bluuebunny/crossref_metadata_2025 huggingface dataset:
Precise Modeling of Arc Cylinder-Gears with Tooth Root Fillet
Authors: Cui Yan Mei , Fang Zong De , Su Jin Zhan , Liu Yuan Peng
Published: August 2011

Study on theory of generation processing arc cylinder-gears, machining cutter was designed by the blade fillet and the top tooth edge generating the tooth root fillet of arc cylinder-gears, to build the linear tooth-surface equation of cutter-gear and the position vector of blade fillet curvature center. The linear tooth surface equations and fillet tooth surface equation were derived based on coordinate transformation principle, meshing equation, meshing geometry principle and kinetic theory. The precise 3D model was established. It verifies the feasibility of generation processing the arc cylinder-gears and achieves smooth transition both working and fillet tooth surface of arc cylinder. It provides theoretical basis for tooth contact analysis, tooth bending stress and kinetic analysis, further offers accurate data to numerical control machining and systematically guides the experimental research and practical application.
Research on the Performance of Ba-Bearing Aluminoferrite Cement
Authors: Tan Wen Jie , Chang Jun , Ye Zheng Mao
Published: August 2011

This paper discussed the main clinker minerals and their optimal proportion of Ba-bearing aluminoferrite cement. The results show that the optimal sintering temperature is 1365°C. In XRD patterns, the diffraction peak of C2.75B1.25A3 and C4AF nearly disappear when the harden cement slurry hydrated for 3d at absent of gypsum. At the same time, a large numbers of hydration products like BaSO4 and CxAHy which including CAH10, C2AH8, C4AH19 and so on, appear in XRD patterns. So the hydration rate of Ba-bearing aluminoferrite cement is fast and the degree of hydration is high. These hydration products come into being a stable structural frame so that 3d compressive strength of the clinker can reach to 73.3MPa.
Texture and Ductility of Ni3Al Foils
Authors: Demura Masahiko , Xu Ya , Hirano Toshiyuki
Published: August 2011

This article presents the texture evolution and the ductility improvement of the cold-rolled foils of boron-free Ni3Al during the recrystallization and the subsequent grain growth. The cold-rolled foils had sharp {110} textures. After the recrystallization at 873K/0.5h, the texture was disintegrated with several texture components. Interestingly, most of them had a single rotation relationship. i.e. 40˚ around <111>. With the progress of the grain growth, however, the texture returned to the sharp, cold-rolled textures. This two-stage texture evolution, called as “Texture memory effect”, was explained assuming a high mobility of the grain boundary with the 40˚<111> rotation relationship. The texture returning was highly effective to improve the ductility of the foils.
Facile Synthesis and Properties of CdxZn1-xSe Alloy Nanocrystals
Authors: Zhang Rui Li , Liu Ning , Yuan Zhi Min , Yang Jie , Zhang Yu Lan , Zhang Ai Yu , Cao Yong Qiang , Zhu Yuan Na , Yang Ping
Published: August 2011

CdxZn1-xSe alloy nanocrystals (NCs) were successfully synthesized by an organic route using oleic acid as a capping agent. The molar ratio of Cd/Zn strongly impact on the PL properties of the alloy NCs. The PL peak wavelength of the alloy NCs was 565 nm at the Cd/Zn molar ratio of 0.05 while their wavelength became 621 nm in the case of the molar ratio of 1. The average lifetime of the alloy NCs increased with increasing the Cd/Zn molar ratios (26 ns for a ratio of 0.05 and 45 ns for a ratio of 1). The X-ray diffraction analysis indicated that the alloy NCs revealed a cubic structure. The Cd/Zn molar ratio drastically affected the crystal structure of the alloy NCs which located between those of ZnSe and CdSe NCs.
Anatase Nano Titanium Oxide Synthesized Using the Hydrothermal Method and its Optical Absorption Properties
Authors: Fu Xiao Ming , Liu Zhao Wen
Published: August 2011

Anatase nano titanium oxide was synthesized with Ti(SO4)2 as titanium source and stronger ammonia water as precipitant using the hydrothermal method. The samples were characterized by XRD, SEM, TEM and UV-VIS. The results showed that the influence of the increase of the reaction time on as-prepared anatase nano titanium oxide was not obvious when stronger ammonia water was not added to Ti(SO4)2 solution. Anatase nano titanium oxide became small markedly under the same conditions when stronger ammonia water was added to Ti(SO4)2 solution. Anatase nano titanium oxide of about 20 nm in the diameter was obtained for 48 h with pH=9 at 240 °C by the hydrothermal method. That the size of Anatase nano titanium oxide particles became small was propitious to the blue shift of their absorption peak.
The Effect of Alcoholic Reducing Agent on Morphology and Structure of VO2 (B) Nano-Particles
Authors: Qi Ji , Niu Chen
Published: August 2011

Vanadium dioxides (VO2) is synthesized by hydrothermal method. In this process,V2O5 powder is used as raw materials,cetyltrimethylammonium bromide (CTAB) is used as template and different alcohols such as methanol, ethanol, propanol and butanol are used as reductants. X-ray diffraction (XRD) and scanning electron microscopy (SEM) are used to test the properties of VO2 nanoparticles. The results show that VO2(B) nano-particles were succsessfully synthesized under the conditions of thermal reduction temperature 180°C, reaction time 24h and drying temperature 60°C. The variety of alcoholic reducing agents plays an important role in the structure and morphology of the product VO2(B), which relates closly to the electric properties of materials.
Photoluminescent Properties of TGA-Capped CdTe Quantum Dots
Authors: Yuan Zhi Min , Yang Jie , Zhang Yu Lan , Zhang Rui Li , Liu Ning , Cao Yong Qiang , Zhang Ai Yu , Zhu Yuan Na , Yang Ping
Published: August 2011

