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Computational and Experimental Study on the Discharge Model of a 20 Amperes Emission Current Hollow Cathode 20安培发射电流空心阴极放电模型的计算与实验研究
Journal of Aerospace Technology and Management Pub Date : 2021-01-01 DOI: 10.1590/jatm.v13.1235
Mingming Sun, Chao Liu, Zengjie Gu
{"title":"Computational and Experimental Study on the Discharge Model of a 20 Amperes Emission Current Hollow Cathode","authors":"Mingming Sun, Chao Liu, Zengjie Gu","doi":"10.1590/jatm.v13.1235","DOIUrl":"https://doi.org/10.1590/jatm.v13.1235","url":null,"abstract":"The discharge characteristics of hollow cathode directly affect the performance of thruster. In order to obtain the plasma parameters of the 20 A emission current hollow cathode, COMSOL software is used to simulate the potential distribution, neutral fluid distribution and plasma parameters of the cathode, then the test is carried out to verify the simulations. The results show that the fluid velocity in the emitter region is about 20 ms–1 and is uniform in the radial direction. The electron density throughout the cathode discharge zone is almost uniform within the range of 1.09 × 1020 ~ 1.2 × 1020 m–3. The electron temperature increased from 2.8 to 4.9 eV throughout the cathode discharge zone. The electron collision frequency is in the order of 1023 Hz. The test results show that the electron temperature is increased from 2.4 to 5.2 eV from outlet of the emitter region to the plume region, and which presents an opposite trend to the electron density. There is a small error between the test results and the simulation results, and this error is mainly caused by the flow boundary setting.","PeriodicalId":14872,"journal":{"name":"Journal of Aerospace Technology and Management","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67185587","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Influences of Magnetic Flux Density on Discharge Characteristics of Low-Power Hall Thruster 磁通密度对小功率霍尔推力器放电特性的影响
Journal of Aerospace Technology and Management Pub Date : 2021-01-01 DOI: 10.1590/jatm.v13.1240
W. Guo, Jun Gao, Zuo Gu, Ning Guo
{"title":"Influences of Magnetic Flux Density on Discharge Characteristics of Low-Power Hall Thruster","authors":"W. Guo, Jun Gao, Zuo Gu, Ning Guo","doi":"10.1590/jatm.v13.1240","DOIUrl":"https://doi.org/10.1590/jatm.v13.1240","url":null,"abstract":"","PeriodicalId":14872,"journal":{"name":"Journal of Aerospace Technology and Management","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67185691","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Adaptive Filtering of UAV Movement Parameters Based on AOA-Measurements of the Sensor Network in the Presence of Abnormal Measurements 异常测量下基于传感器网络aoa测量的无人机运动参数自适应滤波
Journal of Aerospace Technology and Management Pub Date : 2021-01-01 DOI: 10.1590/jatm.v13.1242
S. Zhuk, I. Tovkach, O. Neuimin, V. Vasyliev
{"title":"Adaptive Filtering of UAV Movement Parameters Based on AOA-Measurements of the Sensor Network in the Presence of Abnormal Measurements","authors":"S. Zhuk, I. Tovkach, O. Neuimin, V. Vasyliev","doi":"10.1590/jatm.v13.1242","DOIUrl":"https://doi.org/10.1590/jatm.v13.1242","url":null,"abstract":"","PeriodicalId":14872,"journal":{"name":"Journal of Aerospace Technology and Management","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67185234","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Computational Aerodynamics Study of Competing Conceptual Designs for Advanced Tactical Fighter Aircraft 先进战术战斗机竞争性概念设计的计算空气动力学研究
Journal of Aerospace Technology and Management Pub Date : 2021-01-01 DOI: 10.1590/JATM.V13.1214
W. Siddiqui, Hassan Naseer, S. Zahid, A. Maqsood, S. Salamat, R. Riaz
{"title":"Computational Aerodynamics Study of Competing Conceptual Designs for Advanced Tactical Fighter Aircraft","authors":"W. Siddiqui, Hassan Naseer, S. Zahid, A. Maqsood, S. Salamat, R. Riaz","doi":"10.1590/JATM.V13.1214","DOIUrl":"https://doi.org/10.1590/JATM.V13.1214","url":null,"abstract":"Advanced tactical fighter (ATF) configurations are bound to perform high angle of attack (AoA) maneuvers. However, existing conceptual design tools available in aerospace industry are based on empirical or potential flows that cannot predict aerodynamic data in nonlinear regimes. High-fidelity computational fluid dynamics algorithms have to be incorporated during conceptual design phase for better assessment between competing configurations. In this research, steady state aerodynamic analysis is conducted to compare four conceptual designs of advanced tactical fighters through Reynolds-averaged Navier–Stokes (RANS) simulations. Prior to the study, two validation test cases were conducted based on ONERA M6 Wing and benchmark unmanned combat air vehicle (UCAV) design to assess the computational setup for the problem. Pressure based solver is used to model the flow field in subsonic, transonic and supersonic regimes at sea level for all four competing designs. The quantitative results include the aerodynamic forces and the longitudinal stability coefficient comparisons among the models and its components. The qualitative analyses include pressure distribution, eddy shedding and behavior of vortices at varying flow angle. Additionally, the empirical estimation for interpolation and post-stall extrapolation are carried out for further flight performance studies.","PeriodicalId":14872,"journal":{"name":"Journal of Aerospace Technology and Management","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67185266","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Experimental and Analytical Study of the Cold Flow Inside a Ramjet Test Engine 冲压发动机内部冷流的实验和分析研究
