Difference composite model from contact surface(freeze) model

Altair Forum User
Altair Forum User
Altair Employee
edited October 2020 in Community Q&A

Hi. I want to be compare the composite analysis and contact surface (freeze)

example.png.ee563d458ca1fb3c960d3ef82957f329.png

the example is above picture. And I want to check the ERP between 0~3000Hz. and I can get the follow this. (damping material density is 1856.07kg/m^3)

 

<?xml version="1.0" encoding="UTF-8"?>composite_vs_contact(linear).thumb.png.e85a2e03377a896af92a1ebd10a939c0.png

 

<?xml version="1.0" encoding="UTF-8"?>composite_vs_contact(log).thumb.png.7c46b7baaa0ace356d12fa66e6e2f551.png

 

The blue line is contact surface(freeze) model, The black line is composite model.

 

why the blue line is more big value than black line abouy twice.

why the blue line is more big value than black line.

I want to know why two lines are different exactly.

 

 

 

 

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Answers

  • Rahul Rajan_21763
    Rahul Rajan_21763 New Altair Community Member
    edited February 2019

    The Normal Modes and FRF results match pretty well between the two models.

    The difference in ERP results could be coming from the PANELG definition. We see that, for the contact model you have included all the elements to define PANELG.

    Please re-run the job by considering only the top plate under PANELG card.

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