How to get Eigen-frequencies list from a Modal Analysis?

Ayush Kumar
Ayush Kumar Member, Moderator, Employee Posts: 470
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edited June 2023 in Structures

How to get Eigen-frequencies list from a Modal Analysis?

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  • Ayush Kumar
    Ayush Kumar Member, Moderator, Employee Posts: 470
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    Answer ✓

    For undamped Modal Analysis:

    analysis = ExtAPI.DataModel.Project.Model.Analyses[0]
reader = analysis.GetResultsData()
reader.ListTimeFreq
  • Ayush Kumar
    Ayush Kumar Member, Moderator, Employee Posts: 470
    100 Answers 250 Likes 100 Comments Second Anniversary
    ✭✭✭✭
    Answer ✓

    For damped modal analysis the eigenvalues are complex numbers, the returned list needs to be filtered:

    modal_analysis = ExtAPI.DataModel.Project.Model.Analyses[0]  # Modal Analysis
reader = modal_analysis.GetResultsData()
eigen_freqs = list(filter(lambda x: x > 0, list(reader.ListTimeFreq)[1::2]))

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