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面外せん断変形を考慮した異方性円筒殻の軸圧縮・ねじりおよび複合荷重に対する閉じた解;面外せん断変形を考慮した異方性円筒殻の軸圧縮・ねじりおよび複合荷重に対する閉じた解;Closed-Form Solution of Thin and Moderately Thick Anisotropic Cylinders under Torsion, Axial Compression and Combined Load 针对考虑面外剪切变形的各向异性圆筒壳的轴压缩、扭转及复合载荷的闭合解决;针对考虑面外剪切变形的各向异性圆筒壳的轴压缩、扭转及复合载荷的闭合解决;Closed-Form Solution of Thin and Moderately Thick Anisotropic Cylinders under Torsion，Axial Compression and组合Load
AEROSPACE TECHNOLOGY JAPAN, THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES Pub Date : 1900-01-01 DOI: 10.2322/ASTJ.13.77
A. Takano
{"title":"面外せん断変形を考慮した異方性円筒殻の軸圧縮・ねじりおよび複合荷重に対する閉じた解;面外せん断変形を考慮した異方性円筒殻の軸圧縮・ねじりおよび複合荷重に対する閉じた解;Closed-Form Solution of Thin and Moderately Thick Anisotropic Cylinders under Torsion, Axial Compression and Combined Load","authors":"A. Takano","doi":"10.2322/ASTJ.13.77","DOIUrl":"https://doi.org/10.2322/ASTJ.13.77","url":null,"abstract":"","PeriodicalId":138366,"journal":{"name":"AEROSPACE TECHNOLOGY JAPAN, THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125852703","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
A Study on the Probability of Midair Collisions 空中碰撞概率的研究
AEROSPACE TECHNOLOGY JAPAN, THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES Pub Date : 1900-01-01 DOI: 10.2322/ASTJ.10.61
Y. Miyazawa, N. K. Wickramasinghe
{"title":"A Study on the Probability of Midair Collisions","authors":"Y. Miyazawa, N. K. Wickramasinghe","doi":"10.2322/ASTJ.10.61","DOIUrl":"https://doi.org/10.2322/ASTJ.10.61","url":null,"abstract":"Air traffic control system is expected to evolve in order to respond to strong demand of air traffic growth by employing new technologies. Quantitative evaluation of safety is one of the most important issues for smooth transfer of new technologies or introduction of new rules for automation in air traffic systems. Probability evaluation of midair collision is a typical problem of the safety analysis. This paper discusses a classical problem of midair collision on an airway. Normal distribution is assumed for simplicity to evaluate the collision probability, and standard deviation of the distribution is taken as an uncertainty parameter to assess the effect of uncertainty. The approach can explain the so called “navigation paradox,” and it naturally introduces lateral-offset, or side-stepping, which is a long proposed scheme as a solution of the paradox in the airway guidance.","PeriodicalId":138366,"journal":{"name":"AEROSPACE TECHNOLOGY JAPAN, THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128415119","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
Upgraded Space Debris Evolutionary Model for the Geosynchronous Earth Orbit 改进的地球同步轨道空间碎片演化模型
AEROSPACE TECHNOLOGY JAPAN, THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES Pub Date : 1900-01-01 DOI: 10.2322/ASTJ.11.61
Y. Ariyoshi, T. Hanada
{"title":"Upgraded Space Debris Evolutionary Model for the Geosynchronous Earth Orbit","authors":"Y. Ariyoshi, T. Hanada","doi":"10.2322/ASTJ.11.61","DOIUrl":"https://doi.org/10.2322/ASTJ.11.61","url":null,"abstract":"Space debris environment evolutionary model for the geosynchronous Earth orbit region, GEODEEM, developed by Kyushu University was upgraded for better understanding. This paper explain the key features of this upgraded model. One of keys of this upgrade is that all satellites larger than 10 cm in size are tracked individually. The benefits of this upgrade are: 1) collision accidents can