bluuebunny/crossref_metadata_2025 huggingface dataset:
A Novel Internal Model Control Method for Non-Square System
Authors: Quan Ling , Zhang Hai Long , Yang Yang
Published: November 2012

Multivariable non-square systems with time delays widely exist in the chemical production process. Owing to the matrix that is adopted to describe non-square system is not square, many classical multivariable control methods can be hardly applied in such system. In this paper, based on non-square effective relative gain (NERGA), a novel internal model control method is proposed. Firstly the input and output loops of the non-square system are paired using NERGA, and then V-norm internal model controller is designed based on the model of squared subsystem. Finally, smulation study is carried out for a non-square system. The results can demonstrate the effectiveness of the proposed method.
Experimental Studies on High Strength Concrete Beams Reinforced with Steel and GFRP Rebars
Authors: Liu Ying Hao , Yuan Yong
Published: November 2012

The paper analyzes the structural behavior of high strength concrete (HSC) beams reinforced with hybrid glass fiber reinforced polymer (GFRP) and steel reinforcements. The analysis refers to HSC beams reinforced with GFRP rebars and steel rebars placed in different layers. Results of the experimental and theoretical investigation are represented and discussed. Significant features of the structural behavior regarding flexural strength, deflection, are pointed out.
Bridge Structure Performance Evaluation Based on Dynamic Load Test
Authors: Zeng Yan
Published: November 2012

Static load test was carried out on Hengshui interchange ramp bridge of Lin-Chang expressway. The superstructure of the bridge is cast-in-place prestressed concrete continuous box-girder. The actual service state of the bridge is analyzed by the comparison of experimental and calculation results. The study provides the initial technical files and the basis of acceptance, operation, maintenance and management for the bridge.
Study on Construction Process of Suspension Bridge Based on a Co-Rotational Framework
Authors: Wang Bing Jian , Song Jian Yong , Lu Jian Ming
Published: November 2012

Based on a co-rational (CR) framework, a 2-noded element formulation of 3D truss was presented, which was used for accurately modeling of suspension bridges with large displacements and rotations. The CR framework could consider the out-plane stiffness by the geometric stiffness, which was applicable to the analysis of 3D cable bridges. Using the co-rational truss united with the energy convergence criteria and the Newton with Line Search Algorithm, the nonlinear behavior of 3D cable structural system was simulated conveniently and accurately. Therefore, the traditional truss elements based on elastic modulus modified method and complex catenary elements were avoided. In order to simulate the hanging of girder and the structural system changing during the construction, the elements’ killing and activating methods were realized by the modulus modified methods.
Design of Mitigation Damper with Support Flexibility for Stay Cable under Bridge Deck Excitation
Authors: Luo Shuai , Yan Quan Sheng , Liu Hong Jun
Published: November 2012

This paper studies cable-damper mitigation model due to indirect excitation caused by bridge deck excitation. In the new mitigation model, as a rule of thumb, we considered an attached spring associated in tandem with a damper to simulate the supporter flexibility. The result shows that the interaction between the flexibility of the support in the viscous damper could deeply impact the damper effectiveness, and the external damping should be increased deeply to provide the same non-dimensional modal damping when the inclined angle of cable decreases. The optimum damping coefficient of the non-idealized damper increases when the flexibility of the supporter increases.
Dynamic Analysis of Bridge-Approach Embankment Transition Segment
Authors: Li Zhen Xia , Chen Yuan Zhao
Published: November 2012

Dynamic responses of coupled system were analyzed when the speed of train was 350km/h and the transition was filled with graded broken stones mixed 5% cement. Results indicate that setting form of bridge-approach embankment section has little effect on dynamic responses, thus designers can choose it on account of practical circumstances. Based on the study from vehicle-track dynamics, we suggest that the coefficient of subgrade reaction (K30) should be greater than 190MPa within 0-5m zone behind abutment and be greater than 150MPa in other zones.
Creep Effects on Simply Supported Prestressed Concrete Box Girder of High-Speed Railway with Ballastless Tracks
Authors: Fang Wang , Han Bing , Yang Shao Kun
Published: November 2012

Creep will lead to increasing deflection of prestressed concrete girder, which may induce rails uneven, especially to ballastless tracks in high-speed railways. In this paper, two creep models, CEB-FIP90 and ACI209, were used in a finite element model to analyze influences of creep on simply supported prestressed concrete box girders which are used in high-speed railway in China. Sensitivity analysis was carried on towards curing age, secondary dead load, loading time and prestressing method on deformation of the girder. The results show creep should be controlled in engineering to ensure driving security.
Static Analysis of Reinforced Concrete Arch-Deck Bridge with Archaized Connective Corridors
Authors: Li Xiao Ke , Liu Li Xin , Liu Shi Ming , Zhao Shun Bo
Published: November 2012

