bluuebunny/crossref_metadata_2025_split huggingface dataset:
Bearing Fault Diagnosis Based on CEEMDAN and Teager Energy Operator
Authors: Jing Xiao , Jianmin Mei , Zhiqiang Zhang , Chun Chang 
Published: November 2019

Abstract
Aiming at the problem that the early shock signal of rolling bearing fault is weak and difficult to extract, a combination of CEEMDAN and Teager energy operator is proposed. Firstly, CEEMDAN decomposition and noise reduction are performed on the original signal, and the most sensitive component is selected according to the correlation coefficient criterion. Then the Teager energy operator is calculated on the component to extract the fault feature. The analysis of the outer ring and inner ring peeling fault signal of the steady speed rolling bearing results shows that the impact component signal can be effectively enhanced, the enhanced fault impact characteristics can be accurately identified from the interference, and the weak bearing fault characteristics can be extracted, which can effectively monitor and troubleshoot the rolling bearing.
Analysis on Ecological Suitability of Land Use Planning in Industrial Park
Authors: Jun Shao , Jiali Yao , Xue Luo 
Published: November 2019

Abstract
In the process of planning and construction of industrial park, it is necessary to analyze the suitability of construction land, and use it as a basis to guide and demonstrate the rationality of planning spatial layout and land use, so as to provide scientific basis for planning decision-making. In this paper, the ecological suitability of land use planning in Tongshan County Economic Development Zone Master Plan is taken as the research object, the planning land use types are combed, the ecological sensitive factors are screened by the method of benefit analysis, the evaluation index system and method system are constructed, the ecological adaptability of industrial park land use is evaluated scientifically, the ecological adaptability of regional land use is determined, the construction land is reasonably planned and the planning is improved.
Research on Cutting Performance Optimization of Diamond Wire Saw
Authors: Feng Jiahao , Liang Huipin , Liu Jianwei , Mao Guanghua 
Published: November 2019

Abstract
Due to the wire sawing machine cutting technology has the advantages of more efficient, safer, higher yield and less pollution than the traditional quarrying method, it has been widely used in the mining of mine stone. In order to better analyze and study this technology, combined with the research progress of domestic and foreign scholars, the wire sawing machine cutting technology has been comprehensively analyzed and summarized. Firstly, the current advanced modular design of the wire sawing machine is introduced. Secondly, the structural innovation of multi-rope wire sawing machine is introduced. The influences of cutting speed and feed rate on the wear of diamond bead rope and the cutting efficiency of wire sawing machine are analyzed. And on the basis of this, the motor is under PID controll to find the optimal speed value, and finally explain its future development.
Research on pressure wave transmission coding and implementation of testing and adjusting system for layered water injection in oilfield
Authors: Cheng Zhihua , Kan Kun , Fan Zijun , Xu Yatian , Gu Chunyuan 
Published: November 2019

Abstract
Based on the communication of pressure wave in layered water injection pipeline, considering energy consumption and time consumption, the binary coding method and time coding method are analyzed and counted. A new improved time coding method which can reduce energy consumption by more than 50% is proposed. It improves the universality of the product and designs, and implemented in a distributed storage measurement and adjustment system.
TOPSIS method of roller coaster evaluation system based on Mahalanobis distance
Authors: Liu Dengfeng , Yu Haixin , Zhu Yaqi 
Published: November 2019

Abstract
Aiming at the problem of roller coaster evaluation, this paper puts forward a method of objective evaluation of roller coaster TOPSIS method based on Mahalanobis distance. The descriptive numerical information of the existing 5124 roller coasters in the world is crawled by using the network crawler technology. According to the TOPSIS algorithm, “The World’s Top Ten Roller Coaster” list is generated and the roller coaster ranking based on roller coaster speed, height, length and inversion number is obtained. By introducing two indexes of information coverage and information difference rate, the roller coaster rating system is compared and discussed horizontally and vertically.
Study on multi-axis simulated NC machining for thin-walled impeller
Authors: Guo Jingjie , Ma Shaojie , Zhang Xiangjin , Wang Kun , Du Jiaxi 
Published: November 2019

