bluuebunny/crossref_metadata_2025 huggingface dataset:
Effects of Temperature on Tensile Strength of Carbon Fiber and Carbon/Epoxy Composite Sheets
Authors: Cao Sheng Hu , Wu Zhi Shen , Li Feng
Published: February 2012

With the increased use of carbon fiber reinforced polymer (CFRP) composites in civil infrastructure, understanding the fire structural performance of these materials is an important safety issue. In this paper, the effect of temperature on the tensile strength of carbon fibers and carbon/epoxy composite sheets was experimentally determined from 20°C to 500°C. Meanwhile, in order to better understand the strength degradation of carbon fiber-polymer composites at elevated and high temperatures, the tension tests were also performed for pure epoxy resin and CFRP sheets by means of 10°C off-axis at the range of 20-80°C, respectively. The experimental results reveal that the strength decrease of carbon composites under tensile loading at elevated and high temperatures is dependent on both thermal softening of the epoxy polymer matrix and thermally-activated weakening of the fibers. The reduction in strength of carbon fiber is attributed to oxidation of the high strength grapheme layer at the near-surface fiber region.
Low Carbon Economy and Sustainable Energy Development in Rural Areas of Sichuan Province, China
Authors: Bao Wen
Published: February 2012

Sichuan Province faces several development challenges including those linked to climate change. Energy usage in Sichuan Province, for example, is already constrained because of a range of development challenges (energy availability; access; affordability of alternative energy sources; and a range of health impacts, including air pollution). There calls for a transition to a low carbon energy options. Although the major obstacles preventing people from discontinuing domestic traditional biomass fuels or coal combustion are poverty, the ready availability and social acceptability of energy options cannot be underrated. This paper therefore highlights some of the persistent challenges associated with sustainable energy transitions in Sichuan Province. We aim to explore how renewable and low-carbon energies can maintain sustainable rural energy development and partially replace fossil fuels development in rural areas of Sichuan Province and thereby serve as mitigation options is a possible future transition towards a low-carbon system relying on renewable and low-carbon energies.
Pass Design Method for Rolling Titanium Alloy Rod
Authors: Shuai Mei Rong , Huang Qing Xue , Qin Jian Ping , Pan Lu
Published: February 2012

In order to improve formability of Titanium alloy, the three-roll mill is used instead of two-roll during continuous rolling titanium alloy rod. Considering that the filling coefficient of titanium alloy rod is different from that of ordinary steels, a new pass design method has been illustrated in this paper. Based on the orthogonal experiment and finite element method, the spread formulae for round rod and triangle rod have been developed, and the program composition of pass for rolling TC4 rod has also been is used in experiment. The results showed that the proposed method is reasonable and could produce the qualified products.
Investigation of Microstructure Characterization and Machinability of the B4C/BN Nanocomposites Bulks Fabricated by Chemical Reaction Process and Hot-Pressing Process
Authors: Jiang Tao
Published: February 2012

The B4C/BN nanocomposites were fabricated by hot-pressing process in this research. The B4C/BN nanocomposite powders were fabricated by chemical reaction and heat treatment process. The B4C/BN nanocomposites sintered bulks were fabricated by hot-pressing process at 1850oC for 1h under the pressure of 30MPa. In this research, the phase composition, microstructure, mechanical property and machinability of the B4C/BN nanocomposites fabricated by hot-pressing process were investigated. The XRD patterns results showed that there existed the B4C phase and h-BN phase in hot-pressed B4C/BN composites. The microstructure of the B4C/BN nanocomposites was investigated by SEM and TEM. The SEM micrographs showed that the B4C/BN nanocomposites bulks exhibited the homogenous and compact microstructure, and the h-BN particles were homogenously distributed in the B4C matrix. The TEM micrographs showed that there existed the weak interface between the B4C matrix grains and h-BN particles, as well as the microcracks within the laminate structured h-BN particles. The mechanical property of the B4C/BN nanocomposites decreased gradually with the increase of h-BN content. The B4C/BN nanocomposites exhibited the high mechanical property. The machinability of B4C/BN nanocomposites increased gradually with the increase of h-BN content, the drilling rates of the B4C/BN nanocomposites increased gradually with the increase of h-BN content.
Dynamic Modeling and Acceleration Control of Electric Vehicles
Authors: Liu Xiao Long , Zhu Shao Peng , Wu Zhi Jun
Published: February 2012

This paper constructs a dynamic model of a four-wheel drive electric vehicle, which contains a vehicle model and a brushless DC motor model. In order to improve the starting and acceleration performance of the electric vehicle, we design a speed and current double closed-loop speed control system based on the constructed dynamic electric vehicle model. The starting and acceleration process of the electric vehicle is simulated and analyzed by CarSim-Matlab/Simulink co-simulation. The effectiveness of the speed control system is evaluated by the co-simulation results. In addition, the robustness of the speed control system is also analyzed for different vehicle masses.
Realization of A Data Communication Card for A High Speed Digital Electronic Engraving Machine
Authors: Ni Zhong Jin , Fang Liang , Chen Mao Jun
Published: February 2012

