>60ºС ). So it can be conclude that the outside factors play an important role on the stability of the single-helix conformation for KGM solution. The induced CD spectra by Congo red and the CD spectra of KGM in aqueous and urea solution indicated further that KGM had a single-helical structure. The new conclusion laid the foundation of determining helical radius, pitch and length of KGM in the future studies.
Character of the Lateral Displacement of Soft Soil Foundation under Embankment
Authors: Liu Jie Qun , Liu Jin Long
Published: February 2011

In order to analyze the characteristic of lateral displacement of soft soil foundation under embankment, a typical embankment is studied systemically with nonlinear finite element method, and the location of maximal lateral displacement and its measuring method is also discussed. It is pointed that lateral displacement would be reduced possibly at consolidation stage with strong dry crust and thick soft soil layer, which happened synchronously with vertical settlement increased rapidly. This phenomena could not be measured conveniently with inclinometer pipe, for there are many shortcomings within this technique, although which has been used in engineering widely. It is also shown that the location of the maximal lateral displacement is changeable at different construction stages, which more likely lies in the vertical surface between the toe and the middle of slope of embankment. In order to get the maximal lateral displacement reasonably, it is suggested that the inclinometer pipes should be placed in that area of embankment.
Effects of SiO2/Al2O3 Ratio on Physicochemical Properties and Catalytic Performance of the Non-Templated ZSM-5 Zeolite
Authors: Liu Wei Qiao , Lei Wei Ning , Shang Tong Ming , Mou Zhi Gang , Wang Heng Qiang , Ren Jie , Li Gong
Published: February 2011

The ZSM-5 zeolites of various SiO2/Al2O3 ratios were synthesized without using any template agent. X-ray diffraction (XRD), transmission electron microscope (TEM), temperature- programmed desorption of ammonia (NH3-TPD) and Fourier transform infrared spectroscopy (FT-IR) techniques were employed to analyze the natures of the as-synthesized zeolite. The results show that the as-synthesized non-templated ZSM-5 zeolite is very pure. Meanwhile, Lewis acid sites and Bronsted acid sites are all presented in the as-synthesized non-templated HZSM-5 zeolite. The number of acid sites decreases almost linearly with the increasing of SiO2/Al2O3 ratio of the zeolite. In addition, the reaction of propylene oligomerization was carried out over the as-synthesized non-templated HZSM-5 zeolite to evaluate the catalytic properties. The results show that the catalytic activity of propylene oligomerization decreases with the increasing of SiO2/Al2O3 ratio.
Photocatalytic Degradation of Methylene Blue on MoS2/TiO2 Nanocomposite
Authors: Hu Kun Hong , Cai Yong Kui , Li Sai
Published: February 2011

A MoS2/TiO2 composite was synthesized and its photocatalytic activity for the degradation of methylene blue was evaluated. The results showed that the nano-MoS2/TiO2 composite presented excellent photocatalytic properties in the degradation reaction of methylene blue, which was ascribed to the good absorption of nano-MoS2/TiO2 in the visible light region. The decoloration rate of methylene blue solution was influenced by the dosage of nano-MoS2/TiO2 and the initial concentration of methylene blue. However, both the pH value and the degradation temperature had negligible effects on the decoloration rate of methylene blue. Moreover, the nano-MoS2/TiO2 composite as the degradation catalyst of methylene blue was of good regeneration properties.
Fault Diagnosis Based on Acoustic Emission Signal for Low Speed Rolling Element Bearing
Authors: Wang Hua Qing , Guo Yong Wei , Yang Jian Feng , Song Liu Yang , Pan Jia , Chen Peng , Yuan Hong Fang
Published: February 2011

The fault of a bearing may cause the breakdown of a rotating machine, leading to serious consequences. A rolling element bearing is an important part of, and is widely used in rotating machinery. Therefore, fault diagnosis of rolling bearings is important for guaranteeing production efficiency and plant safety. Although many studies have been carried out with the goal of achieving fault diagnosis of a bearing, most of these works were studied for rotating machinery with a high rotating speed rather than with a low rotating speed. Fault diagnosis for bearings under a low rotating speed, is more difficult than under a high rotating speed. Because bearing faults signal is very weak under a low rotating speed. This work acquires vibration and acoustic emission signals from the rolling bearing under low speed respectively, and analyzes the both kinds of signals in time domain and frequency domain for diagnosing the typical bearing faults contrastively. This paper also discussed the advantages using the acoustic emission signal for fault diagnosis of rolling speed bearing. From the results of analysis and experiment we can find the effectiveness of acoustic emission signal is better than vibration signal for fault diagnosis of a bearing under the low speed.
Vibration Isolation with Semi-Active Friction Damping
Authors: Liu Yong , Wen Li Hua
Published: February 2011