Abstract
Thin-walled impellers are widely used in aerospace and other high-end manufacturing industries However, the machining of thin-walled impeller is a difficult problem. In this paper, the simulated NC machining for thin-wall impeller with a wall thickness of 1.8 mm is presented. Firstly, the Three-dimensional model of thin-wall impeller with 18 blades is created in SolidWorks. The multi-axis NC machining processing for impeller includes is divided into four stages: roughing and grooving, finishing blade, finishing hub and finishing fillet. All the tool paths for the above-mentioned processing stages are planned by blade expert module in MasterCAM. The five-axis simulated machining for thin-walled impeller is carried out to detect abnormal phenomena such as tool collision by machine simulation module in MasterCAM. The study can simulate the real processing scene for multi-axis NC machining thin-walled impeller and improve the design of NC processing efficiency.
Dynamic simulation of the passive heave compensator for a strand jack
Authors: Zhan Y , Xu J A , Zheng S L 
Published: November 2019

Abstract
The passive heave compensator for a strand jack unit used in deep sea shipwreck salvage is studied. A dynamic model based on the Lagrange equations is developed, which considers the strand elasticity. Numerical simulations are performed for a range of compensator stiffness, which are determined by the gas volume. Numerical results show that increasing gas volume reduces the stiffness of the compensator, and the resulting displacements of compensator platform and sunken vessels decrease.
Low Stray Inductance Busbar Design and Optimization for SiC-Based Three-Level Device
Authors: gong Zhenzhou , xie Yiting , xu Yunfei , yuan Tingting , wang Laili 
Published: November 2019

Abstract
In this paper, the sensitivity of switching-off voltage spikes of SiC MOSFET and Si IGBT to stray inductance at the same voltage and current levels is compared and analyzed. The influence of the geometric structure of simple stacked busbar on its stray inductance is analyzed and the general guiding principle of busbar design is given. Aimed at the three-level circuit topology involved in this project, based on the analysis of its working principle and commutation circuit, the stray inductance network of stacked busbar is successfully extracted with the help of finite element simulation software ANSYS Q3D, and the idea of optimizing stray inductance of maximum commutation circuit is putted forward. A set of three-level AC-DC-AC power electronic device is designed, and a series of iterative optimization design and optimization results analysis of the busbar of the device are made.
Overlapping citrus segmentation and reconstruction based on Mask R-CNN model and concave region simplification and distance analysis
Authors: Longye Xiong , Zhuo Wang , Haishen Liao , Xilong Kang , Changhui Yang 
Published: November 2019

Abstract
Accurate segmentation and reconstruction of overlapping citrus target contours is the primary problem for picking robots. In view of the poor effect of existing research methods on the segmentation and reconstruction of overlapping citrus fruit target contours under complex background, a segmentation and reconstruction method based on region simplification and distance analysis is proposed. Firstly, the overlapping citrus region (Mask region) is obtained by using the previously trained Mask R-CNN model. Then, the convex hull curve of the region is obtained by the roll-wrapped convex shell algorithm, and the region enclosed by the convex curve and the Mask region are pixel-operated. The concave region is polygon-simplified; then the vertices of the polygon are extracted by the Shi-Tomasi corner detection algorithm, and the contour segmentation points are determined by analysing the distance from each vertex to the contour convex-hub curve. Finally, the segmentation contour is reconstructed by the least squares fitting method. The experimental results show that the average error of the proposed method for the reconstruction of overlapping citrus contours is 3.21%, the non-coincidence degree and time are 4.13% and 0.273s respectively, which superior to RANSAC algorithm and Hough transform algorithm. It can satisfy the recognition requirements of overlapping citrus in natural environment for citrus picking robots.
Transmission mechanism analysis of downhole drive reciprocating pump production system based on rack and pinion
Authors: Yan Wenhui , Zhou Jiangtao , Peng Yong , Xie Dong , Qu Yinan 
Published: November 2019

