The 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 MoreA small room is used to evaluate how DEICON’s patented, active acoustic damping technology, ‘electronic bass trap’, enhances low-frequency musical articulation in that room The rectangular room has a dominant coloration due to the 32 Hz standing wave that shapes up along its length. Electronic bass trap is used to add damping to the first […]
Read MoreProof mass actuators (PMAs) are used to add tuned damping and tuned dynamic absorption to test structure as well as the rear sub-frame of an all-wheel-drive vehicle. The choice of active vibration control strategy, with a PMAs as the actuator, depends on whether the PMA’s natural frequency is placed below or within the frequency(ies) of […]
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 […]
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