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mikibierzo1973
Posts: 18
Registered: ‎04-04-2012
Accepted Solution

Harmonic Load

247 Views, 1 Replies
10-26-2012 01:16 AM

Hi!

1.-Is it possible to get the speed of the nodes in a harmonic load calculation?.
This is possible in the time histori analysis, but for the harmonic analysis this option remains off.

 

2.-How I can combine the charges if I have a Time Historty Analisys?
Example:     1: Dead weight
                   2: Weight Machine
                   3: Maintenance Charge
                   4: Dynamic loading machine (Time History Analysis)

 

Thank you for all

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pp2008
Posts: 480
Registered: ‎06-23-2008

Re: Harmonic Load

10-26-2012 02:10 AM in reply to: mikibierzo1973

1.-Is it possible to get the speed of the nodes in a harmonic load calculation?.
This is possible in the time histori analysis, but for the harmonic analysis this option remains off.

 

It is not directly output in results of harmonic analysis but amplitudes of speed in harmonic analysis can be obtained from aplitudes of displacements (displayed in for instance Displacements table) . It is resulting from the first derivative of sinusoidal function. It is enough to multiply displacements by 2*Pi*f where f is the frequency of excitation.

Analogously amplitudes of acceleration can be obtained multiplying displacements by (2*Pi*f)^2

 

2.-How I can combine the charges if I have a Time Historty Analisys?
Example:     1: Dead weight
                   2: Weight Machine
                   3: Maintenance Charge
                   4: Dynamic loading machine (Time History Analysis)

 

First converting selected time steps of time history case into simple load cases and then combining them with other cases in combinations:

tha_comb.png

 

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Regards,



Pawel Pulak
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