ESA Document - Emits - ESA
ESA Document - Emits - ESA ESA Document - Emits - ESA
s HMM Assessment Study Report: CDF-20(A) February 2004 page 236 of 422 The mass of the engine frame was achieved by comparison with the one used for the TMI module. 3.4.2.3.3 TEI module The TEI module consists of one stack equal to the MOI one. This stack is located inside the MOI backbone structure and attached to it, by means of rings and a three-point connection. For the separation system of the last stage of the MOI module from TEI module, two options were analysed: • Vertical guiding rail system of the backbone, to allow only the axial descent movement of the backbone • The same separation system as the one used for Ariane-5 fairing. It consists of a pyro cord, which breaks a bolted joint around the fairing Option 2 was selected because the mass penalty is smaller and it is a simpler system to install. For this system, the backbone has to be divided into two half cylinders, which are attached by a bolted joint. The MOI backbone operates like a fairing to the TEI module. The interior part of the MOI backbone should be almost entirely covered with acoustic absorption panels, to counter noise levels of vibration in the structure at lift-off. 3.4.2.3.4 MOI connection to THM The connection between the propulsion module and the habitation module is made through an aluminium cone of 4 mm thickness and 2 m length. 3.4.2.4 Budgets The structural mass budget is shown in Table 3-61: Item Nr. Mass [kg] Margin [%] Mass with Margin [kg] LOX Tank 1 819.82 10 901.80 LH2 Tank 1 1126.12 10 1238.74 Lower Skirt 1 707.57 10 778.32 Stack Ring 2 153.08 10 183.69 Backbone 1 2136.13 20 2563.36 Backbone Ring 2 162.95 10 179.24 Engine Frame 1 1500 0 1500 Skin 1 484.2 5 508.44 LOX Tank Debris Shielding 1 78.48 10 86.33 LH2 Tank Debris Shielding 1 319.35 10 351.29 TOTAL 8291.21 Table 3-61: TMI stack structural mass budget
s Item Nr. Mass [kg] Margin [%] Mass with Margin [kg] Backbone 1 2847.61 20 3417.129 Backbone Ring 2 162.95 10 179.24 TOTAL 3775.61 Table 3-62: TMI stage backbone structural mass budget Item Nr. Mass [kg] Margin [%] Mass with Margin [kg] LOX Tank 1 278.79 10 306.67 LFuel Tank 1 423.65 10 466.01 Lower Skirt 1 284.66 10 313.12 Stack Ring 2 167.67 10 201.20 Engine Frame 1 475 10 522.50 Skin 1 218.76 5 240.64 LOX Tank Debris 1 Shielding 59.52 10 65.47 LFuel Tank Debris 1 Shielding 120.21 10 132.23 TOTAL 2247.84 Table 3-63: MOI 80 tonne Stack Structural Mass budget Item Nr. Mass [kg] Margin [%] Mass with Margin [kg] Backbone 1 1737.31 20 2084.77 Backbone Ring 2 203.70 10 224.07 MOI/TEI Interior 2 98.91 10 108.80 Backbone ring Separation System 1 50 20 60 TOTAL 2477.64 Table 3-64: MOI Backbone Structural Mass budget Item Nr. Mass [kg] Margin [%] Mass with Margin [kg] Connection Cone 1 243.38 10 267.72 Ring_Connect Backbone to THM 1 162.95 10 179.24 Ring Connect Cone 1 to THM 68.95 10 75.86 TOTAL 522.82 Table 3-65: MOI connection to THM Structural Mass budget HMM Assessment Study Report: CDF-20(A) February 2004 page 237 of 422
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s<br />
Item Nr. Mass [kg] Margin [%] Mass with Margin [kg]<br />
Backbone 1 2847.61 20 3417.129<br />
Backbone Ring 2 162.95 10 179.24<br />
TOTAL 3775.61<br />
Table 3-62: TMI stage backbone structural mass budget<br />
Item Nr. Mass [kg] Margin [%] Mass with Margin [kg]<br />
LOX Tank 1 278.79 10 306.67<br />
LFuel Tank 1 423.65 10 466.01<br />
Lower Skirt 1 284.66 10 313.12<br />
Stack Ring 2 167.67 10 201.20<br />
Engine Frame 1 475 10 522.50<br />
Skin 1 218.76 5 240.64<br />
LOX Tank Debris 1<br />
Shielding<br />
59.52 10 65.47<br />
LFuel Tank Debris 1<br />
Shielding<br />
120.21 10 132.23<br />
TOTAL 2247.84<br />
Table 3-63: MOI 80 tonne Stack Structural Mass budget<br />
Item Nr. Mass [kg] Margin [%] Mass with Margin [kg]<br />
Backbone 1 1737.31 20 2084.77<br />
Backbone Ring 2 203.70 10 224.07<br />
MOI/TEI Interior 2 98.91 10 108.80<br />
Backbone ring<br />
Separation System 1 50 20 60<br />
TOTAL 2477.64<br />
Table 3-64: MOI Backbone Structural Mass budget<br />
Item Nr. Mass [kg] Margin [%] Mass with Margin [kg]<br />
Connection Cone 1 243.38 10 267.72<br />
Ring_Connect<br />
Backbone to THM<br />
1 162.95 10 179.24<br />
Ring Connect Cone 1<br />
to THM<br />
68.95 10 75.86<br />
TOTAL 522.82<br />
Table 3-65: MOI connection to THM Structural Mass budget<br />
HMM<br />
Assessment Study<br />
Report: CDF-20(A)<br />
February 2004<br />
page 237 of 422
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