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Posts posted by Ariane Rebelato


To evaluate the response of a structure submitted to a periodic sine wave force in the time domain, can I define the OptiStruct loadstep as "transient direct"? Does "transient direct" and "transient modal" differ in computational cost only?

Hello,
When I do the FRF analysis and visualize the responses in Hypergraph they appear as magnitude and phase, how can I get these answers in rectangular coordinates (real and imaginary) directly? 

I'm using Optistruct, It would be for 2D beam.

Hello, I would like to know the equivalent element of 2D BernoulliEuler in Hypermesh?

Thanks, but in fact it would be in the HyperGraph part of my doubt. When I have a 17node model, the FRF response in HyperGraph is divided by nodes, so I have 17 answers and I have to save one by one because if I select all to export to csv file it stays one underneath the other and I would like they were in columns so I could extract the data I need more easily. And I also wish they could be saved at once but in different files, as if I were creating a code to extract each response from each node, but all at once.

For example, I'm doing a frf on a 17node model and I want to get the magnitudeandphase response separated by columns and by nodes from all nodes, how do I create a pattern to just run it without having to extract the answer node by node? For models with more elements this takes a lot of time. 
Thank you Rahul!
How to export the results in fomart of list of csv file? I didn't find this option in HyperView, only in HyperGraph, or how it would be done in HyperGraph to obtain the answers in this complex format? 
Hi,
I'm doing FRF direct with OptiStruct. When I extract the answers in HyperGraph, the magnitude and phase appear separately, how can I get this answer as a complex number?

Thanks! But I'm working with OptiStruct, Is the procedure the same?

Can I model a revolute joint with HyperMesh? If so, how to do this? Does any tutorial show this?

Hello, I would like to know how I can simulate/model a massspringdamper system in HyperMesh to do a dynamic analysis and get system responses and FRF in acceleration?

Thanks, but I don't want to get the answers in pairs, this is what happens now, I want to get the response pointtopoint. I'll look at the file.

I'm sorry, my version is 14. It's because I started using last year and downloaded the latest version that was available at the time.

I only have the 2016 version and I'm using it. Could you tell me what's going on?

Hello,
I am doing an analysis with 130,000 points in hyperworks (FRF and Transient) and when I open in Hypergrah and try to save in csv (excel) excel file does not show me point to point but up to 65,000 only, ie it is grouping a Response in pairs. How could I save the 130,000 points?

2 hours ago, Girish said:FRF response is normalized to the input.
If you are using modal frf, eigenvectors are normalized to mass by default. But that can be changed in EIGRL card.
How do I change this?

How do I change this?

I would like to know if when I do the FRF in OptiStruct the result obtained is normalized by the mass, if it has some other type of normalization or if the result is "pure"?

How to calculate the hysteretic damping and how to put it in optistruct?

What kind of mass matrix the HyperWorks (optistruct) uses (eg lumped)? And how do I access / extract this information from the program?

Hello,
I searched for a topic Compose but I didn't find, so I'm asking here.
I would like to know how to read csv files in Compose, because I tried with the same command of MatLab and it did not work.
I would also like to know if it have some function to do heaviside. 
Hello,
I would like to know how I can apply a sinusoidal force in Harmonic and Transient analysis with a equation. For example: sin(2*pi*w) and sin(2*pi*t), where w is the excitation frequency and t is time, because in Harmonic and Transient analysis I was using TABLED1 with RLOAD2 and TLOAD1.

Hello,
I submit a modal analysis study in which the frequencies of values are close to the analytical but the vibration modes seem wrong, could tell me where I am going wrong? What exactly is Eigen Mode?
springdamper model
in Altair OptiStruct
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Hello, could anyone help me to create the massspringdamper models in optistruct?