Webinar titled ‘Using Tuned Mass Dampers to Control Floor Vibration’

Walking, amongst other Human activities, is the most common cause of floor vibration that can lead to nuisance in building occupants. Walking-induced floor vibration can cause discomfort in people working or living in the building. Adding architectural features, mass and/or stiffness are commonly viewed as possible solutions to floor vibration problem. Such solutions are costly to install and architecturally unattractive in a new building and difficult to implement in, and cause inconvenience and disruption to the occupants of, existing buildings. An attractive alternative to the above-mentioned solutions for mitigating floor vibration is adding tuned damping to the floor by installing tuned mass dampers (TMDs). Negligible weight penalty, low cost, and ease of installation make tuned mass dampers (TMDs) the most practical, cost-effective, and least disruptive floor vibration control solution for both new and existing floor systems.

DEICON presented a webinar, thru the SE University, titled ‘Using Tuned Mass Dampers to Control Floor Vibrations’ in which the use of tuned damping in reducing the vibration of floor systems was discussed. In the webinar, following a short introduction to floor vibration and commonly used vibration mitigation practices, the concept of tuned damping was discussed. The session continued with the introduction of tuned mass dampers including their make-up, optimal design, and installation. After reviewing case studies, the design of tuned mass dampers for a floor system were demonstrated. The session concluded with a brief discussion of other applications of tuned mass dampers.

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Air Suspended ‘Adjustable Tuned Mass Damper’ Patent

DEICON recently received the ‘Notice of Allowance’ and ‘Notice of Allowability’ from the U.S. Patent and Trademark Office allowing the claims listed in DEICON’s air suspended ‘adjustable tuned mass damper’ patent application. In these tuned mass dampers, only air springs are used as the suspension elements. Active control enables the air springs to provide both damping adjustability and stiffness adjustability and thus be used as both the resilient element (spring) and energy dissipating element (viscous damper). Fine-tuning and re-tuning of air suspended adjustable tuned mass dampers can readily be accomplished thru the software, using their active and semi-active stiffness control features, without physically modifying the hardware. Moreover, self-tuning capabilities can be incorporated into the controller of air suspended tuned mass dampers so that they continuously and automatically fine-tuned themselves to the target frequency.

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Vibration Control of Joist Framed Floors Using Tuned Mass Dampers

vibration-controlDEICON was called upon to develop a tuned damping solution to mitigate floor vibrations across a variety of rooms inside an educational facility. The make-up of the impacted floors was concrete on metal deck, supported by open-web bar joists. The floors came in various sizes and shapes (rectangular, trapezoidal, and irregular), with the first resonant frequencies in the 6.5-7.5 Hz range.

DEICON designed and fabricated tuned mass dampers (TMDs) to address the vibration challenges with the floors. The TMDs were tuned to the natural frequencies of the first vibration modes of the floors they were designed for. The tuned mass dampers added substantial damping to the floors bringing their vibration to acceptable levels. More

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Combustion Instability Mitigation

The combustion instability (thermoacoustic instability) of a gas-fired combustor with a low-frequency instability occurring at 100 Hz, was successfully mitigated using DEICON’s passive acoustic radiation based tuned absorber (damping system). Contrary to the more traditional tuned acoustic absorbers (perforated liners, quarter wave tubes, etc.) that are objectionably large at such low frequencies, DEICON’s passive acoustic radiators are small in size and highly effective in providing tuned acoustic damping at low frequencies. In applications that the unstable frequency varies with time, depending on the operating conditions of the combustion system, DEICON promotes active acoustic damping solutions. More

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Balcony Floor Vibration Abatement Using Tuned Mass Dampers

Excessive vibration of three large balconies in a performing art center were dampened using tuned mass dampers (TMDs). Nine TMDs were designed and built for the three balconies (three/balcony) and appended to the vibrating structure at locations where they can most effectively couple with the target mode(s).

The TMDs, tuned to the balcony resonant frequencies of 6 Hz and 9 Hz, added the required damping to the balconies to bring their vibration to acceptable levels. More

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