bluuebunny/crossref_metadata_2025 huggingface dataset:
Out-of-Plane Stability Analysis of U-Section Pin-End Steel Arch
Authors: Xi Kuan Tang , Li Jin , Zhou Tie Gang , Xu Qing Xing
Published: August 2013

Two kinds of finite element model which can reflect the effects of different loading positions were constructed with Beam 188 and Shell 181. Effects of different restraints, load models and rise-span ratios on out-of-plane buckling were studied by comparing results of fixed arches with that of pin-end arches under three loading models. It is conservative to design by employing results of radial loading. As for out-of-plane stability, pin-end arches are better than fixed arches when rise-span ratio is big. Compared with U-section pin-end circular arches with diaphragm, those with batten plates have batter out-of-plane stability, and they are more economical and easier to construct.
New Alternative Methods for Design of Joints and Elements of Timber Structures
Authors: Vavrusova Kristyna
Published: August 2013

The aim of this paper is demonstration of usage possibility of fully probabilistic methods for design and assess of timber structures elements due their expression of material properties with bounded histograms because timber in terms of one strength class shows broad range of strength properties.
48″900lb Full-Welded Ball Valve Ultimate Bearing Capacity Optimal Design
Authors: Mo Chun Li , Chen Yong
Published: August 2013

Fully-welded ball valve has been applied in large oil and gas pipelines, and its quality is directly related to the safety of the transportation of national energy. The wall thickness of 48900lb ball valve is greater than theoretical design thickness. In this article, FEM software was used to design ultimate bearing pressure by means of linear stress analysis method. By applying different inner pressure load, the stress distribution of the ball valve was studied. Stress verification lines were draw at stress maximum location and each stress item were checked under corresponding safe value. Optical design obtained maximum inner pressure can provide theoretical support for practical engineering application.
Research on the Joint of Concrete-Filled Steel Tubular Column and Steel Beam
Authors: Yin Ying Zi , Zhang Yan
Published: August 2013

With the pseudo-static test of 4 concrete-filled square steel tubular column and steel beam joint with outer stiffened ring, this paper discusses the failure characteristics, failure mechanism and seismic behavior of joints under different axial compression ratio. The analysis of the testing results shows: when reached the ultimate strength, the strength degradation and stiffness degradation of joints are slowly and the ductility is also good, the energy dissipation capacity of joints is much better.
Calculations of the Elastic Modulus and Internal Stresses of Orthogonal Symmetric Laminated Plates
Authors: Li Yan Ru , Jiang Hai Bo , Cheng Zhong Qing
Published: August 2013

The calculations of the elastic modulus and the internal stresses of the orthogonal symmetric laminated plates are very difficult, so experimental or numerical simulation methods were used generally. This paper proposed an Equivalent Strain Model, which can greatly simplify the derivation process of the analytical formulas. By the Equivalent Strain Model, the elastic modulus formula of two-layer plate was derived, and the formula shows that the elastic modulus of the laminated plate meets to the mixture rule of the cross-sectional area ratio of each its single-layer plate; Other formulas derived show that the stress within each single-layer plate is proportional to its elastic modulus and the external load stress, and is inversely proportional to the elastic modulus of the laminated plate. The formula of the average shear stress between two single-layer plates also was derived. Recursive method can be used for multilayer plate calculations.
Parameters Study of Steel Concentrically-Braced Frames Using IDA
Authors: Dong Zhi Qian , Li Gang , Li Hong Nan
Published: August 2013

Steel concentrically-braced frames (CBFs) as a lateral force resisting system are widely used in moderate seismic regions. The collapse capacity of CBF is uncertain in prior study so that an appropriate analysis method is hard to hunt. Incremental Dynamic Analysis (IDA) is an efficient method to evaluate the dynamic instability of structure. The IDA is incorporated in evaluation of collapse capacity of CBFs systems and IDA-based collapse ductility spectra of CBFs are concluded in this study. Variable periods range of CBFs systems considering reserve capacity are determined based on the IDA.
Analysis of Composite Timber-Concrete Ceiling Structure by Finite Element Method
Authors: Mikolášek David , Sucharda Oldrich , Brozovsky Jiri
Published: August 2013

This paper deals with a modeling of the composite timber-concrete ceiling structure. In the analysis of the composite structure, there is the slip using the contact elements and volume finite elements considered. Numerical modeling is complemented by an analytical calculation. This article aims to determine the stiffness of a particular type of glued strip. Totally eight models of the composite timber-concrete structure have been studied.
Development Status of Modern Bamboo Structure Building
Authors: Guo Jun , Tang Jing , Wen Yu , Zhang Jia Liang , Li Yu Shun
Published: August 2013

With the characteristics of fast growth and short renewable cycle, as well as the superiority in mechanical properties such as high strength and high stiffness, the application bamboo essence in construction industry will promote the green sustainable development of this industry. This paper introduces the structure and mechanical properties of bamboo briefly, with the composition, modeling features and special of composite bamboo buildings described and analyzed, and the current study examples presented, which provides ideas and references for future development of the modern bamboo structure buildings.
The Mechanical Behavior Analyses and Optimization on Large Wind Turbine Frustum Tower Structure
Authors: Gao Chun Yan , Gong Zhao Yu , Li Bin
Published: August 2013

