bluuebunny/crossref_metadata_2025 huggingface dataset:
Design of a Self-Tunning Temperature Controller for a Coal Sample Burning Point Detecting Instrument
Authors: Chen Xiao Yan , Dong Chao Yi , Dai Guang Zhi
Published: September 2011

The burning point of coal sample is a crucial physical property of coal, and it is also a key technical parameter for the exploitation, transportation, and application of coal. The national standard for coal sample burning point detection prescribes a strict rising rate of temperature when coal samples being heated. To meet with this engineering requirement, we introduce a scheme of a coal sample burning point detecting instrument, which is based on an AT89C55 MCU. The characteristics, key techniques, and solutions of the temperature control system are introduced with respect to the instrument. We employ a self-tunning Dahlin controller with a Recursive Least Squares with Exponential Forgetting (RLSEF) algorithm to solve the control problems of this time-delay, big inertia, and time-variable plant (coal sample heating furnace). Simulations show that the self-tunning Dahlin controller is able to not only compensate the time-delay and big inertia of the plant and but also adapt to the variations of plant parameters, so that the requirement for the rising rate of temperature can be fulfilled effectively.
Error Analysis of the Illuminance Meter Verification System
Authors: Zou Feng , Wang Jian Wu
Published: September 2011

In illuminance meter verification system, there are many factors that affect verification accuracy. If we can reduce or avoid these factors, the verification system will improve verification accuracy to meet research needs and customer requirements. This paper analyzes the factors in detail during the testing process, such as positioning accuracy and voltage fluctuation. It will help to provide theoretical basis for the future system improvements.
Disquisition of Performance Testing Equipment for Vacuum Booster
Authors: Fan Wei Jun , Jin Lang Bin , Lu Yi , Guo Bin
Published: September 2011

Focusing on the present situation that the domestic research of vacuum booster performance testing is still at the starting stage, combined with vacuum booster performance testing requirements, a vacuum booster performance testing equipment based on VC++ was designed and realized. It consists of two independent modules, including pneumatic control module and software module. Motion control card was used to control load deflection by pulse output. Dates of displacement sensor, force sensor and pressure sensor were real-timely collected by high-speed data acquistion card. After the analysis of industrial control computer, the vacuum booster input-output characteristic, vacuum leak-proofness are contained. Experimental data shows that the equipment can accurately and truly detect the performance of the vacuum booster. Displacement accuracy can be achieved 0.1mm, force accuracy can be achieved 1N, pressure accuracy can be achieved 0.1kPa.
The Implemented of Information Accessibility Human-Robot Interaction System Based on Data-Glove
Authors: Zhang Yi , Li Xiang , Luo Yuan
Published: September 2011

Data-glove is one of the key technologies of Human-Robot Interaction and Human-Robot Interaction is important technology of robot research. In order to achieve Information Accessibility Human-Robot Interaction system based on data-glove. In this article, the data-glove is self-designed and the method of fuzzy reasoning is used for real-time detection of the hand. By bending the fingers to control the states of the intelligent wheelchair’s movement, the Human-Robot Interaction system based on data-glove is implemented .The results of experiment show that the intelligent wheelchair’s movement is very good.
Aluminum Hot Finishing Rolling Process Parameters on the Effect of Temperature Field Distribution
Authors: Fu Zhuo , Liu Yi Lun , Liu Xue
Published: September 2011

According to actual structure parameters and the technological parameters in an aluminum hot rolling production line, consider the rolling of metal plastic deformation heat, the contact surface heat conductivity, friction heat effect on the rolled piece and the roller heat transfer, use finite element analysis software MSC.Marc to build thermo-mechanical coupled finite element simulation model about aluminum hot rolling frame F2. Analyzing different rolling process parameters on the influence of the temperature field distribution regularity, and by adjusting the rolled-piece technology parameters to control temperature distribution, so as to achieve the purpose of improving product quality, and to provide theoretical basis for production of aluminum strip.
The Effects of Deoxidants on Ge-Se-Te Chalcogenide Glasses
Authors: Wang Xun Si , Sun Jie , Nie Qiu Hua , Dai Shi Xun , Zhang Xiang Hua , Bureau Bruno , Boussard Catherine , Conseil Clément
Published: September 2011

In order to decrease the impurity absorption bands of Ge-Se-Te chalcogenide glasses in IR region. Three different kinds of deoxidants including Mg(magnesium), Al(aluminium) and Ca(calcium) were chosen. Properties measurements including density, Vis-NIR and infrared (IR) transmission spectra were adopted to analyze the relationship between impurity absorption bands and deoxidants. The concentrations of impurities in glass samples with different content of Mg were calculated by method of optic spectra. The results show that Mg is a better choice as deoxidant for chalcogenide glasses compared to Al and Ca. The values of main impurity concentration decrease from 4417.833 to 0 ppmw for Ge-O and from 55.236 to 0 ppmw for Si-O with increasing content of Mg, respectively. At least 200ppm Mg is needed to minimize the main absorption bands in IR region and G5 glass incorporated with 400ppm Mg has minimum concentration of impurities which means that it possesses the optimal transmission properties.
Coarse North-Finding Based on Tracking Inversion Points Method without Torque
Authors: Fu Lu Hua , Dong Gui Mei , Feng Li , Lin Yu Chi
Published: September 2011

