bluuebunny/crossref_metadata_2025 huggingface dataset:
A Nonlinear Viscoelastic and Micromechanical Damage Constitutive Model for Solid Propellant
Authors: Gu Zhi Xu , Zheng Jian , Peng Wei , Tang Xi Nan , Yin Jun Hui
Published: August 2013

This paper studies the damage process induced by dewetting microcracks in composite solid propellant. A nonlinear viscoelastic constitutive model for composite soild propellant is presented. The damage variable D is derived from the microcrack system and is function of microcrack size density. The damage evolution equation is determinded by the extending of microcrack. Form the proposed model of microrack evolution process, an explicit form of damage evolution equation which is a function of stress field is given. The cracking event N and the new crack surface area damage ΔA formed by microcrack extension are defined. Material constants are determinded by acoustic emission tests. The rationality of our model has been confirmed by tension tests.
Effect of Helium on Stabilizing Vacancy Configuration in Delta-Plutonium
Authors: Ji Guo Xun , Li Ru Song , He Bin
Published: August 2013

The radioactive decay of Pu produces He atom, which may form cluster with vacancies or accumulate into He bubble, thus resulting in physical, chemical and mechanical changes. In this paper first principle evaluations of Pu lattice defected with mono-vacancy (or di-vacancy) and He atoms have been performed using the generalized gradient approximation (GGA) of the density functional theory and Perdew-Burke-Ernzerhof (PBE) exchange-correlation functional. The simulation results indicate that the density of states (DOSs) of Pu lattices seem stable when He/V (V represents vacancy) ratio is between 2:1-3:1, the partial DOSs of s, d and f states shift in the orientation of positive X axis, while f state peaks disappear around the Fermi level. Total energy per Pu atom in Pu lattice with mono-vacancy (or di-vacancy) and He atoms relative to total energy per Pu atom in perfect fcc Pu lattice nearly remains constant (about 8.18a.u.).
The Feasibility Study on Stability of the Propellant GLQ by Testing the Content of the Centralite in with Gas Chromatography Test
Authors: Lu Gui E , Chen Chen , Jia Hao Nan
Published: August 2013

The content of stabilizer in gas chromatography to detect the stabilizer content in different aging time of the propellant GLQ, and the analysis of testing and statistical data of the measured experimental data. The results show that, the content of centralite in propellant GLQ with aging time decreased, with changing of propellant GLQ stability with time. Therefore, using the gas chromatography to test the content of the centralite , and judging the stability of propellant GLQ is feasible.
Jet Blast Resistance Experiment of Engineered Material Arresting System
Authors: Xiao Xian Bo , Kong Xiang Jun , Shi Ya Jie , Yao Si Yuan
Published: August 2013

Engineered materials could arrest aircrafts rushing out of runway, but its fragile and can be easily damaged by jet blast exhausted by taking off aircraft nearby. Engineered material unit coating and encapsulation were described in this paper, and a jet blast resistance experiment is designed to quantitatively measure the units resistant capability. In this experiment, a test bed built by units will receive a taking-off Boeing 737-300 aircrafts jet blast for over 60 seconds. The test order decreased distance from aircraft tail to the test bed. And the predicted air velocity and temperature was calculated through aircrafts characteristics contour. All the design made the experiment high reliable and economical. Experimental result indicated that the nearest distance from the test bed to aircraft tail could be 15 meters, and this experiment result has already been used for design of the arresting system in a Chinese civil airport.
QSPR Study on Gross Heat of Combustion of Nitro Aromatic Compounds Based on Genetic Algorithm
Authors: Wang Rui , Cao Hong Yin , Kang Quan Sheng , Li Zhen Ming
Published: August 2013

A novel QSPR model was proposed as to predict the gross heat of combustion of 32 nitro aromatic compounds. Genetic algorithm (GA) was applied to select the optimal subset of the molecular structures descriptors most related to gross heat of combustion. The multiple linear regression (MLR) was taken to build a prediction model of gross heat of combustion for the 32 compounds. The correlation coefficients (R2) together with correlation coefficient of the leave-one-out cross validation (Q2CV) of the model is 0.997 and 0.995, respectively. The new model is highly statistically significant, and the robustness as well as internal prediction capability of which is satisfactory. This study can provide a new way for predicting the gross heat of combustion of nitro aromatic compounds for engineering.
Two Temperature Model Numerical Simulation and Analysis of Thermal Transport Process in Copper Film
Authors: Zeng Fan Da , Han Ya Ping , Wang Jin Xin , Wang Shao Ze
Published: August 2013

Thermal transport process in copper film was numerically simulated with Two-Temperature Model, in which finite difference method was used, and the result shown the temperature change process in electron-lattice system. Some parameters were changed to carry on further simulation. The affect of film thickness on the electronic relaxation time was analyzed. The affect of pump laser beam power on the electron temperature rise was discussed. The influence of electron-lattice coupling factor G on non-equilibrium thermal process was shown in simulations.
Research on the Relationship between Changes of Active Groups and Gaseous Products in Different Temperatures
Authors: Wang Fu Sheng , Meng Ya Ning , Hou Xin Ran
Published: August 2013

