bluuebunny/crossref_metadata_2025 huggingface dataset:
Morphological and Electrical Property of Viscose Fiber Coated with Polypyrrole
Authors: Wang Wen Yu , Jin Xin , Zhang Yu Feng
Published: February 2011

Polypyrrole (Ppy)-coated viscose fibers have been prepared by vapor phase and liquid phase pyrrole deposition technique, respectively. Comparative morphological and electrical property analysis was carried out on the viscose fiber prepared with both vapor and liquid phase processes. The result showed the configuration of Ppy coatings and electrical property had a strong relation with the deposition technique. Ppy-coated viscose fiber prepared by vapor phase show a high uniform polypyrrole coatings, fine Ppy granular structure, lower electrical resistance, and good fastness performances to abrasion.
Preparation of N-Doped SiC Whisker by Combustion Synthesis
Authors: Su Xiao Lei , Xu Jie , Li Zhi Min , He Xin Hai , Wang Jun Bo , Fu Chong , Zhou Wan Cheng , Luo Fa
Published: February 2011

N-doped SiC whiskers with diameters of about 0.2 μm and length of 3-7 μm were synthesized via combustion reaction of Si/C system in Ar atmosphere, using NH4Cl as the dopant and polytetrafluoroethylene (PTFE) as the chemical activator. These whiskers are straight and curved morphologies. X-Ray powder diffraction pattern and energy-dispersive spectroscopy (EDS) confirm that the lattice constant of prepared whiskers is smaller than standard value of β-SiC due to the N doping arising.
Research on Some Novel Trigonal Schiff Base Compounds With Aromatic Core and Different Substituted Groups
Authors: Jiao Ti Feng , Zhou Juan , Zhou Jing Xin , Wang Qiong , Luo Xu Zhong
Published: February 2011

Some novel trigonal Schiff base compounds with aromatic core and different substituted groups have been designed and synthesized from the reaction of trigonal aromatic amine with different aldehydes. It has been found that depending on the molecular structures and substituted groups, the formed trigonal Schiff base compounds showed different properties, indicating distinct regulation of molecular design. UV and IR data confirmed commonly the formation of Schiff base as well as aromatic segment in molecular structures. Thermal analysis also clarified the structural influence of these compounds in different temperature ranges. The difference of thermal stability is mainly attributed to molecular structures, formation of Schiff base group and different substituted groups. The present results have showed that the special properties of Schiff base compounds could be turned by modifying molecular structures and substituted groups, which show potential application in fields of functional material and catalyst.
Electrolytic Preparation of Stannous Methanesulfonate Using Uniform Design Method
Authors: Sun Jie , Zhang Xing Wei , Meng Jin Hong
Published: February 2011

Electrolysis method was used to prepared stannous methanesulfonate by using tin plate as the anode and graphite as the cathode in the methylsulfonic acid solution. Based on the uniform design experimental program, the multivariate nonlinear regression equation, which described quantitatively the inherent law of experiment, was established. The optimal conditions of synthesis were determined by data mining technology. The conversion rate was 97% when in optical conditions. From the results, it was shown that the influence degree of each factor is as follows: current density > electrolyte concentration > stirring speed > reaction temperature.
Study on in-Situ Preparation and Growth Mechanism of TiCxN1-x Whiskers
Authors: Chong Xue Wen , Huang Chuan Zhen , Xu Liang , Zou Bin , Liu Han Lian , Zhu Hong Tao
Published: February 2011

TiCxN1-x whiskers were prepared using TiO2 and carbon mixed powder as the starting powder at the atmosphere of nitrogen by the carbothermal reduction process. NaCl and NiCl2 were added into the starting powder as the cosolvent and growth adds of impurities, respectively. An effect of the content of TiO2 and carbon in the starting powder on the TiCxN1-x whiskers was investigated. It is found from SEM and XRD observations that three types of TiCx N1-x whiskers are obtained when the different mol ratios of C and Ti are applied. The growth of whiskers is not only urged by the droplet on the top of whiskers, but also initiated by the helical dislocations. The growth of TiCxN1-x whiskers is controlled by the vapor-liquid-solid mechanism as well as vapor-solid mechanism.
Synthesis and Characterization of an Aminated D-Glucose and its Stability of Cu2+Complex
Authors: Liao Qiang Qiang , Li Yi Jiu , Xiang Bo
Published: February 2011

An aminated D-glucose [N,N'-di-b-D-glucopyranosyl ethylenediamine] was prepared and thoroughly characterized by FT-IR, ESI-MS, NMR spectra and elemental analysis. Compared with D-glucose, the FT-IR spectrum of the aminated glucose showed a moderate peak at 1629~1608 cm-1 which was attributed to dNH vibration, suggesting glucose reacted to ethylenediamine (en). The ESI-MS spectrum exhibited a strong peak at m/z 383.2, which was assigned to the species [C14H27O10N2]-. The 1H-NMR spectrum of the aminated D-glucose demonstrated the signal of the C1 proton and the amino proton at 4.82~4.79ppm, illustrating the amino of ethylenediamine was substituted for the hydroxy group of C1. As for UV spectra, the aminated glucose hadn’t absorbance in the ultraviolet region while its complex with Cu2+ had obvious absorption peak at about 236nm. The complex ratio of the aminated glucose to Cu2+ was close to 1:1 and the stability constant of its Cu2+ complex was 6.8*107 in 0.01mol×L-1 borax buffer solution.
Reduced Graphene Sheets as Catalysts for Oxygen Reduction Reaction in Alkaline Media
Authors: Wu Jia Jia , Wang Yi , Zhang Dun
Published: February 2011

