bluuebunny/crossref_metadata_2025_split huggingface dataset:
A Prediction Model of Tunnel Surrounding Rock Deformation Based on Induced Ordered Weighted Averaging Theory and its Application
Authors: Fan Fangfang , Jian LI 
Published: June 2019

Abstract
For the different prediction accuracy of tunnel surrounding rock deformation prediction model are different. Based on induced ordered weighted averaging theory(IOWA), IOWA modified combined forecasting model of tunnel surrounding rock deformation has been put forward with the relationship between the accuracy and the weight of a single prediction model. With the monitoring data of Mila Mountain tunnel of highways from Lasa to Linzhi, coupling the time series prediction model of deformation and exponential smoothing model of two kinds of single tunnel, IOWA modified combination prediction model for tunnel surrounding rock deformation has been built up. The result shows that predicted displacement of IOWA modified combination prediction model for tunnel surrounding rock deformation is closer to the measured value and has higher accuracy. The combined model for the prediction of tunnel surrounding rock deformation is feasible.
Study on Effect of Late Tunnels on Deformation of Early Tunnel in Three Small Net Distance Tunnels
Authors: Jiao Ping , Ma Liang , Wu Yongzhen , Liu Yan 
Published: June 2019

Abstract
This paper is based on the tunnels construction in small net distance in Jinan Rail Transit Line R3. The deformation of early mining tunnel when double-line shield tunneling under different net distance conditions is simulated. The results show that the late shield tunneling will cause the clearance convergence, vault settlement and inverted arch uplift of the early mining tunnel to further deformation. When the distance is 0.8 times of the tunnel diameter, reinforcement measures are needed.
Numerical Study on Dynamic Buckling of Composite Bar with One Edge Simply Supported and Opposite Edge Clamped
Authors: Liu Chao , Yang Qiang , Han Zhijun 
Published: June 2019

Abstract
Considering the stress wave effect, the dynamic buckling problem of a composite rod with one side fixed on one side being axially impacted by a rigid mass is studied. Based on the Hamilton principle and the axial inertia and rotational inertia, the dynamic buckling control equation is derived. For the dimensionless, the central differential method is used to solve the governing equation. The buckling mode of the composite bar with different initial deflections under different impact mass, impact velocity, critical length and layup mode is obtained by B-R criterion. The results show that the impact velocity, impact mass, critical length and layup mode have an effect on the dynamic buckling of composite rods, and the initial deflection changes have a significant effect on the buckling mode.
Research on the Aerodynamic Characteristics of Vehicle Passing out Tunnel
Authors: Wang Gui-hua , Zhou Ji-guo 
Published: June 2019

Abstract
Taking bus driving out of the tunnel as the research background, study the aerodynamic characteristics of the vehicle when the vehicles subjected the sudden change wind load. Numerical wind tunnel model is established. Respectively analysis the vehicle’s aerodynamic change rule of three-component coefficients in the process of vehicle driving out tunnel at different speed under wind load and without wind load. The results show the vehicle’s aerodynamic force increases suddenly when the vehicle run out of the tunnel. The suddenly increasing pressure on vehicle is very adverse impact on the driver’s operation and driving safety.
Creep Fibre Method of Simply-supported Composite Beams
Authors: Zhang Shengping , Chen Xu , Wang Fengxian 
Published: June 2019

Abstract
Creep effects of composite beams can not be neglected in service-time. Creep Fiber method is used to obtain the time-depedent results, which proved to be quiet effect in both elastic and visco-elastic analysis. Only two individual centrical loading points or bars need considering, and then the system of two sumultaneous differential equations becomes simple in a clear fashion. It can be solved analyically by Rüsch constitutive equation of creep. For high and large beams of bridge structures the fibres of the two points are constant over time because the radius of inertial of steel beam is far larger than that of concrete slab, which simplifies the procedure further. The results show that under sustained loading creep of concrete produces significant negative effects. It may increase the modular ratio to 2.3 times of the initial, reduce the whole flexural stiffness by 76%, and cause the local buckling risk of the top flange and web of steel beam. These should be considered in the design of structure.
Experimental Study on Seismic Performance of Prefabricated Joints of Underground Utility Tunnel
Authors: Hu Yaoxing , Li Zhengying , He Jijun , Huang Zulin 
Published: June 2019

