Internal Responses

OptiStruct allows the use of numerous structural responses, calculated in a finite element analysis, or combinations of these responses to be used as objective and constraint functions in a structural optimization.

Responses are defined using DRESP1 Bulk Data Entries. Combinations of responses are defined using either DRESP2 entries, which reference an equation defined by a DEQATN Bulk Data Entry, or DRESP3 entries, which make use of user-defined external routines identified by the LOADLIB I/O Options Entry. Responses are either global or subcase (loadstep, load case) related. The character of a response determines whether or not a constraint or objective referencing that particular response needs to be referenced within a subcase.