bluuebunny/crossref_metadata_2025_split huggingface dataset:
Mechanical System Design and Motion Space Analysis For Transmission Line Insulators Laser Deicing Robot
Authors: Niu Jie , Jiang Wei , Zou Dehua , Kuang Jianghua , Liu Lanlan , Qiao Xiaoguang 
Published: August 2021

Abstract
In the cold winter, it is a routine task to deicing on transmission lines in severe cold climate so as to ensure the safety and stable operation of transmission lines. Compared with the traditional contact deicing method for transmission line insulators, the using of laser for transmission line deicing has the advantages of sound deicing effect, no damage to the lines, clean and efficient energy utilization, et al. As the laser energy gradually decays with the increase of distance, this paper proposes a new method to realize laser deicing of short-range transmission line insulator by using UAV equipped with laser. In responds to the dispersion problem of traditional control, this paper fully integrates U AV control and laser control platform, the double have been integrated into one, in the new control platform, the U AV control and laser control can be realized simultaneously, the kinematics model of the laser has been established and its forward and inverse solutions have been solved and analyzed. Finally, simulation experiments verify the validity of the model. Compared with the traditional mode, this deicing mode not only realizes the control integration, but also it is easy to operate. It is especially suitable for the operation in the transmission line field environment, which greatly enhances the robot operation efficiency. At the same time, the simulation of laser head sweeping space and deicing operation motion planning based on the kinematic model show that the system designed in this paper can realize the suspension insulators deicing without blind area. The implementation and promotion of this study has important theoretical significance and practical application value for the practicability of intelligent operation and transmission lines maintenance management.
A Contact Model of Heterogeneous Material by Method of Images
Authors: Li Jianglin , Chen Nan , Li Pu , Jin Xiaoqing 
Published: August 2021

Abstract
Contact analyses of heterogeneous materials may find crucial applications in many tribological studies. However, the simulations of such analyses may be difficult to be implemented since the nonlinear behaviors caused by the material heterogeneity and contact may be more complicated. Based on Eshelby’s equivalent inclusion method (EIM), an arbitrarily shaped inhomogeneity interacting with a contact load may be evaluated by an equivalent inclusion model with a contact load, where the influences of the boundary surface are taken into account through the method of images. In order to improve the computational efficiency, a two-dimensional fast Fourier transform based algorithms (2D-FFT) with zero padding and wrap-around order are employed to solve the contact problem. To benchmark the present solutions, an elastic half-space containing inhomogeneities under Hertzian-type contact load is considered, and parametric studies are further performed to demonstrate the effects of elastic modulus and depth on the stress field.
A Numerical Study of Oil Cavitation in a Refueling Pipe
Authors: Liu Nan , Shao Weiguang , Yang Ye , Yin Haojie , He Qiyang 
Published: August 2021

Abstract
The issue of cavitation of oil in a pipe is a concerning problem in the design of a high-speed refueling device. This paper established a CFD model for the fluid flow of oil in a refueling pipe based on FLUENT and applied a combined VOF multiphase model and Schnerr-Sauer cavitation model to simulate the cavitation behavior as the oil flows around obstacles in a pipe. The effects of refueling speed, obstacle structure, and pipe diameter on the cavitation were numerically studied using the combined model, and the volume and mass rates of cavitation and their distribution characteristics were obtained. The numerical results show that: the cavitation is strong behind the obstacle, which presents a length of 217 mm, maximum volume rate 53%, and maximum mass rate 0.18% as the refueling speed is 10 m/s; reducing the inlet velocity and increasing the pipe diameter can dramatically weaken the cavitation behavior; adding more obstacles leads the cavitation area reduces first and then keep stable gradually, in which the cavitation phenomenon starts from the first obstacle; placing the obstacles alternatively in the pipe can significantly intensify the cavitation, while the cavitation always starts from the last obstacle.
Process Analysis of Fragment Penetrating Natural Rubber Material
Authors: Hong Dou , Li Wenbin , Zheng Yu , Jiang Ning , Pu Bo 
Published: August 2021

