sim_nozzle.h File Reference

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Functions
void	sim_nozzle_init (void)
float	sim_nozzle_cycle (float dt)
void	sim_nozzle_set_power (float P)

Function Documentation

sim_nozzle_init()

void sim_nozzle_init

(

void

)

                           {
    sim_nozzle.C = 10.4F; // [J/K] total heat capacity of entire heat block
    sim_nozzle.R = 22.0F; // [K/W] absolute thermal resistance between heat block and ambient
    sim_nozzle.Cs = 0.6F; // [J/K] total heat capacity of sensor
    sim_nozzle.Rs = 9.0F; // [K/W] absolute thermal resistance between sensor and heat block
    sim_nozzle.Ta = 298.15F; // [K] ambient temperature
    sim_nozzle.T = sim_nozzle.Ta; // [K] heat block temperature (avg)
    sim_nozzle.Ts = sim_nozzle.T; // [K] sensor temperature (avg)
    sim_nozzle.P = 0; // [W] heater power
    sim_nozzle.Ex = 0.2; // [J/mm] extrussion energy factor
    sim_nozzle.vex = 0; // [mm/s] extrussion speed
}

sim_nozzle_cycle()

float sim_nozzle_cycle

(

float

dt

)

                                 {
    float E = sim_nozzle.C * sim_nozzle.T; //[J] total heat energy stored in heater block
    float Es = sim_nozzle.Cs * sim_nozzle.Ts; //[J] total heat energy stored in sensor
    float Pl = (sim_nozzle.T - sim_nozzle.Ta) / sim_nozzle.R; //[W] power from heater block to ambient (leakage power)
    float Ps = (sim_nozzle.T - sim_nozzle.Ts) / sim_nozzle.Rs; //[W] power from heater to sensor
    float Ed = (sim_nozzle.P - (Pl + Ps)) * dt; //[J] heater block energy increase
    float Esd = (Ps * dt); //[J] sensor energy increase
    float Ex = (sim_nozzle.Ex * sim_nozzle.vex * dt);
    Ed -= Ex;
    E += Ed; //[J] heater block result total heat energy
    Es += Esd; //[J] sensor result total heat energy
    sim_nozzle.T = E / sim_nozzle.C; //[K] result heater temperature
    sim_nozzle.Ts = Es / sim_nozzle.Cs; //[K] result sensor temperature
    return sim_nozzle.Ts;
}

sim_nozzle_set_power()

void sim_nozzle_set_power

(

float

P

)

                                   {
    sim_nozzle.P = P;
}

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