bluuebunny/crossref_metadata_2025_split huggingface dataset:
Modeling and simulation of equipment support scheme based on Agent
Authors: Guo Lu , Liu Xiaodong , Wei Dongtao , Zhu Pu 
Published: March 2022

Abstract
The core of missile equipment support task is to improve the availability of equipment. Support scheme simulation is an economical, feasible and efficient method to evaluate the effect of equipment support. According to the characteristics of air defense missile equipment, the modeling framework of missile equipment support scheme based on Agent is proposed, and the state change warning modeling and equipment support scheme modeling are carried out. The simulation process and concrete implementation method are explained. Finally, a certain type of missile equipment is taken as an example to verify the simulation results. The simulation results show that the established model can reflect the actual health status of the equipment, and the availability of the equipment can be improved according to the maintenance support strategy given by the simulation.
Effects of Forebody on Supersonic Parachute Aerodynamic Performance
Authors: Kou Zp , Zhan HR 
Published: March 2022

Abstract
As a typical aerodynamic deceleration device, supersonic parachute is widely used in aerospace return and recovery. The influence of the precursor on the aerodynamic performance of parachute is very important due to operating conditions under the wake of the precursor.In order to study the effects of supersonic forebody wake on parachute performance, numerical simulation of supersonic parachute is carried out, and the calculation results are in good agreement with the results of the wind tunnel test. The flow characteristics and flow field distribution of supersonic parachutes under free flow are analyzed. On this basis, the flow field characteristics and distribution laws of forebody and parachutes under different inflow Mach numbers and the aerodynamic characteristics of parachutes are studied. The results show that the compression wave and expansion wave generated by the forebody are reflected through the wall, and the reflected wave alternately appears in the downstream flow field. Affected by the forebody wake and reflected waves, the inflow velocity of the parachute has been asymmetrically distributed, and the velocity in the upper area has been seriously attenuated.
Functions and effective generation conditions of typical switched reluctance power generation systems
Authors: Tian Yuan , Zhan Ye , Hu Chunhong , Zhang Lijing 
Published: March 2022

Abstract
Switched Reluctance Motor (SRM) is a new type of high technology motor used in the most advanced warplanes. This paper combines the principle of SRM and takes the typical SRM power generation system of modern warplanes as an example to analyze the functions and power generation process of each part of the system, as well as its effective power generation conditions.
Numerical Research on the Simulation Nacelle of Ejector Engine
Authors: Du Xubo , Chen Pengfei , Yang Qingzhen , Chen Yuxi 
Published: March 2022

Abstract
The numerical simulation research of single-nozzle center ejector and double-ducted multi-nozzle ejection nacelle was carried out to study the dynamic simulation nacelle under variable working conditions required by advanced aero-engine test technology. The shock wave structure and blocking effect in the supersonic central ejector are analyzed in detail, and the internal flow field characteristics of the ejector under the condition of non-central axisymmetric supersonic ejection were examined. The aerodynamic characteristics of the single-ducted and double-ducted ejector nacelles are studied; and the flow field simulation with analyzation of the inner and outer ducts under the condition of variable duct ratio was carried out. The relevant conclusions obtained from the research can provide theoretical guidance and reference for the analysis of the multi-condition test run of the aero-engine test cell.
Analysis of Flow Pattern of Turbulent Boundary Layer Jet in Rectangular Nozzle
Authors: Mu Guozhen , Lyu Qiongying 
Published: March 2022

Abstract
The design of the rectangular nozzle affects the thrust and stealth performance of the propeller. The relationship between the outlet area and the jet flow pattern is studied through the simulation analysis of three different outlet area rectangular nozzles with an aspect ratio of 8. From the simulation results, it can be seen that the exit area under a single variable determines the value and range of the jet Mach number, which produces a huge change in the mixing zone of the turbulent boundary layer, but it has nothing to do with the development trend of the near and far field.
Analysis of Turbulent Boundary Layer Jet Flow Pattern of Laval Nozzle
Authors: Mu Guozhen , Lyu Qiongying 
Published: March 2022