Reduced graphene sheets (RGSs) were prepared via hydrazine reduction of exfoliated graphite oxide and their morphology was characterized by atomic force microscopy. The electrocatalytic reduction of oxygen (O2) with RGSs was studied by cyclic and rotating risk electrode voltammetry using RGSs-modified glassy carbon electrodes in alkaline media. The results show that this modification with RGSs makes the peak potential shift in the positive direction and increases the peak current. The kinetics study shows that the numbers of electrons transferred for the oxygen reduction reaction are ca. 3 at potentials of the first reduction wave, indicating the peroxide produced can transfer into OH–.
Micro-Tubular Solid Oxide Fuel Cell with Asymmetric Structure Anode and La0.6Sr0.4Co0.8Cu0.2O3−δ Perovskite Cathode
Authors: Zhou Jian Er , Zhang Xiao Zhen , Wang Yong Qing , Lin Bin , Hu Xue Bing , Meng Guang Yao , Liu Xing Qin
Published: February 2011

Micro-tubular solid oxide fuel cell (SOFC) has been fabricated with NiO-YSZ hollow fiber as anode support and La0.6Sr0.4Co0.8Cu0.2O3−δ-Sm0.2Ce0.8O1.9 (LSCCu-SDC) composite cathode. The NiO-YSZ hollow fiber anode was prepared by the immersion-induced phase inversion technique and shows a special asymmetrical structure with porous sponge-like structure in the middle and finger-like structure on the inner and outer side of the hollow fiber. A thin and dense electrolyte membrane (about 12μm) was deposited on the anode by a vacuum-assisted dip-coating process. The performance of the as-prepared hollow fiber SOFC (HF-SOFC) was tested at 600-800°C with humidified H2 as fuel and ambient air as the oxidant. The peak power densities of 531.1, 362.5 and 214.6mWcm-2 can be obtained at 800, 700 and 600°C, respectively. The good performance at intermediate temperature (IT) indicates promising applications as power sources for portable devices for the prepared YSZ-based micro-tubular SOFCs with LSCCu-SDC composite cathode.
Design for Experiment Device for Abrasive Flow Machining Based on Pro/E and ANSYA
Authors: Liu Wei Na , Xie Shi Min , Yang Li Feng , Zhao Lei
Published: February 2011

Abrasive flow machining (AFM) is an effective way to the irregular surface and internal structure of parts polished, debarred, filleted finish machining and so on. Presently abrasive flow machining is primarily applied for aviation, aero-plane in China, but it hasn’t been used widely. Because there are still many technical problems to be solved, such as: the studies on AFM equipment, preparation of abrasive and cutting mechanism. In order to further improvement of AFM technology, a lot of experimental research should be done. In this paper, by Pro/E design for the experimental device, and by ANSYS analysis of mechanical properties, and finally the test device can be verified to meet the test requirements, and achieve the test successfully.
Synthesis of N-Butyl Propionate Catalyzed by Multi-Walled Carbon Nanotubes Loaded Cerous Sulfate
Authors: Jiang Bo Quan , Liu Yu De , Zeng Jiang Nan , Wang Min Wei
Published: February 2011

Multi-walled carbon nanotubes ( MWCNTs) was used, as a catalyst carrier, to load cerous sulfate for catalyzing the synthesis of n-butyl propionate. The effects of nitric acid concentration, reaction time and reaction temperature on the purification of MWCNTs were investigated. The effects of molar ratio of butyl alcohol to propionic acid, the cerous sulfate load and the reaction time on the conversion of butyl acid were studied by single factor experiment method and orthogonal experiment method, respectively. The results show that the optimal conditions for purifying MWCNTs are: nitric acid concentration of 4 M, reaction time of 8 h and reaction temperature of 103°С and the optimal conditions for synthesizing n-butyl propionate are: molar ratio of butyl alcohol to propionic acid of 1.5:1, use level of loaded cerous sulfate of 0.15 g and reaction time of 70 min. The conversion of butyl acid for the MWCNTs loaded cerous sulfate reaches 96.7% which is higher than that for the unloaded cerous sulfate and the use level of cerous sulfate for the former is much less than that for the latter under same operation conditions.
Preparation and Characterization of Expanded Graphite with ZnO Composites
Authors: Wang Li Qin , Yang Xiang Ni , Zhao Xiu Li , Zhang Rui Jun , Yang Yu Lin
Published: February 2011

The composites of expanded ghaphite with ZnO (EG/ZnO) have been prepared in the method of impregnation, and their degradation performance for crude oil have been investigated by the means of UV-Vis and FT-IR. The morphology and crystal structure of the EG/ZnO composites have been characterized by the means of SEM and XRD. The results are shown as follows: the EG/ZnO composites keep the laminated and microporous network structure of EG. ZnO particles in the composites are hexagonal crystal system, and they widely distribute in the cavities and the network pores of EG. In the UV-Vis spectra, there is a blue shift about 13 nm, which is from 255 nm to 242 nm at the biggest absorption peak. That indicates the component of the crude oil has already changed. Meanwhile, the results of FT-IR spectra show that a degradation reaction occurs obviously in the crude oil after irradiated by ultraviolet ray, and the degradation products possibly include alkone, aldehyde, alcohol, and so on. Thus, it can be inferred that the prepared EG/ZnO composites would be a new kind of functional material integrated strong adsorption property and degradation property into itself.
Photocatalytic Degradation of Ammonia Nitrogen in Aquaculture Wastewater by Using Nano-TiO2
Authors: Zhu Peng Fei , Yu Xiao Cai , Du Qian , Song Kui Sheng , He Zhong Hua
Published: February 2011