As the digital electronic engraving machine needs high speed and credible communication between a host computer and a slave computer, a data communication card for a high speed digital electronic engraving machine is designed and realized using PDIUSBD12 IC and S3C44B0X IC. PDIUSBD12 IC is USB interface device with parallel bus. In the paper, hardware circuit is described, USB driver program is depicted in detail based on the µC/OS-Ⅱ operation system, and the ways and means of debugging the data communication card are given. It has been experimentally validated that the data communication card is applied successfully and works steadily in high speed digital electronic engraving machines.
Synthesis of γ-Bi2MoO6 Spheres and their Photocatalytic Activities for Degradation of Rhodamine B
Authors: Wang Shang Feng , Xu Jian , Zhang Yuan , Guo Chang Sheng , Li Xiao Chen
Published: February 2012

A highly efficient γ-Bi2MoO6 photocatalyst was synthesized by a solvethermal method with the assistance of urea. The structure, morphology and photophysical properties of the Bi2MoO6 were characterized by X-ray diffraction, scanning electron microscope, UV–vis diffuse reﬂectance spectroscopy and nitrogen adsorption-desorption techniques. The photocatalytic efficiencies were evaluated by the degradation of rhodamine B (RhB) under visible-light irradiation, and the γ-Bi2MoO6 structures displayed significantly higher visible-light-driven photocatalytic activity in comparison to TiO2 nanoparticles.
SWOT-PEST Analysis of China's Dry Port
Authors: Chen Ju Hong , Wang Yuan
Published: February 2012

Dry ports are blooming quickly recently in China. The concept of dry ports was discussed and analyzed in this paper, SWOT-PEST method was used to study the environment of dry ports in China, and the suggestions to the development of China’s dry port were given at last.
Reliability Test Platform for High-Speed Motorized Spindle Based on Magnetic Loading
Authors: Hu Ye , Yang Zhao Jun , Zeng Xiao Ming , Song Jin Gan , Fang Jie , Wang Kai , Zhu Yan
Published: February 2012

In order to accurately emulate the operation conditions of high-speed motorized spindle in the reliability experiment, a dynamic loading system is proposed. This system allows simultaneously loading torque, radial and axial force against the spindle. The torque load is carried out by the electric dynamometer; the non-contact vibration exciter completes the radial load; the axial load is carried out by a self-made electromagnet. Moreover, this system also can detect out the basic features and failure data of the motorized spindle during the loading. And these sampling data provide a quantitative elevation for its reliability analysis. This paper presents a simple solution to the high-speed motorized spindle reliability research where the loading experiment is designed with the spindle whose maximum rotational speed is 18000rpm.
Effects of Geometric Misalignment Caused by Girth Weld on Fatigue Behavior of a Cylindrical Pressure Vessel
Authors: Abbas Musharaf , Qayyume Rehan , Afridi Jamal Hussain
Published: February 2012

The paper presents the results of finite element analysis of a pressurized vessel typically made of steel 1025 and containing the weld misalignment at the cylinder-to-cylinder junction. This misalignment considered in the vessel’s structure is because of girth weld that is found in most of the fabrications of such type of structures. Geometric misalignment of 50% of thickness is considered for this particular study. The work evaluates the geometrical effects of misalignment on the fatigue behavior of the pressure vessel to quantify its consequences in term of fatigue life and maximum damage. Finite Element (FE) analysis is performed by the use of ANSYS on one quarter of the structure due to symmetry. A significant effect of misalignment on fatigue life of the cylinder has been found and is presented with maximum anticipated damage in the critical areas.
Influences of Particle’s Friction Coefficient on Tribological Behaviour of Third-Body Interface
Authors: Wang Wei , Liu Xiao Jun , Liu Kun , Shen Jin Long
Published: February 2012

Based on discontinuous mechanics, the non-fluidized particles flow lubrication model in tilting pad tribopairs is proposed by the discrete element method (DEM). The influences of the particles’ friction coefficient have been investigated mathematically. The wettability and adhesion ability between particles and rubbing surfaces are weaker than fluid lubricant, but its fluid-like properties distinguished it from solid lubricant. These reasons endow particles flow with some unique characteristics as a lubricant. The results indicate that the peak of load profile and friction force profile is located at the inlet zone of tilting pad under particulate lubrication. Particles with a lower friction coefficient can decrease the system friction coefficient and increase the load capacity of tribosystem, which provided helpful guidance to engineering application. The study of the microscopic characteristics which included the mean contact force, body energy, contact friction energy and particle kinetic energy has been carried out at the same time.
Parameter Identification of LuGre Friction Model for Robot Joints
Authors: Zheng Ya Qing
Published: February 2012

The LuGre friction model well captures most of the friction behavior, but it was very difficult to identify the parameters of the LuGre model. The LuGre friction model, theory of static and dynamic parameters identification of the LuGre model as well as the algorithm based on particle swarm optimization are summarized according to the previous work. Then the programs for the static and dynamic parameters identification are made and analyzed in the environment of Matlab software in detail, and the identification results are given. The work mentioned above will lay the theoretical foundation for the future experimental validations and provide the detailed models, algorithms and programs for the corresponding research issues.
Research on Experiment and Technique of Material Identification for Debris of Engineering Equipment Based on Computer Vision
Authors: Tu Qun Zhang , Pan Ming , Zhao Jian Xun , Su Da Zhen , Wang Guo Tao
Published: February 2012

