bluuebunny/crossref_metadata_2025 huggingface dataset:
Study on Strength and Stiffness of Special-Shaped SRC Columns
Authors: Luo Ming Zhi , Du Jia Zheng , Cao Wan Lin
Published: November 2012

SRC (Steel Reinforced Concrete) columns have a very broad application in the construction industry, and their cross-section combined forms are becoming more and more diverse. To solve the strength and stiffness problem of special-shaped SRC columns fast and accurately, the formulas of bending stress and bending deflection of special-shaped SRC columns were derived based on plane assumption from the bending experiments of SRC columns. For the problem with a eccentric force, the formula of normal stress from axial force was derived and added to the bending stress. Based on the formulas, the program is implemented to calculate the bending stress and bending deflection of special-shaped SRC columns. The example results showed the formulas are simple and reliable, and have certain engineering meanings and theoretical value.
Pushover Analysis of Eccentric High-Rise Single-Tower Building’s Frame-Shear Wall Structure
Authors: Cheng Xiao Jie , Tai Yun Chao , Jia Li Li
Published: November 2012

High-rise building with podium is a common seen architecture style in China. Nowadays more designers inclined not to separate the main and podium, but this would lead to the eccentric between the center of mass of the tower and base, which may exceed the code requirement when the ratio of offsetting is larger than 20% and cause complicated seismic response. This paper takes an eccentric high-rise frame-shear wall structure of single tower as example, analyze the inelastic performance of this structure under rare earthquake by Pushover method, and point out the weak parts of the position by the distribution and development of plastic hinges.Draw the structure inelastic response indicators in the rare case of earthquakes, and point out the weak parts of the structure of the distribution and development of plastic hinge (region), put forward reasonable proposals for optimizing the structure design.
The Bottom-Up Underpinning Construction Technology for Base Isolation Reinforcement of the Existing Masonry Structure
Authors: Zhang Fu You , Pei Meng , Mao Li Jun , Dong Yu Yong
Published: November 2012

Base isolation technology is a new effective way in strengthening and reconstruction projects for the existing buildings. Underpinning technology is to shift the base force from upper structure to isolation layer bearings in strengthening process. How to implement the underpinning technology is the key of base isolation reinforcement for masonry structure. A bottom-up underpinning construction technology and construction procedure for base isolation strengthen design is put forward in this paper. Based on the study of a primary school masonry building, the isolation reinforcement design by using bottom-up underpinning technology is introduced, afterwards, structure dynamic response is performed by dynamic time history analysis with the finite element analysis software Etabs. The result shows the advantages of this new technology compared with conventional reinforcement method for similar works reference.
Identification of Nonlinear Parameters of Rubber-Bearing in Base-Isolated Building
Authors: Lei Ying , He Ming Yu
Published: November 2012

The research about base isolation in building construction in the region of medium risk seismicity has now received great attention. Seismic behavior of base-isolated structures is highly dependent on the nonlinear properties of the rubber-bearing isolated system. Thus, it’s very necessary and significant to identify the nonlinear properties of the rubber-bearing exactly with suitable method. In this paper, a data-based method solely using the time series of structural dynamic response and excitation measurements is proposed to identify the nonlinear parameters of rubber-bearing isolated system. The method is based on the sequential application of extended Kalman estimator for the nonlinear structural parameters. A numerical simulation results demonstrate that the proposed method is capable of identifying the nonlinear parameters of rubber-bearing isolated system with good accuracy.
The Study on Environmental Evolved Characteristic of Sandy Coast
Authors: Zhang Qi Peng , Han Xiao Qing , Li Jing , Zhao Jing Jing , Zhou Wei Biao , Gao Wei Ming
Published: November 2012

In order to study the evolved characteristic of sandy coast in Hebei Province, the paper analyzed costal information by Remote Sensing technology from landform maps and remote sensing images from 1956 to 2007. It studied the evolvement characteristics and the reasons of sandy coast deeply. And it also analyzed the evolvement infections to the nearby coast of the sandy engineering. The results showed that the characteristic was erosion condition in sandy coast. There were several different evolved processing in different area from 1959 to 2007. In the region between Daihe River and Tazigou, the highest erosion speed was 3.45 m/a by the coastal current and wave between Daihe River and Yanghe River. The section was deposited into the ocean with the speed of 1.29 m/a by the cultivation ponds building in Bohai Sea farmland between the Yanghe River and Dapuhe River. In the region between Tazigou and Langwokou River, the beach had been eroded about 373 m with the speed of 13.32 m/a by 2007. And the section was eroded offshore more serious with the distance of 610 m and the speed of 21.79 m/a from the north of Luanhe River.In the region between Langwokou River and Daqinghe River, the average erosion distance was about 370 m with the speed of 13.21 m/a in Shegang sandbar. And it was eroded back to mainland about 164 m with the speed of 8.20 m/a. And it was about 504m with the speed of 18.00 m/a.
Stability Analysis of the Radiant Cable Suspendome
Authors: Kang Jian , Liu Xiang Yu
Published: November 2012

