Apple-2-SW/dos33fsprogs
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ksp: update physics simulation

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This commit is contained in:
Vince Weaver 2016-05-25 00:05:01 -04:00
parent 956766ecc7
commit 13c1a4eca0
2 changed files with 112 additions and 34 deletions
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2
ksp/c/Makefile
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@ -11,7 +11,7 @@ ksp_acpx.o: ksp_acpx.c
$(CC) $(CFLAGS) -c ksp_acpx.c
ksp_launch: ksp_launch.o
$(CC) $(LFLAGS) -o ksp_launch ksp_launch.o
$(CC) $(LFLAGS) -o ksp_launch ksp_launch.o -lm
ksp_launch.o: ksp_launch.c
$(CC) $(CFLAGS) -c ksp_launch.c

144
ksp/c/ksp_launch.c
View File

@ -5,38 +5,67 @@
/* Also, high school physics (thanks Mr. Brennen) */
#define PI 3.14159265358979323846264338327
void home(void) {
static double sin_degrees(double degrees) {
return sin(degrees*PI/180);
}
static double cos_degrees(double degrees) {
return cos(degrees*PI/180);
}
static double vector_magnitude(double a,double b) {
return sqrt(a*a+b*b);
}
static void home(void) {
printf("%c[2J%c[1;1H",27,27);
}
void htabvtab(int x,int y) {
static void htabvtab(int x,int y) {
printf("%c[%d;%dH",27,y,x);
}
/* TODO: want 2d-vectors at least */
#define KERBIN_RADIUS 600000.0
int main(int argc, char **argv) {
double angle=0;
double angle=45;
double capsule_mass=1.0;
double engines=3;
double engine_isp=270.0; /* s */
double engine_mass=1.5; /* tons */
double engine_thrust=168.0; /* kN */
double engine_mass=(1.5)*engines; /* tons */
double engine_thrust=(168.0)*engines; /* kN */
double fuel_flow_rate;
double tank_mass=0.5; /* tons */
double fuel_mass=4.0; /* tons */
double tanks=6;
double tank_mass=(0.5)*tanks; /* tons */
double fuel_mass=(4.0)*tanks; /* tons */
double total_fuel=fuel_mass;
double gravity=9.8; /* m/s^2 */
double gravity=-9.8; /* m/s^2 */
double gravity_x=0.0;
double gravity_y=-9.8;
double gravity_angle=0.0;
/* Kerbin radius = 600km */
double rocket_velocity=0.0; /* m/s */
double rocket_acceleration=0.0; /* m/s^2 */
double rocket_altitude=0.0; /* m */
double rocket_velocity_x=0.0; /* m/s */
double rocket_velocity_y=0.0; /* m/s */
double rocket_acceleration_x=0.0; /* m/s^2 */
double rocket_acceleration_y=0.0; /* m/s^2 */
double rocket_x=0;
double rocket_y=KERBIN_RADIUS+1000;
double rocket_altitude=KERBIN_RADIUS; /* m */
double deltav,twr;
double total_mass,empty_mass;
@ -52,47 +81,75 @@ int main(int argc, char **argv) {
deltav=engine_isp*gravity*log(total_mass/empty_mass);
twr=engine_thrust/(total_mass*gravity);
twr=engine_thrust/(total_mass*-gravity);
fuel_flow_rate=(engine_thrust)/(engine_isp*gravity);
fuel_flow_rate=(engine_thrust)/(engine_isp*-gravity);
printf("DeltaV=%lf m/s\n",deltav);
printf("Thrust/weight=%lf\n",twr);
printf("Fuel flow rate=%lf, time=%lfs\n",
fuel_flow_rate,fuel_mass/fuel_flow_rate);
scanf("%c",&input);
while(1) {