Based on the principle of tracking inversion points method for north-finding, the tracking inversion points method without torque is presented with a tracking and controlling system. According to the gyroscope’s cursor signal captured in real time, the theodolite can be turned round by the electric turntable to follow the swing of the main axis of gyroscope. After simple calculating, the coarse north can be obtained. The influence of changed torque of hang spring is reduced and the measurement precision is improved. It has been proved through experiments that the coarse north can be obtained in a large range by the tracking inversion points method without torque. The experiment shows that the measurement precision is superior to 30′ and it costs no more than 7minutes to obtain the coarse north-finding.
Research on the Dynamic Loading Method of High Speed Spindle
Authors: Meng Jie
Published: September 2011

This paper presents a method of dynamic loading on high speed spindle used dynamometer. Based on the range of speed and power, considering the performance of different high speed spindle, two loading modes are put forward. The loading system can measure input and output parameters and draw characteristic curve of high speed spindle at one time. These methods can be used to study the dynamic characteristic of the high speed spindle, whose states at different working points are obvious.
Tail Deviation Mechanism and Neural Network Control of the Tandem Rolling Strap
Authors: Wang Guang Bin , Zhao Xian Qiong , Liu Yi Lun
Published: September 2011

In the rolling process, deviation is the phenomenon that the strap width direction's centerline deviates from rolling system setting centerline,serious deviation will cause product quality drop and rolling equipment fault. This paper has established the finite element model to the hot tandem rolling aluminum strap, analyzed the strap’s deviation rule under four kinds of incentives,obtained the neural network predictive model and the control policy of the tail deviation.The result to analyze a set of fact deviation data shows this method may control tail deviation in preconcerted permission range.
Study on Dynamic Measure Experiment of Four-Bar Linkage with Clearances
Authors: Yuan Ying Cai , Cai Ji Fei , Jing Chao Chao
Published: September 2011

For the requirements of mechanism activity, the mechanical pairs need certain clearances. To research the precision and stability of high-speed mechanism, it’s need to study the impaction and vibration which is caused by clearance in pair. A vibration experiment set of four-bar linkage with clearances is designed for this goal, and on the experiment set, vibration wave and data are gotten. The data got from experiment set are consistent to the results of theoretical calculation. From the vibration measure and dynamic model, it’s found that comparing to ideal pair, clearance causes impact in pair and the vibration increasing nonlinearly with rotary velocity.
Repeated-Evaluation Genetic Algorithm for Simulating Social Security in the Artificial Society
Authors: Ye Zi Qing , Yu Xiao Yi
Published: September 2011

In order to find optimal policy to govern agents’ society, artificial agents have been deployed in simulating social or economic phenomena. However, with an increase of the complexity of agents’ internal behaviors as well as their social interactions, modeling social behaviors and tracking down optimal policies in mathematical form become intractable. In this paper, the repeated evaluation genetic algorithm is used to find optimal solutions to deter criminals in order to reduce the social cost caused by the crimes in the artificial society. The society is characterized by multiple equilibria and noisy parameters. Sampling evaluation is used to evaluate every candidate. The results of experiments show that genetic algorithms can quickly find the optimal solutions.
Design of Wireless Real-Time Tracking E-Tickets Based on WIFI
Authors: Feng Jiang , Ding Run Jie , Xia Zhen Yu
Published: September 2011

WIFI with its flexibility and mobility is more and more attention, showing a great prospect. In view of the safety of tourist a kind of the wireless electronic ticket based on WIFI was designed. This ticket can be momentarily written in the tourist information and access the wireless network system. Using the localization technology based on WIFI we can know the tourist real-time track to ensure the life safety of tourist through the electronic ticket. Otherwise, the electronic tickets can be recycled, so it can save sheets and avoid to polluting environment accord with environmental protection and developing a low carbon economy needs.
3D FEM Modeling and Simulation of Resistivity Imaging on Embankment
Authors: Wang Rui , Leng Yuan Bao , Zhou Yang
Published: September 2011

Resistivity imaging and other resistivity methods are widely used to detect hidden troubles in embankments. Embankments have complex shapes and are made by multiple materials. Finite Element Method (FEM) and other numerical methods are efficient ways to solve the forward problems of complex objects such as embankment. This article introduces how to use ANSYS to build a 3D embankment model and simulate the detection of internal erosion. We simulated the process of detecting a seepage channel in embankments by Wenner arrays and list the simulation results and parts of the APDL source program. ANSYS and APDL are very suitable tools to rapidly solve the forward problems of complex objects, such as embankment.
Design Model of the Tunnel Axis and its Algorithm Implementation
Authors: Li Yue Qiang , Liu Ya Ke
Published: September 2011

