I have two questions, one for HyperGraph and one for Radioss

Khang Tran

Question 1: I have a graph of accelerometer. I would like to filter this data by "filter SAE 300", but I don't know how to do that. Can you please show me the way how to filter this data in Hypergraph ? 

 

Question 2: In the Time History option in Radioss, I would like to more detail about the TH FILE, because I see there are many type: ATH, BTH, CTH, .... ITH. So what's the meaning of ATH, BTH, CTH, ..... and when to use it ? Thank you

 

PaulAltair

Firstly, If you set FCUT on your /ACCEL card to 495, then the output will be filtered in Radioss Solver to SAE300 (no need to filter in post)

If you want to filter raw acceleration in post instead, you can load preference file 'Vehicle Safety Tools' then you will get a filters dropdown option, you can select SAE General, and set 'class' to 300

 

For the /TH /ATH, /BTH, /CTH etc, there is no principal difference between those options really, except that it enables you to separate different /TH requests into separate files, and if you wish, choose different output frequencies for those different time histories: e.g. if you put displacement in /TH and set '/TFILE' frequency option in engine to 1e-3s, you will get T01 with displacement written every 1e-3, you could put your /ACCEL request in /ATH/ACCEL and have '/ATFILE' frequency at 1e-4s, and you would get an T01a with accelerations written every 1e-4s

Prasad Reddi_20512

Hi Khang,

For first question, please follow these instructions.

Step1: Click on File -> Load -> Preference File

Step2: Select Vehicle Safety Tools -> Load

After Step2, you can keep the cursor on the Curve and right click and you can see Filter option where you can select available filters for your curve.

For 2nd question, the contents of /ATFILE files are defined through the option /xTH (where x= A to I). These options use the same keyword format and variables as Time Histories, except for the addition of the prefix (/ATH, /BTH...). The frequency of output for the additional time history files is defined using /xTHFILE (where x = A to I). Hence, if you are interested to get only RIGID BODY FORCES, then you can simply use TH.

Hope this helps.

Cheers,

Prasad

Venkata Chittala_22019

We support following filter classes for SAE (15, 60,180,600,1000)

Khang Tran

Prasad Reddi_20512 said:

Hi Khang,

For first question, please follow these instructions.

Step1: Click on File -> Load -> Preference File

Step2: Select Vehicle Safety Tools -> Load

After Step2, you can keep the cursor on the Curve and right click and you can see Filter option where you can select available filters for your curve.

For 2nd question, the contents of /ATFILE files are defined through the option /xTH (where x= A to I). These options use the same keyword format and variables as Time Histories, except for the addition of the prefix (/ATH, /BTH...). The frequency of output for the additional time history files is defined using /xTHFILE (where x = A to I). Hence, if you are interested to get only RIGID BODY FORCES, then you can simply use TH.

Hope this helps.

Cheers,

Prasad

Thank you very much,

That's what I am looking for.

 

Best regards

Khang Tran

Paul Sharp_21301 said:

Firstly, If you set FCUT on your /ACCEL card to 495, then the output will be filtered in Radioss Solver to SAE300 (no need to filter in post)

If you want to filter raw acceleration in post instead, you can load preference file 'Vehicle Safety Tools' then you will get a filters dropdown option, you can select SAE General, and set 'class' to 300

 

For the /TH /ATH, /BTH, /CTH etc, there is no principal difference between those options really, except that it enables you to separate different /TH requests into separate files, and if you wish, choose different output frequencies for those different time histories: e.g. if you put displacement in /TH and set '/TFILE' frequency option in engine to 1e-3s, you will get T01 with displacement written every 1e-3, you could put your /ACCEL request in /ATH/ACCEL and have '/ATFILE' frequency at 1e-4s, and you would get an T01a with accelerations written every 1e-4s

Thank you very much,

That's what I am looking for.

 

Best regards