bluuebunny/crossref_metadata_2025 huggingface dataset:
Effect of Mixed Material on Sulphoaluminate Cement Sulfate Attack Resistance
Authors: Wang Gui Yun , Lu Ling Chao , Wang Shou De , Zhao Pi Qi
Published: August 2011

In order to enhance the ability of sulfate resistance of the coastal engineering, the effects of hydroxyapatite, shell and calcium carbonate on the mechanical performance and sulfate attack resistance were studied. The composition and structure of hardened cement paste were analyzed by means of X-ray diffraction and scanning electron microscopy. The experimental results showed that with the increase of mixed material contents, the compressive strength decreased, while the content of hydroxyapatite was 5%, the strength reached highest. The ability of sulfate resistance was improved as appropriate amounts of hydroxyapatite, shell and calcium carbonate were added into the cement. When the content of hydroxyapatite was 5%, the corrosion resistance coefficient was1.24, reaching the best resistance to sulfate attack.
Large-Sized TiO2/SiO2 Macroporous Materials for Photo-Degradation of Organic Compounds in Water and Air
Authors: Zhang Rui Feng , Ye Jian , Long Neng Bing
Published: August 2011

Large-sized macroporous TiO2/SiO2 catalysts were prepared via filling a novel SiO2 support with a solution of tetrabutyl titanate in cyclohexane, undergoing subsequent in situ hydrolysis and final calcination to 600 °C. The loaded nano-particles of TiO2 were uniformly dispersed on the nano-layer of SiO2 support, the interaction of TiO2 and SiO2 was strengthened through the formation of Si-O-Ti bonds. Methyl orange was introduced in the macroporous catalyst as a target compound to investigate the photo-degradation of the loaded nano-TiO2. Under radiation of 365 nm UV light the highest degradation rate constant of 1.78/h was observed from the as-prepared catalyst containing 54.5 wt.% of TiO2. Formaldehyde and xylene in gas states can be captured and photo-degraded by the catalyst that was placed in a self-designed air-circulation device equipped with UV lights and electric fans. The high effectiveness of the catalysts in the cleaning of the indoor air should be owing to its special macroporous structure and the long-term photo-catalytic activity of loaded nano-TiO2.
Facile Fabrication of Free-Standing Titanium Dioxide Nanorods Array with Highly Efficient Ultraviolet Light Induced Photocatalytic Activity
Authors: Zeng Tao , Xie Hao , Sui Xiao Tao , Zhao Xiu Jian
Published: August 2011

In this paper, the fabrication and characterization of free-standing titanium dioxide nanorods array film with pure anatase-phase are presented. Highly oriented TiO2nanorods array was firstly prepared by hydrothermal method with metal Ti foil, and then the free-standing film can be obtained through selective-dissolution of the metallic Ti substrate by Br2steam with preserving the original array structure. The crystal structural, morphological, lattice structural and optical information of the free-standing array film were studied. In addition, photo-degradation of crystal voilet in aqueous solution was used as a probe to assess the photo-catalytic activity of the free-standing array film under UV irradiation.
Hard-Templating Synthesis of Mesopours La1-xSrxMnO3+σ Perovskite and Catalysis Activity in CO Oxidation
Authors: Huang Xue Hui , Li Ming
Published: August 2011

La1-xSrxMnO3+σperovskite/ySBA-15(x=0, 0.1, 0.2, 0.3、y=0, 1, 2, 3) catalyzers were prepared by two different methods, which are the hard-templating and sol-gel methods. The catalysts were characterized by Fourier transform infrared spectroscopy(FTIR), scanning electron microscopy(SEM), energy-dispersive spectroscopy(EDS), X-ray fluorescence spectroscopy(XRD) and N2adsorption/desorption(BET). Their catalytic activity in the oxidation of CO was evaluated. BET and SEM results showed that the repeated template samples had higher surface area(143.7m2/g) and smaller particle size(18nm). The catalytic activity for CO reached the highest value when x=0.2 and y=2. The repeated template samples had higher activity than the sol-gel samples due to the higher surface area.
Complexional Ultrafine Zinc Oxide Powders Prepared by Controlled-Release Precipitation
Authors: Tong Zhi Fang , Li Yinq Jie , Lian Li Xiu
Published: August 2011

The synthesis of complexional ultrafine zinc oxide powders by controlled-release precipitation method, which is a precipitation process of precursor by controlling ammonia distillation rate in ammonia solution under the combination effect of microwave heating and ultrasonic cavitating, and followed by subsequent heat treatment was investigated. The characteristic of precursor and zinc oxide powders were studied using X-ray diffraction, scanning electron microscopy, TG-DTA-DTG, FT-IR, and ultraviolet-visible pectrophotometer. The coloring mechanism of complexional zinc oxide is discussed. This has shown that a tentative composition of the precursor is likely Zn3CO3(OH)4·H2O. Complexional zinc oxide particles of an average particle size of 200 nm with narrow size distribution, good dispersibility and hexagonal appearance could be obtained after annealing at 350°C for 1.5 hour. ZnO particles are complexional, probably due to nitrogen atom or N-H bond entering into crystal lattice of zinc oxide. Complexional zinc oxide has fine capacity of shielding UV and absorbing wide range of wavelength.
Synthesis and Characterization of Mesoporous SAPO-11 by Using Carbon Particles
Authors: Liang Jun , Wang Fu Ping
Published: August 2011

