Removed dos line endings.
This commit is contained in:
curt
parent
7cdcfcafb8
commit
e9dba2caa1
2 changed files with 204 additions and 204 deletions
|
|
@ -1,93 +1,93 @@
|
||||||
//#include <ansi_c.h>
|
//#include <ansi_c.h>
|
||||||
//#include <math.h>
|
//#include <math.h>
|
||||||
//#include <stdio.h>
|
//#include <stdio.h>
|
||||||
//#include <stdlib.h>
|
//#include <stdlib.h>
|
||||||
#include "uiuc_ice_rates.h"
|
#include "uiuc_ice_rates.h"
|
||||||
|
|
||||||
///////////////////////////////////////////////////////////////////////
|
///////////////////////////////////////////////////////////////////////
|
||||||
// Calculates shed rate depending on current aero loads, eta, temp, and freezing fraction
|
// Calculates shed rate depending on current aero loads, eta, temp, and freezing fraction
|
||||||
// Code by Leia Blumenthal
|
// Code by Leia Blumenthal
|
||||||
//
|
//
|
||||||
// 13 Feb 02 - Created basic program with dummy variables and a constant shed rate (no dependency)
|
// 13 Feb 02 - Created basic program with dummy variables and a constant shed rate (no dependency)
|
||||||
//
|
//
|
||||||
// Inputs:
|
// Inputs:
|
||||||
// aero_load - aerodynamic load
|
// aero_load - aerodynamic load
|
||||||
// eta
|
// eta
|
||||||
// T - Temperature in Farenheit
|
// T - Temperature in Farenheit
|
||||||
// ff - freezing fraction
|
// ff - freezing fraction
|
||||||
//
|
//
|
||||||
// Output:
|
// Output:
|
||||||
// rate - %eta shed/time
|
// rate - %eta shed/time
|
||||||
//
|
//
|
||||||
// Right now this is just a constant shed rate until we learn more...
|
// Right now this is just a constant shed rate until we learn more...
|
||||||
|
|
||||||
|
|
||||||
double shed(double aero_load, double eta, double T, double ff, double time_step)
|
double shed(double aero_load, double eta, double T, double ff, double time_step)
|
||||||
{
|
{
|
||||||
double rate, eta_new;
|
double rate, eta_new;
|
||||||
|
|
||||||
if (eta <= 0.0)
|
if (eta <= 0.0)
|
||||||
rate = 0.0;
|
rate = 0.0;
|
||||||
else
|
else
|
||||||
rate = 0.2;
|
rate = 0.2;
|
||||||
|
|
||||||
eta_new = eta-rate*eta*time_step;
|
eta_new = eta-rate*eta*time_step;
|
||||||
if (eta_new <= 0.0)
|
if (eta_new <= 0.0)
|
||||||
eta_new = 0.0;
|
eta_new = 0.0;
|
||||||
|
|
||||||
return(eta_new);
|
return(eta_new);
|
||||||
}
|
}
|
||||||
|
|
||||||
|
|
||||||
///////////////////////////////////////////////////////////////////////////////////////////////////
|
///////////////////////////////////////////////////////////////////////////////////////////////////
|
||||||
// Currently a simple linear approximation based on temperature and eta, but for next version,
|
// Currently a simple linear approximation based on temperature and eta, but for next version,
|
||||||
// should have so that it calculates sublimation rate depending on current temp,pressure,
|
// should have so that it calculates sublimation rate depending on current temp,pressure,
|
||||||
// dewpoint, radiation, and eta
|
// dewpoint, radiation, and eta
|
||||||
//
|
//
|
||||||
// Code by Leia Blumenthal
|
// Code by Leia Blumenthal
|
||||||
// 12 Feb 02 - Created basic program with linear rate for values when sublimation will occur
|
// 12 Feb 02 - Created basic program with linear rate for values when sublimation will occur
|
||||||
// 16 May 02 - Modified so that outputs new eta as opposed to rate
|
// 16 May 02 - Modified so that outputs new eta as opposed to rate
|
||||||
// Inputs:
|
// Inputs:
|
||||||
// T - temperature and must be input in Farenheit
|
// T - temperature and must be input in Farenheit
|
||||||
// P - pressure
|
// P - pressure
|
||||||
// Tdew - Dew point Temperature
|
// Tdew - Dew point Temperature
|
||||||
// rad - radiation
|
// rad - radiation
|
||||||
// time_step- increment since last run
|
// time_step- increment since last run
|
||||||
//
|
//
|
||||||
// Intermediate:
|
// Intermediate:
|
||||||
// rate - sublimation rate (% eta change/time)
|
// rate - sublimation rate (% eta change/time)
|
||||||
//
|
//
|
||||||
// Output:
|
// Output:
|
||||||
// eta_new- eta after sublimation has occurred
|
// eta_new- eta after sublimation has occurred
|
||||||
//
|
//
|
||||||
// This takes a simple approximation that the rate of sublimation will decrease
|
// This takes a simple approximation that the rate of sublimation will decrease
|
||||||
// linearly with temperature increase.
