bluuebunny/crossref_metadata_2025 huggingface dataset:
Optimizing Product Development Projects Based on the Clustered Product Design Structure Matrix (DSM)
Authors: Yang Qing , Tang Er Ling
Published: January 2014

In order to integrate the process structure with the product structure in product development (PD) projects, this paper proposes a quantitative model for measuring the dependency strength between activities based on the dependency relationship in the product Design Structure Matrix (DSM). Utilizing the quantitative model and the Multi-Domain Matrix (MDM) between process and product domain, the corresponding process DSM is obtained. Furthermore, this paper presents a sequencing optimization method for the process DSM based on rework probability DSM matrix and rework impact DSM matrix and a clustering method for the product DSM. An example is provided to illustrate the utility of the models. The optimization results yield several managerial insights, including: optimize product components and activities simultaneously, how product structure impact on PD process structure and its schedule.
Research of Reinforce Stress on the Pressure Structure of Submersible Vehicle
Authors: Chu Guan Nan , Zhang Qing Yong , Lu Guo Chun
Published: January 2014

In order to improve the load-carrying properties of pressure structure, a new method to improve the external bearing limit is put forward and residual stress is used. Based on finite element analysis, finite element models of cylinder pressure structure of submersible vehicle are established to produce hoop residual stress in the process of outward expansion. According to a lot of data of simulation experiments, the result indicates that hoop residual stress is compressive on the outer surface of the pipe and the hoop stress keeps tensile on the inside surface. This kind of stress distribution is helpful to the cylinder structure and can improve its bearing capacity of external pressure. Moreover, the rules of the residual stress are got. The influences of physical dimension, yield strength of material and the expansion rate to the stress distribution are analyzed. The measures to produce the stress distribution are also presented.
Study on Structural Analysis for One-Cylinder Vertical Engine Assembly by FEA Method
Authors: Wang Yong
Published: January 2014

In this paper, a simulation driven design approach was employed for the design process of the structural components of the one-cylinder vertical Engine. Finite element analysis (FEA) of the one-cylinder vertical engine assembly has been completed for assembly and maximum pressure loads using FEA software.
Dynamic Response of Elastic Beam to a Moving Pulse: A Theoretical Study on Critical Velocity
Authors: Qian Chun Qiang , Zheng Zhi Jun , Yu Ji Lin
Published: January 2014

Dynamic behavior of a semi-infinite elastic beam to a moving single sinusoidal pulse was theoretical investigated. An analytical model was developed based on the Bernoulli-Euler beam theory. The solutions of the deflection and stress of beam were obtained by using the superposition principle and applying the techniques of Fourier transform. It is found that when the moving pulse reaches a critical velocity for a given moving pulse duration, the maximal absolute value of stress in beam attains its maximum value.
Design of Transient Electromagnetic Transmitter Based on FPGA
Authors: Zhang Lei , Duan Qing Ming , Sun Hao , Huang Ting Zhe , Shi Jun Wei , Wu Da , Han Ying Jie
Published: January 2014

Transient electromagnetic transmitter is a part of the transient electromagnetic detection system. In the aspect of short turn-off time for high-power current, there are still many problems to be solved urgently. This paper put forward a design scheme of transient electromagnetic transmitter, amplified the control signal with triode, and put forward a kind of passive constant voltage clamping absorbing circuit, which made the turn-off time shorter and the linearity of the emission currents lagging edge higher. This transient electromagnetic transmitter system is portable and easy to operate. Through experiments we can prove that the transmitter has the characteristic of short turn-off time and high reliability, and it has reached the requirements of field application.
Design and Validation of Sensor Balance for Propeller Experiment
Authors: Jiao Jun , Song Bi Feng , Zhang Yu Gang
Published: January 2014

This paper proposes a new two-component sensor balance to measure the thrust and torque of the propeller. Its principles of measuring force were derived and the procedures of balance measuring system were also provided according to the virtual instruments. The sensor balance was calibrated through the ground static calibration bench to verify its accuracy. And a ground static thrust experiment on a one-meter sized propeller model was carried out. By comparison, the experimental results of adopting the designed sensor balance basically tally with those of wind tunnel experiment, which proves that this sensor balance can be used in propeller experiments.
Design and Analysis of a Novel Mini-Type Centrifugal Friction Speed Limiter
Authors: Xie Zheng , Liu Guan Yang , Wang Yan , Liu Yuan Qi
Published: January 2014

In this paper, a novel compact and light weight mechanical centrifugal friction speed limiter is designed for the miniaturization of mechanical systems. Details of design concerns are described. On this basis, complete and accurate mechanical model is established. Dynamic and steady-state analyses are also carried out. Moreover, it is proved that the performance of speed limiting has nothing to do with the gravity of centrifugal part. Finally, the theoretical model is verified by Adams software simulation under working conditions.
The Optimization Design of Combination Sleeve Based on ANSYS
Authors: Gao Yao Dong , Li Wei , Wang Huan Yu
Published: January 2014

