Abstract
A novel dynamic vibration absorber (DVA) configuration is introduced for simultaneous vibration suppression and energy harvesting from oscillations typically exhibited by large-scale low-frequency engineering structures and structural components. The proposed configuration, termed energy harvesting-enabled tuned mass-damper-inerter (EH-TMDI) comprises a mass grounded via an in-series electromagnetic motor (energy harvester)-inerter layout, and attached to the primary structure through linear spring and damper in parallel connection. The governing equations of motion are derived and solved in the frequency domain, for the case of harmonically-excited primary structures, here modelled as damped single-degree- of-freedom (SDOF) systems. Comprehensive parametric analyses proved that by varying the mass amplification property of the grounded inerter, and by adjusting the stiffness and the damping coefficients using simple optimum tuning formulae, enhanced vibration suppression (in terms of primary structure peak displacement) and energy harvesting (in terms of relative velocity at the terminals of the energy harvester) may be achieved concurrently and at nearresonance frequencies, for a fixed attached mass. Hence, the proposed EH-TMDI allows for relaxing the trade-off between vibration control and energy harvesting purposes, and renders a dual-objective optimisation a practically-feasible, reliable task.
Highlights
The concept of the linear tuned mass-damper (TMD) is historically one of the first and most widely used strategies for passive vibration mitigation of harmonically-excited mechanical and civil engineering structures [1,2,3]
There is a design trade-off between the above objectives which depends heavily on the attached TMD mass. Aiming to solve this issue, this paper proposes a novel configuration for simultaneous vibration suppression and energy harvesting for harmonically-excited structures, modelled as damped single-degree-of-freedom (SDOF) dynamic systems in which the available amount of energy to be harvested and the achieved level of vibration suppression as evaluated in the mechanical domain do not have an inverse proportional relationship
Built on the tuned mass-damper-inerter (TMDI) concept, this study considers the energy harvesting-enabled tuned massdamper-inerter (EH-TMDI) configuration shown in Fig. 1c for simultaneous vibration control and energy harvesting from force-induced oscillations of the primary structure
Summary
The concept of the linear tuned mass-damper (TMD) is historically one of the first and most widely used strategies for passive vibration mitigation of harmonically-excited mechanical and civil engineering structures [1,2,3] It relies on attaching an additional free-to-vibrate mass to a primary or host structure, whose motion is to be suppressed, via a linear spring/stiffener in parallel with a dashpot (e.g., a linear viscous damper). [12, 14]), which are able to transform part of the kinetic energy of the primary structure into electric energy via appropriate energy harvesting and storage circuitry [13,15] In this context, a tuned mass-damper/harvester (TMD/H) control configuration is proposed in [13], where an electromagnetic motor consisted of a magnet travelling within a constant magnetic field was considered, along with a linear spring and a damper, to link the attached mass to the primary structure. An energy harvesterdynamic vibration absorber (EH-DVA) configuration is employed in [14], in which electric energy is generated from strains developed in layers of piezoelectric material mounted onto the attached vibrating mass of a TMD
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