P. Rajarajeswari, P. Lalitha, Surya Kumari, A. S. Lakshmi, S. R. Mugunthan, Prathipati Ratna Kumar, Pranayanath Reddy Ananthula
Normally, flight delays and cancellations have significant impact on airlines operations and passenger’s satisfaction. Flight delays reduce the performance of airline operations and make significant effect on airports on time performance. Previously statistical models have been used for flight delays analysis. This study was applied in Indian aviation industry and it has given statistical analysis of domestic airlines. In this research paper, we have applied Machine Learning models with the help of computational intelligence techniques for predicting airport transport management system. We have also applied computational intelligence techniques such as Particle Swarm Optimization (PSO) and Ant Colonization Optimization (ACO) to optimize the prediction model for delay period time and calculating the most optimal dependability. We have made comprehensive analysis of Data Efficiency Model for different airlines with various approaches as well as comparative analysis of accuracy for predicting airport model by using various machine learning models. In this study we have presented invaluable insights for the analysis of flight delay models.
{"title":"Simulation based Predictive analysis of Indian Airport transportation system using Computational intelligence techniques","authors":"P. Rajarajeswari, P. Lalitha, Surya Kumari, A. S. Lakshmi, S. R. Mugunthan, Prathipati Ratna Kumar, Pranayanath Reddy Ananthula","doi":"10.1590/jatm.v15.1300","DOIUrl":"https://doi.org/10.1590/jatm.v15.1300","url":null,"abstract":"Normally, flight delays and cancellations have significant impact on airlines operations and passenger’s satisfaction. Flight delays reduce the performance of airline operations and make significant effect on airports on time performance. Previously statistical models have been used for flight delays analysis. This study was applied in Indian aviation industry and it has given statistical analysis of domestic airlines. In this research paper, we have applied Machine Learning models with the help of computational intelligence techniques for predicting airport transport management system. We have also applied computational intelligence techniques such as Particle Swarm Optimization (PSO) and Ant Colonization Optimization (ACO) to optimize the prediction model for delay period time and calculating the most optimal dependability. We have made comprehensive analysis of Data Efficiency Model for different airlines with various approaches as well as comparative analysis of accuracy for predicting airport model by using various machine learning models. In this study we have presented invaluable insights for the analysis of flight delay models.","PeriodicalId":14872,"journal":{"name":"Journal of Aerospace Technology and Management","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67186204","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}
S. Sonkar, Prashant Kumar, Yuvaraj Tanjore Puli, R. George, Deepu Philip, A. K. Ghosh
Fixed-wing unmanned aerial vehicles (UAVs) offer the best aerodynamic efficiency required for long-distance or high-endurance applications, albeit their runway requirement for take-off and landing in comparison with quadcopters, helicopters, and flapping-wing UAVs that can perform vertical take-off and landing (VTOL). Integrating a multirotor system with a fixed-wing UAV imparts VTOL capabilities without significantly compromising fixed-wing aerodynamic efficiency, endurance, payload capacity or range. Documented system design approaches to address various challenges of such fusion processes are sparse. This research proposes a holistic approach for designing, prototyping, and testing an electric-powered fixed-wing hybrid VTOL UAV. The proposed system design approach augments the standard aircraft design process with additional steps to integrate VTOL capabilities. Separate fixed-wing and multirotor designs were derived from the frozen mission requirements, which were then fused. The process used simulation for modeling and evaluating alternatives for the hybrid UAV created using standard aircraft design equations. We prototyped and instrumented the final design to validate operational capabilities through test flights. Multiple flight trials identified the ideal combination of Lithium-Polymer (Li-Po) batteries for VTOL (8000mAh) and fixed-wing (14000mAh) modes to meet the endurance and range requirements. The redundant power supplies also increased the survivability chances of the hybrid UAV during failures.