The nano-TiO2 photocatalyst was prepared via sol-gel method, and the crystal structure and surface morphology were characterized by XRD and SEM. The photocatalytic degradation of ammonia-N in aquaculture wastewater was investigated by using nano-TiO2 under UV irradiation. In the experiment, the effect of nano-TiO2 dosage, ammonia-N initial concentration, pH value, H2O2 volume concentration, and reaction time, respectively, on the removal of ammonia-N was investigated. On the basis of the results of these experimental data, an orthogonal array experimental design was used to select more efficient degradation condition. The optimal experimental conditions for photocatalytic degradation of ammonia-N can be stated as follows: when the concentration of ammonia-N was 20 mg/L, nano-TiO2 catalyst dosage was 1.2 g/L, the pH value of solution was 5, H2O2 volume fraction was 4 %, respectively, if the reaction time may last 3 h, the removal rate of ammonia-N was expected to reach 92.10 %.
Design and Optimization by Design-Expert Software for Carbon Cycle Mico-Electrolysis Reactor Treatment of the Phenol Wastewater
Authors: Zhang Wan You , Miao Yu , Zhang Hai Feng
Published: February 2011

A tentative plan of phenol wastewater treatment by using the carbon cycling micro-electrolysis reactor (CCMER) was designed and its result was analyzed with Design-Expert 7.1 software. The experiment results showed that the relation model between CODcrremoval efficiency and the effective factors with different operating variables was established and normal probability plot of residual, response surface and contours for desirability function of CODcrremoval efficiency with different effective factors were given. A group of optimization parameters for CODcrremoval efficiency would be consulted by Design-Expert 7.1.
Formation of Ketoacids in Filtered River Water with Synthetic Goethite-catalyzed Ozonation
Authors: Lu Jin Feng , Zhang Yong , Liu Yan Fang , Yue Shang Chao , Ma Jun
Published: February 2011

This work comparatively investigated the formation of ketoacids of a filtered river water in synthetic goethite-catalyzed ozonation and ozonation alone. Results indicate that the catalytic ozonation produces less pyruvic acids and total ketoacids than ozonation alone. In addition, the yields of total ketoacids of the filtered water after catalytic ozonation increased as ozone dose increased and contact time extended. In comparison to ozonation alone, FeOOH/O3 further enhanced the degree of oxidation of the macromolecular intermediates or by-products such as pyruvic acid due to more •OH generation. However, Bio-filtration is still proposed to follow the catalytic ozonation to ensure the microbial stability in water distribution systems.
Fractal Analysis of the Ortho-Cortex and Para-Cortex of Wool Fiber
Authors: Fan Jie , Yu Weidong
Published: February 2011

Wool fiber shows a natural crimp morphology, which endows textiles made of wool fiber with good elasticity and warmth-retaining performance. The natural crimp of wool fiber is due to the difference of the hierarchic structure of ortho-cortex and para-cortex of wool fiber. The present study investigated the fractal structure of ortho-cortex and para-cortex in detail to provide a new interpretation for the reason why the wool fiber has a natural crimp morphology and good performance in textiles.
Preparation of A Spherical Cellulose Adsorbent as Amino Acid Sorbent
Authors: Lin Chun Xiang , Liu Ming Hua , Zhan Huai Yu
Published: February 2011

The spherical cellulose adsorbent was prepared by grafting acrylic acid onto the spherical cellulose beads prepared by NMMO method. The effecting factors, e.g., monomer concentration, initiator concentration, reaction temperature and reaction time were optimized by the orthogonal and signal-factor experiments and the structure of the adsorbent was characterized by FTIR and SEM. The graft mechanism was also discussed. Moreover, the spherical cellulose adsorbents were shown to behave as good sorbents for basic amino acids L-Arg, L-Lys and L-His.
Preparation, Characterization and Photocatalysis Properties of Ultrafine Perovskite-Type LaCoO3
Authors: Fu Xia , Chen Yang , Yu Gao Qi , Yu Chao , Wang Hou Zhi , Zhang Guang De
Published: February 2011

Using La2O3 and Co(NO3)2•6H2O as raw material, ultrafine perovskite-type oxides LaCoO3 was prepared by Supercritical Fluid Drying Technology and Sol-Gel method. The prepared materials’ crystal structure and morphology were characterized by TG-DTA、XRD、FT-IR and TEM. The photocatalytic activity of ultrafine LaCoO3 powders was evaluated by degradation of methyl orange (MO) solution under 15W UV light irradiation. The results show: At 250°C , the amorphous ultrafine La-Co particles with the size less than 10 nm can be obtained by Supercritical Fluid Drying Technology. At 850°C , the size of the particles increased to 15-35nm, the nanocrystalline LaCoO3 had a perfect rhombohedral perovskite structure. At 900°C , the crystalline phases of the lanthanum-cobalt mixed oxides were LaCoO3 and La2O3, and the amorphous component is Co2O3, the presence of lanthanum affects the crystallization of cobalt oxides. The LaCoO3 has excellent photocatalytic activities and 100% MO solution was decolorized only after 4h.
Effect of Geotextile and Prefabricated Vertical Drains Used in Soft Soil Foundation
Authors: Liu Jie Qun , Liu Jin Long
Published: February 2011

