Timed takeoff

rocket_twin/systems/control/controller.mo

@@ -2,11 +2,11 @@ model controller
   input Real ti;
   input Real weight;
   parameter Real weight_max;
-  parameter Real t0;
+  parameter Real tl;
   output Real w;
   output Boolean engine_on;
 equation
-  if (ti < t0) then
+  if (ti < tl) then
     engine_on = false;
   else
     engine_on = true;

rocket_twin/systems/control/controller_fmu.py

@@ -30,14 +30,15 @@ class ControllerFMU(System):
     def setup(self, model_path, model_name):
 
         self.add_inward("time_var", 0.0, desc="System time", unit="")
-        self.add_inward("t0", 0.0, desc="Launch time", unit="")
+        self.add_inward("time_int", 0.0, desc="Interval between fueling end and launch", unit="")
+        self.add_inward("time_lnc", 100000.0, desc="Launch time", unit="")
         self.add_transient("x", der="1")
 
         pulling = {
             "w": "w",
             "weight": "weight_p",
             "weight_max": "weight_max",
-            "t0": "t0",
+            "tl": "time_lnc",
             "ti": "time_var",
         }
 
@@ -47,10 +48,18 @@ def setup(self, model_path, model_name):
             pulling=pulling,
         )
 
+        self.add_event("full_tank", trigger="weight_p > 0.9999*weight_max")
+
     def compute(self):
 
         self.time_var = self.time
 
+    def transition(self):
+
+        if self.full_tank.present:
+
+            self.time_lnc = self.time_var + self.time_int
+
     def create_fmu(self, model_path, model_name):
         """Create an fmu file in the control folder from an mo file.
 

rocket_twin/systems/control/rocket_controller.mo

@@ -2,11 +2,11 @@ model rocket_controller
   input Real ti;
   input Real weight;
   parameter Real weight_max;
-  parameter Real t0;
+  parameter Real tl;
   output Real w;
   output Boolean engine_on;
 equation
-  if (ti < t0) then
+  if (ti < tl) then
     engine_on = false;
   else
     engine_on = true;

rocket_twin/systems/rocket/rocket.py

@@ -43,7 +43,7 @@ def setup(self):
             "flying", False, desc="Whether the rocket is flying or not", unit=""
         )
 
-        self.add_event("Takeoff", trigger="dyn.a > 0")
+        self.add_event("Takeoff", trigger="engine.force > 0")
 
     def compute(self):
         self.a *= self.flying

rocket_twin/tests/test_controller_fmu.py

@@ -30,19 +30,20 @@ def test_controller_fmu(self):
             sys.rocket.controller.inwards, sys.rocket.tank.inwards, ["weight_max", "weight_p"]
         )
 
-        driver = sys.add_driver(RungeKutta(order=4, time_interval=[0, 16], dt=0.01))
+        driver = sys.add_driver(RungeKutta(order=4, time_interval=[0, 18], dt=0.01))
         init = {"g_tank.weight_p": 10.0, "rocket.tank.weight_p": 0.0}
         values = {
             "g_tank.w_out_max": 1.0,
             "rocket.tank.w_out_max": 0.5,
-            "controller.t0": 5.99,
-            "rocket.controller.t0": 5.99,
+            "controller.time_int": 3.0,
+            "rocket.controller.time_int": 3.0,
         }
         driver.set_scenario(init=init, values=values)
-        driver.add_recorder(DataFrameRecorder(includes=["rocket.controller.weight_p"]), period=1.0)
+        driver.add_recorder(DataFrameRecorder(includes=["rocket.a", "rocket.dyn.a"]), period=1.0)
 
         sys.run_drivers()
         data = driver.recorder.export_data()
+        data = data.drop(["Section", "Status", "Error code"], axis=1)
         print(data)
 
         np.testing.assert_allclose(sys.rocket.a, 40.0, atol=10 ** (0))