Based on micro-image, the material identification of iron and copper debris in working oil of engineering equipment is researched. By selecting four characteristic parameters of debris image, a debris recognition classifier is designed based on multi-SVM. The materials and types of debris can be fast identified after the model is trained and the identification accuracy is high, thus a new method for fault diagnosis of engineering equipment is provided.
A Wear Life Predication Based on Partial Least Squares under Boundary Lubrication
Authors: Yan Yu Tao , Sun Zhi Li , Hu Guang Wei
Published: February 2012

The wear experimental project on main influencing factor with load, sliding speed, surface hardness and lubrication was instituted by the uniform design, the wear properties were investigated on a MMW-1 friction and wear tester. The predication formula for wear rate was defined. The wear rate predication model was established by the partial least squares based on the test data, the influencing degree on the main influencing factors was analyzed, the results show the influence on wear rate from big to small is in turn load, lubrication, surface hardness and sliding speed. The lubrication property improved is a handy valid path to decrease the wear rate. The check results show that it is a valid method by partial least squares to establish wear predication model based on test data.
Erosion of Elbows in Oil and Gas Production Systems
Authors: Ming Bo Wang
Published: February 2012

This paper gives an overview of erosion mechanisms in elbows in oil and gas production systems. The nature of the erosion process itself makes it very difficult to develop some definitive methods or models to prevent or predict the erosion in elbows in all conditions. This paper provides a review of the subject which will help petroleum engineers to handle the erosion problems in oil and gas industry. This review is given of different erosion mechanisms connected with sand erosion and the factors that influence them, and then the review goes on to look at particulate erosion in elbows in more details. Conclusions are then drawn based on the above analyses.
A High-Performance Heat Exchanger Using Modified Polyvinylidene Fluoride-Based Hollow Fibers
Authors: Li Baoan , Fan Han Han
Published: February 2012

Plastic heat exchangers has the shortcomings of bulky, thick pipe wall with large thermal resistance, poor heat transfer, aging of plastic and a narrow temperature range. The key to increase the heat transfer performance of heat exchanger is improving thermal performance of heat conduction.To enhance heat transfer effects and expand the temperature range of using plastic heat exchanger, PVDF with good temperature resistance is used as matrix and modification with graphite fillers to prepare composite hollow fiber which has the advantage of small diameter, thin wall and good thermal conductivity. Also, composite materials hollow fibers are used to prepare shell and tube hollow fiber heat exchanger.The testing of "water - water" system for our heat exchanger module has been done, and the results indicate that adding graphite is helpful to improve thermal conductivity of PVDF-based heat conductive hollow fiber heat exchanger to a certain extent.hen the content of graphite is 3%, the heat transfer effect is the best.
The On-Line Detection for AC Contactor’s Vibration Noise
Authors: Wu Xiao Mei , Zhang Ren Cheng , Yang Jian Hong
Published: February 2012

In order to make the AC contactor’s working noise measured under enviroment with strong backgroud noise, a kind of noise detecting system is developed based on LabVIEW. Firstly,a vibrating signal is obtained by acceleration transducer;Then a noise value is figured out by using sound radiation efficiency index curve and A weighting curve. The results indicate that the measuring precision is 2dB. The noise detecting system meets the precision demand of noise detecting.
A Double Thick Beam FEM with Explosion Resistance Dynamics Analysis Based on Spline Wavelets in Underground Structure
Authors: Liu Han Yi , Su Gan Long , Ou Yang Qing , Su Qing
Published: February 2012

Isoparametric B-spline wavelet functions can provide excellent approximation for smooth functions. In this paper, the response of composite laminated plate subjected to explosions is analyzed by using a double thick beam FEM mode based on the spline wavelet function. This mode, which can be considered in the distribution of normal stress and transverse shear stress simultaneously, is very important in the analysis of thick plate or blast-damage mechanism. The mode in analyzing underground structure and earth medium respond has the advantage of high precision and fast constringency and is easy to establish a element displacement function. The comparison between simulative and experimental results shows the effectiveness and precision of this method.
Numerical Simulation Study on Healthy Monitoring of the Framework Based on Aseismatic Behavior
Authors: Yang Xiao Ming , Wang Jun Yi
Published: February 2012

Considering back and forth and the complexity of earthquake loading, according to theoretical analysis, this paper is verified theoretically that the natural frequency changes of structure contain the information such as location and degree of the damage in earthquake, based on this theory, applying the large common software – ANSYS, and an experiment to simulate the damage of a six-storey-high frame structure is used, extracting the natural frequency changes and forming the input vectors of the neural network, the structural damage is detected by the neural network trained, the result showed the effectiveness of this method in the engineering.
A Case Study on Car Body in White Modal Analysis
Authors: Li He , Geng Zhi Yuan , Li Ye , Wang Li Juan
Published: February 2012

