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.

Numerical Investigation of an Adaptive Vibration Absorber Using Shape Memory Alloys

Abstract: The tuned vibration absorber (TVA) is a well-established passive vibration control device for achieving vibration reduction of a primary system subjected to external excitation This contribution deals with the non-linear dynamics of an adaptive tuned vibra- tion absorber (ATVA) with a shape memory alloy (SMA) element Initially, a single-degree of freedom oscillator with an SMA element is analyzed showing the general characteristics of its dynamical response Then, the analysis of an ATVA with an SMA element is carried out Initially, small amplitude vibrations are considered in such a way that the SMA element does not undergo a stress-induced phase transformation Under this assumption, the SMA influ- ence is only caused by stiffness changes corresponding to temperature-induced phase trans- formation Afterwards, the influence of the hysteretic behavior due to stress-induced phase transformation is considered A proper constitutive description is employed in order to cap- ture the general thermomechanical aspects of the SMAs The hysteretic behavior introduces complex characteristics to the system dynamics but also changes the absorber response allow- ing vibration reduction in different frequency ranges Numerical simulations establish com- parisons of the ATVA results with those obtained from the classical TVA

Vibration insulation device for handle of vibratory machine

Abstract: A vibration insulation device for a handle of vibratory machine, which is characterized by comprising: a spring K adapted to be displaced in the direction of unidirectional vibration transmitted to the handle, and a dynamic vibration absorber consisting of a cantilevered spring Kd, a magnetic damper cd and a conductive weight plate md provided in the section m to be insulated. In case the vibration is directional, i.e. when the vibration is caused in X and Y directions, the above described unit consisting of the spring K and the dynamic vibration absorber is disposed for respective directions of vibration.

Piezoelectric vibration damping using resonant shunt circuits: an exact solution

Abstract: The objective of this paper is to propose an exact closed-form solution to the optimization of piezoelectric materials shunted with inductive-resistive passive electrical circuits. Realizing that Den Hartogʼs method which imposes fixed points of equal height in the receptance transfer function is approximate, the parameters of the piezoelectric tuned vibration absorber are calculated through the direct minimization of the maxima of the receptance. The method is applied to a one-degree-of-freedom primary oscillator considering various values of the electromechanical coupling coefficients.

Some recent developments in adaptive tuned vibration absorbers/neutralisers

Abstract: The vibration absorber has been used for vibration control purposes in many sectors of engineering from aerospace, to automotive to civil, for the past 100 years or so. A limitation of the device, however, is that it acts like a notch filter, only being effective over a narrow band of frequencies. Recent developments have overcome this limitation by making it possible to tune the device over a range of frequencies. This has been achieved by incorporating a variable stiffness element that can be adjusted in real-time. In this paper, some ways in which stiffness change can be achieved in practice are reviewed and some examples of prototype adaptive tuned vibration absorbers (ATVAs) are described. A simple control scheme to automatically tune an ATVA is also presented.