EricaD
Structural
- May 23, 2013
- 4
Hi
I am trying to combine constraints in a size optimisation in Optistruct. I have tried it in various ways and get similar errors (but no results![[sad]](/data/assets/smilies/sad.gif "[sad] [sad]")
).
i) If I use dequations and normalise the displacement constraint and stress constraint so that they have the same range and then use a 3rd equation to combine them I get the error
number of responses in DRESP2 inconsistent
ii) if I normalise the constraints in Optistruct but then try to send them to HyperMath for constraint aggregation using a DRESP3 card. I get a similar error to the above but for DRESP3.
iii) If I used DRESP2L in the DRESP3 card with each response paired with a suitable subcase I get the error that DRESP3 statement is not referenced above the first subcase, but I don't know what to do with that - all the obvious moving of statements doesn't seem to make any difference.
Anyone got any thoughts? btw I am using Optistruct 11.0
Cheers
I am trying to combine constraints in a size optimisation in Optistruct. I have tried it in various ways and get similar errors (but no results
).i) If I use dequations and normalise the displacement constraint and stress constraint so that they have the same range and then use a 3rd equation to combine them I get the error
number of responses in DRESP2 inconsistent
ii) if I normalise the constraints in Optistruct but then try to send them to HyperMath for constraint aggregation using a DRESP3 card. I get a similar error to the above but for DRESP3.
iii) If I used DRESP2L in the DRESP3 card with each response paired with a suitable subcase I get the error that DRESP3 statement is not referenced above the first subcase, but I don't know what to do with that - all the obvious moving of statements doesn't seem to make any difference.
Anyone got any thoughts? btw I am using Optistruct 11.0
Cheers