if (fuel_mass<0.1) {
fuel_mass=0.0;
rocket_acceleration=-gravity;
rocket_velocity=rocket_velocity+rocket_acceleration*1.0;
rocket_altitude=rocket_altitude+
(rocket_velocity*1.0)+
0.5*rocket_acceleration+1.0*1.0;
if (rocket_altitude<0.0) {
printf("CRASH!\n");
break;
}
rocket_acceleration_x=0;
rocket_acceleration_y=0;
}
else {
rocket_acceleration=(engine_thrust/total_mass)-gravity;
rocket_velocity=rocket_velocity+rocket_acceleration*1.0;
rocket_altitude=rocket_altitude+
(rocket_velocity*1.0)+
0.5*rocket_acceleration+1.0*1.0;
rocket_acceleration_x=(engine_thrust/total_mass)*sin_degrees(angle);
rocket_acceleration_y=(engine_thrust/total_mass)*cos_degrees(angle);
fuel_mass=fuel_mass-fuel_flow_rate;
total_mass=engine_mass+tank_mass+fuel_mass+capsule_mass;
}
gravity_angle=atan(rocket_x/rocket_y);
gravity_y=cos(gravity_angle)*gravity;
gravity_x=sin(gravity_angle)*gravity;
rocket_acceleration_y+=gravity_y;
rocket_acceleration_x+=gravity_x;
rocket_velocity_y=rocket_velocity_y+rocket_acceleration_y*1.0;
rocket_velocity_x=rocket_velocity_x+rocket_acceleration_x*1.0;
rocket_y=rocket_y+
(rocket_velocity_y*1.0)+
0.5*rocket_acceleration_y*1.0*1.0;
rocket_x=rocket_x+
(rocket_velocity_x*1.0)+
0.5*rocket_acceleration_x*1.0*1.0;
rocket_altitude=vector_magnitude(rocket_x,rocket_y);
if (rocket_altitude<KERBIN_RADIUS) {
printf("CRASH!\n");
break;
}
/* Adjust gravity */
gravity=-9.8/(
((rocket_altitude)/KERBIN_RADIUS)*
((rocket_altitude)/KERBIN_RADIUS));
home();
htabvtab(1,21);
printf("Time: %lf\n",time);
printf("ALT: %lf m\n",rocket_altitude);
printf("VEL: %lf m/s\tStage: %d\n",rocket_velocity,stage);
printf("ACCEL: %lf g\tFuel: %lf%%\n",
rocket_acceleration/gravity,
printf("ALT: %lf m\tg=%lf\n",rocket_altitude-KERBIN_RADIUS,gravity);
printf("VEL: %lf m/s\tStage: %d\n",
vector_magnitude(rocket_velocity_x,rocket_velocity_y),
stage);
printf("ACCEL: %lf g\tFuel: %lf%%",
vector_magnitude(rocket_acceleration_x,rocket_acceleration_y)/9.8,
fuel_mass*100.0/total_fuel);
htabvtab(30,21);
@ -100,11 +157,32 @@ int main(int argc, char **argv) {
htabvtab(30,20);
if ((angle>90) && (angle<270)) printf("SCREAM");
else if (rocket_velocity>100) printf("SMILE");
else if (rocket_acceleration<0) printf("FROWN");
else if (rocket_velocity_y>100) printf("SMILE");
else if (rocket_acceleration_y<0) printf("FROWN");
else printf("NEUTRAL");
htabvtab(20,13);
printf("grav angle=%lf\n",gravity_angle*180.0/PI);
htabvtab(20,12);
printf("x=%lf y=%lf\n",rocket_x,rocket_y);
htabvtab(20,11);
printf("vx=%lf vy=%lf\n",rocket_velocity_x,
rocket_velocity_y);
htabvtab(20,10);
printf("angle=%lf\n",angle);
htabvtab(20,9);
if (angle<22.5) printf("^");
else if (angle<67.5) printf("/");
else if (angle<112.5) printf(">");
else if (angle<157.5) printf("\\");
else if (angle<205.5) printf("V");
else if (angle<250.5) printf("/");
else if (angle<295.5) printf("<");
else if (angle<340.5) printf("\\");
else printf("^");
scanf("%c",&input);