As the requirements of traffic functions and urban landscape, a reinforced concrete arch- deck bridge is designed with archaized connective corridors. The main dimensions and drawings are introduced and the static analytical results of the bridge are discussed in this paper. The numerical model was built by the integrated solution system for bridge and civil engineering- MIDAS/Civil. The results show that the temperature of bridge and the horizontal shift at arch toes due to sedimentation play important roles sensitively influencing the bending moments and displacements of control sections. Compared numerical results of the bridge only with dead loads, the maximum bending moments and displacements would reach 3.81 times and 6.52 times respectively. The axial force of arch is mainly resulted from dead loads, which gradually increases from arch crown to arch toes. The design and numerical results would give some references to similar bridges.
The Research of Steel Bracket Jacking Experiment in Long Span Continuous Beam Bridge
Authors: Zhou Chen , Yan Quan Sheng , Zheng Heng Bin , Wei Guo
Published: November 2012

Bridge jacking technique in the old bridge reconstruction project have broad application prospect, this paper is aim to share the bridge jacking technique and design the steel bracket as the load carrying platform. The finite element calculation is conducted by ANSYS software considering the concrete material nonlinearity with reasonable stress-strain relationship of concrete and element type. Compared with the experimental data, the model reliabilities and the results of two test programs are evaluated. We can conclude that the second structure form of this paper is safer, which can provide the meaningful guidance for similar projects.
Plastic Hinge Analysis of Seismic Performance of High Bridge Pier
Authors: Gao Rui Hong , Chen Rui Lin , Cao Su Gong , Tang Zhang , Xiao Xin Qiang , Hu Hong Bo
Published: November 2012

To analyze the second plastic hinge of high bridge pier formed in the earthquake and study the pier seismic performance, this paper takes the Kunming Slope Railway Bridge as an example. The simulation model was built by the elastic-plastic finite element ANSYS software. The buckling load of piers was calculated by buckling analysis capabilities of ANSYS software, a small enough initial offset given to the model, then the buckling load of piers put into the model. The deformation of non-linear model under the loads was calculated, the process was recorded that the reinforced concrete bridge piers initially yielding on the cross-section, continuously rotating around the neutral axis, and finally forming the eventually plastic hinges in certain parts of pier. The location of the plastic hinges can be inferred by final data of analysis software. By analyzing the calculated results, the seismic performance of the second plastic hinge in high bridge is studied.
Analysis of Plastic-Zone Radius Influenced by Mechanical Parameters in Tunnel Excavation and Support
Authors: Su Zhong Ming , Liu Rui
Published: November 2012

According to the elastic-plastic theory, the analytical formula of plastic zone radius is established for circular tunnel in its excavation and support, and the effect of anchor support is verified based on the radius of plastic zone from the perspective of measured axial force. The influences to plastic zone by the variations of mechanical parameters and resistance of support are quantitatively analyzed. The result is of great significance to the monitoring measurement and the dynamic design and construction of tunnel.
Introduction of NO-NO2-O3 Recycle into Model for Air Pollutant Dispersion from Tunnel Portals
Authors: Miao Shu Jiang , Fu Da Fang
Published: November 2012

NO-NO2-O3 recycle has been added into model dealing with air pollutant dispersion from tunnel portals-GRAL35TM to improve its performance. A mixed method GRAL-C has been discussed. It has been integrated into GRAL35TM to model dispersion in the street canyon where Tongjimen tunnel northern portal locates. It has been illustrated that GRAL35TM+C simulated NO2 dispersion more precisely than the original GRAL35TM. It requires background O3 concentrations.
Underground Space Form Design of Large Centrifugal Shaker System and Analysis of Machine Foundation Vibration
Authors: Wang Yong Zhi , Wang Yun Long , Chen Zhuo Shi , Yuan Xiao Ming
Published: November 2012

Centrifugal shakers are accounted the most effective and the most advanced test method of geotechnical earthquake engineering and soil dynamics, for a unique ability of exerting dynamic loads of sine waves and seismic waves on models while the same gravity stress as prototype is produced. Large centrifugal shakers are necessary to countries of frequent earthquake occurrences, but no one has been built in China. As state-of-the-art test equipments, its construction absolutely has many challenges. In the machine foundation design, its underground space employed a narrow rectangle as usual can’t satisfy the required space of facilities, while the imbalance force of equipments against foundation stability is inherently high. For no relevant research findings can be available, the paper states the general layout of a large centrifugal shaker and the fiendish problems between two space forms. By theories of mass-spring-damper and elastic half-space, two foundation vibration mathematical models for large centrifugal shakers are proposed. The calculation results of both underground space forms show that a round space meeting the required space of facilities doesn’t significantly increase foundation vibration, and is more ideal. Moreover the view of a narrow rectangular underground space more stable to large centrifugal shakers by experience is not true.
Analysis of Settlement Reasons and Mechanism in Immersed Tunnel
Authors: Wei Gang , Qiu Hui Jie , Wei Xin Jiang
Published: November 2012

