bluuebunny/crossref_metadata_2025_split huggingface dataset:
Design of AGV human-machine interactive control system
Authors: Wang Zhe , Ai Chang Sheng , Wang Zhiyong , Zheng Lei 
Published: November 2020

Abstract
The outdoor intelligent transportation of a pharmaceutical factory requires the workshop to put forward task requirements according to the situation and provide multiple AGVs that can meet both man-machine control and networked scheduling. On the basis of existing AGV, an AGV control method based on human-computer interaction is proposed. First, design the overall architecture of the control system, use the touch screen to design and develop the AGV mobile client and task request client to form an industrial wireless network. The establishment of a network enables the AGV mobile client, task request client and vehicle management system to achieve cross-platform communication. Based on this, the client system sets and controls the AGV, which effectively solves the AGV’s man-machine control and networking scheduling problems. After functional testing and performance verification, the system works stably, with good flexibility and scalability.
Investigation of an Automobile magnetorheological damper with asymmetric mechanical characteristics
Authors: Song Xianyu , Dong Xiaomin , Yan Maosen , Li Xin 
Published: November 2020

Abstract
In order to reduce the cost of sensors in automotive magnetorheological suspension systems and improve system reliability, a structural design scheme of automotive magnetorheological dampers with asymmetric mechanical characteristics is proposed. In this structure, the rebound damping coefficient with or without the action of the magnetic field will be greater than the compression damping coefficient, which solves the influence of the traditional magnetorheological damper limited by its own adjustable range, and continuously outputs the passive damper under different working conditions. According to the structural design plan, the mechanical output characteristics of the system are analysed theoretically, and the prototype machine is processed and tested. The research results show that the designed magnetorheological damper has the working characteristics of continuously outputting asymmetric damping force, which verifies the effectiveness of the design ideas and methods.
Research And Analysis Of Three Degree Of Freedom Drivetrain Model For Wind Turbine
Authors: Du Jing , Wang Yan 
Published: November 2020

Abstract
According to the characteristics of the drivetrain shaft system of large-scale wind turbines, a three-degree-of-freedom wind turbine drivetrain dynamic model is established using Lagrangian equations and dynamic equations, and the drivetrain torsion mathematical model and multi-mass simplified model are extended to Three-degree-of-freedom multi-body dynamics mathematical model. Using this mathematical model can effectively carry out theoretical analysis on the vibration model of wind power generators, and provide a theoretical reference for the design and simulation of the drivetrain. Taking this three-degree-of-freedom mathematical model as a prototype, a three-degree-of-freedom(3-DOF) rigid-flexible coupling multi-body dynamics simulation model is established in Simpack. Perform frequency domain analysis in the dynamic equilibrium state of the drivetrain model to obtain frequency characteristics such as the natural frequency and energy distribution of the drivetrain. According to the frequency characteristics, the potential resonance frequency is identified, and the dynamic response characteristics of the transmission chain are analyzed to determine the dangerous resonance frequency of the dynamic model.
Simulation of Multi-robot Cooperative Scheduling System Based on ROS
Authors: He Yiming , Quan Yanming 
Published: November 2020

Abstract
Aiming at improving the management and scheduling efficiency of multi-robot in warehouse environment, a simulation method based on ROS system using 3D model and virtual activities to realize multi-robot collaborative scheduling was proposed and a multi-robot cooperating and scheduling system based on ROS was established, which includes building multi-robot simulation model, designing warehouse simulation environment, building multi-robot architecture and communication, task allocation and scheduling based on the minimum cost method. The system has the functions of map building, automatic navigation and obstacle avoidance, as well as the optimal scheduling of multi-objective points. The simulation results showed that the multi-robot collaborative scheduling system can reduce the workload of managers and improve the work efficiency of multi-robot.
Mechanical structure optimization of energy storage tank group in MEES system
Authors: Zheng Xiaoming , Liu Lihua , Ren Aiping , Yu Yang , Zhi Shenglong 
Published: November 2020

Abstract
The energy storage component of the MEES system is mechanical elastic energy storage tank group. Whether the mechanical structure design of energy storage tank is reasonable or not directly determines the performance of the whole system. In this paper, the structural design scheme of series linkage energy storage tank group is proposed, which can take into account the energy storage capacity and power demand. Firstly, the structural group of energy storage tank group is analyzed. Secondly, the operation mode of energy storage and power generation process of energy storage tank group is described in detail. Finally, the mathematical model of energy storage/generation operation is established, which provides theoretical guidance for the configuration of capacity and power of energy storage tank group.
An Empirical Study on Transmission Performance of IPv6 over WAN Latency
Authors: Meijia Liu , Qing Zhang 
Published: November 2020