Abstract
The rationality of the structure design of the Laval nozzle directly affects its work efficiency. The simulation software is used to simulate and analyze the structure and operating conditions of the Laval nozzle, and to find the relationship between the change of the turbulent boundary layer jet flow pattern. From the simulation results, it can be seen that the outlet diameter under a single variable cannot directly determine the value and range of the jet Mach number, but it produces a huge change in the mixing zone of the turbulent boundary layer, which directly affects the turbulent kinetic energy.
Research on Cascading Effect Analysis of Civil Aircraft WOW Signals Failures
Authors: Wang Yuqing , Shi Zhijian , Zheng Youshi 
Published: March 2022

Abstract
The WOW signals of landing gear system are important signals for most aircraft systems to judge the state of the aircraft in the air or on the ground. As common signals adopted by multiple systems, it has a wide range of failure effects and it is difficult to determine the failure effects consequences. In this paper, cascading effect analysis is used to evaluate the safety effects of WOW signals failures. The method of identifying the initiating condition of WOW signals is given, and an initiating condition is taken as an example to analyze its direct effects and indirect effects. On this basis, the aircraft-level comprehensive safety assessment is carried out to obtain the comprehensive classification of the initiating condition. Compare the comprehensive failure effect analysis results with the source analysis to evaluate whether they meet the safety requirements.
Coupled analysis of a high rate of fire artillery considering temperature rise
Authors: Jian Runji , Zhang Xin , Li Hao , Liu Xianfu 
Published: March 2022

Abstract
In order to study the influence of the temperature rise of the inner chamber on the dynamic characteristics of the projectile during the continuous firing process of the artillery, the thermal-mechanical coupling finite element model of the projectile and the barrel is established based on the damage effect of the projectile and the ductile damage fracture. The dynamic characteristics of the projectile in the process of squeezing into the projectile after continuous shooting are obtained by calculation, and the influence of different numbers of continuous fire on the movement characteristics and force of the projectile is discussed. The research results show that the temperature response of the wall of the barrel inside the barrel rises in a regular and periodic pulse-like shape during burst shooting; the temperature rise after 7 bursts and 20 bursts has an effect on the movement, force and structural strength of the projectile in the bore. The impact is not obvious.
An Analysis of Vision Based Soft Landing
Authors: Hou Beiran 
Published: March 2022

Abstract
The soft landing based on visual analysis is of great significance to planetary exploration, and there is also a good development prospect in the future. This paper introduces the process of soft landing technology and the working process of the landing camera. Taking Chang’e-3 as the main example, using methods such as descent image processing and SIFT feature matching, it explains the algorithm of Chang’e-3 to complete high-precision positioning and the process of autonomous hazard avoidance during landing. Also the accuracy of the positioning point is analyzed, which shows the effectiveness of the positioning method.
Research on calibration of accelerometer combined Norm-observation method based on global optimization
Authors: Zhang Xiaolong , Wang Shiming , Li Yibin 
Published: March 2022

Abstract
This paper provides a method for the overall calibration of the accelerometer combined error model coefficients. The calibration of the accelerometer error coefficients is achieved by using the Norm-observation method. It is important to achieve the calibration of the quadratic coefficient of the accelerometer. First, the Tylor series is used to expand the solution of the acceleration model, the nonlinear equations to be solved are obtained by using the least square method and Norm-observation method. Finally using 1stOpt platform of global optimization algorithm for the solution of equations for quadratic order coefficient, scale factor and zero bias. A 12-position method is designed to calibrate the accelerometer combination, the effectiveness of the method is verified by simulation.
Study on the influence of typical faults in AC area on DC voltage
Authors: Ren Hongtao , Lv Huiqing 
Published: March 2022