With a large number of construction projects building in urban rail construction, it’s very necessary for researching on the construction axis. Construction axis of the subway is consisted of line segment, circular arc segment and transition curve. The paper introduces design models and algorithms of the tunnel boring machine (TBM) axis (DTA). By analyzing the DTA characteristics of each curve, summing up their general characters, we ultimately make a unified common algorithm and geodetic coordinate calculation model of the design axis in horizontal and vertical planes. It will be very useful for the process of underground construction.
Intelligent Displacement Measuring System for Rock Stratum
Authors: Li Feng Ling , Rong Jian Hua , Zhang Yu Ping
Published: September 2011

Measuring rock stratum displacement in dam grouting process is very important. A new displacement system is designed, comprising a programmable microcontroller Atmega16, a new grating capacitive displacement sensor(GCDS), DS1302 real time clock chip and announciator etc. The system has high sampling rate of 9600 baud rate and can trap the displacement equal to 0.001 millimeter in one second. Equipped with mechanical conveyance system, the system can be applied to the civil engineer. The experiment results show the instrument can measure accurately the displacement value and alarm geologic disaster in time, which can conduct continuous and accurate monitoring and provide operation decisions for dam engineers.
Measurement in Social Life - Toward More Efficient User Interface
Authors: Seiichi Serikawa , Yamawaki Akira
Published: September 2011

A precision instrument and measurement technology is very important for the sensing systems to correctly perform the decision-making, extract the material, measure the distance, and so on. Also, an efficient user interface and the available and cheap devices are needed to spread the sensing system developed. As a result, more comfortable social life must be provided. This paper pays attention to the wireless remote controllers of the sensing systems, which exist around us ubiquitously but recently are becoming complex and various. Especially, the handicapped people or the elderly people are hard to operate the complex wireless remote controllers. This paper introduces our researches tackling these problems. The researches are mainly divided into two aspects, which are the generalization and customization and the utilization of the natural human actions. The first one tries to cope with both the generalization and the customization which are mutually exclusive. The generalization frees the developers from providing their own controllers and releases the users from having many different controllers. The customization provides their own controllers as the users like. The second one attempts to realize the operations by the natural human actions to provide the easy and intuitive controllers. Some case studies are shown. The further advances of the user interface for the sensing systems will provide more comfortable social life.
Person Localization System Using Privacy-Preserving Sensor
Authors: Nakashima Shota , Lu Hui Min , Miyata Kohei , Kitazono Yuhki , Seiichi Serikawa
Published: September 2011

A privacy-preserving sensor for person localization has been developed. In theory, the sensor can be constructed with a line sensor and cylindrical lens because only a one-dimensional brightness distribution is needed. However, a line sensor is expensive. In contrast, CMOS area sensors are low cost and are increasing in sensitivity according to recent rapid advancement in the technology. Therefore, we covered the CMOS area sensor physically so that it behaved as a line sensor, we substituted CMOS sensors for the line sensors in practice. The proposed sensor obtains a one-dimensional horizontal brightness distribution that is approximately equal to the integration value of each vertical pixel line of the two-dimensional image. It is impossible to restore the two-dimensional detail texture image from one-dimensional brightness distribution, although it obtains enough information to detect a person’s position and movement status. Thus, the privacy is protected. Moreover, the appearance of the proposed sensor is very different from the conventional video camera, so the psychological resistance of having a picture taken is reduced. In this work, we made the privacy preserving sensor practically, and verified whether a person’s state was able to be detected. The simulation results show that the proposed sensor can detect a present person’s state responsively without violating privacy.
Extraction of the Region Feasible for Safe Ambulation from Head-Mounted Wearable Camera Images Employing Genetic Algorithm on Homography Constraints
Authors: Orii Hideaki , Tominaga Keitaro , Kawano Hideaki , Maeda Hiroshi , Ikoma Norikazu
Published: September 2011

The objects have potentially dangerousness for pedestrians, such as illegally-parked bicy-cles, power poles, stopping vehicles, etc., could be found in a street. Those objects are threats to thesafety of elderly and disabled people with impaired vision, because it is difficult for them to find thoseobjects. In this paper, to enhance the elderly and disabled people's mobility, we propose the methodto estimate the region which is feasible for people's mobility in life space. In this method, the imagesare obtained from a head-mounted wearable camera, and the suited region for walking is estimatedusing 3-dimensional analysis and genetic algorithm. The performance and the validity are shown byapplying the proposed method to a number of scenes in life space.
Character Detection and String Identification on a Signboard in Scene Image Based on Criterions of Segmented Images
Authors: Kawano Hideaki , Orii Hideaki , Maeda Hiroshi
Published: September 2011

