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 20 of 28 for “"Flexible Systems"”.
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Command generation for flexible systems
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1997.
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Optimal rejection of nonstationary narrowband disturbances for flexible systems
… the optimal performance of these precision systems. The fundamental objective of this work is the development of an active control methodology capable of rejecting disturbances with narrowband nonstationary spectral distributions with particular focus on spacecraft reaction wheel induced …
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Speed Through Flexibility: Shortening the Acquisition Timeline of U.S. Defense Capabilities Using Flexible Systems
… procurement projects face a fundamental dilemma: systems designed and built today must serve the needs of the future, but future needs cannot be reliably forecasted. This reality drives the U.S. defense acquisition system, which creates and maintains defense capabilities in a constantly changing …
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Combined Mechanical and Command Design for Micro-Milling Machines
… the performance of micro-mills, as well as other flexible machines. Theses improvements are possible through the utilization of the vibration suppression scheme of input shaping. By thoughtfully altering the commands sent to flexible systems, their vibration can be significantly reduced. Input …
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On the power of (even a little) flexibility in dynamic resource allocation
… fraction of the total processing resources is flexible, or (b) each resource is capable of serving only a small number of demand types. Two main running themes are architecture and information: the former asks how a flexible system should be structured to fully harness the benefits of …
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Development of engineering tools to analyze and design flexible structures in open ocean environments
… the development of effective methods to predict flexible system response and the structural integrity of marine High Density Polyethylene (HDPE) components. Numerical modeling tools were developed to analyze and design flexible structures in open ocean environments. Enhancements to the University …
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ΔB₀ Field Control in High Field MRI with Local Multcoil Shim Arrays
… As MRI RF coils trend towards repositionable and flexible systems for their ease of use and tight-to-the-patient fit, ΔB₀ shim arrays are left behind for lack of rapid, patient-on-the-table calibration. We show an inverse problem approach with physics-based regularization and adaptation to …
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Quantifying flexibility in the operationally responsive space paradigm
Designing complex space systems that will deliver value in the presence of an uncertain future is difficult. As space system lifetimes are now measured in decades, the systems face increased risk from uncertain future contexts. Tradespace exploration increases the designer's system knowledge during …
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Análise dinâmica não-linear de sistemas rígido-flexíveis
… the implicit uses the Newmark Operator. Rigid-flexible systems, as soil-fluid-structures problems, are analysed. In the fluid-structure interaction, the stiffness contribution of fluid domains is disconsidered in order to improve the efficienty of a full implicit algorithm Isoparametric finite …
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Towards a lithium-ion fiber battery
One of the key objectives in the realm of flexible electronics and flexible power sources is to achieve large-area, low-cost, scalable production of flexible systems. In this thesis we propose a new Li-ion battery architecture in a fiber form that could be the building block to large-area, …
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An Architecture Study on a Xilinx Zynq Cluster with Software Defined Radio Applications
… in computational performance offered by computer systems has greatly increased the number of practical software defined radio applications. The addition of FPGAs to these flexible systems has resulted in platforms that can address a multitude of applications with performance levels that were once …
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A scalable process for rapid and uniform assembly of repeated origami-like structures using elastic membranes
… the production of tissue scaffolds or other flexible systems at a fraction of the cost and time required by competing methods such as 3D printing. No existing research has attempted to apply folding to the manufacture of artificial organs and tissues; this work is the first to do so. This …
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A life-cycle flexibility framework for designing, evaluating and managing "complex" real options : case studies in urban transportation and aircraft systems
Designing a flexible system with real options is a method for managing uncertainty. This research introduces the concept of "complex" real options, which are composed of interconnected echnological, organizational and process components. "Complex" real options differ from the "standard" real …
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Control and design of flexible-link manipulators
The control of non-minimum phase systems remains an important open problem in nonlinear control, finding relevance in the control of underactuated and flexible systems. One wishes to cause the output of a dynamical system to track a desired trajectory while maintaining internal stability of a …
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THAL: An Actor System for Efficient and Scalable Concurrent Computing
… are comparable to the performance of other less flexible systems.
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On the design for flexibility of manufacturing systems : a stochiastic approach
… analytical models are for the optimum design of flexible systems. The models introduced are based on extensions of the single period stochastic inventory model and real option theory to determine the optimum level of the various flexibility attributes that are required to meet the needs of a …
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Flexibility in building design : a real options approach and valuation methodology to address risk
… develops an approach to designing and valuing flexible systems subject to identified future uncertainties. The approach addresses two shortcomings of current design and decision-making practices that are particularly evident in the buildings industry: 1) systems are designed as though they will …
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On Demand Liquid Metal Programming for Composite Property Tuning
… are required for these soft, stretchable, and flexible systems. Further, the ability to effectively tune not only these mechanical properties but also their thermal and electrical properties is key to developing multifunctional materials for soft electronic applications. In this thesis, we …
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Religion in the Legal Systems of Turkey and Morocco
… that both Morocco and Turkey have lenient and flexible systems of laws that regulate religion, and both of these countries could serve as examples of efficient governmental regulation of the religious realm. Although Turkey has been a secular country since the demise of the Ottoman Empire in …
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Photodetection and Spectrometry at the Nanoscale
… as nanoscale components within miniaturised or flexible systems. In this thesis, optoelectronic device platforms based around two such nanomaterial systems – compositionally-engineered nanowires and layered black phosphorus – are developed and studied. An ultra-miniaturised microspectrometer …
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