This paper reveals the relationship between the changes of active functional groups in coal and gaseous products. Intelligent coal heating and oxidation trial furnace and GC-4085 series gas chromatograph are used for heating and gas analyzing, then use Fourier-transform infrared spectrophotometer instrument (FTIR) tests the reactive functional groups of coal under different temperatures. Analyzing result shows that: alkane side chains of aliphatic react in the whole process of heating and oxidation. -CH2-, -CH2-CH2- and other bridged linkages crack into free radical groups when they are heated. CO, CO2 and alkane gases are formed in the reaction. At about 110°C, ethane gas appears; stretching vibration of aromatics, carbonyl acid in the plane and unsaturated hydrocarbon key in aromatic hydrocarbon are relatively stable, which start to react after 140°C with very small amounts of ethylene and propylene gases produced. CO, CO2 and alkane gases, which are produced by the reaction that peripheral side chains of coal adsorb surface complexes and the gases break away from the coal, are important parts for CO, CO2 and alkane, etc. to generate in low temperature.
The Effect of Steam Explosion Treatment on the Separation of Lotus Fiber
Authors: Yuan Ben Zhen , Han Guang Ting , Pan Ying , Zhang Yuan Ming
Published: August 2013

Lotus fiber is served as a novel kind of slender, soft and fragrant natural cellulose fiber which own perfect moisture absorption, good ventilation and culture meaning. However, current extraction approaches of lotus fiber usually exhibit low efficiency and high cost which limit its development and utilization. In this paper, based on the biological structure of lotus petiole, the steam explosion method is carried on for lotus fiber extraction from the separated vascular bundles. The morphologies of the samples exploded in different conditions of prepreg conditions, explosion pressure and residence times were sequentially characterized by SEM. The results show that the resulting lotus fiber is separated efficient while, under 5% sodium hydroxide prepreg conditions, the pressure is 1.5 MPa and residence time at 160 s. Therefore, this kind of steam explosion treatment can be proposed as the reasonable method for lotus fiber extraction. The present study can provide preliminary basis for the high efficiency production of lotus fiber through physical and mechanical method.
Synthesis and Characterization of Large Area Carbon Nanotubes Array
Authors: Wang Zhi , Yu Chun Hong
Published: August 2013

Large area carbon nanotubes array were synthesized on the quartz glass by a simple chemical vapor deposition. Scanning electron microscopy and transmission electron microscopy were used to evaluate the morphology and structure. The results show that the well-aligned arrays are synthesized and their length can reach millimeter range, these CNTs have varying outer diameters from 20 to 70 nm and display hollow tubular structures.
The Thermo-Mechanical Coupling Analysis of SiCp/A356 Composites Brake Disc of a Passenger Car
Authors: Cui Shi Hai , Yuan Jian , Li Hai Yan
Published: August 2013

The thermo-mechanical coupling finite element models of disc brakes made of aluminum metal matrix composites and cast iron for a passenger car under different emergency braking conditions were deveoped. And the braking process for brake disc was simulated by using finite element method. By analyzing distributions of the temperature field and stress field of the two brake discs with different thickness under emergency braking conditions, the weight reduction of the brake discs by using aluminum metal matrix composites substrate for cast irons was discussed and the simulation resusts showed that brake discs made of aluminum metal matrix composties can be used for passenger cars.
Synthesis and Characterization of Superparamagnetic Fe3O4 Nanoparticles
Authors: Sun De Hui , Wu Jiao , Zhang Ji Lin
Published: August 2013

We synthesized Fe3O4 nanoparticles using a solvent thermal method and characterized the morphologies, structures, surface properties, thermal stability and magnetism of the products by Field emission scanning electron microscopy (FE-SEM), Powder X-ray diffraction (XRD), Fourier transform infrared (FTIR), thermal gravimetric analysis (TGA) and vibrating sample magnetometer (VSM). The experimental results showed that the Fe3O4 nanoparticles have a tunable average size range from 55 nm to 85 nm. Their diameters decreased with increase of precursor FeCl24H2O concentration or increase of the reaction time under other reaction conditions held constant. The XRD pattern confirmed that the Fe3O4 nanoparticles belong to cubic structure. Magnetic investigation reveals that the Fe3O4 nanoparticles have higher saturation magnetization and negligible coercivity at room temperature.
Study on Mixing Time in Bottom-Blowing Ladle with Immersed Tube
Authors: Qi Qing Hua , Shen Ming Gang , Zhang De Hui , Wu Tao
Published: August 2013

As large flow rate of argon blowing in the process of bottom argon blowing ladle will cause severe fluctuations and sprays of molten steel, making the slags surface boiled and steel secondly oxidized, melting the refractory materials in the ladle, the flow rate of bottom argon blowing is limited, which will affect the efficiency of stirring. A 1:7 ratio ladle water model is established in the lab, and we will discuss how the diameter (d) of immersed tube, inserting depth (h) and the rate of bottom argon blowing affect the mixing time. The results show that the fluctuations on the steel surface can be diminished by the variations of diameters of immersed tube and inserting depth, the mixing time can be shorted by the increased flow rate of bottom argon blowing.
Properties Characteristics of Silicone Inhibitors
Authors: Chen Zhu , Li Dong , Shi Ai Juan , Li Yang , Wu Shu Xin
Published: August 2013

