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 25 for “"tuned mass dampers"”.
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Semi-Active Control of Air-Suspended Tuned Mass Dampers
… One such method for abating the vibration is tuned mass damping.In this dissertation, semi-active control of air-suspended tuned mass dampers with pendulum configuration was explored. A novel semi-active Air Sprung PTMD was designed, built, and evaluated, analytically and experimentally. The …
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The use of tuned mass dampers to control annoying floor vibrations
… is difficult and can be expensive. The use of tuned mass dampers to control annoying floor vibrations is sometimes a viable solution. Tuned mass dampers (TMDs) have been used primarily to control only one or two modes of vibration of a floor. Experimental research was performed using prototype …
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Design of multi-degree-of-freedom tuned-mass dampers using perturbation techniques
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2003.
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Dynamic range implications for the effectiveness of semi-active tuned mass dampers
… traditional solution is the implementation of a tuned mass damper (TMD), which acts as a passive damping device in the region of the tuned frequency. However, TMDs exhibit a limited bandwidth and often require a significant mass. Active systems, such as the active mass driver, have been utilized …
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Seismic performance, design and placement of multiple tuned mass dampers in building applications
<p>"Extensive investigations have indicated that tuned mass dampers (TMD) are not very effective for seismic applications. One of the reasons is that both the fundamental and higher vibration modes may play important roles in the seismic responses of building structures while the conventional …
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Application of Magneto-Rheological Dampers in Tuned Mass Dampers for Floor Vibration Control
… research is to establish the effectiveness of tuned-mass-dampers (TMD) using semi-active magneto-rheological (MR) dampers to mitigate annoying floor vibrations. Annoying floor vibration is becoming more common in today's building structures since building materials have become stronger and …
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Structural systems and tuned mass dampers of super-tall buildings : case study of Taipei 101
The design of the first generation of skyscrapers was based on strength. Heavy masonry cladding and wall curtains used at that period added a considerable amount of stiffness and damping to the structure. Inter-storey drifts and peak accelerations were relatively small. Advances in the material …
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Element and system design for active and passive vibration isolation
… ground transmission at high frequency, but tuned-mass dampers are decoupled from the ground. We explore the tuned-mass damper as a passive realization of the skyhook damper, obtain the optimal designs for multiple-SDOF systems of dampers, propose the concept of a multi-DOF damper, and show …
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High amplitude response behavior of a linear oscillator-nonlinear absorber system: Identification, analysis, and attenuation by using a semi-active absorber in series
… structure"). The simplest auxiliary absorber, a tuned mass damper (TMD), provides reliable narrow-band attenuation but is not robust to the effects of detuning. Strongly nonlinear tuned mass dampers (NTMDs) are capable of wide-band, irreversible energy transfer known as "energy pumping" but can …
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Vibration analysis and control of dynamics effects of moving vehicles over bridges
… moving vehicles, vibration control devices such Tuned Mass Dampers (TMD) and Multiple Tuned Mass Damper (MTMD) are presented. Results from different authors are included, which allow assessing the applicability and effectiveness of these methods.
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Innovative System for Seismic Control Strategies
… installing auxiliary damping devices such as tuned mass dampers (TMDs) is a very reliable solution to mitigate wind-induced vibration of tall buildings. However, regardless of the different distribution strategies, installing TMD systems means adding additional masses to tall buildings. A …
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Granular sloshing absorbers for vibration control
… Current passive damper technologies include Tuned Mass Dampers and Tuned Liquid Dampers. These devices provide optimal damping at the natural frequency of the structure. This thesis proposes a novel passive damping device, that uses a granular material sloshing in a rotating cylindrical …
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Dynamic interrelationship between technology and architecture in tall buildings
… control using double skin facades / distributed tuned mass dampers. Design integration among architecture-related disciplines is emphasized throughout the research process as a means to more effectively overcome or at least minimize contemporary technological limitations and to create …
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Heating effects on magnetorheological dampers
… are currently used such as viscous, friction or tuned mass dampers; however, one of the most recent promising systems proposed is the Magnetorheological damper (MR damper). Because of their ability to be controlled and to adapt their mechanical properties by varying a magnetic field, their high …
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Towards A Mobile Damping Robot For Vibration Reduction of Power Lines
… are used for maintenance efforts while fixed tuned mass dampers (FTMDs) are used to prevent structural damages. However, both solutions are facing many challenges. Inspection robots are limited by their size and considerable power demand, while FTMDs are narrowband and unable to adapt to …
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Mitigation of wind induced movement of buildings using the modified friction device
… of high-rise buildings to wind excitation. Tuned mass dampers are usually used to limit the response of the buildings to wind. However, these devices are generally tuned for a particular bandwidth of frequencies. Therefore, in order to improve the effectiveness of these devices, control …
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Vibration Reduction of a Semisubmersible Floating Wind Turbine using Optimized Tuned Mass and Tuned Inerter Dampers
… wind turbines. Models are developed adding tuned mass dampers (TMD) and tuned inerter dampers (TID) into the three main columns of a semisubmersible platform. Results showed that for free decay tests, heave and pitch root mean square (RMS) values were reduced significantly by the addition of …
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Optimal control with structure constraints and its application to the design of passive mechanical systems
… systems, such as multi-degree-of-freedom tuned-mass dampers, passive vehicle suspensions, and others.
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Vibration Reduction and Energy Harvesting using Motion-Rectified Tuned Mass-Damper-Inerters in Semi-Submersible Offshore Wind Platforms
… structures. This paper compares traditional tuned-mass dampers (TMDs) and tuned-mass damper inerters (TMDIs) with a nonlinear TMDI which utilizes a mechanical motion rectifier (MMR) to translate bidirectional to unidirectional motion of the primary generator shaft. The integration of the MMR …
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Multi-resonant Electromagnetic Shunt in Base Isolation for Vibration Damping and Energy Harvesting
… shunt was compared with traditional multiple tuned mass dampers (TMDs) applied to the base isolation system. It shows that, for multiple TMDs and multi-resonant electromagnetic shunt dampers with 5% total stiffness ratio, the parallel shunt electromagnetic shunt can achieve the best vibration …
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