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 7 of 7 for “"passive isolation"”.
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Element and system design for active and passive vibration isolation
This thesis focusses on broadband vibration isolation, with an emphasis on control of absolute payload motion for ultra-precision instruments such as the MIT/Caltech Laser-Interferometric Gravitational Wave Observatory (LIGO), which is designed to measure spatial strains on the order of 10-²¹. We …
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A low cost, DC-coupled active vibration isolation system
In this thesis, I designed and implemented an isolation system that interfaces with traditional air mounts for improved force disturbance rejection relative to passive optical tables.Force disturbance rejection and position alignment are two major functional requirements of vibration isolation …
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Analysis, Simulation, and Measurement of Micro-Vibrations in Reaction Wheels for High-Performance Imaging Missions
… reaction wheel pyramid mounted to an elastomeric isolation system quantified the attenuation of transmitted vibrations and demonstrated the effectiveness of passive isolation at high frequencies, as well as its limitations at low frequencies. Finally, an air-bearing platform experiment was used to …
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Dynamic accident sequence analysis using dynamic flowgraph method and Markov/cell-to-cell mapping technique
… for integrated reliability assessment of passive safety systems in small modular reactors. A stochastic model of a passive Isolation Condenser System (ICS) was developed, and its state transition probabilities are computed using finite element method. The analysis predicts high system …
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Dynamics and Control for Vibration Isolation Design
… is the most widely used model for vibration isolation systems. The SDOF system is a simple but worthy model because it quantifies many results of an isolation system. For instance, a SDOF model predicts that the high frequency transmissibility increases when the isolator has passive damping …
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Multi-axial Active Isolation for Seismic Protection of Buildings
… of structures against seismic hazards. Passive base isolation is one of the common structural control techniques used to enhance the performance of structures subjected to severe earthquake excitations. Isolation bearings employed at the base of a structure naturally increase its …
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Control of Sound Transmission with Active-Passive Tiles
… control strategies. In this work an active-passive sound transmission control approach is investigated that potentially addresses these requirements. The approach involves the use of lightweight stiff panels, or tiles, attached to a radiating base structure through active-passive soft mounts …