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 17 of 17 for “"Passive vibration"”.
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Passive vibration isolators with high-static-low-dynamic-stiffness
… there is need to reduce the level of vibrations that are transmitted from a source to a receiver. Amongst several different techniques, the most commonly adopted solution is to interpose an isolation mount between the source and the receiver. Ideally, a vibration isolation mount would …
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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 Single-Stage Passive Vibration Isolation System for Scanning Tunneling Microscopy
… surface, the device is prone to noises due to vibrations from the surroundings. To minimize the random noises and floor vibrations, passive vibration isolation is a commonly used technique due to its low cost and simpler design compared to active vibration isolation, especially when the entire …
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An Investigation of the Feasibility of Microscale Adaptive Passive Vibration Neutralizers
This thesis concerns the control of an adaptive passive vibration neutralizer and the feasibility of miniaturizing this type of tunable vibration neutralizer for small-scale applications. An analytical model for the adaptive passive vibration neutralizer is derived and compared to experimental …
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A Distributed Active Vibration Absorber (DAVA) for Active-Passive Vibration and Sound Radiation Control
This thesis presents a new active-passive treatment developed to reduce structural vibrations and their associated radiated sound. It is a contribution to the research of efficient and low cost devices that implement the advantages of active and passive noise control techniques. A theoretical model …
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The tuned mass damper inerter for passive vibration control and energy harvesting in dynamically excited structural systems
A novel passive vibration control configuration, namely the Tuned-Mass-Damper-Inerter (TMDI) is proposed in this work. The TMDI combines the “inerter”, a mechanical two-terminal flywheel device developing resisting forces proportional to the relative acceleration of its terminals, with the …
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Effect of Passive Vibration on Skin Blood Flow in Good Glycemic Control and Poor Glycemic Control Type 2 Diabetics
… in type 2 diabetics (T2D). In research, passive vibration (PV) was effective in increasing skin blood flow (SBF) in healthy individuals as well as in good to fair glycemic control T2D. There has been no study performed to examine the effect of PV on (SBF), skin temperature (ST) and blood …
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Theoretical and Experimental Studies of Steady State Nonlinear Localization and Energy Pumping in Systems of Coupled Oscillators
… essentially nonlinear stiffness elements for passive vibration control can provide relatively simple, modular vibration isolation designs for engineering structures.
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Analysis of Buckled and Pre-bent Columns Used as Vibration Isolators
Vibrations resulting from earthquakes, machinery, or unanticipated shocks may be very damaging and costly to structures. To avoid such damage, designers need a structural system that can dissipate the energy caused by these vibrations. Using elastically buckled struts may be a viable means to …
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Optimal mode localization in disordered, periodic structures
… localization, offers an excellent option for passive vibration isolation. In the first part of the thesis, we provide analytical prediction of modes exhibiting moderate localization using a newly developed Jordan Block Perturbation Method. We estimate and compare convergence zones of our newly …
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The study and development of distributed devices for concurrent vibration attenuation and energy harvesting
… on the broadband attenuation of structural vibration and, in the process, employs a new perspective of vibrational energy harvesting devices. The first part of the research studies and develops a continuously distributed vibration control device which combines the benefits of point …
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An investigation of vibration isolation systems using active, semi-active and tunable passive mechanisms, with applications to vehicle suspensions
… investigation on active, semi-active and passive vibration control mechanisms is presented in order to achieve improved shock and vibration isolation of mechanical systems, especially ground vehicle applications. A hybrid active vibration isolation system, incorporating an electro-magnetic …
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Development of Precision, Field-Deployable, Opto-Mechanical Instrumentation: Accessibility as a Functional Requirement
… It is a tabletop, ultra-high vacuum compatible passive vibration isolation platform with active damping control. Its innovative architecture is demonstrated to meet the stringent requirements of gravitational-wave interferometers, advancing the field’s suspension technology to be simpler yet …
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Development of Novel Eddy Current Dampers for the Suppression of Structural Vibrations
… structure is deployed in space, it is subject to vibrations induced mechanically by guidance systems and space debris as well as thermally induced vibrations from variable amounts of direct sunlight. For the optimal performance of the satellite, it is crucial that the vibration of the membrane be …
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Two Dimensional Analysis of Vibration Isolation of Rigid Bar Supported by Buckled or Pre-bent Struts
… of this research is to study a new type of vibration isolator, utilizing the post-buckled stiffness of elastic struts (or columns). The advantage of the post-buckled state is that ideally it can support more static load with a relatively small static deflection than traditional vibration …
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Investigation of the Dynamic Performance of a Cable-Stayed Footbridge
… additional damping can be provided by passive dampers. However, amplitude dependent behaviour of dampers and slip in connections can make them effective only above a threshold amplitude. Hence, due to high uncertainties in the complex CSFB-damper system, usually, dynamic tests are …
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Novel Lightweight Noise and Vibration Control Treatments for Marine Structures
… the development and testing of distributed vibration absorber designs with specific application to heavy plates for the reduction of vibration and sound radiation. Two particular designs, already under investigation for use on thin panels or composite materials, were adapted to passively …