bluuebunny/crossref_metadata_2025 huggingface dataset:
Testing Technology for Grouted Density and Empty Hole of Prestressed Corrugated Pipe Based on Ultrasonic Wave
Authors: Wang Qing Zhou , Qian Hao , Ma Shi Bin , Ma Teng Fei
Published: August 2013

In order to explore detecting function for grouted density and empty hole ofcorrugated pipe, the paper proposes a method. Firstly, detect groutedcorrugated pipes and concrete (avoiding corrugated pipes) using elastic wave,judge defective corrugated pipes through comparative analysis of the data.Secondly, detect the defective corrugated pipes using ultrasonic wave, analysisthe test data, determine the specific location and size of defect in corrugatedpipes. Finally, verify by actual design. The result shows that judged locationand size of the empty hole are consistent with the actual situation. So it isfeasible to detect grouted density and empty hole of prestressed corrugatedpipe with the method. So as to provide theoretical guidance for grouteddetection of corrugated pipe.
Thermal Gradient and Crack Monitoring of Concrete in Large Foundation during Construction
Authors: Wang Jun Zeng , Cui Wen Sheng , Shi Yue Hua , Qin Lei
Published: August 2013

The embedded temperature and acoustic emission sensors were used for monitoring thermal gradient and crack development of the concrete in a large foundation. The results show that the vertical thermal gradient is obvious, while the transverse is relatively stable during 3 and 8 days, and when the peak temperature is reached at the third day after the concrete was cast, the crack development is most intense. Therefore, measures should be mainly taken to care the concrete, especially at the peak temperature.
Analysis and Experimental Study of Concrete Strength Detection
Authors: Zheng Yi , Jia Xue Bin , Zhang Ke Chao , Chen Jian Zhang , Wang Peng
Published: August 2013

Structural concrete strength rapid detection methods were analyzed, which mainly include Rebound Method, Ultrasonic-rebound Combined Method, Dirlled Core Method, Pull-Out Method. Technical characteristics, advantages and disadvantages of each method were compared and analyzed. Application of each method was analyzed. Based on current detection technical specification, ultrasonic-rebound combined method for testing concrete strength was analyzed. Actual concrete bridge as a platform for a comparative test, ultrasonic-rebound combined method test was carried out. Problems were put forward and recommendation was made through discussion.
A Study on the Quality Assessment System of Substructure Reinforcement Method
Authors: Zhang Wen Da , Xiao Yang Jian , Cheng Jun
Published: August 2013

For substructure reinforcement method, corresponding quality assessment system is established based on analytic hierarchy process (AHP). At the same time, the actual application process of the system was found. Structure of judgment matrix, synthetic weight and for each layer of element and fuzzy comprehensive evaluation was figured out. Finally, the system is verified by practical engineering. Something is obvious as the result shows. Firstly, the comprehensive assessment system for reinforcement quality of bridges is reasonable and practical. Secondly, this system takes some advantages to the systematization, standardization and theorization for the assessment to reinforcement quality of bridges.
Analysis of Technology and Economy for Steel Structure Reinforced with Carbon Fiber Sheets
Authors: Wang Jing
Published: August 2013

Fiber reinforced polymers (FRP) can be used to restore the stiffness and bearing capacity of the damaged steel structures and improve their fatigue resistance. The reinforcement technology has the advantages of fast construction, short cycle, environmental protection and can greatly reduce the cost of the projects. Because there is a large number of steel structure need reinforced in our country, the market potential is tremendous. With localization of FRP and technology advancement of material production, the reinforcement technology will have a stronger competitiveness. Combined with material properties, comprehensive cost, construction method, maintenance and other aspects of FRP, a comprehensive technical and economic analysis has been done for FRP reinforcement and repair technology of steel structure. It could be provided a theory basis and application reference for existing steel repair reinforcement technology.
Experimental and Numerical Investigation on Reinforced Concrete Beam-Column Joints
Authors: Wu Xiao Yong , Li Yang Zhou
Published: August 2013

The elasto-plastic analysis of reinforced concrete square columns was introduced to study the relationship between lateral force and curvature by using the open source program OpenSees. A pseudo static test on the inverted "T" shape reinforced concrete square column was conducted for the comparative analysis. The results indicated that the lateral force calculated by program agree with experimental data with an axial load ratio of 0.33. The calculated yield lateral force was 29.7 kN, the error was lower than 7% compared with experimental results. In addition, the cross-section curvature were obtained, which were difficult to obtain through the traditional experimental study, the calculated yield curvature was 1.825×10-5. The calculated results with different axial load ratios were presented in this paper, which showed that both the yield lateral force and curvature of reinforced concrete square columns were increased with low axial load ratio, and at the same time it could reduce some experimental work by using computer simulation.
Study on Renovation and Appraiser of Beijing Hutong Buildings
Authors: Hu Shou Xin , Liu Hong Bin , Yin Zi Yu
Published: August 2013