be estimated based upon one-by-one collision probabilities, and 2) more realistic scenarios like removing certain objects from orbits can be applied. This paper also present the latest prediction of future space debris environment from 2008 to 2108. The model indicates that explosion is the main debris production mode in next 100 years.","PeriodicalId":138366,"journal":{"name":"AEROSPACE TECHNOLOGY JAPAN, THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129780568","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
Capability of GPGPU for Faster Thermal Analysis Used in Data Assimilation GPGPU在数据同化中的快速热分析能力
AEROSPACE TECHNOLOGY JAPAN, THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES Pub Date : 1900-01-01 DOI: 10.2322/ASTJ.11.35
R. Takaki, T. Akita, E. Shima
{"title":"Capability of GPGPU for Faster Thermal Analysis Used in Data Assimilation","authors":"R. Takaki, T. Akita, E. Shima","doi":"10.2322/ASTJ.11.35","DOIUrl":"https://doi.org/10.2322/ASTJ.11.35","url":null,"abstract":"A thermal mathematical model plays an important role in operations on orbit as well as spacecraft thermal designs. The thermal mathematical model has some uncertain thermal characteristic parameters, such as thermal contact resistances between components, effective emittances of multilayer insulation (MLI) blankets, discouraging make up efficiency and accuracy of the model. A particle filter which is one of successive data assimilation methods has been applied to construct spacecraft thermal mathematical models. This method conducts a lot of ensemble computations, which require large computational power. Recently, General Purpose computing in Graphics Processing Unit (GPGPU) has been attracted attention in high performance computing. Therefore GPGPU is applied to increase the computational speed of thermal analysis used in the particle filter. This paper shows the speed-up results by using GPGPU as well as the application method of GPGPU.","PeriodicalId":138366,"journal":{"name":"AEROSPACE TECHNOLOGY JAPAN, THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127467582","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
Evaluation of the Strength of Brazed Joints in Ceramics/Metal Thruster 陶瓷/金属推力器钎焊接头强度评价
AEROSPACE TECHNOLOGY JAPAN, THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES Pub Date : 1900-01-01 DOI: 10.2322/ASTJ.JSASS-D-17-00021
H. Tobe, K. Michigami, S. Sawai, E. Sato, Nobuhiko Tanaka, Hiroyuki Mishima, T. Matsuo, Daijiro Shiraiwa, Y. Nonaka
{"title":"Evaluation of the Strength of Brazed Joints in Ceramics/Metal Thruster","authors":"H. Tobe, K. Michigami, S. Sawai, E. Sato, Nobuhiko Tanaka, Hiroyuki Mishima, T. Matsuo, Daijiro Shiraiwa, Y. Nonaka","doi":"10.2322/ASTJ.JSASS-D-17-00021","DOIUrl":"https://doi.org/10.2322/ASTJ.JSASS-D-17-00021","url":null,"abstract":"","PeriodicalId":138366,"journal":{"name":"AEROSPACE TECHNOLOGY JAPAN, THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127487478","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: 4
より戻しモータのみを用いた気球ゴンドラ方向制御とGAPS実験への適用;より戻しモータのみを用いた気球ゴンドラ方向制御とGAPS実験への適用;Direction Control of Balloon Gondola with Only Untwisting Motor and Application to GAPS Project 仅采用回弹马达的气球吊舱方向控制及GAPS实验应用;仅采用回弹马达的气球吊舱方向控制及GAPS实验应用;Direction Control of Balloon Gondola with Only Untwisting Motor and Application to GAPS Project
AEROSPACE TECHNOLOGY JAPAN, THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES Pub Date : 1900-01-01 DOI: 10.2322/ASTJ.14.59