Abstract
The anti penetration characteristics of natural rubber and the influence of fragment velocity on penetration energy were studied. Through the experimental study, the ultimate penetration velocity of different diameter fragments penetrating different thickness rubber target is obtained, and the penetration process is analyzed. The damage characteristics of target are explained through different stages of penetration. At the same time, the influence law of different residual velocity on the expansion velocity of rubber fragment cloud behind target is obtained, the energy required for the fragments to penetrate the target and the expansion velocity of the fragments after the target will increase with the increase of the fragments’ entry velocity.
Harmonic Component Analysis of Mode Shapes for Packeted Bladed Disk
Authors: Wang Rui , Xu Zili , Luo Jian , Lv Hongshui 
Published: August 2021

Abstract
Vibration characteristics of packeted bladed disk is complicated. To study the vibration characteristics of the governing stage bladed disk of 660mw steam turbine, cyclic symmetry method is used to calculate the mode shapes. Fourier transformation of vibration distribution in the tangential and axial direction along the circumferential of the bladed disk is applied to obtain the harmonic components. It is found that the Fourier decomposition of each blade displacement contains not only unique component, but also other components. For integrally shrouded blades, the resonance of the m nodal diameter mode can be obtained only when the corresponding natural frequency satisfies the condition ωn
= kn = mn, where n is the rotational speed and m is the harmonic number. For packeted bladed disk, there are additional harmonics that resonance occurs. The harmonic components are related to the nodal diameter number when the number of blades groups and the total number of blades are given. The diagrammatic method is applied to predict the wavenumbers present in modulated eigenfunctions.
Deformation and Fracture Behaviors in Microscale Laser Dynamic Flexible Forming: The Case of Fabricating Micro-Channel on Copper Foil
Authors: Chen Songling , Shen Zongbao 
Published: August 2021

Abstract
The case of fabricating micro-channel on copper foil using micro-scale laser dynamic flexible forming (μLDFF) is investigated in this work. To study the deformation and fracture behaviors, the copper foils are subjected to increasing laser power density until the occurrence of fracture. When laser power density ranges from 0.110 GW/cm2 to 0.441 GW/cm2, smooth micro-channel features are formed on copper foils, and the depth of the micro-channel gradually increases. Melting marks are observed at the micro-die entrance of the sample with 0.441 GW/cm2 laser power density. When laser power density is 0.544 GW/cm2, partial fractures are observed. The surface of fracture region is rougher than that of micro-cracks and no micro-cracks regions, which is caused by the higher strain in fracture region. And the fracture edge is irregular, which is caused by the soft effect of material. Complete fracture occurs when laser power density is 0.691 GW/cm2.
A Novel A-CNN Method for TBM Utilization Factor Estimation
Authors: Yu Honggan , Tao Jianfeng , Qin Chengjin , Sun Hao , Liu Chengliang 
Published: August 2021

Abstract
Utilization factor is one of the most important performance indicators of TBM, which affects the construction period and cost of the tunnel. However, there are few models to evaluate the utilization factor based on geological conditions and operational parameters. In this paper, a novel A-CNN neural network architecture for TBM utilization factor estimation is proposed. Firstly, the input dimension is expanded by a full-connected neural network. Secondly, a convolutional neural network is designed and added behind the expanded input to extract relevant features. Finally, a regressor is designed to build the mapping relationship between the extracted features and the utilization factor. The data collected from a Singapore tunnel project was utilized to verify the proposed method. The results show that the R2 of the proposed method on the test set is 0.521, which is 52.33%, 15.60%, 34.10%, and 9.40% higher than the KNN-based, SVR-based, RF-based, and DNN-based methods, respectively. Therefore, the proposed method can estimate the TBM utilization factor more accurately.
Investigating into Deep Neural Networks for Applicable Hard-hat Wearing Detection in Substations
Authors: Li Tong , Chen Qipeng , Gan Jinrui , Wu Peng 
Published: August 2021