Journal of Aerospace Technology and Management Pub Date : 2020-11-21 DOI: 10.5028/jatm.cab.1154
L. C. Freitas, Olexiy Shynkarenko
{"title":"Experimental and Analytical Study of the Cold Flow Inside a Ramjet Test Engine","authors":"L. C. Freitas, Olexiy Shynkarenko","doi":"10.5028/jatm.cab.1154","DOIUrl":"https://doi.org/10.5028/jatm.cab.1154","url":null,"abstract":"The work is focused on the performance estimation and control of a cold flow inside a ramjet test engine, which initially operates without combustion, preparing the flow for the main propulsive phase. To achieve this objective, a “connected pipe” test bench was assembled. Flow management was performed using the control valve that allows regulating pressure and air mass flow rate in the engine according to its flight conditions through sensors installed at relevant positions. The proportional, integral and derivative (PID) parameters for the flow control algorithm were studied in order to guarantee the stable operation of the engine and correspondence of the flow parameters to predicted ones by the analytical modeling. Experimental results were validated by the numerical and analytical compressible flow models.","PeriodicalId":14872,"journal":{"name":"Journal of Aerospace Technology and Management","volume":"1 1","pages":"25-37"},"PeriodicalIF":0.0,"publicationDate":"2020-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47178258","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Handling Qualities Analysis of an Unmanned Aircraft Vehicle for Agricultural Spraying 农用喷雾无人飞行器操纵质量分析
Journal of Aerospace Technology and Management Pub Date : 2020-11-21 DOI: 10.5028/jatm.cab.1150
Artur Gustavo Slongo, D. Moraes, L. Q. Mantovani, M. Venturini
{"title":"Handling Qualities Analysis of an Unmanned Aircraft Vehicle for Agricultural Spraying","authors":"Artur Gustavo Slongo, D. Moraes, L. Q. Mantovani, M. Venturini","doi":"10.5028/jatm.cab.1150","DOIUrl":"https://doi.org/10.5028/jatm.cab.1150","url":null,"abstract":"The use of unmanned aircraft vehicles (UAVs) for the most diverse aeronautic missions is a reality. Then, with the rise of precision agriculture (PA), the viability of the incorporation of this technology in the countryside on both big and small proprieties is under study. This work aims to analyze the handling qualities of an UAV with a mission of pest control chemical spraying. With this objective, aircraft data was used to analyze the eigenvalues of the aircraft modes. Then, the impact of mass and inertia variation during its mission was studied. Also, the longitudinal and latero-directional dynamics were evaluated based on the Cooper–Harper scale. The results found indicate that all aircraft modes are stable for both full hopper and empty hopper conditions. Moreover, the determined handling quality grades of the UAV in the Cooper–Harper scale indicate the need for some correction applied by the pilot during flight.","PeriodicalId":14872,"journal":{"name":"Journal of Aerospace Technology and Management","volume":"1 1","pages":"38-51"},"PeriodicalIF":0.0,"publicationDate":"2020-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.5028/jatm.cab.1150","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47671446","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Preliminary Study of Launch and Orbit of a CubeSat Using a Modified VSB-30 Launcher Vehicle 基于改进VSB-30运载火箭的立方体卫星发射与轨道初步研究
Journal of Aerospace Technology and Management Pub Date : 2020-11-21 DOI: 10.5028/jatm.cab.1157
Artur Gustavo Slongo, A. L. Silva, D. Moraes, J. F. A. Martos, L. Q. Mantovani, M. Venturini, Róger Mateus Sehnem
{"title":"Preliminary Study of Launch and Orbit of a CubeSat Using a Modified VSB-30 Launcher Vehicle","authors":"Artur Gustavo Slongo, A. L. Silva, D. Moraes, J. F. A. Martos, L. Q. Mantovani, M. Venturini, Róger Mateus Sehnem","doi":"10.5028/jatm.cab.1157","DOIUrl":"https://doi.org/10.5028/jatm.cab.1157","url":null,"abstract":"During the last decade, the world faced the mass insertion of small satellites in the space technology scenario. Every year, the number of micro and nanosatellites launched increases and gets more attention from players in the space market. Despite the lack of a national launcher, the Brazilian Space Program is known for some successful development in the last century, including its space assets, such as a privileged launch site near the equator, a family of flight proven and reliable sounding rockets for suborbital flights and microgravity experiments and universities with established small satellites programs. Thereby, the present work proposes a modification of the Brazilian VSB-30 sounding rocket in order to allow the launch and insertion in low Earth orbit (LEO) of small satellites fulfilling the gap of a national launcher. It also presents a CubeSat orbital decay simulation and orbital insertion simulation with the modified rocket launched from the Alcântara Launch Center as a matter of verifying the potential of national missions using this modified launcher.","PeriodicalId":14872,"journal":{"name":"Journal of Aerospace Technology and Management","volume":"12 1","pages":"62-79"},"PeriodicalIF":0.0,"publicationDate":"2020-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46675486","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Preliminary Analysis of Solar Cell Interconnections Welding Parameters Using Design of Experiments for Future Optimization 基于实验设计的太阳能电池互连焊接参数初步分析