Mesoporous SAPO-11 was synthesized hydrothermally by using carbon black and di-n-propylamime (DPA) as templates for the expected mesopores and micropores respectively. The samples were characterized with XRD, nitrogen physisorption, SEM and NH3-TPD techniques. The mesopore volumes of mesoporous SAPO-11 are in range of 0.037 - 0.052 cm3/g. The same amounts of the acid sites according to NH3-TPD results in both mesoporous and conventional SAPO-11 products indicate that the carbon black involved in the synthesis doesn’t affect the crystallization efficiency of SAPO-11. The mesoporous SAPO-11 samples exhibit higher activity compared with conventional ones, especially under low reaction temperature. The enhanced activity can be attributed to the introduction of the mesopores in the zeolite crystals, which decreases the intracrystalline mass transfer limitations.
Analysis of Photo-Degradation of Dyed Veneer by XRD and SEM
Authors: Liu Yi , Gao Jian Min , Shao Ling Min , Guo Hong Wu
Published: August 2011

The influence of ultraviolet radiation on photo-degradation of dyed veneer surfaces of Betulacostata Trautv has been examined in this study. Dyed veneer powder specimens were irradiated with a 45-watt UV light source and exposed 100 hours were analyzed and characterized for color, crystallization performance and microstructure changes by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results show that dyed veneer powder specimens took a remarkable change (photo-discoloration) in color with increasing irradiation time. The lattice structures of crystallite in wood cellulose were not destroyed by UV radiation, and the two theta angles and layer spacingdin crystallite were constant. The relative crystallinity of dyed wood presented an increase at initial period of exposure which decreases upon prolonged exposure, but the change was not apparent, no greater than 3%. Wood microstructure has exhibited obvious deterioration, pit membrane in wood cell walls as well as wood fiber surface stripping phenomena. Analysis of the crystal properties changes and SEM measured indicate that photo-degradation of dyed veneer is mainly due to dye stuffs in prophase and based on wood in anaphase.
High Quantum Efficiency Dependence on Structure Optimizatin for Gallium Nitride Photocathode
Authors: Fu Xiao Qian , Wang Xiao Hui , Yang Yong Fu , Chang Ben Kang
Published: August 2011

We optimized the gallium nitride(GaN)photocathode’s structure in three aspects for higher quantum efficiency. AlN is used to replace GaN as the buffer layer, which can act as potential barrier to reflect electrons back to surface. The optimal thickness of emission layer is calculated as 162.5nm, and considering the graded doping profile, we optimized the thickness as 180nm. Three built-in electric fields are introduced by Mg graded doping, and the intensities of the high fields are calculated to give the quantitive results of their influence on quantum efficiency. After surface cleaning and activation, quantum efficiency of the optimized sample was greatly increased and the highest value of 56% was achieved at 5.20eV. More quantum efficiency enchancement is possible by further optimizing the photocathode structure.
Preparation of N-Doped TiO2/NiO Composite Electrode and its Photoelectrochemcal Characteristics
Authors: Wang Chun Tao , Zhang Wen Kui , Huang Hui , Tao Xin Yong
Published: August 2011

TiO2-xNx film was prepared by the combination of sol-gel and spin-coating method on indium-tin oxide (ITO) conducting glass substrate. Then an ITO/TiO2-xNx/NiO composite electrode was obtained by chemical bath deposition (CBD). The morphology, crystal structure and composition of the ITO/TiO2-xNx film were characterized by SEM, XRD, and XPS. The photoelectrochemical properties of the ITO/TiO2-xNx/NiO electrode were evaluated by photocurrent transient measurements and UV-visible transmittance spectra. The results showed that the ITO/TiO2-xNx/NiO electrode was sensitive to light and exhibited a noticeable photoelectrochromism.
Preparation of PVA/PEG Phase Change Composite Nanofibers by Electrospinning
Authors: Sun Da Hui , Xu Tian Yu , Liu Yong Jia , Zhang Mei
Published: August 2011

Phase change PVA / PEG composite nanofibers were prepared by electrospinning, micro-morphology of PVA / PEG fibers with different weight content were analyzed, the phase change characteristics were also analyzed. The result showed that well distributed composite nanofibers which composed by PVA/PEG blend solution can be obtained by electrospinning.PVA fibreforming were influenced because of the existence of PEG, including bond, irregular block, small rough, uneven diameter distribution in fibers. PVA/PEG blend solution of 4:6 weight content was well fibreforming compared with other different weight content.The continuity of spinneret flow in electrospinning would directly affected by polymer solution consentrition and viscosity. Further research about which and the influence in fibers diameter and morphology will be explored. Composite nanofibers possessed reversible phase transition characteristics,Tm Essentially unchanged ,Tcwere related to the weight percentage of PEG/PVA, at the same time, the enthalpy will increase along with the gradually increase in weight percentage of PEG.
Effects of Sintering Temperature on Properties of W-9.8Ni-4.2Fe Alloys Fabricated by Spark Plasma Sintering
Authors: Li Xiao Qiang , Hu Ke , Chen Zhi Cheng , Xin Hong Wei
Published: August 2011

