Article(id=1322941442179609418, tenantId=1146029695717560320, journalId=1322258626896822465, issueId=1322941226537857309, articleNumber=null, orderNo=null, doi=10.13700/j.bh.1001-5965.2025.0468, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=research-article, receivedDate=1752422400000, receivedDateStr=2025-07-14, revisedDate=null, revisedDateStr=null, acceptedDate=1760630400000, acceptedDateStr=2025-10-17, onlineDate=1793343418879, onlineDateStr=2026-10-30, pubDate=1793376000000, pubDateStr=2026-10-31, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1793343418879, onlineIssueDateStr=2026-10-30, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1793343418879, creator=13701087609, updateTime=1793343418879, updator=13701087609, issue=Issue{id=1322941226537857309, tenantId=1146029695717560320, journalId=1322258626896822465, year='2026', volume='52', issue='10', pageStart='3237', pageEnd='3676', issueExtLink='null', onlineDate='null', pubDate='1793376000000', pubDateStr='2026-10-31', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=1, specialIssue=null, createTime=1793343367466, creator='13701087609', updateTime=1793344760378, updator='13701087609', preIssue=null, nextIssue=null, articleTotal=null, ext={EN=IssueExt(id=1322947068926505286, tenantId=1146029695717560320, journalId=1322258626896822465, issueId=1322941226537857309, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1322947068926505287, tenantId=1146029695717560320, journalId=1322258626896822465, issueId=1322941226537857309, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null, downloadFileDto=null}, startPage=3635, endPage=3646, ext={EN=ArticleExt(id=1322941442364158795, articleId=1322941442179609418, tenantId=1146029695717560320, journalId=1322258626896822465, language=EN, title=Phased orbit design for manned lunar landing mission with on-orbit refueling, columnId=null, journalTitle=Journal of Beijing University of Aeronautics and Astronautics, columnName=null, runingTitle=null, highlight=null, articleAbstract=

To address the conflict between the limited payload capacity of a single launch vehicle and the substantial deployment demands of large-scale target payloads, this paper employs a two-phase manned lunar landing mission architecture, where on-orbit refueling connects Earth ascent and space transfer. Mission scale analysis and calculations were performed for manned lunar landing utilizing on-orbit refueling. Dynamic models for the four main phases—launch, rendezvous, Earth-Moon transfer, and lunar landing—were established, and overall mission design simulation analysis was completed. A mass estimation method was employed to compare the total mission mass and the scale of each stage between the traditional mode and the on-orbit refueling mode. In order to define phase-specific limitations and develop a mass model that takes into account in-orbit evaporation losses of cryogenic propellant, a mission model covering the four phases of launch, rendezvous and docking, Earth-Moon transfer, and lunar landing was built. Subsequently, mission windows were calculated, and full-process orbital simulations were conducted to analyze trajectory parameters and propellant consumption for each phase. Genetic algorithms were used to optimize parameters for the lunar landing phase. Mass estimation results show that, compared to the thousands of tonnes launch mass required by the traditional mode, the total launch mass for the on-orbit refueling scheme is below 500 tonnes, and the space transfer stage mass is on the order of tens of tonnes. The full-process simulation findings provide crucial references for engineering design, further elucidating the propellant consumption for each stage of the on-orbit refueling strategy.

, authors=Qiling LI1, Peng SHI1, *, Yong CHEN2, authorsList=Qiling LI, Peng SHI, Yong CHEN, authorCompany=null, correspAuthors=Peng SHI, authorNote=null, correspAuthorsNote=
E-mail:
, copyrightStatement=Copyright © 2026 Journal of Beijing University of Aeronautics and Astronautics. All rights reserved., copyrightOwner=null, extLink=null, articleAbsUrl=null, sourceXml=null, magXml=null, pdfUrl=null, pdf=null, pdfFileSize=null, pdfExtLink=null, richHtmlUrl=null, mobilePdfUrl=null, reviewReport=null, pdfFirstPage=null, abstractGraph=null, abstractGraphContent=null, abstractVideo=null, citation=null, cebUrl=null, magXmlContent=null, mapNumber=null, fund=null), CN=ArticleExt(id=1322941447112110956, articleId=1322941442179609418, tenantId=1146029695717560320, journalId=1322258626896822465, language=CN, title=基于在轨加注的载人登月任务分段式轨道设计, columnId=null, journalTitle=北京航空航天大学学报, columnName=, runingTitle=null, highlight=null, articleAbstract=

针对单颗运载器运载能力有限但大规模目标载荷部署需求庞大的矛盾,采用由在轨加注衔接天地往返与空间转移的“两段式”载人登月任务模式,对使用在轨加注方法的载人登月任务的规模进行分析与计算,建立了发射段、交会段、地月段、落月段等4个主要过程的动力学模型,并完成任务的总体设计仿真分析。运用质量估算方法对比了传统模式与在轨加注模式下的任务总质量与各级规模;构建了包含发射、交会对接、地月转移和月面着陆等4个阶段的任务模型,明确了各阶段约束,并建立了考虑低温推进剂在轨蒸发损耗的质量模型;计算任务窗口并开展全流程轨道仿真,分析各阶段参数与推进剂消耗;采用遗传算法优化落月段参数。质量估算结果表明:相较于传统模式所需数千吨级起飞质量,在轨加注方案起飞总质量为500 t以下,空间转移级质量为数十吨级;全流程仿真结果进一步明确了在轨加注方案各阶段推进剂消耗量,为工程设计提供必要参考。

, authors=李其玲1, 师鹏1, *, 陈勇2, authorsList=李其玲, 师鹏, 陈勇, authorCompany=null, correspAuthors=师鹏, authorNote=null, correspAuthorsNote=
E-mail:
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tableContent=null), ArticleFig(id=1322941463595725763, tenantId=1146029695717560320, journalId=1322258626896822465, articleId=1322941442179609418, language=CN, label=图16, caption=时间和推力优化算法流程[19], figureFileSmall=cdxpiAzANST1F2Fv/UGFUA==, figureFileBig=3pOQbR+Y0/1uAf7Rr7Zjeg==, tableContent=null), ArticleFig(id=1322941463688000452, tenantId=1146029695717560320, journalId=1322258626896822465, articleId=1322941442179609418, language=EN, label=Table 1, caption=Structural mass database, figureFileSmall=null, figureFileBig=null, tableContent=
参数数值/t
方案1火箭结构质量30
方案2火箭结构质量130
载人飞船结构质量8
载人飞船返回舱结构质量2
月球着陆器结构质量4.2
空间转移运载器结构质量8
), ArticleFig(id=1322941463939658693, tenantId=1146029695717560320, journalId=1322258626896822465, articleId=1322941442179609418, language=CN, label=表1, caption=

