Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 14 of 14 for “"Mass Savings"”.
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The impact of mass decompounding on assessing the value of vehicle lightweighting
… changes in processing. Although primary vehicle mass reduction is often associated with additional costs to the automaker, a decision to lightweight may, depending on when in the vehicle development process the decision is taken, result in additional secondary mass savings such that the value …
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A technical evaluation of a novel cell-surface cytokine detection technology
… chemical propulsion systems due to the great mass savings they provide through high specific impulses. However, a major stumbling block to their widespread integration is uncertainty about the thruster plume's interaction with spacecraft components. While in-space data is difficult to collect, …
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Computational modeling of a Hall thruster plasma plume in a vacuum tank
… chemical propulsion systems due to the great mass savings they provide through high specific impulses. However, a major stumbling block to their widespread integration is uncertainty about the thruster plume's interaction with spacecraft components. While in-space data is difficult to collect, …
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Digital Sun Sensor Design for Nanosatellite Applications
… is chosen due to lower power requirements, mass savings and simpler readout interface and signal processing in comparison to the matrix based approach. The Sun sensor design presented maximises the accuracy, while keeping the cost, development and implementation time and complexity to …
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Multi-Objective Exploration of Refueling Architecture for Sustainable Crewed and Cargo Space Transportation
… using an iterative approach to ensure consistent mass estimates across configurations. The framework is applied to analyze human landing system (HLS) architectures with refueling in cis-lunar space. The key findings highlight the mass savings benefits of cryocoolers, the benefits of high Isp with …
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Modeling of Hall thruster lifetime and erosion mechanisms
… Large Isp translates to a highly desirable mass savings and system trades show that Hall thrusters fall in an optimum operation regime well suited for missions such as station-keeping and orbit transfers. However, uncertainty about thruster lifetime has impeded the device's widespread …
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Lunar lander propellant production for a multiple site exploration mission
… all selected landing sites. A value of the total mass savings of the processing plant architecture over these two architectures is used as a means of quantifying the benefit for future lunar exploration. The mass of the power system is found, to be the dominant component of the overall system mass …
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Modeling and Optimization of In-Space Manufacturing to Inform Technology Development
… indicate that the maximum possible spares mass savings for a 0.45 m^3 ISM facility is limited to 52% by build volume constraints alone. For the case of ISM solar arrays, the results reveal that a state-of-the-art specific power of 300 W/kg can be realized by an ISM concept that uses …
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Quantitative probabilistic modeling of environmental control and life support System resilience for long-duration human spaceflight
… alongside traditional system metrics such as mass and cost early in the design process in order to select the optimal ECLSS design for a given mission. This thesis presents the use of semi-Markov process (SMP) models to quantify the resilience of long-duration ECLSS. An algorithm is defined to …
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Evaluating the interaction between material substitution and part sharing in product design : a case study of automotive lightweighting
… conflict, as minimizing costs leads firms toward mass production, and meeting consumer needs leads firms toward product differentiation. One strategy to resolve these conflicting goals is to share component parts across distinct product variants allowing firms to maintain differentiated products …
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Nonlinear Dynamics in Metamaterials under Elastic and Plastic Excitation and Spectral Submanifold Parameterization
… designs with superior performance and mass savings relative to a uniform rod are found for the idealized longitudinal problems of vibration and damage mitigation, drop protection, and occupant protection. These scenarios demonstrate the ability of elastic metamaterials to mitigate …
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Technology development targets for commercial In-Space Manufacturing
… to revolutionize space systems by reducing mass, lowering costs, and enabling entirely new designs through the orbital fabrication of components in the space environment in which they are intended to operate for their entire life. Because ISM changes many long-standing launch-related design …
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Support of latency-sensitive space exploration applications in future space communication systems
… When optical communications are indeed present, mass savings for the relay system are also possible, albeit trading latency vs. infrastructure costs is less effective and highly dependent on the performance of the deep space optical link.