|
// linearly with temperature increase.
|
||||||
//
|
//
|
||||||
// This code should be run every time step to every couple time steps
|
// This code should be run every time step to every couple time steps
|
||||||
//
|
//
|
||||||
// If eta is less than zero, than there should be no sublimation
|
// If eta is less than zero, than there should be no sublimation
|
||||||
|
|
||||||
double sublimation(double T, double eta, double time_step)
|
double sublimation(double T, double eta, double time_step)
|
||||||
{
|
{
|
||||||
double rate, eta_new;
|
double rate, eta_new;
|
||||||
|
|
||||||
if (eta <= 0.0) rate = 0;
|
if (eta <= 0.0) rate = 0;
|
||||||
|
|
||||||
else{
|
else{
|
||||||
// According to the Smithsonian Meteorological tables sublimation occurs
|
// According to the Smithsonian Meteorological tables sublimation occurs
|
||||||
// between -40 deg F < T < 32 deg F and between pressures of 0 atm < P < 0.00592 atm
|
// between -40 deg F < T < 32 deg F and between pressures of 0 atm < P < 0.00592 atm
|
||||||
if (T < -40) rate = 0;
|
if (T < -40) rate = 0;
|
||||||
else if (T >= -40 && T < 32)
|
else if (T >= -40 && T < 32)
|
||||||
{
|
{
|
||||||
// For a simple linear approximation, assume largest value is a rate of .2% per sec
|
// For a simple linear approximation, assume largest value is a rate of .2% per sec
|
||||||
rate = 0.0028 * T + 0.0889;
|
rate = 0.0028 * T + 0.0889;
|
||||||
}
|
}
|
||||||
else if (T >= 32) rate = 0;
|
else if (T >= 32) rate = 0;
|
||||||
}
|
}
|
||||||
|
|
||||||
eta_new = eta-rate*eta*time_step;
|
eta_new = eta-rate*eta*time_step;
|
||||||
if (eta_new <= 0.0)
|
if (eta_new <= 0.0)
|
||||||
eta_new = 0.0;
|
eta_new = 0.0;
|
||||||
|
|
||||||
return(eta_new);
|
return(eta_new);
|
||||||
}
|
}
|
||||||
|
|
|
||||||
|
|
@ -1,111 +1,111 @@
|
||||||
// SIS Twin Otter Iced aircraft Nonlinear model
|
// SIS Twin Otter Iced aircraft Nonlinear model
|
||||||
// Version 020409
|
// Version 020409
|
||||||
// read readme_020212.doc for information
|
// read readme_020212.doc for information
|
||||||
|
|
||||||
#include "uiuc_iced_nonlin.h"
|
#include "uiuc_iced_nonlin.h"
|
||||||
|
|
||||||
void Calc_Iced_Forces()
|
void Calc_Iced_Forces()
|
||||||
{
|
{
|
||||||
// alpha in deg
|
// alpha in deg
|
||||||
double alpha;
|
double alpha;
|
||||||
double de;
|
double de;
|
||||||
double eta_ref_wing = 0.08; // eta of iced data used for curve fit
|
double eta_ref_wing = 0.08; // eta of iced data used for curve fit
|
||||||
double eta_ref_tail = 0.12;
|
double eta_ref_tail = 0.12;
|
||||||
double eta_wing;
|
double eta_wing;
|
||||||
//double delta_CL; // CL_clean - CL_iced;
|
//double delta_CL; // CL_clean - CL_iced;
|
||||||
//double delta_CD; // CD_clean - CD_iced;