Abstract
By summarizing the architecture and operation control of the existing models, this paper establishes a typical DC power distribution structure model, and studies the wiring mode and working principle of the converter. For the DC distribution network under VSC pseudo bipolar operation mode, when considering the grounding mode, we focus on the neutral point of the connection transformer on the AC side, the filter neutral point on the AC side and the capacitor neutral point on the DC side. The causes and recovery process of DC positive and negative unbalanced voltage are analyzed. Begin in the asymmetric fault in the AC area, the paper proposes the cause and recovery process theory of unbalanced voltage of capacitors on DC side, the paper also analyzed the fault characteristics in AC area, and proposes the suitable grounding mode.
Electric vehicle charging station planning method based on charging service capacity quantification and distribution grid acceptance capacity constraints
Authors: Yang Yang , Wei Mengju , Liu Zhao , Wang Yongli , Qin Yumeng , Liu Zhen , Zhou Xiangyi 
Published: March 2022

Abstract
The planning of EV charging stations that integrates the quantification of charging service capacity and distribution grid acceptance capacity constraints is of great significance for the synergistic development of EVs and distribution grids. The charging service capacity quantification of the charging network is analyzed to derive the basis for judging whether the electric vehicle traffic on the path can be captured; with the objective of minimizing the total cost of construction and operation, a charging facility planning model is established, and the distribution grid acceptance capacity constraint is set, and the genetic algorithm is used to solve the problem, and the best planning scheme for electric vehicle charging stations is finally derived.
Research on Operation Management Technology of Cable Joints of Ring Network Cabinet Based on Temperature Sensors
Authors: Shang Shuning , Liang Guangsheng , Liu Changhua , Chen Jin , Shang Qiongling , Yu Jie , Chen Zhongbin 
Published: March 2022

Abstract
In this paper, aiming at the operation and maintenance of the internal cable joints of the ring main unit, the research on the operation and management technology of the ring main unit cable joints based on temperature sensors is carried out. Starting from the principle of temperature sensing technology for cable joints, an online temperature monitoring system for the cable joints of the ring network cabinet is developed during the operating cycle. Comprehensive consideration of factors such as seasons, ambient temperature and humidity, line load current, etc., to evaluate the operating status of the cable joint temperature data as the main basis. A simple and adjustable bracket suitable for the fixed installation of the non-contact temperature sensor of the ring main unit has been developed. A method of managing the cable joints of the ring main unit during the operating cycle is proposed to realize the effective evaluation of the cable joint status. It can greatly improve the accuracy of condition monitoring, and improve the efficiency and level of operation and maintenance.
Analysis of ultrasonic partial discharge characteristics of GIS’s reducing unit based on Finite Element Method
Authors: Gong Duohu , Chen Wentao , Zhan Zhongqiang , Dilyar·Dolkun  
Published: March 2022

Abstract
GIS’s reducing unit is a new and environment-friendly structural unit, which can greatly reduce the consumption of aluminum alloy material and insulating gas. The structural size of this unit is much smaller than the conventional one. In this paper, an acoustic-structure coupling interaction model of partial discharge in reducing unit of gas insulated switchgear (GIS) is presented. The interaction between the internal acoustic source of partial discharge and structure of GIS is simulated with the finite element analysis, and the acoustic pressure levels distribution of GIS is obtained. The results show that the sound pressure distribution of the reducing unit is basically the same as that of the conventional one, but the amplitude is larger. At the same time, the high-frequency part of the acoustic signal attenuates more quickly in the reducing unit. This paper provides a theoretical guidance basis for the ultrasonic partial discharge detection of the GIS reducing unit.
A novel distributed secondary voltage control method for AC microgrids based on voltage observer
Authors: Liu Jiayu , Tang Min , Zhou Jian , Zhang Qiqi , Zhang Luyuan 
Published: March 2022

