bluuebunny/crossref_metadata_2025 huggingface dataset:
Statistical Analysis of Fundamental Periods of Frame Structures
Authors: Gao Yan Qiang , Liu Wen Feng
Published: November 2012

The differences of empirical formulas of China, the United States, Japan, and Europe for estimating the fundamental periods of frame structures are investigated. Summing up paradigms of the empirical formulas from the above representation countries, the paradigm formulas expressed as single-variable exponential type, single-variable linear type, and multi-variable non-linear type. Using statistical data of 36 groups of the measured fundamental period for least-squares regression analysis, and the effect of fitting regression formula is judged by the norm of relative error ‖δ‖2, the norm of root mean square error ‖RMSE‖2, the norm of residual mass‖CRM‖2. The results show that: the single-variable exponential type has wide application and gets closer with measured fundamental period; the single-variable linear type is brief, and the single-variable based on structural height has a smaller error with measured fundamental period, the single-variable based on the stories of structures has a larger error with measured fundamental period; the multi-variable non-linear type is very complex and larger error compared with the measured fundamental period. Considering the formula in the form of simple, practical and consistent with the codes, this paper gives single-variable exponential type as recommended empirical formula for estimating the fundamental periods of frame structures .The proposed empirical formula can serve as a reference for revision of the seismic design code, frame structure seismic design and related studies.
Model and Application on Displacement Calculation of Abutment by Considering Earthquake Effects
Authors: Chen Hong Kai , Tang Lan , He Xiao Ying , Liu Rong Can
Published: November 2012

The response characteristics to the seismic action of displacement for abutment are the important part of security evaluation, earthquake resistance and disaster mitigation in the seismic region. This paper decomposes the displacement of abutment into the slip displacement and rotation displacement two parts, respectively proposes the translational and rotational displacement model of abutment and establishes the corresponding calculation formulas. The case analysis indicates that the response characteristics of abutment displacement to the seismic action are comparatively sensitive, in which the translational displacement appears positive response relationship with the acceleration of seismic, while the rotational displacement appears negative response relationship. However, it holds significant mutation from 0.5g to 0.6g for both of the translational displacement and rotational displacement. In other words, the seismic acceleration from 0.5g to 0.6g should be paid highly attention in doing seismic resistance design in the seismic region.
Effect of Wetting on the Pullout Resistance of Grouted Soil Nails
Authors: Wu Jason Y. , Chang Jr Min
Published: November 2012

In this research, laboratory pullout tests were conducted on grouted soil nails to study the effect of wetting on the interface shear resistance between nail and soil during pullout. Deformed bars with equal size to the true soil nails were used as model nails. The soil used was silty fine sand collected at the site and prepared to a very dense condition. Rainfall infiltration was simulated using duplicated soil nails inundated by water for different periods. Test results indicated that the peak pullout resistance strongly decreases upon wetting, with a reduction of about 60% after soaking for 28 days. However, the experiments showed that there is a threshold water content (or soaking time) beyond which the effect of infiltration on the pullout resistance is reduced. The laboratory protocols developed in this study offered an easy scheme for the prediction of the pullout capacity of a grouted soil nail upon wetting.
Based on Crack the Second Expansion the Variation and Generalized Variation Problem of Fractured Rock Mass under Unloading
Authors: Yu Li , Fu Ming Fu , Tu Bin
Published: November 2012

Firstly, in the paper based on the constitutive equation and the basic equations of the unloading fractured rock mass on the second expansion phase at the crack, the two types of variables of the energy functional about the variation problem was constructed the,as the independent variables at that stage. In order to identify the undetermined function G,the energy functional variational the independent variables ,,the variational function was satisfied the principle of minimum potential then can obtain the function G. Second, Secondly on this basis, two undetermined Lagrange multipliers were introduced to the new functional in order to absorb the balance equation and stress boundary conditions into the new functional .As the same, variational the independent variables,, then obtained the . To simplify the using the Green formula and then can be identified the undetermined Lagrange multipliers.Finally,the unloading the fractured rock mass at the crack of secondary expansion phase of the unconstrained variational energy functional can be obtained which is the generalized variational principle.
The Records of Slope Reinforcement Engineering in a Loess City
Authors: Liu Qi Xia , Fan Liang
Published: November 2012

This article selected a typical loess slope engineering as the research object, and through the characteristics of loess landslide, landslide environmental geological conditions, the formation mechanism of the landslide study of the loess area of urban slope instability factors, loess slope stability of the calculation method and reinforcement measures. This paper adopts the theory of Morgenstern-Price to analyzing the stability of the slope, referencing with Sweden finite slice method, Simplified Bishop method, Simplify Janbu method. The reinforcement adopts the technology of possessed anchor to disposing the loess slope, and has good Practice effect. The loess slope stability study area has a large reference.
Research on Factors Influence of Vegetation Slope Protection Based on Grey Incidence Analysis Theory
Authors: Chen Feng , Xiong Xiao Bo , Zhai Zhi Ming , Gu Cheng , Zhang Xin Bo
Published: November 2012

