{"title":"Study on Hysteresis of Combustion Oscillation in Continuously Variable Resonance Combustor using Deep Neural Network","authors":"Kazunori Motohashi, Masanori Saito, Mitsuaki Tanabe","doi":"10.2322/tastj.19.570","DOIUrl":"https://doi.org/10.2322/tastj.19.570","url":null,"abstract":"","PeriodicalId":120185,"journal":{"name":"TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES, AEROSPACE TECHNOLOGY JAPAN","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132536218","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 paper proposes a new strategy for improving deployment repeatability in deployable structures using kinematic couplings. In this strategy, the order of the pressing and the pressing load applied to the coupling are controlled to meet the necessary conditions. The basic theory for latch completion conditions is derived based on our previous study, which revealed the mating completion conditions of kinematic couplings. An experimental model that consists of two circular plates and three parts of two–degrees of restraint (2–DOR) (balls with grooves) with pressing load mechanisms using tension springs is developed. The shape repeatability in the experimental model is evaluated by measuring the relative displacements of two plates in each installation while changing the pressing order and load applied. The effects pressing order and load applied on shape repeatability are evaluated through these experiments, and the effectiveness of the strategy for pressing load adjustment is demonstrated.
{"title":"Strategy and Demonstration of Latch Mechanisms with Kinematic Coupling for Precise Deployable Structures","authors":"K. Takagi, Hiroaki Tanaka, K. Ishimura","doi":"10.2322/TASTJ.17.583","DOIUrl":"https://doi.org/10.2322/TASTJ.17.583","url":null,"abstract":"This paper proposes a new strategy for improving deployment repeatability in deployable structures using kinematic couplings. In this strategy, the order of the pressing and the pressing load applied to the coupling are controlled to meet the necessary conditions. The basic theory for latch completion conditions is derived based on our previous study, which revealed the mating completion conditions of kinematic couplings. An experimental model that consists of two circular plates and three parts of two–degrees of restraint (2–DOR) (balls with grooves) with pressing load mechanisms using tension springs is developed. The shape repeatability in the experimental model is evaluated by measuring the relative displacements of two plates in each installation while changing the pressing order and load applied. The effects pressing order and load applied on shape repeatability are evaluated through these experiments, and the effectiveness of the strategy for pressing load adjustment is demonstrated.","PeriodicalId":120185,"journal":{"name":"TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES, AEROSPACE TECHNOLOGY JAPAN","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132546857","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}
Nomenclature a : semi measure axis ave : average BL : baseline C : non-linear observation matrix CVL : curvilinear D : representative diameter of target DCR : dual co-elliptic rendezvous h : relative height e : eccentricity i : inclination L : relative length LVLH : local vertical local horizontal p(Δv) : length or vector of BL by Δv r : radius R : range rms : root mean square RM : ranging model SOR : stable orbit rendezvous v : velocity x : state vector δ : error φ : elevation angle η : azimuth angle ω : augment of perigee, or target angular size Ω : ascending node
{"title":"Effect of Observation by Angle Only Navigation to Plan Non-Cooperative Approach for ADR","authors":"M. Ikeuchi","doi":"10.2322/TASTJ.17.471","DOIUrl":"https://doi.org/10.2322/TASTJ.17.471","url":null,"abstract":"Nomenclature a : semi measure axis ave : average BL : baseline C : non-linear observation matrix CVL : curvilinear D : representative diameter of target DCR : dual co-elliptic rendezvous h : relative height e : eccentricity i : inclination L : relative length LVLH : local vertical local horizontal p(Δv) : length or vector of BL by Δv r : radius R : range rms : root mean square RM : ranging model SOR : stable orbit rendezvous v : velocity x : state vector δ : error φ : elevation angle η : azimuth angle ω : augment of perigee, or target angular size Ω : ascending node","PeriodicalId":120185,"journal":{"name":"TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES, AEROSPACE TECHNOLOGY JAPAN","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130027645","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}
Ikeda Ryota, Mori Osamu, Satoh Yasutaka, Sugawara Yoshiki
IKAROS, a solar sail spacecraft launched in 2010, demonstrated that thin-film solar cells can generate electricity. During this demonstration, it was found that the cells became curved, which destabilized the attitude of the spacecraft. Therefore, this study focused on a sputtering deposition technique that generates internal stress during the formation of thin films. The objective of this study was to control the curvature of a multilayer film by sputtering with a pattern. The effect of sputtering on the thin film was analyzed through experiments and simulations, and it was clarified that the cause of shape non-reproducibility is sputtering-induced stress.
