Sumários
Propulsion systems (I)
25 Novembro 2025, 08:00 • André Maria da Silva Dias Moitinho de Almeida
- Introduction
- Propulsion purposes and requirements
- Types and comparison of propulsion systems
- The rocket equation
- Effects of rocket nozzle expansion
Attitude Determination and Control Systems (III)
20 Novembro 2025, 11:30 • 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
18 Novembro 2025, 09:00 • André Maria da Silva Dias Moitinho de Almeida
- Explanation of the ESA project sessions organisation
- Introduction to ESA OSIP platform and to space projects.
- Introduction to the GSTP program
- Formation of groups
- Definition of Action Items on groups for next class.
Attitude Determination and Control Systems (II)
18 Novembro 2025, 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
- Disturbing torques
- External: gravitational gradients, solar pressure, magnetic, dragging etc.
- Internal: misalignments, movements of appendages, movements of liquids, etc.
- Secular
Attitude Determination and Control Systems (I)
13 Novembro 2025, 11:30 • André Maria da Silva Dias Moitinho de Almeida
- Introduction to Attitude Determination and Control System (ADCS)
- Attitude and reference frames
- Why determine and control?
- Requirements and constraints
- Control loop