[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"detail-sidebar-cat-0-en-105":3,"doc-seo-136922-105":59,"doc-detail-136922-en":130},{"code":4,"msg":5,"data":6},0,"success",[7,13,18,23,28,33,38,43,48,51,55],{"id":8,"doc_module":4,"doc_module_name":9,"category_name":10,"show_sort_weight":11,"slug":12},1,"Document","Story & Novel",90,"story-novel",{"id":14,"doc_module":4,"doc_module_name":9,"category_name":15,"show_sort_weight":16,"slug":17},2,"Literature",80,"literature",{"id":19,"doc_module":4,"doc_module_name":9,"category_name":20,"show_sort_weight":21,"slug":22},4,"Exam",70,"exam",{"id":24,"doc_module":4,"doc_module_name":9,"category_name":25,"show_sort_weight":26,"slug":27},5,"Comic",60,"comic",{"id":29,"doc_module":4,"doc_module_name":9,"category_name":30,"show_sort_weight":31,"slug":32},6,"Technology",50,"technology",{"id":34,"doc_module":4,"doc_module_name":9,"category_name":35,"show_sort_weight":36,"slug":37},7,"Healthcare",40,"healthcare",{"id":39,"doc_module":4,"doc_module_name":9,"category_name":40,"show_sort_weight":41,"slug":42},8,"Research & Report",30,"research-report",{"id":44,"doc_module":4,"doc_module_name":9,"category_name":45,"show_sort_weight":46,"slug":47},9,"Religion & Spirituality",20,"religion-spirituality",{"id":46,"doc_module":4,"doc_module_name":9,"category_name":49,"show_sort_weight":46,"slug":50},"World Cup","world-cup",{"id":52,"doc_module":4,"doc_module_name":9,"category_name":53,"show_sort_weight":52,"slug":54},10,"Lifestyle","lifestyle",{"id":56,"doc_module":4,"doc_module_name":9,"category_name":57,"show_sort_weight":24,"slug":58},19,"General","general",{"code":4,"msg":60,"data":61},"ok",{"site_id":62,"language":63,"slug":64,"title":65,"keywords":66,"description":67,"schema_data":68,"social_meta":123,"head_meta":125,"extra_data":127,"updated_unix":129},105,"en","earth-return-aerocapture-for-the-transhabellipsled-vehicle-final-study-report-nasa-grant-nag1-2163","Earth Return Aerocapture for the TransHab/Ellipsled Vehicle - Final Study Report - NASA Grant NAG1-2163","","NASA’s human Mars mission architecture considers using aerocapture at arrival at Mars and possibly during Earth return to decelerate vehicles and insert them into target orbits without propulsive orbital insertions. The TransHab inflatable habitat would be captured into Earth orbit using an aeroshell, “Ellipsled,” providing aerodynamic lift and thermal protection during atmospheric entry. The study determines undershoot/overshoot bounds, entry corridor widths, sensitivity to atmospheric and vehicle parameters, heating rates, and roll-control strategies targeting specific inclinations, energies, and, with blended control, longitude of the ascending node.",{"@graph":69,"@context":122},[70,84,105],{"@type":71,"itemListElement":72},"BreadcrumbList",[73,77,79,82],{"item":74,"name":75,"@type":76,"position":8},"https://docshare.wps.com","Home","ListItem",{"item":78,"name":9,"@type":76,"position":14},"https://docshare.wps.com/document/",{"item":80,"name":40,"@type":76,"position":81},"https://docshare.wps.com/document/research-report/",3,{"item":83,"name":65,"@type":76,"position":19},"https://docshare.wps.com/document/earth-return-aerocapture-for-the-transhabellipsled-vehicle-final-study-report-nasa-grant-nag1-2163/136922/",{"url":83,"name":65,"@type":85,"image":86,"author":91,"headline":65,"publisher":94,"fileFormat":97,"inLanguage":63,"description":67,"dateModified":98,"datePublished":99,"encodingFormat":97,"isAccessibleForFree":100,"interactionStatistic":101},"DigitalDocument",{"url":87,"@type":88,"width":89,"height":90},"https://docshare.wps.com/thumbnails/earth-return-aerocapture-for-the-transhabellipsled-vehicle-final-study-report-nasa-grant-nag1-2163/136922.png","ImageObject",300,407,{"name":92,"@type":93},"Asher","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-10-17","2026-08-22",true,{"@type":102,"interactionType":103,"userInteractionCount":24},"InteractionCounter",{"@type":104},"ViewAction",{"@type":106,"mainEntity":107},"FAQPage",[108,114,118],{"name":109,"@type":110,"acceptedAnswer":111},"What is the purpose of aerocapture during Earth return in this study?","Question",{"text":112,"@type":113},"Aerocapture is proposed to decelerate the vehicle during Earth atmospheric entry and insert it into desired target orbits without requiring propulsive orbital insertions.","Answer",{"name":115,"@type":110,"acceptedAnswer":116},"Which variables are analyzed for their effects on the Earth-return entry corridor and heating?",{"text":117,"@type":113},"The study examines sensitivity to atmospheric density profile, vehicle deceleration limit, maximum roll rate, target orbit, and ballistic coefficient, along with resulting stagnation-point heating rates and integrated heat loads.",{"name":119,"@type":110,"acceptedAnswer":120},"How does roll control help achieve the desired orbital targets?",{"text":121,"@type":113},"An undershoot roll maneuver (including a 180-degree roll) and a three-roll sequence are used to target specific orbital energy and inclination, reducing post-aerocapture delta-V; later work evaluates improved targeting of longitude of the ascending node with blended roll/pitch control.","https://schema.org",{"og:url":83,"og:type":124,"og:title":65,"og:site_name":95,"og:description":67},"article",{"robots":126,"canonical":83},"index,follow",{"doc_id":128,"site_id":62},136922,1787395333,{"code":4,"msg":5,"data":131},{"doc_id":128,"user_id":132,"nickname":92,"user_avatar":133,"doc_module":4,"category_id":39,"category_name":40,"doc_title":65,"doc_description":67,"doc_content":134,"file_id":135,"file_url":136,"file_type":137,"file_size":138,"view_count":24,"is_deleted":4,"is_public":8,"is_downloadable":8,"audit_status":8,"page_count":139,"language":140,"language_code":63,"site_id":62,"html_lang":63,"table_of_contents":141,"faqs":142,"seo_title":143,"seo_description":67,"update_tm":129,"read_time":144},687197207639,"https://ap-avatar.wpscdn.com/davatar_a8503ba1806abce46bf441b54a3ca4cd","Earth