Control of Panel Response to Turbulent Boundary-Layer and Acoustic Excitations

摘要

Nonlinear response of a panel structure results when forced by a subsonic turbulent boundary layer and pure- tone sound in a wind tunnel. It is a coupled problem, where flow, structure, and sound interact. The structure exhibits a broadband response typical of turbulent boundary-layer loading with superimposed pure tone and harmonics over the band, a process which is statistically stationary, but non-Gaussian. The mechanism is an energy transfer process: the amount of energy supplied to the harmonics is removed from the low-frequency band and the fundamental tone. The objective is to control the nonlinear wave using a time-harmonic actuator tone.