bluuebunny/crossref_metadata_2025_split huggingface dataset:
Selecting Sensitive Features Using CDET for Bearing Fault Diagnosis
Authors: Se Haifeng , Zhou Lei , Xu Shiming , Kai Song 
Published: March 2022

Abstract
The rolling bearing fault detection technology solution can be used to maintain the machinery in advance and avoid downtime and safety accidents. However, the current studies primarily focus on utilizing complex algorithms to improve the accuracy of fault diagnosis, while neglecting the influence of extracted features on diagnosis results, resulting in redundancy and conflict among features. To address such an issue, a feature selection method based on compensation distance evaluation technique (CDET) is proposed to optimize the feature set extracted from acoustic emission (AE) signals. Firstly, multiple failure data of the bearing are modeled by the fault simulation experiment platform. Then, the proposed feature selection method is used to evaluate the sensitive features. Finally, hidden markov modelsupport vector machine (HMM-SVM) series model is used to predict works. The experimental results show that the proposed method selects 7 sensitive features from the feature set composed of 13 features and achieve a high accuracy (99.3%).
Vibration Analysis on the Rack of Electric Mini-tiller
Authors: Huang Guojun , Wang Hongrong , Liang Xincheng 
Published: March 2022

Abstract
The conventional internal combustion mini-tiller is a vitally agricultural tool with multiple functions, meanwhile the strong vibration may impose damaging effect on the user’s health. Hence, it is inevitable to replace the internal combustion by the electric motor. Although the performance of the electric mini-tiller has been enhanced greatly, the remaining vibration is still distinct and some diseases can be occurred incontrovertibly. The rack is one of the most significant components to connect the different parts for the electric mini-tiller, and the index may be improved through redesigning the structure of rack. In this study the rack has been analysed under different structure by Ansys workbench software, and simulations show that the vibration acceleration from the rack to the human body decreases greatly after the structure had been redesigned, which signifies the handling stability and riding comfort of mini-tiller can be promoted without the extra cost. Although the total vibration acceleration is reduced a lot, the vibration of cutting roller is more distinct than that of before. Therefore, the cutting configuration is needed to be optimized, and vibration transmitting path of cutting roller should be intervened as well in the future, enhancing the handling comfort and energy conservation of electric mini-tiller.
Rolling Bearing Fault Diagnosis Based on PCA-ResNet
Authors: Peng Xinjie , Wang Zhigang , Li Binbin , Qian Long , Jiao Bin 
Published: March 2022

Abstract
Aiming at the situation that there are many interference factors in the collected signals of rolling bearings working in harsh and complex environment. Propose A method of noise reduction based on principal component analysis (PCA) and fault diagnosis and classification based on residual neural network (ResNet). Experimental results show that this method can effectively complete the task of fault identification and classification, and is superior to LeNet-5, SVM, DNN and other common deep learning methods.
Research and Application of Display System of Component-Based Virtual Instrument for Land and Air Platforms
Authors: Cai Hao , Mao Zheng 
Published: March 2022

Abstract
With the diversified combat missions in the new era and the development of industrialization, the demand for military and civilian equipment continues to increase, and the development and upgrade standards of land-air dual-use platforms must also move toward standardization. As the core of information visualization and control standardization, the component-based virtual instrument display platform is an important part of the integrated information display system of the land-air platform. The component display platform takes the optimization of the research and development, design and maintenance of the land and air mobile platform as the starting point, and at the same time meets the needs of wartime and meets the development trend of future informatization. It adopts engineering design ideas, hierarchical software layout and componentized ideas of man-machines. The concepts of interaction design are based on componentization techniques, serial communication, data dictionaries, pattern transformations, etc. A comprehensive information display platform aims to increase software productivity, reduce development costs and degree of coupling, and meet human-computer interaction as well as user-friendliness requirements.
Study on the Division Method of Pipeline Robot Module
Authors: Zhu Haizhen , Yuan Yan , Lei Yongjun , Li Xiaoru 
Published: March 2022

Abstract
The working environment in the pipeline is getting worse, and there are more and more functional needs for the pipeline robots. The traditional pipeline robot structure is fixed and single, and the rapid design and assembly cannot be realized. There are still problems of repeated design between different types of robots.In view of these problems, a top-down modular design method—combining of axiom design and IDEF(ICAM DEFinition method) functional modeling is proposed to divide the pipeline robot system architecture.This method uses the mapping relationship between function and structure, and extracts the general modules and special modules in different types of pipeline robot systems, which realizes the modular design of the non-modular pipeline robot, so that the module structure at its component level can be universally exchanged to form resource sharing.
Modeling, simulation and experimental study of squeeze engine system
Authors: Dong Libao , Nie Wansheng , Li Geng 
Published: March 2022