The limitations of traditional methods of the optimization design of combination sleeve are pointed out in this paper. The features and steps of the optimization design by using ANSYS are introduced. The steps and features of applying ANSYS to optimize the combination sleeve are introduced detailed with an example, and the solution to the key problem is introduced. The method has a high value for application and promotion.
Study on the Performance of Water Lubricated Stern Tube Bearing Based on Fluent
Authors: Liu Jiao , Liu Zheng Lin , Meng Xiang Kun , Liang Xing Xin
Published: January 2014

Apply FLUENT software to establish the water lubricated rubber stern tube bearing CFD model,study temperature and pressure distribution of the bearings at different speeds of rotation. It plays an important role in improving the performance of ship water lubricated stern tube bearing and security, reliability of propulsion system. The simulation results show that increasing the shaft speed in a certain range can reduce water film temperature, the effect is obvious especially at slow entrance velocity of bearings. Both high and low pressure ranges in the middle of bearings are enlarged with the increase of speed.
Modification of Epoxy Resin by Reactive Block Copolymer SEBSMB
Authors: Zhou Jian Ping , Wu Hui Ru , Fu Wan Li , Jia Shi Jun
Published: January 2014

Reactive block copolymer SEBSMB was used as modifier to toughen epoxy resin. The results indicate that ideal enhancement of toughness could be achieved by this method. The impact strength increases with increase of the content of SEBSMB in the matrix and it could be enhanced by 200% at 20wt% addition of the modifier. DMA and TG results show that the modified resin exhibits similar thermal stability as compared with pure epoxy resin. The toughening effect may be ascribed to the unique self-assembling structure of SEBSMB in the matrix and a hypothetical model was proposed.
A Novel Simplified Distributor Model of Fluidized Bed Based on the Porous Media Theory
Authors: Li Bin , Liu Wei , Kong Xiang Wei , Zhang Shuang Tian
Published: January 2014

The distributor is a key component of the gas-solid fluidized bed. It must be guaranteed that the gas has enough stability of pressure drop. In this paper, numerical simulation is used to study characteristics of the distributor pressure drop. The coefficients of viscous loss and inertial loss which describe the porous media model is obtained from the numerical simulation results. Based on the porous media theory, a new simplified equivalent model is proposed, and it can achieve better gas distribution and form uniform pressure chamber. Simulation is also carried out to compare the pressure drop between the distributor model and porous media model. The relative error is only 1.16% in the simulation of this paper, which proves the feasibility of the novel model.
Optimal Design of a Four-Legged Walking Mechanism Based on Bionics
Authors: Cai Wei Guo , Shang Zhen Guo , Wu Li Bo
Published: January 2014

According to the present research situation on walking robot, a four-legged walking mechanism based on bionics is presented. The mathematic model of single leg is built in accordance with the projected path. The single leg is divided into driving parts and leg parts. The motion orbits of combined point are optimized using the mathematic model, and the motion character is analyzed according to this mathematical model. The results show the whole mechanism can accomplish the scheduled purpose, the velocity and acceleration of mechanism are reasonable; the trotting pace can also complete the motion simulation. It provides the theoretical basis and reference experience for foot type walking mechanism.
Analysis for Initial Status Parameters of Parachute Aircraft
Authors: Zhao Ji , Li Jie , Liu Chang , Li Bing
Published: January 2014

Transformation from bullet to aircraft is the key technology for parachute aircraft. The transformation occurs at the end of initial bullet trajectory, so the simulation of trajectory can help us to analysis the affect factors. Contrast with tradition trajectory, the initial trajectory of parachute aircraft contains three phases: launch inside trajectory, free-control trajectory and parachuting trajectory. This work adds parachuting model into tradition trajectory model, and built simulation model on computer. Furthermore, to confirm the effect from parachute area and time of unfolding parachute, analysis for falling speed and time of stability (attack angle and roll) are made, and then the relates among these factors are summarized.
Research on the Effects of Tires on the Vehicle Handling
Authors: Chen Huang Ming , Guo Kong Hui
Published: January 2014

It is very important for vehicle handling to match right tires. Mechanics characteristic test is done for the different type tire, the mathematical model is set up according to test data. A dynamic model of vehicle is set up to study the effect of tire performance to vehicle handling stability. Vehicle dynamic response is researched on sinusoidal input of the steering wheel angle. Linear fitting of vehicle dynamic response is done in linear region. According to the difference between the simulation value and linear fitting, different tires are rated.
Mechanical Design and Analysis of a Tracked Mobile System for Patrol Robot
Authors: Cui Jiu Qiang , Zhang Zhen , Zhao Rui Feng
Published: January 2014