The effects of sintering temperature on the properties of W-9.8Ni-4.2Fe alloys fabricated by spark plasma sintering were studied. The peak, base, repetition frequency of pulse electric current and the initial average no-load current were chosen as 3000A, 360A, 50Hz and 1200A during the sintering process, respectively. Research results show that W-9.8Ni-4.2Fe alloy, consolidated by SPSing for 6min at 1250°C under a pressure of 30MPa, has a relative density of 97.72%, hardness of 41.8HRC, transverse rupture strength of 1443MPa, and compression strength of 2640MPa. Its combination properties are topmost among all specimens sintered at various temperatures, which is attributable to the microstructural characteristics of dense microstructure, uniform distribution of binder, low connectivity of W-W and good metallurgic bonding. The optimal fracture surface in relation to the microstructure is dominating tungsten intergranular fracture, accompanied by local transgranular fracture in tungsten phase and ductile avulsion of the binder phase.
Study on Synthesis and Adsorption Properties of Chitosan Modified by DMF Grafted β-CD
Authors: Lv Zhen , Lu Fu Guang , Fan Lu Lu , Qiu Hua Min , Luo Chuan Nan
Published: August 2011

The synthesis chitosan modified by N,N-dimethylformamide(DMF) grafted β-CD (CTS), adsorption experiments of lanthanide ions, a new type water treatment agent, are discussed in this paper. First, the chitosan was modified by DMF, and then β-cyclodextrin (β-CD) was grafted onto chitosan skeleton by epoxy chloropropane. The effects of temperature, pH value, adsorption time on adsorption content were studied. The water treatment agent have a high lanthanide adsorption rate up to 98% compared to chitosan, b-CD and chitosan derivative bearing β-cyclodextrin.
Corrosion Resistance of the Eletrodeposition Nano-TiO2/Ni Composite Coating on AZ91HP Mg Alloy
Authors: Yu Si Rong , Liu Yan , Liu Jia An , Yuan Dong Sheng
Published: August 2011

The eletrodeposition nano-TiO2/Ni composite coating on AZ91PH Mg alloy was prepared using the nano-TiO2 as the second phase particles. The corrosion resistance of the composite coating was measured by the static immerging corrosion test and the polarization curve test. The result shows that the corrosion resistance of the composite coating was better than that of Mg alloy. The corrosion resistance of the composite coating was optimal when the content of nano-TiO2 in the plating solution was 10g/l-15g/l.
Synthesis and Properties of Electroless Ni-P-W/Nano-Al2O3 Composite Coatings Deposited on Sintered NdFeB Permanent Magnet
Authors: Chen Huan Ming , Gao Ya Hong , Lv Qiong , Yang Dong , Lin Xin Xin
Published: August 2011

The Ni-P-W/nano-Al2O3composite coatings were deposited on the surface of sintered NdFeB permanent magnet by electroless plating method. The morphology and the phases of Ni-P-W/nano-Al2O3composite coatings were investigated using scanning electron microscopy and X-ray diffraction respectively. The hardness and the corrosion resistance of the composite coatings were also tested. The results indicated that the composite coatings morphology appears closely nodules morphology, and the microhardness increases with increasing incorporation of Al2O3ratio. Compared with NdFeB magnet and Ni-P-W alloy coatings, the corrosion resistance of the composite coatings was superior to that of the NdFeB magnet and the alloy coating obviously.
Preparation and Application of the Vesicant in Gypsum
Authors: Zhang Wei Hao , Li Guo Zhong
Published: August 2011

Gypsum and vesicant were used to manufacture foamed gypsum by physical foaming. The effect of different components of vesicant on the properties of bubbles and gypsum slurry were confirmed in the experiments. The changes of dry bulk density and thermal conductivity of foamed gypsum were studied in the conditions of adding bubbles. The results showed that the comprehensive performance was better when adding150ml bubble to 300g gypsum, compared with blank sample, the dry bulk density and thermal conductivity of the samples decreased by 38%, 36% respectively, the dry bulk density was 812 Kg/m3 and the thermal conductivity was 0.18 W/m•K.
Study on Anti-Ultraviolet Radiation Aging Property of TiO2 Modified Asphalt
Authors: Sun Shi Shuang , Wang Yan Min , Zhang Ai Qin
Published: August 2011

In order to decrease the disadvantageous effect of ultraviolet light to asphalt, nano-scaled TiO2 was selected as modifier to modify asphalt. The photooxidation properties of the modified asphalt were examined in a home-made ultraviolet radiation environment box. By comparing the before and after performance indexes of asphalt, the anti-photooxidation aging property of modified asphalt and the blank asphalt were studied. And the results showed that the sample of 5% TiO2 modified asphalt possesses more stable ductility and smaller softening point changing ratio.TiO2 doping can actively enhance the photooxidation properties of asphalt and TiO2 modified asphalt is capable of resisting photooxidation aging.
Effect of P2O5 on the Properties of Alite-Calcium Strontium Sulphoaluminate Cement
Authors: Yin Chao Nan , Lu Ling Chao , Wang Shou De
Published: August 2011

