Posts Tagged with Engineering

One-Order Tuned Vibration Absorption of a Diesel-Generator

In four stroke engines, including diesel engines driving generators, each cylinder fires every other revolution. This causes the engine vibration to occur at ½ the engine RPM, called the ½ order vibration, and its higher order harmonics namely 1 order, 1½ order, 2 order. In the case of a diesel generator, in addition to the […]

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Vibration Control of an Overlook Using Tuned Mass Dampers

Hunter’s Point South Park is a breath-taking waterfront park located on the edge of the East River, in Western Queens, NY. The focal point of the park is Hunter’s Point South overlook, a beautiful cantilevered platform that offers unobstructed views of the New York skyline. The Overlook’s rather low fundamental frequency (3.5 Hz) combined with […]

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Vibration Control of Long Span Balcony Using a Tuned Mass Damper

Excessive vibration of a long span balcony (mezzanine) in an upscale residence was addressed by using a tuned mass damper tuned to the natural frequency of the first structural mode of the balcony. The TMD was sized to have the nominal active mass of 450 Kg. The depth and height of the TMD were chosen […]

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Balcony Vibration Control Using Tuned Mass Dampers

The irregular shape of three large, 1200 square feet, cantilevered balconies in a high-profile performing arts center resulted in areas at the balcony tip and edge susceptible to potentially annoying levels of vibration. To mitigate this effect, the building designers added tuned mass dampers to the underside of each of the three balconies. Following the […]

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Multi-mode vibration Control of a Floor System Using Tuned Mass Dampers

The composite floor system of a large multipurpose room on the third floor of the admission building at a state university exhibited noticeable vibration caused by walking. The composite floor system consists of three long and narrow bays. The vibratory attributes of the floor system established by numerical analyses and measurement revealed the presence of […]

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Flame Instability (Combustion-driven Oscillation) Mitigation

The performance of modern combustion systems including fuel efficiency, emissions, pattern factor, and lean flammability limit depend on the mixing process between the combustion air and the fuel. For proper mixing, modern combustors rely on a combination of large and small scale turbulent eddies and vortices to control mixing, fuel droplet dispersion (for liquid fuel), […]

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