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step function issue
Posted 5 mars 2021, 18:47 UTC−5 Structural & Acoustics, Parameters, Variables, & Functions, Structural Mechanics Version 5.4 0 Replies
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Hello all,
I have a dynamic system that I simulate for 0.2 seconds. It has two angular velocities of interest, the flapping and the rotation rates. I run 4 simulations in total. They all have the same flapping and rotation rate profile with one difference: I add or subtract some number (epsilon) at t=0.01 s. I use the step function for this process and define a transition region to avoid convergence issues.
The problem is the strain difference between two cases appears at t=0.08, although the perturbation is applied at t=0.1. Interestingly, it is not the case when we perturbed the rotation rate, that is, there is an inconsistency.
Any ideas? Thanks in advance!
Summary of Simulations
sim1: nominal trajectory+step function on flapping
sim2: nominal trajectory-step function on flapping
sim3: nominal trajectory+step function on rotation
sim4: nominal trajectory-step function on rotation simulation time step=0.001 s
Step Function Parameters
Location: 0.1 sec
From: 0 To: 0.01
Size of Transition: 0.001 s
Attachments:
Hello Burak Boyacioglu
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