The influence of P2O5on the properties of alite-calcium strontium sulphoaluminate cement was researched by means of X-ray diffraction, scanning electron microscope-energy dispersive spectroscopy (SEM-EDS) and petrographic analysis. The results show that the optimal content of P2O5is 0.3% and the compressive strength of the cement at 1, 3, 28d are 27.0, 59.1, 110.9MPa when the calcining temperature is 1350°C. P2O5mainly exists in the belite and a suitable amount of P2O5can promote the formation of C1.5Sr2.5A3and alite. When the content of P2O5is higher than 0.3%, the formation of C1.5Sr2.5A3and alite can be hindered. P2O5can enhance the hydration heat evolution rate in the acceleration period and the hydrate heat of cement containing P2O5increases slightly.
Research of Multi-Objective Optimization Study for Job Shop Scheduling Problem Based on Grey Ant Colony Algorithm
Authors: Fang Ya Dong , Wang Fang , Wang Hui
Published: August 2011

In order to resolve Multi-objective job shop scheduling problem, an optimization method of many goals scheduling based on grey relation theory and ant colony algorithm is proposed. Firstly, this paper introduces the relevant mathematical theory. AHP and Grey relational analysis, and they are combined to solve the choice of pre-processing equipment under the multi-objective conditions. What's more, ant colony algorithm is discussed to solve problem of processing order for machine. The effectiveness of multi-objective algorithm for job shop scheduling problem is verified through applying example.
The Design of Adaptive Immune Vaccine Algorithm
Authors: Yuan Gui Li , Xue Yan Guang , Liang Qing Jiao
Published: August 2011

Aiming at disadvantages of Genetic Algorithm (GA) and learning from the immune system theory, this paper introduces immune memory cell of immune theory, vaccine extraction and vaccination operator based on immune theory, and adaptive probability crossover and mutation operator to GA, to improve the optimization ability and search efficiency of GA, and proposes Adaptive Immune Vaccine Algorithm (AIVA). Then proves the convergence of the algorithm, gives the composition mechanisms of the key operators, and verifies the role of each operator. Finally, four test functions have been optimized using GA, AIGA and AIVA. The experimental results show that AIVA effectively overcomes the GA Defects, greatly prevents the degradation of population, and has perfect convergence stability and excellent global optimization capability.
Prediction of the Surface Roughness in High-Speed Machining Based on Molecular-Mechanical Theory of Friction
Authors: Wang Su Yu , Wang Wen Chao , Yu Tao , Jiang Bin
Published: August 2011

Surface roughness is an important parameter to evaluate the quality of high-speed machining (HSM). This paper establishes a mechanical model based on the molecular-mechanical theory of friction to study factors that influence the surface roughness in HSM. The relationship between flow stress and the remnant height on the machined surface is obtained. The HSM process of AISI-1045 steel is simulated by using finite element method (FEM) based on DEFORM-2D and the flow stress is obtained. The surface roughness of workpiece machined by HSM is calculated based on the value of flow stress and the mechanical model. The result shows that the surface roughness of workpiece in HSM is acceptable, and the mechanical model supplies a method to study the surface roughness in HSM.
The Contrastive Analysis between Dry Earth-Fetching Rectangular Scant Pile and Circular Bite Pile
Authors: Mu Chun Mei , Zhang Qing , Liu Bao Chen , Zhang Qing
Published: August 2011

Combined with the new development of protecting pile of foundation pits in Ningbo soft soil area. On the premise of summarizing the present calculation of supporting structure, contrasting borehole case-in-place pile of circular cross section with rectangular borehole case-in-place pile and soldier piles according to the theory of equal-rigidity calculation and the analysis of reinforcing quantity calculation. we figure out that the rectangular borehole case-in-place pile have an potential in saving materials.
Research Status and Development Trend of Narrow-Gap TIG Welding
Authors: Sun Qing Jie , Hu Hai Feng , Yuan Xin , Feng Ji Cai
Published: August 2011

This paper reviews the research of narrow-gap TIG welding. It contains narrow-gap welding with double arcs, narrow-gap welding with double wires, compounded narrow-gap welding, TIG welding under controlled magnetic arc and ultra-narrow-gap welding. It analyzes the merits and drawbacks of every manner in narrow-gap welding. Considering the little groove angle and small gap, how to make sure sidewall fusion, the improvement of fusion welding forming and the prevention of weld crack are focal points of narrow-gap welding researches. The further development of electrical and visual sensors can lower the precision of work piece assembling and solve the central location problem of electrode. Narrow-gap welding will have a good application foreground.
Multi-Level Fuzzy Comprehensive Evaluation for Rapid Manufacturing System
Authors: Tao Li Hua , Li Ren Jiang , Bai Jun Feng
Published: August 2011

In order to evaluate a RMS roundly and objectively, a multi-level fuzzy comprehensive evaluation approach based on analytic hierarchy process (AHP) is proposed in this paper. Firstly, a hierarchical and comprehensive evaluation index system for RMSs is extracted. Then, based on this structure, a multi-level fuzzy comprehensive evaluation model is developed, in which AHP is incorporated to determine factor weights.
Static & Dynamic Analysis and Optimization of DVG850 High-Speed Vertical Processing Center
Authors: Gao Dong Qiang , Zhang Fei , Mao Zhi Yun , Yi Jiang Miao , Lin Huan
Published: August 2011

The main structure of DVG850 high-speed vertical machining center is instructed in the paper, the solid 3D model of the machine is established by SolidWorks, and then improted into ANSYS Workbench to do static and dynamic analysis. Firstly, the static analysis of high-speed vertical machining center is studied to get the deformation figures. From the analysis of the deformation figures, we can find the locations of weak static stiffness. Next, the modal analysis is studied and the order of natural frequencies we need are obtained. Through the analysis of the vibration modes of this machine tools, its relative weaker parts are pointed. Finally, The structure of the machine tools is improved according to the analysis results. The static and dynamic characteristics of the improved structure are apparently better than that of the original design. It makes a base for optimized design and remanufacturing. .
Direct Power Controlled Three Phase Boost Type PWM Rectifier Based on Novel Switching Vector Table
Authors: Li Guang Ye , Wan Jian Ru , Li Ming Shui
Published: August 2011

