ERROR ID: 150 NEED HELP

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

Good morning I'm trying to do a simple optimization of a connecting-rod with:

- material: E= 1,2e+11 poisson=0.3

- I have create a point in the centre of the big hole of the connectingrod, all the nodes of the internal surface of the big hole are connected to the central node with RB2 elements, then I have applied to the central points a constraint that constraints all the 6 degrees.

- I have applied a force of 4000N on the internal face of the little hole of the connecting-rod

- I have imposed an optimization constraint on volume with upper bound of 0,5

-The objective function is the minimization of the compliance

When I do the check of the optimization, it return me the error messagge:

ERROR # 150 FROM SUBROUTINE prepopt2

Invalid Volume or Mass Constraint.

The response type is the total VOLUME

the upper bound value = 5.000000E-01

the total volume = 8.761313E+04

the design volume = 7.718574E+04

the total mass = 0.000000E+00

the design mass = 0.000000E+00

***** FATAL OPTIMIZATION ERROR *****

I don't understand if the problem is caused by the properties of the material, the constraints or the force.

Can you suggest me how try to fix the error?

Tagged:

Answers

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited December 2009

    Hi Luisa,

    The error come from the constraint value. Do you create a VOLUME or VOLFRAC response?

    If you want use VOLFRAC response, you can just update the response.

    If you want use VOLUME response, you have to change the constrainte value. 0.5 is too smal compare to the design volume (7.718574E+04).

    Regards,

    Christophe

Categories