Abstract
Since the islanded AC Microgrid is affected by the impedance of line, it is difficult to coordinate the voltage regulation and reactive load distribution. A distributed secondary voltage controller based on observer is proposed for isolated AC Microgrids, and it does not need more voltage communications. This method can guarantee the estimated average voltage equals to average of actual output voltages that can converge to the nominal values, and realize accurate proportional load sharing in a microgrid. Then, the convergence of the voltage observer is proved. Finally, the proposed control method is verified by time-domain simulation.
Research on the Characterization of Electric Vehicle Energy Storage Capacity and Coordination Mechanism with Distribution Network Based on Two-stage Method
Authors: Ma Dong , Song Yujiao , Zhou Zhaohui 
Published: March 2022

Abstract
This paper firstly analysed the characteristics of electric vehicle movement behaviour in multiple dimensions, extracts the correlation among electric vehicle energy storage characteristics and driving behaviour, state of charge (SOC), and charging behaviour, establishes a regional vehicle state transfer machine model, and dynamically adjusts the parking status of electric vehicles. Based on the measured data of electric vehicle charging, the probability distribution of charging behaviour parameters and their correlations were modelled in detail, the electric vehicle load was predicted, and the electric vehicle charging load model was established, and the available capacity assessment method was proposed.
Research of Thermal Behaviour of Li-ion Battery Module Based on Liquid Cooling
Authors: Guo Zhenqi , Zeng Fancong , Jiang Zhebin 
Published: March 2022

Abstract
An effective battery thermal management system (BTMS) is crucial to ensure the battery temperature in an appropriate range and prolong the battery life. In this paper, a liquid cooling thermal management method for a li-ion battery module which is consisting of 12 prismatic batteries is set up, three circuitous channels embedded with a cooling plate are studied. Meanwhile, the performance evaluations of the battery module by considering different cooling conditions and battery arrangement are investigated numerically. The effects of the flow area of cooling plate and mass flow rate of coolant on the peak temperature and temperature difference of the battery module during charge/discharge process are examined. The larger flow area is experienced with a lower maximum temperature. Increases of maximum temperature and temperature difference are shown at lower mass flow rate. This paper provides guidance for the design and optimization of the module and thermal management.
Operation optimization study of integrated energy system based on multi-energy complementary
Authors: Jia Shaokun , Xu Jian , Pan Yaqi , Tian Liyue , Gu Rui 
Published: March 2022

Abstract
Integrated energy systems integrate power and heat supply systems, and explore the energy saving potential of the systems by means of multi-energy coordination. For two typical multi-energy complementary integrated energy systems, the key factors affecting the system energy consumption are searched for, based on which a comprehensive evaluation model is established, and then a coordinated control method is proposed, which can be used to guide the operation optimization of the multi-energy complementary energy system.
Clinical study of injectable collagen scaffold with autologous fat cells for repair of severe vocal fold injury
Authors: Jin Xiaofeng , Liu Weiyuan , Wang Jian , Xiao Zhifeng , Niu Yanyan , Chen Bing , Zhao Yannan , Dai Jianwu 
Published: March 2022

Abstract
Cell retention and survival after transplantation remains a major problem for long-term efficiency in therapy of severe vocal fold injury with autologous cells. In this study, injectable collagen scaffold was used to deliver autologous fat cells (AFCs) for repairing of severe vocal fold injury. We found injectable collagen scaffold could enhance the retention and survival of green fluorescent protein (GFP) labeled fat cells in the transplantation sites in rats. Based on these data, a randomized controlled clinical trial was conducted to evaluate the safety and efficiency of transplantation of collagen scaffold with AFCs for severe vocal fold injury. Ten patients with vocal fold paralysis were randomly assigned to control (AFCs only) and intervention (AFCs + collagen) groups. AFCs with or without collagen scaffold were injected into vocal folds of patients under general anesthesia, respectively. The safety and efficacy were regularly assessed during 24 months post-surgery. No obvious complications occurred in all patients during the follow-up. The collagen scaffold maintained the stability of implants after injection and reconstructed the vocal fold structure. The improvement of voice quality of patients was observed through voice quality evaluation with the voice handicap index (VHI) questionnaire, as well as acoustic analysis of maximum phonation time, jitter, and shimmer. The VHI score of patients in AFCs + collagen group improved significantly than those in AFCs group at 6, 12 and 24 months post-surgery. It demonstrates the injectable collagen scaffold is safe and efficient for delivering AFCs for vocal fold injury.
Assessment of causes and control of fire disaster in Arepo neighbourhood, Ogun State, Nigeria
Authors: Oloke O.C. , Oluwatobi A.O. , Oni A. , Oke D. 
Published: March 2022