The short carbon fibers/ room temperature vulcanizing silicone rubber composites were prepared by mechanical mixing method and vulcanization at room temperature for 7 days as internal insulator. The effects of the content of fiber on the mechanical , ablative and adhesive performances for the composites were investigated. The results show that with increasing content of carbon fiber filled, the tensile strength increases, the break elongation decreases, and the ablation rate (Rt) of the composites decreases rapidly at first, then increases. When carbon fiber content is 10phr, the ablation rate (Rt) is 0.076mm/s. no significant differences in adhesive values were obtained yet.
Control of Element and Inclusion for X80 Pipeline Steel
Authors: Peng Qi Chun , Qiu Lei , Zou Jian , Tong Zhi Bo
Published: August 2013

According to the present situation of production X80 pipeline steel, the performance requirements of X80 pipeline steel, and the effect and control technology of various elements in steel, and the size and shape control technology of inclusions are reviewed. Weakness of X80 pipeline steel and the future developing direction of pipeline steel of our country.
Thermal Analysis of Solidification Process and Mechanical Properties in Heavy Section Ductile Iron Casting
Authors: Chen Wei Ping , Zhou Li Wei , Li Wen Hui , Liu Zhe
Published: August 2013

A heavy section ductile casting (HSDIC) with dimensions of Φ590 mm×800 mm was prepared. Cooling curves at the center, at 85 mm from the center, at 170 mm from the center and at 255 mm from the center of the casting were recorded and analyzed. The results show that the precipitation of initial graphite, nucleation of eutectic cell and mass eutectic reaction at 255 mm from the center were all earlier than the other three locations. Moreover, it takes the longest time of 53 minutes of recalescence at 170 mm from the center with the highest temperature rise of 7 °C, though the cooling rate at this location is not the lowest in the casting, the mechanical properties are the worst. In addition, the largest amount of chunky graphite appears at 170 mm from the center.
Effect of Addition of Al2O3-SiO2 Gel Powder on Strength of Al2O3-MgO Unfired Bricks
Authors: Wei Jun Cong , Liu Shu Xian , Niu Sen Sen , Ma Wei Ping , Tu Jun Bo
Published: August 2013

Al2O3-MgO unfired brick were prepared by using brown corundum, white corundum, fused magnesia and α-A12O3 as main starting materials, Al2O3-SiO2 gel powder as a binder. The effects of Al2O3-SiO2 gel powder on the strength of Al2O3-MgO unfired bricks were investigated. The phase composition was characterized by X-ray diffraction (XRD). The results showed that with an increase of Al2O3-SiO2 gel powder content, room temperature strength first increased and then decreased, and reached an optimum value at 5.5% addition. The hot modulus of rupture continuously increased. This mainly was related to the reactivity of Al2O3-SiO2 gel powder and the formation of mullite at high temperature.
Grain Refinement of Y in As-Cast Mg-Y Alloys
Authors: Zhang Qing , Li Quan An , Chen Jun , Zhang Xing Yuan
Published: August 2013

The grain refinement of 2-8 wt.% Y addition in as-cast Mg-Y binary alloys has been investigated. The results show that the microstructure of as-cast Mg-Y alloys consists of α-Mg matrix and Mg24Y5 phase. Mg24Y5 can become the effective nucleation core of α-Mg, and refine the grain size of the alloys. The ultimate tensile strength of as-cast Mg-5Y alloy is 180MPa at room temperature. Mg-5Y alloy can be a basis for developing light structural materials.
Study of the Phases of Mg-Zn-La Magnesium Alloys at 150°C
Authors: Huang Ming Li , Dong Li Na , Wang Ying Ling , Quan Li Wei
Published: August 2013

Alloys with different compositions in Mg-rich corner of Mg-Zn-La system at 150°C were prepared, and the phase equilibrium in Mg-Zn-La alloys were determined by scanning electron microscopy (SEM), electron probe microanalysis based on energy dispersive X-ray spectroscopy (EPMA-EDS) and X-ray diffraction (XRD). The stability, compositions and lattice structures of the intermetallic compounds of Mg-Zn-La alloys were identified. The results show that, there exists a ternary compound (T-phase) with constant La (about 8at%) and the changed ratio of Mg/Zn in the Mg-rich corner of Mg-Zn-La system. Though the ratio of (Mg, Zn)/La of T-phase is close to that of Mg/La of Mg12La, the T-phase was not the binary solid solution of Mg12La because of the difference of the lattice structure. It also reveals that T-phase is a stable phase, and it is in two-phase equilibrium of T-phase+Mg at 150°C.
Study on Oxidation Behavior of Beryllium Bronze
Authors: Zhang Yu Long , Zhang Wei Fang , Zhang Aiai , Zhao Shi Jun
Published: August 2013

The oxidation behavior of beryllium bronze is studied through phase and component analysis, SEM and other methods in the paper. Make a study on oxidation mass gain law of beryllium bronze between 210°C and 300 °C. Results show that the mass of beryllium bonze gains obviously at the initial time, then gains slowly gradually, which follows approximately parabolic rate law in whole. The oxidation of beryllium bronze is a progress of O spreads to interior of alloy while Be and Cu spread outside. The oxidation products are BeO and CuO, BeO is beneath CuO.
Microstructures of AZ61 Magnesium Alloy Solidified via Ultrasonic Vibration Treatment
Authors: Yao Jun Ping , Sun Zhong , Long Wen Yuan , Zhang Lei
Published: August 2013