At present, frustum tower is widely used in the large wind turbine on the international wind electric market, which is a typical high drumstick and dumbbell type high-rise structure, whose mechanical characteristics and design methods have some particularity. In this paper, using the finite element program SAP2000, the primary selection tower was carried on the static strength and stiffness analyses, some control indexes which affect the tower design were studied. Based on the FEM analysis results, combining with a great deal of model calculations, this kind of tower were optimized. Research results show that the material utilization rate of wind turbine tower is low, and that the top displacement and stiffness of the tower is the controlling factors of design. Based on the optimization results, a new tower with straight lower part and frustum upper part is proposed, which can increase stiffness of tower, improve the material utilization, and reduce the overall steel amount of tower.
Experimental Study on Mechanical Behavior of Wind Turbine Frustum Tower
Authors: Li Bin , Gao Chun Yan , Sun Hai Lei
Published: August 2013

One scale model of 1.5MW wind turbine frustum tower in Baiyun Obo was carried on pseudo-static test. The failure mechanism and characteristics, stress changes and distribution laws, hysteresis performance and ultimate bearing capacity were studied. Test results show that the wind turbine tower belong to the sudden extreme point instability failure; the buckling bearing capacity is as the ultimate bearing capacity of tower. The maximum stresses of tower mainly distribute at the variable wall thickness section and bottom, while other parts basically dont yield. This indicate that the material utilization of this kind of tower structure remains relatively low, structural design has yet to be improved, at the same time recommends that reasonable strengthen measures should be taken at the weakest part of tower. The P-Δ hysteretic curve of tower shows anti-"S" shape, the overall strength and stiffness degenerate more rapidly, which indicates that the plastic deformation and energy dissipation capacity of frustum tower is poor. The test conclusions could reflect the stress condition of prototype tower and provide references for design.
Finite Element Analysis of Reinforced Concrete Beam-Column Joint under Low Cyclic Loading with Different Load Systems
Authors: Ma Hua , Sun Xin Yu , Li Zhen Bao , Wang Wen Jing , Zhang Fang Liang , Fu Jing
Published: August 2013

Seismic performance of RC beam-column joints under low cyclic loading with different cycle numbers was analyzed by FEA software, to study duration effect of long period ground motion. The loading with different cycle numbers was used to simulate the duration of the ground motion. Hysteretic curves and skeleton curves of the joints were obtained. The results indicate that as the cycle number increases, the capacity and ductility of the joint declines, and the stiffness of the joint attenuates faster.
Study of Free Vibration Characteristic of Continuous Box-Girder Based on Hamilton Principle
Authors: Zhou Wang Bao , Jiang Li Zhong , Huang Zhi
Published: August 2013

Based on Hamilton principle, the differential equation of free vibration and the corresponding boundary conditions of continuous box girder with consideration for the shear lag effect meeting self-equilibrated stress, shear deformation as well as rotational inertia were induced. The ANSYS finite element solutions were compared with the analytical solutions by calculation examples and the validity of the proposed approach was verified. The obtained formulas developed the shear lag theory. Some meaningful conclusions for engineering design were obtained. The contribution of the shear lag effect decreases each order natural frequency of the continuous box-girder, at the same time the higher the order natural frequency is, the greater the influence of shear lag effect on natural frequency of continuous box-girder is. The shear-lag effect of continuous box girder increases when frequency order rises, and increases while span-width ratio decreases.
Buckling Behavior of Elliptical Shells of Changing Thickness under Uniform Axial Compression
Authors: Wan Li , Chen Lei
Published: August 2013

Many elliptical shells are used in structural applications in which the dominant loading condition is axial compression. Due to the fact that the radius varies along the cross-section midline, the buckling behavior is more difficult to identify than those of cylindrical shells. The general concerned aspects in cylindrical shell buckling analyses such as the buckling mode, the pre-buckling deformation and post-buckling deformation are all quite different related to specific elliptical shell geometry. The buckling behavior of elliptical cylindrical shells with uniform thickness has been widely studied by many researchers. However, the thickness around the circumference may change for some specific structural forms, the femoral neck for example, which makes the buckling behavior more complex. It is known that the buckling strength of thin cylindrical shells is quite sensitive to imperfections, so it is natural to explore the imperfection sensitivity of elliptical shells. This paper explores the buckling behavior of imperfect elliptical shells under axial compression. It is hoped that the results will make a useful contribution in this field.
Analysis of Mechanics Characteristics of Prestressed Steel Column in High Temperature (Fire) Condition
Authors: Sun Qiang , Hu Yan , Wang Ding Tang
Published: August 2013

According to the requirements of fire scientific theory and the fire resistance design of structures, and combined with the practical engineering and based on the building damage situations that may occur, this paper analyzes the characteristics of mechanical behavior of prestressed steel column in high temperature condition (fire). It puts forward that how to consider the effects of high temperature parameters and prestressed loss on the structural bearing capacity in prestressing steel column design, and may provide reference values for the fire resistance design of steel structures.
Mechanical Mechanism of the Post-Grouting Pile
Authors: Wang Bin , Zhang Jie
Published: August 2013