Patrol robots can be applied in many fields, such as accident prevention and Troubleshooting. In this paper, we introduce mechanical design and analysis of a tracked mobile system for patrol robot which solves the occupation problem of motor and gear box in traditional tracked mobile system. The structure of the tracked mobile system includes sprocket constructed by the wheel motor, closed track chain which is meshing with the sprocket and the idler and also hinged by track shoes and high intensity pins. Finally, finite element analysis is carried out on several key components to verify the rationality of the design.
Study on the Suck Rod Design and Evaluation
Authors: Zhang Man Lai , Liao Rui Quan , Qin Zhang , Yao Pu Yong , Dong Ze Chang
Published: January 2014

In order to satisfy the design and application requirements of the suck rod in the suck rod system, the method of design and evaluation for the multistage suck rod is studied. Through the coupling calculation of rod load and the reasonable centralizer spacing, the friction force and contact position between the centralizer and tubing are determined, and the analysis system for the multistage suck rod design and evaluation is established on the basis of well track for the equal strength design and stress comparative analysis. With the analysis system, a fast and effective tool is provided for the reasonable design and evaluation of suck rod to improve the service life of suck rod.
The Design & Calculation for Hydraulic Cylinder of a Special Machine for Heat Exchanger Tube Bundle Drawing and Assembling
Authors: Yang Ke , Guan Shang Jun , Wang Xiang Dong
Published: January 2014

Heat exchanger tube bundle drawing and assembling machine is special equipment for maintenance of heat exchanger of petroleum, chemical and other enterprises, specifically for removal and installation of the heat exchanger tube bundle. This paper introduces a self-developed heat exchanger tube bundle drawing and assembling machine’s overall structure, driving principle, hydraulic system and the design of hydraulic cylinder, which has ensured the safety and reliability of a Special machine for Heat exchanger tube bundle drawing and assembling.
Based on the Gradient Source Representation of Functionally Gradient Materials
Authors: Li Qiang , Wu Ming Qing
Published: January 2014

In the process of functionally gradient material entity modeling, in order to meet the design requirements, one needs to constantly change coefficient of material composition equation. In order to facilitate visual design of functionally graded material entities within the distribution, the method based on gradient material source be adopted to directly change the coefficient of material composition functions, and according to the coefficient of material composition equation function image to choose material composition functions. Homogenous approaching gradient is used, the feasibility of change of gradient direction transformatio is proved.
CNC Lathe Drive System Design
Authors: Wu Ming Qing , Li Qiang
Published: January 2014

According to some of the original data on the machine lathe develop some parameters, according to the proposed parameters, transmission scheme compared to determine the transmission scheme. Calculate the transmission ratio of the transmission and gears vice parameters, and the gear and shaft strength, stiffness checked.
Hydroscopicity and Dielectric Properties of Polyimide Containing Biphenyl and Bis-Benzimidazole Rings
Authors: Chen Ying Tao , Lu Hong Xu , Zhang Qing Hua
Published: January 2014

A kind of Polyimide films (PI films) containing biphenyl and bis-benzimidazole rings were prepared from the its precursor Polyamic acid (PAA) solution synthesized by aromatic diamine containing biphenyl and bis-benzimidazole rings with different commercial aromatic dianhydrides. The PI films exhibited excellent hydrophobicity with the contact angle of higher than 90o and the hydroscopicity are lower than 1%. The PI films also have great dielectric properties of the dielectric constant ranges from 2.10 to 2.94 under the voltage frequency within 1 to 106HZ.
The Design of a Small Composting System and Turning Device
Authors: Wang Tan , Xin Hong Bing , Xue Zi Yun , Li Quan Lai , Cui Deng Qi , Liu Long , Xin Yue Fei
Published: January 2014

This paper introduces the basic principle, the compost system design requirements, and to introduce biodegradable composting system and design. At the same time design the structure and layout of a small biodegradable compost pool. Base on introducing the small turning device to complete a small spiral turning device of the mechanical system design.
A Height Adjustable Tool Holder
Authors: Ma Ting Hui
Published: January 2014

In ordinary lathe turning workpiece before, must first adjust the turning tool nose aim at spindle centre. But in the real machining cutter bar itself due to different specifications, you need to add the shims in the cutter bar below to adjust the height to meet the lathe tool nose alignment chuck center. But this traditional method often turning tool itself reduced rigidity, affected by the roughness of the machined surface, in order to solve this problem, this paper will newly design to reasonable of turning tool holder, make the turning tool holder height according to the requirements of the upper and lower adjustment, solve the insufficient rigidity of turning tool, workpiece surface roughness difference, eating tool, tooth type angle is not accurate and other issues, the following discussion is made on the structure design. Context Development is important, on the basis of ensuring processing quality, improve productivity, existing equipment, is now as the industry is the rapid development of China's urgent need to solve the problem, in order to make a country really strong, must be developed industrial base, in the machining of this big family, Especially ordinary lathe, but a high quality processing lathe and process parameters is the total goal of development of manufacturing industry. As the machine tool operator is the first to consider how to improve the existing machine, the machine speed, reduce the processing time, reduce the auxiliary time, to improve production efficiency, and as the main auxiliary components-lathe tool holder, should also continue to improve and perfect its function. Although the lathe tool holder has emerged many improvements, but also part of the failure to meet, but these are temporary, so we must spend considerable to devote themselves to the improvement of equipment, this article tells about a scheme of ordinary lathe tool holder with improved.
Identification of the Lumped Parameters for Hydraulic Bushing Based on FSI Finite Element Simulation
Authors: Li Lin , Liu Xiao Nan , Feng Xiao Lin
Published: January 2014

