Author Topic: ISS Russian Segment Aft Docking Module  (Read 1025 times)

Offline Danderman

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ISS Russian Segment Aft Docking Module
« on: 03/07/2012 08:38 PM »
Its a slow news day, so let me describe a hypothetical design that helps the Russian segment meet some requirements.

In particular, the aft Service Module docking adapter must be nearing the end of its design lifetime, in terms of numbers of dockings performed. I don't know what that specified lifetime is, but I know that its an ongoing concern. So, the primary function of the Aft Docking Module would be to replace the current aft docking port as the ISS aft docking port.  The current aft docking port would be stabilized by engaging both sets of docking hooks, and manual installation of docking clamps.

A secondary function would be to provide stowage for cargo delivered by Progress or ATV to the Aft docking port. The large compartment is 3.3 meters in diameter, providing plenty of stowage volume.

A tertiary function would be to serve as propellant stowage. Although the module itself does not contain pumps, its external tanks could augment the existing Service Module propellant system.

A fourth function would be to provide additional power to the Russian segment. A pair of Progress-class solar arrays would provide 1,000 nominal watts to the Russian segment. On the periphery of the large compartment are mounts for additional, larger panels that would require EVA for installation, and would have to be carried to ISS as cargo.

If the rear docking port were a standard female hybrid port, the module could also serve as a rear airlock for ISS.

An additional function would be provided by the small thrusters on the periphery of the large compartment. Although these thrusters are installed for controlability of the stack during docking with ISS, they could also be used to provide controlability of ISS when no Progress or ATV is docked to the aft docking port.

Another function would be provided by Rodnik tanks, which would allow for additional water stowage on ISS.

The module is sized to be launched by Soyuz-2, using a 3 ton PAO for delivery to ISS. The PAO would be jettisoned soon after docking, although the attach time could be extended if TsUP wanted to use the 880 kg prop supply in the PAO for ISS reboost.  This relatively inexpensive module would provide significant new capabilities for ISS. Although this particular point design is probably not the optimum design for such a module, its in the right direction.

« Last Edit: 03/07/2012 08:38 PM by Danderman »