Abstract
All staffs are strictly requested to wear hard-hats when working in substations. Various object detection algorithms, especially those based on deep learning, thus have been proposed for the corresponding purpose. A deep learning based-object detection algorithm commonly involves a fundamental neural network which dominates detection performances, so this paper investigates different types of networks’ applicability when utilizing them with a typical object detection algorithm for the monitoring of hard-hat wearing in substations. This is conducted from various perspectives concerned by real-world implementation that includes time consumption, computation speed, precision and more. As a consequence, this study provides a guideline to the selection of the most appropriate deep neural network architectures for the specific monitoring scenario.
Simulation Study on Bearing Capacity of Timber Beams with a Large Longitudinal Crack
Authors: Hu Xiaoyi 
Published: August 2021

Abstract
In order to investigate the influence of longitudinal cracks on the bearing capacity of wood beams, the simulation models of cantilever beam and simply supported beam with cracks were established based on the FEM and XFEM. Through the simulation, influence of the cracks on stress distribution and bearing capacity of the beams are discussed. Simulation results show that longitudinal crack has an effect of homogenizing the stress field in the wood beam, which is helpful to improve the overall displacement bearing capacity of the beam. Considering that survival with injuries is the normal state of wooden structures, the damage tolerance theory of wood structure can be developed. Therefore, this paper is a preliminary attempt in this field. However, the more complex microstructure of wood will make the damage process more complex. In the future, it is necessary to carry out targeted research, which can not only establish the damage tolerance theory for wood components, but also inspire more in-depth thinking and research in bionics.
Analysis and Application on Inverted Arch Support of Cross-cut Floor Heave
Authors: Wang Chao , Wu Yongping , Chen Shijiang , Zheng Wenxiang , Chen Xiaoyi , Nan Tongxin , Zhao Zihao , Duan Xiaobo , Li Qing , Zhang Bo 
Published: August 2021

Abstract
The cross-cut is an important gateway to connect the main roadway and the coal seam. The transportation, the pedestrian and the ventilation of mine could be seriously influenced by floor heave of cross-cut. Aiming at the severe floor heave of +1100 m track cross-cut in Liu Yuan Zi Coal Mine, the cross-cut surrounded with hard roof and soft floor was found. To solve this problem, the bolt-net-shotcrete and 36U-shape steel combined supporting (the original supporting scheme) and the bolt-net-shotcrete and 36U-shape steel round shed combined supporting (the new supporting scheme) respectively were applied to the cross-cut by numerical analysis. The simulation results indicate that the floor heaves is reduced by 57%, and the surrounding rock stress was changed from tension to compression at the bottom and the plastic range decreased and trended to homogenization. Field application results indicat that the cross-cut floor heave can be controlled effectively by bolt-net-shotcrete and 36U-shape steel round shed combined supporting. The conclusions provide a reliable technical scheme for hard roof and soft floor roadway.
Determination of Parameters of Johnson-Holmquist-II (JH-2) Constitutive Model for Red Sandstone
Authors: Huang Hongxin , Li Wenbin , Lu Zhenyu 
Published: August 2021

Abstract
In this paper, the parameters of Johnson-Holmquist II (JH-2) model of red sandstone are determined. Firstly, some mechanical properties of red sandstone specimens are tested, including quasi-static compression, SHPB dynamic compression test and Brazilian disk splitting test, and the basic mechanical parameters are obtained. Then, according to the theoretical model of JH-2 and other supplementary literature, some material parameters are preliminarily determined. Finally, by comparing the numerical simulation results with the experimental results, satisfactory parameters are obtained, which can effectively and accurately describe the mechanical response of red sandstone at various stages.
Research on Carbon Sequestration of Building
Authors: Shi Yu , Fu Yi , Chen Zongsheng , Shi Tiemao , Chu Yaqi 
Published: August 2021

