Hi @mcw0 . Welcome to Fusion.
The Simulation environment does not have a spring element. That is normally how springs are added to an analysis where the spring rate is a numerical input. Without that element types, you would need to physically model the spring which is not a very efficient method.
Another potential issue is what type of analysis do you want to perform? "Suspensions" and "damping" typically imply some type of vibration or dynamic analysis. Fusion does not have analysis types such as random vibration and frequency response which would normally be used for those types of designs. (Fusion does have the event simulation, but that is not designed to handle the typical vibration problem.) If your problem is static, then the static stress or nonlinear static stress may be suitable for your analysis.
Please feel free to provide more details about what you trying to simulate and what effects you are including.
John Holtz, P.E. Global Product Support
Autodesk, Inc. If not provided, indicate the version of Inventor Nastran you are using.If the issue is related to a model, attach the model! See What files to provide when the model is needed.