Nobutaka Bando, Hideyuki Fuke, Yasuhiro Shoji, Philip von Doetinchem, C. J. Hailey, Shin-ichiro Sakai, Tatsuaki Hashimoto
{"title":"より戻しモータのみを用いた気球ゴンドラ方向制御とGAPS実験への適用;より戻しモータのみを用いた気球ゴンドラ方向制御とGAPS実験への適用;Direction Control of Balloon Gondola with Only Untwisting Motor and Application to GAPS Project","authors":"Nobutaka Bando, Hideyuki Fuke, Yasuhiro Shoji, Philip von Doetinchem, C. J. Hailey, Shin-ichiro Sakai, Tatsuaki Hashimoto","doi":"10.2322/ASTJ.14.59","DOIUrl":"https://doi.org/10.2322/ASTJ.14.59","url":null,"abstract":"","PeriodicalId":138366,"journal":{"name":"AEROSPACE TECHNOLOGY JAPAN, THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130931588","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
Risk Assessment of Orbital Debris Removal Using Electro-dynamic Tether 利用电动系绳清除轨道碎片的风险评估
AEROSPACE TECHNOLOGY JAPAN, THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES Pub Date : 1900-01-01 DOI: 10.2322/ASTJ.11.145
Y. Tsutsumi, H. Hirayama, T. Hanada
{"title":"Risk Assessment of Orbital Debris Removal Using Electro-dynamic Tether","authors":"Y. Tsutsumi, H. Hirayama, T. Hanada","doi":"10.2322/ASTJ.11.145","DOIUrl":"https://doi.org/10.2322/ASTJ.11.145","url":null,"abstract":"1957 年にスプートニク 1 号が打ち上げられて以降,宇宙 開発は著しい発展を遂げてきた.しかし,その一方でスペ ースデブリ(以下,デブリと呼ぶ)という負の財産も残し てきたといえる.デブリ数は年々増加傾向にあり,2007 年 の中国衛星破壊実験および 2009 年の米露通信衛星衝突事 故後にはさらなる増加が確認されている.高度 2000 km 以 下の低軌道においては,特に高度 700 kmから 1000 km と, 1400 km から 1500 km にデブリが多数存在している.デブ リの増加は,人工衛星や国際宇宙ステーションといった宇 宙開発の脅威となるため,早急な対策が望まれている.そ こで現在対策として,運用を終了した衛星やロケットを有 用な軌道域から移行する PMD(Post-mission Disposal)とい うデブリ低減策が推奨されており,低軌道においては 25 年以内に自然に落下する軌道への移行,静止軌道において はより高い墓場軌道への移行が推奨されている.しかしな がら,このような低減策だけではデブリの増加は抑制でき ©2012 日本航空宇宙学会 平成 24 年 4 月 2 日原稿受付 九州大学大学院工学府航空宇宙工学専攻 九州大学大学院工学研究院航空宇宙工学部門 国際宇宙天気科学・教育センター ず,今後も増え続ける一方であることが宇宙航空研究開発 機構(JAXA)と九州大学の研究 や NASA による研究 2,3) によって明らかにされている. 低軌道におけるデブリ除去効果について第 1 図に示す. 赤の実線はこれから打ち上げる衛星に対して PMD(成功率 90%)を実施した場合の軌道上物体数推移を示しているが, PMD を実施するだけではデブリの増加を抑止できないこ とがわかる.この事実は現況がすでに不安定であること, すなわち地球を周回する人工物体の衝突による自己増殖が 始まっていること,を意味する.一方,PMD に加え能動的 デブリ除去(ADR = Active Debris Removal)を実施した場 合(年間 2 個,または 5 個取り除く)は,緩やかな増加は 見られるものの,デブリ増加の抑止が確認できる.そのため, 今後のデブリ対策は低減だけでは不十分であり,積極的に デブリ除去を実施していく必要があると指摘されている.","PeriodicalId":138366,"journal":{"name":"AEROSPACE TECHNOLOGY JAPAN, THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES","volume":"116 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123075368","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
X帯民生GaN HEMTを用いた搭載用固体電力増幅器の動作条件によるRF特性と宇宙環境耐性評価;X帯民生GaN HEMTを用いた搭載用固体電力増幅器の動作条件によるRF特性と宇宙環境耐性評価;Evaluation of RF Characteristics Affected by Operational Conditions and Space Environmental Testing of X-band SSPA Using COTS GaN HEMT 基于X波段民用GaN HEMT的机载固体功率放大器工作条件的RF特性和空间环境耐受性评估;基于X波段民用GaN HEMT的机载固体功率放大器工作条件的RF特性和空间环境耐受性评估;Evaluation of RF Characteristics Affected by Operational Conditions and空间环境mental Testingof X-band SSPA Using COTS GaN HEMT
AEROSPACE TECHNOLOGY JAPAN, THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES Pub Date : 1900-01-01 DOI: 10.2322/ASTJ.12.1
Yuta Kobayashi, Z. Yamamoto, S. Kawasaki