An environmentally friendly synthesis was developed to fabricate aqueous CdTe quantum dots (QDs) using thilglycolic acid (TGA) as a capping agent. Optimal preparation conditions including pH (11.2) and TGA/Cd molar ratio (1.5:1) resulted in CdTe QDs with high photoluminescence (PL) quantum yield up to 56%. The TGA-capped CdTe QDs exhibited tunable PL from green to red. Lifetime measurement indicated that the average lifetime of the TGA-capped QDs increased with increasing their sizes (27.5 and 37.2 ns for the QDs with PL peak wavelength of 607 and 636 nm, respectively). The PL of the QDs revealed the dependence of temperature, in which the QDs exhibited a red-shifted PL peak with increasing temperature. Such PL behavior depended strongly on the QD sizes.
Influence of Different Processing Parameters on the Structure of Anodic Aluminum Oxide Membrane
Authors: Sun Xiao Lin , Li Ai Min , Dong Wei Fang , Sun Kang Ning , Du Ming , Wang Wei Li
Published: August 2011

Oxide membranes are one kind of porous materials with many nano-sized pores. In our work, the two-step anodization method was used to fabricate Anodic aluminum oxide (AAO) membranes. The surface, cross-section micrographs and chemical composition were analyzed by field emission scanning electron microscopy (FESEM). From the FESEM micrographs, it can be easily seen that the self-ordered hexagonal pore channels were parallel and perpendicular to the surface of membrane when AAO membrane was prepared in oxalic acid at 0.2mol/L for 4h. In addition, the biggest pore diameter was 78nm, and the thickness ranged from a few microns to tens of microns in the suitable preparation parameters.
Study on Amorphization of Mechanical Alloyed Cu50Zr40Ag10 Alloy
Authors: Xia Lin Yan , Wang Yan
Published: August 2011

The amorphization and crystallization of mechanical alloyed Cu50Zr40Ag10 alloy have been investigated using X-ray diffraction (XRD) and differential scanning calorimetry (DSC). The results demonstrate that a full amorphous phase of Cu50Zr40Ag10 can be obtained through mechanical alloying. The amorphous phase begins to show the initial mechanical crystallization when the milling time is 108 h and subsequently the main milling product is still amorphous structure with increasing milling time up to 208 h. Therefore, the amorphous alloy exhibits the excellent mechanical stability during mechanical alloying. The nearest-neighbor distance of atoms firstly increases then reduces with the increasing milling time, indicating that there is a closely correlation between the initial crystallization behavior and short range ordering.
Numerical Simulation of Dense Phase Pneumatic Conveying Gypsum in Stepped Pipeline
Authors: Wu Wei Xiang , Liu Zong Ming , Duan Guang Bin
Published: August 2011

The process of dense phase pneumatic conveying gypsum in stepped pipeline was simulated by using an Euler-Euler two fluid model of dense gas-particle two phase flow based on the kinetic theory of gas and granular. The simulation results showed dynamic pressure increased while static pressure decreased in the first two tapered pipe, but this trend became opposite in the last diffuser pipe. The gas and particle velocity both increased in the 80-65mm and 65-50mm tapered pipe, but decreased in 50-80mm diffuser pipe. In a short, the results showed that the simulation was consistent with the fact, which proved the feasibility of our simulation.
Ecological Barium-Crystal Glass Based on Thailand Quartz Sands Doped with Zirconium Dioxide
Authors: Won-In Krit , Pongkrapan Sorapong , Dararutana Pisutti
Published: August 2011

Ecological crystal glass with no toxic compounds, especially lead, was based on soda-lime-silica glass that fabricated mainly from 50 wt% local dressing sand, 22 wt% barium carbonate and doped with various concentrations of zirconium dioxide. Density (ρ), refractive index (RI), thermal expansion coefficient (CoE) and hardness (HV) were measured. It was found that the values of ρ, RI and HV increased linearly as the increasing of zirconium dioxide contents, whereas the CoE was decreased. This type of glass was ecologically friendly material.
Experimental Study on Uniaxial Time-Dependent Cyclic Deformation of POM/PTFE Blends
Authors: Zhu Zhi Wu , Liu Xu , Kang Guo Zheng , Cai Li Xun
Published: August 2011

The uniaxial time-dependent cyclic deformation of POM/PTFE blends was studied experimentally under the stress-controlled and strain-controlled loading. The volume fraction of PTFE in the POM/PTFE blends was 20%. It was shown that the creep behavior of POM/PTFE blends is better than that of POM. In the cyclic strain-controlled experiments, the responded stress amplitude has a close relationship with the applied strain amplitude and strain rate. As a result of stress relaxation, the responded stress amplitude decreases as the hold time at peak strain increases. Ratcheting occurs in the blends subjected to asymmetric stress-controlled cyclic loading, and the ratcheting strain depends on the applied stress amplitude and stress rate. Hold time at peak stress and low stress rate lead to an increased ratcheting strain. The POM/PTFE blends will fail as the hold time at peak stress is longer than a critical value.
Two Novel Tetrahedrally Silicon-Based Benzimidazole Derivatives: Potentials as Blue Emitters for OLEDs
Authors: Ma Qing Yu , Guan Rui Fang , Li Guo Zhong
Published: August 2011

