Analysis Code for High Altitude Balloons - FedOA - Università degli ...

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Introduction Chapter 1 temperature of the buoyant gas determines its density and therefore its lifting capacity 9 . Failing to correctly predict in-flight gas temperatures can lead to under- filling or over-filling of the balloon at launch. Under-filled systems may not reach the desired float altitude. Overfilled systems may instead burst due to over pressurization causing the loss of the experiment. Another important characteristic of zero-pressure balloons is the possibility to control, within certain limits, the vertical speed and altitude of the balloon. Actually by alternatively valving gas and dropping ballast it is possible to change either the balloon’s free lift or its gross mass 2,9 . This feature proves to be very useful to attain a particular atmospheric level or to maintain float during day and night transition. 1.4 – Objective of this work The objective of the present work is to develop a simulation model for trajectory prediction, performance evaluation and aerospace mission planning using high- altitude zero-pressure balloons. This work was carried out in support of the activities concerning the program PRORA-USV by the Italian Aerospace Research Center (CIRA) in which the knowledge of balloon systems and of their modeling and simulation is extremely important. In fact, as it will be described in the next chapter, most of the aerospace missions scheduled in the project, are based on a drop of an experimental flight vehicle from a stratospheric balloon. Therefore the availability of a tool capable of assessing on the trajectory and on the performance of the balloon flight is of paramount importance in order to meet both mission objectives and safety constraints. 10
2 The PRORA-USV Project This chapter gives an overview of the PRORA-USV Project which is being carried out by the Italian Aerospace Research Center (CIRA). As it will be shown, balloon flight is vital to the achievement of the objectives of this program. Indeed mission planning and trajectory prediction for missions related to this specific project were the inspiring reasons for the development of this work. 2.1 – Project Overview PRORA-USV is a technology development program oriented towards the maturation of certain technologies considered necessary for the timely launch of future generations reusable access-to-space transportation systems 10,13 . USV (Unmanned 11
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ACHAB at Work Chapter 4 altitude [m
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ACHAB at Work Chapter 4 Volume [m 3
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5 Validation of the Code The purpos
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Validation of the Code Chapter 5 In
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Validation of the Code Chapter 5 On
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6 The USV-DTFT1 Balloon Flight In t
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7 Lessons Learned from the USV-DTFT
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Lessons Learned from the USV-DTFT1
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ACHAB Related Projects Chapter 8
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9 Conclusions and Future Work This
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Conclusions and Future Work Chapter
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References [1] Crouch, T. D., “Li
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[37] Weismann, D., “The Influence
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