The reactive power is out of control near the fundamental voltage vector in traditional direct power control system, which leads to the current distortion at AC side and the voltage fluctuation at DC side. The mechanisms of the instantaneous active power and the reactive power are analyzed based on the instantaneous power mathematical model of the PWM rectifier. A new direct power control strategy is researched based on novel sector division and novel switching table. This method not only has the advantage of rapid regulation for active power, but also can restrain reactive power fluctuation and reduce switching frequency. Simulative and experimental results verify its feasibility and effectiveness.
Structure Fatigue Life and Reliability Analysis Based on Fatigue Crack Growth Data
Authors: Gao Li Hong , Xu Ge Ning , Yang Ping
Published: August 2011

The random formula on fatigue crack growth is deduced by the fatigue crack data and the improved Taguchi method, and the sample estimates of random variables are received by the least square method in the random formula. Fatigue fracture life and reliability of structure are analyzed by the random model. The result show the model is correct and practical, and get the same result with Monte Carlo simulation, moreover its calculation is very simple.
Effects on Fatigue Life of Bolt by Scatter of Pre-Tension Stress
Authors: Du Hong Kui , Kong Fan Yu
Published: August 2011

This paper adopts contacting finite element method to perform exact stress and strain analysis on bolt joint structure, and the curve of pre-tension stress-life σp-N was drawn. According to the curve, production practice can be well guided and the optimum pre-tension stress may be obtained .By the means of curve between load and deformation, the curve shape of σp-N was analyzed in detail, the results showed that the analysis by finite element was coincident with mechanics analysis.
Review of Vision Real-Time Inspection Algorithm for Rolling Steel Surface Defects
Authors: Li Wu Bin , Lu Chang Hou , Zhang Jian Chuan
Published: August 2011

Rolling steel surface defect inspection technology based on machine vision is more and more widely used. The latest progress of vision-based real-time inspection algorithm for rolling steel surface defect at home and abroad is introduced, and several key issues are analyzed. Finally, the current domestic research emphases and development trends are proposed.
Designing of Temperature and Thermal Displacement Measurement System in Machine Tools
Authors: Bao Ze Fu , Zang Peng , Wang Jiang Ping
Published: August 2011

This paper describes the multi-sensor of the data acquisition and signal analyzing based on the development of virtual instrument. It sets up a virtual instrumentation with the function of data acquisition and signal analysis, based on computer, temperature sensor, displacement sensor, PCI data acquisition card, and software of LabVIEW8.5 .The data acquisition, preprocessing, displaying, storage and data playback are integrated in this platform, forming an easy-to-use temperature and thermal error detection system.
Computer Simulation and Test for the Profilograph
Authors: Bao Li , Wang Jun Feng
Published: August 2011

Based on the theories of aerostatic slideways and B-spline curve, structure of aerostatic slideways and process way to measure data were designed, and taking the gothic arch of 116716 bearing outer ring as an illustration, the computer simulation for the profilograph has been completed using the software MATLAB and VB. The results offered automatical data and image analysis through contrasting with the output of Talysurf and parameters of design. The results offered by the comparison showed that the profilograph designed meets the requirements of accuracy.
Design and Simulation of Two Stage Pressure-Controlling Spill-Protecting Breathing Valve
Authors: Zuo Yong Gang , Chen Jun , Yang Jing , Lü Hong Qing , Zhang Zhen
Published: August 2011

The effect of breathing and spill-protecting of the breathing valve on the vehicle oil can have great influences on the safety of the whole vehicle. The breathing valve is studied in this article, and a new two stage pressure- controlling spill-protecting breathing valve is designed. The 3D model of the breathing valve is built in Pro/E, and the kinetics analysis of the key point of the breathing valve is done in ADAMS, which can provide theoretic guidance for designer to optimize structure design.
Dynamics Analysis and Cam Profile Optimal Design of the Valve Train in the Diesel Engine with High Specific Power
Authors: Sun Li Wei , Su Tie Xiong , Xu Jun Feng , Wang Qiang , Xu Chun Long , You Guo Dong
Published: August 2011

The study carries out optimal design for the cam profile of the valve train in a high-specific-power diesel engine. The dynamic analysis on the original cam reveals that the original one, which leads to adequate fullness coefficient, is designed far from the material margins. The fullness coefficient and time area value are selected as the optimization objective, and the piecewise fucntion method is utilized to optimally design the cam profile. The restrictive contidons are applied to each section on the cam. Thus the function and the optimal coeficients are obtained. Then the dynamic analysis and working process simulation on the optimal valve train are carried out, and it proves that the dynamic and intake port performaces of the optimized one are greatly impoved.
Predictive Design for Intake Port of HPD Diesel Engine
Authors: You Gou Dong , Su Tie Xiong , Xu Jun Feng , Li Kun
Published: August 2011

