返回Google圖書搜尋

Theoretical and Experimental Investigation of Random Gust Loads

其他書名	Part 2 - Theoretical Formulation of Atmospheric Gust Response Problem
出版	National Advisory Committee for Aeronautics, 1957
URL	http://books.google.com.hk/books?id=yxEYkgEACAAJ&hl=&source=gbs_api

註釋Equations of motion are derived for the dynamic response of aircraft to random atmospheric gust loads. These equations include degrees of freedom of plunging, pitching, rolling, and an arbitrary number of elastic normal modes. Solutions of these equations are expressed interms of a number of so-called primitive solutions obtainable by introducing the Dirac delta function. The solutions for center-of-gravity acceleration response and wing-root bending-moment response depend upon certain autocorrelations and cross correlations which enter the analysis. Results for simplified cases show that unsteady aerodynamic theory is not important for increasingly large values of the turbulence scale compated with values of the wing chord. However, the pitching degree of freedom exhibits an important effect as the turbulence scale increases. The results are also compared with the results of the usual sharp-edged-gust formula.