Learning Forum

[t.tsiris]

Hello,

I have a cyclic symmetric sector where the total number of sectors is 11, which means that the harmonic indices are 0,1,2,3,4,5. I simulate the model to get the first 6 modes for every harmonic index. After that, I want to extract the mode shapes of every mode and harmonic index into a .txt file. I have found a way to do that, through APDL commands into Workbench, by inserting a variable that defines the number of modes that I want to extract. However, I cannot find a way to get the mode shapes of a harmonic index different to 0, since the software recognises that only 6 modes exist. These 6 modes are the first 6 modes with harmonic index=0. I haven't found a command that somehow considers also the harmonic index, so I can extract every possible mode shape.

Is it feasible to get all the mode shapes for every inded though APDL commands or do I need to implement another way?

Thank you in advance.

[Akshay Singh]

 

hi,
Do you want to extract the following table into a text/csv file?

If that is the case, you can shift select the full table, Right Click > Export>save as text file

 

[t.tsiris]

Hi Akshay,

Thank you for your answer. I know that I can do that. However, I am interested in getting the mode shapes of every mode for every harmonic index, and not just the natural frequencies.

[Akshay Singh]

Mode shapes can be extracted as images or animations based on your requirement.

[Akshay Singh]

 

examples:
https://ansyshelp.ansys.com/public/account/secured?returnurl=/Views/Secured/corp/v251/en/act_script/act_script_examples_export_result_animations.html

https://ansyshelp.ansys.com/public/account/secured?returnurl=/Views/Secured/corp/v251/en/act_script/act_script_examples_export_result_images.html?q=ExportImage()

 

[Dennis Chen]

 

Hello, t.tsiris, you can do this through a python script.   I’ve written this as part of a project in the past.   below is an example script.   It just shows the idea, you will want to adjust based on your problems. 

 

model = ExtAPI.DataModel.Project.Model

mesh = model.Mesh

materials = model.Materials

analysis = model.Analyses[1]

solution = analysis.Solution

 

# with Transaction():

for i in range(1,5):  # first 4 modes

    sol = solution.AddEquivalentStress()

    sol2 = solution.AddTotalDeformation()

    sol.CyclicMode = 1

    sol.HarmonicIndex = i

    sol2.CyclicMode = 1

    sol2.HarmonicIndex = i

    sol.Name = “Mode_” + str(i) + “_Stress”

    sol2.Name = “Mode_” + str(i) + “_Deformation”

   

mode_start = 1

mode_end = 80

end_index = mode_end

harmonic_index_1 = 9

 

for j in range(mode_start, end_index, 2):  # EO 36

    sol = solution.AddEquivalentStress()

    sol2 = solution.AddTotalDeformation()

    sol.CyclicMode = j

    sol.HarmonicIndex = harmonic_index_1

    sol2.CyclicMode = j

    sol2.HarmonicIndex = harmonic_index_1

    sol.Name = “Mode_” + str(j+4) + “_Stress”

    sol2.Name = “Mode_” + str(j+4) + “_Deformation”

 

with Transaction():

    solution.EvaluateAllResults()

 

    result_stress = DataModel.GetObjectsByType(DataModelObjectCategory.StressResult)

    result_deform = DataModel.GetObjectsByType(DataModelObjectCategory.DeformationResult)

    num_stress = 1

    for result in result_stress:

        result.Activate()

        result.Name = “mode” + str(num_stress) + “_stress”

        Graphics.ExportImage(“path” + result.Name + “.png”)

        # result.ExportToTextFile(“path” + result.Name + “.txt”)

        num_stress += 1

 

    num_deform = 1

    for result in result_deform:

        result.Activate()

        result.Name = “mode” + str(num_deform) + “_deformation”

        Graphics.ExportImage(“path” + result.Name + “.png”)

        # result.ExportToTextFile(“path” + result.Name + “.txt”)

        num_deform += 1

 

[t.tsiris]

Hi Dennis,

Thanks a lot for your answer. It really helped me a lot!