The settlement of immersed tube tunnel may be influenced by variety factors in construction, operation and loads. The factors causing the immersed tube tunnel settlement were summarized and described in-depth by cases and data. Combined the mechanism analysis with the construction process, the action time of different loads along the construction process is summarized, the consolidation characteristics and settlement mechanism of original state soil layer and base layer are analyzed. The mechanisms and variations of tidal loading, siltation and dredging disturbance, groundwater level drawdown are elaborated.
Controlling Criterion for Differential Settlement of Widened Expressway
Authors: Xing Hao Feng , Li Hao Ming
Published: November 2012

The controlling criterion for differential settlement between the new and old subgrade of widened expressway is an important technical problem concerned by academia and engineering field. Based on an engineering project, finite element method was used to analyze the effects of foundation, embankment and road surface on the differential settlement, in which the foundation, embankment and pavement was considered as a whole structure, and the ultimate tensile strength was used to determine its strength. The calculation duration is from the construction of the original road to the post construction settlement of the widened road. The controlling criterion of differential settlement after bilateral widened expressway was explored. The analysis results show that the maximum differential settlement should be controlled in 5cm considering the mechanical response of pavement structure, and the integral analysis method is more reasonable to analyze the differential settlement of widened subgrade.
Correlation of Site Characteristic Period with Predominant Period of Ground Acceleration by a Simplified Model
Authors: Chen Long Wei , Wang Wei Ming , Sun Rui
Published: November 2012

Site characteristic period is an important index in seismic zonantion and seismic resistance design. The characteristics of the ground motions are conceptually related with site characteristics. A simplified single-layer model is used for simulating horizontal strata under seismic loading to calibrate the correlation of site characteristic period with the predominant period of ground motion. The analytical results show that the inputted motions were amplified considerably by the site typically for the period components which were close to the site characteristic periods; with the shear wave velocity of the soil layer decreases with respect to the initial shear wave velocity, the predominant period of ground motion increases; the site characteristic periods are consistent with the predominant periods of the ground motion.
Study on Anti-Seismic Reliability of Urban Water Supply System
Authors: Li Xiao Juan , Shen Fei Min
Published: November 2012

According to the seismic damage mechanism of the buried pipeline，the seismic performance of single pipeline is evaluated quantitatively. The network connectivity is analyzed with Monte-Carlo method and seismic performance of the whole network system is evaluated quantitatively. Finally, the anti-seismic reliability of the main water supply system is analyzed in the City of Fuzhou. The results indicate that the proposed method is feasible, accurate and effective, which provides references for further research of design, optimization and reformation of the urban buried pipeline.
Research on Comprehensive Utilization of the Tail Ore
Authors: Chen Ying Jie , Li Gen
Published: November 2012

A lot of tailings have been accumulated in China, which brought severe environmental pollution and took up the massive land, and even threatened the life safety of the people. By the experimental study, it is found that in the north area of China, the tail ore is easy to be grinded and burned， and may be used as the sand with good particle gradation. The ignition loss quantity of the tail ore and the compressive strength of concrete with different proportion of the tail ore are studied. It offers a new way for the comprehensive use of tail ore.
A Study on the Analysis Method of Soil Layer Seismic Response in Seasonal Frozen Site
Authors: Chen Zhuo Shi , Meng Shang Jiu , Li Yu Run , Chen Long Wei
Published: November 2012

The analysis of ground motion on seasonal frozen soil mainly focused on the conventional soil, neglecting the impact of the permafrost which causes the obvious defeats in the existed calculation procedure. In this paper, the author proposed that we should apply the field test of shear wave velocity to the soil layer response calculation, improve the test method of dynamic shear modulus, and adopt the regular analysis method of soil layer response to the calculation of frozen soil site.
Introduction to ASCE7 Seismic Design and the Comparison with Chinese Code GB 50011-2010
Authors: Song Can , Zheng Hui Jun
Published: November 2012

Nowadays the design becomes more and more international. In order to effectively meet this trend, it is necessary to understand the similar or different concept and application of American code and Chinese code on seismic design. This article introduces the concept and design procedure of ASCE7 and compares the seismic analysis results of ASCE7 and GB 50011-2010 through a project example. The similarities and differences of American code and Chinese code on seismic design are summarized.
Experimental Study on Mechanical Behavior of Concrete Loading along Path (Constant Stress, Constant Strain, Increasing Strain)
Authors: Wang Zhe , Li Jing , Shang Ren Jie
Published: November 2012

Triaxial compressive experiments were performed with normal concrete by using the large triaxial test system. The loading process was divided into two stages: (1) Under the condition of keeping the three axial stresses equivalent, the compressive stress was increased to a specified value p, which was maintained for a period of time; (2) The strain in y direction was increased monotonously while the stress in x direction and the strain in z direction both remained constant. In this paper, the study on the experiments indicates: the minimum principal stress significantly influences the strength of concrete, i.e., the greater the minimum principal stress is, the greater the concrete strength is; the stress in y direction where the strain stayed constant is the middle principal stress; the constant strain influences the relationship between σ2 and σ1, they reach the peak values at the same time and approximate to linear relationships in much parts of their descending stage, curvature only appears at their ends; When ε13>8, each relationship curve of τ13-γ13 gradually becomes horizontal；Below a line AB in figure of coordinate system εx, εy the curves of εx-εy approximately parallel to each other; If the minimum principal stress is 15MPa or 20MPa, After εkk reaches the peak point, the volume gradually becomes stable after a transient decrease stage.
Simulational Study on Biaxial Tensile Test of the Envelope Material of Stratospheric Airship
Authors: Zhang Yan Bo , Lv Ming Yun , Gu Shou Chao , Meng Jun Hui
Published: November 2012