|
//double delta_CD; // CD_clean - CD_iced;
|
||||||
//double delta_Cm; // CM_clean - CM_iced;
|
//double delta_Cm; // CM_clean - CM_iced;
|
||||||
double delta_Cm_a; // (Cm_clean - Cm_iced) as a function of AoA;
|
double delta_Cm_a; // (Cm_clean - Cm_iced) as a function of AoA;
|
||||||
double delta_Cm_de; // (Cm_clean - Cm_iced) as a function of de;
|
double delta_Cm_de; // (Cm_clean - Cm_iced) as a function of de;
|
||||||
double delta_Ch_a;
|
double delta_Ch_a;
|
||||||
double delta_Ch_e;
|
double delta_Ch_e;
|
||||||
double KCL;
|
double KCL;
|
||||||
double KCD;
|
double KCD;
|
||||||
double KCm_alpha;
|
double KCm_alpha;
|
||||||
double KCm_de;
|
double KCm_de;
|
||||||
double KCh;
|
double KCh;
|
||||||
double CL_diff;
|
double CL_diff;
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
alpha = Alpha*RAD_TO_DEG;
|
alpha = Alpha*RAD_TO_DEG;
|
||||||
de = elevator*RAD_TO_DEG;
|
de = elevator*RAD_TO_DEG;
|
||||||
// lift fits
|
// lift fits
|
||||||
if (alpha < 16)
|
if (alpha < 16)
|
||||||
{
|
{
|
||||||
delta_CL = (0.088449 + 0.004836*alpha - 0.0005459*alpha*alpha +
|
delta_CL = (0.088449 + 0.004836*alpha - 0.0005459*alpha*alpha +
|
||||||
4.0859e-5*pow(alpha,3));
|
4.0859e-5*pow(alpha,3));
|
||||||
}
|
}
|
||||||
else
|
else
|
||||||
{
|
{
|
||||||
delta_CL = (-11.838 + 1.6861*alpha - 0.076707*alpha*alpha +
|
delta_CL = (-11.838 + 1.6861*alpha - 0.076707*alpha*alpha +
|
||||||
0.001142*pow(alpha,3));
|
0.001142*pow(alpha,3));
|
||||||
}
|
}
|
||||||
KCL = -delta_CL/eta_ref_wing;
|
KCL = -delta_CL/eta_ref_wing;
|
||||||
eta_wing = 0.5*(eta_wing_left + eta_wing_right);
|
eta_wing = 0.5*(eta_wing_left + eta_wing_right);
|
||||||
delta_CL = eta_wing*KCL;
|
delta_CL = eta_wing*KCL;
|
||||||
|
|
||||||
|
|
||||||
// drag fit
|
// drag fit
|
||||||
delta_CD = (-0.0089 + 0.001578*alpha - 0.00046253*pow(alpha,2) +
|
delta_CD = (-0.0089 + 0.001578*alpha - 0.00046253*pow(alpha,2) +
|
||||||
-4.7511e-5*pow(alpha,3) + 2.3384e-6*pow(alpha,4));
|
-4.7511e-5*pow(alpha,3) + 2.3384e-6*pow(alpha,4));
|
||||||
KCD = -delta_CD/eta_ref_wing;
|
KCD = -delta_CD/eta_ref_wing;
|
||||||
delta_CD = eta_wing*KCD;
|
delta_CD = eta_wing*KCD;
|
||||||
|
|
||||||
// pitching moment fit
|
// pitching moment fit
|
||||||
delta_Cm_a = (-0.01892 - 0.0056476*alpha + 1.0205e-5*pow(alpha,2)
|
delta_Cm_a = (-0.01892 - 0.0056476*alpha + 1.0205e-5*pow(alpha,2)
|
||||||
- 4.0692e-5*pow(alpha,3) + 1.7594e-6*pow(alpha,4));
|
- 4.0692e-5*pow(alpha,3) + 1.7594e-6*pow(alpha,4));
|
||||||
|
|
||||||
delta_Cm_de = (-0.014928 - 0.0037783*alpha + 0.00039086*pow(de,2)
|
delta_Cm_de = (-0.014928 - 0.0037783*alpha + 0.00039086*pow(de,2)
|
||||||
- 1.1304e-5*pow(de,3) - 1.8439e-6*pow(de,4));
|