The bored piles are widely used in engineering, but also a lack of understanding of the mechanical mechanism of post-grouting technology, design and calculations based on the experience. Using FLAC3D finite element software, analyzing from axial force, pile lateral friction, pile end resistance to improve the carrying performance. Simulation data and field test QS curves is almost consistent, verifying that the model is correct. Contrasting between the not-grouting pile and grouting pile, finding that the limit lateral friction and end resistance of grouting pile have significantly increased in the maximum loads.
Dynamic Analyses of Semi-Rigid Connection Low Yield Point Steel Frames
Authors: Ma Cui Ling , Sun Song Dan , Cao Xian Lei
Published: August 2013

Based on the analysis for 10 series (altogether 50) of finite element analytic models, the time-history analysis is discussed in this paper to investigate the relations between frame parameters of semi-rigid steel frames, these parameters include the frame's floor number, the frame's span number, especially the rotation stiffness of beam-to-column connections. Comparing with the steel frame structure, the ductility of semi-rigid steel frame structure is improved with the reduction in the rotation stiffness of connections. Furthermore, semi-rigid steel frame structure under seismic loads has a good seismic performance.
The Calculation of the Two-Layer Beam Model on an Elastic Basis with Variable Modulus of Subgrade Reaction
Authors: Andreev Vladimir Igorevich , Matveeva Alena Vladimirovna , Barmenkova Elena Vjacheslavovna
Published: August 2013

In the present paper is given the calculation of the two-layer and the single-layer beam models on an elastic basis with variable and constant modulus of subgrade reaction. The two-layer beam is the beam of variable rigidity, the lower layer simulates the foundation, and the upper - the structure, at the same time is considered the weight of each layer. In the results of calculations of beams, as the two-layer and the single-layer, the values of the internal forces and stresses are obtained more with variable modulus of subgrade reaction than with constant. With consideration of the two-layer and the single-layer beam models with the same characteristics of the base, the values of internal forces, generated in two-layer beams, are obtained much more.
Experimental Study on Flexural Behavior of Different Damages Prestressed Concrete Hollow Slabs Strengthened with CFRP
Authors: Han Juan , Liang Yin
Published: August 2013

The purpose of this paper is to focus on studying its flexural behavior after different damages prestressed concrete hollow slab is strengthened with CFRP.By the experimental method, twelve residential prestressed concrete hollow slabs are tested under concentrated force at the two points of the symmetrical load in order to analyze both flexural behavior and effects factored by different bonding modes.The conclusion can be drawn that the flexural behavior of prestressed concrete hollow slabs strengthened with CFRP is well-tried.It provides design suggestions and reference for prestressed concrete hollow slabs strengthened with CFRP, and also provides an experimental basis for the repairing and reinforcing practical engineering application in Wenchuan disaster area.
Research on the Axial Compressive Performance of the Concrete-Filled Steel Shear Wall with Binding Bars
Authors: Chen Lan , Li Xu Chun
Published: August 2013

The concrete-filled steel shear wall with binding bars is a new kind of lateral force resisting structure, which assembles binding bars with certain spacing. The behaviors of the structure under axial compression, containing bearing capacity and ductility, are studied by the software ABAQUS. Some factors as length-width ratio, bar spacing, steel thickness and material's strength grade, are taken into account. The results show that the axial compressive bearing capacity factor λ increases with length-width ratio b/t increasing; the factor λ, the ductility factor DI and the vertical displacement decrease with bar spacing d increasing; the bearing capacity factor of steel plate λs and DI increase while the factor λ decreases with steel thickness ts increasing; and with the concrete's strength grade and steel's strength grade improving respectively, both the factor λ and DI decrease. At the same time, the structures simplified formula under axial compression is presented.
Encased-Steel-Reinforced Concrete Composite Beam and its Ultimate Strength Analysis
Authors: Suo Yuan , Li Xiao Dong , Yuan Wei Ning
Published: August 2013

Compared with traditional steel-concrete composite beam,authors describe a new composite beamencased-steel-reinforced concrete composite beam , introduce the advantages of this new composite beam,and establish the formula of ultimate bearing capacity.
Behavior and Design of Web-Slotted Cold-Formed Channels Experiencing Local-Distortional-Global Interactive Buckling
Authors: Liu Shuai , Ma Qi Jie , Wang Pei Jun
Published: August 2013

This article aims to shed light on the nonlinear local-distortional-global interactive behavior of web-slotted channel columns by use of the finite element method. The effects of three kinds of initial geometric imperfection based on different distortional buckling mode were evaluated. It indicates that different distortional buckling mode does little difference on the nonlinear interactive buckling behavior of web-slotted channels. Based on the extensive parametric study, some modifications were made to the traditional Effective Width Method for the practical design of web-slotted channel columns undergoing local-distortional-global interactive buckling.
FEM Analysis of Long-Span Steel Structure Considering Bearings Size Effect and Friction Characteristic
Authors: Cui Can , Sun Wen Bo
Published: August 2013

In previous analysis and design of steel structure, connections (especially bearings) of construction membership in long-span structures are usually considered as rigid, partially released or entirely sliding. Practically, construction members mechanical property is always not idealized in rigid, released or entirely slide situation. In some cases, the joints are relevant in geometry deformation. In this paper, mechanical property of bearing will be researched considering bearings size effect and friction characteristic, and results will be statistically analyzed.
Calculation Method of Deformation and Inner Force of a Sheet Pile Wall with Relieving Platform
Authors: Hu Yun Long , Liu Guo Nan , Zhao You Ming
Published: August 2013

