Double-gimbal variable-speed control momentum gyroscopes (DGVSCMGs) have been attracting attention as actuators for satellite attitude control. The DGVSCMG has the advantage in that it can provide three-axis torque using a single unit, and various control methods have been actively investigated. However, previous studies only evaluated control performance via numerical simulations. The authors experimentally evaluate the control performance of the proposed DGVSCMG for practical verification. An experimental DGVSCMG machine was fabricated and three-axis attitude control in the gravity environment of an indoor experiment was achieved. The results are compared with numerical simulation results to confirm the validity of the proposed dynamics model and control system.
{"title":"Experimental Verification for Attitude Control of Spacecraft Utilizing Double-Gimbal Variable-Speed Control Moment Gyroscopes","authors":"Sayaka KANATA, Futa HAYASHIDA, Takashi SHIMOMURA","doi":"10.2322/tjsass.66.209","DOIUrl":"https://doi.org/10.2322/tjsass.66.209","url":null,"abstract":"Double-gimbal variable-speed control momentum gyroscopes (DGVSCMGs) have been attracting attention as actuators for satellite attitude control. The DGVSCMG has the advantage in that it can provide three-axis torque using a single unit, and various control methods have been actively investigated. However, previous studies only evaluated control performance via numerical simulations. The authors experimentally evaluate the control performance of the proposed DGVSCMG for practical verification. An experimental DGVSCMG machine was fabricated and three-axis attitude control in the gravity environment of an indoor experiment was achieved. The results are compared with numerical simulation results to confirm the validity of the proposed dynamics model and control system.","PeriodicalId":54419,"journal":{"name":"Transactions of the Japan Society for Aeronautical and Space Sciences","volume":"155 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134982436","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Study on Nonlinear Dynamics Using the State Space of Combustion Oscillation in a Rocket Combustor","authors":"Fumiya Arai, Kazuki Iemura, Masanori Saito, Mitsuaki Tanabe","doi":"10.2322/tjsass.66.156","DOIUrl":"https://doi.org/10.2322/tjsass.66.156","url":null,"abstract":"","PeriodicalId":54419,"journal":{"name":"Transactions of the Japan Society for Aeronautical and Space Sciences","volume":"1 1","pages":""},"PeriodicalIF":1.1,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68666086","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Analysis of Dynamic Stresses in the Elastic Nets for Space Debris Capture","authors":"P. Trivailo, H. Kojima","doi":"10.2322/tjsass.66.26","DOIUrl":"https://doi.org/10.2322/tjsass.66.26","url":null,"abstract":"","PeriodicalId":54419,"journal":{"name":"Transactions of the Japan Society for Aeronautical and Space Sciences","volume":"1 1","pages":""},"PeriodicalIF":1.1,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68666205","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The Jovian moons have been visited by several flyby missions and are attracting more attention for long-term observation. However, because of Jupiter’s gravitational perturbations and the J2 and C2,2 terms of the Jovian moons, orbits around these moons are unstable, especially those orbits with high inclinations. This study considers a scenario in which the spacecraft flies at a high altitude equipped with a payload having a small field-of-view angle. The coverage rate is achieved by numerical integration, and the largest coverage rate can be found using the particle swarm optimization method. The results highlight the possibility of obtaining a greater coverage rate, as well as considerable imaging resolution and mission duration by choosing suitable candidate orbits. A station-keeping algorithm is introduced to produce a more accurate estimation of gravitational models that is indexed using the station-keeping cost and estimation accuracy. Based on the five aspects mentioned above, a systematic evaluation of candidate orbits was created for orbit design.