Abstract
In order to study the seismic performance of underground utility tunnel prefabricated joints anchored by button-head reinforcement, pseudo-static tests were carried out on two full-scale underground utility tunnel prefabricated joint specimens. The failure mode, bearing capacity, energy dissipation, and other seismic performance of the joints were analyzed. The results show that the bearing capacity, energy dissipation and other seismic performance parameter of these specimens can meet the seismic design requirements. However, the damage in the core area of the joint is severe under the pseudo-static loading. Therefore, when the button-head reinforcement is applied to practical engineering, necessary reinforcement measures should be taken to ensure that the joint has good seismic performance.
Test Design and Finite Element Analysis of Shaking Table of Concrete Frame Structure Reinforced with CFRP Bars
Authors: Wang Jianyue , Xu Xinsheng 
Published: June 2019

Abstract
The shaking table test is an irreversible process for a nonlinear model structure. Therefore, how to choose ground motion and determine the input sequence are particularly important for the success of the shaking table test. In this paper, a 1/4 scale CFRP reinforced concrete frame structure specimen model is designed and made according to the similarity theory. By using the finite element analysis software SAP2000, the finite element model of CFRP reinforced concrete frame specimen is established. Four seismic waves are selected in the simulated shaking table test process, and the dynamic time history analysis of a total of 52 working conditions is carried out, including unidirectional, bidirectional and three-directional ground motion input, and the acceleration and displacement response of the structure are obtained. Taking story drift ratio as the evaluation index, the seismic performance of the structure is evaluated. This paper provides theoretical guidance for the subsequent shaking table test.
Finite Element Analysis and Influence Factors of Flexural Behavior of HFRP Reinforced Concrete Beams
Authors: Yang Shuai , Xu Xinsheng 
Published: June 2019

Abstract
HFRP (Hybrid Fiber Reinforced Plastics) ribs are a new type of composite rib made of a mixture of two or more continuous reinforcing fibers. Since the HFRP ribs have a "pseudo-yield" phase similar to that of steel bars, the mechanical properties of HFRP reinforced concrete structures are quite different from those of single FRP reinforced concrete, and should be studied in depth. In this paper, the finite element analysis of the hybrid effect of HFRP bars and the flexural behaviour of HFRP reinforced concrete beams is carried out. The ANSYS finite element analysis software is used to simulate the bending test of carbon/glass HFRP reinforced concrete beams with three different hybrid ratios. The calculation results are compared with the experimental results, and the rationality of the finite element model is verified. On this basis, the influence of mixing ratio, reinforcement ratio and concrete strength on the deflection of concrete beams is further analysed.
Finite Element Analysis of Dynamic Behavior of CFRP Reinforced Concrete Frame
Authors: Zhang Haoyu , Xu Xinsheng 
Published: June 2019

Abstract
At present, the research on the performance of CFRP reinforced concrete structures at home and abroad mainly focuses on the ductility of individual members, especially FRP reinforced beams and columns, while the research on the ductility and seismic performance of FRP reinforced concrete frame structures is relatively less. Firstly, the finite element model of the shaking table test scale model of CFRP reinforced concrete frame structure is established by using SAP2000 finite element analysis software. Then, the non-linear dynamic time-history load condition is defined for the model, and the dynamic elastic-plastic time-history analysis is carried out to obtain the acceleration response and displacement response of the model under different levels of earthquake. The results show that the CFRP reinforced concrete frame structure is damaged and its stiffness deteriorates seriously. The lateral deformation of the structure is mainly caused by the bending deformation of the beam and column, while the lateral displacement of the column caused by the axial deformation is relatively small.
Comparison and Selection of Reinforcement Schemes for Shield Tunnelling Close Crossing High-speed Railway Viaduct Group
Authors: Wu Bo , Zhang Ziyi , Huang Wei 
Published: June 2019

