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Re: How Come My Program Won't Work?

 From: Doug Stewart Subject: Re: How Come My Program Won't Work? Date: Sat, 12 Mar 2016 05:37:41 -0500

On Sat, Mar 12, 2016 at 5:27 AM, Doug Stewart wrote:
yes with your numbers it is now at 5 min. and still going.
try putting in a small number for your zeros

that did not change  the time!!!!!  wow this is the ode45 doing its work.
You could set the tolerances larger

On Sat, Mar 12, 2016 at 4:18 AM, Bear wrote:
m_p = 0.003; %mass of pellet ( kg )
m_s = 0.050; %mass of spring piston + 1/3 spring mass ( kg )
r_piston = 0.023; %radius of spring piston in air gun ( m )
c = 1.7272; %caliber ( m )
R = 0; %twist rate of rifling ( 1/m )
f_e = 0; %experimentally quantified elastic compression friction force for
pellet-style ( N )
mu = 0.3; %kinetic coeficient of friction between pellet and barrel
materials
I_p = 0.00223741488; %mass moment of inertia of pellet along its
lognitudinal central axis ( kg*m^2 )
g = 9.801; %force of local gravitational feild (use standard earth value for
analysis) ( m/(kg*s^2) )
P_o = 1.013*10^5; %local atmospheric pressure (normally set at see level for
analysis) ( Pa )
V_o = 0.000006554826; %Volume of air in cylinder when the air gun is
"cocked" ( m^3 )
k = 3000; %spring constant ( N/m )
x_s_f = 0.3226; %compression of spring assembly after cocking ( m )
x_s_o = 1; %compression of spring assembly before cocking ( m )
barrel_length = 1; % ( m )

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