add speed_control_step_tc.jl

examples/speed_control_step_tc.jl

@@ -0,0 +1,67 @@
+# Example of using speed control with a step input for the set_speed using the TorqueControlledMachine
+using Pkg
+if ! ("ControlPlots" ∈ keys(Pkg.project().dependencies))
+    using TestEnv; TestEnv.activate()
+end
+using ControlPlots, WinchModels, KiteUtils
+
+set::Settings = deepcopy(load_settings("system.yaml"))
+set.sample_freq = 200.0
+set.winch_model = "TorqueControlledMachine"
+
+v_ro =     3.0 # m/s
+β =       26.0 # degrees
+K =      123.0 # N/(m/s)^2
+period =  30.0 # seconds
+
+function force(v_wind, v_ro)
+    v_eff = v_wind*cosd(β) - v_ro
+    if v_eff < 0
+        return 0
+    end
+    K * (v_eff)^2
+end
+
+function calc_force(time, v_ro)
+    v_wind = 12.1
+    force(v_wind, v_ro)
+end
+
+function calc_set_speed(time, period=10.0)
+    3.0 + 1.5 * (time%period > period/2)
+end
+
+function simulate(t_sim=60; f_0=7300, speed_0=3.176, dt=1/set.sample_freq)
+    time = 0:dt:t_sim
+    F = Float64[]
+    ACC = Float64[]
+    V_RO = Float64[]
+    V_RO_SET = Float64[]
+    f = f_0
+    v_ro = speed_0
+    if set.winch_model == "TorqueControlledMachine"
+        wm = TorqueControlledMachine(set)
+    else
+        wm = AsyncMachine(set)
+    end
+    wm.last_set_speed = v_ro
+    for t in time
+        # calculate the set_speed
+        set_speed = calc_set_speed(t)
+        V_RO_SET = push!(V_RO_SET, set_speed)
+        # calculate the acceleration
+        acc = calc_acceleration(wm, v_ro, f; set_speed, use_brake = false)
+        push!(ACC, acc)
+        # integrate the acceleration to get the velocity
+        v_ro += acc*dt
+        push!(V_RO, v_ro)
+        f = calc_force(t, v_ro)
+        push!(F, f)
+    end
+    p1=plot(time, F; xlabel="Time [s]", ylabel="Force [N]", fig="force")
+    p2=plot(time, [V_RO_SET, V_RO]; xlabel="Time [s]", ylabel="Speed [m/s]", labels=["set_speed", "speed"], fig="speed")
+    p3=plot(time, ACC; xlabel="Time [s]", ylabel="Acceleration [m/s^2]", fig="acceleration")
+    display(p1); display(p2); display(p3)
+end
+
+simulate()