Radiant cable suspendome based on single-layer lattice shell is proposed in this paper whose cable-strut system is like that of Radiant Beam String Structure, the purpose of this paper is to do stability analysis of the structure.The linear buckling analysis of the hybrid structure and the single-layer lattice shell who has the same geometry parameters is carried out, we can preliminarily understand the stability of the hybrid structure. At the same time, nonlinear buckling analysis is carried out to study the stability of the hybrid structure under different rise-span ratios, different prestress level and half-span load. The results show that the introduction of prestressed cables greatly improve the structure's stability and reduce the structure sensitivity to original geometrical imperfection.
Component Modeling of Steel Bolted End-Plate Joints under Bending and Shearing Loads
Authors: Zhang Jin Fan , Wang Zhen Yu , Jiang Jian Qun
Published: November 2012

Based on the component method of EuroCode3, a new component model to evaluate rotational properties of extended end-plate beam-to-column joints under shearing and bending loads has been proposed in this paper. Firstly, the T-stub model was set up. And then the end-plate beam-to-column joint was simplified with a set of T-stubs. Finally the end-plate beam-to-column joint was simulated by the proposed component model consists of a series of levers and equivalent springs. With the purpose of verifying and calibrating the proposed model, an experiment of extended end-plate joint is recommended and a corresponding finite element model has also been set up. Results of experiment, FEM and component model fit well each other. The method of this paper can describe the rotational property of end-plate joint under beading moment and shear with enough precision, which can be a useful improvement to conventional design codes.
Design of Cold-Formed Thin-Walled Steel Fixed-Ended Channels with Complex Edge Stiffeners under Axial Compressive Load by Direct Strength Method
Authors: Wang Chun Gang , Ma Ping , Song Dai Jun , Yu Xin Yong
Published: November 2012

The stability bearing capacity of axially compressive loaded fixed-ended channels with complex edge stiffeners were analyzed by direct strength method in this paper. A total of 292 examples with different parameters were selected to be studied by nonlinear finite element analysis. As the members with fix-ends, the failure modes include local and flexural-torsional interactive buckling, distortional and flexural-torsional interactive buckling. The revised direct strength method was put forward. After revise, the formula is in good agreement with experimental results. It is shown that direct strength method is valid for predicting the stability capacity of axially loaded fixed-ended channel columns with complex edge stiffeners. We suggest using the DSM3 to calculate the cold-formed thin-walled steel fixed-ended channels with complex edge stiffeners under axial compressive load.
The Effect of Group Number and Group Coupling Stiffness on Vibration Response Localization in Tuned Grouped Blade-Disk
Authors: Wang Ai Lun , Long Hui , Huang Qiang , Wang Qian Jin
Published: November 2012

The group number and group coupling stiffness are important structural parameters of the grouped blade-disk. This work examines how the group number and group coupling stiffness affect the vibration response localization of tuned grouped blade-disk. The lumped parameter model of the grouped blade-disk was established, and the vibration equation was derived. The vibration response localization factors of tuned grouped blade-disks were obtained at the different group number and group coupling stiffness, and the effects of group number and group coupling stiffness on vibration response localization was analyzed. The results show that the vibration localization appears in the tuned grouped blade-disk and the degree of vibration response localization reduces with the increasing of group number and group coupling stiffness. The results can help to completely reveal the localization mechanism of the grouped blade-disk
Force Analysis of Ring Gate Based on ANSYS
Authors: Hu Xiu Cheng
Published: November 2012

Ring gate of Ahai hydropower Station is known to the highest ring gate in the world. In this paper, it is calculated to the driving loads of the Ahai ring gate by six hydraulic servomotors during a closure without automatic control (i.e. in case of a breakdown of the electrical control system), analyzed the behavior of the operating system of the ring gate closure with the water discharge and closure with three wicket gates not synchronized (i.e. three wicket gates remained accidentally in open position), and finally shown to how the 6 servomotors are synchronized on the basis of the driving loads. There are proved to The feasibility and the credibility of this system of ring gate by using ANSYS to a case.
The Analysis of Dynamic Characteristics for the Powerhouse Structure of the Riverbed-Hydroelectric Station
Authors: Peng Xuan Mao , Song Zheng Xiang , Jiang Lin
Published: November 2012

The paper creates a three-dimensional finite element model with the Xihe Project on the Hanjiang River as a background. The space integrated finite element method is applied to analyze the dynamic characteristics of the spatial structure of the riverbed-hydroelectric station. The aim is to calculate and analyze the free vibration characteristics of the whole structure, the dynamic displacement and the dynamic stress under the two typical conditions. The calculation model is effective to consider the interaction of the upstream dam section, the main and auxiliary powerhouse and the downstream water retaining structure, as well as the foundation. The results obtained will be a valuable reference for optimizing the dynamic characteristics of the powerhouse structure of riverbed-hydroelectric station and improving the engineering design.
The Calculation of Landslide-Thrust Based on Reliability Theory
Authors: Wu Ying Xiang , Liu Dong Sheng , Wang Lei , Xin Qian
Published: November 2012

