Now showing items 31-50 of 50

    • Markov Modeling of Component Fault Growth Over A Derived Domain of Feasible Output Control Effort Modifications 

      Bole, Brian; Goebel, Kai; Vachtsevanos, George (Georgia Institute of Technology, 2012-08)
      This paper introduces a novel Markov process formulation of stochastic fault growth modeling, in order to facilitate the development and analysis of prognostics-based control adaptation. A metric representing the relative ...
    • Modeling Cockpit Interface Usage During Lunar Landing Redesignation 

      Chua, Zarrin K.; Major, Laura M.; Feigh, Karen M. (Georgia Institute of Technology, 2009)
      Fulfilling NASA's space exploration objectives requires precision landing to reach lunar sites of interest. During the approach and landing stages, a landing point redesignation (LPR) display will provide information to ...
    • Multidisciplinary Design Optimization Approach to Integrated Space Mission Planning and Spacecraft Design 

      Isaji, Masafumi; Takubo, Yuji; Ho, Koki (AIAA, 2022)
      Space mission planning and spacecraft design are tightly coupled and need to be considered together for optimal performance; however, this integrated optimization problem results in a large-scale mixed-integer nonlinear ...
    • Multifidelity Space Mission Planning and Infrastructure Design Framework for Space Resource Logistics 

      Chen, Hao; Sarton Du Jonchay, Tristan; Hou, Linyi; Ho, Koki (2021-03)
      To build a sustainable space transportation system for human space exploration, the design and deployment of space infrastructure, such as in-situ resource utilization plants, in-orbit propellant depots, and on-orbit ...
    • On-Orbit Servicing Optimization Framework with High- and Low-Thrust Propulsion Tradeoff 

      Sarton Du Jonchay, Tristan; Chen, Hao; Isaji, Masafumi; Shimane, Yuri; Ho, Koki (2021-07)
      This paper proposes an on-orbit servicing logistics optimization framework capable of performing the short-term operational scheduling and long-term strategic planning of sustainable servicing infrastructures that involve ...
    • Orion Capsule Launch Abort System Analysis 

      Scogin, Tyler; Lacerda, Michel; Marshall, Jordan (Georgia Institute of Technology, 2016)
      The objective of this report is to provide an analysis the Orion spacecraft’s Launch Abort System (LAS). A launch abort system aims to remove the crew away from a failing launch vehicle as soon as possible during the ...
    • Parachute Dynamic Stability and the Effects of Apparent Inertia 

      Ginn, Jason M.; Clark, Ian G.; Braun, Robert D. (Georgia Institute of Technology, 2014-06)
      The dynamic stability and equilibrium conditions of a parachute are studied using a six degree of freedom dynamic model that includes apparent inertia effects. Existing parachute dynamic models are discussed and the selection ...
    • Quantitative Assessment of Human Control on Landing Trajectory Design 

      Chua, Zarrin K. (Georgia Institute of Technology, 2010-12-02)
      An increased thirst for scientific knowledge and a desire to advance humanity's presence in space prompts the need for improved technology to send crewed vehicles to places such as the Moon, Mars, and nearby passing ...
    • Satellite Constellation Pattern Optimization for Complex Regional Coverage 

      Lee, Hang Woon; Shimizu, Seiichi; Yoshikawa, Shoji; Ho, Koki (2020-09)
      The use of regional coverage satellite constellations is on the rise, urging the need for an optimal constellation design method for complex regional coverage. Traditional constellations are often designed for continuous ...
    • Semi-Analytical Model for Design and Analysis of On-Orbit Servicing Architecture 

      Ho, Koki; Wang, Hai; DeTrempe, Paul A.; Sarton Du Jonchay, Tristan; Tomita, Kento (2020-05)
      Robotic on-orbit servicing (OOS) is expected to be a key technology and concept for future sustainable space exploration. This paper develops a novel semi-analytical model for OOS system analysis, responding to the growing ...
    • Sky Walking: An Astronaut's Journey 

      Jones, Thomas D. (Georgia Institute of Technology, 2020-01-16)
      Four-time space traveler Tom Jones shares the personal and spiritual experience of space exploration. You’ll rocket through a rumbling blast-off, soar into orbit, spacewalk at the Space Station, endure a fiery reentry, and ...
    • Space architecture design for commercial suitability: A case study in in-situ resource utilization systems 

      Sarton Du Jonchay, Tristan; Chen, Hao; Wieger, Anna; Szajnfarber, Zoe; Ho, Koki (2020-10)
      Space Agencies are increasingly interested in stimulating non-traditional players to participate more broadly in the space enterprise. Historically, high barriers to entry in the space market have included challenges of ...
    • Space Exploration Architecture and Design Framework for Commercialization 

      Chen, Hao; Ornik, Melkior; Ho, Koki (2021-10)
      The trend of space commercialization is changing the decision-making process for future space exploration architectures, and there is a growing need for a new decision-making framework that explicitly considers the ...
    • Spacecraft Attitude Control: A Consideration of Thrust Uncertainty 

      Golpashin, Alen E.; Yeong, Hoong C.; Ho, Koki; Namachchivaya, N. Sri (2020-09)
      To account for torque disturbances, and control trajectory error, a model of spacecraft attitude system is presented which replicates uncertainty in the class of continuous low-thrust systems. The generated uncertainty ...
    • Spacecraft trajectory tracking and parameter estimation around a splitting contact binary asteroid 

      Silva, Tiago M.; Bouvier, Jean-Baptiste; Xu, Kathleen; Hirabayashi, Masatoshi; Ho, Koki (2020-06)
      Increasing interest in asteroid mining and in-situ resource utilization will lead to an increase in asteroid surface operations. The geophysical properties of asteroids are often unknown and play a significant role in the ...
    • Spare Strategy Analysis for Life Support Systems for Human Space Exploration 

      Maxwell, Andrew J.; Wilhite, Alan; Ho, Koki (2021-07)
      Systems enabling long-duration crewed missions are expected to have high probabilities of success through sparing of components. To enable such systems, the tradeoff between the reliability and the mass needs to be ...
    • State Estimation using Gaussian Process Regression for Colored Noise Systems 

      Lee, Kyuman; Johnson, Eric N. (Georgia Institute of TechnologyIEEE, 2017-06)
      The goal of this study is to use Gaussian process (GP) regression models to estimate the state of colored noise systems. The derivation of a Kalman filter assumes that the process noise and measurement noise are uncorrelated ...
    • Terrain Height Evidence Sharing for Collaborative Autonomous Rotorcraft Operation 

      Johnson, Eric N.; Mooney, John G.; White, Matthew; Hartman, Jonathan; Sahasrabudhe, Vineet (Georgia Institute of Technology, 2013-01)
      This paper describes recent results from a partnership between the Sikorsky Aircraft Corporation and the Georgia Institute of Technology to develop, improve, and flight test a sensor, guidance, navigation, control, and ...
    • Towards Optimal Human-Machine Teaming 

      Clarke, John-Paul B. (Georgia Institute of Technology, 2019-07-29)
      Machines were initially designed to take over manual tasks. Over time, as sensors and algorithms became more capable, decision-making has been automated via prescribed rules. Further, when these rules can be verified a ...
    • Using Markov Models of Fault Growth Physics and Environmental Stresses to Optimize Control Actions 

      Bole, Brian; Goebel, Kai; Vachtsevanos, George (Georgia Institute of Technology, 2012-06-19)
      A generalized Markov chain representation of fault dynamics is presented for the case that available modeling of fault growth physics and future environmental stresses can be represented by two independent stochastic process ...