Altair RISE

A program to recognize and reward our most engaged community members

Nominate Yourself Now!

Tutorial: Sine Sweep Fatigue Analysis

Hi guys,

i have a question regarding the 'Sine Sweep Fatigue Analysis' tutorial (spring link example). The guidance tells me to check the SWEEP-Flag in FATPARM Card without any further options.

image.png.1b640a5057090653e959a155f4ab6211.png

This causes an error (ERROR # 1000: incorrect data in field # 4), probably because this line indicates options for Sweep Fatigue but there is no option following.

Do i have to delete the whole '+ SWEEP'-option in FATPARM or is there something missing in my deck, that is not mentioned in the guidance?

Thanks,

Philipp

Unable to find an attachment - read this blog

Find more posts tagged with

English

OptiStruct

Accepted answers

All comments

Adriano_Koga

you should better take a look at the fatparm documentation.

Error #1000 is complaning that field #4 is missing. It is one of these fields below. (4th field of the line).

<?xml version="1.0" encoding="UTF-8"?>

PhilippB

Thank you for the answer. I didn't explained the error message very well, I'm sorry for that. The Problem is the 'SWEEP'-continuation of the FATPARM (see the picture below). The error occours because of the 0.0 in field # 4.

image.png.c412679c54170a3511aeccbe7577d324.png

To explain my Problem a bit more in detail:

OptiStruct want's me to set some kind of frequency value for the sine fatigue calculation in field #4. The Problem is, that there is no value given in the tutorial () for the SWEEP-continuation in the FATPARM. It just tells me to check the SWEEP-Option and do nothing else here.

The 'NFREQ' and the frequency value of 0.0 must be set by Optistruct by default, because in my .fem-file I just have 'checked' the SWEEP-continuation of FATPARM by typing '+ SWEEP'. Now I wondered if i can leave the continuation here because no information is given or if there is some information missing in the tutorial.

Unable to find an attachment - read this blog

Adriano_Koga

i see.

it really don't give you the frequency.

I would use the same frequency range as the TABLED1 card (0 to 1000Hz).

As you want to sweep though the same frequency range, makes sense.