bluuebunny/crossref_metadata_2025 huggingface dataset:
The Transient Flow Characteristics Analysis of Pump System
Authors: Yang Xiao Ni , Li Yong Ye , Li Ruo Fan , Sun Xi Huan
Published: August 2013

Due to the quests of technology and changes of external load, dynamical system would under non-regulative operating condition. To discuss this situation, this paper did some research about the unsteady flows in centrifugal pump by simulating test. It shows that if non-regulative operating condition emerges in the pump system, some unsteady flow which possesses transient characteristics would appear, which driven by the common disturbance from the pump and valves in this system. Besides, the transient intensity of the system under non-regulative operating condition depends on the relative intensity of the capacity and inertia. When the capacity in system dominates, it would make transient intensity weaken, but if the inertia dominates, the transient intensity would move to an opposite side.
The Flow Simulation Based on SWAT Model in Wohushan Reservoir Basin
Authors: Yang Shan Shan , Xu Zheng He , Kong Ke
Published: August 2013

In order to study the applicability of SWAT model in small and medium-sized basin, the author established SWAT model to simulate monthly runoff in Wohushan Reservoir basin. According to a lot of basic data, the spatial database and the attribute database were constructed. The entire study area was divided into 51 catchments including 126 hydrological response units. The parameters were validated by the measured data from 2007 to 2009 and calibrated from 2010 to 2011. The correlation coefficient and the Nash efficiency coefficient of monthly runoff simulation are higher than 0.70, and the relative error is lower than 15%. Considering some potential errors between the measured data and the simulated data, SWAT model can simulate the runoff process of Wohushan Reservoir basin well.
Study on Flood Control Pre-Discharge Dispatching Scheme of Reservoir Based on Fuzzy Optimum Selection
Authors: Meng Xiao , Wu Xian Bing
Published: August 2013

Flood control dispatching of reservoir belongs to the ex-ante decision. This paper established the flood pre-discharge dispatching multi-objective risk index system and fuzzy optimization model method, taking Long Men reservoir as an example, to study the design flood pre-discharge scheme for different frequency, different frequency analysis of design flood pre-discharge flow and pre-discharge time, provide the reservoir flood pre-discharge scheme of different frequency flood and provide reliable basis for reservoir flood control pre-discharge dispatching.
Study of Numerical Modeling for Reduction Rate of Porosity of Sand under Equal Amplitude Cyclic Loading
Authors: Meng Xiang Tao , Li Wang Lin , Wang Xi , Wei Xiao Yan
Published: August 2013

According to the geological conditions and operating regimes of Wang river groundwater reservoir of Laizhou in Shandong, through doing sandy one-dimensional equal amplitude circulating compression test, the effect of groundwater level repeated rising or falling on volumes of groundwater reservoir is simulated, the character of porosity changing regulation with circulating period is analyzed, the relation between reduction rate of porosity and circulating period is summarized, and the hyperbolic model of reduction rate of porosity and circulating period is constructed initially, the concept of limiting reduction rate of porosity is proposed, the physical meaning of limiting reduction rate of porosity is analyzed, modifying volumes of groundwater reservoir by limiting reduction rate of porosity is used to reflect the effect of groundwater level repeated lifting on the capacity of groundwater reservoir.
The Research Progress upon Study of Sand Wave
Authors: Li Lin , Juncheng E.
Published: August 2013

Sand waves are rhythmic patterns resulted from the interaction between water flow and sandy bed. In this paper the research progress upon the sand wave is introduced from three aspects which include theoretical analysis, numerical simulation and experimental study, based on the available literatures.
Prediction of Salinity in Qiantang Estuary Based on Wavelet Neural Network Optimized by Particle Swarm Optimization
Authors: Li Guang Hui , Sun Zhi Lin , Hu Shi Xiang
Published: August 2013

Saltwater intrusion is a serious problem for most of macro-tidal estuaries, especially when it happened at the downstream region of drinking water sources. Therefore, accurate prediction of salinity variation becomes absolutely necessary. A three-layer salinity prediction model is established in this paper, based on wavelet neural network (WNN) optimized by particle swarm optimization (PSO). The optimized model overcomes the local minimum problem and accelerates the convergence speed of WNN method. Hourly observed salinity data at Ganpu station in Qiantang Estuary was used for case study. Additionally, we compare this model with another two models, WNN and BP, by predicting the salinity at Ganpu station with the same sample. The results show that PSO-WNN model has higher convergence rate and prediction accuracy.
Dynamic Simulation of High-Pile Wharf Slab under Action of Irregular Waves
Authors: Feng Ou Yang , Fang Chen , Huang Hai Long , Zhuang Ning
Published: August 2013