This study explores the effect of semi-active friction damping on vibration isolation systems by means of numerical simulation. Since the Lugre friction model can describe many phenomena observed in laboratories, it is chosen to provide accurate friction force model for the analysis and simulations. The drawback of the passive friction damping system is that it decreases the resonance response at the cost of worsening the performance for high frequencies. A semi-active control method (skyhook method) is used to tune the normal force so that the energy dissipated by the friction force is maximized. Such semi-active friction damping system is simple but efficient, and it can achieve result almost as good as that of active systems. Results from numerical simulations show that compared with passive system, semi-active control method decreases the response significantly for both low and high frequencies, with harmonic and random excitations.
Dynamic Structure Design of Large-Scale High-Speed Gantry Type CNC Milling Machine
Authors: Zeng Li Qiang , Ma Zhi Peng , Zhao Xing Yu , Zhang Da Wei
Published: February 2011

To design a milling machine with high static stiffness and machining precision, the three-dimensional (3-D) model and the finite element model of a large-scale high-speed gantry type CNC milling machine have been established according to the demand of engineering. The main components of the milling machine have been studied separately by static and dynamic analysis to make an optimal structure design. The results indicate that the structure of the milling machine has great static stiffness, little structural deformation, and good dynamic characteristics. The method used in this paper provides helpful theoretical guidance to the dynamic design of milling machine.
Adhesion Control of High Speed Train under Electric-Pneumatic Braking
Authors: Chen Zhe Ming , Luo Ren
Published: February 2011

As the result of wheel-rail surface conditions, external environment and vehicle speed change, the state of adhesion is changing. In order to ensure the validity and security of high speed train in braking, and obtain the maximum utilization of adhesion, control system must provide a stable and effective braking force. This paper presents a new pressure model of brake cylinder, and a 90 DOF vehicle dynamic model, uses Oldrich Polach’s model to calculate adhesion force, and adds a track irregularity on vehicle model. Switch signal controls brake cylinder. Direct torque strategy controls the induction motor, Recursive least squares determines the adhesion-slip state of wheels, Sliding mode control Strategy calculates the best braking force. The simulation results show the high brake performance of this wheel-slip prevention system, and the desired objective of control.
Research on Fabrication Techniques and Performance Analysis for 3×3 Cymbal Transducer Array
Authors: Du Yi Qun , Dai Rong , Pang Da Peng
Published: February 2011

The single array element of cymbal transducer has a low transmitting power, poor directivity and narrow bandwidth, which however can be improved, even overcome by array forming. First of all, 9 cymbal transducer array elements were designed and made on the basis of the research results obtained in the early stage, and were assembled into a 3x3 array by using a set of stable and reliable array forming techniques developed from the research. The array was shaped by casting with organic silica-gel and then getting cured. The array was tested in air for resonance frequency and equivalent circuit parameters demonstrating the stability of array forming techniques. The array and a single array element were also tested in anechoic water-tank for transmitting, receiving and directivity performances, and the result indicates that, the array forming by elements can strengthen the transmitting power and improve the directivity effect, but may reduce the free-field receiving sensitivity. The research has a great significance to the development of a new super multi-element cymbal array.
Response Analysis at Near Critical Point of Hopf Bifurcation in Nonlinear Systems
Authors: Chen Yu Dong , Pei Chun Yan , Chen Su Huan , Liu Xiao Jun , Zhang Jun Xing
Published: February 2011

It is well known that if for a nonlinear system the parameterphas a small change, the multiple non-semi-simple defective eigenvalue can be separated into close eigenvalues, which is known as the near defective eigenvalue. For such a case, although the close eigenvalues are distinct, the system still has bifurcation property in natural. This paper presents the response analysis method at the near critical point of Hopf bifurcation in nonlinear systems. A numerical example is given to illustrate the application of the proposed method.
Optimization Mathematic Model of the Arrangement of Aiguilles Cutting Picks
Authors: Li Jian Ping , Du Chang Long , Jiang Hong Xiang
Published: February 2011