Abstract
Taking the squeeze engine system as the research object, its dynamic characteristics are simulated and experimentally studied. Based on the idea of modular modeling, the dynamic model of engine components is established, and the system simulation model is constructed combined with the engine test system. The whole working condition dynamic simulation of extrusion engine is studied, and the actual ignition test is carried out to verify the whole working condition dynamic simulation of engine. The simulation and test results show that the dynamic simulation results of the engine under all working conditions are in good agreement with the test data, which verifies the accuracy of the simulation model.
Finite Time Convergent Cooperative Guidance Law for Multiple Flight Vehicles Considering Detection Efficiency
Authors: Deng Junzhi , Zhang Xi , Li Wei , Xia Qunli , Zhou Hang 
Published: March 2022

Abstract
Aiming at the problem of cooperative interception of maneuvering target, a cooperative guidance of multiple flight vehicles considering detection efficiency was designed based on the multi-agent finite time consensus theory. Considering the first-order dynamic of the flight vehicle, the guidance law was designed according to the relative motion equations and the model of cooperative detection, which can improve the estimation accuracy of the relative distance using the terminal LOS (Line-of-sight) angle and guarantee simultaneously strike the target in a finite time. Numerical simulation results show that in the case of different maneuvers of an evader, each flight vehicle can hit the target at the same time with a designed terminal LOS angle, and the detection accuracy of the relative distance was continuously improved during the terminal guidance.
PSO algorithm tuning PI_ PID controller parameters of quad-rotor UAV
Authors: Jing XueDong , Wang XuFei 
Published: March 2022

Abstract
Aiming at the difficulty in tuning the parameters of the quad-rotor UAV PID controller, the paper uses the PSO (Particle swarm optimization) algorithm to intelligently optimize the PID controller parameters of the quad-rotor UAV. The paper proposes to set the fitness function of the PID controller’s PSO algorithm with the controller’s adjustment time and overshoot. The PSO algorithm is a kind of bionic algorithm that birds are not. It can iterate through a huge number of particles and after a specified number of iterations, and finally find the method of the global optimal solution. In this paper, the attitude control of the pitch direction of the quad-rotor UAV is tested. In order to meet the control accuracy of the quad-rotor, the PI_PID controller is used as the attitude control of the pitch in the experimental part. The PSO algorithm can be used to quickly tune the parameters of the quad-rotor UAV PID controller. The PID controller tuned by the PSO algorithm has a shorter adjustment time and lower overshoot. It can make the attitude of the quad-rotor, have better control effect.
Research on prediction method of hydro-resistance of a seaplane based on BP network
Authors: Gao Xianjiao , Liu Tao , Zuo Zibin , Wu Bin 
Published: March 2022

Abstract
As one of the important hydrodynamic indexes of seaplane, resistance performance is related to the practicality and economy of a seaplane. Due to the strong nonlinearity between resistance and test variables, it is difficult to predict the response relationship between them by conventional data fitting method. This paper proposes to use BP neural network to construct the response relationship between model parameters and hydro-resistance, and so it can be used to the prediction of aircraft resistance under different conditions. The result shows that prediction error of this method is controlled within 4.4%, which meets the needs of engineering accuracy. This method can reduce the model test cost to some extent, and provide a new way for the prediction of hydro-resistance of seaplane.
Discussion on research status and key technologies of morphing aircraft
Authors: Guo Jiabao , Zhao Changjian , Song Zhiguo 
Published: March 2022

Abstract
Morphing aircraft is not only a hot point of the aeronautics and aerospace research, but also one of the most potential development directions in the future. However, the key scientific problems unsolved and bottlenecks are still limiting the development of morphing aircraft. This paper will start with the development and research status of morphing aircraft and focus on the key technologies to be solved in related fields. Finally, the future development of morphing aircraft technology is prospected.
Preparation of CuI films by continuous ion layer adsorption reaction (SILAR)
Authors: Zhao Jin , Chen Shuai , Liang Jiawen , Li Wei , Yan Zhanlin , Zhang Bin , Chen Naichao 
Published: March 2022

Abstract
Transparent conductive CuI films were prepared on ITO glass substrates using a low-temperature liquid-phase film preparation process, the continuous ion layer adsorption reaction (SILAR) method. The influence of process parameters on the film quality and film surface morphology was investigated, and the relationship between the growth rate of the films and the concentration of the reaction solution as well as the number of cycles was studied and analyzed. The experimental conditions for the preparation of CuI films with the highest transmittance were as follows: the concentration of the anion driving solution was 0.075 mol/L. The film thickness of the CuI films increased with the number of cycles, and films with a thickness of 1.73μm could be produced in 40 cycles. The films were tested by XRD and SEM and showed high purity, flat and dense surface.
Study on radar scattering characteristics of double S-shaped nozzles with different aspect ratio
Authors: Gao Xiang , Shi Yongqiang , Li Yiwen 
Published: March 2022