Radial damping hydraulic bushing is the object of this study, which is widely used as vibration isolator in the vehicle chassis system. The lumped parameter (LP) model for hydro-bushing is usually applied to the dynamic characteristic analyses. Two-way fluid-structure interaction FEA (nonlinear finite element analysis) technique is used to identify the main parameters of the LP model. The method proposed in this paper can ensure high quality and low cost in hydraulic bushing development.
Cooling-Performance Estimation of the Composite-Graphite Heat Sink with Annular Conductive Base for LED Lamp
Authors: Li Feng , Jeng Tzer Ming , Tzeng Sheng Chung , Cheng Po Tsun
Published: January 2014

This work experimentally investigated the material effect of heat sinks of LED lamps on the heat transfer and illumination characteristics under the free-convection condition. The experimental results indicated that the heat-transfer capacity of the pure aluminum-alloy heat sink was better than those of the composite-graphite heat sinks. However, the cost and weight of the composite-graphite heat sinks were reduced much more by comparing with those of the pure aluminum-alloy heat sink. Besides, the illuminations of these test heat sinks were similar after 2000-hour lighting continuously. Therefore, the composite-graphite heat sink is useful for the cooling of the LED lamp and the electric equipment. It has large potential in the relevant markets.
Studies on the Prediction of Landing Impact for Airborne Vehicle
Authors: Li Jian Yang , Wang Hong Yan , Rui Qiang , Hong Huang Jie
Published: January 2014

The airborne vehicle would suffer from impact at landing, the impact load is one of the most important indexes for the security of vehicle. There was a little statistical test data of landing impact load, but it was not enough for researching on the relationship between landing condition and impact load. This paper describes the application of new technology for the prediction of landing impact under stochastic conditions. Based on the Finite Element method, Response Surface Model and Monte Carlo method, the statistical method for landing impact load under stochastic landing conditions was proposed. The results would provide the boundary conditions for the design of vehicle and provide the evaluative terms for landing security.
Equipment Design for Supercritical Cleavage Technology
Authors: Zhou Cheng Hong , Bai Yang , Hu Ming Feng
Published: January 2014

Thin film is a class of materials forming bonds in two dimensional plane, and graphene is the most famous among thin film. Layered crystal is the natural macroscopical collection stacked by thin film and thin film is usually obtained by exfoliating layered crystal. In practice, it is feasible to exfoliate thin film similar to graphene from layered crystal via supercritical cleavage. As supercritical fluid can diffuse into the interlayer space of layered crystal easily, once reduce the pressure of the supercritical system fast, supercritical fluid between layers expands and escapes form interlayer, consequently exfoliating layered crystal into few-layer structure. As the supercritical condition is almost strict for most of supercritical medium, it is meaningful to design a useable reaction kettle that can work in the strict supercritical environment. In this article, the experiment equipment designed is introduced and it works well in the supercritical practical cleavage process.
Parameter Design and Simulation Research of Power System for Electric Vehicle
Authors: Wang Wen Long , Liu Wei Ze , Tao Bing Quan , Ma Jian Wei
Published: January 2014

According to the design requirement of electric vehicle, advantages and disadvantages of all kinds of drive motor, battery and drive system for electric vehicle are analyzed, the appropriate drive motor, battery and drive system are selected; parameters of power system for electric vehicle are designed using method of theory analysis, and modeling and simulation are carried out using AVL-CRUISE software, simulation results show that the design is reasonable.
Fluid Factors Research in High Pressure Abrasive Water Jet
Authors: Li Zhen , Di Wen Ting
Published: January 2014

Basisning on two-phase flow theory and using the FLUENT fluid analysis software to do numerical simulation in High pressure abrasive water jet. Changing the viscositythe flow and the density to observe the Influence in the field of force and velocity distribution. The results show that: density increases can improve the force and velocity significantly; but viscosity increase has a opposite effect, since the flow resistance increasing, making the outlet velocity fast decay. On the other hand, the flow of the working medium can also have a greater impact on the inlet velocity and jet results. An appropriate increase within the allowable range in the device can improve jet results.
Analysis of Mechanical Seal Leakage within Hydrostatic on Nuclear Reactor Coolant Pump
Authors: Zhang Hai Yang , Zhu Wei Bing , Gang Zhou
Published: January 2014

