KC-135 POWER SPECTRAL VERTICAL GUST LOAD ANALYSIS. VOLUME 1. DETAILED ANALYSIS AND RESULTS
Final technical rept. 1 Jul 1965-1 Jun 1966
BOEING CO RENTON WA AIRPLANE DIV
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This report presents the results of an analysis to obtain the stress response parameters level of stress per level of turbulence and zero-crossing rates at two wing stations and two body stations of the KC-135 airplane where the margins of safety for gusts are minimum. Five combinations of gross weight, speed, and altitude were selected. The results of the computer analysis present the effects of changes in scale of turbulence and upper cutoff frequency on the response parameters and zero-crossing rates. Results indicate a large reduction in stress response parameter and small reduction in zero-crossing rate with increasing scale of turbulence. Variations of upper cutoff frequence above the highest modal frequency used in the analysis indicate negligible change in either stress response parameter or zero-crossing rates. The ratios of incremental limit allowable stress to stress response parameter obtained over a wide range of gross weight, speed, and scale of turbulence result in a minimum value of 53. This document presents the analyses and specific results described above.
- Transport Aircraft
- Numerical Mathematics