Based on the generalized formulation of two dimensional Biot′s theory of consolidation, the effect of geotextile and prefabricated vertical drains (PVDs) using in soft soil foundation was studied with nonlinear finite element method. The dissipation of excess pore pressure, vertical settlement and lateral displacement of foundation were contrasted between foundations with and without PVDs. It is found that the vertical settlements become lager, the lateral displacements become less and the bulges at the toe of embankment become less at the same time of consolidation when PVDs are used. And the stability of embankment improved for the bearing capacity of soil enhanced with excess pore pressure dissipated fast. Meanwhile, the axial force of geotextile become less when PVDs are used. Those changes showed that the design of foundation can be optimized by shortening the time of consolidation when PVDs are used.
Study on Active Control of Structural Frequency Response
Authors: Zhang Xing Wu , Chen Xue Feng , You Shang Qin , He Xiao , Wang Yi Jie , He Zheng Jia
Published: February 2011

As the requirements for industrial operation and military work, the frequency characteristics should be changed artificially sometimes. Active control is a good choice, but the current active control mainly focuses on time domain for vibration control. In this paper, the structural active control on frequency domain is studied through theory and experiment. Firstly, multivariable wavelet finite element method with two kinds of variables (TWFEM) which is suitable for modeling of great and complex structures with high efficiency and precision is used to construct the mathematical model for the controlled structure and do static and dynamic analysis. Then the control algorithm based on neural network including two parts, identification implement and controller is constructed. The present study takes frequency response as control objective, and can not only do vibration control but also change the vibration frequency characteristics, providing a new perspective for active control.
Tribological Properties of Serpentine Nanoparticles as Oil Additive under Different Material Friction Pairs
Authors: Qi Xiao Wen , Jia Zhi Nng , Yang Yu Lin , Fan Bing Li , Shi Lei
Published: February 2011

The tribological experiments of different metal frictional pairs were investigated by using MMU-5G friction and wear tester under oil-lubricating condition with serpentine powder additives. The upper and lower specimen pairs were 45 steel/45 steel, 45 steel/HT200 cast iron, HT200 cast iron/45 steel, HT200 cast iron/HT200 cast iron, respectively. Serpentine powder used as oil additive was characterized by transmission electron microscopy (TEM) and x-ray diffraction (XRD). Applying SEM and EDS, the surface morphologies of self-repairing coatings and their chemical compositions were detected. The test results revealed that self-repairing coating could be generated on 45 steel specimen surfaces. However, no obvious self-repairing coating formed on the worn surface in all tests which is mainly due to the unique microstructure of HT200 cast iron and the segregation effect of graphite.
Elastic Dynamics Analysis and Simulation of New Tire Building Drum
Authors: Yin Zi Xun , Guo Zong He , Cui Rong Jiang
Published: February 2011

A new type of variable topology parallel tire building drum mechanism was presented in this paper and the solid model of the mechanism was established. The elastic dynamics model has been established by the condition of displacement and power which the rigid connected with elastic body. The model of variable topology parallel mechanism was imported into the ADAMS and analyzed the elastic dynamic simulation of the mechanism.
Discussion of the Passive Shuttle-Type Control Technology Decreasing the Accident of the Nuclear Power Plant
Authors: Zhang Jian Ping , Zhu Jian Gong , Zeng Xiang Wei
Published: February 2011

Zeng Xiangwei researched the shuttle-type passive control system of pressure pipeline. He provided new technologies for specific media (such as Chemical industry, natural gas), specific environment (such as desert, forest) and operating system (such as water hammer, pulse). The significant technical difficult problem of the petroleum chemical industry, offshore platforms, nuclear power, defense, and other projects were solved. And these control components can work safely and reliably in 20 years. And this control system achieved complete-control or partial-control without outside power source. The shuttle-type passive control system of pressure pipeline expected to extend to the pressure pipeline system
Performance Optimization and Comparison of TMD, MTMD and DTMD for Machining Chatter Control
Authors: Wang Min , Zhang Yan Lin , Zan Tao
Published: February 2011

This paper investigates and analyzes the performances of several types of tuned mass damper (TMD) including common single TMD(STMD), multiple tuned mass dampers (MTMD) and dual tuned mass dampers (DTMD) on the machining chatter control. Considering the special nature of the machining stability problem, the optimal design parameters of the dampers are defined as those that minimize the magnitude of the real part of the FRF of the damped machining system. This paper demonstrates the performance of the optimally designed different TMDs for machining stability improvement by calculating the stability diagrams for the turning processes. The calculation results show that a more than 60% improvement in the critical limiting cutting depth can be obtained for the optimally designed MTMD (2 TMDs) compared to the optimally designed STMD, and a more than20% improvement for the optimally designed DTMD compared to the optimally designed MTMD(2 TMDs).
Study on Multi-Objective Optimization Design of Planetary Gear Reducer
Authors: Zhang Han , Shen Xiao Qin , Yu Fu Sheng , Liu Jian Hua
Published: February 2011