According to the fluid hydrodynamic lubrication theory, and the structural characteristics of the convergence gap seal is combined, the effect of differential pressure and centrifugal force should be considered, then the convergent wedge gap mechanical seals flow field numerical model is established and the influence of the leakage factors are researched, including the geometric parameters and operating parameters. Research has shown that the amount of leakage and the seal clearance were positively correlated. And the larger turning Angle is, the bigger correlation becomes, however, it is negatively correlated with speed and turning radius, the seal leakage is impeded by the centrifugal force and the larger turning radius is, the smaller leakage becomes.
State of Charge Estimation of Lithium-Ion Battery Using Extended Kalman Filter Based on a Comprehensive Model
Authors: Li Hao , Liu Sheng Yong , Yu Yue
Published: January 2014

The state of charge (SOC) is an important index for power battery system. To obtain its accurate value,a comprehensive equivalent circuit model that parameters change depend on SOC was estiblished in this paper by using the lithium-ion battery hybrid pulse power characteristic data. Then the Extended Kalman filter (EKF) method is applied to estimate the SOC under the working condition. Numerical simulations are conducted to verify the effectiveness of the model and the EKF method. The results show that the EKF method based on the dynamic model can satisfy the accuray requirements.
Impact-Resistant Analysis of Hinged Reinforced Concrete Beam with Composite Laminates
Authors: Yang Run Lin , Kong Jie , Zhou Juan Hua
Published: January 2014

Under the impact loads, once the key load-bearing member is damaged, it will endanger the entire building structures. Hence, it is very important to study impact-resistant performance of structural members. In order to verify effectiveness of a new composite protective device proposed in the earlier time, a reinforced concrete beam hinged at both ends was choosen as the observed object. During the process of numerical simulation, the four different protective measures including the unprotected, the rigid, the flexible and the composite one were considered in sequence. Numerical results show that the proposed composite measure can achieve the best protective effect, and it may be considered as a new option for impact-resistant protection of structural memebers.
The Mechanic Analysis and Construction Method on Damaged Beam of External Prestressing Reinforcement
Authors: Gao Jian Hua
Published: January 2014

In order to investigate the feasibility of reinforcement transformation schemes for actual engineering, Combined with the characteristics of the project, the reinforcement transformation designs of the roof beams is carried out, three kinds of reinforcement transformation design schemes are put forward, they are carbon fiber reinforced polymer strengthening, internal prestressing strengthening and external prestressing strengthening. The external prestressing reinforcement scheme is selected after comparing. Numerical simulation analysis of the reinforcement system is done by ANSYS software, and nonlinear finite element model of simply supported beam with crack is built, through analysis deformation, cracks and stress distribution of reinforced beam are obtained. The results show that the using function of beam is improved obviously. The rationality and feasibility of this reinforcement scheme is validated. These can provide references for reinforcement transformation of similar existing buildings.
Analysis & Research on the Parameter Sensitivity to Bearing Capacity of Autocrane Operation Site
Authors: Cheng Hong Jie , Zhao Yuan , Gao Qin He
Published: January 2014

Autocrane has strict requirement for the bearing capacity of operation site during the process of lifting and transferring. To evaluate the intensity stability of operation site, the detailed analysis to ultimate bearing capacity of operation site must be carried out and find out the sensitivity factors which influencing the bearing capacity of operation site. In this paper, based on the analysis of computation pattern of ground bearing capacity, the ultimate bearing capacity is deduced through considering the shearing strength of superstratum under circular load ground. Simultaneously, based on single factor sensitivity analysis method, the sensitivity expression of cohesion force, internal friction angle and superstratum thickness to limiting bearing capacity is analyzed and calculated, and the influence regularities of the ultimate bearing capacity of operation site, due to the sensitive parameters, is discussed.
Structural Reliability Analysis Using Legendre Orthogonal Neural Network Method
Authors: Sha Li Rong , Shi Yong Chun
Published: January 2014

In order to predict the failure probability of a complicated structure, the structural responses usually need to be estimated by a numerical analysis such as finite element method. The response surface method could be used to reduce the computational effort required for reliability analysis when the performance functions are implicit. However the conventional response surface method is time-consuming or cumbersome if the number of random variables is large. This paper presents a Legendre orthogonal neural network (LONN)-based response surface method to predict the reliability of a structure. In this method, the relationship between the random variables and structural responses is established by a LONN model. Then the LONN model is connected to a reliability method, i.e. first-order reliability methods (FORM) to predict the failure probability of the structure. Numerical example has shown that the proposed approach is applicable to structural reliability analysis involving implicit performance functions.
Comparing Tests on the Durability of Concrete after Long-Term Immersion in Different Salt Solution
Authors: Su Xiao Ping , Zhang Li
Published: January 2014

