ASCEND 2020最新文献_第9页

Deployment Strategies for Reconfigurable Satellite Constellations 可重构卫星星座的部署策略

ASCEND 2020 Pub Date : 2020-11-02 DOI: 10.2514/6.2020-4246

Alexandra Straub, D. Hastings, David W. Miller, O. Weck

{"title":"Deployment Strategies for Reconfigurable Satellite Constellations","authors":"Alexandra Straub, D. Hastings, David W. Miller, O. Weck","doi":"10.2514/6.2020-4246","DOIUrl":"https://doi.org/10.2514/6.2020-4246","url":null,"abstract":"With the emerging democratization of space, Earth Observation (EO) imagery is becoming increasingly important to a variety of industries. However, it remains diﬃcult and expensive to build constellations that achieve continuous and high-quality global coverage. Reconﬁguring a satellite constellation into diﬀerent orbital planes to change its observational performance is traditionally a fuel intensive procedure. The concept of a reconﬁgurable constellation (ReCon) accounts for 𝐽 2 perturbation eﬀects when making fuel eﬃcient maneuvers to shift a satellite’s ground track. ReCon reduces the cost of high revisit frequency, high-quality resolution, EO constellations compared to nonreconﬁgurable constellations by reducing the number of satellites required to achieve repeated observations of a given ground event on demand. This paper ﬁrst explores the sensitivities of ReCon’s performance against uncertainties in reconﬁguration demand, design costs, and imagery value. The sensitivity analysis reveals that in cases of extremely low demand, ReCon fails to provide a cost-eﬀective solution in terms of events responded to per dollar spent. In cases of high demand ReCon fails to meet demand altogether. A Monte Carlo analysis over a range of demand scenarios shows using a staged deployment for ReCon oﬀers a ﬂexible, cost-eﬀective solution to the uncertainties in the demand of EO imagery. Deferring launch costs to the future, through a staged deployment, not only provides ﬂexibility in constellation design, but also allows the designer to capitalize on the continuation of lowering launch costs and increasing launch opportunities. Staging the deployment of constellations also allows for the satellites’ technology to evolve over time, facilitating the captured of higher value imagery and further enhancing the capabilities of ReCon. Implementing the option to deploy additional satellites in stages makes ReCon signiﬁcantly better equipped to respond to the uncertainty in the demand of space assets.","PeriodicalId":153489,"journal":{"name":"ASCEND 2020","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124792804","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

SLS with Kick Stages for Science Missions to the Outer Planets and Beyond 用于外行星和更远的科学任务的SLS

ASCEND 2020 Pub Date : 2020-11-02 DOI: 10.2514/6.2020-4071

Terry D. Haws, Michael E. Fuller

引用次数: 1

Undergraduates Building Spacecraft: Using Inquiry-based Methods to Teach Spacecraft Engineering 大学生建造航天器:运用探究式教学方法进行航天器工程教学

ASCEND 2020 Pub Date : 2020-11-02 DOI: 10.2514/6.2020-4155

E. Bering, D. Hampton, Nicole Moelders, R. Talbot, Shuhab D. Khan, M. Moges, L. Jacobs, R. Gamblin, Michael L. Greer, Bryan Gunawan, E. Hernandez, J. Lehnen, M. Piña, I. Porat, J. Prince, A. G. Pessoa, Alexandra Briggs-Ulinsky

引用次数: 0

Design of an autonomous and teleoperated modular robotic free-flyer for EVA operations 自主遥控模组化自由飞行机器人的设计

ASCEND 2020 Pub Date : 2020-11-02 DOI: 10.2514/6.2020-4257

V. Netti

引用次数: 0

Commissioning and Testing of Dusty Thermal Vacuum Chamber Designed for Lunar Environment Simulation 月球环境模拟含尘热真空室的调试与试验

ASCEND 2020 Pub Date : 2020-11-02 DOI: 10.2514/6.2020-4197

M. Guadagno, P. V. Susante

引用次数: 1

Stowage Assessment of the Common Habitat Baseline Variants 常见生境基线变异的积载评估

ASCEND 2020 Pub Date : 2020-11-02 DOI: 10.2514/6.2020-4053

R. Howard

引用次数: 2

Preliminary Structural Design and Aerodynamic Analysis of Mars Science Helicopter Rotors 火星科学直升机旋翼初步结构设计与气动分析

ASCEND 2020 Pub Date : 2020-11-02 DOI: 10.2514/6.2020-4025

Cheng Chi, Ravi T. Lumba, Y. Jung, A. Datta

引用次数: 3

Defining the Required Net Habitable Volume for Long-Duration Exploration Missions 确定长期探索任务所需的净可居住体积

ASCEND 2020 Pub Date : 2020-11-02 DOI: 10.2514/6.2020-4032

C. Stromgren, C. Burke, Jason Cho, M. Rucker, M. Garcia-Robles

{"title":"Defining the Required Net Habitable Volume for Long-Duration Exploration Missions","authors":"C. Stromgren, C. Burke, Jason Cho, M. Rucker, M. Garcia-Robles","doi":"10.2514/6.2020-4032","DOIUrl":"https://doi.org/10.2514/6.2020-4032","url":null,"abstract":"—As the National Aeronautics and Space Administration continues planning for long-duration space missions, specifically to Mars, it will be necessary to understand the requirements for a “transit habitat”, the element that the crew will live in as they travel to and from Mars. In particular, understanding of volume requirements for the transit habitat is of significant importance because the volume is a first order driver of the habitat size and mass, and therefore the propulsion and propellant requirements for future Mars missions. Despite this importance, there is significant uncertainty regarding how much habitable volume is required to support the crew on these missions. Prior studies provide valuable background, but their focus has largely been on investigating historical analogs in order to develop parametric sizing formulas. Other research has focused on specific drivers of habitat volume and stressors to the crew. However, there has been limited focus on establishing a comprehensive minimum required habitable volume based on crew activity needs and crew health requirements. This paper will describe a detailed effort to establish the minimum required net habitable volume for a Mars Transit Habitat employing a bottom-up methodology. The process used to establish volumetric requirements involves the definition of a set of specific “crew functions” and the assignment of required volumes to each function. This type of bottom-up approach is the most accurate method to establish required habitat volume and is specifically recommended by the NASA Chief Medical Officer for future space missions. The authors established a taxonomy of crew functions that could be required during a Mars transit. These functions include direct operational activities, such as command and control or system maintenance, habitation activities, such as eating and sleeping, or","PeriodicalId":153489,"journal":{"name":"ASCEND 2020","volume":"141 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121296949","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: 3

MIP: the First ISRU Flight Experiment 第一次ISRU飞行实验

ASCEND 2020 Pub Date : 2020-11-02 DOI: 10.2514/6.2020-4234

G. Landis

引用次数: 0

Vertical Entry Robot for Navigating Europa (VERNE) Mission and System Design 垂直进入木卫二导航机器人(VERNE)任务及系统设计

ASCEND 2020 Pub Date : 2020-11-02 DOI: 10.2514/6.2020-4061

F. Bryson, M. Nassif, Phillip A. Szot, C. Chivers, N. Daniel, Bridget E. Wiley, T. Plattner, A. Hanna, Yashvardhan Tomar, Samuel Rapoport, E. Spiers, Sara Pierson, A. Hodges, J. Lawrence, A. Mullen, D. Dichek, K. Hughson, M. Meister, E. Lightsey, B. Schmidt

引用次数: 8