Beijing Hutong has been the symbolic building of old Beijing city for hundreds of years and today it still accounts for a large proportion in the old buildings. In this article, Appraiser work of structural safety reliability is firstly done for the selected Hutong buildings. Then Analytic Herarchy Process is used to do the weight analysis of renovation schemes focusing on four different aspectsstructural safety, historical value, architectural value and cultural and artistic valueso as to get a more reasonable renovation and Appraiser conclusion. The Appraiser method used in the article will provide some guidance and references for similar buildings renovation and identification.
Numerical Investigation on Shear Failure of Concrete Beam Strengthened by Bonded Steel Plate
Authors: Wang Da Guo , Wang Zhi Xiu , Xu Bing
Published: August 2013

Based on micromechanics, an elastic-plastic-brittle damage model of concrete beam reinforced with stick steel is proposed by considering the aggregate gradation curve algorithms and the heterogeneity. In the model, the concrete beam reinforced with stick steel is taken as a five-phase composite material that consists of the mortar matrix, coarse aggregate, bonds between mortar and aggregate, steel plate, and the adhesive layer between steel plate and concrete beam. Through the numerical investigation on shear failure of concrete beam reinforced with stick steel under external force, the results show that the model can clearly simulate microscopic plastic yield, and the initiation and extension of crack. The strength of the steel plate is relatively stronger, so it cant enhance the shear capability of the each side of the beam and the concrete beam bears the larger shear stress, which results that a large number of elements, from the supports to the load points, begin to yield. When the strain of the elements exceeds the yield strength, the elements will produce failure until the failure of the whole specimen. The final failure mode of concrete beam reinforced with stick steel is the shear failure.
Performance Evaluation of Existing Reinforced Concrete Bridge Based on Reliability Analysis
Authors: Peng Wei , Hou Hai Tao , Wang Lu Lu , Ye Wen Ya
Published: August 2013

Considering the resisting force variation with time, JC method was adopted to calculate the reliable indicator of the reinforced concrete bridge with simply supported beams based on the field test data. Combined with the classification of security evaluation, the bridge is evaluated as type 5 and rebuild measure was suggested.
Research on the Impact Factors of Reliability and Comparison in the Design of Building Structures
Authors: Feng Hong Wei , Wu Yi Meng
Published: August 2013

With the development of China's science and technology and economic construction, the structural design of the reliability theory, security and reliability level of economic balance facing new development. This paper analyzes the impact factors of reliability in structural design, in order to do some preliminary exploration for the specification revision and adjustment of reliability design.
Study on a New Kind of Pile-Stinging Prestressed Concrete Pipe Pile
Authors: Zhao Xin Tong , Yin Xin Sheng
Published: August 2013

This article offers a new style of pipe pilestinging prestressed concrete pipe pile on the basis of the prestressed concrete pipe pile. The document introduces the construction technology. At first, reserve holes in pile in advance, then press concrete blocks into the soil throughout the holes by workers or construction equipments. The author also carried on the finite element analysis, established a common prestressed concrete pipe pile model PZ and a stinging prestressed concrete pipe pile model CZ. The results showed the value of bearing capacity of CZ increased by 9 %comparing with PZ.
The Determination of Friction Coefficient between Parallel Wires in Stay Cables
Authors: Li Hong
Published: August 2013

To measure and determine the friction coefficients of steel wires accurately is one of the prerequisite for analysing the local bending stresses in staycables. Three test schemes to simulate the real working state of the steel wire, the test value and its variation trend shows that the friction coefficient of high-strength steel wires decreases with the pressure increase, and then becomes stable when the positive pressure is too large.
Finite Element Analysis of Cold-Formed Lipped Channel Columns with Web Stiffener
Authors: Chen Ming , Liu Zhan Ke , He Zi Qi
Published: August 2013

A total of 18 cold-formed lipped channel columns with web stiffener were analyzed by using the finite element program of ANSYS. Varying length and axial force eccentricity were concerned to observe the buckling modes, load carrying capacities and deformability of the channel section columns.All the results can be the reference for later experimental study.
Experimental Research on Steel Frame Structures of Mobile Buildings
Authors: Cai Xue Feng , Lian Meng Yi , Zhang Zheng , Ma Yong Chao , Zhou Ji Zhong
Published: August 2013

Static tests were conducted on a two-story mobile building under wind loads, and the building is composed of two box units of steel frame structures. The mechanical behavior and the deformation performance of the structures were investigated. Based on the principle of static equivalent, the horizontal loads to load points of the top of the columns were imposed to simulate the wind loads. The displacement values and relative shifting values of the frame structures were obtained. The tests results show that the horizontal deflections of the mobile buildings are greatly affected by the relative shifting of the separate box units. And the conclusion also applies to the container buildings.
Effects of Geometrical Factors on Wind Pressure Characteristics of Cylindrical Roofs with Wind Tunnel Tests
Authors: Chen Bo , Yang Qing Shan
Published: August 2013

