🎉Community Raffle - Win $25

An exclusive raffle opportunity for active members like you! Complete your profile, answer questions and get your first accepted badge to enter the raffle.

Join and Win

Error when DRESP1 INERTIA or STRESS in DEQATN used in DESSUB

Altair Forum User

Hi,

By trying to compute the buckling of stiffened panel, I encountered problems.

I have obtained following errors when I have performed a parametric optimization with DRESP1 INERTIA and STRESS in deqatn called by DESSUB. (OptiStruct 12.0.210 )

Here after an extract from the input file which is attached in the totality to this message:

DESOBJ(MIN)=24
SUBCASE 7

SPC =       26
LOAD =       25
DESSUB =       2

...

BEGIN BULK

...
DRESP2 47      R2_1           1
+       DRESP1        27
+       DRESP2        46
DRESP2 46      FE2_1          2
+       DRESP1        25
DRESP1 27      C2_1    STRESS PBEAML             SNMAX               5
DRESP1 25      Ir2_1   INERTIA PBEAML                ZZ               5
DRESP1 24      Mass    MASS
DEQATN 2       F(I)=9.8696*70000*I/530**2/186
DEQATN 1       R(C,F)=F/C
DCONSTR        1      47        1.0
DCONADD        2       1

...

Here, the error codes coming from .out

*** ERROR # 1803 ***
INERTIA responses are not subcase dependent.
DRESP1 ID = 25

*** ERROR # 1810 ***
Number of responses in DRESP2 inconsistent.
DRESP2 ID = 47

This error occurs in module 'dppdrv1'.

I think to have deduced the following fact :

*** ERROR # 1803 *** owing to INERTIA card which seems be compatible with DESGLB but in my case, all the subcases are not concerned by this contraints.

*** ERROR # 1810 *** owing to STRESS response which seems not be detected by optistruct.

Does anyone have a solution or a explanation for this ?

Thank

Unable to find an attachment - read this blog

Find more posts tagged with

English

OptiStruct

Accepted answers

All comments

Rahul Rajan_21763

Please check details about DVPREL1.I have highlighted about PBEAML & DVPREL from user guide.

<?xml version="1.0" encoding="UTF-8"?>

Unable to find an attachment - read this blog

Altair Forum User

Thank for your answer,

But I think the model respects these rules. It runs if we suppress the card DESSUB = 2, which proves that the DVPREL is not involved but the constraints.

Others ideas ?

Rahul Rajan_21763

Thanks for sharing this information.I will check & update you.

Altair Forum User

Hi Morgan,

Looks like Interia response can not be used as a function. Instead, as a workaround, Calculate Moment of Inertia using Summary option in HyperMesh and use this value in creating the response function.

In order to calculate MoI, Retain only the component(s) which you want to use as a part of response. Goto Post Page>> Summary>> Load (Load the file)>> OptiStruct>> Moment_of_Inertia. Click summary which will write MoI for the retained model.

Altair Forum User

Thank to both of you, I will use the DESVAR of the CBEAML in order to compute at each step the inertial moment.