Difference in .pch and .h3d file Plot

Lukas Kneer_21880
Lukas Kneer_21880 Altair Community Member
edited February 2021 in Community Q&A

My Problem is, that a Plot from the .pch-file data is different than the Plot in HyperGraph from the same solve. The Data come from a Frequency Response Analysis with an acceleration output in a frequency range from 0-500Hz. The Problem is that the max. values of the Punch file are different to the values of the .h3d file, as shown below. Any idea why?

imageThe HyperGraph Plot has a peak at 105 Hz with an acceleration of about 3.8g

image

The Plot from the .pch file (Plot with MATLAB) has a drop at the Point where the peak should be (only 0.459g at 105 Hz). As you can see, this problem has every curve.

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Answers

  • Adriano Koga_20259
    Adriano Koga_20259 New Altair Community Member
    edited February 2021

    have you test plotting the same punch file into HyperGraph, too? Just for double check.

     

    I don't know how MatLab plots pch files. Is there a reader for it? It looks like it is missing the peaks.

     

    You should try Compose too, as it has the same syntax, and it supports direct reading of CAE data, just like yours (both H3D and PCH).

  • Lukas Kneer_21880
    Lukas Kneer_21880 Altair Community Member
    edited February 2021
    Adriano Koga_20259 said:

    have you test plotting the same punch file into HyperGraph, too? Just for double check.

     

    I don't know how MatLab plots pch files. Is there a reader for it? It looks like it is missing the peaks.

     

    You should try Compose too, as it has the same syntax, and it supports direct reading of CAE data, just like yours (both H3D and PCH).

    My HyperGraph does not accept .pch files.

    image

    I have checked the .pch files with a texteditor. The Peak values are missing there, so it's not a problem of my MATLAB-Program i wrote.

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