The effects of ultrasonic vibration (USV) on the solidified microstructure of AZ61 magnesium alloy were investigated. The experimental results show that the remarkable microstructural refinement is achieved when the USV was applied to the solidification of the AZ61 alloy. The average grain size is decreased from 263 μm without ultrasonic treatment to 98 μm with USV treatment. The microstructure evolution reveals that the primary α-Mg generates and grows in globular shape with USV, contrast with the dendritic shape without USV. The USV causes melt convection during solidification, which makes the temperature of the whole melt homogenized, and produces an undercooling zone in front of the liquid/solid interface, which makes the nucleation rate increased and big dendrites prohibited. In addition, the β-phase in the entire cross-section of the billet is significantly refined and also changed from continuous to discontinuous morphology. Spherical β-phase is formed during the solidification of billet treated with USV.
Wear Behavior of Cu-Based Composite under Different Electrical Currents
Authors: Zheng Run Guo , Zhang Xin Xiu
Published: August 2013

Cu-La2O3 composite was fabricated by internal oxidation method using powder metallurgy. Its sliding behavior was studied under various electrical currents and applied loads. The worn surfaces of Cu-La2O3 composite were characterized using scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) to probe the wear mechanisms. The results indicated that applied load has a significant effect on the wear rate of the Cu-La2O3 composite pins. The wear rate displayed the minimum value at the load of 50N during electrical sliding processes.
Effect of Fe on the Performance of Rare Earth Aluminum Conductor
Authors: Ma Teng Di , Su Yong , Wang Qin , Li Jin Lei
Published: August 2013

The effect of Fe on the performance of rare earth aluminum conductor was investigated in this paper. The tensile strength, elongation and conductivity of the alloys were tested. The study results showed that Fe can significantly increase the tensile strength and elongation of the aluminum rod. However, with the increasing content of Fe, the conductivity of the aluminum rod reduced more obviously. In comprehensively considering the tensile strength, elongation and conductivity, the alloy gained better mechanical properties and conductivity when ω (Fe) was 0.3%.
Research of Resistance to High Temperature and Creep Resistant Magnesium Alloy
Authors: Zhang Xu Jin , Geng Gui Hong
Published: August 2013

The strengthening mechanism, properties and applications of magnesium alloy with resistance to high temperature and creep resistant were introduced. The effects of some kinds of elements in magnesium alloy and the preparation methods were also elaborated. At last, the development trend of magnesium alloy was overviewed.
Judgment Method of Accelerated Testing Effects on Compound Friction Material
Authors: Xu Shi Meng , Ma Run Bo , Du Jian Hua , Liu Jun Hong , Jin Qi
Published: August 2013

For an copper-based composite friction material the accelerated testing effects was judged under three kinds of testing stress in this paper, that was, through the block design method and analysis, the forthright and functional judging method was given in certain extent for the accelerated testing designed by this paper. Meanwhile, the both methods about basic statistical analysis and basic accelerated life testing was used for discussing the statistical distribution laws on the experiment data which that the copper-based composite friction material were under three kinds of testing stress.
Miscibility Study of Chitosan and Methylcellulose Blends
Authors: Liu Peng Tao , Wei Xiang Mei , Liu Zhong
Published: August 2013

The miscibility of chitosan / methylcellulose (CH/MC) blends was studied by FT IR, wide-angle X-ray diffraction (WAXD), thermogravimetric analysis (TGA), and scanning electronic microscopy (SEM). The regular changes of FT IR and WAXD spectra of CH/MC blend powder indicated the miscibility of the blends. TGA curves and SEM images of cross-sections of the blends films showed partly miscibility.
Sintering Properties of Fused Silica/Nano-Zirconia Composite Ceramic
Authors: He Yong Wu , Bu Jing Long , Wang Rui Sheng , Zhao Dong Mei , Chen Jun Xing , Yu Li Xue , Wang Zhi Fa
Published: August 2013

Zirconyl chloride was used as zirconium source and fused silica particles were used as main raw material. First of all, the composite powders were prepared by wet chemical synthesis using ammonia as the precipitator and polyethylene glycol as the dispersant. Then, fused silica nanozirconia composite ceramic containing nanometer particle zirconia with different contents (5%, 15%, 25% and 35%) were fabricated in reduction atmosphere at 1300°C, 1350°C and 1400°C for 1 h. The bulk density and bending strength were measured, microstructure was observed by SEM. The result indicated bulk density and bending strength of composite ceramic increase and microstructure becomes denser with content of zirconia increasing. Bulk density of composite ceramic increases and bending strength which reaches maximum at 1350°C firstly increases then decreases with the increase of sintering temperature. Both high sintering temperature and nanozirconia possessing high energy interface can improve the composite ceramic sintering.
Plastics: The Discovery in the World and Development in China
Authors: Jiang Ya Xi , Jiang Meng
Published: August 2013

Alexander Parkes found the earliest plastic in 1850. American scientist John Wesley Hyatt achieved the first patent of plastic (1970) and inaugurated the first plastics industry (1873) with his brother in the world. From then on, plastics industry all over the world have experienced about 150 years development. Based on the learning from overseas industries, China gradually constructed and cultivated himself plastics industry system that is full of Chinese characteristics. The amount of plastics production, plastics products and plastics machine production as well as plastics consumption in China increased quickly. The value of plastics import and export trade rose year by year. Nowadays, China reaches an advanced level in the world no matter plastics machine production, plastic goods production, plastics consumption, or outlet of plastics machines and products. Plastic industry has be one of the important light manufacturing pillar industries in society and economics development of China.
Compatibilizing Modification of Polyethersulfone/Polycarbonate Blend
Authors: Ma Cheng You , Ma Yan Mei , He Zhi , Yan Chen , Jiang Dong
Published: August 2013