To make the structure of the car more rational, we established a modal test system of car's body-in-white in this paper. In experiments, we use the method of single-point excitation and multi-point collecting vibration, PULSE 12.5 modal test consultant and Mescope modal analysis software. Meanwhile, the excitation point is in the front of the load beam of better rigid. Through the system, different order modal frequencies and modal characteristics of body in white are computed. The modal analysis results and frequency characteristics of the car’s excitation are compared and analyzed, and they can supply the reference standard for dynamic design and revision．
Analysis of Slope Stability Based on DE-BP Neural Network
Authors: Bu Na Rui , Bai Run Shan , Li Zhang Zhen , Lin De Zhong
Published: February 2012

Analysis of slope stability based on BP neural network, the analytical model of slope stability is built. Aiming at the defects that BP neural network is likely to fall into local optimum in the progress of parameter optimization; DE is associated to put forward the DE-BP neural network prediction model that is coded by real numbers. The results show that this model has a high precision for the analysis of slope stability. It is feasible and efficient to analyze slope stability based on BP neural network.
Research on Optimization of China’s Urban Indemnificatory Housing Supply
Authors: Li Zhi Qing , Tian Jin Xin , Song Tian Hua
Published: February 2012

The contradiction between the effective supply and the uncertain demand in housing security system, which is an important part of the urban social security system, has been a major obstacle to urban sustainable development since 1998, and how to effectively deal with it is becoming more and more important. In this paper, the uncertain demand of indemnificatory housing, which was caused by the rapid urbanization, is considered, and the models for indemnificatory housing provision under box constraints, ellipsoid constraints and polyhedral constraints are constructed respectively by using distributional robust optimization, and at the same time, the reliability of optimal models in theory is proved in the form of theorem. In the end, as application of models, the paper takes Beijing as an example, and conducts empirical research on provision of indemnificatory housing during the past five years (2006-2010), which shows the effectiveness of the method.
Preparation and Characterization of CdS by Evaporation and Cu2S Complex Photoelectric Thin Films
Authors: Sun Sheng Nan , Liu Shi , Xu Feng , Cao Li Fen , Cao Jia Jia , Wang Jing , Ma Li Min , Cui Hai Ning
Published: February 2012

Cadmium sulfide (CdS) film by evaporation deposition and CdS/Cuprous sulfide (Cu2S) complex film by dipping were obtained on glass substrates. The influence of different annealing temperatures was investigated. Scanning electron microscopy (SEM) demonstrates CdS films are continuous, homogeneous. X-ray diffraction (XRD), photoluminescence (PL) and Raman spectra reveal the CdS films were hexagonal structure and 400°C is favor of the crystallization and aggregation. The conductivity of CdS/Cu2S complex film is better than that of CdS film.
Identification of Cabin Noise Source Based on Wavelet Transform
Authors: Huang Wei , Hou Liang , Lai Rong Shen , Lin Sen Quan
Published: February 2012

In order to solve the problem of error and abstract in the identification process caused by current wavelet methods using grayscale to identify noise sources, a cabin noise source identification method based on wavelet transform(WT) was proposed. Firstly, multi-wavelet reconstruction signals were constructed from original time-domain signals through Matlab Wavelet Toolbox. Secondly, the eigenvectors were defined by calculating the energy value of reconstructed signals at all levels. And the correlation coefficients between cabin noise signal and other signals were obtained by these eigenvectors. Then the extent of vibration or noise energy radiation influence on the cabin noise was estimated by the size of correlation coefficients. Finally, an example was also given to show the effectiveness of the method.
The Numerical Simulation for Vibroacoustic Phenomena of a Slender Elastic Shell
Authors: Yang Zhi Xi , Qiu Sheng Hua
Published: February 2012

The vibroacoustic phenomena for the slender elastic thin shell filled with water by finite element method is introduced in this paper. The unsymmetric (u, p) variational formulas and finite element procedures are implemented for 3 dimensional structures of vibroacoustic environment based on the displacement field u and the fluid acoustic pressure field p. As illustrated by numerical examples, the longitudinal acoustic pressure eigenmodes will be occurred besides the transverse bendable eigenmodes of the slender shell, nonetheless the eigenvalues and the order of eigenmodes for the fluid acoustic pressure field can only be determined by the flexibility and geometry stiffness of the slender shell.
The Noise Control and Research of Vibration Slot in Vibrating Conveyor
Authors: Li Shan , Xu Liang , Zhang Yu
Published: February 2012

Vibration slot, which is connected by the framework welded by the angle and the u-shaped slot formed by the stainless steel plate bending with fasteners, is an important part of the vibrating conveyor. The major function of vibration slot is carrying and conveying material. Due to vibration slot owning the thin plate structure and the flat large feature of surface, it is the primary noise source of vibrating conveyor. Therefore, it is very important to research and control the surface radiation noise of the vibration slot for reducing the noise of vibrating conveyor. This paper, through combining the finite element and the boundary element, researches noise radiation of vibration slot and understands the main noise source of vibration slot and radiation condition. The natural frequency of vibration slot, the vibratory response of vibration slot and the noise radiation of vibration slot are researched by inputting different structure parameters. Through analysis and comparison, some regularity conclusions that will provide a basis for the noise reduction of vibration slot are summarized .
The Generation Principle and Mathematical Models of a Novel Spherical Gear Drive
Authors: Wang Jian , Hou Liang , Luo Shan Ming
Published: February 2012

