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.

Order-Tuned Vibration Absorbers for Cyclic Rotating Flexible Structures

Abstract: This paper investigates the use of order-tuned absorbers to attenuate vibrations of flexible blades in a bladed disk assembly subjected to engine order excitation. The blades are modeled by a cyclic chain of N oscillators, and a single vibration absorber is fitted to each blade. These absorbers exploit the centrifugal field arising from rotation so that they are tuned to a given order of rotation, rather than to a fixed frequency. A standard change of coordinates based on the cyclic symmetry of the system essentially decouples the governing equations of motion, yielding a closed form solution for the steady-state response of the overall system. These results show that optimal reduction of blade vibrations is achieved by tuning the absorbers to the excitation order n, but that the resulting system is highly sensitive to small perturbations. Intentional detuning (meaning that the absorbers are slightly over- or under-tuned relative to n) can be implemented to improve the robustness of the design. It is shown that by slightly undertuning the absorbers there are no system resonances near the excitation order of interest and that the resulting system is robust to mistuning (i.e., small random uncertainties in the system parameters) of the absorbers and/or blades. These results offer a basic understanding of the dynamics of a bladed disk assembly fitted with order-tuned vibration absorbers, and serve as a first step to the investigation of more realistic models, where, for example, imperfections and nonlinear effects are considered, and multi-DOF and general-path absorbers are employed.Copyright © 2005 by ASME

Reduction of wind-tunnel-model vibration by means of a tuned damped vibration absorber installed in the model

Abstract: Wind tunnel model vibration reduced by use of tuned vibration damping absorber on aircraft model

Parametric Analysis of Magnetorheologically Damped Pendulum Vibration Absorber

Abstract: This paper presents numerical and experimental study of an autoparametric pendulum absorber attached to a vertically moving Duffing oscillator. The absorber can be highly efficient for slightly damped systems, when correctly tuned. In the suspension of pendulum absorber, the magnetorheological damper (MR) is installed to allow control. The influence of system parameters: Viscous and magnetorheological damping, stiffness of the spring, parameter which couples both systems on the suppression effectiveness are studied. Additionally, the influence of system parameters on periodic solutions and stability are analyzed using continuation techniques.

Belt or chain drive disc

Abstract: The disc comprises an input part (3) and an output part (4) coupled for rotation by a damping device (5( with circumferentially compressible energy accumulators, such as coil compression springs (9). The input and output parts are mounted rotatable relative to each other by a bearing (26). A vibration absorber has an absorber mass (29) connected to the same shaft as the drive disc vias a damper (28) of elastomer, connected to absorber input part (24). Absorber input part (24) may be fixed to radially inner area (22) of input part (3) either by screws or rivets. Cover cap (41) is provided to prevent dirt entering circular chamber (8) which is partially filled with a viscous medium. To prevent overheating, axial apertures (42) are provided.