Abstract
Numerical simulation is carried out of the group pile foundation project of the shield tunnel on Nanjing metro airport line which crossing Beijing-Shanghai high-speed railway. The paper analysed the characteristics of the horizontal displacement along bridge of the pile foundation during the whole crossing process. On this basis, the reinforcement effects of grouting reinforcement, longitudinal beam and cross bracing reinforcement, bored cast-in-place pile reinforcement are comparative analysed with the horizontal displacement alone bridge of pile as the evaluation index. Also, the feasible program of the shelter pile reinforcement could be determined by combing with the construction process and conditions.
Laboratory Tests for the Consolidation Property of Dredger Fill in the Shenzhen Area
Authors: Zheng Airong , LI Dongjun 
Published: June 2019

Abstract
In order to analyze the special engineering properties of the super soft dredger fill, experimental studies had been done on the physical-mechanical properties of that in Shenzhen, especially for its consolidation properties. The test results indicated that the super soft dredger fill had the properties of high water content, high void ratio and high clay content; When the confining pressure applied to the sample was less than 200kPa, the change of deformation and void ratio of it was more obvious; When the confining pressure applied to the sample was less than 80kPa, the chang of permeability coefficient of that was more significant.
Multi-objective Optimization Configuration of Capacitor Blocking Devices based on Field-Circuit Coupled Model and Improved Differential Evolution Algorithm
Authors: Zeng Wenhui , Ren Hao , Tang Yang , Ni Jiang , Chen Xin 
Published: June 2019

Abstract
The dc current of grounding pole will invade the transformer windings nearby when the HVDC system is in ground return operation, which will cause DC bias and affect the safety and stability of the system. It is an effective method to restrain dc current in transformer to install capacitor blocking devices at transformer neutral wire, but it is shown that this may increase the bias current of nearby transformers. For this reason, the installation of blocking device in a certain area can be considered as an optimization problem. An improved differential evolution algorithm is proposed to optimize the multi-objective configuration of capacitor blocking devices to suppress DC bias globally. The field-circuit coupled model is established to solve the potential. The objective function is to minimize the number of installations of the devices and the absolute sum of the total DC current of the transformer in the region, and the constraint is all DC current at the neutral point of each transformer is under the limit, then the optimal configuration model is established. Finally, the chaos mapping theory, adaptive parameters and elitism preservation strategy are introduced into the difference evolution algorithm to solve the model and obtain the optimal allocation scheme.
Design and Implementation of an Intelligent Decision-making System for Power Grid Planning
Authors: Jia Chunrong , Wang Zhou , Fu Bingbin , Shi Yi 
Published: June 2019

Abstract
In order to effectively cope with the situation of large amount of data, complex decision-making and lack of technical means in power grid planning, an intelligent assistant decision-making system for power grid planning based on platform design, visualization and advanced decision support function is designed and implemented. The system is closely integrated with Geographic Information System (GIS) and embedded in an integrated database. It has the functions of adaptability evaluation, investment priority decision-making, power grid reconfiguration scheme analysis and data interface of power grid simulation software. In the process of assistant decision-making, the coordinated evaluation of power supply and power grid is realized by the simulation of power grid dispatch, the investment priority of the project is determined by imitating the principle of static security analysis, the backbone network of power grid is identified by graph theory algorithm, and the data of the planning scheme is extracted from the newly developed simulation software data interface to reconstruct the topology and initialize the data of model.
Research on the Index System of Economic Activity Analysis under Electricity Reform
Authors: Du Yi , Lin Hongyang , Xiang Kangli , Li Yuanfei , Lin Changyong 
Published: June 2019

Abstract
To take the initiative to adapt to the electric power system reform and steadily improve operating benefit, the State Grid Fujian Electric Power Company clarifies the impact of the electricity reform policy on the corporation’s operational activities, actively explores the index system of economic activity analysis under the influence of the new electric power reform environment, quantifies the impact of the power grid reform on the corporation’s production and operation, timely affirms achievements, reveals problems, improves internal management, increases efficiency, and assists the operational decision-making.
Research and design of wind power grid switch for low voltage crossing ability
Authors: Zhang Liu , Ma Shaohua , Gu Cailian , Zou Quanping 
Published: June 2019

