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Structural and Control Concepts for Variable Geometry Planetary Entry SystemsThe results presented in this paper apply to a generic vehicle entering a planetary atmosphere which makes use of a variable geometry change to modulate the heat, drag, and acceleration loads. Two structural concepts for implementing the cone angle variation, namely a segmented shell and a corrugated shell, are presented. A structural analysis of these proposed structural configuration shows that the stress levels are tolerable during entry. The analytic expressions of the longitudinal aerodynamic coefficients are also derived, and guidance laws that track reference heat flux, drag, and aerodynamic acceleration loads are also proposed. These guidance laws have been tested in an integrated simulation environment, and the results indicate that use of variable geometry is feasible to track specific profiles of dynamic load conditions during reentry.
Document ID
20150011979
Acquisition Source
Jet Propulsion Laboratory
Document Type
Conference Paper
External Source(s)
Authors
Quadrelli, Marco
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Boussalis, Dhemetrios
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Davis, Gregory
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Kwok, Kawai
(California Inst. of Tech. Pasadena, CA, United States)
Pellegrino, Sergio
(California Inst. of Tech. Pasadena, CA, United States)
Date Acquired
July 1, 2015
Publication Date
May 4, 2009
Subject Category
Aerodynamics
Meeting Information
Meeting: AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference
Location: Palm Springs, CA
Country: United States
Start Date: May 4, 2009
End Date: May 7, 2009
Sponsors: American Society of Civil Engineers, American Society of Mechanical Engineers, American Helicopter Society, Inc., American Inst. of Aeronautics and Astronautics, American Society for Composites
Distribution Limits
Public
Copyright
Other
Keywords
decelerators
trajectory
dynamics
entry guidance

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