Various elements in planetary gear reducer design are discussed. A multi-objective optimization model is created. The model requires the minimum volume and the maximum contact ratio. The method of multiplication and division is used to solve the multi-objective problem, and the method of feasibility enumeration is used to handle the discrete variables. The results show that the optimal solution meets the actual requirements.
Simulation Analysis of Crash Tests for the Front Side Member in LS-DYNA
Authors: Yin Hui Jun , Jin Jian , Yang Ping Hui , Pan Yu , Ma Shu Kun
Published: February 2011

How to improve the collision process of safety performance has become one of the most important issue in the automobile manufacturing enterprises. This paper using LS-DYNA made a security analyses about former girders, based in half vehicle model, analyzing the security of the front side member to reflect the vehicle’s performance. At the same time, through the front side member’s assembly structure’s contrast with the modified ones, the result has proved the improvement is more effective.
The Obstacle-Surmounting Process Simulation of Arm-Swing Wheeled Robot Based on MATLAB
Authors: Gong Li , Ding Yu Feng , Sheng Bu Yun , Che Dong Dong
Published: February 2011

Considering complex environment of disaster site, an Arm-swing Wheeled Robot (AWR) with auxiliary obstacle-surmounting mechanism was developed. The obstacle-surmounting process is simplified into three stages, and the mathematic model of kinematic for each stage has been established. The simulation for each stage of obstacle-surmounting has been carried out in MATLAB. The stability of obstacle-surmounting is analyzed and the trend of resistance moment is obtained. Finally, the effectiveness of simulation analysis is verified by comparing with the test results of physical prototype.
Synthesis and Characterization of Polyimides Derived from Novel 1,3-Bis(4-Aminophenoxy)Benzene
Authors: Chao Min , Kou Kai Chang , Wang Zhi Chao , Wu Guang Lei , Zhang Dong Na , Zhang Jiao Qiang
Published: February 2011

A novel aromatic ether diamine 1,3-bis(4-aminophenoxy)benzene (TPER) was synthesized. Four kinds of polyimides were prepared with obtained TPER, 4,4’-diaminodiphenyl(ODA), pyromellitic dianhydride (PMDA) and end capped with phthalic anhydride(PA). The imidization process was solution imidization followed by solid-phase thermal imidization. The results of DSC, 1H-NMR and FTIR analysis showed that high purity TPER had been successfully synthesized. FTIR spectras of polyimides indicated the imidization process could reduce the final imidization temperature. The inherent viscosities([η]) showed molecular weight could be controlled via the introduction of flexible diamine and end capping agent. And all polyimides exhibited excellent thermal stability.
Modal Sensitivity Analysis of PCB
Authors: Hu Tao , Du Ping An , Ha John H.L , Liu Jian Tao
Published: February 2011

By studying a typical rectangle PCB, the design parameters affecting natural frequency of PCB are found in the paper. By theoretical deduction and finite element analysis, the sensitivity of the natural frequency of PCB with respect to the design parameters is analyzed, the influence of the design parameters on nature frequency is obtained, and some conclusions for structural optimization of PCB are drawn.
The Dynamic Property Analysis of Ink System in Offset Press
Authors: Zhao Ming Lei
Published: February 2011

The printing quality is decided by the ink system, which is heavy and complicated in offset press. Structure optimization and parameter modification is the key step of seeking better performance in the ink system. In this paper, the ink system of modern offset press was the research object, seeking the discrepancy of different structures and parameters. The surfaces of ink rollers and cylinders were discreted by computer simulation,based on this,established the math model of steady time in batch and continuous ink feeding system, then analysised the feeding system and vibration system. The simulation result indicates that the ink feeding system, the way of vibrator oscillation, plate coverage have great influence on the dynamic property. In batch ink feeding system, the property of ink system would be improved by increasing ductor roller swing frequency, and approached to continuous ink feeding system. On the machine with adjustable ductor roller swing frequency, the steady time would be reduced by regulating ductor roller swing frequency, improved efficiency with reducing paper wasting.
Analysis of Energy Absorption in Cutting Processes of Roll-Over Protective Structure of Engineering Vehicle
Authors: Zhang Ying Shuang , Wang Guo Qiang , Pei Chun Yan
Published: February 2011

This work is devoted to the development of a new type Rollover Protective Structure which absorbs the impact energy using shear energy absorber during a roll-over accident of engineering vehicles. A method is developed for investigate the energy absorption of the shearing processes using the finite element method coupled with the Cockroft-Latham fracture criterion, remeshing and element kill method accounting for nonlinear isotropic and kinematic hardening under the large plastic deformation. Comparing the simulation results with laboratory test results, the proposed method is valid. Using the finite element analysis method, the effects of shearing clearance, cross-section parameters and the shape of the shear edge on shear force and energy absorption of the process are investigated.
Finite Element Analysis of Static Characteristics of a Hydrostatic Guideway and its Effect Factors
Authors: Sun Ya Zhou , Liu Yi Lei , Liu Hai Tao , Liang Ying Chun
Published: February 2011