Abstract
This paper proposes a new type of wind power grid switch design, according to the requirements of the wind power generation system for grid switch technology, combined with the electromagnetism theory and empirical formula. The new interconnection switching used the characteristics of the high remanence of two-phase magnetic materials to solve the problem such as great power consumption, holding not across low voltage, in view of the traditional electromagnetic grid switch, and then set up new interconnection switching of the three-dimensional entity model, finally used the finite element simulation software, the change of the curve, such as the electromagnetic suction parameters and contact motion speed was obtained, the relationship between the structure parameters and interconnection switch operating characteristics of the contact was also obtained. Finally simulation experiment results show that the new grid switch in the case of no excitation current keeps off state, which can be well applied to wind power generation system, and can effectively improve the stability of large-scale distributed power grid operation, and has a certain theoretical significance and practical value.
The study of NinH(n=1-6) clusters by density functional theory
Authors: Zhang Xiaozhen , Wen Junqing , Bai Liang 
Published: June 2019

AbstractIn this paper, the geometric structures and local relative stability of NinH(n= 1-6) have been systematically calculated using the generalized gradient approximation (GGA) under density functional theory. The studied results indicate that adding an H atom to the Ninclusters does not significantly change the basic structures of Nin, and the most stable structures can be received by adsorbing an H atom on the side of pure Ninclusters. The binding energy of each atom of Ninand NinH show same variation trend, the values of NinH are larger than that of Nin. The fragmentation energy, adsorption energy and HOMO-LUMO gaps don’t show obvious oscillation behavior with cluster size evolution, but the values are larger at Ni6H, which illustrate that the corresponding cluster has high stability and low chemical activity.
Synthesis of spherical Ni0.8Co0.1Mn0.1(OH)2 precursor via hydrothermal method assisted by microfluidics
Authors: Liu Ming-Yue , Tan Jing , Deng Wen-Sheng , Su Yue-Feng , Chen Lai , Liu La 
Published: June 2019

Abstract
Nickel-rich materials have been considered as promising cathode candidates for Li-ion batteries. In this work, the spherical Ni0.8Co0.1Mn0.1(OH)2 precursor with good crystalline is synthesized via a hydrothermal method assisted with microfluidics. The effects of (NH4)2CO3 aqueous solution addition ratio and hydrothermal time on the formation of precursors are investigated comprehensively. The as-obtained precursors after optimization (hydrothermal time of 24 h and the concentration of the (NH4)2CO3 is 0.3 mol/L) display the spherical microstructure with homogenously distribution morphology, which can be clearly observed by scanning electron microscope. This work provides a rational route to controllably prepare the spherical Ni0.8Co0.1Mn0.1(OH)2 precursors.
Investigation of the Effect of Boundary Condition on the Property of TRIP Steel by Finite Element Simulation
Authors: Li J.H. , Deng H.P. , Yu S. 
Published: June 2019

Abstract
TRIP (Transformation induced plasticity) steel combined high strength and high plasticity perfectly, which depend on the micro structure of the material greatly. Residual austenite plays an important role on the micro material transformation and macro property. Different boundary condition makes different stress and strain field of the TRIP steel and induced different residual austenite transformation. Under different compression stress, the residual austenite transformation was different, to predict the micro transformation behavior, investigation of the macro stress character was necessary. Finite element simulation was carried out in this paper to investigate the stress filed of TRIP steel under different boundary condition to predict the micro residual austenite transformation and macro property development.
An Electronic Control Air Suspension System for Commercial Vehicles
Authors: Tan Xiaoyan , HU Jiansheng , Dong Guisheng , Chen Bo 
Published: June 2019