AbstractThis study examined the occurrence of fire disaster in Arepo community of Obafemi-Owode Local Government Area of Ogun State with emphasis on residential buildings. Questionnaires were administered to 210 adult residents of the neighbourhood while only 150 valid questionnaires are subsequently used for the analysis. Responses were measured on 5-Point Likert scale while the mean score, relative important index as well as frequency and percentages were also used for the analysis. Results were presented with Tables and charts. The study found that residential fire disaster ranked 2ndamong the six segments/object of fire disaster that had occurred in the community. It was further observed that faulty electrical appliances, carelessness and faulty cooking gadget ranked 1st, 2ndand 3rdamong the causes of residential fire outbreak in the neighbourhood and that majority of residential housing units are ill-equipped against fire outbreak within the residential neighbourhood in the community. The study therefore concluded by suggesting that government provide firefighting station in the community of Arepo and that the general public has to be enlightened on the importance of providing active firefighting equipment such as fire alarm system, smoke detector, flame detector, heat detector fire extinguisher etc. in their homes.
Production and purification of biogas from cassava peel using cow dung as inoculum
Authors: Fagbenle E.O. , Olukanni D.O. 
Published: March 2022

Abstract
The study examined biogas production from cassava peel and cow dung due to the large quantity of cassava peel disposed at dumpsites in local cassava processing sites. A 200L biodigester was used for the experiment. It contained 25 kg of cassava peel, 25 kg of cow dung and 100 kg of water in the ratio of 1:1:4, respectively. A cumulative volume of 937.3L of biogas was generated after the 30 days digestion period. The biogas generated was pass through a combined absorption and adsorption pre-treatment process to reduce the concentration of impurities in the biogas. The procedure had a 91.5% CO2removal efficiency and 88% H2S removal efficiency. The biogas, after purification can be used for cooking. Also, the digestate from the anaerobic digestion process is rich in NPK, which can be used as fertilizer.
Experimental investigation of contaminated clay slabs for X-ray shielding
Authors: Egbeyale Godwin Babatunde 
Published: March 2022

Abstract
The advent of radiation is a challenge to the human race therefore; a suitable material is a solution to effective radiation shielding. This research aims to investigate the effectiveness of clay slabs mixed with some heavy metals in radiation shielding. Thereafter, absorption coefficients (mass and linear) were calculated from both incident and transmitted intensity measured with a detector at different energies: 40 keV, 60 keV, 80 keV, 100 keV,120 keV, 150 KeV and 200 Kev. The following procedures were taken: the clay was mixed with heavy metals (Lead, Nickel Cadmium, Zinc and Copper) using the ion exchange capacity technique and then slabs were moulded using a wooden frame of dimensions 4 cm x 4 cm x 1 cm. A narrow collimated beam transmission geometry condition was used for the measurements. The measured values of these parameters were in good agreement with the literature. At selected energies, the values of linear and mass attenuation for lead were 2.29 cm-1 and 0.466 gcm-2, 1.58 cm-1 and 0.392 gcm-2, 1.23 cm- 1 and 0.281 gcm-2, 1.09 cm-1 and 0.216 gcm-2, 0.88 cm-1 and 0.180 gcm-2, 0.74 cm-1 and 0.168 gcm-2 and 0.57 cm-1 and 0.161 gcm-2, respectively. The results obtained were compared with concrete. The clay slabs mixed with heavy metal showed good shielding properties for moderate radiation energy. Hence, these slabs are feasible and cost effective compared with traditional concrete used for construction.