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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 05:27:41 -0500

yes with your numbers it is now at 5 min. and still going.
try putting in a small number for your zeros

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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