结构质量数据库

, figureFileSmall=null, figureFileBig=null, tableContent=
参数数值/t
方案1火箭结构质量30
方案2火箭结构质量130
载人飞船结构质量8
载人飞船返回舱结构质量2
月球着陆器结构质量4.2
空间转移运载器结构质量8
), ArticleFig(id=1322941464023544774, tenantId=1146029695717560320, journalId=1322258626896822465, articleId=1322941442179609418, language=EN, label=Table 2, caption=Mission profile and velocity increment requirements for Solution 1, figureFileSmall=null, figureFileBig=null, tableContent=
序号任务阶段航天器速度增量/(km·s−1)动力来源
1地面发射运载火箭1、载人飞船10.00运载火箭1
2LEO载人飞船0无
3LEO→加注站载人飞船0.31载人飞船推进舱
4加注站月球着陆器、空间转移运载器0无
5加注站→LO(进入转移轨道)月球着陆器、空间转移运载器3.08空间转移运载器
6加注站→LO(制动进入LO)月球着陆器、空间转移运载器3.48空间转移运载器
7LO→月面月球着陆器2.10月球着陆器
8月面→LO月球着陆器2.00月球着陆器
9LO月球着陆器、空间转移运载器0无
10LO→加注站月球着陆器、空间转移运载器0.65空间转移运载器
11加注站载人飞船0无
12再入返回地球载人飞船返回舱0.50返回舱气动减速
), ArticleFig(id=1322941464120013768, tenantId=1146029695717560320, journalId=1322258626896822465, articleId=1322941442179609418, language=CN, label=表2, caption=

方案1任务剖面及速度增量需求

, figureFileSmall=null, figureFileBig=null, tableContent=
序号任务阶段航天器速度增量/(km·s−1)动力来源
1地面发射运载火箭1、载人飞船10.00运载火箭1
2LEO载人飞船0无
3LEO→加注站载人飞船0.31载人飞船推进舱
4加注站月球着陆器、空间转移运载器0无
5加注站→LO(进入转移轨道)月球着陆器、空间转移运载器3.08空间转移运载器
6加注站→LO(制动进入LO)月球着陆器、空间转移运载器3.48空间转移运载器
7LO→月面月球着陆器2.10月球着陆器
8月面→LO月球着陆器2.00月球着陆器
9LO月球着陆器、空间转移运载器0无
10LO→加注站月球着陆器、空间转移运载器0.65空间转移运载器
11加注站载人飞船0无
12再入返回地球载人飞船返回舱0.50返回舱气动减速
), ArticleFig(id=1322941464501695434, tenantId=1146029695717560320, journalId=1322258626896822465, articleId=1322941442179609418, language=EN, label=Table 3, caption=Mission profile and velocity increment requirements for Solution 2, figureFileSmall=null, figureFileBig=null, tableContent=
序号任务阶段包含航天器速度增量/(km·s−1)动力来源
1地面发射运载火箭2、载人飞船10.00运载火箭2
2LEO运载火箭2、载人飞船0无
3LEO→LO(进入转移轨道)运载火箭2、载人飞船3.13运载火箭2
4LEO→LO(制动进入LO)载人飞船3.48运载火箭2
5LO月球着陆器、载人飞船0无
6LO→月面月球着陆器2.10月球着陆器
7月面→LO月球着陆器2.00月球着陆器
8LO月球着陆器、载人飞船0无
9LO→LEO载人飞船0.65载人飞船推进舱
10再入返回地球载人飞船返回舱0.50返回舱气动减速
), ArticleFig(id=1322941464711410636, tenantId=1146029695717560320, journalId=1322258626896822465, articleId=1322941442179609418, language=CN, label=表3, caption=

方案2任务剖面及速度增量需求

, figureFileSmall=null, figureFileBig=null, tableContent=
序号任务阶段包含航天器速度增量/(km·s−1)动力来源
1地面发射运载火箭2、载人飞船10.00运载火箭2
2LEO运载火箭2、载人飞船0无
3LEO→LO(进入转移轨道)运载火箭2、载人飞船3.13运载火箭2
4LEO→LO(制动进入LO)载人飞船3.48运载火箭2
5LO月球着陆器、载人飞船0无
6LO→月面月球着陆器2.10月球着陆器
7月面→LO月球着陆器2.00月球着陆器
8LO月球着陆器、载人飞船0无
9LO→LEO载人飞船0.65载人飞船推进舱
10再入返回地球载人飞船返回舱0.50返回舱气动减速
), ArticleFig(id=1322941464795296717, tenantId=1146029695717560320, journalId=1322258626896822465, articleId=1322941442179609418, language=EN, label=Table 4, caption=Mass scale comparison for both solutions, figureFileSmall=null, figureFileBig=null, tableContent=
方案质量规模/t
基于在轨加注的载人登月任务方案486.7
基于一次对接的载人登月任务方案3 906.7
), ArticleFig(id=1322941464895960014, tenantId=1146029695717560320, journalId=1322258626896822465, articleId=1322941442179609418, language=CN, label=表4, caption=

2种方案所需质量规模对比

, figureFileSmall=null, figureFileBig=null, tableContent=
方案质量规模/t
基于在轨加注的载人登月任务方案486.7
基于一次对接的载人登月任务方案3 906.7
), ArticleFig(id=1322941465122452433, tenantId=1146029695717560320, journalId=1322258626896822465, articleId=1322941442179609418, language=EN, label=Table 5, caption=Earth-Moon transfer window, figureFileSmall=null, figureFileBig=null, tableContent=
变轨时刻转移时间/s捕获时相对月球的速度/(km·s−1)
2025-05-04T01:00:00286 3001.050
2025-05-04T18:00:00297 7001.006
2025-05-04T21:00:00248 6001.127
2025-05-05T14:00:00264 3001.056
2025-05-06T10:00:00245 6001.093
2025-05-07T06:00:00248 6000.949
2025-05-19T04:00:00213 9000.890
2025-05-31T15:00:00271 6001.054
), ArticleFig(id=1322941465202144209, tenantId=1146029695717560320, journalId=1322258626896822465, articleId=1322941442179609418, language=CN, label=表5, caption=

地月转移时间窗口

, figureFileSmall=null, figureFileBig=null, tableContent=
变轨时刻转移时间/s捕获时相对月球的速度/(km·s−1)
2025-05-04T01:00:00286 3001.050
2025-05-04T18:00:00297 7001.006
2025-05-04T21:00:00248 6001.127
2025-05-05T14:00:00264 3001.056
2025-05-06T10:00:00245 6001.093
2025-05-07T06:00:00248 6000.949
2025-05-19T04:00:00213 9000.890
2025-05-31T15:00:00271 6001.054
), ArticleFig(id=1322941465260864466, tenantId=1146029695717560320, journalId=1322258626896822465, articleId=1322941442179609418, language=EN, label=Table 6, caption=Orbital insertion parameters for manned spacecraft, figureFileSmall=null, figureFileBig=null, tableContent=
参数数值
飞行时间/s469.79
关机点速度/(km·s−1)7.82
关机点高度/km211.04
), ArticleFig(id=1322941465550271444, tenantId=1146029695717560320, journalId=1322258626896822465, articleId=1322941442179609418, language=CN, label=表6, caption=