Vegetation Slope Protection Engineering was affected by several factors, and has become the focus of the geotechnical engineering. The stability of the vegetation slope must be controlled rigorous according to the surrounding environment condition and safety level of the slope in highway. According to the Grey Incidence Analysis (GIA) method of grey system theory, a new grey theory model is applied in analyzing of the characteristics of Eco-engineering protected by roots of vegetation, to attain the correlation coefficient affected by extent of the factors. After analysis of several practical Bio-engineering examples, to attain the most influencing factors of the stability of vegetation slope are the density of roots (ρ), the length of roots (L), the diameter of roots (D), the weight of soil (γ), the anti-pulling force of roots (P), internal friction angle (φ), cohesive strength(c) and the shear strength of the soil (τ). The role of factors is classified in order to define the extent of the impact and provide guidance for construction and design of Eco-engineering. After analyzing the data collected from the field and several classicistic documents, utilized Grey Incidence Analysis method to make prediction in order to guarantee the slope safety. It shows that the grey system theory can be effectively and practically adopted in the slope stability analysis of vegetation slope in expressway and that has a good prospect.
Study on Deformation-Based Seismic Performance Index of Arch Dams
Authors: Yao Xiao Wen , Jiang Jian Qun
Published: November 2012

Concrete arch dams are critical structures, the failure of which would lead to catastrophic effects on a regional scale. Considering the uncertainty characteristics of earthquake and the self-adjustment of inner force of arch dams, it’s necessary to investigate the seismic performance index of arch dam for holistically evaluating the seismic safety of arch dam-foundation system subjected to high intensity seismic excitations. By considering the contraction joints movement and concrete material nonlinearity, a series of dynamic response-history analyses of arch dam were carried out under increasing levels of earthquakes. Based on these analyses, the performance index of crest deformation is recommended for the seismic safety assessment of arch dam. And several performance stages of seismic response including the opening of contraction joints and the distribution of concrete damage are also investigated.
Application of Improved Threshold’s Lifting Wavelet to the Analysis of the Dam’s Displacement
Authors: Zheng Xue Qin , Qin Dong , Liu He Zhi
Published: November 2012

The series of dam’s deformation data can be seen as a string of digital signal, which is composed of different frequencies. Because of the high frequency noise in the noise information, a new method of improved threshold’s lifting wavelet function is demonstrated. Using this new method to abstract components of dam monitoring data. This new method can eliminate the defect existing in traditional threshold function during the denoising process. The example shows that the lifting wavelet based on improved threshold function is more accurate and objective in the process of abstracting component compared with the traditional wavelet , which is feasible to analyze the dam performance precisely and practically. Therefore, it plays a pivotal role in the analysis of the dam performance.
Test Study on the Influence of Interface of Soil and Rock on the Stability of Sandy Soil Tunnel Face
Authors: Tong Jian Jun , Wang Ming Nian , Jin Hu
Published: November 2012

Through model tests, three different locations of the interface of the soil and rock in sandy soil tunnel were simulated. The failure processes of the face and the un-supported section were described. The initial and finial depth-width ratios were obtained. The failure features and mechanism were analyzed. The tests show that the longitudinal equilibrium arch in the un-supported section fist forms, and then the tunnel face damages. The failure surface shape approximates to logarithm spire curve, and it is the interface of the soil and rock when there is the interface of the soil and rock in front of the tunnel face. The interface of the soil and rock improves the stability and the depth-width ratios of the tunnel face and the un-supported section, especially when it is in front of the tunnel face.
Dynamic Response of Vehicle-Bridge Coupled Oscillation Subjected to Velocity-Varied Moving Loads
Authors: Mei Fu Liang , Li Gui Ling
Published: November 2012

A mathematical model of vehicle-bridge coupled oscillations for a simple-supported bridge beam subjected to speed-varied moving loads was established according to TFDVM and model superposition method. This model can consider the pitching and vertical movements of a vehicle. By contrast to a vehicle-bridge oscillation coupled model based on one-freedom-degree Mass-Spring-Mass vehicle model (OFDMSMVD), the mathematical model of vehicle-bridge coupled vibrations based on TFDVM can more accurately reflect the dynamic behaviors of vehicle-bridge coupled vibrations .The maximum middle-span deflections of bridges under speed-varied cases are not linearly proportional to the entrance speeds of moving loads, and they happen at a number of entrance speed points of moving loads. The influence of acceleration and deceleration of moving loads on the dynamic deflections of bridges is dependent on the entrance speeds of moving loads.
Research and Analysis about the Effects of Curved Bar-Tied on Arch Bridge’s Structural Performance
Authors: Zhao Shu Qing
Published: November 2012

When designing under-supported bar-tied arch bridge, the type of bar-tied usually is straight. But sometimes based on design or the needs of some aspects, curved bar-tied is often used. Taking the main bridge of XinZhang highway bridge as the background, this paper, by using general finite-element software to set up calculation model, studies and analyzes the effects of different types of bar-tied on the arch bridge’s structural performance. Through the analysis, we know that it is not suitable to choose curved bar-tied for under-supported bar-tied arch bridge when designing and constructing.
Existing Concrete Girder Bridges' Bending Stiffness Assessment Based on Crack Characteristics Parameters
Authors: Tan Dong Lian , Yan Wen Hua
Published: November 2012

A lot of existing reinforced concrete girder bridges appeared cracks in the service phase. Because of the beam's cracks existing, the sectional bending stiffness of the beam decreased. It would reduce the structure's bearing capacity, so the bridges' structure performance urgently needs to be assessed by effective methods, so as to study further measures. In this paper, based on the indoor model test results of four pieces of model beams, regression analysis of the crack characteristics parameters and test's load-displacement curves has been carried out. The relationship between crack characteristics parameters and girder bridge's bending stiffness has been established. The qualitative assessment of structure crack's appearance inspection is transmitted to quantitative assessment, so it will make the assessment more objective and scientific.
Mechanical Mechanism Analysis of Longitudinal Cracks Appeared in a Large Cable-Stayed Bridge Cable Tower
Authors: Yang Liang Liang , Dong Jun , He Jie , Liang Tian
Published: November 2012

The cable-stayed bridge which has been found longitudinal cracks in tower is taken as the background, combining with the original design information and the results of bridge inspection. The numerical simulation on temperature effect of cable tower has been done with MIDAS/Civil, and the results have the same trend with observed in bridge inspection, indicating that the cracks in tower probably are caused by temperature effect. Then, some suggestions are raised in the end of this paper about how to deal with these cracks. This work could be a valuable reference for similar large cable-stayed bridge. And the temperature stress should be paid more attention in design process to avoid appearance of temperature cracks which affect beauty and durability of structure.
On Orifice Design for Reducing Self-Excited Vibration of Aerostatic Guideway
Authors: Zhang Ya Nan , Satomi Tadaatsu , Si Wen
Published: November 2012

Aerostatic guideway is an essential sub-system for high-accuracy measurement. As compressible air is used for suspension, several problems arise aside of its other advantages. The most important aspect that should be taken into consideration is self-excited vibration activated by inner or/and outer environments. This paper discusses how the orifice layouts and the orifice diameter affect the self-excited vibration of the aerostatic guideway, or two-dimension x-y stage as a whole. Theoretical formulas for flow coefficient of orifices are obtained and experiment of differential pressure test is conducted. Both theoretical and experimental approaches of aerostatic guideway design and characteristics of vibration attenuation are proposed in this research. The results show that by optimizing orifice diameter and orifice layouts, good effect on reduction of self-excited vibration can be achieved, with the time of vibration attenuation reduced from 1.8s to 0.9s.
Effectiveness Analysis on the Protection Measures for the Mountain Bridge Piers against Rockfall
Authors: Yu Zhi Xiang , Zhang Lan Yan , Zhao Ya Na , Wei Tao
Published: November 2012

In order to study effectiveness of measures taken to protect mountain bridge piers against rockfall in the upper reaches of the Minjiang River in Sichuan, based on non-linear explicit dynamic analysis, a numerical model was established to analyze the effectiveness using Holmquist–Johnson –Cook(HJC) damage constitutive model .And the numerical stability of calculation was tested in accordance with energy conservation principle. Four working conditions of bridge pier, namely ordinary non-protection, encryption stirrups, thickening plain concrete protection layer, being wrapped in steel tube, had been analyzed.Then by studying the response characteristics of the pier including the maximum damage depth of concrete, stress of longitudinal rebar, failure volume of concrete, different effectiveness of the three protective measures was compared . The rationality of analysis was verified by comparing with experimental results.The study shows that the HJC constitutive model can simulate the behavior of concrete under impact load well, and respectively protective effect of being wrapped in steel tube , thickening plain concrete protection layer, encryption stirrups, is weaker than the previous one.
Research on the Thermo Physical Properties of Lauric Acid-Capric Acid Binary Mixture Phase Change Materials
Authors: Zhou Quan , Zhang Yi , Guo Hong Bin , Li Qing Hai , Li Dong Xu
Published: November 2012

Lauric acid(LA) and capric acid(CA) were mixed into binary mixture, whose melting temperature was predicted with Schroder’s equation and tested in step cooling curve method. Then latent heat was tested by DSC, and T-history method was used to test thermal conductivity of binary mixtures, heating and cooling characteristics were studied through expanded perlite(EP) adsorption of binary mixtures. Results show that Schroder’s equation can be used to predict melting temperature of fatty acid, and binary mixture prepared of 6:4 molar ratio has a high latent heat and its temperature is within a range that meets indoor comfort temperature. Thermal conductivity and the heating and cooling characteristics of the mixtures reveals that the thermal conductivity of fatty acid phase change material(PCM) is low, which restricts its latent heat release rate.
Experimental Research on Small Diameter Concrete-Filled Steel Tubular by Ultrasonic Detection
Authors: Xiong Rui , Lu Zhean , Ren Zhi Gang , Xu Chang Wu
Published: November 2012

Ultrasonic testing technique is an important nondestructive testing method, which has been widely used to the defect detection of CFST and is the preferred alternative for concrete close-grained degree and uniformity test. The test becomes difficult when the diameter of the concrete-filled steel tubular is less than 250mm,as the combination of different media and the reduction of dimension on CFST increase the difficulty degree of detection. As the experimental research basis, 4 different preinstalled-defect CFST are produced. The principle and methodology of Ultrasonic detection is comprehensive researched on the signal characteristics, such as wave speed, wave amplitude, sound speed and wave shape, etc. It gives useful suggestions for the theory and practice of identification of defect types and the quality control in small diameter CFST.
Experimental Studies on Loads Acting on Two Piles of Side-by-Side Arrangements in the Uniform Flow
Authors: Zhu Zhao Qing , Dai Guo Liang
Published: November 2012

Indoor model experiments were made to study drag loads on two piles of side-by-side arrangements in the uniform flow. Take three different velocities of the flow, three different diameters of piles and five different distances of two piles in the experiments to get the variations of loads. Drag forces were measured by a two-component balance. Analysis on experiment results shows that drag forces increase with the increase of the pile diameter, the increase of the flow velocity and the decrease of the distance of two piles. The drag coefficient CDunder different Reynolds numbers shows the same change law. The drag coefficient CDdecreases with the increase of the distance of two piles and has good coherence to the ratio of the distance of two piles to the pile diameter.
Numerical Analysis of Flow Field Characteristics in Three-Z-Shaped Ultrasonic Flowmeter
Authors: Tang Jing Yuan , Chen Jian Ming , Ma Hong Bin , Tang Guang Yu
Published: November 2012

The flow field characteristics in U-typed bend has been extensively studied for transit time ultrasonic flowmeters designing, but for the flowmeter with three-Z-shaped round pipe there is still lack of corresponding research. This paper presents a computational fluid dynamics (CFD) approach for modeling of the three-Z-shaped ultrasonic flowmeter and studying of internal fluid field characteristics based on Reynolds stress model (RSM). The fluid velocity profile in the three ultrasound path is obtained using CFD and secondary flow in cross section also is analyzed. The simulation results show that the internal flow fields in the flowmeter are not fully developed turbulence with asymmetric axial velocity distribution and dramatic changes along the flow direction, and there are obvious secondary cross flows on theirs cross-sections. The CFD simulations provide useful insights into the flow field associated with ultrasonic flowmeters design.
Research on Fruit State Discrimination Method for Harvesting Robot
Authors: Lv Ji Dong , Zhao Dean , Ji Wei , Zhang Ying , Ma Zhi Kui
Published: November 2012

Because fruit state need to be discriminate to select the different harvesting method before it is fast picked, the fruit state discrimination method was developed. Firstly, the two apple images were acquired, and then segmented by the improved OTSU dynamic threshold segmentation method. Secondly, the picking target fruit was selected based on the principle of the nearest distance to image center when there were a lot of fruits. Thirdly, the two segmented fruit images were done by the inter-frame difference method, then the target fruit state was got using the connection number discrimination to the difference image and the centroid coordinates matching discrimination to the oscillating fruit image. Lastly, the test results showed that the designed algorithm was feasible and effective for most cases in natural environment, and the discrimination time was less than 0.2s.
Risk Fuzzy Measurement and Early-Warning of the Project in Material Supply Chain
Authors: Fu Xing Fang , Li Ji Jun , Li Le Xi
Published: November 2012

In the environment of network competition, it is a basic condition of stabilized operation to measure effectively the risk with early warning of the project of material supply chain system. From the angle of system, this paper analyzes the set of risk factors of the project of material supply chain, and provides a fuzzy method for the supply chain whole risk of measures. Making use of this method, we can acquire the valid early warning of the system risk of project of material supply chain, so as to solve the disadvantage of deviating between the risk analysis of system and node of the project of material supply chain, all which has profit to the risk managements of system effect of the project of material supply chain and the choice of cooperation contract company.
Development on Filtering Algorithms of Airborne LiDAR Point Clouds
Authors: Shi Jian Qing , Jiang Ting Chen , Jiao Ming Lian
Published: November 2012

Airborne LiDAR is a new kind of surveying technology of remote sensing which developed rapidly during recent years. Raw laser scanning point clouds data include terrain points, building points, vegetation points, outlier points, etc.. In order to generate digital elevation model (DEM) and three-dimensional city model,these point clouds data must be filtered. Mathematical morphology based filtering algorithm, slope based filtering algorithm, TIN based filtering algorithm, moving surface based filtering algorithm, scanning lines based filtering algorithm and so on several representative filtering algorithms for LiDAR point clouds data have been introduced and discussed and contrasted in this paper. Based on these algorithms summarize the studying progresss about the filtering algorithm of airborne LiDAR point clouds data in home and abroad. In the end, the paper gives an expectation which will provides a reference for the following relative study.
The Realization of Communication Interface Module for Dynamic Belt Weighting Device in Transporting Unit of Biomass Pyrolytic System
Authors: Wu Jun Hui , Zhou Quan , Chen Jie , Si Hui Ping , Lin Kai Yan , Zhang Chi Bin
Published: November 2012

With the full study of industrial process control technology for thermal, chemical industry, the application process, the FCS system of biomass pyrolysis unit was development combined with the actual. Feeding system uses the weighing system of dynamic belt with an advanced embedded technology. The computing speed and accuracy, data processing compared with traditional electronic belt scale, information exchange, integration, reliability and stability will be greatly improved. The technology shall be constantly upgraded and vigorously promoted. This paper introduces the control system based on Profibus-DP communication interface module of belt weighting device in transporting unit biomass pyrolysis system. Taking a PC, as a single master station system, and the data is transmitted from the master station to the slave station through the communication card. At the same time, the MCU+SPC3 are used to design the hardware interface circuit from the station. The mechanism of data polling transmission between a master and slave is conducted. Communication protocol of Profibus-DP is analyzed, and then, GSD file is compiled.
The Achievement of the Algorithm of the High Precision Dynamic Rail-Weighbridge System
Authors: Tian Xiang , Hou Wen
Published: November 2012

The dynamic rail-weighbridge is a sort of weighing machine,which is used to weigh the load of large moving vehicles.Compared with the static rail-weighbridge,it is more convenient to complete the weighing task,because the vehicles are always moving in the process and need not to stop for weighing.This article brings up a new set of dynamic rail-weighbridge system,which could conduct data-acquiring of the trains’ dynamic data first,then process the information and at last auquire the trains’weight,the speed and other functional parameters,when the trains passed through the the weighing platform.During the later processing of the data,the algorithm makes use of the mechanics and figures out the weight of the trains,considering the swing or vibration from different orientations of each carriage and the deformation of the steel rails when the rails passes.
Three-Dimensional Scanning System with Double Structured-Light Sensors
Authors: Peng Bin , Tan Hai Shu , Zhou Fu Qiang
Published: November 2012

Three-dimensional (3D) vision scanning measurement is widely used in industry for its ability to obtain the 3D surface data of the object. Aiming at overcoming the shortcomings of 3D scanning measurement system with single structured-light sensor, such as limited measurement range and blind measurement area, a scanning system based on double structured-light sensors (DSS) is established. The object is scanned from two different directions, and the 3D surface coordinates are unified to the measurement coordinate system to obtain the 3D surface of the measured object. In this paper, the mathematical model of the DSS scanning system is established. Meanwhile, an on-site calibration approach based on planar target is proposed to complete the system calibration task. Finally, experimental results of practical data are given to show the feasibility and validity of the proposed system.
Methods for Testing Micro-Dose X-Ray Radiation
Authors: Liu Cai Xia , Huang Jin , Zheng Wen
Published: November 2012

The X-ray security inspection systems are widely used in airports, customs, and railway stations now. Their radiation safety is related to the health of public. It is necessary to take radiation safety tests at least once a year. For their energy is usually in the level of keV, the radiation caused by photoelectric effect is the most important. According to the photoelectric effect of X-ray, the methods of testing Micro-dose X-ray radiation include radiography method, ionization testing method, scintillation testing method and semiconductor testing method. Radiography method and ionization testing method can be used to test the stronger X-ray radiation, while scintillation testing method and semiconductor testing method can be used to test the weaker. Geiger counter testing method is not proper to be used when taking the accurate test; however, because of its relative low cost, non-professional technicians can use it to test the Micro-dose X-ray radiation daily.
Experimental Research on Shrinkage Deformation Measurement of Light-Cured Composite Resin Using ESPI
Authors: Zhu Qi Rong , Shen Wei Liang , Xie Ming Ru , Yang Guo Biao
Published: November 2012

Based on ESPI experimental principle and finite element theory, this research obtains the law that the shrink of light-cured composite resin leads to deformation. The out-of-plane displacement of light-cured composite is measured by ESPI experimental system, and then the model corresponding to the test that is built in ANSYS and numerical simulation are building, so that solidified deformation and stress of light-cured composite is studied. These results are compared with each other and the differences between the results are small. It is found that ESPI is a feasible testing method which is suitable to deformation measurement of structure surface. Influence factors of drawdown deformation of composite resin are obtained by ESPI experiment and numerical calculation, some basis is provided for clinical treatment, and direction that improve the performance of light-cured composite resin are provided for manufacturer of this resin.
Slope Adaptive Based Filtering for Airborne LIDAR
Authors: Yang Xiao Yun , Cen Min Yi , Liang Xin
Published: November 2012

In this paper, a three-stage algorithm for raw LIDAR data filtering has been presented. Firstly, the raw data is re-sampled to grid, which size should take into consideration of raw data density and usage intention. Then a slope adaptive region growing is used to segment grid cells to different surface patches. Secondly, segmentation adjacency is established based on topological analysis. Two perceptual cues, that is, connection and elevation are computed for every pair of the adjacent segmentations. By the cues, the upper segmentations are classified as terrain, building, vegetation and others. Finally, the grid cells classified as terrain are used to build approximation of the terrain surface. Raw data are accepted as terrain within a given distance from the surface. To illustrate the effectiveness of the new procedure for DTM production, a series of data sets from ISPRS are tested. The results show that the method can discriminate terrain points from non-terrain points correctly.
Research on Water Pipeline Leak Location
Authors: Zhang Jia Rong , Nie Dong Hu , Wang Can
Published: November 2012

With the accelerated process of urbanization, water pipeline leak problem becomes more and more serious. If this problem dose not solved in a timely manner, water resource waste, even serious geological disasters will be caused. In order to locate the water pipeline leak position, we studied the characters and mechanism of the leakage acoustic signals in this paper, and analyzed the spectrum characters of acoustic signal with different leakage quantity and noise on pipeline diameter sudden change point. Based on this, we designed and implemented a set of software, using wavelet denoising method and cross-correlation time delay estimation method for leak location. Finally, we conducted an experiment based on the cast iron pipeline with a diameter of 1.5 inch using the proposed software, and compared the results obtained by different processing approaches. As a conclusion, the experiment results and the theoretical expectations are basically the same.
Research on Fe(100-x)Gax Alloy Applied to Magnetostrictive Displacement Sensors
Authors: Zhou Xin Zhi , Yu Chao , Xiong Yin Qi , Ning Qian
Published: November 2012

The saturation magnetostriction (λs) for Fe-Ni alloy can only reach 30ppm, leading the magnetostrictive displacement sensor based on the alloy not to be used in the large displacement measurement. Therefore, applying Fe(100-x)Gax alloy, of which maximum λs can reach 400 ppm to giant magnetostrictive displacement sensor is presented. The crystal magnetostrictive model is shown at first; and then the magnetostriction in [100] and [111] directions have the decided advantage over Fe-Ni alloy and Ni alloy is given; besides, the characteristics of high permeability, low coercivity and low hysteresis loss for Fe(100-x)Gax are shown; moreover, the signal of the magnetostrictive displacement sensors made from Fe(100-x)Gax is analyzed. Finally, it is proved that Fe(100-x)Gax (17≤x≤19) is practicable for extending measure range of MDS.
A Real Electronic System to Control Virtual Machine in NC Machining Simulation
Authors: Wang Qi , Wang Qing Ming , Zhang Xiao Feng
Published: November 2012

In this study, a system composed of real electrical communication system and virtual machine part has been used on NC machining simulation. By establishing a interface based on socket protocol, communication is established between real CNC systems and virtual machine tools. So, processing information of CNC system can be accurately passed to the virtual machine tools. Virtual machine is driven to work in accordance with the instructions of the CNC system. Experiments show that the system is steady and process is repeatable. With structure diagram of communication based on socket protocol shown, the system can be used to detect the manufacturability of the product design process or debug the electrical equipments more efficiently at low cost. It’s also helpful in testing the reliability of NC code in virtual machining.
BIM-Based Real-Time Monitoring of the Equipment Maintenance of Property
Authors: Sun Cheng Shuang , Che Qian
Published: November 2012

The operation phase is not only the longest stage of the life cycle of a project, but also the moment when people accumulates most information of the project. Because of the secular and complexity of property management during the operation period, and as there is large amount of information loss during the several periods before operation, it is very difficult to manage equipments all through the way. Based on the BIM technology, authors build a database of the equipment operation parameters to solve this problem. This paper realizes the real-time monitoring of the update of equipment information, equipment maintenance and fault handling during the operation stage. The research puts forward a new way to improve the standards of property management which will lead to a better economic benefits.
The Evaluation and Research of Disasters Emergency Shelter in Laoshan District, Qingdao
Authors: Zhang Wen Hua , Gao Hui Ying
Published: November 2012

With the continuous development of our society and economy, urban planning plays a more and more indispensable role in modern city management. And the planning and construction of disasters emergency shelter and emergency evacuation road is a very important part of urban planning. By using ArcGIS software, spatial data can be stored, edited, managed, analyzed and so on. Using ArcGIS software, this paper focuses on the disasters emergency shelters, emergency evacuation roads and sources of secondary disasters in Laoshan district, Qingdao by referring to the national standard related the construction of disasters emergency shelter. What is more, it points out some unreasonable aspects of the existing disasters emergency shelter planning. At last, it puts forward some relevant advices regard to emergency evacuation roads and disasters emergency shelter.
Application of Extension Theory Based on Optimal Combination Weighting Method in Risk Assessment on Geological Hazards
Authors: Wang Xia Lin , Yan Bao Wen
Published: November 2012

Risk assessment on geological hazards and zoning is the foundation of geological hazards prevention. To solve the problem of uncertainty and incompatibility between quantitative and qualitative indicators, and the deficiencies of the indexes weight method, this paper establishes the model for risk assessment on geological hazards binding the extension theory with the optimal combination weighting method. With the matter-element model of the extension theory, the weight coefficients are calculated by using the optimal combination weighting method that can effectively use the experience of expert judgement and accurately reflect the utility value of the data, and can properly resolve the problem of weight allocation. Then, through calculating the correlation function value and relational degree, determine the actual geological hazard grades of study area. Finally, this paper applies this model in Hanyin County of Shannxi Province and gets the predicting results compared with AHP method and entropy method, and the results conform to the fact. It is proved that extension theory based on optimal combination weighting method is quite effective and available in risk assessment on geological hazards.
An Experimental Study on the Performance of Wave Dissipation of Artificial Sand Bar
Authors: Zhao Duo Cang , Shi Bing , Yang Li Peng , Zhang Zhi Yong
Published: November 2012

The paper summarizes the results of the performance of wave dissipation of an artificial sand bar experimental study under regular waves .In the experiment, the water levers are 0.00m、design high water level (1.35m) and extreme high water level (2.66m) ,it chooses the corresponding the limit wave height of three kinds of water level ,and analyzes the influences of relative height of artificial sand bar (d/H)、relative water depth of artificial sand bar (R/H) and wave steepness (H/L) on transmission coefficient of wave.The result shows that artificial sand bar has well the performance of consuming wave energy, the incident wave height starts up clearly decrease, while wave passes through artificial sand bar.With changing in conditions of artificial sand bar geometric dimensioning and wave parameter, transmission coefficient of regular waves also Changes.
Application of Western Surrealistic in Design of Landscape Architecture
Authors: Huo Dan , Yang Fan
Published: November 2012

Surrealism was the twentieth century’s longest lasting art movement in the arts. It explored the mysterious dream world of the unconscious mind. Surrealist works depict a familiar yet alien world of dreamlike serenity and nightmarish fantasy, and their legacy pervades much of contemporary art, literature, film and popular culture. As a representation of irrational aesthetics in the modern art trends, it is worthwhile to study the influence and construction of Surrealism in modern landscape architecture. This paper explores the modern landscape form under the influence of Surrealism Art by analyzing and investigating the intrinsic relationship between Surrealist Art and the modern landscape architecture. Besides that, this paper described the connection between surreal spirit and Chinese landscape architecture design term metaphor of “presence”.
Experimental Study on a Shower Waste Water Heat Recovery Device in Buildings
Authors: Guo Yong Xian , Cai Ying Lin , Liang Shi Qiang , Chen Wei
Published: November 2012

Large amounts of heat were waste during showering process, especially in public buildings. In this paper, a waste water heat recovery system containing a clever concept device was designed and set up to investigate the potential for shower water heat recovery. The device can be installed directly on the floor of the shower room and can be used to preheat the cold water going to the water heater. The principle of the device was introduced, and the energy saving effects of the device was studied experimentally with different conditions. The results indicated that more than 50% of the shower waste water heat can be recycled by the high-performance heat recovery device, which indicated that this device has good economic property and could lead to obvious social and economic benefits.
The Design and Prestressed Modal Analysis for Megawatt-Class Wind Turbine Rotor
Authors: Gao Wei , Li Chun , Liu Quan , Chen Yu
Published: November 2012

The blade is an important component of the wind turbine, which is essential to proper blade design. This paper summarizes the process of the blade design, the selection of the design parameters, and the design of megawatt-scale blades. The finite element method was applied on the model generated in 3D graphics software. After selecting the material parameters of the blade, the modal analyses under prestresses were conducted so as to determine the modal shapes, frequency, maximum deflection and maximum stress at different orders of vibration. Thus the results were compared with those of modal analysis under the non-prestressed condition. Thus the conclusion on the effect of gravity and rotation-prestress on the modal frequency, maximum deflection and maximum stress in modal analysis will be drawn.
Free Vibration Analysis on Combined Cylindrical-Spherical Shell
Authors: Wu Shi Hao , Qu Ye Gao , Huang Xiu Chang , Hua Hong Xing
Published: November 2012

Based upon the Reissner-Naghdi-Berry’s shell theory, a domain decomposition method (DDM) is utilized to investigate the vibration characteristics of the combined cylindrical-spherical shell with different boundary conditions. The combined shell was first apart from prescribed-displacement boundary and then divided into some cylindrical and spherical shell subdomains, respectively. The boundary equations were introduced into the energy functional of the combined shell as well as the constraint equations derived from interface continuity conditions between two adjacent shell subdomains. Fourier series and Chebyshev orthogonal polynomials were employed as the admissible displacement functions for each shell subdomain in the circumferential direction and axial direction in order to obtain the discretization equations of motion of the combined shell. Exact free vibration solutions of the combined shell has been performed via the DDM and were compared with those obtained by the finite element software ANSYS to confirm the reliability and accuracy.
Research on Vibration Control of High-Speed Press Frame Structure
Authors: Zheng Xiang , Yao Jing Lin , Wang Jun Ling
Published: November 2012

High-speed press is pressure processing equipment that can form parts in high-speed operation conditions. In this paper, in order to improve machining accuracy, analyze ant-vibration performance using finite element method; analyze vibration effect of complete machine and combination machine with steel and cast iron material respectively. Observe vibration reduction in different screw pre-tightening force; Select the best body structure to do modal analysis. If the experimental results and the FEM results are the same, state the validity of the model. In dynamic characteristics simulation analysis, it’s more accurate when considering the effect of material and pre-tightening force.
Influnce of Support Stiffness on Free Vibration and Force Transmission Rate of Helicopter Driveshaft
Authors: Wang Huan Jun , Yu Da Wei , Yue Yong Wei , Wang Chao
Published: November 2012

Bending vibration of helicopter driveshaft is a main source causing damage of bearing supports and noise of transmission system. Firstly, we get driveshaft element stiffness matrices and mass matrices based on the finite element theory. Then, we get calculate matrix eigenvalue of the entire system. Finally, we get natural frequencies and natural modes of different bearing system. Mass eccentricity is one of the main excitation sources of the transmission system vibration and noise. This excitation is transmitted to base by bending vibration of drive shaft, causing body vibration and noise. As transmission rate changes with different bearing stiffness of supports, it can be employed to reflect influence from bearing stiffness of supports on bending vibration of axis. Transmission rate can be used as input parameters (motivation) or goal parameters to reflect the performance of driveshaft vibration.
Technology and Application for Modal Testing of Cable-Stayed Bridge
Authors: Zou Yi Song , Chang Quan Hui , Peng Wei
Published: November 2012

In the cable-stayed bridge damage identification index based on the dynamic characteristics, it is the key and premises for cable-stayed bridge damage identification using dynamic index, how to extract the modal of structure exactly through optimal placement of sensors. This article uses simulated annealing, In line with the modal assurance criterion, extract mechanical analysis data of Zhangzhen cable-stayed bridge ANSYS finite element model and obtain optimized acceleration sensor layout scheme of main beam. Based on this optimization scheme we carry out a dynamic characteristics test on Zhangzhen cable-stayed bridge. Through the comparison between observation results and calculation results, we find they are very closely. To verify that the simulated annealing algorithm based on modal assurance criterion used in cable-stayed bridge acceleration sensors optimized is effective, viable, and correct.
Experimental Modal Analysis of Vehicle Body in White
Authors: Chen Shu Ming , Shen Chuan Liang , Song Xue Wei , Wang Deng Feng , Li Wei
Published: November 2012

In order to know the vibration characteristics of the vehicle body in white, the experimental modal analysis was performed by using LMS modal equipment. The basic principle of experimental modal analysis was introduced. Then, the first ten order modes were obtained within 100 Hz. The front several main modes were analyzed. The test results fully show that the car body in white has excellent first order torsional, bending and overall vibrational characteristics.
An Experimental Study on the Effect of Submergence on a Vertically Oscillating Hydrofoil at Zero Translational Velocity
Authors: Fernandez Rajan , Alexander Keith
Published: November 2012

This paper presents experimental results for the hydrodynamic forces on several different bodies oscillating in the vicinity of the free surface. Firstly, results for two horizontally symmetric bodies, a flat plate of finite thickness and a cylinder, are presented. Results show that these two different shaped bodies react in different ways with the free surface and are likely to have different added mass associated with them. Secondly, results for two thrusting bodies, a NACA0012 symmetrical foil and a NACA4415 cambered foil, show that the free surface amplifies the thrust produced by a vertically oscillating foil. Results showing the effects of spanwise flow are also presented and indicate spanwise flow is negligible at zero translational velocity and so the use of endplates of the foils was unnecessary. The conclusion of these experiments is that a submergence of 5 chord lengths is sufficient for the horizontal and vertical forces on the vertically oscillating objects to be unaffected by the free surface.
Numerical Simulation Method of Acoustic Wave Propagation Based on Semi-Symplectic Theory
Authors: Li Zhong Fang , Ma Wan Zheng
Published: November 2012

An acoustic wave propagation simulating method based on semi-symplectic theory is developed. The acoustic wave equations with n degree of freedom in space domain of Lagrange System which are obtained in FEM are converted to equations with 2n degree of freedom in Hamiltonian System with the Legendre’s Transformation. These equations are then integrated with the Precision Integration algorithm in time domain. The algorithm is employed to simulate the acoustical wave propagation in two dimensional medium. We demonstrate the remarkable stability of the presented algorithm by comparison of the results of the FEM and that of the Semi-Sympectic Theory under different time steps. The results presented in this paper show that the proposed algorithm is effective, accurate, and not sensitive to time step.