Double block copolymers of polyethersulfone (PES)/polycarbonate (PC) were used as a compatibilizer for a blend of PES/PC. The morphology, thermal properties, mechanical properties, etc. of the resulting ternary blend systems were investigated. The addition of the compatibizer improved the compatibility between PES and PC. It was found that the interfacial adhesion was enhanced; the size of the dispersed phase was reduced. This resulted in an improvement of elongation at break and tenacity of PES/PC blends, while the tensile modulus slightly increased, and tensile strength was almost constant.
Preparation and Characterization of Blue-Emitting (SrCaBa)3(PO4)2•SrCl2:Eu2+ Phosphors
Authors: Cheng Dan , Yang Zhao Hai
Published: August 2013

For the demand of high color rendering W-LED, we chose (SrCaBa)3(PO4)2SrCl2:Eu2+ blue-emitting phosphor powder as the object of our study, and use high-temperature solid-state reaction method to prepare the phosphor powders in a weak reducing atmosphere. A detailed investigation on the reaction parameters, including kinds and relative ratio of raw materials, sintering temperature and Eu2+ activator concentration was conducted in terms of luminescent properties of phosphors powder. Research findings show that optimal reaction parameters are: sintering temperature is 1200°C, Eu2+ doping level is 0.15mol. By these parameters, the (SrCaBa)3(PO4)2SrCl2:Eu2+ phosphor powder show bright blue emission around 450nm and can be efficiently excited by violet and ultraviolet light (200nm-440nm). Further we employed the energy transfer between Tb3+ and Eu2+ and prepared a series of phosphors using (SrCaBa)3(PO4)2SrCl2 as host material. Research findings show that emission color can be adjusted from blue to blue green by the ratio of Tb3+ to Eu2+, with line-like Tb3+ green emission overlapped on band-like Eu2+ blue emission.
Influence of Substrate on Soft Magnetic Properties of Fe-Co-Si/Native Oxide Multilayer Films
Authors: Zuo Hua Ping , Ge Shi Hui , Zhang Feng , Wang Guo Wei , Xu Min , Wu Chun Hua , Li Lin
Published: August 2013

The [Fe-Co-Si (d)/native oxid50 multilayer films were deposited on Kapton substrate and glass substrate by DC magnetron sputtering. The effect of substrate on magnetic and electric properties of the multilayer films was investigated. Compared to the films on glass substrates, higher coercivity, larger uniaxial-anisotropy field were achieved for the flexible films. The values of the resistivities for the flexible films are of the order of 10 mΩcm, which is two orders higher than the value of 0.1 mΩcm for the multilayer films on glass substrates. Furthermore, higher fr was found in the flexible films. It is believed that the [Fe-Co-Si (d)/native oxide]50 multilayer films on flexible substrates can find its wide applications at high frequency for various purposes.
Synthesis and Characterization of CdSe Nanocrystal Quantum Dots by Solution-Liquid-Solid Method
Authors: Chen Hai Yun , Shan Yu Kai , Qin Yu Yue , Chuan Yong Ming , Yuan Ming Long
Published: August 2013

The present work describes a solution-liquid-solid (SLS) synthesis route for the preparation of CdSe nanocrystal quantum dots using the low-melting-point Bi nanoparticles as catalysts. UV-vis absorption spectra were used to determine the growth of CdSe cluster. The shape and size distribution of the CdSe QDs were determined by analysis of Transmission electron microcopy (TEM) images. A peak wavelength of 399nm in the absorption spectra on day 5 indicated that the CdSe cluster formed. TEM micrographs showed that CdSe QDs had a relatively narrow distribution of QD size, and the diameter of CdSe QDs was about 4 nm. Our preliminary results illustrated that smaller size of CdSe QDs could be prepared by SLS method and it was small enough for bioimaging applications.
Nonlinear Response Analysis of Three-Span Rotor-Bearing System with Three Cracks in Shafts
Authors: Zhang Song He , Luo Yue Gang , Wu Bin , Hu Hong Ying
Published: August 2013

The model of three-span rotor-bearing system with three cracks in shaft supporting on the six sliding bearings was set up. The influences of crack faults to the responses of the rotor system were studied on numerical simulation. Along with the increase of the crack depth in first span, the main influence to the dynamic characteristics of the system is in the first span. Along with the increase of the crack depth in second span, the main influences to the response of first and third spans are in the region of critical rotate speed, and it to the second span is in the regions of critical and supercritical rotate speed. Along with the increase of the crack depth in third span, the main influences to the response of the three spans are in the region of critical rotate speed.
Study on the Characteristics of Air Spring
Authors: Yang Qi Yao , Ma Yu Ping , Wu Yue Bo , Zhang Jian Zhong , Xu Xing
Published: August 2013