载人飞船入轨参数

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参数数值
飞行时间/s469.79
关机点速度/(km·s−1)7.82
关机点高度/km211.04
), ArticleFig(id=1322941465621574613, tenantId=1146029695717560320, journalId=1322258626896822465, articleId=1322941442179609418, language=EN, label=Table 7, caption=Maneuver epoch and velocity increment, figureFileSmall=null, figureFileBig=null, tableContent=
次数变轨距离上次用时/s速度增量/(m·s−1)
第1次5 699.446.11
第2次3 896.31−316.82
第3次18 576.35199.51
第4次2 567.61194.58
), ArticleFig(id=1322941467316073431, tenantId=1146029695717560320, journalId=1322258626896822465, articleId=1322941442179609418, language=CN, label=表7, caption=

变轨时刻及速度增量

, figureFileSmall=null, figureFileBig=null, tableContent=
次数变轨距离上次用时/s速度增量/(m·s−1)
第1次5 699.446.11
第2次3 896.31−316.82
第3次18 576.35199.51
第4次2 567.61194.58
), ArticleFig(id=1322941467412542425, tenantId=1146029695717560320, journalId=1322258626896822465, articleId=1322941442179609418, language=EN, label=Table 8, caption=Post-docking orbital elements of spacecraft, figureFileSmall=null, figureFileBig=null, tableContent=
轨道要素取值
升交点赤经/(°)292.41
轨道倾角/(°)41.37
近地点幅角/(°)107.50
半长轴/km6 755.08
偏心率0
平近点角/(°)280.56
), ArticleFig(id=1322941467488039899, tenantId=1146029695717560320, journalId=1322258626896822465, articleId=1322941442179609418, language=CN, label=表8, caption=

交会对接后航天器的轨道根数

, figureFileSmall=null, figureFileBig=null, tableContent=
轨道要素取值
升交点赤经/(°)292.41
轨道倾角/(°)41.37
近地点幅角/(°)107.50
半长轴/km6 755.08
偏心率0
平近点角/(°)280.56
), ArticleFig(id=1322941467576120286, tenantId=1146029695717560320, journalId=1322258626896822465, articleId=1322941442179609418, language=EN, label=Table 9, caption=Phase-specific parameters during lunar landing sequence, figureFileSmall=null, figureFileBig=null, tableContent=
落月段运动阶段高度/km推力大小/N阶段耗时/s推进剂消耗/kg剩余质量/kg
环月降轨段200×15(椭圆轨道)
动力下降段15.000~3.00045 000342.03 469.47 172.4
快速调整段3.000~2.40032 80019.3143.57 028.9
接近下降段2.400~0.05072 76257.1149.66 879.2
缓速下降段0.050~0.00228 15610.025.36 853.9
), ArticleFig(id=1322941467685172191, tenantId=1146029695717560320, journalId=1322258626896822465, articleId=1322941442179609418, language=CN, label=表9, caption=

落月过程各阶段参数

, figureFileSmall=null, figureFileBig=null, tableContent=
落月段运动阶段高度/km推力大小/N阶段耗时/s推进剂消耗/kg剩余质量/kg
环月降轨段200×15(椭圆轨道)
动力下降段15.000~3.00045 000342.03 469.47 172.4
快速调整段3.000~2.40032 80019.3143.57 028.9
接近下降段2.400~0.05072 76257.1149.66 879.2
缓速下降段0.050~0.00228 15610.025.36 853.9
), ArticleFig(id=1322941467769058272, tenantId=1146029695717560320, journalId=1322258626896822465, articleId=1322941442179609418, language=EN, label=Table 10, caption=Mission phase node summary, figureFileSmall=null, figureFileBig=null, tableContent=
序号任务阶段时间节点推进剂消耗/kg动力来源
1地面发射2025-05-03T10:30:39430 372.4运载火箭1
2LEO→加注站2025-05-03T10:38:291262.2载人飞船推进舱
3与加注站交会对接2025-05-03T19:10:49
4进入地月轨道2025-05-04T01:00:0058 309.4空间转移运载器
5制动进入LO2025-05-07T08:31:4017 611.5空间转移运载器
6进入落月轨道2025-05-07T09:31:37359.6空间转移运载器
7LO→月面2025-05-07T09:38:453 762.6月球着陆器
), ArticleFig(id=1322941467852944355, tenantId=1146029695717560320, journalId=1322258626896822465, articleId=1322941442179609418, language=CN, label=表10, caption=

任务节点汇总

, figureFileSmall=null, figureFileBig=null, tableContent=
序号任务阶段时间节点推进剂消耗/kg动力来源
1地面发射2025-05-03T10:30:39430 372.4运载火箭1
2LEO→加注站2025-05-03T10:38:291262.2载人飞船推进舱
3与加注站交会对接2025-05-03T19:10:49
4进入地月轨道2025-05-04T01:00:0058 309.4空间转移运载器
5制动进入LO2025-05-07T08:31:4017 611.5空间转移运载器
6进入落月轨道2025-05-07T09:31:37359.6空间转移运载器
7LO→月面2025-05-07T09:38:453 762.6月球着陆器
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基于在轨加注的载人登月任务分段式轨道设计
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李其玲 1 , 师鹏 1, * , 陈勇 2
北京航空航天大学学报 | 2026,52(10): 3635-3646
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北京航空航天大学学报 | 2026 , 52 (10) : 3635 -3646
基于在轨加注的载人登月任务分段式轨道设计
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李其玲1, 师鹏1, * , 陈勇2
作者信息
  • 1北京航空航天大学 宇航学院,北京 102206
  • 2成都流体动力创新中心,成都 610031
通讯作者:
Phased orbit design for manned lunar landing mission with on-orbit refueling
Qiling LI1, Peng SHI1, * , Yong CHEN2
Affiliations
  • 1School of Astronautics,Beihang University,Beijing 102206,China
  • 2Chengdu Fluid Dynamics Innovation Center,Chengdu 610031,China
  • Corresponding Author:
出版时间: 2026-10-31 doi: 10.13700/j.bh.1001-5965.2025.0468
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针对单颗运载器运载能力有限但大规模目标载荷部署需求庞大的矛盾,采用由在轨加注衔接天地往返与空间转移的“两段式”载人登月任务模式,对使用在轨加注方法的载人登月任务的规模进行分析与计算,建立了发射段、交会段、地月段、落月段等4个主要过程的动力学模型,并完成任务的总体设计仿真分析。运用质量估算方法对比了传统模式与在轨加注模式下的任务总质量与各级规模;构建了包含发射、交会对接、地月转移和月面着陆等4个阶段的任务模型,明确了各阶段约束,并建立了考虑低温推进剂在轨蒸发损耗的质量模型;计算任务窗口并开展全流程轨道仿真,分析各阶段参数与推进剂消耗;采用遗传算法优化落月段参数。质量估算结果表明:相较于传统模式所需数千吨级起飞质量,在轨加注方案起飞总质量为500 t以下,空间转移级质量为数十吨级;全流程仿真结果进一步明确了在轨加注方案各阶段推进剂消耗量,为工程设计提供必要参考。