In an investigation to gain a deeper understanding of the relationship between port geometry and performance characteristics, a parametic intake port design tool has been developed using statistical design-of-experiment (DOE) techniques. Flow coefficient is a very important parameter, constraints are used to represent additional features in the external packaging requirements. A thorough assessment of performance was made possible by using rapid-prototype models and numerical simulation and the intake port steady flow. The in-cylinder flows were successfully validated by comparing predicted results with new test data. By analyzing the DoE data a design method was developed and used to predict optimum design configurations for a range of common diesel engine applications.
Study on Consolidation Coefficient by Different Test Methods
Authors: Tang Yan Chun , Meng Gao Tou , Gong Ji Chang
Published: August 2011

Through indoor consolidation test and CPTU model test and CPTU in-situ test, the soil consolidation coefficient has been studied. Compared with the consolidation coefficient by indoor test equipment and CPTU, because in-situ test has been made by CPTU, but in indoor consolidation test the error caused by the disturbance and little size of clay soil sample has been existed, the soil consolidation coefficient by CPTU can reflected the soil consolidation characteristics more accurate than by indoor consolidation test. Compared with the consolidation coefficient by remolded clay soil of CPTU model test and the natural and un-disturbed clay soil of CPTU in-situ test on CPTU application research project on Pearl River Delta, the dissipation speed of excess pore pressure in CPTU model test is faster than in CPTU in-situ test; the horizontal consolidation coefficient value of clay soil by CPTU model test and CPTU in-situ test is close in the same magnitude order. The test result by CPTU model test is close to the result by CPTU in-situ test. The achieved result can provide a foundation for further study for soil consolidation coefficient by CPTU.
Application of Neural-Fuzzy System in Data Processing of Hydraulic Torque Converter’s Performance Test
Authors: Tian Guo Fu , Wang Shi Jie , Sun Shu Hui , Ren Zhong Wei
Published: August 2011

Aimed at the need of data processing and analysis in the performance test of hydraulic torque converter, we put forward a way of test data analysis using neural-fuzzy system. It can reduce manual participation, improve the data processing ability, accelerate computing velocity and realize data handling automation. We can judge product’s performance by this method. The use in experiment data indicates that it can express the relation of original data nicely. The identifying accuracy of data is good. It can satisfy the request of test data analysis and the analytical conclusion is accurate too.
The Stress Analysis about Rolling-Sliding Blend Bearing under Heavy Load
Authors: Lu Li Ming
Published: August 2011

In the paper a new kind of rolling-sliding blend bearing has been studied. In order to comparing the new bearings and rolling bearings in the carrying capacity and service life, the stresses on the inner ring, the outer ring and the roller of rolling bearing and rolling-sliding blend bearing are analyzed by establishing the finite element model and solving it with finite element analysis software. The results show that the width of the stress concentration area on the outer ring and the roller and the inner ring of rolling-sliding blend bearing is 25 per cent narrower than that of rolling bearing and the depth of the largest stress on the outer ring and the roller and the inner ring of rolling-sliding blend bearing is 25 per cent shallower than that of rolling bearing and the largest stress on the middle and the end of the outer ring and the roller and the inner ring of rolling-sliding blend bearing is much smaller than that of rolling bearing. In the same case rolling-sliding blend bearings have greater carrying capacity and longer service life than rolling bearings.
Discussion on Application of Pressure Drop Computation Model in Gas-Liquid Cyclone Separator
Authors: Ye Chao , Wang Fang , Yuan Tao , Wu Hao
Published: August 2011

Computational methods of some pressure-drop models for a gas-liquid cyclone separator of refrigeration system are analyzed. And different pressure-drop models of pneumatic tube concerning several types of cyclone separator were calculated and verified. The result shows that for a smooth wall cyclone separator’ pressure drop, at the low concentration, the simple pressure drop model is sufficient. But when the wall is rough, it is better to use Barth and Muschelknautz model and the Stairmand model is more accurate to calculate the frictional factor.
Modeling and Vibration Analysis of Hub-Flexible Beam System Carrying a Payload with Rotary Inertia
Authors: Chen Si Jia , Zhang Ding Guo
Published: August 2011

The rigid-flexible coupling dynamics of a hub-flexible beam system carrying a payload with rotary inertia is presented. Both the transversal deformation and the longitudinal deformation of the flexible beam are considered. And in the total longitudinal deformation the non-linear coupling term, also known as the longitudinal shortening caused by transversal deformation, is considered. The approach of assumed modes is used to describe the deformation of the beam. The rigid-flexible coupling dynamic equations of the system are established via employing the second kind of Lagrange’s equation. Solving for this mathematical model, we can obtain the dynamics of the system. Then the natural frequencies are studied though the transversal bending vibration analysis. The natural frequencies are shown to be proportional to the angular speed ratio and the hub radius ratio, inversely proportional to the payload mass ratio and the rotary inertia ratio. When the angular speed ratio increases up to a certain value, the longitudinal deformation will also have an obvious influence to the transversal bending vibration.
Simulation and Study of Random Loads on Continuous Miner Cutting Drum
Authors: Li Xiao Huo , Yu Xin Wei , Ma Xiao Hong , Zhao Ying Bo
Published: August 2011

