| Popis: |
In the frame of the development of ESA\'s Space Rider, the new European space transportation system, the conceptual design of the Descent Subsystem has been performed, laying the basis for the following development work of next design phases. The Descent System will be triggered at subsonic speed: a first phase of deceleration guaranteed by drogue parachute(s), a gliding parachute will be deployed and the controlled descent phase will begin. This solution will allow for a safe landing, reducing operating costs as well as recovery and refurbishment time of the vehicle. It is the first time that this kind of architecture for a descent subsystem is being developed in a major European space program and it is the most important space project with a gliding parachute since NASA\'s X-38, which was developed until 2001. The design of the Descent Subsystem poses a number of challenges, given the demanding requirements defined for this project: pinpoint landing, featured by low peak g-forces and thus low vertical landing speed. Additionally, strict requirements in terms of available space and power, maximum attainable weight and maximization of reliability and reusability complete the framework. In the phase A of the project a trade-off between different technical solutions has been carried-out by taking in account parameters such as development and recurring costs, readiness level of already available technologies, lead-time and heritage: two main possible architectures for the Descent Subsystem have been identified. The main difference between the two main solutions is the presence of a single reefed drogue parachute or the presence of two different drogues. In this study all the main equipment have been defined, and advantages and shortcomings coming from each solution critically analyzed. Critical areas to be further investigated have been identified to focus on in the next phases of design. |
