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Incremental Frequency UDF

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Old   May 12, 2008, 22:43
Default Incremental Frequency UDF
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I am modelling a forced vibration cylinder with the cylinder prescribed a motion up and down following a sine function with certain amplitude and frequency.

Does anyone know how can I change the UDF so that I get an increment in frequency that I prescribe? Meaning I can start with 20s to 25s and 30s with time during simulation.

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