{"title":"X帯民生GaN HEMTを用いた搭載用固体電力増幅器の動作条件によるRF特性と宇宙環境耐性評価;X帯民生GaN HEMTを用いた搭載用固体電力増幅器の動作条件によるRF特性と宇宙環境耐性評価;Evaluation of RF Characteristics Affected by Operational Conditions and Space Environmental Testing of X-band SSPA Using COTS GaN HEMT","authors":"Yuta Kobayashi, Z. Yamamoto, S. Kawasaki","doi":"10.2322/ASTJ.12.1","DOIUrl":"https://doi.org/10.2322/ASTJ.12.1","url":null,"abstract":"GaN HEMT has been expected to satisfy requirements being used in space as amplifying devices of future high-efficiency onboard SSPAs due to its excellent properties such as robustness in a harsh environment, applicability to high frequency and high power operation. However, in X-band, the most important frequency band for space communication at this moment, evaluation of GaN HEMT to prove the space usage has not been conducted yet because ensuring a steady supply of X-band GaN HEMT devices is still difficult due to current collapse phenomena. Therefore, in this research, evaluation of RF characteristics affected by operational conditions and space environmental testing of X-band HPA using COTS GaN HEMT was conducted to secure the space usage.","PeriodicalId":138366,"journal":{"name":"AEROSPACE TECHNOLOGY JAPAN, THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES","volume":"172 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121074576","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: 4
Multidisciplinary Design Optimization of Engine Layout for Supersonic Airliner 超音速客机发动机布局多学科设计优化
AEROSPACE TECHNOLOGY JAPAN, THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES Pub Date : 1900-01-01 DOI: 10.2322/ASTJ.14.67
A. Ueno, Yasushi Watanabe
{"title":"Multidisciplinary Design Optimization of Engine Layout for Supersonic Airliner","authors":"A. Ueno, Yasushi Watanabe","doi":"10.2322/ASTJ.14.67","DOIUrl":"https://doi.org/10.2322/ASTJ.14.67","url":null,"abstract":"The airframe/propulsion integration for supersonic airliners was studied considering three engine layouts (i.e., under-wing, over-wing, and side-body engines). In this study, the engine position was optimized for each layout from viewpoints of low-drag, low-boom, and high-range performances. This study revealed that the interference between nacelle shock wave and wing is important to achieve low-drag and low-boom, and that side-body engines realize the best compromise between them by setting engine so that the nacelle shock wave acts on the rear part of the wing. The engine position affects the inlet aerodynamic performance, which in turn affects the range performance. However, the side-body engine remains optimum, even when the range performance is taken into account.","PeriodicalId":138366,"journal":{"name":"AEROSPACE TECHNOLOGY JAPAN, THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES","volume":"68 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115949537","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
Power Taper Implementation for Large-Area Phased Array Antennas on Orbit using Subarrays with Gradually Increasing Number of Elements Method 基于渐增元子阵法的轨道大面积相控阵天线功率锥度实现
AEROSPACE TECHNOLOGY JAPAN, THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES Pub Date : 1900-01-01 DOI: 10.2322/astj.20.125
Shotaro Katano, Kentaro Maki, T. Mizuno
{"title":"Power Taper Implementation for Large-Area Phased Array Antennas on Orbit using Subarrays with Gradually Increasing Number of Elements Method","authors":"Shotaro Katano, Kentaro Maki, T. Mizuno","doi":"10.2322/astj.20.125","DOIUrl":"https://doi.org/10.2322/astj.20.125","url":null,"abstract":"","PeriodicalId":138366,"journal":{"name":"AEROSPACE TECHNOLOGY JAPAN, THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES","volume":"135 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132369106","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
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