1 Ariane 5 1 Ariane 5 Flight 501 1 2 History 2 3 Why Ariane - - PowerPoint PPT Presentation

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1 Ariane 5 1 Ariane 5 Flight 501 1 2 History 2 3 Why Ariane - - PowerPoint PPT Presentation

Jan 03, 2023 218 likes •1.03k views

1 Ariane 5 1 Ariane 5 Flight 501 1 2 History 2 3 Why Ariane 5? 3 Why Ariane 5? Program initiated in 1987 3 Why Ariane 5? Program initiated in 1987 Evolutive 3 Why Ariane 5? Program initiated in 1987

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SLIDE 1

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SLIDE 2

Ariane 5

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SLIDE 3

Ariane 5

Flight 501

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SLIDE 4

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SLIDE 5

History

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SLIDE 6

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SLIDE 7
  • Why Ariane 5?

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SLIDE 8
  • Why Ariane 5?
  • Program initiated in 1987

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SLIDE 9
  • Why Ariane 5?
  • Program initiated in 1987
  • Evolutive

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SLIDE 10
  • Why Ariane 5?
  • Program initiated in 1987
  • Evolutive
  • Now number one world luncher

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SLIDE 11

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SLIDE 12

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SLIDE 13

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SLIDE 14

Costs

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SLIDE 15

Costs

  • 130 000 000 € / 10 000 kg

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SLIDE 16

Costs

  • 130 000 000 € / 10 000 kg
  • US$370 million

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SLIDE 17

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SLIDE 18

What happened?

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SLIDE 19

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SLIDE 20

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SLIDE 21

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SLIDE 22

Architecture

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SLIDE 23

Inertial Platform

Architecture

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SLIDE 24

IGC 2 Inertial Platform

Architecture

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SLIDE 25

IGC 2 IGC 1 Inertial Platform

Architecture

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SLIDE 26

IGC 2 IGC 1 Inertial Platform OBC 2

Data Bus

Architecture

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SLIDE 27

IGC 2 IGC 1 Inertial Platform OBC 2 OBC 1

Data Bus

Architecture

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SLIDE 28

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SLIDE 29

Chronology

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SLIDE 30

Chronology

  • H0 + 37 : Trajectory angle > 20°

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SLIDE 31

Chronology

  • H0 + 37 : Trajectory angle > 20°
  • Solid Rocket Booster Separation

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SLIDE 32

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SLIDE 33

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SLIDE 34
  • H0 + 37 : Trajectory angle > 20°
  • Solid Rocket Booster Separation

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SLIDE 35
  • H0 + 37 : Trajectory angle > 20°
  • Solid Rocket Booster Separation
  • Self destruction!

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SLIDE 36

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SLIDE 37
  • H0 + 37 : Trajectory angle > 20°
  • Solid Rocket Booster Separation
  • Self destruction!

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SLIDE 38
  • H0 + 37 : Trajectory angle > 20°
  • Solid Rocket Booster Separation
  • Self destruction!
  • Brutal Nozzle Inclination

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SLIDE 39

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SLIDE 40

Ariane 5 - Vulcain 2

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SLIDE 41

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SLIDE 42
  • Brutal Nozzle Inclination
  • H0 + 37 : Trajectory angle > 20°
  • Solid Rocket Booster Separation
  • Self destruction!

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SLIDE 43
  • Brutal Nozzle Inclination
  • H0 + 37 : Trajectory angle > 20°
  • Solid Rocket Booster Separation
  • Self destruction!
  • OBC gives Nozzle Inclination Order based
  • n IGC2’s informations which were

misinterpreted.

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SLIDE 44

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SLIDE 45
  • OBC gives Nozzle Inclination Order based
  • n IGC2’s informations, which were

misinterpreted.

  • Brutal Nozzle Inclination
  • H0 + 37 : Trajectory angle > 20°
  • Solid Rocket Booster Separation
  • Self destruction!

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SLIDE 46
  • OBC gives Nozzle Inclination Order based
  • n IGC2’s informations, which were

misinterpreted.