The dynamic responses of single wharf slab and whole high-pile wharf structure is studied in modal analysis by 3D finite element model using software ABAQUS. According to the static force calculation module and the transient dynamics module of the ABAQUS finite element calculation, the displacement of wharf slab central point is calculated according to the effects of static force, slow variation, and the uplift pressure from both the shock and composite wave. Then the effects of wave force frequency impacting on the structure dynamic response is researched by the different high-frequency waves. These analysis results provide scientific basis and technical guidance for the high-pile wharf dynamic research in port engineering.
Recent Evolution and Future Prediction of the Delta at the Yangtze River Mouth
Authors: Li Ming , Yang Yun Ping , Li Yi Tian
Published: August 2013

In this study, an empirical curve describing the relation between erosion and deposition rate and water/sediment discharge was developed based on the recent evolution trend of the submerged delta at the Yangtze River Mouth, and the one-dimensional mathematical model for unsteady water-and sediment-transport was calibrated using the water and sediment discharge data after water impounding to predict the water and sediment discharge for the future 10 years and the future evolution of the submerged delta at the Yangtze River Mouth. The results showed that the 10 m and 20 m isobaths areas of the submerged delta changed with the water and sediment discharge from siltation to siltation slowing down to erosion. Siltation increased with large amount of rain received by the watershed during 1997-2000, while continuous retreat of erosion happened during 2000-2009. Using the one-dimensional mathematical model for river water and sediment calibrated and tested with data collected after impounding, the water and sediment discharges were calculated for Series 60 and 90, and its evolution in 2013-2022 was predicted for the delta. For Series 60, its 10 cm and 20 cm isobaths areas showed alternative scour and siltation, while the delta showed trends of erosion. For Series 90, its 10 m and 20 m isobaths showed substantial siltation in flood years. The water and sediment discharges since the Three Gorges Reservoirs was filled were lower than the calculated results for both Series 60 and 90. If the water and sediment discharges continue to decease, the delta will take an erosion trend.
Effect Analysis of Soil Improvement on Mechanical and Deformation Characteristics of Supporting Structure in Soft Area
Authors: He Zhi Yu , Fu Li , Wang Jiang Feng
Published: August 2013

Mechanical and deformation characteristics of pile-anchor retaining structure was analyzed by using numerical simulation method. The rationality of numerical model was also verified through comparing measured data in field test and numerical results. On the basis of this numerical model, Mechanical and deformation characteristics of supporting structure under the condition of different soil replacement ratio (m) was analyzed. The results show that: mechanical and deformation characteristics of supporting structure was improved by improving soil which behind retaining pile. The higher the soil replacement rate is, the effect to mechanical and deformation characteristics of supporting structure was more obvious.
Air Entraining Agent Effects Research on Concrete Performance
Authors: Li Bin , Dong Su Fen , Wen Yang
Published: August 2013

In order to improve concrete freezing-thawing resisting ability in Inner Mongolia region, adding air entraining agent is one effective measure. Because triterpenoid saponins air-entraining agent have a good applicability for local raw material, it makes concrete slump obvious increase with different water cement ratio, but the range ability first increases then decreases, the 3d, 7d and 28d compressive strength influence are the same to the slump influence, which can effectively improve concrete freezing-thawing resisting cycle times, and mixing with naphthalene series water reducing agent applies to mix small water cement concrete, and high strength grade.
A Case Study of Reinforced Self-Supported Retaining Wall (RSW)
Authors: Kim Gwang Hee , Joh Hyun Woo , Lee Young Do , Shin Yoon Seok
Published: August 2013

With increasing land prices and a lack of space in urban areas, urban construction sites are requiring deeper and larger excavations. For this reason, excavation is becoming more important. With deeper excavation, the retaining wall system needs to be adjusted, and a support system for retaining walls needs to be established so that the construction can resist the soil pressure. This can have potential problems depending on construction costs, the duration of construction, and the quality of structural frame. Therefore, the purpose of this study was to compare the conventional retaining wall system with the use of a Reinforcement Self-Supported Retaining Wall (RSW). This study revealed that the construction costs of RSW are 4 percent lower than those for the conventional retaining wall system.
Construction Technology for Improving Concrete Surface Quality
Authors: Cheng Shao Tsai , Liu I Tsen
Published: August 2013

The reinforced concrete is widely used in the current building system; there are several finishing-free concrete surface techniques for the time being, but the undesirable phenomena affecting flatness and smoothness, such as air voids, pores, honeycombs and cold joints on the completed surface often appear. For this study, the Vibration Degassing Machine (VDM) was created and patented which is used to conduct the second partial ramming modification on the interfaces between concrete and formworks that eliminates the air voids on concrete surface efficiently and reduces the pits after removing formworks to enhance the smoothness on concrete surface which ideally presents the beauty of original design.
Structure and Construction Technology of New-Type External Thermal Insulation in Outer Wall
Authors: Cui Hai Hong
Published: August 2013

There are many kinds of external wall thermal insulation, such as wire mesh, rock wool board external insulation, powder particles of polystyrene insulation slurry, and EPS exterior insulation, etc. Among all these technologies, the technology of EPS external insulation composite wall is applied more and more in China. This article aims at the research of the EPS external thermal insulation composite wall structure and the relevant construction technology.
Modern and Traditional Smart Improvements of the Traditional Tibetan Architectural Materials and Security
Authors: Hou Chao Ping , Wu Hao Rui
Published: August 2013

