bluuebunny/crossref_metadata_2025 huggingface dataset:
Ventilation Quantity Analysis on Different Ventilation Opening Area of Courtyard Sunspace
Authors: Chen Ming Dong
Published: June 2012

The courtyard sunspace was built up according to courtyard characteristics of rural residence in Qingdao, A mathematical model was established for courtyard sunspace solar house based on its heat transfer mechanism, and the relationships of sunspace ventilation opening area, courtyard sunspace temperature and indoor ventilation quantity was analyzed. The results showed that temperature of courtyard sunspace will decease with increasing ventilation opening area of courtyard sunspace and lead to decrease the indoor ventilation quantity, which will provide theoretical basis for ventilation opening design of courtyard sunspace.
Hanging and Top-down Construction of a Ventilation Shaft in Soft Soils
Authors: Yang Zi Song
Published: June 2012

“Hanging and Top-Down” (HTD) Method of ventilation shaft construction Technology will be described in this paper. Using this method, the shield pass a more shallow ventilation shaft pit quickly just close beneath it, the tuyeres between the tunnel structure and the base slab of ventilation shaft pit are constructed later using a technology similar to “top-down method”, and the tuyeres hang at the base slab of the pit, no dewatering adopted during the construction. This paper will also address efforts at solving the problems the technology encountered, especially the method to control the deformation of tunnel structure.
Numerical Analysis on the Temperature Distribution of Steel Tube Reinforced Concrete Columns Subjected to 3-Side Heating
Authors: Xu Lei , Liu Yu Bin
Published: June 2012

The temperature fields of steel tube filled concrete columns are analyzed by a nonlinear FEM model in the paper. The theoretical results are validated by relative test results, and a good agreement is obtained. Using the theoretical models, the influencing laws of temperature rising time; section perimeter; steel reinforcement ratio and sectional core area ratio on temperature field of STRC subjected to 3-side fire are further discussed. By above parametric analysis, it has been found that the effects of heating time, sectional dimension and sectional core area ratio on temperature field are significant, but steel ratio has very little effect on temperature both of steel tube and of section surface.
Thermal Shock on Cylinder Head Induced by High Power Laser
Authors: Pang Ming , Liu Chang Zhen , Xie Zhi Min , Xu Guang Hui
Published: June 2012

Experiment of thermal shock was conducted by laser on cylinder head of graphite cast iron. Infrared pyrometers were mounted on the top of the workbench to sample the transient surface temperatures. The high resolution CCD camera was employed to sample transient images of the cylinder head. Microstructure of thermal shocking specimen was characterized by scanning electron microscopy (SEM) and optical microscope (OM). Mechanical properties of thermal fatigue specimen were evaluated by hardness. Results show that microstructure and hardness are not obviously changed, which mean that cylinder head of graphite cast iron has performance stabilization within the rang of thermal shocking temperature.
A Case Study of an Optimization Retrofit of the Heat Supply System in a Campus of Tianjin
Authors: Ma Shu Ling , Ding Yan , Shen Ren Jun , Zhu Neng
Published: June 2012

According to the phenomenon of insufficient utilization of the geothermal water in the heat supply system of a campus in Tianjin, an optimization retrofit scheme with cascade utilization of the geothermal water is introduced in this paper. The energy efficiency of the heat supply system was improved after the retrofit: 30% of the electricity consumption was saved and an extra building area of 120,000 m2 could also be served by the same heat supply system.
Scale Inhibitors Used in Cooling System and the Determination of their Dispersing Power
Authors: Qi Xiao Lu , Yue Guan Hua , Shen Jing
Published: June 2012

One of the key technologies in recycling cooling system is controlling scale formation, practices have shown that the chemical antisacle method of using inhibitors is the most economic and effective technology. Inhibitors can antisacle by their properties of complexation, lattice distortion and dispersity. In this paper, an easy and effective method of calcium carbonate powder to test their dispersing power is put forward. And by this, the dispersing power of 7 low molecular inhibitors and 9 polymer inhibitors have been determined and ordered, this will provide a significant experimental basis for screening inhibitors.
Effects of Vent Height on Ventilation Quantity of Courtyard Sunspace
Authors: Shi Yan , Chen Ming Dong
Published: June 2012

The utilization of the solar energy could be promoted by the application of courtyard sunspace, and meanwhile fossil energy consumption could be reduced. Sunspace temperature and ventilation quantity with different vent height was simulated and analyzed. The results showed that ventilation quantity was increase with increasing vent height, and ventilation quantity decrease when vent close to sunspace top, the maximum ventilation quantity reaches 150m3/h based on selected sunspace size. The theoretic principles to improve the sunspace ventilation effectiveness could be provided.
Methodology for Optimizing the Heating Capacity of Heat-Source Equipments in Double-Energy Radiator Heating System
Authors: Li Feng , Tian Zhe , Fu Qiang , Li Qian Ru
Published: June 2012