Abstract
To study the radar scattering characteristics of dual S-bend nozzles with different exit aspect ratios, the iterative physical optic method (IPO) method and equivalent edge currents method (EEC) method were combined to build a code that can be used to solve the electromagnetic scattering field of the nozzle. The reliability of the method has been verified by comparing the reference data. Then, the forward and back-forward IPO and ray tracing methods are used to reduce the calculation time. CFD method is used to calculate and analyse the influence of aspect ratio double S-shaped nozzle on aerodynamic performance. The thrust coefficient and the total pressure recovery coefficient of the double S-shaped nozzle will gradually decrease with the increase of the aspect ratio. the influence of the aspect ratio on the radar scattering characteristics of the dual S-shaped nozzle under the C-band was simulated by the IPO and the results were discussed.it is obtained that the RCS average value in the range of −40°~40° gradually decreases with the increase of the aspect ratio. Under the vertical polarization mode of the pitch detection plane, the average RCS of the AR6 model is 52.8% lower than that of the AR3 model, while it is reduced by 11.0% in the horizontal polarization mode, which has better stealth performance.
Satellite Orbit Design and Analysis Based on STK
Authors: Zhang Shilin 
Published: March 2022

Abstract
The design and analysis of satellite orbits has always been a hot topic in the aerospace field. Through the selection and optimization of orbital parameters, the satellite can meet the corresponding performance indicators and work requirements. However, there are often various constraints in actual scenes, so the orbital parameters cannot be set arbitrarily. Therefore, how to design the orbit under the constraints to make the satellite in optimum condition is very important. Based on STK, this paper proposes a satellite orbit design method, and realizes the optimization of the orbit through the simulated annealing algorithm. The simulation results show that this method can achieve satisfactory results and has certain practical value.
Analysis of Turbulent Boundary Layer Jet Flow Pattern of TPS Standard Nozzle
Authors: Mu Guozhen , Lyu Qiongying 
Published: March 2022

Abstract
The design of the standard nozzle affects the air mass flow calibration accuracy of TPS. The relationship between the outlet diameter and the jet flow pattern is studied by performing jet simulation simulation on the three outlet size standard nozzles under the same boundary conditions. Through the simulation results, it can be seen that the outlet diameter under a single variable determines the value and range of the jet Mach number, which will cause a huge change in the mixing zone of the turbulent boundary layer, which directly affects the turbulent kinetic energy and has a linear relationship with the mass flow rate.
Study on Variable Geometry Scheme of High Mach Axisymmetric Inlet
Authors: Li Jian , An Yang , Zhang Kunyuan 
Published: March 2022

Abstract
For scramjet, the inlet plays the role of capturing airflow, pressurizing and decelerating the airflow, and providing supersonic airflow to meet the combustion requirements for the downstream combustion chamber. In this paper, a prototype inlet is designed by using the method of spiral characteristic lines, and then the influence of moving center cone on the inlet performance is studied by numerical simulation. It can be found that the method of moving the center cone can obviously improve the performance of non-design point and self-starting performance of the inlet.
Research on switching method of low inertia microgrid parallel transformer
Authors: Ding Wenhui , Huang Qiyue 
Published: March 2022

Abstract
The vigorous development of clean energy technology has gradually led to the formation of a new power system. The new power system takes clean energy as the main supply, and has the advantages of clean, low-carbon, flexible and efficient. However, it has low inertia and is easily affected by energy fluctuation, resulting in protection misoperation. Microgrid has small volume and poor anti-interference ability. The magnetizing inrush current generated by parallel transformer during switching is very easy to lead to misoperation of transformer protection, which threatens the stability and safety of the whole power grid. Therefore, are switching method of parallel transformer is proposed. First, close all secondary circuit breakers, and then select the primary circuit breaker of one transformer for initial closing. After the closing is completed, conduct the closing operation again after the delay and phase angle determination. The two switching operations are completed, and the no-load closing operation is completed. Finally, the PSCAD simulation model is established to simulate the AC microgrid to verify the feasibility of this method.
Analysis of UAV patrol inspection technology suitable for distribution lines
Authors: Wan Dai , Zhao Miao , Zhou Hengyi , Qi Fei , Chen Xin , Liang Guanxuan 
Published: March 2022