In order to study characteristics of loads on a cutting drum of a continuous miner, a mathematic model of random loads on the drum is set up in the paper by means of defining probability distributions of three-direction loads, loads and their variations on a cutting drum are given by building a computer simulation program when it cuts pure coal, rock and hard parcel. Results show that swing resistance is the greatest, forward resistance is the second, axial resistance is the least; a cutting resistance torque increases with the increase of broken media strength; loads cut stone layer are much larger than pure coal; range of load change and load fluctuations are big as cutting hard parcel, these conclusions are correspond with the actual situation.
Nonlinear Modeling of Linkage Mechanism with Clearances and Precise Control
Authors: Zhou Wei Min , Xue Shao Wen , Wang Xiang Jiang
Published: August 2011

In the practice of mechanical systems, all kinds of motion pair have the clearance exercise. With high-speed, precision machinery and instruments are proposed higher and higher demands for precision , The nonlinear effect of mechanism clearance can not be neglected. As the mechanism with clearance is a strong non-linear systems, System modeling is very complicated, it is difficult to establish a more accurate model , using Linkage mechanism with clearance example to set up a mathematical model, proposed a new method of establishing such models, and construct an inverse model for the Linkage mechanism, and Open-loop with inverse model feed-forward compensator control was firstly performed to compensate Linkage. The results of test show that：This new modeling method greatly reduced the difficulty of solving problems and has higher precision; this inverse model feed-forward compensator has effectively reduced the non-linear error of the system and has improved the control precision of Linkage mechanism.
Research on Dual-Cones CVT Based on EHL
Authors: Dong Hui Li , Yuan Shi Hua , Wei Chao
Published: August 2011

A novel configuration of CVT that contains two cones located in the same shaft face to face is researched about the traction performance under high speed based on the theory of elastohydrodynamic lubrication(EHL). The effects of load, radii of curvature and slip-roll ratio on the traction characteristics and power transmission are analyzed. The results show that with increasing load the traction coefficient enhances close to linearly where the load is not heavy and the minimum film thickness decreases linearly when the inner wheel radii of curvature less than 0.085m. The leftmost position could transmit higher power. The power transmitted improves slightly as slip-roll ratio enhances in an appropriate range.
Space Robot Self-Assembling Parameter Analysis
Authors: Liu Tian Xi , Liang Lei , Cheng Wei , Zhao Yang
Published: August 2011

With the depth of space exploration and applications, the space robot self-assembling has become more and more important for space on-orbit service. Parameter analysis is an indispensable work of assembling process design. The dynamic model of the space robot with target is established firstly, then the Hertz model is introduced as the collision model between the docking link and the capturing cone, and the operational space control is applied to achieve the assembling operation control under the Cartesian space. Then the paper focuses on the discussion and analysis of the influences of the parameters such as the stiffness coefficient, friction coefficient, leading speed coefficient and vertical speed damping coefficient on the assembling characteristics. The simulation results would provide a basis for assembling control and parameter design and have an important academic value and engineering significance on space service.
Kinematic Analysis of Clamping and Rotating Mechanism
Authors: Chai Fu Jun , Xu Jin You
Published: August 2011

In order to realize accurate rotation of steel pipe in automatic rolling pipe bender, a tilt cylinder six bar mechanism driven by pneumatic cylinder was presented. Based on the analysis of mechanism motion’s state, the motion process was divided into three working stages: clamping, rotating and loosening back. And kinematics parameters in every phase of the mechanism were obtained by complex number vector method, furthermore the mechanism kinematics characteristics of the whole process were gained. The results of the simulation example indicated that the mechanism has less change in velocity and more smooth motion during clamping and rotating stages.
Interference Determination for Parallel Cable-Driven Robots
Authors: Su Yu , Mi Jian Wei , Qiu Yuan Ying
Published: August 2011

This paper develops an approach to overcome the misjudgment and omission problems of determining interference for parallel cable-driven robots, which is essential to clear interference classification in the first place. According to the clear classification, interference condition between a cable and a cable or a cable and an edge of the end-effector has been derived according to all kinds of position relations between the feet of the common perpendicular; the on a cable with a plane of the end-effector has been proved. Compared with the existing approaches, the proposed method can determine the interference region more reasonably.
Synthesis of 2T1R Decoupled Parallel Manipulators
Authors: Lu Wen Juan , Zhang Li Jie , Zeng Da Xing , Wang Ruo Song
Published: August 2011

For the general parallel mechanisms(PMS), since the coupling between kinematic chains, the nonlinear relation between the input and output is presented, which have led to difficulty in the trajectory planning and precision control. Design of motion decoupled parallel mechanisms(DPMS) has become a good new topic in this area and has captured researcher's attention. In this work, the approach to a synthesis of three degree-of-freedom(3-DOF) DPMS is considered based on screw theory and motion synthesis ideas. Criterions for type synthesis of the branches for DPMS is established according to the twist screw system of the limbs, which assures the decoupling in each limb. Then a six-step procedure is presented for the type synthesis of 2T1R decoupled mechanisms.
Upper Limb Kinematical Model and Motion Analysis Method Study
Authors: Wang Xin Ting , Zhang Jun Xia , Yin Li Ping
Published: August 2011

A 7-DOF upper limb kinematical model is built based on Rigid Body Assumption method. A protocol is proposed to measurement and analysis the motion of upper limb using the optical capturing system and a new refined spatial kinematical Parameters algorithm. 13 basic actions of Activity of daily life (ADL) are studied based on the kinematical model and protocol.
Finite Element Analysis for Pin-Hole-Output Mechanism of FA Cycloid Drive Based on ANSYS
Authors: Lei Lei , Tao Ying , Guan Tian Min
Published: August 2011

