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Plotting natural frequency

Altair Forum User

Hi there. I got a problem, i want to plot the amplitude of a simple spring-mass-system in HyperGraph.

The problem is, i don´t know which load steps or control cards i have to define.

This is an example how it should look like:

wave_amplitude_graph.png.d47941176e9f295e9bddaafccea7c86b.png

I need to know how to do that because in the next step, i have to design a

spring-damper-system to visualize the damping with HyperGraph.

I would any appreciate any help of you.

Greetings

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Altair Forum User

Hi Nigue001,

Please watch below video.

Thank you

Altair Forum User

Hi there. I got a problem, i want to plot the amplitude of a simple spring-mass-system in HyperGraph.

The problem is, i don´t know which load steps or control cards i have to define.

This is an example how it should look like:

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

I need to know how to do that because in the next step, i have to design a

spring-damper-system to visualize the damping with HyperGraph.

I would any appreciate any help of you.

Greetings

Hi,

What type of analysis is it?

If it is FRF analysis, for example, you can request Displacement and plot graphs. You should also see a .freq.mvw which has all animation and plotting information.

Altair Forum User

Thank you for your reply!

I tried to use 'normal modes' analysis but i with this, i´m on the wrong way.

I only learned the basic knowledge of HyperMesh and now for a research

i have to deepen my knowledge in damped vibrations and forced vibrations.

Should i try it with FRF analysis?

Altair Forum User

Hi @Nigue001

If your load follows a frequency Vs load curve, please use FRF. If it is time Vs load, run a transient analysis

Altair Forum User

So now i runned (with help from the tutorial OS-1315) a transient analysis and this

looks good so far. But now i got another question, is it possible to replace the

dynamic load with a mass point?

Furthermore, i got the problem that i am not able to get the

natural frequency anymore.

For better understanding maybe the files will help.

Unable to find an attachment - read this blog

Altair Forum User

I run into a similar, if not the same problem. At some point, I'm unable to get the natural frequency anymore. Why does this happen?

Altair Forum User

Hi Gerson

Please can you share your model file. Will check whats wrong.

Thank you

Altair Forum User

Hi,

I´m also new to Hypergraph and MotionView and I have two questions. I designed a simple spring-damper system with MotionView.

After starting the simulation, is there a way to display the frequency of the signal and adding an enveloping curve in HyperGraph?

Greetings