Tear propagation is the typical fracture mode of fabric laminates, which is affected by stress and damage shape (size). In this paper, envelope material which is mainly composed of fabric laminates used in stratospheric airship is the objective of the study. The tear propagation and tear strength of Cross-shaped specimens with initial damage which were in different situations (size, angle and shape) were studied through biaxial tensile test which was conducted in a tailor-made testing machine, and the strength is noted simultaneously to gain the mechanical properties of the specimens. A finite element model was also built in ABAQUS, simulating the biaxial tensile condition, and the simulation results were compared with the test results and observed to have good agreement between them.
Research on the Relationship between the Impact Explosive Temperature and Mass Ratio of PTFE/Al Reactive Material
Authors: Li Shun Ping , Feng Shun Shan , Dong Yong Xiang , Chen Yun
Published: November 2012

The impact explosive temperature of reactive material is not only an important indicator to measure the ability of explosive reaction, but also a required parameter to carry out thermo-chemical calculation. So there is important practical significance to study the impact explosive temperature effect of reactive material. Based on one-dimensional shock wave, thermodynamics and physical chemistry theory, mathematical analysis model of impact explosive temperature vs. mass ratio of the reactive material is established. By MATLAB programming, the curve of impact explosive temperature vs. the mass ratio of PTFE/Al reactive material is received, which can be used to analyze variations. Fitting function equations is obtained by MATLAB CFTOOL. At last, the contrast of original calculation curve with fitting curve validates the appropriateness of the fitting function equations. From the view of impact explosive temperature effect, we suggest that the established model and research method can be applied to the dynamic properties research of other reactive material.
The Research of Personalized Glasses Custom Design System
Authors: Chen Yao
Published: November 2012

Abstract. There is a large population in our country. Owing to nearly 300 million people dress glasses, there is a huge market of glasses. China isn’t a glasses design great power although China is a glasses manufacture power. Domestic glasses design ability is not strong, and the product in the domestic market is homogeneity serious. In order to meet the diversified needs of the people, the personalized glasses custom design system has operated preliminarily. The personalized glasses custom design system lets designer to design a glasses in accordance with the customer’s desire through the consumer communicates with designers. The tailor-made glasses can fulfill all most consumer demand. The system can satisfy all of demand of the consumer through filling in the consent form, drawing sketches and renderings, and making the glasses samples.
Summary of Application of Chinese Copper-Clad Aluminum Wire
Authors: Liu Chang Ming
Published: November 2012

From the origin of the copper clad aluminum wire, Discussed copper clad aluminum wire structure, performance, and an overview of the preparation process of the copper clad aluminum wire, Analysis copper clad aluminum wire applications and problem in applications, and finally summed up: As long as we solve good copper clad aluminum recycling, and to formulate product standards for copper clad aluminum wire, copper clad aluminum wire can become save a lot of copper resources, reduce raw material costs, and to promote the cable industry is continuing the development and creation of resource-saving society in China new type of conductor material.
Synthesis of Bauxite Based β-SiAlON by Compound Reduction Nitridation
Authors: Guo Yan Qin , Li Hong Xia
Published: November 2012

The process of synthesizing bauxite based β-SiAlON by using carbon silicon composite reducing agent was studied. Specimens prepared by mixing bauxite (Al2O3 68%), carbon black and silicon are nitrided at 1100~1550°C for 6h. The mass change ratio of the specimens are determined; Phase composition and microstructure of some specimens are examined by XRD, SEM and EDS. The results are compared with those of specimens using Si and C separately as reducing agent. It is found that at 1100~1200°C only Si reacts with N2 and SiO2 to form Si2N2O; At 1300~1400°C, C takes part in reduction-nitridation with subsequent formation of SiAlON; At 1450~1550°C, there is noticeable increase in β-SiAlON formation, the optimum temperature is 1500°C. The amount of β-SiAlON formed is higher and crystale growth is better than that of single reducing agent.
Study on Corrosion Behavior of Various Steels Used by Ocean Wave Energy Equipment
Authors: Wang Yan Gang , Tong Xing Hua , Jiang Yong , Liu Yong , Zhu Lin Sen
Published: November 2012

The corrosion characteristics of various steels used by ocean wave energy equipment in sea water are investigated by electrochemical tests in this paper. The electrochemical experiments are carried out to research the corrosion rules of Q235, 20# steel, 16Mn and X42 through contrast experiments. Polarization curves and electrochemical impedance spectroscopy (EIS) are got by electrochemical workstation. Corrosion rates and corrosion potentials are analyzed from the polarization curves, and corrosion rules are founded. In addition, EIS is analyzed, and the analysis results are consistent with the results of polarization curves.
Finite Element Simulation on Micro-Forging Process Inhibiting Warping of the Thin-Walled Components Treated by Laser Cladding
Authors: Zhou Ju , Qiu Chang Jun , Cheng Xi Yang
Published: November 2012

