Resonant passive–active vibration absorber with integrated force feedback control

Abstract

A general format of a two-terminal vibration absorber is constructed by placing a passive unit in series with a hybrid unit, composed of an active actuator in parallel with a second passive element. The displacement of the active actuator is controlled by an integrated feedback control with the difference in force between the two passive elements as input. This format allows passive and active contributions to be combined arbitrarily within the hybrid unit, which results in a versatile absorber format with guaranteed closed-loop stability. This is demonstrated for resonant absorbers with inertia realized passively by a mechanical inerter or actively by the integrated force feedback. Accurate calibration formulae are presented for two particular absorber configurations and the performance is subsequently demonstrated with respect to both equal modal damping and effective response reduction.

Active tuned inerter-damper for smart structures and its ℋ∞ optimisation

“…This can be done by substituting Eqs. (14) and (15) into Eq. (13) and equating the resulting expressions for g sn ¼ 0, one obtains,…”

“…Høgsberg et.al. [14] proposed to realise active inerter-damper systems using reactive actuators and force sensors. Reactive actuators are referred to as vibration actuators that are often used for smart structure applications, such as moving coil electrodynamic, magnetostrictive, piezoelectric, variable reluctance actuators, etc.…”

Design of a hybrid proportional electromagnetic dynamic vibration absorber for control of idling engine vibration

“…To the best of authors' knowledge, there are few controllable actuators such as piezoelectric, 4 magnetostrictive, 5 electrodynamic, [6][7][8] and electromagnetic actuators. 9 The piezoelectric actuators do not offer sufficient travel of the reaction mass required to generate an appropriate level of force, and the magnetostrictive actuators exhibit considerable modeling complexities and uncertainties in the active force.…”

“…In this study, the design of an electromagnetic actuator is proposed to minimize the sensitivity of the force to variations in the air gap and thereby nearly symmetric driving force. Figure 4(a) illustrates the design of the electromagnet comprising the iron core (1), the coil (2), the armature (3), and the nonpermeable material shaft/bolt assembly (4) for its mounting to the primary system together with the base structure (5). The armature and core structures are designed with concentric rings with a fixed air gap between them, as seen in Figure 4(b).…”

Theoretical Study on a Cable-Bracing Inerter System for Seismic Mitigation

“…Since then, various inerter-based devices have been developed, including tuned viscous mass dampers (TVMD) [9,21], tuned mass-damper-inerter systems (TMDI) [12], tuned inerter dampers (TIDs) [22], and so on. These inerter-based devices use rack pinion [22][23][24], ball screw [9,25], hydraulic [26][27][28] and electromagnetic [29][30][31] mechanisms to convert translational movement into rotational movement.…”