Abstract
At present, the rod production system is difficult to meet the requirements of directional wells and cluster wells with large slant, the rod and pipe of these pumping wells suffer from serious wear, high energy consumption and low system efficiency. Downhole drive reciprocating pump production system, cancelling the sucker rob for transferring forces and motion, utilizing downhole submersible motor drives the reciprocating pump through the downhole drive mechanism, which can avoid the wear of the rod and pipe and improve the system’s efficiency. The composition and working principle of downhole drive reciprocating pump production system are introduced. The scheme of downhole drive reciprocating pump production system based on rack and pinion drive is analyzed in detail. The dynamic model of rack and pinion is established. By the dynamic simulation of the downhole transmission mechanism, the vibration loads of the mechanism with start up different accelerations are analyzed, and it is concluded that it is better to start with the variable acceleration. The scheme can reduce the vibration load caused by the motion inertia to the mechanism and improve the service life of the whole oil production system.
Analysis of Factors Affecting the Working Performance of Brush slip ring system in Special Environment
Authors: Zhao Shuai , Ma Hongzhong , Chen Zhenfei , Jiang Mengyao , Li Xiujin , Liu Yidan , Chen Xuan , Zhang Xianghu 
Published: November 2019

Abstract
In the marine environment, the wear of carbon brushes in the brush slip ring system of doubly-fed generators is accelerated and the replacement frequency is relatively high. In this paper, an experimental platform is built to simulate the working environment of the carbon brush slip ring system in the marine environment, and the factors causing the accelerated wear of carbon brushes are explored, so as to make suggestions on operation and maintenance of the brush slip ring system. The composition of the oxidation film on the contact surface of the brush slip ring has been quantitatively analyzed to provide a basis for determining the content of the oxidation film.
Mechanical resonance suppression method of Naval Gun servo control system based on Notch Filter
Authors: Liang Simeng , Cai Jie , Cheng Shouhu 
Published: November 2019

Abstract
The naval gun servo system requires high dynamic tracking accuracy. In addition, the resonance point of the system changes at any time due to the influence of sea weather and wind waves. Therefore, the traditional off-line detection method of resonance point is not suitable for naval gun servo system. According to the characteristics of naval gun servo system, an on-line resonance suppression method based on notch filter is designed in this paper. The resonance frequency point is detected by fast Fourier transform, and then the notch filter is adjusted on-line parameters. The simulation results show that this method can suppress the resonance problem of naval gun servo system on line.
Design of ship exhaust gas desulfurization control system based on S7-1500 PLC
Authors: Yin Qi , Shreka Majed , Gao Ruifeng , Zhu Yunlong 
Published: November 2019

Abstract
In this paper, an exhaust gas desulfurization control system for the ship was designed based on the sodium-alkali desulfurization system. The control system composed of the process control and the monitoring system. Besides, Siemens S7-1500PLC was used to realize the process control. Moreover, the monitoring system consisted of the machine side touch screen and the remote host computer, which provided the real-time monitoring of the system. Furthermore, the main functions of the system were introduced and the design points were given. Eventually, the system had a good functional performance and achieved the expected control objectives after the control system debugging.
Dynamical Analysis and Simulation for a T chaotic System with Single Delay
Authors: Hai-yan Fu , Teng-fei Lei 
Published: November 2019

Abstract
In this paper, a single delay T chaotic system is constructed by adding a delay term according to the dynamic equation of T chaotic system. The bifurcation diagram, complexity, 0-1 test and phase diagram of the system are analyzed by Matlab, thus showing the sensitivity of the new chaotic system to system parameters. Finally, in order to further study the influence of the change of two parameters on the system, the bifurcation space diagram is used to analyze the system dynamics, thus further revealing the realizability and chaotic characteristics of the system.
AGC Performance Analysis of Thermal Power Unit Based on Characteristics of Steam Turbine Valve
Authors: Gao Song , Sun Mengmeng , Han Yingkun , Li Yuanyuan , Yu Qingbin , Yan Qing , Liu Enren 
Published: November 2019

