When setting up an OptiStruct optimization, it is often useful to be able to define a custom response. A DRESP2 can be used to combine existing responses to formulate an optimization constraint or objective. DRESP2 can be used with standard arguments for DRESP1 cards, such as sum, avg, max, and min. It also can be used with a DEQATN card, which establishes a functional relationship between DRESP1 responses like mass, volume, displacement, or stress. This document gives instructions for setting up this equation in HyperWorks.
Prerequisite: Create DRESP1 responses you need to relate with a function.
The dequations dialog opens up.
In this field, a functional relationship between different DRESP1 responses is established.
DRESP2 3 eq 1
+ DRESP1LV 4 1 ALL 5 1 ALL
+ 6 1 ALL 7 1 ALL
DRESP1 4 node 1x DISP TX 3192
DRESP1 5 node 2x DISP TX 52
DRESP1 6 node 3x DISP TX 2911
DRESP1 7 node 4x DISP TX 42
DEQATN 1 f(a,b,c,d) = a + b + c + d
The responses are linked by the order in which they are referenced in the DRESP2 function and the equation. Next, continue setting up the design optimization by setting any other responses, constraints and an objective.
To learn more about setting up an optimization with OptiStruct and HyperWorks, you can review the product documentation as well as other knowledge located in the Altair Community such as product forums.