Two novel silicon-centered benzimidazole derivatives, Bis(4-(benzimidazol-1-yl)phenyl) dimethylsilane (1) and Bis(3-(benzimidazol-1-yl)phenyl)dimethylsilane (2) have been synthesized and determined by IR, 1H NMR, 13C NMR and mass spectroscopy. These compounds have high thermal stability and are fluorescent with emission in the region of violet to blue, which could be potentially applied as blue emitters in organic light-emitting diodes (OLEDs) display.
Synthesis and Properties of Poly(3,4-Ethylenedioxythiophene) via Solid-State Polymerization
Authors: Chen Shu Ai , Xu Jing Kun , Zhu Dan Hua , Duan Xue Min
Published: August 2011

Conducting polymer poly(3,4-ethylenedioxythiophene) (PEDOT) has been synthesized by solid-state polymerization of 2,5-diiodo-3,4-ethylenedioxythiophene under normal conditions. The resulting iodine-doped PEDOT is completely insoluble in common organic solvents and retained partial crystal structure of monomer as indicated by scanning electron microscopy. Electrical conductivity measurement showed that PEDOT exhibited conductivity in the range of 0.16–0.23 S/cm (pressed powder pellet) with temperature dependence. Thermogravimetric and differential thermal gravimetric analysis of PEDOT indicated that its main chain was stable up to ca. 200 °C.
Preparation of Sizing Agents for Carbon Fiber Adapt to Various Polymer Matrix
Authors: Chen Juan , Liu Jian Ye , Wang Dong Zhi , Zhou Xin Rui
Published: August 2011

Emulsion type sizing agent for carbon fiber was synthesized using epoxy resin (E-51) and epoxidized polybutadiene (EPB) by adding emulsifiers and other additives. Standing stabilization of sizing agents was analyzed. Meanwhile, abrasion resistance, fluffs and breakage, stiffness were used to analyze the processability of carbon fiber. The effect of sizing agents on interfacial adhesion of carbon fiber/resin composites was estimated by interlaminar shear strength (ILSS). The results showed that the sizing agent could significantly improve processability of carbon fiber due to the increase of abrasion resistance and reduce of fluffs and breakage. By adding EPB in sizing agent and adjusting the ratio to E-51, the flexibility of carbon fiber was ameliorated and the sizing agent could adapt to various resin matrices. Compared to the desized carbon fiber reinforced composite, ILSS of sized carbon fiber/epoxy resin composite was increased by 16.9%, and ILSS of sized carbon fiber/vinyl ester resin composite was enhanced by 19.1%.
Shape-Memory NiTi Foam Synthesized by CIP and Sintering with NaCl Space-Holders
Authors: Hou Hao Wen , Wei Wen Ting , Chen Zhi Xuan
Published: August 2011

For bone implant NiTi foams with a structure (69.3-69.9% porosity and 150-400μm pore size) were fabricated by CIP and sintering with NaCl space-holders. A maximum compressive strength of 30.90Mpa and a ultimate compressive ductility of 33.5% were obtained. Moreover, 81-89% of the strain recovered after inducing shape-memory effect. In particular, the pores completely replicate the shape and size of the NaCl powders. It provides a powerful tool to tailor the pore structure and mechanical properties of NiTi foams to match the demand of bone implant. Simple processing route and low cost allow these foams to be a suitable candidate for bone implant applications.
Surface Modification of Cornstalk Fiber and Properties of Cornstalk Fiber/Gypsum Composites
Authors: Wang Yu Yin , Li Guo Zhong
Published: August 2011

Cornstalk fibers were modified with surface modification and the properties of cornstalk fiber/gypsum composites was studied. The results showed that mechanical properties of cornstalk fiber/gypsum composites were enhanced by adding unmodified cornstalk fibers, but composites waterproof performance was decreased greatly. Through surface modification on cornstalk fibers, composites mechanical properties were further enhanced, and composites waterproof performance was improved obviously. The mechanism of surface modification was discussed, and the model of interfacial zone between modified cornstalk fiber and gypsum matrix was proposed.
Fractural Research on Ti2AlC/TiAl Compound Materials
Authors: Li Yang , Yue Yun Long , Zhang Hai Tao , Wen Ming
Published: August 2011

The SEM images of Ti2AlC/TiAl materials with different samples showed different fractal dimension.In Multi-fractal spectrum, the parameter is calculated by the multi-fractal spectrum theory. Without r=0.00625, giving rise to the small fluctuate, lnχq(r) and lnr shows the well linear relationship in spite of the value of q. τ (q) and q show nonlinear relationship and the protuberance existed in q∈[-3,-1], D(q) and q turn to be more steep, at last the clock shape relationship between the α and f(α) reveals the good symmetry of spectrum, uneven distribution of the fracture, multi-fractal feature clearly.
New Method for Blank Expansion of Rectangular Box
Authors: Zhou Liu Ru , Wan Hai Ming
Published: August 2011

