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  • A-1

    Appendix A

    Epsilon User’s Manual

    Appendix A

    PAF-937M Interface

    This appendix describes PAF-937M Interface.

    The separation system, PAF-937M, features a Marman clamp band with a diameter of 937 mm and a

    low shock separation mechanism (LSSM) with a non-pyrotechnic device.

    band

    LSSM

    Φ937

    BandCatcher

    Marman Clamp Band of PAF-937M

  • A-2

    Appendix A

    Epsilon User’s Manual

    A1. Details of Mounting Position

    Distances from STA* to the separation plane are as follows:

    ・For single launch STA 6698.5 mm

    ・For multi launch STA 5238.5 mm

    *STA (station): The origin is at the top of the fairing, from which distances are measured in a

    longitudinal direction of LV, or along XB axis. The figure increases toward lower stages.

    The coordinate system in this document is the same as shown in Chapter 2.2. The origin is at the

    center of the separation plane.

    A2. PL Usable Volume

    PL usable volume is defined in Chapter 4.1.1.

    The usable volume for PL in single launch is shown in Figure 4-1.

    The usable volume for Small satellite in multi launch is shown in Figure A2-1.

    Figure A2-1 PL Usable Volume (multi launch)

    [mm]

    Separation plane STA

    5238.5

    φ600 1 0 0

    φ236

    3 9 3 5

    1 3 9 8

    1 0 0

    φ959

    φ1850

    Small satellite

    (multi launch)

  • A-3

    Appendix A

    Epsilon User’s Manual

    A3. Mechanical Interface

    (1) Configuration of PAF (LV side)

    The separation mechanism of PAF-937M is shown in Table A3-1.

    The cross section of the separation flange is shown in Figure A3-1.

    The locations of separation springs, separation switches and separation connectors are shown in

    Figure A3-2.

    Table A3-1 Separation Mechanism of PAF-937M

    Separation Method Separation Spring

    Clamp Marman Clamp band

    Others Separation Switch (micro switch)

    Separation Connector

    Band Catcher

    Figure A3-1 Cross Section of Separation Flange around Separation Plane

    0° line-marking

  • A-4

    Appendix A

    Epsilon User’s Manual

    [TOP VIEW]

    Figure A3-2 Locations of Separation Springs ,Separation Switches and Separation Connectors on

    Separation Flange (LV side)

    A

    B

    Master Key

    Master Key

    B

    A

    +XB

    +YB

    (395)

    [mm]

    (395)

    (4 8

    0 )

    (4 8

    0 )

    90°

    180°

    270°

    UMB1

    UMB2

    Separation Connector Attached Position

    Separation Connector Attached Position

    Marman Clamp Band Separation Phase(90-270°)

    Spring Actuators Position (12 positions Max)

    Separation Sensor on SC Contacted Position

    Low Shock Separation Mechanism (LSSM)

    Band Catcher (10 positions)

    Separation Sensor on SC Contacted Position

    Separation Sensor on LV

    Separation Sensor on LV

    Separation Connector

    Separation Switch on PL side

    YB

    Separation Switch on PL side

    Separation Spring

    Separation Switch on LV side

    ZB

    Separation Switch on LV side

    Separation Connector

  • A-5

    Appendix A

    Epsilon User’s Manual

    (2) PL’s Rear Frame

    The load applied to PL’s rear flame by a separation spring during PL/LV mating dose not exceed 1,400

    N.

    PL’s rear frame shall satisfy the following requirements.

     Material : Aluminum alloy

     Area : A ≧ 347.3 [mm2]

     Moment of inertia of area : Izz ≧ 16130.1 [mm4], Iyy ≧ 12365.2 [mm4]

     Length : L = 25 [mm]

    PL’s rear frame and PAF’s separation flange are joined by a Marman clamp band. Its typical

    specifications are as follows:

     Tension : 18 [kN] or less

    (temporarily rises up to 35 kN during clamping work.)

     Phase of Separation Mechanism Location: 90° (in LV coordinate system)

    The details of PL’s rear frame are described in ICD.

