Dymola_InlineAfterIndexReduction

Dymola_InlineAfterIndexReduction

This question is related to an issue that I encountered when I was playing
with some blocks. Here's the model that I have,
As you can see, there are two kinds of connections, the inputs of the
first connection(from the top to bottom) is u[1],u[2],u[3], other blocks
are quite self-explanatory (all default values, except that startTime = 5
for the step input block).
From my knowledge, the first kind of connection only outputs angular
velocity but not angle and angle acceleration(they are both zero), which
is a bit not realistic(I'll explain why I did this). The second connection
outputs an angular velocity as well.
My problem was that, in the Second connection, the clutch seems working
all right(after 5 seconds the clutch is engaged(relative angle phi_rel =
0))
However, the first connection behaves quite differently. We can see that
they are all flange connections, and angular velocities are all calculated
from flange_a/b.phi, so we should expect that there is no angular velocity
difference in the clutch no matter what the input (realExperssion1) is.
But the interesting thing is that when I simulate the model, the left
flange of the clutch is not moving, the right flange is rotating instead.
Here're two plots of my results.
Connection1
Connection2
Actually, I should expect to see the flange_a.phi and flange_b.phi are all
zero, and then I accidentally removed the annotation
__Dymola_InlineAfterIndexReduction = true in the move block, then the
model behaves as what I expected. I wound be really appreciated if anyone
could help me explain what I saw. Thanks A LOT!