The double-energy heating system studied in this paper is consisted of centrifugal sewage-source heat pumps and gas boilers. As the grade and price of the two kinds of energy are different, the heating capacity of the heat-source equipments would have a directly impact on the energy consumption and operating cost of the system. In order to obtain the optimal heating capacity of the heat-source equipments, the calculation models on equipments utilized in this system are firstly established, and then different combination patterns of the heat-source equipments were analyzed on the basis of minimum operating cost, finally, the optimal heating capacity of the heat-source equipments and the heating performance factor (HPF) of the system in different outdoor temperatures were obtained, the results indicate the average HPF of the system in the heating period is 3.57. The method and results provide reference for scientific design of the double-energy heating system.
Application Analysis of the BCHP System with the Soil Source Absorption Heat Pump Driven by the Flue Gas
Authors: Zhao Xi Ling , Zheng Zhong Hai , Fu Lin , Li Yan
Published: June 2012

How to use the waste heat deeply are a critical issue for BCHP (Building combined cooling heating and power) system. A BCHP system with a soil source absorption heat pump driven by the waste heat is proposed. The system is composed of an internal combustion engine, a soil source absorption heat pump driven by the flue gas, and other assistant facilities, such as pumps, fans, and end user devices. In the winter, the flue gas is used to drive absorption heat pump to recover the waste heat of the soil source and the condensation heat of the flue gas simultaneously, and in the summer, the waste heat of the flue gas is used to drive absorption heat pump to cooling, and the heat sink is the soil. In the paper, the configuration of this kind of system is designed, and the energy analysis of the system is done all the year. Compared with the conventional BCHP system, the operation cost is lowered greatly and the increased investment could be returned within one year. It is show that the system is the efficient integration of cleaning energy, renewable energy, the discharge of the flue gas could be reduced to below 30°C, and the water steam could be catch to avoid the white smoke of the stack. The energy saving in space heating could be 66% compared with the conventional BCHP systems.
Influence of Surface Boundary Conditions on Architectural Indoor Thermal Environment with Air Conditioning
Authors: Liang Yuan
Published: June 2012

In order to analysis influence on indoor thermal environment with surface boundary which are the first boundary condition and the second boundary condition under the average temperature distributed hourly of the outdoor air, indoor thermal environment model of single architectural with air conditioning was established, and the indoor thermal environment was simulated by the CFD software. The results show that, there is a little influence between the two kinds of surface boundary conditions, and the two kinds of surface boundary conditions could be considered as equivalent.
Study on Overburden Strata Rupture Development Height Rules in Repeated Mining of Thick Coal Seams
Authors: Zhao Nan Nan , Yang Yong Jie , Wang Chang Qing
Published: June 2012

Take 3 coal repeated mining of Luxi colliery as research background, overburden strata rupture development rules in repeated mining of thick coal seam were studied by using the methods of field measurement. The results indicate that the height of overburden crack belt reduced along with the increase of goaf development time; the crack belt height of upper layer is 34.73m, the ratio of crack height and mining thickness is 15.1, the crack belt height of lower layer increased to 41.51m, but the increased trend declined, the ratio is only 12.14, the development height after up-layer was excavated is 83.6% of the height after two coalface were excavated. The results have important guiding sense for predicting overburden rupture rules in the similar mining conditions and improving the upper limit.
Geospatial Data Organization and Realization of Three-Dimensional Terrain Visualization in Yuntai Mountain Landscape
Authors: Fu Jian Chun , Yan Song
Published: June 2012

After making deep analysis of the geospatial data organization mode, data clipping, data extraction, data mosaic of terrain original data, which are based on geospatial database theories such as ArcGis, GeoDataBase, are studied in detail. This research, beneficial for sharing and inter-operation of spatial information, makes it possible the realization of the three-dimensional visualization in Yuntai Mountain area of Jiaozuo.
The Optimization Shortest Path Algorithm and its Application in Campus Geographic Information System
Authors: Tang Jing Jing , Wu Wei Zhong , Wang Zhen Hu
Published: June 2012

To manage the campus space information effectively, and provide faster query and browse function to user, a straight line optimization algorithm was proposed. The algorithm regards the target node’s situation and direction as constraint condition when searching map nodes in road network. The algorithm can reduce the number of searched nodes and increase system-search velocity. To prove the algorithm’s practical application, a small campus geographical information system is built on a component geographical-information-system development platform. In this system, the algorithm is used to simulate searching the shortest path between two desired nodes. The simulation result indicates that this algorithm can search the path quickly and reliably.
Research on Set up of Web-Based Surveying and Mapping Data Processing Center
Authors: Yang Jin Ling , Zhou Qiu Sheng , Cao Xian Ge , Song Hai Feng , Meng Xiang Lai
Published: June 2012