With wind tunnel tests, simultaneous pressure measurements are made on 4 cylindrical roof models with different rise-span ratios and roof inclinations. Effects of these geometrical factors on wind pressure characteristics of the roofs are investigated, including mean pressure coefficients, RMS pressure coefficients, skewness, kurtosis, and probability distributions of wind pressure. Results show that the mean vertical wind force coefficient of high rise-span ratio roof is larger than that of the low rise-span ration roof; the mean pressure coefficient distribution of the low rise-span ratio roof is similar to that of RMS pressure coefficients and the skewness (or the kurtosis); the vortex center line occurs at the windward edge for the low rise-span ratio roof with inclination 0°, which occurs at the roof apex for the high rise-span ratio roof. The roof inclination has more effects on the low rise-span ratio roof, the vortex moves from the windward edge to the apex for the roof with inclination 7.2°when the wind flows from the low eave to the high eave. The distribution of the skewness is strongly correlative to that of the kurtosis. The probability distributions of the roof edges and corners deviate obviously from the Guass distribution. If this point is ignored, the peak suction pressure will be underestimated.
Optimization and Suggestions of Design for RC Frames with Special-Shaped Columns Based on Chinese Specification
Authors: Wang Ming Dong , Ni Zheng Yin
Published: August 2013

To optimize the design of RC frames with special-shaped columns, some special care should be given to the design of this type of structure. Designers should attach great importance to concept design by considering the structure as a whole to assimilate seismic energy. Ductility has to be guaranteed both for the structure and for the members. In high-rise buildings, frame-shear wall structure is preferred. Safety of L-shaped Corner columns is to be improved or otherwise cantilever beams can be designed to prevent progressive collapse.
The Calculation of Flexural Capacity of Reinforced Concrete T-Section Beam under the Influence of Fire
Authors: Su Min , Gong Hao Jun
Published: August 2013

According to the reduction of concrete and steel strength under the impact of fire, this paper studies the flexural capacity of concrete T-section beam after fire. Through meshing cross section, the residual strength of each unit material can be obtained from the respective temperature. Then find a matrix for the discrete numerical values and summarizes equations of flexural capacity at mid-span and support after fire respectively.
Influence of Concrete Strength of the Core of the Joints on the Holistic Resistant Behavior of Super High-Rise Structure
Authors: Yang Zhao , Yu Xiao , Zhong Yang Zhi
Published: August 2013

In the construction process of the super high-rise concrete structure, it’s easy to be happened that the concrete strength of joints can’t meet design requirements. Some finite element models of a super high-rise building were established by MIDAS in the paper, which were used to analyze the influence of concrete strength of the core of the joints on the holistic resistant behavior. The study may provide the basis for solving the construction quality problems of the core area of joints
An Engineering Mechanics Based Approach to Predict Safety of RC Columns under High Temperatures
Authors: Yao Yao
Published: August 2013

Up till now, the design code for the determination of fire resistance of reinforced concrete (RC) columns is essentially based on tabulated data. Clearly, a more scientific approach based on an understanding of the fundamental behavior of columns in fire is timely andwill be useful to structural engineers. This paper develops a straightforward and rational method to predict the fire resistance of RC columns，which is based on the traditional Rankine approach. The effect of shear bond, if included in the Rankine approach, will yield moreaccurate predictions. Material deterioration at elevated temperature with regard to the strength and stability of columns is also quantified.
Study on Failure Mechanism of Reinforced Concrete Frame with Construction Joint
Authors: Yan Xi Kang , Ma Kang , Wang Su Duan , Chen Qian Qian , Hou Xiao Lei , Qin Ling
Published: August 2013

According to the quasi static test of reinforced concrete frame with construction joints in, the fracture crack sequence, fracture morphology and plastic hinge are studied in detail. Research shows that two kinds processing method of construction joint will not affect the destruction form of a frame structure, but destruction order .
Fatigue Stiffness Analysis of Corroded RC Beams
Authors: Chen Yi Hu , Chen Mu Jie , Sun Ling Yun , Wang Xung Meng
Published: August 2013

In order to study the influence on RC beam fatigue stiffness with different corrosion rates, fatigue load tests have been taken on a set of different corrosion ratios, and the changes in stiffness to the related beams also been calculated based on the deflection of the test beams. And then, the corresponding test analysis is achieved. The results show that: the rate of increase to the deflection of specimen tends to increase and stiffness drastically reduces with the increase in the extent of corrosion under fatigue loads.
Research on the Seismic Performance of Zipper Frames
Authors: Yu Hai Feng , Wang Tian Ya , Shi Li Bin
Published: August 2013

In order to investigate the seismic performance of zipper frames, three 10-storey structure models, including a zipper frame with tension zipper columns, a zipper frame with weak zipper columns and a chevron braced frame, were designed. Some indexes, including the natural periods, steel consumption and dynamic response under frequent and rare earthquakes, were analyzed and compared. The results show that, the dynamic responses of the three structures are similar to each other and all of them can meet the requirement of no-damage under frequent earthquakes and no-collapse under rare earthquakes provided by the GB50011 code, but the steel consumption for the zipper frames is less than that of the chevron braced frames, indicating the comprehensive seismic performance of the zipper frame is better than the chevron braced frame. However, it is also found that the design method of the zipper columns is conservative and a more reasonable design method of the zipper columns is needed to be provided.
Optimization System Design for Steel Structure Based on Advanced Complex Method
Authors: Zhu Jie Jiang , Zheng Yin Rui , Gong Ming , Wang Ying
Published: August 2013

