European Space Agency
European Space Agency
The project focuses on the development up to the preliminary design stage (PDR) of the OneSat DPS product which is a key satellite element providing for thrust orientation during in orbit and electrical orbit raising phases. Although heritage is provided through the previous Eurostar developments, the concept is adapted to match the new satellite constraints in terms of size and accommodation: the stowed allowable volume which is very limited due to the necessary accommodation of many other appendices, the HET thrust direction needs for the various types of maneuvers, and the spacecraft elements to be isolated from (solar array for erosion and all spacecraft for plume effect).
While preserving the overall concept, this leads to specific modifications mainly related to the overall geometry (orientation of the rotary actuators axes) and length of the DPS booms and consequently the complete update of the design justification file.
Additionally, a way to optimize the associated Hold and Release Mechanism with respect to power and mass is also analyzed.
The key challenge is to implement the evolutions required by the OneSat satellite while keeping the maximum heritage from previous satellites. Particularly attention needs to be paid to the capability to reach any position between the configurations (stowed, EOR, OSM + failure cases) while respecting the allowable volumes and the hinge actuator qualification. The new geometry also has to maximise the thruster efficiency during the various manoeuvres with electric propulsion.
The product developed in the frame of this project is a three axis arm providing major system benefits:
The DPS is composed of:
The DPS is part of the Deployable Thruster Module Assembly (DTMA) which includes:
There are two DTMA per Spacecraft. They are deployed before the Satellite Orbit Raising Phase.
The DPS development plan proposed in the frame of that ARTES contract covers the development up to the PDR with the following main milestones:
The DPS development will be continued in the frame of the Novacom 1 partnership project and will go through the Critical Design Review and the final qualification review.
All the work planned to be done in the frame of this ARTES contract has been successfully performed and the review successfully passed concluding on a safe design and development plan. Several “normal work” actions are to be closed for the Critical design Review.
The HRM optimisation assessment is technically completed concluding on several possible options. The decision remains to be taken in the frame of the project continuation according to the evaluated return on investment.