In this paper, a method which specifies the signboard region and extracts the charactersinside the signboard is proposed.We usually take notes not to forget what we should leave to memory.But it is often that the task is too troublesome. Our aim is the development of a new input-interface soas to input texts froma picture.Most of signboards are composed of almostmonochromatic region. Onthe basis of this observation, image segmentation using color information is applied, and then we getsome binary images by applying threshold for each segmented region. Each binary image is enclosedby the smallest circumscribed square. The signboard region is specified according to distribution andarea of the white pixels inside the square. As a result of experiment, we confirmed the effectivenessof the proposed method.
Actual Image Effect Creation According to a Real Lens Imaging System
Authors: Zhang Li Feng , Lu Hui Min , Kitazono Yuhki , Seiichi Serikawa
Published: September 2011

Nowadays, digital imaging device has become a popular item of our daily life. Even a cell phone can gives a high density image. People can enjoy taking a photo at anytime and anywhere, but such a mechanically simplified imaging device usually cannot mount an optical lens filter. Therefore the digital filtering effect is needed. Many image effect filters have been released by image processing soft maker or digital camera manufacture, but most of them were made just for funny, the resulting image is unnatural. This research focuses on the digital filtering effect, and it is realized according to a real optical lens imaging system. In this work, we prepared several optical filter lenses, and take photos with or without using them. Assuming the photo without using a filter is the real object, and then the photo using the filter is the observed filtering image, the digital filter can be derived by a division theoretically. Using these digital filters, the resulting filtering images are gotten. From these result, we find that some of the filtering effect is good, but some of the effects were not enough. Therefore, assuming the cause of these problems from the experimental results, show the direction for future research such as improving experiment approach or adopting nonlinear algorithms is also attempt.
Integration of Smart Materials by Incremental Forming
Authors: Brenneis Matthias , Türk Markus , Groche Peter
Published: September 2011

Today, the components of smart structures consisting of structural and smart materials are generally produced separately and assembled in additional processes afterwards. An alternative approach, which combines the forming of metallic parts and the assembly of the structures in one process step, is proposed in this paper. Incremental forming processes are applied for this operation. Significant joining mechanisms will be analyzed and some applications of this combined forming and assembly process are shown. As sensors, smart components allow a monitoring of appearing loads, as actuators they allow an active influencing on appearing disturbances. The research contains numerical analyses and experimental tests.
Fatigue Life Estimation under Cyclic Loading Including Out-of-Parallelism of the Characteristics
Authors: Kurek Marta , Łagoda Tadeusz
Published: September 2011

The paper presents an algorithm of fatigue life determination for materials with no parallel fatigue characteristics under pure bending and pure torsion. The presented model uses the iteration method, and the applied fatigue criterion is function of the ratio of normal and shear stresses coming from bending and torsion, respectively. Three materials were applied for analysis: CuZn40Pb2 brass, 30CrNiMo8 medium-alloy steel and 35NCD16 high-alloy steel.
Ontology-Based Information Model for the Exchange of Uncertainty in Load Carrying Structures
Authors: Sprenger André , Haydn Michael , Ondoua Serge , Mosch Lucia , Anderl Reiner
Published: September 2011

Knowledge about future process properties is crucial for the development of safe and economic products with load carrying structures. Real processes are influenced by uncertainty what causes scattering and deviation from assumed values. As a consequence, products are often oversized or even product failures can occur. To control uncertainty, extensive knowledge about future processes is necessary in the development process. This paper shows an approach for the representation of uncertainty in production-and usage-processes, according to scattering properties and their cause and effect relations. This approach is used as a common platform for storing, locating, comparing and reuse of knowledge about uncertain properties and their relations. The core of the proposed approach is an ontology-based information model with the ability to represent different levels of trusted information in relation to process parameters and cause and effect relations.
An Approach of Design Methodology and Tolerance Optimization in the Early Development Stage to Achieve Robust Systems
Authors: Steinle Philipp , Bohn Martin
Published: September 2011

In the early stages of the vehicle development basic decision for the future vehicle concepts are made. Anyhow not all information for a confirmed decision, especially in the field of tolerance management, is available at that time. Known methods to estimate the impact on the final product normally require determined concepts and nearly completed parts and are thus not feasible to find new solutions. One solution to overcome this problem is the consequent use of design methodology. Combined with tolerance aspects the result of the process is a robust concept for all following process steps.
Spatial Soil Pressure Test and Calculation Analysis of Sheet-Pile Wall
Authors: Deng Zong Wei , Liu Xi Ling , Leng Wu Ming
Published: September 2011

