61 research outputs found
Example on how to model and simulate turbulence for flight simulators
Analytical developments relative to gust response are discussed. Turbulence length scale, spectral functions, zero crossing values, gust loads analysis, power spectral techniques for analyzing the response of aircraft in turbulence, the spectrum of the rolling moment coefficient, and the spectrum correction factor are among the issues considered
Correlation of calculation and flight studies of the effect of wing flexibility on structural response due to gusts
A Preliminary Study of the Effect of Compressive Load on the Fairness of a Low-Drag Wing Specimen with Z-Section Stiffeners
Bending and Shear Stresses Developed by the Instantaneous Arrest of the Root of a Moving Cantilever Beam
A recurrence matrix solution for the dynamic response of aircraft in gusts
A systematic procedure developed for the calculation of the structural response of aircraft flying through a gust by use of difference equations in the solution of dynamic problems is first illustrated by means of a simple-damped-oscillator example. A detailed analysis is then given which leads to a recurrence matrix equation for the determination of the response of an airplane in a gust. The method takes into account wing bending and twisting deformations, fuselage deflection, vertical and pitching motion of the airplane, and some tail forces. The method is based on aerodynamic strip theory, but compressibility and three-dimensional aerodynamic effects can be taken into account approximately by means of over-all corrections. Either a sharp-edge gust or a gust of arbitrary shape in the spanwise or flight directions may be treated. In order to aid in the application of the method to any specific case, a suggested computational procedure is included. The possibilities of applying the method to a variety of transient aircraft problems, such as landing, are brought out. A brief review of matrix algebra, covering the extent to which it is used in the analysis, is also included. (author
Critical combinations of shear and transverse direct stress for an infinitely long flat plate with edges elastically restrained against rotation
The calculation of modes and frequencies of a modified structure from those of the unmodified structure
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