OptiStruct ignores the settings of NLPARM

cfuser

Dear all,

I have convergence problems with a model I am analysing with OptiStruct. I have set EPSU and EPSP to 0.01 both in NLPARM (see screen shot input). But the solver seems to ignore those tolerances and keeps reducing the incerement size until it errors out (see screen shot output) as my minimum increment size DTMIN is set to 0.0001 in NLADAPT (see screen shot input). Can somebody give me an advice on what I could do to solve this issue?

 

Cheers!

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

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

Rahul Rajan_21763

Can you first try with PARAM LGDISP 1 

If it error out then,try with PARAM EXPERTNL with & without CNTSTB .

 

Note:It is not generally recommended to change the default values. Varying the tolerances or excluding criteria may help achieve a solution, but will affect the result accuracy.