During the process of laser cladding thin-walled components, warping deformation generated on the thin-walled components due to the difference between the change of temperature field and thermal expansion coefficient of materials. Through the micro-forging regulation, the internal stress of laser cladding layers changed, reaching the purpose of suppressing the warping plastic deformation generating on the thin-walled components. This paper utilized Ansys software to calculate the temperature field and stress field of the process of laser cladding 304 stainless steel regulated by micro-forging, and compared to the measurement result of the warp deflection and stress. The results indicated that reasonable effective micro-forging can effectively restrain the warp occurring on the thin-walled components treated by laser cladding.
Dynamical Identification Model of Laser Cladding Height in Metal Parts Laser Shaping Process
Authors: Jiang Shu Juan , He Ai Zhong
Published: November 2012

The metal parts laser shaping process dynamical identification is fulfilled by the method of experiment. Through step response experiments, mathematical models between the cladding height and the laser power, the scanning speed, or the powder flowrate are established respectively. Simulating experiments validate these identification models. From the identification models, the metal parts laser shaping process is understood, which is the basement for designing closed loop control in forming process and is significant to improve the quality of formed parts.
Tribological Properties and Worn Surface Analysis Generated by Sulfur- and Phosphorus-Free Molybdenum-Containing Water-Based Lubricant
Authors: Yan Li Li , Wang Cheng Biao , Yue Wen , Xu Bo
Published: November 2012

The development of environment-friendly water-based lubricants has been paid more and more attention in modern manufacturing due to environmental concern and human health. In this paper, several water-soluble molybdenum-containing additives (WMCAs) were synthesized, and characterized by Fourier transform infrared (FTIR), scanning electron microscopy (SEM), and X-ray photoelectron spectroscopy (XPS). The tribological properties of WMCAs in water were evaluated by a four-ball tester. The results indicated that WMCAs exhibited beneficial effect on the anti-wear and friction-reducing properties of water under all tested concentrations, which could be attributed to organic nitrogen compound, iron oxides and MoO3 in WMCAs tribofilm.
Glass Fiber Functional Warp Sizing
Authors: Mao Liang , Dai Hai Ling , Fang Xin , Guo La Mei
Published: November 2012

The sizing agent is made by polypropylene powder in blending method and then sizing the warp with it. The result of its sizing performance shows that the sizing capacity of the newly made sizing agent could meet the requirement of waving property compared with the traditional sizing agent. The composite material is made by Glass fiber texturized yarn cloth as reinforce materials after the weaving is completed. And, subsequently, test the properties of the composite material. Result shows that the properties of the composite material which is processed by polypropylene powder slurry have been improved, compared with the composite material processed by traditional slurry. The use of new slurry can remove the calcine process. Therefore, it will save energy and reduce the pollution.
Research on Creep Characteristics of the Double-Base Solid Propellant
Authors: Zhang Jian Bin , Ju Yu Tao , Zhou Chang Sheng
Published: November 2012

The uniaxial tensile creep tests of the double-base solid propellant specimens were carried out at 450C under five different stress levels. The viscoelastic models such as three parameters solid model, Burgers model, generalized Kelvin model, five parameters solid model and exponential model were adopted. The computation equation that can describe the strain rate of the second creep stages of the double-base solid propellant under different applied stress levels was founded on the basis of these creep tests, and the adaptability of the five models on creep characteristics of the double-base solid propellant were studied. The study results shows that the five models can show good agreement with second creep course of propellant under different applied stress levels, but the generalized Kelvin model may have optimal characterize creep curve of the double-base solid propellant.
Study of Oxidation Behavior of Zn and Fe Nanoparticles
Authors: Wang Min
Published: November 2012

Zn and Fe nanoparticles prepared by the arc was used in the present study. It were oxidized by laying in the air The microsturctures, oxygen content and oxygen atoms position in nanoparticles were investigated. The results showed that the effective size of oxidized nanoparticles was about50-100nm, particles with a complete form, Particle radius and dislocation density of Oxidated Zn nanoparticles have not change much compare with Zn nanoparticles.Only the strain increase. Fe nanoparticles oxidation lead particles strain rising sharply, and the dislocation densities have decreased slightly. the oxidation occurs in the surface of Fe nano-particles, and generated Fe2O3, After Zn nanoparticles oxidized,Formed ZnO Particles on the surface.
Friction Structure Effect Analysis of Granular Materials in Foundation Soil
Authors: Wang Chang Dan , Zhou Shun Hua , Su Hui
Published: November 2012

