Autodesk Robot Structural Analysis

[#1]

When I calculate my modell i get the following error: instability of type 3 in RX direction

I have looked at the node but everything seems to be correct. I the releases box I have tried to tick off RX, but that did not help.

[#2]

Open calculatin Report , find there Max min values on stiffeness matrix diagonal and write here these two values.

[#3]

Min/Max after decomposition:    7,463808e+006         6,847539e+019

precision: 1 

[#4]

if the difference between these values is greater than 1e11 \ 1e12 program reports instability number 3.

It is related to big differences in stiffenes of elements for example very short elements exist in model = some inaccuracies.

You can check it this way: on dummy model select everything, make intersection, then open Bars table on View tab. Find shortests bars. Then locate nodes \ places on original model and correct location of nodes.

If it is not the case. Send me model. You already know how.

[#5]

I don't understand how to do what you told me to do

[#6]

I'm sending the file

[#7]

Example below

If not - send me the file. 

[#8 · Accepted solution]

Inacurracies in your model: