bluuebunny/crossref_metadata_2025 huggingface dataset:
Dynamic Response Prediction of Underwater Explosion Vessels
Authors: Li Linna , Hu Yanfei , Fang Chenchen , You Yue , Liu Kai , Huang Sen
Published: April 2020

In order to ensure the safety of the underwater explosive vessel in service, it is necessary to analyse the dynamic response of the underwater explosive vessel. The dynamic response model based on Classification and Regression Tree is established to simulate the mapping relationship between load and container strain. A reliable and stable model is obtained by cross validation. At the same time, compared with Multi-Layer Perceptron model, CART model is faster and more accurate in training, and the prediction effect is obviously better than Multi-Layer Perceptron model, which further explains the validity of CART model and provides a better method for dynamic response prediction of container.
MPPT for Single Phase Five Level Quasi-z-source Photovoltaic Inverter with Fuzzy Controller
Authors: Aziz Ismailou Abdoul , Wang Honghua , Lu Tianhang , Wang Chengliang , Shi Fan
Published: April 2020

The fast growth of PV system has led to the development of power electronics devices which come along with lots of challenges. One of these is the structure design including the choice of different elements involved. This paper presents an advanced off grid photovoltaic (PV) system with less components and high efficiency. The structure shows a multilevel cascaded inverter (CHB) with the advantage of less harmonics and high voltage level, quasi-z source inverter (Q-ZSI) which plays the buck/boost function for efficient operation of power electronic devices. Hence, reducing the cost and the volume of the whole system. The buck/boost operation is implemented by simple boost control (SBC) method for shoot through insertion. The pulse width modulation technique (SPWM) used is phase shift technique (PS-SPWM). This paper also compares the performance of fuzzy logic controller(FLC) with incremental conductance (Inc cond) algorithm for MPPT by focussing on their adaptability, speediness and precision despite the changes in solar irradiance. The overall system is implemented in matlab-simulink environment for simulation. Thereby confirming the feasibility and efficiency of the system.
Preliminary Result of Seismic Hydrodynamic Pressure on Bridge Pier with Submerged Depth from a Shaking Table Model Test
Authors: Liu Haiming , Tao Xiaxin , Tao Zhengru , Qin Yifang
Published: April 2020

To deal with the hydrodynamic pressure on bridge pier with submerged depth in water, a shaking table model test is reported in this paper. The model is designed and built for a pier of cable-stayed bridge submerged in 1.5 m water with a scale of 1/50. Two sets of motions, for E1 and E2 levels are input in two bi-directions, transverse and vertical, and longitudinal and vertical. The results show that the hydrodynamic pressure is getting larger with submerged depth obviously, with a. increasing rate larger than that for the formula in our existing design guidelines, but smaller than that by Westergaard.
HVDC Circuit Breaker Development and Applications in VSC-HVDC Transmission Project
Authors: Yang Yuefeng , Ren Menggan , Cao Junzheng , Liu Wang , Zhan Xiong , Zhao Caiping
Published: April 2020

High voltage direct current (HVDC), especially voltage source based HVDC (VSC-HVDC), transmission technology has been expanding in recent decades. HVDC circuit breaker therefore attracts significant interest due to its abilities of current interruption and fault isolation. This paper aims to present the technical development, specifically the topology, control and protection technology and test technology, of HVDC circuit breaker and its applications in VSC-HVDC transmission project. The project background, system configurations, and circuit breaker topology are described for each project. Based on current circuit breaker development and applications, the challenges and associated future development are also presented.
The Calculating Method of Rock Compressive Strength Based on Logging Data
Authors: Ma Yongqian , Tang Zhijun , Dong Guanghua , Shao Ru , Bi Yantao
Published: April 2020

Rock compressive strength was a basic lithomechanics parameter. And rock compressive strength affected the drillingability and stability of rock in drilling engineering. So a calculating method of stratum rock compressive strength was needed to raise the reliability of stratum information acquired. Then the bit selection, well design and reservoir stimulation design could be more accurate. By analyzing the experiment data of rock 3-axis compressive strength, a logging interpretation method of confining pressure has been established, and by considering the influence of confining pressure, a quantitative calculating method of rock compressive strength based on the logging data has been given. This model was used to analyz an exploration well. The results showed that the rock compressive strength was fit to the drilling time, which indicates that this model may accurately recognize the rock compressive strength in the researched area. The result also showed that confining pressure can strongly influence mechanical properties of formation rocks, so if we analyzed the rock mechanical properties, the confining pressure must be taken into account. Besides the method can calculate rock compressive strength in some old well with regular logging data only.
The Power of Short - term Load Algorithm Based on LSTM
Authors: Wang Zhankui , Wu Junying , Xin Rui , Bai Tao , Zhao Jianbin , Wei Minglei , Li Jingquan , Zhuang Lei
Published: April 2020

The power data is affected by many factors and has long time series, which fully meets the conditions of long-term and short-term memory neural network. This paper analyzes and models various influencing factors such as time, vacation and meteorology, and uses adaptive moment estimation optimization algorithm. The traditional optimization algorithm is improved, the generalization of the model is improved, and the short-term load forecasting of power can be stably and efficiently operated to ensure the reliability and safety of national electricity. In this paper, the short-term load forecasting experiment is carried out in a certain area of Hebei Province. The experimental results show that the proposed algorithm outperforms the existing similar model and has higher prediction accuracy.
Design on ADES Based on IFTDEPMG and its Efficiency Test
Authors: Wang Guosheng , Wang Chao , Xiao Jie , Lei Qiangshun
Published: April 2020

The accelerator/decelerator is the key part of the electromagnetic suspension (EMS) for it bears the function of torque changer and of speed changer synchronously. This paper introduces the scheme and working principle of electromechanical suspension for armored vehicles firstly. Then, the requirements of the accelerator/decelerator of the electromechanical suspension (ADES) are introduced according to the characteristics of armored vehicles. The accelerator/decelerator of an involute few-tooth-difference external parallel moving gear is designed, and an accelerator/decelerator prototype is tested on the bench. The results show that the accelerator/decelerator of the involute few-tooth-difference external parallel moving gear (IFTDEPMG) has high efficiency in bidirectional transmission, which satisfies the transmission requirements of electromechanical suspension in both active and passive conditions.
Energy Saving Effect of Small Water Station Motor in Enterprise
Authors: Li Hailong , Liu Shengyun , Tan Xiaodong , Xu Liyan
Published: April 2020

In this paper, the electric motor energy-saving transformation system of an enterprise of CNR is taken as the carrier, and the vertical centrifugal pump motor is taken as the object of energy-saving transformation. The operation of the existing working motor in the water station is investigated and the working parameters are measured and studied. The existing motor condition is transformed into energy-saving system. And the energy-saving transformation scheme, data calculation and economic benefit analysis of the whole energy-saving system are determined.
Numerical Simulation of Hydrodynamic Pressure on Bridge Pier in Water for a Model Test
Authors: Qin Yifang , Tao Xiaxin , Tao Zhengru , Liu Haiming
Published: April 2020

Finite element model with considering the fluid and structure interaction is built by software ADINA with the same conditions of a shaking table model test in this paper. The hydrodynamic pressures at 7 submerged depths on the water-pier interfaces, as the same positions the sensors fixed in the test, are calculated from motion inputs E1 with PGA of 0.2651g and E2 with PGA of 0.51g numerically in two direction combinations. The result shows that the pressures from the simulation and the test are close to each other, and means that the numerical procedure adopted in this paper is feasible to take into account the water-pier interaction, while the test results are also validated by the simulation.
A Centralized Transcribing System’s Design and Implementation
Authors: Yao Hao , Ye Qige , Yan Xiaoling , Jiang Dongna , Tang Zongshun
Published: April 2020

In order to meet the demands of collecting data of gas meter, electric energy meter and water meter, a centralized transcribing system is proposed. This system is based on EPON+LORA technology to set up the communication network, for transcribing and managing data; and design a platform that can realize data collection, data analysis, classification display, classification billing, fault classification, user management and other services.
Study on the Alloy Coatings Properties of the New Rare Earth Yttrium Zinc Aluminum Magnesium
Authors: Zhang Yue , Zhou Ziran , Tong Decheng , Ren Hengxin , Du Juan , Zhao Yaxin , Cheng Yuqing , Lin Peng , Zhao Chang , Lv Yuguang
Published: April 2020

Hot dip plating is a main methods of iron and steel protection, but the traditional hot dip galvanizing products can not meet the actual needs. The addition of aluminium (Al), magnesium (Mg), rare earth (Re) and other alloying elements in zinc solution has become a hot research topic. In order to obtain multicomponent alloy coating with high corrosion resistance, a new type of hot dip galvanizing coating was obtained by adding Re yttrium(Y) into Zn-Al-Mg plating bath. The influence of adding elements Re Y, Al and Mg on the corrosion resistance of hot dipped galvanized coatings was studied by conducting immersion tests, salt spray tests and electrochemical tests (Tafel, EIS), and the anticorrosion mechanism of the coatings was primarily explored. The results showed that rare earth yttrium can improve the corrosion resistance of hot dipped galvanizing, and Zn-2%Al-1%Mg-0.08%Re alloy coating has the best corrosion resistance. Hopefully, the present work uses the current hot dip galvanizing production equipment and technology, the established galvanizing technology can be applied in industry.
The Preparation of PLA/PLGA Composite Membrane and Its Application as Periodontal Barrier Membrane
Authors: Zhang Xue , Cai Xiaoqing , Zhao Haibing , Jin Zhimin , Hu Maolin
Published: April 2020

We synthesized high molecular weight polymer PLA (polylactic acid) and low molecular weight polymer PLGA [poly (lactic-co-glycolic acid)]. Then we prepared PLA/PLGA composite membrane by blending these two polymers, and tested various properties, such as physical, mechanical and biological properties for periodontal barrier. When PLA/PLGA = 2: 1 (w/w), degradation rate of the membrane was 63.7% within 32 weeks. The membrane showed aperture pores of 2 - 5 µm, the minimum tensile strength of 5.75MPa, and the porosity above 90%, which was beneficial to the entry of nutrients and the elimination of metabolic wastes. Under SEM (scanning electron microscope), we observed that gingival fibroblasts only grew on the positive surface, and didn’t grow on the negative side or the cross-section, indicating that the membrane played a good role of mechanical barrier.
Study of Nano Texturing on Multi-crystalline Silicon Solar Cells
Authors: Wang Shaoliang , Xu Zheng , Gou Xianfang , Huang Xixi , Zhou Su
Published: April 2020

Nano texturing has been confirmed as an effective structure to improve the efficiency of multi-crystalline silicon solar cells by reducing optical loss. In this study, nano textured solar cells are fabricated by the Reactive Ion Etching (RIE) method based on a conventional production line. Several characterization methods are employed to evaluate the morphology, minority carrier lifetime, quantum efficiency and electricity performance of both nano textured and micro textured solar cells. The results show that nano textured solar cell has the highest efficiency of 19.21 % and an average efficiency of 18.86%, which is 0.57 % higher than that of micro textured solar cells. Thus, the RIE method is an effective way to manufacture nano textured solar cells. It can demonstrably improve the photoelectric conversion efficiency of mass-produced solar cells and reduce the production cost, which is significant to the development of solar cell industry.
Screening of Wetting Agent for Peat Substrate and Its Effect on Cucumber Seedlings
Authors: Du Qingjie , Xiao Huaijuan , Li Juanqi , Wang Jiqing , Zhao Yueping
Published: April 2020

Peat is a widely used horticultural substrate, and its inherent hydrophobicity lead to inconvenience to the transportation and application of the peat substrate. In our experiment, three common wetting agent, fatty alcohol polyoxyethylene ether O-20, sodium butyl naphthalene sulfonate and sodium dodecyl benzene sulfonate were used to wet the peat. The best wetting effect on peat was obtained by fatty alcohol polyoxyethylene ether O-20. Cucumber seedling was subjected to different concentrations of fatty alcohol polyoxyethylene ether O-20 to wet the peat. We investigated the changes in emergence rate, above and below morphology and dry quality, and growth of cucumber seedlings. The results showed that the suitable concentration of fatty alcohol polyoxyethylene ether O-20 could increase the emergence rate of cucumber, the growth of hypocotyl, and root volume of seedlings. However, the stem diameter, fresh quality, underground dry weight and seedling index were not significantly different compared with control. Different concentrations of treatment had no significant effect on cucumber leaf number, maximum root length and shoot dry mass. In conclusion, the fatty alcohol polyoxyethylene ether O-20 with a concentration of 1.0 g/L is suitable for wetting the grass charcoal matrix, which has good economic and seedling effects.
Adsorption Evaluation with Zeolites for Gases in the Confined Space
Authors: Zheng Xin , Li Yao , Li Wenli , Su Zhen , Xu Jing , Li Yan , Yuan Aihua , Xu Yusong , Zhai Linzhi
Published: April 2020

The high humidity characteristics of the confined space challenge the zeolites with good water performance. In this study, the adsorption of N2, CO2, H2, CH4, CO and H2O vapor by zeolites (5A and 13X) were discussed, and the structure of zeolites were characterized by XRD, FTIR and SEM. The adsorption breakthrough curve of CO2 was measured by the fixed bed reactor, and the adsorption characteristics were obtained under different temperatures and gas velocities. The results showed that 13X-2 zeolite had the CO2 adsorption capacity of 100.1 cm3·g−1, which is higher than the others, and the appropriate water stability.
Study on Heat Transfer and CFD in a SCR Reservoir
Authors: Zheng Su , Hu Zejun
Published: April 2020

According to an industrial demand of the simulation of the heat transfer in a SCR reservoir by Plastic Omnium, we firstly developed a 3D numerical model written in C++. Subsequently, the computational performance of the model was analyzed with both laboratory and industrial experiments. Besides, it was optimized by implicating certain advanced numerical methods, for instance, a gas-liquid flow simulation based on three dimensional VOF method was implicated in order to simulate the phase change coupling sloshing condition.
Experimental and Mechanism Analysis of Chlorination and Reduction of Copper Slag
Authors: Sun Shuchen , Yu Qingchun , Deng Yong , Chen Xiumin , Chen Jing , Zhou Liang
Published: April 2020

Waste copper slag contains large amounts of iron. Carbothermic reduction of the copper slag to recover iron inevitably results in the co-production of copper, which causes brittleness and poses a significant cost to remove. In this work, the method of medium-temperature (MT) chlorination by sodium chloride and high-temperature (HT) reduction by carbon is used to remove copper selectively before the recovery of iron. The composition of raw materials and the products were analyzed by X-ray diffraction (XRD), and chemical analysis. It was found that excessive carbon and high temperature were unfavorable to the removal of copper from the copper slag. Cu2S and Cu can be chlorinated by sodium chloride and evaporates in the form of CuCl gas. Meanwhile, chlorination mechanism of copper slag was discussed.
Experimental Study on Inhibition of Hydrate Formation by Compound Solution of PVP and Ethylene Glycol Ether
Authors: Liu Xiaolan , Zheng Yong
Published: April 2020

Kinetic inhibitor is an inhibitor of many studies in the field of natural gas hydrate inhibitor in recent years. In view of the inhibition of hydrate effect is obvious, high cost, so this paper carried out several inhibitors to inhibit the formation of gas hydrate, in order to meet the need of gas hydrate inhibition, but also take the economic factor into account. It was found that the synergistic effect of PVP and ethylene glycol two ether, ethylene glycol two ether and ethylene glycol phenyl ether in the inhibition of gas hydrate, and the synergistic effect of ethylene glycol phenyl ether was the most significant.
A Study on Transverse Magnetic Wave Propagation Characteristics of Dielectric Wrapped Wire
Authors: Meng Fanbo , Li Ran , Wang Dongdong , Fu Taiyi , Zhang Tianshi , Feng Beibei , Qiu Sihai
Published: April 2020

The transverse magnetic wave propagation characteristics of the dielectric wrapped wires are studied. The transverse magnetic wave transmission model of a dielectric wrapped wire is revised based on the variable seperation method. The spatial relationship between electromagnetic wave emission and reflection is obtained. An experiment is developed using the new actuator and coupler. The results show that the surface wave guide formed by a single wire wrapped in a low loss medium can ben used as a high speed data transmission channel.
Research Status of Relationship between Seismic Instrument Intensity and Ground Motion Parameters
Authors: Ma Pengju , Wang Haiyun , Jiang Weiping , Zhang Xu
Published: April 2020

Seismic intensity can simply reflect the extent and distribution of earthquake’s impact and damage. A comprehensive and detailed assessment of intensity requires a long time and a lot of manpower and material resources. The ambiguity of the intensity assessment index and the subjectivity of the professionals often result in differences in assessment results. Seismic instrument intensity based on strong earthquake observation records can effectively avoid the above problems, and can quickly and objectively assess the impact and possible damage degree of the surface near the strong earthquake station. This paper summarizes the research progress of seismic instrument intensity and points out the development direction of seismic instrument intensity.
Study on Lateral Bearing Capacity of Cantilever Rigid Piles under Large Horizontal Displacement
Authors: Feng Zhongju , Min Wu , Kai Feng , Guan Jiang , Dong Yunxiu , Yin Jixing , Bai Shaofen
Published: April 2020

In order to analyze the lateral ultimate bearing capacity of cantilever rigid pile with large horizontal displacement, this paper studies the distribution characteristics of soil resistance on the side of pile and the calculation method of lateral bearing capacity of pile foundation by means of numerical simulation and theory. The results show that under the condition of large displacement, the soil in front of the pile is yielded layer by layer from top to bottom, and when the soil layer on the side of the pile reaches the limit displacement, the soil resistance on the side of the pile no longer increases with the increase of displacement. The lateral ultimate bearing capacity of cantilever rigid pile under large horizontal displacement is fitted and calculated by using the ultimate displacement of pile side soil, in which the fitting effect of modified “m” method is the best, and the applicable range of foundation coefficient distribution needs to be further studied.
Analysis Method of Subjective Uncertainty
Authors: Jitao Yao , Mingdong Yan , Bin Huang
Published: April 2020

Understanding the uncertainty of objective things in actual engineering is inevitable, and it has a direct impact on engineering decision-making. In view of this, there are many theories—fuzzy mathematics, evidence theory and other related theories have been put forward, and which have been widely applied in practical engineering at present. However, these theories are based on their specific uncertainties, which are large different from each other and do not completely reveal the common attributes of such uncertainties. In this paper, a basic analysis method of subjective uncertainty is established by based on the concepts of degree of belief and unascertained quantity. The paper will introduce the axiomatic operation rules of degree of belief, and further elaborate the subjective uncertainty analysis method. Based on the basic analysis methods of fuzzy mathematics and evidence theory, a unified method of subjective uncertainty analysis is reviewed and improved. It can help to establish a unified understanding of subjective uncertainty, and can help to comprehensively analyze the influence of various subjective uncertainties on engineering decision-making.
Research on post-buckling performance of grid composite members
Authors: Li Chao , Wang Menghong , Cao Xiaonan
Published: April 2020

In this paper, the combination of simulation and experiment is used to study the performance of composite members after buckling. Considering the influence of initial defects on the buckling performance of the members, using the basic theory of contact and friction and the method of nonlinear analysis, the model of the composite members was established by ABAQUS finite element software and analyzed. At the same time, the compression test of the composite member was carried out to verify the correctness of the simulation. Finally, the calculated length coefficient of the composite member are obtained, which lays a foundation for the overall analysis of the long-span space grid structure.
Analysis and correction of stress error in construction monitoring of cantilever cast prestressed beam bridge
Authors: Pan Zhi shun
Published: April 2020

In order to correct the monitoring stress of long-span prestressed concrete girder more accurately, and consider the characteristics of bridge load gradually applied during cantilever construction, this paper proposes an accurate correction method for monitoring stress of long-span prestressed concrete bridge. Based on the linear creep theory and Bauer boltzmann (L.B oltzman) superposition principle, the invariant elastic mode of traditional calculation isreplaced by the equivalent elastic modulus from load-to-pre-calculation, and the formula of concrete creep, and the time-varying elastic mode is taken into account. The effect of concrete shrinkage and temperature change softer on the real stress value of the structure is accurately corrected by separating and removing stress-free strain from the measured strain. This method is applied to the calculation of the measured stress in the key section of the main beam of a long-span continuous beam of a high-speed railway. The results show that the modified stress value is in good agreement with the theoretical value and the error is significantly reduced, which verifies the reliability and accuracy of the modified method.
Calculation and Analysis of Box Girder Temperature Effect of Large Cantilever Bridge under the Solar Radiation
Authors: Cheng Wang , Wenchao Liu , Chen Zheng
Published: April 2020

This paper analyzes the influence of solar radiation on the prestressed concrete wide box girder with a large cantilever. The experimental research is carried out by arranging the embedded deformation monitoring sensor, and the actual temperature deformation curve of the large cantilever box girder subjected to solar radiation is obtained. Besides, the deformation calculation model of box girder under the influence of solar radiation is established by ANSYS finite element software, so as to obtain the deformation distribution of large cantilever prestressed concrete under solar radiation. Calculation results are fitting well in with the actual tested results, with an average error of 7.97%. As the boundary conditions are quite ideal, the tested results tend to be larger. Relative studies can provide some guidance and suggestions for the deformation control and design of this type of bridge.
Data Center Airflow Organization Optimization Based on Entransy Loss Evaluation
Authors: Fang Liu , Kaize Xing , Zhigang Wang
Published: April 2020

Refrigeration system is an important part of high-efficiency data centers. Air distribution optimization is an important means of energy saving in the air conditioning system. In this paper, aiming at the shortcomings of the existing evaluation indexes of air distribution in data center, the Entransy loss method based on the thermodynamics principle is applied to the evaluation of air distribution in the data center. Taking a standardized data center as the research object, CFD is used to simulate the four working conditions of its cold and hot channels. The results show that the thermal Entransy loss can effectively evaluate the cooling capacity utilization of different airflow organization forms, which provides a theoretical basis for optimizing the airflow organization and evaluating the heat transfer performance of the entire engine room. The results show that the thermal Entransy loss can effectively evaluate the cooling capacity utilization of different airflow organization forms, which provides a theoretical basis for optimizing the airflow organization and evaluating the heat transfer performance of the entire engine room.
Parameter Estimation of Muskingum Model based on Whale Optimization Algorithm with Elite Opposition-based Learning
Authors: Qiang Zou , Qiaoping Fu , Xingjun Hong , Jun Lu
Published: April 2020

In order to solve the problem of complexity and poor accuracy for parameter estimation of Muskingum model, the Whale Optimization Algorithm with Elite Opposition- based Learning (EOWOA) was established to estimate the parameters of Muskingum model. EOWOA used the elite opposition-based learning to improve the whole search capability of WOA, and the evolution process can be quickened, moreover the convergence speed and accuracy was also improved. And the benchmark function tests demonstrated that EOWOA outperforms DE, PSO and WOA. Finally, the results of application showed that IWOA can effectively estimate the parameters of Muskingum model, and the precision of this method wins great satisfaction, thus to provide a new way in the field of channel flood routing.
Simulation Analysis on Force Characteristics of Transmission Tower by Foundation Settlement
Authors: Dong Boyuan , Chen Kongliang
Published: April 2020

In order to study the foundation foundation settlement under the most unfavorable conditions for the comparative analysis of the internal force development and deformation of the transmission tower and its jack-up electric tower, combined with the finite element structural analysis software Midas, a 110kv transmission tower and its jack-up tower are carried out. Modeling and comparative analysis. In this paper, the corresponding laws are summarized, and suggestions for the design of the jack-up electric tower under the action of foundation displacement are proposed for designers’ reference.
Strength Research and Structure Improvement of a Semitrailer Based on Finite Element Method
Authors: Chen Yajuan
Published: April 2020

Based on the finite element theory, the analysis model of semitrailer is established. On this basis, the limit condition method is applied to simulate the stress level of the structure under four typical working conditions including bending, torsion, turning and emergency braking. The weak areas with insufficient strength are found out. Meanwhile, it proposes corresponding improvement measures based on the analysis results to provide a theoretical basis for the structural design engineer.
Load Transfer Law and Influence Factors of Piles in Deep Loess Area
Authors: Cao Lixiang , Du Ting , Yan Tiecheng , Liu Liping , He Xinyao
Published: April 2020

This paper summarizes the characteristic of four kinds composite foundation - compacted concrete composite foundation, Lanzhou loess foundation, highway soft soil foundation, just - soft pile composite foundation. Based on load tests and pile stress analysis of the measured data, summarizes the four foundation pile load characteristics and load transfer mechanism. The factors that influence the pile load transfer law are those: the pile tip soil properties, Pile shaft stiffness and length to diameter ratio, cement mixing ratio, Soil types, Moisture content, Compactness, The use of mattress layer.
Creative Application of Steel Cylinder Structure in Anchorage of Ultra-long Suspension Bridge
Authors: Xu Binbin , Li Yiyong
Published: April 2020

The damage of anchorage itself and the instability of surrounding rock around the anchorage are difficult to construct. It is very difficult to analyse and summarize the possible failure modes of the anchorage from the perspective of engineering examples because of the safety of the existing suspension bridge tunnel anchorage. The steel cylinder anchorage structure is innovatively put forward in this paper.
Study on thin plates under thermal action
Authors: Zhang WX , Yang LM
Published: April 2020

Under the Hamilton system, the dual form governing equations of thin plate problems are established using displacements and stresses as the basic variables, and the problem is accordingly transformed into finding the eigenvalues and eigensolutions by adopting the method of separation of variables. Furthermore, solutions for zero eigenvalues and non-zero eigenvalues are systematic studied. The study shows that zero eigensolutions are composed of all the overall deformation solutions such as the traditional tension and bending problems, while non-zero eigensolutions include the torsion and bending groups charactered by local deformations.
Study on stress concentration of elastic plates under special constraints
Authors: Zhang WX
Published: April 2020

The dual form differential governing equations for elastic thin plates widely used in the engineering practice are established in the state space formalism, and the complete solution space is obtained, including zero eigensolutions and nonzero eigensolutions. Moreover, the problems of the non-homogeneous lateral boundary conditions and the non-homogeneous governing equations are studied systematically. In numerical examples, we discussed stress distributions for the bending problems of thin plates, and analyzed the stress concentrations due to displacement boundary constrains using the analytical method.
Numerical Study on Rock Stability and Mechanical Characteristics of Supporting Structure of Water Tunnel with Different Buried Depths
Authors: Liu Qi , Zhi Chengjie , Li Jianhe , Ning Xinyang , Tian Zhenyu , Han Jian
Published: April 2020

To explore the suitability of the supporting scheme of horseshoe tunnel affected by different buried depths in phyllite rock, the 3D numerical tunnelling simulations were conducted. The plastic zone distribution, deformation characteristics and stress field of surrounding rock and mechanical characteristics of supporting structures during the excavation process were analyzed. It was shown that the plastic zone depth, volume and deformation development of the surrounding rock are greatly limited by the shotcrete-bolt support under different buried depths. Meanwhile, the restriction proportion to the development of the plastic zone and rock deformation is slightly affected by the buried depth of the tunnel. With the increase of the buried depth of the tunnel, the reasonable shortest distance that should be reserved between the constructed lining and tunnel face also gradually increases. Combined with the calculated tunnel deformation and the classification standard proposed by Hoek, it is recommended to adopt full-section shotcrete-bolt support, and add steel arch support as the necessary supplement for the existing tunnel supporting scheme. The research results contribute to design and construction guidance for tunnels under similar geological environments.
Analysis and Study on Mechanical Properties of GFRP Tubes
Authors: Du Wenqi
Published: April 2020

Glass fiber reinforced polymer (GFRP) is a new kind of composite material, which combines the advantages of steel bar and concrete, and has the advantages of high strength, strong corrosion resistance and anti-fatigue, etc. In recent years, it has been more and more applied in civil engineering, port, channel and coastal engineering, bridge engineering and other special structures. GFRP material can significantly improve the corrosion resistance of concrete material, and solve the problem that concrete material is prone to corrosion and lead to structure failure in complex environment. At present, the technology is developing rapidly at home and abroad, but in our country, to really apply it widely in engineering construction, we need to further study and analyze the properties of GFRP pipe - concrete composite structure. In this paper, it is concluded that with the increase of eccentricity, the bias bearing capacity of the specimen decreases gradually. With the increase of concrete strength grade, the ultimate bearing capacity is improved. The concrete grade has a great influence on the performance of the specimen. The higher the concrete strength, the stronger the bearing capacity of the structure. The bending performance of GFRP tube composite structure is good.
Damage Detection Method of Ancient Timber Structure Based on BP Neural Network and Total Wavelet Energy Rate
Authors: Hu Weibing , Yang Jia , Hou Yanfang
Published: April 2020

In order to detect the damage of beams and mortise joints of ancient buildings under environmental excitation, a damage identification method combining wavelet transform with improved BP neural network is proposed. The acceleration signal of the structure under the environment excitation is extracted and the total energy change rate of wavelet is obtained by wavelet discrete reconstruction, which is taken as the damage index. A finite element model of a timber frame of Xi’an bell tower is established to verify the proposed method. When the damage extent is less than 50%, 96% of the test samples in the neural network output the desired value; This method provides a theoretical basis for the study of damage prediction of timber structures in ancient buildings under environmental incentives.
Numerical investigation of ALSTON turbine generator foundations using different finite element model
Authors: Xu Li , Li Hongbo , Gao Xiaolong
Published: April 2020

ALSTOM turbine generators have been used in the power plant all over the world. The previous turbine generator foundations were mainly designed and analyzed by the professional design software. In this paper, FE models using frame element in the finite element software of SAP2000 and solid elements in the finite element software of ABAQUS were built to simulate the ALSTOM turbine generator foundation, respectively. Model analysis and forced vibration analysis were conducted and the simulation results were validated against the existing codes and specifications provided by manufactory. The dynamic characteristics of the turbine generator foundation could meet the requirements of the applicable codes and standards. The FE models built with solid element could better simulate the dynamic characteristics of turbine generator foundations.
Comparative In-situ Test and Numerical Simulation on Underreamed Ground Anchor
Authors: Guo Gang , Xue Zizhou , Hu Xiaochen , Zhong Guang , Liu Zhong
Published: April 2020

Underreamed ground anchor is an anchorage technology of safety and economy. Engineering companies worldwide developed various types of underreamed anchors with partially enlarged anchor body. In recent years, a kind of cylindrical underreamed ground anchor with geotextile bag is applied in China. Because of its corrosion resistant performance and high construction guarantee rate, the underreamed ground anchor with geotextile bag is widely recognized. In order to study its mechanical performance, a comparative in-situ test between the underreamed anchor and normal shaft anchor is held in China. Through the test, the advantages of bearing capacity and deformation performance are analyzed. Based on the test, the numerical model of cylindrical underreamed anchor is established, and the relationship between its capacity and the response of the surrounding soil is researched.
Discussion on Application of BIM Technology in Aluminum Alloy Formwork Support System
Authors: Longbo Zhang
Published: April 2020

With the development of science and technology, society has put forward more stringent requirements for the construction industry. The traditional two-dimensional design method can no longer meet the requirements of architectural design. The proposal of BIM technology and its application in the construction industry have solved the problems existing in traditional architectural design methods and adapted to the long-term development needs of architectural design. In the design of aluminum alloy formwork support system, BIM technology can realize efficient processing and management of massive data, realize informationization and integrated management of project design, and effectively improve the quality of project design. In view of this, the author believes that it is necessary to analyze the application of BIM technology in the design of aluminum alloy template support system. Based on the overview of this new technology, this paper will analyze and discuss the application and practical application of BIM technology in the design of aluminum alloy template support system.
Analysis on the Application of BIM and RFID in Life Cycle Management of Prefabricated Building
Authors: Wu Shuhai , Liu Qing
Published: April 2020

In the whole life cycle of prefabricated building construction, the application of BIM and RFID technology can solve the problems that traditional architectural design and construction methods cannot solve, by improving the precision and efficiency of architectural design and construction and guaranteeing the construction quality of buildings. In this paper, the application value of BIM and RFID technology in the whole life cycle of fabricated buildings is systematically analyzed. And this article explores the methods for participants to edit the building information model in a timely manner and the technical system for communicating and connecting information data at each stage. Finally, it provides theoretical support for the development of life cycle management of prefabricated buildings.
Research on 4D Visual BIM Technology in Dynamic Decora-tion Building Site Construction
Authors: Huang Xin-yao , Lee Kun-Fa
Published: April 2020

Exploring BIM 4D visualization technology applied to the dynamic construction site of residential decoration and decoration. The Project and Revit models were built by Autodest Navisworks software from different angles, and customized solutions were modified according to customer needs to meet the internal needs of today’s fashionable residential decoration.
Cooperative Path Planning Based on Pattern Genetic Algorithm
Authors: Mi WEN , Jing WEN , Qiang FANG , Yi-ming ZHANG , Zuo-wei YAO
Published: April 2020

In order to solve the problem of low “population” effectiveness of genetic algorithm in multi-vehicle route planning, this paper proposes a pattern-based genetic algorithm. The algorithm uses the limited way of “route pattern”, which can greatly improve the effectiveness of population generation, crossover and mutation, thus reducing the iteration times of the algorithm and improving the convergence efficiency. The pattern-based genetic algorithm is applied to the cooperative path planning of multiple aircraft. The algorithm flow of cooperative path planning is designed. An example is given to prove its effectiveness and efficiency.
Improved multi-objective sensor optimization method for structural damage identification based on genetic algorithm
Authors: Zhang Jun , Zhang Kun
Published: April 2020

An improved multi-objective sensor location optimization method based on genetic algorithm is proposed. According to the analytic relationship between structural response, mode shapes and damage quantities, the sensitivity matrix of structural dynamic response containing both structural modal information and damage information is firstly constructed, and then the objective function of multi-objective sensor location optimization method is established according to the minimum identification error criterion and the principle of ill- posedness in the inverse problem. In addition, a multi-objective genetic algorithm, NSGA-II, is used to solve the optimal location of measurement points. Finally, a simply supported box girder bridge is studied for validating the proposed method. Numerical simulations show that the improved optimization method based on genetic algorithm can achieve the optimization goal better, and the measurement points optimized by the improved method can get better damage identification results at the same level of measurement noise.
Prediction of compressive strength of mortar near sodium chloride by artificial neural network
Authors: Lin Yuezhong , Li Yongqian , Li Xiaomin
Published: April 2020

The compressive strength value of cement mortar is usually affected by the amount of sodium chloride, chemical admixture and cement grade. Therefore, the artificial neural network model is used to predict the mortar strength values of different cement grades and sodium chloride (NaCl) content. In order to predict the compressive strength of the mortar, an artificial neural network model of cement grade, different water-cement ratio, sodium chloride solution content, an output neuron and four input neurons was established. After immersion in 0%, 5%, and 10% sodium trichloride solution for 60 days, the compressive strength was measured using 12 different ratios. Artificial neural network (ANN) analysis shows that ANN as a nonlinear statistical data modeling tool can establish a strong correlation between sodium chloride content and compressive strength of cement mortar. In addition, modeling tools have a greater impact on different cement grades (42.5, 32.5 MPa).
Seismic performance factors of RC frames with infilled walls based on APOA and IDA
Authors: Yanjun LI , Dagang LU , Zhenyu WANG
Published: April 2020

Seismic performance factors are important parts of performance-based seismic design, and values of seismic performance factors are directly related to structural safety and economy. Six typical RC structures in high intensity region are designed according to the current Chinese Codes, and finite element models are built on OpenSees platform. The objectivity and accuracy of modeling methods are verified by existing experimental results. Values and rules of seismic performance factors are revealed by adaptive pushover analysis (APOA) and incremental dynamic analysis (IDA). Through comparison with values of design codes, values of the system overstrength factor, the ductility reduction factor, the response modification factor and the deflection amplification factor in this paper is reasonable, and this study provides theoretical reference for Chinese Codes. Analytical methods have important effect on seismic performance factors. Comparing with the IDA method, the APOA method underestimates seismic performance factors. Structural height has significant influence on seismic performance factors. Overstrength factor increases with increase of structural height but ductility reduction factor, response modification factor and deflection amplification factor decrease. Infilled walls increase seismic performance factors of RC frame with infilled walls. The effect of infilled walls on seismic performance factors decreases gradually with increase of structural height.
Study on the influence law of complex curtain horizontal freezing and freezing on the surrounding environment
Authors: Yu Changyi
Published: April 2020

Freezing up is one of the problems that are paid close attention to in the construction of artificial freezing method, especially the horizontal freezing up of complex curtain is difficult to be calculated by theoretical formula. The adaptability of numerical calculation is strong. In this paper, numerical calculation method is used to simulate the horizontal freezing and freezing expansion of complex curtain. Thermophysical parameters considered in the simulation change with the change of temperature field. Thermodynamic parameters of each point in soil are given by way of field variables, which provides ideas and methods for accurately simulating the horizontal freezing and freezing expansion displacement field of complex curtain.
Research on the development law of temperature field in horizontal freezing and melting of complex curtain
Authors: Yu Changyi
Published: April 2020

Artificial freezing method has been widely used in various underground projects, but the development law of melting temperature field of complex curtain is difficult to be calculated by analytical method. As a general method, numerical method is feasible to simulate the development of temperature field in horizontal melting of complex curtain. Based on the freezing construction of a subway connecting passage, this paper analyzes the law of temperature field development in the melting process, and proves the feasibility of this method by comparing with the measured data. The results can be used to guide the design and construction of artificial freezing.
An Atmospheric Correction Algorithm For GF-2 Image Based On Radiative Transfer Model
Authors: Cao Hongye , Han Ling , Zhang Tianqi , Li Liangzhi
Published: April 2020

The accuracy of atmospheric correction is a key factor affecting the quantitative application of GF-2 satellite. Due to the lack of short-wave infrared band in GF-2, it is impossible to use method of dark pixel for atmospheric correction. Therefore, a method of atmospheric correction coefficient lookup table (LUT) based on 6S (Second Simulation of the Satellite Signal in the Solar Spectrum) radiation transfer model and aerosol optical thickness (AOT) parameters retrieved from MODIS data is proposed, and the atmospheric correction of GF-2 satellite multispectral data is carried out. Dunhuang radiation correction field with flat and uniform surface is selected as the experimental area. The accuracy of the correction results is evaluated by synchronous measured data, and the normalized vegetation index NDVI before and after atmospheric correction is compared. The results show that the minimum relative error is only 0.9%. The image data after atmospheric correction can more truly reflect the reflection characteristics of ground objects. NDVI after atmospheric correction greatly enhances the contrast of vegetation information and highlights the ability of vegetation information discrimination of GF-2 satellite sensor.