For current engineering of anti-slide piles, many problems exist in the calculation of landslide-thrust. Therefore, a new method based on the reliability theory combined with strength reduction FEM is introduced, and the landslide-thrust acting on anti-slide pile is researched here. In this method, the safety factor of slope can be caculated without assuming the shape and position of failure surface beforehand, the randomness of physical and mechanical parameters of slope are introduced, and the combined action of retaining structure and rock mass is considered. Meanwhile, the thrust distribution form and structural internal force can be calculated, which are also probabilistic. A case study shows that the calculation results are more reasonable and the applicability of proposed method is clearly dependable in calculating the landslide thrust.
Flow-Induced Vibration Study of Tunnel Spillway Working Gate on One Reservoir
Authors: Wang Xin , Luo Shao Ze
Published: November 2012

In order to study the flow-induced vibration of the spillway tunnel working gate of one reservoir, hydraulic model test with scale 1:20 was conducted to obtain the dynamic pressure characteristics on the working gate. Experiment modal analysis method was employed to identify the structure dynamic characteristics through the 1:10 working gate mode test. The 3D FEM model of the gate was built to simulate the vibration response of the structure. The research showed the low order modal frequencies of the working gate were not fully breaking away from the high energy zone of the dynamic water, which would induce severe vibration. The vibration response of the gate became the biggest when it was operating at 0.5 partial opening.
The Study of Environmental Characteristic by Coastal Engineering in Rock Coast
Authors: Zhang Chun Hua , Han Xiao Qing , Li Jing , Zhang Wei , Wu Kai , Gao Wei Ming
Published: November 2012

In order to study the evolvement of rock coastal in Hebei Province, the data was taken to study the evolved stations, such as relief maps, charts, remote sensing imagines and the field data of different areas from 1956 to 2007. With 3 S technology, it analyzed the evolvement processing and reasons of the rock coast by construction of coastal engineering in half century. The results were shown that it was changed strongly by the station from 1979 to 2007 when the station stopped the littoral current caused by coastal engineering such as Qinhuandgao Port and Shanhaiguan Shipyard. As the result, the section was deposited in the east of Qinhuangdao Port while eroded in the west. And the highest erosion speed was 2.49 m/a in the section from Xinkaihe River to South Mountain shipside. The angle was about 60°~80° from between middle bay and east bay. By the transport yield reduce of Tanghe River and Chituhe River, the coastline was eroded by NNE and ENE waves. Without the supply of sediment from the east bay and middle bay where were eroded seriously, the erosion speed was above 3.26 m/a, and the section was eroded fast with the speed of 3.67 m/a between Jinshan Mountain and Tiger Stone in west bay.
Comparative Study on Landslide Hazard Deformation Forecast Method
Authors: Fu Hua , Yang Jing Li , Zhang Jin Hua , Liu Ming Wei
Published: November 2012

The key problem which the control of landslide hazard is the prediction of landslide fatalness, successful landslide forecast can consumedly decrease the loss caused by landslide hazard. Landslide spatial forecast can determine the location of unstable slope. For a certain landslide in Three Gorges Reservoir area, according to the existing monitoring data and analysis methods, such as: nonlinear regression analysis method, exponential smoothing and gray prediction method, to forecast deformation tendency of landslide from quantitative point and take comparative study. Results indicate that the gray prediction method is more tally with the reality in the deformation prediction. It can provide reference for deformation forecast of similar landslide or slope prevention in chongqing and Three Gorges Reservoir area.
Block Element Analysis for Earthquake Response of Joint Rock Slope
Authors: Yin De Sheng , Qing Wei Xing , Li Chun Sheng
Published: November 2012

In this paper, the Block Element Method (BEM) for dynamic analysis is developed and applied to historical analysis of seismic stability of a rock slope. Combine the idea of viscous-spring boundary with the theory of BEM, the artificial boundary condition of BEM is formulated, which can eliminate reflection of the seismic waves from the boundaries of the calculating domain. Also, the relationship between the displacement and the stiffness of discontinuous is adopted in the dynamic block element method. The corresponding program is written by FORTRAN language and the application of the intake slope demonstrates the capacity of this method.
Two-Dimensional Numerical Wave Simulation for Port with Submerged Breakwater
Authors: Zhang Na , Guo Ke , Zhang Wen Zhong
Published: November 2012

Engineering designs often come upon with steady mooring problems in a wide range of port with submerged breakwater. Plane physical model is difficult to implement due to spatial limitation and, so far, there is no effective numerical method to solve practical engineering problems by two-dimensional simulation. This paper first verifies the empirical formulas for transmission coefficient of submerged breakwaters in domestic and international researches against the results of sectional physical model. The verification shows that the calculated results with the empirical formula of Yang (1981) are the most consistent with the measured data and a bit conservative. Based on Yang’s formula, porosity coefficient is used to simulate the integrated effect resulted from the physical features of overtopping, wave transmission and reflection on a prototype submerged breakwater. Then a plane physical model test is carried out to verify the simulation and the results are in good agreement. This paper provides an effective numerical simulation method for wave protection of ports with submerged breakwater.
The Application of Compaction Sand Pile in the Yellow River-Crossing Project for South-to-North Water Diversion
Authors: Liu Qi Xia , Bai Yang
Published: November 2012