Cutting performance of aiguilles mainly depends on the arrangement of cutting picks.This thesis took cutting specific consumption as the optimizing goal, spatial parameters of cutting picks as the designing variables,and then established the optimization mathematic model of the arrangement of cutting picks. Mathematic model was solved by Matlab programming, then got the optimized arrangement parameters of cutting picks. According to the optimized parameters, manufactured the aiguilles and carried out the drilling test.The result indicated that production efficiency and advance speed of optimal designed aiguilles were all improved, abrasion of cutting picks were roughly the same and there was no clear cut mark on the drlling holes.
The Analysis and Experiment Study on a New Driving Structure of Piezoelectric Vibration Feeder
Authors: Tan Xiao Dong , Zhao Yong Sheng , Liu Chen Bao , Zhang Kun
Published: February 2011

This paper has proposed a new structure of lateral diagonal tensile piezoelectric driving feeder which based on the study of foreign advanced technology of piezoelectric feeding devices. It has analysed the driving source and material movement properties of the new structure, and carried out the experimental research and analysis that based on the theoretical analysis. According to these, we get the relationships between driving voltage and feeding speed, frequency and feeding speed and the relationships among voltage, frequency and driving current. Measuring the driving power and compared with the electromagnetic vibration feeder, we obtained that the piezoelectric driving feeder’s energy-saving effect is remarkable. The whole machine has the superior performance.
Shearer Load Identification of the Load Spectrum of the Pick Based on Chaotic Characteristics
Authors: Liu Chun Sheng , Li De Gen , Chen Xiao Ping
Published: February 2011

Due to shearer drum suffers a very complex load，the traditional theoretical algorithm of cutting resistance is difficult to satisfy the analysis and design of shearer, and the load features of various conditions is hard to obtain with experimental methods. The study demonstrates that the time series of cutting resistance is of chaotic characteristics, and the cutting time series identified by the C-C method contains the characteristic parameters of the cutting power system. Based on the experimental and theoretical studies, the mathematical model of load of chaotic characteristics is established in the work process of drum, and the simulation results and characteristic quantities of actual load spectrum of shearer show the excellent agreement, which satisfy the theoretical calculation of quantitative load of shearer and provide certain theoretical basis for the analysis and design of shearer.
Dynamic Analysis of Communication Cabinet Structure Design
Authors: Yang Ning Ou , Liang Ying , Huang Chun Yue , Wei He Geng
Published: February 2011

Two communication cabinet finite element analysis(FEA) models with different cross-sectional structure vertical columns were set up. Based on the two communication cabinet FEA models, modal analysis was carried out by using the subspace method; the first 6 order natural frequencies and vibration modes were obtained. Harmonic response analysis was also carried out; the displacement response of the communication cabinet structure under external loading was determined. The dynamic performance comparison of the two communication cabinets with different cross-sectional structure vertical columns was performed, as a result, an effective method is provided for communication cabinet dynamic characteristic optimized design.
Modal Analysis of the Cabinet of a Drum Washing Machine
Authors: Fu Su Fang , Gao Han , Du Jia Xi , Zhang Qiu Ju , Zhang Xue Ming , Chen Xi Qu
Published: February 2011

In this paper, the finite element model for the cabinet of a drum washing machine and the model for testing vibration of the cabinet were developed in ANSYS software and PULSE™, respectively. A series of tests were conducted. The natural frequencies and mode shapes were obtained by finite element analysis and modal experiment, which revealed weak parts of the cabinet. Meanwhile, the computational modes were in good agreement with experimental ones and this could provide an available method by which it was convenient to improve the design of the cabinet.
Application of ANSYS Secondary Development in Magnetic Density Analysis of Permanent Magnet Synchronous Motor
Authors: Ma Cong Gan , Zuo Shu Guang , He Rong , He Lv Chang
Published: February 2011

In order to realize the rotation of permanent magnet synchronous motor and to carry magnetic flux density analysis of motor at 3-phase voltage load out, a set of ANSYS secondary development programming method with APDL is proposed in this paper. In this programming method, firstly, the rotational angle of the rotor at any time is calculated by two parameters of time and rotational speed. Secondly, the 3-phase voltage load at corresponding time can be got by two parameters of time and the 3-phase voltage frequency. Finally, according to the rotational angle of the rotor at any time and the 3-phase voltage load at the corresponding time, the whole process of the motor rotation is realized with ANSYS loop statement. This programming method solves the difficult problem that the rotor doesn’t rotate for ANSYS magnetic analysis and the magnetic flux density of permanent synchronous motor can be calculated more exactly.
Collision Analysis of Ship Side
Authors: Abdel Nasser Yehia , Aliraqi Aly , El Din Ali Bader
Published: February 2011