The principle of NC incremental sheet metal forming as well as the process planning, experiment of the square conical box forming are presented. Because the deformation of sheet metal only occurs around the tool head and the deformed region is subjected to stretch deformation and thins, and surface area increases. Sheet metal forming stepwise is to lead to the whole sheet metal deformation. The sine law indicates that the thickness of the square conical box wall is close to zero when the half-apex angle of the square conical box wall is close to zero. Therefore, we must know the forming limit half-apex angle to ensure that the forming can be carried out successfully, i.e., to ensure that the deformed region with a certain thickness will not fracture. It will succeed in square conical box incremental forming in a single tool-path if the forming is carried out with an angle which is larger than the forming limit half-apex angle. The fracture in the forming component can be avoided by these methods. A square conical box of uniform wall-thickness can be formed by NC incremental forming process. The thickness of deformation area is increased by increasing half-apex angle. The wrinkle in the forming component can be avoided by these methods.
Novel Design of MOCVD Reactor with Three Radial Inward Flows for Epitaxial Growth of GaN Thin Films
Authors: Yang Liao Qiao , Hu Jian Zheng , Chen Zun Miao , Zhang Jian Hua , Li Alan G.
Published: August 2011

In this paper, a novel super large metal organic chemical vapor deposition (MOCVD) reactor with three inlets located on the periphery of reactor was proposed and numerical evaluation of growth conditions for GaN thin film was characterized. In this design, the converging effects of gas flow in the radial direction could counterbalance the dissipation of metal organics source. CFD was used for the mathematical solution of the fluid flow, temperature and concentration fields. A 2-D model utilizing axisymmetric mode to simulate the gas flow in a MOCVD has been developed. The growth of GaN films using TMGa as a precursor, hydrogen as carrier gas was investigated. The effects of flow rates, mass fraction of various species, operating pressure, and gravity were analyzed and discussed, respectively. The numerical simulation results show all the fields distributions were in an acceptable range.
Electopolishing of P-Type Silicon Thin Films in Hydrofluoric Acid Solutions
Authors: Hu Fei , Chen Yu Wei , Wang Xiao Dan , Li Xiao Hong
Published: August 2011

Anodic dissolution on p-type silicon thin film in hydrofluoric acid solutions leads to a reduction of roughness on these surfaces. The electrochemical behavior in different HF concentration is investigated by linear sweep scan, and it is found that the HF has an important role in electrochemical behaviors, and the anodic dissolution rate increases with increasing HF concentration. A smooth surface state can be obtained in HF solutions, and the technique is promising for fabrication of reflecting silicon surfaces.
Frequency Topology Optimization and Lightweight Design of High-Speed Turning Center's Slide Board
Authors: Zhang Zhi Wei , Zhang Wei , Song Jin Chun , Li Song
Published: August 2011

This paper focuses on a general weight lightening method of machine tool's key moving parts based on frequency topology optimization and dimension optimization using Ansys workbench and Ansys classic interface. First, preparations of frequency topology optimization, including setting material, applying constraints and loads, meshing of the high-speed turning center HTC2550hs slide board were done in Ansys Workbench; Second, frequency topology optimization was performed in Ansys classic interface, and the preliminary light weighted model of the slide board was obtained; then, for important parameters of the removal parts that affect slide board's dynamic performance much, dimension optimization was performed. Finally, we achieve that the slide board's weight is reduced by 11.03%, while its first and second natural frequencies are increased.
Research on Welding Cracks Prevention in the Fuel-Lubricating Oil Heat Exchanger of Aeroengine
Authors: Yang Kun Yu , Xu Xiao Jun , Qu Hong Yi , Lai Rui Lin
Published: August 2011

Cracks were occurred in welding lines at An Aero engine fuel - oil heat exchanger and oil spills were caused. But shortly, after welding cracks, cracks emerged again and severely threat to flight safety. To improve the overall damping by using new developed shock absorber, and alter the distribution and peak of stress at dangerous parts to prevent cracks by using a prevention program which consisting of two measures: vibration damping and partial damping treatment at the cracks particle which are prone to dangerous parts, were proposed in this paper and for analyze the damping effect, vibration test and compared were used. The results show that the prevention program can effect reduce the peak of stress at the risk of cracks particle which are prone to dangerous parts, and it is certain significant for how to repair and prevent the weld cracks at fuel - oil heat exchanger.
An Innovative Design Based on CAD Environment
Authors: Zuo Zhi Hao , Xie Yi Min , Zhao Bang
Published: August 2011

The mathematical development of structural topology optimization provides a mature tool for design optimization, although the application is still very limited in engineering practice. This paper intends to study the application of topology optimization in industrial design via commercial CAD software interfaces. An innovative numerical procedure for this purpose is introduced based on convenient CAD modeling interfaces. As an instance, the B-spline based environment Rhinoceros3D features the modeling module for the optimization procedure, in collaboration with an additional optimization engine BESO3D. The topology optimization is realized based on the CAD model from Rhinoceros and outputs the optimal solution into Rhinoceros after computation. Further interpretation of the optimization results is discussed within the framework of Rhinoceros. Design applications of the modeling-optimization design integration are showcased as the examples to demonstrate the efficiency and robustness of topology optimization in industrial design.
Design Method to Energy-Saving Reconstruction for Existing Public Building in Northern Area of China
Authors: Liu Qi Bo
Published: August 2011