To research and analyze the additional stress distribution and change of granular materials, the model tests are used to observe vertical additional stress in different position and depth. And the comparison between observed values and theoretical values is conducted to analyze the transmission and attenuation of additional stress in granular materials. The research results show that calculated values are based on Boussinesq solution which ignores the property of soil layer (materials), the distribution of additional stress for fine sand which belongs to granular materials is largely deviated from theoretical value. For granular materials, inner friction structure effect is evident influence to additional stress transfer. And continue using calculation method which is based on continuum materials will have bigger difference and even wrong.
Failure Analysis of Stress Corrosion Crack of 1Cr18Ni9 Stainless Steel Cylinder Body
Authors: Wei De Qiang , Dong Xin , Li Shan Qiu
Published: November 2012

As a kind of corrosion resistant material, stainless steel is widely used in petroleum, chemical, pharmaceutical. Stress corrosion cracking is a main reason that why the stainless steel became disabled. Therefore, it is very necessary to research and study the stress corrosion cracking of stainless steel .The failure analysis to the sample is conducted aiming at the stress corrosion of the stainless steel piston cylinder in a factory. The analysis includes macro analysis, metallographic observation, scanning electron microscopy analysis and XRD analysis. The results of the study show that it is nonmetallic inclusion on the grain boundary, the chloridion in the industrial circulating water and the rough columnar austenitic grains in the organization of the samples that lead to the stress corrosion cracking of the piston cylinder.
The Effect of Scanning Velocity on AISI 304 Stainless Steel Laser Cladding Coatings
Authors: Xu Peng , Lin Cheng Xin , Sun De Ping
Published: November 2012

Single and multi pass AISI 304 stainless layers tightly combined with substrate was obtained by laser cladding on the surface of 45 steel using the way of presetting powder. Effect of different scanning velocities on cladding layers was analyzed and interpreted in this paper; influence of scanning velocities on dilution rate was also acquired, the dilution rate come up to a maximum value which is 11.1% when the scanning velocity reached 800 mm/min, what is more, immersion test shows that scanning velocity has little effect on the weightlessness rate. Besides, XRD patterns shows that the cladding layers composed of ferrite and austenite phases.
Variant Design of Hydraulic Support
Authors: Shao Yuan Yuan , Zeng Qing Liang , Xuan Guan Tao , Liu Xian Xi
Published: November 2012

As is known to all, new mechanical product design is always on the basis of the original product, so to better use the exiting design resource, a mechanical product variant design method is presented. The new method is based on SML and parameter CAD. According to different geological conditions of coal mine, different types of hydraulic support are needed to design. So as a typical kind of mechanical product, hydraulic support is given as an example to demonstrate the new variant design method. Finally with SOLIDWORKS as a specific application object, integrated with SQLServer2000 database, a hydraulic support variant design system is realized by Visual Basic program, which shortens the cycle of mechanical product development and reduces duplication mechanical design greatly.
Effect of Thermal Treatment on the Physical Properties of Electrospun PVDF Membrane
Authors: Cheng Si Chen , Liang Yin Zheng , Qiu Yi Ping
Published: November 2012

The electrospinning technique was used to produce poly (vinylidene fluoride) (PVDF) membrane. Thermal treatment was introduced to improve the mechanical property and dimensional stability. In this paper, the PVDF membranes before and after thermal treatment were characterized by Scanning electron microscope (SEM), differential scanning calorimeter (DSC) and wide angle X-ray diffraction (WAXD), tensile testing. The crystallinity, tensile property, as well as melting temperature changed with the treated temperature. The results hows that thermal treatment could notably increase the tensile property of electrospun PVDF membrane and 160°C is a proper temperature for thermal treating
Laser Induced Forward Transfer
Authors: Kang Chun Lei , Xu Yan , Yung Kai Leung , Chen Wei
Published: November 2012

In this paper, we demonstrate using laser induced forward transfer (LIFT) technology to deposit Ti/Ni alloy on a glass substrate with high precision. Here the photonic feature of laser energy is used to move the Ti/Ni particles forward and deposit them on the glass, while the wave feature of laser is used to turn part of the Ti/Ni particles into ions. The characteristics of deposited films and their relations with the processing conditions are studied. A new method of depositing materials using photons instead of electrons in electric field may bring about a series of new technologies on surface deposition, which can be used to produce shape memory alloys.
Spectral-Domain Optical Coherence Tomography for Material Detection
Authors: Qin Yu Wei , Zhao Hong
Published: November 2012

Optical coherence tomography is a non-invasive cross-sectional imaging technology for inhomogeneous samples. Spectral-domain optical coherence tomography is introduced to measure film and Silicon dovetail groove in this paper. A novel method is used to deal with the interference spectrum to improve the quality of the two-dimensional cross-sectional image. The experimental result shows the microstructure of the two samples can be clearly seen as expected. From the visualized two-dimensional cross-sectional imaging, the film thickness and the dimension of the Silicon dovetail groove are obtained with this technique. It is experimentally demonstrated that this system is useful for imaging the microstructure of the internal and surface of film and semiconductor. It can be further developed for other material detection in industrial fields.
The Analysis of Fracture Mechanics on Self-Healing Composite Materials with Microcapsules
Authors: Zhang Li , Tian Ye , Ma Yan Miao
Published: November 2012