The elementary unit of the optimization system for steel structure is optimization group. The optimization system takes advantage of the inheritance and polymorphism of VC++ to optimize the members with different amounts of variables or using different codes concurrently. The structure of the introduced system has good adaptive capacity of increasing optimized sections, as well as adding or updating codes. The constraints setting of the system can be adjusted according to the steel structure codes of different regions, which are mainly based on prevailing Chinese codes at the current phase. The system uses an advanced complex method which makes the result of optimization easier to be used in practical engineering since being available for discrete variables.
Comparison of Multiple Freeze-Thaw Cycles of High-Performance Concrete Test Beams and Concrete Beams Loaded Test
Authors: Li Zhi Qiang , Zheng Xian Chun , Cong Xiao Hong
Published: August 2013

This study focuses on the following: analysis of the basic mechanical properties of freeze-thaw cycles BFRP composite; freeze-thaw cycle on BFRP reinforced concrete structures force performance; provide experimental basis for the the basalt FRP freeze-thaw environment concrete structure andtheoretical support.
The Static Stability Analysis of Single-Story Steel Frames with I-Section Columns
Authors: Liu Ying Chun , Zhang Wen Fu , Ji Jing , Xie Dan , Du Juan
Published: August 2013

Static stability analysis to 12 kinds single-story steel frames with I-section columns is analyzed based upon bilinear lateral force versus displacement framework curve and finite element method, then ultimate displacements are obtained. In comparison, the framework curves and ultimate displacement calculated by modified stiffness and cross-section plastic moment theory accord with that calculated by finite element method. This provides the referential basis for the static stability analysis to a single-story steel frame.
Dynamic Response Analysis of the T-Shaped Steel Reinforced Concrete Column under Different Impact Conditions
Authors: Bai Shou Yan , Jiang Jing , Xu Ya Feng
Published: August 2013

This paper simulated the resistance to lateral impact properties of the T-shaped steel reinforced concrete column through the large finite element software ABAQUS. Extracting the time-displacement curves of different impact sites, by comparison we know: with the impact site is farther and farther from solid end, the maximum lateral displacement in the impact site of the member is bigger and bigger. The maximum displacements in the symmetrical place to the mid-span of the member are very similar. From time-displacement curves of seven models we can know, after reaching the ultimate bearing capacity, the curves leveled off gradually and changed slowly showing good stability and showing good ductility and deformation capacity. It can be concluded: the impact different parts of the dynamic response of lateral impact of the T-shaped steel reinforced concrete columns have a certain impact.
Experimental Study on Lateral Stiffness and Dynamic Properties of Steel Drive-in Storage Racks
Authors: Cheng Bo , Wu Zhen Yu
Published: August 2013

The static and free vibration tests were carried out to investigate the initial lateral stiffness and dynamic properties of steel drive-in storage racks. The bracing configuration and friction between pallets and rail beams were taken into consideration. The static test results indicate that the tested storage racks show sideways and torsional deformation modes under the single-point horizontal force. Both top plan bracings and back spine bracings can change the load transfer through the rack framework, strengthen the initial lateral stiffness of racks, but only back spine bracings can affect the natural frequency and damping ratio of racks. The friction force between pallets and rail beams makes pallets act as links to connect adjacent rack columns, so the pallets are beneficial factors to increase the lateral stiffness of storage racks. Compared with unload racks, the natural frequencies of loaded racks are smaller.
Experimental Analysis on Composite Wall Plate Cracking of Steel Structure in Yunnan Area
Authors: Shen Jian Wei , Tao Zhong , Yu Wen Zheng , Zhu Ying
Published: August 2013

the new containment system for steel structure of calcium silicate composite wallboard connection technology, through a lot of special experiments and research, combined with domestic and foreign research results, interior and exterior wall crack causes and treatment are discussed in this paper. Experiment shows that by adopting reasonable construction measures can effectively reduce the generation of crack, reach the purpose of heat preservation, waterproof, windproof, and sound insulation of palisade structure.
Deformation Characteristic Evaluation of Large Oil Storage Tanks under the Planar Inclined Foundation
Authors: Ji Da Wei , Wei Li Xin , Li Xiao Yan
Published: August 2013

Oil storage tank plays an important role in modern oil industry. The development of large-scale oil storage tanks has resulted in the complexity of stress distribution and deformation situation of tank wall and tank bottom. Especially in soft foundations, the tank structure is susceptible to various types of settlement deflections. The most common type is planar inclined foundation. In this paper, the finite element model of large-scale oil storage tank was built according to the pattern of design and the deformation characteristic and stress distribution of large storage tank under the planar inclined foundation was obtained. Considering the floating roof, the ultimate value of large storage tank under the planar inclined foundation is determined.
Research on Bearing Capacity Calculation of Parabolic Steel Arch Structure under Full-Span and Half-Span Loading
Authors: Jiang You Bao , Xie Ming Wu
Published: August 2013

