Astronautics Space Flight

Dynamics of Atmospheric Re-Entry by Frank J Regan

By Frank J Regan

Proposing entire assurance of the dynamics of atmospheric re-entry, this article information primary thoughts and useful purposes resembling the atmospheric version and re-entry mechanics, and is going directly to speak about particular issues similar to re-entry decoys, movement fields and blunder research.

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Nevertheless, Newton indicated that he thought the agent was material when, in a 1692 letter to Richard Bentley, he wrote [T]hat one body may act on another through a vacuum, without the mediation of anything else, by and through which their action and force may be conveyed from one to another, is to be so great an absurdity, that I believe no man who has . . a competent faculty of thinking can ever fall into it. Space does not permit an extended discussion of the implications of this most fundamental of physical concepts.

The density profile of the Martian atmosphere is given in Fig. 7a. These data were taken from the Viking 1 and 2 landers. The separate measurements agree quite well. Both Viking landers provided density measurements over a range from the surface to an altitude of 120 km, with an accuracy that would have been impossible to accomplish from Earth. Pressures derived from the temperature and density profiles are given in Fig. 7b. 5 mb, although at the poles in the winter the pressure might be half this value.

The distributed pressure field will be represented by various "lumped" parameters known as aerodynamic coefficients and stability derivatives. These parameters will vary significantly over the entire trajectory. However, such variations are less important when compared to changes in atmospheric density, which will vary by several orders of magnitude from entry to impact. If the re-entry body can be regarded as a rigid body immersed in and moving through a gas and subjected to a gravitational field, a vectorial representation of the loads might take the following form: mab = Fba+Fbg where m is the body mass, ab is the acceleration of the body, Fba is the aerodynamic load, and Fbg is the gravitational load.

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