{"title":"Design & Implementation of an Electric Fixed-wing Hybrid VTOL UAV for Asset Monitoring","authors":"S. Sonkar, Prashant Kumar, Yuvaraj Tanjore Puli, R. George, Deepu Philip, A. K. Ghosh","doi":"10.1590/jatm.v15.1297","DOIUrl":"https://doi.org/10.1590/jatm.v15.1297","url":null,"abstract":"Fixed-wing unmanned aerial vehicles (UAVs) offer the best aerodynamic efficiency required for long-distance or high-endurance applications, albeit their runway requirement for take-off and landing in comparison with quadcopters, helicopters, and flapping-wing UAVs that can perform vertical take-off and landing (VTOL). Integrating a multirotor system with a fixed-wing UAV imparts VTOL capabilities without significantly compromising fixed-wing aerodynamic efficiency, endurance, payload capacity or range. Documented system design approaches to address various challenges of such fusion processes are sparse. This research proposes a holistic approach for designing, prototyping, and testing an electric-powered fixed-wing hybrid VTOL UAV. The proposed system design approach augments the standard aircraft design process with additional steps to integrate VTOL capabilities. Separate fixed-wing and multirotor designs were derived from the frozen mission requirements, which were then fused. The process used simulation for modeling and evaluating alternatives for the hybrid UAV created using standard aircraft design equations. We prototyped and instrumented the final design to validate operational capabilities through test flights. Multiple flight trials identified the ideal combination of Lithium-Polymer (Li-Po) batteries for VTOL (8000mAh) and fixed-wing (14000mAh) modes to meet the endurance and range requirements. The redundant power supplies also increased the survivability chances of the hybrid UAV during failures.","PeriodicalId":14872,"journal":{"name":"Journal of Aerospace Technology and Management","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67186011","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}
Airports are seen as a crucial component of infrastructure in the construction of modern cities in the Middle East, where aviation is recognized as a top priority in their development strategy. While the airline industry in the Middle has been investigated, there are no studies that explored the region’s successful global aviation hubs from a national competitive advantage perspective. Therefore, this paper examines the macro environmental elements affecting a nation’s competitiveness in the aviation industry using a mixed-methods approach, including Porter’s notion of national competitive advantage and expert views. The analysis shows that while macro environmental factors such as geographical advantage, physical and intellectual infrastructure, and business attractiveness are important for a successful aviation development, they are not necessarily required to guarantee a hub status unless the governments are devoted to developing the sector.
{"title":"National Competitive Advantage Perspective of Global Aviation Hubs: The Middle East Big Three","authors":"Stephen Moreland, Mahmoud Alajaty, E. Njoya","doi":"10.1590/jatm.v15.1298","DOIUrl":"https://doi.org/10.1590/jatm.v15.1298","url":null,"abstract":"Airports are seen as a crucial component of infrastructure in the construction of modern cities in the Middle East, where aviation is recognized as a top priority in their development strategy. While the airline industry in the Middle has been investigated, there are no studies that explored the region’s successful global aviation hubs from a national competitive advantage perspective. Therefore, this paper examines the macro environmental elements affecting a nation’s competitiveness in the aviation industry using a mixed-methods approach, including Porter’s notion of national competitive advantage and expert views. The analysis shows that while macro environmental factors such as geographical advantage, physical and intellectual infrastructure, and business attractiveness are important for a successful aviation development, they are not necessarily required to guarantee a hub status unless the governments are devoted to developing the sector.","PeriodicalId":14872,"journal":{"name":"Journal of Aerospace Technology and Management","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67186581","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}
Diego Anestor Coutinho, P. Paulino, Arielli Ajudarte da Conceição, Sthefany Farias Vilela, G. Aquino, Antonio Alves Ferreira Junior, Evandro César Vilas Boas
ABSTRACT This work presents the design and prototyping of two 1U standard CubeSats for the First Brazilian MCTI Satellite Olympiad, launching one in a stratospheric helium-filled balloon. The nanosatellites were designed for two missions: Internet of Things connectivity in remote areas based on CubeSat (IoSat) and low-orbit harmful gamma radiation mapping (LOHGRM). The IoSat mission aimed to provide server connectivity for a remote sensor network. The LOHGRM CubeSat was designed for sensing and mapping gamma radiation power levels in the satellite’s orbit to construct a heat map to study the gamma radiation effect on the equipment. The prototype’s performance was evaluated based on physical, mechanical, magnetic, thermal, and transmission characterization, with satisfactory results under test conditions. The LOHGRM mission test was carried out on the ground as proof of concept without flying while a stratospheric balloon launched the IoSat prototype. Due to restrictions imposed by the competition, the IoSat nanosatellite only captured and registered altitude, pressure, and temperature data without testing the communication payload. Instead, this data was sent to the ground station through the competition communication system and stored in a memory card to assess its operation during the flying. The satellite’s maximum altitude was 22.6 km, operating under –23.5 °C.
