TableD1 - frequency/Transient analysis

Altair Employee

Mar 22, 2016

Updated Oct 4, 2020 by Altair Forum User

For TableD1 units,

TableD1 used in transient analysis, the units are as follows:

x axis - seconds (s)

y - axis - acceleration (mm/s)

TableD1 used in frequency analysis, the units are as follows:

x - axis - Frequency (Hz)

y - axis - Magnitude (dB)

is this correct?

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New Altair Community Member

Updated Mar 22, 2016 by Rahul Rajan_21763

In TABLED1 card for FRF analysis X defines frequencies and Y defines the excitation.

Provide consistent units.Hm optistruct is unitless.

See below post for reference.

Regards

Rahul R

Altair Employee

Mar 23, 2016

Updated Mar 23, 2016 by Altair Forum User

Does SPCD also define excitation?

Altair Employee

Mar 23, 2016

Updated Mar 23, 2016 by Altair Forum User

does SPCD (if used for acceleration) define excitation as well?

Altair Employee

Mar 28, 2016

Updated Mar 28, 2016 by Altair Forum User

does SPCD (if used for acceleration) define excitation as well?

Yes,

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