The Wenchuan and Yushu earthquakes damaged local Tibetan traditional buildings dramatically. With the unique geographical characteristics and religious significance of traditional Tibetan architecture, post-disaster reconstruction should inherit the local people's collective memory and create a positive, intimate space, so that the victims could envision their original homeland. Therefore, with the premise of respecting local customs and traditions, this paper argued that applying advanced disaster-resistant construction techniques and materials into building design could improve the security and stability traditional buildings, as well as highlighting its regional characteristics.
Discussion about Strength of Pre-Stressed Pipe Pile Welded Joints in Common Construction Activities
Authors: Zhou Xiao Long , Xiao Fan
Published: August 2013

In order to analyze reliability for strength of pre-stressed pipe pile welded joints in common construction activities, perform checking calculation to welded joint strength in various construction activities with the weld check formula in consideration of the influence coefficient of the eccentrically loaded end plate, compare with the shear strength of the pipe pile end plate porthole and the tensile strength of the steel bar pier head, and analyze from overall safety of pipe pile application before obtain the conclusion: the strength of the weld joint made according to relative codes is far more than the strength of the weak part of the pipe pile, but some severe weld defects will make weld joint become the first part to be damaged. One recommendation is increase the joint strength between the anchorage hole of the pipe pile end plate and the pre-stressed steel bar pier head; the other is to make the new welding construction specifications for pipe pile joint, improve requirements to joint welding construction, reduce welding duration, reduce working strength and improve welding quality stability.
Construction Technology of the New Cast-in-Place Concrete Pile with Half-Screwed
Authors: Li Xiu Hua , Gao Yan Yan , Yue Chen Xi , Wang Cheng Wu
Published: August 2013

Half-screwed pile is cylinder type in the top, and screwed at the bottom. As a new type of pile with very high practical value, its development prospect is very broad. The pile process and technical performance are analyzed generally, and advantages in application are introduced.
Study on Precision Measurement Technique for Cableway Tube of High Tower Column
Authors: Wang Deng Jie , Yan Zhong Ming
Published: August 2013

In cableway tube of cable-stayed bridge construction, the precise location and loft cableway be installation accuracy an important part of construction. How fast, accurate the cableway tube precision positioning is the key to the construction of cable-stayed bridge tower column. In this paper, the actual project as an example, Creatively put forward based on the space linear equation and the method of measuring the elevation of Resemble-leveling method, Coordinates measured coordinates with the theoretical calculation coordinates difference. Through the cableway tube naturalization adjust, coordinate difference is zero, To determine the location of the installation of cableway tube. Thereby cableway tube positioning precision and speed of construction to improve.
Construction Safety Accident Prevention Research Based on 3E Principle
Authors: Zhong Xing Run
Published: August 2013

Safety accidents occurred frequently in construction process. In order to prevent similar accidents from happening again, It is needed to conduct in-depth analysis of its reasons urgently. Accident prevention is a prior work, the relevance and effectiveness are also important. This paper analyzed the typical construction safety accidents in 2012 from the aspect of engineering, technology and education, combined the principle of accident prevention theory. This paper pointed out that to propose 3E construction safety accident prevention countermeasures from the accident prevention 3E principle can be effective in preventing the construction safety accidents.
Research on Crack Prevention Technology for Filler Wall of Concrete Block
Authors: Wang Ding Tang
Published: August 2013

The concrete block made of cement, gravel and waste residues is a new type of promotion material, but the problem of cracking existed commonly on the block wall affects seriously its use. This paper analyzes the causes of block wall cracking from the aspects of material, design, constructional measures, construction and management etc., and puts forward some corresponding precaution measures. It helps to limit or /and eliminate the block wall cracking, promote the healthy development of block, and provides valuable references for the similar engineering.
The Test Study of H-Section Steel Reaction Column Mechanical Performance in the Integral Lifting of Yuzhen Palace
Authors: Bian Zhi Hui , Qiang Wan Ming , Zhao Shi Yong , Li Shang Fei
Published: August 2013

During the Yuzhen palace of Wudang mountain integral lifting project, the writer tests the mechanical performance of H-section steel reaction column in the case of initial small eccentricity. The writer gathers and analyzes the strain data of H-section steel reaction column, including the local strain and local strength, load - displacement relationship of H-section steel reaction column in different lifting pressure. The results show that the local strain and local strength, load - displacement change present a curve of H-section steel reaction column increase trend with the lifting pressure and initial eccentricity increase. But the whole stress reaction column is in the permitted range. It could provide reference for the reaction structure choosing in the lifting engineering.
Intelligent Building Problems and Countermeasures
Authors: Chen Xiao Rong , Liu Xia
Published: August 2013