Due to of nonlinear performance and variable rigidity characteristic vehicle equipped with air suspension has more progress in the driving smoothness and handling stability. In the analysis based on the characteristics of air spring and the principle of gas flow, the paper aims at obtaining the relation curve between stiffness of air spring and on/off time, therefore, the calculation of a example has been done, which provides the valuable basis for the bench tests of air spring and vehicle control test.
Optimization Design for Structure of a Shroud Base on Fluent
Authors: Yan Chen , Li Ying , Ma Bei Yue , Zhai Ying Ying
Published: August 2013

This paper reports a CFD modeling study on the optimization design for the shroud structure of a three-phase electroslag furnace using double electrode series technique by a commercial code FLUENT. The Realizablekεturbulence model, Do radiation model and Mixture model are amply used to compute the flow of gases in the furnace under different entrance layouts of the shroud, and the influence of entrance layout on the air volume fraction in the furnace is obtained. Finally, a suited suggestion on the entrance layout of shroud is presented that ring topologies should be adopted.
Development & Application of Analysis Tool for Offshore Structure Skidshoe Design
Authors: Zhang Hui Chi , Wu Nan
Published: August 2013

As an important loading transmitting component in construction and loadout process of offshore structure, skidshoe bears great bending, shearing, pressure and kind of other loadings during its serving period. Based on mechanics theoretic and practical project model, in compliance with related international codes and standards, an analysis tool for skidshoe design is developed in this paper, which utilizes Excel computation sheets powerful data-handling capacity and Visual Basics friendly consistent interfaces. This tool considers typical load conditions for both construction and loadout process in skidshoe analysis.
Based on the Digital Design of the Pneumatic Pick Force Analysis and Research of Key Parts
Authors: Shen Chen , Gui Hua Liang , Wu Ming Ming
Published: August 2013

Pick is a hand-held machine of the air power machinery, using compressed air as power, hit a rundown coal and ore body or other objects. In the working process of the pneumatic pick, pick cylinder under different loading easily lead to early obsolescence. In order to improve the impact resistance performance to pick picks, prolong the service life of pneumatic pick, based on the digital design method for pneumatic pick pick cylinder is modeled, and based on the simulated stress analysis, for the process improvement, improve its mechanical performance, reduce the waste of raw materials.
Finite Element Analysis of Multi-Function Chassis Underframe
Authors: Lv Xiao Rong , Ding Wei Min , Yang Huai Feng
Published: August 2013

The failure of the underframe is one of the most important factors affecting the service life of the multi-function chassis. This paper established a virtual model of multi-function chassis by UGNX 3D software; The use of the finite element analyzed model, find the weak link of underframe, and effectively reduce the underframe weight, determine the optimal scheme. Based on the underframe structure design to create the underframe prototype, and passed the test to prove the prototype running smoothly, safe and reliable.
A Study on Product Materials Mental Imagery Perception of User Experience Design
Authors: Xia Hui Chao , Zhang San Yuan
Published: August 2013

Why are the product design of the Apple Inc. are so successful in the dog-eat-dog market? One of the most important reasons is that the mental imageries of product user experience design of Apple Inc. are close to the user's expectant material mental imageries.In this study, we want to gain the main mental imageries of information product materials user experience design of the target users (18-28 years old university students or the recent graduates in the east of China) in the near future of the next 1-2 years. We used Culture Scan, Contextual Inquiry, Semantic Differential Method, and the Coordinate of Mental Imagery to study. We discovered that the main mental imageries of information product materials user experience design of the target users in the near future of the next 1-2 years are high-technological and fashionable. We built a bridge from the the material mental imagery of the user to the material mental imagery of the designer. The actual demand of the consumers could be more easily understood by the company.
Research on Friction and Wear of Gear Transmission with Meshed Medium Belt
Authors: Fan Zhi Min , Yang Hui Xia
Published: August 2013

As a new type of gear transmission, the gear transmission with meshed medium belt has advantages of reducing vibration noise and friction damage on the gear surface. During the process of the gear transmission with meshed medium belt, the friction and wear is mainly occurred on the medium belt, so the service life of the medium belt has a direct effect on the performance and efficiency of the transmission system. The friction and wear mechanism of the medium belt is researched and effective ways to prolong the service life of the medium belt are given in this paper.
Vibration Analysis of a Screw Pump Unit
Authors: Zhang Yue , Xiao You Hong , Weng Jun , Li Wan You
Published: August 2013

In this paper, the vibration of a three screw pump was studied. Firstly the vibration response of the pump was tested. Then the FE model of the pump was constructed and the modals of it were calculated. The exactness of the result was confirmed by the testing modals and the reasonable of the FE model was verified at the same time. Finally, the force acted on rotors due to pressure was calculated by the mathematical method of surface integral. The force was loaded on the FE model and the force response was predicted, which represented the basic vibration of the screw pump. Based on the work above, the vibration spectrum of the screw pump was analyzed.
Research on Coordinate System Transformation in Flexible Rope FEA
Authors: Zhao Yun Peng , Li Nan
Published: August 2013

This paper focuses on the transform relationships between each element and between elements with inertial system under different attitude coordinate system in the finite element multi-body system mechanical analysis of the flexible rope process. It mainly research the attitude coordinate transformation matrix between the of flexible rope Micro-element and inertial system under the four coordinate system which are the direction cosine coordinates, finite rotation four element coordinates, Euler angle coordinate and Cardan angle coordinates, and the relationship between the connecting base on the element type and inertial reference based.
Study on the Safety Margin of Pressure Vessel Pit Defect Based on the Defect Failure Simulation Path
Authors: Li Gao Zhan , Long Wei , Tian Da Qing
Published: August 2013

