Multimodal Vibration Damping of a Smart Beam Structure using Modal SSDI-Max Technique
A. Chérif, C. Richard, D. Guyomar, M. Meddad, A. Eddiai, Y. Boughaleb, A. Migalska-Zalas, A. Zawadzka, A. Hajjaji and B. Sahraoui
Advanced materials such as carbon fiber, composite materials et al. are more and more used in modern industry. They make the structures lighter and stiffer. However, they bring vibration problems. Researchers studied numerous methods to eliminate the undesirable vibrations. These treatments are expected to be a compact, light, intellectual and modular system. Recently, nonlinear techniques which are known as Synchronized Switch Damping (SSD) technique was proposed. These techniques synchronously switched when structure got to its displacement extremes that leading to a nonlinear voltage on the piezoelectric elements. This paper presents a performance analysis of an improved modal SSDI approach called “SSDI Max”. The particularity of this new approach is to maximize the self generated voltage amplitude by a proper definition of the switch instants according to the chosen targeted mode. This paper presents simulations performed on a model representative of a smart beam. Damping results are given in the case of multimodal excitations. The paper analyses the control time window influence on the damping performance of the system. Results show that substantial damping increase can be obtained with very slight modification of the control architecture and the same control energy.
Keywords: Piezoelectric, Smart Beam structure, Modal control, Semi-active control, SSDI Max, Time window.