Now the overall operation of the intelligent building doesnt work as well as we expect. In this paper, we focus on design, construction and management problems of our intelligent building and put forward the corresponding countermeasures based on the analysis of these problems in order to promote a healthy development of the intelligent building.
Numerical and Physical Model Study of Tangential Vortex Dropshaft
Authors: Jia Ren Yong
Published: August 2013

Drop shafts, especially the vortex drop structure, are vertical conveyance conduits used in hydraulic engineering, water supply and drainage engineering, and so on. Because of complex flow properties and safety requirement, the system running security and reinforcement measure should be verified before it was built. In this paper, numerical and physical simulation methods were employed to verify mutually and analyze the hydraulic characteristics in a tangential vortex dropshaft. It is shown that the water carrying capacity of the dropshaft could be increased suitably and the safety freeboard of the conduit is the limiting factor. The air-water mixing at the junction may reduce the energy dissipation and reinforcement measure for the whole wall is necessary.
Spatial Analysis and 3D Simulation of Underground Pipe Network Based on ArcGIS
Authors: Wu Zheng Zhong , Liu Jun Ping , Jin Jing , Wang Hua
Published: August 2013

To resolve the problem that underground pipe network is large, complex, and difficult to manage, the management model based on ArcGIS was used. This paper aimed to transform the traditional data types of underground pipe network to a new type based on ArcGIS and to make statistical analysis and thematic maps output to the attribute datas for all underground pipes mainly including water supply network and drainage network. Through the analysis of pipe network visualization model implementation to build the spatial data model of three-dimensional pipe network, the automatic model from 2D to 3D would be achieved, then the new ways to realize the 3D visualization of urban underground pipe network would be provided. Taking the underground pipe network of a city as an example, the management system based on ArcGIS was built. The system running results show that the system could achieve the digital management of underground pipe network for the city and improve the management efficiency of the entire system.
Measures of Systematic Improving the Urban Drainage Ability
Authors: Liu Bo Yu , Yu Jiang , Li Ben Jian , Xu Xiao , Guo Rong Wang
Published: August 2013

Many cities suffered the frequent waterlogging , the paper analyed current situation of urban drainage,and discussed the problems of urban drainage and then it put forward the measures to improve the urban drainage ability.
Risk Assessment Modeling for Water Distribution Systems in Mega Cities
Authors: Sun Jia , Yu Guo Ping
Published: August 2013

In study of a series of damages to water distribution systems caused by urban land subsidence, risk assessment modeling is necessary for risk management especially in Mega-cities. First of all, the Catastrophe Theory was employed to analyze the Catastrophe mechanism, and a function catastrophe simulation model was established accordingly to get the vulnerability index of water distribution system. Secondly, risk entropy model was used to analyze the risk of pipe network suffering the land subsidence with the disorder and uncertainty features according to risk theory. Finally, to get the risk index the water distribution system of Guangzhou city was taken to the risk assessment model utilizing the level of land subsidence identified by the dimensional analytical method. The results showed that the risk of land subsidence under the city water distribution system security upgrade is feasible to provide a risk assessment of the strategic decision-making model.
Global and Local Stability Checking Method of Natural Draft Cooling Towers during Construction
Authors: Zhang Ming , Wang Heng Le
Published: August 2013

Checking the global and local stability of cooling towers during construction is very important to construction safety and reasonable construction process. On the basis of existing researches and by combining the checking method of global and local stability of cooling towers in operation period given in the present design code, this paper presents a method with implementation steps to check the global and local stability of cooling towers during construction. The method is verified to be simple and effective by a cooling tower example. The example analysis indicates that the global stability of cooling towers decreases with the construction height and achieves the minimum when the topmost layer is just built, though it increases bit when all concrete layers reach the design strength. The local stability of cooling towers during construction is poor in the range of 1/5 to 3/5 tower height and should be paid great attention during construction.
Numerical Analysis on the Influence of Thermal Insulation Way of Closure on Smoke Flow Properties in Building Fire
Authors: Peng Xuan Wei
Published: August 2013

The fire smoke flow prediction software developed successfully was applied to simulate a simple building. The effect of different wall structures on the fire smoke flow properties were compared under the condition of same thermal resistance of external wall. Heat absorption of wall has a cooling effect on indoor air in fire process. Wall with external insulation has the most significant cooling effect on indoor air, and that with internal insulation has the weakest. The effect of intermediate insulation is close to external insulation and that of bilateral insulation close to internal insulation. Room temperature and smoke concentration of internal insulation are both higher markedly than of external insulation. The effect of intermediate insulation is close to external insulation and bilateral insulation close to internal insulation. External insulation added to the closure helps to cool indoor air in the fire process. Intermediate insulation should be chosen to add to the inner wall when needed because of the uncertainty of fire location.
The Minimum Ventilation Intensity Research Using Selected Parameters
Authors: Nagy Richard , Košičanová Danica
Published: August 2013