Abstract
Compared to IPv4, IPv6 provides more internet protocol (IP) addresses and higher security and has easier routing capability; and these advantages lead to tendency of the IP protocol used by a network to be upgraded from IPv4 to IPv6. With the global transmission requirements of Big Data increasing rapidly, wide area network (WAN) will play a crucial role in data transfer, but majority of previous research studies are limited to local area network (LAN). Therfore, in this study, a WAN experiment is implemented to estimate the transmission control protocol (TCP) throughput of IPv4 and IPv6, which is used as an index to evaluate the efficiency of data transmission. Four latest operating systems were tested to assess performance, and a pair of operating systems was chosen to estimate the transmission efficiency of WAN by time delay. In this experiment, performance degradation in latency was quantified. The results will be a useful reference for followup research in the future.
Dual-Wavelength Self-Similar Pulse Fiber Laser Based On Topological Insulator
Authors: Liu Weici , Qi Lei 
Published: November 2020

Abstract
Multi wavelength ultrashort pulse is of great significance in the scientific field. The dual-wavelength self-similar (SS) pulse mode-locked fiber laser with topological insulator (TI) is studied in this paper. The study on evolution of dual-wavelength SS pulse is based on Ginzburg-Landau equation (GLE) by split-step Fourier transforms (SSFT). The results have a high theoretical significance and value in practice.
Test Research on Vibration State of Transformer in High Speed EMU
Authors: Deng Hai , Shi Huailong , Qi Yayun 
Published: November 2020

Abstract
Transformers are important under-vehicle equipment for high-speed EMUs and play an important role in ensuring the power transmission of EMUs. This article first introduces the vibration reduction theory of the equipment under the EMU, and then briefly introduces the structure of the transformer and the arrangement of the measuring points. Afterwards, The vibration data of the transformer in the middle and late stages of wear are analyzed. It can be obtained that: some line sections of the vehicle have hunting movement, and the lateral acceleration of the frame has harmonics, the main frequency is 7Hz, and the amplitude is 0.6g (3-9Hz band-pass filter). The bogie vibration will be transmitted to the carbody and the equipment under the carbody, which has a greater impact on the vibration of the auxiliary converter body, that is, the lateral main frequency of the auxiliary converter is about 7Hz.
The Evaluation and Research of step profiler about the measurement uncertainty
Authors: Hu Chang’an , Yang Li , Lv Fei , Li Jieji , Zhao Tao , Wu Yu , Xue Liang 
Published: November 2020

Abstract
The step profiler has the advantages of excellent repeatability and high resolution. However, as a new contact measurement equipment, it has specific measurement errors. This paper proposes a novel method to evaluate a step profiler’s accuracy by measuring the nano grating standard structure. These standard step height and pitch samples are used in the measurement process. The samples’ morphological characteristics were obtained by Fourier transformation, phase modulation, and phase splicing of the sampled data. The experimental results show that the step profiler’s vertical and horizontal relative measurement uncertainty is 4.0% and 1.2%.
Application of Machine Vision Technology in Intelligent Manufacturing
Authors: Peng Chen 
Published: November 2020

Abstract
Machine vision technology refers to the use of computers to mimic human visual functions. In the simulation process, a part of the human brain function is also added. Information can be read from the image of the objective and analyzed and processed accordingly, which is widely used in machinery manufacturing. However, in practical applications, problems have arisen in which the application in the precise measurement of workpiece is not reasonable and the application of detection needs to be improved. This article will study its application in mechanical manufacturing, and give some opinions and suggestions on how to promote the application of machine vision technology in the intelligentization of mechanical manufacturing.
Research on Air Flight Simulation Control Law of Large Aircraft
Authors: You Junbin 
Published: November 2020

Abstract
The air flight simulator, also known as the variable stability aircraft, can make the dynamic characteristics of the machine change or simulate the response characteristics of different objects in a large range through the variable stability telex system. This paper is devoted to the research of the air flight simulation control law of large aircraft, and designs the five degree of freedom variable stability control law: to control the elevator, rudder and aileron of the basic aircraft, and to design the three-degree-of-freedom variable stability control law. The control of the direct lift surface and the automatic throttle was added, and the five-degree-of-freedom variable stability control law was designed to simulate the trajectory characteristics and velocity characteristics. Finally, the variable stability control law is verified based on the target aircraft simulator.
Research on influence of Web spacing of bogie side member on welding deformation
Authors: Liyana  , Suliang  
Published: November 2020