The current Chinese design specification of steel arch structure lacks full of bearing performance when checking its in-plane stability under asymmetric load. In order to overcome this disadvantage, the nonlinear finite element method was used for the ultimate load analysis of parabolic steel arch structure under full-span and half-span loads with different combination ratio. The calculated results show that ultimate load based on the specification is close to that based on the finite element analysis of model with geometrical defects; but is quite different from that based on the finite element analysis of perfect model; when half-span load accounts for a large proportion, the ultimate load based on the finite element analysis of geometrical defect model is higher than that based on the finite element analysis of perfect model.
Research on the Stiffness of Concrete Filled Steel Tubular Column and Steel Beam Joint with Stiffening Ring
Authors: Jian Li
Published: August 2013

This paper makes research on the stiffness of CFT column and steel beam joint with inner stiffening ring by using finite element analysis (FEA) program ANSYS. Analysis result indicates that the most important factor influencing the stiffness of the joint is the height of cross-section of beam while the thickness of the web plate hardly has any influence on the stiffness. The M-θ model of the CFT joint given by this paper can be used in practical design.
Numerical Simulation of Bond Behavior for Adhesive Anchor in Steel-to-Concrete Connection Exposed to Fire
Authors: Xie Qun , Zhu Chong Ji , Ju Hao Xue
Published: August 2013

Adhesive anchor is an effective tool for a steel-to-concrete connection combined with the way of post-installed anchorage. However the bond strength of adhesive will decrease at elevated temperature which has a negative effect on anchorage behavior. In this paper a numerical analysis with 3D FE model has been carried out to investigate the tensile performance of adhesive anchor in a steel-to-concrete connection subjected to fire and the results show that high temperature have significant impact on bond strength of anchor even with the protection of fire resisting coating covering the surface of concrete base and the bond stress does not distribute along anchor length during the process of heating. The tensile strength of adhesive anchor presents a great reduction at elevated temperature compared with the strength in normal temperature.
Analysis and Test of the Inflatable Tubes of ETFE Foils
Authors: Chen Yu Feng , Chen Wu Jun , Wang Li Gang , Zhao Fei Long
Published: August 2013

In order to reveal the vibration characteristics of the inflatable tubes of ETFE foils, the modal analysis was carried out for a 2.3m long inflatable tube of ETFE Foils. The equilibrium shape of the inflatable tubes was obtained from the static calculation with geometric nonlinearity. Modes of the inflatable tubes were achieved by the Lanczos method. The effect of boundary conditions, the inflatable pressure, the elastic modulus and air added mass on the vibration characteristics was analyzed. Analysis shows that the elastic modulus and air added mass have significant effect on the natural frequencies of the cantilever inflatable tubes. First frequency of the inflatable cantilever tube is less than the inflatable tube without constrains. Inner pressure has a slight effect on deformation modes with beam bending characteristics. The numerical method based on ABAQUS finite element analysis is reliable according to a comparison between test and simulation results.
Numerical Analysis and Field Observation of Drawn Force of Sliding Pipe Method for Ultradeep Diaphragm Wall
Authors: Zhao Cun Hou , Cui Wei , Ma Bin
Published: August 2013

The magnitude of sliding pipes drawn force has important effect to quality and schedule of construction. Using concrete creep model of time dependent strength and dynamic contact algorithm, studying on the Tibet Pangduo hydro-junctions construction about ultradeep diaphragm wall with height of 150 metre, drawn force under different drawn time and hole deviation are numerically simulated, and are verified by field test. The results show that the magnitude of drawn force is affected by many factors, mainly related with contact characteristics and hole deviation between sliding pipe and concrete; with the increment of drawn time carrying forward and hole deviation, drawn force apparently increases; without hole deviation, the drawn force is about 500t after pouring to 40m.
Experimental Research of Cable in Plate Method
Authors: Pang Ping , Yin Xin Sheng
Published: August 2013

According to the research, a new arrangement method of prestressed concrete slab is provided. It has not been mentioned before and this article discussed unbonded prestressed concrete slab system, and gives the theoretical calculation method.
Stability Analysis of a New Frame Formwork Support
Authors: Nie Li Wu , Liu Zhen Hua , Han Gu Yue , Zhang Ji Gang
Published: August 2013

Considering the structural characteristics of high-rise residential with regular plane design, simple load condition and small height change of standard floor, a new frame formwork support is proposed. According to eigenvalue buckling analysis, the research proves its stability bearing capacity and mechanics properties. MF1225 bearing capacity is determined by the out-of-plane stiffness. Ledger and bottom reinforcing tube improves the longitudinal stiffness and integrity in frame system.
Research and Improvement on Feed Box for BQ220 Beam
Authors: Zhang Jian Zhong , Meng Yong Jing , Yao Zhong Fu , Liu Yuan Yuan , Xie Xin Peng
Published: August 2013

The structure of traditional light planer feed box beam is complex and it is difficult to manufacture. According to the requirement of a company, a lightweight beam feed box was designed. Both improvement of the structure and optimal design were considered and good results were got. Fixed-axis gear box was adopted. It had small volume, light weight, simple structure and low cost.
Short-Term Wind Power Prediction Based on Phase Space Reconstruction Theory
Authors: Li Zhi Gang , Li Ling Ling , Li Jun Hao , Zhang Shi Nuan
Published: August 2013