    The typical examples are shown as follows:

    ・Cross section of PL’s rear frame around the separation plane : Figure A3-3

    ・Contact surface with an LV separation spring : Figure A3-4

    *XB: the longitudinal axis of LV body (See Chapter 2.2)

    Figure A3-3 Typical Cross Section of PL’s Rear Frame around Separation Plane

    R 5 .1 ± 0 .5

    R 2. 28 ± 0. 25

    R 0 .7 ± 0 .2 5

    XB

    0°位相の フランジ端面に けびき線を 施工のこと

    0° line

    marking

  • A-6

    Appendix A

    Epsilon User’s Manual

    Figure A3-4 Typical Contact Surface with LV Separation Spring

    衛星分離面

    Φ825.5

    分離スプリング接触面中心

    φ7 0

    Separation plane

    Center of the contact surface with a LV Separation spring

  • A-7

    Appendix A

    Epsilon User’s Manual

    (3) Material for Mating Section

    The standard material for the mating section is shown in Table A3-2.

    Table 4-2 Material for Mating Section

    PL side LV side

    Aluminum alloy Aluminum alloy

    (4) Coating on Mating Section

    The standard coating on the mating section is shown in Table 4-3.

    Table 4-3 Coating on Mating Section

    PL side LV side

    Chemical Conversion Coating

    MIL-C-5541 class 3

    Chemical Conversion Coating

    MIL-C-5541 class 3

    (5) Separation Connector

    The side view of a separation connector after mating are shown in Figure A3-5.

    The layout of PL’s separation connectors on the YB-ZB plane are shown in Figure A3-6.

    Insert normal and clocking (keying) positions of PL’s separation connectors are also shown in Figure

    A3-6. If any change is needed, contact your Program Director.

    The specifications of separation connectors are described in the next chapter A4.

  • A-8

    Appendix A

    Epsilon User’s Manual

    Figure A3-5 Side View of Mated Separation Connector

    Figure A3-6 Layout and Insert Normal/Clocking Positions of PL’s Separation Connectors

    (6 4.

    15 ±

    0. 2m

    m fr

    o m

    s ep

    ar at

    io n

    pl an

    e )

    C he

    ck d

    im en

    si o n

    af te

    r m

    at in

    g 12

    .6 5±

    0. 9m

    m

    M A

    T E D

    U N

    M A

    T E D

    SC side DBAS70-61

    LV side DBAS79 61

    Reference Plane Reference Plane

    In the case of Panel Front Mount

    In the case of Panel Rear Mount

    C he

    ck d

    im en

    si o n

    af te

    r m

    at in

    g (S

    et d

    ep en

    ds o

    n cu

    st o m

    er ’s

    d es

    ig n )

    M A

    T E D

    (6 4.

    15 ±

    0. 2m

    m fr

    o m

    s ep

    ar at

    io n

    pl an

    e )

    UMBJ1

    UMBJ2

    270° 90°

    180°

    +XB

    +YB DBAS70 61-0SN-090DBAS70 61-0SY-090

    Insert Clocking Position (Insert vertical axis is in

    the clocking position Y**)

    Master Key

    Master Key

    [BOTTOM VIEW]

    *Though the dimension tolerance of the center of separation connectors is needs to design SC for the customer, these dimensions are reference value because it is difficult to measure. Compatibility will be confirmed at the Fit check. **use 2 separation connecters having different type of insert for prevention connecting UMBJ1 and UNBJ2 alternately.

    (395±0.5mm) *

    ( 4

    8 0 ±

    0. 5m

    m )*

    (395±0.5mm) *

    ( 4

    8 0 ±

    0. 5m

    m )*

    UMBJ2

    UMBJ1

    Insert Clocking Position (Insert vertical axis is in the normal position**)

    PL side

    D

    is ta

    n c e a ft

    e r

    m a ti n g

    (d e p e n d s o n P

    L p a n e l

    th ic

    k n e s s )

    *The dimension tolerance of the center should be taken into consideration for PL design; however, due to difficulty in precise measurement, these figures are just for reference. The compatibility is confirmed by Fit Check. **The 2 separation connectors UMBJ1 and UMBJ2 are different in insert keying/clocking position to prevent incorrect connection.

    YB

    ZB Insert Clocking Position:

    Y (75°): The insert is

    rotated 75° clockwise.

    Insert Normal Position:

    N (0°)

    Master keyway

    D is

    ta n c e

    a ft

    e r

    m a

    ti n

    g

  • A-9

    Appendix A

    Epsilon User’s Manual

    (6) Separation Switch (Micro Switch)

    Separation switches, which detect PL/LV separation status, are installed on LV side (PAF). More

    switches can be mounted on PL side (PL rear frame) if needed. The standard number of the switches is 2