载人登月  /  在轨加注  /  推进剂  /  航天运输  /  质量规模

To address the conflict between the limited payload capacity of a single launch vehicle and the substantial deployment demands of large-scale target payloads, this paper employs a two-phase manned lunar landing mission architecture, where on-orbit refueling connects Earth ascent and space transfer. Mission scale analysis and calculations were performed for manned lunar landing utilizing on-orbit refueling. Dynamic models for the four main phases—launch, rendezvous, Earth-Moon transfer, and lunar landing—were established, and overall mission design simulation analysis was completed. A mass estimation method was employed to compare the total mission mass and the scale of each stage between the traditional mode and the on-orbit refueling mode. In order to define phase-specific limitations and develop a mass model that takes into account in-orbit evaporation losses of cryogenic propellant, a mission model covering the four phases of launch, rendezvous and docking, Earth-Moon transfer, and lunar landing was built. Subsequently, mission windows were calculated, and full-process orbital simulations were conducted to analyze trajectory parameters and propellant consumption for each phase. Genetic algorithms were used to optimize parameters for the lunar landing phase. Mass estimation results show that, compared to the thousands of tonnes launch mass required by the traditional mode, the total launch mass for the on-orbit refueling scheme is below 500 tonnes, and the space transfer stage mass is on the order of tens of tonnes. The full-process simulation findings provide crucial references for engineering design, further elucidating the propellant consumption for each stage of the on-orbit refueling strategy.