The western region of Jilin province is one of the areas with the most serious saline soil, which is the type of inland soda salt. In order to study the damage law of concrete under the condition of long-term erosion by the soluble salts in saline soil or groundwater or saturated salt water, three groups of salt solution, Na2SO4, NaCl, NaHCO3 solution, were made according to the content of soluble salts in saline soil of Daan city in spring, and water was as a comparison. The comparing tests of long-term immersion were conducted on the normal concrete specimens with the size of 40mm×40mm×160mm. The results show that there is little change on the appearance, mass and dynamic elastic modulus of concrete soaked in water. But for the concrete soaked in salt solution, the loss rate of mass changes from reduction to growth, the relative dynamic elastic modulus of concrete grows at first and declines later. Through analysis of electron microscope scanning, energy spectrum and chemical composition of concrete samples, concrete damage caused by salts includes chemical erosion and salt crystallization damage. Na2SO4 mainly influences the dynamic elastic modulus of concrete, NaCl mainly influences the mass of concrete due to its strong penetration, while NaHCO3, ranking between the two salts above, largely influences not only the mass of concrete, but also the dynamic elastic modulus of concrete.
Theoretical Study on Space Coupling Free Vibration Analysis of Self-Anchored Cable-Stayed Suspension Bridge
Authors: Feng Miao
Published: January 2014

Based on Large-displacement Non-linear Elastic Generalized Variational Principle, coupling effect of axial and flexural action, shearing strain energy, torsional strain energy of stiffening girder were considered, the large-displacement incomplete generalized potential energy functional of space coupling free vibration of a three-span self-anchored cable-stayed suspension bridge was presented. By constraint variation, fundamental differential equations of vertical flexural vibration, lateral flexural vibration, longitudinal vibration and torisional vibration were formulated, also presented the equations for the main tower with respect to longitudinal and lateral vibration. The linear free vibration differential equation was obtained when the nonlinear items were discarded. This approach provides theoretical basis for analysis of natural vibration character of self-anchored cable-stayed suspension bridges.
Research on the Developing Process and the Types of Bridges
Authors: Zhang Zhi Jun
Published: January 2014

A bridge is a structure built to span physical obstacles such as a body of water, valley, or road, for the purpose of providing passage over the obstacle. There are many different designs that all serve unique purposes and apply to different situations. Designs of bridges vary depending on the function of the bridge, the nature of the terrain where the bridge is constructed and anchored, the material used to make it, and the funds available to build it. Bridges can be categorized in several different ways. Common categories include the type of structural elements used, by what they carry, whether they are fixed or movable, and by the materials used.
Analysis of Pylon Anchorage Zone of Cable-Stayed Bridge
Authors: Zhai Liang Liang
Published: January 2014

For long-span cable-stayed bridge, the stress of pylon anchorage zone is complex. For the construction technology personnel, the research on the force characteristics of anchorage zone can offer a theoretical base to organize construction better. This paper makes a further study for the stress of tower anchorage zone of two cable-stayed bridges with different anchor forms by using major general finite element program ANSYS to analysis the force characteristics of anchorage zone in detail. The results provide a reference for construct and design the same type structure. The analysis method for same type structure is also worth learning.
Study on Detection Method of Bridge Structure Based on Quasi-Static Test
Authors: Feng Chun Heng , Gao Yan , Jin Xi Sha , Shi Xing Na
Published: January 2014

Currently the bridge structure detections are mainly based on static load test and dynamic load test. The static load test has shortcomings of less test data, long time-consumption and high cost. However, the dynamic load test has the advantages of quick and convenient, its related technologies and theories are still not mature enough. To solve this problem, the detection of bridge structure based on quasi-static test is proposed in this paper. Quasi-static load is applied on the structure by moving the standard load vehicle slowly. Then create the structural finite element model and modify the model according to the measured data to make it consistent with the actual structure. The bridge actual structural mechanical properties can be acquired by conducting load test on the optimized structural finite element model. By doing this, the bridge safety could be evaluated quickly.
Study on Critical Speed of High-Speed Train Running on Bridge under Strong Crosswind
Authors: Xiang Chao Qun , Guo Wen Hua , Zhang Jia Wen
Published: January 2014

The train-bridge aerodynamic spatial model was established, and the aerodynamic coefficients of train on bridge were calculated accordingly. The method for acquiring train critical speed under crosswind was derived by the statics, the displacement bring from springs, aerodynamic force, lateral and vertical vibrational inertia force, centrifugal force and gravitational force were considered in the derivation. The results show that the head trains aerodynamic coefficient will reach peak value around wind incidence angle, the rear trains aerodynamic coefficient varies constantly with incidence angle. Side force and lift force coefficients will get maximums when train attack angle , overturning moment coefficient absolute get maximum at . For trains overturning stability, crosswind from the inner of curve blows to the head train running on the windward line of bridge is the most dangerous situation.
Solutions and Engineering Examples for Water Seepage Pollution of Retaining Wall
Authors: Pan Qin Feng
Published: January 2014