In the construction of Yellow River-Crossing Project for the Middle Route of the South-to-North Water Transfer, the silt, silty sand and fine sand widely exist in the foundation, that it need to be processed in the region where the possibility of sand liquefaction because of the low bearing capacity. We had a detailed study and experiment for the sand compaction pile of the axis and the outside of the channel, and determined the compactness of pile body, pile length and the construction technology through the test. We also debugged the concrete construction parameters such as the amount of filling sand and stone, hoisting height and speed, extrusion times and so on. For these experiments, we attained the purpose of increasing the relative density, preventing sandy soil liquefaction, improving the shear strength of the foundation soil and the bearing capacity of the foundation, so as to reduce the foundation settlement.
Splitting Criterion of Grouting Bore-Hole Wall and Study on Numerical Simulation of Crack Propagation
Authors: Su Pei Li , Gu Shuan Cheng
Published: November 2012

The situation that the grouting borehole doesn’t intersect with natural fractures of rock masses is often met in practical grouting project. Hence, it’s very necessary to discuss whether the rock masses around borehole will split under the grouting pressure and the corresponding splitting orientation. After the splitting crack finishes propagation, we can estimate whether it will penetrate with original fractures, and it’s favorable for grouting theory analysis and numerical simulation and so on. According to this, the splitting criterion and splitting orientation are proposed with and without considering ground stress, respectively. In the meantime, under the situation of splitting, the singularity of crack-tip’s stress field is simulated by 6 nodes singular isoparametric element through secondary development of large-scale finite element analysis software-ANSYS. The stress intensity factor is introduced and the propagation of the splitting crack is simulated to obtain the final propagation length, which has significant guiding meaning to grouting theory and the practical grouting projects.
Study on the Free Vibration of Odd Power Oscillators
Authors: Huang Yan , He Song Lin
Published: November 2012

The cycle formula of undamped free vibration of odd power oscillators has been gotten by theoretical analysis. The formula shows that the cycle is related to the initial conditions. The numerical experiments reveal that there are three states such as damped oscillation, critical damped oscillation and overdamped oscillation while an odd power oscillator moves in linear damping force. These situations are same as that of a linear oscillator. Unlike the linear oscillator, the critical damping constant of an odd power oscillator is related to the initial conditions. The quantitative expression of the critical damping constant changing with system parameters and initial conditions has been obtained. By analyzing of numerical experimental data, the exponential decay law of the amplitude of an odd power oscillator which moves in damped state has been discovered.
Numerical Simulation of the Damping Influence on Vortex-Induced Vibration
Authors: Yin Zhong Jun , Cao Yan Shu , Han Tian , Wang Xiao Song
Published: November 2012

The main purpose of the numerical simulation that described in this paper is to investigate the damping influence on vortex-induced vibration (VIV) system. By considering different damping ratios, the 1-dof vortex-induced vibration of a rigid cylinder with low mass ratio is investigated numerically by the RANS solver combined with SST turbulence model. Comparing of the simulation results that obtained under low damping ratio by J.S. Wang and experimental results which carried out by Williamson and Govardhan, it indicates that the computing model in this paper is reliable. In addition, by using our model we analyze the vibration under the other two damping ratios, including the corresponding amplitude response and frequency response. We observed significant frequency locking phenomenon under different damping conditions, and locking region decreases with increasing damping.
Stability Analysis of Unloading Slope by Interface Element Method
Authors: Sun Ying Xue , Chen Song , Cheng Shuai Ran
Published: November 2012

Mechanics behavior of unloading rock slope is essentially different from the natural rock slope . But, stability analysis of rocky slope during and after excavating still need these parameters and constitutional relation came from the natural rock slope, thus, the difference between the unloading rock mass and natural rock mass is neglected. The calculation result is quite different from the monitoring result. In order to analyze the stability of unloading rock slope properly, corresponding mechanics parameters including mechanics state, unloading degree and others should be determined and applied. In this paper, IEM - Sample Element Method and Interface Element Method expounded systematically and used to determine the corresponding mechanics parameters of a layered rock slope- Xishan slope of the Jiangyin Yangtze River Bridge. Then, IEM computer program based on Interface Element Method used to calculate the displacement of Xishan slope. Compare with displacement site-monitoring results, IEM is better than Finite Element Method.
Transverse Vibration of Axially Accelerating Moving Fabric: Experiment and Analysis
Authors: Lin Hong , Zhou Chang Li , Shi Jun , Feng Zhi Hua
Published: November 2012