manned lunar landing  /  on-orbit refueling  /  propellant  /  space transportation  /  mass scale
李其玲, 师鹏, 陈勇. 基于在轨加注的载人登月任务分段式轨道设计. 北京航空航天大学学报, 2026 , 52 (10) : 3635 -3646 . DOI: 10.13700/j.bh.1001-5965.2025.0468
Qiling LI, Peng SHI, Yong CHEN. Phased orbit design for manned lunar landing mission with on-orbit refueling[J]. Journal of Beijing University of Aeronautics and Astronautics, 2026 , 52 (10) : 3635 -3646 . DOI: 10.13700/j.bh.1001-5965.2025.0468
以探月为代表的未来航天任务,具有规模大、距离远的特点,对航天运输系统的运载能力提出了更高的要求。现有载人登月轨道设计方法存在两大局限:一是传统“一站式”运输模式需携带全部推进剂入轨,导致发射规模达数千吨级;二是航天器设计需同时兼顾大气层穿越与深空转移功能,制约运输效率提升[1-2]。
针对上述矛盾,有研究者提出应用在轨推进剂仓库(即“太空加注站”)的太空运输架构,由低成本火箭向加注站输送推进剂,目标航天器抵达在轨加注站后实现推进剂补给。基于在轨加注,航天器获得燃料补给后,可以直接搭载有效载荷从空间轨道出发,实现天地往返与空间转移运输两大过程“解耦”[3-10]。
然而,现有研究存在2点关键不足:①多将轨道设计与加注站部署解耦,缺乏轨道参数(如地月转移窗口)与加注站位置(如近地轨道(low Earth orbit, LEO))的联合分析,导致加注效率与轨道经济性难以协同;②传统轨道设计以“一站式”运输为基础,未充分考虑在轨加注带来的多阶段任务拆分特性,模型约束与实际任务需求匹配度低。
基于上述背景,本文进行了以下工作:①采用“两段式”载人登月任务模式,以LEO加注站为加注节点,实现天地往返与空间转移的解耦;②建立耦合加注站位置的发射、交会、地月、落月4段动力学模型,明确各阶段速度增量、推力约束。
考虑到构建在轨加注站的成本,参考汪小卫等[11-13]提出的“接力式”地月空间航天运输模式,采用由在轨加注衔接天地往返与空间转移“两段式”的载人登月任务飞行模式:空间转移运输系统长期停泊于轨道,执行任务前前往加注站进行推进剂在轨加注并等待空间转移窗口;月球着陆器发射至加注站,与此同时,载人飞船也由运载火箭搭载发射,将航天员送至加注站;航天员转移至月球着陆器后,由空间转移运输系统送至环月轨道(lunar orbit, LO);航天员完成月表勘测任务后,乘坐月球着陆器返回LO,由空间转移运输系统将月球着陆器送至加注站,随后航天员换乘载人飞船的返回舱返回地球。上述过程如图1所示。
为评估在轨加注方案的优势,定义2种任务模式进行对比分析:方案1为在轨加注模式,即基于LEO加注站的“两段式”任务架构;方案2为传统模式,即基于近月轨道一次对接的传统任务模式。
采用模块化质量规模估算方法进行质量规模估算,主要包括建立质量数据库、确定任务过程、求解质量规模三大步骤[14]。具体计算过程如下:
1) 建立质量数据库。方案1和方案2中的航天器包括运载火箭、载人飞船、月球着陆器、空间转移运载器。方案1中,运载火箭将载人飞船和月球着陆器分别发射至LEO,地月转移所需速度增量由空间转移运载器提供,月球着陆和起飞由月球着陆器推进系统支持;方案2中,运载火箭将载人飞船和月球着陆器分别送达LO,航天器在月球轨道完成组装。由此可建立结构质量数据库,如表1所示。
2) 确定任务过程。根据航天器在轨飞行速度确定速度增量,2种方案下的任务方案及速度增量分别如表2和表3所示(仅展示航天员参与的飞行阶段)。方案1任务阶段包括:地面发射、LEO、LEO→加注站、加注站、加注站→LO(进入转移轨道)、加注站→LO(制动进入LO)、LO→月面、月面→LO、LO、LO→加注站、加注站、再入返回地球12个阶段。方案2任务阶段包括:地面发射、LEO、LEO→LO(进入转移轨道)、LEO→LO(制动进入LO)、LO、LO→月面、月面→LO、LO、LO→LEO、再入返回地球10个阶段。由于加注站的存在,方案1避免了使用重型火箭从LEO直接发射到近月轨道,其所需的速度增量需求明显小于方案2,从而显著减小质量规模。
3) 求解质量规模。由各任务方案最后一个任务阶段的质量开始,根据齐奥尔科夫斯基公式和所抛弃的航天器质量可以依次推导上一阶段系统的总质量,进而获得任务开始时系统的质量规模。
假设整个飞行过程共有n个阶段,在第i个阶段中(2≤i≤n),速度增量为Δvi,抛弃的质量为Δmi,第i阶段结束时质量为mi,则第i−1阶段结束时的质量为[15]
$ {m}_{i-1}=\left({m}_{i}+\Delta {m}_{i}\right) {e}^{\tfrac{\Delta {v}_{i}}{{I}_{\text{sp}} g}} $
式中:Isp为发动机比冲;g为重力加速度;e为轨道偏心率。
由此求得2种方案所需的系统质量规模对比如表4所示。基于在轨加注的载人登月任务方案系统质量规模显著低于基于近月轨道一次对接的载人登月任务方案,充分展现了基于在轨加注的载人登月任务方案的优势。
LEO加注轨道飞行任务包括发射段、交会段、地月段、落月段,飞行时序如图2所示。发射段主要确定火箭的飞行时序、质量参数及航天器从地面发射进入LEO的入轨参数;交会段需实现航天器与LEO加注站的交会对接,主要确定变轨时刻、速度增量和轨道根数;地月段为空间转移运输系统与月球着陆器组合体的地月转移轨道,主要确定任务窗口、转移时间和捕获参数;落月段主要确定推力大小、阶段耗时和推进剂消耗量参数。
发射段考虑两级火箭发动机、助推器的作用过程,将飞行阶段分为5个时序。在发射坐标系下建立火箭飞行的动力学和运动学微分方程,采用四阶龙格库塔法进行数值积分,即可得到火箭发射段的入轨参数。发射段的主要模型如下:
1) 飞行时序。
① t0时刻:火箭助推器和一级火箭发动机开始工作。
② t1时刻:火箭助推器分离,一级火箭发动机继续工作。
③ t2时刻:一级火箭发动机分离,二级火箭发动机工作。
④ t2+t3:二级火箭主机发动机关机,游机继续工作。
⑤ t2+t4:二级火箭游机发动机关机,完成器箭分离,有效载荷入轨。
2) 质量模型。
根据火箭的参数有2个子级,助推器质量为
$ \begin{cases}{m}_{\text{o}2}=\dfrac{{m}_{\text{o}1}}{{e}_{1}}\\{m}_{\text{o}3}=\dfrac{{m}_{\text{o}1}}{{e}_{2}}\end{cases} $
式中:${m}_{\text{o}1} $为第一级火箭质量;${m}_{\text{o}2} $为第二级火箭质量;${m}_{\text{o}3} $为助推器质量;e1为第一级和第二级火箭质量比;e2为第一级火箭和助推器质量比;e1、e2均为无量纲。
由于火箭发动机喷射推进剂,火箭的质量随时间变化,其微分方程为
$ \dot{m}=-{\dot{m}}_{\text{f}} $
式中:$ {\dot{m}}_{\text{f}} $为推进剂的质量流量,kg/s。
假设火箭飞行各阶段燃料质量占燃料所在级的总质量的比值为定值,则火箭各级累计消耗燃料质量为
$ \begin{cases}{m}_{\text{f}1}={m}_{\text{o}1} \dfrac{{m}_{\text{f}1}}{{m}_{\text{o}1}}\\{m}_{\text{f}2}=\dfrac{{m}_{\text{o}1}}{{e}_{1}}\cdot \dfrac{{m}_{\text{f}2}}{{m}_{\text{o}2}}\\{m}_{\text{f}3}=\dfrac{{m}_{\text{o}1}}{{e}_{2}}\cdot \dfrac{{m}_{\text{f}3}}{{m}_{\text{o}3}}\end{cases} $
式中:mf1为0~t2时间内消耗的第一级燃料的质量;mf2为t2~t3时间内消耗的第二级燃料的质量;mf3为0~t1时间内消耗的助推器燃料的质量。
同步考虑助推器、一级、整流罩等结构分离,则火箭在飞行过程中的质量为