Sheet pile with relieving platform is new type of retaining structure which has been successfully used for reinforcing slopes in Shenzhen city, China. The stress and deformation of sheet pile with relieving platform are very complex owing to the existence of relieving platform. In this paper, the authors divide the sheet pile with relieving platform into loaded segment and anchored segment and developed a numerical model to calculate the inner force and deformation of the sheet pile with relieving platform. Finally, the authors use FEM model and fielding monitoring data to investigate the effectiveness of the newly developed calculation model.
Low Tension-Tension Cycle Fatigue Properties of 301 Stainless Steel Thin Sheets
Authors: Cui Shi Ming , Wang Rui Dong , Liu Yong Jie , Long Tao , Zhang Wei , Wang Qing Yuan
Published: August 2013

By using of a micro mechanical fatigue testing system, low tension-tension cycle fatigue properties of 301 stainless steel thin sheets with a thickness of 0.1 mm were studied. The effects of loading frequency and stress ratio were considered in the tests. The results show the S-N curves descend continuously in the low cycle regime. Cyclic σ-N curve was obtained according to the traditional fatigue theory. It agrees well with the experimental data, showing that the traditional fatigue research methods are also suitable to describe thin sheets in a certain extent. With the increase of loading stress ratio, the fatigue strength of thin sheets is increased. There is an evident effect of frequency on the fatigue behavior of the thin sheets.
Study on the Effect of Grid Column on Seismic Performance of Improved Multi-Ribbed Slab Structure
Authors: Qian Kun , Wang Miao , Zhang Jie , Yuan Quan
Published: August 2013

In order to confirm the calculation model of multi-ribbed slab structure and transmission of earthquake action, this paper improved existing multi-ribbed slab structure. The calculation model of improved multi-ribbed slab structure confirmed the stress relationship among three seismic fortification lines, and the transmission of earthquake action became clear, the same calculation model could be applied in structural analysis. For studying the effect of characteristic parameters of restoring force changing in the second seismic fortification line on seismic performance, and correcting the parameters, this paper analyze push-over model of the second seismic fortification line to get the static pushover curve. According to the study, the amount of steel bar in grid column and sectional dimensions of grid beam made the major effect on characteristic parameters of restoring force in the second seismic fortification line. The growth of steel bar’s sectional area in grid framework and the yield strength are mainly in direct proportion. It is more reasonable that simultaneously alter steel bar’s sectional area in grid frame and dimensions of grid framework to adjust characteristic parameters of restoring force changing in the second seismic fortification line.
The Failure Process Analysis of Reinforced Concrete Beams with Different Steel Reinforcement Ratio
Authors: Yang Ji Xin , Huang Kun
Published: August 2013

In this article, we will do a numerical simulation of reinforced concrete beams (under-reinforced beam, balanced-reinforced beam, over-reinforcement beam). Analysis shows that use Solid65 element can simulate the nonlinear mechanical properties of the reinforced concrete beam under different reinforcement ratio better. So we think that the finite element software can be used to calculate the mechanical behavior of the reinforced concrete.
Dynamic Analysis for Wind Turbine Composite Blade
Authors: Zhou Li Qun , Xing Shuai Heng , Li Yu Ping
Published: August 2013

Wind turbine blade model is analyzed based on finite element method. Research and comparison of blade natural frequencies is made in different rotational working conditions taking into account external factors such as the rotational inertia force. Also the relationship between the composite ply angle and natural frequency is analyzed. The result shows that the nature frequency of wind turbine blade is influence greatly by the stress stiffening effect for the blade rotation. And the nature frequency of wind turbine blade can be designed by adjusting the single fiber layer ply angle of blade.
Analysis of Aerodynamics Behavior of FGM Cylindrical Panel
Authors: Yang Li , Hao Yu Xin
Published: August 2013

An analysis on the aerodynamics behavior of a FGM cylindrical panel in air flow subjected to an external excitation is presented in this paper. Material properties of the constituents are assumed to be temperature-independent and the effective properties of FGM panel are graded according to a simple power law function in terms of the volume fractions in thickness direction. Based on von Karman hypothesis and Hamilton’s principle, the nonlinear governing equations of motion are derived. Galerkin’s method is then utilized to obtain a two-degree-of-freedom nonlinear system including the quadratic and cubic nonlinear terms. A third-order piston theory is applied for the aerodynamic load. The bifurcations are presented for FGM panel by numerical simulation to show the influences of in-plane load on the nonlinear dynamics.
The Study of Automotive Aluminum Alloy Radiator Tank's Leakage
Authors: Gu Jie , Yang Xue Feng , Ma Tao , Feng Zhen Shan , Li Lei , Liu Ci Ling
Published: August 2013

Contraposing radiators leak problem in a short time using, it is found existing S, Cl, O etc in leaking place by the analysis of the EDS spectrum. So the cause of the radiator tank leaks were written as follows: unqualified freezing liquid was used in water tank, or unqualified cooling water was added during the vehicle. Its high hardness and destructive Cl-, S2 ion and the oxygen enrichment conditions have stimulated and accelerated action on the pitting corrosion of aluminum alloy, lead to producing scale lateral in waterproof surface, then pitting corrosion and perforation failure were occurred early. The problem can be solved by improving the quality of the cooling fluid, or replacing aluminum alloy material in waterproof surface.
Test and Analysis of Machine Center's Principal Spindle Thermal Characteristics
Authors: Lin Jian Feng , Liu Kuo , Tan Zhi , Wu Yu Liang
Published: August 2013

