Development of free flight experimental and analytical procedures for atmospheric entry vehicles

Olaseinde Jegede, Koji Fujita, Hiroki Nagai, Hideyuki Tanno

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

3 Citations (Scopus)


We discuss in this paper an effort undertaken to develop experimental and analytical techniques for improved fidelity analysis of capsule flight dynamics. Free flight experimentation is used in order to preserve the capsule motions of interest, beneficial when compared to the norm of wind tunnel tests. Typical drawbacks of free flight test procedures include the cumbersome instrumentation required and the susceptibility to a largely uncontrollable test environment; however, the present research demonstrates that a simple system of only 9 linear accelerometers may be used to successfully obtain capsule body accelerations in free flight. Whereas the acceleration analysis techniques used in the present study are well developed in the fields of Biomechanics and Robotics, the current effort seeks to show their equal applicability for capsule body accelerations and thus determination of key dynamic characteristics indicators such as damping coefficient. For this study a 1:1.6 scale model of the Hayabusa capsule with an internal array of 9 linear accelerometers is released to fall unconstrained from a height of approximately 150 m using a balloon. We proceed to process the free flight data to obtain the body accelerations and subsequently present a suggestion of how the damping coefficient of the capsule may be calculated.

Original languageEnglish
Title of host publicationAIAA Scitech 2019 Forum
PublisherAmerican Institute of Aeronautics and Astronautics Inc, AIAA
ISBN (Print)9781624105784
Publication statusPublished - 2019
EventAIAA Scitech Forum, 2019 - San Diego, United States
Duration: 2019 Jan 72019 Jan 11

Publication series

NameAIAA Scitech 2019 Forum


ConferenceAIAA Scitech Forum, 2019
Country/TerritoryUnited States
CitySan Diego


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