The air ventilation rates defined in Standard STN EN 15 251:2007 present air change rate in which the objective benefit of proper selection of ventilation system and air distribution scheme is lost (erased) in relation to IAQ [1,2]. With help of sensory evaluation in research the total minimum ventilation rate was estimated. It was reason how to determine major boundary condition (air quantity = air ventilation rate) for minimizing of responsibility size of air quantity (quantitative component of ventilation) and maximize the impact of the choice of distribution scheme and the distribution element (qualitative component of ventilation) for transfer and distribution of pollutants in research. The total air ventilation rate for next experimental measurements was established as the intersection of three air ventilation rates according to research harmonogram. This air ventilation rate was necessary to supply to occupant to experimental classroom and also as input value to CFD simulations.
Prevention and Control Technology Research on Rock Burst of Fully Mechanized Caving Faces and Gob-Side Entry
Authors: Tian Zhi Chao , Dong Long Hao , Ma Min , Liu Ye Jiao
Published: August 2013

According to the actual monitoring data of mining environment and rock burst happening on the 3511 fully-mechanized workface in Anyuan coal mine, the research of the rock burst on the workface and its surrounding rock of gob-side entry is done and the reasonable supporting scheme is determined. The research results are of great guiding importance to the coal mining that has similar condition, provide scientific basis for the control technology of rock burst on the workface and its gob-side entry as well as the reasonable identification of support parameters on the gob-side tunnel, and supply technology protection in order to accelerate the advancing speed of workface. Finally it can produce larger economic benefit.
Analysis on Optical Characters of a Seamless Prism Light Guide
Authors: Li Wei , Bai Yun , Dong Bo
Published: August 2013

A seamless prism light guide made of polymethyl methacrylate (PMMA) is introduced in this paper. The light-transporting efficiency and light-distributing character is analyzed. As comparative sample, the optical characters of an opalescent PMMA light guide are also introduced in this paper. Experiments show that the guide has high light-transporting efficiency that makes high illuminance at the end of the guide. The light-transporting efficiency of the seamless guide is nearly two times higher than that of the opalescent PMMA light guide.
Discussion of Hydraulic Calculation Methods for Hot Water Heating Direct Return System
Authors: Fu Yong Zheng , Xiong Yao , Liu Hui Hui
Published: August 2013

For hot water heating direct return system, the common hydraulic calculation method in engineering design is constant temperature drop method,which is calculated from the farthest riser loop. Due to the limit of the minimum pipe size, the method is usually difficult to achieve the hydraulic balance for every riser loop, and it needs the utilization of valves to meet the need. In this paper, through a calculation example, it has explained that every riser loop is very easy to achieve hydraulic balance without the utilization of valves when the system is calculated from the nearest riser loop. Besides, the calculation order of this method has been given.
The Research on Leak Detection System of City Gas Network
Authors: Jiao Jiao Na , Yu Jian Jun
Published: August 2013

Researches on leak detection system of gas network are significant to fault pipelines diagnosis. In the daily operation of city gas pipeline network, pipeline leakage is the most risky failure type. This paper attempts to review and analyze the existing gas network leak detection systems, meanwhile, design a new kind of leak detection system for daily monitoring and leakage detection of gas network. The greatest advantage of this system is to be able to do all kinds of leak experimental research, especially has great reference value for the leak detection task in colleges and universities.
Underground Coal Mine Ventilation Monitoring System Research
Authors: Zhen Liu
Published: August 2013

Underground coal mine monitoring system adopts single chip microcomputer and bus articulated structure, the communication mode is CAN field bus, with various intelligent sensors, it can automatically monitor various ventilation indicators of underground coal mine. The test results show that the system has realized real-time monitoring of distributed mass nodes ventilation parameters, through accurate monitoring, simple system structure and flexible operation, it fully meets the need of safe production of coal mine.
An Office Building Energy-Saving Design of Ground Source Heat Pump System
Authors: Yu Wei , Zhu Chun Ying , Gao Meng Hui
Published: August 2013

This article on heating and air conditioning system design of an office building in Langfang city, Hebei province. According to the owners of energy saving and environmental protection requirements and the actual situation, owners of ground source heat pump system. The design from the comprehensive analysis of both the initial investment and operating costs, to offer the choice of reference.
Experimental Study on Thermal Characteristics of the Radiator with On-Off Heating Mode
Authors: Yang Hua , Chen Cai Ling , Xia Guo Qia , Sun Chun Hua , Chi Ke Ren , Li Xiu Hao , Sun Xiang Xiang
Published: August 2013

Based on the simulation experiment system of on-off heating mode in Hebei university of technology ,tests the surface temperature of the radiator under different conditions,fits curves of the surface temperature changes as the time after the valve turns on and off, and compares the actual and theoretical heat emission.This experimental study applies the theoretical foundation of amending the open time ratio reasonably and metering the heat accurately.
The Experimental Study on Fresnel Lenses Concentrator Solar Cell Cooling by a Novel Micro Flat Plate Heat Pipe
Authors: Guo Na Na , Quan Zhen Hua , Zhao Yao Hua , Liu Hui Min , Guo Wen Fang , Yu Dan
Published: August 2013

