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Title:Stochastic design optimization of modular, reconfigurable, persistent support platforms in Earth orbit
Author(s):Perez, Jeff
Advisor(s):Ho, Koki
Department / Program:Aerospace Engineering
Discipline:Aerospace Engineering
Degree Granting Institution:University of Illinois at Urbana-Champaign
Subject(s):Stochastic design optimization
hosted payload platform
persistent support platform
modular satellite
spacecraft design optimization
multistage stochastic programming
on-orbit satellite servicing
servicing spacecraft
robotic servicer
reconfigurable satellite
Abstract:This thesis focuses on the design and optimization of modular, reconfigurable, hosted payload platforms operating in Earth orbit. Recent advancements in on-orbit servicing technologies and robotics are creating a market for hosted-payload platforms which can support multiple payloads with varying requirements. Such platforms can employ on-orbit servicing and robotic manipulation to repair or replace modules, enhance the platform’s capabilities over time, and reconfigure modules to optimize performance. Traditional spacecraft design is often driven largely by payload requirements. For the case of persistent platforms, however, not all payloads will be known in the initial design phase. This presents a unique challenge to designers, who must account for the uncertainty of future payloads by trading off between the costs of adding more capability to the platform initially, which assumes the risk of wasted costs due to over-designing the platform, and the costs of utilizing an on-orbit servicer to add capability as needed. The hosted payload platforms considered in this thesis consist of platform modules and payload modules and uses a standardized interface for intermodular and customer payload connection. Each platform module contains a critical satellite subsystem that is necessary for on-orbit functionality. As payloads are added to the platform over time, their demands may exceed the current capability of the platform, at which point additional platform modules can be added to increase the platforms capabilities. This thesis proposes an approach using a multi-stage stochastic programming method to create an initial platform design that is robust and flexible enough to support a wide range of payloads and minimizes the expected costs of future platform additions. Probability distributions for future payload selections are created based on a survey of active satellites. These distributions are then used to create samples of payload selection scenarios. Using a simple cost model, the expected costs associated with the addition of new payloads and the required platform modules are computed for each scenario in the sample. A genetic algorithm is used to find an optimal initial platform size that minimizes the combined total of the initial cost of the platform and the expected on-orbit servicing costs associated with adding future payloads and platform modules for each scenario. Platform designs are compared for a range of on-orbit servicing costs to determine the cost at which the optimizer begins to utilize servicing over adding more capability initially. Finally, a sensitivity analysis is performed to assess the variations in platform design due to the randomly selected payload scenario samples. The results of this work are a first step towards a solving a unique challenge presented by an emerging and increasingly relevant mission concept.
Issue Date:2019-04-23
Rights Information:Copyright 2019 Jeff Perez
Date Available in IDEALS:2019-08-23
Date Deposited:2019-05

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