Multimodal shunt damping of mechanical structures using multiple digital vibration absorbers. (1st December 2022)

• Record Type: Journal Article
• Authors: Dietrich, Jennifer; Raze, Ghislain; Kerschen, Gaëtan
• Is Part Of: Engineering research express. Volume 4:Number 4(2022)
• Publication Date: 2022-12-01
• Subjects: piezoelectric shunting -- digital vibration absorber -- vibration mitigation -- multimodal damping -- bladed structures; Engineering -- Periodicals; 620.005
• DOI: 10.1088/2631-8695/ac9fa8
• Languages: English
• ISSNs: 2631-8695

Abstract

Abstract: A novel piezoelectric shunt damping methodology for structures featuring different mode families with high modal density is introduced in this work. To this end, multiple digital vibration absorbers comprising each a voltage sensor, a digital processing unit and a current injector are connected to multiple piezoelectric transducers bonded to these structures. The digital absorbers mimic a multi-stage current blocking shunt circuit whose parameters are determined in a sequential manner to account for the interaction between the different branches. Two tuning strategies which target either an actual resonance frequency of a mode family or a so-called mean frequency are developed and compared, and their robustness to mistuning is addressed. The use of these tuning strategies in combination with the multi-stage shunt design allows to target multiple mode families at the same time. Finally, the theoretical developments are demonstrated experimentally on a 3D-printed rail with 5 blades.