Fatigue failure of the mechanical parts has always been paid great attention to in mechanical engineering. In recent years the study on the self-healing composite materials with microcapsules provides a new way to solve it. In this paper, the fracture mechanics analysis on the self-healing composite material with microcapsules used for gear is carried out to determine whether it can achieve the self-healing. The results show that, only when the fracture toughness of the capsule shell and that of matrices matches in some way, can the self-healing be achieved. The composite material made of nylon 6 (PA6) as the matrix material, short E glass fiber as the reinforced material, poly ( urea-form aldehyde) encapsulated dicyclopentadiene (DCPD) as the self-healing microcapsule, is studied in this paper. The results show that this formula is feasible.
On the Three-Dimensional Relationship of Design, Consumption Psychology and Social Development in Green Packaging
Authors: Bi Dan
Published: November 2012

Green packaging is not only the consideration of technical level, and more important is the change of value. It requires conclude environmental protection function in the design of packaging function, but also embodies the integration of nature and human’s green thoughts, and the principle of environmental protection, renewable resources. It covers many aspects: care for ecological, environmental protection consciousness, human health and safety consciousness, the design thoughts of sustainable development, natural and comfortable, contracted design concept. Therefore it forms the special relationship of design, consumption psychology and social development in green packaging. The three aspects has their own characteristics in the green packaging, and produced a multiple relationship mutually, which presented interactive, unity, decisive, integration and so on the new relationship, we should pay attention to and handle these factors. It provides relevant basis to create a new, reasonable and better life style.
Adaptive Control of Magnetic Drive Actuator for Laser Cutting
Authors: Zhang Xiao You , Chu De Qiang , Shinshi Tadahiko , Fukuoka Teruaki , Nakai Takahiro
Published: November 2012

This paper describes an adaptive control method for a magnetic drive actuator that used for the laser cutting to realize high speed and high accuracy machining. Firstly, a zero bias current method and a nonlinear compensator are examined and used for the actuator. Secondly, an adative control method is presented. Finally, the coefficient of the gap-current-force is estimated and the effectiveness of the presented control method is verified by experiments. The experimental results show that the coefficient of the gap-current-force reduces exponentially depending on the increase in the length of the air gap. By using the adaptive control, the peak-to-peak vibration amplitude of the lens holder is reduced from 1.95um to 1.55um.
Receiver Operating Characteristic for Diagnosis of Wine Quality by Bayesian Network Classifiers
Authors: Wei Chih Chiang
Published: November 2012

This paper is dedicated to demonstrate the use of the receiver operating characteristic (ROC) and the area under the ROC curve (AUC) for diagnosing forecast skill. Several local search heuristic algorithms to discover which one performs better for learning a certain Bayesian networks (BN). Five heuristic search algorithms, including K2, Hill Climbing, Repeated Hill Climber, LAGD Hill Climbing, and TAN, were empirically evaluated and compared. This study tests BN models in a real-world case, the Vinho Verde wine taste preferences. An average AUC of 0.746 and 0.727 respectively in red wine and white wine were obtained by TAN algorithm. The results show that the use of TAN can effectively improve the AUC measures for predicting quality grade.
Design of a Servo Controller for Modularized Flexible Joint with Integrated Torque Sensors Based on SOPC
Authors: Wei Nan Zhe , Sun Han Xu , Ye Ping , Zhang Yan Heng , Ji Xue
Published: November 2012

In this paper, a design of modularized flexible joint servo controller on-chip for a space manipulator system is presented. First of all, the structure and sensor system of dual-joint is introduced. The structural optimization design of the joint torque sensor is carried out with the help of the ANSYS program for weight minimization. Next, the features of the hardware system for the dual-joint controller are described. All sensor information collection within the joints are obtained with FPGA hardware logic elements using System-on-a-Programmable-Chip technology, and the joint space trajectory planning and position control are realized by Nios II soft-core processor, which is embedded in FPGA. Finally, experimental results demonstrate the effectiveness of the compact joint servo controller for the space manipulator system.
A Novel Method for Alignment Calibration of IMU and Doppler Sensors
Authors: Li Wan Li , Lu Liang Qing
Published: November 2012

Mounting accuracy is of great importance to the performance of the Doppler-based navigation techniques. In this paper, a novel method for alignment calibration of IMU and Doppler sensors is presented. The presented scheme is based on the information from INS/GPS integration and Doppler. Different from previously reported techniques, not only the misalignments but also the scale factor error is considered in this study. By using a Kalman filter, the alignment matrix which is consisted of a misalignment matrix multiplying with a scale factor is estimated. The performance of the alignment estimates is evaluated with field experimental data over Yangzi River. Experimental results shown the estimates obtained by the proposed method perform much better than the existing solution. By using the proposed method, the accuracies of the transformed velocity and positioning are both increased.
RCS Control Study Based on the Model Reference Adaptive Control
Authors: Liu Fu Xiang , Wang Liu Min , Li Xuan
Published: November 2012