The energy consumption of per unit area in public building are larger than the residential building in China, and the energy-saving reconstruction for existing public building is less than the residential building at present, so it also have great potential and space of energy conservation. This paper based on the feature of climate and energy consumption of existing public building, formulated the evaluation principle of energy-saving reconstruction technology, put forward from economy, energy-saving effectiveness, advance and combination property of technology to determine the design method to energy-saving reconstruction, to select appropriate technology. At last, this paper through a case building---a teaching building in Xi'an to analysis how from specific problems to apply appropriate technologies in northern area.
KKM Type Theorem and Ky Fan's Inequalities in Abstract Convex Spaces
Authors: Tang Gu Sheng
Published: August 2011

In this paper, we first prove some type theorem based on the F-KKM mapping and generalized F-KKM mapping in abstract convex space. From this, we establishsome Ky Fan's inequalities.
The Robot Target Recognition Based on Support Vector Machine and D-S Evidence Theory
Authors: Zhu Meng Si , Zou Xiang Jun , Chen Li Juan , Zou Hai Xin , Chen Ke Yin
Published: August 2011

Aiming at the problem of low recognition rate and easy affected by environment during the process of robot target recognition in complex environments, the target recognition method combining support vector machine (SVM) with D-S evidence theory was proposed. Taking citrus recognition as an example, SVM was used by the method to local classification according to citrus color and geometry feature information respectively, and the results of SVM were transformed to probability outputs through Platt model, and treated them as the basic probability assignment (BPA) of D-S evidence theory to reason and fuse local recognition results, and then realized the combination of SVM and D-S evidence theory in citrus recognition, finally improved the recognition rate. The experimental results showed that: the recognition rate of the method combining SVM with D-S evidence theory and integrating color features and geometry features was higher than SVM method with only color or geometry features.
Simulation of Radiation Damage for the Typical Tritium Permeation Barrier Coating Materials
Authors: Zhu Bin , Zhang Yi Sheng , Hu Jian Gong , Yang Hong Guang , Zhan Qin
Published: August 2011

The study of tritium permeation barrier (TPB) coating is one of the most important subjects in the development of liquid lithium blankets in International Thermonuclear Experiment Reactor (ITER). Radiation-shielding property is one of the most important assessment indicators of TPB coating materials. Radiation damage experiment is difficult to perform, so with the Monte Carlo code TRIM(Transport of Ions in Matter), simulations of proton irradiation have been done for three kinds of candidate materials-Al2O3, Er2O3, Y2O3.This study focuses on the energy transfer, energy loss, and vacancies of the protons, as well as the stopping power of coating materials. According to the calculation results, Al2O3 has the strongest resistance against tritium permeation while more vacancies are produced after proton radiation.
A Slicer Control System Based on PLC and Servo
Authors: Zhang Xi , Liu Guo Qing , Lv Qi Bing
Published: August 2011

The slicer control system designed for production plants to manufacture flap disks was investigated using programmable logic controller (PLC) and servo. This system has been mainly developed to achieve the automatic flaps’ cutting and setting. It is implemented by a PLC, a human-machine interface(HMI), a positioning module, and senors, as well as servo amplifiers and motors. In the present work, the effect of response time on multi-axis synchronization has been studied. It was shown that the use of parameter adjustment allows the obtainment of reliable operating characteristic and permits one to enormously improve the accuracy of feeding length and rotation angle. The control system has been provided for industrial applications.
An Improved TRIZ-CBR Model for Rapidly Innovative Design
Authors: Hu Zhuo , Zhao Yong , Chen Yang , Xiang Dong
Published: August 2011

G. Cortes Robles’ TRIZ (Russian acronym for “Theory of Inventive Problem Solving”)–CBR (Case-based reasoning) model has the capacity to accelerate conceptual design and to find inventive solutions. This paper describes how the TRIZ–CBR model can be enhanced by introducing the weight sensitivity. Of course, weight used to measure the relative importance of multiple attributes is a very important component of the similarity function, which has a great influence on the CBR results. By means of weight sensitivity analysis, the similar cases which possess high reference value among retrieved cases can be selected. A laundry drum product example was given to verify the validity of the model.
Dynamic Fault Tree Based on Weibull Distribution
Authors: Guo Wei Gang , Han Wei , Liu Shu Yan
Published: August 2011

The fault tree analysis is a widely used method for evaluation of systems reliability and safety. Dynamic fault tree (DFT) extend traditional FT by defining additional gates called dynamic gates to model these complex interactions. Markov models are used in solving dynamic gates. However, state space becomes too large for calculation with Markov models when the number of gate inputs increases. In addition, Markov model is applicable for only exponential failure and repair distributions. But in engineering, the failure mode is mostly obeyed to weibull distribution for mechanism and electronic units. Combined the weibull distribution and Markov model, this paper presents dynamic fault tree quantitative analysis method based on weibull distribution.
Non-Contact Energy Transfer Based on Ultrasonic
Authors: Zou Yu Wei , Huang Xue Liang , Bai Yang
Published: August 2011

