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VDisp Abaqus -relation between prescribed return variable(if rval is acceleration) and nodal u,v,a

VDisp Abaqus -relation between prescribed return variable(if rval is acceleration) and nodal u,v,a

VDisp Abaqus -relation between prescribed return variable(if rval is acceleration) and nodal u,v,a

(OP)
Hello Everyone,

I'm working on VDisp to specify acceleration boundary condition on the one of the node sets and I'm confused with few of the variables listed in the Vdisp user sub-routine. My main concern is as listed below:

1)How are spatial displacement(u), spatial velocity(v) and spatial accelerations(a) calculated by abaqus when the prescribed variable for rval is given as acceleration (to put differently, if the type of the associated boundary condition is specified as acceleration, is there any formula/ mathematical expression which abaqus uses to calculate the respective nodal displacement,velocity and acceleration of the node set)?

Any information regarding this would be quite helpful!

Thank you all for your time.

Regards,
PS

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