$ m = \begin{cases}{m}_{\text{o}1}\left(1+\dfrac{1}{{e}_{1}}+\dfrac{1}{{e}_{2}}\right)-({\dot{m}}_{\text{f}1}+{\dot{m}}_{\text{f}3})t+{m}_{\text{s}}+{m}_{\text{p}}\\\qquad\qquad\qquad\qquad\qquad\qquad\qquad\quad\;\;\; 0 \lt t \lt {t}_{1}\\{m}_{\text{o}1}\left(1+\dfrac{1}{{e}_{1}}\right)-{\dot{m}}_{\text{f}1}t+{m}_{\text{s}}+{m}_{\text{p}}\qquad\qquad {t}_{1} \lt t \lt {t}_{2}\\\dfrac{{m}_{\text{o}1}}{{e}_{1}}-({\dot{m}}_{\text{f}21}+{\dot{m}}_{\text{f}22})(t-{t}_{2})+{m}_{\text{p}}\qquad\;\; {t}_{2} \lt t \lt {t}_{2}+{t}_{3}\\\dfrac{{m}_{\text{o}1}}{{e}_{1}}+{m}_{\text{p}}-{\dot{m}}_{\text{f}21}{t}_{3}-{\dot{m}}_{\text{f}22}(t-{t}_{2})\quad{t}_{2}+{t}_{3} \lt t \lt {t}_{2}+{t}_{4}\\\dfrac{{m}_{\text{o}1}}{{e}_{1}}+{m}_{\text{p}}-{m}_{\text{f}2}\qquad\qquad\qquad\qquad\qquad t \gt {t}_{2}+{t}_{4}\end{cases} $
式中:ms为整流罩、逃逸塔等箭体结构质量;mp为有效载荷质量。为方便计算,假设一级结构分离后,整流罩、逃逸塔等同时分离。
对应时刻有
$ \begin{cases}{t}_{1}=\dfrac{{m}_{\text{f}3}}{{\dot{m}}_{\text{f}3}}\\{t}_{2}=\dfrac{{m}_{\text{f}1}}{{\dot{m}}_{\text{f}1}}\\{t}_{3}=C\\{t}_{4}=\dfrac{{m}_{\text{f}2}-{\dot{m}}_{\text{f}21}{t}_{3}}{{\dot{m}}_{\text{f}22}}\end{cases} $
3) 动力学及运动学模型。在发射坐标系下建立火箭飞行的动力学和运动学微分方程如下。
动力学方程:
$ \begin{cases}\dfrac{\text{d}{v}_{x}}{\text{d}t}=\dfrac{P}{m}\cos \varphi \cos \psi +\dfrac{D}{m}\cdot \dfrac{{v}_{x}}{v}-\dfrac{x}{r}g+2({\omega }_{x}{v}_{y}-{\omega }_{y}{v}_{{\textit{z}}})\\\dfrac{\text{d}{v}_{y}}{\text{d}t}=\dfrac{P}{m}\sin \varphi \cos \psi +\dfrac{D}{m}\cdot \dfrac{{v}_{x}}{v}-\dfrac{{R}_{0}+y}{r}g+2({\omega }_{x}{v}_{{\textit{z}}}-{\omega }_{{\textit{z}}}{v}_{x})\\\dfrac{\text{d}{v}_{{\textit{z}}}}{\text{d}t}=-\dfrac{P}{m}\sin \psi +\dfrac{D}{m}\cdot \dfrac{{v}_{x}}{v}-\dfrac{{\textit{z}}}{r}g+2({\omega }_{y}{v}_{x}-{\omega }_{x}{v}_{y})\end{cases} $
式中:P为火箭发动机推力;R0为发射点至地心的距离,取地球参考半径;D为气动阻力;r为月球着陆器质心到月心的距离;vx、vy、vz分别为飞行器速度在坐标系x、y、z轴的分量;φ为俯仰角,火箭纵轴与发射坐标系Oxy水平面的夹角;ψ为偏航角,火箭纵轴在发射坐标系Oxy平面的投影与Ox轴的夹角;ωx、ωy、ωz分别为地球自转角速度矢量在发射坐标系x、y、z轴的分量。
运动学方程:
$ \begin{cases}\dfrac{\text{d}x}{\text{d}t}={v}_{x}\\\dfrac{\text{d}y}{\text{d}t}={v}_{y}\\\dfrac{\text{d}{\textit{z}}}{\text{d}t}={v}_{{\textit{z}}}\end{cases} $
入轨后,载人飞船与月球着陆器需进行自主变轨,与加注站进行交会对接。由于动力学过程类似,故仅考虑载人飞船的情况。采用近圆轨道的变轨方式进行轨道机动,变轨过程设计如下。
1) 第1次变轨。由于变轨前后角度改变量是小量,变轨的作用点是载人飞船和加注站轨道的交点,所需速度增量Δv1与角度改变量δ(即轨道平面夹角)和当地轨道速度vorb成正比,即Δv1≈vorbδ,方向与当地轨道速度垂直,作用点纬度幅角为u1。解球面三角形:
$ \begin{cases}\cos {i}_{2}=\cos {i}_{1}\cos \delta -\sin {{i}}_{1}\sin \delta \cos {u}_{1}\\\sin ({\mathit{\Omega }}_{2}-{\mathit{\Omega }}_{1})=\dfrac{\sin \delta \sin {u}_{1}}{\sin {{i}}_{2}}\end{cases} $
式中:i为轨道倾角;δ为轨道平面夹角;Ω为升交点赤经。
代入参数解得u1与δ,确定第1次变轨点。在该变轨点,Δv1的方向沿轨道平面动量矩相反方向。距离初始时刻经过时间:
$ \Delta {t}_{1}=\frac{\Delta M_1}{{n}_{\text{MS}}} $
式中:nMS为载人飞船在当前轨道上的平均角速度;M为平近点角。
第1次变轨后,载人飞船轨道的近地点幅角发生改变:
$ \begin{split}& \Delta \omega =\frac{2\sin \theta }{ev}\Delta {v}_{1t}-\frac{a(1+{e}^{2})-r}{{e}^{2}av}\Delta {v}_{1m}-\\&\qquad \frac{r\sin u}{\sqrt{\mu p}\tan i}\Delta {v}_{1h}=-\frac{r\sin u}{\sqrt{\mu p}\tan {i}}\Delta {v}_{1}\end{split} $
式中:θ为真近点角;μ为地球引力常数;p为椭圆轨道半通径;a为轨道半长轴;下标t表示椭圆轨道切向,m表示椭圆轨道法向,h表示垂直于轨道平面方向。
2) 第2次变轨。在近地点减速将载人飞船运行轨道变成圆轨道。
近地点的速度:
$ \begin{cases}{r}_{\text{a}}=\dfrac{p}{1-e}\\{r}_{\text{p}}=\dfrac{p}{1+e}\\{v}_{\text{p}}=\sqrt{\dfrac{2\mu {r}_{\text{a}}}{{r}_{\text{p}}({r}_{\text{a}}+{r}_{\text{p}})}}\end{cases} $
圆轨道速度:
$ {v}_{2}=\sqrt{\frac{\mu }{{r}_{\text{p}}}} $
第2次变轨速度增量:
$ \Delta {v}_{2}={v}_{2}-{v}_{\text{p}} $
距离第1次变轨经过时间:
$ \Delta {t}_{2}=\frac{\Delta {M}_{2}}{{n}_{\text{MS}}} $
第2次变轨后载人飞船角速度发生改变:
$ {\omega }_{\text{MS}}=\sqrt{\frac{\mu }{{r}_{\text{p}}^{3}}} $
式中:ra、rp分别为椭圆轨道远地点半径、近地点半径;v2为第2次变轨后圆轨道速度;vp为椭圆轨道近地点速度。
3) 第3次变轨。采用霍曼转移轨道,实现载人飞船和加注站的交会对接。第3次变轨是在过渡椭圆轨道的近地点加速,使载人飞船进入过渡椭圆轨道。
霍曼变轨的提前角Θ:
$ \mathit{\Theta }={\text{π}} \left[1-{\left(\frac{{r}_{1}+{r}_{2}}{2{r}_{2}}\right)}^{\tfrac{3}{2}}\right] $
故等待时间为
