Tuned mass dampers (TMDs) were used to abate resonant vibration of the floor system induced by the rhythmic (dancing) perturbation at an upscale intimate concert venue/night club. The composite floor system is made up of 2.5” lightweight concrete on 3” deep, 20 gauge steel deck supported by wide flange steel beams and girder framing. The […]
Read MoreTuned mass dampers (TMDs) are tuned damping devices commonly used for dampening the vibration of a structure at a particular resonant frequency. TMDs come in various configurations. The commonality between all of them is their make-up which includes an inertia element (mass) suspended by an energy dissipating (damping) device and a restoring (resilient) element. Foot […]
Read MoreFloor Vibration Control Using Tuned Mass Dampers Tuned mass dampers (TMDs) are tuned damping devices commonly used for dampening the vibration of a structure at a particular resonant frequency. TMDs come in various configurations. The commonality between all of them is their make-up which includes an inertia element (mass) suspended by an energy dissipating (damping) […]
Read MoreTuned mass dampers (TMD) are highly effective and tunable passive vibration damping treatments. These devices are damped 2nd order systems appended to a vibrating structure; see Figure 1. Proper selection of the parameters (mass, stiffness, and damping) of a tuned mass damper, tunes the TMD to one of the natural frequencies of the underdamped flexible […]
Read MoreThe airframes of some airplanes are equipped with a number of tuned vibration absorbers tuned the propeller blade passage frequency, to cancel out the noise and vibration and keep the cabin quiet and comfortable. A number of the DVAs in a private airplane were removed from the airframe, disassembled and their leaf springs refurbished. Following […]
Read MoreViscoelastic tuned mass dampers (TMDs) use viscoelastic (VE) material as the suspension element, in such a way that the material exhibits the functionality of both the energy dissipation device (viscous) and the restoring device (elastic). These tuned mass dampers are in general less costly than the more commonly used TMDs employing viscous dampers and springs […]
Read MoreA novel, feed-forward vibration isolation scheme is developed that addresses the shortcomings of adaptive feedforward vibration isolation algorithms. This scheme which is based on the use of Kalman estimators (KE) does not require real-time adaptation and yet maintains its effectiveness when the attributes (such as the frequencies) of the disturbance changes. More importantly, it does […]
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