The set up of Web-based Surveying and Mapping data processing center, not only conducive to the standardization and modularity of Surveying and Mapping data processing, but also help the management and use of data, making the data providers and users no longer subject to geographic areas restrictions; at the same time as using the B/S (Browser/Server) architecture network platform, users avoid the installation process, saving the user's system resources.
Data Sharing of Digital Basin Based on GML
Authors: Yuan Yan Bin , Xia Wen Zhao , Yuan Xiao Hui , Chen Ying , Zhang Bo
Published: June 2012

The data for establishing digital basin has the features of large quantity, heterogeneity and multiple dimensions. Determining how to effectively manage and share the data is the key for digital basin. This paper shows an information sharing model for digital basin based on metadata directory, Service-Oriented Architecture (SOA) and publishing/subscription technology. And then, for easily transmission, we preliminarily accomplish the data conversion based on Geography Markup Language (GML).
The Influential Factors for Sustainable Development of Surveying Engineering in Construction Market
Authors: Li Bao Long
Published: June 2012

In construction market, how to achieve the sustainable development of surveying engineering is an important issue. Therefore, there is a need to study the influential factors for sustainable development of surveying engineering in construction market. We used the common hypothesis in theoretical study for reference to establish model structure, and we selected two influential factors. Conclusion could be drawn that, the sustainable development of surveying engineering could be realized by choosing the right influential factors in construction market.
On Local Deflections of the Vertical Based on EGM2008 and In Situ Data
Authors: Liu Xin , Zhang Li Guo , Guo Jin Yun , Ju Xiao Lei , Mai Zhao Qiu
Published: June 2012

The Earth gravitational field model EGM2008 with the high resolution has been applied in data processing and analysis in practical geodetic and geophysical study. We calculate the deflection of the vertical on testing areas in China from EGM2008 with the different grids based on the geopotential theory. What’s more, the precisions of the deflection of the vertical determined with EGM2008 up to different degrees and orders are compared and analyzed by calculating the actual astro-geodetic data and modelled data to evaluate the regional quality of EGM2008 with in situ data. Precisions of meridian and prime vertical components of vertical deflections estimated with EGM2008 up to 2190 degrees are 1.59″ and 1.74″, respectively.
New Testifying Method of Unit Weight Mean Square Error of No-Equal Precision Independent Surveying Values
Authors: Deng Yong He
Published: June 2012

For unit weight mean square error of no-equal precision independent surveying values,this paper summed up several old estifying methods, pointed out their scarcities or mistakes, and advanced a sort of new method- maximum likelihood estimation method which is simple and strict.This is useful for theory of unit weight mean square error of no-equal precision independent surveying values to be perfect and for college surveying textbook to be improved and unified.
Research on the Principle of Coaxiality Measurement
Authors: Han Zhao Lin , Yuan Mao Xing
Published: June 2012

When measuring the coaxiality of a cylinder, we often get the poor reproducibility of measurement results. This phenomenon is related not only to its measuring machine condition, but also to the measuring method. The main factors that cause measurement errors are analyzed in this paper, and some solutions to improve the measurement results are provided.
The Hawking Radiation of the Charged Massive Particle via Tunneling from a Plane Symmetry Black Hole
Authors: Jiang Qing Quan
Published: June 2012

In Anti-de Sitter space-time, we develop the Parikh-Wilczek’s semi-classical quantum tunneling method to investigate the Hawking radiation of the charged massive particle via tunneling from a plane symmetry black hole. The result shows that, when taking self-gravitation interaction into account, the tunneling rate of the charged massive particle is related to the change of Bekenstein-Hawking entropy, and that the exact emission spectrum is not strictly pure thermal, but is consistent with the underlying unitary theory.
Construction Survey of Main Truss of the National Stadium “Bird's Nest” Project
Authors: Ma Shu Ying , Zhang Kai
Published: June 2012

Construction of large steel structure is the key point of the whole National Stadium “Bird's Nest” project, while construction of main truss is the core of the whole steel structure construction. As connection of main trusses will be carried out overhead, the positioning survey work is quite difficult. This paper introduces the construction survey work of main truss.
The Application and Comparison of Digital Ground Photogrammetry Technology for Bridge Safety Monitoring
Authors: Chen Ming Zhi
Published: June 2012

For needs of transportation, it is more and more obvious of the bridge unsafe, and the study of bridge safety monitor will become more important at the area of civil engineering. In this paper we discuss the methods of digital ground photogrammetry for bridge safety monitoring and the application of those, we took digital cameras and 3-D laser scanners as the tools for close-range photogrammetry, and adopted 3D Time Baseline Parallax combined with Kalman Variance Filters as the theories for monitoring dynamic deformation, then developed software to deal with data, which can draw curves of dynamic deformation automatically, we can monitor the deformation regularity by these curves effectively, then we can monitor and analysis the safety of bridges by this way. The method we designed is very simple and economical, and we also did a lot of experiments to verify availability of this system, and we happy to say that the system has the characteristics of high automation degree, large data collection capacity and strong system reliability, etc. It will be practical value at the area of civil engineering.
Partial Correlation Analysis of Color Reflectance of Dynamic Moisture Transfer of Fabric and Static Physical Indicators of Fabric
Authors: Cao Jian Da , Wu Xuan Run
Published: June 2012