The significance and present situation of machine tool's thermal characteristics test technology is expatiated first. Aiming at certain three-axis vertical machine center's mechanical principal spindle, thermal characteristics test is done when principal spindle's temperature is rise and fall. Spindle thermal error analyser is used to test machine center's thermal errors in X, Y and Z directions and monitoring temperture of spindle. The spindle's temperture and thermal errors are presented and the test results are analyzed at last. The machine center's thermal information are mastered through test data and analysed results.
Numerical Simulation and Experimental Study on Fluid-Filled Hemispherical Shell under Impact
Authors: Yang Hui Wei , Qin Bin , Han Zhi Jun , Lu Guo Yun
Published: August 2013

The dynamic response of fluid-filled hemispherical shell in mass impact is studied by experiment using DHR9401. Combining the time history of impact force with experimental observation of the deformation process, it can be seen that the dynamic response can be divided into four stages: the flattening around the impact point, the forming and expanding outward of shell plastic hinge, the plastic edge region flatten by the punch, and elastic recovery. The experimental results show that: Because the shell filled with liquid, the local impact load that the shell suffered is translated into area load and loads on the inner shell uniformly, so that it has a high carrying capacity. Numerical simulation is used to study the time history of energy absorption of different shell structures. The result shows that the crashworthiness of sandwich fluid-filled shell is improved greatly. Under the certain impact energy, deformation of its inner shell is very small, which can provide effective security space.
Design and Analysis of Force Sensor for Condition Monitoring System of Ball Cold Heading Forming
Authors: Zhang Qi , Li Ying Jun , Ma Ru Jian , Men Xiu Hua
Published: August 2013

In order to solve the forming defects in the steel ball cold heading process, a novel force sensor which chooses the PVDF piezoelectric films as force-sensing elements is designed. The advantages and disadvantages of piezoelectric force sensor on measurement of the cold heading force are compared with existing force sensors. By using FEM, sensor’s linearity and the structure size are analyzed. Compared with the traditional sensor, this structure is more reasonable. The presented PVDF piezoelectric force sensor has wide frequency range, good dynamic performance, and can realize dynamic measurement.
A Novel RFID-Based Thermal Convection Accelerometer with Heater and Thermal Piles Deposited by E-Gun Focused on Mixing Powders of Metals
Authors: Lin Jium Ming , Lin Cheng Hung
Published: August 2013

This paper proposes an innovated method to integrate an active RFID tag with a thermal convection accelerometer with heater and thermal piles deposited on a flexible substrate by E-gun, thus it is a wireless sensor for easy usage in many fields. The other advantages of the new device are as: (1) The thermal conductivity (λ148W/(mK)) of the traditional Si is about 25 times of the proposed polyimide substrate (λ6-0.17W/(mK)), thus the power leakage through the substrate is reduced. (2) The heaters and the thermal piles are deposited by E-gun focused on a target of mixing powders of metals on the flexible substrate, so it is different from the traditional ones by using the structures floating over a grooved cavity. Thus the new device is not only easy to make, but more reliable to operate in large acceleration impact condition without damage. (3) The thermal piles are divided into two portions respectively exposed to a cold region and a hot region. The cold junctions of thermal piles are put outside the cap to make it exactly at the room temperature, thus the device is very easy to calibrate and more accurate. (4) The chamber is filled with another kind of gas such as Xe or Ar to avoid the oxidizing effect produced by the commercial ones with carbon dioxide or air, and then the reliability as well as the life cycle of the heater can be increased. (5) By the results of simulation, one can see the traditional rectangular chamber can be replaced by a hemi-cylindrical one to extend both the operation range and sensitivity of the thermal convection accelerometer.
Research of Steer-by-Wire Technology on Articulated Wheel Loader
Authors: Wang An Min , Tang Ming , Li Jun Ying
Published: August 2013

The development and characteristics of Steer-By-Wire is introduced and the design of Steer-By-Wire in articulated wheel loader is fully discussed in this paper. The whole system takes advantage of proportional decompression valve to control the motion of preferential flow amplifier valve, and further to achieve steering by controlling steering cylinder. Whats more, this paper has also elaborated on a design of new-type steering angle detection devices of vehicle frame, which aims at more accurate corner detection and is also a breakthrough in steering system of wheel loader.
Transformation Design of Mixed Injection Molding Production Line
Authors: Zhou Xi En , Luo Fei , Deng Xiao Yan , Che Feng Jiao
Published: August 2013

Due to the problems of the traditional mixed injection molding production, such as unsatisfactory of the injection molding machine cylinder temperature control, the dispersed devices, the low automation degree and the lack of supervision for the whole production process, the production line of the mixed injection molding machine has been modified. The fuzzy self-adaptive PID control method is used to improve the temperature control accuracy and stability. Two sets of equipments of the injection molding machine have been communicated via the bus technology to realize automation production. And the computer monitoring system has been designed by VB technology to monitor the operating status and parameters of the entire production process. This transformation design can achieve to shorten production cycle, reduce labor costs and covering area, and also improve the production automation level and efficiency.
Marker-Based Target Location and Recognition for Visual Robot
Authors: Xu Wen Long , Chen Guo Hua
Published: August 2013