In order to obtain the level of security of the pressure vessel with pit defects, a safety evaluation simulation system bases on the failure paths of pit defects was used to find the level of dynamic security. The parallel method or radial method can not be used to get the real level of dynamic security of pit defects, but the distance along the failure path to the safety critical line, and a new way was provided in detail.
Molten Pool Image Processing and Feature Extraction Based on Multiple Visions
Authors: Wu Da Wei , Xiong Zhen Yu , Gu Wang Ping , Shan Jun
Published: August 2013

A molten pool image gathering system is designed based on multiple visions. By using a composite filter, it can effectively overcome the interference of the welding arc and obtain a clear molten pool image. A series of image processing algorithms has been proposed based on the features of the molten pool image. A median filtering has been used to remove the noise of the molten pool image. A canny multi-threshold method has been used to extract the edge characteristics of the molten pool. Then the edge feature of the molten pool can be gotten after false edge removing and iterative fitting.
Machine Vision Inspection of In Vitro Diagnostic Kits
Authors: Mei Jiang Ping , Liu Yi
Published: August 2013

A machine vision-based inspection system was proposed to inspect the defects of in-vitro diagnostic kits in the production line. The proposed system consisted of two sub-systems, which inspect the strip surface defects and strip assembly defects respectively. The procedure to inspect five types of major defects was determined by the application of image processing and analysis techniques such as image enhancement, edge detection, threshold segmentation, and morphology. The proposed system was implemented using 300 defect samples. Experimental results show the proposed system is effective and efficient.
Design of Optical Electronic Watch System Based on Multi-Sensor
Authors: Wu Chuan , Lu Jian Feng , He Bai Gen
Published: August 2013

Optical electronic monitoring system is widely used in battlefield assessment, forest fire preventing, road monitoring, etc. This paper proposes an optical electronic monitoring system based on multiple-sensor. Multi-sensors use common optical route in this the system. It means to get the same scene in the same time. In order to extend the transmission distance, reducing the complexity of the wiring, the system design a transform module. Through the transform module, the system transforms CamerLink standard signal to network package and uses network transmission image.
High Speed Train Bogie Fault Signal Analysis Based on Wavelet Entropy Feature
Authors: Qin Na , Jin Wei Dong , Huang Jin , Jiang Peng , Li Zhi Min
Published: August 2013

Mechanical behavior of high speed trains bogie seriously impact the reliability of the train system. Performance monitoring and fault diagnosis for the critical component on bogie are very important. Simulation data of high speed train bogie fault signal is selected in data experiment. Based on multiresolution analysis, wavelet entropy features are extracted to reflect the uncertainty level of the vibration signal on scales. In the high dimension space composed by several wavelet entropy features, the dates from four fault patterns are classified and the result is satisfactory. Result show that wavelet entropy feature is effective for fault signal analysis of high speed train bogie.
High Resonance Component of Resonance-Based Sparse Decomposition Application in Extraction of Rolling Bearing Fault Information
Authors: Huang Wen Tao , Liu Yin Feng , Niu Pei Lu , Wang Wei Jie
Published: August 2013

In the early fault diagnosis of rolling bearing, the vibration signal is mixed with a lot of noise, resulting in the difficulties in analysis of early weak fault signal. This article introduces resonance-based signal sparse decomposition (RSSD) into rolling bearing fault diagnosis, and studies the fault information contained in high resonance component and low resonance component. This article compares the effect of the two resonance components to extract rolling bearing fault information in four aspects: the amount of fault information, frequency resolution of subbands, sensitivity to noise and immunity to autocorrelation processing. We find that the high resonance component has greater advantage in extraction of rolling bearing fault information, and it is able to indicate rolling bearing failure accurately.
Damage Identification for Truss Structures Using Eigenvectors
Authors: Jin Wei Min , Yang Qiu Wei , Shen Xue , Lu Fang Jun
Published: August 2013

This paper presents a two-stage structural damage identification method using the incomplete measured modal parameters. The first stage locates damages preliminary by using the generalized energy change of each structural element, which is defined as the inner product of the mode shape with the elemental stiffness connectivity vector. After the suspected damaged elements are determined in the first stage, the first order sensitivity of the structural eigenvector is used to identify damages more precise in the second stage. The significant advantage of the proposed method is that it is economical in computation and is simple to implement. A truss structure is analyzed as a numerical example to verify the present method. Results show that the proposed method performs well even if the measurement errors inevitably make the damage assessment more difficult. It has been shown that the presented methodology may be a promising tool to be used by research groups working on experimental damage localization.
A New Design of Pain Monitoring System during General Anesthesia Operations Based on Pulse Wave Transfer Function
Authors: Liu Han Cheng , Hu Yi , Ye Shu Ming , Xu Zhi
Published: August 2013

Pain monitoring is essential during general anesthesia operations. Previous researchers have found relationship between pulse wave and painful stimulation and introduced parameters based on photoplethysmography (PPG). According to arterial windkessel model, pulse wave transfer function (PWTF) would represent the transmission of stimulation but there was little research on this. A synchronous dual channel PPG acquiring system with ECG circuit and external blood pressure module is built to push on the research. System works well with testers aged from 10 to 65, both male and female.
Research on LED Lighting Control Method for Railway Vehicle Carriage
Authors: Zhang Bang Cheng , Yin Xiao Jing , Jiang Yan Qing , Hu Yan Juan
Published: August 2013

