Sumários

Attitude Determination and Control Systems (III)

15 Dezembro 2022, 08:00 • André Maria da Silva Dias Moitinho de Almeida

:: Disturbing torques
- External: gravitational gradients, solar pressure, magnetic, dragging etc.
- Internal: misalignments, movements of appendages, movements of liquids, etc.
- Secular

:: Sensors and actuators
- Types of sensors (Earth, Sun, stellar, inertial, magnetic, GPS)
- Types of passive actuators (rotation, gravity, magnetic, shock absorbers)
- Types of active actuators (reaction wheels, gyros, propellers, magnetic torque rods)

ESA Project (IV)

13 Dezembro 2022, 09:00 • André Maria da Silva Dias Moitinho de Almeida

Presentation of ongoing students works

Discussion of proposal contents:

- technical solutions

- work break down structure

Close out action/recommendations for the works.

Attitude Determination and Control Systems (II)

13 Dezembro 2022, 08:00 • André Maria da Silva Dias Moitinho de Almeida

:: Determination of attitude
- Sensors (introduction)
- Estimation and calculations
- Representation of attitude: Euler angles, cosine directors, quaternions

:: Control strategies
- Gravity gradient stabilization
- Mono-axial, dual-spin
- Tri-axial rotation

ESA Project (III)

6 Dezembro 2022, 09:00 • André Maria da Silva Dias Moitinho de Almeida

- Basic principles for business and implementation proposal. Topics discussed:
Target product
Target segment
Competitiveness difference
Market survey
Market share

- Presentation and discussion of a case study for an satellite electric propulsion system development.
- Short discussion on satellite propulsion systems.
Presentation from each group – 10 min followed 5 min discussion

Definition of Action Items for each group for next class.

Attitude Determination and Control Systems (I)

6 Dezembro 2022, 08:00 • André Maria da Silva Dias Moitinho de Almeida

:: What is an Attitude Determination and Control System (ADCS)
- What is attitude?
- Why determine and control?
- Requirements and constraints
- Control loop