Axially moving fabric can be met in many textile devices. In most cases, the transverse vibrations of fabric can cause a series of negative influents to the product. In this paper, the transverse vibration of axially accelerating moving fabric, which is excited by velocity fluctuations, is investigated by experimental method. The harmonic varying velocity is achieved through a brushless DC motor controlled by PWM technology based on the embedded microcontroller LPC1768. An inductive non-contact displacement sensor is used to measure transversal vibration of fabric. The motor speed is measured by a photoelectric encoder. The experimental data is processed by measurement platform based on Labview and the analysis is given. Laboratory measurements demonstrate the effect of velocity fluctuations on transverse vibration of fabric, particularly near the parametric resonance region.
Evaluation of Strength and Ductility of Thin-Walled Stiffened Box Sectional Steel Bridge Piers Using Fiber Model
Authors: Zhang Jian Dong , Ge Han Bin , Wang Chun Lin
Published: November 2012

A simplified seismic evaluation method for steel members with thin-walled stiffened box sections is developed. First, a finite element model based on the shell element was carried out and its effectiveness was validated by comparison with the experiment. Twelve numerical cases were then simulated by the shell model and the fiber model, respectively, and their accuracies were discussed. Numerical results showed that the proposed method using the fiber model, employing the bilinear kinematic hardening relation, is of good accuracy. If the maximum strength is taken as the ultimate point, the bilinear stress-strain relation, replacing the yield point by the buckling stress, was recommended. If a point corresponding to 95% of the maximum strength after the peak is regarded as the ultimate point, the elastic-perfectly plastic stress-strain relation was suggested.
Numeric Analysis on Seismic Performance of RC Round-Ended Piers with HRBF500 Steel Bars
Authors: Jia Hui Juan , Dai Hang
Published: November 2012

4 RC round-ended piers with HRBF 500 steel bars are analyzed by finite element package ABAQUS under low reversed cyclic loading. In order to check the validity of the FEM analysis，the numerical analyses results of RC round-ended piers with HRBF 500 steel bars are compared with the previous experimental results. It indicates that the analytical results calculated by ABAQUS agree well with the test results. The paper mainly researches the seismic performance, including component ductility, strength and hysteresis dissipation characteristics, of HRBF 500 steel bars applied in High-speed railway piers. The effects of strength of longitudinal reinforcement, axial compression ratio, hoop reinforcement ratio on the seismic behaviors of piers are analyzed. The research results will provide the important datas for HRBF 500 steel bars used in bridge pier of high speed railway.
Photogrametry-Based 3D Modeling and Measurement for Scale Model of an Arch Bridge
Authors: Li Ping , Zhang Jin Quan , Nie Jian Guo , Lu Jian Ming , Li Wan Heng , Yuan Mo Hai
Published: November 2012

The real and measurable model is helpful for structure simulation. Photogrammetry technology provides a new method to model a structure by photos. This article explored the feasibility of photo-based 3D modeling for the arc bridge structures by ordinary digital camera. Firstly, the preparation processes before modeling were introduced, that included camera calibration, designation of shooting program, how to take photos and plan measurement. Secondly, photo orientation and modeling process were introduced, too. A measurement test was put forward to get some good points to enhance the accuracy. By comparing the measurement accuracy of modeling results from the four photos and eight photographs, some proposals were presented to improve the accuracy. The 3D model can be integrated with the loading conditions and material properties, to provide the detailed data for analyzing the structure.
Experimental Study of Stress Corrosion of High-Strength Wires Affected by Four Typical Ions
Authors: Yin Jian Guo , Deng Chu Han , Fu Yu Guang , Li Liu Chi
Published: November 2012

Characterized by light weight and high strength, cold-drawn galvanized cable wires are widely applied in all kinds of prestressed structures and cable structures. Investigation shows that cables are sensitive to corrosion. Severe corrosion of cables results in cable replacement which are costly, and even more, collapse of the whole bridge. In this paper, several tests were carried out to present the crack growth of wire in stress corrosion in different solutions. In particular, as Cl-, OH-, SO42- and NH4+ have major effect on stress corrosion in seawater and acid rain, these four kinds of ions are selected in tests. And all four kinds of corrosive solutions are tested with the concentration of 1.5 bsp and 3 bsp respectively. Effects on ultimate tensile strength and sensitivity of cable wires are different for each of chosen ions, and the increasing concentration for the same solution would drop ultimate tensile strength and the modulus of cable wires.
Finite Element Model Updating of Existing T-Girder Bridge by Field Quasi-Static Generalized Influence Line
Authors: Liao Jing Bo , Tang Guang Wu , Pan Fei
Published: November 2012