$ {\Delta }{t}_{3}=\frac{{\Delta }\theta -\mathit{\Theta }}{{n}_{\text{MS}}-{n}_{\text{CSS}}} $
式中:Δθ为初始相位角差;nCSS为空间中在当前轨道上的平均角速度。
在过渡椭圆近地点处的速度增量:
$ \Delta {v}_{3}=\sqrt{\frac{2\mu {r}_{2}}{{r}_{1}({r}_{1}+{r}_{2})}}-\sqrt{\frac{\mu }{{r}_{1}}} $
4) 第4次变轨。第4次变轨是在过渡椭圆轨道的远地点减速使载人飞船进入加注站的圆轨道,与加注站相遇,完成对接。
转移时间为过渡椭圆轨道的半周期:
$ \Delta {t}_{4}={\text{π}} \sqrt{\frac{{({{r}_{1}}+{{r}_{2}})}^{3}}{8\mu }} $
在过渡椭圆远地点处的速度增量:
$ \Delta {v}_{4}=\sqrt{\frac{\mu }{{r}_{2}}}-\sqrt{\frac{2\mu {r}_{1}}{{r}_{2}({r}_{1}+{r}_{2})}} $
地月段基于月球影响球模型建立月球着陆器-空间转移运输系统的运动模型,主要模型如下[16]。
1) 飞行时序。
① t0时刻:月球着陆器-空间转移运输系统组合体从加注站出发,进入地月转移轨道的入轨时刻。
② t1时刻:月球着陆器-空间转移运输系统组合体转移至月球影响球的入口时刻。
③ t2时刻:到达地月影响球区域后,减速抵达近月轨道的时刻。
2) 质量模型。根据地月转移-月球着陆的飞行阶段,飞行器在运动过程中的质量变化为
$ {m}_{\mathrm{sc}}=\begin{cases}{m}_{\text{sL}}+{m}_{\text{sT}}+{m}_{\text{p}0}\qquad\qquad\qquad\qquad\qquad\quad t={t}_{0}\\{m}_{\text{sL}}+{m}_{\text{sT}}+{m}_{\text{p}0} (1-\eta )^{\tfrac{t-{t}_{0}}{86\;400}}\qquad\qquad\quad {t}_{0} \lt t \lt {t}_{1}\\{m}_{\text{sL}}+{m}_{\text{sT}}+{m}_{\text{p}1}\qquad\qquad\qquad\qquad\qquad\quad\, t={t}_{1}\\{m}_{\text{sL}}+{m}_{\text{sT}}+{m}_{\text{p}1} (1-\eta )^{\tfrac{t-{t}_{1}}{86\;400}}\qquad\qquad\quad {t}_{1} \lt t \lt {t}_{2}\\{m}_{\text{sL}}+{m}_{\text{sT}}+{m}_{\text{p}2}\qquad\qquad\qquad\qquad\qquad\quad\, t={t}_{2}\\{m}_{\text{sL}}+{m}_{\text{pL}} (1-\eta )^{\tfrac{t-{t}_{0}}{86\;400}}\qquad\qquad\qquad\qquad\;\;\;\; t \gt {t}_{2}\end{cases} $
式中:η为推进剂的日蒸发率;下标L、T分别代表月球着陆器、转移运输系统,s、p分别代表结构、推进剂。
式(22)还涉及时刻t0、t1、t2时的推进剂质量mpi,计算式为
$ \begin{cases}{m}_{\text{p}0}={m}_{\text{pL}}+{m}_{\text{pT}}-\Delta {m}_{0}\\{m}_{\text{p}1}=({m}_{\text{pL}}+{m}_{\text{pT}}-\Delta {m}_{0}) {(1-\eta )}^{\tfrac{{t}_{1}-{t}_{0}}{86\;400}}-\Delta {m}_{1}\\{m}_{\text{p}2}=\left[({m}_{\text{pL}}+{m}_{\text{pT}}-\Delta {m}_{0}) {(1-\eta )}^{\tfrac{{t}_{1}-{t}_{0}}{86\;400}}-\Delta {m}_{1}\right]\cdot \\\qquad {(1-\eta )}^{\tfrac{{t}_{2}-{t}_{1}}{86\;400}}-\Delta {m}_{2}\end{cases} $
式中:Δmi为ti时刻用于加速(制动)消耗的推进剂质量,可根据式(1)计算。
该过程的约束条件如下:器月距离满足rmin≤ρ,ρ为月球引力范围半径:
$ \rho ={r}_{\text{moon}}{\left(\frac{{m}_{\text{moon}}}{{m}_{\text{earth}}}\right)}^{\tfrac{2}{5}} $
式中:${r}_{\text{moon}} $为地月平均距离;${m}_{\text{moon}} $为月球质量;${m}_{\text{earth}} $为地球质量。
如图3所示,将月面下降软着陆分为环月降轨、动力下降、定点软着陆、缓速下降4个阶段。建模时忽略引力摄动,预定着陆点在着陆准备轨道平面内,且主减速之后月球着陆器基本位于落月点正上方[17]。
1) 飞行时序。
① t0时刻:月球着陆器-空间转移运输系统从近月轨道出发,点火减速进入着陆准备轨道的时刻。
② t1时刻:月球抵达着陆准备轨道近月点,月球着陆器与空间转移运输系统分离,开启动力下降阶段的时刻。
2) 质量模型。根据月球着陆的飞行阶段,飞行器在运动过程中的质量变化为
$ {m}_{{\mathrm{sc}}}=\begin{cases}{m}_{\text{sL}}+{m}_{\text{sT}}+{m}_{\text{p0}}& \;\;\;\quad\qquad\qquad t={t}_{0}\\{m}_{\text{sL}}+{m}_{\text{sT}}+{m}_{\text{p0}} (1-\eta )^{\tfrac{t-{t}_{0}}{86\;400}}& \qquad\qquad {t}_{0} \lt t \lt {t}_{1}\\{m}_{\text{sL}}+{m}_{\text{p1}}& \;\;\;\quad\qquad\qquad t={t}_{1}\\{m}_{\text{sL}}+{m}_{\text{p1}} (1-\eta )^{\tfrac{t-{t}_{1}}{86\;400}}& \;\;\;\quad\qquad\qquad t \gt {t}_{1}\end{cases} $
式(24)还涉及$ {t}_{0} $、$ {t}_{1} $时刻的推进剂质量mpi,计算式为
$ \begin{cases}{m}_{\text{p}0}={m}_{\text{pL}}+{m}_{\text{pT}}-\Delta {m}_{0}\\{m}_{\text{p}1}={m}_{\text{pL}} {(1-\eta )}^{\tfrac{{t}_{1}-{t}_{0}}{86\;400}}\end{cases} $
3) 运动阶段。
① 环月降轨段。动力下降段自距月面一定高度时开始,故环月降轨段的着陆准备轨道近月点高度为动力下降段的月面高度。在本阶段,由空间转移运输系统将月球着陆器自环月停泊圆轨道霍曼变轨送至着陆准备椭圆轨道,如图4所示。该椭圆准备轨道的近月点、远月点半径分别为rA、rB。
② 动力下降段。该阶段目的是减小月球着陆器速度,并使月球着陆器接近月面。考虑月球曲率并建立月球极坐标系,如图5所示。
上述过程对应的动力学方程为
$ \begin{cases}{\dot{v}}_{{r}}=-\dfrac{{\mu }_{\text{m}}}{{r}^{2}}+\dfrac{v_{\theta }^{2}}{{r}}+\dfrac{{F}}{m}\sin \gamma \\{\dot{v}}_{\theta }=-\dfrac{{v}_{{r}}{v}_{\theta }}{r}-\dfrac{{F}}{m}\cos \gamma \end{cases} $
运动学方程为
$ \begin{cases}\dot{r}={v}_{{r}}\\\dot{\theta }=\dfrac{{v}_{\theta}}{r}\end{cases} $
式中:γ为推力的方向角,即推力与当地水平面的夹角;μm为月球引力常数;F为航天器推力的大小;$\dot{\theta } $为在月心极坐标系下的极角;νr、νθ分别为在月心极坐标系下,月球着陆器的径向速度、横向速度。