Structural design of ships against collision requires prediction of the extent of damage to stiffened plates subjected to impact. In ship structures, stiffened plates are furnished with vertical or horizontal stiffeners to sustain conventional loads such as shearing, bending and local buckling. The consideration of collision in ship structural design is especially important for tankers where accidents may cause serious environmental pollution. In predicting the extent of collision damage, FE modeling of stiffened plates using ABAQUS software is applied to demonstrate different collision scenario. Typical stiffened plates of tankers in service with different configurations of stiffeners are used to examine absorbed energy in each case. The aim of this paper is to examine the stiffener shape that absorbs more deformation energy.
Heat Load Analysis of Piston Based on the ANSYS
Authors: Yang Jing , Wang Yi , Xiao Ming Wei
Published: February 2011

The piston is a key part of engine,working in high temperature,high pressure and high load of harsh environment;Besides, periodic mechanical load and heat load work on it.Firstly,use the software UG to set up a geometry model of the piston;then use the ANSYS to set up finite element modle.We can learn about the total deformation with thermal load so as to find out the dangerouse and thermal stress points and provide theory for improving and optimizing structure of piston after mechanical load is added to the piston and coupling analysis is carried out.
Optimization Design of Piston Head on ANSYS
Authors: Wang Yan Xia , Gao Hui
Published: February 2011

Based on the axially symmetric of piston head, the 2D parametric model of piston head is established using the ANSYS software. The optimized design program is written by APDL language and the optimization is carried out using the ANSYS software, which provides a better reference for reliability and life of engine.
Structure Optimization of Slip by the Combination of Artificial Neural Network and Genetic Algorithm
Authors: Li Dian Xin , Zhao Hong Lin , Zhang Shi Min , Geng Dai , Liu Xian Long , Zheng Shan Jun
Published: February 2011

The bridge plug is a staple tool used in downhole operation and the performance of the slips has a directly influence on the oil well productivity and production safety. We raised an optimize method based on BP network and genetic algorithm to make sure the slips satisfy the high temperature and high pressure demands. Establishing the slips system and making finite element analysis by ANSYS, abtaining sixteen group datas to constitute the BP network training samples, establishing the BP simulation model reflecting curvature radius of the slip fluke, dip angle of the fluke, angle of the fluke and distance between flukes using nonlinearity mapping ability of the neural network, applying optimize design for the simulation model using global optimization ability of the genetic algorithm and abtaining the optimum structure parameters of the slip. The optimized results indicate the whole performance of the slips system has increased notably.
Optimal Design of Bogie Parameters Determination Test Bench Gantry Framework Based on SolidWorks/Simulation
Authors: Zhang Dong Lin , Su Jian , Cao Xiao Ning , Gong Hai Bin
Published: February 2011

On the basis of SolidWorks/Simulation FEA module, statics analysis and design optimization for bogie parameters determination test bench gantry framework are researched in this paper. Taking the optimization design of gantry framework main beam for example, an optimal mathematic model is established, the optimization goal is to reduce the quality of the main beam, and the constraints are displacement and stress. Simultaneously, the model is simulated by the SolidWorks/Simulation software. Compared with the initial design, the results show that the quality of main beam is reduced by 12.69%, the quality optimization goal of the gantry framework test bed is realized. Meanwhile, it not only reduced the design and manufacturing cost, but also enhanced the design efficiency.
The Structural Analysis and Rapid Optimization for High-Speed Spindle Box
Authors: Wen Huai Xing , Jun Lu
Published: February 2011

Through the optimization of the design process, the application of the finite element method and the structural parameters design have avoided blindness of product design, reduced unnecessary waste, waste of material and time for example. The fuzzy constraints has been determined by the sensitivity calculation , and the use numerical method and procedures of chart to analyze and compare, the target setting in the specified range has been searched for the structure. Thus the optimal design got achieved.
Modal Analysis of Cracked Plate Using Interval B-Spline Wavelet Finite Element Method
Authors: Peng Hui Fen , Meng Guang Wei , Zhou Li Ming , Yang Zhao Long
Published: February 2011

