Optimisation for multiple load cases

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

Hi guys

 

I am a relatively new user to Optistruct. I have so far been successful in creating valid models, which have given good designs for simple load cases, but I am now looking to push this forward and apply it to some real-world stuff.

 

I have a component which has to pass multiple different tests to meet its design criteria.

 

It should never have to endure them all at once and even my pre-optimisation model will not withstand them all at once. Could anyone tell me how I can get Optistruct to create some geometry which satisfies multiple loadcases individually. 

 

By way of an example, something along the lines of a cantilever beam which is optimised for a weight on its own or a lateral load on its own, but not both at the same time?

 

Any help would be good.

 

Thanks

 

Rob

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Answers

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited December 2013

    Hi,

     

    it depends on the type of response and objective. There are subcase independent and subcase dependent responses.

    Take a look at:

     

    file:///C:/Program%20Files/Altair/12.0/help/hwsolvers/hwsolvers.htm

    ->Altair OptiStruct > User's Guide > Design Optimization > Responses:

     

     

    Subcase Independent:

    • Mass and Volume
    • Fraction of Mass and Fraction of Design Volume
    • Center of Gravity
    • Moments of Inertia
    • Weighted Compliance
    • Weighted Reciprocal Eigenvalue (Frequency)
    • Combined Compliance Index
    • Von Mises Stress in a Topology or Free-Size Optimization
    • Bead Discreteness Fraction

     

    Subcase Dependent:

    • Static Compliance
    • Static Displacement
    • Static Stress of Homogeneous Material
    • Static Strain of Homogeneous Material
    • Static Stress of Composite Lay-up
    • Static Strain of Composite Lay-up
    • Static Failure in a Composite Lay-up
    • Static Force
    • Single Point Force at a constrained grid point
    • Grid Point Force
    • Temperature
    • Buckling Factor
    • .... and more

     

    You can pick the subcases in subcase dependent responses/objectiv.

     

    Regards,

    Mario

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