Drain hole is a important structural measure in retaining wall constructions The necessity of retaining wall drainage holes and its side effects were discussed in the paper. A solution is proposed to deal with water seepage pollution with the use of leading channel, which is demonstrated in some practical project. The project shows that dark tank to guide water is characteristiced with low cost, short construction period and reliable effect, which is worthy of reference in other similar projects.
Simulation Analysis of Simply-Supported T Beam Bridge with Continuous Slab-Deck Structure Based on ANSYS
Authors: Ling Qing Song , Tan Jun , Zhai Chuan Ming , Li Shang Guo
Published: January 2014

Based on the finite element theory and ANSYS software, the linear and nonlinear analysis were conducted on the stress situation of the continuous joint on the simply supported T beam bridge with continuous deck by applying different loads condition. The force influence factors of the deck continuous section were studied by changing parameters, and the corresponding improvement measures were put forward. The design and construction theoretical basis for the simply supported T beam bridge deck pavement were obtained and could provide reference for the related person.
Mechanical Performance and Spatial Stability under Live Load and Wind on Tied-Arch Bridge
Authors: Wang Li
Published: January 2014

Finite element model of the background tied-arch bridge was established and analyzed. Meanwhile, mechanical performance and stability of it under several kinds of simulate structural defects and damages were studied. Some typical damage and influence factors were presented in the beginning. Then, based on the finite element model, the distribution of suspender force corresponding to the simulated defects and failure was calculated respectively. At last, the first class stability safety factor under the combination load was calculated as well as the second class nonlinear stability safety factor under structural arch rib defect. Results of above calculation imply that, suspender forces gained a stronger sensitivity to vertical defect than to transverse defect. While, short suspenders were believed to be more sensitive to lineation defect than long ones according to calculation results. Additionally, secondary inner force of short suspenders was much more intensive than in long ones. The result also tells that lateral wind did bad to stability. Lift wind, contrarily, made a little positive contribution to structures in-plane stability. Simulated structural defects were supposed to aggravate the second class stability safety factor under geometric nonlinear condition.
Study on the Load Test of Ji'an Slab Bridge
Authors: Li Ming , Wang Lei , Li Zhuang , Wang Danni , Long Xing Hang , Sun Yue Long , Xiao Xiao
Published: January 2014

Ji'an Bridge is a newly built bridge. In order to understand the bearing capacity and actual working conditions of the bridge, the static and dynamic tests were carried out. This paper mainly describe the methods and principles of the load test. Through static and dynamic load test, we can detect and analyze the bridges action of stress, deflection and dynamic characteristics, then evaluate the bearing capacity of the bridge, which can provide reference for other similar bridges.
Analysis of Dynamic Characteristics of Pile-Soil Coupling Effect in Consideration of Large Span Cable-Stayed Bridge
Authors: Chen Wen Yuan
Published: January 2014

Using the viscouselastic artificial boundary, three conditions of long-span cable-stayed bridge are analyzed,such as pile cap consolidation, pile - structure and pile soil structure interaction. Natural frequency of bridge of pile - soil - structure coupling becomes small and cycle becomes long. The pile bottom reaction force decreased obviously, at the same time, the axial force , bending moment, axial force of cable, tower of axial force and bending moment is also reduced significantly. Cable-stayed bridge is a special flexible structure, so, static internal force calculation in the tower bottom consolidation pattern is safe, but the value is too large.
Construction Technology of Jiu-Jiang Yangtze River Highway Bridge
Authors: Zhang Yong Tao , Li Xin , You Xin Peng
Published: January 2014

Jiu-Jiang Yangtze River Highway Bridge, with a main span of 818m, is another long span hybrid girder cable-stayed bridge which connects Jiang Xi province and Hu Bei province in China. Steel box girder is adopted in main span and north side span, and main girder of south side span and south tower nearby is designed of concrete box girder. The pylon is concrete structure, with the height of 242.3m and H-shape. There are 216 cables used in this bridge, of which are assembled by parallel strands. Jiu-Jiang Yangtze River Highway Bridge began to construct in 2009, and was closed in December, 2012. The bridge opened to traffic officially in the next year. Design concept, construction method and vibration control measures about Jiu-Jiang Yangtze River Highway Bridge are introduced in this article.
Investigation of a Double-Arched Bridges Mechanical Behavior by the Static Load Test
Authors: Huang Hai Yun , Zhang Jun Ping
Published: January 2014

An on-site static load test of a reinforced concrete double-arch bridge with fracture is carried out, and a comparative analysis of the measured experimental results of the bridge working conditions and the calculation results of Midas/civil Finite Element Model is performed. The results show that the performance and structural deformation recoverability of the bridge is weak. The bridges overall load-bearing capacity does not satisfy its designed requirements.
Safety Assessment and Strengthening for Long Span Double-Curved Arch Bridge with Design Drawing Lost
Authors: Li Li
Published: January 2014

