Enhancement of energy harvesting using acoustical-black-hole-inspired wave traps

Abstract

The purpose of this paper is to highlight the interest of associating smart functionalities in the same smart-structure. It consists in combining a wave trap device with an energy harvester on a beam. Both functions are performed using piezoelectric transducers. The wave trap device is based on the acoustical black hole concept. It is designed to generate a gradual modification of the equivalent composite Young's modulus along the beam. The aim is to concentrate the mechanical energy at the beam center where the harvesting device is placed. To achieve this, a network of transducers is used. The transducers are shunted on a specific negative capacitance. The harvester device is made of a simple piezoelectric patch associated with a classical extracting circuit. A significant increase in harvested energy is observed using this association for both weak and strong coupling. From the practical viewpoint, the study also highlights the sensitivity of the structural behavior, which strongly depends on the tuning of the trap device.

Realization of an autonomous virtual acoustic black hole with piezoelectric patches

“…where η is the vector of generalized control coordinates, I is the identity matrix and Ω is a diagonal matrix comprising the eigenfrequencies. Substituting x by αη in (21), projecting the equations along α and using (22) yields…”

“…The idea to reproduce digitally the properties of an ABH to trap the energy was proposed in [21]. The wave compression property was also mimicked in [22].…”

Numerical realization of a semi-active virtual acoustic black hole effect

“…An inevitable condition for ABH geometries is that the host structure must be large enough to allow carving out the power law profile which is a limitation in vehicle and aero applications (Ji et al, 2018;Park et al, 2019). This constraint is overcome partially by using ABH-inspired active electronic dampening in conjunction with the force-current electric analogy by Maugan et al (2019).…”

Topological interface states by energy hopping within power-law variable section waveguides

“…In recent years, variable cross-section structures, especially power-law structures, have attracted increasing attention in the structural design for vibration and noise control [1][2][3], energy concentration and harvesting [4][5][6][7][8], and wave manipulation [9,10]. In contrast, the combination of variable cross-sectional structure and phononic crystals (PC) has also garnered much popularity in vibration suppression [11][12][13], sound absorption [14], and wave manipulation [15,16].…”