{"title":"Deformation Direction and Curvature Control of Multilayer Thin Films Produced by Sputtering","authors":"Ikeda Ryota, Mori Osamu, Satoh Yasutaka, Sugawara Yoshiki","doi":"10.2322/tastj.17.603","DOIUrl":"https://doi.org/10.2322/tastj.17.603","url":null,"abstract":"IKAROS, a solar sail spacecraft launched in 2010, demonstrated that thin-film solar cells can generate electricity. During this demonstration, it was found that the cells became curved, which destabilized the attitude of the spacecraft. Therefore, this study focused on a sputtering deposition technique that generates internal stress during the formation of thin films. The objective of this study was to control the curvature of a multilayer film by sputtering with a pattern. The effect of sputtering on the thin film was analyzed through experiments and simulations, and it was clarified that the cause of shape non-reproducibility is sputtering-induced stress.","PeriodicalId":120185,"journal":{"name":"TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES, AEROSPACE TECHNOLOGY JAPAN","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134327425","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}
{"title":"Wind Estimation Based on Estimation of Lateral-Directional Stability Derivatives of Aircraft","authors":"H. Luu, Y. Ochi","doi":"10.2322/tastj.21.1","DOIUrl":"https://doi.org/10.2322/tastj.21.1","url":null,"abstract":"","PeriodicalId":120185,"journal":{"name":"TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES, AEROSPACE TECHNOLOGY JAPAN","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131723658","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}
Hideki Sato, Shinichi Kimura, I. Ueno, Hideyuki Suzuki, T. Tatsukawa, K. Fujii, M. Yamamoto, C. Mukai
In 2015, Tokyo University of Science (TUS) started the TUS Space Educational Program (T-SEP). This program includes not only lectures on space science and technology but also hands-on trainings with onboard equipment and project-based learning utilizing parabolic microgravity flight and CANSAT. During such project-based learning process, students learn the complete process involved in space missions, such as mission design, implementation, project management, and operations regarding various constraints. Such learning is very effective for acquiring individual knowledge of space science and technology and also acquiring skills required for space missions. The first author of this paper was one of the first T-SEP students in 2015 and one of the best examples of the impact of this program. In addition, he continues to participate as a mentor to support T-SEP. This paper outlines T-SEP results since 2015 from the viewpoint of a mentor having experience as one of the first students.
{"title":"Space Educational Program of the Tokyo University of Science: A Trial for Space Education","authors":"Hideki Sato, Shinichi Kimura, I. Ueno, Hideyuki Suzuki, T. Tatsukawa, K. Fujii, M. Yamamoto, C. Mukai","doi":"10.2322/TASTJ.17.25","DOIUrl":"https://doi.org/10.2322/TASTJ.17.25","url":null,"abstract":"In 2015, Tokyo University of Science (TUS) started the TUS Space Educational Program (T-SEP). This program includes not only lectures on space science and technology but also hands-on trainings with onboard equipment and project-based learning utilizing parabolic microgravity flight and CANSAT. During such project-based learning process, students learn the complete process involved in space missions, such as mission design, implementation, project management, and operations regarding various constraints. Such learning is very effective for acquiring individual knowledge of space science and technology and also acquiring skills required for space missions. The first author of this paper was one of the first T-SEP students in 2015 and one of the best examples of the impact of this program. In addition, he continues to participate as a mentor to support T-SEP. This paper outlines T-SEP results since 2015 from the viewpoint of a mentor having experience as one of the first students.","PeriodicalId":120185,"journal":{"name":"TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES, AEROSPACE TECHNOLOGY JAPAN","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128933275","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}
Hayabusa2 is a current sample return mission spacecraft developed by JAXA. One of the most important scientific objectives of Hayabusa2 is to investigate the chemical and physical properties of the internal materials and structures of the asteroid Ryugu. To achieve this goal, we developed a new device called the small carry-on impactor (SCI). The SCI is a kinetic impactor that is being used to create an artificial crater on the surface of Ryugu. It has no attitude or orbit control device. The helical spring in the separation mechanism provides both separation force and spin torque to the SCI. The impact accuracy of the SCI depends heavily on the separation accuracy. Repeating a large number of separation tests is a straightforward approach to evaluate the separation accuracy. However, that is not realistic. Hence, first we performed several element tests to understand the separation dynamics. Then, the final separation accuracy was evaluated through a small number of separation tests, and this was followed by simulations that used the results of the element tests. This paper provides an overview of the separation mechanism, the results of development testing analyzed in detail, and a summary of the separation performance.