在本阶段的最优推力控制过程中,认为推力大小全程保持恒定,推力方向与速度方向的夹角可以写成关于时间的多项式形式:
$ \gamma =\sum \limits_{i=0}^{n}{a}_{i}{t}^{i} $
式中:ai为ti的系数。
以燃料消耗最小为优化目标,即
$ \min \Delta m=\int \nolimits_{0}^{t}\dot{m}\text{d}t $
③ 快速调整段。由于运动时间较短,本阶段及之后所有阶段均不考虑月球曲率影响,可以分解竖直方向与水平方向的运动,建立平面直角坐标系,如图6所示。
上述过程对应的动力学方程为
$ \begin{cases}{\dot{v}}_{x}=-\dfrac{{F}}{{m}}\cos \gamma \\{\dot{v}}_{y}=-\dfrac{{\mu }_{\text{m}}}{{r}^{2}}+\dfrac{{F}}{{m}}\sin \gamma \end{cases} $
运动学方程为
$ \begin{cases}\dot{x}={v}_{x}\\\dot{y}={v}_{y}\end{cases} $
④ 接近下降段。接近下降段的核心目标是避障,在竖直方向主要有2种控制方案:① 先保持匀速直线运动,达到预定高度时施加额外速度脉冲达到悬停;② 在竖直方向上先不施加主动力,保持一段时间的匀加速运动再开机反推,实现悬停。建立月球着陆器的受力分析如图7所示。
上述过程对应的动力学方程为
$ \ddot{y}=-\frac{{\mu }_{\text{m}}}{{r}^{2}}+\frac{{F}}{m} $
⑤ 缓速下降段。该阶段与上一阶段的运动微分方程相同,仅边界条件不同。
在第2节建立的模型基础上,本节对载人登月任务的主要阶段进行轨道仿真分析。在天地往返(发射段)阶段,火箭采用四氧化二氮/偏二甲肼推进剂;空间转移(交会段、地月段、落月段)阶段,轨道器使用低温推进剂(液氢液氧),暂不考虑推进剂在空间环境中蒸发损失的影响。
以LEO上空间站某参考时刻的轨道参数为基准,作为加注站轨道的初始条件,考虑其在地球J2项摄动影响下的轨道运动,计算其轨道参数。选择以地-月连线为远地点半径、加注站运行半径为近地点半径、与加注站运行平面共面的轨道,对变轨时刻、轨道倾角进行遍历,查询合适的窗口。
基于上述条件和约束,自2025-05-01T00:00:00起进行5月全月的地月转移窗口遍历搜索,得出结果如表5所示。
惯性坐标系下火箭、载人飞船、加注站的飞行轨迹图8所示。火箭从地面发射,到达LEO后与载人飞船分离,随即载人飞船进入LEO。通过调整发射时间,可以保证LEO与加注站轨道的升交点赤经相同,进而保证2个轨道处于同一平面,为载人飞船与加注站的交会对接奠定了基础。最终得到载人飞船入轨参数如表6所示。
以2025-05-03T00:00:00作为当前时刻,经3.2节计算得选定的发射时刻为2025-05-03T10:30:39,入轨时刻为2025-05-03T10:31:29,上述过程所需飞行时间为470 s。
计算所得载人飞船交会对接时的4段轨道如图9(a)所示,载人飞船与加注站的交会轨道如图9(b)所示。
各段变轨的时刻和速度增量如表7、表8所示。速度增量为负代表减速。
根据3.1节中遍历搜索,获得捕获效果较好的转移轨道,如图10所示。
基于上述轨道,绘制地月转移过程中的月球运动轨迹与航天器运动轨迹,如图11所示。
由图12可见,在地月转移的过程中,航天器与月球的距离是单调递减的。
月球着陆器载人落月过程的参数选定如表9所示。
4个下降阶段的仿真与优化计算具体如下。
1) 动力下降段。该下降阶段的切向速度较大,故需要考虑月球形状的影响,在极坐标系下进行计算。使用搜索算法,遍历搜索推力;在同一个推力下,采用浮点数编码的遗传算法对推力方向角的多项式系数进行优化,使得燃料消耗最少。该遗传算法的过程如图13所示[18]。
选择交叉概率为0.6,变异概率为0.1。根据计算结果绘制的动力下降段运动参数如图14所示。图14 (a)中,本运动阶段月球着陆器相对月球做环绕运动较径向运动显著。推力方向变化曲线如图14 (b)所示,本阶段推力与当地水平方向的夹角从0°缓缓增加至12°。速度变化曲线如图14(c)所示,由月球着陆器指向月心的方向为径向负向,该阶段主要消除了月球着陆器环绕月球的切向速度。
2) 快速调整段。该阶段及后续下降阶段的切向速度较小,故不考虑月球形状影响,在直角坐标系下计算。采用与动力下降段一致的优化方法。绘制快速调整段运动参数如图15所示。由图15 (a)运动轨迹示意图可见,该阶段月球着陆器接近于沿直线运动的状态。推力方向变化曲线如图15 (b)所示,该阶段推力方向几乎不变。速度变化曲线如图15 (c)所示,该运动阶段推力方向和速度方向夹角保持恒定,合速度的方向也几乎不变,月球着陆器在横向和纵向2个方向各自以恒定的加速度减速,水平方向减速至接近0,竖直方向上月球着陆器仍以一定速度下降。
3) 接近下降段。该阶段在竖直方向上采用的控制方案为:前期先关闭发动机,在月球引力下进行一段时间的匀加速运动,再启动发动机做一段时间的反推,达到预定高度时恰好实现悬停。
该过程匀加速下降时无需推力,开机反推时推力保持恒定,至距离月面50 m时速度为0,故采用搜索算法遍历匀加速下降段的时间t与匀减速段的反推推力F,目标为推进剂消耗最少。算法步骤如图16所示[19]。
4) 缓速下降段。本阶段初末速度均接近0,与上一阶段的微分方程与求解方法完全一致,仅有边界条件存在差异。由于存在缓速要求,将下降过程中最大速度也纳入考虑。至此,完成了4段落月过程的优化设计。
将上述工作所得的各阶段的仿真结果进行汇总,可以得到整个载人登月任务的流程,汇总结果如表10所示。
针对单次发射运载能力有限与大质量载人登月任务间的矛盾,本文参考前人的“接力式”地月运输方案,采用基于在轨加注的“两段式”载人登月任务模式,完成了任务规模分析、动力学建模与全流程轨道仿真。主要结论如下:
1) 通过模块化质量估算方法对比表明,基于在轨加注的载人登月任务方案系统质量规模,显著低于基于近月轨道一次对接的方案,可大幅减轻发射负担。
2) 建立了从发射至月面着陆的四阶段动力学模型,完成全流程数值仿真,明确了各阶段速度增量、推进剂消耗量等关键参数,为任务工程设计提供了依据。
3) 针对月球软着陆过程,对推力参数进行优化,实现燃料最省控制,为月球着陆器系统设计提供了参考。
开展新型地月空间转移运输系统的任务规划研究,对于高效、经济、灵活的航天运输任务具有巨大前景。后续考虑进一步研究基于在轨加注的多目标协同任务规划方法,在任务模型中耦合低温推进剂动力学,并开展加注时序、多任务调度与在轨存储机制的联合优化。

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2026年第52卷第10期
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doi: 10.13700/j.bh.1001-5965.2025.0468
  • 接收时间:2025-07-14
  • 首发时间:2026-10-30
  • 出版时间:2026-10-31
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  • 收稿日期:2025-07-14
  • 录用日期:2025-10-17
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    1北京航空航天大学 宇航学院,北京 102206
    2成都流体动力创新中心,成都 610031

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2种不同金属材料的力学参数
科
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属数
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种数
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species
占总种数比例
Percentage of
total species (%)
属
Genus
种数
Number of
species
占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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