Abstract
In the production process of bogie, welding is one of the important production technologies. To study and control the welding deformation of bogie frame side beam to make the deformation value within a reasonable range has very important practical significance for the production of bogie side beam. The research content of this paper will take high-speed EMU bogie frame side beam as the research object. Set different web spacing, compare the welding deformation value, explore the influence of structural stiffness on the welding deformation of side beam, and use MATLAB software to curve fitting the welding deformation value, the research shows the distribution law of transverse, longitudinal, vertical and comprehensive welding deformation, and fits the mathematical equation between the web spacing L and longitudinal deformation SX, vertical deformation SY, transverse deformation SZ In this paper.
Classification Research on DEM Resolution Determination Method Based On Slope Topographic Factor
Authors: Su Dandan 
Published: November 2020

Abstract
The determination of optimum DEM resolution is helpful to improve the accuracy of the research results. The classification of DEM resolution based on topographic factor is studied. This paper classifies and expounds DEM resolution determination method from four aspects of "micro topographic factor", "macro topographic factor", "micro and macro composite slope topographic factor" and "slope topographic factor extension factor", which provides reference for the quantitative determination of optimal DEM spatial resolution in the future.
Study on seal of the hydraulic lock with high pressure-resistance and leakage-free
Authors: Qiao Jing , Wang Li Peng , Li Guo Qiang , Hou Ding Qi , Wang Xiang Ling 
Published: November 2020

Abstract
In order to solve the sealing problem between the two cavities of the servo actuator in harsh environment, the high pressure resistant hydraulic lock with integrated cone soft seal technology is designed by using nonmetal rolling molding and self-balanced technology of a integrated valve core. Its life and sealing effect were tested; the results showed that this new type hydraulic lock has reliable open and shut characteristic as well as reliable sealing effect. It can ensure the servomechanism is fully close anywhere. The new type design has been applied to certain model of carrier rocket.
Experimental and simulation analysis of the influence of moisture on dielectric and breakdown properties of insulation pressboard used in power transformer
Authors: Wen Hao , Cheng Lin , Jiang Yi , Zhao Zhigang , Ye Wenyu , Hao Jian 
Published: November 2020

Abstract
The influence of water molecules on cellulose has attracted much attention. The influence of water molecules on the dielectric property and breakdown property of cellulose requires in-depth research. In this paper, firstly, the effect of water on the dielectric spectrum in the frequency domain dielectric spectrum and the breakdown voltage of cellulose were studied. Then the parameters such as free volume, hydrogen bond, energy level and state density of cellulose under different moisture content were analysed by molecular simulation. The changes of dielectric properties and breakdown properties of cellulose under different water content were studied and summarized. The variation mechanism of dielectric property and breakdown property of different moisture content was explained by molecular simulation.
Laser thermal lens measurement based on Newton ring interferometry
Authors: Qi Lei , Huang Jinzhi , Zhan Shuyun , Liu Weici , Zhu Hongjie , Liu Yuwang 
Published: November 2020

Abstract
Thermal lens technology has attracted much attention because of its high sensitivity, low detection limit and being suitable for the analyses of minute samples. Thermal lens technology has been widely used in many fields, such as chemistry, physics, environmental monitoring, electronics, material science and life science. In this paper, the laser thermal lens measurement is studied based on Newton’s ring interferometry, especially for the case of low-power laser. The application of this method in the measurement of small samples is also discussed. It is helpful to study the micro deformation of thin film and lens under low power laser at room temperature. The results are very important for the future research on the micro deformation of optical elements.
Thermal design and optimization of the stratospheric airship equipment module
Authors: Ke Mei , Xueyin Sun , Yuanzhu Pu , Cheng Li , Xinying Li , Jingjing Di , Zhegui Hou 
Published: November 2020

Abstract
Stratospheric airship is a special air vehicle which suspended in the stratosphere for a long period of time, it can be used for military and civil investigation,observation, communication and other purposes to the Earth’s surface. Because its altitude is about 20 km,its thermal environment is different from normal aircrafts or spacecrafts. On the one hand,the solar heat flux during daytime and the heat source of the equipment require a good heat dissipation design of the airship;on the other hand,the radiation and convective heat exchange at night require a good thermal insulation design of the airship. The key thermal design of the airship is how to balance daytime heat dissipation and nighttime insulation. In this paper,the convective and radiative heat transfer model of a certain stratospheric airship is established based on the CFD simulation method,and the daytime and nighttime operating modes are analyzed. Three thermal design optimization schemes including compartmentalization,cooling holes, and fans are proposed and evaluated by simulation methods. The calculation results show that the thermal design margin in different operating modes of the airship can be effectively improved by controlling the fan operating, which provides a reference for future development of corresponding models.
Optimization of Monolithic Gilbert Cell Mixer for Frequency Band 935-960 MHz
Authors: Shi Daoling , Wang Jing 
Published: November 2020