This article first selects the seven kinds of fabric to observe fabrics for cobalt chloride drying, moisture absorption color from blue to pink change processes, and in 0 minutes to 30 minutes seven time taking pictures of fabric. Photos of extracting the spectral photometry instrument of reflectance as the characteristic value, also measured the seven fabric static physics index, and then the reflectivity of fabric and static physical indexes of the partial correlation analysis. The results show that when Controlling the moisture content, partial correlation coefficient of the reflectivity and thermal resistance is the highest, about 0.916, the second is when the moisture vapor transmission control, partial correlation coefficient of the thickness and the reflectivity is 0.884; The moisture content and moisture vapor transmission rate, air rate and reflectivity also has certain relations, core suck height and reflectivity does not exist partial correlation relationship.
Design and Research of a Microgravity Floating Target Satellite System
Authors: Zhang Xia , Feng Yong Ke
Published: June 2012

In order to study the control method of position and attitude of the satellite, a simulation platform is built. The quality characteristics of the target satellite system and the reaction flywheel system are analyzed. The dynamic model of target satellite is built to study its dynamic character. Based on the CAMSHIT algorithm, the attitude and position of the target satellite is measured, and the control method of position and attitude is established by use of jet device and the reaction flywheel. The effectiveness and accuracy of the position and attitude control method are verified by the experiments.
Application and Study of the Connected-Mixed-Spraying Methods in the Sprayed Concrete Slope
Authors: Sun Ping Ping
Published: June 2012

This article summarizes the current status technology of sprayed concrete slope vegetation restoration and analysis the key technical issues of restoring vegetation on sprayed concrete slope surface, brings out an evaluation system of the restoration of vegetation, the author had studied and created a suitable structure of vegetation recovery for Sprayed concrete slope, through the engineering practice that can be further large-scale promotion and use, for the industry to provide a new solution.
Cause Analysis and Countermeasures of Emulsified Explosive Misfire in Vertical Shaft Frozen Zone Excavation Blasting
Authors: Wang Hai Bo , Zhao Yao Cai , Zong Qi
Published: June 2012

Emulsion explosive have well frost resistance, it can be stably detonated at -300C. But there are many misfires occurred in blasting construction of shaft frozen zone. After analysis, the causes was water in the hole frozen and it’s volume increased, so explosive cartridge was pressed, it’s density enlarged, and misfire created when it’s density exceed critical density of stable detonation. Based on analysis, plastic tube casing charge adopted for construction, and prevent misfire effectively.
Stability Analysis of Loess Slope with Hidden Hole by Numerical Methods
Authors: Li De Jian , Zhao Ji Tao , Pang Chuan You , Zang Guo Jia
Published: June 2012

With finite difference code Flac3D, the stability of loess slope with hidden hole at different locations has been evaluated. Failure mechanism of loess slope is also studied. Under plane strain conditions, the results of numerical simulation show that the existence of hidden hole has a direct impact on the stability of the loess slope, and sometimes decreases the safety factor. The failure of hidden hole also directly affects on the overall destruction of slope. Consequently, at the stage of loess slope design, it is necessary to carefully evaluate the stability of loess slope with hidden hole. Particularly, it is important to consider the influence of stability by the position of hidden hole in loess slope.
Construction Technology of Lift Slab with Concrete Filled Steel Tube Columns
Authors: Liu Jin Ming
Published: June 2012

Abstract. This paper discusses a lift slab building with concrete filled steel tube columns. Lift slab construction as a methodology has advanced on improvements in traditional lift slab construction technology. When concrete filled steel tube columns are used, the strength of the concrete in the tube is obviously enhanced by the hoop action derived from the steel tube. The section of the concrete filled steel tube column is smaller than the section of the reinforced concrete column, thus realizing cost savings in material and labor. Also, because the steel tube hasn’t been filled with concrete when it is assembled, the steel tube is much lighter than the traditional reinforced concrete column. Thus, the assembly of steel tube columns without concrete is easier and crane-lifting requirements are less. This paper describes the construction of a building utilizing current LSCSTC – Lift Slab Construction with Concrete filled Steel Tube Column technology.
Cross-Sectional Stiffness Analysis and Support Span Calculation of WPC Decking
Authors: Wang Hai Ying , Li Da Gang , Wang Yu Mei , Lin Dong Liang
Published: June 2012

The engineering design and installation of WPC decking directly affect its safety and service life. The flexural strength, stiffness and support span calculation of WPC decking is the primary consideration during its engineering design. This paper described the design principles of WPC decking. When WPC decking is used in engineering application, it must comply with the requirements of both flexural strength and stiffness. The cross-sectional stiffness of WPC decking is analyzed, and the method of increasing its stiffness is proposed. For various cross-sectional configurations of decking profiles, the method of calculating their support span is introduced.
Application of Cement-Soil Mixing Pile with Bearing Load Plate
Authors: He Peng Li
Published: June 2012