A new type of spherical gear drive, which takes micro-segment involute profile as tooth profile, is presented in this paper. The generation principle of the spherical gear is described. The mathematical models including the equation of micro-segment involute profile, the equation of the conjugate tooth profile and the engagement equation, are established based on the meshing theory. This new type of spherical gear drive has the potential to improve the load capacity and the performance of spherical gear transmission.
Study on Knowledge Service Supporting Product Innovative Design
Authors: Cao Wei
Published: February 2012

The key factor of product innovation design is analyzed in this paper. Among these factors, the construction of product innovation design knowledge service system is most important to enhance ability of innovative design. The process of innovative design is divided into conceptual layer, system layer and parts layer, and that the design process and knowledge class of different layer is totally different. Innovation design process of products is always along with the flow and inte-gration of different knowledge. The integration pattern and evaluation formula of knowledge ser-vice is put forward in the paper and finally the knowledge service system supporting innovation design in distributed resources.
Research on Block Thin Film Hydrostatic Guide Rail of Precision Grinding Machine for Optical Manufacturing
Authors: Jiang Tao , Guo Yin Biao
Published: February 2012

2MK-1760 is a grinding machine used in large scale optical lens manufacturing. To meet the manufacturing requirements, the block thin film hydrostatic guide rail is applied. In this paper, the structure of block thin film hydrostatic guide rail is proposed. In order to get the thickness and the stiffness, design calculation is performed. Experiments are carried out to verify that the feasibility and the validity of this technique.
Multidisciplinary Simulation and Design Optimization of a Variable Cross-Section Cantilever Beam
Authors: Li Zi Peng , Li Wen Qiang , Li Yan
Published: February 2012

Abstract. Aiming at the need of multi-objective optimization design of the common beam in engineering, this paper optimized the beams’ carrying capacity and anti-vibration ability based on optimization design platform of Isight, which integrated ProE and Ansys software. Through automatic iteration of the beam’s 3D modal data and simulation results, one ideal optimization solution can be obtained by using NLPQL algorithm. Compared with initial design, optimization Results’ performance parameter improved markedly. This standard method and steps can be promoted to engineers, which involve beam’s finite element analysis and design optimization.
Dynamic Characteristic Analysis of Inertial Navigation Platform' Structure
Authors: Zeng Wen , Xia Hong Mei , Wang Yu Xing , Wang Liu Yi
Published: February 2012

The three-dimensional solid model and finite element model of an inertial navigation platform, is established by using ANSYS software. A modal analysis has been carried out. The former 6 ordered nature frequency and modal shape have been obtained and kept away from the frequency of Laser Gyro. The finite element model of the system vibration is established and is analysed for harmonic response. The calculation data show that vibration amplitude is very small and has no influence for the Laser Gyro working. The theory modal data is the same as the modal test results, so it manifests the accuracy and effectiveness in the modeling and analysis.
Innovation of Men's Fashion Design of China Based on the Humanistic Philosophy
Authors: Shen Lei , Xu Jing , He Yi Jun
Published: February 2012

Humanistic design is a continuous progress design concept with the needs of the society, the purpose of humanistic design is to supply products continuously to meet people's increasing material and cultural needs. This paper describes the design concept of the humanistic content, the germination of the humanistic design in men's fashion industry from a historical point of view of China, makes an analysis of development opportunities of the humanistic design from macroeconomic and the consumer market, and specifically points out that the trend of men's design innovation of China, sums up the necessity of persisting to the humanistic design thinking to guide for men's product design.
Numerical Research on Performance Prediction for Aquatics Hub Cutter
Authors: Wang Yong Ding , Shen Wen Lei
Published: February 2012

Hub cutter is a new kind of plant cutters, with a good capability of anti-blocking and a good stability of operating performance. Hub cutter was simulated by using commercial code FLUENT in order to get the dynamic pressure and integrative data about the field of dynamic pressure. The results showed that the change of surface pressure on the hub cutter is large. And the pressure side received large impact force. It provides a theoretical basis for the design of pressure side and suction side of hub cutter. The study shows that using FLUENT simulation results to predict performance of hub cutter is feasible. The method can be applied in engineering practice and is an innovative design with FLUENT.
Property Tests and Mathematical Model for Magneto-Rheological Fluid
Authors: Guo Wei Yang , Xu Zhao Dong , Guo Ying Qing , Zhang Xiang Cheng , Zhou Yi Qiu
Published: February 2012