This paper proposed a new method of non-contact energy transmission based on ultrasonic. Firstly describes the work principle of ultrasonic non-contact power transmission, and establishes the model of the system by way of the equivalent circuit, and the system was theoretically analyzed in detail. Then the interface circuit was proposed, and the maximum load power is analyzed. The experiment results show that the energy can be efficiently transmitted within effective distance, indicating that the method has some practical value.
The Design of High Pressure Wellhead’s Spool Base on the Autofrettage
Authors: Li Mei Qiu , Duan Meng Lan , Huang Yi , Zhou Si Zhu
Published: August 2011

The problem facing of spool used in high pressure wellhead is illustrated. The methods and steps of conventional design and autofrettage design for spool are introduced. Based on the 4rd strength theory, the wall thickness of spool under 103.5MPa is designed using the two methods. Compared with the conventional design, the wall thickness of spool is declined 16.6%, the gross weight is 60% of previous, the stress distribution is more uniform and the utilization rate of raw materials is increased by autofrettage. Thus it provides a theoretical basis for design of spool used in high pressure wellhead.
The Fault Tolerable Control System Structure of SY-II Remote Operated Vehicle
Authors: Huang Hai , Wan Lei , Li Yue Ming , Pang Yong Jie
Published: August 2011

In order to improve the Remote Operated Vehicle (ROV) into a reliable and maintainable one, this paper has presented a fault tolerance control system structure. Its surface platform includes fault diagnosis and tolerance modules. In fault diagnosis module, a second order sliding mode observer has been built on the basis of its dynamic model, so as to diagnose the thrusters’ conditions through the residue of command quantity. Coresponding with its thrusters’ position, a force allocation model has been established to realize fault tolerable control. Based on duality priciple, the energy-like function concerning ROV control is established. On the basis of the energy-like function, the recurrent strategy has been deduced for thrust allocation when some of thrusters are found failure. Simulations and experiments have been made to verify and analyse the control system structure. They have proved the SY-II control architecture is a reliable control system, it can detect the thruster fault precisely, realize fault tolerable control.
Study of Three-Dimensional Wall Effects on Micro Nozzle’s Performance
Authors: Tong Jun Jie , Cen Ji Wen , Xu Jin Liang
Published: August 2011

According to the lever moment equilibrium, the thrust test is performed for a flat micro convergent-divergent micro nozzle with 11.72 geometry expansion ratios. During the test process, since the distances between the Piezoelectric sensors point and the bearing point are much larger than the distance between the nozzle and the bearing point, thus the thrust signal is amplified. Compared with the test results, the FLUENT6.1 software is also applied to compute steady two-dimensional and three-dimensional Navier-stokes equations for numerical results by parallel computing. The numerical results and test results show that： for the flat micro nozzle with small ratio of throat depth and width, three-dimensional wall effects are not negligible. Three-dimensional numerical results agree well with the test results while there are large differences between two-dimensional numerical results and test results. With the throat Renaults being increased, the corresponding differences between two-dimensional numerical results and test results decreased accordingly
Establishing Key Integration Factors for Integrating Engineering and Sustainability
Authors: Lee Kuan Pei , Chang Andrew S
Published: August 2011

This study established the key integration factors (KIFs) to help participants to scrutinize the key issues during incorporating sustainability issues into engineering development projects. Firstly, Sustainability disputes in one case project were reviewed to understand their evolvement and to analyze the dispute. The key factors were identified by comparing other two types of integration cases. Secondly, focused interviews were conducted with practitioners to scrutinize the eight KIFs by analysing the interviewed opinions to ensure its applicability. The study results show that the eight KIFs were consistent with the key issues in the integration practice. These factors can remind the integration team to check the data quality, choose the appropriate assessment techniques, communicate with stakeholders, invite qualified experts , and then achieve consensus in the integration process.
A Method to Obtain the Position of Space Object Based on Monocular Vision and Laser Ring
Authors: Yin Nan , Zhu Xing Long , Zhao Xin , Gao Shang
Published: August 2011

When the cylindrical laser shines on the target object, a spot can be obtained, which the edge is a closed curve, marked as C1. The imaging of the curve C1 on the image surface of CCD is a closed curve C2 too. Coordinate system is established to describe the position relationship among camera, image and light source, and to analyze the principle for monocular vision and laser ring to get the information about the object depth. In order to solve the problem and make the above principle clear, the key is to work out the expression for the curve C2 on the image surface of CCD. In order to calculate the closed curve C2 expression, the curve C2 will firstly be divided into two parts, the upper curve and the lower one. According to least-square polynomial, discrete points on the curves of two parts are drawn out, constraints are established and the curve equations are fitted. Then, to verify practicality of this method, a virtual model scene will be created, through which relevant data describing edge of virtual CCD image and that of a virtual spot when the virtual light source alights on the virtual object will be obtained. At last, closed curve equation will be fitted in accordance with data describing edge of virtual image; the position of space object will be fixed by making use of light source equation and closed curve equation; and a contrast will be made between the calculated value and data of the spot edge to prove whether a method to obtain the position of space objects based on monocular vision and laser ring is feasible.
Optimization of Technology for Virgin Coconut Oil Microencapsulation by Response Surface Methodology
Authors: Huang Yu Lin , Deng Sheng Min , Chen Wei Jun , Xia Qiu Yu , Li Rui , Zhao Song Lin
Published: August 2011