There are many old damaged double-curved arch bridges with design drawing lost serviced for more than 40 years are still used in West China. Based on the repair and improving the carrying capacity work of a damaged badly double-curved arch bridge whose design drawing is lost with main span of 41.0m constructed in 1962 in Sichuan province of China, health inspecting and safety assessment for this type bridge using non-destructive methods is studied. Then the strengthening design of filling concrete and enlarging the section method is proposed. High performance self-dense slight-expansion concrete and embedded bar techniques are applied in strengthening construction. After the strengthening work completed, the arch bridge is still in very good work condition experienced two devastating disasters of the 2008 Sichuan Wenchuan and the 2013 Sichuan Lushan earthquake, with the distance of bridge site to epicenter less than 100km, which proved the safety assessment and the strengthening design proposal are effective and feasible.
T-Shaped Girder Bridge Detection
Authors: Diao Yan
Published: January 2014

this article through the detection of T-shaped girder bridge, grasp the present situation of bridge structure and disease, and evaluate existing technical conditions to provide technical basis for the repair and reinforcement of the bridge in the future.
Analysis on Security Appraisa of the Existing Reinforced Concrete Bridges
Authors: Xu Shan Shan
Published: January 2014

Safety inspection of the bridge has become particularly important owing to a large number of aging bridges in China, in order to evaluate the safety of a bridge project that has been completed in Harbin, research methods of combining theoretical analysis, numerical simulation and field test is applied, response parameters changes under static and dynamic loads is studied emphatically in this paper.
Reasonable Elevation Calculation of Temporary Pier of Long-Span Steel Trussed Arch Bridges with Semi-Cantilever
Authors: Luo Xu , Cai Lu Rong
Published: January 2014

When the scaffold construction method is applied on long-span steel trussed arch bridges, reasonable setting of the temporary pier elevation has significant influence on assembly linearis and safety assembly of long-span steel trussed arch bridges with semi-cantilever. In this paper, in accordance with the manufacturing linearis steel trussed beam bridge and steel truss beam linearis changing during building process, the calculation of temporary pier elevation was studied systematically, and practical function was deduced. Then, the method was applied to a long-span steel trussed arch bridge. The obtained result by in-situ assembly and dismantling presents that: 50 mm preserved method is considered in this paper, which can provide convenience for removing the temporary pier. At the same time, the rationality and reliability of the presented approach are verified. It also can provide reference for similar bridge construction.
Identification of Elastic Modulus and Effective Pre-Stress Based on Inversion Theory
Authors: Zhang Zhao Ning
Published: January 2014

Due to vehicle load, shrinkage, creep, temperature and other factors, the strength and stiffness degenerate increasingly for the pre-stressed concrete continuous beam bridge in service. The problem, such as cracking, excessive deflection in the mid-span caused by the deterioration of the elastic modulus and pre-stress, has a direct impact on the usability, durability and security. To solve the problem mentioned above, according to the monitored deflection of the bridge in service at different time, the elastic modulus and the effective pre-stress are evaluated by establishing the inversion analysis model based on the inversion theory.
Stone Arch Bridge Disease Detection and Evaluation
Authors: Diao Yan
Published: January 2014

this article through the detection of Tong Jia Bridge, grasp the present situation of bridge structure and disease, and evaluate existing technical conditions to provide technical basis for the repair and reinforcement of the bridge in the future.
Effectiveness Evaluation on Prestressed Continuous Box Girder Bridge Strengthening with Prestressing
Authors: Zhao Xin , Xu Wan Jie
Published: January 2014

This paper presented the deterioration condition and strengthening measures of a prestressed continuous box girder bridge. Finite element model of the bridge was built and condition was assessed according to current codes. Strain and deflection were measured through loading test to assess the stiffness in-service and the carrying capacity of the strengthened bridge. The results indicate that the carrying capacity limit state and serviceability limit state of the bridge are improved.
Experimental Study of Dynamic Test Characteristics on Nanjiang Road Bridge
Authors: Zhao Jia Mei , Liu Bo , Zhang Yu Liang
Published: January 2014

Dynamic test has been carried out to completed road bridge of Nanjiang Port inTianjin. When cars were passing through the bridge, the dynamic deflections, the maximum amplitudes, the relation between amplitude and velocity, the Natural frequency and the damping ratio were gained. Dynamic modulus, vibration characteristics and crack condition of the bridge were determined so as to ascertain the reliability of the bridge.
3D Fine Modeling Method in Large and Complex Steel Truss Bridge
Authors: Jia Yi Fan , Peng Yun Dong , Jiang Hua
Published: January 2014

The design and construction of the stiffening steel truss bridge is a complex and large-scale professional program. The abstract of the plans and the weaknesses of the view angles to the design sketch will also become limitations to the owners and the decision makers. Based on the project of Baling River Bridge of large stiffening steel truss girders, this study creates a three-dimensional fine model for it via CAD, pre-assembles each parts of the bridge, and checks sections and dockings one to one correspondingly. Data conversion of this model directly generates virtual visualized model. This visualized fine model of Baling River Bridge provides decision makers with a visual analysis platform, which also offers technical guarantee and support for sensible decision makings.