To solve geometric object crawling issues for visual robot,here we try to place series of specially designed markers in the geometric center of the surface, and store the relevant information of the corresponding object to the identified ID,so that the object crawling issue has become the the location and identification of markers ID.In this paper the author designs a marker system on Hamming code, detects the identity quadrilateral by counterclockwising finishing contour point and calculating the the contour perimeter in the image processing procedure,and then identifies the ID with the the decoding theory. Simultaneously Harris algorithms are chosen to extract the four corner coordinates of the sub-pixel accuracy. Experiment and theory show that the method can achieve the object location and recognition .
Numerical Simulation of Bionic Locomotor Batoid with Combined Frequency Undulating Pectoral Fins
Authors: Wu Zhi Jun , Chen Wei Shan , Shi Sheng Jun , Xia Dan
Published: August 2013

Batoids propel themselves forward by generating waves along their large pectoral fins. According to the observation of batoids in nature, the frequency of the wave on the pectoral fins is not always invariable. The bionic batoid is composed of rigid body and flexible pectoral fins of uniform thickness. In this study the hydrodynamic analysis of bionic batoid with combined frequency specified on the pectoral fins are presented. The combined frequency is implemented by the frequency conversion during the oscillation of each pectoral fin ray. Since oscillating frequency of 2.2Hz is mostly observed in rajiform batoid, the variable frequencies ranging from 1.0Hz to 2.6Hz with 0.4Hz increment compound 2.2Hz and formed five different sets of combined frequency. The simulation results illustrate that the bionic batoid model with combined frequency locomotion can achieve better propulsive efficiency, which maybe benefit for the motion design of bionic robot batoid.
Developments in Research on Seedling Auto-Picking Device of Vegetable Transplanter
Authors: Jin Xin , Li Shu Jun , Yang Xue Jun , Wu Jian Min , Liu Zhong Jun , Liu Han Kun
Published: August 2013

Seedling auto-picking device is one of the most important working parts of a vegetable automatic transplanter. Its performance determines the transplanting quality, reliability and operation efficiency. The current developments of the seedling auto-picking device were discussed, and several typical devices were introduced in this paper. The existing problems of seedling auto-picking devices of different picking methods were pointed out. With the advantages of accurate location, high efficiency and easy picking, the mandril-type seedling picking was thought as the better transplanting mode of vegetable plug seedling. At the same time, the development direction of auto-picking devices of vegetable automatic transplanter was provided.
Dynamics Simulation Analysis of Exchange Cutter Manipulator Based on RecurDyn
Authors: Ma Qiu Cheng , Fang Teng , Fang Zhi Xiang , Lu An Ge
Published: August 2013

This paper introduces a new kind of cam curve used in automatic tool changer based on the Exchange Cutter Manipulator 3d model established by the new cam curve and the use of RecurDyn to do the dynamics simulation. Comparing the establishment of the modify sine curve with the Exchange Cutter Manipulator, the new type curve of the Exchange Cutter Manipulator have smaller impact.
Dynamic Analysis and Structure Optimization of Linear Vibration Screen
Authors: Wang Yong Yan , Liu Xiao Liang , Wei Wen Bin , Qin Nan
Published: August 2013

Simulation of simplified the part structures of vibration screen by ANSYS software, and then establishes the finite element model of the linear vibration screen. Modal analysis and harmonic analysis of finite element model, and then according to the analysis results corresponding local structural modifications and adjust the center of mass of the modified vibration screen. Last verified the rationality of structure optimization.
Shear Strength and Failure Angle Analysis of Fillet Welds Based on Structural Stress Approach
Authors: Nie Chun Ge , Zhao Wen Zhong , Wang Yue Dong
Published: August 2013

With conventional shear stress formula given in AWS B4.0, huge difference of strength between longitudinal and transverse fillet welds exists, and different failure angle of two type welds could not be interpreted. In this paper, a mesh-insensitive structural stress based shear strength definition is presented for correlating weldment test data obtained from longitudinal and transverse fillet welds in literature. Finite element model were created according to the geometry of specimens, and shear stress at different cut plane of weld were calculated. Failure angle could be interpreted reasonably for two type fillet welds, and discrepancies in shear strength between transverse and longitudinal shear tests can now be reconciled, resulting in a single shear strength value regardless of specimen types and loading conditions with this proposed approach.
Effective, Controlled Method to Add Sulfur into Molten Steel to Produce Free Cutting Steel for Automobile
Authors: Zhang Tie Jun
Published: August 2013

In order to produce required free-cutting steel billets for auto industry, it is necessary to provide steel with correct content of sulfur. Effective, controlled method adding sulfur is very important in the production of sulfur free-cutting steel of consistent microstructure and hence mechanical properties and machinability. Because traditional methods of adding sulfur in steel can not provide stable results and always cause environmental pollution problems, the sulfur cored wire injection process was introduced. Stable results were obtained, and effects of parameters such as feeding rate, etc on sulfur recovery are investigated. The experimental results show that the mean recovery of sulfur was 80%, the treatment time of adding sulfur was about 2 minutes, and the refining period was shortened. Favorable metallurgical achievements and economical benefits were gained.
Effect of Isothermal-Rolling Process on the Morphology, Size and Distribution of Type II MnS
Authors: Xia Yun Jin , Fan Ding Dong , Wang Shi Jun , Li Jie , He Yun Long
Published: August 2013