Finite element model updating is the important foundation of structural damage detection, condition assessment for engineering structure. A new method, for finite element model updating based on the quasi-static generalized influence line (QSGIL) residual objection, is presented to update the finite element model of beam-structure in order to improve the quality and precision of finite element analysis. Both of the theory and model experimental study show that the proposal method can efficiently update the finite element model in the previous study [1]. In this paper, the updating techniques are further developed to update the finite element model of the existing T-Girder bridge, the QSGIL of the updating model agrees very well with the field QSGIL of the existing bridge, which illustrates that the proposal methodology is promising in the practical bridge structure and other structures.
Mitigation of Wind-Rain-Induced Cable Vibration in Cable-Stayed Bridges: Measurement Error
Authors: Wang Ling Yun
Published: November 2012

Recent advances in structural and construction technologies have enabled engineers to use the cable efficiently in relatively large structures such as long span cable-stayed bridges. It appeared that many factors and phenomena can generate cable vibration. The cables usually possess low damping and are therefore prone to many vibration problems, even causing large displacement. The active control method has been introduced to control the cable vibration in the cable-stayed bridges. The active control method is an effective method to suppress cable vibrations by adjusting the cable tension which is varied with time. This approach utilizes the axial motion of cables supported by an actuator installed at the anchorage to produce a time-varying force in the cable. To synthesize the feedback control signal, the cable vibration is measured by an optical tracking sensor attached at the mid-span cable. The studies are carried out to investigate the measurement error features of the control method as a design guideline.
Settlement Control and Impact Analysis of the Subway Shield Under-Passing Beijing-Shanghai High Speed Railway Bridge
Authors: Peng Hua , Wei Jia Chong , Zhang Bin
Published: November 2012

When the shield tunnel go through the bridge structure of high speed railway, it will affect the high speed railway bridge structure, thus influence to the bridge of track structure and ballastless track. Based on the Beijing subway tunnel go through the Beijing-Shanghai railway bridge section engineering examples, for the first time to shield under through the high speed railway caused the bridge pier settlements are analyzed. Combined with the actual monitoring data, the isolation pile during the period of construction bridge pier and Shield during through bridge pier during the period of settlement regularity of construction bridge pier, settlement regularity of Isolation pile as well as settlement regularity of the surface land are summarized analysis. During the construction of high-speed rail bridges and the soil to produce a certain degree of deformation, Shield Zone just above the soil settlement with a large deformation, both sides of the deformation gradually decreases, but the deformation is controlled. The use of the isolation pile reinforcement measures significantly reduced the influence by the Shield Construction and it can satisfy the requirement of high speed railway control standards
The Application of Thermal Insulation Glazed Hollow Bead Concrete in Tunnel Cooling Structure
Authors: Li Ke Jie , Li Zhu , Guo Xiu Hua , Liu Yuan Zhen
Published: November 2012

With the mining depth increasing, the effect of temperature on coal mine is outstanding with each passing day. In order to enhance the tunnel insulating layer heat insulation effect, thermal insulation glazed hollow bead concrete will be used in tunnel wall thermal insulation layer, the characteristics of thermal insulation glazed hollow bead concrete will be discussed and the appropriate mixture ratio and coefficient of heat conductivity will also be determined, as well as in the basis of reasonable theoretical analysis and derivation, prediction of the thermal insulation material of surrounding rock after exhaust heat will drop significantly, and it is proved that the thermal insulation glazed hollow bead concrete used in deep mine roadway can produce the benefit and have broad prospects.
Simulative Analysis of Structure Vibration of Diesel Engine Based on Finite Element Method
Authors: Cao Xiao Hui , Kang Qing Ying
Published: November 2012

The simulated prediction of the structural vibration of diesel engine has been made in this paper. The displacement maps on different frequencies were obtained by using finite element model. The FFT (Fast Fourier Transform Algorithm) was used to the displacement data of the parts where the vibration is strong. So, the displacement spectrum was obtained on those points. The study shows that response displacements between 60~500Hz are bigger than others. This is due to the rigid displacement of the diesel engine. There are some other big response displacements around 800Hz, 1400Hz and 1800Hz.This is the result of local vibration of the oil pan, flywheel shell and gear room cover. Improve the three parts structure can effectively reduce vibration of the diesel engine.
Vibration Propagation Characteristics of Binary Periodic Sandwich Panels
Authors: Ge Pei Pei , Yu Gui Lan
Published: November 2012

By using the finite element method, the band structures of the periodic hollow cylinder sandwich panels are investigated, and the influences of the material and geometrical parameters on the band gap are discussed in detail. The results show that The Young's modulus of panel and the coated layer have the greatest influences on the band gap of binary periodic hollow steel cylinder sandwich panels. The smaller the Young's modulus, the lower the frequency band gap. The material and geometrical parameters of the core have important influences on the lower edges of the band gap. Thicker and higher hollow steel cylinder with large density is favorable to gain a wide low-frequency band gap. The work presented will provide a theoretical guidance in the vibration isolation research.
Polyamide 6 Microfiber Reinforced Porous Polyurethane Composites
Authors: Wang Lin , Cao Si Tong
Published: November 2012

