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 36 for “"passive systems"”.
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Output Synchronization of Networked Passive Systems
… of synchronization of multiple Lagrangian systems. The problems of multi-robot coordination and of bilateral teleoperation with time delay are shown to be special cases of our general results.
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Calculating failure probabilities of passive systems during transients
… reliability evaluation of a two-loop passive Decay Heat Removal (DHR) system was performed as part of the iterative design process for a helium-cooled fast reactor. The system was modeled using RELAP5-3D. The uncertainties in input parameters were assessed and were propagated through …
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Prediction techniques for passive systems' probability of failure
… framework of the on-going debate centered on Passive System reliability. Its aim is to provide insights into the design of a dependable method to evaluate the reliability of Passive Systems. In order to achieve this, a method is proposed that focuses on the identification of the fundamental …
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Black Box Modeling of Passive Systems by Rational Function Approximation
The modified minimum phase, all pass, and delay (MAD) method for black-box modeling is proposed and validated. Using this method, a black-box system is modeled as three parts, a minimum phase subsystem, an all-pass subsystem, and a delay term. Since this model precisely capture the physical …
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Narrowband passive systems theory with applications to positioning and navigation.
Thesis. 1975. Sc.D. cn--Massachusetts Institute of Technology. Dept. of Electrical Engineering and Computer Science.
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Integral Identities for Passive Systems and Spherical Waves in Scattering and Antenna Problems
… multiple-output (MIMO) communication systems. This thesis is also the first to present a method to estimate spherical wave coefficients from propagation channel measurements. The results of this thesis can roughly be divided into three categories: Firstly, a general approach to derive …
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Sum rules and constraints on passive systems - a general approach and applications to electromagnetic scattering
… processes are often modeled as input-output systems. Many such systems obey passivity, which means that power is dissipated in the process. This thesis deals with the inevitable constraints imposed on physical systems due to passivity. A general approach to derive sum rules and physical …
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Methods for comparative assessment of active and passive safety systems with respect to reliability, uncertainty, economy, and flexibility
Passive cooling systems sometimes use natural circulation, and they are not dependent on emergency AC power or offsite power, which can make designs simpler through the reduction of emergency power supplying infrastructure. The passive system approach can lead to substantial simplification of the …
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The impact of passive safety systems on desirability of advanced light water reactors
… the advanced light water reactor designs with passive safety systems are more desirable than advanced reactor designs with active safety systems from the point of view of uncertainty in the performance of safety systems as well as the economic implications of the passive safety systems. Two …
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Engineering fundamentals of energy efficiency
… upgrade energy into more useable forms, and passive systems, from which energy is lost as low temperature heat, in exchange for final services. Theoretical efficiency limits are calculated for conversion devices using exergy analysis, and show a 89% potential reduction in energy use. Efforts …
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Linear Discrete-time Dissipative Systems
… is an important unifying concept across systems and control theory, being a generalisation of the concept of energy and the stability methods of Lyapunov. This thesis concerns discrete-time dissipative systems, and its main goal is to present versions of the discrete-time positive real …
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An active seating system for prevention of pressure sores
… pressure sores. This system can be used in passive or active form, depending on an individual's requirement for pressure management and relief. The active seat uses vacuum and pressure in combination with an open-cell-foam-based cushion to perform pressure relief. Testing methods for the …
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Column Footings Strengthened with External Prestressing and External Wrapping Systems
… this problem, five upgraded footing enlargement systems are proposed in this dissertation:</p> <p>• Circular external prestressing system (CEP);</p> <p>• Circular external regular reinforcement system (CERR);</p> <p>• Circular external BFRP wrapping system (CEBW);</p> <p>• Circular external CFRP …
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Pathways and frameworks for the licensing and regulation of advanced nuclear reactors in the United States
… These advanced nuclear power plants can utilize passive systems, new fuel forms or coolants, or other new design features to accomplish their safety and security functions. Advanced reactors may not comply with existing requirements for nuclear power plant licensing due to their departure from …
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Analyzing physical system interaction
… a form of Lyapunov stability for interacting systems. The systems previously studied were purely passive in nature. No system was capable of power generation, and no power could enter through command inputs or external perturbations. As such, the stability results have a narrow range of …
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Studio e sviluppo di sistemi RFID in banda UHF
… and greater and faster data exchange. UHF-RFID systems, exploiting a physical interaction based on Electromagnetic propagation, introduce many problems that have not been fully explored for the previous generations of RFID systems (e.g. HF). Therefore, the availability of reliable tools for …
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Incorporation of Corrosion Mechanisms into a State-dependent Probabilistic Risk Assessment
… power plants and an increased interest in passive safety systems in Generation III+ and small modular reactors has brought a new focus in probabilistic risk assessment (PRA) to the treatment of passive systems, structures and components (SSCs). Although previously thought to play a lesser …
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3D Upper-extremity ExoNET: Improved Passive Exoskeleton for Gravity Compensation and Motor Rehabilitation
Although passive designs may appear simple, their lightweight, low cost, and user-friendly configuration make them highly practical for use beyond controlled laboratory settings. Min imal setup, easy donning and doffing, and low maintenance allow both patients and clinicians to operate on them with …
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Gradient projection anti-windup scheme
… affects virtually all practical control systems. It leads to controller windup, which degrades/limits the system's closed-loop performance, and may cause catastrophic failures if it induces instability. Anti-windup compensation is one of two main approaches to mitigate the effects of …
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reBURB: Redefining the Suburban Family Unit Under a New Construction Ecology
… into a statically defined entanglement of systems with a primary goal of separating humans from natural systems by providing a climatically fixed space with little regard to the environment. This separation has served to detach people and the buildings that they inhabit from their …
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