Abstract
Practical Aspects of Re-Entry Problems. Entry trajectories for vehicles without and with lift are investigated. The existence and the significance of the second peak deceleration in re-entry trajectories are presented. The second peak may be greater than the first one. For a given entry velocity, the first peak deceleration can be a discontinuous function of entry angle. With proper lift modulation of the body-type vehicle, i.e. by changing the angle of attack of the vehicle, the range of the entry angle for non-skip trajectories can be increased significantly, while the first peak deceleration remains less than 5 times the gravitational acceleration.
A constant elevation maneuver is presented and its effectiveness in reducing the second peak deceleration is explained. This maneuver, followed by a constant lift modulation, permits the control of the point of landing over a wide range.
The practical application of the rate of change of deceleration in deciding the proper lift modulation is demonstrated.
Zusammenfassung
Praktische Aspekte des Rückkehrproblems. Es werden Rückkehrbahnen für Fahrzeuge mit und ohne Auftrieb untersucht; hierbei wird auf das Auftreten einer zweiten Verzögerungsspitze hingewiesen. Diese zweite Verzögerungsspitze kann höher sein als die erste. Weiters kann die erste Verzögerungsspitze bei gegebener Eintauchgeschwindigkeit eine diskontinuierliche Funktion des Eintrittswinkels sein.
Ferner wird gezeigt, daß durch ein Aufsteigemanöver die zweite Verzögerungsspitze verringert werden kann, wobei auch noch eine Variation des Landungspunktes möglich ist.
Résumé
Aspects pratiques de problèmes de rentrée. Les investigations de trajectoires de rentrée avec ou sans portance montrent l’importance d’un second pic de décélération. Il peut être supérieur au premier. A vitesses de rentrée égales, le premier pic peut être une fonction discontinue de l’angle de rentrée. Une modulation de portance permet d’accroître sensiblement la plage de variation de l’angle de rentrée et de réduire le premier pic en dessous de 5 g.
Une manoeuvre d’élévation constante est effective pour réduire l’importance du second pic et, suivie d’une portance constante, permet de contrôler l’impact dans un domaine étendu.
L’utilisation pratique de la variation d’accélération subie pour le contrôle de la modulation de portance à appliquer est démontrée.
This research was supported by the United States Air Force through the Air Force Office of Scientific Research, Air Research and Development Command, under Contract No. AF 49(638)-445, Project No. 9781.
This is a preview of subscription content, log in via an institution to check access.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Preview
Unable to display preview. Download preview PDF.
References
D. Chapman, An Approximate Analytic Method for Studying Entry into Planetary Atmospheres. NACA TN 4276, May 1958.
D. Chapman, An Analysis of the Corridor and Guidance Requirements for Supercircular Entry to Planetary Atmospheres. NASA TR R-55, 1959.
L. Lees, F. W. Hartwig, and C. B. Cohen, The Use of Aerodynamic Lift During Entry into the Earth’s Atmosphere. ARS Journal 29, 633–641 (1959).
J. D. C. Crisp, The Dynamics of Supercircular Multiple-Pass Atmospheric Braking. Polytechnic Institute of Brooklyn, PIBAL Report No. 582, October 1960;
J. D. C. Crisp, Astronaut. Acta 8, 1–27 (1962).
J. D. C. Crisp, An Assessment of Lift-Drag Modulation Techniques for Atmospheric Entry. Polytechnic Institute of Brooklyn, PIBAL Report No. 586, January 1961.
T. D. Duane, E. L. Beckman, J. E. Ziegler, and H. N. Hunter, Some Observations on Human Tolerance to Accelerative Stress. III. Human Studies of Fifteen Transverse G. J. Aviat. Med. 26, 298–303 (1955).
R. Edelberg, J. P. Henry, J. A. Maciolek, E. N. Salzman, and G. D. Zuidema, Comparison of Human Tolerance to Acceleration of Slow and Rapid Onset. J. Aviat. Med. 27, 482–489 (1956).
H. J. Allen and A. J. Eggers, Jr., A Study of the Motion and Aerodynamic Heating of Ballistic Missiles Entering the Earth’s Atmosphere at High Supersonic Speed. NACA Report 1381, 1958.
K. Wang and L. Ting, An Approximate Analytic Solution of Re-Entry Trajectories with Aerodynamic Forces. ARS Journal 30, 565 – 566 (1960).
K. Wang and L. Ting, Approximate Solutions for Re-Entry Trajectories with Aerodynamic Forces. Polytechnic Institute of Brooklyn, PIBAL Report No. 647, AFOSR 684, May 1961.
L. Broglio, Similar Solutions in Re-Entry Lifting Trajectories. Space Research, Edited by Hilde Kallmann Bijl, pp. 564–580. New York: Interscience Publishers, Inc. 1960.
A. Ferri and L. Ting, Practical Aspects of Re-Entry Problems. Polytechnic Institute of Brooklyn, PIBAL Report No. 705, July 1961.
Author information
Authors and Affiliations
Rights and permissions
Copyright information
© 1962 Springer-Verlag Wien
About this paper
Cite this paper
Ferri, A., Ting, L. (1962). Practical Aspects of Re-Entry Problems. In: Space Flight and Re-Entry Trajectories. Springer, Vienna. https://doi.org/10.1007/978-3-7091-5470-0_9
Download citation
DOI: https://doi.org/10.1007/978-3-7091-5470-0_9
Publisher Name: Springer, Vienna
Print ISBN: 978-3-7091-5472-4
Online ISBN: 978-3-7091-5470-0
eBook Packages: Springer Book Archive