blockTrapezoid

Extends from ModelicaDEVS.Templates.DSource (DEVS source block).

Information

The Trapezoid Block

Parameters:

offset	signal ground value
a	amplitude
tr	rise time (how long does it take to reach the upper value)
tf	fall time (how long does it take to reach the lower value)
tu	time up (how long does the signal stay on the upper value)
td	time down (how long does the signal stay on the lower value)
k	number of outputs during the rise of the slopes (only for QSS1)

Description:

This block generates a trapezoidal signal.

Again, QSS1 needs the signal to be described in terms of a piecewise constant stair function (see the description of the Ramp block for more details).

Note that it is possible to assign a negative value to the amplitude, such that the trapezoidal signal is mirrored at the straight line y=offset.


Generated Events (QSS1 mode):


Note: the following table descibes only one period of the signal.

	yVal[1]	yVal[2]	yVal[3]
t=i*tr/k	i*a/k	0	0
t=(tr+tu)+i*tf/k	i*a/k	0	0
i={0,1,2,...,k}

Parameter setting:

offset=0 a=1 tr=2 tf=0.5 tu=0.5 td=1 k=10

Generated Events (QSS2/QSS3 mode):

	yVal[1]	yVal[2]	yVal[3]
t=i*(tr+tu+tf+td)	offset	a/tr	0
t=tr+i*(tr+tu+tf+td)	a	0	0
t=tr+tu+i*(tr+tu+tf+td)	a	-a/tf	0
t=tr+tu+tf+i*(tr+tu+tf+td)	offset	0	0
i=natural numbers

Parameter setting:

offset=0 a=1 tr=2 tf=0.5 tu=0.5 td=1