I've been messing around with connectors and foundation bolts in static simulation, and was wondering if there was another way to do something similar in random vibration? I know that obviously connectors aren't supported in linear dynamic, but I was wondering if you could just create "landing pads" for the bolt based on the pressure cone of the bolt (seen on page 19 here: http://prod.sandia.gov/techlib/access-control.cgi/2008/080371.pdf ). In doing so, you would end up creating a split face on the bottom of the part and fixing there (diameter is determined using 30deg pressure angle), then creating a similar split face on top and applying clamping force there. While this seems to help solve the issue of artificial stiffness when fixing an entire bottom face of a part, it doesn't constrain motion into the "virtual wall" plane. Just curious if anyone had explored this topic more, and what others do to more accurately simulate a part that is bolted down to a much more rigid baseplate.