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Questions - openmdao

OpenMDAO Dymos: How to run kinematic optimization with initial and final state values that depend on design variables?

The image above shows the kinematic optimization problem statement that I'm trying to implement. The initial and final state values are directly proportional to design variables. And the following ar...
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Jonathan Ryu

python-3.x

optimization

openmdao

kinematics

Votes: 0

Answers: 1

Latest Answer

I believe this solves the problem without the need for integration, only relying on the geometric constraints of the system. Setting the constants d, b, and L0 to the appropriate values should let yo...
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Rob Falck

Can you provide recommendations on how to debug "Positive directional derivative for linesearch"?

I've been trying to get a dynamic optimization working using dymos, but my optimizations routinely fail with the following error: "Positive directional derivative for linesearch". From what ...
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Chris

openmdao

Votes: 0

Answers: 1

Latest Answer

check_partials() are good with relative error order <=10^-6 Sometimes you can have good looking partials around your initial contidition, but they are incorrect when you move away to another poin...
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Justin Gray

Getting an error when trying to record in OpenMDAO

I am trying to set up, run and record a model. The first section of the code works flawlessly, hence I provided the generalized lines of code for the subsystems, connections, design variables, constra...
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PhilE

python

openmdao

Votes: 0

Answers: 0

Functions scaling in OpenMDAO

Is there any way to apply a logarithmic scaling to the design objectives/constraints in OpenMDAO? In my optimization problem, I have to deal with an objective function that takes large values and vari...
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Kasia

optimization

openmdao

Votes: 0

Answers: 2

Latest Answer

Currently openmdao drivers don't support nonlinear scaling, and doing so through a component is the correct approach. In the past I've sometimes made a separate "objective" component that e...
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Rob Falck

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