L2 Mission and Habitat Design

7/21/2019 L2 Mission and Habitat Design

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C

C

C

M L L2

L2

L2 H



M L L

F C

E ( )F

( )

P F H 53.00 5.2 0%G A M H I J H IIB 19.00 4.6 100%P A F 9 13.15 5.2 100%G A KB P FG 7.80 4.11 100%P /G A L A D I H 22.95 4.57 95%G A E A (A ) E A 5 21.00 4.57 94%G A CAL C 3B 12.00 3.35 80%G A L A A 29.40 5 97%G A L A /B D II 7.10 2.44 98%G A D B 2 13.74 3.3 71%



M L L C



F C

E ( ) G( )

F

P A F 9 11,500 7,000 5.2 100%

G A LA A 29,400 13,000 5 97%

G AM H

I J H IIB 19,000 8,000 4.6 100%G A E A (A ) E A 5 21,000 6,950 4.57 94%

LV Selection CriteriaC

M LEO < 55,000 K

P L

I







































I M M

C P = 15D M C3 = 4.7 K /

P = 30 LO = 25LH2= 5

C



I M M



Lagrange L2 Station : Halo Orbit



TrajectoryL2 E , , E M (

) .



D H

∆ / F E 2 E E E GE

E 9.3 10

E

( E ) 3.43 4.24 4.33

G O(GEO)

1.47 2.06 1.63

L 1(EML 1)

0.64 2.52 0.77 0.77 1.38

2 (E 2) 0.14 0.64 2.52 0.33 0.33 1.47

L L (LLO) 0.65 1.87

M (M ) 2.53 1.87

E 2 <1.0





G P

M M LEO

E

Mission Goals

E A

M

O

Mission Tasks



A H 2 A

E F D

E

I E A

Mission Requirements



2013

2

6 1 P

≈ 40 M

≈ 5

1

C

0

4

M

M

L2 HALO O

6.1

C

F E

E

H

I

C .

HAB

A E

Mission Statistics



P P

F D P ( ) F D P ( )

L L

System Elements



HAB= 7.5= 67 3

= 1.5

= 3= 35 3

= 1

E / = 5= 34 3

= 2

= 1= 8 3

= 1

Mission Components

C 6 EC

C



Chemical propulsion (Isp- 342 s, LOX/LH2)From LEO to EML2-40 mt of dry mass ~ 35 mt of propellantTotal Mission mass = 75 mtLOX= 30mT LH2= 5 mT

Bimodal Nuclear Thermal Reactor - BNTR (Isp – 945 s, LH2)From LEO to EML2-40 mt of dry mass ~ 30mt of propellantTotal Mission mass = 70mtLH2= 30 mT

LH2 has a very Low density as compared to LOX.NTR propulsion requires twice the number of launches required in Chemicalpropulsion.

Alternative approachStarting the mission from ISS.

EML2 M D P



EML2 Mission Design – Catalog application



E 2 H

E

1(F9)

2(FH)

3(A )

4(FH)

1 = E

2 = 3 = H , ,

4 = C D

E

D D E 2E ∆ V = 4.25km/s

D

A E

L2 Mission Architecture

6

∆ = 3.4 /D = 6.2

1



EML2 Mission Design - Catalog



25

8.7

EML2- Station

E / AB

HAB



EML2 Station - Halo Orbit



EML2 Station - Performing EVA



EML2 Station - Future Extension

D



( 3) ( )C.A. G F 13 1677C.A. 3 137C.A. C 1 20

C.A. & P 2 50

C.A. H 2 77C.A. O & 1 80C.A. M / A H A 3 245C.A. P 1 25

C.A. C H C 2 75E. . G , N C 2 350

E. . E P 2 1200E. . C 2 300E. . C 2 200E. . C D H 2 100E. . A 1 100

E. . ECL 5 800E. . M 3 3000E. . O ( , H , ) 10 400

54 8836

HAB M



HAB



HAB M



HAB D C

M

M

L

HAB E



HAB HAB E A D

D H

HAB E



HAB D



C = 10 3F = 15 3F = 3.5 3

= 28.5 3

D H = 3 3

HAB D

L

D H

L L

= 67 3

= 9 = 61 3

C = 8 3F = 0F = 16 3

= 24 3

= 5.5 3

HAB I M



H E

G

A

C&

C &C

HAB I M

HAB I M



E A

A

C

C &C

C

C

HAB I M

HAB I M



HAB I M

C &C

&A

&A

HAB I L M



HAB I L M

H

D

& G

H

C

H

EC

A &

3D



3D

H E

G

D

C

3D



3D

H

3D



C

B



L 3D



H E

D H

G

C

EC

C

C

C



A



C



P C C



C C

P C C



C C

P C C



C C

20

C





C C



C & C

E N G



E

A D

G

E N G



E A

C

C



L A



C

F M



L M



& G

L M



& G

P



H







A



B , B B .

NA A .

.

.



1. , D., M C , ., C , J., L , M. "F A M M F M 2018 FI O," . A I , 2013

2. , A. . "E L ." A & 3. B , B N (BN )

4. M , L L . K

5. D N , L F (L2) A E M , L M ,N , 2011

6. H , M C , C ! B , IC A

7. A. H , B , O , A A8. J D , I P M B B

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L2 Mission and Habitat Design

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