Abstract
This paper presents the electrical and layout design and optimization of Gilbert Cell mixer for frequency band of 935-960 MHz with LO-frequency of 915 MHz. The obtained maximum conversion gain is 22.2 dB, IM3 is -11.5 dBm, and ICP is -25.5 dBm, respectively. The design consist of generic Gilbert Cell mixer with differential RF input and IF amplifier with differential output. The technology of choice is VTT08 with bipolar junction transistors (BJT).
A comparative study of several boundary conditions on the body surface for the meshless electromagnetic scattering method
Authors: Gao Yukun , Chen Hongquan , Xu Shengguan , Zhang Jiale , Cao Cheng , Gao Huanqin 
Published: November 2020

Abstract
In order to accurately calculate the radar cross sections (RCS) of stealth aircrafts by using the meshless method, several typical body surface boundary conditions from finite-volume time-domain (FVTD) methods, which are suitable for the meshless method, have been compared. The bistatic RCS of a 2-D cylinder irradiated by transverse magnetic wave (TM wave) or transverse electric wave (TE wave) and a 3-D sphere irradiated by different polarization waves are calculated by the meshless method based on different boundary conditions. The numerical results show that the bistatic RCS calculated by the first boundary condition is closest to the series solution, which indicates that the scattering electric field on the surface of perfect conductors is only related to the incident electric field, and the scattering magnetic field is related to the scattering magnetic field near the body surface and the variation of the normal scattering electric field on the body surface. Finally, based on the selected optimal body surface boundary condition, the paper present the electromagnetic scattering field and the bistatic RCS for a 3-D stealth aircraft model, which shows the ability of the meshless method in dealing with 3-D practical problems to a certain extent.
Pitch Control of Wind Turbines Based on BP Neural Network PI
Authors: Du Jing , Wang Bo 
Published: November 2020

Abstract
For wind turbine operating above the rated wind speed, the output power of the generator is maintained near the rated power through pitch control. Due to the non-linear relationship between the pitch angle and the wind speed, the traditional PI controller is not ideal for control above the rated wind speed. Therefore, the currently used PI controller generally incorporates gain scheduling technology. A wind turbine pitch controller based on BP neural network PI is proposed in this paper, which optimizes PI parameters and has better control effects. First, the PI control strategy with gain scheduling is briefly introduced, and then the principle and implementation steps of BP neural network PI are given. Finally, compared the control effects of the two control strategies of PI with gain scheduling and BP neural network PI, a new co-simulation between Simpack and MATLAB/Simulink is built, and it is proved that the BP neural network PI can improve the effect of pitch control.
Design of auto disturbance rejection control system for pneumatic manipulator based on PLC Technology
Authors: Xu Hang , Tian Jiule 
Published: November 2020

Abstract
Aiming at the coupling effect between joints of two degree of freedom pneumatic mechanism in reciprocating motion, and the reciprocating motion problem caused by the imprecision and jitter of dynamic model in high-speed motion, an auto disturbance rejection control system of Pneumatic Manipulator Based on PLC technology is designed, and the parameter model of flexible joint manipulator system is established, and the cubic spline interpolation is optimized by PLC technology, The effective control mode of operation space is realized. The correctness and stability of the active disturbance rejection control system of Pneumatic Manipulator Based on PLC technology are verified by simulation experiment.
Evaluation Model of Automobile Users Satisfaction Based on AHP
Authors: Li Lanyou , Lu Jingui 
Published: November 2020

Abstract
Aiming at the uncertainty problem of obtaining automobile users satisfaction, evaluation models which combine the objective evaluation methods such as entropy weight method(EWM) and the subjective evaluation methods such as analytic hierarchy process(AHP) are given. With power, fuel consumption, space, control, comfort, appearance, automotive interior and cost performance as the performance evaluation indicators, the comprehensive coefficient weight for each indicator is determined with both AHP and other objective evaluation methods. Taking the SUV users satisfaction as an example, the satisfaction corresponding to each model is given. The results show that the satisfaction evaluation model based on the combination of AHP and objective evaluation method is more effective, which provides a reference evaluation model for the automobile enterprises that make decisions or seek for design innovation.
Feature Extraction Method of Radiation Source in Deep Learning Based on Square Integral Bispectrum
Authors: Yao Yanyan , Yu Lu , Chen Yiming 
Published: November 2020

Abstract
The feature extraction method of radiation source based on deep learning is a hotspot of specific emitter identification research. In the selection of the initial radiation source data for feature extraction, there are mainly two kinds of time series IQ data and frequency domain bispectral data. Both the IQ signal and the signal bispectrum contain the information that can characterize the fingerprint of the radiation source, and the deep learning methods mostly use different deep network structures to obtain better classification performance. This paper proposes a feature extraction method of radiation source based on bispectral data, and designs a deep network structure combining convolution and long short memory network, which has a better classification and recognition rate than a single convolution network and a single LSTM network.