Active and passive vibration isolation in piezoelectric phononic rods with external voltage excitation

Abstract

Active piezoelectric materials are applied to one-dimensional phononic crystals, for the control of longitudinal vibration propagation both in active and passive modes. Based on the electromechanical coupling between the acoustical vibration and electric field, the electromechanical equivalent method is taken to theoretically predict the transmission spectrum of the longitudinal vibration. It is shown that the phononic rod can suppress the vibration efficiently at the frequencies of interest, by actively optimizing the motions of piezoelectric elements. In an illustrated phononic rod of 11.2cm long, active tunable isolations of more than 20dB at low frequencies (500Hz-14kHz) are generated by controlling the excitation voltages of piezoelectric elements. Meanwhile, passive fixed isolation at high frequencies (14k-63kHz) are presented by its periodicity characteristics. Finite element simulations and vibration experiments on the rod demonstrate the effectiveness of the approach in terms of its vibration isolation capabilities and tunable characteristics. This phononic rod can be manufactured easily and provides numerous potential applications in designing isolation mounts and platforms.

Review on Multiple‐Degree‐of‐Freedom Cross‐Scale Piezoelectric Actuation Technology

“…Zou et al [ 253 ] used a piezoelectric smart platform to actively isolate the low‐frequency broadband multidirectional vibration; the piezoelectric platform can isolate vibration from 0 to 3000 Hz in multiple directions under the coordination of the optimal control algorithm. Zhang et al [ 254 ] used a piezoelectric phononic rod to generate the active tunable isolations of more than 20 dB at low frequencies from 500 Hz to 14 kHz by controlling the excitation voltages of piezoelectric elements. Song et al [ 255 ] proposed an active‐passive vibration isolator including the active part of a piezoelectric actuator and the passive part of a damping buffer, which achieved vibration isolation from 5 to 500 Hz and solved the problem of high‐precision equipment's positioning and control accuracy.…”

Thermal tuning on band gaps of 2D phononic crystals considering adhesive layers

“…Since the concept of photonic crystals (PCs) first emerged in the early 1990s [1], PCs as a type of periodical structure have consisted of different constituents with a unique characteristic of forbidden band gaps [2][3][4][5], in which the elastic waves with certain frequencies cannot propagate, attracting much sub stantial attention. This special property provides PCs exten sive applications, including noise suppression [5][6][7][8], vibration isolation [9][10][11][12], filters [13,14], etc.…”