Abstract
Maintaining the balance between real-time generation and load is one of the important tasks of power system. Automatic generation control (AGC) is an important part of power grid frequency control, so grid-connected thermal power units must have good AGC performance. Many factors may cause the AGC regulation performance of generating units to fail to meet the requirements, such as unreasonable system design, imperfect control strategy, poor equipment characteristics and so on. This paper introduces the performance index of thermal power units participating in AGC regulation and analyses the influence of flow characteristics of steam turbine valves on AGC performance. By optimizing the steam turbine valve management function, the performance can be effectively improved. The effectiveness of this method is verified by its implementation on a typical 300 MW thermal power unit.
Research on precision assembly error statistics and sensitivity based on vertical launcher model
Authors: Lei Xiaobo , He Chaoxun , Liu Junzhou , Fu Nianli 
Published: November 2019

Abstract
The installation accuracy of the shipborne vertical launcher and the different state parameters of the launcher’s guide rail will have different degrees of impact on the initial accuracy of the test-mounted missile. Therefore, it is of great practical significance to study the assembly error characteristics of the launcher. In this paper, the influence law of equipment installation accuracy and the influence of each component’s correlation error on assembly precision are analysed. The error law of the launching device is analysed based on mathematical statistics. At the same time, the sensitivity of the error is studied by multi-body theory method to improve the accuracy, efficiency and stability of the assembly. Through the established error sensitivity analysis model, the geometric error of the main components that have a great influence on the assembly accuracy during the assembly process of the launching device is effectively identified. The results show that the error data probability distribution of the vertical launcher conforms to the normal distribution, and the key factors of the assembly error are effectively detected, which provides a theoretical basis for the assembly precision control research.
A Design of Wide-range Frequency-tracking Ultrasonic Power Supply
Authors: Fu Yu , Fu Tie , Wang Aimin 
Published: November 2019

Abstract
Aiming at the problem that the frequency tracking range of commercial ultrasonic power supply on the market is narrow, which makes the load of ultrasonic power supply, a structure of transducer-horn-tool, difficult to match. This paper presents a kind of ultrasonic power supply based on TMS320F28335, which can track the frequency in a wide range(15-21kHz). The advantages, theory, software and hardware structure of the power supply are introduced, which can realize the functions of wide range frequency tracking, power regulation, human-computer interaction and so on. Experiments show that the power supply can well match the ultrasonic vibration load with a wide range of resonant frequencies, and has good human-computer interaction function.
Research and Application of Question Answering System Based on Subject Knowledge Base
Authors: Chen Yuyong 
Published: November 2019

Abstract
The intelligent subject knowledge base question-and-answer system has a positive effect on improving the self-learning ability of the students, and designs a subject knowledge base question-and-answer system based on man-machine interaction. The system design includes the design of the question and answer algorithm of the subject knowledge base and the software development and design of the system. The semantic ontology structure mapping method is adopted to control the semantic information in the question-and-answer process of the subject knowledge base, and the expert subject knowledge base is constructed. The semantic concept tree analysis is carried out in combination with the feature construction method of the subject word feature, the human-computer interaction design of a subject knowledge base question-and-answer system is carried out by adopting a networked information interaction mode, and a corpus of words, phrases and sentences of a subject knowledge base question-and-answer system is constructed, in that concept of the semantic subject word, the sentence division of the question and answer of the subject knowledge base is realized, and the subject word characteristic matching method is adopted to realize the algorithm design of the network subject knowledge base question and answer, and the intelligence of the question and answer of the subject knowledge base is improved. In the embedded industrial control host, the system development and human-computer interaction design of the subject knowledge base are carried out, and the system is mainly composed of an information processing module, a subject knowledge base information acquisition module, a DMA controller, an output module and the like. The test results show that the system can effectively realize the question-and-answer of the network subject knowledge base and improve the reliability and intelligence of the subject-and-answer system of the subject knowledge base.
Airborne gateway: key technology of earth observation system in the space-air-ground integration network
Authors: Hao Zeng , Linjun Qian 
Published: November 2019