In order to treat efficiently with the soft multi-layers in the middle of ground, the improved cement-soil double mixed pile is developed and the pile diameter is enlarged in the soft soil layer depth to form the cement-soil mixed column with bearing load plate. The installation mechanism, deep mixing machine, and pile installation procedure of the soil-cement mixed pile with bearing plate is presented. The field test results show that the cement-soil mixing pile with bearing load plate construction technology can ensure the cement mix content and mixing uniformity. The pile strength is greatly higher than conventional cement-soil pile, so it can be used to improved soft multi-layered ground economically and effectively, and it has a good potential application for practice.
In-Plane Crushing of Square Honeycomb Cores, Part I: Mechanical Behaviors
Authors: Sun De Qiang , Cao Wen Ting , Cai Meng
Published: June 2012

Mechanical behaviors of square honeycombs cores (SHCs) are investigated by using the finite element (FE) simulations under the in-plane dynamic crushing loadings. With the increasing impact velocities, different deformation modes are observed. The force-displacement curves include four regimes with distinct characteristics. The plateau stresses are calculated for the SHCs with different configuration parameters. The dynamic plateau stress is the sum of the static plateau stress and the dynamic enhancement due to the inertia effect. The static plateau stress is proportional to the relative density of SHCs. The dynamic enhancement stress is proportional to the square of impact velocity and the relation coefficient depends on the configuration parameters. The empirical formulas of dynamic plateau stress in terms of configuration parameters and impact velocity are given.
A Key Technique for Cement Concrete Pavement Joint Filler Construction in Chilly Regions
Authors: Liu Ying , Peng Peng
Published: June 2012

Cement concrete pavement joint filler construction is a weak spot. Joint filler debonding is often caused due to unnormal construction, so as to result in decreased pavement quality and reduced pavement service life. This paper describes the successful application of silicone modified polyurethane joint filler to cement concrete pavement in chilly regions, sets performance specification requirements on the filler, and improves and perfects the joint sealing construction process and later inspection technique to provide a basis for joint filler construction henceforth in chilly regions.
The Development and Application of the Media Player Based on Embedded Linux System
Authors: Shi Hao Su , Han Li Na
Published: June 2012

In Linux embedded system, multimedia application is becoming more and more popular based on the ARM process, therefore, it is very urgent that the development of audio and video in one multi-functional player. Using audio and video media library function, IIS interface, DMA control technology and LCD display technology, to development multimedia player function, using Qt complete embedded graphical user interface development so that the system has a good interface. The audio and video data Input/output by the study, using the software decoding, reduces the system development cost, solve the media play the normal player function. The design principle is clear, easy to realize, has a certain practical value.
The Typeface Details Design in Graphic Visual Communication Engineering
Authors: Ouyang Chao Ying , Liu Feng
Published: June 2012

This article describes the concept of the details in typeface design,the details in typeface design’ s effection in transmission power in graphic visual communication engineering. By the analysis of the graphic visual communication engineering examples,it has searched the use of the details in typeface design in graphic visual communication engineering design and the effection of the graphic visual communication engineering information’s transmission,and it also propose how to effectively use typeface design to improve the graphic visual communication engineering aesthetic content and effective communication of messages in graphic visual communication engineering,and reach to the ultimate goal in the last.
Numerical Simulation and Analysis of 3-D Internal Flow Field in Mechanical Turbulent Coal Pulverizer
Authors: Lv Wei , Yao Zhi Yue , Zhang De Li , Wang Xin Hai , Zhang Xiao Nan , Zhao Zhong Xia
Published: June 2012

In this paper, the computation fluid dynamics ( CFD) software FLUENT is applied to analyze the internal 3-D gas flow of the mechanical turbulent coal pulverizer impeller, especially on the pressure and velocity distribution. Eddy current-wake and secondary flow phenomenon is found in the pulverizer.
Design and Simulation Analysis of Steel-Truss Cantilever Structur
Authors: Li Ke , Ji Jing
Published: June 2012

In combination with a industrial plant cantilever structure need be increased for meeting the technological requirements，the three kinds of structural design schemes of cantilever are considered, that is the scheme hanging on steel frame of the plant, prestressed steel frame scheme and steel truss scheme. Three kinds of structural form and materials selection are introduced. By finite element software ANSYS three kinds of schemes are analyzed, carrying capacity and deflection of members under load are acquired, by Comparison steel truss scheme is adopted. Carrying capacity and deflection of structure not only meet requirements, but also the construction is easy. This paper provides reference for resolving similar cantileve r problems in engineering.
A Numerical Proof-Test of Finite Element Method to Simulate Wave Propagation in Ground Soil
Authors: Tao Xia Xin , Zheng Xin , Wang Fu Tong
Published: June 2012

