HyperMesh 2019 - Represent a fixed constraint that moves upon an acceleration load

MaL2K16
MaL2K16 Altair Community Member
edited October 2020 in Community Q&A

Hello,

 

I am running into a problem with a modal transient dynamic analysis: I am simulating a tower that is fixed-connected to a structural shake table, where the shake table is subject to an acceleration load...and I can't run the analysis.

 

My excitation and SPCs are coincident - this is the problem, but I can't figure out how to simulate a fixed constraint that is moving - the tower is fixed-connected to the base plate, and the base plate is excited by the acceleration load. The acceleration load gets transferred to the rest of the tower:

 

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<?xml version="1.0" encoding="UTF-8"?>1516923998_DesignTower2ExcitationatBottomNodes.thumb.PNG.f7397de0a3e78f58720f8d9f4c79284b.PNG

 

 

<?xml version="1.0" encoding="UTF-8"?>824867400_DesignTower2SPCatBottomNodes.thumb.PNG.f697b1de4da3161067f82281f7ec09cc.PNG

 

Does anybody know how to model this scenario correctly in HyperMesh or know how to tell HyperMesh to transfer the acceleration load from the base plate to the rest of the tower? I have gone through the modal transient dynamic analysis and have everything else set up - its just the excitation and SPC. The tutorial presented an example where the excitation and the SPCs were not at the same location. Thanks again for your help!

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