Guide ways of ultra-precision machine tools always have sufficient stiffness and guiding precision. But guide way rails deformation caused by oil film pressure and slider offset lead to oil film clearance change which affects static stiffness and guiding precision. An inside-slider hydrostatic guide way is designed, and its static characteristics are analyzed. As a result, the effect of slider offset on stiffness and guiding precisions is obtained. A FE model of guide way is established. An elastomer of virtual material properties is used to simulate oil film, so that the relationship between oil film clearance and pressure can be represented in a certain range. Static stiffness and guiding precision are obtained considering deformation of rails.
Optimization Design of Three Helical Tooth Star-Wheel Loading Mechanism Based on ACO
Authors: Li Xiao Huo , Jiao Li , Cao Yan Li , Liu Chun Hua
Published: February 2011

In order to decrease weight, reduce inertia and dynamic load of a three helical tooth star-wheel and improve its dynamic characteristic, an optimal design model targeting smallest weight of a three helical tooth star-wheel is established in the paper, the geometric parameters of the star-wheel are optimized with the combining methods of ant colony algorithm and finite element method. The weight of the star-wheel reduces by 16.5 %，the load coefficient increases by 20 % and the loading productivity raises by 19 % after optimized, these conclusions lay a foundation for improving the design, determining reasonably the size of the star-wheel loading mechanism, making better the performance of the three helical tooth star-wheel loading mechanism.
Mechanical Structure Optimal Design of 3D Non-Destructive Measurement System
Authors: Gan Yong , Zhong Jing Ru , Sun Ning
Published: February 2011

It discusses the measurement principle and the mechanical structure of 3D non-destructive measurement device for the homogeneous entity. The measurement project and its operating process is discussed. The basic operation principle and components of this measurement device are pointed out. Based on the modern design theory, optimization design, dynamical design, the mechanical structure of the device is analyzed and improved for assuring measurement precision, structural intensity, and vibration characteristic of the device. The primary experiment devices and their precision are designed and analyzed. Proved through principium experiment, the structure satisfies the request of the measuring precision. The mechanical structure of this measure device is effective and feasible.
The Solution of Problems in Cast Iron Dryer End Covers Designing
Authors: Lu Hong Yu , Tan Run Hua , Bian Xue Xun
Published: February 2011

Some researches have been done to solve the important problems, such as the shape of end cover and consequence part shear force and bending moment calculation. The solutions have been done by theoretical analysis. Formula and charts used in designing are given as follows.
Dynamical Analysis on Sugarcane Cutter Rigidity Enhancement
Authors: Lai Xiao , Li Shang Ping , Ma Fang Lan , Zhou Jing Hui , Zhang Zheng Zhong
Published: February 2011

Improving the cutting performance, especially the cutting quality of sugarcane harvesters is the most magnificent problem for popularizing the application of the havesters. Much research has been done on most effect factors but rare on the influence of rigidity enhancement of sugarcane cutter. Indeed, the rigidity of sugarcane cutter has notable influence on the quality of sugarcane cutting，as it effects its vibration and the vibration in turn brings great damage to the cutting quality. This paper analyzes how the rigidity of sugarcane cutter effects its working vibration by building up its mathematical model, then further investigates it by making a dynamical simulation analysis to compare two cutter structures with different rigidity based on ANSYS and ADAMS, and validate the actual effect of enhancing the cutter rigidity through a physical experiment. The result shows enhancing the rigidity of the cutter could lead to notable improvement of sugarcane cutting quality.
An Optimization and its Realization of Mast Crane Based on APDL
Authors: Song Shi Jun , Li Lei , Wang Ji Yong , Song Lian Yu
Published: February 2011

There is currently no relevant national design standards about mast crane, so there are many of its non-standard design and a variety of forms and no attention is payed to the rationality of the design. Therefore, optimal design of the mast crane steel structure has a significant meaning for design technology of mast crane. This paper refers to a kind of parametric optimization model based on Ansys OPT, combined with finite element analysis (FEA) and stability theory. The building process and the program structure of the parametric optimization model is introduced. Corresponding program is developed by using ansys parametric design language (APDL) , which extract some parametes from FEA results, such as weight and axial force, etc, and rapid optimization design of mast crane is realized. It has a referenced meaning for optimization design of steel structure of all types of mast crane.
Preliminary Study on Vertical Subsoil Participating Mass
Authors: Wang Guo Liang , Qu Shu Ying , Hou Xing Min , Zhu Feng Feng , Zhang Jia
Published: February 2011

A quantificational calculation method of participating mass of foundation vertical vibration is presented in this paper. Vertical subsoil participating mass of strip and rectangular foundation are preliminarily calculated based on Boussinesq’s solution of subsoil additional stress and equivalent-load method. That is, the subsoil participating mass can be calculated only prescribing the isoline of additional stress. The method is suitable for adopting by corresponding codes for it avoids considering complicated influencing factors of subsoil.
Modal Analysis of Ball Mill Rotator Based on FEM Technique
Authors: Men Qing Yi , Cheng Guang Wei , Han Yan
Published: February 2011

In this paper, the Φ3.8×13m centre drive ball mill is studied. After predigested the rotator with its mean characters, the FEM model of the rotator is established. After loading and solving to the rotator with FEM software ANSYS, the former ten modal natural frequencies and vibration modes are got. Through the modal analysis, the position which may be easily destroyed is found. Then the position of the partition board is moved, through the comparative analysis, a good project is carried out. The vibration modes are lessened, most of the vibration amplitudes are reduced, the vibration mode which has huge influence to the structure is avoided, and the dynamic performance of the rotator is improved.
Study on Vibration Reduction of Finishing Lapping Machine for Bearing Race
Authors: Man Jia , Zhang Lian Hong , Chen Yong Liang
Published: February 2011