A numerical case study is presented in this paper to demonstrate the feasibility of a finite element method with artificial boundary condition to simulate the wave in 3D ground soil. An unit centralized harmonic excitation at surface is adopted with four frequencies. The calculated vibration amplitudes are compared with the corresponding results by dynamic Green Function in frequency-wave number domain. The result shows a clear calculation error phenomena that the smaller mesh adopted, the smaller error is for a given frequency, and the lower frequency excited so the smaller error is for a given mesh size. A preliminary suggestion is presented as that the maximum mesh size of a 3D discrete grid must be no larger than 1/25 of the minimum wave length.
Micro-Deformation Mechanism of Granular Materials under Different Boundary Conditions Based on DEM Simulation
Authors: Tong Zhao Xia , Zhou Min , Yao Yang Ping
Published: June 2012

Series of biaxial compression simulations are carried out to investigate the effects of boundary condition on the deformation of granular materials by using DEM. The parameters used in DEM are validated by the biaxial compression experiments on elliptical steel bars. The effects of boundary condition on the stress-strain relationship are analyzed. And special focus are put in the analysis of particle displacement, particle rotation, void distribution, particle long axis orientation and contact force with the development of deformation.
A Coupling Modeling Method with ANSYS/FLAC3D and its Application
Authors: Zhou Hua , Wu Xiao Tao , Zhou Dong Ni , Tian Tian
Published: June 2012

A coupling modeling method with ANSYS/FLAC3D is put forward aiming at the technical difficulties and deficiencies in pre-processing for complex geologic body and structural engineering with FLAC3D. The coupling procedure is that, firstly, the three-dimension geometry model is built with ANSYS and the model meshes are divided. And secondly, the element and node data of the completed model built in ANSYS are exported. Based on the corresponding relationship of element and node between ANSYS and FLAC3D, the exported data above is transformed by using the interface program in FORTRAN, then the information is imported into FLAC3D. Thus the three-dimension FLAC3D model for complex engineering is generated coupling with ANSYS. With coupling method, the complex three-dimension model of arch dam-foundation system in large-scale hydroelectric project is built, and the results verify the feasibility and effectiveness of the proposed method.
Wind Speed Profiles of an Actual Downburst Based on CFD Numerical Simulation
Authors: Li Yan , Qu Wei Lian , Ji Bai Feng , Wang Yi Fei
Published: June 2012

Downbursts have led to large number of transmission tower failures in the world, so more and more wind engineers are very interested in such strong wind load. Currently the main numerical simulation method of downburst wind load for structural analysis is based on the horizontal divergent wind speed profile of downburst. There have been several available types of empirical wind speed profiles in which some parameters still need to be artificially determined. So, this is a semi-empirical-analytical method which can not be linked with actual downbursts. Some academics have also used CFD numerical method to simulate downburst wind speed profile of high precision grid. But the initial conditions of these CFD simulations were all assumed ideally. In this paper, the wind speed profiles of an actual downburst are simulated by CFD method based on the initial speed of downdraft entrance provided by cloud model. The simulated wind speed profile decays more slowly than an empirical wind speed profile. This conclusion could be of significance for structural engineers to consider downburst wind load reasonably in the structural wind resistant design.
A Novel Secure Data Transport Scheme for Wireless Sensor Networks
Authors: Zhang Zhi Ming , Xiong Xiao Yong , Deng Jian Gang
Published: June 2012

Sensor nodes may be deployed in hostile environments, and the sensed data is sent to the destination along the routing path, if a forwarding node in the routing path is compromised by the adversary, the data can not arrive at the destination. There are many studies on detection of malicious or compromised node, and remove the compromised nodes form the routing path, but, efficient, reliable, and secure broadcast are the major problems of the schemes. In this paper, we propose a novel secure data transport scheme for wireless sensor networks. The proposed scheme divide the secure data into n shares pair using Asmuth-Bloom threshold secret sharing scheme, and forwarded the n shares pair along the multi-path to the base station, the base station only receives k distinct shares pair from the n shares pair, he can obtain the secure data. The proposed protocol can resist selective forwarding attack, false data injection attack, replay attack, and even if there are compromised nodes in some routing paths, the base station can still get the correct secure data without removing the compromised nodes from the routing paths.
Establishment of the Tour-Site Navigation System - Using HsinChu City as an Example
Authors: Shiau Yan Chyuan , Lu Lian Ting , Chen Tai Yu , Lee Chih Ying
Published: June 2012

