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Goddard Main File

# Goddard Main File - GODDARD FINAL PROJECT C OLE P...

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G ODDARD F INAL P ROJECT C OLE P AGE %Goddard Problem Main File %MAE 2117 %Cole Page %May 3rd 2011 clc %A program that simulates the motion of a sounding rocket. global g_sealevel %reference value sea level global r_earth %radius of earth global rho_zero %density at sea level global scale_hgt %scale height global s_ref %reference area global cd %drag coefficient global thrust %thrust global m_dot %rate of mass change m_i = 200; %initial mass m_f = 100; %final mass t_b = 50; %Burn time. i_sp = 300; %Specific impulse s_ref = .196349541; %reference area cd = .2; %drag coefficient rho_zero = 0.002377; scale_hgt = 23800.0; g_sealevel = 32.17405; r_earth = 2.092567257e7; zero = 0.0; two = 2.0; %The program prints to the file "Sound.prt" n_states = 3; print_increment = 2.0; states(1) = 0; states(2) = 0; states(3) = m_i/g_sealevel; time = 0; %set initial time to zero

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delta_t = input('Please enter the integration time step'); if (delta_t > print_increment) print_increment = delta_t; end %setup initial given equations for mass change and thrust m_dot = (m_f - m_i)/g_sealevel/t_b; thrust = -m_dot*g_sealevel*i_sp; fid = fopen('Sound.dat','a'); fprintf(fid,'Time Altitude Velocity Weight\n'); fprintf(fid,' (ft) (ft/sec) (lb)\n'); fprintf(fid,'==== ======== ======== ======\n'); fprintf(fid,'%f %f %f %f
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