Abstract
This paper briefly introduces the background, theory and recent achievements of building carbon sequestration, and introduces in details of the calculation method and the research characteristics, operability and shortcomings of this method. It points out that the model has conceptual visualization, rich connotation and its role in the design of low-carbon urban space, and its influence factors on the layout of low-carbon space are obtained from the determination of coupling building carbon sequestration according to the area of building units and patches. Finally, the current research trends and methods are reviewed and prospected, and it points out that its the whole life cycle and multi-scale and multi-objective influence mechanism can play a guiding role in the spatial layout of low-carbon cities.
CEPC’s Features and Expectation for the Future
Authors: Shao Yilang 
Published: August 2021

Abstract
This report will briefly introduce the CEPC and its booster and collider, which are the main components of CEPC. To get a more accurate physical model of the universe, CEPC has been enhanced in many design aspects and will outperform the original LHC in many aspects. CEPC will also help scientists discover many unanswered questions, such as dark matter, and it will focus on electroweak physics. CEPC has a strong potential in high-energy physics and the scientific community as a whole.
Research about a fast identification method for intermittent single Sub-synchronous Resonance phenomenon in large scale doubly-fed wind farm
Authors: Yuan Ye , Zhu Daming , Shi Qiaofan , Wang Kai , Feng Shitao 
Published: August 2021

Abstract
In this paper, a synchronous resonance (SSR) phenomenon caused by a large scale doubly-fed wind farm group after putting in series compensation device is analysed. By analysing the changing trends of the indicators during period of SSR phenomenon, 11 power quality indicators are chosen for calculated, then divided all the 11 indicators into 3 source data and 8 preliminary stage operational data by the observability of value. After divided the two kinds of data, a Pearson correlation coefficient between this two kind data was calculated to judge the relationship of them, and the characteristic indexes with stronger correlation during the resonance period were analysed. The maximum value of the above 8 characteristic indexes in the normal power generation process is used as the basic data for comparison, so as to realize the rapid and accurate judgement of the SSR moment. In the process of SSR judgement, the method has the characteristics of faster speed and simple determination, and it does not need to reform the existing power quality online monitoring device, and can realize real-time analysis and judgement of SSR phenomenon only by increasing extraction of the existing data function from the monitoring system. Finally, by testing data of two actual SSR events, the characteristic index determination method proposed in this paper is analysed and verified, and the feasibility of this method is proved.
Research on Nuclear Post-accident Liquid Level Detection Signal Deviation in Nuclear Power Plant Reactor Building
Authors: Fu Jiang , Jiang Jianjun , Yi Meng , Guo Chuan , Tang Lei , Han Yang 
Published: August 2021

Abstract
The level meter in the containment of nuclear power plant adopts the principle of static pressure measurement, and the pressure guiding medium is silicon oil, which is used to continuously measure the level of circulating coolant in the containment under the nuclear accident status and post-accident, aimed at the problem of serious deviations in measurement results caused by large changes in the density and volume of silicone oil affected by temperature changes, a detailed analysis of the root cause of the problem occurred, and the serious consequences that may arise will be described, proposed three solutions, analysed and demonstrated the feasibility of the three options and whether they meet the requirements of operating personnel to monitor the circulating cooling liquid level under the nuclear accident status and post-accident, after comprehensive analysis and comparison, the solution was finally determined. The results show that, according to the requirements of the measurement environment temperature range, selecting 85 degrees as the environment temperature for instrument calibration can minimize the measurement error, which is beneficial for the operators to monitor the circulating coolant level in the containment under the nuclear accident status and post-accident, meet the application requirements.
Prediction of photovoltaic power generation based on Bayesian neural network with grey correlation
Authors: Zhu Jiaxiong , Xiao Zhigang , Feng CHANG 
Published: August 2021

