A Computer Program to Automate a Method for Predicting Acoustically Induced Vibration in Transport Aircraft,

摘要

The report presents a computer program which automates a vibration prediction method. Inputs to the program are estimates of fluctuating pressure levels in third-octave bands. These may be either sound pressure levels from the engines or the levels of aerodynamic flow turbulence. In addition, for new aircraft with structures which differ appreciably from contemporary transport designs, values of parameters which characterize the mass and rigidity of the new structure may be input to the program. Results are printed in tables of third-octave band accelerations, and optionally they may be plotted in graphical form. It is intended that this technical memorandum be used in conjunction with AFFDL-TR-74-74, Appendix I, as a quick and efficient prediction method for acoustically induced vibration in transport aircraft.