Space Systems Engineering at Cranfield University | Flashcards & Summaries

Lernmaterialien für Space Systems Engineering an der Cranfield University

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Which pointing mode is the most accurate?

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The reaction wheels are the most accurate control methods.

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Which sensors are used to determine the orientation of the spacecraft in space?

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  • Sun sensor
  • Horizon sensor
  • Star sensors (most accurate)
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Thermal passive control techniques

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  • Surface finish (paints, tapes)
  • Radiators and cold plates
  • Passive heat pipes
  • Multilayer insulation
  • Phase-change devices (paraffin)
  • Conductive filles/ Thermal insulators
Lösung ausblenden
TESTE DEIN WISSEN

Attitude Control Design Process:


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  • Define control modes (and their requirements)
  • Select attitude control mode
  • Quantify disturbance environment
  • Select and size ADCS hardware
  • Define determination and control algorithms
Lösung ausblenden
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What are the external disturbance torques in space?

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  • Aerodynamic drag
  • Solar radiation pressure
  • Gravity gradient torques
  • Magnetic field torques
  • Internal disturbances torques
Lösung ausblenden
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Typical parameters used in trade-off analyses:

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  • Mass
  • Power
  • Size
  • Cost
  • Reliability
  • Performance
  • Mission-Specific parameters (e.g. from
    science)
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Data Interface parameters:

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  • Data format
  • Signal characteristics (analogue/digital, levels, reference)
  • Grounding
  • Cable and connector characteristics (including connector pin-outs)
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Radioisotope Thermal Generator (RTG) advantages:

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TESTE DEIN WISSEN
  • Sunlight-independent
  • Long-lasting
  • Tolerant of cold and radiation
  • Higher power densities than solar array/battery systems
  • No moving parts/fluids
  • Safe, flight-proven
Lösung ausblenden
TESTE DEIN WISSEN

Who pays for the Space projects?

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Civil, Military, Commercial

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To withstand the launch environment, the structure must have sufficient:

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TESTE DEIN WISSEN

o Strength – to survive axial and lateral accelerations (steady-state & transient)
o Stiffness – to make spacecraft natural frequency higher than launcher natural frequencies
(also must avoid deflections outside launch envelope)
o The structure must also allow the spacecraft to be attached to the launcher, and to fit
within its fairing

Lösung ausblenden
TESTE DEIN WISSEN

Software interface parameters:

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TESTE DEIN WISSEN
  • Data sources and destinations
  • Data definition and format
  • Initiating conditions and “Handshaking”
  • Communication characteristics
  • Timing
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TESTE DEIN WISSEN

Sun Synchronous orbit

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TESTE DEIN WISSEN
  • Near polar orbit so flies over most of Earth surface
  • Inclination chosen so Earth oblateness causes orbit plane to rotate at same rate that the Earth goes around the Sun – Orbit plane maintains same angle to solar vector
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  • 277 Karteikarten
  • 11 Studierende
  • 1 Lernmaterialien

Beispielhafte Karteikarten für deinen Space Systems Engineering Kurs an der Cranfield University - von Kommilitonen auf StudySmarter erstellt!

Q:

Which pointing mode is the most accurate?

A:

The reaction wheels are the most accurate control methods.

Q:

Which sensors are used to determine the orientation of the spacecraft in space?

A:
  • Sun sensor
  • Horizon sensor
  • Star sensors (most accurate)
Q:

Thermal passive control techniques

A:
  • Surface finish (paints, tapes)
  • Radiators and cold plates
  • Passive heat pipes
  • Multilayer insulation
  • Phase-change devices (paraffin)
  • Conductive filles/ Thermal insulators
Q:

Attitude Control Design Process:


A:
  • Define control modes (and their requirements)
  • Select attitude control mode
  • Quantify disturbance environment
  • Select and size ADCS hardware
  • Define determination and control algorithms
Q:

What are the external disturbance torques in space?

A:
  • Aerodynamic drag
  • Solar radiation pressure
  • Gravity gradient torques
  • Magnetic field torques
  • Internal disturbances torques
Mehr Karteikarten anzeigen
Q:

Typical parameters used in trade-off analyses:

A:
  • Mass
  • Power
  • Size
  • Cost
  • Reliability
  • Performance
  • Mission-Specific parameters (e.g. from
    science)
Q:

Data Interface parameters:

A:
  • Data format
  • Signal characteristics (analogue/digital, levels, reference)
  • Grounding
  • Cable and connector characteristics (including connector pin-outs)
Q:

Radioisotope Thermal Generator (RTG) advantages:

A:
  • Sunlight-independent
  • Long-lasting
  • Tolerant of cold and radiation
  • Higher power densities than solar array/battery systems
  • No moving parts/fluids
  • Safe, flight-proven
Q:

Who pays for the Space projects?

A:

Civil, Military, Commercial

Q:

To withstand the launch environment, the structure must have sufficient:

A:

o Strength – to survive axial and lateral accelerations (steady-state & transient)
o Stiffness – to make spacecraft natural frequency higher than launcher natural frequencies
(also must avoid deflections outside launch envelope)
o The structure must also allow the spacecraft to be attached to the launcher, and to fit
within its fairing

Q:

Software interface parameters:

A:
  • Data sources and destinations
  • Data definition and format
  • Initiating conditions and “Handshaking”
  • Communication characteristics
  • Timing
Q:

Sun Synchronous orbit

A:
  • Near polar orbit so flies over most of Earth surface
  • Inclination chosen so Earth oblateness causes orbit plane to rotate at same rate that the Earth goes around the Sun – Orbit plane maintains same angle to solar vector
Space Systems Engineering

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