surface graph plotting issue

Yun_20312
Yun_20312 Altair Community Member
edited June 9 in Community Q&A

I have RCS data of model that I had, and I tried to visualize RCS of the data that I had.

the RCS data was calcurated in multiple phi and theta, so it is 3 - dimensional data.

To visualize it, I tried to use Surface graph plotting method in altair feko, but the result is not correct.

as I attached the image, this one has too many 0.0 or values around -5.0.

but the real data doesn't have that much values.

What is the problem? is it due to feko software's internal visualization problem?

 

 

image

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Answers

  • Zeina
    Zeina
    Altair Employee
    edited June 5

    Hi Yun,

    Can you share the data file so that I can test?

    Thanks,

    Zeina

  • Yun_20312
    Yun_20312 Altair Community Member
    edited June 5
    Zeina said:

    Hi Yun,

    Can you share the data file so that I can test?

    Thanks,

    Zeina

    I attach my postfeko pfs file. if you need original cfx file, let me know and I will attach it

  • Zeina
    Zeina
    Altair Employee
    edited June 5
    Yun_20312 said:

    I attach my postfeko pfs file. if you need original cfx file, let me know and I will attach it

    Thank you for sharing the .pfs.

    I will need the .ffe along with the .pfs session. Without it the main data is missing.

     

  • Yun_20312
    Yun_20312 Altair Community Member
    edited June 5
    Zeina said:

    Thank you for sharing the .pfs.

    I will need the .ffe along with the .pfs session. Without it the main data is missing.

     

    I tried to upload ffe mile but the system says it is unsupported file format. are there any way to upload data?

  • Zeina
    Zeina
    Altair Employee
    edited June 5
    Yun_20312 said:

    I tried to upload ffe mile but the system says it is unsupported file format. are there any way to upload data?

    You can zip it then upload the zipped archive.

  • Yun_20312
    Yun_20312 Altair Community Member
    edited June 5
    Zeina said:

    Hi Yun,

    Can you share the data file so that I can test?

    Thanks,

    Zeina

    here is the zip file containing ffe file

  • Zeina
    Zeina
    Altair Employee
    edited June 5
    Yun_20312 said:

    here is the zip file containing ffe file

    Hi Yun,

    I don't see any issue with the plots. Here are some points I have randomly picked from a surface plot of the data. You'll see that all three values were correctly plotted.
    image

    Note that the RCS values in the .ffe file are in m^2 and not in dBsm.

    If you have specific points where you have observed discrepancies between the data and the plot. Please share their info.

  • Yun_20312
    Yun_20312 Altair Community Member
    edited June 6
    Zeina said:

    Hi Yun,

    I don't see any issue with the plots. Here are some points I have randomly picked from a surface plot of the data. You'll see that all three values were correctly plotted.
    image

    Note that the RCS values in the .ffe file are in m^2 and not in dBsm.

    If you have specific points where you have observed discrepancies between the data and the plot. Please share their info.

    I cheked the .dat file I exported with m^2 surface graph, and confirmed there is no issue in RCS value in .dat file. RCS values are all the same with .ffe file.

    but what I thouht wrong was surface graph of dB, not m^2.

    could you check RCS value from dB version of surface graph? if you could, export graph to .dat file and see RCS values. mine is:

    image

     

    as you see, there are pointless -4.0 values, which is totally wrong.

    image

    this one is showing results converted from m^2 to dBsm.

     

     

  • Zeina
    Zeina
    Altair Employee
    edited June 6
    Yun_20312 said:

    I cheked the .dat file I exported with m^2 surface graph, and confirmed there is no issue in RCS value in .dat file. RCS values are all the same with .ffe file.

    but what I thouht wrong was surface graph of dB, not m^2.

    could you check RCS value from dB version of surface graph? if you could, export graph to .dat file and see RCS values. mine is:

    image

     

    as you see, there are pointless -4.0 values, which is totally wrong.

    image

    this one is showing results converted from m^2 to dBsm.

     

     

    Hi Yun,

    Interestingly, I do not have the same values as you when exporting to .dat:
    image

    What version/subversion are you using?

  • Yun_20312
    Yun_20312 Altair Community Member
    edited June 8
    Zeina said:

    Hi Yun,

    Interestingly, I do not have the same values as you when exporting to .dat:
    image

    What version/subversion are you using?

    I'm using Altair FEKO 2019.3.3, which is quite old version. 

    so far I thouhgt even though I use old version there is no issue, but seems there are bug / software error when converting m^2 value to dBsm.

     

  • Zeina
    Zeina
    Altair Employee
    edited June 9
    Yun_20312 said:

    I'm using Altair FEKO 2019.3.3, which is quite old version. 

    so far I thouhgt even though I use old version there is no issue, but seems there are bug / software error when converting m^2 value to dBsm.

     

    Indeed, your version is very old. I strongly recommend you update. A lot of enhancements and feature additions have been added since.

    Best Regards,

    Zeina

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