For the reusable launch vehicle(RLV), in the cruise stage without power and the initial load phase, due to the aerodynamic pressure is small, and the aerodynamic surface control efficiency is relatively low, it can not achieve the attitude adjustment of the RLV. This design is based on the continuous system, and applies to the model reference adaptive control law algorithms, to achieve the design of the reaction control system(RCS). According to the control torque which is required by the RLV attitude adjustment, the RCS distribution method of mixed-integer programming is used, and the control parameters of the reaction control system is adjusted in real time,thus to achieve the adjustment of the RLV's attitude. Through the software-digital simulation analysis, this method has a good controllability and robustness.At the same time, the stability of the model reference adaptive RCS is analyzed theoretically, and getting a certain amount of stability region.
Research of PMSM Rotor Absolute Position Detection System Based on AU6802N1
Authors: Bai Gong Ding , Gai Jiang Tao , Ma Tian
Published: November 2012

Permanent magnet synchronous motor (PMSM) has the advantages such as high power density, simple structure and easy to maintain in the field of hybrid vehicle drive, and has been widely used in many areas. PMSM control methods include Space Vector Pulse Width Modulation (SVPWM), Direct Torque Control (DTC) and Maximum Torque per Current (MTPA) and so on. In these control methods, speed and accuracy of PMSM rotor absolute position detection is the key of its perfect control. The rotor absolute position information is more accurate, the amplitude of its torque ripple will be lower, which means better performance of PMSM control. In this paper, a PMSM rotor absolute position detection system based on AU6802N1 has been designed and produced, and laid a solid foundation for its calibration and improvement.
Adaptive Inverse Control of Hydro Electric Unit Based on Wavelet Neural Networks
Authors: Liao Zhong , Ye Bin Yuan
Published: November 2012

Due to the nonlinear, time-variable and non-minimum phase character of hydro electric unit system integrated with water, motor and power, a new adaptive inverse control method of hydro electric unit based on the function approximation ability of the wavelet analysis and the learning characteristic of neural network is presented. The algorithm and formulas and method of adaptive inverse control is studied. It approximates the model and its inversion of hydro electric unit by wavelet neural networks(WNN), and then through constructing an aim function of broad sense, which is effective to the nonlinear non-minimum phase system. Theory and simulation to for hydro electric unit system demonstrate that the control strategy can more effective improve the dynamic and stationary performance than those based on neural networks. It gives a new approach in control for hydro electric unit system besides offer a beneficial reference to the control of non-minimum phase systems.
Research on Key Technologies of the Cableless Pipeline Robot
Authors: Duan Ying Ni , Han Zuo Jun , Li Guo Zhu , Tian Hao
Published: November 2012

The cableless pipeline inspection robot is a hot topic in current domestic and international oil and gas pipeline in the research of special robot. The functions of robot body for communication with the outside world, energy supply, mobile running gear, and flaw detection module are several key technologies in the pipeline robot in application. This paper presents the measures for those key problems: Fiber-optic conveys video images and data in the pipeline and robot bi-directional cableless communication with the host computer monitoring equipment is completed outside the pipeline; In the aspect of energy supply the transformer secondary coil is generated by Charging stations set up outside the pipeline and lithium batteries is recharged to complete function of robot self-propelled ; Mobile running gear is achieved through the use of the arm of the parallelogram unit peristalsis to walk forward;The flaw detection technology adopts both video acquisition and ultrasonic phased array imaging with dynamic focusing and deflection characteristics to improve flaw detection efficiency and detection identification.
Error Compensation for Single Pair-Pole Encoder Based on Ellipse Hypothesis
Authors: Zeng Yi Fan , Jiang Fang Fang
Published: November 2012

An error compensation method for the single pair-pole encoder has been discussed in this paper. This article analyzed offset, sensitivity error, quadrature error and ferromagnetic interference error of single-pole magnetic encoder to obtain the expression of each error. In order to facilitate error compensation, the common expression for describing the error has been summed up. The process for formatting the error can be assumed as the process of changing from circle to ellipse. Therefore the inverse of this process is the same as the process of error compensation. The experimental results show that the accuracy of magnetic encoder which used this method could reach ±1, thus the error compensation effect is obvious. The magnetic encoder which applied this method has the advantages of low-cost, high-precision and convenient to use.
The Optimization Layout Method of Intelligent Roadside Sensor System in Traffic Management and Control
Authors: Cui Dong Chu , Yu Yue
Published: November 2012

The vehicle sensor information and road side sensor information will be collaborative used in traffic management and control. In order to improve the comprehensiveness and economy of the traffic and road conditions’ information collection, we focus on the intelligent roadside system in this paper. Firstly, we analyse the functions of the intelligent roadside system. Through the analysis of the detection range, detection accuracy, price and applicable conditions of similar sensor, we delineate the selection range of the intelligent roadside sensor. Then we determine the layout scheme of the testing equipment sensors for different functions according to different types of network structure. Finally, we apply similarity analysis to optimize the configuration density to reduce system cost by selecting the sensor layout-intensive sections.