Hi, I have a simple question to ask: What is the Eigenfrequency mean in vibration? I am confused and can anyone here explain to me or provide me some useful link? I am trying to use comsol to analyse the vibration frequency from a plate, which was mount on top of 4 camshafts. These camshafts will rotate and hence the plate sitting on top will vibrate. If anyone is familiar with comsol, Pls help me by teaching me which mode i should use. Many Thanks.