Array nWhat Array said was apply a force on the large massnHave you done the double integration of the shock acceleration? There are some corrections to do along the way, especially for data recorded from accelerometers. Are you using vibrationdata in matlab? That is very useful. If the acceleration is a specification, then there might not be an issue. If you are willing to attach the shock impulse data or definition, I would be interested to look at it. I have matlab. You can put data in a zip file to attach it.n