Dynamic Vibration Absorber

About: Dynamic Vibration Absorber is a research topic. Over the lifetime, 4764 publications have been published within this topic receiving 49429 citations.

Isolation of bending vibration in a beam structure with a translational vibration absorber and a rotational vibration absorber

Abstract: One drawback of the traditional dynamic vibration absorber is that it can only absorb the vibration of a continuous structure such as a beam at the point to which it is attached. In this article, it is proved that if damping in a vibrating beam structure is negligible, a translational dynamic absorber used in combination with a rotational dynamic absorber can absorb both translational and rotational motions for part of a vibrating beam subjected to harmonic excitation. An analytical model based on Euler-Bernoulli beam theory is constructed for a beam under partially distributed loading, and it is proved theoretically that the two absorbers can not only absorb vibration in the unforced portion of the beam, but can also isolate vibration in the portion under direct excitation. Two numerical examples are given for illustration, and some useful applications of the absorbers are discussed.

Electronic percussion instrument

Abstract: A baseplate carries on its surface a pad constituting a strike surface and a tubular rim surrounding the pad and constituting a strike ring A pad sensor is provided on the surface of the baseplate in the central area thereof for detecting the vibration of the baseplate caused by a strike on the pad, and a rim sensor is provided between the rim and the baseplate for detecting the vibration of the rim The electric signals representing the detected vibrations trigger the generation of tone signals of drum sounds The baseplate is supported via vibration absorber pieces on a support frame Thus, disturbing vibrations externally given to the support frame will be prevented from propagating up to the baseplate, being absorbed by the vibration absorber pieces

Numerical studies on passive suppression of one and two degrees-of-freedom vortex-induced vibrations using a rotative non-linear vibration absorber

Abstract: This paper presents a numerical investigation on the use of a rotative non-linear vibration absorber (NVA) as a passive suppressor for the vortex-induced vibrations phenomenon (VIV) The structural model consists of rigid cylinders mounted on elastic supports and the hydrodynamic loads are calculated using phenomenological models The NVA is defined as a rigid bar, fitted with a tip-mass and hinged to the cylinder Energy is dissipated by means of a linear dashpot linked to the bar Two major groups are studied, the first one being that in which the cylinder is constrained to oscillate in the cross-wise direction (1-dof VIV) The second group, herein named 2-dof VIV, refers to the condition in which simultaneous oscillations in the cross-wise and in-line directions are allowed Characteristic oscillation amplitude curves are obtained as functions of reduced velocities covering the lock-in for different values of the control parameters that define the NVA (namely, its mass, radius and dashpot constant) In addition, quantitative and qualitative aspects of cylinder and suppressor responses are explored in the form of colormaps defined in the space of control parameters for three specific reduced velocities The systematic study shows that the mass parameter of the NVA has more influence on the VIV suppression for both 1-dof VIV and 2-dof VIV In general, the suppression has proved to be greater in the 1-dof VIV case

Tuned damping means for increasing the minimum dynamic stiffness of a spindle system

Abstract: The minimum dynamic stiffness of a milling cutter and its holder, which form a spindle system, is increased by disposing a tuned damped vibration absorber, which comprises a damping mass supported by a viscoelastic material element, within the milling cutter. The element of viscoelastic material is retained within the damping mass by retaining means.