{"title":"Design, Prototyping and Stratospheric Launch of CubeSats for University Competition","authors":"Diego Anestor Coutinho, P. Paulino, Arielli Ajudarte da Conceição, Sthefany Farias Vilela, G. Aquino, Antonio Alves Ferreira Junior, Evandro César Vilas Boas","doi":"10.1590/jatm.v15.1295","DOIUrl":"https://doi.org/10.1590/jatm.v15.1295","url":null,"abstract":"ABSTRACT This work presents the design and prototyping of two 1U standard CubeSats for the First Brazilian MCTI Satellite Olympiad, launching one in a stratospheric helium-filled balloon. The nanosatellites were designed for two missions: Internet of Things connectivity in remote areas based on CubeSat (IoSat) and low-orbit harmful gamma radiation mapping (LOHGRM). The IoSat mission aimed to provide server connectivity for a remote sensor network. The LOHGRM CubeSat was designed for sensing and mapping gamma radiation power levels in the satellite’s orbit to construct a heat map to study the gamma radiation effect on the equipment. The prototype’s performance was evaluated based on physical, mechanical, magnetic, thermal, and transmission characterization, with satisfactory results under test conditions. The LOHGRM mission test was carried out on the ground as proof of concept without flying while a stratospheric balloon launched the IoSat prototype. Due to restrictions imposed by the competition, the IoSat nanosatellite only captured and registered altitude, pressure, and temperature data without testing the communication payload. Instead, this data was sent to the ground station through the competition communication system and stored in a memory card to assess its operation during the flying. The satellite’s maximum altitude was 22.6 km, operating under –23.5 °C.","PeriodicalId":14872,"journal":{"name":"Journal of Aerospace Technology and Management","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67185938","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}
This editorial provides a comprehensive overview of the latest advances in solar cell material research and the potential applications of these materials in space. The overview highlights the need for a multidisciplinary approach that considers materials, manufacturing and integration to further promote the use of solar energy in space and support the growth of programs like mega-constellations of satellites.
{"title":"Recent Advances in Solar Cells for Aerospace Applications: Materials and Technologies","authors":"R. Pessoa, P. Paulino","doi":"10.1590/jatm.v15.1296","DOIUrl":"https://doi.org/10.1590/jatm.v15.1296","url":null,"abstract":"This editorial provides a comprehensive overview of the latest advances in solar cell material research and the potential applications of these materials in space. The overview highlights the need for a multidisciplinary approach that considers materials, manufacturing and integration to further promote the use of solar energy in space and support the growth of programs like mega-constellations of satellites.","PeriodicalId":14872,"journal":{"name":"Journal of Aerospace Technology and Management","volume":"296 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67185954","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}
Cusped-field Hall thrusters (CFHT) have significant potential for use in many space missions due to their simplicity, long life and high efficiency. CFHT-27, designed and developed at the Bogazici University Space Technologies Laboratory (BUSTLab), is a prototype CFHT with a 27-mm diameter discharge channel. CFHT-27 utilizes samarium-cobalt (SmCo) permanent magnets. The thrust and efficiency of a cusped-field thruster is closely related to its size and design parameters. In this study, in order to understand the relationships between the design parameters and the thruster performance, the performance tests of the CFHT-27 are carried out for a given magnetic field topology. The thruster was operated at discharge voltages ranging from 250 to 500V with argon propellant with up to 3,000 s of specific impulse. The measurements show that CFHT-27 can achieve thrust values from 1 to 46 mN. Thus, this thruster can be used for a wide range of thrust values allowing throttle capabilities for different missions.
{"title":"Experimental Investigation of the CFHT-27 Cusped-Field Hall Thruster Performance","authors":"Emin Saridede, Selcen Yediyildiz, M. Çelik","doi":"10.1590/jatm.v15.1294","DOIUrl":"https://doi.org/10.1590/jatm.v15.1294","url":null,"abstract":"Cusped-field Hall thrusters (CFHT) have significant potential for use in many space missions due to their simplicity, long life and high efficiency. CFHT-27, designed and developed at the Bogazici University Space Technologies Laboratory (BUSTLab), is a prototype CFHT with a 27-mm diameter discharge channel. CFHT-27 utilizes samarium-cobalt (SmCo) permanent magnets. The thrust and efficiency of a cusped-field thruster is closely related to its size and design parameters. In this study, in order to understand the relationships between the design parameters and the thruster performance, the performance tests of the CFHT-27 are carried out for a given magnetic field topology. The thruster was operated at discharge voltages ranging from 250 to 500V with argon propellant with up to 3,000 s of specific impulse. The measurements show that CFHT-27 can achieve thrust values from 1 to 46 mN. Thus, this thruster can be used for a wide range of thrust values allowing throttle capabilities for different missions.","PeriodicalId":14872,"journal":{"name":"Journal of Aerospace Technology and Management","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67185900","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}
In order to intercept hypersonic vehicles in near-space, a head-pursuit cooperative guidance law is proposed in this paper. Firstly, interceptors are regarded as multi-agents, and the communication relationship between them is represented by graph theory. Based on the time consistency theory of multi-agent system and sliding mode theory, a guidance law is designed along line-of-sight (LOS) to ensure the time cooperation of interceptors. Secondly, considering the requirement of the head-pursuit theory to the lead angle, a finite-time guidance law is designed perpendicular to LOS to ensure that each interceptor can complete head-pursuit interception. For the purpose of improving the intercept precision, extended state observers are used to estimate the system disturbances. The correctness of the guidance law is analyzed by Lyapunov stability theory. Finally, numerical simulations are presented and the results further verify the correctness of the guidance law.
