1 Reply Latest reply on Mar 6, 2017 2:07 PM by Ryan Dark

    Inadequate Fixtures...Suspension FEA Simulation Help

    John Finch

      I'm trying to analyze the suspension of a small buggy built for an SAE collegiate competition (Baja). Unfortunately, there are no instructors at my school that are proficient in SolidWorks to assist me.

       

      My problem is that when running the simulation, I get an error that there may be inadequate fixtures. I have tried rechecking fixtures, using different connection combinations, simplifying the assembly, etc.. About 20+ hours of trying different things. I am now out of ideas. If you please, I would appreciate any help or advice!

       

      I've attached the assembly below.

        • Re: Inadequate Fixtures...Suspension FEA Simulation Help
          Ryan Dark

          Hi John,

          It does appear that your study setup is unstable in some way.  I went through a quick stability diagnosis in a duplicate of your study like this:

           

          1. Go into the study 'Properties'

                    Turn on 'Use soft springs to stabilize model'

                    Turn off 'Compute free body forces'

                    Turn off 'Large displacement mode'

          2. Suppress all loads and apply only gravity

          3. Mesh/Run the study

          4. When the solver stops due to large displacements and prompts to put the study into 'Large Displacement mode' declined this offer.  The solver will dump what results it has so far

          5. Inspect the displacement plot in the results to find the unrestrained body

           

          The results showed one body was not attached to the rest:

          You will want to add some connections/bonds to this body to attach it onto the rest of the model.  Once you have done that you would iterate the stability check to see if other bodies are also detached.