Abstract
Photovoltaic power generation depends on weather conditions, which has the characteristics of randomness, volatility and intermittence. In order to ensure the security and stability of the grid connected process and make full use of the advantages of photovoltaic power generation, this paper proposes Bayesian optimization algorithm based on grey correlation to predict the power of photovoltaic power generation. The gray correlation selects the similar correlation data from the original data set, and normalizes the data sample set to eliminate the influence of data size caused by different data dimensions. Bayesian optimization algorithm can effectively prevent over fitting by adding regularization term and super parameter α, β. Experiments show that the photovoltaic power prediction method based on Bayesian optimization algorithm under grey correlation has higher accuracy and robustness, and can provide more comprehensive information for power grid dispatching and control.
Research on Three Phase Signal Separation Method and Device for Live Detection of Circuit Breaker Contact Ablation Degree
Authors: Wang Chao , Wang Jianlong , Sun Dong , Dong Sichen , Yang Jie , Gao Jinyu , Wang Hongxing 
Published: August 2021

Abstract
A three-phase identification method and device for live detection of arc extinguishing performance of circuit breaker are proposed. In this paper, a sensor with three antennas is used to detect the electromagnetic wave radiated by the circuit breaker, and the three-phase identification is realized by controlling the receiving angle of the antenna and comparing the amplitude of the received electromagnetic wave. The method proposed in this paper has the technical advantages of simple implementation and low cost of detection device, and can realize the three-phase identification of live detection of circuit breaker arc extinguishing performance.
Comprehensive Evaluation of Weapon Equipment Systems Operational Effectiveness Based on State Space Concept
Authors: He Zhixing , Zhao Lijun , Ge Lin , Tang Qiaoqi 
Published: August 2021

Abstract
In recent years, there are many researches on combat test of weapon equipment systems. However, in the process of comprehensive effectiveness evaluation, there are some shortcomings in the construction of index system, such as index redundancy, experts subjective weighting, which lead to the lack of objectivity and scientificity. Focusing on the objective state of the evaluated object, this paper puts forward an idea of comprehensive evaluation in the efficiency state space (ESS), and uses intelligent data processing method based on principal component analysis to examine the correlation of the underlying indicators of the evaluation index system (EIS), and attempts to conduct a comprehensive evaluation on this basis. Finally, we give the comparison the corresponding new results with the original evaluation results in the references. The data show that comprehensive evaluation under ESS can reduce efficiency calculation dimension from10 to 3. The final efficiency ranking is slightly different from that in the reference, but is much more rational and convincing.
Design of Mine Temperature Measurement System
Authors: Chenyu Dai 
Published: August 2021

Abstract
This paper introduced a method of mine temperature measurement. The system used PT100 temperature sensor as sensing unit, constant current source composed of operational amplifier as excitation source, amplification circuit and A / D conversion circuit to process the output signal of Pt100 sensor, and STM32F103 microprocessor was used for data calculation and display, and the temperature data was converted into a 485 signal for long-distance transmission and temperature measurement system. The experimental results show that the system has high temperature measurement accuracy, wide measurement range, and low cost. Reliable measurement of temperature parameters in coal mines can be carried out, which is of great significance to ensure coal mine safety production.
Design and Implementation of a Wireless Iidentification Device
Authors: Lv Meimei , Ou GuoFeng , Ma Yan 
Published: August 2021

Abstract
This system takes AT89 series single-chip microcomputer as the core, which constitutes the two ends of the wireless identification device: transponder and reader. The whole system is mainly composed of the smallest single-chip microcomputer system, binary code preset circuit, carrier generation circuit, analog switch control circuit, high-frequency amplifying filter circuit, display circuit and other modules. The transponder part uses the AT89S51 single-chip microcomputer to control the serial output of the preset binary code, uses the active crystal oscillator to generate the carrier wave, and outputs the modulated signal through the analog switch. The reader part amplifies the modulated signal with high frequency, filters the signal, and controls the light-emitting diode to turn on and off to display the identification signal and the four-bit binary code after the acquisition and processing by the single-chip microcomputer. This design realizes the functions of identification, binary code preset and display, single power supply, transmission distance greater than 5cm, time less than 5s, accuracy rate greater than 80%, power less than 2W, transponder storage and other functions.