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hi moderators,

i have set up an experimental system like below in order to study vibration isolation characteristics of a specimen

in this system, there are specimen and a rigid plate of 1 kg was placed on the specimen. there are another rigid plate bottom specimen

the specimen was adhered to both rigid plate

at the bottom, there are electromagnetic shaker in order to give harmonic movement

I have to FE model of the system  I have mterial parameters but there are some error in BC

I m waiting your suggestions


 

 

image.png.2de5eacce1f1fc2da4a209745e36b6a9.pnghi dear admins

 

 

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I have encountered this error ;

*** ERROR # 2985 ***
 Dependent DOF 1 of GRID 87578 cannot be converted to an
 independent DOF with AUTOMSET for this rigid configuration.
 There are not enough constraint equations to reformulate it.
 If RBODY is used in the model, it is getting overconstraint in the model.
 By adding "DEBUG,REMOVRGD,1.", Optistruct would not create constraint
 on the dependend node of RBODY

 

Is there a solution?

 

Best Regards

 

 

image.thumb.png.dcb85578466ce407d3969b9984c5eb3f.png

 

r2.fem

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4 hours ago, Rahul R said:

I see some modelling issues in above shared model..I believe this you corrected and shared in below post.

https://forum.altair.com/topic/37782-h3d-error/

this problem was solved in the topic

On 1/7/2020 at 11:52 PM, durukanbdilek said:

I have encountered this error ;

*** ERROR # 2985 ***
 Dependent DOF 1 of GRID 87578 cannot be converted to an
 independent DOF with AUTOMSET for this rigid configuration.
 There are not enough constraint equations to reformulate it.
 If RBODY is used in the model, it is getting overconstraint in the model.
 By adding "DEBUG,REMOVRGD,1.", Optistruct would not create constraint
 on the dependend node of RBODY

 

Is there a solution?

 

Best Regards

 

 

image.thumb.png.dcb85578466ce407d3969b9984c5eb3f.png

 

r2.fem 12.37 MB · 8 downloads

I cannot solve this problem for vibration isolation 

best regards

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