The magnetic particles coated with the carbon are used in the magneto-rheological fluids (MRFs) and the coat-like structure slow down the sedimentation of MRFs. Meanwhile, after the performance tests, the new MRF has the low viscosity and good ability of the recovery. These characters have more advantages in the application fields. Based on the prepared MRF, a shearing model that considers the interaction force between the adjacent chains was presented. By applying the proposed model, some conclusions are reached. The volume ratio of the magnetic particles has an important effect on the yield stress of the MRFs. The shear strain where the maximum shear stress happened has something to do with the volume ratio of the magnetic particles.
Design and Research of Double-Drum Winch with Anti-Pressure Wheel
Authors: Yu Kai An , Yang Tao , Gong Chang Zhi
Published: February 2012

In view of the problems of large stress and severe bearing heating in double-drum winch at present, this paper adopted a new method to enhance bearing capacity for double-drum winch by adding anti-pressure wheels between two drums. Finite element methods were used to analyze the strength of 4000kN-traction double-drum winches with anti-pressure wheels and without anti-pressure wheels respectively. The results of the analysis revealed that the stress of the cylinder bearing decreased from 264MPa to 167MPa. The new method by adding anti-pressure wheels had remarkably improved the endurance of the bearing. Therefore, the design method can be widely used in large-traction double-drum winch.
Evaluation Model of Conceptual Design Scheme Based on Engineering Fuzzy Set Theory
Authors: Miao Hong Bin
Published: February 2012

The evaluation of conceptual design schemes of mechanical products is an essential problem in the process of its conceptual design. At the stage of conceptual design, whether a correct and objective evaluation can be made on these design schemes will ultimately decide a good or bad performance, even its success or failure. The evaluation of conceptual design is a semi-structural decision-making that includes qualitative indexes and quantitative indexes, so it is difficult to select the best design concepts from a number of schemes. Therefore, an evaluation model based on the engineering fuzzy set theory is developed in this paper. First, the paper makes a detailed hierarchy analysis of evaluation indexes system and constructs some evaluation units according to evaluation indexes system. The whole evaluation of schemes is translated into a series of evaluation of basic units or comprehensive cells. Second, a multi-pole fuzzy pattern recognition model based on the engineering fuzzy set theory is established and the relative membership degree matrix can be obtained by the model, the matrix shows the order of excellence. An example is given for demonstration of its application. It shows that the method is feasible and reasonable.
A Simple Dynamic Model for Beams Subjected to Blast Loads
Authors: Yin Z.N.
Published: February 2012

A three Degree-of-Freedom (DoF) mass-spring model is proposed to predict the dynamic response of clamped supported beams subjected to blast loads at the mid-span of the beam. The stiffness of inelastic spring is defined from the relationship between force and mid-span displacement of beams subjected to blast loads. The lumped mass is calculated from the equivalency between the model and beam based on the fundamental frequency. Clamped supported solid beams and T-beams are taken as typical examples to verify the proposed model. And the influence of geometric parameters on deformation behavior is discussed in details.
Glass-Forming Ability and Crystallization Kinetics of Hf-Ti-Cu-Ni-Al Bulk Metallic Glass
Authors: Chen Tie Jun
Published: February 2012

Multi-component Hf45.6Cu27.8Ni9.3Ti5Al12.4bulk metallic glasses (BMGs) were prepared successfully by casted into the water-cooled Cu mold. Characterization of the casted Hf45.6Cu27.8Ni9.3Ti5Al12.4rods was carried out by X-ray diffraction. The thermal stability and crystallization kinetics were followed by differential scanning calorimetry. The results show that the alloy Hf45.6Cu27.8Ni9.3Ti5Al12.4had a critical cylindrical rod diameter for glass formation, Dc, of 7 mm and the largest cross-sectional diameter (about 12.4mm) can be obtained in the ideal condition. The critical cooling rate for glass formation is 6.48K/s. The Hf45.6Cu27.8Ni9.3Ti5Al12.4BMG has larger glass forming ability and higher thermal stability.
Applications of Cultural Ant Colony Optimization in Optimal Excavator Mechanisms Design
Authors: Xie Pei Qing , Lin Shu Wen
Published: February 2012

In allusion to the low efficiency and unsatisfactory result of the tradional optimization algorithms in existence for engineering design optimization,this paper proposes a cultural ant colony optimization(CACO) algorithm for application in design optimization of excavator’s mechanisms to improve the excavator’s performance efficiently. Through testing and verifying experiments,it is concluded that CACO can discovery knowledge during optimization process and use the knowledge to guide the heuristic searching process,furthermore,it is an appropriate algorithm for the optimization of excavator mechanisms. CACO costs less time and can get better quality solution to improve excavator’s main porformances.
Finite Element Analysis and Multidisciplinary Design Optimization of Diesel Engine Connecting Rod Based on ISIGHT
Authors: Yao Shou Guang , Zhao Sheng Chen , Liu Fei
Published: February 2012