Return Aerocapture for the TransHab/Ellipsled VehicleFinal Study Report for NASA Grant NAG1-2163  \nPrepared By:W.D.Muth  \nC.Hoffmann&  \nJ.E.Lyne  \nThe University of Tennessee at KnoxvilleAerospace Engineering  \nOctober 2000  \nAbstract  \nThe current architecture being considered by NASA for a human Mars missioninvolves the use of an aerocapture procedure at Mars arrival and possibly upon Earthreturn.This technique would be used to decelerate the vehicles and insert them into theirdesired target orbits,thereby eliminating the need for propulsive orbital insertions.Thecrew may make the interplanetary journey in a large,inflatable habitat known as theTransHab.It has been proposed that upon Earth return,this habitat be captured into orbitfor use on subsequent missions.In this case,the TransHab would be complimented withan aeroshell,which would protect it from heating during the atmospheric entry andprovide the vehicle with aerodynamic lift.The aeroshell has been dubbed the \"Ellipsled\"because of its characteristic shape.This paper reports the results of a preliminary study ofthe aerocapture of the TransHab/Ellipsled vehicle upon Earth return.Undershoot andovershoot boundaries have been determined for a range of entry velocities,and the effectsof variations in the atmospheric density profile,the vehicle deceleration limit,themaximum vehicle roll rate,the target orbit,and the vehicle ballistic coefficient have beenexamined.A simple,180 degree roll maneuver was implemented in the undershoottrajectories to target the desired 407 km circular Earth orbit.A three-roll sequence wasdeveloped to target not only a specific orbital energy,but also a particular inclination,thereby decreasing propulsive inclination changes and post-aerocapture delta-Vrequirements.Results show that the TransHab/Ellipsled vehicle has a nominal corridorwidth of at least 0.7 degrees for entry speeds up to 14.0 km/s.Most trajectories weresimulated using continuum flow aerodynamics,but the impact of high-altitude viscouseffects was evaluated and found to be minimal.In addition,entry corridor comparisons  \nhave been made between the TransHab/Ellipsled and a modified Apollo capsule which isalso being considered as the crew return vehicle;because of its slightly higher lift-to-dragratio,the TransHab has a modest advantage with regard to corridor width.Stagnation-point heating rates and integrated heat loads were determined for a range of vehicleballistic coefficients and entry velocities.  \nUsing the arrival vector for a 2020 fast-transit return,trajectories were runbeginning at the edge of Earth's sphere of influence.This assured that these simulationsused realistic entry latitude/azimuth combinations,while targeting orbits of specificinclinations.For this particular case (in which the arrival declination was -0.7 degreesand the atmospheric entry speed was 11.91 km/s),using the three-roll sequence and anappropriate choice of the azimuth at the edge of the SOI,the vehicle was able to reachcircular parking orbits with inclinations ranging from 5.3 to 51.6 degrees.In addition,itwas shown that capture into a highly elliptical parking orbit may be feasible.Such astrategy would reduce the integrated heat load during aerocapture and result in a lower  \n△V for the trans-Mars injection at the next mission opportunity,but would require precisealignment of the capture orbit with respect to the departure hyperbola for the subsequentmission.  \nPreliminary work has been done to evaluate the ability of an aerocapturemaneuver to target not only a specific orbital energy and inclination,but also a particularlongitude of the ascending node;it was found that the current roll control strategy is ableto influence the LAN only slightly.The implementation of a blended roll/pitch controlalgorithm similar to that developed by Jits and Walberg for Mars aerocapture mightimprove targeting ability and give more control over longitude of the ascending node.  \n# Study Objectives\n\nThis document p","cbCaijljBwUzbViE","https://ap.wps.com/l/cbCaijljBwUzbViE","pdf",1617527,54,"English","# Study Objectives\n## Vehicle Specifications","[{\"question\":\"What is the purpose of aerocapture during Earth return in this study?\",\"answer\":\"Aerocapture is proposed to decelerate the vehicle during Earth atmospheric entry and insert it into desired target orbits without requiring propulsive orbital insertions.\"},{\"question\":\"Which variables are analyzed for their effects on the Earth-return entry corridor and heating?\",\"answer\":\"The study examines sensitivity to atmospheric density profile, vehicle deceleration limit, maximum roll rate, target orbit, and ballistic coefficient, along with resulting stagnation-point heating rates and integrated heat loads.\"},{\"question\":\"How does roll control help achieve the desired orbital targets?\",\"answer\":\"An undershoot roll maneuver (including a 180-degree roll) and a three-roll sequence are used to target specific orbital energy and inclination, reducing post-aerocapture delta-V; later work evaluates improved targeting of longitude of the ascending node with blended roll/pitch control.\"}]","Earth Return Aerocapture for the TransHab/Ellipsled Vehicle - Final Study Report - NASA Grant NAG1-2163 | PDF",136]