more analysis

Matlab_post_analysis/final_sequence.m

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+close all; clear all;
+%% Final Static Fire Sequence
+
+% Time vector
+dt = 0.0001;              % or 0.01, etc.
+t  = -8:dt:14;           % colon, not linspace
+
+
+%% Define sequence for each valve
+% [ start_time, target_value, ramp_duration ]
+
+N2_events = [
+    -3   100   0
+];
+
+
+Fuel_events = [
+    1.5    25   0.5
+    3.5   100   1.5
+    8       0   0.5
+];
+
+LOX_events = [
+    1.8    25   0.2
+    3.5    100  1.5
+    8       0   0.3
+];
+
+Pyro_events = [
+     0   100   0.01
+     1.8     0   0.01
+];
+
+%% Generate profiles (initial value = 0)
+N2   = valve_profile(t, N2_events,   0);
+Fuel = valve_profile(t, Fuel_events, 0);
+LOX  = valve_profile(t, LOX_events,  0);
+Pyro = valve_profile(t, Pyro_events, 0);
+
+%% Plot
+% Existing
+figure; hold on; grid on; box on;
+plot(t, N2,   '--', 'LineWidth', 1,  'Color', [0 0 1 0.5]);
+plot(t, Fuel, '-',  'LineWidth', 1.5);
+plot(t, LOX,  '-',  'LineWidth', 1.5);
+%plot(t, Pyro, '--', 'LineWidth', 1);
+plot([0,0],[0,100],'-', 'LineWidth', 2,'Color', [1 0 0 0.5]); %Ignition
+
+
+ax = gca;
+ax.XTick = -4:1:10;
+ax.XMinorTick = 'on';
+ax.XAxis.MinorTickValues = -4:0.1:10;
+ax.XMinorGrid = 'on';
+ax.MinorGridAlpha = 0.15;                % transparency
+ax.MinorGridLineStyle = '-';            % solid but faint
+ax.MinorGridColor = [0.8 0.8 0.8];
+
+xlabel('Time [s]');
+ylabel('Opening[%]');
+legend('Nitrogen','Ethanol','LOX','Ignition','Location','best');
+ylim([-5 105]);
+xlim([-4 10]);
+title('Final Ignition Sequence');
+
+
+
+
+
+%% Helper function
+function u = valve_profile(t, events, initial_value)
+    % events: [t_start, target_value, ramp_duration]
+    % assumes events are sorted by t_start
+
+    u = initial_value * ones(size(t));
+    prev_value = initial_value;
+
+    for k = 1:size(events,1)
+        t0     = events(k,1);
+        target = events(k,2);
+        dur    = events(k,3);
+
+        if dur <= 0
+            % Instant step
+            u(t >= t0) = target;
+        else
+            % Linear ramp from prev_value to target
+            t1        = t0 + dur;
+            idx_ramp  = (t >= t0) & (t <= t1);
+            u(idx_ramp) = prev_value + ...
+                (target - prev_value) .* (t(idx_ramp) - t0) / dur;
+
+            % Hold new value after ramp
+            u(t > t1) = target;
+        end
+
+        prev_value = target;
+    end
+end