ESA Document - Emits - ESA
ESA Document - Emits - ESA ESA Document - Emits - ESA
s 4.5.6 Mechanisms Table 4-59: Overall budget HMM Assessment Study Report: CDF-20(A) February 2004 page 388 of 422 4.5.6.1 Requirements and design drivers The HMM science requirements do not state any specific requirements applicable to the MAV Mechanisms. As a result of the MAV’s configuration, the following necessary mechanism and their requirements can be derived: • Vehicle Connections o Berthing & Docking Capability � Mars Ascent Vehicle • Berthing & Docking in Martian orbit • Un-docking during Martian orbit • Crew Egress Hatches o External Hatches and Locking Mechanism at the TV Docking Port and SHM Separation I/F. • Vehicle Stage Separation System o Release & Separation of Ascent Stage1. • Egress Hatch (MAV/TV I/F) contamination protection layer (disposable). 4.5.6.2 Assumptions and trade-offs Vehicle Connection In-orbit: The following assumptions have been derived as a result of the study:- • The same Berthing and docking Mechanism shall be used throughout the system- IBDM o Androgynous system- identical mechanism mounted to both vehicles o Full redundancy of system provided o Full Internal Mechanism redundancy o Treble redundancy for release/emergency release. o Mechanism independent of hatch door. o Hatch door diametre limited to ingress/egress suitability (diameter 813 mm).
s Crew Ingress/Egress Hatch: HMM Assessment Study Report: CDF-20(A) February 2004 page 389 of 422 Once on the Martian surface, the external face of the hatch will be exposed to the Martian atmosphere and will thus be contaminated. Once the MAV has re-docked with the TV in Mars orbit, the hatch is opened to allow egress of the astronauts. This will expose the external face of the hatch to the inner habitable volume. Therefore a disposable, cover shall be implemented, to be disposed of during MAV orbit prior to Berthing & Docking. 4.5.6.3 Baseline design 4.5.6.3.1 Vehicle connections The International Docking and Berthing Mechanism shall be implemented for the TV/DM Interface. Figure 4-120: International Berthing & Docking Mechanism The IBDM has the following mechanical characteristics: • Interface loads (at the sealing interface)- acting simultaneously while docked (Flightlimit) o Axial load (1200 lbf) 5338 N o Shear load (1000 lbf) 4448 N o Bending moment (80000 in*lbf) 9039 Nm o Torsion moment (70000 in*lbf) 7909 N*m • Internal Pressure (16 psi) 110316.1 Pa • Life 15 years, Functional Life 20 Berthing/un-berthing or Docking/undocking cycles 4.5.6.3.2 Crew egress hatches Sealable hatches are required for the following I/Fs • MAV to TV • MAV to SHM
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s<br />
Crew Ingress/Egress Hatch:<br />
HMM<br />
Assessment Study<br />
Report: CDF-20(A)<br />
February 2004<br />
page 389 of 422<br />
Once on the Martian surface, the external face of the hatch will be exposed to the Martian<br />
atmosphere and will thus be contaminated. Once the MAV has re-docked with the TV in Mars<br />
orbit, the hatch is opened to allow egress of the astronauts. This will expose the external face of<br />
the hatch to the inner habitable volume. Therefore a disposable, cover shall be implemented, to<br />
be disposed of during MAV orbit prior to Berthing & Docking.<br />
4.5.6.3 Baseline design<br />
4.5.6.3.1 Vehicle connections<br />
The International Docking and Berthing Mechanism shall be implemented for the TV/DM<br />
Interface.<br />
Figure 4-120: International Berthing & Docking Mechanism<br />
The IBDM has the following mechanical characteristics:<br />
• Interface loads (at the sealing interface)- acting simultaneously while docked (Flightlimit)<br />
o Axial load (1200 lbf) 5338 N<br />
o Shear load (1000 lbf) 4448 N<br />
o Bending moment (80000 in*lbf) 9039 Nm<br />
o Torsion moment (70000 in*lbf) 7909 N*m<br />
• Internal Pressure (16 psi) 110316.1 Pa<br />
• Life 15 years, Functional Life 20 Berthing/un-berthing or Docking/undocking cycles<br />
4.5.6.3.2 Crew egress hatches<br />
Sealable hatches are required for the following I/Fs<br />
• MAV to TV<br />
• MAV to SHM
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