System and Method for Suppression of Unwanted Noise in Ground Test Facilities

Zaman, Khairul B. M. Q. ; Clem, Michelle M. ; Fagan, Amy F.

PID  :  NTRS Document ID: 20150003445

学科分类：声学和超声波

美国|英语

来源: NASA Technical Reports Server

【 摘 要 】

Systems and methods for the suppression of unwanted noise from a jet discharging into a duct are disclosed herein. The unwanted noise may be in the form of excited duct modes or howl due to super resonance. A damper member is used to reduce acoustic velocity perturbations at the velocity anti-node, associated with the half-wave resonance of the duct, weakening the resonance condition and reducing the amplitudes of the spectral peaks.