As the living quality of the citizens gradually improved, traveling becomes an important recreational activity. The internet speedily provides information related to tour sites. However, web pages generally present merely words and pictures that are not impressive enough to the viewers. Spatial concepts, distance calculation, and tools for vacation planning are also often not provided by the websites. This study combines the usage of 3dSpace, GoogleMap, ER Model, Windows Mobile, SuperPad. It gathers the tour-sites related information of HsinChu city; such as local restaurants, famous attractions, and high rating hotels in the area. The study develops search interface integrated with the Google Map Engine. After selecting of category and input of specific key words, the related information of specific location and 360° satellite image could be shown on browser. The route calculation trips between local attractions is provided on this project. This investigation combines the GPS function to the smart phone, helping the users to arrive at their destination correctly within the minimum time.
X-Ray CT Image Segmentation of Asphalt Concrete Based on Fuzzy C-Means
Authors: Wei Jian Jun , Li Hai Bin , Wan Cheng
Published: June 2012

This study focuses on the threshold segmentation algorithm to obtain the real microstructure of asphalt concrete based on digital image technique, the perlite powder which was a kind of low-density material was put in the asphalt concrete to enhance the density contrast, three different specimens in which added different contents of perlite powder were compacted, and then the asphalt concrete specimens were scanned using x-ray CT to capture the gray images that reflect the density differences of the three constituents such as aggregates, mastic and voids, the CT images were converted to be the histograms. Furthermore, the FCM (Fuzzy C-Means) was demonstrated that it could be utilized to choose proper threshold values and segment images exactly, according to the double peak conditions of the three different histograms, the double peak condition for AC-13 is the best among the three types, a similar double peak features between AK13 and SMA-13 were observed. The results shows that the different contents of perlite powder added in the asphalt concrete can form different double peaks. This is another new method to segment the three constituents of the asphalt concrete exactly.
3D FEM Simulation Analysis for PBL Shear Connectors
Authors: Yu Zhang Liang , Zhu Bing , Dou Sheng Tan , Liu Wen Xiu
Published: June 2012

This paper analyze ultimate bearing capacity, transfer mechanism, failure process and influence of aperture, steel bar diameter, concrete rating and on elastic bearing capacity and ultimate bearing capacity of PBL shear connectors by the finite element analysis software ANSYS. This paper can provide a reference for further design of PBL shear connectors as well as push-out or pull-out test. The results show that the elasticity bearing capacity of PBL shear connectors is determined primarily by concrete while the ultimate bearing capacity is determined primarily by perforative steel bar.
Skills for Animated AutoCAD Drawing with PowerPoint
Authors: Zhang Hui Ping , Ma Ran
Published: June 2012

The article is about how to paste the drawing designed by using AutoCAD into PowerPo-int, and to show the drawing process in two different forms of animation by examples. By compari-ng the two different forms of animation, it advances more practical methods and skills for animati-on, and for others ' reference.
Numerical Simulation and Design Optimization of the Composite Roof Roadway Support for Large Section
Authors: Yang Ren Shu , Li Zhen Fang , Guo Dong Ming , Xu Peng , Gao Zong Ming
Published: June 2012

Based on the engineering practice of the large section roadway in Zhaozhuang Mine, which has composite roof of mudstone and sandy mudstone, and the shale floor, and did the support optimization design of large section roadway through three-dimensional numerical simulation by using the FLAC3D. To optimize the row spacing between the bolt, it carried out nine group test of numerical simulation program to analyze, six group test of numerical simulation program to analyze the length of the anchor cable, and five group test to analyze the distance of the anchor cable. Through these, the effect of the bolt spacing, the length of the top anchor cable, the anchor cable spacing and other support parameters to the supporting are got, and putting forward an anchor - anchor cable integrated supporting parameters optimization program to match the large section of the composite roof. Results show that it is reasonable to use 950mm x 900mm of the bolt spacing in design, and 7.5 meters length in design the top anchor cable.
Numerical Simulation on Strengthening Supporting Mechanism and Effect of Anchor-Cables in Deep Coal Mine Roadway
Authors: Chang Ju Cai , Xie Guang Xiang
Published: June 2012

Prestressed anchor-cables supporting technology has become the primary measure for reinforcing the roadway of deep coal mine and complex geological conditions. In this paper, fast Lagrangian analysis of continua (FLAC3D) code is used to analyze the laws of stress, deformation and failure of surrounding rock with and without roadway supporting by anchor-cables. The supporting action mechanism and effect of anchor-cables have been investigated into systematically. The results show that the anchor-cables supporting is adopted at reasonable positions of the roadway in good time which can improve the stress states of deep surrounding rock, decrease the range of failure zone around the roadway, control the roadway deformation effectively and maintain the stability of roadway.
Finite Element Simulation of RC Beams and Columns
Authors: Wan Hai Tao , Yan Chao
Published: June 2012

Reinforced concrete (RC) frame structure is one type of building structure which is widely used in China. Damage of some reinforced concrete frame structures under the earthquake is caused by the damage of beams and columns, so beams and columns are essential seismic members. However, the test datum are not enough to study the performance of RC beams and columns , Therefore, Finite element simulation of RC beams and columns is performed by software ABAQUS in the paper. Through comparing with the finite element simulation and the test of load - displacement skeleton curve, failure mode and steel bar strain, the result shows that the finite element simulation can more accurately simulate the situation of the test and verifies the finite element simulation is the most important research tool besides test.
Computational Fluid Dynamics Simulation about the Impact of Products on a Cold Store
Authors: Xie Jing , Tang Yi , Wang Jin Feng , Miao Chen , Zheng Yi
Published: June 2012