The effect of polyamide 6 (PA6) microfiber and porous polyurethane (PU) on tensile strength and softness of the PA6 microfiber reinforced porous PU composites was investigated. The tensile strength to break the composites is close to that of the corresponding PA6 microfiber nonwovens. It indicates that the PA6 microfiber provides the tensile strength for the composites. The porous PU has little effect on the tensile strength of the composites. The softness of the composites is dependent on PU modulus, which decreases with increasing the PU modulus. In this work, optical microscope and scanning electron microscope (SEM) were used to study the morphology of the composites. The micrographs showed that the diameters of the PA6 microfibers and bubble holes are relatively uniform which are in the range of about 1 to 3 μm.
Experimental Study and Numerical Analysis of Sihui Metro Depot and the Superstructure
Authors: Zhang Jing , Zhang Bin , Liu Ying Hua , Wang Long Qi , Wu Yu Bin
Published: November 2012

Field tests were carried out on Sihui metro depot of Beijing metro line 1 and its superstructure. The acceleration time history of sleepers and floors of the building was obtained, and the waves-propagation laws of building were studied through the tests. Test analysis shows that the structure vibrations show zigzag tendencies ascends with the height of the building. Based on current situation of Sihui metro depot, a metro-soil-building 3-dimensional finite element model is established on ANSYS. By using actual acceleration of sleepers as inputs, the dynamic responds rule of the superstructure is obtained. Compared calculation results with the experimental results, the given numerical model can predict the vibrations of the building induced by moving trains quite well. This method can provide guidance and technical support for future development of superstructure.
The Discussion of Acoustic Seabed Sediment Classification Methods
Authors: Zheng Hong Bo , Yan Pin , Chen Jing
Published: November 2012

Acoustic seabed sediment classification method is always important research contents in marine geology and marine acoustics because of its characters of low-cost and high efficiency. At present, there are mainly three types of acoustic seabed sediment classification methods:(1) the echo signal statistical characteristics classification; (2) image texture classification; (3) submarine acoustic parameter inversion method. The principles of anterior two classification methods are similar, which is based on statistics, unknown sediment type can be concluded according to the statistical characteristics of known sediment. There are many usable acoustic equipments and commercial classification software for the two kinds of methods. The third type method is based on suitable seabed sediment model. Seabed acoustic characteristic parameters are inversed and thus seabed sediment can be classified. At present, there are few usable acoustic equipment and commercial classification software for the third method, but it's more accurate than the anterior two classification methods.
The Determining Method of Background Light Attenuation Coefficient in Discerning of High Temperature Forgings
Authors: Yin Zhong Hui , Li Chun , Nie Jia Bin
Published: November 2012

The key of high temperature forging size measurement based on using CCD is to extract the forging contour from the complex background. According to different forging field conditions, the paper obtains the necessary and sufficient preconditions for forgings discriminated from the background by analysis on the radiation spectral character of the high temperature forgings, the reflective spectral character of the background light and the spectral response character of the color CCD. The preconditions show that only when the reflection of background light less than the radiation of the high temperature forgings can the forgings be discerned completely. This paper proposes an implementation method for size measurement. The method has the advantages of clear concept and low operation costs. It provides the theoretical basis and available way for the discrimination and size measurement of high temperature forgings based on common and special color CCD.
Study on Impact of Vibration Direction on Linear Vibration Screening Effect
Authors: Zhao Yue Min , Wang Ke , Dong Liang , Zhang Bo , Yang Xu Liang , Zhu Zai Sheng
Published: November 2012

Based on Hertz-Mindlin contact model in software EDEM by discrete element method, using linear vibrating screen 360 mm×600 mm, movement characteristics of particle group on sieve plate and law of particles going through sieve plate were studied in screening process of coal in certain conditions, which were as follows: dip angle was 0 °, amplitude was 5 mm, frequency was 11 Hz. The simulation test results show that there are important influences of vibration direction on screening process. And influence law of vibration direction on screening effect was revealed finally. The paper also gained mathematical model between particle group’s screening efficiency and vibration direction angle, and mathematical models of particles easy or hard to sieve and material between average movement speeds and vibration direction angle.
Vibration Localization in a Fluid-Loaded Rectangular Plate with Rib Irregularity
Authors: Hu Hao Hao , Shang De Jiang
Published: November 2012

This paper studies the vibration localization of fluid-loaded irregularly ribbed plate analytically. The modal expansion method was adopted to solve the multi-coupled system, the ribs were considered as Timoshenko beams attached to the plate. The localization mechanism was investigated by comparing different coupling effect at the plate-beam interface, it was found the ribs space irregularity only localize the modes associated with the shear force coupling. Both the light and heavy fluid loading pressure were concerned by Rayleigh integral , the study showed that obvious vibration localization phenomenon can be achieved by the ribs space irregularity, and the localization effect was weakened by the long range interaction through the heavy fluid, although the response amplitude of the modes decreased obviously. The investigation may be quite significant for vibration confinement and noise control in engineering.
Calculations on Optical Path Difference of a Reflecting Scanning Fourier Transform Spectrometry Based on Cube Reflector
Authors: Zhang Xin Jie , Yang Xiao Xu , Wang Wen Fang
Published: November 2012