The conventional methods used in the design of sheet-pile walls are based on the limit equilibrium approach. Due to a flexible retaining system, the choice of soil pressure needs to be further studied. Test about sheet-pile wall was carried out on typical site. Soil pressure distribution rules on horizontal and vertical direction were revealed by comparing the on-site measured and numerical data with classical soil pressure data. The results show that: the soil pressure resultant force of anchored sheet-pile is close to static soil pressure, and its action point is 0.43~0.44, higher than the static soil pressure (0.33). The resultant force and its action point of soil pressure of cantilever sheet-pile wall are close to the ones of coulomb soil pressure. In horizontal direction, there present “arching effect” on this two kinds of sheet-pile walls. Therefore, the current soil pressure calculation methods of sheet-pile walls should be revised according to different types, and an amended calculation method of soil pressure was proposed in this paper.
Experimental Research of Bottom Chord Splice Joints with Variable Cross-Section in Steel Roof Truss
Authors: Wan Hong Xia , Yan De Xu , Wang Xiao Ping
Published: September 2011

A workshop’s roof is designed to use steel tube trusses with the span of 24m. There are three kinds of variable cross-section splice joints of the roof truss bottom chord. Nine splice joint specimens, three for each kind, were tested to obtain their tension capacity and failure modes. A special test setup is designed to introduce the tension load to the splice joint specimen. The paper detailed introduced the test setup and method, discussed the failure load and failure mode of the joints. Experimental research indicated that the bottom chord splice joint with variable cross-section of the roof is safe, reliable, having high bearing capacity. The research also validated the correctness of the design and calculation, and provided the basis for the application of such joints in the engineering practice.
The Analysis on the First Order Vibration Frequency of Post-Tensioned Unbonded Pre-Stress Concrete Beam
Authors: Ma Jin Bo , Wang Li Jun , Tang Ting
Published: September 2011

In order to study the influence on structural vibration from pre-stress and eccentricity, a experiment is designed. After analyzing the experimental results of 9 groups of modal tests on a post-tensioned unbonded pre-stress concrete beam, the following conclusions can be drawn: The influences on first order vibration frequency which are caused by eccentricity and pre-stress really exist. The rules of influences brought about by eccentricity and pre-stress on first order vibration frequency are complicated. When the eccentricity is close to the centroid, the linear correlation between the pre-stress and the first natural frequency will be good, on the contrary, the nonlinear will be strengthened. The first order vibrational frequency of the tested beam will go up with the increase of pre-stress.
Reliability-Based Robust Optimization Design for Rubbing Rotor System
Authors: Su Chang Qing , Li Le Xin , Zhang Yi Min
Published: September 2011

Based on the reliability-based optimization design theory, the reliability sensitivity technique and the robust design method, the reliability-based robust design of rubbing rotor system is extensively discussed and a numerical method for reliability-based robust design is proposed. The reliability sensitivity is added to the reliability-based optimization design model and the reliability-based robust design is described as a multi-objection optimization. On the condition of known first four moments of basic random variables, the respective program can be used to obtain the reliability-based robust design information of rubbing rotor system accurately and quickly using the fourth moment technique. According to the numerical results, the approach proposed is a convenient and practical reliability-based roust design method.
Lattice Light Steel Frame System and Application
Authors: Ding Bo , Jiang Huan Qing , Wan Hong Xia , Zhang Feng
Published: September 2011

Lattice light steel frame is a new type of structural system, combining general steel framework which is composed of lattice column and lattice beam with lattice light steel keel of the partitions and floors, the system takes full advantages of both structural systems, with high speed construction, less steel consumption, good earthquake-resistance etc., and possesses good prospects. The paper describes the system construction approach and the characteristics of lattice light steel frame system, and provides a project example of a villa. The design method and calculation model of the project are presented. Calculation results meet the specifications’ requirements, proving the new system can be applied to practical engineering. The paper gives guidance for application and research of this new system.
Cable Tension Test Research of Short Boom
Authors: Wang Wei Feng , Yuan Jun Tao , Zhang An Lin , Li Meng
Published: September 2011

For present-day bridges.cable tensions test is a vitally important job in course of construction.The tensions condition of cables plays an especially important part in the course of construnction and operation.In order to ensure the safety of operation and lengthen the service life,the exact testing result is being required to obtain.In cable stayed bridges and arch bridges, the boundary condition as well as the bending rigidity has an greater effect on the cable forces testing of the short boom.This paper based on Additional Mass Method,using the method of GA-BP Neural network after Genetic Algorithm optimization to identify the cable forces of short boom and a preferable research result is obtained.
Nonlinear Analysis of Behaviors of Steel-Concrete Composite Beams with Slipping
Authors: Wang Wei Feng , Zheng Guo Qing , Huang Bei Bei
Published: September 2011

This paper has the background of JiuJiang bridge recover engineering, and uses the approach that combining submodel method with finite element method to establish the simplified model of the whole steel-concrete composite beam bridge without considering slipping and the refinde model of the typical section with considering slipping. The distribution of slipping of steel-concrete composite beam under the condition of operation is researched. In addition, the deflection as well the stress of typical section between the two kinds of models is contrasted and analyzed. Based on these researches, this article uses the Midas Civil to study the creep effect of steel-concrete composite beam cable-stayed bridge.
The Aging Rules of Asphalt and General Study on RAP
Authors: Zhang Xing Ying , Sun Dong Yu
Published: September 2011

