Hello
I have a problem with my static analysis.
The error returns that the model is unstable and that the imposed displacements are not adequate.
In the attached image I have schematically represented the study. The green arrows represent the fixed areas.
I tried the fixed, immobile and plane support geometries in vain. I also tried to stabilize the assembly with other compositions made fixed.
Do you have any advice on the definition of imposed travel?
Thank you in advance.
https://forum.solidworks.com/thread/95179
Hello
Are these movements or imposed efforts?
otherwise, you may have to check that there is not a unit error or other (e.g. force in N instead of kg, young's modulus in MPa instead of GPa). When the calculated displacements become very important in relation to the geometry of the part, it tends to cause the software to bug.
@Chamade: The forces are represented by the blue arrows.
Imposed travel is shown in green.
The forces are indeed in Newton and the Young's moduli are managed by materials
@PL: All parts are fixed. The imposed movements serve precisely to define the degrees of freedom of the pieces. I must definitely use them incorrectly. That's why I want to have advice.
Thank you.
Hello. For my part, I don't understand the system, let me explain:
According to what you wrote "the green arrows represent the fixed areas.". So we do have fixed recessed connections in these places?
Are you talking about imposed displacement, that is to say that there are efforts in these places?
There is a lack of effort, because according to the P.F.S., the sum of the forces cannot be equal to 0 (the forces are in the same direction).
Are you sure of the direction of the green arrows on the left?
[Edit]: Is the Imposed Displacement Type set to Fixed Geometry?
[Edit source]: http://www.solidworks.fr/sw/images/content/Training/SolidWorks_Simulation_Student_Guide_FRA.pdf
Do you agree with this simplified system?
@Aurelien: Actually force 2 and reversed.
And are you looking for the reaction to the supports or the deformation of the part?
[edit] Spelling
I try to validate the assembly by analyzing its deformation.
Hello
Are the connections between rooms well defined?
@+
@Coyote: I left the global contact as the default.
Thank you.
Re
Overall contact may not be enough in your case, e.g. if two rooms are not really in physical contact.
Can you send us your file or impossible?
@+
A question: What if I transform my assembly into a part and merge the bodies?
For sending, I'll see what I can do.
Thank you.
Re
In view of your image, aren't there too many small parts that are not used for the calculation and therefore lead to errors in the simulation?
@+
In fact, the image is greatly simplified for privacy reasons.
I'm going to do some tests...
Thank you for these answers that make me move forward...
I do think that we need to make as many parts of the system as possible interconnected in order to eliminate the addition of unstudied constraints. I tried to symbolize this in my previous diagram by representing the whole system by a black beam with all the branches interconnected.
Thank you all.
Especially to Coyote and Aurélien Fives for helping me in my reflection.
I finally recorded the assembly in pieces and combined the bodies.
See you.