News

Numerical Analysis and Tuned Damping of a Floor System

In order to design and specify vibration abatement solutions (via tuned damping) for a multi-bay floor system, a reasonably accurate knowledge of the dynamic attributes of that floor system is required. These can be evaluated numerically (using finite element analysis) and verified experimentally by vibration measurement. Finite element modal analysis allows for the prediction of […]

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Vibration Control of an Office Floor System Using Tuned Mass Dampers

Following the occupants’ (office workers’) complaints about the floor vibration at a certain area in an office building, vibration measurements were conducted by an acoustics consulting firm, the results of which indicated that the floor system was lightly damped and that the vibration associated with occupant activities (mainly walking) was exacerbated by resonant amplification of […]

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Publication on Tuned Damping of a Balcony System

Cantilevered structures, such as balconies, when subject to human activity such as walking and jumping, can be susceptible to levels of vibration that may be deemed annoying by some users. If the structure is an irregular shape, the affected areas can often be fairly localized, with the rest of the space performing appropriately. Traditional approaches […]

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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 […]

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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 […]

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Vibration Control of Joist Framed Floors Using Tuned Mass Dampers

DEICON 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 […]

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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 […]

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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 […]

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Active Feedback-Controlled Boom Noise Damping/Absorption in Large Vehicles

Large vehicles, such as SUVs (Sport Utility Vehicle) and minivans, exhibit body boom phenomena during multiple source excitation events including rough road/impact and powertrain induced events. The main cause of the boom is the low-frequency acoustic/vibro-acoustic modes of the cavity being excited via the high acoustic transfer functions at multiple paths, due to an inherently […]

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Vibration Isolation of Large Transformers

In a recent application, DEICON was asked to further improve the structure-borne noise reduction of two large transformers (9000 pounds, each) installed in a multi-story residential building. The transformers were housed in sound proofed rooms and isolated from the floor via mounts (compressed fiberglass mounts for one transformer and cork/neoprene mats for the other). In […]

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