Compared with normal reflecting scanning transform Spectrometry, cube-based Spectrometr is a key component in the time-based modulation interference spectrometer, it have more compact structure ,using less accessory , easy to fix up , more steadily and more practicality . Calculations on optical path difference (OPD) of spectrometry play an important role in analyzing and improving of the structure. Following the law of Malus and the geometrical relationship of model, get the formula of OPD and the affective factors .The calculation results demonstrate that OPD is closely related to the tilted angel of rotating reflector , the size of cube reflector and the refractive index of reflector. And this kind of spectrometry has the character of high resolution, especial in some spectrum.
Vibration Testing Parameters Measured by Sampling Moiré Method
Authors: Lei Zhen Kun , Wang Zhu Lin
Published: November 2012

With ability of full-field phase distribution obtained from one grating image by the sampling moiré method, it has potential applications in the dynamic measurement. On the basis of introduction to the basic principle, the sampling moiré method is utilized to characterize the vibration parameters of a shaking stage. A piece of paper with black and white grid lines is pasted on the surface of the measured object as an optical non-contact displacement sensor. Experiment images are recorded by a CCD camera during the translational experiments and vibration experiments. The translation experimental results show that the sampling moiré method has a high measurement accuracy of less than 0.12% of the grating pitch. The vibration experimental results are consistent with the theoretical values. Experimental errors are discussed finally.
Multi-Axis Load Cell Designs Employing Multiple Shear Beams
Authors: Fernandez Rajan
Published: November 2012

Binocular and parallel plate structure load cells are very successful designs for strain based measurements of shear loads. In this paper we use finite element methods (FEM) to investigate the suitability of these two load cell designs for use in a force plate and compare the sensitivity of these two force plates to that of the Heglund’s force plate. Each force plate is also sensitive to two moments with axis in the same plane as the force plate. If the force plate is to be used as a two component force-moment sensor, we determine which moment axis is best to use. Finally, a novel six-axis load cell is modelled by assembling three force plates together with rotational symmetry. The sensitivity of the six-axis load cell is calculated using FEM. Analysis of the six axis load cell predicts good measurement sensitivity and isotropy while maintaining low interference between measurement axes. Further benefits of the load cell design are discussed.
A Monocular Vision System Based on the Equidistance Pseudo Binocular Feature Recognition
Authors: Zhang Jing , Zhong Ming , Huang Bo
Published: November 2012

Monocular vision system for medical robot must have high accuracy. In traditional monocular vision system, localization algorithm is realized by image space transformation, which leads to a trivial calculation process and a complex camera calibration method, therefore, this paper presents a new target characteristics identification method. Through the establishment of an equidistance pseudo binocular image acquisition way, searching the image and space coordinate transformation relation, avoid the complicated space matrix conversion and improve the position precision. Using Pointer method for image processing and customized backtracking boundary conditions for image searching, this paper realizes the curve fitting of target features boundary, and pattern recognition. Finally, an experiment is completed to guide the pharmacy movement of the Staubli TX40 arm, whose software runs within 200 ms and location error is less in 0.2 mm, verifies the validity of the algorithm.
Research on the Technology of Flexible Tactile Type Sensor
Authors: Zhang Yue Xian , Li Bin
Published: November 2012

The application filed and characteristics of flexible tactile sensor are introduced in this paper. Main technologies including microelectronics mechanical system and other new material of flexible tactile sensor are proposed. The structure and the working principle of microelectronics mechanical system used in flexible sensor are described and explained. The principle of piezoresistive of strain gauge is researched on. The piezoelectric properties of polyvinylidene fluoride is also narrated. The coupling effect of the dielectric mechanical properties and the dielectric mechanical properties are discussed. The conductive mechanism and the piezoresistive effect of flexible tactile sensor based on conductive rubber are analyzed. Physical properties of main technology of flexible tactile sensor are proposed summarily. Moreover, advantages and disadvantages of technologies above are analyzed. Some problems to be solved and research contents of flexible tactile sensor are put forward.
The Research of Measurement System Based on Linear CCD in Industrial Line
Authors: Wang Jian Hui , Zhang Li , Chen Wen Jie , Chen Hua Di
Published: November 2012

There were a lot of small work pieces in the industry, like the lamella and the small steel wire line etc. Some of them could not be touched directly, for high request in some production line to the works piece thickness accuracies which depend on an on-line examination for manpower could not satisfy a production line anymore. This paper introduced a kind of measure system based on the production line of linear CCD, with the control chip of EPM3064A and measure chip of TCD132. Sampling the output signal from CCD module and sending the datum to host computer, built by VB with AVR128 MCU in RS-232 serial communication mode and displayed the waveform images with binarization in real time and analyzed them. Finally, with the help of Key9 software to carry on unmanned auto supervision and realized message sending function. The experiment showed the precision, rapid of this system and good humanization of control effect as a result.