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- /*
- * Compute how long to fire horizontal thrusters so that the total fuel
- * consumed is minimized. The minimum value of the function is the total
- * amount of fuel that will be used. The 'time' parameter is the length
- * of time that the horizontal thruster should be fired (in seconds).
- */
- Title "Compute fire time for thruster to minimize total fuel consumption";
- Constant G=1.67; // Gravitational acceleration on moon (meters/sec^2)
- Constant A=1.10; // Acceleration from horizontal thruster (meters/sec^2)
- Constant burnrate=2.3; // Kg/sec fuel burn rate to produce 1 G acceleration
- Constant dist=200; // Horizontal distance to be moved (meters)
- Parameter time; // Number of seconds to fire horizontal thruster
- Double hfuel; // Fuel burned by horizontal thrusters
- Double vfuel; // Fuel burned by vertical thrusters
- /*
- * Compute fuel burned by vertical thruster.
- */
- vfuel = time * G * burnrate;
- /*
- * Compute fuel consumed by horizontal thrusters (start and stop).
- */
- hfuel = 2 * time * A * burnrate;
-
- Function burnrate*(2*time*A/G + 2*time + (dist - A*time^2)/(A*time));
- Data;
-