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.

Chatter mitigation using the nonlinear tuned vibration absorber

Abstract: A passive vibration absorber, termed the nonlinear tuned vibration absorber (NLTVA), is designed for the suppression of chatter vibrations. Unlike most passive vibration absorbers proposed in the literature for suppressing machine tool vibrations, the NLTVA comprises both a linear and a nonlinear restoring force. Its linear characteristics are tuned in order to optimize the stability properties of the machining operation, while its nonlinear properties are chosen in order to control the bifurcation behavior of the system and guarantee robustness of stable operation. In this study, the NLTVA is applied to turning machining.

Damped dynamic vibration absorber

Abstract: A pump is disclosed having a damped dynamic vibration absorber for attenuating pump vibration in response to a periodic disturbing force generated when the pump is in operation. The vibration absorber comprises elastic means, an annular mass and an energy dissipative means. The elastic means are arranged around the pump in a plane generally normal to the axis of rotation having one end secured to the pump and one end free to vibrate relative to the pump. The annular mass is secured to the free end and the energy dissipative means comprising a squeeze film damper is secured to the annular mass. The annular mass has a predetermined mass, and the elastic means have a predetermined stiffness and the squeeze film damper has a predetermined damping ratio such that the absorber generates a compensating force acting on the pump out of phase with a periodic disturbing force which acts on the pump and is generated while the pump is operated. The effect of the compensating force is to attenuate vibration of the pump which would otherwise occur as a result of the periodic disturbing force.

A Comparison between Electrorheological and Magnetorheological Fluids Subjected to Impulsive Loads

Abstract: This paper is concerned with an experimental comparison of the dynamic performance of an Electrorheological and a Magnetorheological fluid when subjected to impulsively applied loads. The ER device was built as a squeeze cell incorporating an ER fluid sandwiched between two electrodes which, during impact, move towards each other, whilst the MR device was a commercially available vibration absorber. Each device was mounted in an experimental rig which was capable of determining the instantaneous responses of the fluids. The transient characteristics of the devices were assessed for various mechanical force levels and, for the ER device, under DC excitation of the fluid in conjunction with a digital controller to provide a constant applied electrical field.

On vibration mitigation and energy harvesting of a non-ideal system with autoparametric vibration absorber system

Abstract: This paper demonstrates that vibration mitigation and energy harvesting can be achieved simultaneously by using of an electricity-generating from autoparametric vibration absorber system (AVAS) and non-ideal system (NIS) The NIS consists of a simple portal frame excited by a small dc motor with eccentric mass, with limited power supply and located on the top The AVAS consists of a cantilever beam with tip mass parallel coupled to NIS A piezoelectric material is considered for energy harvesting installed in the base of the AVAS and an electric circuit is connected to the piezoelectric material in order to produce voltage output Several numerical simulations were carried out focusing on the passage through the resonance of NIS, when the motor rotational frequency is near the portal frame natural frequency and when the non-ideal subsystem frequency is approximately twice the absorber beam frequency (two-to-one internal resonance) The results showed the existence of Sommerfeld effect in NIS and saturation phenomenon in the NIS–AVAS