The unreasonable airflow distribution often occurs in the cold store. Some specific parameters of airflow in the cold store are difficult to obtain in the practical experiments. The unreasonable airflow causes quality decline and large energy consumption. In this paper, the airflow distributions in an empty commercial cold store and the cold store filled with products were studied by CFD and investigated using the 3D modeling method which combined SIMPLE calculation method and finite-volume method. Meshes of the fan were refined locally with the airflow near the walls was modified by applying the non-wall function. Through comparing the airflow distributions in the empty cold store and in the cold store filled with products, differences such as the lower margin velocity, the smaller width and the deviation of the main steam in the cold store filled with products were found.
3D Numerical Simulation of Flow through a 90 Bending Square Duct
Authors: Wei W.L. , Zhao X.J. , Liu Y.L. , Yang X.F.
Published: June 2012

Abstract:A computational model is implemented to investigate hydraulic characteristics of turbulent flow through a 90 bending square duct. In the numerical solution the governing equations are first transformed by using boundary-fitted coordinate to map the physical domain to a uniform transformed space, subsequently discretized by finite-volume method and collocated grid system, and solved via SIMPLEC algorithm.The flow parameters at the control surface are obtained by momentum interpolation method. The modified k-ε turbulence model is applied to close the Reynolds stresses. The 3D hydraulic characteristics of flows in a bend square duct are computed, and the comparison between numerical results and experimental data shows a very good agreement.
Simulink Application in Structural Vibration Control and Simulation
Authors: Li Rui , Liu Xuan , Xu Hong
Published: June 2012

This paper mainly introduces the application of simulink in structural vibration control and simulation. It introduces the method and procedure of using simulink to establish the control simulation program.Thus obtained, for the establishment of whole shaking table control system and the simulation of control system, simulink has unique advantages, it is the best software for the research and development of the shaking table control system.
Strip Type Rebar of the Rear Sets of Spherical Bodies Anchorage Reinforced Earth Retaining Wall Design Model
Authors: Yu Bo , Tan Yun Zhi , Wang Nan Jing , Ding Pin Liang
Published: June 2012

Participating in the college students reinforced earth retaining wall competition of 2012 "youlinshubulyoke cup", and puting forward set of spherical bodies reinforced in the rear of steel strip rebar in order to increase the anchorage zone of strip type rebar and soil action area ,and converted the friction coefficient between soil and bar tape into soil and soil, thereby increasing the frictional resistance and the pull-out force. Making reinforced earth retaining walls in the same level of load, to achieve the purpose of saving the materials.
Numerical Simulation by DDA and the Fabrics Analysis of Two Dimensional Experiment on Coarse Granular Material
Authors: Guo Pei Xi , Lin Shao Zhong
Published: June 2012

DDA(Discontinuous Deformation Analysis) was used to study the mechanical characteristics of coarse granular material (CGM). The numerical simulation model was found consulting the two Dimensional test of CGM,and the stress-strain curves obtained by the numerical simulation were basically in agreement with the results of laboratory test. It indicates that the numerical simulation is suitable for the mechanical characteristic research of CGM. In addition,the distribution statistic of several fabric elements about interaction between particles was also presented. Some relation between the stress-strain and fabric element change are found after analysis.
Research on Fault Diagnosis Method Based on CBR and Rough Set Theory
Authors: Yuan Chun Fei , Cai Jing , Xu Yi Ming
Published: June 2012

Modern fault diagnosis system always is a dynamic, flexible and uncertain complicated system, so many fault diagnosis methods are not effective to determine fault causes. Considering that abundant of fault diagnosis cases have been accumulated in daily maintenance work, a fault diagnosis method based on case-based reasoning (CBR) and rough set theory is proposed. Rough set theory is employed to process reduction on attributes and the weighting coefficient of case description attributes. This method makes full use of the advantage of" let the data speak". At last the method is testified by an example, and the result shows it is feasible and effective.
Numerical Simulation Research for the Optimization of the Wet Flue Gas Desulfurization Tower
Authors: Fang Shun Li , Du Yi Qing , Huang Su Yi , Wen Wu Qi , Liu Yi
Published: June 2012

The wet flue gas desulfurization is the main technology used today in China. Aimed the sintering gas desulfurization tower, Fluent software is used here to simulate the flow in the tower with different gas entrance angle and velocity, and we have got the effect of sintering gas entrance angle and velocity on the flow in the tower. The result shows: an appropriate increase of the gas entrance velocity and a downward inclined angle will be helpful for extending the residence time in the tower of the sintering gas and it will also improve the flow in the tower. This research could provide reference for the design and application of new wet flue sintering gas desulfurization tower later.