The effect of isothermal-rolling process on the morphology, size and distribution of type II MnS was studied based on Gleeble-1500 simulator. The experimental results show that the relative plasticity of type II MnS increases with deformation temperature decreasing, but, it increases first and then decreases with deformation amount increasing; Heavy compression deformation is beneficial to improve the distribution of type II MnS; The changing trends of the size of type II MnS for varying deformation amount are basically same with deformation temperature changing, i.e. the average length of sulfides is shorter, and the average width is wider at high temperature rolling process; Under the same deformation temperature, the average size of type II MnS shows cyclical change with deformation amount increasing.
Research on Dyeing and Finishing Technology of Polylactic Acid Fiber
Authors: Fu Zhong Jun , Huang Hao Fei , Yu Lu Shan , Wang Hong
Published: August 2013

In this paper, polylactic acid fabric (PLA) was dyed with five different disperse dyes and the effect of dyeing parameters including time and temperature on the dyeing adsorption%, K/S value and the strength properties were studied. The recommended disperse dyeing conditions and dyeing profiles were also summarized.
Synthesis and Application Research of op-10/ Cationic Surfactant Composite Asphalt Emulsifier
Authors: Jin Su Rong , Zhang Ke , Pang Jin Xing , Song Shan Shan
Published: August 2013

In this paper, the non-ionic intermediate was prepared by op-10 and epoxy chloropropane; the quaternary ammonium salt intermediate was prepared by triethylamine and epoxy chloropropane; the op-10/cationic surfactant composite asphalt emulsifier was synthesized by reacting with non-ionic intermediate, quaternary ammonium salt intermediate and N-octadecyl propylene diamine. The effect of synthesis conditions and the prescription on the emulsifying property, surface activity and using performance of emulsifier was studied, a new way for the preparation of the composite asphalt emulsifier was explored.
Solutions and Experimental Verification of Recycling of Micaboard Leftover Materials
Authors: Cheng Jian Wen , Zhang Gao Ke
Published: August 2013

For the abroad use of talc paper plate in electric industry, the production of man-made talc paper plate is increasing. The problem following is that process brings too much unrecycle talc paper plate leftover materials when the talc paper plate is cut out and molding. Those leftover materials always be abandoned as crab. It is not only environment pollution but also a waste of our resources. Our research wants to find a measure to make the talc paper plate leftover materials into pieces so as to be used again and realize the new clean production craft of man-made mica paper plate.
Response Frequency Characteristic under Loop Stress for the Material Deposited NiTi SMA Thin Film on PZT Substrate
Authors: Liu Qing Suo , Lu Cui Min , Yuan Lian Jie , Yang Wei Wei
Published: August 2013

The materials deposited NiTi SMA Thin Film on PZT Substrate is prepared by using the magnetron sputtering method and crystallizing at 600°C. The microstructure of the materials is evaluated by scanning electron microscopy (SEM), X-ray diffraction (XRD) and energy dispersed spectroscopy (EDS). The response frequency characteristic under loop stress is studied by damping test. The results show that the NiTi SMA thin film has oriented columnar crystals and the PZT substrate has uniformly equiaxed grains. There isnt obvious component exchange between NiTi SMA thin film and the PZT substrate, especially, there is of the original composition in the region adjacent to the NiTi SMA thin film of the PZT substrate. The deposition of NiTi SMA thin film has no impact to response frequency range under loop stress of the PZT.
Determination of B Impurities in Silicon by Inductively Coupled Plasma Emission Spectrometry
Authors: Liu Yao , Tan Yi , Zhang Lei , Liu Xin Ye , Li Ya Qiong , Li Jia Yan
Published: August 2013

This article provides a method to determinate boron (B) impurity in silicon by inductively coupled plasma emission spectrometry (ICP-AES), in which the element spectral and analytical parameters were optimized. Three factors that influence testing results were discussed, including the amount of mannitol (C6H14O6) addition, concentration of nitric acid (HNO3) and evaporated temperature. As a result, the experimental parameters and conditions were optimized. The method of the detection limit, recovery and precision were all awarded with satisfactory results.
Effect of Protein Variety on Properties of Gelatin Edible Films
Authors: Xun Qian Nan , Lei Qiao , Bao Jian Qiang , Huang Zhi Ying
Published: August 2013

Influences of whey protein isolate (WPI), sodium caseinate (NaCas) and soybean protein isolate (SPI) on gelatin (GA) film properties were investigated by comparing with common plastic films. The results suggested that WPI and NaCas caused tensile strength (TS) of GA film increasing from 6.38MPa to 7.17MPa,7.52MPa; water vapor permeability (WVP) decreasing from 18.46*10-13g m-1 s-1 Pa-1 to 17.92*10-13g m-1 s-1,16.46*10-13g m-1 s-1; and resulted in oxygen transmission rate (O2TR) decreasing from 128.315cm3m-2d-10.1MPa-1 to 37.352 cm3m-2d-10.1MPa-1, 38.129 cm3m-2d-10.1MPa-1.WVP of GA films increased 13.2% and O2TR decreased 4.1% as the addition of SPI. NaCas-GA composite films was the optimal group which had significant advantage on Ts, optical properties and barrier properties.
Investigations on Dynamic Puncture Behaviors of Integrated Composite Reinforced with Varying Fabrics
Authors: Lin Chia Chang , Li Ting Ting , Lou Ching Wen , Lin Jan Yi , Lin Jia Horng
Published: August 2013