It is key to improve the machining efficiency of finishing lapping machine to restrain the vibration that raise with work speed. The vibration amplitude is influenced by the excitation force of unbalanced crank-rocker mechanism and the anti-vibration performance of guide. Following improving schemes as adding counterweight to crank-rocker mechanism, adopting the light material motion components and enhancing the anti-vibration performance of guide are proposed based on theoretical and experimental studies. The improving schemes are verified by the experiment.
Quality Control of Heat-Treated Surface of 20CrMo Steel Transmission Countershaft
Authors: Wang Hong Mei , Wang Xiao Juan , Ma Xiao Chun
Published: February 2011

After heat treatment, the surface hardness and effective depth of hardened layers of automotive transmission countershaft, determines the quality of the part itself as well as the normal and reliable operation of the transmission assembly. The paper analyzes the specific reasons for such problems as soft zone on the hardened surface of transmission countershaft when proceeding with carbonitriding in the controlled atmosphere furnace, a multi-purpose furnace. And with process parameters adjusted, the process parameters of heat treatment are corrected that the soft zone has been eliminated and the quality of parts has been effectively controlled.
Characteristic and Forecast of the Error Cell on Machine Tool
Authors: Huang Qiang , Gao Chan Jun
Published: February 2011

In modern machine tool design, it is an important precondition of precision control to forecast accurately the relation between the final output precision of machine tool and its error cell. In this paper, the error cell characteristic of machine tool is described as the change of value and direction during the source error transfer. By supposing the source error of error cell as unit error, and forecasting their action effect, the characteristic of every error cell can be contained and compared. An example is provided lastly.
Simulation of Arresting Dynamics on the Carrier
Authors: Jia Zhong Hu , Tao Yang , Hou Zhi Qiang , Zheng Xiao Hong
Published: February 2011

The article puts forward a method for calculating the arresting force of carrier aircraft in the case the aircraft meets the cable off-center and the aircraft motion is unsymmetrical. The condition under which the hook will or will not slip on the cable is considered. Based on a great deal of numerical results, the article analyzed the impact of unsymmetrical motion and off-center on landing dynamics of carrier aircraft.
Experimental Investigation on Flow Boiling in Micro-Channel with R32/R134a
Authors: Guan Xin , Ma Hu Gen , Xie Rong Jian , Bai Jian Mei , Liu Hong
Published: February 2011

Mechanism of flow boiling heat transfer in micro-channel and mini-channel with non-azeotropic refrigerant mixture R32/R134a is studied in this paper. Experimental research is carried out at different mass flow rate, heat flux and quality. The difference of heat transfer in two single tubes is analyzed.
Optimization Methods and Application Research of Stator Cooling Pipeline in High-Speed Grinding Wheel System
Authors: Li Bei Zhi , Feng Rui Jin , Yang Jian Guo , Wu Zhou Ping
Published: February 2011

The paper aims at the problem of heat dissipation on the surface of stator of the Synchronous Motorized Spindle system, researching the influence which the shape of the cooling pipe’s cross-section and the wall thickness have on heat transfer. This paper presents the optimization design methods to confirm the best size and shape of cooling pipe’s cross-section and the optimal wall thickness, using MATLAB software to optimize calculation and NASTRAN finite element software for simulation analysis, and the ideal temperature of distribution is got, which is better than the result gained by the experience. It provides theory basis for the design of cooling pipe in practice.
Analysis of Formed Platelet Thermal Wrinkling in Platelet Transpiration Cooling
Authors: Hou Yong Fa , Liu Wei Qiang
Published: February 2011

Under thermal stress, the formed platelet of Liquid Rocket Engine (LRE) transpiration cooling structure may result in wrinkling. The stability of rectangular sheet with three simple supported-sides and one free-side is simplified as the model of formed platelet. Applying the Galerkin method for analysis, the relationship of the critical thickness of formed platelet and the transpiration width is obtained. Also, the influence of different material properties on the critical thickness is presented. The theory and method proposed in this paper are applicable for more complicated temperature distribution and also can be used to choose material for transpiration cooling.
Transfer Heat Mechanism of Oil-Gas-Water Three-Phase Flow in Pipeline
Authors: Mao Qian Jun
Published: February 2011

It is well known that the oil-gas-water three-phase flow belongs to the field of multiphase flow,transfer heat mechanism of which is very complicated.Transfer heat mechanism is affected not only by different buries in oil gathering pipeline, but also by soil temperature periodicity change. Both domestic and oversea scholars have already studied on the transfer heat mechanisms of oil-gas-water three phase,but they are still in the level of fundamental theory and laboratory.This paper establishes transfer heat models of the oil-gas-water three-phase flow in buried oil gathering pipeline, including the physical model and the mathematical model,and testing in experiment .The purpose of this paper is to analyze value between the calculation and the testing . The results show that the mathematical model of this paper is accurate , and the relative error is ≤ 10%.
Anisotropic Heat Analysis Using Hybrid Finite Element Model with Element Boundary Integrals
Authors: Wang Hui , Zhao Xin Juan
Published: February 2011