Because of the communication distance, the more nodes, the requirements of high real-time, LED lighting control system for railway vehicle carriage chooses Controller Area Network (CAN) as the communication mode to achieve centralized control in all carriages. Illuminance gathered from multi-sensors which were installed on the surface of the carriages was feed back to the Industrial Personal Computer (IPC). And then, through the incremental PID control algorithm, the IPC achieve the brightness of the lighting system intelligent control for vehicle consulting brightness intensity which according to the external environment. Experiment shows that this method is practical and effective.
Reactive Power Automatic Compensation Controller Based on PLC
Authors: Wu Ya Jun , Jia Zhu Zhi , Jin Xiao Chen
Published: August 2013

A high reliability, flexible reactive power automatic compensation controller based on PLC is designed, which the structure and principle of the system is explicitly specified. The controller adopts commercial PLC as the control core,TD400C as human-machine interface, and uses ABB RVT-6 power factor controller to control the switching of the capacitor. Blocking structure is used to design software, whose structure is clear and easy to debug and modify. Running result obtained from relevant application describing the novelty of reactive power compensators implemented with new technologies is also described.
An Umbrella-Shaped Antenna Designed for Receiving Satellite Data
Authors: Long Zhi Yong , Chen Liang , Shi Han Qing , Yi Xin
Published: August 2013

In this paper, we designed an umbrella-shaped antenna for receiving low rate satellite data. The umbrella is suit for receiving satellite data in motor and emergency weather safeguard, with small volume, portable and easy to setting and debugging.
The Vanadium Titanium Magnetite Tailings of Chengde Area Comprehensive Recycling Situation and Development Trend
Authors: Liu Shu Xian , Wei Jun Cong , Wei Shao Bo , Nie Yi Miao
Published: August 2013

Summarized the siutuation of the vanadium titanium magnetite tailings recycling in Chengde, TiO2 in ilmenite tailings grade almost more than 2%, caused by TiO2 resources waste, put forward by gravity separation, magnetic separation,and flotation combined process method for titanium iron ore tailings reelection, and put forward the technological process selection by reducing the grinding fineness, increasing number of handpick and scavenging, adopt combination process and increasing flotation process to increase the recovery rate of TiO2, reduce TiO2 grade in the tailings.
IDSA: Chord-Based Discovery Service Architecture for the Internet of Things
Authors: Xu De Gang , Qin Lei Hua , Zhou Jing Li
Published: August 2013

Nowadays, the item-level lookup is quickly becoming a key issue in many application scenarios of Internet of Things (IoT). However, as a critical role of IoT, current lookup services and discovery services rely on a centralized or a chain-style framework, thus have some drawbacks, which prevent them from being widely adopted, as well as the item-level lookup service is still missing. Therefore, based on Chord, we presented IDSAa distributed item-level discovery service architecture for IoT, gave its basic framework and some relevant mechanisms to make the lookup services more load-balanced, scalable, and efficient. Additionally, some tests and analysis were given to validate and evaluate our solution. The results show that our solution is available.
Research on Mobile Terminal Based Real-Time Retargeting Technique for Manga Images
Authors: Li Min , Gao Xing , Liao Ming Hong , Lin Jun Cong
Published: August 2013

With the rapid growth of mobile terminal diversity and versatility, manual generation and maintenance of different versions of a manga image are currently required in mobile phone animation industry to achieve best display effect on various terminal configurations. This paper does researches on the real-time retargeting technique for manga images. By generating the importance map and analyzing the redundancy of feature lines in the manga image, combined with a retargeting algorithm, the solution proposed in this paper can solve the real-time retargeting of manga images on mobile terminals. For most of manga images, this solution can automatically generate a good resizing image with its key object outstanding based on screen resolution and size of the target terminal in real time.
A Hybrid Hypergraph Partitioning Algorithm for Scientific Computing
Authors: Zeng Yao Yuan , Zhao Wen Tao , Wang Zheng Hua
Published: August 2013

Hypergraph partitioning is an increasingly important and widely studied research topic in parallel scientific computing. In this paper, we present a multiway hypergraph partitioning algorithm, mixed simulated annealing algorithm for global optimization and tabu search algorithm for local optimization. Experiments on the benchmark suite of several unstructured meshes show that, for 2-, 4-, 8-, 16-and 32-way partitioning, the quality of partition produced by our algorithm are on the average 6% and the maximum 17% better than those produced by partitioning software hMETIS in term of the cutsize metric.
Study on Prediction Model for Cutting Surface Roughness of Hardened GCr15 Bearing Steel
Authors: Yang Ting , Liu Hong Bin , Wu Hai Tao
Published: August 2013

CBN cutting tool is used to cut hardened GCr15 bearing steel. Based on the surface roughness under different cutting parameters, people built the prediction model of surface roughness by Linear Regression algorithm, and carried on the significance test of it, the results show that the surface roughness forecast model set up by linear regression algorithm has a certain reliability and its linear regression equation is significant; among the cutting parameters, cutting speed and feed rate make great impact to the surface roughness and back engagement of the cutting edge has little impact to the surface roughness of test specimen.