Based on the multidisciplinary design optimization method and the MDO software ISIGHT, the 16PA6STC diesel engine connecting rod was taken to the model, used the Pro/engineer software to build the 3D model of connecting rod. The software ANSYS and Nastran was taken to complete the static analysis and modal analysis to get the maximum equivalent stress and the first and second modal frequencies. the software including Pro/Engineer、ANSYS、Nastran, was combined on the ISIGHT to complete the structural optimization work on the condition of restrain the stress and modal of the connecting rod, to explore the application of the MDO design method in the diesel engine connecting rod structure optimization field, offer a reference for the further improvement design study.
Particle Swarm Optimization Based Algorithm for Ship Vertical Passage Layout Optimization
Authors: Wang Wen Quan , Huang Sheng , Hu Yu Long , Hou Yuan Hang
Published: February 2012

The passage plays a vital role in operation and maintenance of naval ships. The rational design of the passage could increase the efficiency of combat logistics, life-cycle logistics and personnel movement under combat and emergency conditions. Borrowing ideas from facility layout, the model of optimal vertical passage layout was established to formulation the vertical passage layout problem. The Floyd’s algorithm was used to calculate the distance between two compartments and the particle swarm optimization algorithm was proposed to solve the mathematical model. From simulation results, the model and methods are feasible for the vertical passage layout problem.
The Nonlinear Finite Element Analysis and Optimum Design to the Thread Joint of 30 in. Marine Riser
Authors: Ye Jin Duo , Xi Yu Ting , Tan Shu Ying , Li Shu Tao , Li Zhe
Published: February 2012

Abstract: Both the method of engineering and nonlinear finite element method have been used to the analysis and optimum design of the 30 in. marine riser with the screw thread. Two load steps have been used in the finite element analysis including the processes of both assembling and applying the load of piling, and the nonlinear contact between marine risers has been considered in the simulation. Numerical results show that the stress in the marine riser increase rapidly when the magnitude of interference of the screw thread change slightly. By the way to change interferential magnitude of the screw thread, the maximum stress of Von Mises decrease from 681MPa to 381MPa and contact stress decrease from 238MPa to 122MPa. The engineering practice over 100 piles in offshore platform has shown that the numerical results are good.
Improve Manufacturing Execution & Cycle Time through Database LEAN Optimization
Authors: Xiong Fei , Yao Jin , Li Jing Min
Published: February 2012

Today, all the companies around the world are looking for the best methods and ways to store and ensure the protection of their business information. Semiconductor Manufacturing Industry has huge and quite important daily operation data to store and backup yearly. As we know the storage capabilities increases, this is clear evidence that we are handling more information every day, for this reason is critical that our process to archiving and searching the information needs to be improve it. In this paper that demonstrates the effectiveness of the database script optimization & Lean strategy. Simple changes big impact, waste elimination, improves manufacturing execution and cycle time.
Conditional Simulation of No-Gaussian Stochastic Process Based on Neural Networks
Authors: Li Jin Hua , Chen Shui Sheng , Sheng Wei Bing
Published: February 2012

In many fields such as wind engineering, ocean engineering, soil engineering and so on, it is obvious that the development of effective methods to generate sample functions of non-Gaussian stochastic processes and fields is of paramount significance for many systems subjected to non-Gaussian excitations. In this paper, neural network technique is proposed for the conditional simulation of non-Gaussian stochastic processes and fields. In machine learning of neural network, interpolation is employed to train finite non-Gaussian samples. As numerical examples, the conditional simulation of non-Gaussian fluctuating wind pressures is carried out through using back propagation neural network and generalized regression neural network respectively.
Study on Energy Saving Coatings with Phase Change Material
Authors: Yang Bao Ping , Li Yan Hua , Cui Jin Feng , Guo Jun Hong , Zhou Ying Ping
Published: February 2012

Microcapsule phase change materials were synthesized by using melamine-urea resin as shell, lauryl alcohol and butyl stearate as core. The energy saving coating was prepared by blending the microcapsules in them. The morphology of microcapsule was checked by SEM. The heat storage capacities of different coatings were detected by Differential Scanning Calorimeter (DSC). The results showed that the latent heat of microcapsule is about 202.6J/g with good heat accumulation effect, the heat storage capacity of the coating is the greatest when the film material is acrylic resin.
Research on Battery Management in Multi-Power Grid Generation System
Authors: Wang Chun , Fang Zu Hua , Hong Ting Ting , Sun Ying , Xu Hong Bing , Han Pei Ying
Published: February 2012

The multi-power grid generation system will be the main technology in the future use of energy. It can provide high quality uninterruptible power supply for users through the grid-connected system of photovoltaic system, wind power, batteries, and gas-fired power and other clean energy source. Due to the instability of energy source system and the special conditions of the energy storage system, an important factor of affecting the multi-power grid generation system is the energy storage system. So, this paper aims to design an optimized battery management system (BMS). It not only can take advantage of solar, wind, gas and other clean energy source but also have an efficient management and maintenance system to batteries, which can reduce the costs of battery maintenance, and improve the battery packs' efficiency. This design has outstanding advantages over low-medium power applications.
Fatigue Life Reliability Analysis of Submarine Cone-Cylinder Shell
Authors: Zhang Zhi Yong , Song Tian Shu , He Yang
Published: February 2012