Abstract
At present, the developed countries will air suspension applications in medium and heavy trucks and trailers on the penetration rate of more than 90%. In contrast, due to the influence of commercial vehicle production technology, the utilization rate of air suspension in commercial vehicles is relatively low. The proportion of air suspension used in heavy trucks and trailers is only 5% - 10%.With the rapid development of China’s economy, people’s demand for cars is also getting higher and higher, not only a means of transport, but also on the ride comfort, ride comfort requirements are also getting higher and higher. Foreign advanced electronic control air suspension is also becoming more and more popular, which will inevitably lead to the domestic market demand for electrically controlled air suspension. The author of this article during the Ruian Ruili group Beijing Great Automotive Components Company Limited, the electronically controlled air suspension hardware localization, has made some achievementsand some suggestions.
Electron irradiation effects on the mechanical properties of polyethylene
Authors: Liu Yuming , Yang Xiaoning , Zhao Chunqing , Wang Jinghu 
Published: June 2019

AbstractStudies on space electron radiation effect for evaluating property degradation of space materials are one of the important things for exposing the faults of the materials in orbit. Here the influence of electron flux and energy on the electron irradiation effect of polyethylene that is one of the common materials in spacecraft has been studied. Due to the analysis results of SEM and FTIR, it is proposed that the irradiation damage mechanism of the materials is independent of electron flux and electron energy. The molecular structural modifications and chemical changes of the materials have all occurred after each electron irradiation test. But the degree of damage on the mechanical properties of polyethylene during the electron irradiation test is dependent on electron energy. The mechanical properties of polyethylene will completely be lost after electron irradiation when the energy of electron is above 1 MeV, and the polyethylene will be broken down.
Research on Damping Mode of Passenger Vehicle Air Suspension System
Authors: Chen Bo , Dong Guisheng , Shi Yantao , Tan Xiao Yan 
Published: June 2019

Abstract
With the continuous development of economy in China, the demand of both passenger car volume and its comfort increases.The air suspension system has solved the comfort problem as the times require. At the same time, the reliability of the product has attracted more and more attention from users. This study describes the structure and design principle of the air suspension system, and makes an analysis and Discussion on the key use effect, i. e. the damping effect.
Experiment Study on the Vibration Characteristics of inner Journal of Sliding Bearing
Authors: Wei S H , Lu W X , Wang M H 
Published: June 2019

Abstract
Sliding bearings are widely used in various types of rotating machinery due to the development of modern industry. The oil film pressure produced by the sliding bearing has very strong nonlinear characteristics. In order to study the dynamic characteristics of sliding bearing in experiments, in this paper, a sliding bearing test rig is restructured. A special acquisition system is designed to measure the vibration of the journal in sliding bearing. The acquisition system consists of optical fiber displacement sensors, pre-processor, data acquisition device, host computer. Several experiments were carried out by the test rig under different rotational speeds, different eccentric masses, and different bearing loads. The effects of the rotational speed, eccentric mass and bearing load on the dynamic characteristics are analyzed and some conclusions are obtained which is consistent with the theory.
Application of SA-PSO Algorithm in Parameter Optimization of Dynamic Vibration Absorber
Authors: Zhe-ming Chen , Peng Wang , Jiang-hua Fu , Bao Chen 
Published: June 2019

Abstract
Focus on the noise problem in a 7-segment midsize SUV in the condition of wide open throttle in gear 2, noise testing and finite element analysis were combined to analyze the problem, and it was found that there was a significant resonance band around the frequency of 214 Hz, which was particularly evident under the fourth-order excitation. The frequency of resonance band is close to the second-order modal natural frequency of the sub-frame, The resonance band needs to be eliminated to reduce the noise inside the car. Adopting the scheme of installing a dynamic vibration absorber on the sub-frame to make the second-order modal of the sub-frame avoids the resonance frequency. The simulated annealing algorithm is combined with the particle swarm optimization algorithm to optimize the parameters of the dynamic vibration absorber. A dynamic vibration absorber was designed with optimized parameters and verified by simulation and installed on the car. It was verified that The designed dynamic vibration absorber eliminates the 214Hz resonance band and obviously reduce the noise inside the car.