An Analytical Study of the Response of a Constant-attitude Aircraft to Atmospheric Turbulence
Author | : Frederick O. Smetana |
Publisher | : |
Total Pages | : 62 |
Release | : 1973 |
Genre | : Gust loads |
ISBN | : |
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Author | : Frederick O. Smetana |
Publisher | : |
Total Pages | : 62 |
Release | : 1973 |
Genre | : Gust loads |
ISBN | : |
Author | : Frederick O. Smetana |
Publisher | : |
Total Pages | : 60 |
Release | : 1973 |
Genre | : Gust loads |
ISBN | : |
Author | : William D. Grantham |
Publisher | : |
Total Pages | : 76 |
Release | : 1969 |
Genre | : Aerodynamics |
ISBN | : |
Atmospheric turbulence effects on stability and response characteristics of subsonic jet transport aircraft.
Author | : John C. Houbolt |
Publisher | : |
Total Pages | : 128 |
Release | : 1964 |
Genre | : Aerodynamics |
ISBN | : |
A coordinated account of flight measurements of random atmospheric turbulence, of calculated and experimentally determined airplane transfer functions, and of analytical procedures for determining output responses is given based on power spectral techniques. Implications of these techniques for load prediction and for design are discussed, and brief review of basic procedures and mathematics involved is also included.
Author | : Ronald J. Wilson |
Publisher | : |
Total Pages | : 92 |
Release | : 1971 |
Genre | : Atmospheric turbulence |
ISBN | : |
A turbulence response investigation was conducted with the XB-70 airplane. No special turbulence penetration techniques, speeds, or other restrictions were specified for the investigation, nor were any flights made solely to obtain turbulence data. During 79 flights, turbulence was encountered, and recorded on a VGH recorder, 6.2 percent of the total flight distance at supersonic speeds above an altitude of 12,192 meters (40,000 feet). Geographical locations are given for selected turbulence encounters. For 22 flights the airplane was instrumented to measure true gust velocities and the structural acceleration response to turbulence. The turbulence intensities measured were very low in comparison with those measured at high altitudes in other investigations. Acceleration response spectra, frequency response transfer functions, and coherence functions were computed from three turbulence encounters at Mach numbers of 0.88, 1. 59, and 2.35. Results are compared with calculated studies. Frequencies from the vertical and lateral structural modes, dominant in the airplane acceleration responses, were compared with the natural frequencies of the human body in the vertical and lateral directions.
Author | : Boyd Perry |
Publisher | : |
Total Pages | : 68 |
Release | : 1976 |
Genre | : Stability of airplanes |
ISBN | : |
Author | : Ellwood L. Peele |
Publisher | : |
Total Pages | : 52 |
Release | : 1971 |
Genre | : Airplanes |
ISBN | : |
A method is presented for estimating some lateral and longitudinal rigid-body responses of airplanes to random atmospheric turbulence. Estimates of center-of-gravity load factors and motion responses can be made simply and easily through the use of parametric charts. Sample calculations are included to illustrate the method.
Author | : John Marshall Eggleston |
Publisher | : |
Total Pages | : 68 |
Release | : 1960 |
Genre | : Atmospheric turbulence |
ISBN | : |
Summary: The report is separated into two parts. In the first part the theoretical basis for calculating the lateral motions of an airplane flying through continuous random atmospheric turbulence is presented. The lateral motions are derived in terms of (1) the transfer functions relating the motion in the various degrees of freedom to the yawing moment, rolling moment, and side force, (2) the statistical forces and moments at the center of gravity due to gust velocities acting on the lifting surfaces of the airplane, and (3) the power spectra of the three orthogonal components of gust velocity acting on the airplane along the flight path. The method takes into account the random variations of gust velocity across the span and along the fuselage. Solutions are given in the form of equations relating the power spectra of the angular motions of the airplane to the power spectra of the gust velocities.
Author | : Waldo I. Oehman |
Publisher | : |
Total Pages | : 52 |
Release | : 1972 |
Genre | : Airplanes |
ISBN | : |
An analytical study has shown that, with proper selection of feedback gains, an automatic control system can reduce excursions in altitude of a jet transport flying in turbulence without increasing structural loads. The control system uses feedback of attitude-angle and pitch-rate signals to the elevator and uses feedback of altitude and altitude-rate signals to the throttle.