{"title":"Systematic Orbital Design for a Jovian Moon Exploring Mission","authors":"Tianji CHEN, Ming XU, Zhan FENG, Junjie REN","doi":"10.2322/tjsass.66.234","DOIUrl":"https://doi.org/10.2322/tjsass.66.234","url":null,"abstract":"The Jovian moons have been visited by several flyby missions and are attracting more attention for long-term observation. However, because of Jupiter’s gravitational perturbations and the J2 and C2,2 terms of the Jovian moons, orbits around these moons are unstable, especially those orbits with high inclinations. This study considers a scenario in which the spacecraft flies at a high altitude equipped with a payload having a small field-of-view angle. The coverage rate is achieved by numerical integration, and the largest coverage rate can be found using the particle swarm optimization method. The results highlight the possibility of obtaining a greater coverage rate, as well as considerable imaging resolution and mission duration by choosing suitable candidate orbits. A station-keeping algorithm is introduced to produce a more accurate estimation of gravitational models that is indexed using the station-keeping cost and estimation accuracy. Based on the five aspects mentioned above, a systematic evaluation of candidate orbits was created for orbit design.","PeriodicalId":54419,"journal":{"name":"Transactions of the Japan Society for Aeronautical and Space Sciences","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134982433","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A numerical simulation method of computational fluid dynamics (CFD) coupling with a trim analysis for coaxial rotor systems is described in this paper. The trim analysis is implemented using a rotorcraft flow solver, rFlow3D. Six target forces and moments, which are the thrust of the coaxial rotor system, the rolling and pitching moments for each upper and lower rotor, and the torque balance for yaw control, are considered as the trim conditions. The blade pitch angles of both upper and lower rotors are adjusted to satisfy the target trim conditions through the trim analysis by being loosely coupled with the CFD solver. Verification of the trim analysis method and validation of the prediction accuracy of aerodynamic performance are performed based on previous experimental and numerical studies in hover and forward flight using the lift-offset conditions. It is shown that the predicted hover performances of the torque-balanced coaxial rotors are in excellent agreement with the experimental data. It is also verified that the lift-offset conditions in forward flight are simulated using this established trim analysis. Furthermore, reasonable agreements with other computational results are indicated.
{"title":"A Coupled CFD/Trim Analysis of Coaxial Rotors","authors":"H. Sugawara, Y. Tanabe, M. Kameda","doi":"10.2322/tjsass.65.262","DOIUrl":"https://doi.org/10.2322/tjsass.65.262","url":null,"abstract":"A numerical simulation method of computational fluid dynamics (CFD) coupling with a trim analysis for coaxial rotor systems is described in this paper. The trim analysis is implemented using a rotorcraft flow solver, rFlow3D. Six target forces and moments, which are the thrust of the coaxial rotor system, the rolling and pitching moments for each upper and lower rotor, and the torque balance for yaw control, are considered as the trim conditions. The blade pitch angles of both upper and lower rotors are adjusted to satisfy the target trim conditions through the trim analysis by being loosely coupled with the CFD solver. Verification of the trim analysis method and validation of the prediction accuracy of aerodynamic performance are performed based on previous experimental and numerical studies in hover and forward flight using the lift-offset conditions. It is shown that the predicted hover performances of the torque-balanced coaxial rotors are in excellent agreement with the experimental data. It is also verified that the lift-offset conditions in forward flight are simulated using this established trim analysis. Furthermore, reasonable agreements with other computational results are indicated.","PeriodicalId":54419,"journal":{"name":"Transactions of the Japan Society for Aeronautical and Space Sciences","volume":" ","pages":""},"PeriodicalIF":1.1,"publicationDate":"2022-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43906574","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Abstracts of the Papers Published in Journal of the Japan Society for Aeronautical and Space Sciences (Vol. 69, No. 6, Dec. 2021)","authors":"","doi":"10.2322/tjsass.65.44","DOIUrl":"https://doi.org/10.2322/tjsass.65.44","url":null,"abstract":"","PeriodicalId":54419,"journal":{"name":"Transactions of the Japan Society for Aeronautical and Space Sciences","volume":" ","pages":""},"PeriodicalIF":1.1,"publicationDate":"2022-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43645656","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Transactions of the JSASS has been reformed as an international journal from Apr. 1, 2014. A new editorial process has been introduced, and associate editors were assigned. Manuscripts that are received on or after April 1 2014 are peerreviewed in the new editorial process. From Apr. 1 2015, Transactions of the JSASS started to include the papers through the new editorial process, and started to issue as an international ‘‘on-line access’’ journal. The Editor-in-Chief wishes to thank the following Associate Editors, who have donated their time and expertise to assist in selecting the novel and high-quality articles among the 89 submissions the Transactions of JSASS receives in 2015. Editor-in-Chief Kimiya KOMURASAKI