{"title":"Study of Head-Pursuit Cooperative Guidance Law for Near-space Hypersonic Interceptor","authors":"Chenqi Zhu, Xiang Liu","doi":"10.1590/jatm.v15.1293","DOIUrl":"https://doi.org/10.1590/jatm.v15.1293","url":null,"abstract":"In order to intercept hypersonic vehicles in near-space, a head-pursuit cooperative guidance law is proposed in this paper. Firstly, interceptors are regarded as multi-agents, and the communication relationship between them is represented by graph theory. Based on the time consistency theory of multi-agent system and sliding mode theory, a guidance law is designed along line-of-sight (LOS) to ensure the time cooperation of interceptors. Secondly, considering the requirement of the head-pursuit theory to the lead angle, a finite-time guidance law is designed perpendicular to LOS to ensure that each interceptor can complete head-pursuit interception. For the purpose of improving the intercept precision, extended state observers are used to estimate the system disturbances. The correctness of the guidance law is analyzed by Lyapunov stability theory. Finally, numerical simulations are presented and the results further verify the correctness of the guidance law.","PeriodicalId":14872,"journal":{"name":"Journal of Aerospace Technology and Management","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67185887","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}
From the perspective of the evolution of modern mass-production industrial sectors, the establishment of an industry can occur in a typical sequence of four conceptual phases: the introduction phase, in which a new technological concept is introduced; the growth phase, in which application of this concept in the form of a product or service is undertaken; the maturity phase, in which the direct use of the product and the advent of product-enabled services establish the new economic sector, and an eventual decline phase when one or more substitute products appear. Most of the current industrial products may be considered systems. The application of established concepts, such as interchangeable parts, permits firms to manufacture systems on a large scale, making sophisticated products available to society at manageable prices. The large availability of a product in a socioeconomic environment favors the use of this product in innovative ways, many of them unprecedented. In this way, introducing an innovative product in the market may nucleate a whole new industry over time, which may experience growth either through the continual evolvement of the product or expansion of the breadth of applications. Recent years have shown impressive development in the space industry. This article presents data that suggests that the global satellite space industry is transitioning from a growth to a maturity stage. It will be argued that barriers to entry are still at a level that permits Brazil, given its current position, to engage in the global space industry.
{"title":"The Coming of Age of Space Satellite Industry: Transitioning from a Growth to a Maturity Life Cycle Phase","authors":"L. Perondi","doi":"10.1590/jatm.v15.1291","DOIUrl":"https://doi.org/10.1590/jatm.v15.1291","url":null,"abstract":"From the perspective of the evolution of modern mass-production industrial sectors, the establishment of an industry can occur in a typical sequence of four conceptual phases: the introduction phase, in which a new technological concept is introduced; the growth phase, in which application of this concept in the form of a product or service is undertaken; the maturity phase, in which the direct use of the product and the advent of product-enabled services establish the new economic sector, and an eventual decline phase when one or more substitute products appear. Most of the current industrial products may be considered systems. The application of established concepts, such as interchangeable parts, permits firms to manufacture systems on a large scale, making sophisticated products available to society at manageable prices. The large availability of a product in a socioeconomic environment favors the use of this product in innovative ways, many of them unprecedented. In this way, introducing an innovative product in the market may nucleate a whole new industry over time, which may experience growth either through the continual evolvement of the product or expansion of the breadth of applications. Recent years have shown impressive development in the space industry. This article presents data that suggests that the global satellite space industry is transitioning from a growth to a maturity stage. It will be argued that barriers to entry are still at a level that permits Brazil, given its current position, to engage in the global space industry.","PeriodicalId":14872,"journal":{"name":"Journal of Aerospace Technology and Management","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67185847","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}
E. R. Paula, J. Monico, Ítalo Tsuchiya, C. Valladares, S. Costa, L. Marini-Pereira, B. Vani, A. Moraes
The use of Global Navigation Satellite System (GNSS) for air and terrestrial navigation and for many applications is increasing in the last decades. However, the Earth’s ionosphere causes GNSS signal delay due to the total electron content (TEC) and scintillation in the signal phase and amplitude. This scintillation can give rise to deleterious effects in the GNSS positioning. So, it is important to assess the effects of the ionosphere over the GNSS signal. To achieve this goal, it is necessary to have a large spatial and temporal coverage of data from many different sounders, being the GNSS receivers of great importance due to their global coverage and availability. In this work, we present a retrospective of the scintillation monitoring networks in Brazil and their characteristics. As the RBMC network managed by the IBGE provides TEC and as rate of TEC index (ROTI) is well correlated with ionospheric irregularities, we present also the RBMC network description. These RBMC GNSS receivers provide data in regions with scarcity of scintillation monitors. The description of the Ionospheric Scintillation Monitoring Receivers (ISMR) Query Tool, that is a web software that has been supporting research on the ISMR data, is also presented.