With China's rapid economic development, transport markets are booming. High way, especially expressway plays a very important role in economic development of today. Asphalt pavement surface is widely used. And with the development of expressway, more and more recycled asphalt concrete will be produced. So how to deal with these waste materials becomes a focus problem among researchers. In this paper, aging rules of asphalt according to the engineering practice and test data was talked about. The aging can be divided into: aging during transport, storage, and heating, aging during hot-mixing and paving, aging during the operation of the pavement. At the same time, the general knowledge about the regenerated asphalt was discussed. In addition, the possible damage of RAP technique to environment was also discussed.
Reliability Analysis of RC Freely Supported Beam Bridge with Intermediate State and Failure-Dependence
Authors: Zhang Peng , Hou Chuan Jing , Li Ming
Published: September 2011

According to the degradation in strength and deformation of structure with intermediate state and failure-dependence, an assessment of seismic reliability of bridge engineering structures is brought forward, which assumed there is a three-stage work mode of safety, intermediate and failure. Freely supported beam bridge is reduced to serial parallel systems. Using base shear of piers and displacement of girders as calculation indexes, models of three-levels of reliability vector are put forward to calculate the reliability vector of piers, girders and bridges respectively. A practical method for dealing with failure-dependence of anti-seismic engineering systems is put forward by considering dependence parameter. The reliability of RC freely supported beam bridge can be effectively predict by the proposed approach. It provide theoretical basis for the assessment of seismic performance and offer accurate datum that are needed for the reinforcement of bridge, so the potential disaster of lifeline engineering can be prevented or decreased.
Calculation of Hongdu Bridge Foundation Construction
Authors: Song Jin Bo
Published: September 2011

Hongdu Bridge is an extraordinarily huge bride across northern branch Ganjiang River, in the city of Nanchang. Main tower adopted single column slanted pylon space twist face back cable structure. Its construction is based on double-wall cofferdam method. The paper discuss thecalculation of key step and key position for the key technology in terms of double-wall cofferdam and platform underwater construction, Which include the design of the base construction and double-wall cofferdam,steel cofferdam construction, the calculation and checking of the cofferdam and so on. The whole length of 9.5 km, except the starting period of about 2.4 km for roadbed type, the other sections of approximately 7 km. The project always invests about 18 Billion yuan.
Dynamic Assessment about Simple-Supported Girder Bridge
Authors: Li Wei Zhao , Wang Zong Lin , Sun Da Wei
Published: September 2011

The objective of this study is to introduce a dynamic assessment method about simple-supported girder bridge .This paper introduces the dynamic test contents, test methods, test results and the assessment index. The dynamic tests included ambient vibration tests which were used to identify the bridge modal parameters and forced vibration tests based on controlled traffic loads which were used to obtain the and vibratory response. The analytical results showed that the dynamic performance was in good condition and the bridge had great potential of carrying capacity. This method provided effective means for the assessment of the existing simple-supported girder bridge.
Study on Forecasting the OD Volume of Railway Luggage and Parcel
Authors: Li Xue Fei , Lang Mao Xiang
Published: September 2011

The OD volume of railway luggage and parcel on Beijing-Guangzhou Corridor is forecasted by using the gray model and the gravity model. According to the historical statistical data, firstly the sending and arrival volume of railway luggage and parcel of the major cities on Beijing-Guangzhou Corridor is forecasted by applying the gray model and it takes the Beijing volume of railway luggage and parcel for example to show the calculative process. Secondly, by using the least squares method to calibrate the sample data, obtain the value of each coefficient to be determined, get the calibrated gravity model and then the OD volume of railway luggage and parcel is forecasted by adopting the gravity model. Finally the rationality of the forecasting results is analyzed and the forecasting results which can be used in the railway luggage and parcel organization work have a high accuracy and meet the actual needs.
Study on Deformation of Tunnel with Underlying Coal Mining
Authors: Yan Zhi Gang
Published: September 2011

Coal mining can cause the strata distortion and surface subsidence. With infrastructure construction scale in our country enlargement, the case of approaching excavation caused by coal mining is increasing and more complicated. The calculation method of current regulations is too simple and don't conform to the present coal mining technology, so it will cause serious waste of resources. By using numerical simulation, this paper regards the influence of coal mining on the above tunnel as approaching excavation problem and studies the tunnel deformation law with three different coal mining mode. Based on the analysis and calculation, this paper proposes measures to ensure that the coal seam mining and tunnel's safety. The result indicates the more smaller the dip angle of coal block the more larger the displacement and the deformation range of tunnel. The most effective method for decrease deformation is the backfill method. If the conditions are permitted, backfill method is the preferred method and longwall caving method is last.
Seismic Design and Analysis of Large-Size Shield Tunnels. Part I: Parametric Study
Authors: Liu Li Yu , Chen Zhi Yi , Yuan Yong
Published: September 2011