{"title":"Acknowledgments to Associate Editors","authors":"Y. Matsuo","doi":"10.2322/tjsass.59.46","DOIUrl":"https://doi.org/10.2322/tjsass.59.46","url":null,"abstract":"Transactions of the JSASS has been reformed as an international journal from Apr. 1, 2014. A new editorial process has been introduced, and associate editors were assigned. Manuscripts that are received on or after April 1 2014 are peerreviewed in the new editorial process. From Apr. 1 2015, Transactions of the JSASS started to include the papers through the new editorial process, and started to issue as an international ‘‘on-line access’’ journal. The Editor-in-Chief wishes to thank the following Associate Editors, who have donated their time and expertise to assist in selecting the novel and high-quality articles among the 89 submissions the Transactions of JSASS receives in 2015. Editor-in-Chief Kimiya KOMURASAKI","PeriodicalId":54419,"journal":{"name":"Transactions of the Japan Society for Aeronautical and Space Sciences","volume":"1 1","pages":""},"PeriodicalIF":1.1,"publicationDate":"2022-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.2322/tjsass.59.46","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43273854","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
There have been several advanced space missions using large gossamer space structures proposed recently, such as a spinning solar sail. However, only certain missions have been implemented, primarily because the on-orbit dynamic behavior of such structures cannot be precisely predicted through ground tests. To address this limitation, a scale law between a small- and a full-scale model of large membrane structures is proposed herein. In addition, small or reduced-order models for numerical simulations are proposed to reduce computation costs. However, the development of a small model, which has to be completely identical (geometrically) to the full-scale model, is challenging. Thus, a scale law between the small- and full-scale models of a large gossamer space structure, which is geometrically non-similar to the full-scale model, is also proposed. The scale law is also applied to the spin deployment motion of thin membrane and veri fi ed using numerical simulations.
{"title":"Scaling Law for Spin Deployment of Large-Membrane Structures Acceptable for Geometrical Mismatch","authors":"Asuka Tatara, Yasuyuki Miyazaki","doi":"10.2322/tjsass.65.11","DOIUrl":"https://doi.org/10.2322/tjsass.65.11","url":null,"abstract":"There have been several advanced space missions using large gossamer space structures proposed recently, such as a spinning solar sail. However, only certain missions have been implemented, primarily because the on-orbit dynamic behavior of such structures cannot be precisely predicted through ground tests. To address this limitation, a scale law between a small- and a full-scale model of large membrane structures is proposed herein. In addition, small or reduced-order models for numerical simulations are proposed to reduce computation costs. However, the development of a small model, which has to be completely identical (geometrically) to the full-scale model, is challenging. Thus, a scale law between the small- and full-scale models of a large gossamer space structure, which is geometrically non-similar to the full-scale model, is also proposed. The scale law is also applied to the spin deployment motion of thin membrane and veri fi ed using numerical simulations.","PeriodicalId":54419,"journal":{"name":"Transactions of the Japan Society for Aeronautical and Space Sciences","volume":"1 1","pages":""},"PeriodicalIF":1.1,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68664228","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Capture Area Ratio and Drag Difference between Wind Tunnel and Flight Tests","authors":"Kento Yamada, T. Uchiyama, M. Ueno","doi":"10.2322/tjsass.65.134","DOIUrl":"https://doi.org/10.2322/tjsass.65.134","url":null,"abstract":"","PeriodicalId":54419,"journal":{"name":"Transactions of the Japan Society for Aeronautical and Space Sciences","volume":"1 1","pages":""},"PeriodicalIF":1.1,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68664252","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Wakako Yamaguchi, Toshiya Yanase, Jun Ishihara, Asuka Nakatani, T. Handa, Yosuke Sugioka, S. Koike
{"title":"Study on Decay Characteristics of FLEET Emission in Air for High-resolution Measurements of Supersonic Flows","authors":"Wakako Yamaguchi, Toshiya Yanase, Jun Ishihara, Asuka Nakatani, T. Handa, Yosuke Sugioka, S. Koike","doi":"10.2322/tjsass.65.109","DOIUrl":"https://doi.org/10.2322/tjsass.65.109","url":null,"abstract":"","PeriodicalId":54419,"journal":{"name":"Transactions of the Japan Society for Aeronautical and Space Sciences","volume":"1 1","pages":""},"PeriodicalIF":1.1,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68664676","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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