{"title":"A Retrospective of Global Navigation Satellite System Ionospheric Irregularities Monitoring Networks in Brazil","authors":"E. R. Paula, J. Monico, Ítalo Tsuchiya, C. Valladares, S. Costa, L. Marini-Pereira, B. Vani, A. Moraes","doi":"10.1590/jatm.v15.1288","DOIUrl":"https://doi.org/10.1590/jatm.v15.1288","url":null,"abstract":"The use of Global Navigation Satellite System (GNSS) for air and terrestrial navigation and for many applications is increasing in the last decades. However, the Earth’s ionosphere causes GNSS signal delay due to the total electron content (TEC) and scintillation in the signal phase and amplitude. This scintillation can give rise to deleterious effects in the GNSS positioning. So, it is important to assess the effects of the ionosphere over the GNSS signal. To achieve this goal, it is necessary to have a large spatial and temporal coverage of data from many different sounders, being the GNSS receivers of great importance due to their global coverage and availability. In this work, we present a retrospective of the scintillation monitoring networks in Brazil and their characteristics. As the RBMC network managed by the IBGE provides TEC and as rate of TEC index (ROTI) is well correlated with ionospheric irregularities, we present also the RBMC network description. These RBMC GNSS receivers provide data in regions with scarcity of scintillation monitors. The description of the Ionospheric Scintillation Monitoring Receivers (ISMR) Query Tool, that is a web software that has been supporting research on the ISMR data, is also presented.","PeriodicalId":14872,"journal":{"name":"Journal of Aerospace Technology and Management","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67185798","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}
Ruaa Braz Dahham, N. A. Hashim, F. M. K. Al-Fatlwe
Couple stresses because of magnetic particles additives on the lubrication performance of a journal bearing system was embraced and scrutinized in the current examinations theoretically. The governing equations of Reynolds (pressure field), energy (temperature field), and heat conduction (temperature field through the solids) are coupled and solved instantaneously in term of temperature and viscosity. After these set of equation pressure is obtained, it is used to obtain the bearing characteristic. It was found that the load currying capacity and maximum pressure are increased due the employing of magnetic fluids along with the couple stresses, as well as side leakage flow and the friction coefficient are decreased. It can be also concluded that the magnetic fluids with couple stresses are better lubricant than magnetic fluid only ( l _ = 0), Newtonian fluids, and couple stress fluid ( = 0).
{"title":"Three-Dimensional Thermohydrodynamic Analysis of Journal Bearing Lubricated by Magnetic Fluids with Couple Stresses","authors":"Ruaa Braz Dahham, N. A. Hashim, F. M. K. Al-Fatlwe","doi":"10.1590/jatm.v15.1290","DOIUrl":"https://doi.org/10.1590/jatm.v15.1290","url":null,"abstract":"Couple stresses because of magnetic particles additives on the lubrication performance of a journal bearing system was embraced and scrutinized in the current examinations theoretically. The governing equations of Reynolds (pressure field), energy (temperature field), and heat conduction (temperature field through the solids) are coupled and solved instantaneously in term of temperature and viscosity. After these set of equation pressure is obtained, it is used to obtain the bearing characteristic. It was found that the load currying capacity and maximum pressure are increased due the employing of magnetic fluids along with the couple stresses, as well as side leakage flow and the friction coefficient are decreased. It can be also concluded that the magnetic fluids with couple stresses are better lubricant than magnetic fluid only ( l _ = 0), Newtonian fluids, and couple stress fluid ( = 0).","PeriodicalId":14872,"journal":{"name":"Journal of Aerospace Technology and Management","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67185836","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}
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