🚀 2-DOF Flight Simulation Model for Sounding Rockets

2DOF Sounding Rocket Modeling with Simulink

🔧 Model Components

1. Thrust Model

• Time-dependent thrust is implemented using a 1D lookup table.
• Propellant mass flow rate is computed from thrust and specific impulse (Isp).
• Instantaneous rocket mass is updated in real time based on burn time and flow rate.

2. Aerodynamic Drag Force Model

• The drag coefficient (Cᴅ) can be defined in two alternative ways:
• 1D Lookup Table: where Cᴅ is a function of Mach number only
• 2D Lookup Table with Prelookup blocks: where Cᴅ depends on both Mach number and altitude
• Users can switch between these options depending on the fidelity of their CFD data or simulation needs.

3. Atmospheric Model

• Uses Standard Atmosphere Model (ISA) from Aerospace Blockset
• Calculates temperature, pressure, density (ρ), and speed of sound (a) based on altitude
• Required for accurate Mach and drag force computation

4. Equations of Motion

• Flight dynamics are modeled in 2D, aligned with the velocity vector
• Governed by Newton’s laws, the simulation integrates both translational and vertical accelerations:

5. Flight Phase Logic

• Apogee detection is implemented by monitoring vertical velocity (Vz) and triggering a stop condition when Vz =< 0

📌 Notes

• This simulation is intended as a baseline reference model. Teams are expected to update Cᴅ tables (Mach, Altitude) with data from their own rocket geometries, preferably obtained through CFD or wind tunnel tests.
• All units follow SI (MKS) standards.
• Requires MATLAB + Simulink + Aerospace Blockset to run.

👩🚀 Who Is This For?

• University-level rocket competition teams
• Aerospace or mechanical engineering students
• Educators teaching model-based design and flight dynamics
• CFD or propulsion simulation enthusiasts