ESA Document - Emits - ESA
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ESA Document - Emits - ESA

ESA Document - Emits - ESA ESA Document - Emits - ESA

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s HMM Assessment Study Report: CDF-20(A) February 2004 page 218 of 422 • Vehicle Connections: o Berthing & Docking Capability: � Earth Return Capsule: • Berthing & Docking in LEO • Un-docking during TEI � Martian Decent Module: • Berthing & Docking in LEO • Un-docking during Martian orbit � Mars Ascent Vehicle: • Berthing & Docking in Martian orbit • Un-docking during Martian orbit o Berthing Capability: � All Modules not requiring an un-docking mechanism capability will require a berthing ability for LEO assembly operations. • Crew Egress Hatches: • External Hatches and Locking Mechanism at the ERC and DM Docking Ports • Crew Conditioning and Exercise Facilities: • Crew Exercise Device/Facility • Crew Short Arm centrifuge for 1g environment simulation 3.3.8.1.1 Propulsion module • Vehicle Connections • Berthing Capability � All support structure elements will require a berthing ability for LEO assembly operations. � All propulsion stacks will require a berthing ability. • Release Capability � After use of individual stages, the stage must be released at the support structure I/F. 3.3.8.2 Assumptions and trade-offs 3.3.8.2.1 Power generation system The following assumptions have been derived as a result of the study: • The number of arrays shall be minimised • The technology chosen shall ensure that stowage of the array is possible The following Solar Array Deployment systems are available: 1. Advanced rigid arrays 2. Polar platform arrays The following highlights key features of the two concepts:

s HMM Assessment Study Report: CDF-20(A) February 2004 page 219 of 422 Advanced rigid arrays have the following features: • Typically four or five panel wings with surface area of 30-35 m 2 (typical panel size 2.5 m x 2.75 m). • Spring-driven, single-direction deployment, with latched panels for in-flight wing stiffness • No Re-stowed latching capability Polar platform arrays have the following features: • Up to 16 panel capability with surface area of 80 m 2 (typical panel size 5 m x 1 m, current qualification status of 14 panels). • Motorised, cable actuated deployment with re-stowage capability (not yet qualified). • No Re-stowed latching capability The Polar platform type array would better suit this application given the number of. Additionally, the requirement for re-stowage is better facilitated with a motorized deployment system. 3.3.8.2.2 Communications system The following assumptions have been derived as a result of the study: • All boom-mounted antennas require tracking capability. • Tracking can be realized with two perpendicular rotational axes. No trade-off has been performed. The choice of the chosen mechanism has been made based upon the available systems and the requirements stated earlier. 3.3.8.2.3 Vehicle connections The following assumptions have been applied: • Only the DM and ERC require berthing and docking ports • Further Module assembly in LEO will be performed by Berthing Mechanisms, aided by LEO facilities i.e. robotic arm capture of module and assisted berthing • A spare berthing and docking port is required for in-orbit contingency Two systems have been considered: 1 Russian Docking System 2 International Docking & Berthing Mechanism (IDBM)

s<br />

HMM<br />

Assessment Study<br />

Report: CDF-20(A)<br />

February 2004<br />

page 218 of 422<br />

• Vehicle Connections:<br />

o Berthing & Docking Capability:<br />

� Earth Return Capsule:<br />

• Berthing & Docking in LEO<br />

• Un-docking during TEI<br />

� Martian Decent Module:<br />

• Berthing & Docking in LEO<br />

• Un-docking during Martian orbit<br />

� Mars Ascent Vehicle:<br />

• Berthing & Docking in Martian orbit<br />

• Un-docking during Martian orbit<br />

o Berthing Capability:<br />

� All Modules not requiring an un-docking mechanism capability will<br />

require a berthing ability for LEO assembly operations.<br />

• Crew Egress Hatches:<br />

• External Hatches and Locking Mechanism at the ERC and DM Docking Ports<br />

• Crew Conditioning and Exercise Facilities:<br />

• Crew Exercise Device/Facility<br />

• Crew Short Arm centrifuge for 1g environment simulation<br />

3.3.8.1.1 Propulsion module<br />

• Vehicle Connections<br />

• Berthing Capability<br />

� All support structure elements will require a berthing ability for LEO<br />

assembly operations.<br />

� All propulsion stacks will require a berthing ability.<br />

• Release Capability<br />

� After use of individual stages, the stage must be released at the support<br />

structure I/F.<br />

3.3.8.2 Assumptions and trade-offs<br />

3.3.8.2.1 Power generation system<br />

The following assumptions have been derived as a result of the study:<br />

• The number of arrays shall be minimised<br />

• The technology chosen shall ensure that stowage of the array is possible<br />

The following Solar Array Deployment systems are available:<br />

1. Advanced rigid arrays<br />

2. Polar platform arrays<br />

The following highlights key features of the two concepts:

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