Anisotropic materials have been widely applied in practical engineering problems of interest. In the paper, the anisotropic heat transfer behaviors are analyzed using the proposed hybrid finite element model with Green’s function kernel. In the established weak integral hybrid functional, the element internal field being approximated with the combination of Green’s function satisfies a priori the governing partial differential equation and the independent frame field is assumed to link the internal field. As a result, the solving linear system of equations with boundary integrals only is obtained and the constructed elements show anisotropic feature. Two numerical examples are given to show the convergence and accuracy of the proposed approach, and the effect of ply angle of orthotropic material principal direction on the temperature distribution is discussed to investigate heat transfer mechanism in anisotropic materials.
Simulation of Drive System for some Type of Amphibious Armored Vehicle Based on AMESim
Authors: Su Li Gang , Duan Lu Qian , Liu Chang
Published: February 2011

How to use simulation software AMESim to build the drive system model of some type of armored assault vehicle is introduced. Accelerating and steering on various kinds of roads and those with different gradients are dynamically simulated. The analysis of the performance parameters changing with time of each gear, driving shaft, hydraulic steering gear, driving wheel and engine will provide theoretic references for improvement of this vehicle.
Study on Practice Teaching of Engineering Colleges or Universities
Authors: Yao Yan Sheng , Zhang Ke Ren , Dahua Li , Ma Yu Ping
Published: February 2011

Engineering practice education is important for engineering college students, but it needs the support of infrastructure and human input. With the number of students expanding dramatically in many local colleges or universities since the 21cn, resources of practice teaching can not meet the requirements of personnel training. With the development of the society and technologies, old practical teaching model also can not adapt to the demand of human resource market. This article presents the status of the current practice teaching and sums up many problems of local colleges and universities. In addition some reform ideas and exploration are presented in Anhui University of Architecture （AUA）
Study of Interdisciplinary Specialized Mechanical Engineering Education
Authors: He Ping , Chen Nai Chao , Wu Jiang
Published: February 2011

A novel teaching method is proposed to design the contents of the interdisciplinary courses for the specialized mechanical engineering education. The paper discusses the necessity of assigning the proper interdisciplinary courses on the analysis of currently increasing mixed-talent requirement in our modern society. The characteristics of interdisciplinary research are elucidated in order to obtain the hints for guiding the reform of teaching method to suit for the new status that occur in the interdisciplinary course. The relationships and intersections among the different majors are regards as the most important factor for teaching the interdisciplinary courses well. Refining the associated knowledge from these intersections is the core task for teachers since these contents are very easy to avoid the intense inner anxiety and conflict for the student due to the difference between the own and other majors. For the teacher, the contents of lessons should be designed on the basic of the specialized skill of student’s major and not exceed their knowledge structures on a large degree. Based on this behavior, the detailed knowledge of specialized mechanical engineering is gradually assigned in the classes and terminally the whole specialized industry is learned by the student, which is the desired goal. Finally, the example of electrical machinery is addressed for verifying the effectiveness of the approach of refining the intersections to design the contents and classes. The practical results show that the method proposed in this paper has the high effectiveness on teaching the interdisciplinary specialized mechanical engineering education. In addition, we believe that this schema is also able to be applied for the related interdisciplinary courses.
The Influence of WH-II Super Set-Retarding Agent on the Heat of Hydration and Indices of Portland Cement
Authors: Gao Chao , Gao Shao Xia , Chen Hong Zhou
Published: February 2011

This paper study on effects of WH-Ⅱ super set-retarding agent on the hydration,the heat of hydration,the setting time and strength of Portland cement The author does test on the hydration with the methods of XRD and SEM.The results show that fitful amount of WH-Ⅱ super set-retarding agent is effective on retarding the setting time and improving the strength of Portland cement.
Research on Residence Common Value
Authors: Gao Zhi Jian , Xiao Ji Jun , Liu Xiao Jun
Published: February 2011

This paper reviews the concept of customer value and its development at home and aboard. As there are still problems in our country’s housing industry development, it will be limitation to study housing value using customer value theory. The author argues that the view angle should be changed to research housing value, and raise the concept of housing common value. The author also analyzes components of residence common value.
Optimization Design of the Lawn Mowing Vehicle's Blade Based on Aerodynamics
Authors: Zu Li , Zhang Lei , Wang Hua Kun
Published: February 2011

In this paper, air movement states within the cutter deck caused by high-speed rotating blades are studied, impacts on the mowing blade by the air movement are analyzed with the consideration of the cutter structure. It will provide important references for the blade optimal design. By Computational Fluid Dynamics (shortened as CFD) method, the high relative speed motion model between the blade and air flow is established, the flow field through the blade tip section are simulated, and the instantaneous movement of air flow around the blade can be known. By the analysis of the aerodynamic influence, the optimized design of the mowing blade can be achieved. The lawn mowing vehicle with the optimized blade can have a good and stable flow conditions when cutting the grass, the performance and the value of the vehicle thereby are enhanced.
Analysis on the Incentive Decision of Manufacturing Logistics Outsourcing
Authors: Chen Jia Juan , Zhou Si Si , Guo Ying , Han Xiang Yu
Published: February 2011

The logical relationship of manufacturing and logistics industry joint development is analyzed using system dynamics approach. Factors that affect Manufacturing Logistics Outsourcing were summarized as economic factors, technical factors, risk factors and external factors. Principal-Agent Model is established to analyze the decision-making process of logistics outsourcing in manufacturers and logistics companies.