According to the extensive application of shield tunnel, large-diameter shield tunnel in particular, structure stiffness of shield tunnels varies in a large rang. In this paper, shield tunnels with different diameters and thicknesses are analyzed and calculated by time-history method. Stiffness ratio is identified to measure the relationship of structure’s stiffness and soil’s stiffness. The results indicate that dynamic moment and shear forces of shield tunnels have positive correlation with the stiffness ratio. Axial forces have positive correlation with thickness and diameter of lining structure.
Overburden Rock Stability Analysis of Shallow Tunnel
Authors: Wang Yun Long , Tan Zhong Sheng
Published: September 2011

As for shallow tunnels through the rock layers, the stability of the overburden rock has a decisive role on the tunnel stability; furthermore, analyzing the stability of the overburden rock is very important to the supporting design and the choice of excavation method. Method of elastic foundation beam is used to research the moment of overburden rock, and the formula of overburden rock stable thickness is finished. Seven sections of JIAOZHOU Bay Subsea Tunnel are took for example to analyze the safety factor of different span and overburden rock thickness, then the stability of overburden rock is analyzed. The results show that the overburden rock safety factors of these seven sections of JIAOZHOU Bay Subsea Tunnel are range from 0.65 to 0.85. Compared with the experimental results, theoretical analysis of the results are more consistent The actual example verifies that the overburden rock stability in this paper is feasible.
Seismic Design and Analysis of Large-Size Shield Tunnels. Part II: Modified Stiffness Solution
Authors: Liu Li Yu , Chen Zhi Yi , Yuan Yong
Published: September 2011

According to the extensive application of shield tunnel, large-diameter shield tunnel in particular, a simplified seismic design method is in urgent need. The equivalent static method is more suitable for the rigid underground structure, rather than flexible structure such as large-diameter shield tunnel. In this paper, shield tunnels with different diameters and thicknesses are analyzed and calculated by time-history method and free field deformation method. The calculation and analysis above help to identify the stiffness ratio to measure the relationship of structure’s stiffness and soil’s stiffness and the derivation of a revised stiffness solution based on the free field deformation method. The results indicate that this method can calculate seismic stress of shield tunnels with different diameters and thicknesses accurately.
Analysis of Shield Tunnel for Water Conveyance Based on the Interface Element Method
Authors: Zhang Qing , Wang Zhi Qiang
Published: September 2011

The shield tunnel for water conveyance is usually composed of two-layer liner tube. The outer layer is fabricated reinforced concrete structure consisting of the sectors of liner tube which are connected by binder bolt, and the inner layer is liner tube of depositing reinforced concrete. Under the action of inner and outer water pressure, there will be some discontinuous deformation on the crack sections and the interface between liner and soil, which bring great difficulty to the establishment of the model. Based on the interface stress element theory of discontinuous mechanics, this paper has proposed a computing model of shield tunnel for water conveyance in accordance with the project of transporting water through Yellow River for diverting water from the South to the North. This model can reflect the discontinuous deformation characteristics of various cracks. The effects of binder bolt and reinforced bar can also be well simulated. The theoretical analysis and practical computation results show that the model suggested in this paper is effective in simulating and computing, thus being regarded as an ideal model of shield tunnel for water conveyance.
Model Test and Study on Pile Foundation in Transversely Isotropy Clay
Authors: Zhu Zan Cheng , Guo Fan Bo , Jiang Feng Hua , Wang Xiao Gang
Published: September 2011

To further verify the feasibility of theoretic calculation, according to similarity theory, the principles and methods of pile foundation-soil interaction in saturated soft clay are determined. It studies acceleration interaction of each test point on the soil surface under the same largest shock force with different frequency on the top of the pile. The results of experiment show that the acceleration interaction trend of each point changes with the change of shock frequency, it shapes like a down N with the shock frequency of 5Hz, like an M with the shock frequency of 10Hz, like a down V under the shock frequency of 15Hz～30Hz. With the shock frequency of 40Hz and 50Hz, it likes a plane curve (hyperbolic curve) shape.
Shear Modulus and Damping Ratio of Gravel Material
Authors: Zou De Gao , Gong Tao , Liu Jing Mao , Kong Xian Jing
Published: September 2011

Two of the most important parameters in dynamic analysis involving soils are the dynamic shear modulus and the damping ratio. In this study, a series of tests were performed on gravels. For comparison, some other tests carried out by other researchers were also collected. The test results show that normalized shear modulus and damping ratio vary with the shear strain amplitude, (1) normalized shear modulus decreases with the increase of dynamic shear strain amplitude, and as the confining pressure increases, the test data points move from the low end toward the high end; (2) damping ratio increases with the increase of shear strain amplitude, damping ratio is dependent on confining pressure where an increase in confining pressure decreased damping ratio. According to the test results, a reference formula is proposed to evaluate the maximum dynamic shear modulus, the best-fit curve and standard deviation bounds for the range of data points are also proposed.
Application of LDV in Vibration Analysis of Satellite Solar Panel
Authors: Zhao Ting Ting , Wang Ming Jian , Wu Jian Ping , Song Yun Feng
Published: September 2011