Virgin coconut oil (VCO) microencapsulation technology was developed by spray drying method and the technology was optimized by response surface methodology. Soybean protein isolates (SPI) and maltodextrin were used as wall materials, sucrose esters (SE) and glycerin monostearate (GMS) were used as emulsifiers. Plackett-Burman(PB) design and Box-Behnken (BB) design were applied to screen and optimize influential factors in the process of microencapsulaiton effcency(MEE). The PB design and statistic analysis showed that homogenization pressure, emulsifying time and inlet air temperature were three key factors in this process. Other factors were identified that the total solids concentration was 25%, the ratio of wall materials and core materials was 1:3, the ratio of maltodextrin and SPI was 1:1, the dosage of sucrose esters was 0.5%, and the emulsifying temperature was 40 °C. The quadratic model for three significant factors was established with the MEE as the target response by BB design and response surface analysis. The optimum conditions were as follows: emulsifying time was 60min, homogenization pressure was 40MPa and the inlet air temperature was 177°C. The MEE of microencapsulaiton virgin coconut oil (MEVCO) can reached 65.89% under the optimal conditions．
Defect Contour Matching Based on Similarity Measure for 3D Reconstruction
Authors: Fang Li Yong , Li Hui , Bai Jin Ping
Published: August 2011

Contour matching is one of the important problems concerned in 3-D reconstruction field. According to the difficulties of defect contour matching in defect modeling, a method based on similarity measure is presented in this paper. In this method, the theory of similarity measure is introduced to quantitatively describe the similarity of two contours. And the value of similarity measure is set as the criterion to judge matching relation between two contours in consecutive slices. For reducing computational complexity and improving accuracy of contours matching, a candidate matching field of contour is proposed. The efficiency of this algorithm has been verified by a typical example and satisfying results have been obtained.
The Technology Research on Milling Large-Size Spiral Bevel Gears of the Finger Cutter
Authors: Yang Lin , Wang Zhen Yu , Ren Shuai Nan , Wang Yuan Tao
Published: August 2011

This paper refers to the finger cutter forming method to process large-size spiral bevel gears by using processing principles, tools, processing technology and path equations. In the actual production process, the method is made a rapid development for the revolutionary innovative process of large spiral bevel gear. The method of research is different from the disc cutter, so the processing of large spiral bevel gears have a new processing method to achievement.
The Research of Polarization Feedback Control System Based on Double Mach-Zehnder Interferometer
Authors: Wang Yu Tian , Yuan Rui Rong , Wang Shu Tao , Gao Xue , Li Xue
Published: August 2011

Polarization induced signal fading always has an influence up on the visibility of the interference stripe and the accuracy of system location in the distributed optical fiber oil &gas pipeline leak detection system. Base on distributed sensor system polarization characteristic, this paper analyses the visibility of the interference stripe with the changing of polarization. Designed a feedback control system based on double Mach-Zehnder is used to eliminate the input light polarization fading. This system can effectively suppress the polarization fading in fiber optical sensor, making interferometer fringe visibility tends to 1 and the equilibrium state of input light polarization always closes to the best input sate of interferometer.
Study on Effects of Rack-Cutter Fillet on Meshing Strength of Involute Conjugated Internal Gear Couple
Authors: Zhou Hua , Song Wei
Published: August 2011

A research is made on the different influence on frame structure stiffness between straight board stairs and fold board stairs. The research is divided into two circumstances: independent framework unit and the overall framework. in each circumstance, there are four cases: frame without stairs, frame with straight stairs, frame with fold board stairs whose slow bedplate is located in the floor place, frame with fold board stairs whose slow bedplate is located in the middle platform, the horizontal floor displacement of four kind of frames in transverse and longitudinal direction under the same force. By comparing the four displacements, the influence of three different forms of stairs on frame structure stiffness can be got; the result shows that fold board stairs whose slow bedplate is located in the middle platform are better than straight stairs in seismic performance.
Digital Collaborative Design of Diesel Engine
Authors: Ji Shu De , Gao Bo , Pei Wei , Wang Wen , Zhang Hui
Published: August 2011

Based on diesel engine, the digital collaborative platform was designed. The key technology of supporting the platform was introduced. In addition, the principle of digital collaborative design was designed. For a diesel engine, the flow of design was introduced. In every step, the designed contents were determined. Compared the traditional design, the new design will have the shorter period and the better design quality.
A Novel Design of a Suspension System for Omni-Directional Electric Vehicles
Authors: Qiu Hao , Lei Zheng Bao , Qi Tom Zi Ming , Dong Zhu Rong
Published: August 2011

This paper is to present a new semi-suspension that is designed for Omni-directional four wheels-driven electric vehicles. With the use of band spring and lower cross arm this kind of suspension is characterized by the simply and compactly structure, flexible steering and better loading capacity. A prototype is designed and built based on the geometric model and mathematical description using Matlab.
Study on the Controllability of Complex Flexible Hydraulic Vehicle Robot System and its Dynamic Simulation
Authors: Ma Zhen Shu , Hao Jian Bin , Sun Hua Gang
Published: August 2011

