Trapezoid
block Trapezoid "Generate trapezoidal signal of type Real"
parameter Real amplitude = 1 "Amplitude of trapezoid"
annotation (Dialog(groupImage = "modelica://Modelica/Resources/Images/Blocks/Sources/Trapezoid.png"));
parameter SIunits.Time rising(final min = 0) = 0 "Rising duration of trapezoid";
parameter SIunits.Time width(final min = 0) = 0.5 "Width duration of trapezoid";
parameter SIunits.Time falling(final min = 0) = 0 "Falling duration of trapezoid";
parameter SIunits.Time period(final min = Modelica.Constants.small, start = 1) "Time for one period";
parameter Integer nperiod = -1 "Number of periods (< 0 means infinite number of periods)";
extends Interfaces.SignalSource;
protected
parameter SIunits.Time T_rising = rising "End time of rising phase within one period";
parameter SIunits.Time T_width = T_rising + width "End time of width phase within one period";
parameter SIunits.Time T_falling = T_width + falling "End time of falling phase within one period";
SIunits.Time T_start "Start time of current period";
Integer count "Period count";
initial algorithm
count := integer((time - startTime) / period);
T_start := startTime + count * period;
equation
when pre(count) < integer((time - startTime) / period) then
count = pre(count) + 1;
T_start = time;
end when;
y = offset + (if time < startTime or nperiod == 0 or 0 < nperiod and nperiod <= count then 0 else if time < T_start + T_rising then amplitude * (time - T_start) / rising else if time < T_start + T_width then amplitude else if time < T_start + T_falling then amplitude * (T_start + T_falling - time) / falling else 0);
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Documentation(info = "<html>\n<p>\nThe Real output y is a trapezoid signal:\n</p>\n\n<p>\n<img src=\"modelica://Modelica/Resources/Images/Blocks/Sources/Trapezoid.png\"\n alt=\"Trapezoid\">\n</p>\n</html>"));
end Trapezoid;