Question #707635 on Yade changed:
https://answers.launchpad.net/yade/+question/707635
Yade Guide posted a new comment:
Hey kyle2000, check out some related threads. This is an automated
reply.
Title: "A problem with using the ServoPIDController() function"
Question by wangkaichao on 08 Apr 2023:
The user is encountering difficulties with using the ServoPIDController()
function in Yade on Ubuntu 22.04. They are seeking assistance in setting the
target value to a sine function of time within their code. The user has
provided information about the function's usage and suggested solutions,
including using labels and PyRunner for more advanced options.
https://answers.launchpad.net/yade/+question/706118
Title: "Servo control of flexible membrane using ServoPIDController"
Question by kyle2000 on 13 Jul 2023:
The user is seeking help with using a ServoPIDController for servo control of
a flexible membrane with confining pressure. They have been advised to assign
corresponding center-oriented forces to the grid nodes and start with a simpler
approach by prescribing force directly to the nodes using O.forces.setPermF. If
insisting on servo control, the user can use ServoPIDController for each grid
node, calculating the confining stress area and targeting a specific force
value. The user asked if the 'axis' in PIDController should be defined
individually for each node, to which the response was yes, with a few
considerations. They are also looking into the correctness of the function for
calculating the stress on the loading plate and confining stress. The
difficulty lies in determining proper proportional parameters for kP, kI, and
kD. A user suggested reading the wikipedia article and testing the parameters
on a simple example. Another user confirmed that the function for calculating
the
stress on the loading plate and confining stress looks correct.
https://answers.launchpad.net/yade/+question/707278
Title: "About servo process of triaxialStressController engine"
Question by littlefish on 14 Mar 2019:
The user is having difficulty controlling servo processes in a
triaxialStressController engine for a triaxial test with wall boundaries. They
experience large fluctuations in confining pressure when axial strain exceeds
20-30%. The user wonders if there's a way to control the confining pressure
within a smaller range during the test.In response to this
issue, Bruno suggests that large fluctuations can have various causes and
recommends providing more information for a more accurate answer. He mentions
that when the tolerance is zero, servo-control will do its best unless the
difference is exactly zero.
https://answers.launchpad.net/yade/+question/679193
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