A novel micro flat plate heat pipe, micro heat pipe array, was used as heat transfer element in Fresnel lenses concentrator solar cell cooling based on its temperature uniformity and the high thermal conductivity. The contrast experiment was carried out in September in Beijing and the cell performance had been studied for difference cooling means, respectively by ordinary fin and "heat pipe and fin". Experimental results show that compared with cooling by the ordinary fin, for "heat pipe and fin" cooling cell the cell temperature is reduced by maximum 8.2% and maintained at about 55°C. The maximum power is 13.21 W, increases by 7.6%. And the photoelectric conversion efficiency improves 6.1%, with maximum efficiency of 24.13%.
The Impact of Double Skin Facade on Building Energy Consumption in Daylighting Control Mode
Authors: Yang Hua , Sun Xiang Xiang , Xia Guo Qiang , Sun Chun Hua , Chen Cai Ling
Published: August 2013

Energyplus is used to discuss the impact of double skin façade (DSF) on building lights, heating and cooling energy consumption in daylighting control mode by simulating the building lights, heating and cooling energy consumption with different height of double skin façade (DSF) and different air cavity width .Thus the influence rules on the lights, heating and cooling energy in daylighting control mode can be found.
The Research on Influence of Different Forms of Window on Indoor Natural Ventilation in Residential Building
Authors: Huo Xiao Ping , Hu Jia Yu , Li Dan
Published: August 2013

The indoor temperature can be reduced by rationally using natural ventilation in summer. Based on the computational fluid dynamics software of AIRPAK, its convenient to simulate the air velocity field and temperature field of a house. Comparing software numerical simulation results with measured data, we conclude that under the maximum limit of window-wall ratio, the bigger the windows are, the greater the airflow effect is, the better the indoor ventilation effect is.
Research and Development of the Terminal Heating Machine under the Mode of Central Heating
Authors: Liu Dan
Published: August 2013

To meet the heat metering reform, reduce the excessive heat and energy waste in the process of central heating , achieve the goal of " low consumption, low emissions, low pollution ", on the base of forced convection of air, the Terminal Heating Machine has been researched and developed such as the process coil as the core technology. As central heating terminal device, has high heat dissipating capacity, reliable performance, long service life, low cost, energy saving and environmental protection advantages, good operation effect, the indicators all meet the design requirements.
Preliminary Study on Vibration Absorption of Nonlinear Beam Bridge under Long-Time Moving Loads
Authors: Yang Xin Wei , Li Hai Tao , Guo Xiu Ying
Published: August 2013

Beam bridge is forced to vibrate when moving loads pass, which will bring up potential damage to the safety of people and bridge. Tuned Mass damper (TMD) is introduced to study the vibration of beam bridge. A mid-span deflection model of beam bridge is established when moving loads pass with a constant velocity successively. The numerical results shows that TMD can reduce the amplitude of midspan efficiently when long-time moving loads pass through beam bridge.
Estimation Method of Cable Tension Based on Iterative Algorithm and Optimization Algorithm
Authors: Huang Yong Hui , Luo De Quan , Rao Rui
Published: August 2013

The vibration method is usually used for field measurement of cable tension of cable system bridges. The cable tension evaluation method is mostly based on the simple taut string theory. However, the simple theory may cause unacceptable errors in many applications especially for the cables with big bending stiffness and two ends fixed boundary conditions. In this paper a cable tension estimation method based on iterative algorithm and optimization algorithm is presented and implemented using finite element method and ANSYS soft ware. Compared with the analytical method and empirical formulas the method presented in this paper is more convenient and the application range is more extensive. The accuracy of the method has been verified by a set of test. In the end, the method is used to estimate the cable tension of a tied-arch bridges suspenders.
Modeling Unstressed State of Kinematic Indeterminate Systems
Authors: Lin Zhi Bin , Yuan Xing Fei , Qian Ruo Jun
Published: August 2013

Kinematic indeterminate systems under construction state and even in-service state may undergo marked displacement. The mathematical model is developed for determination of displacement in kinematic indeterminate systems. The proposed procedures are extended to describe unloading process from prestressed to unstressed state, with particular emphasis on the applications of the unstressed state analysis of practical interest.
The Two-Order Quasi-Linear Singular Perturbed Problems with Infinite Initial Conditions
Authors: Xu Han
Published: August 2013

In this paper a kind of quasi-linear singular perturbed problems with infinite initial conditions is investigated. The existence and uniqueness of the solution are proved.Therefore the asymptotic analysis of the solution can be obtained.
Numerical Triaxial Apparatus and Application
Authors: Wang Xiao Liang , Li Jia Chun
Published: August 2013