{"title":"Evaluation of the Separation Mechanism for a Small Carry-on Impactor aboard Hayabusa2","authors":"T. Saiki, H. Imamura, N. Sano, H. Ohtsuka","doi":"10.2322/tastj.18.9","DOIUrl":"https://doi.org/10.2322/tastj.18.9","url":null,"abstract":"Hayabusa2 is a current sample return mission spacecraft developed by JAXA. One of the most important scientific objectives of Hayabusa2 is to investigate the chemical and physical properties of the internal materials and structures of the asteroid Ryugu. To achieve this goal, we developed a new device called the small carry-on impactor (SCI). The SCI is a kinetic impactor that is being used to create an artificial crater on the surface of Ryugu. It has no attitude or orbit control device. The helical spring in the separation mechanism provides both separation force and spin torque to the SCI. The impact accuracy of the SCI depends heavily on the separation accuracy. Repeating a large number of separation tests is a straightforward approach to evaluate the separation accuracy. However, that is not realistic. Hence, first we performed several element tests to understand the separation dynamics. Then, the final separation accuracy was evaluated through a small number of separation tests, and this was followed by simulations that used the results of the element tests. This paper provides an overview of the separation mechanism, the results of development testing analyzed in detail, and a summary of the separation performance.","PeriodicalId":120185,"journal":{"name":"TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES, AEROSPACE TECHNOLOGY JAPAN","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130763740","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}
{"title":"Stability Analysis of Spacecraft Motion in the Vicinity of a Second Body in the Elliptic Restricted Three-body Problem","authors":"Y. Asano, Satoshi Satoh, Katsuhiko Yamada","doi":"10.2322/tastj.19.461","DOIUrl":"https://doi.org/10.2322/tastj.19.461","url":null,"abstract":"","PeriodicalId":120185,"journal":{"name":"TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES, AEROSPACE TECHNOLOGY JAPAN","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133544497","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}
Atsushi Yasuda, A. Nagata, Hiromasa Watanabe, T. Kameda
ITF-2, which was developed by the University of Tsukuba YUI project, was designed based on ITF-1. ITF-1 was the first CubeSat at the University of Tsukuba; however, signals were never received. Although ITF-2 was developed based on ITF1, the components that resulted in failure were reconsidered and improved for use in ITF-2. In this paper, the overview, subsystems of ITF-2, and the design improvement from ITF-1 to ITF-2 are presented. In addition, ITF-2 was deployed from “Kibo” on January 16, 2017 and it is still operational as of September 2017. This paper reports the operation results and the achievement of missions: “YUI network”, which is a “participatory” mission using CubeSat, involving participation from people around the world, ultra-small antenna, which is used for two amateur bands by attaching it to a metal structure, and a new microcontroller, which has been reported to be saving energy, high radiation resistant and demonstrated to acquire a new achievement in space. The operation results as of September 2017 indicate that more than 900 reception reports from 19 countries were reported, indicating the success of the outreach.
{"title":"Nano Satellite “ITF-2” Developed by University of Tsukuba YUI Project","authors":"Atsushi Yasuda, A. Nagata, Hiromasa Watanabe, T. Kameda","doi":"10.2322/TASTJ.17.253","DOIUrl":"https://doi.org/10.2322/TASTJ.17.253","url":null,"abstract":"ITF-2, which was developed by the University of Tsukuba YUI project, was designed based on ITF-1. ITF-1 was the first CubeSat at the University of Tsukuba; however, signals were never received. Although ITF-2 was developed based on ITF1, the components that resulted in failure were reconsidered and improved for use in ITF-2. In this paper, the overview, subsystems of ITF-2, and the design improvement from ITF-1 to ITF-2 are presented. In addition, ITF-2 was deployed from “Kibo” on January 16, 2017 and it is still operational as of September 2017. This paper reports the operation results and the achievement of missions: “YUI network”, which is a “participatory” mission using CubeSat, involving participation from people around the world, ultra-small antenna, which is used for two amateur bands by attaching it to a metal structure, and a new microcontroller, which has been reported to be saving energy, high radiation resistant and demonstrated to acquire a new achievement in space. The operation results as of September 2017 indicate that more than 900 reception reports from 19 countries were reported, indicating the success of the outreach.","PeriodicalId":120185,"journal":{"name":"TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES, AEROSPACE TECHNOLOGY JAPAN","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133295751","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}
J. Kikuchi, Ryo Nakamura, Y. Matsumoto, D. Goto, Moeko Hidaka, S. Ueda
{"title":"Perilune Rendezvous Method of Earth-NRHO Transfer Orbit for Cargo Transportation Mission to Gateway","authors":"J. Kikuchi, Ryo Nakamura, Y. Matsumoto, D. Goto, Moeko Hidaka, S. Ueda","doi":"10.2322/tastj.20.26","DOIUrl":"https://doi.org/10.2322/tastj.20.26","url":null,"abstract":"","PeriodicalId":120185,"journal":{"name":"TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES, AEROSPACE TECHNOLOGY JAPAN","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133758161","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：