STOL Aircraft Structural Vibration Prediction Method. Volume 1. Prediction Procedure and Aircraft Parametric Studies.

摘要

A structural vibration response prediction method was developed for STOL type aircraft. The method was developed to significantly improve environmental prediction methods that have been used in the past. A mathematically rigorous spectral analysis approach was developed that simulated the structure with a finite element model which used correlated and calculated acoustic input data for a forcing function. The structural vibration predictions adequately described the operating levels and spectral frequency content of chosen locations on two STOL aircraft. Comparisons of predicted and measured data show that the method developed may be used for a precise way to predict complex structural response to jet engine excitation. The development of prediction method for determination of external acoustic levels for STOL aircraft was accomplished in a concise manner. The method is described in detail with successful comparisons of actual measurements to predictions. The method is seen to give good results and represents a significant improvement in acoustic prediction methods for STOL aircraft. (Author)