A numerical triaxial apparatus based on discrete element method is developed on the platform of Yade using Python script. A DEM model with rolling resistance contact considered is proposed for dense granular materials, which is then applied in triaxial compression test of Chende sand. Stress-strain response and volume-axial strain response of the DEM model agree well with that of experiments, with a good prediction of dilatancy angle. Degradation of granular materials duo to particle erosion is also investigated using triaxial compression tests. It is indicated that peak friction angle decreases with the remove of particles if strong force network of granular materials is destroyed.
Multi-Domain Analysis by FEM-BEM Coupling and BEM-DD Part II: Convergence
Authors: Elleithy Wael
Published: August 2013

In Part I of this paper, a mixed Dirichlet-Neumann interface relaxation method for boundary element–domain decomposition (BEM–DD) is presented. In this part, the convergence conditions of the mixed Dirichlet-Neumann interface relaxation finite element-boundary element coupling (FEM–BEM) and for BEM–DD method are established.
Wounding Composite Pipeline with Internally Pressurized Conditions
Authors: Mustaffa Zahiraniza , Taufiq Mohammed Badri , Albarody Thar M. Badri
Published: August 2013

Although installing offshore pipelines by reel-laying method is eases and cost-effective, still conceal some of plastic deformation into the pipeline which may, in combination with ageing, affect strength and ductility of the pipe material. Therefore, reeling pipelines that internally pressurized is addressed in this study sifting parametrically pipelines stiffness to prevent the ovalization and bifurcation produces during spooling of (initially straight) or laying of (initially bent) pipe. A combination of composite materials is examined and number of bending cases at the limit of ovalization and bifurcation is investigated. It is demonstrated that composite pipeline exhibit more bending stability than Steel. Results on the strain energy release in the reel lay system are presented, extending the findings of previous works on the methods of spooling and laying mechanism.
Vibration of Long-Span & High Pier Continuous Rigid-Frame Bridge due to Traffic Load
Authors: Yan Dong Huang , Hong Si Wei , Yuan Ming
Published: August 2013

The bridge vibration problem would be highlighted due to flexibility of bridge when traffic is run on the long-span & high-tower continuous rigid-frame bridge. The finite-element (FE) software of bridge-vehicles coupling vibration theory was utilized to analyze traffic load influence on bridge vibration. It is found that the vehicle accelerations are varied greatly in the middle of mid-span and edge of side-span and vehicle bodies are plunged. According to the evaluating indicator of comfort level, people feel sea-sickness when vehicles run in design speed with fundamental frequency. Due to fundamental frequency of body in different speed, the sea-sickness feel will be stronger with lower speed. The impact action can be decreased by the increase number of vehicle-line load, and it is affected by the distance of vehicle-line load.
Dynamic Characteristic Analysis of the 3D Spring Model of Column with Triangular Section
Authors: Song Meng Yan , Tian Ge , Yuan Ming Wu , Ge Li Na , Song Jing Jing , Fu Xiang Rong
Published: August 2013

In this paper, the equivalent mechanical spring model of the three-dimensional continuum is studied. By using stiffness calculation formulas of three-dimensional continuum column under axial force and bending force, which are primary force states in the column, a mechanical equivalent trusses model with the same width and height is derived. The equivalent model is statically indeterminate trusses system of spring. The 3D spring calculation model can be used in the dynamic characteristic analysis. With the comparison of the first four order frequency values between the solid model and the equivalent spring model, it shows that the equivalent spring model not only have the equivalent stiffness in the static analysis but also have the equivalent dynamic characteristics in the dynamic analysis.
Effect of Ground Fissures on Subsidence in Xi'an Metro Line 2
Authors: Liu Chao , Su Li Jun , Xu Xing Qian
Published: August 2013

The subsidence value in fissure site and no fissure site respectively is calculated when ground water is pumped. The relationship between ground fissures and ground subsidence is determined by calculation and then the cause of land subsidence is concluded. This study can solve the problem of ground subsidence in the construction of south section of Xian metro line 2 and it offers theoretic basis of prevention and treatment.
The Internal Stress Optimization of Structural Model Based on Super Finite Element Calculating Software
Authors: Hao Ying Qi , Wang Si Qi
Published: August 2013

The structural optimization based on FE (Finite Element) software ANSYS is an emerging subject which is combines computational mechanics, mathematical programming, computer science and other engineering subject. Up to now, substantial research breakthroughs have been achieved in optimization theory. This essay is mainly about the theory analysis and internal stress optimization on the modal displayed on the contests of the Fifth National Structure Design Contest for College Student, including selection of basic components, size detail optimization of components. The optimization of structural stress is to find the optimal solutions while keep the variable within certain range. As for this paper, it is to find the optimal solution to mass while the internal stress, component size, load are under constrained. Finally, to ensure the safety of structure and component, analysis was made on the computation results.
Another Solving Equation of Elastoplastic Problem Based on Stress Strain Relation
Authors: Li You , Peng Yi
Published: August 2013