The accession of large scale wind power will impact the planning and construction, analytical control, operation of the economy, as well as power quality of the power grid. More accurate wind power prediction can help reduce the quantity of spinning reserve and provide the grid dispatching operation a reliable foundation. Wind power has chaotic characteristic. This paper proposed a method of chaotic time series prediction based on chaotic phase space reconstruction. The forecast precision depends largely on the choice of the model parameters. In order to improve the forecast precision and generalization ability of the prediction model, this article computed with the method of C-C to optimize the phase space reconstruction parameters comprehensive. Forecasting model used weighting first-order local field method. To test the approach, the data from a wind farm of Inner Mongolia were used. Practical examples showed that the integrated approach has a very good forecast precision and good practicability.
The CFD Analysis of JQ40A Gasoline Turbocharger Compressor
Authors: Liu Meng Xiang
Published: August 2013

As a core component of a turbocharger, the efficiency of compressor directly affects its overall efficiency. The finite element model and mesh model of JQ40A turbocharger impeller is built by using Software Numeca in this paper. The compressor efficiency and the flow field with different inlet blade angle, the pressure surface boundary layer with different blade thickness are simulated in the case of the same outlet angle, throat area of and number of the blades. The result of the simulation and research shows that it is the inlet blade angle of 51.40 degrees and the average blade thickness of 0.5mm that make it the best design with highest efficiency .
An Improved Gray Similarity Degree with Adaptive Weight for Guidance Simulation Credibility Evaluation
Authors: Wang Fei , Liang Xiao Geng
Published: August 2013

Credibility evaluation of guidance system simulation based on similarity degree is researched. Concerning the engineering problems that similarity degree method is faced, an improved gray similarity degree method combined with variable weight function is presented. Firstly, the ameliorated similarity degree method using for static simulation parameter is built by utilizing the gray measure function of flight data. Then, the sequences coming from dynamic simulation parameters are divided into important region and unimportant region, the un-homogeneous exponential operator as well as the mean operator is applied and the improved similarity degree method using for dynamic simulation parameter is established. Finally, the method is verified through actual measurement data. Practice proves that the improved method can give more creditable evaluation result and have a bright prospect.
Development and Implementation of a Novel Digital Shot Sensor System
Authors: Wang Wei Tian , Song Quan Jun , Nie Yu Man , Wang Bu Yun , Ren Hong Yu , Ge Yun Jian
Published: August 2013

Kinetic information acquisition of shot throwing is significant for the train of shot put athletes. This paper presents a novel sensor system based on a 9 degrees of freedom inertial measurement unit, which provides attitude information of shot throwing in real time. The sensor system is designed with modularized structure and installed in the digital shot which has almost the same size and weight as the standard shot for females. A multi-target and multi-parameter information acquisition platform is constructed to acquire kinematics information. With the help of the sensor system, the coaches can combine attitude information with kinematics data to analyze the shot throwing movements.
Modeling of CH4 Adsorption-Induced Curvature of a Nanocantilever
Authors: Li Bing , Huang Qing An
Published: August 2013

In this paper, a simulation model is proposed to describe CH4 adsorption-induced curvature of a nanocantilever, based on the energy transfer between potential energy of adsorbates and elastic energy of the bending cantilever. For most cantilever sensors, the basic structure is a silicon beam coated with a metal layer on the top, and aluminum is chosen here. Because the native oxide is usually formed during the fabrication of silicon beams, we have to describe the effect of native oxide on the elastic modulus of the silicon nanobeam in this model based on the semi-continuum method. This model gives a way to predict the curvature of the composite cantilever with native oxide when adsorbing a single layer of CH4 molecules.
Computer Simulation Analysis of Microchannel for a Continuous-Flow PCR Chip
Authors: Young Chao Wang , Lien Cheng Chang , Ay Chyung , Pan Pao Chia
Published: August 2013

The purpose of this study is to analyze the model of a continuous-flow Polymerase Chain Reaction (PCR) chip with CoventorWare software. It offered the ability of fast heating and cooling rate when the DNA duplication process happened. The main idea was to compare the effects of different cross sections of channel and find out the better one for heat transfer.
The Application Design of Inductance Sensor in Active Magnetic Bearing
Authors: Yu Wen Tao , Li Hong Wei , Liu Shu Qin , Zhang Yun Peng
Published: August 2013

The sensor is an important part of the active magnetic bearing system, which directly affects the performance of the entire system. Compared with the eddy current sensor, inductive sensor has the advantages of low cost, high sensitivity, and is not sensitive to the electromagnetic environment; Influenced by the ambient temperature is small. In this paper, design research from two aspects of the sensor structure and circuit, and the sensor was tested and successfully used in maglev blower. This sensor design method can also be applied on other active magnetic bearings, such as magnetic levitation heart pumps, etc.
Calculation and Simulation Azimuth Hydrostatic Thrust Bearing of a Large Alt-Azimuth Telescope
Authors: Huang Long , Ma Wen Li , Huang Jin Long
Published: August 2013