Satellite solar panel bears with crucial responsibility in supplying energy while satellite orbits the moon. Through analyzing the vibration mode of solar panel, the structure’s natural frequency and inherent vibration vector can be obtained, which is of vital importance to structure dynamic modification, structure optimization design and fault diagnosis.This article summarizes the experimental results and analysis of solar panel under vibration with the aid of LDV. Through binary channel fast Fourier Transform (FFT), combined with modal analysis theories and software analysis system, a modal model of solar panel is built. Such an modal model provides a basis for the determination of the physical and structural parameters in the solar panel design of a satellite and provides an analysis method for the reliability validation of the design and the operating reliability of the satellite.
Performance of Floating Piles for Supporting Embankments in Soft Soils
Authors: Cao Wei Ping , Zhao Min
Published: September 2011

Reinforced concrete piles are often used to support highway embankments in soft soils. The performance of floating piles differs significantly from that of end-bearing piles. A numerical analysis was conducted to investigate the soil stress concentration ratio, pile and soil settlements, pile axial force, negative skin friction (NSF) and the location of the neutral plane (NP) during embankment filling and consolidation of soft soils when the soft soils is treated by using reinforced concrete floating piles. The results indicate that the pile axial force as well as negative skin friction is closely time dependent and increase much more quickly during the embankment filling than during the consolidation. The location of the NP exhibits a complicated variation as the pile head loads and the surcharge applied on the soft soils are varying with time. Most of the embankment load is born by pile for the existence of soil arch within the embankment.
Study on Seismic Permanent Deformation of Earth Rock Fill Dam
Authors: Zhou Guo Bin , Zhao Jian Ming , Wen Yan Feng , Yang Zheng Quan
Published: September 2011

For the flaw of safety evaluation system using safety factor as control index, seismic permanent deformation is used to evaluate the safety of earth rock fill dam. In this study, the seismic deformation of Zipingpu dam after Wenchuan earthquake is measured and analysis. The deformation in the middle of the riverbed on the crest is the largest. The deformation in the left dam abutment is smaller than that in the right. The seismic permanent deformation on the crest grows rapidly in the first three days, and then develops slowly. The results show that deformation grows along the height of dam with the relation of exponential or power function.
Research on SCS-CN in Lanhe Basin Distributed Rainfall Runoff Event
Authors: Yang Mei , Sun Xi Huan
Published: September 2011

Based on the data from Basin hydrology, weather, runoff, land use, soil, DEM and with ARCGIS9.0 and WMS7.0 applications, SCS small basin hydrological model can be applied in Lanhe basin Distributed Hydrological Model. Within each sub-unit, net rainfall can be calculated with SCS-CN, and conflux using SCS dimensionless unit hydrograph, while river network flow concentration using subsection Muskingum method. By conducting the simulation of distributed rainfall runoff where measured runoff value are selected from 20 historical flood, the results indicate there are 14 values that are effective and the ratio comes to 70 percent. And there are 11 effective values after conflux test to the 14 floods where the ratio comes to 80 percent. The process of calculating runoff matches well with actual measure which indicates that the Distributed Hydrological Model is a scientific and precise model and can be applied to basin water flood forecast and water resource management.
Dynamic Response of Underground Structure under Vertical Earthquake Action
Authors: Sun Chao , Wang Qing
Published: September 2011

The research of stability of underground structures under earthquake action is one of the hot topics in Geotechnical Engineering researches .Through numerical simulation the article studies the dynamic response rules of the underground structure under vertical earthquake action. The result shows that under vertical earthquake action the vertical stress on the roof and bottom plate of underground structure and the same depth in the earth both increases, and the vertical stress on the roof and bottom plate of underground structure is much higher than that on the same depth in the earth (above two times); under vertical earthquake action the underground structure experiences greater vertical stress from time to time, and produces vertical compressive deformation, and sometimes it completely separates from the above soil layer.
Study on Embedded Pile Length in Slope Reinforced
Authors: Liu Qiu Sheng , Liu Dong Feng
Published: September 2011

The embedded length of anti-slide piles reinforcing slopes is analyzed by three-dimensional elasto-plastic shear strength reduction finite difference method. The effect of embedded pile length on safety factor and pile behavior, and the effects of the pile spacing, pile head conditions, bending stiffness and soil style on pile length and pile behavior are analyzed. The results show that the pile spacing and the pile head conditions have significant influence on the critical pile length. The critical pile length is seen to increase with decreasing pile spacing, and smaller pile spacing tends to increase the integrity of the piled slopes. A theoretical analysis of the slip surface is also described, and the slip surface determined by the pressure on piles considering the influences of both soil and the piles of slopes is in agreement with previous researches.