Journal of Aerospace Technology and Management Pub Date : 2020-11-21 DOI: 10.5028/jatm.cab.1151
Graziela Fernanda de Souza Maia, Marcelo L. O. Souza, Alírio Cavalcanti de Brito
{"title":"Preliminary Analysis of Solar Cell Interconnections Welding Parameters Using Design of Experiments for Future Optimization","authors":"Graziela Fernanda de Souza Maia, Marcelo L. O. Souza, Alírio Cavalcanti de Brito","doi":"10.5028/jatm.cab.1151","DOIUrl":"https://doi.org/10.5028/jatm.cab.1151","url":null,"abstract":"One of the processes that determine the reliability of solar panels used in space applications is the welding of interconnections between two adjacent solar cells. This process has various technologies, sequences and activities that have various characteristics, factors and parameters. Their combinations and values allow countless possibilities, making their adjustments time consuming, costly and exhausting. One way of abbreviating this, achieving competitiveness and meeting the needs of stakeholders is through the Analysis and Design of Experiments. This technique helps in optimizing the best adjustments to obtain the expected results. Thus, this paper presents a preliminary analysis of the parameters and their interactions of the welding process (by parallel-gap resistance welding) of interconnections between solar cells using design of experiments. In this welding process, the cell undergoes a certain level of degradation. For this reason, it is important to determine which process parameters are important and their proper levels, without big cell degradation. The result of this analysis can be used in the future to optimize the welding process meeting the design requirements for reliability and performance.","PeriodicalId":14872,"journal":{"name":"Journal of Aerospace Technology and Management","volume":"1 1","pages":"12-24"},"PeriodicalIF":0.0,"publicationDate":"2020-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49200091","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Control for the Space Tether System Motion 空间系绳系统运动控制
Journal of Aerospace Technology and Management Pub Date : 2020-11-21 DOI: 10.5028/jatm.cab.1147
M. Zanardi, P. R. Prado, L. Baroni
{"title":"Control for the Space Tether System Motion","authors":"M. Zanardi, P. R. Prado, L. Baroni","doi":"10.5028/jatm.cab.1147","DOIUrl":"https://doi.org/10.5028/jatm.cab.1147","url":null,"abstract":"This paper proposed a study of a spatial tether system (STS), composed by two satellite (a main satellite and a subsatellite), with the objective of developing a control system in which the motion of the subsatellite is limited in the orbital plane of the main satellite. The linear quadratic regulator (LQR) method is used to implement this control, which is an optimal control with state feedback to predict the linearization of the equations of motion to calculate the feedback gain, using the resolution of Riccati equation. The results show an effective control, with the motion of the subsatellite limited only to the stretch of the cable that links both satellites. However, it is necessary to introduce an auxiliary torque, since the linearized equation associated with the second variation of the angle out of the plan does not have a term independent of the state vector.","PeriodicalId":14872,"journal":{"name":"Journal of Aerospace Technology and Management","volume":"1 1","pages":"106-116"},"PeriodicalIF":0.0,"publicationDate":"2020-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43115618","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Experimental Study of The Insulating Effectiveness of Silicone Rubber Composites by Oxyacetylene Ablation Testing 硅橡胶复合材料氧乙炔烧蚀绝缘性能的实验研究
Journal of Aerospace Technology and Management Pub Date : 2020-11-21 DOI: 10.29327/2cab2019.224879
A. Andrianov, Jungpyo Lee, G. Possa, Hiterson de Oliveira Silva
{"title":"Experimental Study of The Insulating Effectiveness of Silicone Rubber Composites by Oxyacetylene Ablation Testing","authors":"A. Andrianov, Jungpyo Lee, G. Possa, Hiterson de Oliveira Silva","doi":"10.29327/2cab2019.224879","DOIUrl":"https://doi.org/10.29327/2cab2019.224879","url":null,"abstract":"The objective of this study was to characterize the thermal insulation efficiency of the silicone rubber reinforced composites by oxyacetylene torch. These composites reinforced by glass, carbon, ceramics and silica fibers were intended to be used as ablators in a low-thrust hybrid propulsion motor. The back-face temperature measurements were used as a criterion for insulation efficiency of the specimens, whose frontal face is subjected to the oxyacetylene flame for 40 s. The paper includes the results of the ablation rate measurements and the influence of orientation of glass and carbon fibers relatively to the flame direction on the back-face temperature of the specimens.","PeriodicalId":14872,"journal":{"name":"Journal of Aerospace Technology and Management","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49612130","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
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