The use of hydrostatic bearing for support of telescope offers a number of potential performance advantages, but the structure parameter of bearing is the main factor which influence the bearing. The temperature rise of bearing is also important for the stiffnees of the telescope mount.In addition to the known benefit of mount stiffness and tracking accuracy from exceedingly low friction, the hydrostatic bearing provides a wide range of geometric possibilities for large telescopes [1].This paper analyzes various familiar hydrostatic bearing for the azimuth and elevation axes of telescope.Theoretical calculation and simulation show that the performance of bearing meets telescope’s design requirements.The principle and process of this work and Finite Element Analysis (FEA) are introduced in detail. According to the CFX result, the structure parameter and performance of bearing ,temperature field and pressure distribution have obtained.
Design and Optimization of the X Direction Sideway Face Camber Curve of Super-Span Cross-Rail
Authors: Cai Li Gang , Wang Zhi Liang , Guo Tie Neng
Published: August 2013

As super-span cross-rail of NC heavy-duty planer type milling machine tool has a super span and heavy mass,it will deform seriously after installed. Machining an arch camber on X direction sideway in advance is used to compensate for influence caused by its deformation.Finite-element method is used to analysis deformation of super-span cross-rail when working.Multinomial is used to fit deformation curve based on deformation of the X direction sideway of cross-rail when bottom-slide and ram at each position.At the same time this paper takes into consideration of the impact on camber curve as the bottom-slides span brings about 2 deformation curves.A method based on 2 deformation curves is put forward to design and optimize the camber curve. By comparing various camber curves effect on the deformation of milling head,this article proves that the optimization method can effectively reduce the influence of cross-rails deformation on machine tools accuracy.
Research on Shape Signal Smoothing Processing of Cold Rolling Strip
Authors: Yang Li Po , Yu Bing Qiang
Published: August 2013

In the process of measuring the shape of the cold rolling strip, by combining proportion compensation with slope compensation, the signal error of edge shape should be compensated reasonably. In addition, corresponding solutions are proposed to solve the channel signal loss or the discontinuous transverse shape value which takes place occasionally in the shape measuring roller. These solutions could improve the stability of shape measuring signal, avoid serious accidents of controlling mill caused by abnormal shape signals and achieve reliable shape control without worries
Robot Flocking Control with Part Information of the Virtual Leader
Authors: Peng Huan Xin , Liu Bin , Xu De Hong
Published: August 2013

Under virtual leader-follower model, when all robots can receive the information of the virtual leader, the robot flocking algorithm can avoid diverging. For time-delay, noise and network congestion in the communication, in the fact, only part robots can receive the information of the virtual leader. In the paper, we analyze the performance of robot flocking control algorithm with part information of the virtual leader. We analyze the impact brought by the parameters on the robot flocking control when only part robots can receive the information of the virtual leader, and simulations are done. Results show that the performance of distributed robot flocking algorithm depends on the probability of robot receiving the information of the virtual leader, the communication radius among robots, and density of robot and so on.
Design of Broadband, High-Speed Dual-Modulus Prescaler for Multi-Mode PLL Frequency Synthesizer
Authors: Jiang Xue Fei , Fan Xiang Ning
Published: August 2013

A architecture of multi-mode PLL frequency synthesizer one can meet a variety of communication standards is presented in this paper, which can provide each mode with the required frequency, while reducing the system's hardware cost. Optimized broadband high-speed dual-mode prescaler (DMP)'s internal structure, the principle of circuit design and its layout is introduced. The DMP is produced by 0.18μm CMOS technology. The post simulation results show that with the 1.8V power, the DMP's operating frequency range is 0.4 ~ 9.6GHz, the power consumption is 7.6mA.
A 1V Low Voltage 4GHz Phase-Switching Dual-Modulus Prescaler in 0.18μm CMOS
Authors: Yuan Liang , Fan Xiang Ning
Published: August 2013

A 1V low-voltage phase switching dual-modulus prescaler in standard 0.18μm TSMC RF CMOS technology is presented. Forward phase switching technique is used to prevent glitches. Low threshold voltage transistors are applied to overcome low voltage supply. Circuit techniques are used to improve driving ability and ensure reliability. The post simulation results show the prescaler operates correctly from 0.8GHz to 4GHz with power dissipation of 2.059mW at a maximum input frequency of 4GHz from 1V power supply.
Mathematical Model Establishment of Prefabricated Hole Flange-Forming of Unequal Diameter Tee Pipe
Authors: Wang Zhong Lei , Li Zhao Dong , Zhang Xin Kai
Published: August 2013

Based on the principle that in the deformation zone the length of bore plain wire does not change, a mathematical model of the prefabricated hole flange-forming of unequal diameter tee pipe is established, for the difficult problem of the flange-forming prefabricated hole size design for tee pipe. To solve the mathematical model, a numerical method and a software system for The solution of the mathematical model is established. In order to verify the reliability of this article to build the mathematical model and its solution, taking engineering for example, apply the method of finite element simulation to verify the mathematical model and the solving system, and the results show that the mathematical model constructed in this paper can relatively accurately make calculation of prefabricated hole size of flange-forming of unequal diameter tee pipe.
Testing Study on Surface Grinding of Post-High-Temperature Granite
Authors: Yang Jin Guo , Zhao Zi Yu , Zhang Su Zhi
Published: August 2013