A new method is presented in the paper. The fatigue life reliability of submarine cone-cylinder shell is investigated, based on the combination between the methods of conventional Monte Carlo and classical probabilistic fracture mechanics. Firstly, Monte Carlo method is employed to obtain the reliability of given initial fatigue life. Secondly, the two induced factors M1 and M2 in the paper are estimated according to the initial fatigue life and the reliability. Thirdly, based on the two factors, the other fatigue life reliability is obtained by using classical probabilistic fracture mechanics method. Finally, numerical cases show that the proposed method is more efficient without accuracy loss for fatigue life reliability compared with Monte Carlo method. This method can also be applied to predict the fatigue life reliability of analogue structures.
Cause Analysis of Round Thread Connection Dropout
Authors: Pan Zhi Yong , Song Sheng Yin , Liu Wen Hong , Han Xin Li , Han Jun , Zhang Dan
Published: February 2012

Dropout may be happen to round thread connection by main reasons of design and process of product, material’s property, make-up torque or make-up position, field operation problems etc.. Casing’s property has get a high improvement with the development over the past decade in China. But the number of connection dropout accident didn’t declined obviously. These lead to great economy loss and safety hazard had taken place. Research on a round thread connection pullout case was carried out combining relative theorys with tests. Macroscopic analysis and dimension measurement and material’s physical and chemical properties were checked for casings and couplings. Thread inspection and full-scale tests were done for casing simples that are same lot with dropout. Comprehensive analysis was carried out on these results. The results showed that dropout failure was ascribe to two main causes. One is make-up location cann’t reach standard location at field end, and the other is incorrect holding position on coupling in the course of making up.
Ontology Design of Airport Special Vehicle Training Simulator
Authors: You Lu , Liu Xiao Li , Li Jian Li , Shi Xu Dong
Published: February 2012

An Airport special vehicle training simulator which simulates B737 and B747 is introduced in this paper. The ontology design of Airport special vehicle training simulator included the design of analog cabin, retractable mechanism of lateral, homemade chassis, security support and so on. Airport special vehicle simulation cabin is part of the direct docking. Door height and door dimensions refer to the actual size and curvature of the real aircraft. During the operations of the Special vehicles at the airport, docking between the vehicles and the airplanes can be achieved with the aircraft simulator. The Airport special vehicle training simulator can meet operational requirements of Airport special vehicle and is facilitated to improve operation level of drivers and reduce the cost of training operations.
Analysis of Fatigue Reliability and Fatigue Life for a High Voltage Valve
Authors: Bo Ji Kang
Published: February 2012

The high voltage valve bears repeated loads and impact in its working state. Fatigue failure or fatigue damage is the most common failure mode of high voltage valves. This work analyzes the working principle and working characteristics of a high voltage valve under a static rated load, and proposes the necessity of the fatigue analysis. The failure probability of the high voltage valve is presented and the service life of the entire valve obtained. To find the part prone to fail, the evaluation of the fatigue life of the high voltage valve is carried out. The fatigue life and safety factor of the high voltage valve is obtained. It is found that the edge joints are easy to fatigue failure, which provides a reference for the actual application and of maintenance the high voltage valve.
Fingerprint Identification System Based on Two-Dimensional Barcode and DSP
Authors: Wang Yuan , Liu Li , Song Qian , Bao Ya Ping
Published: February 2012

Aiming at low portability and undue dependence on the SSD database of most of authentication system, a fingerprint identification system based on a two-dimensional bar code and DSP was proposed. The central processor TMS320VC5416 was used, and the fingerprint information obtained from PDF417 barcode by the barcode reading device was fuzzy matched with that by online real-time collection. The quick verification of the card holder’s identity was realized.
Structure Improvement and Fatigue Analysis of Single-Girder Crane Main-Beam
Authors: Zhou Chao , Wan Jin Zhen , Chen Xu , Shuai Fei
Published: February 2012

The paper proposes three kinds of improved main-beam structural style of electric single-girder crane and established FEA model for each style. The stress values of stress concentration points of improved structures have been compared to traditional structure. The fatigue strength of points where easily occur fatigue failure have been analyzed using local structure stress method and Master S-N curve. According to fatigue analysis, the minimum number of effective cycles is N=3.73×105, which can meet the design specifications well. This study will provide some ideas for main-beam design and improvements.
Stress Spectrum Analysis of Random Vibration of Vehicle Frame Based on Virtual Excitation Method
Authors: Jiang Hong Qi , Li Shun Cai
Published: February 2012

To determine the stress spectra of a vehicle frame under random road excitations, A mathematical model was been established using the Euler-Bernoulli beam elements and spring-damper elements for the multiple-degree-of-freedom (MDOF) vibration of the vehicle frame with a finite element method, and adopted a virtual excitation method to construct virtual road excitations based on four points, i.e., front and rear wheels, thus we offered a method for calculating the statistical characteristic of the random vibration response of the vehicle frame based on the virtual excitation method, and realized stress spectrum analysis of the random vibration of the vehicle frame. The results show that combining the virtual excitation method and the finite element method for random vibration analysis, maintained the theoretical precision and greatly simplified the calculation , thus provided a feasible way for stress spectrum calculation in fatigue analysis of a vehicle frame under random excitations.