Aiming at the defects in describing stress field near the crack tip with traditional finite element method (TFEM), a new finite element method based on interval B-Spline wavelet (IBSW) is put forward, the displacement interpolation functions of plate element are constructed by using the scaling functions of IBSW, finite element model of cracked plate based on IBSW is established, and the stiffness matrixes of plate element is derived. The first four natural frequencies and mode shapes of the cracked plate are obtained by using interval B-Spline wavelet finite element (IBSWFE). Comparison of the calculated results with those by ANSYS shows that IBSWFE method can get higher calculation precision with less elements in dealing with engineering singularity problems.
Integrated Design of Materials and Structures with Scale-Coupled Effect
Authors: Liu Yuan Dong , Yin Yi Hui
Published: February 2011

It is well known that structural behaviors of composite solids are determined by topology of microstructures of different sizes. In this paper a concurrent topology optimization method for integrated design of materials and structures with periodical microstructure was presented. The microstructures were assumed to be uniform in macro scale and heterogeneous in micro scale and the optimization object was to minimize the material global compliances. Design variables for structure and material microstructures were defined, independently. SIMP (Solid Isotropic Material with Penalization) was adopted to ensure clear topologies in both macro and micro scales. Design variables for structure and material microstructures were integrated into one system by using the super-element method. Influences of Representative Volume Element sizes, material ratio of macro-scale and micro-scale on structural topology are investigated. Numerical experiments validate the proposed method which can be used as an innovative design concept for the lightweight structures.
The Research on Kinematics and Optimized Design of a Novel Parallel Mechanism with Six Freedoms
Authors: Fu Cai An , Hao Jian , Chen Wen
Published: February 2011

This paper proposes a novel parallel mechanism named 3/3-RRRS, and gives a research of direct and inverse solutions to positions of this mechanism. The equations of direct and inverse solutions are proposed by using vector method , and the analytical solutions of the inverse solution are given .There are many factors which influence the workspace, The article analyzes the specific factors that influence the workspace by using the software ADAMS, the workspace will function as a target for agencies to optimize the parameters.
The Impact Effect Study Due to The Suspender Break in Through Arch Bridges
Authors: Jiang Rui Juan , Chen Yi Yan , Wu Qi Ming , Yi Xiao Wei
Published: February 2011

It is well-known that in modern through arch bridges the suspenders are important components since they connect the bridge deck and the arch ribs. When the suspender break happens, the other components of the through arch bridge will be impacted successively. Sometimes, the collapse of bridge deck may be induced by the possible suspender break. In this paper, the impact effect on the remaining components of the through arch bridge due to the suspender break is studied and obtained by appropriate simulation and time-history analysis using the comprehensive commercial software ANSYS, which is based on a real through arch bridge. The study in this paper will be helpful to carry out the reasonable design of the through arch bridge.
Analysis of Seismic Vibration Reduction of Latticed Shell with Bucking Restrained Braces
Authors: Yin Zhan Zhong , Wang Xiu Li
Published: February 2011

The paper explores, theoretically, vibration reduction analysis of latticed shell equipped with Buckling-Restrained Braces with contact rings. Given the features of the long-span spatial structures, the paper put forward that to replace partial members of latticed shell by BRBs with contact rings results in the changes of stiffness and damp of the structure, which can improve the anti-seismic capability of the structure. Making K8 type lattice shell as the object of study, the paper carries out the seismic analysis under the action of the three-dimensional earthquake ground motion with step-by-step method in the time domain.
Analysis and Simulation on Dynamic Stress of Tracked Vehicle Sprocket Based on Rigid-Flexible Coupling
Authors: Chen Bing , Tian Zheng , Yin Zhong Jun
Published: February 2011

This paper established a high-speed tracked vehicle dynamics model, and simulated the transient response of sprocket when the vehicle is running at 60km/h on the D class road. the finite element model of the single tooth in mesh is established in Ansys and the rigid-flexible coupling model of "trackboard- sprocket" is established in RecurDyn. The dynamic stress and strain fringe of the sprocket’s gear ring is achieved by analysis. Simulation results show that the stress of tracked vehicle sprocket gear root and the fixed gear bolt hole is larger, and the stress concentration is detected at the edge of contacted tooth. The simulation results provide the calculation basis for the optimization of the high-speed tracked vehicle system and its lifespan prediction.