  • Brutal Nozzle Inclination
  • H0 + 37 : Trajectory angle > 20°
  • Solid Rocket Booster Separation
  • Self destruction!
  • IGC 2 sends a sequence of bits which meant

IGC failure

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SLIDE 47

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SLIDE 48
  • IGC 2 sends a sequence of bits which

meant IGC failure

  • OBC gives Nozzle Inclination Order based
  • n IGC2’s informations, which were

misinterpreted.

  • Brutal Nozzle Inclination
  • H0 + 37 : Trajectory angle > 20°
  • ....
  • Self destruction!

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SLIDE 49
  • IGC 2 sends a sequence of bits which

meant IGC failure

  • OBC gives Nozzle Inclination Order based
  • n IGC2’s informations, which were

misinterpreted.

  • Brutal Nozzle Inclination
  • H0 + 37 : Trajectory angle > 20°
  • ....
  • Self destruction!
  • IGC 2 shuts down thanks to a software
  • exception. It tries to switch on IGC 1.

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SLIDE 50

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SLIDE 51
  • SRI 2 shuts down thanks to a software
  • exception. It tries to switch on SRI 1.
  • SRI 2 sends a sequence of bits which meant

SRI failure

  • OBC gives Nozzle Inclination Order based
  • n IGC2’s informations, which were

misinterpreted.

  • Brutal Nozzle Inclination
  • H0 + 37 : Trajectory angle > 20°
  • ....

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SLIDE 52
  • SRI 2 shuts down thanks to a software
  • exception. It tries to switch on SRI 1.
  • SRI 2 sends a sequence of bits which meant

SRI failure

  • OBC gives Nozzle Inclination Order based
  • n IGC2’s informations, which were

misinterpreted.

  • Brutal Nozzle Inclination
  • H0 + 37 : Trajectory angle > 20°
  • ....
  • SRI 1 already down thanks to the

same software exception.

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SLIDE 53

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SLIDE 54

The software failure

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The software failure

declare vertical_veloc_sensor: float; horizontal_veloc_sensor: float; vertical_veloc_bias: integer; horizontal_veloc_bias: integer; ... begin declare pragma suppress(numeric_error, horizontal_veloc_bias); begin sensor_get(vertical_veloc_sensor); sensor_get(horizontal_veloc_sensor); vertical_veloc_bias := integer(vertical_veloc_sensor); horizontal_veloc_bias := integer(horizontal_veloc_sensor); ... exception when numeric_error => calculate_vertical_veloc(); when others => use_irs1(); end; end irs2;

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SLIDE 57

The unprotected variable

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SLIDE 58

The unprotected variable

  • 80% maximum charge for the IGC

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The unprotected variable

  • 80% maximum charge for the IGC
  • Need to find out which variables to protect

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SLIDE 60

The unprotected variable

  • 80% maximum charge for the IGC
  • Need to find out which variables to protect
  • The HVB variable was not considered

dangerous...

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The unprotected variable

  • 80% maximum charge for the IGC
  • Need to find out which variables to protect
  • The HVB variable was not considered

dangerous...

  • ...but the Ariane 5 trajectory data was not

in the IGC’s spec file!

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SLIDE 62

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SLIDE 63

Ariane’s reaction to exceptions

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Ariane’s reaction to exceptions

  • Send a sequence of bits on the bus defining

the error

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Ariane’s reaction to exceptions

  • Send a sequence of bits on the bus defining

the error

  • Save the context in an EEPROM

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Ariane’s reaction to exceptions

  • Send a sequence of bits on the bus defining

the error

  • Save the context in an EEPROM
  • /!\ Shut down the IGC /!\

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SLIDE 68
  • Untreated exceptions are obviously

raised because of a hardware failure...

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SLIDE 69
  • Untreated exceptions are obviously

raised because of a hardware failure...

  • ...but not this time!

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SLIDE 70

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SLIDE 71

The Mistakes

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SLIDE 72

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Ariane 4 code Re-use

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SLIDE 74

Ariane 4 code Re-use

  • IGC code was re-used code from Ariane 4

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SLIDE 75

Ariane 4 code Re-use

  • IGC code was re-used code from Ariane 4
  • Software exception caused by a useless

program!

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SLIDE 76

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SLIDE 77

...and one missing test

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SLIDE 78

...and one missing test

  • ...which was not considered useful, because

the ariane 5 trajectory not mentioned in the IGC’s spec file!

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SLIDE 79

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