Abstract
With the continuous improvement of UAV manufacturing level, it is more and more widely used in various fields. In recent years, unmanned aerial vehicle (UAV) inspection technology has been widely used in transmission lines above 110kV voltage level, and achieved good application results. However, because the operation of 10kV distribution line is much more complex than that of high-voltage transmission line, and the standardization of distribution equipment is low, the application effect of UAV inspection technology on distribution line is always unsatisfactory. Although some power enterprises have made continuous attempts, they have never formed an efficient and applicable UAV inspection technology system for distribution lines. In this paper, the operation characteristics of distribution lines and the existing working mode of manual inspection are deeply analyzed. At the same time, combined with the technologies of UAV carrying, attitude sensing and front-end identification, a practical implementation strategy of UAV patrol inspection of distribution line is proposed. It has guiding significance for expanding the application field of UAV and improving the efficiency of distribution line inspection.
Analysis of abnormal heating of 66kV dry-type air-core reactor grounding device
Authors: Yue Yun kai , Wu Tian bo 
Published: March 2022

Abstract
When dry-type air-core reactors are in operation, the surrounding grounding devices, fences and other closed structural parts are abnormally hot. Because there is no effective analysis and detection methods for concealed projects such as grounding devices, it brings great difficulties to on-site analysis of problems; this article is based on the site conditions Theoretical analysis and the use of ground penetrating radar detection technology to study a 66kV dry-type reactor grounding device abnormal heating problem, through the analysis of the detection results, it is found that the reason for the heating of the dry anti-grounding device is that the grounding device has a circulating current in the alternating field; The design and construction of grounding devices of dry-type air-core reactors in new projects will provide certain reference significance.
Modelling and design of parameters for fast simulation of electromagnetic transient in AC / DC hybrid microgrid
Authors: Zhao Guopeng , Zhang Youbo 
Published: March 2022

Abstract
AC/DC microgrids contain a large number of power electronic devices, and their frequent switching process will bring a huge amount of calculation to the electromagnetic transient simulation, thus reducing the simulation efficiency. The research on the external characteristics of the microgrid does not need to pay attention to the dynamic process inside the converter. Therefore, the equivalent simplification of mathematical model is used in this paper to reduce the amount of simulation calculation data of the electromagnetic transient model to achieve the purpose of improving simulation efficiency. This method is concise and efficient, which does not relay on the performance of computer or change the program algorithm of software. By simplifying the current loop with fast dynamic response in the control system, he time response capability of the model is improved, and the converter is replaced by a controlled voltage source, which reduces the dynamic process of frequent changes in the converter. Based on the mathematical equivalent simplified model of microgrid, an electromagnetic transient simulation model was established. Through simulation verification, the simulation efficiency can be significantly improved while the accuracy of the simulation results is guaranteed.
Fault Location Analysis in Active Distribution Network Based on Multi-population Genetic Algorithm
Authors: Ou Shifeng , Feng Bin , Qin Liwen , Yu Xiaoyong , Luo Yuteng 
Published: March 2022

Abstract
Because the fault location of active distribution network is a complex optimization model, the traditional genetic algorithm has the problems of premature and slow convergence when solving complex optimization problems. The switch function that can adapt to the switching of multiple distributed power sources in real time is proposed. Here, we proposed a novel method to locate the fault of distributed power distribution network based on a multi-group genetic algorithm. When locating the fault zone, The algorithm stipulates that the direction of the generator flowing to the electrical equipment is the forward direction of the transmission line. In this paper, multiple populations are used to search the solution range at the same time to ensure that the final solution is the global optimal solution, and the optimal individual retention algebra is used as the convergence condition to fully improve the solution speed, which is suitable for complex distribution networks with distributed power generation. The fault location model proposed in this paper is simulated by a numerical example, and the results show that the model can accurately find the fault point, and has validity and accuracy.
Research on intelligent pumped storage power station based on digital twins technology
Authors: Yan Jun , Zhou Jianzhong , Li Yuxin , Cao Xu , Sun Yong , Liu Baonan 
Published: March 2022

Abstract
In order to build a new power system and achieve the goal of carbon peak and carbon neutralization, intelligent power grid and large-scale intermittent new energy has developed rapidly, as a consequence, the situation of power grid is increasingly complicated. Pumped storage power station, as a key technology of energy storage, which can effectively coordinate the peak-valley contradiction of power grid, is gradually transforming to the direction of intelligence and digitalization. In this context, the development characteristics and difficulties of intelligent pumped storage power stations are explored. Based on BIM and GIS fusion technology, the hierarchical framework of digital twins of pumped storage power station is proposed, the construction of the digital twins of pumped storage power station is elaborated simultaneously. Two application cases of digital twins in pumped storage power stations are introduced combined with operation and maintenance, which provides technical support for intelligent construction of pumped storage power stations with high engineering practical significance.