For hard, brittle and difficult-to-cut materials, the technology heating auxiliary grinding has a significant role in improving productivity and reducing costs. Using different thermal loads and different ways of cooling to load granite,we carried out surface grinding experiments. We tested and analyzed variation of the grinding force and specific grinding energy. The results showed that strengthening the thermal load continuously, the grinding force and specific grinding energy reduce. This phenomenon significantly improves grinding efficiency and reduces the wear of wheel. Studies have shown that the auxiliary heating has an important contribution to enhance the production capacity of the stone processing.
Research on Stretching Efficiency of Heavy Forged Shaft Based on Orthogonal Experimental Design
Authors: Xia Qin Xiang , Xiao Gang Feng , Huo Yu Lin , Song A Sheng
Published: August 2013

During stretching of heavy forged shafts, there are three major factors that affect the stretching efficiency, including the rotation mode, anvil gap and feed length. Based on the research of model simplification, successive blows and rotation control, a reasonable finite element simulation model is established by the numerical simulation software Deform-3D. The effect of the three factors on stretching efficiency is analyzed by numerical simulation and orthogonal experiment. The results show that the effect of the rotation mode on stretching efficiency is the maximum, and the effect of the feed length is the minimum.
Experimental and Simulation Research on Stamping Formability of Hot-Dip Galvanized Sheet
Authors: Wang Lei Gang , Zhou Ting , Huang Yao
Published: August 2013

When stamping galvanized sheet, the formability usually decreases for failure of zinc coating. In this paper, formability of galvanized sheet was firstly researched by Erichsen experiment. The results show that zinc coating has lost efficacy when the cup arrives the value of Erichsen depth (ED). Then finite element analysis was used, it puts the zinc coating and the substrate in connection by using automatic-surface-to-surface-tiebreak and sets up a series of forming limitation diagrams (FLD) of galvanized sheet and of zinc coating under different punch strokes. Then depth of the cup when zinc coating reaches critical state was got, which decreased about 5%-10% compared with bare sheet. At last, failure mechanism of zinc coating was discussed, the reason is that material of zinc coating is soft and the friction leads to pulverization and exfoliation of zinc coating. The simulation results are consistent with the Erichsen experiment ones. Conclusions of this paper can provide theoretical guidance for the stamping process design of galvanized sheet.
Numerical Analysis of Irradiation Effects on Metal Materials of Fusion Reactor
Authors: Liu Fan , Zhang Ling
Published: August 2013

The first wall material in a nuclear fusion reactor endures a series of complex processes, resulting in irradiation damage of its structural materials and eventually questioning its operative safety. Experimental and computer simulation are currently applied to search for irradiation damage. We used, the Material Studio software to model and calculate the crystal structure and mechanical properties, and the CASTEP module, primitive cell of iron, Fe-Cr alloy and Fe-Cr alloy with defects to calculate, analyze, and obtain the values of elastic constants and Young’s modulus. Our results showed that addition of Cr atom to conventional first wall metal materials of nuclear reactor, enhanced endurance by increasing the values of elastic constant and Young’s modulus, but distorted the symmetry of the crystal structure. We preliminarily prove and predict the possibility of the changes of mechanical properties of Low-activation martensite/ferrite under irradiation effects.
Non-Equilibrium Statistical Theory of Void Microstructure Evolution in Irradiated Metals
Authors: Guo Xiang Hui , Hu Hai Yun
Published: August 2013

The non-equilibrium statistical theory was used as a theoretical approach to modeling and predicting void evolution in metal materials. Fokker-Plank equation was introduced as the kinetic equation for the void evolution, from which the probability density distribution function of voids could be obtained. From the micro-mechanism of metal's irradiation damage, void growth rate equation was obtained using spherical Weilv model and control diffusion theory, and then was simplified based on appropriate assumptions. According to the probability density distribution function of void, a series of macro-mechanical characteristics caused by void growth can be calculated, such as: the critical radius of the void nucleation, the average radius of void. Thus the correlation between the void microstructure evolution and the macroscopic properties of metals can be achieved.
Preparation of Waterborne Epoxy Resin Emulsion
Authors: Hao Ran Zhou , Yun Fei Yang , Xiao Jiao Liu
Published: August 2013

The hydrophilic carboxylic group was induced into the main chain of the bisphenol-A-type epoxy resin via alcoholysis reaction between the maleic anhydride and he secondary hydroxyl group of the bisphenol-A-type epoxy resin. Then a self-emulsifying type aqueous epoxy resin was developed. The chemical structure of the resultant was analyzed by FT-IR. The effects of temperature, time, ratio of reactants and neutralization temperature on the reaction were discussed. Then the optimum reaction condition was determined through orthogonal experiment design. The synthesized waterborne epoxy resin has favorable stability and water-dispersion.