Abstract
In traditional system of remote-sensing emergency services in space-air-ground integration network, the existing units of earth observation system operate independently from each other, the rate of data transmission and process can not meet the requirements, which makes the efficient actions taken after at least ten hours of the emergency. This has become a bottleneck for effectively responding to emergency events. The airborne gateway is the key technology to break through this bottleneck. The result of the rate test shows that our airborne gateway rate has reached 937M/s. Besides, it can also effectively detect moving target after preprocess. With the gateway, the three independent units are connected to a network, which works well and improves the efficiency of data processing and shorten the response time.
An approach for integrity assurance in Time-triggered Ethernet
Authors: Chen Pengyu , Li Zhaobin , Lian Weichen 
Published: November 2019

Abstract
In communication systems, integrity is the ability of a system to detect faults and achieve a fail-safe state during operation, and is one of the important attributes of credibility. Currently, there is no effective integrity assurance mechanism in Time-Triggered Ethernet (TTE). This paper combines the principles of cryptography, designs TTE switch with integrity guarantee mechanism, and builds a simulation platform to verify the design implementation. The simulation results show that the mechanism effectively implements the data integrity guarantee of TTE and improves the reliability of the TTE system.
PAPR Reduction of Multicarrier Faster-than-Nyquist Signaling by PTS Based on Tree
Authors: Cai Biao , Liu Aijun , Gao Chao , Liang Xiaohu 
Published: November 2019

Abstract
One of the common drawbacks of multicarrier communication systems is high peak-to-average power ratio (PAPR). Duo to the overlapped structure of multicarrier faster-than-Nyquist (MFTN) signaling, conventional PAPR reduction methods show poor performance. In this paper, we investigate the PAPR reduction of MFTN signaling. Specifically, as one of the most attractive methods, partial transmit sequence (PTS) method is exploited in MFTN signaling system. First, PTS method is combined with alternative signal (AS) to overcome the overlapped structure of MFTN signaling. Then, a tree based PTS method combined with AS is proposed, and all the candidate signal sequences can be generated by adding the difference signal sequence on the last candidate signal sequence, which can reduce the computational complexity significantly. Simulation results show that the proposed method does not have performance degradation on PAPR reduction.
Low cost intelligent household design based on Modbus/RTU protocol
Authors: Li Xinyang 
Published: November 2019

Abstract
Concerning about the fact that the quality of citizen’s daily life is improving in recent time, the construction of smart home has become as mainstream. We designed the intelligent household control system which achieved the muti-device communication through Modbus/RTU protocol, including the master device (AT89C51 singlechip), and the slave device. The master device took interrupt mode to send and receive data and realized the function that the slave device could receive, process, framing and send out the messages by adopting modular programming. The conflict of electrical level because of muti-device communication was solved effectively by designing the matched communication interface according to the Modbus protocol. This system has been tested to be useful and stable in basic control for intelligent household device. It can be easily achieved, duplicated and transplanted due to its minimal and low cost design.
Research Progress of Construction of Smart Campus
Authors: Yu Jiujiu , Zhang Jishan , Pan Liqiong , Yu Chunyan , Qi Hui 
Published: November 2019

Abstract
Smart campus is a new stage in the development of educational informatization. Focusing on present construction situation of smart campus in universities in China and abroad, the paper firstly reviews of typical construction modes, types of design architecture and major functional modules of smart campus in universities. Secondly, from the perspective of application, service and management for smart education, some key technologies of construction of smart campus in universities are analyzed and summarized. Finally, further work of promoting the construction standards and evaluation of smart campus, training and improving the big data literacy for teachers and students in campus, and exploring effectively on sharing and constructing mechanism on smart campus for local application-oriented universities is expected in this paper.