Based on elastic dynamic model, an elastic dynamic controllable model of the vehicle flexible robot system was established. Regarding the low-order modes as the control modes, setting the boundary coordinates in the locations of the hydraulic actuator, the controllable state-space equations of the system was formed. A precondition for realizing system’s precise control is that the system is controllable. According to system’s controllability discriminant qualification, the influence of physical parameters on the controllability of system got broad discussed, and some reference data was obtained, which would be helpful for the next step to control the vibration. Aiming at the interference of the state-space equations, disturb distributing matrix was merged with input matrix, disturb vectors was merged with input vectors, a new state-space equation was established. By dynamic simulation, vibration response of the vehicle flexible robot system was achieved, and the experimental results showed that the treatment about disturb distributing matrix is feasible.
Modal Analysis of a Drilling Machine for Blades of Wind Turbines
Authors: Jiao Yong Shu , Zhang Yong Liang , Fan Mu Hui
Published: August 2011

In this paper, the authors conducted a modal analysis of a drilling machine for blades of wind turbines. A simplified model of the machine was established with a commercial FEM software package, Ansys. At a specific working position the first six order natural frequencies were calculated and the results obtained from two different contacting manners were compared. The influence of static structural stress induced by gravitational load on natural frequency was also evaluated. The variations of the natural frequencies of the machine with the position angle of the rotary box were subsequently obtained. This is helpful for the determination of range of the excitation frequencies.
Dynamics Simulation of Diesel Engine Piston pin Based on ADAMS and its Application in Fault Diagnosis
Authors: Xiao Hai Bing , Xie Xiao Peng
Published: August 2011

In this paper, ADAMS multi-body dynamics simulation was introduced in order to solve the diesel engine piston pin dynamics. Take diesel engine piston for example, the model of piston system was established based on ADAMS/Engine module. According to rotational speed of crankshaft, piston pin dynamics simulation was analyzed. Through Fast Fourier Transformation, piston pin power spectral density was got for piston pin fault diagnosis. The results show that simulation results are consistent with theory, dynamics simulation applied in fault diagnosis is feasible.
Dynamics Analysis of Gear Mesh of Transmission Based on Virtual Prototype
Authors: Wang Jia Fu , Wu Xun Cheng , Han Jing Tao
Published: August 2011

A commercial transmission provided by enterprise is analyzed in this paper. Its 3D model is established in UG software, its dynamic force and corresponding frequency diagram of constant mesh gear pair is analyzed in coupling mechanical system simulation(ADAMS). According to the result of analysis, the conclusion can provide basis for fatigue property, strength checking, structure optimization of gears and shafts, and noise abatement of global transmission. This method is an additional project for the stability, security of transmission products.
Comprehensive Dynamic Model and Vibration Characteristics of Step-Type Compound Planetary Gear Sets
Authors: Yang Fu Chun , Zhou Xiao Jun , Xie Ming Xiang
Published: August 2011

Step-type compound planetary gear sets are widely applied in vehicle systems. Comprehensive dynamic model of step-type compound planetary gear sets, which includes translational, rotational vibrations and static transmission errors, was established. Natural vibration characteristics of the system, such as natural frequencies and vibration modes, were analyzed. Belt shape distribution characteristics of its natural frequencies was researched. According to vibration characteristics of both central components and planets, natural vibration modes of the system are classified into three types: central components translational vibration and planets random vibration, central components rotational vibration and planets identical vibration, central components static and adjacent planets reverse vibration mode.
Research on Vehicle Dynamics Simulation for Driving Simulator
Authors: Tang Fang , Wei Yan Ding , Zhou Xiao Jun , Luo Zhu Hui , Xie Ming Xiang , Li Pei Xin
Published: August 2011

In order to fulfill the requirement of vehicle dynamics performance and real-time capability in driving simulator, modeling and simulation method of a four-wheeled vehicle model based on multi body dynamics software Vortex was studied. Fundamental construction and dynamics properties of the model such as body, chassis, wheels, power train, suspension and tyre model were described. The model was tested to simulate on the C grade of road. The results indicate that the model and simulation method can well represent vehicle dynamics performance and high real-time capability of simulation, and is worthy to apply to driving simulator in the future.
Finite Element Analysis of Elastic Membrane Coupling Based on MSC.patran
Authors: Shan Guang Kun , Zhang Hai Long , Wang Ying Bo , Zeng Cheng Zhi
Published: August 2011

The membrane coupling plays an essential role in the transfer process of the wind wheel torque. In order to meet the design requirements and get more accurate stress analysis state of membrane, based on the finite element software HyperMesh, membrane and the surrounding model is regularly meshed into hexahedral element, and to MSC.patran analysis platform, to check the strength of the coupling. The result of analysis showed that, the maximum stress and deformation of coupling can be met to the design standards and reach the requirements also. Using of hexahedral element, analysis time of CPU can be reduced and smoother stress and strain contours cloud can be also obtained, so it provides a more scientific basis for the design and manufacture of membrane coupling.
Contact Characteristics of Spherical Gear and Ring-Rack
Authors: Li Qiang , Pan Cun Yun , Xu Hai Jun
Published: August 2011

The contact characteristics of spherical gear and ring-rack are researched in this paper. First, the tooth profile surface equation of spherical gear is established on the basis of the transmission theory of spherical gears. After that, the profile surface equation of ring-rack is established. Then, kinematics of the transmission of spherical gear and ring-rack is researched, the appreciate coordinates are established, and the profile surfaces of spherical gear and ring-rack are described in the same coordinate. Then, the contact analysis is conducted between spherical gear and ring-rack, and the contact point and ellipse parameters are acquired, as well as the rules of their evolvements. The conclusions above are benefit to further research on the transmission of spherical gear and ring-rack.