Based on relationship between elastic and plastic strain, a new basic equation system of plasticity mechanics was established. In this paper, modification is made to the new basic equation system, and another form of basic equation system is presented based on stress strain constitutive relation, which also makes it possible to apply the results from elasticity mechanics directly to plasticity mechanics and decreases the solving difficulty of plastic problem. Finally, a simple application example is given, which shows that the new form of basic equation system is correct and practicable.
An Improved Dynamic Programming Method for Solving the Problem of Nonlinear Programming
Authors: Zhou Yang , Chen Rui Xing
Published: August 2013

This paper, which based on the conventional dynamic programming solution , using the method that the decision variables of various stages are fully discrete in their feasible region to solve the optimal target function value under the various state variables. The method can be generic in solving the maximum and minimum objective function value, while avoiding the problem of the different discrete step lengths of the state variables lead to lower the precision of the target value. So, the method will make the solution process of the various stages more specific image, contributing to combining with the practical problems and understanding the connotation of the practical problems (e.g. water resource optimization allocation ).
A Coupled SBFEM-FEM Approach for Evaluating Stress Intensity Factors
Authors: Shi Ming Guang , Song Chong Ming , Zhong Hong , Xu Yan Jie , Zhang Chu Han
Published: August 2013

A coupled method between the Scaled Boundary Finite Element Method (SBFEM) and Finite Element Method (FEM) for evaluating the Stress Intensity Factors (SIFs) is presented and achieved on the platform of the commercial finite element software ABAQUS by using Python as the programming language. Automatic transformation of the finite elements around a singular point to a scaled boundary finite element subdomain is realized. This method combines the high accuracy of the SBFEM in computing the SIFs with the ability to handle material nonlinearity as well as powerful mesh generation and post processing ability of commercial FEM software. The validity and accuracy of the method is verified by analysis of several benchmark problems. The coupled algorithm shows a good converging performance, and with minimum additional treatment can be able to handle more problems that cannot be solved by either SBFEM or FEM itself. For fracture problems, it proposes an efficient way to represent stress singularity for problems with complex geometry, loading condition or certain nonlinearity.
Refined Member Calculating Model for Dynamic Damage Process Simulation of Single Layer Latticed Shell
Authors: Qi Lin , Huang Zhao Wei , Hu Xue Ying , Huang Xin , Liu Tao , Cai Hao Liang , Zhu Xu Dong
Published: August 2013

Based on mechanical characteristics of the single layer latticed shell member, two buckling types of structural compression members are summarized. The pre-buckling and post-buckling mechanical behaviors of the member are simulated by different calculating model, and the member calculating model are founded by which the likely buckle-straighten processes of the member and the form-disappear processes of the plastic hinge can be simulated. Numerical computing results indicate that based on the member calculating model presented in this paper, the changes of member mechanical behaviors and the consequent complex changes of structural bearing capacity in the seismic dynamic responses process of single layer latticed shell can be calculate accurately, and the refined simulation of the full-range dynamic response process for single layer latticed shell subject to dynamic excitation are realized.
Accuracy Assessment of Nonlinear Least Squares Adjustment Parameters
Authors: Li Gui Ling , Mei Fu Liang
Published: August 2013

The research of variance-covariance propagation of nonlinear least squares adjusted parameters must keep pace with the development of nonlinear least squares adjustment. In this area, the existing result is inclined to the variance-covariance propagation of observation value, and the nonlinear least squares adjusted parameters precision is seldom concerned. This paper gives a variance-covariance propagation of nonlinear least squares adjusted parameters for different types of data and its calculating formula. The results of example prove that the method is effective and reliable.
Application of Hybrid Genetic Algorithm in Control Network Adjustment
Authors: Chen Wei
Published: August 2013

In this paper a hybrid genetic algorithm which consists of the simplex method and the genetic algorithm is proposed for the defect of poor local search ability of genetic algorithm. The hybrid genetic algorithm has the advantages of good global convergence of the genetic algorithm and excellent local search ablility of the simplex method and can improve search speed and calculation accuracy.The hybrid algorithm is applied to the control network adjustment and experimental results demonstrates the effectiveness and superiority of the algorithm.
Analytical Solution of Linear Intersection Based on Jacobi Algorithm and its Comparison with Least Squares Solution
Authors: Zeng Huai En
Published: August 2013

The paper introduces the Jacobi algorithm, and the Jacobi algorithm solution of linear intersection. A numerical cased is illustrated to validate the approach. The result shows the Jacobi algorithm solution is approximately equal to least squares (LS) solution, and needs no initial parameter value, and iteration. Thus, it is very important for the nonlinear adjustment, epically for the case that initial parameter value is unknown and hard to be obtained.
Grouting Reinforcement of Governance on Detecting Evaluation of Goaf by Using GPR
Authors: Li Jin Kui , Du Liu Jie , Li Jing Jing
Published: August 2013

The existence of underground goaf causes serious harm to the security and stability of the surface installations. Using the ground penetrating radar (GPR) detects the nine road in Jinzhou District of Dalian across the railway line three goaf grouting reinforcement. This article introduces the principles and technical methods of GPR, including data acquisition and data processing of GPR, discussing the effect of using GPR technology to detect the superficial goaf.