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Model Description

This code is used to determiner the trajectory of the rocket. The model is a one dimensional model. It takes the Motor thrust curve as input and outputs the displacement, velocity, and position of the rocket for the entire flight. This model may be used to determine apogee, optimize mass, find max velocity, determine the velocity off the launch stand, give max loads, mach numbers, optimize the thrust curve, and much more.

Main Scripts

  • MarsRocket.m : this is the main file of the model. All of the other files are called from this one. This file steps through time and updates the mass, position, velocity, and acceleration of the rocket. It refferences the thrust curve and the drag coefficient curve of the rocket to calculate the forces. The drag on the rocket also depends on the mach number (which is a function of pressure, density, temperature) so much of the calculations are simply calculating the speed of sound in air for a given altitude.

  • SuperLokiTester.m: this is a replica of the MarsRocket model, but contains the size and weight of the Super loki rocket

Important Auxiliary functions

  • rockeq_var: this is where the equations are actually solved

  • ThrustCurveSH: This is where the model refferences the thrust curve of the roket (the thrust curve is plugged in manually in vector form)

  • Cd.m: This function outputs the drag coefficient for a given velocity, flight stage, and altitude. This function holds vectors of all of the drag coefficient information we have on the rocket. this is where you would update the drag coefficient vs mach number information.

Aerodynamics Functions

  • Cd.m: This function outputs the drag coefficient for a given velocity, flight stage, and altitude. This function holds vectors of all of the drag coefficient information we have on the rocket. this is where you would update the drag coefficient vs mach number information.

  • NoseConeDrag.m: loads and plots information from dozens of CSV files ocntaining data from the nosecone simulations in Rasaero

  • c_atm: returns the speed of sound for a given altitude

  • MaxQ.m plots aerodynamic pressure over time and outputs the maxQ pressure

  • mu_atm.m: returns viscocity of air at a given altitude

  • nu_atm.m: returns kinematic viscocity

Atmosphere calculations (not really important to understand)

  • AtmosTable.mat: this table contains a lookup table for all atmosphere specs for a given altitude. The rest of the functins in this section are used to create this lookup table

  • atmo.m: USes all of the atmosphere things below and outputs all atmosphere information for a given composition

  • atmo_p.m: returns partial pressures at a given alt and temp

  • atmo_temp.m: outputs the temperature [K] at a given altitude

  • atmo_compo.m: returns atmosphere composition at a given altitude. Currently not used in this sim

  • GenAtmosTable.m: uses all the atmosphere functions to generate an atmosphere table.

  • k_atm.m outputs the thermal conductivity of air at a given altitude

  • P_atm.m: returns the pressure for a given altitude

  • rho_atm: returns the density for a given altitude

  • T_atm.m returns the temperature for a given altitude