- 1.1304e-5*pow(de,3) - 1.8439e-6*pow(de,4));
|
||||||
|
|
||||||
delta_Cm = delta_Cm_a + delta_Cm_de;
|
delta_Cm = delta_Cm_a + delta_Cm_de;
|
||||||
KCm_alpha = delta_Cm_a/eta_ref_wing;
|
KCm_alpha = delta_Cm_a/eta_ref_wing;
|
||||||
KCm_de = delta_Cm_de/eta_ref_tail;
|
KCm_de = delta_Cm_de/eta_ref_tail;
|
||||||
delta_Cm = (0.75*eta_wing + 0.25*eta_tail)*KCm_alpha + (eta_tail)*KCm_de;
|
delta_Cm = (0.75*eta_wing + 0.25*eta_tail)*KCm_alpha + (eta_tail)*KCm_de;
|
||||||
|
|
||||||
// hinge moment
|
// hinge moment
|
||||||
if (alpha < 13)
|
if (alpha < 13)
|
||||||
{
|
{
|
||||||
delta_Ch_a = (-0.0012862 - 0.00022705*alpha + 1.5911e-5*pow(alpha,2)
|
delta_Ch_a = (-0.0012862 - 0.00022705*alpha + 1.5911e-5*pow(alpha,2)
|
||||||
+ 5.4536e-7*pow(alpha,3));
|
+ 5.4536e-7*pow(alpha,3));
|
||||||
}
|
}
|
||||||
else
|
else
|
||||||
{
|
{
|
||||||
delta_Ch_a = 0;
|
delta_Ch_a = 0;
|
||||||
}
|
}
|
||||||
delta_Ch_e = -0.0011851 - 0.00049924*de;
|
delta_Ch_e = -0.0011851 - 0.00049924*de;
|
||||||
delta_Ch = -(delta_Ch_a + delta_Ch_e);
|
delta_Ch = -(delta_Ch_a + delta_Ch_e);
|
||||||
KCh = -delta_Ch/eta_ref_tail;
|
KCh = -delta_Ch/eta_ref_tail;
|
||||||
delta_Ch = eta_tail*KCh;
|
delta_Ch = eta_tail*KCh;
|
||||||
|
|
||||||
// rolling moment
|
// rolling moment
|
||||||
CL_diff = (eta_wing_left - eta_wing_right)*KCL;
|
CL_diff = (eta_wing_left - eta_wing_right)*KCL;
|
||||||
delta_Cl = CL_diff/4;
|
delta_Cl = CL_diff/4;
|
||||||
|
|
||||||
}
|
}
|
||||||
|
|
||||||
void add_ice_effects()
|
void add_ice_effects()
|
||||||
{
|
{
|
||||||
CL_clean = -1*CZ*cos(Alpha) + CX*sin(Alpha); //Check later
|
CL_clean = -1*CZ*cos(Alpha) + CX*sin(Alpha); //Check later
|
||||||
CD_clean = -1*CZ*sin(Alpha) - CX*cos(Alpha);
|
CD_clean = -1*CZ*sin(Alpha) - CX*cos(Alpha);
|
||||||
Cm_clean = Cm;
|
Cm_clean = Cm;
|
||||||
Cl_clean = Cl;
|
Cl_clean = Cl;
|
||||||
Ch_clean = Ch;
|
Ch_clean = Ch;
|
||||||
|
|
||||||
CL_iced = CL_clean + delta_CL;
|
CL_iced = CL_clean + delta_CL;
|
||||||
CD_iced = CD_clean + delta_CD;
|
CD_iced = CD_clean + delta_CD;
|
||||||
Cm_iced = Cm_clean + delta_Cm;
|
Cm_iced = Cm_clean + delta_Cm;
|
||||||
Cl_iced = Cl_clean + delta_Cl;
|
Cl_iced = Cl_clean + delta_Cl;
|
||||||
//Ch_iced = Ch_clean + delta_Ch;
|
//Ch_iced = Ch_clean + delta_Ch;
|
||||||
|
|
||||||
CL = CL_iced;
|
CL = CL_iced;
|
||||||
CD = CD_iced;
|
CD = CD_iced;
|
||||||
Cm = Cm_iced;
|
Cm = Cm_iced;
|
||||||
Cl = Cl_iced;
|
Cl = Cl_iced;
|
||||||
//Ch = Ch_iced;
|
//Ch = Ch_iced;
|
||||||
|
|
||||||
CZ = -1*CL*cos(Alpha) - CD*sin(Alpha);
|
CZ = -1*CL*cos(Alpha) - CD*sin(Alpha);
|
||||||
CX = CL*sin(Alpha) - CD*cos(Alpha);
|
CX = CL*sin(Alpha) - CD*cos(Alpha);
|
||||||
|
|
||||||
}
|
}
|
||||||
|
|
|
||||||
Loading…
Reference in a new issue