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 283 for “"Absorbers"”.
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Compliant water wave absorbers.
Massachusetts Institute of Technology. Dept. of Naval Architecture and Marine Engineering. Thesis. 1965. Ph.D.
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Granular sloshing absorbers for vibration control
… earthquakes or other shocks. Passive and active absorbers are employed, often at great expense, to stabilise the structures for the safety and comfort of the occupants. Current passive damper technologies include Tuned Mass Dampers and Tuned Liquid Dampers. These devices provide optimal damping …
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Vibration simulation of plate with attached multiple absorbers
… in this study, the concept of Dynamic Vibration Absorbers (DVA) are used to reduce vibration or amplitude. On a Simply Supported Plate (SSP) structure, the method used in this study were of analytical equations and finite element analysis. MATLAB ® is used to solve the equations of analytical …
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Stealth technologies based on thin microwave FSS absorbers
… deployment of ultra-thin (≤ λ/17) microwave FSS absorbers is proposed as a means to reduce the scattering of electromagnetic energy from the surface of satellite platforms which are covered with thermal blankets. This is achieved by exploiting the similarity of the physical construction of this …
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A Study of Distributed Active Vibration Absorbers (DAVA)
DAVAs are distributed active and passive devices that can be numerically modelled to provide optimum control of low frequency (< 1000 Hz) mean square velocity and sound power radiation. A numerical model of a multi-DAVA system was developed using the Rayleigh-Ritz method coupled to a hierarchical …
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Nonlinear vibrations: a comparative study with applications to centrifugal pendulum vibration absorbers ; Nonlinear aspects of the performance of centrifugal pendulum vibration absorbers
Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1963.
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Improving the design of travelling wave type sloshing absorbers
Liquid sloshing absorbers are simple structures consisting of a partially full container of liquid with a free surface. The primary objective of this thesis is to investigate the potential to improve the design of rectangular sloshing absorbers through attaching surface roughness elements …
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Design Methodology of Electromagnetic Shock Absorbers for Vehicle Suspensions
L'abstract è presente nell'allegato / the abstract is in the attachment
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Optomechanical Devices and Sensors Based on Plasmonic Metamaterial Absorbers
… magnify light-matter interactions. Optical absorbers based on plasmonic metamaterials can absorb light resonantly at the operating wavelengths with up to 100% efficiency. We have explored plasmonic absorbers at infrared wavelengths for thermal detectors, e.g. a gold nanostrip antenna …
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Triphenylmethylium-Based Multitopic Two-Photon Absorbers: Synthesis and Characterization
… to confirm their potential as two-photon absorbers, which was established thanks to Z-scan measurements. Organometallic compounds bearing electron-releasing groups such as «Fe(η5-C5Me5)(κ2-dppe)C≡C−» , « Ru(Cl)(κ2-dppe) 2C≡C− » or ethynylferrocene were then synthesized and fully …
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Triphenylmethylium-Based Multitopic Two-Photon Absorbers: Synthesis and Characterization
… to confirm their potential as two-photon absorbers, which was established thanks to Z-scan measurements. Organometallic compounds bearing electron-releasing groups such as «Fe(η5-C5Me5)(κ2-dppe)C≡C−» , « Ru(Cl)(κ2-dppe) 2C≡C− » or ethynylferrocene were then synthesized and fully …
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Aluminum nitride microelectromechanical infrared detectors with integrated metamaterial absorbers
… (MEMS) AlN resonators. Historically, uncooled absorbers have been limited in two key metrics: selectivity, the ability to distinguish distinct wavelengths of incident light, and sensitivity, the ability to detect low level amounts of radiation. In recent years, research has been done on …
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Vibration reduction of marine cable systems using dynamic absorbers
Thesis (Nav. E.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1996.
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Influence of dynamic absorbers on a three dimensional truss
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1994.
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The variability of warm absorbers in Active Galactic Nuclei
This thesis presents three studies of warm (photoionized) absorber variability in Active Galactic Nuclei (AGN) using high-resolution X-ray spectra provided by the Chandra High Energy Transmission Grating (HETG). The first study is a single observation of the AGN MR 2251-178, which is known to have …
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Design of effective traveling wave sloshing absorbers for structural control
… to the understanding of rigid liquid sloshing absorbers with shallow depths, in structural control applications. An effective means of using intentionally induced liquid sloshing to control low frequency, transient structural oscillations is presented, establishing the sloshing absorber as an …
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A Hierarchical Noise Control System Using Adaptable Tuned Vibration Absorbers
… is developed using adaptable tuned vibration absorbers (ATVA) to interact with a vibrating host structure in such a way as to reduce radiated acoustic energy. ATVA's are single-degree-of-freedom resonant devices that can change their resonant frequency and damping over a range. This ATVA noise …
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Vibration simulation of a simply-supported beam with attached multiple absorbers
… by adding a single absorber and multiple absorbers to see the average percentage reduction in vibration’s amplitude. The over-all reduction achieved for multiple absorbers is 88.6% compared to a single absorber which only achieved 8.21% reduction. Finally, it can be concluded that multiple …
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