The dynamic puncture resistance of multi-layer integrated composite which was comprised of glass fabric reinforcement or Kevlar fabric reinforcement and nonwovens were discussed as related to recycled Kevlar fibers amount, number of layer and K-ply position for purpose of cost reduction and performance improvement. The result shows that, 20 wt% Kevlar fibers contained in nonwovens have the optimum puncture resistance. And the dynamic puncture force increases linearly with number of layers, and also improves proportionally as increasing number of K-ply. The resultant multi-layer composite is expected to be used as body armor interlayer and packaging materials.
Mechanical and Electrical Properties of the Polyaniline (PANI)/Polylactic Acid (PLA) Nonwoven Fabric
Authors: Lin Chin Mei , Lin Ching Hui , Huang Yu Tien , Lou Ching Wen , Lin Jia Horng
Published: August 2013

Technical development and rapid telecommunication create convenient consumer products, but produce electromagnetic radiation that hurts the human body, which makes the development of antistatic and electromagnetic-wave-resistant textiles important. This study combines polylactic acid (PLA) fibers and low melting point polylactic (LPLA) fibers by needle punching to make PLA nonwoven fabrics. The lamination layer number is then changed to explore its influence on the mechanical properties of the PLA nonwoven fabrics. Next, the nonwoven fabrics are spray-coated with polyaniline (PANI) to form the PANI/PLA nonwoven fabrics. The PANI/PLA nonwoven fabric with a lamination layer number of 5 has the optimum tensile and tear strength. A coating of PANI can reduce the surface resistivity.
Super-Hydrophobic Film Prepared with Reduced Graphene Sheets and its Application as Corrosion Barrier to Copper
Authors: Wang Peng , Zhang Dun
Published: August 2013

Electrophoretic deposition is proposed to fabricate super-hydrophobic film on copper surface with reduced graphene sheets (RGSs). The resulted film was characterized with contact angle meter, scanning electron microscopy and so on. It is found that the film presents super-hydrophobic property with water contact angle of 150.4°. Air can be trapped in the island-like structure and intensify the wettability of film. Electrochemical measurements prove that super-hydrophobic film can inhibit corrosion process of underlying copper by inducing both anodic and cathodic current density. This method for super-hydrophobic film fabrication is facial and time-saving, and it will expand the application of RGSs in mechanical engineering.
Tensile Strength Characteristics on ETFE Film for Membrane Roof System
Authors: Lee Seung Jae , Shon Su Deok
Published: August 2013

ETFE is the abbreviation of Ethylen Tetra Fluoro Etylene, a sort of colorless and transparent granules. The advantage ETFE film has daylight transmission and chemical resistance, the aging resistance and lightweight. The thickness of ETFE film is used to from 50μm to 300μm and tensile strength of ETFE film changes from 40MPa to 60MPa and the tensile strain at break can get to about 300-400%. In this paper, ETFE film carried out the tensile proprieties, such as the tensile strain at break, the tensile strength are examined.
Fabrication of Al2O3 Ceramic Coating on AZ91 Biomedical Magnesium Alloy and the Corrosion Resistance in SBF
Authors: Wang Yun Long , Wang Shuo , Wang Miao , Shi Li Jie , Guo Hui Rong , He Zi Juan , Shi Xing Feng
Published: August 2013

Al2O3ceramic coating was fabricated on AZ91 biomedical magnesium alloy by plasma electrolytic oxidation. The microstructure of the coatings was characterized. The corrosion behavior of the coated magnesium alloy in simulated body fluids (SBF) was evaluated. The results showed that the as prepared coating was composed of crystal Al2O3, including much α-Al2O3and some γ-Al2O3. The Al2O3.coating showed porous surface and the biggest diameters of the holes were about 6-7 um, and the smallest were about 1 um. The corrosion tests in SBF indicated that corrosion resistance of Al2O3coated sample was significantly improved compared to the uncoated sample.
Manufacturing Technique and Property Evaluation of Eco-Friendly Kevlar/PET/Nylon Composite Geotextile
Authors: Lin Ching Wen , Hsing Wen Hao , Lou Ching Wen , Chen Jin Mao , Lin Jia Horng
Published: August 2013

This study produces composite geotextile, and evaluates its effectiveness of being used for soil protection. Kevlar fibers, high strength polyethylene terephthalate (HPET) fibers, recycled polyethylene terephthalate (RPET) fibers, and nylon grids are made into Kevlar/PET/Nylon composite geotextiles, which are then tested for air permeability, and tensile, tearing, and bursting strength. The experimental results show that when the ratio of Kevlar fibers to HPET is 0/40, the resulting composite geotextile has the optimum mechanical properties, where the tensile strength is approximately 990 N, tearing strength is approximately 890 N, bursting strength is approximately 3700, and an air permeability is around 35 cm3/cm2/s.