In order to validate the pin-hole-output mechanism of FA cycloid drive force analysis theory, and based on the study on the basis of the contact problem, this article used the international advanced finite element analysis software ANSYS, established the output dowel pin and cycloid gear pin hole's contacting finite element model, and analyzed the static three-dimensional contact analysis. The calculation results coincided with the proposed pin-hole-output mechanism with gap dynamic stress analysis method, proved the correctness of the stress analysis theory.
Analysis of the Drive of AT Based on the Lever Method
Authors: You Ming Fu , Li Zhi Wei , Li Jiang Jiang
Published: August 2011

The rotation speed and drive scheme with 01M and ZF 6-speed automatic transmission were analyzed intuitively based on lever method, the design reasonableness of transmissions scheme was verified with 01M automatic transmissions from three angle of design as well; Meanwhile, the leverage method was extended, the transmissions of ZF 6-speed AT were analyzed based on the lever method extended too.
Open CNC System for Winding Machines
Authors: Tao Jian Hua , Liu Hua , Liu Xiao Chu
Published: August 2011

This paper introduces a new open CNC system for winding machines which can overcome the shortcomings the traditional winding machine existed, such as the low control-accuracy, the low speed and the poor quality of its product. The system takes Microprocessor MC68HC000 as the core and its working mode is centralized control and time-sharing processing. The highest drive pulse of the system reaches 500 KPPS and the drive aufloesung can be as high as 0.001mm/Pulse. So, the system software, together with the winding machines’ development kits and operating software, can provide an open design platform of the controller for the winding machine, and it may cater to the market’s needs for winding machines
An Electrical Parking Brake System Design and Analysis
Authors: Huang Xiao Ci , Yang Jie
Published: August 2011

Electrical Parking Brake is a system comprises the temporary brake of driving and long-term parking brake, and controlled by electrical. This paper researches the electrical parking brake system which is in using and on developing, illustrates the design and control of electrical parking brake system, and simulates the braking effect. This Electrical Parking Brake can saves energy and reduces handle difficulty.
Development of Active Suspension System for a Pot Hole Using PID Controller
Authors: Senthilkumar Mouleeswaran
Published: August 2011

This paper describes the development of a controller design for the active control of suspension system, which improves the inherent tradeoff among ride comfort, suspension travel and road-holding ability. The developed design allows the suspension system to behave differently in different operating conditions, without compromising on road-holding ability. The effectiveness of this control method has been explained by data from time domains. Proportional-Integral-Derivative (PID) controller including hydraulic dynamics has been developed. The displacement of hydraulic actuator and spool valve is also considered. The Ziegler – Nichols tuning rules are used to determine proportional gain, reset rate and derivative time of PID controller. Simulink diagram of active suspension system is developed and analysed using MATLAB software. The investigations on the performance of the developed active suspension system are demonstrated through comparative simulations in this paper.
Application of CAD/CAE Technology in Hydraulic Excavator Working Equipment Analysis
Authors: Wan Li Rong , Wang Zai Chang
Published: August 2011

The paper first put CAD/CAE technology into the domain of hydraulic excavator research and exploitation. It was focused on the analysis of excavator working equipment with this technology. In the paper, mock-up solid model of excavator working equipment was established with Pro/ENGINEER software, the kinematics and the dynamics of the model was analyzed with ADAMS software and then the intensity analysis and structure optimization were done with ANSYS software. The conjoint analysis and simulation not only give full play to these three software's advantages, but also realize data sharing and enhance efficiency and precision of the analysis.
Space Optical Remote Sensor of the CAE Thermal Control Index Calculation Method
Authors: Li Li Fu
Published: August 2011

The thermal control indicators CAE methods of Space optical remote sensor are analyzed in the presented work. We sat up a thermal optical analysis model for space optical remote sensor. By assuming fully covered by in-orbit temperature load, and using the finite element method for thermal deformation analysis, we obtained the optical remote sensor surface deformation and displacement under various thermal loading. Using ZERNIKE polynomial, wave was fitted to obtain ZERNIKE polynomial coefficients which were incorporated into the optical system design. Using CODE V optical calculation software, heat-ray machines under elastic deformation of the system point spread function, transfer function (MTF), wave front differential (WFE) etc. were calculated. Image quality changes of remote sensors are discussed in variety assumed cases such as temperature loads of quality change. By repeated iteration, critical value of temperature fields meeting the design requirements are obtained for the optical system. Optical indicators were converged to the temperature field indicator, then reasonable indicators of thermal control for remote sensors were obtained. For the thermal control design, this method provided a reliable basis for design.
Static Modal Stiffness Sensitivity of the Frame under Full Vehicle Environment
Authors: Pan Shu Hua , Chen Yu Dong
Published: August 2011

Most of the component optimizations of trucks are limited to the individual component because of the complex coupling relations between components. Focusing on such difficult optimal problem, the conception of static modal stiffness was introduced and static modal stiffness sensitivity was defined. The method for computing static modal stiffness sensitivities was also developed. The proposed method was applied to the static modal stiffness sensitivities analysis of the frame of the truck under full vehicle environment. In the computations, a three dimension finite element model for full vehicle was established and the frame was divided into 13 superelements. The static modal stiffness sensitivities obtained can be used to improve the frame design.