Acquisition of a Scanning Laser Vibrometer System for Experimental Studies on Nonparametric Nonlinear System Identification and Aeroelastic Instability Suppression.

摘要

The PIs current research and development, funded by AFOSR, aims to develop novel means of vibration control for aerospace systems, system identification procedures for strongly nonlinear dynamical systems, and a fully passive limit cycle oscillation (LCO) suppression system for a model generic transport wing (GTW) previously designed, built and tested in the TDT at NASA Langley. Initial efforts by the PIs led to the development of the Nonlinear Energy Sink (NES), a completely passive nonlinear mechanical device that, when physically attached to a vibrating primary system, draws energy from that system into itself in a one-way, irreversible fashion and effectively dissipates it. Later efforts by the PIs resulted in the formulation of the NSI method for system ID, combining local and global components to account for the sensitivity of strongly nonlinear systems to initial conditions and forcing. The PIs final work, still ongoing, in conjunction with NextGen Aeronautics, Inc. and colleagues at Texas A&M University, will result in the design of an NES-based LCO suppression system housed in a winglet, specifically designed for the GTW. Upon completion of rehabilitation and modifications to the wing to accommodate the winglet/NES, the full system will be ready for additional testing in the TDT.